Merge remote-tracking branch 'upstream/master' into userreguserreg

1 files changed, 10689 insertions, 0 deletions

diff --git a/runtime/lua/vim/_meta/vimfn.lua b/runtime/lua/vim/_meta/vimfn.lua
new file mode 100644
index 0000000000..05e5b2b871
--- /dev/null
+++ b/runtime/lua/vim/_meta/vimfn.lua
@@ -0,0 +1,10689 @@
+--- @meta _
+-- THIS FILE IS GENERATED
+-- DO NOT EDIT
+error('Cannot require a meta file')
+
+--- Return the absolute value of {expr}.  When {expr} evaluates to
+--- a |Float| abs() returns a |Float|.  When {expr} can be
+--- converted to a |Number| abs() returns a |Number|.  Otherwise
+--- abs() gives an error message and returns -1.
+--- Examples: >vim
+---   echo abs(1.456)
+--- <  1.456  >vim
+---   echo abs(-5.456)
+--- <  5.456  >vim
+---   echo abs(-4)
+--- <  4
+---
+--- @param expr any
+--- @return number
+function vim.fn.abs(expr) end
+
+--- Return the arc cosine of {expr} measured in radians, as a
+--- |Float| in the range of [0, pi].
+--- {expr} must evaluate to a |Float| or a |Number| in the range
+--- [-1, 1].
+--- Returns NaN if {expr} is outside the range [-1, 1].  Returns
+--- 0.0 if {expr} is not a |Float| or a |Number|.
+--- Examples: >vim
+---   echo acos(0)
+--- <  1.570796 >vim
+---   echo acos(-0.5)
+--- <  2.094395
+---
+--- @param expr any
+--- @return number
+function vim.fn.acos(expr) end
+
+--- Append the item {expr} to |List| or |Blob| {object}.  Returns
+--- the resulting |List| or |Blob|.  Examples: >vim
+---   let alist = add([1, 2, 3], item)
+---   call add(mylist, "woodstock")
+--- <Note that when {expr} is a |List| it is appended as a single
+--- item.  Use |extend()| to concatenate |Lists|.
+--- When {object} is a |Blob| then {expr} must be a number.
+--- Use |insert()| to add an item at another position.
+--- Returns 1 if {object} is not a |List| or a |Blob|.
+---
+--- @param object any
+--- @param expr any
+--- @return any
+function vim.fn.add(object, expr) end
+
+--- Bitwise AND on the two arguments.  The arguments are converted
+--- to a number.  A List, Dict or Float argument causes an error.
+--- Also see `or()` and `xor()`.
+--- Example: >vim
+---   let flag = and(bits, 0x80)
+--- <
+---
+--- @param expr any
+--- @param expr1 any
+--- @return integer
+vim.fn['and'] = function(expr, expr1) end
+
+--- Returns Dictionary of |api-metadata|.
+---
+--- View it in a nice human-readable format: >vim
+---        lua vim.print(vim.fn.api_info())
+--- <
+---
+--- @return table
+function vim.fn.api_info() end
+
+--- When {text} is a |List|: Append each item of the |List| as a
+--- text line below line {lnum} in the current buffer.
+--- Otherwise append {text} as one text line below line {lnum} in
+--- the current buffer.
+--- Any type of item is accepted and converted to a String.
+--- {lnum} can be zero to insert a line before the first one.
+--- {lnum} is used like with |getline()|.
+--- Returns 1 for failure ({lnum} out of range or out of memory),
+--- 0 for success.  When {text} is an empty list zero is returned,
+--- no matter the value of {lnum}.  Example: >vim
+---   let failed = append(line('$'), "# THE END")
+---   let failed = append(0, ["Chapter 1", "the beginning"])
+--- <
+---
+--- @param lnum integer
+--- @param text any
+--- @return 0|1
+function vim.fn.append(lnum, text) end
+
+--- Like |append()| but append the text in buffer {expr}.
+---
+--- This function works only for loaded buffers. First call
+--- |bufload()| if needed.
+---
+--- For the use of {buf}, see |bufname()|.
+---
+--- {lnum} is the line number to append below.  Note that using
+--- |line()| would use the current buffer, not the one appending
+--- to.  Use "$" to append at the end of the buffer.  Other string
+--- values are not supported.
+---
+--- On success 0 is returned, on failure 1 is returned.
+---
+--- If {buf} is not a valid buffer or {lnum} is not valid, an
+--- error message is given. Example: >vim
+---   let failed = appendbufline(13, 0, "# THE START")
+--- <However, when {text} is an empty list then no error is given
+--- for an invalid {lnum}, since {lnum} isn't actually used.
+---
+--- @param buf any
+--- @param lnum integer
+--- @param text string
+--- @return 0|1
+function vim.fn.appendbufline(buf, lnum, text) end
+
+--- The result is the number of files in the argument list.  See
+--- |arglist|.
+--- If {winid} is not supplied, the argument list of the current
+--- window is used.
+--- If {winid} is -1, the global argument list is used.
+--- Otherwise {winid} specifies the window of which the argument
+--- list is used: either the window number or the window ID.
+--- Returns -1 if the {winid} argument is invalid.
+---
+--- @param winid? integer
+--- @return integer
+function vim.fn.argc(winid) end
+
+--- The result is the current index in the argument list.  0 is
+--- the first file.  argc() - 1 is the last one.  See |arglist|.
+---
+--- @return integer
+function vim.fn.argidx() end
+
+--- Return the argument list ID.  This is a number which
+--- identifies the argument list being used.  Zero is used for the
+--- global argument list.  See |arglist|.
+--- Returns -1 if the arguments are invalid.
+---
+--- Without arguments use the current window.
+--- With {winnr} only use this window in the current tab page.
+--- With {winnr} and {tabnr} use the window in the specified tab
+--- page.
+--- {winnr} can be the window number or the |window-ID|.
+---
+--- @param winnr? integer
+--- @param tabnr? integer
+--- @return integer
+function vim.fn.arglistid(winnr, tabnr) end
+
+--- The result is the {nr}th file in the argument list.  See
+--- |arglist|.  "argv(0)" is the first one.  Example: >vim
+---   let i = 0
+---   while i < argc()
+---     let f = escape(fnameescape(argv(i)), '.')
+---     exe 'amenu Arg.' .. f .. ' :e ' .. f .. '<CR>'
+---     let i = i + 1
+---   endwhile
+--- <Without the {nr} argument, or when {nr} is -1, a |List| with
+--- the whole |arglist| is returned.
+---
+--- The {winid} argument specifies the window ID, see |argc()|.
+--- For the Vim command line arguments see |v:argv|.
+---
+--- Returns an empty string if {nr}th argument is not present in
+--- the argument list.  Returns an empty List if the {winid}
+--- argument is invalid.
+---
+--- @param nr? integer
+--- @param winid? integer
+--- @return string|string[]
+function vim.fn.argv(nr, winid) end
+
+--- Return the arc sine of {expr} measured in radians, as a |Float|
+--- in the range of [-pi/2, pi/2].
+--- {expr} must evaluate to a |Float| or a |Number| in the range
+--- [-1, 1].
+--- Returns NaN if {expr} is outside the range [-1, 1].  Returns
+--- 0.0 if {expr} is not a |Float| or a |Number|.
+--- Examples: >vim
+---   echo asin(0.8)
+--- <  0.927295 >vim
+---   echo asin(-0.5)
+--- <  -0.523599
+---
+--- @param expr any
+--- @return number
+function vim.fn.asin(expr) end
+
+--- Run {cmd} and add an error message to |v:errors| if it does
+--- NOT produce a beep or visual bell.
+--- Also see |assert_fails()|, |assert_nobeep()| and
+--- |assert-return|.
+---
+--- @param cmd any
+--- @return 0|1
+function vim.fn.assert_beeps(cmd) end
+
+--- When {expected} and {actual} are not equal an error message is
+--- added to |v:errors| and 1 is returned.  Otherwise zero is
+--- returned. |assert-return|
+--- The error is in the form "Expected {expected} but got
+--- {actual}".  When {msg} is present it is prefixed to that.
+---
+--- There is no automatic conversion, the String "4" is different
+--- from the Number 4.  And the number 4 is different from the
+--- Float 4.0.  The value of 'ignorecase' is not used here, case
+--- always matters.
+--- Example: >vim
+---   assert_equal('foo', 'bar')
+--- <Will result in a string to be added to |v:errors|:
+---   test.vim line 12: Expected 'foo' but got 'bar' ~
+---
+--- @param expected any
+--- @param actual any
+--- @param msg? any
+--- @return 0|1
+function vim.fn.assert_equal(expected, actual, msg) end
+
+--- When the files {fname-one} and {fname-two} do not contain
+--- exactly the same text an error message is added to |v:errors|.
+--- Also see |assert-return|.
+--- When {fname-one} or {fname-two} does not exist the error will
+--- mention that.
+---
+--- @return 0|1
+function vim.fn.assert_equalfile() end
+
+--- When v:exception does not contain the string {error} an error
+--- message is added to |v:errors|.  Also see |assert-return|.
+--- This can be used to assert that a command throws an exception.
+--- Using the error number, followed by a colon, avoids problems
+--- with translations: >vim
+---   try
+---     commandthatfails
+---     call assert_false(1, 'command should have failed')
+---   catch
+---     call assert_exception('E492:')
+---   endtry
+--- <
+---
+--- @param error any
+--- @param msg? any
+--- @return 0|1
+function vim.fn.assert_exception(error, msg) end
+
+--- Run {cmd} and add an error message to |v:errors| if it does
+--- NOT produce an error or when {error} is not found in the
+--- error message.  Also see |assert-return|.
+---
+--- When {error} is a string it must be found literally in the
+--- first reported error. Most often this will be the error code,
+--- including the colon, e.g. "E123:". >vim
+---   assert_fails('bad cmd', 'E987:')
+--- <
+--- When {error} is a |List| with one or two strings, these are
+--- used as patterns.  The first pattern is matched against the
+--- first reported error: >vim
+---   assert_fails('cmd', ['E987:.*expected bool'])
+--- <The second pattern, if present, is matched against the last
+--- reported error.  To only match the last error use an empty
+--- string for the first error: >vim
+---   assert_fails('cmd', ['', 'E987:'])
+--- <
+--- If {msg} is empty then it is not used.  Do this to get the
+--- default message when passing the {lnum} argument.
+---
+--- When {lnum} is present and not negative, and the {error}
+--- argument is present and matches, then this is compared with
+--- the line number at which the error was reported. That can be
+--- the line number in a function or in a script.
+---
+--- When {context} is present it is used as a pattern and matched
+--- against the context (script name or function name) where
+--- {lnum} is located in.
+---
+--- Note that beeping is not considered an error, and some failing
+--- commands only beep.  Use |assert_beeps()| for those.
+---
+--- @param cmd any
+--- @param error? any
+--- @param msg? any
+--- @param lnum? integer
+--- @param context? any
+--- @return 0|1
+function vim.fn.assert_fails(cmd, error, msg, lnum, context) end
+
+--- When {actual} is not false an error message is added to
+--- |v:errors|, like with |assert_equal()|.
+--- The error is in the form "Expected False but got {actual}".
+--- When {msg} is present it is prepended to that.
+--- Also see |assert-return|.
+---
+--- A value is false when it is zero. When {actual} is not a
+--- number the assert fails.
+---
+--- @param actual any
+--- @param msg? any
+--- @return 0|1
+function vim.fn.assert_false(actual, msg) end
+
+--- This asserts number and |Float| values.  When {actual}  is lower
+--- than {lower} or higher than {upper} an error message is added
+--- to |v:errors|.  Also see |assert-return|.
+--- The error is in the form "Expected range {lower} - {upper},
+--- but got {actual}".  When {msg} is present it is prefixed to
+--- that.
+---
+--- @param lower any
+--- @param upper any
+--- @param actual any
+--- @param msg? any
+--- @return 0|1
+function vim.fn.assert_inrange(lower, upper, actual, msg) end
+
+--- When {pattern} does not match {actual} an error message is
+--- added to |v:errors|.  Also see |assert-return|.
+--- The error is in the form "Pattern {pattern} does not match
+--- {actual}".  When {msg} is present it is prefixed to that.
+---
+--- {pattern} is used as with |expr-=~|: The matching is always done
+--- like 'magic' was set and 'cpoptions' is empty, no matter what
+--- the actual value of 'magic' or 'cpoptions' is.
+---
+--- {actual} is used as a string, automatic conversion applies.
+--- Use "^" and "$" to match with the start and end of the text.
+--- Use both to match the whole text.
+---
+--- Example: >vim
+---   assert_match('^f.*o$', 'foobar')
+--- <Will result in a string to be added to |v:errors|:
+---   test.vim line 12: Pattern '^f.*o$' does not match 'foobar' ~
+---
+--- @param pattern any
+--- @param actual any
+--- @param msg? any
+--- @return 0|1
+function vim.fn.assert_match(pattern, actual, msg) end
+
+--- Run {cmd} and add an error message to |v:errors| if it
+--- produces a beep or visual bell.
+--- Also see |assert_beeps()|.
+---
+--- @param cmd any
+--- @return 0|1
+function vim.fn.assert_nobeep(cmd) end
+
+--- The opposite of `assert_equal()`: add an error message to
+--- |v:errors| when {expected} and {actual} are equal.
+--- Also see |assert-return|.
+---
+--- @param expected any
+--- @param actual any
+--- @param msg? any
+--- @return 0|1
+function vim.fn.assert_notequal(expected, actual, msg) end
+
+--- The opposite of `assert_match()`: add an error message to
+--- |v:errors| when {pattern} matches {actual}.
+--- Also see |assert-return|.
+---
+--- @param pattern any
+--- @param actual any
+--- @param msg? any
+--- @return 0|1
+function vim.fn.assert_notmatch(pattern, actual, msg) end
+
+--- Report a test failure directly, using String {msg}.
+--- Always returns one.
+---
+--- @param msg any
+--- @return 0|1
+function vim.fn.assert_report(msg) end
+
+--- When {actual} is not true an error message is added to
+--- |v:errors|, like with |assert_equal()|.
+--- Also see |assert-return|.
+--- A value is |TRUE| when it is a non-zero number or |v:true|.
+--- When {actual} is not a number or |v:true| the assert fails.
+--- When {msg} is given it precedes the default message.
+---
+--- @param actual any
+--- @param msg? any
+--- @return 0|1
+function vim.fn.assert_true(actual, msg) end
+
+--- Return the principal value of the arc tangent of {expr}, in
+--- the range [-pi/2, +pi/2] radians, as a |Float|.
+--- {expr} must evaluate to a |Float| or a |Number|.
+--- Returns 0.0 if {expr} is not a |Float| or a |Number|.
+--- Examples: >vim
+---   echo atan(100)
+--- <  1.560797 >vim
+---   echo atan(-4.01)
+--- <  -1.326405
+---
+--- @param expr any
+--- @return number
+function vim.fn.atan(expr) end
+
+--- Return the arc tangent of {expr1} / {expr2}, measured in
+--- radians, as a |Float| in the range [-pi, pi].
+--- {expr1} and {expr2} must evaluate to a |Float| or a |Number|.
+--- Returns 0.0 if {expr1} or {expr2} is not a |Float| or a
+--- |Number|.
+--- Examples: >vim
+---   echo atan2(-1, 1)
+--- <  -0.785398 >vim
+---   echo atan2(1, -1)
+--- <  2.356194
+---
+--- @param expr1 any
+--- @param expr2 any
+--- @return number
+function vim.fn.atan2(expr1, expr2) end
+
+--- Return a List containing the number value of each byte in Blob
+--- {blob}.  Examples: >vim
+---   blob2list(0z0102.0304)  " returns [1, 2, 3, 4]
+---   blob2list(0z)    " returns []
+--- <Returns an empty List on error.  |list2blob()| does the
+--- opposite.
+---
+--- @param blob any
+--- @return any[]
+function vim.fn.blob2list(blob) end
+
+--- Put up a file requester.  This only works when "has("browse")"
+--- returns |TRUE| (only in some GUI versions).
+--- The input fields are:
+---     {save}  when |TRUE|, select file to write
+---     {title}  title for the requester
+---     {initdir}  directory to start browsing in
+---     {default}  default file name
+--- An empty string is returned when the "Cancel" button is hit,
+--- something went wrong, or browsing is not possible.
+---
+--- @param save any
+--- @param title any
+--- @param initdir any
+--- @param default any
+--- @return 0|1
+function vim.fn.browse(save, title, initdir, default) end
+
+--- Put up a directory requester.  This only works when
+--- "has("browse")" returns |TRUE| (only in some GUI versions).
+--- On systems where a directory browser is not supported a file
+--- browser is used.  In that case: select a file in the directory
+--- to be used.
+--- The input fields are:
+---     {title}  title for the requester
+---     {initdir}  directory to start browsing in
+--- When the "Cancel" button is hit, something went wrong, or
+--- browsing is not possible, an empty string is returned.
+---
+--- @param title any
+--- @param initdir any
+--- @return 0|1
+function vim.fn.browsedir(title, initdir) end
+
+--- Add a buffer to the buffer list with name {name} (must be a
+--- String).
+--- If a buffer for file {name} already exists, return that buffer
+--- number.  Otherwise return the buffer number of the newly
+--- created buffer.  When {name} is an empty string then a new
+--- buffer is always created.
+--- The buffer will not have 'buflisted' set and not be loaded
+--- yet.  To add some text to the buffer use this: >vim
+---   let bufnr = bufadd('someName')
+---   call bufload(bufnr)
+---   call setbufline(bufnr, 1, ['some', 'text'])
+--- <Returns 0 on error.
+---
+--- @param name string
+--- @return integer
+function vim.fn.bufadd(name) end
+
+--- The result is a Number, which is |TRUE| if a buffer called
+--- {buf} exists.
+--- If the {buf} argument is a number, buffer numbers are used.
+--- Number zero is the alternate buffer for the current window.
+---
+--- If the {buf} argument is a string it must match a buffer name
+--- exactly.  The name can be:
+--- - Relative to the current directory.
+--- - A full path.
+--- - The name of a buffer with 'buftype' set to "nofile".
+--- - A URL name.
+--- Unlisted buffers will be found.
+--- Note that help files are listed by their short name in the
+--- output of |:buffers|, but bufexists() requires using their
+--- long name to be able to find them.
+--- bufexists() may report a buffer exists, but to use the name
+--- with a |:buffer| command you may need to use |expand()|.  Esp
+--- for MS-Windows 8.3 names in the form "c:\DOCUME~1"
+--- Use "bufexists(0)" to test for the existence of an alternate
+--- file name.
+---
+--- @param buf any
+--- @return 0|1
+function vim.fn.bufexists(buf) end
+
+--- @deprecated
+--- Obsolete name for |bufexists()|.
+---
+--- @param ... any
+--- @return 0|1
+function vim.fn.buffer_exists(...) end
+
+--- @deprecated
+--- Obsolete name for |bufname()|.
+---
+--- @param ... any
+--- @return string
+function vim.fn.buffer_name(...) end
+
+--- @deprecated
+--- Obsolete name for |bufnr()|.
+---
+--- @param ... any
+--- @return integer
+function vim.fn.buffer_number(...) end
+
+--- The result is a Number, which is |TRUE| if a buffer called
+--- {buf} exists and is listed (has the 'buflisted' option set).
+--- The {buf} argument is used like with |bufexists()|.
+---
+--- @param buf any
+--- @return 0|1
+function vim.fn.buflisted(buf) end
+
+--- Ensure the buffer {buf} is loaded.  When the buffer name
+--- refers to an existing file then the file is read.  Otherwise
+--- the buffer will be empty.  If the buffer was already loaded
+--- then there is no change.  If the buffer is not related to a
+--- file then no file is read (e.g., when 'buftype' is "nofile").
+--- If there is an existing swap file for the file of the buffer,
+--- there will be no dialog, the buffer will be loaded anyway.
+--- The {buf} argument is used like with |bufexists()|.
+---
+--- @param buf any
+function vim.fn.bufload(buf) end
+
+--- The result is a Number, which is |TRUE| if a buffer called
+--- {buf} exists and is loaded (shown in a window or hidden).
+--- The {buf} argument is used like with |bufexists()|.
+---
+--- @param buf any
+--- @return 0|1
+function vim.fn.bufloaded(buf) end
+
+--- The result is the name of a buffer.  Mostly as it is displayed
+--- by the `:ls` command, but not using special names such as
+--- "[No Name]".
+--- If {buf} is omitted the current buffer is used.
+--- If {buf} is a Number, that buffer number's name is given.
+--- Number zero is the alternate buffer for the current window.
+--- If {buf} is a String, it is used as a |file-pattern| to match
+--- with the buffer names.  This is always done like 'magic' is
+--- set and 'cpoptions' is empty.  When there is more than one
+--- match an empty string is returned.
+--- "" or "%" can be used for the current buffer, "#" for the
+--- alternate buffer.
+--- A full match is preferred, otherwise a match at the start, end
+--- or middle of the buffer name is accepted.  If you only want a
+--- full match then put "^" at the start and "$" at the end of the
+--- pattern.
+--- Listed buffers are found first.  If there is a single match
+--- with a listed buffer, that one is returned.  Next unlisted
+--- buffers are searched for.
+--- If the {buf} is a String, but you want to use it as a buffer
+--- number, force it to be a Number by adding zero to it: >vim
+---   echo bufname("3" + 0)
+--- <If the buffer doesn't exist, or doesn't have a name, an empty
+--- string is returned. >vim
+---   echo bufname("#")  " alternate buffer name
+---   echo bufname(3)    " name of buffer 3
+---   echo bufname("%")  " name of current buffer
+---   echo bufname("file2")  " name of buffer where "file2" matches.
+--- <
+---
+--- @param buf? any
+--- @return string
+function vim.fn.bufname(buf) end
+
+--- The result is the number of a buffer, as it is displayed by
+--- the `:ls` command.  For the use of {buf}, see |bufname()|
+--- above.
+--- If the buffer doesn't exist, -1 is returned.  Or, if the
+--- {create} argument is present and TRUE, a new, unlisted,
+--- buffer is created and its number is returned.
+--- bufnr("$") is the last buffer: >vim
+---   let last_buffer = bufnr("$")
+--- <The result is a Number, which is the highest buffer number
+--- of existing buffers.  Note that not all buffers with a smaller
+--- number necessarily exist, because ":bwipeout" may have removed
+--- them.  Use bufexists() to test for the existence of a buffer.
+---
+--- @param buf? any
+--- @param create? any
+--- @return integer
+function vim.fn.bufnr(buf, create) end
+
+--- The result is a Number, which is the |window-ID| of the first
+--- window associated with buffer {buf}.  For the use of {buf},
+--- see |bufname()| above.  If buffer {buf} doesn't exist or
+--- there is no such window, -1 is returned.  Example: >vim
+---
+---   echo "A window containing buffer 1 is " .. (bufwinid(1))
+--- <
+--- Only deals with the current tab page.  See |win_findbuf()| for
+--- finding more.
+---
+--- @param buf any
+--- @return integer
+function vim.fn.bufwinid(buf) end
+
+--- Like |bufwinid()| but return the window number instead of the
+--- |window-ID|.
+--- If buffer {buf} doesn't exist or there is no such window, -1
+--- is returned.  Example: >vim
+---
+---   echo "A window containing buffer 1 is " .. (bufwinnr(1))
+---
+--- <The number can be used with |CTRL-W_w| and ":wincmd w"
+--- |:wincmd|.
+---
+--- @param buf any
+--- @return integer
+function vim.fn.bufwinnr(buf) end
+
+--- Return the line number that contains the character at byte
+--- count {byte} in the current buffer.  This includes the
+--- end-of-line character, depending on the 'fileformat' option
+--- for the current buffer.  The first character has byte count
+--- one.
+--- Also see |line2byte()|, |go| and |:goto|.
+---
+--- Returns -1 if the {byte} value is invalid.
+---
+--- @param byte any
+--- @return integer
+function vim.fn.byte2line(byte) end
+
+--- Return byte index of the {nr}th character in the String
+--- {expr}.  Use zero for the first character, it then returns
+--- zero.
+--- If there are no multibyte characters the returned value is
+--- equal to {nr}.
+--- Composing characters are not counted separately, their byte
+--- length is added to the preceding base character.  See
+--- |byteidxcomp()| below for counting composing characters
+--- separately.
+--- When {utf16} is present and TRUE, {nr} is used as the UTF-16
+--- index in the String {expr} instead of as the character index.
+--- The UTF-16 index is the index in the string when it is encoded
+--- with 16-bit words.  If the specified UTF-16 index is in the
+--- middle of a character (e.g. in a 4-byte character), then the
+--- byte index of the first byte in the character is returned.
+--- Refer to |string-offset-encoding| for more information.
+--- Example : >vim
+---   echo matchstr(str, ".", byteidx(str, 3))
+--- <will display the fourth character.  Another way to do the
+--- same: >vim
+---   let s = strpart(str, byteidx(str, 3))
+---   echo strpart(s, 0, byteidx(s, 1))
+--- <Also see |strgetchar()| and |strcharpart()|.
+---
+--- If there are less than {nr} characters -1 is returned.
+--- If there are exactly {nr} characters the length of the string
+--- in bytes is returned.
+--- See |charidx()| and |utf16idx()| for getting the character and
+--- UTF-16 index respectively from the byte index.
+--- Examples: >vim
+---   echo byteidx('a😊😊', 2)  " returns 5
+---   echo byteidx('a😊😊', 2, 1)  " returns 1
+---   echo byteidx('a😊😊', 3, 1)  " returns 5
+--- <
+---
+--- @param expr any
+--- @param nr integer
+--- @param utf16? any
+--- @return integer
+function vim.fn.byteidx(expr, nr, utf16) end
+
+--- Like byteidx(), except that a composing character is counted
+--- as a separate character.  Example: >vim
+---   let s = 'e' .. nr2char(0x301)
+---   echo byteidx(s, 1)
+---   echo byteidxcomp(s, 1)
+---   echo byteidxcomp(s, 2)
+--- <The first and third echo result in 3 ('e' plus composing
+--- character is 3 bytes), the second echo results in 1 ('e' is
+--- one byte).
+---
+--- @param expr any
+--- @param nr integer
+--- @param utf16? any
+--- @return integer
+function vim.fn.byteidxcomp(expr, nr, utf16) end
+
+--- Call function {func} with the items in |List| {arglist} as
+--- arguments.
+--- {func} can either be a |Funcref| or the name of a function.
+--- a:firstline and a:lastline are set to the cursor line.
+--- Returns the return value of the called function.
+--- {dict} is for functions with the "dict" attribute.  It will be
+--- used to set the local variable "self". |Dictionary-function|
+---
+--- @param func any
+--- @param arglist any
+--- @param dict? any
+--- @return any
+function vim.fn.call(func, arglist, dict) end
+
+--- Return the smallest integral value greater than or equal to
+--- {expr} as a |Float| (round up).
+--- {expr} must evaluate to a |Float| or a |Number|.
+--- Examples: >vim
+---   echo ceil(1.456)
+--- <  2.0  >vim
+---   echo ceil(-5.456)
+--- <  -5.0  >vim
+---   echo ceil(4.0)
+--- <  4.0
+---
+--- Returns 0.0 if {expr} is not a |Float| or a |Number|.
+---
+--- @param expr any
+--- @return number
+function vim.fn.ceil(expr) end
+
+--- Close a channel or a specific stream associated with it.
+--- For a job, {stream} can be one of "stdin", "stdout",
+--- "stderr" or "rpc" (closes stdin/stdout for a job started
+--- with `"rpc":v:true`) If {stream} is omitted, all streams
+--- are closed. If the channel is a pty, this will then close the
+--- pty master, sending SIGHUP to the job process.
+--- For a socket, there is only one stream, and {stream} should be
+--- omitted.
+---
+--- @param id any
+--- @param stream? any
+--- @return 0|1
+function vim.fn.chanclose(id, stream) end
+
+--- Return the number of the most recent change.  This is the same
+--- number as what is displayed with |:undolist| and can be used
+--- with the |:undo| command.
+--- When a change was made it is the number of that change.  After
+--- redo it is the number of the redone change.  After undo it is
+--- one less than the number of the undone change.
+--- Returns 0 if the undo list is empty.
+---
+--- @return integer
+function vim.fn.changenr() end
+
+--- Send data to channel {id}. For a job, it writes it to the
+--- stdin of the process. For the stdio channel |channel-stdio|,
+--- it writes to Nvim's stdout.  Returns the number of bytes
+--- written if the write succeeded, 0 otherwise.
+--- See |channel-bytes| for more information.
+---
+--- {data} may be a string, string convertible, |Blob|, or a list.
+--- If {data} is a list, the items will be joined by newlines; any
+--- newlines in an item will be sent as NUL. To send a final
+--- newline, include a final empty string. Example: >vim
+---   call chansend(id, ["abc", "123\n456", ""])
+--- <will send "abc<NL>123<NUL>456<NL>".
+---
+--- chansend() writes raw data, not RPC messages.  If the channel
+--- was created with `"rpc":v:true` then the channel expects RPC
+--- messages, use |rpcnotify()| and |rpcrequest()| instead.
+---
+--- @param id any
+--- @param data any
+--- @return 0|1
+function vim.fn.chansend(id, data) end
+
+--- Return Number value of the first char in {string}.
+--- Examples: >vim
+---   echo char2nr(" ")  " returns 32
+---   echo char2nr("ABC")  " returns 65
+---   echo char2nr("á")  " returns 225
+---   echo char2nr("á"[0])  " returns 195
+---   echo char2nr("\<M-x>")  " returns 128
+--- <Non-ASCII characters are always treated as UTF-8 characters.
+--- {utf8} is ignored, it exists only for backwards-compatibility.
+--- A combining character is a separate character.
+--- |nr2char()| does the opposite.
+---
+--- Returns 0 if {string} is not a |String|.
+---
+--- @param string string
+--- @param utf8? any
+--- @return 0|1
+function vim.fn.char2nr(string, utf8) end
+
+--- Return the character class of the first character in {string}.
+--- The character class is one of:
+---   0  blank
+---   1  punctuation
+---   2  word character
+---   3  emoji
+---   other  specific Unicode class
+--- The class is used in patterns and word motions.
+--- Returns 0 if {string} is not a |String|.
+---
+--- @param string string
+--- @return 0|1|2|3|'other'
+function vim.fn.charclass(string) end
+
+--- Same as |col()| but returns the character index of the column
+--- position given with {expr} instead of the byte position.
+---
+--- Example:
+--- With the cursor on '세' in line 5 with text "여보세요": >vim
+---   echo charcol('.')  " returns 3
+---   echo col('.')    " returns 7
+---
+--- @param expr any
+--- @param winid? integer
+--- @return integer
+function vim.fn.charcol(expr, winid) end
+
+--- Return the character index of the byte at {idx} in {string}.
+--- The index of the first character is zero.
+--- If there are no multibyte characters the returned value is
+--- equal to {idx}.
+---
+--- When {countcc} is omitted or |FALSE|, then composing characters
+--- are not counted separately, their byte length is added to the
+--- preceding base character.
+--- When {countcc} is |TRUE|, then composing characters are
+--- counted as separate characters.
+---
+--- When {utf16} is present and TRUE, {idx} is used as the UTF-16
+--- index in the String {expr} instead of as the byte index.
+---
+--- Returns -1 if the arguments are invalid or if there are less
+--- than {idx} bytes. If there are exactly {idx} bytes the length
+--- of the string in characters is returned.
+---
+--- An error is given and -1 is returned if the first argument is
+--- not a string, the second argument is not a number or when the
+--- third argument is present and is not zero or one.
+---
+--- See |byteidx()| and |byteidxcomp()| for getting the byte index
+--- from the character index and |utf16idx()| for getting the
+--- UTF-16 index from the character index.
+--- Refer to |string-offset-encoding| for more information.
+--- Examples: >vim
+---   echo charidx('áb́ć', 3)    " returns 1
+---   echo charidx('áb́ć', 6, 1)  " returns 4
+---   echo charidx('áb́ć', 16)    " returns -1
+---   echo charidx('a😊😊', 4, 0, 1)  " returns 2
+--- <
+---
+--- @param string string
+--- @param idx integer
+--- @param countcc? any
+--- @param utf16? any
+--- @return integer
+function vim.fn.charidx(string, idx, countcc, utf16) end
+
+--- Change the current working directory to {dir}.  The scope of
+--- the directory change depends on the directory of the current
+--- window:
+---   - If the current window has a window-local directory
+---     (|:lcd|), then changes the window local directory.
+---   - Otherwise, if the current tabpage has a local
+---     directory (|:tcd|) then changes the tabpage local
+---     directory.
+---   - Otherwise, changes the global directory.
+--- {dir} must be a String.
+--- If successful, returns the previous working directory.  Pass
+--- this to another chdir() to restore the directory.
+--- On failure, returns an empty string.
+---
+--- Example: >vim
+---   let save_dir = chdir(newdir)
+---   if save_dir != ""
+---      " ... do some work
+---      call chdir(save_dir)
+---   endif
+---
+--- @param dir string
+--- @return string
+function vim.fn.chdir(dir) end
+
+--- Get the amount of indent for line {lnum} according the C
+--- indenting rules, as with 'cindent'.
+--- The indent is counted in spaces, the value of 'tabstop' is
+--- relevant.  {lnum} is used just like in |getline()|.
+--- When {lnum} is invalid -1 is returned.
+--- See |C-indenting|.
+---
+--- @param lnum integer
+--- @return integer
+function vim.fn.cindent(lnum) end
+
+--- Clears all matches previously defined for the current window
+--- by |matchadd()| and the |:match| commands.
+--- If {win} is specified, use the window with this number or
+--- window ID instead of the current window.
+---
+--- @param win? any
+function vim.fn.clearmatches(win) end
+
+--- The result is a Number, which is the byte index of the column
+--- position given with {expr}.  The accepted positions are:
+---     .      the cursor position
+---     $      the end of the cursor line (the result is the
+---       number of bytes in the cursor line plus one)
+---     'x      position of mark x (if the mark is not set, 0 is
+---       returned)
+---     v       In Visual mode: the start of the Visual area (the
+---       cursor is the end).  When not in Visual mode
+---       returns the cursor position.  Differs from |'<| in
+---       that it's updated right away.
+--- Additionally {expr} can be [lnum, col]: a |List| with the line
+--- and column number. Most useful when the column is "$", to get
+--- the last column of a specific line.  When "lnum" or "col" is
+--- out of range then col() returns zero.
+--- With the optional {winid} argument the values are obtained for
+--- that window instead of the current window.
+--- To get the line number use |line()|.  To get both use
+--- |getpos()|.
+--- For the screen column position use |virtcol()|.  For the
+--- character position use |charcol()|.
+--- Note that only marks in the current file can be used.
+--- Examples: >vim
+---   echo col(".")      " column of cursor
+---   echo col("$")      " length of cursor line plus one
+---   echo col("'t")      " column of mark t
+---   echo col("'" .. markname)  " column of mark markname
+--- <The first column is 1.  Returns 0 if {expr} is invalid or when
+--- the window with ID {winid} is not found.
+--- For an uppercase mark the column may actually be in another
+--- buffer.
+--- For the cursor position, when 'virtualedit' is active, the
+--- column is one higher if the cursor is after the end of the
+--- line.  Also, when using a <Cmd> mapping the cursor isn't
+--- moved, this can be used to obtain the column in Insert mode: >vim
+---   imap <F2> <Cmd>echo col(".").."\n"<CR>
+---
+--- @param expr any
+--- @param winid? integer
+--- @return integer
+function vim.fn.col(expr, winid) end
+
+--- Set the matches for Insert mode completion.
+--- Can only be used in Insert mode.  You need to use a mapping
+--- with CTRL-R = (see |i_CTRL-R|).  It does not work after CTRL-O
+--- or with an expression mapping.
+--- {startcol} is the byte offset in the line where the completed
+--- text start.  The text up to the cursor is the original text
+--- that will be replaced by the matches.  Use col('.') for an
+--- empty string.  "col('.') - 1" will replace one character by a
+--- match.
+--- {matches} must be a |List|.  Each |List| item is one match.
+--- See |complete-items| for the kind of items that are possible.
+--- "longest" in 'completeopt' is ignored.
+--- Note that the after calling this function you need to avoid
+--- inserting anything that would cause completion to stop.
+--- The match can be selected with CTRL-N and CTRL-P as usual with
+--- Insert mode completion.  The popup menu will appear if
+--- specified, see |ins-completion-menu|.
+--- Example: >vim
+---   inoremap <F5> <C-R>=ListMonths()<CR>
+---
+---   func ListMonths()
+---     call complete(col('.'), ['January', 'February', 'March',
+---       \ 'April', 'May', 'June', 'July', 'August', 'September',
+---       \ 'October', 'November', 'December'])
+---     return ''
+---   endfunc
+--- <This isn't very useful, but it shows how it works.  Note that
+--- an empty string is returned to avoid a zero being inserted.
+---
+--- @param startcol any
+--- @param matches any
+function vim.fn.complete(startcol, matches) end
+
+--- Add {expr} to the list of matches.  Only to be used by the
+--- function specified with the 'completefunc' option.
+--- Returns 0 for failure (empty string or out of memory),
+--- 1 when the match was added, 2 when the match was already in
+--- the list.
+--- See |complete-functions| for an explanation of {expr}.  It is
+--- the same as one item in the list that 'omnifunc' would return.
+---
+--- @param expr any
+--- @return 0|1|2
+function vim.fn.complete_add(expr) end
+
+--- Check for a key typed while looking for completion matches.
+--- This is to be used when looking for matches takes some time.
+--- Returns |TRUE| when searching for matches is to be aborted,
+--- zero otherwise.
+--- Only to be used by the function specified with the
+--- 'completefunc' option.
+---
+--- @return 0|1
+function vim.fn.complete_check() end
+
+--- Returns a |Dictionary| with information about Insert mode
+--- completion.  See |ins-completion|.
+--- The items are:
+---    mode    Current completion mode name string.
+---     See |complete_info_mode| for the values.
+---    pum_visible  |TRUE| if popup menu is visible.
+---     See |pumvisible()|.
+---    items  List of completion matches.  Each item is a
+---     dictionary containing the entries "word",
+---     "abbr", "menu", "kind", "info" and "user_data".
+---     See |complete-items|.
+---    selected  Selected item index.  First index is zero.
+---     Index is -1 if no item is selected (showing
+---     typed text only, or the last completion after
+---     no item is selected when using the <Up> or
+---     <Down> keys)
+---    inserted  Inserted string. [NOT IMPLEMENTED YET]
+---
+---           *complete_info_mode*
+--- mode values are:
+---    ""         Not in completion mode
+---    "keyword"       Keyword completion |i_CTRL-X_CTRL-N|
+---    "ctrl_x"       Just pressed CTRL-X |i_CTRL-X|
+---    "scroll"       Scrolling with |i_CTRL-X_CTRL-E| or
+---          |i_CTRL-X_CTRL-Y|
+---    "whole_line"       Whole lines |i_CTRL-X_CTRL-L|
+---    "files"       File names |i_CTRL-X_CTRL-F|
+---    "tags"       Tags |i_CTRL-X_CTRL-]|
+---    "path_defines"    Definition completion |i_CTRL-X_CTRL-D|
+---    "path_patterns"   Include completion |i_CTRL-X_CTRL-I|
+---    "dictionary"       Dictionary |i_CTRL-X_CTRL-K|
+---    "thesaurus"       Thesaurus |i_CTRL-X_CTRL-T|
+---    "cmdline"       Vim Command line |i_CTRL-X_CTRL-V|
+---    "function"       User defined completion |i_CTRL-X_CTRL-U|
+---    "omni"       Omni completion |i_CTRL-X_CTRL-O|
+---    "spell"       Spelling suggestions |i_CTRL-X_s|
+---    "eval"       |complete()| completion
+---    "unknown"       Other internal modes
+---
+--- If the optional {what} list argument is supplied, then only
+--- the items listed in {what} are returned.  Unsupported items in
+--- {what} are silently ignored.
+---
+--- To get the position and size of the popup menu, see
+--- |pum_getpos()|. It's also available in |v:event| during the
+--- |CompleteChanged| event.
+---
+--- Returns an empty |Dictionary| on error.
+---
+--- Examples: >vim
+---   " Get all items
+---   call complete_info()
+---   " Get only 'mode'
+---   call complete_info(['mode'])
+---   " Get only 'mode' and 'pum_visible'
+---   call complete_info(['mode', 'pum_visible'])
+---
+--- @param what? any
+--- @return table
+function vim.fn.complete_info(what) end
+
+--- confirm() offers the user a dialog, from which a choice can be
+--- made.  It returns the number of the choice.  For the first
+--- choice this is 1.
+---
+--- {msg} is displayed in a dialog with {choices} as the
+--- alternatives.  When {choices} is missing or empty, "&OK" is
+--- used (and translated).
+--- {msg} is a String, use '\n' to include a newline.  Only on
+--- some systems the string is wrapped when it doesn't fit.
+---
+--- {choices} is a String, with the individual choices separated
+--- by '\n', e.g. >vim
+---   confirm("Save changes?", "&Yes\n&No\n&Cancel")
+--- <The letter after the '&' is the shortcut key for that choice.
+--- Thus you can type 'c' to select "Cancel".  The shortcut does
+--- not need to be the first letter: >vim
+---   confirm("file has been modified", "&Save\nSave &All")
+--- <For the console, the first letter of each choice is used as
+--- the default shortcut key.  Case is ignored.
+---
+--- The optional {type} String argument gives the type of dialog.
+--- It can be one of these values: "Error", "Question", "Info",
+--- "Warning" or "Generic".  Only the first character is relevant.
+--- When {type} is omitted, "Generic" is used.
+---
+--- The optional {type} argument gives the type of dialog.  This
+--- is only used for the icon of the Win32 GUI.  It can be one of
+--- these values: "Error", "Question", "Info", "Warning" or
+--- "Generic".  Only the first character is relevant.
+--- When {type} is omitted, "Generic" is used.
+---
+--- If the user aborts the dialog by pressing <Esc>, CTRL-C,
+--- or another valid interrupt key, confirm() returns 0.
+---
+--- An example: >vim
+---    let choice = confirm("What do you want?",
+---       \ "&Apples\n&Oranges\n&Bananas", 2)
+---    if choice == 0
+---   echo "make up your mind!"
+---    elseif choice == 3
+---   echo "tasteful"
+---    else
+---   echo "I prefer bananas myself."
+---    endif
+--- <In a GUI dialog, buttons are used.  The layout of the buttons
+--- depends on the 'v' flag in 'guioptions'.  If it is included,
+--- the buttons are always put vertically.  Otherwise,  confirm()
+--- tries to put the buttons in one horizontal line.  If they
+--- don't fit, a vertical layout is used anyway.  For some systems
+--- the horizontal layout is always used.
+---
+--- @param msg any
+--- @param choices? any
+--- @param default? any
+--- @param type? any
+--- @return integer
+function vim.fn.confirm(msg, choices, default, type) end
+
+--- Make a copy of {expr}.  For Numbers and Strings this isn't
+--- different from using {expr} directly.
+--- When {expr} is a |List| a shallow copy is created.  This means
+--- that the original |List| can be changed without changing the
+--- copy, and vice versa.  But the items are identical, thus
+--- changing an item changes the contents of both |Lists|.
+--- A |Dictionary| is copied in a similar way as a |List|.
+--- Also see |deepcopy()|.
+---
+--- @param expr any
+--- @return any
+function vim.fn.copy(expr) end
+
+--- Return the cosine of {expr}, measured in radians, as a |Float|.
+--- {expr} must evaluate to a |Float| or a |Number|.
+--- Returns 0.0 if {expr} is not a |Float| or a |Number|.
+--- Examples: >vim
+---   echo cos(100)
+--- <  0.862319 >vim
+---   echo cos(-4.01)
+--- <  -0.646043
+---
+--- @param expr any
+--- @return number
+function vim.fn.cos(expr) end
+
+--- Return the hyperbolic cosine of {expr} as a |Float| in the range
+--- [1, inf].
+--- {expr} must evaluate to a |Float| or a |Number|.
+--- Returns 0.0 if {expr} is not a |Float| or a |Number|.
+--- Examples: >vim
+---   echo cosh(0.5)
+--- <  1.127626 >vim
+---   echo cosh(-0.5)
+--- <  -1.127626
+---
+--- @param expr any
+--- @return number
+function vim.fn.cosh(expr) end
+
+--- Return the number of times an item with value {expr} appears
+--- in |String|, |List| or |Dictionary| {comp}.
+---
+--- If {start} is given then start with the item with this index.
+--- {start} can only be used with a |List|.
+---
+--- When {ic} is given and it's |TRUE| then case is ignored.
+---
+--- When {comp} is a string then the number of not overlapping
+--- occurrences of {expr} is returned. Zero is returned when
+--- {expr} is an empty string.
+---
+--- @param comp any
+--- @param expr any
+--- @param ic? any
+--- @param start? any
+--- @return integer
+function vim.fn.count(comp, expr, ic, start) end
+
+--- Returns a |Dictionary| representing the |context| at {index}
+--- from the top of the |context-stack| (see |context-dict|).
+--- If {index} is not given, it is assumed to be 0 (i.e.: top).
+---
+--- @param index? any
+--- @return table
+function vim.fn.ctxget(index) end
+
+--- Pops and restores the |context| at the top of the
+--- |context-stack|.
+---
+--- @return any
+function vim.fn.ctxpop() end
+
+--- Pushes the current editor state (|context|) on the
+--- |context-stack|.
+--- If {types} is given and is a |List| of |String|s, it specifies
+--- which |context-types| to include in the pushed context.
+--- Otherwise, all context types are included.
+---
+--- @param types? any
+--- @return any
+function vim.fn.ctxpush(types) end
+
+--- Sets the |context| at {index} from the top of the
+--- |context-stack| to that represented by {context}.
+--- {context} is a Dictionary with context data (|context-dict|).
+--- If {index} is not given, it is assumed to be 0 (i.e.: top).
+---
+--- @param context any
+--- @param index? any
+--- @return any
+function vim.fn.ctxset(context, index) end
+
+--- Returns the size of the |context-stack|.
+---
+--- @return any
+function vim.fn.ctxsize() end
+
+--- @param lnum integer
+--- @param col? integer
+--- @param off? any
+--- @return any
+function vim.fn.cursor(lnum, col, off) end
+
+--- Positions the cursor at the column (byte count) {col} in the
+--- line {lnum}.  The first column is one.
+---
+--- When there is one argument {list} this is used as a |List|
+--- with two, three or four item:
+---   [{lnum}, {col}]
+---   [{lnum}, {col}, {off}]
+---   [{lnum}, {col}, {off}, {curswant}]
+--- This is like the return value of |getpos()| or |getcurpos()|,
+--- but without the first item.
+---
+--- To position the cursor using {col} as the character count, use
+--- |setcursorcharpos()|.
+---
+--- Does not change the jumplist.
+--- {lnum} is used like with |getline()|, except that if {lnum} is
+--- zero, the cursor will stay in the current line.
+--- If {lnum} is greater than the number of lines in the buffer,
+--- the cursor will be positioned at the last line in the buffer.
+--- If {col} is greater than the number of bytes in the line,
+--- the cursor will be positioned at the last character in the
+--- line.
+--- If {col} is zero, the cursor will stay in the current column.
+--- If {curswant} is given it is used to set the preferred column
+--- for vertical movement.  Otherwise {col} is used.
+---
+--- When 'virtualedit' is used {off} specifies the offset in
+--- screen columns from the start of the character.  E.g., a
+--- position within a <Tab> or after the last character.
+--- Returns 0 when the position could be set, -1 otherwise.
+---
+--- @param list any
+--- @return any
+function vim.fn.cursor(list) end
+
+--- Specifically used to interrupt a program being debugged.  It
+--- will cause process {pid} to get a SIGTRAP.  Behavior for other
+--- processes is undefined. See |terminal-debug|.
+--- (Sends a SIGINT to a process {pid} other than MS-Windows)
+---
+--- Returns |TRUE| if successfully interrupted the program.
+--- Otherwise returns |FALSE|.
+---
+--- @param pid any
+--- @return any
+function vim.fn.debugbreak(pid) end
+
+--- Make a copy of {expr}.  For Numbers and Strings this isn't
+--- different from using {expr} directly.
+--- When {expr} is a |List| a full copy is created.  This means
+--- that the original |List| can be changed without changing the
+--- copy, and vice versa.  When an item is a |List|, a copy for it
+--- is made, recursively.  Thus changing an item in the copy does
+--- not change the contents of the original |List|.
+---
+--- When {noref} is omitted or zero a contained |List| or
+--- |Dictionary| is only copied once.  All references point to
+--- this single copy.  With {noref} set to 1 every occurrence of a
+--- |List| or |Dictionary| results in a new copy.  This also means
+--- that a cyclic reference causes deepcopy() to fail.
+---             *E724*
+--- Nesting is possible up to 100 levels.  When there is an item
+--- that refers back to a higher level making a deep copy with
+--- {noref} set to 1 will fail.
+--- Also see |copy()|.
+---
+--- @param expr any
+--- @param noref? any
+--- @return any
+function vim.fn.deepcopy(expr, noref) end
+
+--- Without {flags} or with {flags} empty: Deletes the file by the
+--- name {fname}.
+---
+--- This also works when {fname} is a symbolic link.  The symbolic
+--- link itself is deleted, not what it points to.
+---
+--- When {flags} is "d": Deletes the directory by the name
+--- {fname}.  This fails when directory {fname} is not empty.
+---
+--- When {flags} is "rf": Deletes the directory by the name
+--- {fname} and everything in it, recursively.  BE CAREFUL!
+--- Note: on MS-Windows it is not possible to delete a directory
+--- that is being used.
+---
+--- The result is a Number, which is 0/false if the delete
+--- operation was successful and -1/true when the deletion failed
+--- or partly failed.
+---
+--- @param fname string
+--- @param flags? string
+--- @return integer
+function vim.fn.delete(fname, flags) end
+
+--- Delete lines {first} to {last} (inclusive) from buffer {buf}.
+--- If {last} is omitted then delete line {first} only.
+--- On success 0 is returned, on failure 1 is returned.
+---
+--- This function works only for loaded buffers. First call
+--- |bufload()| if needed.
+---
+--- For the use of {buf}, see |bufname()| above.
+---
+--- {first} and {last} are used like with |getline()|. Note that
+--- when using |line()| this refers to the current buffer. Use "$"
+--- to refer to the last line in buffer {buf}.
+---
+--- @param buf any
+--- @param first any
+--- @param last? any
+--- @return any
+function vim.fn.deletebufline(buf, first, last) end
+
+--- Adds a watcher to a dictionary. A dictionary watcher is
+--- identified by three components:
+---
+--- - A dictionary({dict});
+--- - A key pattern({pattern}).
+--- - A function({callback}).
+---
+--- After this is called, every change on {dict} and on keys
+--- matching {pattern} will result in {callback} being invoked.
+---
+--- For example, to watch all global variables: >vim
+---   silent! call dictwatcherdel(g:, '*', 'OnDictChanged')
+---   function! OnDictChanged(d,k,z)
+---     echomsg string(a:k) string(a:z)
+---   endfunction
+---   call dictwatcheradd(g:, '*', 'OnDictChanged')
+--- <
+--- For now {pattern} only accepts very simple patterns that can
+--- contain a "*" at the end of the string, in which case it will
+--- match every key that begins with the substring before the "*".
+--- That means if "*" is not the last character of {pattern}, only
+--- keys that are exactly equal as {pattern} will be matched.
+---
+--- The {callback} receives three arguments:
+---
+--- - The dictionary being watched.
+--- - The key which changed.
+--- - A dictionary containing the new and old values for the key.
+---
+--- The type of change can be determined by examining the keys
+--- present on the third argument:
+---
+--- - If contains both `old` and `new`, the key was updated.
+--- - If it contains only `new`, the key was added.
+--- - If it contains only `old`, the key was deleted.
+---
+--- This function can be used by plugins to implement options with
+--- validation and parsing logic.
+---
+--- @param dict any
+--- @param pattern any
+--- @param callback any
+--- @return any
+function vim.fn.dictwatcheradd(dict, pattern, callback) end
+
+--- Removes a watcher added  with |dictwatcheradd()|. All three
+--- arguments must match the ones passed to |dictwatcheradd()| in
+--- order for the watcher to be successfully deleted.
+---
+--- @param dict any
+--- @param pattern any
+--- @param callback any
+--- @return any
+function vim.fn.dictwatcherdel(dict, pattern, callback) end
+
+--- Returns |TRUE| when autocommands are being executed and the
+--- FileType event has been triggered at least once.  Can be used
+--- to avoid triggering the FileType event again in the scripts
+--- that detect the file type. |FileType|
+--- Returns |FALSE| when `:setf FALLBACK` was used.
+--- When editing another file, the counter is reset, thus this
+--- really checks if the FileType event has been triggered for the
+--- current buffer.  This allows an autocommand that starts
+--- editing another buffer to set 'filetype' and load a syntax
+--- file.
+---
+--- @return any
+function vim.fn.did_filetype() end
+
+--- Returns the number of filler lines above line {lnum}.
+--- These are the lines that were inserted at this point in
+--- another diff'ed window.  These filler lines are shown in the
+--- display but don't exist in the buffer.
+--- {lnum} is used like with |getline()|.  Thus "." is the current
+--- line, "'m" mark m, etc.
+--- Returns 0 if the current window is not in diff mode.
+---
+--- @param lnum integer
+--- @return any
+function vim.fn.diff_filler(lnum) end
+
+--- Returns the highlight ID for diff mode at line {lnum} column
+--- {col} (byte index).  When the current line does not have a
+--- diff change zero is returned.
+--- {lnum} is used like with |getline()|.  Thus "." is the current
+--- line, "'m" mark m, etc.
+--- {col} is 1 for the leftmost column, {lnum} is 1 for the first
+--- line.
+--- The highlight ID can be used with |synIDattr()| to obtain
+--- syntax information about the highlighting.
+---
+--- @param lnum integer
+--- @param col integer
+--- @return any
+function vim.fn.diff_hlID(lnum, col) end
+
+--- Return the digraph of {chars}.  This should be a string with
+--- exactly two characters.  If {chars} are not just two
+--- characters, or the digraph of {chars} does not exist, an error
+--- is given and an empty string is returned.
+---
+--- Also see |digraph_getlist()|.
+---
+--- Examples: >vim
+--- " Get a built-in digraph
+--- echo digraph_get('00')    " Returns '∞'
+---
+--- " Get a user-defined digraph
+--- call digraph_set('aa', 'あ')
+--- echo digraph_get('aa')    " Returns 'あ'
+--- <
+---
+--- @param chars any
+--- @return any
+function vim.fn.digraph_get(chars) end
+
+--- Return a list of digraphs.  If the {listall} argument is given
+--- and it is TRUE, return all digraphs, including the default
+--- digraphs.  Otherwise, return only user-defined digraphs.
+---
+--- Also see |digraph_get()|.
+---
+--- Examples: >vim
+--- " Get user-defined digraphs
+--- echo digraph_getlist()
+---
+--- " Get all the digraphs, including default digraphs
+--- echo digraph_getlist(1)
+--- <
+---
+--- @param listall? any
+--- @return any
+function vim.fn.digraph_getlist(listall) end
+
+--- Add digraph {chars} to the list.  {chars} must be a string
+--- with two characters.  {digraph} is a string with one UTF-8
+--- encoded character.  *E1215*
+--- Be careful, composing characters are NOT ignored.  This
+--- function is similar to |:digraphs| command, but useful to add
+--- digraphs start with a white space.
+---
+--- The function result is v:true if |digraph| is registered.  If
+--- this fails an error message is given and v:false is returned.
+---
+--- If you want to define multiple digraphs at once, you can use
+--- |digraph_setlist()|.
+---
+--- Example: >vim
+---   call digraph_set('  ', 'あ')
+--- <
+--- Can be used as a |method|: >vim
+---   GetString()->digraph_set('あ')
+--- <
+---
+--- @param chars any
+--- @param digraph any
+--- @return any
+function vim.fn.digraph_set(chars, digraph) end
+
+--- Similar to |digraph_set()| but this function can add multiple
+--- digraphs at once.  {digraphlist} is a list composed of lists,
+--- where each list contains two strings with {chars} and
+--- {digraph} as in |digraph_set()|. *E1216*
+--- Example: >vim
+---     call digraph_setlist([['aa', 'あ'], ['ii', 'い']])
+--- <
+--- It is similar to the following: >vim
+---     for [chars, digraph] in [['aa', 'あ'], ['ii', 'い']]
+---     call digraph_set(chars, digraph)
+---     endfor
+--- <Except that the function returns after the first error,
+--- following digraphs will not be added.
+---
+--- Can be used as a |method|: >vim
+---     GetList()->digraph_setlist()
+--- <
+---
+--- @param digraphlist any
+--- @return any
+function vim.fn.digraph_setlist(digraphlist) end
+
+--- Return the Number 1 if {expr} is empty, zero otherwise.
+--- - A |List| or |Dictionary| is empty when it does not have any
+---   items.
+--- - A |String| is empty when its length is zero.
+--- - A |Number| and |Float| are empty when their value is zero.
+--- - |v:false| and |v:null| are empty, |v:true| is not.
+--- - A |Blob| is empty when its length is zero.
+---
+--- @param expr any
+--- @return any
+function vim.fn.empty(expr) end
+
+--- Return all of environment variables as dictionary. You can
+--- check if an environment variable exists like this: >vim
+---   echo has_key(environ(), 'HOME')
+--- <Note that the variable name may be CamelCase; to ignore case
+--- use this: >vim
+---   echo index(keys(environ()), 'HOME', 0, 1) != -1
+--- <
+---
+--- @return any
+function vim.fn.environ() end
+
+--- Escape the characters in {chars} that occur in {string} with a
+--- backslash.  Example: >vim
+---   echo escape('c:\program files\vim', ' \')
+--- <results in: >
+---   c:\\program\ files\\vim
+--- <Also see |shellescape()| and |fnameescape()|.
+---
+--- @param string string
+--- @param chars any
+--- @return any
+function vim.fn.escape(string, chars) end
+
+--- Evaluate {string} and return the result.  Especially useful to
+--- turn the result of |string()| back into the original value.
+--- This works for Numbers, Floats, Strings, Blobs and composites
+--- of them.  Also works for |Funcref|s that refer to existing
+--- functions.
+---
+--- @param string string
+--- @return any
+function vim.fn.eval(string) end
+
+--- Returns 1 when inside an event handler.  That is that Vim got
+--- interrupted while waiting for the user to type a character,
+--- e.g., when dropping a file on Vim.  This means interactive
+--- commands cannot be used.  Otherwise zero is returned.
+---
+--- @return any
+function vim.fn.eventhandler() end
+
+--- This function checks if an executable with the name {expr}
+--- exists.  {expr} must be the name of the program without any
+--- arguments.
+--- executable() uses the value of $PATH and/or the normal
+--- searchpath for programs.    *PATHEXT*
+--- On MS-Windows the ".exe", ".bat", etc. can optionally be
+--- included.  Then the extensions in $PATHEXT are tried.  Thus if
+--- "foo.exe" does not exist, "foo.exe.bat" can be found.  If
+--- $PATHEXT is not set then ".exe;.com;.bat;.cmd" is used.  A dot
+--- by itself can be used in $PATHEXT to try using the name
+--- without an extension.  When 'shell' looks like a Unix shell,
+--- then the name is also tried without adding an extension.
+--- On MS-Windows it only checks if the file exists and is not a
+--- directory, not if it's really executable.
+--- On Windows an executable in the same directory as Vim is
+--- always found (it is added to $PATH at |startup|).
+--- The result is a Number:
+---   1  exists
+---   0  does not exist
+---   -1  not implemented on this system
+--- |exepath()| can be used to get the full path of an executable.
+---
+--- @param expr any
+--- @return 0|1|-1
+function vim.fn.executable(expr) end
+
+--- Execute {command} and capture its output.
+--- If {command} is a |String|, returns {command} output.
+--- If {command} is a |List|, returns concatenated outputs.
+--- Line continuations in {command} are not recognized.
+--- Examples: >vim
+---   echo execute('echon "foo"')
+--- <  foo >vim
+---   echo execute(['echon "foo"', 'echon "bar"'])
+--- <  foobar
+---
+--- The optional {silent} argument can have these values:
+---   ""    no `:silent` used
+---   "silent"  `:silent` used
+---   "silent!"  `:silent!` used
+--- The default is "silent".  Note that with "silent!", unlike
+--- `:redir`, error messages are dropped.
+---
+--- To get a list of lines use `split()` on the result: >vim
+---   execute('args')->split("\n")
+---
+--- <This function is not available in the |sandbox|.
+--- Note: If nested, an outer execute() will not observe output of
+--- the inner calls.
+--- Note: Text attributes (highlights) are not captured.
+--- To execute a command in another window than the current one
+--- use `win_execute()`.
+---
+--- @param command string|string[]
+--- @param silent? ''|'silent'|'silent!'
+--- @return string
+function vim.fn.execute(command, silent) end
+
+--- Returns the full path of {expr} if it is an executable and
+--- given as a (partial or full) path or is found in $PATH.
+--- Returns empty string otherwise.
+--- If {expr} starts with "./" the |current-directory| is used.
+---
+--- @param expr any
+--- @return any
+function vim.fn.exepath(expr) end
+
+--- The result is a Number, which is |TRUE| if {expr} is
+--- defined, zero otherwise.
+---
+--- For checking for a supported feature use |has()|.
+--- For checking if a file exists use |filereadable()|.
+---
+--- The {expr} argument is a string, which contains one of these:
+---   varname    internal variable (see
+---   dict.key  |internal-variables|).  Also works
+---   list[i]    for |curly-braces-names|, |Dictionary|
+---       entries, |List| items, etc.
+---       Beware that evaluating an index may
+---       cause an error message for an invalid
+---       expression.  E.g.: >vim
+---          let l = [1, 2, 3]
+---          echo exists("l[5]")
+--- <         0 >vim
+---          echo exists("l[xx]")
+--- <         E121: Undefined variable: xx
+---          0
+---   &option-name  Vim option (only checks if it exists,
+---       not if it really works)
+---   +option-name  Vim option that works.
+---   $ENVNAME  environment variable (could also be
+---       done by comparing with an empty
+---       string)
+---   `*funcname`  built-in function (see |functions|)
+---       or user defined function (see
+---       |user-function|). Also works for a
+---       variable that is a Funcref.
+---   :cmdname  Ex command: built-in command, user
+---       command or command modifier |:command|.
+---       Returns:
+---       1  for match with start of a command
+---       2  full match with a command
+---       3  matches several user commands
+---       To check for a supported command
+---       always check the return value to be 2.
+---   :2match    The |:2match| command.
+---   :3match    The |:3match| command (but you
+---       probably should not use it, it is
+---       reserved for internal usage)
+---   #event    autocommand defined for this event
+---   #event#pattern  autocommand defined for this event and
+---       pattern (the pattern is taken
+---       literally and compared to the
+---       autocommand patterns character by
+---       character)
+---   #group    autocommand group exists
+---   #group#event  autocommand defined for this group and
+---       event.
+---   #group#event#pattern
+---       autocommand defined for this group,
+---       event and pattern.
+---   ##event    autocommand for this event is
+---       supported.
+---
+--- Examples: >vim
+---   echo exists("&mouse")
+---   echo exists("$HOSTNAME")
+---   echo exists("*strftime")
+---   echo exists("*s:MyFunc")
+---   echo exists("*MyFunc")
+---   echo exists("bufcount")
+---   echo exists(":Make")
+---   echo exists("#CursorHold")
+---   echo exists("#BufReadPre#*.gz")
+---   echo exists("#filetypeindent")
+---   echo exists("#filetypeindent#FileType")
+---   echo exists("#filetypeindent#FileType#*")
+---   echo exists("##ColorScheme")
+--- <There must be no space between the symbol (&/$/*/#) and the
+--- name.
+--- There must be no extra characters after the name, although in
+--- a few cases this is ignored.  That may become stricter in the
+--- future, thus don't count on it!
+--- Working example: >vim
+---   echo exists(":make")
+--- <NOT working example: >vim
+---   echo exists(":make install")
+---
+--- <Note that the argument must be a string, not the name of the
+--- variable itself.  For example: >vim
+---   echo exists(bufcount)
+--- <This doesn't check for existence of the "bufcount" variable,
+--- but gets the value of "bufcount", and checks if that exists.
+---
+--- @param expr any
+--- @return 0|1
+function vim.fn.exists(expr) end
+
+--- Return the exponential of {expr} as a |Float| in the range
+--- [0, inf].
+--- {expr} must evaluate to a |Float| or a |Number|.
+--- Returns 0.0 if {expr} is not a |Float| or a |Number|.
+--- Examples: >vim
+---   echo exp(2)
+--- <  7.389056 >vim
+---   echo exp(-1)
+--- <  0.367879
+---
+--- @param expr any
+--- @return any
+function vim.fn.exp(expr) end
+
+--- Expand wildcards and the following special keywords in
+--- {string}.  'wildignorecase' applies.
+---
+--- If {list} is given and it is |TRUE|, a List will be returned.
+--- Otherwise the result is a String and when there are several
+--- matches, they are separated by <NL> characters.
+---
+--- If the expansion fails, the result is an empty string.  A name
+--- for a non-existing file is not included, unless {string} does
+--- not start with '%', '#' or '<', see below.
+---
+--- When {string} starts with '%', '#' or '<', the expansion is
+--- done like for the |cmdline-special| variables with their
+--- associated modifiers.  Here is a short overview:
+---
+---   %    current file name
+---   #    alternate file name
+---   #n    alternate file name n
+---   <cfile>    file name under the cursor
+---   <afile>    autocmd file name
+---   <abuf>    autocmd buffer number (as a String!)
+---   <amatch>  autocmd matched name
+---   <cexpr>    C expression under the cursor
+---   <sfile>    sourced script file or function name
+---   <slnum>    sourced script line number or function
+---       line number
+---   <sflnum>  script file line number, also when in
+---       a function
+---   <SID>    "<SNR>123_"  where "123" is the
+---       current script ID  |<SID>|
+---   <script>  sourced script file, or script file
+---       where the current function was defined
+---   <stack>    call stack
+---   <cword>    word under the cursor
+---   <cWORD>    WORD under the cursor
+---   <client>  the {clientid} of the last received
+---       message
+--- Modifiers:
+---   :p    expand to full path
+---   :h    head (last path component removed)
+---   :t    tail (last path component only)
+---   :r    root (one extension removed)
+---   :e    extension only
+---
+--- Example: >vim
+---   let &tags = expand("%:p:h") .. "/tags"
+--- <Note that when expanding a string that starts with '%', '#' or
+--- '<', any following text is ignored.  This does NOT work: >vim
+---   let doesntwork = expand("%:h.bak")
+--- <Use this: >vim
+---   let doeswork = expand("%:h") .. ".bak"
+--- <Also note that expanding "<cfile>" and others only returns the
+--- referenced file name without further expansion.  If "<cfile>"
+--- is "~/.cshrc", you need to do another expand() to have the
+--- "~/" expanded into the path of the home directory: >vim
+---   echo expand(expand("<cfile>"))
+--- <
+--- There cannot be white space between the variables and the
+--- following modifier.  The |fnamemodify()| function can be used
+--- to modify normal file names.
+---
+--- When using '%' or '#', and the current or alternate file name
+--- is not defined, an empty string is used.  Using "%:p" in a
+--- buffer with no name, results in the current directory, with a
+--- '/' added.
+--- When 'verbose' is set then expanding '%', '#' and <> items
+--- will result in an error message if the argument cannot be
+--- expanded.
+---
+--- When {string} does not start with '%', '#' or '<', it is
+--- expanded like a file name is expanded on the command line.
+--- 'suffixes' and 'wildignore' are used, unless the optional
+--- {nosuf} argument is given and it is |TRUE|.
+--- Names for non-existing files are included.  The "**" item can
+--- be used to search in a directory tree.  For example, to find
+--- all "README" files in the current directory and below: >vim
+---   echo expand("**/README")
+--- <
+--- expand() can also be used to expand variables and environment
+--- variables that are only known in a shell.  But this can be
+--- slow, because a shell may be used to do the expansion.  See
+--- |expr-env-expand|.
+--- The expanded variable is still handled like a list of file
+--- names.  When an environment variable cannot be expanded, it is
+--- left unchanged.  Thus ":echo expand('$FOOBAR')" results in
+--- "$FOOBAR".
+---
+--- See |glob()| for finding existing files.  See |system()| for
+--- getting the raw output of an external command.
+---
+--- @param string string
+--- @param nosuf? boolean
+--- @param list? any
+--- @return string|string[]
+function vim.fn.expand(string, nosuf, list) end
+
+--- Expand special items in String {string} like what is done for
+--- an Ex command such as `:edit`.  This expands special keywords,
+--- like with |expand()|, and environment variables, anywhere in
+--- {string}.  "~user" and "~/path" are only expanded at the
+--- start.
+---
+--- The following items are supported in the {options} Dict
+--- argument:
+---     errmsg  If set to TRUE, error messages are displayed
+---     if an error is encountered during expansion.
+---     By default, error messages are not displayed.
+---
+--- Returns the expanded string.  If an error is encountered
+--- during expansion, the unmodified {string} is returned.
+---
+--- Example: >vim
+---   echo expandcmd('make %<.o')
+--- < >
+---   make /path/runtime/doc/builtin.o
+--- < >vim
+---   echo expandcmd('make %<.o', {'errmsg': v:true})
+--- <
+---
+--- @param string string
+--- @param options? table
+--- @return any
+function vim.fn.expandcmd(string, options) end
+
+--- {expr1} and {expr2} must be both |Lists| or both
+--- |Dictionaries|.
+---
+--- If they are |Lists|: Append {expr2} to {expr1}.
+--- If {expr3} is given insert the items of {expr2} before the
+--- item with index {expr3} in {expr1}.  When {expr3} is zero
+--- insert before the first item.  When {expr3} is equal to
+--- len({expr1}) then {expr2} is appended.
+--- Examples: >vim
+---   echo sort(extend(mylist, [7, 5]))
+---   call extend(mylist, [2, 3], 1)
+--- <When {expr1} is the same List as {expr2} then the number of
+--- items copied is equal to the original length of the List.
+--- E.g., when {expr3} is 1 you get N new copies of the first item
+--- (where N is the original length of the List).
+--- Use |add()| to concatenate one item to a list.  To concatenate
+--- two lists into a new list use the + operator: >vim
+---   let newlist = [1, 2, 3] + [4, 5]
+--- <
+--- If they are |Dictionaries|:
+--- Add all entries from {expr2} to {expr1}.
+--- If a key exists in both {expr1} and {expr2} then {expr3} is
+--- used to decide what to do:
+--- {expr3} = "keep": keep the value of {expr1}
+--- {expr3} = "force": use the value of {expr2}
+--- {expr3} = "error": give an error message    *E737*
+--- When {expr3} is omitted then "force" is assumed.
+---
+--- {expr1} is changed when {expr2} is not empty.  If necessary
+--- make a copy of {expr1} first.
+--- {expr2} remains unchanged.
+--- When {expr1} is locked and {expr2} is not empty the operation
+--- fails.
+--- Returns {expr1}.  Returns 0 on error.
+---
+--- @param expr1 any
+--- @param expr2 any
+--- @param expr3? any
+--- @return any
+function vim.fn.extend(expr1, expr2, expr3) end
+
+--- Like |extend()| but instead of adding items to {expr1} a new
+--- List or Dictionary is created and returned.  {expr1} remains
+--- unchanged.
+---
+--- @param expr1 any
+--- @param expr2 any
+--- @param expr3? any
+--- @return any
+function vim.fn.extendnew(expr1, expr2, expr3) end
+
+--- Characters in {string} are queued for processing as if they
+--- come from a mapping or were typed by the user.
+---
+--- By default the string is added to the end of the typeahead
+--- buffer, thus if a mapping is still being executed the
+--- characters come after them.  Use the 'i' flag to insert before
+--- other characters, they will be executed next, before any
+--- characters from a mapping.
+---
+--- The function does not wait for processing of keys contained in
+--- {string}.
+---
+--- To include special keys into {string}, use double-quotes
+--- and "\..." notation |expr-quote|. For example,
+--- feedkeys("\<CR>") simulates pressing of the <Enter> key. But
+--- feedkeys('\<CR>') pushes 5 characters.
+--- The |<Ignore>| keycode may be used to exit the
+--- wait-for-character without doing anything.
+---
+--- {mode} is a String, which can contain these character flags:
+--- 'm'  Remap keys. This is default.  If {mode} is absent,
+---   keys are remapped.
+--- 'n'  Do not remap keys.
+--- 't'  Handle keys as if typed; otherwise they are handled as
+---   if coming from a mapping.  This matters for undo,
+---   opening folds, etc.
+--- 'i'  Insert the string instead of appending (see above).
+--- 'x'  Execute commands until typeahead is empty.  This is
+---   similar to using ":normal!".  You can call feedkeys()
+---   several times without 'x' and then one time with 'x'
+---   (possibly with an empty {string}) to execute all the
+---   typeahead.  Note that when Vim ends in Insert mode it
+---   will behave as if <Esc> is typed, to avoid getting
+---   stuck, waiting for a character to be typed before the
+---   script continues.
+---   Note that if you manage to call feedkeys() while
+---   executing commands, thus calling it recursively, then
+---   all typeahead will be consumed by the last call.
+--- '!'  When used with 'x' will not end Insert mode. Can be
+---   used in a test when a timer is set to exit Insert mode
+---   a little later.  Useful for testing CursorHoldI.
+---
+--- Return value is always 0.
+---
+--- @param string string
+--- @param mode? string
+--- @return any
+function vim.fn.feedkeys(string, mode) end
+
+--- @deprecated
+--- Obsolete name for |filereadable()|.
+---
+--- @param file string
+--- @return any
+function vim.fn.file_readable(file) end
+
+--- The result is a Number, which is |TRUE| when a file with the
+--- name {file} exists, and can be read.  If {file} doesn't exist,
+--- or is a directory, the result is |FALSE|.  {file} is any
+--- expression, which is used as a String.
+--- If you don't care about the file being readable you can use
+--- |glob()|.
+--- {file} is used as-is, you may want to expand wildcards first: >vim
+---   echo filereadable('~/.vimrc')
+--- < >
+---   0
+--- < >vim
+---   echo filereadable(expand('~/.vimrc'))
+--- < >
+---   1
+--- <
+---
+--- @param file string
+--- @return 0|1
+function vim.fn.filereadable(file) end
+
+--- The result is a Number, which is 1 when a file with the
+--- name {file} exists, and can be written.  If {file} doesn't
+--- exist, or is not writable, the result is 0.  If {file} is a
+--- directory, and we can write to it, the result is 2.
+---
+--- @param file string
+--- @return 0|1
+function vim.fn.filewritable(file) end
+
+--- {expr1} must be a |List|, |String|, |Blob| or |Dictionary|.
+--- For each item in {expr1} evaluate {expr2} and when the result
+--- is zero or false remove the item from the |List| or
+--- |Dictionary|.  Similarly for each byte in a |Blob| and each
+--- character in a |String|.
+---
+--- {expr2} must be a |string| or |Funcref|.
+---
+--- If {expr2} is a |string|, inside {expr2} |v:val| has the value
+--- of the current item.  For a |Dictionary| |v:key| has the key
+--- of the current item and for a |List| |v:key| has the index of
+--- the current item.  For a |Blob| |v:key| has the index of the
+--- current byte. For a |String| |v:key| has the index of the
+--- current character.
+--- Examples: >vim
+---   call filter(mylist, 'v:val !~ "OLD"')
+--- <Removes the items where "OLD" appears. >vim
+---   call filter(mydict, 'v:key >= 8')
+--- <Removes the items with a key below 8. >vim
+---   call filter(var, 0)
+--- <Removes all the items, thus clears the |List| or |Dictionary|.
+---
+--- Note that {expr2} is the result of expression and is then
+--- used as an expression again.  Often it is good to use a
+--- |literal-string| to avoid having to double backslashes.
+---
+--- If {expr2} is a |Funcref| it must take two arguments:
+---   1. the key or the index of the current item.
+---   2. the value of the current item.
+--- The function must return |TRUE| if the item should be kept.
+--- Example that keeps the odd items of a list: >vim
+---   func Odd(idx, val)
+---     return a:idx % 2 == 1
+---   endfunc
+---   call filter(mylist, function('Odd'))
+--- <It is shorter when using a |lambda|: >vim
+---   call filter(myList, {idx, val -> idx * val <= 42})
+--- <If you do not use "val" you can leave it out: >vim
+---   call filter(myList, {idx -> idx % 2 == 1})
+--- <
+--- For a |List| and a |Dictionary| the operation is done
+--- in-place.  If you want it to remain unmodified make a copy
+--- first: >vim
+---   let l = filter(copy(mylist), 'v:val =~ "KEEP"')
+---
+--- <Returns {expr1}, the |List| or |Dictionary| that was filtered,
+--- or a new |Blob| or |String|.
+--- When an error is encountered while evaluating {expr2} no
+--- further items in {expr1} are processed.
+--- When {expr2} is a Funcref errors inside a function are ignored,
+--- unless it was defined with the "abort" flag.
+---
+--- @param expr1 any
+--- @param expr2 any
+--- @return any
+function vim.fn.filter(expr1, expr2) end
+
+--- Find directory {name} in {path}.  Supports both downwards and
+--- upwards recursive directory searches.  See |file-searching|
+--- for the syntax of {path}.
+---
+--- Returns the path of the first found match.  When the found
+--- directory is below the current directory a relative path is
+--- returned.  Otherwise a full path is returned.
+--- If {path} is omitted or empty then 'path' is used.
+---
+--- If the optional {count} is given, find {count}'s occurrence of
+--- {name} in {path} instead of the first one.
+--- When {count} is negative return all the matches in a |List|.
+---
+--- Returns an empty string if the directory is not found.
+---
+--- This is quite similar to the ex-command `:find`.
+---
+--- @param name string
+--- @param path? string
+--- @param count? any
+--- @return any
+function vim.fn.finddir(name, path, count) end
+
+--- Just like |finddir()|, but find a file instead of a directory.
+--- Uses 'suffixesadd'.
+--- Example: >vim
+---   echo findfile("tags.vim", ".;")
+--- <Searches from the directory of the current file upwards until
+--- it finds the file "tags.vim".
+---
+--- @param name string
+--- @param path? string
+--- @param count? any
+--- @return any
+function vim.fn.findfile(name, path, count) end
+
+--- Flatten {list} up to {maxdepth} levels.  Without {maxdepth}
+--- the result is a |List| without nesting, as if {maxdepth} is
+--- a very large number.
+--- The {list} is changed in place, use |flattennew()| if you do
+--- not want that.
+---             *E900*
+--- {maxdepth} means how deep in nested lists changes are made.
+--- {list} is not modified when {maxdepth} is 0.
+--- {maxdepth} must be positive number.
+---
+--- If there is an error the number zero is returned.
+---
+--- Example: >vim
+---   echo flatten([1, [2, [3, 4]], 5])
+--- <  [1, 2, 3, 4, 5] >vim
+---   echo flatten([1, [2, [3, 4]], 5], 1)
+--- <  [1, 2, [3, 4], 5]
+---
+--- @param list any
+--- @param maxdepth? any
+--- @return any[]|0
+function vim.fn.flatten(list, maxdepth) end
+
+--- Like |flatten()| but first make a copy of {list}.
+---
+--- @param list any
+--- @param maxdepth? any
+--- @return any[]|0
+function vim.fn.flattennew(list, maxdepth) end
+
+--- Convert {expr} to a Number by omitting the part after the
+--- decimal point.
+--- {expr} must evaluate to a |Float| or a |Number|.
+--- Returns 0 if {expr} is not a |Float| or a |Number|.
+--- When the value of {expr} is out of range for a |Number| the
+--- result is truncated to 0x7fffffff or -0x7fffffff (or when
+--- 64-bit Number support is enabled, 0x7fffffffffffffff or
+--- -0x7fffffffffffffff).  NaN results in -0x80000000 (or when
+--- 64-bit Number support is enabled, -0x8000000000000000).
+--- Examples: >vim
+---   echo float2nr(3.95)
+--- <  3  >vim
+---   echo float2nr(-23.45)
+--- <  -23  >vim
+---   echo float2nr(1.0e100)
+--- <  2147483647  (or 9223372036854775807) >vim
+---   echo float2nr(-1.0e150)
+--- <  -2147483647 (or -9223372036854775807) >vim
+---   echo float2nr(1.0e-100)
+--- <  0
+---
+--- @param expr any
+--- @return any
+function vim.fn.float2nr(expr) end
+
+--- Return the largest integral value less than or equal to
+--- {expr} as a |Float| (round down).
+--- {expr} must evaluate to a |Float| or a |Number|.
+--- Returns 0.0 if {expr} is not a |Float| or a |Number|.
+--- Examples: >vim
+---   echo floor(1.856)
+--- <  1.0  >vim
+---   echo floor(-5.456)
+--- <  -6.0  >vim
+---   echo floor(4.0)
+--- <  4.0
+---
+--- @param expr any
+--- @return any
+function vim.fn.floor(expr) end
+
+--- Return the remainder of {expr1} / {expr2}, even if the
+--- division is not representable.  Returns {expr1} - i * {expr2}
+--- for some integer i such that if {expr2} is non-zero, the
+--- result has the same sign as {expr1} and magnitude less than
+--- the magnitude of {expr2}.  If {expr2} is zero, the value
+--- returned is zero.  The value returned is a |Float|.
+--- {expr1} and {expr2} must evaluate to a |Float| or a |Number|.
+--- Returns 0.0 if {expr1} or {expr2} is not a |Float| or a
+--- |Number|.
+--- Examples: >vim
+---   echo fmod(12.33, 1.22)
+--- <  0.13 >vim
+---   echo fmod(-12.33, 1.22)
+--- <  -0.13
+---
+--- @param expr1 any
+--- @param expr2 any
+--- @return any
+function vim.fn.fmod(expr1, expr2) end
+
+--- Escape {string} for use as file name command argument.  All
+--- characters that have a special meaning, such as `'%'` and `'|'`
+--- are escaped with a backslash.
+--- For most systems the characters escaped are
+--- " \t\n*?[{`$\\%#'\"|!<".  For systems where a backslash
+--- appears in a filename, it depends on the value of 'isfname'.
+--- A leading '+' and '>' is also escaped (special after |:edit|
+--- and |:write|).  And a "-" by itself (special after |:cd|).
+--- Returns an empty string on error.
+--- Example: >vim
+---   let fname = '+some str%nge|name'
+---   exe "edit " .. fnameescape(fname)
+--- <results in executing: >vim
+---   edit \+some\ str\%nge\|name
+--- <
+---
+--- @param string string
+--- @return string
+function vim.fn.fnameescape(string) end
+
+--- Modify file name {fname} according to {mods}.  {mods} is a
+--- string of characters like it is used for file names on the
+--- command line.  See |filename-modifiers|.
+--- Example: >vim
+---   echo fnamemodify("main.c", ":p:h")
+--- <results in: >
+---   /home/user/vim/vim/src
+--- <If {mods} is empty or an unsupported modifier is used then
+--- {fname} is returned.
+--- When {fname} is empty then with {mods} ":h" returns ".", so
+--- that `:cd` can be used with it.  This is different from
+--- expand('%:h') without a buffer name, which returns an empty
+--- string.
+--- Note: Environment variables don't work in {fname}, use
+--- |expand()| first then.
+---
+--- @param fname string
+--- @param mods string
+--- @return string
+function vim.fn.fnamemodify(fname, mods) end
+
+--- The result is a Number.  If the line {lnum} is in a closed
+--- fold, the result is the number of the first line in that fold.
+--- If the line {lnum} is not in a closed fold, -1 is returned.
+--- {lnum} is used like with |getline()|.  Thus "." is the current
+--- line, "'m" mark m, etc.
+---
+--- @param lnum integer
+--- @return integer
+function vim.fn.foldclosed(lnum) end
+
+--- The result is a Number.  If the line {lnum} is in a closed
+--- fold, the result is the number of the last line in that fold.
+--- If the line {lnum} is not in a closed fold, -1 is returned.
+--- {lnum} is used like with |getline()|.  Thus "." is the current
+--- line, "'m" mark m, etc.
+---
+--- @param lnum integer
+--- @return integer
+function vim.fn.foldclosedend(lnum) end
+
+--- The result is a Number, which is the foldlevel of line {lnum}
+--- in the current buffer.  For nested folds the deepest level is
+--- returned.  If there is no fold at line {lnum}, zero is
+--- returned.  It doesn't matter if the folds are open or closed.
+--- When used while updating folds (from 'foldexpr') -1 is
+--- returned for lines where folds are still to be updated and the
+--- foldlevel is unknown.  As a special case the level of the
+--- previous line is usually available.
+--- {lnum} is used like with |getline()|.  Thus "." is the current
+--- line, "'m" mark m, etc.
+---
+--- @param lnum integer
+--- @return integer
+function vim.fn.foldlevel(lnum) end
+
+--- Returns a String, to be displayed for a closed fold.  This is
+--- the default function used for the 'foldtext' option and should
+--- only be called from evaluating 'foldtext'.  It uses the
+--- |v:foldstart|, |v:foldend| and |v:folddashes| variables.
+--- The returned string looks like this: >
+---   +-- 45 lines: abcdef
+--- <The number of leading dashes depends on the foldlevel.  The
+--- "45" is the number of lines in the fold.  "abcdef" is the text
+--- in the first non-blank line of the fold.  Leading white space,
+--- "//" or "/*" and the text from the 'foldmarker' and
+--- 'commentstring' options is removed.
+--- When used to draw the actual foldtext, the rest of the line
+--- will be filled with the fold char from the 'fillchars'
+--- setting.
+--- Returns an empty string when there is no fold.
+---
+--- @return string
+function vim.fn.foldtext() end
+
+--- Returns the text that is displayed for the closed fold at line
+--- {lnum}.  Evaluates 'foldtext' in the appropriate context.
+--- When there is no closed fold at {lnum} an empty string is
+--- returned.
+--- {lnum} is used like with |getline()|.  Thus "." is the current
+--- line, "'m" mark m, etc.
+--- Useful when exporting folded text, e.g., to HTML.
+---
+--- @param lnum integer
+--- @return string
+function vim.fn.foldtextresult(lnum) end
+
+--- Get the full command name from a short abbreviated command
+--- name; see |20.2| for details on command abbreviations.
+---
+--- The string argument {name} may start with a `:` and can
+--- include a [range], these are skipped and not returned.
+--- Returns an empty string if a command doesn't exist or if it's
+--- ambiguous (for user-defined commands).
+---
+--- For example `fullcommand('s')`, `fullcommand('sub')`,
+--- `fullcommand(':%substitute')` all return "substitute".
+---
+--- @param name string
+--- @return string
+function vim.fn.fullcommand(name) end
+
+--- Just like |function()|, but the returned Funcref will lookup
+--- the function by reference, not by name.  This matters when the
+--- function {name} is redefined later.
+---
+--- Unlike |function()|, {name} must be an existing user function.
+--- It only works for an autoloaded function if it has already
+--- been loaded (to avoid mistakenly loading the autoload script
+--- when only intending to use the function name, use |function()|
+--- instead). {name} cannot be a builtin function.
+--- Returns 0 on error.
+---
+--- @param name string
+--- @param arglist? any
+--- @param dict? any
+--- @return any
+function vim.fn.funcref(name, arglist, dict) end
+
+--- Return a |Funcref| variable that refers to function {name}.
+--- {name} can be the name of a user defined function or an
+--- internal function.
+---
+--- {name} can also be a Funcref or a partial. When it is a
+--- partial the dict stored in it will be used and the {dict}
+--- argument is not allowed. E.g.: >vim
+---   let FuncWithArg = function(dict.Func, [arg])
+---   let Broken = function(dict.Func, [arg], dict)
+--- <
+--- When using the Funcref the function will be found by {name},
+--- also when it was redefined later. Use |funcref()| to keep the
+--- same function.
+---
+--- When {arglist} or {dict} is present this creates a partial.
+--- That means the argument list and/or the dictionary is stored in
+--- the Funcref and will be used when the Funcref is called.
+---
+--- The arguments are passed to the function in front of other
+--- arguments, but after any argument from |method|.  Example: >vim
+---   func Callback(arg1, arg2, name)
+---   "...
+---   endfunc
+---   let Partial = function('Callback', ['one', 'two'])
+---   "...
+---   call Partial('name')
+--- <Invokes the function as with: >vim
+---   call Callback('one', 'two', 'name')
+---
+--- <With a |method|: >vim
+---   func Callback(one, two, three)
+---   "...
+---   endfunc
+---   let Partial = function('Callback', ['two'])
+---   "...
+---   eval 'one'->Partial('three')
+--- <Invokes the function as with: >vim
+---   call Callback('one', 'two', 'three')
+---
+--- <The function() call can be nested to add more arguments to the
+--- Funcref.  The extra arguments are appended to the list of
+--- arguments.  Example: >vim
+---   func Callback(arg1, arg2, name)
+---   "...
+---   endfunc
+---   let Func = function('Callback', ['one'])
+---   let Func2 = function(Func, ['two'])
+---   "...
+---   call Func2('name')
+--- <Invokes the function as with: >vim
+---   call Callback('one', 'two', 'name')
+---
+--- <The Dictionary is only useful when calling a "dict" function.
+--- In that case the {dict} is passed in as "self". Example: >vim
+---   function Callback() dict
+---      echo "called for " .. self.name
+---   endfunction
+---   "...
+---   let context = {"name": "example"}
+---   let Func = function('Callback', context)
+---   "...
+---   call Func()  " will echo: called for example
+--- <The use of function() is not needed when there are no extra
+--- arguments, these two are equivalent, if Callback() is defined
+--- as context.Callback(): >vim
+---   let Func = function('Callback', context)
+---   let Func = context.Callback
+---
+--- <The argument list and the Dictionary can be combined: >vim
+---   function Callback(arg1, count) dict
+---   "...
+---   endfunction
+---   let context = {"name": "example"}
+---   let Func = function('Callback', ['one'], context)
+---   "...
+---   call Func(500)
+--- <Invokes the function as with: >vim
+---   call context.Callback('one', 500)
+--- <
+--- Returns 0 on error.
+---
+--- @param name string
+--- @param arglist? any
+--- @param dict? any
+--- @return any
+vim.fn['function'] = function(name, arglist, dict) end
+
+--- Cleanup unused |Lists| and |Dictionaries| that have circular
+--- references.
+---
+--- There is hardly ever a need to invoke this function, as it is
+--- automatically done when Vim runs out of memory or is waiting
+--- for the user to press a key after 'updatetime'.  Items without
+--- circular references are always freed when they become unused.
+--- This is useful if you have deleted a very big |List| and/or
+--- |Dictionary| with circular references in a script that runs
+--- for a long time.
+---
+--- When the optional {atexit} argument is one, garbage
+--- collection will also be done when exiting Vim, if it wasn't
+--- done before.  This is useful when checking for memory leaks.
+---
+--- The garbage collection is not done immediately but only when
+--- it's safe to perform.  This is when waiting for the user to
+--- type a character.
+---
+--- @param atexit? any
+--- @return any
+function vim.fn.garbagecollect(atexit) end
+
+--- Get item {idx} from |List| {list}.  When this item is not
+--- available return {default}.  Return zero when {default} is
+--- omitted.
+---
+--- @param list any[]
+--- @param idx integer
+--- @param default? any
+--- @return any
+function vim.fn.get(list, idx, default) end
+
+--- Get byte {idx} from |Blob| {blob}.  When this byte is not
+--- available return {default}.  Return -1 when {default} is
+--- omitted.
+---
+--- @param blob string
+--- @param idx integer
+--- @param default? any
+--- @return any
+function vim.fn.get(blob, idx, default) end
+
+--- Get item with key {key} from |Dictionary| {dict}.  When this
+--- item is not available return {default}.  Return zero when
+--- {default} is omitted.  Useful example: >vim
+---   let val = get(g:, 'var_name', 'default')
+--- <This gets the value of g:var_name if it exists, and uses
+--- "default" when it does not exist.
+---
+--- @param dict table<string,any>
+--- @param key string
+--- @param default? any
+--- @return any
+function vim.fn.get(dict, key, default) end
+
+--- Get item {what} from Funcref {func}.  Possible values for
+--- {what} are:
+---   "name"  The function name
+---   "func"  The function
+---   "dict"  The dictionary
+---   "args"  The list with arguments
+--- Returns zero on error.
+---
+--- @param func function
+--- @param what string
+--- @return any
+function vim.fn.get(func, what) end
+
+--- @param buf? integer|string
+--- @return vim.fn.getbufinfo.ret.item[]
+function vim.fn.getbufinfo(buf) end
+
+--- Get information about buffers as a List of Dictionaries.
+---
+--- Without an argument information about all the buffers is
+--- returned.
+---
+--- When the argument is a |Dictionary| only the buffers matching
+--- the specified criteria are returned.  The following keys can
+--- be specified in {dict}:
+---   buflisted  include only listed buffers.
+---   bufloaded  include only loaded buffers.
+---   bufmodified  include only modified buffers.
+---
+--- Otherwise, {buf} specifies a particular buffer to return
+--- information for.  For the use of {buf}, see |bufname()|
+--- above.  If the buffer is found the returned List has one item.
+--- Otherwise the result is an empty list.
+---
+--- Each returned List item is a dictionary with the following
+--- entries:
+---   bufnr    Buffer number.
+---   changed    TRUE if the buffer is modified.
+---   changedtick  Number of changes made to the buffer.
+---   hidden    TRUE if the buffer is hidden.
+---   lastused  Timestamp in seconds, like
+---       |localtime()|, when the buffer was
+---       last used.
+---   listed    TRUE if the buffer is listed.
+---   lnum    Line number used for the buffer when
+---       opened in the current window.
+---       Only valid if the buffer has been
+---       displayed in the window in the past.
+---       If you want the line number of the
+---       last known cursor position in a given
+---       window, use |line()|: >vim
+---         echo line('.', {winid})
+--- <
+---   linecount  Number of lines in the buffer (only
+---       valid when loaded)
+---   loaded    TRUE if the buffer is loaded.
+---   name    Full path to the file in the buffer.
+---   signs    List of signs placed in the buffer.
+---       Each list item is a dictionary with
+---       the following fields:
+---           id    sign identifier
+---           lnum  line number
+---           name  sign name
+---   variables  A reference to the dictionary with
+---       buffer-local variables.
+---   windows    List of |window-ID|s that display this
+---       buffer
+---
+--- Examples: >vim
+---   for buf in getbufinfo()
+---       echo buf.name
+---   endfor
+---   for buf in getbufinfo({'buflisted':1})
+---       if buf.changed
+---     " ....
+---       endif
+---   endfor
+--- <
+--- To get buffer-local options use: >vim
+---   getbufvar({bufnr}, '&option_name')
+--- <
+---
+--- @param dict? vim.fn.getbufinfo.dict
+--- @return vim.fn.getbufinfo.ret.item[]
+function vim.fn.getbufinfo(dict) end
+
+--- Return a |List| with the lines starting from {lnum} to {end}
+--- (inclusive) in the buffer {buf}.  If {end} is omitted, a
+--- |List| with only the line {lnum} is returned.  See
+--- `getbufoneline()` for only getting the line.
+---
+--- For the use of {buf}, see |bufname()| above.
+---
+--- For {lnum} and {end} "$" can be used for the last line of the
+--- buffer.  Otherwise a number must be used.
+---
+--- When {lnum} is smaller than 1 or bigger than the number of
+--- lines in the buffer, an empty |List| is returned.
+---
+--- When {end} is greater than the number of lines in the buffer,
+--- it is treated as {end} is set to the number of lines in the
+--- buffer.  When {end} is before {lnum} an empty |List| is
+--- returned.
+---
+--- This function works only for loaded buffers.  For unloaded and
+--- non-existing buffers, an empty |List| is returned.
+---
+--- Example: >vim
+---   let lines = getbufline(bufnr("myfile"), 1, "$")
+---
+--- @param buf any
+--- @param lnum integer
+--- @param end_? integer
+--- @return any
+function vim.fn.getbufline(buf, lnum, end_) end
+
+--- Just like `getbufline()` but only get one line and return it
+--- as a string.
+---
+--- @param buf integer|string
+--- @param lnum integer
+--- @return string
+function vim.fn.getbufoneline(buf, lnum) end
+
+--- The result is the value of option or local buffer variable
+--- {varname} in buffer {buf}.  Note that the name without "b:"
+--- must be used.
+--- The {varname} argument is a string.
+--- When {varname} is empty returns a |Dictionary| with all the
+--- buffer-local variables.
+--- When {varname} is equal to "&" returns a |Dictionary| with all
+--- the buffer-local options.
+--- Otherwise, when {varname} starts with "&" returns the value of
+--- a buffer-local option.
+--- This also works for a global or buffer-local option, but it
+--- doesn't work for a global variable, window-local variable or
+--- window-local option.
+--- For the use of {buf}, see |bufname()| above.
+--- When the buffer or variable doesn't exist {def} or an empty
+--- string is returned, there is no error message.
+--- Examples: >vim
+---   let bufmodified = getbufvar(1, "&mod")
+---   echo "todo myvar = " .. getbufvar("todo", "myvar")
+---
+--- @param buf any
+--- @param varname string
+--- @param def? any
+--- @return any
+function vim.fn.getbufvar(buf, varname, def) end
+
+--- Returns a |List| of cell widths of character ranges overridden
+--- by |setcellwidths()|.  The format is equal to the argument of
+--- |setcellwidths()|.  If no character ranges have their cell
+--- widths overridden, an empty List is returned.
+---
+--- @return any
+function vim.fn.getcellwidths() end
+
+--- Returns the |changelist| for the buffer {buf}. For the use
+--- of {buf}, see |bufname()| above. If buffer {buf} doesn't
+--- exist, an empty list is returned.
+---
+--- The returned list contains two entries: a list with the change
+--- locations and the current position in the list.  Each
+--- entry in the change list is a dictionary with the following
+--- entries:
+---   col    column number
+---   coladd    column offset for 'virtualedit'
+---   lnum    line number
+--- If buffer {buf} is the current buffer, then the current
+--- position refers to the position in the list. For other
+--- buffers, it is set to the length of the list.
+---
+--- @param buf? integer|string
+--- @return table[]
+function vim.fn.getchangelist(buf) end
+
+--- Get a single character from the user or input stream.
+--- If [expr] is omitted, wait until a character is available.
+--- If [expr] is 0, only get a character when one is available.
+---   Return zero otherwise.
+--- If [expr] is 1, only check if a character is available, it is
+---   not consumed.  Return zero if no character available.
+--- If you prefer always getting a string use |getcharstr()|.
+---
+--- Without [expr] and when [expr] is 0 a whole character or
+--- special key is returned.  If it is a single character, the
+--- result is a Number.  Use |nr2char()| to convert it to a String.
+--- Otherwise a String is returned with the encoded character.
+--- For a special key it's a String with a sequence of bytes
+--- starting with 0x80 (decimal: 128).  This is the same value as
+--- the String "\<Key>", e.g., "\<Left>".  The returned value is
+--- also a String when a modifier (shift, control, alt) was used
+--- that is not included in the character.
+---
+--- When [expr] is 0 and Esc is typed, there will be a short delay
+--- while Vim waits to see if this is the start of an escape
+--- sequence.
+---
+--- When [expr] is 1 only the first byte is returned.  For a
+--- one-byte character it is the character itself as a number.
+--- Use nr2char() to convert it to a String.
+---
+--- Use getcharmod() to obtain any additional modifiers.
+---
+--- When the user clicks a mouse button, the mouse event will be
+--- returned.  The position can then be found in |v:mouse_col|,
+--- |v:mouse_lnum|, |v:mouse_winid| and |v:mouse_win|.
+--- |getmousepos()| can also be used.  Mouse move events will be
+--- ignored.
+--- This example positions the mouse as it would normally happen: >vim
+---   let c = getchar()
+---   if c == "\<LeftMouse>" && v:mouse_win > 0
+---     exe v:mouse_win .. "wincmd w"
+---     exe v:mouse_lnum
+---     exe "normal " .. v:mouse_col .. "|"
+---   endif
+--- <
+--- There is no prompt, you will somehow have to make clear to the
+--- user that a character has to be typed.  The screen is not
+--- redrawn, e.g. when resizing the window.
+---
+--- There is no mapping for the character.
+--- Key codes are replaced, thus when the user presses the <Del>
+--- key you get the code for the <Del> key, not the raw character
+--- sequence.  Examples: >vim
+---   getchar() == "\<Del>"
+---   getchar() == "\<S-Left>"
+--- <This example redefines "f" to ignore case: >vim
+---   nmap f :call FindChar()<CR>
+---   function FindChar()
+---     let c = nr2char(getchar())
+---     while col('.') < col('$') - 1
+---       normal l
+---       if getline('.')[col('.') - 1] ==? c
+---         break
+---       endif
+---     endwhile
+---   endfunction
+--- <
+---
+--- @return integer
+function vim.fn.getchar() end
+
+--- The result is a Number which is the state of the modifiers for
+--- the last obtained character with getchar() or in another way.
+--- These values are added together:
+---   2  shift
+---   4  control
+---   8  alt (meta)
+---   16  meta (when it's different from ALT)
+---   32  mouse double click
+---   64  mouse triple click
+---   96  mouse quadruple click (== 32 + 64)
+---   128  command (Macintosh only)
+--- Only the modifiers that have not been included in the
+--- character itself are obtained.  Thus Shift-a results in "A"
+--- without a modifier.  Returns 0 if no modifiers are used.
+---
+--- @return integer
+function vim.fn.getcharmod() end
+
+--- Get the position for String {expr}. Same as |getpos()| but the
+--- column number in the returned List is a character index
+--- instead of a byte index.
+--- If |getpos()| returns a very large column number, equal to
+--- |v:maxcol|, then getcharpos() will return the character index
+--- of the last character.
+---
+--- Example:
+--- With the cursor on '세' in line 5 with text "여보세요": >vim
+---   getcharpos('.')    returns [0, 5, 3, 0]
+---   getpos('.')    returns [0, 5, 7, 0]
+--- <
+---
+--- @param expr any
+--- @return integer[]
+function vim.fn.getcharpos(expr) end
+
+--- Return the current character search information as a {dict}
+--- with the following entries:
+---
+---     char  character previously used for a character
+---     search (|t|, |f|, |T|, or |F|); empty string
+---     if no character search has been performed
+---     forward  direction of character search; 1 for forward,
+---     0 for backward
+---     until  type of character search; 1 for a |t| or |T|
+---     character search, 0 for an |f| or |F|
+---     character search
+---
+--- This can be useful to always have |;| and |,| search
+--- forward/backward regardless of the direction of the previous
+--- character search: >vim
+---   nnoremap <expr> ; getcharsearch().forward ? ';' : ','
+---   nnoremap <expr> , getcharsearch().forward ? ',' : ';'
+--- <Also see |setcharsearch()|.
+---
+--- @return table[]
+function vim.fn.getcharsearch() end
+
+--- Get a single character from the user or input stream as a
+--- string.
+--- If [expr] is omitted, wait until a character is available.
+--- If [expr] is 0 or false, only get a character when one is
+---   available.  Return an empty string otherwise.
+--- If [expr] is 1 or true, only check if a character is
+---   available, it is not consumed.  Return an empty string
+---   if no character is available.
+--- Otherwise this works like |getchar()|, except that a number
+--- result is converted to a string.
+---
+--- @return string
+function vim.fn.getcharstr() end
+
+--- Return the type of the current command-line completion.
+--- Only works when the command line is being edited, thus
+--- requires use of |c_CTRL-\_e| or |c_CTRL-R_=|.
+--- See |:command-completion| for the return string.
+--- Also see |getcmdtype()|, |setcmdpos()|, |getcmdline()| and
+--- |setcmdline()|.
+--- Returns an empty string when completion is not defined.
+---
+--- @return string
+function vim.fn.getcmdcompltype() end
+
+--- Return the current command-line.  Only works when the command
+--- line is being edited, thus requires use of |c_CTRL-\_e| or
+--- |c_CTRL-R_=|.
+--- Example: >vim
+---   cmap <F7> <C-\>eescape(getcmdline(), ' \')<CR>
+--- <Also see |getcmdtype()|, |getcmdpos()|, |setcmdpos()| and
+--- |setcmdline()|.
+--- Returns an empty string when entering a password or using
+--- |inputsecret()|.
+---
+--- @return string
+function vim.fn.getcmdline() end
+
+--- Return the position of the cursor in the command line as a
+--- byte count.  The first column is 1.
+--- Only works when editing the command line, thus requires use of
+--- |c_CTRL-\_e| or |c_CTRL-R_=| or an expression mapping.
+--- Returns 0 otherwise.
+--- Also see |getcmdtype()|, |setcmdpos()|, |getcmdline()| and
+--- |setcmdline()|.
+---
+--- @return integer
+function vim.fn.getcmdpos() end
+
+--- Return the screen position of the cursor in the command line
+--- as a byte count.  The first column is 1.
+--- Instead of |getcmdpos()|, it adds the prompt position.
+--- Only works when editing the command line, thus requires use of
+--- |c_CTRL-\_e| or |c_CTRL-R_=| or an expression mapping.
+--- Returns 0 otherwise.
+--- Also see |getcmdpos()|, |setcmdpos()|, |getcmdline()| and
+--- |setcmdline()|.
+---
+--- @return any
+function vim.fn.getcmdscreenpos() end
+
+--- Return the current command-line type. Possible return values
+--- are:
+---     :  normal Ex command
+---     >  debug mode command |debug-mode|
+---     /  forward search command
+---     ?  backward search command
+---     \@  |input()| command
+---     `-`  |:insert| or |:append| command
+---     =  |i_CTRL-R_=|
+--- Only works when editing the command line, thus requires use of
+--- |c_CTRL-\_e| or |c_CTRL-R_=| or an expression mapping.
+--- Returns an empty string otherwise.
+--- Also see |getcmdpos()|, |setcmdpos()| and |getcmdline()|.
+---
+--- @return ':'|'>'|'/'|'?'|'@'|'-'|'='
+function vim.fn.getcmdtype() end
+
+--- Return the current |command-line-window| type. Possible return
+--- values are the same as |getcmdtype()|. Returns an empty string
+--- when not in the command-line window.
+---
+--- @return ':'|'>'|'/'|'?'|'@'|'-'|'='
+function vim.fn.getcmdwintype() end
+
+--- Return a list of command-line completion matches. The String
+--- {type} argument specifies what for.  The following completion
+--- types are supported:
+---
+--- arglist    file names in argument list
+--- augroup    autocmd groups
+--- buffer    buffer names
+--- breakpoint  |:breakadd| and |:breakdel| suboptions
+--- cmdline    |cmdline-completion| result
+--- color    color schemes
+--- command    Ex command
+--- compiler  compilers
+--- custom,{func}  custom completion, defined via {func}
+--- customlist,{func} custom completion, defined via {func}
+--- diff_buffer  |:diffget| and |:diffput| completion
+--- dir    directory names
+--- environment  environment variable names
+--- event    autocommand events
+--- expression  Vim expression
+--- file    file and directory names
+--- file_in_path  file and directory names in |'path'|
+--- filetype  filetype names |'filetype'|
+--- function  function name
+--- help    help subjects
+--- highlight  highlight groups
+--- history    |:history| suboptions
+--- locale    locale names (as output of locale -a)
+--- mapclear  buffer argument
+--- mapping    mapping name
+--- menu    menus
+--- messages  |:messages| suboptions
+--- option    options
+--- packadd    optional package |pack-add| names
+--- runtime    |:runtime| completion
+--- scriptnames  sourced script names |:scriptnames|
+--- shellcmd  Shell command
+--- sign    |:sign| suboptions
+--- syntax    syntax file names |'syntax'|
+--- syntime    |:syntime| suboptions
+--- tag    tags
+--- tag_listfiles  tags, file names
+--- user    user names
+--- var    user variables
+---
+--- If {pat} is an empty string, then all the matches are
+--- returned.  Otherwise only items matching {pat} are returned.
+--- See |wildcards| for the use of special characters in {pat}.
+---
+--- If the optional {filtered} flag is set to 1, then 'wildignore'
+--- is applied to filter the results.  Otherwise all the matches
+--- are returned. The 'wildignorecase' option always applies.
+---
+--- If the 'wildoptions' option contains "fuzzy", then fuzzy
+--- matching is used to get the completion matches. Otherwise
+--- regular expression matching is used.  Thus this function
+--- follows the user preference, what happens on the command line.
+--- If you do not want this you can make 'wildoptions' empty
+--- before calling getcompletion() and restore it afterwards.
+---
+--- If {type} is "cmdline", then the |cmdline-completion| result is
+--- returned.  For example, to complete the possible values after
+--- a ":call" command: >vim
+---   echo getcompletion('call ', 'cmdline')
+--- <
+--- If there are no matches, an empty list is returned.  An
+--- invalid value for {type} produces an error.
+---
+--- @param pat any
+--- @param type any
+--- @param filtered? any
+--- @return string[]
+function vim.fn.getcompletion(pat, type, filtered) end
+
+--- Get the position of the cursor.  This is like getpos('.'), but
+--- includes an extra "curswant" item in the list:
+---     [0, lnum, col, off, curswant] ~
+--- The "curswant" number is the preferred column when moving the
+--- cursor vertically.  After |$| command it will be a very large
+--- number equal to |v:maxcol|.  Also see |getcursorcharpos()| and
+--- |getpos()|.
+--- The first "bufnum" item is always zero. The byte position of
+--- the cursor is returned in "col". To get the character
+--- position, use |getcursorcharpos()|.
+---
+--- The optional {winid} argument can specify the window.  It can
+--- be the window number or the |window-ID|.  The last known
+--- cursor position is returned, this may be invalid for the
+--- current value of the buffer if it is not the current window.
+--- If {winid} is invalid a list with zeroes is returned.
+---
+--- This can be used to save and restore the cursor position: >vim
+---   let save_cursor = getcurpos()
+---   MoveTheCursorAround
+---   call setpos('.', save_cursor)
+--- <Note that this only works within the window.  See
+--- |winrestview()| for restoring more state.
+---
+--- @param winid? integer
+--- @return any
+function vim.fn.getcurpos(winid) end
+
+--- Same as |getcurpos()| but the column number in the returned
+--- List is a character index instead of a byte index.
+---
+--- Example:
+--- With the cursor on '보' in line 3 with text "여보세요": >vim
+---   getcursorcharpos()  " returns [0, 3, 2, 0, 3]
+---   getcurpos()    " returns [0, 3, 4, 0, 3]
+--- <
+---
+--- @param winid? integer
+--- @return any
+function vim.fn.getcursorcharpos(winid) end
+
+--- With no arguments, returns the name of the effective
+--- |current-directory|. With {winnr} or {tabnr} the working
+--- directory of that scope is returned, and 'autochdir' is
+--- ignored.
+--- Tabs and windows are identified by their respective numbers,
+--- 0 means current tab or window. Missing tab number implies 0.
+--- Thus the following are equivalent: >vim
+---   getcwd(0)
+---   getcwd(0, 0)
+--- <If {winnr} is -1 it is ignored, only the tab is resolved.
+--- {winnr} can be the window number or the |window-ID|.
+--- If both {winnr} and {tabnr} are -1 the global working
+--- directory is returned.
+--- Throw error if the arguments are invalid. |E5000| |E5001| |E5002|
+---
+--- @param winnr? integer
+--- @param tabnr? integer
+--- @return string
+function vim.fn.getcwd(winnr, tabnr) end
+
+--- Return the value of environment variable {name}.  The {name}
+--- argument is a string, without a leading '$'.  Example: >vim
+---   myHome = getenv('HOME')
+---
+--- <When the variable does not exist |v:null| is returned.  That
+--- is different from a variable set to an empty string.
+--- See also |expr-env|.
+---
+--- @param name string
+--- @return string
+function vim.fn.getenv(name) end
+
+--- Without an argument returns the name of the normal font being
+--- used.  Like what is used for the Normal highlight group
+--- |hl-Normal|.
+--- With an argument a check is done whether String {name} is a
+--- valid font name.  If not then an empty string is returned.
+--- Otherwise the actual font name is returned, or {name} if the
+--- GUI does not support obtaining the real name.
+--- Only works when the GUI is running, thus not in your vimrc or
+--- gvimrc file.  Use the |GUIEnter| autocommand to use this
+--- function just after the GUI has started.
+---
+--- @param name? string
+--- @return string
+function vim.fn.getfontname(name) end
+
+--- The result is a String, which is the read, write, and execute
+--- permissions of the given file {fname}.
+--- If {fname} does not exist or its directory cannot be read, an
+--- empty string is returned.
+--- The result is of the form "rwxrwxrwx", where each group of
+--- "rwx" flags represent, in turn, the permissions of the owner
+--- of the file, the group the file belongs to, and other users.
+--- If a user does not have a given permission the flag for this
+--- is replaced with the string "-".  Examples: >vim
+---   echo getfperm("/etc/passwd")
+---   echo getfperm(expand("~/.config/nvim/init.vim"))
+--- <This will hopefully (from a security point of view) display
+--- the string "rw-r--r--" or even "rw-------".
+---
+--- For setting permissions use |setfperm()|.
+---
+--- @param fname string
+--- @return string
+function vim.fn.getfperm(fname) end
+
+--- The result is a Number, which is the size in bytes of the
+--- given file {fname}.
+--- If {fname} is a directory, 0 is returned.
+--- If the file {fname} can't be found, -1 is returned.
+--- If the size of {fname} is too big to fit in a Number then -2
+--- is returned.
+---
+--- @param fname string
+--- @return integer
+function vim.fn.getfsize(fname) end
+
+--- The result is a Number, which is the last modification time of
+--- the given file {fname}.  The value is measured as seconds
+--- since 1st Jan 1970, and may be passed to strftime().  See also
+--- |localtime()| and |strftime()|.
+--- If the file {fname} can't be found -1 is returned.
+---
+--- @param fname string
+--- @return integer
+function vim.fn.getftime(fname) end
+
+--- The result is a String, which is a description of the kind of
+--- file of the given file {fname}.
+--- If {fname} does not exist an empty string is returned.
+--- Here is a table over different kinds of files and their
+--- results:
+---   Normal file    "file"
+---   Directory    "dir"
+---   Symbolic link    "link"
+---   Block device    "bdev"
+---   Character device  "cdev"
+---   Socket      "socket"
+---   FIFO      "fifo"
+---   All other    "other"
+--- Example: >vim
+---   getftype("/home")
+--- <Note that a type such as "link" will only be returned on
+--- systems that support it.  On some systems only "dir" and
+--- "file" are returned.
+---
+--- @param fname string
+--- @return 'file'|'dir'|'link'|'bdev'|'cdev'|'socket'|'fifo'|'other'
+function vim.fn.getftype(fname) end
+
+--- Returns the |jumplist| for the specified window.
+---
+--- Without arguments use the current window.
+--- With {winnr} only use this window in the current tab page.
+--- {winnr} can also be a |window-ID|.
+--- With {winnr} and {tabnr} use the window in the specified tab
+--- page.  If {winnr} or {tabnr} is invalid, an empty list is
+--- returned.
+---
+--- The returned list contains two entries: a list with the jump
+--- locations and the last used jump position number in the list.
+--- Each entry in the jump location list is a dictionary with
+--- the following entries:
+---   bufnr    buffer number
+---   col    column number
+---   coladd    column offset for 'virtualedit'
+---   filename  filename if available
+---   lnum    line number
+---
+--- @param winnr? integer
+--- @param tabnr? integer
+--- @return vim.fn.getjumplist.ret
+function vim.fn.getjumplist(winnr, tabnr) end
+
+--- Without {end} the result is a String, which is line {lnum}
+--- from the current buffer.  Example: >vim
+---   getline(1)
+--- <When {lnum} is a String that doesn't start with a
+--- digit, |line()| is called to translate the String into a Number.
+--- To get the line under the cursor: >vim
+---   getline(".")
+--- <When {lnum} is a number smaller than 1 or bigger than the
+--- number of lines in the buffer, an empty string is returned.
+---
+--- When {end} is given the result is a |List| where each item is
+--- a line from the current buffer in the range {lnum} to {end},
+--- including line {end}.
+--- {end} is used in the same way as {lnum}.
+--- Non-existing lines are silently omitted.
+--- When {end} is before {lnum} an empty |List| is returned.
+--- Example: >vim
+---   let start = line('.')
+---   let end = search("^$") - 1
+---   let lines = getline(start, end)
+---
+--- <To get lines from another buffer see |getbufline()| and
+--- |getbufoneline()|
+---
+--- @param lnum integer
+--- @param end_? any
+--- @return string|string[]
+function vim.fn.getline(lnum, end_) end
+
+--- Returns a |List| with all the entries in the location list for
+--- window {nr}.  {nr} can be the window number or the |window-ID|.
+--- When {nr} is zero the current window is used.
+---
+--- For a location list window, the displayed location list is
+--- returned.  For an invalid window number {nr}, an empty list is
+--- returned. Otherwise, same as |getqflist()|.
+---
+--- If the optional {what} dictionary argument is supplied, then
+--- returns the items listed in {what} as a dictionary. Refer to
+--- |getqflist()| for the supported items in {what}.
+---
+--- In addition to the items supported by |getqflist()| in {what},
+--- the following item is supported by |getloclist()|:
+---
+---   filewinid  id of the window used to display files
+---       from the location list. This field is
+---       applicable only when called from a
+---       location list window. See
+---       |location-list-file-window| for more
+---       details.
+---
+--- Returns a |Dictionary| with default values if there is no
+--- location list for the window {nr}.
+--- Returns an empty Dictionary if window {nr} does not exist.
+---
+--- Examples (See also |getqflist-examples|): >vim
+---   echo getloclist(3, {'all': 0})
+---   echo getloclist(5, {'filewinid': 0})
+--- <
+---
+--- @param nr integer
+--- @param what? any
+--- @return any
+function vim.fn.getloclist(nr, what) end
+
+--- Without the {buf} argument returns a |List| with information
+--- about all the global marks. |mark|
+---
+--- If the optional {buf} argument is specified, returns the
+--- local marks defined in buffer {buf}.  For the use of {buf},
+--- see |bufname()|.  If {buf} is invalid, an empty list is
+--- returned.
+---
+--- Each item in the returned List is a |Dict| with the following:
+---     mark   name of the mark prefixed by "'"
+---     pos     a |List| with the position of the mark:
+---     [bufnum, lnum, col, off]
+---      Refer to |getpos()| for more information.
+---     file   file name
+---
+--- Refer to |getpos()| for getting information about a specific
+--- mark.
+---
+--- @param buf? any
+--- @return any
+function vim.fn.getmarklist(buf) end
+
+--- Returns a |List| with all matches previously defined for the
+--- current window by |matchadd()| and the |:match| commands.
+--- |getmatches()| is useful in combination with |setmatches()|,
+--- as |setmatches()| can restore a list of matches saved by
+--- |getmatches()|.
+--- If {win} is specified, use the window with this number or
+--- window ID instead of the current window.  If {win} is invalid,
+--- an empty list is returned.
+--- Example: >vim
+---   echo getmatches()
+--- < >
+---   [{"group": "MyGroup1", "pattern": "TODO",
+---   "priority": 10, "id": 1}, {"group": "MyGroup2",
+---   "pattern": "FIXME", "priority": 10, "id": 2}]
+--- < >vim
+---   let m = getmatches()
+---   call clearmatches()
+---   echo getmatches()
+--- < >
+---   []
+--- < >vim
+---   call setmatches(m)
+---   echo getmatches()
+--- < >
+---   [{"group": "MyGroup1", "pattern": "TODO",
+---   "priority": 10, "id": 1}, {"group": "MyGroup2",
+---   "pattern": "FIXME", "priority": 10, "id": 2}]
+--- < >vim
+---   unlet m
+--- <
+---
+--- @param win? any
+--- @return any
+function vim.fn.getmatches(win) end
+
+--- Returns a |Dictionary| with the last known position of the
+--- mouse.  This can be used in a mapping for a mouse click.  The
+--- items are:
+---   screenrow  screen row
+---   screencol  screen column
+---   winid    Window ID of the click
+---   winrow    row inside "winid"
+---   wincol    column inside "winid"
+---   line    text line inside "winid"
+---   column    text column inside "winid"
+---   coladd    offset (in screen columns) from the
+---       start of the clicked char
+--- All numbers are 1-based.
+---
+--- If not over a window, e.g. when in the command line, then only
+--- "screenrow" and "screencol" are valid, the others are zero.
+---
+--- When on the status line below a window or the vertical
+--- separator right of a window, the "line" and "column" values
+--- are zero.
+---
+--- When the position is after the text then "column" is the
+--- length of the text in bytes plus one.
+---
+--- If the mouse is over a focusable floating window then that
+--- window is used.
+---
+--- When using |getchar()| the Vim variables |v:mouse_lnum|,
+--- |v:mouse_col| and |v:mouse_winid| also provide these values.
+---
+--- @return vim.fn.getmousepos.ret
+function vim.fn.getmousepos() end
+
+--- Return a Number which is the process ID of the Vim process.
+--- This is a unique number, until Vim exits.
+---
+--- @return integer
+function vim.fn.getpid() end
+
+--- Get the position for String {expr}.  For possible values of
+--- {expr} see |line()|.  For getting the cursor position see
+--- |getcurpos()|.
+--- The result is a |List| with four numbers:
+---     [bufnum, lnum, col, off]
+--- "bufnum" is zero, unless a mark like '0 or 'A is used, then it
+--- is the buffer number of the mark.
+--- "lnum" and "col" are the position in the buffer.  The first
+--- column is 1.
+--- The "off" number is zero, unless 'virtualedit' is used.  Then
+--- it is the offset in screen columns from the start of the
+--- character.  E.g., a position within a <Tab> or after the last
+--- character.
+--- Note that for '< and '> Visual mode matters: when it is "V"
+--- (visual line mode) the column of '< is zero and the column of
+--- '> is a large number equal to |v:maxcol|.
+--- The column number in the returned List is the byte position
+--- within the line. To get the character position in the line,
+--- use |getcharpos()|.
+--- A very large column number equal to |v:maxcol| can be returned,
+--- in which case it means "after the end of the line".
+--- If {expr} is invalid, returns a list with all zeros.
+--- This can be used to save and restore the position of a mark: >vim
+---   let save_a_mark = getpos("'a")
+---   " ...
+---   call setpos("'a", save_a_mark)
+--- <Also see |getcharpos()|, |getcurpos()| and |setpos()|.
+---
+--- @param expr string
+--- @return integer[]
+function vim.fn.getpos(expr) end
+
+--- Returns a |List| with all the current quickfix errors.  Each
+--- list item is a dictionary with these entries:
+---   bufnr  number of buffer that has the file name, use
+---     bufname() to get the name
+---   module  module name
+---   lnum  line number in the buffer (first line is 1)
+---   end_lnum
+---     end of line number if the item is multiline
+---   col  column number (first column is 1)
+---   end_col  end of column number if the item has range
+---   vcol  |TRUE|: "col" is visual column
+---     |FALSE|: "col" is byte index
+---   nr  error number
+---   pattern  search pattern used to locate the error
+---   text  description of the error
+---   type  type of the error, 'E', '1', etc.
+---   valid  |TRUE|: recognized error message
+---   user_data
+---     custom data associated with the item, can be
+---     any type.
+---
+--- When there is no error list or it's empty, an empty list is
+--- returned. Quickfix list entries with a non-existing buffer
+--- number are returned with "bufnr" set to zero (Note: some
+--- functions accept buffer number zero for the alternate buffer,
+--- you may need to explicitly check for zero).
+---
+--- Useful application: Find pattern matches in multiple files and
+--- do something with them: >vim
+---   vimgrep /theword/jg *.c
+---   for d in getqflist()
+---      echo bufname(d.bufnr) ':' d.lnum '=' d.text
+---   endfor
+--- <
+--- If the optional {what} dictionary argument is supplied, then
+--- returns only the items listed in {what} as a dictionary. The
+--- following string items are supported in {what}:
+---   changedtick  get the total number of changes made
+---       to the list |quickfix-changedtick|
+---   context  get the |quickfix-context|
+---   efm  errorformat to use when parsing "lines". If
+---     not present, then the 'errorformat' option
+---     value is used.
+---   id  get information for the quickfix list with
+---     |quickfix-ID|; zero means the id for the
+---     current list or the list specified by "nr"
+---   idx  get information for the quickfix entry at this
+---     index in the list specified by "id" or "nr".
+---     If set to zero, then uses the current entry.
+---     See |quickfix-index|
+---   items  quickfix list entries
+---   lines  parse a list of lines using 'efm' and return
+---     the resulting entries.  Only a |List| type is
+---     accepted.  The current quickfix list is not
+---     modified. See |quickfix-parse|.
+---   nr  get information for this quickfix list; zero
+---     means the current quickfix list and "$" means
+---     the last quickfix list
+---   qfbufnr number of the buffer displayed in the quickfix
+---     window. Returns 0 if the quickfix buffer is
+---     not present. See |quickfix-buffer|.
+---   size  number of entries in the quickfix list
+---   title  get the list title |quickfix-title|
+---   winid  get the quickfix |window-ID|
+---   all  all of the above quickfix properties
+--- Non-string items in {what} are ignored. To get the value of a
+--- particular item, set it to zero.
+--- If "nr" is not present then the current quickfix list is used.
+--- If both "nr" and a non-zero "id" are specified, then the list
+--- specified by "id" is used.
+--- To get the number of lists in the quickfix stack, set "nr" to
+--- "$" in {what}. The "nr" value in the returned dictionary
+--- contains the quickfix stack size.
+--- When "lines" is specified, all the other items except "efm"
+--- are ignored.  The returned dictionary contains the entry
+--- "items" with the list of entries.
+---
+--- The returned dictionary contains the following entries:
+---   changedtick  total number of changes made to the
+---       list |quickfix-changedtick|
+---   context  quickfix list context. See |quickfix-context|
+---     If not present, set to "".
+---   id  quickfix list ID |quickfix-ID|. If not
+---     present, set to 0.
+---   idx  index of the quickfix entry in the list. If not
+---     present, set to 0.
+---   items  quickfix list entries. If not present, set to
+---     an empty list.
+---   nr  quickfix list number. If not present, set to 0
+---   qfbufnr  number of the buffer displayed in the quickfix
+---     window. If not present, set to 0.
+---   size  number of entries in the quickfix list. If not
+---     present, set to 0.
+---   title  quickfix list title text. If not present, set
+---     to "".
+---   winid  quickfix |window-ID|. If not present, set to 0
+---
+--- Examples (See also |getqflist-examples|): >vim
+---   echo getqflist({'all': 1})
+---   echo getqflist({'nr': 2, 'title': 1})
+---   echo getqflist({'lines' : ["F1:10:L10"]})
+--- <
+---
+--- @param what? any
+--- @return any
+function vim.fn.getqflist(what) end
+
+--- The result is a String, which is the contents of register
+--- {regname}.  Example: >vim
+---   let cliptext = getreg('*')
+--- <When register {regname} was not set the result is an empty
+--- string.
+--- The {regname} argument must be a string.
+---
+--- getreg('=') returns the last evaluated value of the expression
+--- register.  (For use in maps.)
+--- getreg('=', 1) returns the expression itself, so that it can
+--- be restored with |setreg()|.  For other registers the extra
+--- argument is ignored, thus you can always give it.
+---
+--- If {list} is present and |TRUE|, the result type is changed
+--- to |List|. Each list item is one text line. Use it if you care
+--- about zero bytes possibly present inside register: without
+--- third argument both NLs and zero bytes are represented as NLs
+--- (see |NL-used-for-Nul|).
+--- When the register was not set an empty list is returned.
+---
+--- If {regname} is not specified, |v:register| is used.
+---
+--- @param regname? string
+--- @param list? any
+--- @return string|string[]
+function vim.fn.getreg(regname, list) end
+
+--- Returns detailed information about register {regname} as a
+--- Dictionary with the following entries:
+---   regcontents  List of lines contained in register
+---       {regname}, like
+---       getreg({regname}, 1, 1).
+---   regtype    the type of register {regname}, as in
+---       |getregtype()|.
+---   isunnamed  Boolean flag, v:true if this register
+---       is currently pointed to by the unnamed
+---       register.
+---   points_to  for the unnamed register, gives the
+---       single letter name of the register
+---       currently pointed to (see |quotequote|).
+---       For example, after deleting a line
+---       with `dd`, this field will be "1",
+---       which is the register that got the
+---       deleted text.
+---
+--- The {regname} argument is a string.  If {regname} is invalid
+--- or not set, an empty Dictionary will be returned.
+--- If {regname} is not specified, |v:register| is used.
+--- The returned Dictionary can be passed to |setreg()|.
+---
+--- @param regname? string
+--- @return table
+function vim.fn.getreginfo(regname) end
+
+--- The result is a String, which is type of register {regname}.
+--- The value will be one of:
+---     "v"      for |charwise| text
+---     "V"      for |linewise| text
+---     "<CTRL-V>{width}"  for |blockwise-visual| text
+---     ""      for an empty or unknown register
+--- <CTRL-V> is one character with value 0x16.
+--- The {regname} argument is a string.  If {regname} is not
+--- specified, |v:register| is used.
+---
+--- @param regname? string
+--- @return string
+function vim.fn.getregtype(regname) end
+
+--- Returns a |List| with information about all the sourced Vim
+--- scripts in the order they were sourced, like what
+--- `:scriptnames` shows.
+---
+--- The optional Dict argument {opts} supports the following
+--- optional items:
+---     name  Script name match pattern. If specified,
+---     and "sid" is not specified, information about
+---     scripts with a name that match the pattern
+---     "name" are returned.
+---     sid    Script ID |<SID>|.  If specified, only
+---     information about the script with ID "sid" is
+---     returned and "name" is ignored.
+---
+--- Each item in the returned List is a |Dict| with the following
+--- items:
+---     autoload  Always set to FALSE.
+---     functions   List of script-local function names defined in
+---     the script.  Present only when a particular
+---     script is specified using the "sid" item in
+---     {opts}.
+---     name  Vim script file name.
+---     sid    Script ID |<SID>|.
+---     variables   A dictionary with the script-local variables.
+---     Present only when a particular script is
+---     specified using the "sid" item in {opts}.
+---     Note that this is a copy, the value of
+---     script-local variables cannot be changed using
+---     this dictionary.
+---     version  Vim script version, always 1
+---
+--- Examples: >vim
+---   echo getscriptinfo({'name': 'myscript'})
+---   echo getscriptinfo({'sid': 15}).variables
+--- <
+---
+--- @param opts? table
+--- @return any
+function vim.fn.getscriptinfo(opts) end
+
+--- If {tabnr} is not specified, then information about all the
+--- tab pages is returned as a |List|. Each List item is a
+--- |Dictionary|.  Otherwise, {tabnr} specifies the tab page
+--- number and information about that one is returned.  If the tab
+--- page does not exist an empty List is returned.
+---
+--- Each List item is a |Dictionary| with the following entries:
+---   tabnr    tab page number.
+---   variables  a reference to the dictionary with
+---       tabpage-local variables
+---   windows    List of |window-ID|s in the tab page.
+---
+--- @param tabnr? integer
+--- @return any
+function vim.fn.gettabinfo(tabnr) end
+
+--- Get the value of a tab-local variable {varname} in tab page
+--- {tabnr}. |t:var|
+--- Tabs are numbered starting with one.
+--- The {varname} argument is a string.  When {varname} is empty a
+--- dictionary with all tab-local variables is returned.
+--- Note that the name without "t:" must be used.
+--- When the tab or variable doesn't exist {def} or an empty
+--- string is returned, there is no error message.
+---
+--- @param tabnr integer
+--- @param varname string
+--- @param def? any
+--- @return any
+function vim.fn.gettabvar(tabnr, varname, def) end
+
+--- Get the value of window-local variable {varname} in window
+--- {winnr} in tab page {tabnr}.
+--- The {varname} argument is a string.  When {varname} is empty a
+--- dictionary with all window-local variables is returned.
+--- When {varname} is equal to "&" get the values of all
+--- window-local options in a |Dictionary|.
+--- Otherwise, when {varname} starts with "&" get the value of a
+--- window-local option.
+--- Note that {varname} must be the name without "w:".
+--- Tabs are numbered starting with one.  For the current tabpage
+--- use |getwinvar()|.
+--- {winnr} can be the window number or the |window-ID|.
+--- When {winnr} is zero the current window is used.
+--- This also works for a global option, buffer-local option and
+--- window-local option, but it doesn't work for a global variable
+--- or buffer-local variable.
+--- When the tab, window or variable doesn't exist {def} or an
+--- empty string is returned, there is no error message.
+--- Examples: >vim
+---   let list_is_on = gettabwinvar(1, 2, '&list')
+---   echo "myvar = " .. gettabwinvar(3, 1, 'myvar')
+--- <
+--- To obtain all window-local variables use: >vim
+---   gettabwinvar({tabnr}, {winnr}, '&')
+--- <
+---
+--- @param tabnr integer
+--- @param winnr integer
+--- @param varname string
+--- @param def? any
+--- @return any
+function vim.fn.gettabwinvar(tabnr, winnr, varname, def) end
+
+--- The result is a Dict, which is the tag stack of window {winnr}.
+--- {winnr} can be the window number or the |window-ID|.
+--- When {winnr} is not specified, the current window is used.
+--- When window {winnr} doesn't exist, an empty Dict is returned.
+---
+--- The returned dictionary contains the following entries:
+---   curidx    Current index in the stack. When at
+---       top of the stack, set to (length + 1).
+---       Index of bottom of the stack is 1.
+---   items    List of items in the stack. Each item
+---       is a dictionary containing the
+---       entries described below.
+---   length    Number of entries in the stack.
+---
+--- Each item in the stack is a dictionary with the following
+--- entries:
+---   bufnr    buffer number of the current jump
+---   from    cursor position before the tag jump.
+---       See |getpos()| for the format of the
+---       returned list.
+---   matchnr    current matching tag number. Used when
+---       multiple matching tags are found for a
+---       name.
+---   tagname    name of the tag
+---
+--- See |tagstack| for more information about the tag stack.
+---
+--- @param winnr? integer
+--- @return any
+function vim.fn.gettagstack(winnr) end
+
+--- Translate String {text} if possible.
+--- This is mainly for use in the distributed Vim scripts.  When
+--- generating message translations the {text} is extracted by
+--- xgettext, the translator can add the translated message in the
+--- .po file and Vim will lookup the translation when gettext() is
+--- called.
+--- For {text} double quoted strings are preferred, because
+--- xgettext does not understand escaping in single quoted
+--- strings.
+---
+--- @param text any
+--- @return any
+function vim.fn.gettext(text) end
+
+--- Returns information about windows as a |List| with Dictionaries.
+---
+--- If {winid} is given Information about the window with that ID
+--- is returned, as a |List| with one item.  If the window does not
+--- exist the result is an empty list.
+---
+--- Without {winid} information about all the windows in all the
+--- tab pages is returned.
+---
+--- Each List item is a |Dictionary| with the following entries:
+---   botline    last complete displayed buffer line
+---   bufnr    number of buffer in the window
+---   height    window height (excluding winbar)
+---   loclist    1 if showing a location list
+---   quickfix  1 if quickfix or location list window
+---   terminal  1 if a terminal window
+---   tabnr    tab page number
+---   topline    first displayed buffer line
+---   variables  a reference to the dictionary with
+---       window-local variables
+---   width    window width
+---   winbar    1 if the window has a toolbar, 0
+---       otherwise
+---   wincol    leftmost screen column of the window;
+---       "col" from |win_screenpos()|
+---   textoff    number of columns occupied by any
+---       'foldcolumn', 'signcolumn' and line
+---       number in front of the text
+---   winid    |window-ID|
+---   winnr    window number
+---   winrow    topmost screen line of the window;
+---       "row" from |win_screenpos()|
+---
+--- @param winid? integer
+--- @return vim.fn.getwininfo.ret.item[]
+function vim.fn.getwininfo(winid) end
+
+--- The result is a |List| with two numbers, the result of
+--- |getwinposx()| and |getwinposy()| combined:
+---   [x-pos, y-pos]
+--- {timeout} can be used to specify how long to wait in msec for
+--- a response from the terminal.  When omitted 100 msec is used.
+---
+--- Use a longer time for a remote terminal.
+--- When using a value less than 10 and no response is received
+--- within that time, a previously reported position is returned,
+--- if available.  This can be used to poll for the position and
+--- do some work in the meantime: >vim
+---   while 1
+---     let res = getwinpos(1)
+---     if res[0] >= 0
+---       break
+---     endif
+---     " Do some work here
+---   endwhile
+--- <
+---
+--- @param timeout? integer
+--- @return any
+function vim.fn.getwinpos(timeout) end
+
+--- The result is a Number, which is the X coordinate in pixels of
+--- the left hand side of the GUI Vim window.  The result will be
+--- -1 if the information is not available.
+--- The value can be used with `:winpos`.
+---
+--- @return integer
+function vim.fn.getwinposx() end
+
+--- The result is a Number, which is the Y coordinate in pixels of
+--- the top of the GUI Vim window.  The result will be -1 if the
+--- information is not available.
+--- The value can be used with `:winpos`.
+---
+--- @return integer
+function vim.fn.getwinposy() end
+
+--- Like |gettabwinvar()| for the current tabpage.
+--- Examples: >vim
+---   let list_is_on = getwinvar(2, '&list')
+---   echo "myvar = " .. getwinvar(1, 'myvar')
+---
+--- @param winnr integer
+--- @param varname string
+--- @param def? any
+--- @return any
+function vim.fn.getwinvar(winnr, varname, def) end
+
+--- Expand the file wildcards in {expr}.  See |wildcards| for the
+--- use of special characters.
+---
+--- Unless the optional {nosuf} argument is given and is |TRUE|,
+--- the 'suffixes' and 'wildignore' options apply: Names matching
+--- one of the patterns in 'wildignore' will be skipped and
+--- 'suffixes' affect the ordering of matches.
+--- 'wildignorecase' always applies.
+---
+--- When {list} is present and it is |TRUE| the result is a |List|
+--- with all matching files. The advantage of using a List is,
+--- you also get filenames containing newlines correctly.
+--- Otherwise the result is a String and when there are several
+--- matches, they are separated by <NL> characters.
+---
+--- If the expansion fails, the result is an empty String or List.
+---
+--- You can also use |readdir()| if you need to do complicated
+--- things, such as limiting the number of matches.
+---
+--- A name for a non-existing file is not included.  A symbolic
+--- link is only included if it points to an existing file.
+--- However, when the {alllinks} argument is present and it is
+--- |TRUE| then all symbolic links are included.
+---
+--- For most systems backticks can be used to get files names from
+--- any external command.  Example: >vim
+---   let tagfiles = glob("`find . -name tags -print`")
+---   let &tags = substitute(tagfiles, "\n", ",", "g")
+--- <The result of the program inside the backticks should be one
+--- item per line.  Spaces inside an item are allowed.
+---
+--- See |expand()| for expanding special Vim variables.  See
+--- |system()| for getting the raw output of an external command.
+---
+--- @param expr any
+--- @param nosuf? boolean
+--- @param list? any
+--- @param alllinks? any
+--- @return any
+function vim.fn.glob(expr, nosuf, list, alllinks) end
+
+--- Convert a file pattern, as used by glob(), into a search
+--- pattern.  The result can be used to match with a string that
+--- is a file name.  E.g. >vim
+---   if filename =~ glob2regpat('Make*.mak')
+---     " ...
+---   endif
+--- <This is equivalent to: >vim
+---   if filename =~ '^Make.*\.mak$'
+---     " ...
+---   endif
+--- <When {string} is an empty string the result is "^$", match an
+--- empty string.
+--- Note that the result depends on the system.  On MS-Windows
+--- a backslash usually means a path separator.
+---
+--- @param string string
+--- @return any
+function vim.fn.glob2regpat(string) end
+
+--- Perform glob() for String {expr} on all directories in {path}
+--- and concatenate the results.  Example: >vim
+---   echo globpath(&rtp, "syntax/c.vim")
+--- <
+--- {path} is a comma-separated list of directory names.  Each
+--- directory name is prepended to {expr} and expanded like with
+--- |glob()|.  A path separator is inserted when needed.
+--- To add a comma inside a directory name escape it with a
+--- backslash.  Note that on MS-Windows a directory may have a
+--- trailing backslash, remove it if you put a comma after it.
+--- If the expansion fails for one of the directories, there is no
+--- error message.
+---
+--- Unless the optional {nosuf} argument is given and is |TRUE|,
+--- the 'suffixes' and 'wildignore' options apply: Names matching
+--- one of the patterns in 'wildignore' will be skipped and
+--- 'suffixes' affect the ordering of matches.
+---
+--- When {list} is present and it is |TRUE| the result is a |List|
+--- with all matching files. The advantage of using a List is, you
+--- also get filenames containing newlines correctly. Otherwise
+--- the result is a String and when there are several matches,
+--- they are separated by <NL> characters.  Example: >vim
+---   echo globpath(&rtp, "syntax/c.vim", 0, 1)
+--- <
+--- {allinks} is used as with |glob()|.
+---
+--- The "**" item can be used to search in a directory tree.
+--- For example, to find all "README.txt" files in the directories
+--- in 'runtimepath' and below: >vim
+---   echo globpath(&rtp, "**/README.txt")
+--- <Upwards search and limiting the depth of "**" is not
+--- supported, thus using 'path' will not always work properly.
+---
+--- @param path string
+--- @param expr any
+--- @param nosuf? boolean
+--- @param list? any
+--- @param allinks? any
+--- @return any
+function vim.fn.globpath(path, expr, nosuf, list, allinks) end
+
+--- Returns 1 if {feature} is supported, 0 otherwise.  The
+--- {feature} argument is a feature name like "nvim-0.2.1" or
+--- "win32", see below.  See also |exists()|.
+---
+--- To get the system name use |vim.uv|.os_uname() in Lua: >lua
+---   print(vim.uv.os_uname().sysname)
+---
+--- <If the code has a syntax error then Vimscript may skip the
+--- rest of the line.  Put |:if| and |:endif| on separate lines to
+--- avoid the syntax error: >vim
+---   if has('feature')
+---     let x = this_breaks_without_the_feature()
+---   endif
+--- <
+--- Vim's compile-time feature-names (prefixed with "+") are not
+--- recognized because Nvim is always compiled with all possible
+--- features. |feature-compile|
+---
+--- Feature names can be:
+--- 1.  Nvim version. For example the "nvim-0.2.1" feature means
+---     that Nvim is version 0.2.1 or later: >vim
+---   if has("nvim-0.2.1")
+---     " ...
+---   endif
+---
+--- <2.  Runtime condition or other pseudo-feature. For example the
+---     "win32" feature checks if the current system is Windows: >vim
+---   if has("win32")
+---     " ...
+---   endif
+--- <          *feature-list*
+---     List of supported pseudo-feature names:
+---   acl    |ACL| support.
+---   bsd    BSD system (not macOS, use "mac" for that).
+---   clipboard  |clipboard| provider is available.
+---   fname_case  Case in file names matters (for Darwin and MS-Windows
+---       this is not present).
+---   gui_running  Nvim has a GUI.
+---   iconv    Can use |iconv()| for conversion.
+---   linux    Linux system.
+---   mac    MacOS system.
+---   nvim    This is Nvim.
+---   python3    Legacy Vim |python3| interface. |has-python|
+---   pythonx    Legacy Vim |python_x| interface. |has-pythonx|
+---   sun    SunOS system.
+---   ttyin    input is a terminal (tty).
+---   ttyout    output is a terminal (tty).
+---   unix    Unix system.
+---   *vim_starting*  True during |startup|.
+---   win32    Windows system (32 or 64 bit).
+---   win64    Windows system (64 bit).
+---   wsl    WSL (Windows Subsystem for Linux) system.
+---
+---           *has-patch*
+--- 3.  Vim patch. For example the "patch123" feature means that
+---     Vim patch 123 at the current |v:version| was included: >vim
+---   if v:version > 602 || v:version == 602 && has("patch148")
+---     " ...
+---   endif
+---
+--- <4.  Vim version. For example the "patch-7.4.237" feature means
+---     that Nvim is Vim-compatible to version 7.4.237 or later. >vim
+---   if has("patch-7.4.237")
+---     " ...
+---   endif
+--- <
+---
+--- @param feature any
+--- @return 0|1
+function vim.fn.has(feature) end
+
+--- The result is a Number, which is TRUE if |Dictionary| {dict}
+--- has an entry with key {key}.  FALSE otherwise. The {key}
+--- argument is a string.
+---
+--- @param dict any
+--- @param key any
+--- @return 0|1
+function vim.fn.has_key(dict, key) end
+
+--- The result is a Number, which is 1 when the window has set a
+--- local path via |:lcd| or when {winnr} is -1 and the tabpage
+--- has set a local path via |:tcd|, otherwise 0.
+---
+--- Tabs and windows are identified by their respective numbers,
+--- 0 means current tab or window. Missing argument implies 0.
+--- Thus the following are equivalent: >vim
+---   echo haslocaldir()
+---   echo haslocaldir(0)
+---   echo haslocaldir(0, 0)
+--- <With {winnr} use that window in the current tabpage.
+--- With {winnr} and {tabnr} use the window in that tabpage.
+--- {winnr} can be the window number or the |window-ID|.
+--- If {winnr} is -1 it is ignored, only the tab is resolved.
+--- Throw error if the arguments are invalid. |E5000| |E5001| |E5002|
+---
+--- @param winnr? integer
+--- @param tabnr? integer
+--- @return 0|1
+function vim.fn.haslocaldir(winnr, tabnr) end
+
+--- The result is a Number, which is TRUE if there is a mapping
+--- that contains {what} in somewhere in the rhs (what it is
+--- mapped to) and this mapping exists in one of the modes
+--- indicated by {mode}.
+--- The arguments {what} and {mode} are strings.
+--- When {abbr} is there and it is |TRUE| use abbreviations
+--- instead of mappings.  Don't forget to specify Insert and/or
+--- Command-line mode.
+--- Both the global mappings and the mappings local to the current
+--- buffer are checked for a match.
+--- If no matching mapping is found FALSE is returned.
+--- The following characters are recognized in {mode}:
+---   n  Normal mode
+---   v  Visual and Select mode
+---   x  Visual mode
+---   s  Select mode
+---   o  Operator-pending mode
+---   i  Insert mode
+---   l  Language-Argument ("r", "f", "t", etc.)
+---   c  Command-line mode
+--- When {mode} is omitted, "nvo" is used.
+---
+--- This function is useful to check if a mapping already exists
+--- to a function in a Vim script.  Example: >vim
+---   if !hasmapto('\ABCdoit')
+---      map <Leader>d \ABCdoit
+---   endif
+--- <This installs the mapping to "\ABCdoit" only if there isn't
+--- already a mapping to "\ABCdoit".
+---
+--- @param what any
+--- @param mode? string
+--- @param abbr? any
+--- @return 0|1
+function vim.fn.hasmapto(what, mode, abbr) end
+
+--- @deprecated
+--- Obsolete name for |hlID()|.
+---
+--- @param name string
+--- @return any
+function vim.fn.highlightID(name) end
+
+--- @deprecated
+--- Obsolete name for |hlexists()|.
+---
+--- @param name string
+--- @return any
+function vim.fn.highlight_exists(name) end
+
+--- Add the String {item} to the history {history} which can be
+--- one of:          *hist-names*
+---   "cmd"   or ":"    command line history
+---   "search" or "/"   search pattern history
+---   "expr"   or "="   typed expression history
+---   "input"  or "\@"    input line history
+---   "debug"  or ">"   debug command history
+---   empty      the current or last used history
+--- The {history} string does not need to be the whole name, one
+--- character is sufficient.
+--- If {item} does already exist in the history, it will be
+--- shifted to become the newest entry.
+--- The result is a Number: TRUE if the operation was successful,
+--- otherwise FALSE is returned.
+---
+--- Example: >vim
+---   call histadd("input", strftime("%Y %b %d"))
+---   let date=input("Enter date: ")
+--- <This function is not available in the |sandbox|.
+---
+--- @param history any
+--- @param item any
+--- @return 0|1
+function vim.fn.histadd(history, item) end
+
+--- Clear {history}, i.e. delete all its entries.  See |hist-names|
+--- for the possible values of {history}.
+---
+--- If the parameter {item} evaluates to a String, it is used as a
+--- regular expression.  All entries matching that expression will
+--- be removed from the history (if there are any).
+--- Upper/lowercase must match, unless "\c" is used |/\c|.
+--- If {item} evaluates to a Number, it will be interpreted as
+--- an index, see |:history-indexing|.  The respective entry will
+--- be removed if it exists.
+---
+--- The result is TRUE for a successful operation, otherwise FALSE
+--- is returned.
+---
+--- Examples:
+--- Clear expression register history: >vim
+---   call histdel("expr")
+--- <
+--- Remove all entries starting with "*" from the search history: >vim
+---   call histdel("/", '^\*')
+--- <
+--- The following three are equivalent: >vim
+---   call histdel("search", histnr("search"))
+---   call histdel("search", -1)
+---   call histdel("search", '^' .. histget("search", -1) .. '$')
+--- <
+--- To delete the last search pattern and use the last-but-one for
+--- the "n" command and 'hlsearch': >vim
+---   call histdel("search", -1)
+---   let \@/ = histget("search", -1)
+--- <
+---
+--- @param history any
+--- @param item? any
+--- @return 0|1
+function vim.fn.histdel(history, item) end
+
+--- The result is a String, the entry with Number {index} from
+--- {history}.  See |hist-names| for the possible values of
+--- {history}, and |:history-indexing| for {index}.  If there is
+--- no such entry, an empty String is returned.  When {index} is
+--- omitted, the most recent item from the history is used.
+---
+--- Examples:
+--- Redo the second last search from history. >vim
+---   execute '/' .. histget("search", -2)
+---
+--- <Define an Ex command ":H {num}" that supports re-execution of
+--- the {num}th entry from the output of |:history|. >vim
+---   command -nargs=1 H execute histget("cmd", 0+<args>)
+--- <
+---
+--- @param history any
+--- @param index? any
+--- @return string
+function vim.fn.histget(history, index) end
+
+--- The result is the Number of the current entry in {history}.
+--- See |hist-names| for the possible values of {history}.
+--- If an error occurred, -1 is returned.
+---
+--- Example: >vim
+---   let inp_index = histnr("expr")
+---
+--- @param history any
+--- @return integer
+function vim.fn.histnr(history) end
+
+--- The result is a Number, which is the ID of the highlight group
+--- with name {name}.  When the highlight group doesn't exist,
+--- zero is returned.
+--- This can be used to retrieve information about the highlight
+--- group.  For example, to get the background color of the
+--- "Comment" group: >vim
+---   echo synIDattr(synIDtrans(hlID("Comment")), "bg")
+--- <
+---
+--- @param name string
+--- @return integer
+function vim.fn.hlID(name) end
+
+--- The result is a Number, which is TRUE if a highlight group
+--- called {name} exists.  This is when the group has been
+--- defined in some way.  Not necessarily when highlighting has
+--- been defined for it, it may also have been used for a syntax
+--- item.
+---
+--- @param name string
+--- @return 0|1
+function vim.fn.hlexists(name) end
+
+--- The result is a String, which is the name of the machine on
+--- which Vim is currently running.  Machine names greater than
+--- 256 characters long are truncated.
+---
+--- @return string
+function vim.fn.hostname() end
+
+--- The result is a String, which is the text {string} converted
+--- from encoding {from} to encoding {to}.
+--- When the conversion completely fails an empty string is
+--- returned.  When some characters could not be converted they
+--- are replaced with "?".
+--- The encoding names are whatever the iconv() library function
+--- can accept, see ":!man 3 iconv".
+--- Note that Vim uses UTF-8 for all Unicode encodings, conversion
+--- from/to UCS-2 is automatically changed to use UTF-8.  You
+--- cannot use UCS-2 in a string anyway, because of the NUL bytes.
+---
+--- @param string string
+--- @param from any
+--- @param to any
+--- @return any
+function vim.fn.iconv(string, from, to) end
+
+--- Returns a |String| which is a unique identifier of the
+--- container type (|List|, |Dict|, |Blob| and |Partial|). It is
+--- guaranteed that for the mentioned types `id(v1) ==# id(v2)`
+--- returns true iff `type(v1) == type(v2) && v1 is v2`.
+--- Note that `v:_null_string`, `v:_null_list`, `v:_null_dict` and
+--- `v:_null_blob` have the same `id()` with different types
+--- because they are internally represented as NULL pointers.
+--- `id()` returns a hexadecimal representanion of the pointers to
+--- the containers (i.e. like `0x994a40`), same as `printf("%p",
+--- {expr})`, but it is advised against counting on the exact
+--- format of the return value.
+---
+--- It is not guaranteed that `id(no_longer_existing_container)`
+--- will not be equal to some other `id()`: new containers may
+--- reuse identifiers of the garbage-collected ones.
+---
+--- @param expr any
+--- @return any
+function vim.fn.id(expr) end
+
+--- The result is a Number, which is indent of line {lnum} in the
+--- current buffer.  The indent is counted in spaces, the value
+--- of 'tabstop' is relevant.  {lnum} is used just like in
+--- |getline()|.
+--- When {lnum} is invalid -1 is returned.
+---
+--- @param lnum integer
+--- @return integer
+function vim.fn.indent(lnum) end
+
+--- Find {expr} in {object} and return its index.  See
+--- |indexof()| for using a lambda to select the item.
+---
+--- If {object} is a |List| return the lowest index where the item
+--- has a value equal to {expr}.  There is no automatic
+--- conversion, so the String "4" is different from the Number 4.
+--- And the Number 4 is different from the Float 4.0.  The value
+--- of 'ignorecase' is not used here, case matters as indicated by
+--- the {ic} argument.
+---
+--- If {object} is a |Blob| return the lowest index where the byte
+--- value is equal to {expr}.
+---
+--- If {start} is given then start looking at the item with index
+--- {start} (may be negative for an item relative to the end).
+---
+--- When {ic} is given and it is |TRUE|, ignore case.  Otherwise
+--- case must match.
+---
+--- -1 is returned when {expr} is not found in {object}.
+--- Example: >vim
+---   let idx = index(words, "the")
+---   if index(numbers, 123) >= 0
+---     " ...
+---   endif
+---
+--- @param object any
+--- @param expr any
+--- @param start? any
+--- @param ic? any
+--- @return any
+function vim.fn.index(object, expr, start, ic) end
+
+--- Returns the index of an item in {object} where {expr} is
+--- v:true.  {object} must be a |List| or a |Blob|.
+---
+--- If {object} is a |List|, evaluate {expr} for each item in the
+--- List until the expression is v:true and return the index of
+--- this item.
+---
+--- If {object} is a |Blob| evaluate {expr} for each byte in the
+--- Blob until the expression is v:true and return the index of
+--- this byte.
+---
+--- {expr} must be a |string| or |Funcref|.
+---
+--- If {expr} is a |string|: If {object} is a |List|, inside
+--- {expr} |v:key| has the index of the current List item and
+--- |v:val| has the value of the item.  If {object} is a |Blob|,
+--- inside {expr} |v:key| has the index of the current byte and
+--- |v:val| has the byte value.
+---
+--- If {expr} is a |Funcref| it must take two arguments:
+---   1. the key or the index of the current item.
+---   2. the value of the current item.
+--- The function must return |TRUE| if the item is found and the
+--- search should stop.
+---
+--- The optional argument {opts} is a Dict and supports the
+--- following items:
+---     startidx  start evaluating {expr} at the item with this
+---     index; may be negative for an item relative to
+---     the end
+--- Returns -1 when {expr} evaluates to v:false for all the items.
+--- Example: >vim
+---   let l = [#{n: 10}, #{n: 20}, #{n: 30}]
+---   echo indexof(l, "v:val.n == 20")
+---   echo indexof(l, {i, v -> v.n == 30})
+---   echo indexof(l, "v:val.n == 20", #{startidx: 1})
+---
+--- @param object any
+--- @param expr any
+--- @param opts? table
+--- @return any
+function vim.fn.indexof(object, expr, opts) end
+
+---
+--- @param prompt any
+--- @param text? any
+--- @param completion? any
+--- @return any
+function vim.fn.input(prompt, text, completion) end
+
+--- The result is a String, which is whatever the user typed on
+--- the command-line.  The {prompt} argument is either a prompt
+--- string, or a blank string (for no prompt).  A '\n' can be used
+--- in the prompt to start a new line.
+---
+--- In the second form it accepts a single dictionary with the
+--- following keys, any of which may be omitted:
+---
+--- Key           Default  Description ~
+--- prompt        ""       Same as {prompt} in the first form.
+--- default       ""       Same as {text} in the first form.
+--- completion    nothing  Same as {completion} in the first form.
+--- cancelreturn  ""       The value returned when the dialog is
+---                        cancelled.
+--- highlight     nothing  Highlight handler: |Funcref|.
+---
+--- The highlighting set with |:echohl| is used for the prompt.
+--- The input is entered just like a command-line, with the same
+--- editing commands and mappings.  There is a separate history
+--- for lines typed for input().
+--- Example: >vim
+---   if input("Coffee or beer? ") == "beer"
+---     echo "Cheers!"
+---   endif
+--- <
+--- If the optional {text} argument is present and not empty, this
+--- is used for the default reply, as if the user typed this.
+--- Example: >vim
+---   let color = input("Color? ", "white")
+---
+--- <The optional {completion} argument specifies the type of
+--- completion supported for the input.  Without it completion is
+--- not performed.  The supported completion types are the same as
+--- that can be supplied to a user-defined command using the
+--- "-complete=" argument.  Refer to |:command-completion| for
+--- more information.  Example: >vim
+---   let fname = input("File: ", "", "file")
+---
+--- <      *input()-highlight* *E5400* *E5402*
+--- The optional `highlight` key allows specifying function which
+--- will be used for highlighting user input.  This function
+--- receives user input as its only argument and must return
+--- a list of 3-tuples [hl_start_col, hl_end_col + 1, hl_group]
+--- where
+---   hl_start_col is the first highlighted column,
+---   hl_end_col is the last highlighted column (+ 1!),
+---   hl_group is |:hi| group used for highlighting.
+---             *E5403* *E5404* *E5405* *E5406*
+--- Both hl_start_col and hl_end_col + 1 must point to the start
+--- of the multibyte character (highlighting must not break
+--- multibyte characters), hl_end_col + 1 may be equal to the
+--- input length.  Start column must be in range [0, len(input)),
+--- end column must be in range (hl_start_col, len(input)],
+--- sections must be ordered so that next hl_start_col is greater
+--- then or equal to previous hl_end_col.
+---
+--- Example (try some input with parentheses): >vim
+---   highlight RBP1 guibg=Red ctermbg=red
+---   highlight RBP2 guibg=Yellow ctermbg=yellow
+---   highlight RBP3 guibg=Green ctermbg=green
+---   highlight RBP4 guibg=Blue ctermbg=blue
+---   let g:rainbow_levels = 4
+---   function! RainbowParens(cmdline)
+---     let ret = []
+---     let i = 0
+---     let lvl = 0
+---     while i < len(a:cmdline)
+---       if a:cmdline[i] is# '('
+---         call add(ret, [i, i + 1, 'RBP' .. ((lvl % g:rainbow_levels) + 1)])
+---         let lvl += 1
+---       elseif a:cmdline[i] is# ')'
+---         let lvl -= 1
+---         call add(ret, [i, i + 1, 'RBP' .. ((lvl % g:rainbow_levels) + 1)])
+---       endif
+---       let i += 1
+---     endwhile
+---     return ret
+---   endfunction
+---   call input({'prompt':'>','highlight':'RainbowParens'})
+--- <
+--- Highlight function is called at least once for each new
+--- displayed input string, before command-line is redrawn.  It is
+--- expected that function is pure for the duration of one input()
+--- call, i.e. it produces the same output for the same input, so
+--- output may be memoized.  Function is run like under |:silent|
+--- modifier. If the function causes any errors, it will be
+--- skipped for the duration of the current input() call.
+---
+--- Highlighting is disabled if command-line contains arabic
+--- characters.
+---
+--- NOTE: This function must not be used in a startup file, for
+--- the versions that only run in GUI mode (e.g., the Win32 GUI).
+--- Note: When input() is called from within a mapping it will
+--- consume remaining characters from that mapping, because a
+--- mapping is handled like the characters were typed.
+--- Use |inputsave()| before input() and |inputrestore()|
+--- after input() to avoid that.  Another solution is to avoid
+--- that further characters follow in the mapping, e.g., by using
+--- |:execute| or |:normal|.
+---
+--- Example with a mapping: >vim
+---   nmap \x :call GetFoo()<CR>:exe "/" .. Foo<CR>
+---   function GetFoo()
+---     call inputsave()
+---     let g:Foo = input("enter search pattern: ")
+---     call inputrestore()
+---   endfunction
+---
+--- @param opts table
+--- @return any
+function vim.fn.input(opts) end
+
+--- @deprecated
+--- Use |input()| instead.
+---
+--- @param ... any
+--- @return any
+function vim.fn.inputdialog(...) end
+
+--- {textlist} must be a |List| of strings.  This |List| is
+--- displayed, one string per line.  The user will be prompted to
+--- enter a number, which is returned.
+--- The user can also select an item by clicking on it with the
+--- mouse, if the mouse is enabled in the command line ('mouse' is
+--- "a" or includes "c").  For the first string 0 is returned.
+--- When clicking above the first item a negative number is
+--- returned.  When clicking on the prompt one more than the
+--- length of {textlist} is returned.
+--- Make sure {textlist} has less than 'lines' entries, otherwise
+--- it won't work.  It's a good idea to put the entry number at
+--- the start of the string.  And put a prompt in the first item.
+--- Example: >vim
+---   let color = inputlist(['Select color:', '1. red',
+---     \ '2. green', '3. blue'])
+---
+--- @param textlist any
+--- @return any
+function vim.fn.inputlist(textlist) end
+
+--- Restore typeahead that was saved with a previous |inputsave()|.
+--- Should be called the same number of times inputsave() is
+--- called.  Calling it more often is harmless though.
+--- Returns TRUE when there is nothing to restore, FALSE otherwise.
+---
+--- @return any
+function vim.fn.inputrestore() end
+
+--- Preserve typeahead (also from mappings) and clear it, so that
+--- a following prompt gets input from the user.  Should be
+--- followed by a matching inputrestore() after the prompt.  Can
+--- be used several times, in which case there must be just as
+--- many inputrestore() calls.
+--- Returns TRUE when out of memory, FALSE otherwise.
+---
+--- @return any
+function vim.fn.inputsave() end
+
+--- This function acts much like the |input()| function with but
+--- two exceptions:
+--- a) the user's response will be displayed as a sequence of
+--- asterisks ("*") thereby keeping the entry secret, and
+--- b) the user's response will not be recorded on the input
+--- |history| stack.
+--- The result is a String, which is whatever the user actually
+--- typed on the command-line in response to the issued prompt.
+--- NOTE: Command-line completion is not supported.
+---
+--- @param prompt any
+--- @param text? any
+--- @return any
+function vim.fn.inputsecret(prompt, text) end
+
+--- When {object} is a |List| or a |Blob| insert {item} at the start
+--- of it.
+---
+--- If {idx} is specified insert {item} before the item with index
+--- {idx}.  If {idx} is zero it goes before the first item, just
+--- like omitting {idx}.  A negative {idx} is also possible, see
+--- |list-index|.  -1 inserts just before the last item.
+---
+--- Returns the resulting |List| or |Blob|.  Examples: >vim
+---   let mylist = insert([2, 3, 5], 1)
+---   call insert(mylist, 4, -1)
+---   call insert(mylist, 6, len(mylist))
+--- <The last example can be done simpler with |add()|.
+--- Note that when {item} is a |List| it is inserted as a single
+--- item.  Use |extend()| to concatenate |Lists|.
+---
+--- @param object any
+--- @param item any
+--- @param idx? integer
+--- @return any
+function vim.fn.insert(object, item, idx) end
+
+--- Interrupt script execution.  It works more or less like the
+--- user typing CTRL-C, most commands won't execute and control
+--- returns to the user.  This is useful to abort execution
+--- from lower down, e.g. in an autocommand.  Example: >vim
+--- function s:check_typoname(file)
+---    if fnamemodify(a:file, ':t') == '['
+---        echomsg 'Maybe typo'
+---        call interrupt()
+---    endif
+--- endfunction
+--- au BufWritePre * call s:check_typoname(expand('<amatch>'))
+--- <
+---
+--- @return any
+function vim.fn.interrupt() end
+
+--- Bitwise invert.  The argument is converted to a number.  A
+--- List, Dict or Float argument causes an error.  Example: >vim
+---   let bits = invert(bits)
+--- <
+---
+--- @param expr any
+--- @return any
+function vim.fn.invert(expr) end
+
+--- The result is a Number, which is |TRUE| when a directory
+--- with the name {directory} exists.  If {directory} doesn't
+--- exist, or isn't a directory, the result is |FALSE|.  {directory}
+--- is any expression, which is used as a String.
+---
+--- @param directory any
+--- @return 0|1
+function vim.fn.isdirectory(directory) end
+
+--- Return 1 if {expr} is a positive infinity, or -1 a negative
+--- infinity, otherwise 0. >vim
+---   echo isinf(1.0 / 0.0)
+--- <  1 >vim
+---   echo isinf(-1.0 / 0.0)
+--- <  -1
+---
+--- @param expr any
+--- @return 1|0|-1
+function vim.fn.isinf(expr) end
+
+--- The result is a Number, which is |TRUE| when {expr} is the
+--- name of a locked variable.
+--- The string argument {expr} must be the name of a variable,
+--- |List| item or |Dictionary| entry, not the variable itself!
+--- Example: >vim
+---   let alist = [0, ['a', 'b'], 2, 3]
+---   lockvar 1 alist
+---   echo islocked('alist')    " 1
+---   echo islocked('alist[1]')  " 0
+---
+--- <When {expr} is a variable that does not exist you get an error
+--- message.  Use |exists()| to check for existence.
+---
+--- @param expr any
+--- @return 0|1
+function vim.fn.islocked(expr) end
+
+--- Return |TRUE| if {expr} is a float with value NaN. >vim
+---   echo isnan(0.0 / 0.0)
+--- <  1
+---
+--- @param expr any
+--- @return 0|1
+function vim.fn.isnan(expr) end
+
+--- Return a |List| with all the key-value pairs of {dict}.  Each
+--- |List| item is a list with two items: the key of a {dict}
+--- entry and the value of this entry.  The |List| is in arbitrary
+--- order.  Also see |keys()| and |values()|.
+--- Example: >vim
+---   for [key, value] in items(mydict)
+---      echo key .. ': ' .. value
+---   endfor
+---
+--- @param dict any
+--- @return any
+function vim.fn.items(dict) end
+
+--- @deprecated
+--- Obsolete name for |chanclose()|
+---
+--- @param ... any
+--- @return any
+function vim.fn.jobclose(...) end
+
+--- Return the PID (process id) of |job-id| {job}.
+---
+--- @param job any
+--- @return integer
+function vim.fn.jobpid(job) end
+
+--- Resize the pseudo terminal window of |job-id| {job} to {width}
+--- columns and {height} rows.
+--- Fails if the job was not started with `"pty":v:true`.
+---
+--- @param job any
+--- @param width integer
+--- @param height integer
+--- @return any
+function vim.fn.jobresize(job, width, height) end
+
+--- @deprecated
+--- Obsolete name for |chansend()|
+---
+--- @param ... any
+--- @return any
+function vim.fn.jobsend(...) end
+
+--- Note: Prefer |vim.system()| in Lua (unless using the `pty` option).
+---
+--- Spawns {cmd} as a job.
+--- If {cmd} is a List it runs directly (no 'shell').
+--- If {cmd} is a String it runs in the 'shell', like this: >vim
+---   call jobstart(split(&shell) + split(&shellcmdflag) + ['{cmd}'])
+--- <(See |shell-unquoting| for details.)
+---
+--- Example: >vim
+---   call jobstart('nvim -h', {'on_stdout':{j,d,e->append(line('.'),d)}})
+--- <
+--- Returns |job-id| on success, 0 on invalid arguments (or job
+--- table is full), -1 if {cmd}[0] or 'shell' is not executable.
+--- The returned job-id is a valid |channel-id| representing the
+--- job's stdio streams. Use |chansend()| (or |rpcnotify()| and
+--- |rpcrequest()| if "rpc" was enabled) to send data to stdin and
+--- |chanclose()| to close the streams without stopping the job.
+---
+--- See |job-control| and |RPC|.
+---
+--- NOTE: on Windows if {cmd} is a List:
+---   - cmd[0] must be an executable (not a "built-in"). If it is
+---     in $PATH it can be called by name, without an extension: >vim
+---       call jobstart(['ping', 'neovim.io'])
+--- <    If it is a full or partial path, extension is required: >vim
+---       call jobstart(['System32\ping.exe', 'neovim.io'])
+--- <  - {cmd} is collapsed to a string of quoted args as expected
+---     by CommandLineToArgvW https://msdn.microsoft.com/bb776391
+---     unless cmd[0] is some form of "cmd.exe".
+---
+---           *jobstart-env*
+--- The job environment is initialized as follows:
+---   $NVIM                is set to |v:servername| of the parent Nvim
+---   $NVIM_LISTEN_ADDRESS is unset
+---   $NVIM_LOG_FILE       is unset
+---   $VIM                 is unset
+---   $VIMRUNTIME          is unset
+--- You can set these with the `env` option.
+---
+---           *jobstart-options*
+--- {opts} is a dictionary with these keys:
+---   clear_env:  (boolean) `env` defines the job environment
+---         exactly, instead of merging current environment.
+---   cwd:        (string, default=|current-directory|) Working
+---         directory of the job.
+---   detach:     (boolean) Detach the job process: it will not be
+---         killed when Nvim exits. If the process exits
+---         before Nvim, `on_exit` will be invoked.
+---   env:        (dict) Map of environment variable name:value
+---         pairs extending (or replace with "clear_env")
+---         the current environment. |jobstart-env|
+---   height:     (number) Height of the `pty` terminal.
+---   |on_exit|:    (function) Callback invoked when the job exits.
+---   |on_stdout|:  (function) Callback invoked when the job emits
+---         stdout data.
+---   |on_stderr|:  (function) Callback invoked when the job emits
+---         stderr data.
+---   overlapped: (boolean) Sets FILE_FLAG_OVERLAPPED for the
+---         stdio passed to the child process. Only on
+---         MS-Windows; ignored on other platforms.
+---   pty:        (boolean) Connect the job to a new pseudo
+---         terminal, and its streams to the master file
+---         descriptor. `on_stdout` receives all output,
+---         `on_stderr` is ignored. |terminal-start|
+---   rpc:        (boolean) Use |msgpack-rpc| to communicate with
+---         the job over stdio. Then `on_stdout` is ignored,
+---         but `on_stderr` can still be used.
+---   stderr_buffered: (boolean) Collect data until EOF (stream closed)
+---         before invoking `on_stderr`. |channel-buffered|
+---   stdout_buffered: (boolean) Collect data until EOF (stream
+---         closed) before invoking `on_stdout`. |channel-buffered|
+---   stdin:      (string) Either "pipe" (default) to connect the
+---         job's stdin to a channel or "null" to disconnect
+---         stdin.
+---   width:      (number) Width of the `pty` terminal.
+---
+--- {opts} is passed as |self| dictionary to the callback; the
+--- caller may set other keys to pass application-specific data.
+---
+--- Returns:
+---   - |channel-id| on success
+---   - 0 on invalid arguments
+---   - -1 if {cmd}[0] is not executable.
+--- See also |job-control|, |channel|, |msgpack-rpc|.
+---
+--- @param cmd any
+--- @param opts? table
+--- @return any
+function vim.fn.jobstart(cmd, opts) end
+
+--- Stop |job-id| {id} by sending SIGTERM to the job process. If
+--- the process does not terminate after a timeout then SIGKILL
+--- will be sent. When the job terminates its |on_exit| handler
+--- (if any) will be invoked.
+--- See |job-control|.
+---
+--- Returns 1 for valid job id, 0 for invalid id, including jobs have
+--- exited or stopped.
+---
+--- @param id any
+--- @return any
+function vim.fn.jobstop(id) end
+
+--- Waits for jobs and their |on_exit| handlers to complete.
+---
+--- {jobs} is a List of |job-id|s to wait for.
+--- {timeout} is the maximum waiting time in milliseconds. If
+--- omitted or -1, wait forever.
+---
+--- Timeout of 0 can be used to check the status of a job: >vim
+---   let running = jobwait([{job-id}], 0)[0] == -1
+--- <
+--- During jobwait() callbacks for jobs not in the {jobs} list may
+--- be invoked. The screen will not redraw unless |:redraw| is
+--- invoked by a callback.
+---
+--- Returns a list of len({jobs}) integers, where each integer is
+--- the status of the corresponding job:
+---   Exit-code, if the job exited
+---   -1 if the timeout was exceeded
+---   -2 if the job was interrupted (by |CTRL-C|)
+---   -3 if the job-id is invalid
+---
+--- @param jobs any
+--- @param timeout? integer
+--- @return any
+function vim.fn.jobwait(jobs, timeout) end
+
+--- Join the items in {list} together into one String.
+--- When {sep} is specified it is put in between the items.  If
+--- {sep} is omitted a single space is used.
+--- Note that {sep} is not added at the end.  You might want to
+--- add it there too: >vim
+---   let lines = join(mylist, "\n") .. "\n"
+--- <String items are used as-is.  |Lists| and |Dictionaries| are
+--- converted into a string like with |string()|.
+--- The opposite function is |split()|.
+---
+--- @param list any
+--- @param sep? any
+--- @return any
+function vim.fn.join(list, sep) end
+
+--- Convert {expr} from JSON object.  Accepts |readfile()|-style
+--- list as the input, as well as regular string.  May output any
+--- Vim value. In the following cases it will output
+--- |msgpack-special-dict|:
+--- 1. Dictionary contains duplicate key.
+--- 2. Dictionary contains empty key.
+--- 3. String contains NUL byte.  Two special dictionaries: for
+---    dictionary and for string will be emitted in case string
+---    with NUL byte was a dictionary key.
+---
+--- Note: function treats its input as UTF-8 always.  The JSON
+--- standard allows only a few encodings, of which UTF-8 is
+--- recommended and the only one required to be supported.
+--- Non-UTF-8 characters are an error.
+---
+--- @param expr any
+--- @return any
+function vim.fn.json_decode(expr) end
+
+--- Convert {expr} into a JSON string.  Accepts
+--- |msgpack-special-dict| as the input.  Will not convert
+--- |Funcref|s, mappings with non-string keys (can be created as
+--- |msgpack-special-dict|), values with self-referencing
+--- containers, strings which contain non-UTF-8 characters,
+--- pseudo-UTF-8 strings which contain codepoints reserved for
+--- surrogate pairs (such strings are not valid UTF-8 strings).
+--- Non-printable characters are converted into "\u1234" escapes
+--- or special escapes like "\t", other are dumped as-is.
+--- |Blob|s are converted to arrays of the individual bytes.
+---
+--- @param expr any
+--- @return any
+function vim.fn.json_encode(expr) end
+
+--- Return a |List| with all the keys of {dict}.  The |List| is in
+--- arbitrary order.  Also see |items()| and |values()|.
+---
+--- @param dict any
+--- @return any
+function vim.fn.keys(dict) end
+
+--- Turn the internal byte representation of keys into a form that
+--- can be used for |:map|.  E.g. >vim
+---   let xx = "\<C-Home>"
+---   echo keytrans(xx)
+--- <  <C-Home>
+---
+--- @param string string
+--- @return any
+function vim.fn.keytrans(string) end
+
+--- @deprecated
+--- Obsolete name for bufnr("$").
+---
+--- @return any
+function vim.fn.last_buffer_nr() end
+
+--- The result is a Number, which is the length of the argument.
+--- When {expr} is a String or a Number the length in bytes is
+--- used, as with |strlen()|.
+--- When {expr} is a |List| the number of items in the |List| is
+--- returned.
+--- When {expr} is a |Blob| the number of bytes is returned.
+--- When {expr} is a |Dictionary| the number of entries in the
+--- |Dictionary| is returned.
+--- Otherwise an error is given and returns zero.
+---
+--- @param expr any
+--- @return any
+function vim.fn.len(expr) end
+
+--- Call function {funcname} in the run-time library {libname}
+--- with single argument {argument}.
+--- This is useful to call functions in a library that you
+--- especially made to be used with Vim.  Since only one argument
+--- is possible, calling standard library functions is rather
+--- limited.
+--- The result is the String returned by the function.  If the
+--- function returns NULL, this will appear as an empty string ""
+--- to Vim.
+--- If the function returns a number, use libcallnr()!
+--- If {argument} is a number, it is passed to the function as an
+--- int; if {argument} is a string, it is passed as a
+--- null-terminated string.
+---
+--- libcall() allows you to write your own 'plug-in' extensions to
+--- Vim without having to recompile the program.  It is NOT a
+--- means to call system functions!  If you try to do so Vim will
+--- very probably crash.
+---
+--- For Win32, the functions you write must be placed in a DLL
+--- and use the normal C calling convention (NOT Pascal which is
+--- used in Windows System DLLs).  The function must take exactly
+--- one parameter, either a character pointer or a long integer,
+--- and must return a character pointer or NULL.  The character
+--- pointer returned must point to memory that will remain valid
+--- after the function has returned (e.g. in static data in the
+--- DLL).  If it points to allocated memory, that memory will
+--- leak away.  Using a static buffer in the function should work,
+--- it's then freed when the DLL is unloaded.
+---
+--- WARNING: If the function returns a non-valid pointer, Vim may
+--- crash!  This also happens if the function returns a number,
+--- because Vim thinks it's a pointer.
+--- For Win32 systems, {libname} should be the filename of the DLL
+--- without the ".DLL" suffix.  A full path is only required if
+--- the DLL is not in the usual places.
+--- For Unix: When compiling your own plugins, remember that the
+--- object code must be compiled as position-independent ('PIC').
+--- Examples: >vim
+---   echo libcall("libc.so", "getenv", "HOME")
+---
+--- @param libname string
+--- @param funcname string
+--- @param argument any
+--- @return any
+function vim.fn.libcall(libname, funcname, argument) end
+
+--- Just like |libcall()|, but used for a function that returns an
+--- int instead of a string.
+--- Examples: >vim
+---   echo libcallnr("/usr/lib/libc.so", "getpid", "")
+---   call libcallnr("libc.so", "printf", "Hello World!\n")
+---   call libcallnr("libc.so", "sleep", 10)
+--- <
+---
+--- @param libname string
+--- @param funcname string
+--- @param argument any
+--- @return any
+function vim.fn.libcallnr(libname, funcname, argument) end
+
+--- The result is a Number, which is the line number of the file
+--- position given with {expr}.  The {expr} argument is a string.
+--- The accepted positions are:
+---     .      the cursor position
+---     $      the last line in the current buffer
+---     'x      position of mark x (if the mark is not set, 0 is
+---       returned)
+---     w0      first line visible in current window (one if the
+---       display isn't updated, e.g. in silent Ex mode)
+---     w$      last line visible in current window (this is one
+---       less than "w0" if no lines are visible)
+---     v      In Visual mode: the start of the Visual area (the
+---       cursor is the end).  When not in Visual mode
+---       returns the cursor position.  Differs from |'<| in
+---       that it's updated right away.
+--- Note that a mark in another file can be used.  The line number
+--- then applies to another buffer.
+--- To get the column number use |col()|.  To get both use
+--- |getpos()|.
+--- With the optional {winid} argument the values are obtained for
+--- that window instead of the current window.
+--- Returns 0 for invalid values of {expr} and {winid}.
+--- Examples: >vim
+---   echo line(".")      " line number of the cursor
+---   echo line(".", winid)    " idem, in window "winid"
+---   echo line("'t")      " line number of mark t
+---   echo line("'" .. marker)  " line number of mark marker
+--- <
+--- To jump to the last known position when opening a file see
+--- |last-position-jump|.
+---
+--- @param expr any
+--- @param winid? integer
+--- @return integer
+function vim.fn.line(expr, winid) end
+
+--- Return the byte count from the start of the buffer for line
+--- {lnum}.  This includes the end-of-line character, depending on
+--- the 'fileformat' option for the current buffer.  The first
+--- line returns 1. UTF-8 encoding is used, 'fileencoding' is
+--- ignored.  This can also be used to get the byte count for the
+--- line just below the last line: >vim
+---   echo line2byte(line("$") + 1)
+--- <This is the buffer size plus one.  If 'fileencoding' is empty
+--- it is the file size plus one.  {lnum} is used like with
+--- |getline()|.  When {lnum} is invalid -1 is returned.
+--- Also see |byte2line()|, |go| and |:goto|.
+---
+--- @param lnum integer
+--- @return integer
+function vim.fn.line2byte(lnum) end
+
+--- Get the amount of indent for line {lnum} according the lisp
+--- indenting rules, as with 'lisp'.
+--- The indent is counted in spaces, the value of 'tabstop' is
+--- relevant.  {lnum} is used just like in |getline()|.
+--- When {lnum} is invalid, -1 is returned.
+---
+--- @param lnum integer
+--- @return any
+function vim.fn.lispindent(lnum) end
+
+--- Return a Blob concatenating all the number values in {list}.
+--- Examples: >vim
+---   echo list2blob([1, 2, 3, 4])  " returns 0z01020304
+---   echo list2blob([])    " returns 0z
+--- <Returns an empty Blob on error.  If one of the numbers is
+--- negative or more than 255 error *E1239* is given.
+---
+--- |blob2list()| does the opposite.
+---
+--- @param list any
+--- @return any
+function vim.fn.list2blob(list) end
+
+--- Convert each number in {list} to a character string can
+--- concatenate them all.  Examples: >vim
+---   echo list2str([32])    " returns " "
+---   echo list2str([65, 66, 67])  " returns "ABC"
+--- <The same can be done (slowly) with: >vim
+---   echo join(map(list, {nr, val -> nr2char(val)}), '')
+--- <|str2list()| does the opposite.
+---
+--- UTF-8 encoding is always used, {utf8} option has no effect,
+--- and exists only for backwards-compatibility.
+--- With UTF-8 composing characters work as expected: >vim
+---   echo list2str([97, 769])  " returns "á"
+--- <
+--- Returns an empty string on error.
+---
+--- @param list any
+--- @param utf8? any
+--- @return any
+function vim.fn.list2str(list, utf8) end
+
+--- Return the current time, measured as seconds since 1st Jan
+--- 1970.  See also |strftime()|, |strptime()| and |getftime()|.
+---
+--- @return any
+function vim.fn.localtime() end
+
+--- Return the natural logarithm (base e) of {expr} as a |Float|.
+--- {expr} must evaluate to a |Float| or a |Number| in the range
+--- (0, inf].
+--- Returns 0.0 if {expr} is not a |Float| or a |Number|.
+--- Examples: >vim
+---   echo log(10)
+--- <  2.302585 >vim
+---   echo log(exp(5))
+--- <  5.0
+---
+--- @param expr any
+--- @return any
+function vim.fn.log(expr) end
+
+--- Return the logarithm of Float {expr} to base 10 as a |Float|.
+--- {expr} must evaluate to a |Float| or a |Number|.
+--- Returns 0.0 if {expr} is not a |Float| or a |Number|.
+--- Examples: >vim
+---   echo log10(1000)
+--- <  3.0 >vim
+---   echo log10(0.01)
+--- <  -2.0
+---
+--- @param expr any
+--- @return any
+function vim.fn.log10(expr) end
+
+--- {expr1} must be a |List|, |String|, |Blob| or |Dictionary|.
+--- When {expr1} is a |List|| or |Dictionary|, replace each
+--- item in {expr1} with the result of evaluating {expr2}.
+--- For a |Blob| each byte is replaced.
+--- For a |String|, each character, including composing
+--- characters, is replaced.
+--- If the item type changes you may want to use |mapnew()| to
+--- create a new List or Dictionary.
+---
+--- {expr2} must be a |String| or |Funcref|.
+---
+--- If {expr2} is a |String|, inside {expr2} |v:val| has the value
+--- of the current item.  For a |Dictionary| |v:key| has the key
+--- of the current item and for a |List| |v:key| has the index of
+--- the current item.  For a |Blob| |v:key| has the index of the
+--- current byte. For a |String| |v:key| has the index of the
+--- current character.
+--- Example: >vim
+---   call map(mylist, '"> " .. v:val .. " <"')
+--- <This puts "> " before and " <" after each item in "mylist".
+---
+--- Note that {expr2} is the result of an expression and is then
+--- used as an expression again.  Often it is good to use a
+--- |literal-string| to avoid having to double backslashes.  You
+--- still have to double ' quotes
+---
+--- If {expr2} is a |Funcref| it is called with two arguments:
+---   1. The key or the index of the current item.
+---   2. the value of the current item.
+--- The function must return the new value of the item. Example
+--- that changes each value by "key-value": >vim
+---   func KeyValue(key, val)
+---     return a:key .. '-' .. a:val
+---   endfunc
+---   call map(myDict, function('KeyValue'))
+--- <It is shorter when using a |lambda|: >vim
+---   call map(myDict, {key, val -> key .. '-' .. val})
+--- <If you do not use "val" you can leave it out: >vim
+---   call map(myDict, {key -> 'item: ' .. key})
+--- <If you do not use "key" you can use a short name: >vim
+---   call map(myDict, {_, val -> 'item: ' .. val})
+--- <
+--- The operation is done in-place for a |List| and |Dictionary|.
+--- If you want it to remain unmodified make a copy first: >vim
+---   let tlist = map(copy(mylist), ' v:val .. "\t"')
+---
+--- <Returns {expr1}, the |List| or |Dictionary| that was filtered,
+--- or a new |Blob| or |String|.
+--- When an error is encountered while evaluating {expr2} no
+--- further items in {expr1} are processed.
+--- When {expr2} is a Funcref errors inside a function are ignored,
+--- unless it was defined with the "abort" flag.
+---
+--- @param expr1 any
+--- @param expr2 any
+--- @return any
+function vim.fn.map(expr1, expr2) end
+
+--- When {dict} is omitted or zero: Return the rhs of mapping
+--- {name} in mode {mode}.  The returned String has special
+--- characters translated like in the output of the ":map" command
+--- listing. When {dict} is TRUE a dictionary is returned, see
+--- below. To get a list of all mappings see |maplist()|.
+---
+--- When there is no mapping for {name}, an empty String is
+--- returned if {dict} is FALSE, otherwise returns an empty Dict.
+--- When the mapping for {name} is empty, then "<Nop>" is
+--- returned.
+---
+--- The {name} can have special key names, like in the ":map"
+--- command.
+---
+--- {mode} can be one of these strings:
+---   "n"  Normal
+---   "v"  Visual (including Select)
+---   "o"  Operator-pending
+---   "i"  Insert
+---   "c"  Cmd-line
+---   "s"  Select
+---   "x"  Visual
+---   "l"  langmap |language-mapping|
+---   "t"  Terminal
+---   ""  Normal, Visual and Operator-pending
+--- When {mode} is omitted, the modes for "" are used.
+---
+--- When {abbr} is there and it is |TRUE| use abbreviations
+--- instead of mappings.
+---
+--- When {dict} is there and it is |TRUE| return a dictionary
+--- containing all the information of the mapping with the
+--- following items:      *mapping-dict*
+---   "lhs"       The {lhs} of the mapping as it would be typed
+---   "lhsraw"   The {lhs} of the mapping as raw bytes
+---   "lhsrawalt" The {lhs} of the mapping as raw bytes, alternate
+---         form, only present when it differs from "lhsraw"
+---   "rhs"       The {rhs} of the mapping as typed.
+---   "silent"   1 for a |:map-silent| mapping, else 0.
+---   "noremap"  1 if the {rhs} of the mapping is not remappable.
+---   "script"   1 if mapping was defined with <script>.
+---   "expr"     1 for an expression mapping (|:map-<expr>|).
+---   "buffer"   1 for a buffer local mapping (|:map-local|).
+---   "mode"     Modes for which the mapping is defined. In
+---        addition to the modes mentioned above, these
+---        characters will be used:
+---        " "     Normal, Visual and Operator-pending
+---        "!"     Insert and Commandline mode
+---          (|mapmode-ic|)
+---   "sid"       The script local ID, used for <sid> mappings
+---        (|<SID>|).  Negative for special contexts.
+---   "scriptversion"  The version of the script, always 1.
+---   "lnum"     The line number in "sid", zero if unknown.
+---   "nowait"   Do not wait for other, longer mappings.
+---        (|:map-<nowait>|).
+---   "abbr"     True if this is an |abbreviation|.
+---   "mode_bits" Nvim's internal binary representation of "mode".
+---        |mapset()| ignores this; only "mode" is used.
+---        See |maplist()| for usage examples. The values
+---        are from src/nvim/state_defs.h and may change in
+---        the future.
+---
+--- The dictionary can be used to restore a mapping with
+--- |mapset()|.
+---
+--- The mappings local to the current buffer are checked first,
+--- then the global mappings.
+--- This function can be used to map a key even when it's already
+--- mapped, and have it do the original mapping too.  Sketch: >vim
+---   exe 'nnoremap <Tab> ==' .. maparg('<Tab>', 'n')
+---
+--- @param name string
+--- @param mode? string
+--- @param abbr? boolean
+--- @param dict? boolean
+--- @return string|table<string,any>
+function vim.fn.maparg(name, mode, abbr, dict) end
+
+--- Check if there is a mapping that matches with {name} in mode
+--- {mode}.  See |maparg()| for {mode} and special names in
+--- {name}.
+--- When {abbr} is there and it is non-zero use abbreviations
+--- instead of mappings.
+--- A match happens with a mapping that starts with {name} and
+--- with a mapping which is equal to the start of {name}.
+---
+---   matches mapping "a"  "ab"  "abc" ~
+---    mapcheck("a")  yes  yes   yes
+---    mapcheck("abc")  yes  yes   yes
+---    mapcheck("ax")  yes  no   no
+---    mapcheck("b")  no  no   no
+---
+--- The difference with maparg() is that mapcheck() finds a
+--- mapping that matches with {name}, while maparg() only finds a
+--- mapping for {name} exactly.
+--- When there is no mapping that starts with {name}, an empty
+--- String is returned.  If there is one, the RHS of that mapping
+--- is returned.  If there are several mappings that start with
+--- {name}, the RHS of one of them is returned.  This will be
+--- "<Nop>" if the RHS is empty.
+--- The mappings local to the current buffer are checked first,
+--- then the global mappings.
+--- This function can be used to check if a mapping can be added
+--- without being ambiguous.  Example: >vim
+---   if mapcheck("_vv") == ""
+---      map _vv :set guifont=7x13<CR>
+---   endif
+--- <This avoids adding the "_vv" mapping when there already is a
+--- mapping for "_v" or for "_vvv".
+---
+--- @param name string
+--- @param mode? string
+--- @param abbr? any
+--- @return any
+function vim.fn.mapcheck(name, mode, abbr) end
+
+--- Returns a |List| of all mappings.  Each List item is a |Dict|,
+--- the same as what is returned by |maparg()|, see
+--- |mapping-dict|.  When {abbr} is there and it is |TRUE| use
+--- abbreviations instead of mappings.
+---
+--- Example to show all mappings with "MultiMatch" in rhs: >vim
+---   echo maplist()->filter({_, m ->
+---     \ match(get(m, 'rhs', ''), 'MultiMatch') >= 0
+---     \ })
+--- <It can be tricky to find mappings for particular |:map-modes|.
+--- |mapping-dict|'s "mode_bits" can simplify this. For example,
+--- the mode_bits for Normal, Insert or Command-line modes are
+--- 0x19. To find all the mappings available in those modes you
+--- can do: >vim
+---   let saved_maps = []
+---   for m in maplist()
+---       if and(m.mode_bits, 0x19) != 0
+---     eval saved_maps->add(m)
+---       endif
+---   endfor
+---   echo saved_maps->mapnew({_, m -> m.lhs})
+--- <The values of the mode_bits are defined in Nvim's
+--- src/nvim/state_defs.h file and they can be discovered at
+--- runtime using |:map-commands| and "maplist()". Example: >vim
+---   omap xyzzy <Nop>
+---   let op_bit = maplist()->filter(
+---       \ {_, m -> m.lhs == 'xyzzy'})[0].mode_bits
+---   ounmap xyzzy
+---   echo printf("Operator-pending mode bit: 0x%x", op_bit)
+---
+--- @return any
+function vim.fn.maplist() end
+
+--- Like |map()| but instead of replacing items in {expr1} a new
+--- List or Dictionary is created and returned.  {expr1} remains
+--- unchanged.  Items can still be changed by {expr2}, if you
+--- don't want that use |deepcopy()| first.
+---
+--- @param expr1 any
+--- @param expr2 any
+--- @return any
+function vim.fn.mapnew(expr1, expr2) end
+
+--- Restore a mapping from a dictionary, possibly returned by
+--- |maparg()| or |maplist()|.  A buffer mapping, when dict.buffer
+--- is true, is set on the current buffer; it is up to the caller
+--- to ensure that the intended buffer is the current buffer. This
+--- feature allows copying mappings from one buffer to another.
+--- The dict.mode value may restore a single mapping that covers
+--- more than one mode, like with mode values of '!', ' ', "nox",
+--- or 'v'. *E1276*
+---
+--- In the first form, {mode} and {abbr} should be the same as
+--- for the call to |maparg()|. *E460*
+--- {mode} is used to define the mode in which the mapping is set,
+--- not the "mode" entry in {dict}.
+--- Example for saving and restoring a mapping: >vim
+---   let save_map = maparg('K', 'n', 0, 1)
+---   nnoremap K somethingelse
+---   " ...
+---   call mapset('n', 0, save_map)
+--- <Note that if you are going to replace a map in several modes,
+--- e.g. with `:map!`, you need to save/restore the mapping for
+--- all of them, when they might differ.
+---
+--- In the second form, with {dict} as the only argument, mode
+--- and abbr are taken from the dict.
+--- Example: >vim
+---   let save_maps = maplist()->filter(
+---         \ {_, m -> m.lhs == 'K'})
+---   nnoremap K somethingelse
+---   cnoremap K somethingelse2
+---   " ...
+---   unmap K
+---   for d in save_maps
+---       call mapset(d)
+---   endfor
+---
+--- @param mode string
+--- @param abbr? any
+--- @param dict? any
+--- @return any
+function vim.fn.mapset(mode, abbr, dict) end
+
+--- When {expr} is a |List| then this returns the index of the
+--- first item where {pat} matches.  Each item is used as a
+--- String, |Lists| and |Dictionaries| are used as echoed.
+---
+--- Otherwise, {expr} is used as a String.  The result is a
+--- Number, which gives the index (byte offset) in {expr} where
+--- {pat} matches.
+---
+--- A match at the first character or |List| item returns zero.
+--- If there is no match -1 is returned.
+---
+--- For getting submatches see |matchlist()|.
+--- Example: >vim
+---   echo match("testing", "ing")  " results in 4
+---   echo match([1, 'x'], '\a')  " results in 1
+--- <See |string-match| for how {pat} is used.
+---             *strpbrk()*
+--- Vim doesn't have a strpbrk() function.  But you can do: >vim
+---   let sepidx = match(line, '[.,;: \t]')
+--- <            *strcasestr()*
+--- Vim doesn't have a strcasestr() function.  But you can add
+--- "\c" to the pattern to ignore case: >vim
+---   let idx = match(haystack, '\cneedle')
+--- <
+--- If {start} is given, the search starts from byte index
+--- {start} in a String or item {start} in a |List|.
+--- The result, however, is still the index counted from the
+--- first character/item.  Example: >vim
+---   echo match("testing", "ing", 2)
+--- <result is again "4". >vim
+---   echo match("testing", "ing", 4)
+--- <result is again "4". >vim
+---   echo match("testing", "t", 2)
+--- <result is "3".
+--- For a String, if {start} > 0 then it is like the string starts
+--- {start} bytes later, thus "^" will match at {start}.  Except
+--- when {count} is given, then it's like matches before the
+--- {start} byte are ignored (this is a bit complicated to keep it
+--- backwards compatible).
+--- For a String, if {start} < 0, it will be set to 0.  For a list
+--- the index is counted from the end.
+--- If {start} is out of range ({start} > strlen({expr}) for a
+--- String or {start} > len({expr}) for a |List|) -1 is returned.
+---
+--- When {count} is given use the {count}th match.  When a match
+--- is found in a String the search for the next one starts one
+--- character further.  Thus this example results in 1: >vim
+---   echo match("testing", "..", 0, 2)
+--- <In a |List| the search continues in the next item.
+--- Note that when {count} is added the way {start} works changes,
+--- see above.
+---
+--- See |pattern| for the patterns that are accepted.
+--- The 'ignorecase' option is used to set the ignore-caseness of
+--- the pattern.  'smartcase' is NOT used.  The matching is always
+--- done like 'magic' is set and 'cpoptions' is empty.
+--- Note that a match at the start is preferred, thus when the
+--- pattern is using "*" (any number of matches) it tends to find
+--- zero matches at the start instead of a number of matches
+--- further down in the text.
+---
+--- @param expr any
+--- @param pat any
+--- @param start? any
+--- @param count? any
+--- @return any
+function vim.fn.match(expr, pat, start, count) end
+
+--- Defines a pattern to be highlighted in the current window (a
+--- "match").  It will be highlighted with {group}.  Returns an
+--- identification number (ID), which can be used to delete the
+--- match using |matchdelete()|.  The ID is bound to the window.
+--- Matching is case sensitive and magic, unless case sensitivity
+--- or magicness are explicitly overridden in {pattern}.  The
+--- 'magic', 'smartcase' and 'ignorecase' options are not used.
+--- The "Conceal" value is special, it causes the match to be
+--- concealed.
+---
+--- The optional {priority} argument assigns a priority to the
+--- match.  A match with a high priority will have its
+--- highlighting overrule that of a match with a lower priority.
+--- A priority is specified as an integer (negative numbers are no
+--- exception).  If the {priority} argument is not specified, the
+--- default priority is 10.  The priority of 'hlsearch' is zero,
+--- hence all matches with a priority greater than zero will
+--- overrule it.  Syntax highlighting (see 'syntax') is a separate
+--- mechanism, and regardless of the chosen priority a match will
+--- always overrule syntax highlighting.
+---
+--- The optional {id} argument allows the request for a specific
+--- match ID.  If a specified ID is already taken, an error
+--- message will appear and the match will not be added.  An ID
+--- is specified as a positive integer (zero excluded).  IDs 1, 2
+--- and 3 are reserved for |:match|, |:2match| and |:3match|,
+--- respectively.  3 is reserved for use by the |matchparen|
+--- plugin.
+--- If the {id} argument is not specified or -1, |matchadd()|
+--- automatically chooses a free ID, which is at least 1000.
+---
+--- The optional {dict} argument allows for further custom
+--- values. Currently this is used to specify a match specific
+--- conceal character that will be shown for |hl-Conceal|
+--- highlighted matches. The dict can have the following members:
+---
+---   conceal      Special character to show instead of the
+---         match (only for |hl-Conceal| highlighted
+---         matches, see |:syn-cchar|)
+---   window      Instead of the current window use the
+---         window with this number or window ID.
+---
+--- The number of matches is not limited, as it is the case with
+--- the |:match| commands.
+---
+--- Returns -1 on error.
+---
+--- Example: >vim
+---   highlight MyGroup ctermbg=green guibg=green
+---   let m = matchadd("MyGroup", "TODO")
+--- <Deletion of the pattern: >vim
+---   call matchdelete(m)
+---
+--- <A list of matches defined by |matchadd()| and |:match| are
+--- available from |getmatches()|.  All matches can be deleted in
+--- one operation by |clearmatches()|.
+---
+--- @param group any
+--- @param pattern any
+--- @param priority? any
+--- @param id? any
+--- @param dict? any
+--- @return any
+function vim.fn.matchadd(group, pattern, priority, id, dict) end
+
+--- Same as |matchadd()|, but requires a list of positions {pos}
+--- instead of a pattern. This command is faster than |matchadd()|
+--- because it does not require to handle regular expressions and
+--- sets buffer line boundaries to redraw screen. It is supposed
+--- to be used when fast match additions and deletions are
+--- required, for example to highlight matching parentheses.
+---           *E5030* *E5031*
+--- {pos} is a list of positions.  Each position can be one of
+--- these:
+--- - A number.  This whole line will be highlighted.  The first
+---   line has number 1.
+--- - A list with one number, e.g., [23]. The whole line with this
+---   number will be highlighted.
+--- - A list with two numbers, e.g., [23, 11]. The first number is
+---   the line number, the second one is the column number (first
+---   column is 1, the value must correspond to the byte index as
+---   |col()| would return).  The character at this position will
+---   be highlighted.
+--- - A list with three numbers, e.g., [23, 11, 3]. As above, but
+---   the third number gives the length of the highlight in bytes.
+---
+--- Entries with zero and negative line numbers are silently
+--- ignored, as well as entries with negative column numbers and
+--- lengths.
+---
+--- Returns -1 on error.
+---
+--- Example: >vim
+---   highlight MyGroup ctermbg=green guibg=green
+---   let m = matchaddpos("MyGroup", [[23, 24], 34])
+--- <Deletion of the pattern: >vim
+---   call matchdelete(m)
+---
+--- <Matches added by |matchaddpos()| are returned by
+--- |getmatches()|.
+---
+--- @param group any
+--- @param pos any
+--- @param priority? any
+--- @param id? any
+--- @param dict? any
+--- @return any
+function vim.fn.matchaddpos(group, pos, priority, id, dict) end
+
+--- Selects the {nr} match item, as set with a |:match|,
+--- |:2match| or |:3match| command.
+--- Return a |List| with two elements:
+---   The name of the highlight group used
+---   The pattern used.
+--- When {nr} is not 1, 2 or 3 returns an empty |List|.
+--- When there is no match item set returns ['', ''].
+--- This is useful to save and restore a |:match|.
+--- Highlighting matches using the |:match| commands are limited
+--- to three matches. |matchadd()| does not have this limitation.
+---
+--- @param nr integer
+--- @return any
+function vim.fn.matcharg(nr) end
+
+--- Deletes a match with ID {id} previously defined by |matchadd()|
+--- or one of the |:match| commands.  Returns 0 if successful,
+--- otherwise -1.  See example for |matchadd()|.  All matches can
+--- be deleted in one operation by |clearmatches()|.
+--- If {win} is specified, use the window with this number or
+--- window ID instead of the current window.
+---
+--- @param id any
+--- @param win? any
+--- @return any
+function vim.fn.matchdelete(id, win) end
+
+--- Same as |match()|, but return the index of first character
+--- after the match.  Example: >vim
+---   echo matchend("testing", "ing")
+--- <results in "7".
+---           *strspn()* *strcspn()*
+--- Vim doesn't have a strspn() or strcspn() function, but you can
+--- do it with matchend(): >vim
+---   let span = matchend(line, '[a-zA-Z]')
+---   let span = matchend(line, '[^a-zA-Z]')
+--- <Except that -1 is returned when there are no matches.
+---
+--- The {start}, if given, has the same meaning as for |match()|. >vim
+---   echo matchend("testing", "ing", 2)
+--- <results in "7". >vim
+---   echo matchend("testing", "ing", 5)
+--- <result is "-1".
+--- When {expr} is a |List| the result is equal to |match()|.
+---
+--- @param expr any
+--- @param pat any
+--- @param start? any
+--- @param count? any
+--- @return any
+function vim.fn.matchend(expr, pat, start, count) end
+
+--- If {list} is a list of strings, then returns a |List| with all
+--- the strings in {list} that fuzzy match {str}. The strings in
+--- the returned list are sorted based on the matching score.
+---
+--- The optional {dict} argument always supports the following
+--- items:
+---     matchseq  When this item is present return only matches
+---     that contain the characters in {str} in the
+---     given sequence.
+---     limit  Maximum number of matches in {list} to be
+---     returned.  Zero means no limit.
+---
+--- If {list} is a list of dictionaries, then the optional {dict}
+--- argument supports the following additional items:
+---     key    Key of the item which is fuzzy matched against
+---     {str}. The value of this item should be a
+---     string.
+---     text_cb  |Funcref| that will be called for every item
+---     in {list} to get the text for fuzzy matching.
+---     This should accept a dictionary item as the
+---     argument and return the text for that item to
+---     use for fuzzy matching.
+---
+--- {str} is treated as a literal string and regular expression
+--- matching is NOT supported.  The maximum supported {str} length
+--- is 256.
+---
+--- When {str} has multiple words each separated by white space,
+--- then the list of strings that have all the words is returned.
+---
+--- If there are no matching strings or there is an error, then an
+--- empty list is returned. If length of {str} is greater than
+--- 256, then returns an empty list.
+---
+--- When {limit} is given, matchfuzzy() will find up to this
+--- number of matches in {list} and return them in sorted order.
+---
+--- Refer to |fuzzy-matching| for more information about fuzzy
+--- matching strings.
+---
+--- Example: >vim
+---    echo matchfuzzy(["clay", "crow"], "cay")
+--- <results in ["clay"]. >vim
+---    echo getbufinfo()->map({_, v -> v.name})->matchfuzzy("ndl")
+--- <results in a list of buffer names fuzzy matching "ndl". >vim
+---    echo getbufinfo()->matchfuzzy("ndl", {'key' : 'name'})
+--- <results in a list of buffer information dicts with buffer
+--- names fuzzy matching "ndl". >vim
+---    echo getbufinfo()->matchfuzzy("spl",
+---         \ {'text_cb' : {v -> v.name}})
+--- <results in a list of buffer information dicts with buffer
+--- names fuzzy matching "spl". >vim
+---    echo v:oldfiles->matchfuzzy("test")
+--- <results in a list of file names fuzzy matching "test". >vim
+---    let l = readfile("buffer.c")->matchfuzzy("str")
+--- <results in a list of lines in "buffer.c" fuzzy matching "str". >vim
+---    echo ['one two', 'two one']->matchfuzzy('two one')
+--- <results in `['two one', 'one two']` . >vim
+---    echo ['one two', 'two one']->matchfuzzy('two one',
+---         \ {'matchseq': 1})
+--- <results in `['two one']`.
+---
+--- @param list any
+--- @param str any
+--- @param dict? any
+--- @return any
+function vim.fn.matchfuzzy(list, str, dict) end
+
+--- Same as |matchfuzzy()|, but returns the list of matched
+--- strings, the list of character positions where characters
+--- in {str} matches and a list of matching scores.  You can
+--- use |byteidx()| to convert a character position to a byte
+--- position.
+---
+--- If {str} matches multiple times in a string, then only the
+--- positions for the best match is returned.
+---
+--- If there are no matching strings or there is an error, then a
+--- list with three empty list items is returned.
+---
+--- Example: >vim
+---   echo matchfuzzypos(['testing'], 'tsg')
+--- <results in [["testing"], [[0, 2, 6]], [99]] >vim
+---   echo matchfuzzypos(['clay', 'lacy'], 'la')
+--- <results in [["lacy", "clay"], [[0, 1], [1, 2]], [153, 133]] >vim
+---   echo [{'text': 'hello', 'id' : 10}]
+---     \ ->matchfuzzypos('ll', {'key' : 'text'})
+--- <results in `[[{"id": 10, "text": "hello"}], [[2, 3]], [127]]`
+---
+--- @param list any
+--- @param str any
+--- @param dict? any
+--- @return any
+function vim.fn.matchfuzzypos(list, str, dict) end
+
+--- Same as |match()|, but return a |List|.  The first item in the
+--- list is the matched string, same as what matchstr() would
+--- return.  Following items are submatches, like "\1", "\2", etc.
+--- in |:substitute|.  When an optional submatch didn't match an
+--- empty string is used.  Example: >vim
+---   echo matchlist('acd', '\(a\)\?\(b\)\?\(c\)\?\(.*\)')
+--- <Results in: ['acd', 'a', '', 'c', 'd', '', '', '', '', '']
+--- When there is no match an empty list is returned.
+---
+--- You can pass in a List, but that is not very useful.
+---
+--- @param expr any
+--- @param pat any
+--- @param start? any
+--- @param count? any
+--- @return any
+function vim.fn.matchlist(expr, pat, start, count) end
+
+--- Same as |match()|, but return the matched string.  Example: >vim
+---   echo matchstr("testing", "ing")
+--- <results in "ing".
+--- When there is no match "" is returned.
+--- The {start}, if given, has the same meaning as for |match()|. >vim
+---   echo matchstr("testing", "ing", 2)
+--- <results in "ing". >vim
+---   echo matchstr("testing", "ing", 5)
+--- <result is "".
+--- When {expr} is a |List| then the matching item is returned.
+--- The type isn't changed, it's not necessarily a String.
+---
+--- @param expr any
+--- @param pat any
+--- @param start? any
+--- @param count? any
+--- @return any
+function vim.fn.matchstr(expr, pat, start, count) end
+
+--- Same as |matchstr()|, but return the matched string, the start
+--- position and the end position of the match.  Example: >vim
+---   echo matchstrpos("testing", "ing")
+--- <results in ["ing", 4, 7].
+--- When there is no match ["", -1, -1] is returned.
+--- The {start}, if given, has the same meaning as for |match()|. >vim
+---   echo matchstrpos("testing", "ing", 2)
+--- <results in ["ing", 4, 7]. >vim
+---   echo matchstrpos("testing", "ing", 5)
+--- <result is ["", -1, -1].
+--- When {expr} is a |List| then the matching item, the index
+--- of first item where {pat} matches, the start position and the
+--- end position of the match are returned. >vim
+---   echo matchstrpos([1, '__x'], '\a')
+--- <result is ["x", 1, 2, 3].
+--- The type isn't changed, it's not necessarily a String.
+---
+--- @param expr any
+--- @param pat any
+--- @param start? any
+--- @param count? any
+--- @return any
+function vim.fn.matchstrpos(expr, pat, start, count) end
+
+--- Return the maximum value of all items in {expr}. Example: >vim
+---   echo max([apples, pears, oranges])
+---
+--- <{expr} can be a |List| or a |Dictionary|.  For a Dictionary,
+--- it returns the maximum of all values in the Dictionary.
+--- If {expr} is neither a List nor a Dictionary, or one of the
+--- items in {expr} cannot be used as a Number this results in
+---                 an error.  An empty |List| or |Dictionary| results in zero.
+---
+--- @param expr any
+--- @return any
+function vim.fn.max(expr) end
+
+--- Returns a |List| of |Dictionaries| describing |menus| (defined
+--- by |:menu|, |:amenu|, …), including |hidden-menus|.
+---
+--- {path} matches a menu by name, or all menus if {path} is an
+--- empty string.  Example: >vim
+---   echo menu_get('File','')
+---   echo menu_get('')
+--- <
+--- {modes} is a string of zero or more modes (see |maparg()| or
+--- |creating-menus| for the list of modes). "a" means "all".
+---
+--- Example: >vim
+---   nnoremenu &Test.Test inormal
+---   inoremenu Test.Test insert
+---   vnoremenu Test.Test x
+---   echo menu_get("")
+---
+--- <returns something like this: >
+---
+---   [ {
+---     "hidden": 0,
+---     "name": "Test",
+---     "priority": 500,
+---     "shortcut": 84,
+---     "submenus": [ {
+---       "hidden": 0,
+---       "mappings": {
+---         i": {
+---     "enabled": 1,
+---     "noremap": 1,
+---     "rhs": "insert",
+---     "sid": 1,
+---     "silent": 0
+---         },
+---         n": { ... },
+---         s": { ... },
+---         v": { ... }
+---       },
+---       "name": "Test",
+---       "priority": 500,
+---       "shortcut": 0
+---     } ]
+---   } ]
+--- <
+---
+--- @param path string
+--- @param modes? any
+--- @return any
+function vim.fn.menu_get(path, modes) end
+
+--- Return information about the specified menu {name} in
+--- mode {mode}. The menu name should be specified without the
+--- shortcut character ('&'). If {name} is "", then the top-level
+--- menu names are returned.
+---
+--- {mode} can be one of these strings:
+---   "n"  Normal
+---   "v"  Visual (including Select)
+---   "o"  Operator-pending
+---   "i"  Insert
+---   "c"  Cmd-line
+---   "s"  Select
+---   "x"  Visual
+---   "t"  Terminal-Job
+---   ""  Normal, Visual and Operator-pending
+---   "!"  Insert and Cmd-line
+--- When {mode} is omitted, the modes for "" are used.
+---
+--- Returns a |Dictionary| containing the following items:
+---   accel    menu item accelerator text |menu-text|
+---   display  display name (name without '&')
+---   enabled  v:true if this menu item is enabled
+---     Refer to |:menu-enable|
+---   icon    name of the icon file (for toolbar)
+---     |toolbar-icon|
+---   iconidx  index of a built-in icon
+---   modes    modes for which the menu is defined. In
+---     addition to the modes mentioned above, these
+---     characters will be used:
+---     " "  Normal, Visual and Operator-pending
+---   name    menu item name.
+---   noremenu  v:true if the {rhs} of the menu item is not
+---     remappable else v:false.
+---   priority  menu order priority |menu-priority|
+---   rhs    right-hand-side of the menu item. The returned
+---     string has special characters translated like
+---     in the output of the ":menu" command listing.
+---     When the {rhs} of a menu item is empty, then
+---     "<Nop>" is returned.
+---   script  v:true if script-local remapping of {rhs} is
+---     allowed else v:false.  See |:menu-script|.
+---   shortcut  shortcut key (character after '&' in
+---     the menu name) |menu-shortcut|
+---   silent  v:true if the menu item is created
+---     with <silent> argument |:menu-silent|
+---   submenus  |List| containing the names of
+---     all the submenus.  Present only if the menu
+---     item has submenus.
+---
+--- Returns an empty dictionary if the menu item is not found.
+---
+--- Examples: >vim
+---   echo menu_info('Edit.Cut')
+---   echo menu_info('File.Save', 'n')
+---
+---   " Display the entire menu hierarchy in a buffer
+---   func ShowMenu(name, pfx)
+---     let m = menu_info(a:name)
+---     call append(line('$'), a:pfx .. m.display)
+---     for child in m->get('submenus', [])
+---       call ShowMenu(a:name .. '.' .. escape(child, '.'),
+---           \ a:pfx .. '    ')
+---     endfor
+---   endfunc
+---   new
+---   for topmenu in menu_info('').submenus
+---     call ShowMenu(topmenu, '')
+---   endfor
+--- <
+---
+--- @param name string
+--- @param mode? string
+--- @return any
+function vim.fn.menu_info(name, mode) end
+
+--- Return the minimum value of all items in {expr}. Example: >vim
+---   echo min([apples, pears, oranges])
+---
+--- <{expr} can be a |List| or a |Dictionary|.  For a Dictionary,
+--- it returns the minimum of all values in the Dictionary.
+--- If {expr} is neither a List nor a Dictionary, or one of the
+--- items in {expr} cannot be used as a Number this results in
+--- an error.  An empty |List| or |Dictionary| results in zero.
+---
+--- @param expr any
+--- @return any
+function vim.fn.min(expr) end
+
+--- Create directory {name}.
+---
+--- When {flags} is present it must be a string.  An empty string
+--- has no effect.
+---
+--- If {flags} contains "p" then intermediate directories are
+--- created as necessary.
+---
+--- If {flags} contains "D" then {name} is deleted at the end of
+--- the current function, as with: >vim
+---   defer delete({name}, 'd')
+--- <
+--- If {flags} contains "R" then {name} is deleted recursively at
+--- the end of the current function, as with: >vim
+---   defer delete({name}, 'rf')
+--- <Note that when {name} has more than one part and "p" is used
+--- some directories may already exist.  Only the first one that
+--- is created and what it contains is scheduled to be deleted.
+--- E.g. when using: >vim
+---   call mkdir('subdir/tmp/autoload', 'pR')
+--- <and "subdir" already exists then "subdir/tmp" will be
+--- scheduled for deletion, like with: >vim
+---   defer delete('subdir/tmp', 'rf')
+--- <
+--- If {prot} is given it is used to set the protection bits of
+--- the new directory.  The default is 0o755 (rwxr-xr-x: r/w for
+--- the user, readable for others).  Use 0o700 to make it
+--- unreadable for others.
+---
+--- {prot} is applied for all parts of {name}.  Thus if you create
+--- /tmp/foo/bar then /tmp/foo will be created with 0o700. Example: >vim
+---   call mkdir($HOME .. "/tmp/foo/bar", "p", 0o700)
+---
+--- <This function is not available in the |sandbox|.
+---
+--- If you try to create an existing directory with {flags} set to
+--- "p" mkdir() will silently exit.
+---
+--- The function result is a Number, which is TRUE if the call was
+--- successful or FALSE if the directory creation failed or partly
+--- failed.
+---
+--- @param name string
+--- @param flags? string
+--- @param prot? any
+--- @return any
+function vim.fn.mkdir(name, flags, prot) end
+
+--- Return a string that indicates the current mode.
+--- If [expr] is supplied and it evaluates to a non-zero Number or
+--- a non-empty String (|non-zero-arg|), then the full mode is
+--- returned, otherwise only the first letter is returned.
+--- Also see |state()|.
+---
+---    n      Normal
+---    no      Operator-pending
+---    nov      Operator-pending (forced charwise |o_v|)
+---    noV      Operator-pending (forced linewise |o_V|)
+---    noCTRL-V Operator-pending (forced blockwise |o_CTRL-V|)
+---     CTRL-V is one character
+---    niI      Normal using |i_CTRL-O| in |Insert-mode|
+---    niR      Normal using |i_CTRL-O| in |Replace-mode|
+---    niV      Normal using |i_CTRL-O| in |Virtual-Replace-mode|
+---    nt      Normal in |terminal-emulator| (insert goes to
+---     Terminal mode)
+---    ntT      Normal using |t_CTRL-\_CTRL-O| in |Terminal-mode|
+---    v      Visual by character
+---    vs      Visual by character using |v_CTRL-O| in Select mode
+---    V      Visual by line
+---    Vs      Visual by line using |v_CTRL-O| in Select mode
+---    CTRL-V   Visual blockwise
+---    CTRL-Vs  Visual blockwise using |v_CTRL-O| in Select mode
+---    s      Select by character
+---    S      Select by line
+---    CTRL-S   Select blockwise
+---    i      Insert
+---    ic      Insert mode completion |compl-generic|
+---    ix      Insert mode |i_CTRL-X| completion
+---    R      Replace |R|
+---    Rc      Replace mode completion |compl-generic|
+---    Rx      Replace mode |i_CTRL-X| completion
+---    Rv      Virtual Replace |gR|
+---    Rvc      Virtual Replace mode completion |compl-generic|
+---    Rvx      Virtual Replace mode |i_CTRL-X| completion
+---    c      Command-line editing
+---    cr      Command-line editing overstrike mode |c_<Insert>|
+---    cv      Vim Ex mode |gQ|
+---    cvr      Vim Ex mode while in overstrike mode |c_<Insert>|
+---    r      Hit-enter prompt
+---    rm      The -- more -- prompt
+---    r?      A |:confirm| query of some sort
+---    !      Shell or external command is executing
+---    t      Terminal mode: keys go to the job
+---
+--- This is useful in the 'statusline' option or RPC calls. In
+--- most other places it always returns "c" or "n".
+--- Note that in the future more modes and more specific modes may
+--- be added. It's better not to compare the whole string but only
+--- the leading character(s).
+--- Also see |visualmode()|.
+---
+--- @return any
+function vim.fn.mode() end
+
+--- Convert a list of Vimscript objects to msgpack. Returned value is a
+--- |readfile()|-style list. When {type} contains "B", a |Blob| is
+--- returned instead. Example: >vim
+---   call writefile(msgpackdump([{}]), 'fname.mpack', 'b')
+--- <or, using a |Blob|: >vim
+---   call writefile(msgpackdump([{}], 'B'), 'fname.mpack')
+--- <
+--- This will write the single 0x80 byte to a `fname.mpack` file
+--- (dictionary with zero items is represented by 0x80 byte in
+--- messagepack).
+---
+--- Limitations:        *E5004* *E5005*
+--- 1. |Funcref|s cannot be dumped.
+--- 2. Containers that reference themselves cannot be dumped.
+--- 3. Dictionary keys are always dumped as STR strings.
+--- 4. Other strings and |Blob|s are always dumped as BIN strings.
+--- 5. Points 3. and 4. do not apply to |msgpack-special-dict|s.
+---
+--- @param list any
+--- @param type? any
+--- @return any
+function vim.fn.msgpackdump(list, type) end
+
+--- Convert a |readfile()|-style list or a |Blob| to a list of
+--- Vimscript objects.
+--- Example: >vim
+---   let fname = expand('~/.config/nvim/shada/main.shada')
+---   let mpack = readfile(fname, 'b')
+---   let shada_objects = msgpackparse(mpack)
+--- <This will read ~/.config/nvim/shada/main.shada file to
+--- `shada_objects` list.
+---
+--- Limitations:
+--- 1. Mapping ordering is not preserved unless messagepack
+---    mapping is dumped using generic mapping
+---    (|msgpack-special-map|).
+--- 2. Since the parser aims to preserve all data untouched
+---    (except for 1.) some strings are parsed to
+---    |msgpack-special-dict| format which is not convenient to
+---    use.
+---           *msgpack-special-dict*
+--- Some messagepack strings may be parsed to special
+--- dictionaries. Special dictionaries are dictionaries which
+---
+--- 1. Contain exactly two keys: `_TYPE` and `_VAL`.
+--- 2. `_TYPE` key is one of the types found in |v:msgpack_types|
+---    variable.
+--- 3. Value for `_VAL` has the following format (Key column
+---    contains name of the key from |v:msgpack_types|):
+---
+--- Key  Value ~
+--- nil  Zero, ignored when dumping.  Not returned by
+---   |msgpackparse()| since |v:null| was introduced.
+--- boolean  One or zero.  When dumping it is only checked that
+---   value is a |Number|.  Not returned by |msgpackparse()|
+---   since |v:true| and |v:false| were introduced.
+--- integer  |List| with four numbers: sign (-1 or 1), highest two
+---   bits, number with bits from 62nd to 31st, lowest 31
+---   bits. I.e. to get actual number one will need to use
+---   code like >
+---     _VAL[0] * ((_VAL[1] << 62)
+---                & (_VAL[2] << 31)
+---                & _VAL[3])
+--- <  Special dictionary with this type will appear in
+---   |msgpackparse()| output under one of the following
+---   circumstances:
+---   1. |Number| is 32-bit and value is either above
+---      INT32_MAX or below INT32_MIN.
+---   2. |Number| is 64-bit and value is above INT64_MAX. It
+---      cannot possibly be below INT64_MIN because msgpack
+---      C parser does not support such values.
+--- float  |Float|. This value cannot possibly appear in
+---   |msgpackparse()| output.
+--- string  |readfile()|-style list of strings. This value will
+---   appear in |msgpackparse()| output if string contains
+---   zero byte or if string is a mapping key and mapping is
+---   being represented as special dictionary for other
+---   reasons.
+--- binary  |String|, or |Blob| if binary string contains zero
+---   byte. This value cannot appear in |msgpackparse()|
+---   output since blobs were introduced.
+--- array  |List|. This value cannot appear in |msgpackparse()|
+---   output.
+---           *msgpack-special-map*
+--- map  |List| of |List|s with two items (key and value) each.
+---   This value will appear in |msgpackparse()| output if
+---   parsed mapping contains one of the following keys:
+---   1. Any key that is not a string (including keys which
+---      are binary strings).
+---   2. String with NUL byte inside.
+---   3. Duplicate key.
+---   4. Empty key.
+--- ext  |List| with two values: first is a signed integer
+---   representing extension type. Second is
+---   |readfile()|-style list of strings.
+---
+--- @param data any
+--- @return any
+function vim.fn.msgpackparse(data) end
+
+--- Return the line number of the first line at or below {lnum}
+--- that is not blank.  Example: >vim
+---   if getline(nextnonblank(1)) =~ "Java" | endif
+--- <When {lnum} is invalid or there is no non-blank line at or
+--- below it, zero is returned.
+--- {lnum} is used like with |getline()|.
+--- See also |prevnonblank()|.
+---
+--- @param lnum integer
+--- @return any
+function vim.fn.nextnonblank(lnum) end
+
+--- Return a string with a single character, which has the number
+--- value {expr}.  Examples: >vim
+---   echo nr2char(64)    " returns '\@'
+---   echo nr2char(32)    " returns ' '
+--- <Example for "utf-8": >vim
+---   echo nr2char(300)    " returns I with bow character
+--- <
+--- UTF-8 encoding is always used, {utf8} option has no effect,
+--- and exists only for backwards-compatibility.
+--- Note that a NUL character in the file is specified with
+--- nr2char(10), because NULs are represented with newline
+--- characters.  nr2char(0) is a real NUL and terminates the
+--- string, thus results in an empty string.
+---
+--- @param expr any
+--- @param utf8? any
+--- @return any
+function vim.fn.nr2char(expr, utf8) end
+
+--- Bitwise OR on the two arguments.  The arguments are converted
+--- to a number.  A List, Dict or Float argument causes an error.
+--- Also see `and()` and `xor()`.
+--- Example: >vim
+---   let bits = or(bits, 0x80)
+---
+--- <Rationale: The reason this is a function and not using the "|"
+--- character like many languages, is that Vi has always used "|"
+--- to separate commands.  In many places it would not be clear if
+--- "|" is an operator or a command separator.
+---
+--- @param expr any
+--- @param expr1 any
+--- @return any
+vim.fn['or'] = function(expr, expr1) end
+
+--- Shorten directory names in the path {path} and return the
+--- result.  The tail, the file name, is kept as-is.  The other
+--- components in the path are reduced to {len} letters in length.
+--- If {len} is omitted or smaller than 1 then 1 is used (single
+--- letters).  Leading '~' and '.' characters are kept.  Examples: >vim
+---   echo pathshorten('~/.config/nvim/autoload/file1.vim')
+--- <  ~/.c/n/a/file1.vim ~
+--- >vim
+---   echo pathshorten('~/.config/nvim/autoload/file2.vim', 2)
+--- <  ~/.co/nv/au/file2.vim ~
+--- It doesn't matter if the path exists or not.
+--- Returns an empty string on error.
+---
+--- @param path string
+--- @param len? any
+--- @return any
+function vim.fn.pathshorten(path, len) end
+
+--- Evaluate |perl| expression {expr} and return its result
+--- converted to Vim data structures.
+--- Numbers and strings are returned as they are (strings are
+--- copied though).
+--- Lists are represented as Vim |List| type.
+--- Dictionaries are represented as Vim |Dictionary| type,
+--- non-string keys result in error.
+---
+--- Note: If you want an array or hash, {expr} must return a
+--- reference to it.
+--- Example: >vim
+---   echo perleval('[1 .. 4]')
+--- <  [1, 2, 3, 4]
+---
+--- @param expr any
+--- @return any
+function vim.fn.perleval(expr) end
+
+--- Return the power of {x} to the exponent {y} as a |Float|.
+--- {x} and {y} must evaluate to a |Float| or a |Number|.
+--- Returns 0.0 if {x} or {y} is not a |Float| or a |Number|.
+--- Examples: >vim
+---   echo pow(3, 3)
+--- <  27.0 >vim
+---   echo pow(2, 16)
+--- <  65536.0 >vim
+---   echo pow(32, 0.20)
+--- <  2.0
+---
+--- @param x any
+--- @param y any
+--- @return any
+function vim.fn.pow(x, y) end
+
+--- Return the line number of the first line at or above {lnum}
+--- that is not blank.  Example: >vim
+---   let ind = indent(prevnonblank(v:lnum - 1))
+--- <When {lnum} is invalid or there is no non-blank line at or
+--- above it, zero is returned.
+--- {lnum} is used like with |getline()|.
+--- Also see |nextnonblank()|.
+---
+--- @param lnum integer
+--- @return any
+function vim.fn.prevnonblank(lnum) end
+
+--- Return a String with {fmt}, where "%" items are replaced by
+--- the formatted form of their respective arguments.  Example: >vim
+---   echo printf("%4d: E%d %.30s", lnum, errno, msg)
+--- <May result in:
+---   "  99: E42 asdfasdfasdfasdfasdfasdfasdfas" ~
+---
+--- When used as a |method| the base is passed as the second
+--- argument: >vim
+---   Compute()->printf("result: %d")
+--- <
+--- You can use `call()` to pass the items as a list.
+---
+--- Often used items are:
+---   %s  string
+---   %6S  string right-aligned in 6 display cells
+---   %6s  string right-aligned in 6 bytes
+---   %.9s  string truncated to 9 bytes
+---   %c  single byte
+---   %d  decimal number
+---   %5d  decimal number padded with spaces to 5 characters
+---   %b  binary number
+---   %08b  binary number padded with zeros to at least 8 characters
+---   %B  binary number using upper case letters
+---   %x  hex number
+---   %04x  hex number padded with zeros to at least 4 characters
+---   %X  hex number using upper case letters
+---   %o  octal number
+---   %f  floating point number as 12.23, inf, -inf or nan
+---   %F  floating point number as 12.23, INF, -INF or NAN
+---   %e  floating point number as 1.23e3, inf, -inf or nan
+---   %E  floating point number as 1.23E3, INF, -INF or NAN
+---   %g  floating point number, as %f or %e depending on value
+---   %G  floating point number, as %F or %E depending on value
+---   %%  the % character itself
+---   %p  representation of the pointer to the container
+---
+--- Conversion specifications start with '%' and end with the
+--- conversion type.  All other characters are copied unchanged to
+--- the result.
+---
+--- The "%" starts a conversion specification.  The following
+--- arguments appear in sequence:
+---
+---   % [pos-argument] [flags] [field-width] [.precision] type
+---
+--- pos-argument
+---   At most one positional argument specifier. These
+---   take the form {n$}, where n is >= 1.
+---
+--- flags
+---   Zero or more of the following flags:
+---
+---     #        The value should be converted to an "alternate
+---         form".  For c, d, and s conversions, this option
+---         has no effect.  For o conversions, the precision
+---         of the number is increased to force the first
+---         character of the output string to a zero (except
+---         if a zero value is printed with an explicit
+---         precision of zero).
+---         For x and X conversions, a non-zero result has
+---         the string "0x" (or "0X" for X conversions)
+---         prepended to it.
+---
+---     0 (zero)  Zero padding.  For all conversions the converted
+---         value is padded on the left with zeros rather
+---         than blanks.  If a precision is given with a
+---         numeric conversion (d, o, x, and X), the 0 flag
+---         is ignored.
+---
+---     -        A negative field width flag; the converted value
+---         is to be left adjusted on the field boundary.
+---         The converted value is padded on the right with
+---         blanks, rather than on the left with blanks or
+---         zeros.  A - overrides a 0 if both are given.
+---
+---     ' ' (space)  A blank should be left before a positive
+---         number produced by a signed conversion (d).
+---
+---     +        A sign must always be placed before a number
+---         produced by a signed conversion.  A + overrides
+---         a space if both are used.
+---
+--- field-width
+---   An optional decimal digit string specifying a minimum
+---   field width.  If the converted value has fewer bytes
+---   than the field width, it will be padded with spaces on
+---   the left (or right, if the left-adjustment flag has
+---   been given) to fill out the field width.  For the S
+---   conversion the count is in cells.
+---
+--- .precision
+---   An optional precision, in the form of a period '.'
+---   followed by an optional digit string.  If the digit
+---   string is omitted, the precision is taken as zero.
+---   This gives the minimum number of digits to appear for
+---   d, o, x, and X conversions, the maximum number of
+---   bytes to be printed from a string for s conversions,
+---   or the maximum number of cells to be printed from a
+---   string for S conversions.
+---   For floating point it is the number of digits after
+---   the decimal point.
+---
+--- type
+---   A character that specifies the type of conversion to
+---   be applied, see below.
+---
+--- A field width or precision, or both, may be indicated by an
+--- asterisk "*" instead of a digit string.  In this case, a
+--- Number argument supplies the field width or precision.  A
+--- negative field width is treated as a left adjustment flag
+--- followed by a positive field width; a negative precision is
+--- treated as though it were missing.  Example: >vim
+---   echo printf("%d: %.*s", nr, width, line)
+--- <This limits the length of the text used from "line" to
+--- "width" bytes.
+---
+--- If the argument to be formatted is specified using a posional
+--- argument specifier, and a '*' is used to indicate that a
+--- number argument is to be used to specify the width or
+--- precision, the argument(s) to be used must also be specified
+--- using a {n$} positional argument specifier. See |printf-$|.
+---
+--- The conversion specifiers and their meanings are:
+---
+---     *printf-d* *printf-b* *printf-B* *printf-o* *printf-x* *printf-X*
+--- dbBoxX  The Number argument is converted to signed decimal (d),
+---   unsigned binary (b and B), unsigned octal (o), or
+---   unsigned hexadecimal (x and X) notation.  The letters
+---   "abcdef" are used for x conversions; the letters
+---   "ABCDEF" are used for X conversions.  The precision, if
+---   any, gives the minimum number of digits that must
+---   appear; if the converted value requires fewer digits, it
+---   is padded on the left with zeros.  In no case does a
+---   non-existent or small field width cause truncation of a
+---   numeric field; if the result of a conversion is wider
+---   than the field width, the field is expanded to contain
+---   the conversion result.
+---   The 'h' modifier indicates the argument is 16 bits.
+---   The 'l' modifier indicates the argument is a long
+---   integer.  The size will be 32 bits or 64 bits
+---   depending on your platform.
+---   The "ll" modifier indicates the argument is 64 bits.
+---   The b and B conversion specifiers never take a width
+---   modifier and always assume their argument is a 64 bit
+---   integer.
+---   Generally, these modifiers are not useful. They are
+---   ignored when type is known from the argument.
+---
+--- i  alias for d
+--- D  alias for ld
+--- U  alias for lu
+--- O  alias for lo
+---
+---           *printf-c*
+--- c  The Number argument is converted to a byte, and the
+---   resulting character is written.
+---
+---           *printf-s*
+--- s  The text of the String argument is used.  If a
+---   precision is specified, no more bytes than the number
+---   specified are used.
+---   If the argument is not a String type, it is
+---   automatically converted to text with the same format
+---   as ":echo".
+---           *printf-S*
+--- S  The text of the String argument is used.  If a
+---   precision is specified, no more display cells than the
+---   number specified are used.
+---
+---           *printf-f* *E807*
+--- f F  The Float argument is converted into a string of the
+---   form 123.456.  The precision specifies the number of
+---   digits after the decimal point.  When the precision is
+---   zero the decimal point is omitted.  When the precision
+---   is not specified 6 is used.  A really big number
+---   (out of range or dividing by zero) results in "inf"
+---    or "-inf" with %f (INF or -INF with %F).
+---    "0.0 / 0.0" results in "nan" with %f (NAN with %F).
+---   Example: >vim
+---     echo printf("%.2f", 12.115)
+--- <    12.12
+---   Note that roundoff depends on the system libraries.
+---   Use |round()| when in doubt.
+---
+---           *printf-e* *printf-E*
+--- e E  The Float argument is converted into a string of the
+---   form 1.234e+03 or 1.234E+03 when using 'E'.  The
+---   precision specifies the number of digits after the
+---   decimal point, like with 'f'.
+---
+---           *printf-g* *printf-G*
+--- g G  The Float argument is converted like with 'f' if the
+---   value is between 0.001 (inclusive) and 10000000.0
+---   (exclusive).  Otherwise 'e' is used for 'g' and 'E'
+---   for 'G'.  When no precision is specified superfluous
+---   zeroes and '+' signs are removed, except for the zero
+---   immediately after the decimal point.  Thus 10000000.0
+---   results in 1.0e7.
+---
+---           *printf-%*
+--- %  A '%' is written.  No argument is converted.  The
+---   complete conversion specification is "%%".
+---
+--- When a Number argument is expected a String argument is also
+--- accepted and automatically converted.
+--- When a Float or String argument is expected a Number argument
+--- is also accepted and automatically converted.
+--- Any other argument type results in an error message.
+---
+---           *E766* *E767*
+--- The number of {exprN} arguments must exactly match the number
+--- of "%" items.  If there are not sufficient or too many
+--- arguments an error is given.  Up to 18 arguments can be used.
+---
+---           *printf-$*
+--- In certain languages, error and informative messages are
+--- more readable when the order of words is different from the
+--- corresponding message in English. To accommodate translations
+--- having a different word order, positional arguments may be
+--- used to indicate this. For instance: >vim
+---
+---     #, c-format
+---     msgid "%s returning %s"
+---     msgstr "waarde %2$s komt terug van %1$s"
+--- <
+--- In this example, the sentence has its 2 string arguments
+--- reversed in the output. >vim
+---
+---     echo printf(
+---   "In The Netherlands, vim's creator's name is: %1$s %2$s",
+---   "Bram", "Moolenaar")
+--- <    In The Netherlands, vim's creator's name is: Bram Moolenaar >vim
+---
+---     echo printf(
+---   "In Belgium, vim's creator's name is: %2$s %1$s",
+---   "Bram", "Moolenaar")
+--- <    In Belgium, vim's creator's name is: Moolenaar Bram
+---
+--- Width (and precision) can be specified using the '*' specifier.
+--- In this case, you must specify the field width position in the
+--- argument list. >vim
+---
+---     echo printf("%1$*2$.*3$d", 1, 2, 3)
+--- <    001 >vim
+---     echo printf("%2$*3$.*1$d", 1, 2, 3)
+--- <      2 >vim
+---     echo printf("%3$*1$.*2$d", 1, 2, 3)
+--- <    03 >vim
+---     echo printf("%1$*2$.*3$g", 1.4142, 2, 3)
+--- <    1.414
+---
+--- You can mix specifying the width and/or precision directly
+--- and via positional arguments: >vim
+---
+---     echo printf("%1$4.*2$f", 1.4142135, 6)
+--- <    1.414214 >vim
+---     echo printf("%1$*2$.4f", 1.4142135, 6)
+--- <    1.4142 >vim
+---     echo printf("%1$*2$.*3$f", 1.4142135, 6, 2)
+--- <      1.41
+---
+---           *E1500*
+--- You cannot mix positional and non-positional arguments: >vim
+---     echo printf("%s%1$s", "One", "Two")
+--- <    E1500: Cannot mix positional and non-positional arguments:
+---     %s%1$s
+---
+---           *E1501*
+--- You cannot skip a positional argument in a format string: >vim
+---     echo printf("%3$s%1$s", "One", "Two", "Three")
+--- <    E1501: format argument 2 unused in $-style format:
+---     %3$s%1$s
+---
+---           *E1502*
+--- You can re-use a [field-width] (or [precision]) argument: >vim
+---     echo printf("%1$d at width %2$d is: %01$*2$d", 1, 2)
+--- <    1 at width 2 is: 01
+---
+--- However, you can't use it as a different type: >vim
+---     echo printf("%1$d at width %2$ld is: %01$*2$d", 1, 2)
+--- <    E1502: Positional argument 2 used as field width reused as
+---     different type: long int/int
+---
+---           *E1503*
+--- When a positional argument is used, but not the correct number
+--- or arguments is given, an error is raised: >vim
+---     echo printf("%1$d at width %2$d is: %01$*2$.*3$d", 1, 2)
+--- <    E1503: Positional argument 3 out of bounds: %1$d at width
+---     %2$d is: %01$*2$.*3$d
+---
+--- Only the first error is reported: >vim
+---     echo printf("%01$*2$.*3$d %4$d", 1, 2)
+--- <    E1503: Positional argument 3 out of bounds: %01$*2$.*3$d
+---     %4$d
+---
+---           *E1504*
+--- A positional argument can be used more than once: >vim
+---     echo printf("%1$s %2$s %1$s", "One", "Two")
+--- <    One Two One
+---
+--- However, you can't use a different type the second time: >vim
+---     echo printf("%1$s %2$s %1$d", "One", "Two")
+--- <    E1504: Positional argument 1 type used inconsistently:
+---     int/string
+---
+---           *E1505*
+--- Various other errors that lead to a format string being
+--- wrongly formatted lead to: >vim
+---     echo printf("%1$d at width %2$d is: %01$*2$.3$d", 1, 2)
+--- <    E1505: Invalid format specifier: %1$d at width %2$d is:
+---     %01$*2$.3$d
+---
+---           *E1507*
+--- This internal error indicates that the logic to parse a
+--- positional format argument ran into a problem that couldn't be
+--- otherwise reported.  Please file a bug against Vim if you run
+--- into this, copying the exact format string and parameters that
+--- were used.
+---
+--- @param fmt any
+--- @param expr1? any
+--- @return any
+function vim.fn.printf(fmt, expr1) end
+
+--- Returns the effective prompt text for buffer {buf}.  {buf} can
+--- be a buffer name or number.  See |prompt-buffer|.
+---
+--- If the buffer doesn't exist or isn't a prompt buffer, an empty
+--- string is returned.
+---
+--- @param buf any
+--- @return any
+function vim.fn.prompt_getprompt(buf) end
+
+--- Set prompt callback for buffer {buf} to {expr}.  When {expr}
+--- is an empty string the callback is removed.  This has only
+--- effect if {buf} has 'buftype' set to "prompt".
+---
+--- The callback is invoked when pressing Enter.  The current
+--- buffer will always be the prompt buffer.  A new line for a
+--- prompt is added before invoking the callback, thus the prompt
+--- for which the callback was invoked will be in the last but one
+--- line.
+--- If the callback wants to add text to the buffer, it must
+--- insert it above the last line, since that is where the current
+--- prompt is.  This can also be done asynchronously.
+--- The callback is invoked with one argument, which is the text
+--- that was entered at the prompt.  This can be an empty string
+--- if the user only typed Enter.
+--- Example: >vim
+---    func s:TextEntered(text)
+---      if a:text == 'exit' || a:text == 'quit'
+---        stopinsert
+---        " Reset 'modified' to allow the buffer to be closed.
+---        " We assume there is nothing useful to be saved.
+---        set nomodified
+---        close
+---      else
+---        " Do something useful with "a:text".  In this example
+---        " we just repeat it.
+---        call append(line('$') - 1, 'Entered: "' .. a:text .. '"')
+---      endif
+---    endfunc
+---    call prompt_setcallback(bufnr(), function('s:TextEntered'))
+---
+--- @param buf any
+--- @param expr any
+--- @return any
+function vim.fn.prompt_setcallback(buf, expr) end
+
+--- Set a callback for buffer {buf} to {expr}.  When {expr} is an
+--- empty string the callback is removed.  This has only effect if
+--- {buf} has 'buftype' set to "prompt".
+---
+--- This callback will be invoked when pressing CTRL-C in Insert
+--- mode.  Without setting a callback Vim will exit Insert mode,
+--- as in any buffer.
+---
+--- @param buf any
+--- @param expr any
+--- @return any
+function vim.fn.prompt_setinterrupt(buf, expr) end
+
+--- Set prompt for buffer {buf} to {text}.  You most likely want
+--- {text} to end in a space.
+--- The result is only visible if {buf} has 'buftype' set to
+--- "prompt".  Example: >vim
+---   call prompt_setprompt(bufnr(''), 'command: ')
+--- <
+---
+--- @param buf any
+--- @param text any
+--- @return any
+function vim.fn.prompt_setprompt(buf, text) end
+
+--- If the popup menu (see |ins-completion-menu|) is not visible,
+--- returns an empty |Dictionary|, otherwise, returns a
+--- |Dictionary| with the following keys:
+---   height    nr of items visible
+---   width    screen cells
+---   row    top screen row (0 first row)
+---   col    leftmost screen column (0 first col)
+---   size    total nr of items
+---   scrollbar  |TRUE| if scrollbar is visible
+---
+--- The values are the same as in |v:event| during |CompleteChanged|.
+---
+--- @return any
+function vim.fn.pum_getpos() end
+
+--- Returns non-zero when the popup menu is visible, zero
+--- otherwise.  See |ins-completion-menu|.
+--- This can be used to avoid some things that would remove the
+--- popup menu.
+---
+--- @return any
+function vim.fn.pumvisible() end
+
+--- Evaluate Python expression {expr} and return its result
+--- converted to Vim data structures.
+--- Numbers and strings are returned as they are (strings are
+--- copied though, Unicode strings are additionally converted to
+--- UTF-8).
+--- Lists are represented as Vim |List| type.
+--- Dictionaries are represented as Vim |Dictionary| type with
+--- keys converted to strings.
+---
+--- @param expr any
+--- @return any
+function vim.fn.py3eval(expr) end
+
+--- Evaluate Python expression {expr} and return its result
+--- converted to Vim data structures.
+--- Numbers and strings are returned as they are (strings are
+--- copied though).
+--- Lists are represented as Vim |List| type.
+--- Dictionaries are represented as Vim |Dictionary| type,
+--- non-string keys result in error.
+---
+--- @param expr any
+--- @return any
+function vim.fn.pyeval(expr) end
+
+--- Evaluate Python expression {expr} and return its result
+--- converted to Vim data structures.
+--- Uses Python 2 or 3, see |python_x| and 'pyxversion'.
+--- See also: |pyeval()|, |py3eval()|
+---
+--- @param expr any
+--- @return any
+function vim.fn.pyxeval(expr) end
+
+--- Return a pseudo-random Number generated with an xoshiro128**
+--- algorithm using seed {expr}.  The returned number is 32 bits,
+--- also on 64 bits systems, for consistency.
+--- {expr} can be initialized by |srand()| and will be updated by
+--- rand().  If {expr} is omitted, an internal seed value is used
+--- and updated.
+--- Returns -1 if {expr} is invalid.
+---
+--- Examples: >vim
+---   echo rand()
+---   let seed = srand()
+---   echo rand(seed)
+---   echo rand(seed) % 16  " random number 0 - 15
+--- <
+---
+--- @param expr? any
+--- @return any
+function vim.fn.rand(expr) end
+
+--- Returns a |List| with Numbers:
+--- - If only {expr} is specified: [0, 1, ..., {expr} - 1]
+--- - If {max} is specified: [{expr}, {expr} + 1, ..., {max}]
+--- - If {stride} is specified: [{expr}, {expr} + {stride}, ...,
+---   {max}] (increasing {expr} with {stride} each time, not
+---   producing a value past {max}).
+--- When the maximum is one before the start the result is an
+--- empty list.  When the maximum is more than one before the
+--- start this is an error.
+--- Examples: >vim
+---   echo range(4)    " [0, 1, 2, 3]
+---   echo range(2, 4)  " [2, 3, 4]
+---   echo range(2, 9, 3)  " [2, 5, 8]
+---   echo range(2, -2, -1)  " [2, 1, 0, -1, -2]
+---   echo range(0)    " []
+---   echo range(2, 0)  " error!
+--- <
+---
+--- @param expr any
+--- @param max? any
+--- @param stride? any
+--- @return any
+function vim.fn.range(expr, max, stride) end
+
+--- Read file {fname} in binary mode and return a |Blob|.
+--- If {offset} is specified, read the file from the specified
+--- offset.  If it is a negative value, it is used as an offset
+--- from the end of the file.  E.g., to read the last 12 bytes: >vim
+---   echo readblob('file.bin', -12)
+--- <If {size} is specified, only the specified size will be read.
+--- E.g. to read the first 100 bytes of a file: >vim
+---   echo readblob('file.bin', 0, 100)
+--- <If {size} is -1 or omitted, the whole data starting from
+--- {offset} will be read.
+--- This can be also used to read the data from a character device
+--- on Unix when {size} is explicitly set.  Only if the device
+--- supports seeking {offset} can be used.  Otherwise it should be
+--- zero.  E.g. to read 10 bytes from a serial console: >vim
+---   echo readblob('/dev/ttyS0', 0, 10)
+--- <When the file can't be opened an error message is given and
+--- the result is an empty |Blob|.
+--- When the offset is beyond the end of the file the result is an
+--- empty blob.
+--- When trying to read more bytes than are available the result
+--- is truncated.
+--- Also see |readfile()| and |writefile()|.
+---
+--- @param fname string
+--- @param offset? any
+--- @param size? any
+--- @return any
+function vim.fn.readblob(fname, offset, size) end
+
+--- Return a list with file and directory names in {directory}.
+--- You can also use |glob()| if you don't need to do complicated
+--- things, such as limiting the number of matches.
+---
+--- When {expr} is omitted all entries are included.
+--- When {expr} is given, it is evaluated to check what to do:
+---   If {expr} results in -1 then no further entries will
+---   be handled.
+---   If {expr} results in 0 then this entry will not be
+---   added to the list.
+---   If {expr} results in 1 then this entry will be added
+---   to the list.
+--- Each time {expr} is evaluated |v:val| is set to the entry name.
+--- When {expr} is a function the name is passed as the argument.
+--- For example, to get a list of files ending in ".txt": >vim
+---   echo readdir(dirname, {n -> n =~ '.txt$'})
+--- <To skip hidden and backup files: >vim
+---   echo readdir(dirname, {n -> n !~ '^\.\|\~$'})
+---
+--- <If you want to get a directory tree: >vim
+---   function! s:tree(dir)
+---       return {a:dir : map(readdir(a:dir),
+---       \ {_, x -> isdirectory(x) ?
+---       \          {x : s:tree(a:dir .. '/' .. x)} : x})}
+---   endfunction
+---   echo s:tree(".")
+--- <
+--- Returns an empty List on error.
+---
+--- @param directory any
+--- @param expr? any
+--- @return any
+function vim.fn.readdir(directory, expr) end
+
+--- Read file {fname} and return a |List|, each line of the file
+--- as an item.  Lines are broken at NL characters.  Macintosh
+--- files separated with CR will result in a single long line
+--- (unless a NL appears somewhere).
+--- All NUL characters are replaced with a NL character.
+--- When {type} contains "b" binary mode is used:
+--- - When the last line ends in a NL an extra empty list item is
+---   added.
+--- - No CR characters are removed.
+--- Otherwise:
+--- - CR characters that appear before a NL are removed.
+--- - Whether the last line ends in a NL or not does not matter.
+--- - Any UTF-8 byte order mark is removed from the text.
+--- When {max} is given this specifies the maximum number of lines
+--- to be read.  Useful if you only want to check the first ten
+--- lines of a file: >vim
+---   for line in readfile(fname, '', 10)
+---     if line =~ 'Date' | echo line | endif
+---   endfor
+--- <When {max} is negative -{max} lines from the end of the file
+--- are returned, or as many as there are.
+--- When {max} is zero the result is an empty list.
+--- Note that without {max} the whole file is read into memory.
+--- Also note that there is no recognition of encoding.  Read a
+--- file into a buffer if you need to.
+--- Deprecated (use |readblob()| instead): When {type} contains
+--- "B" a |Blob| is returned with the binary data of the file
+--- unmodified.
+--- When the file can't be opened an error message is given and
+--- the result is an empty list.
+--- Also see |writefile()|.
+---
+--- @param fname string
+--- @param type? any
+--- @param max? any
+--- @return any
+function vim.fn.readfile(fname, type, max) end
+
+--- {func} is called for every item in {object}, which can be a
+--- |String|, |List| or a |Blob|.  {func} is called with two
+--- arguments: the result so far and current item.  After
+--- processing all items the result is returned.
+---
+--- {initial} is the initial result.  When omitted, the first item
+--- in {object} is used and {func} is first called for the second
+--- item.  If {initial} is not given and {object} is empty no
+--- result can be computed, an E998 error is given.
+---
+--- Examples: >vim
+---   echo reduce([1, 3, 5], { acc, val -> acc + val })
+---   echo reduce(['x', 'y'], { acc, val -> acc .. val }, 'a')
+---   echo reduce(0z1122, { acc, val -> 2 * acc + val })
+---   echo reduce('xyz', { acc, val -> acc .. ',' .. val })
+--- <
+---
+--- @param object any
+--- @param func any
+--- @param initial? any
+--- @return any
+function vim.fn.reduce(object, func, initial) end
+
+--- Returns the single letter name of the register being executed.
+--- Returns an empty string when no register is being executed.
+--- See |\@|.
+---
+--- @return any
+function vim.fn.reg_executing() end
+
+--- Returns the single letter name of the last recorded register.
+--- Returns an empty string when nothing was recorded yet.
+--- See |q| and |Q|.
+---
+--- @return any
+function vim.fn.reg_recorded() end
+
+--- Returns the single letter name of the register being recorded.
+--- Returns an empty string when not recording.  See |q|.
+---
+--- @return any
+function vim.fn.reg_recording() end
+
+--- @return any
+function vim.fn.reltime() end
+
+--- @param start? any
+--- @return any
+function vim.fn.reltime(start) end
+
+--- Return an item that represents a time value.  The item is a
+--- list with items that depend on the system.
+--- The item can be passed to |reltimestr()| to convert it to a
+--- string or |reltimefloat()| to convert to a Float.
+---
+--- Without an argument it returns the current "relative time", an
+--- implementation-defined value meaningful only when used as an
+--- argument to |reltime()|, |reltimestr()| and |reltimefloat()|.
+---
+--- With one argument it returns the time passed since the time
+--- specified in the argument.
+--- With two arguments it returns the time passed between {start}
+--- and {end}.
+---
+--- The {start} and {end} arguments must be values returned by
+--- reltime().  Returns zero on error.
+---
+--- Note: |localtime()| returns the current (non-relative) time.
+---
+--- @param start? any
+--- @param end_? any
+--- @return any
+function vim.fn.reltime(start, end_) end
+
+--- Return a Float that represents the time value of {time}.
+--- Unit of time is seconds.
+--- Example:
+---   let start = reltime()
+---   call MyFunction()
+---   let seconds = reltimefloat(reltime(start))
+--- See the note of reltimestr() about overhead.
+--- Also see |profiling|.
+--- If there is an error an empty string is returned
+---
+--- @param time any
+--- @return any
+function vim.fn.reltimefloat(time) end
+
+--- Return a String that represents the time value of {time}.
+--- This is the number of seconds, a dot and the number of
+--- microseconds.  Example: >vim
+---   let start = reltime()
+---   call MyFunction()
+---   echo reltimestr(reltime(start))
+--- <Note that overhead for the commands will be added to the time.
+--- Leading spaces are used to make the string align nicely.  You
+--- can use split() to remove it. >vim
+---   echo split(reltimestr(reltime(start)))[0]
+--- <Also see |profiling|.
+--- If there is an error an empty string is returned
+---
+--- @param time any
+--- @return any
+function vim.fn.reltimestr(time) end
+
+--- @param list any
+--- @param idx integer
+--- @return any
+function vim.fn.remove(list, idx) end
+
+--- Without {end}: Remove the item at {idx} from |List| {list} and
+--- return the item.
+--- With {end}: Remove items from {idx} to {end} (inclusive) and
+--- return a |List| with these items.  When {idx} points to the same
+--- item as {end} a list with one item is returned.  When {end}
+--- points to an item before {idx} this is an error.
+--- See |list-index| for possible values of {idx} and {end}.
+--- Returns zero on error.
+--- Example: >vim
+---   echo "last item: " .. remove(mylist, -1)
+---   call remove(mylist, 0, 9)
+--- <
+--- Use |delete()| to remove a file.
+---
+--- @param list any
+--- @param idx integer
+--- @param end_? any
+--- @return any
+function vim.fn.remove(list, idx, end_) end
+
+--- @param blob any
+--- @param idx integer
+--- @return any
+function vim.fn.remove(blob, idx) end
+
+--- Without {end}: Remove the byte at {idx} from |Blob| {blob} and
+--- return the byte.
+--- With {end}: Remove bytes from {idx} to {end} (inclusive) and
+--- return a |Blob| with these bytes.  When {idx} points to the same
+--- byte as {end} a |Blob| with one byte is returned.  When {end}
+--- points to a byte before {idx} this is an error.
+--- Returns zero on error.
+--- Example: >vim
+---   echo "last byte: " .. remove(myblob, -1)
+---   call remove(mylist, 0, 9)
+--- <
+---
+--- @param blob any
+--- @param idx integer
+--- @param end_? any
+--- @return any
+function vim.fn.remove(blob, idx, end_) end
+
+--- Remove the entry from {dict} with key {key} and return it.
+--- Example: >vim
+---   echo "removed " .. remove(dict, "one")
+--- <If there is no {key} in {dict} this is an error.
+--- Returns zero on error.
+---
+--- @param dict any
+--- @param key any
+--- @return any
+function vim.fn.remove(dict, key) end
+
+--- Rename the file by the name {from} to the name {to}.  This
+--- should also work to move files across file systems.  The
+--- result is a Number, which is 0 if the file was renamed
+--- successfully, and non-zero when the renaming failed.
+--- NOTE: If {to} exists it is overwritten without warning.
+--- This function is not available in the |sandbox|.
+---
+--- @param from any
+--- @param to any
+--- @return any
+function vim.fn.rename(from, to) end
+
+--- Repeat {expr} {count} times and return the concatenated
+--- result.  Example: >vim
+---   let separator = repeat('-', 80)
+--- <When {count} is zero or negative the result is empty.
+--- When {expr} is a |List| or a |Blob| the result is {expr}
+--- concatenated {count} times.  Example: >vim
+---   let longlist = repeat(['a', 'b'], 3)
+--- <Results in ['a', 'b', 'a', 'b', 'a', 'b'].
+---
+--- @param expr any
+--- @param count any
+--- @return any
+vim.fn['repeat'] = function(expr, count) end
+
+--- On MS-Windows, when {filename} is a shortcut (a .lnk file),
+--- returns the path the shortcut points to in a simplified form.
+--- On Unix, repeat resolving symbolic links in all path
+--- components of {filename} and return the simplified result.
+--- To cope with link cycles, resolving of symbolic links is
+--- stopped after 100 iterations.
+--- On other systems, return the simplified {filename}.
+--- The simplification step is done as by |simplify()|.
+--- resolve() keeps a leading path component specifying the
+--- current directory (provided the result is still a relative
+--- path name) and also keeps a trailing path separator.
+---
+--- @param filename any
+--- @return any
+function vim.fn.resolve(filename) end
+
+--- Reverse the order of items in {object}.  {object} can be a
+--- |List|, a |Blob| or a |String|.  For a List and a Blob the
+--- items are reversed in-place and {object} is returned.
+--- For a String a new String is returned.
+--- Returns zero if {object} is not a List, Blob or a String.
+--- If you want a List or Blob to remain unmodified make a copy
+--- first: >vim
+---   let revlist = reverse(copy(mylist))
+--- <
+---
+--- @param object any
+--- @return any
+function vim.fn.reverse(object) end
+
+--- Round off {expr} to the nearest integral value and return it
+--- as a |Float|.  If {expr} lies halfway between two integral
+--- values, then use the larger one (away from zero).
+--- {expr} must evaluate to a |Float| or a |Number|.
+--- Returns 0.0 if {expr} is not a |Float| or a |Number|.
+--- Examples: >vim
+---   echo round(0.456)
+--- <  0.0  >vim
+---   echo round(4.5)
+--- <  5.0 >vim
+---   echo round(-4.5)
+--- <  -5.0
+---
+--- @param expr any
+--- @return any
+function vim.fn.round(expr) end
+
+--- Sends {event} to {channel} via |RPC| and returns immediately.
+--- If {channel} is 0, the event is broadcast to all channels.
+--- Example: >vim
+---   au VimLeave call rpcnotify(0, "leaving")
+--- <
+---
+--- @param channel any
+--- @param event any
+--- @param args? any
+--- @return any
+function vim.fn.rpcnotify(channel, event, args) end
+
+--- Sends a request to {channel} to invoke {method} via
+--- |RPC| and blocks until a response is received.
+--- Example: >vim
+---   let result = rpcrequest(rpc_chan, "func", 1, 2, 3)
+--- <
+---
+--- @param channel any
+--- @param method any
+--- @param args? any
+--- @return any
+function vim.fn.rpcrequest(channel, method, args) end
+
+--- Deprecated. Replace  >vim
+---   let id = rpcstart('prog', ['arg1', 'arg2'])
+--- <with >vim
+---   let id = jobstart(['prog', 'arg1', 'arg2'], {'rpc': v:true})
+--- <
+---
+--- @param prog any
+--- @param argv? any
+--- @return any
+function vim.fn.rpcstart(prog, argv) end
+
+--- @deprecated
+--- Use |jobstop()| instead to stop any job, or
+--- `chanclose(id, "rpc")` to close RPC communication
+--- without stopping the job. Use chanclose(id) to close
+--- any socket.
+---
+--- @param ... any
+--- @return any
+function vim.fn.rpcstop(...) end
+
+--- Evaluate Ruby expression {expr} and return its result
+--- converted to Vim data structures.
+--- Numbers, floats and strings are returned as they are (strings
+--- are copied though).
+--- Arrays are represented as Vim |List| type.
+--- Hashes are represented as Vim |Dictionary| type.
+--- Other objects are represented as strings resulted from their
+--- "Object#to_s" method.
+---
+--- @param expr any
+--- @return any
+function vim.fn.rubyeval(expr) end
+
+--- Like |screenchar()|, but return the attribute.  This is a rather
+--- arbitrary number that can only be used to compare to the
+--- attribute at other positions.
+--- Returns -1 when row or col is out of range.
+---
+--- @param row any
+--- @param col integer
+--- @return any
+function vim.fn.screenattr(row, col) end
+
+--- The result is a Number, which is the character at position
+--- [row, col] on the screen.  This works for every possible
+--- screen position, also status lines, window separators and the
+--- command line.  The top left position is row one, column one
+--- The character excludes composing characters.  For double-byte
+--- encodings it may only be the first byte.
+--- This is mainly to be used for testing.
+--- Returns -1 when row or col is out of range.
+---
+--- @param row any
+--- @param col integer
+--- @return any
+function vim.fn.screenchar(row, col) end
+
+--- The result is a |List| of Numbers.  The first number is the same
+--- as what |screenchar()| returns.  Further numbers are
+--- composing characters on top of the base character.
+--- This is mainly to be used for testing.
+--- Returns an empty List when row or col is out of range.
+---
+--- @param row any
+--- @param col integer
+--- @return any
+function vim.fn.screenchars(row, col) end
+
+--- The result is a Number, which is the current screen column of
+--- the cursor. The leftmost column has number 1.
+--- This function is mainly used for testing.
+---
+--- Note: Always returns the current screen column, thus if used
+--- in a command (e.g. ":echo screencol()") it will return the
+--- column inside the command line, which is 1 when the command is
+--- executed. To get the cursor position in the file use one of
+--- the following mappings: >vim
+---   nnoremap <expr> GG ":echom " .. screencol() .. "\n"
+---   nnoremap <silent> GG :echom screencol()<CR>
+---   noremap GG <Cmd>echom screencol()<Cr>
+--- <
+---
+--- @return any
+function vim.fn.screencol() end
+
+--- The result is a Dict with the screen position of the text
+--- character in window {winid} at buffer line {lnum} and column
+--- {col}.  {col} is a one-based byte index.
+--- The Dict has these members:
+---   row  screen row
+---   col  first screen column
+---   endcol  last screen column
+---   curscol  cursor screen column
+--- If the specified position is not visible, all values are zero.
+--- The "endcol" value differs from "col" when the character
+--- occupies more than one screen cell.  E.g. for a Tab "col" can
+--- be 1 and "endcol" can be 8.
+--- The "curscol" value is where the cursor would be placed.  For
+--- a Tab it would be the same as "endcol", while for a double
+--- width character it would be the same as "col".
+--- The |conceal| feature is ignored here, the column numbers are
+--- as if 'conceallevel' is zero.  You can set the cursor to the
+--- right position and use |screencol()| to get the value with
+--- |conceal| taken into account.
+--- If the position is in a closed fold the screen position of the
+--- first character is returned, {col} is not used.
+--- Returns an empty Dict if {winid} is invalid.
+---
+--- @param winid integer
+--- @param lnum integer
+--- @param col integer
+--- @return any
+function vim.fn.screenpos(winid, lnum, col) end
+
+--- The result is a Number, which is the current screen row of the
+--- cursor.  The top line has number one.
+--- This function is mainly used for testing.
+--- Alternatively you can use |winline()|.
+---
+--- Note: Same restrictions as with |screencol()|.
+---
+--- @return any
+function vim.fn.screenrow() end
+
+--- The result is a String that contains the base character and
+--- any composing characters at position [row, col] on the screen.
+--- This is like |screenchars()| but returning a String with the
+--- characters.
+--- This is mainly to be used for testing.
+--- Returns an empty String when row or col is out of range.
+---
+--- @param row any
+--- @param col integer
+--- @return any
+function vim.fn.screenstring(row, col) end
+
+--- Search for regexp pattern {pattern}.  The search starts at the
+--- cursor position (you can use |cursor()| to set it).
+---
+--- When a match has been found its line number is returned.
+--- If there is no match a 0 is returned and the cursor doesn't
+--- move.  No error message is given.
+---
+--- {flags} is a String, which can contain these character flags:
+--- 'b'  search Backward instead of forward
+--- 'c'  accept a match at the Cursor position
+--- 'e'  move to the End of the match
+--- 'n'  do Not move the cursor
+--- 'p'  return number of matching sub-Pattern (see below)
+--- 's'  Set the ' mark at the previous location of the cursor
+--- 'w'  Wrap around the end of the file
+--- 'W'  don't Wrap around the end of the file
+--- 'z'  start searching at the cursor column instead of Zero
+--- If neither 'w' or 'W' is given, the 'wrapscan' option applies.
+---
+--- If the 's' flag is supplied, the ' mark is set, only if the
+--- cursor is moved. The 's' flag cannot be combined with the 'n'
+--- flag.
+---
+--- 'ignorecase', 'smartcase' and 'magic' are used.
+---
+--- When the 'z' flag is not given, forward searching always
+--- starts in column zero and then matches before the cursor are
+--- skipped.  When the 'c' flag is present in 'cpo' the next
+--- search starts after the match.  Without the 'c' flag the next
+--- search starts one column after the start of the match.  This
+--- matters for overlapping matches.  See |cpo-c|.  You can also
+--- insert "\ze" to change where the match ends, see  |/\ze|.
+---
+--- When searching backwards and the 'z' flag is given then the
+--- search starts in column zero, thus no match in the current
+--- line will be found (unless wrapping around the end of the
+--- file).
+---
+--- When the {stopline} argument is given then the search stops
+--- after searching this line.  This is useful to restrict the
+--- search to a range of lines.  Examples: >vim
+---   let match = search('(', 'b', line("w0"))
+---   let end = search('END', '', line("w$"))
+--- <When {stopline} is used and it is not zero this also implies
+--- that the search does not wrap around the end of the file.
+--- A zero value is equal to not giving the argument.
+---
+--- When the {timeout} argument is given the search stops when
+--- more than this many milliseconds have passed.  Thus when
+--- {timeout} is 500 the search stops after half a second.
+--- The value must not be negative.  A zero value is like not
+--- giving the argument.
+---
+--- If the {skip} expression is given it is evaluated with the
+--- cursor positioned on the start of a match.  If it evaluates to
+--- non-zero this match is skipped.  This can be used, for
+--- example, to skip a match in a comment or a string.
+--- {skip} can be a string, which is evaluated as an expression, a
+--- function reference or a lambda.
+--- When {skip} is omitted or empty, every match is accepted.
+--- When evaluating {skip} causes an error the search is aborted
+--- and -1 returned.
+---           *search()-sub-match*
+--- With the 'p' flag the returned value is one more than the
+--- first sub-match in \(\).  One if none of them matched but the
+--- whole pattern did match.
+--- To get the column number too use |searchpos()|.
+---
+--- The cursor will be positioned at the match, unless the 'n'
+--- flag is used.
+---
+--- Example (goes over all files in the argument list): >vim
+---     let n = 1
+---     while n <= argc()      " loop over all files in arglist
+---       exe "argument " .. n
+---       " start at the last char in the file and wrap for the
+---       " first search to find match at start of file
+---       normal G$
+---       let flags = "w"
+---       while search("foo", flags) > 0
+---         s/foo/bar/g
+---         let flags = "W"
+---       endwhile
+---       update        " write the file if modified
+---       let n = n + 1
+---     endwhile
+--- <
+--- Example for using some flags: >vim
+---     echo search('\<if\|\(else\)\|\(endif\)', 'ncpe')
+--- <This will search for the keywords "if", "else", and "endif"
+--- under or after the cursor.  Because of the 'p' flag, it
+--- returns 1, 2, or 3 depending on which keyword is found, or 0
+--- if the search fails.  With the cursor on the first word of the
+--- line:
+---     if (foo == 0) | let foo = foo + 1 | endif ~
+--- the function returns 1.  Without the 'c' flag, the function
+--- finds the "endif" and returns 3.  The same thing happens
+--- without the 'e' flag if the cursor is on the "f" of "if".
+--- The 'n' flag tells the function not to move the cursor.
+---
+--- @param pattern any
+--- @param flags? string
+--- @param stopline? any
+--- @param timeout? integer
+--- @param skip? any
+--- @return any
+function vim.fn.search(pattern, flags, stopline, timeout, skip) end
+
+--- Get or update the last search count, like what is displayed
+--- without the "S" flag in 'shortmess'.  This works even if
+--- 'shortmess' does contain the "S" flag.
+---
+--- This returns a |Dictionary|. The dictionary is empty if the
+--- previous pattern was not set and "pattern" was not specified.
+---
+---   key    type    meaning ~
+---   current  |Number|  current position of match;
+---         0 if the cursor position is
+---         before the first match
+---   exact_match  |Boolean|  1 if "current" is matched on
+---         "pos", otherwise 0
+---   total    |Number|  total count of matches found
+---   incomplete  |Number|  0: search was fully completed
+---         1: recomputing was timed out
+---         2: max count exceeded
+---
+--- For {options} see further down.
+---
+--- To get the last search count when |n| or |N| was pressed, call
+--- this function with `recompute: 0` . This sometimes returns
+--- wrong information because |n| and |N|'s maximum count is 99.
+--- If it exceeded 99 the result must be max count + 1 (100). If
+--- you want to get correct information, specify `recompute: 1`: >vim
+---
+---   " result == maxcount + 1 (100) when many matches
+---   let result = searchcount(#{recompute: 0})
+---
+---   " Below returns correct result (recompute defaults
+---   " to 1)
+---   let result = searchcount()
+--- <
+--- The function is useful to add the count to 'statusline': >vim
+---   function! LastSearchCount() abort
+---     let result = searchcount(#{recompute: 0})
+---     if empty(result)
+---       return ''
+---     endif
+---     if result.incomplete ==# 1     " timed out
+---       return printf(' /%s [?/??]', \@/)
+---     elseif result.incomplete ==# 2 " max count exceeded
+---       if result.total > result.maxcount &&
+---       \  result.current > result.maxcount
+---         return printf(' /%s [>%d/>%d]', \@/,
+---         \             result.current, result.total)
+---       elseif result.total > result.maxcount
+---         return printf(' /%s [%d/>%d]', \@/,
+---         \             result.current, result.total)
+---       endif
+---     endif
+---     return printf(' /%s [%d/%d]', \@/,
+---     \             result.current, result.total)
+---   endfunction
+---   let &statusline ..= '%{LastSearchCount()}'
+---
+---   " Or if you want to show the count only when
+---   " 'hlsearch' was on
+---   " let &statusline ..=
+---   " \   '%{v:hlsearch ? LastSearchCount() : ""}'
+--- <
+--- You can also update the search count, which can be useful in a
+--- |CursorMoved| or |CursorMovedI| autocommand: >vim
+---
+---   autocmd CursorMoved,CursorMovedI *
+---     \ let s:searchcount_timer = timer_start(
+---     \   200, function('s:update_searchcount'))
+---   function! s:update_searchcount(timer) abort
+---     if a:timer ==# s:searchcount_timer
+---       call searchcount(#{
+---       \ recompute: 1, maxcount: 0, timeout: 100})
+---       redrawstatus
+---     endif
+---   endfunction
+--- <
+--- This can also be used to count matched texts with specified
+--- pattern in the current buffer using "pattern":  >vim
+---
+---   " Count '\<foo\>' in this buffer
+---   " (Note that it also updates search count)
+---   let result = searchcount(#{pattern: '\<foo\>'})
+---
+---   " To restore old search count by old pattern,
+---   " search again
+---   call searchcount()
+--- <
+--- {options} must be a |Dictionary|. It can contain:
+---   key    type    meaning ~
+---   recompute  |Boolean|  if |TRUE|, recompute the count
+---         like |n| or |N| was executed.
+---         otherwise returns the last
+---         computed result (when |n| or
+---         |N| was used when "S" is not
+---         in 'shortmess', or this
+---         function was called).
+---         (default: |TRUE|)
+---   pattern  |String|  recompute if this was given
+---         and different with |\@/|.
+---         this works as same as the
+---         below command is executed
+---         before calling this function >vim
+---           let \@/ = pattern
+--- <        (default: |\@/|)
+---   timeout  |Number|  0 or negative number is no
+---         timeout. timeout milliseconds
+---         for recomputing the result
+---         (default: 0)
+---   maxcount  |Number|  0 or negative number is no
+---         limit. max count of matched
+---         text while recomputing the
+---         result.  if search exceeded
+---         total count, "total" value
+---         becomes `maxcount + 1`
+---         (default: 0)
+---   pos    |List|    `[lnum, col, off]` value
+---         when recomputing the result.
+---         this changes "current" result
+---         value. see |cursor()|, |getpos()|
+---         (default: cursor's position)
+---
+--- @param options? table
+--- @return any
+function vim.fn.searchcount(options) end
+
+--- Search for the declaration of {name}.
+---
+--- With a non-zero {global} argument it works like |gD|, find
+--- first match in the file.  Otherwise it works like |gd|, find
+--- first match in the function.
+---
+--- With a non-zero {thisblock} argument matches in a {} block
+--- that ends before the cursor position are ignored.  Avoids
+--- finding variable declarations only valid in another scope.
+---
+--- Moves the cursor to the found match.
+--- Returns zero for success, non-zero for failure.
+--- Example: >vim
+---   if searchdecl('myvar') == 0
+---      echo getline('.')
+---   endif
+--- <
+---
+--- @param name string
+--- @param global? any
+--- @param thisblock? any
+--- @return any
+function vim.fn.searchdecl(name, global, thisblock) end
+
+--- Search for the match of a nested start-end pair.  This can be
+--- used to find the "endif" that matches an "if", while other
+--- if/endif pairs in between are ignored.
+--- The search starts at the cursor.  The default is to search
+--- forward, include 'b' in {flags} to search backward.
+--- If a match is found, the cursor is positioned at it and the
+--- line number is returned.  If no match is found 0 or -1 is
+--- returned and the cursor doesn't move.  No error message is
+--- given.
+---
+--- {start}, {middle} and {end} are patterns, see |pattern|.  They
+--- must not contain \( \) pairs.  Use of \%( \) is allowed.  When
+--- {middle} is not empty, it is found when searching from either
+--- direction, but only when not in a nested start-end pair.  A
+--- typical use is: >vim
+---   echo searchpair('\<if\>', '\<else\>', '\<endif\>')
+--- <By leaving {middle} empty the "else" is skipped.
+---
+--- {flags} 'b', 'c', 'n', 's', 'w' and 'W' are used like with
+--- |search()|.  Additionally:
+--- 'r'  Repeat until no more matches found; will find the
+---   outer pair.  Implies the 'W' flag.
+--- 'm'  Return number of matches instead of line number with
+---   the match; will be > 1 when 'r' is used.
+--- Note: it's nearly always a good idea to use the 'W' flag, to
+--- avoid wrapping around the end of the file.
+---
+--- When a match for {start}, {middle} or {end} is found, the
+--- {skip} expression is evaluated with the cursor positioned on
+--- the start of the match.  It should return non-zero if this
+--- match is to be skipped.  E.g., because it is inside a comment
+--- or a string.
+--- When {skip} is omitted or empty, every match is accepted.
+--- When evaluating {skip} causes an error the search is aborted
+--- and -1 returned.
+--- {skip} can be a string, a lambda, a funcref or a partial.
+--- Anything else makes the function fail.
+---
+--- For {stopline} and {timeout} see |search()|.
+---
+--- The value of 'ignorecase' is used.  'magic' is ignored, the
+--- patterns are used like it's on.
+---
+--- The search starts exactly at the cursor.  A match with
+--- {start}, {middle} or {end} at the next character, in the
+--- direction of searching, is the first one found.  Example: >vim
+---   if 1
+---     if 2
+---     endif 2
+---   endif 1
+--- <When starting at the "if 2", with the cursor on the "i", and
+--- searching forwards, the "endif 2" is found.  When starting on
+--- the character just before the "if 2", the "endif 1" will be
+--- found.  That's because the "if 2" will be found first, and
+--- then this is considered to be a nested if/endif from "if 2" to
+--- "endif 2".
+--- When searching backwards and {end} is more than one character,
+--- it may be useful to put "\zs" at the end of the pattern, so
+--- that when the cursor is inside a match with the end it finds
+--- the matching start.
+---
+--- Example, to find the "endif" command in a Vim script: >vim
+---
+---   echo searchpair('\<if\>', '\<el\%[seif]\>', '\<en\%[dif]\>', 'W',
+---   \ 'getline(".") =~ "^\\s*\""')
+---
+--- <The cursor must be at or after the "if" for which a match is
+--- to be found.  Note that single-quote strings are used to avoid
+--- having to double the backslashes.  The skip expression only
+--- catches comments at the start of a line, not after a command.
+--- Also, a word "en" or "if" halfway through a line is considered
+--- a match.
+--- Another example, to search for the matching "{" of a "}": >vim
+---
+---   echo searchpair('{', '', '}', 'bW')
+---
+--- <This works when the cursor is at or before the "}" for which a
+--- match is to be found.  To reject matches that syntax
+--- highlighting recognized as strings: >vim
+---
+---   echo searchpair('{', '', '}', 'bW',
+---        \ 'synIDattr(synID(line("."), col("."), 0), "name") =~? "string"')
+--- <
+---
+--- @return any
+function vim.fn.searchpair() end
+
+--- Same as |searchpair()|, but returns a |List| with the line and
+--- column position of the match. The first element of the |List|
+--- is the line number and the second element is the byte index of
+--- the column position of the match.  If no match is found,
+--- returns [0, 0]. >vim
+---
+---   let [lnum,col] = searchpairpos('{', '', '}', 'n')
+--- <
+--- See |match-parens| for a bigger and more useful example.
+---
+--- @return any
+function vim.fn.searchpairpos() end
+
+--- Same as |search()|, but returns a |List| with the line and
+--- column position of the match. The first element of the |List|
+--- is the line number and the second element is the byte index of
+--- the column position of the match. If no match is found,
+--- returns [0, 0].
+--- Example: >vim
+---   let [lnum, col] = searchpos('mypattern', 'n')
+---
+--- <When the 'p' flag is given then there is an extra item with
+--- the sub-pattern match number |search()-sub-match|.  Example: >vim
+---   let [lnum, col, submatch] = searchpos('\(\l\)\|\(\u\)', 'np')
+--- <In this example "submatch" is 2 when a lowercase letter is
+--- found |/\l|, 3 when an uppercase letter is found |/\u|.
+---
+--- @param pattern any
+--- @param flags? string
+--- @param stopline? any
+--- @param timeout? integer
+--- @param skip? any
+--- @return any
+function vim.fn.searchpos(pattern, flags, stopline, timeout, skip) end
+
+--- Returns a list of server addresses, or empty if all servers
+--- were stopped. |serverstart()| |serverstop()|
+--- Example: >vim
+---   echo serverlist()
+--- <
+---
+--- @return any
+function vim.fn.serverlist() end
+
+--- Opens a socket or named pipe at {address} and listens for
+--- |RPC| messages. Clients can send |API| commands to the
+--- returned address to control Nvim.
+---
+--- Returns the address string (which may differ from the
+--- {address} argument, see below).
+---
+--- - If {address} has a colon (":") it is a TCP/IPv4/IPv6 address
+---   where the last ":" separates host and port (empty or zero
+---   assigns a random port).
+--- - Else {address} is the path to a named pipe (except on Windows).
+---   - If {address} has no slashes ("/") it is treated as the
+---     "name" part of a generated path in this format: >vim
+---   stdpath("run").."/{name}.{pid}.{counter}"
+--- <  - If {address} is omitted the name is "nvim". >vim
+---   echo serverstart()
+--- < >
+---   => /tmp/nvim.bram/oknANW/nvim.15430.5
+--- <
+--- Example bash command to list all Nvim servers: >bash
+---   ls ${XDG_RUNTIME_DIR:-${TMPDIR}nvim.${USER}}/*/nvim.*.0
+---
+--- <Example named pipe: >vim
+---   if has('win32')
+---     echo serverstart('\\.\pipe\nvim-pipe-1234')
+---   else
+---     echo serverstart('nvim.sock')
+---   endif
+--- <
+--- Example TCP/IP address: >vim
+---   echo serverstart('::1:12345')
+--- <
+---
+--- @param address? any
+--- @return any
+function vim.fn.serverstart(address) end
+
+--- Closes the pipe or socket at {address}.
+--- Returns TRUE if {address} is valid, else FALSE.
+--- If |v:servername| is stopped it is set to the next available
+--- address in |serverlist()|.
+---
+--- @param address any
+--- @return any
+function vim.fn.serverstop(address) end
+
+--- Set line {lnum} to {text} in buffer {buf}.  This works like
+--- |setline()| for the specified buffer.
+---
+--- This function works only for loaded buffers. First call
+--- |bufload()| if needed.
+---
+--- To insert lines use |appendbufline()|.
+---
+--- {text} can be a string to set one line, or a List of strings
+--- to set multiple lines.  If the List extends below the last
+--- line then those lines are added.  If the List is empty then
+--- nothing is changed and zero is returned.
+---
+--- For the use of {buf}, see |bufname()| above.
+---
+--- {lnum} is used like with |setline()|.
+--- Use "$" to refer to the last line in buffer {buf}.
+--- When {lnum} is just below the last line the {text} will be
+--- added below the last line.
+--- On success 0 is returned, on failure 1 is returned.
+---
+--- If {buf} is not a valid buffer or {lnum} is not valid, an
+--- error message is given.
+---
+--- @param buf any
+--- @param lnum integer
+--- @param text any
+--- @return any
+function vim.fn.setbufline(buf, lnum, text) end
+
+--- Set option or local variable {varname} in buffer {buf} to
+--- {val}.
+--- This also works for a global or local window option, but it
+--- doesn't work for a global or local window variable.
+--- For a local window option the global value is unchanged.
+--- For the use of {buf}, see |bufname()| above.
+--- The {varname} argument is a string.
+--- Note that the variable name without "b:" must be used.
+--- Examples: >vim
+---   call setbufvar(1, "&mod", 1)
+---   call setbufvar("todo", "myvar", "foobar")
+--- <This function is not available in the |sandbox|.
+---
+--- @param buf any
+--- @param varname string
+--- @param val any
+--- @return any
+function vim.fn.setbufvar(buf, varname, val) end
+
+--- Specify overrides for cell widths of character ranges.  This
+--- tells Vim how wide characters are when displayed in the
+--- terminal, counted in screen cells.  The values override
+--- 'ambiwidth'.  Example: >vim
+---    call setcellwidths([
+---     \ [0x111, 0x111, 1],
+---     \ [0x2194, 0x2199, 2],
+---     \ ])
+---
+--- <The {list} argument is a List of Lists with each three
+--- numbers: [{low}, {high}, {width}].  *E1109* *E1110*
+--- {low} and {high} can be the same, in which case this refers to
+--- one character.  Otherwise it is the range of characters from
+--- {low} to {high} (inclusive).    *E1111* *E1114*
+--- Only characters with value 0x80 and higher can be used.
+---
+--- {width} must be either 1 or 2, indicating the character width
+--- in screen cells.      *E1112*
+--- An error is given if the argument is invalid, also when a
+--- range overlaps with another.    *E1113*
+---
+--- If the new value causes 'fillchars' or 'listchars' to become
+--- invalid it is rejected and an error is given.
+---
+--- To clear the overrides pass an empty {list}: >vim
+---    call setcellwidths([])
+---
+--- <You can use the script $VIMRUNTIME/tools/emoji_list.vim to see
+--- the effect for known emoji characters.  Move the cursor
+--- through the text to check if the cell widths of your terminal
+--- match with what Vim knows about each emoji.  If it doesn't
+--- look right you need to adjust the {list} argument.
+---
+--- @param list any
+--- @return any
+function vim.fn.setcellwidths(list) end
+
+--- Same as |setpos()| but uses the specified column number as the
+--- character index instead of the byte index in the line.
+---
+--- Example:
+--- With the text "여보세요" in line 8: >vim
+---   call setcharpos('.', [0, 8, 4, 0])
+--- <positions the cursor on the fourth character '요'. >vim
+---   call setpos('.', [0, 8, 4, 0])
+--- <positions the cursor on the second character '보'.
+---
+--- @param expr any
+--- @param list any
+--- @return any
+function vim.fn.setcharpos(expr, list) end
+
+--- Set the current character search information to {dict},
+--- which contains one or more of the following entries:
+---
+---     char  character which will be used for a subsequent
+---     |,| or |;| command; an empty string clears the
+---     character search
+---     forward  direction of character search; 1 for forward,
+---     0 for backward
+---     until  type of character search; 1 for a |t| or |T|
+---     character search, 0 for an |f| or |F|
+---     character search
+---
+--- This can be useful to save/restore a user's character search
+--- from a script: >vim
+---   let prevsearch = getcharsearch()
+---   " Perform a command which clobbers user's search
+---   call setcharsearch(prevsearch)
+--- <Also see |getcharsearch()|.
+---
+--- @param dict any
+--- @return any
+function vim.fn.setcharsearch(dict) end
+
+--- Set the command line to {str} and set the cursor position to
+--- {pos}.
+--- If {pos} is omitted, the cursor is positioned after the text.
+--- Returns 0 when successful, 1 when not editing the command
+--- line.
+---
+--- @param str any
+--- @param pos? any
+--- @return any
+function vim.fn.setcmdline(str, pos) end
+
+--- Set the cursor position in the command line to byte position
+--- {pos}.  The first position is 1.
+--- Use |getcmdpos()| to obtain the current position.
+--- Only works while editing the command line, thus you must use
+--- |c_CTRL-\_e|, |c_CTRL-R_=| or |c_CTRL-R_CTRL-R| with '='.  For
+--- |c_CTRL-\_e| and |c_CTRL-R_CTRL-R| with '=' the position is
+--- set after the command line is set to the expression.  For
+--- |c_CTRL-R_=| it is set after evaluating the expression but
+--- before inserting the resulting text.
+--- When the number is too big the cursor is put at the end of the
+--- line.  A number smaller than one has undefined results.
+--- Returns 0 when successful, 1 when not editing the command
+--- line.
+---
+--- @param pos any
+--- @return any
+function vim.fn.setcmdpos(pos) end
+
+--- @param lnum integer
+--- @param col? integer
+--- @param off? any
+--- @return any
+function vim.fn.setcursorcharpos(lnum, col, off) end
+
+--- Same as |cursor()| but uses the specified column number as the
+--- character index instead of the byte index in the line.
+---
+--- Example:
+--- With the text "여보세요" in line 4: >vim
+---   call setcursorcharpos(4, 3)
+--- <positions the cursor on the third character '세'. >vim
+---   call cursor(4, 3)
+--- <positions the cursor on the first character '여'.
+---
+--- @param list any
+--- @return any
+function vim.fn.setcursorcharpos(list) end
+
+--- Set environment variable {name} to {val}.  Example: >vim
+---   call setenv('HOME', '/home/myhome')
+---
+--- <When {val} is |v:null| the environment variable is deleted.
+--- See also |expr-env|.
+---
+--- @param name string
+--- @param val any
+--- @return any
+function vim.fn.setenv(name, val) end
+
+--- Set the file permissions for {fname} to {mode}.
+--- {mode} must be a string with 9 characters.  It is of the form
+--- "rwxrwxrwx", where each group of "rwx" flags represent, in
+--- turn, the permissions of the owner of the file, the group the
+--- file belongs to, and other users.  A '-' character means the
+--- permission is off, any other character means on.  Multi-byte
+--- characters are not supported.
+---
+--- For example "rw-r-----" means read-write for the user,
+--- readable by the group, not accessible by others.  "xx-x-----"
+--- would do the same thing.
+---
+--- Returns non-zero for success, zero for failure.
+---
+--- To read permissions see |getfperm()|.
+---
+--- @param fname string
+--- @param mode string
+--- @return any
+function vim.fn.setfperm(fname, mode) end
+
+--- Set line {lnum} of the current buffer to {text}.  To insert
+--- lines use |append()|. To set lines in another buffer use
+--- |setbufline()|.
+---
+--- {lnum} is used like with |getline()|.
+--- When {lnum} is just below the last line the {text} will be
+--- added below the last line.
+--- {text} can be any type or a List of any type, each item is
+--- converted to a String.  When {text} is an empty List then
+--- nothing is changed and FALSE is returned.
+---
+--- If this succeeds, FALSE is returned.  If this fails (most likely
+--- because {lnum} is invalid) TRUE is returned.
+---
+--- Example: >vim
+---   call setline(5, strftime("%c"))
+---
+--- <When {text} is a |List| then line {lnum} and following lines
+--- will be set to the items in the list.  Example: >vim
+---   call setline(5, ['aaa', 'bbb', 'ccc'])
+--- <This is equivalent to: >vim
+---   for [n, l] in [[5, 'aaa'], [6, 'bbb'], [7, 'ccc']]
+---     call setline(n, l)
+---   endfor
+---
+--- <Note: The '[ and '] marks are not set.
+---
+--- @param lnum integer
+--- @param text any
+--- @return any
+function vim.fn.setline(lnum, text) end
+
+--- Create or replace or add to the location list for window {nr}.
+--- {nr} can be the window number or the |window-ID|.
+--- When {nr} is zero the current window is used.
+---
+--- For a location list window, the displayed location list is
+--- modified.  For an invalid window number {nr}, -1 is returned.
+--- Otherwise, same as |setqflist()|.
+--- Also see |location-list|.
+---
+--- For {action} see |setqflist-action|.
+---
+--- If the optional {what} dictionary argument is supplied, then
+--- only the items listed in {what} are set. Refer to |setqflist()|
+--- for the list of supported keys in {what}.
+---
+--- @param nr integer
+--- @param list any
+--- @param action? any
+--- @param what? any
+--- @return any
+function vim.fn.setloclist(nr, list, action, what) end
+
+--- Restores a list of matches saved by |getmatches()| for the
+--- current window.  Returns 0 if successful, otherwise -1.  All
+--- current matches are cleared before the list is restored.  See
+--- example for |getmatches()|.
+--- If {win} is specified, use the window with this number or
+--- window ID instead of the current window.
+---
+--- @param list any
+--- @param win? any
+--- @return any
+function vim.fn.setmatches(list, win) end
+
+--- Set the position for String {expr}.  Possible values:
+---   .  the cursor
+---   'x  mark x
+---
+--- {list} must be a |List| with four or five numbers:
+---     [bufnum, lnum, col, off]
+---     [bufnum, lnum, col, off, curswant]
+---
+--- "bufnum" is the buffer number.  Zero can be used for the
+--- current buffer.  When setting an uppercase mark "bufnum" is
+--- used for the mark position.  For other marks it specifies the
+--- buffer to set the mark in.  You can use the |bufnr()| function
+--- to turn a file name into a buffer number.
+--- For setting the cursor and the ' mark "bufnum" is ignored,
+--- since these are associated with a window, not a buffer.
+--- Does not change the jumplist.
+---
+--- "lnum" and "col" are the position in the buffer.  The first
+--- column is 1.  Use a zero "lnum" to delete a mark.  If "col" is
+--- smaller than 1 then 1 is used. To use the character count
+--- instead of the byte count, use |setcharpos()|.
+---
+--- The "off" number is only used when 'virtualedit' is set. Then
+--- it is the offset in screen columns from the start of the
+--- character.  E.g., a position within a <Tab> or after the last
+--- character.
+---
+--- The "curswant" number is only used when setting the cursor
+--- position.  It sets the preferred column for when moving the
+--- cursor vertically.  When the "curswant" number is missing the
+--- preferred column is not set.  When it is present and setting a
+--- mark position it is not used.
+---
+--- Note that for '< and '> changing the line number may result in
+--- the marks to be effectively be swapped, so that '< is always
+--- before '>.
+---
+--- Returns 0 when the position could be set, -1 otherwise.
+--- An error message is given if {expr} is invalid.
+---
+--- Also see |setcharpos()|, |getpos()| and |getcurpos()|.
+---
+--- This does not restore the preferred column for moving
+--- vertically; if you set the cursor position with this, |j| and
+--- |k| motions will jump to previous columns!  Use |cursor()| to
+--- also set the preferred column.  Also see the "curswant" key in
+--- |winrestview()|.
+---
+--- @param expr any
+--- @param list any
+--- @return any
+function vim.fn.setpos(expr, list) end
+
+--- Create or replace or add to the quickfix list.
+---
+--- If the optional {what} dictionary argument is supplied, then
+--- only the items listed in {what} are set. The first {list}
+--- argument is ignored.  See below for the supported items in
+--- {what}.
+---           *setqflist-what*
+--- When {what} is not present, the items in {list} are used.  Each
+--- item must be a dictionary.  Non-dictionary items in {list} are
+--- ignored.  Each dictionary item can contain the following
+--- entries:
+---
+---     bufnr  buffer number; must be the number of a valid
+---     buffer
+---     filename  name of a file; only used when "bufnr" is not
+---     present or it is invalid.
+---     module  name of a module; if given it will be used in
+---     quickfix error window instead of the filename.
+---     lnum  line number in the file
+---     end_lnum  end of lines, if the item spans multiple lines
+---     pattern  search pattern used to locate the error
+---     col    column number
+---     vcol  when non-zero: "col" is visual column
+---     when zero: "col" is byte index
+---     end_col  end column, if the item spans multiple columns
+---     nr    error number
+---     text  description of the error
+---     type  single-character error type, 'E', 'W', etc.
+---     valid  recognized error message
+---     user_data
+---     custom data associated with the item, can be
+---     any type.
+---
+--- The "col", "vcol", "nr", "type" and "text" entries are
+--- optional.  Either "lnum" or "pattern" entry can be used to
+--- locate a matching error line.
+--- If the "filename" and "bufnr" entries are not present or
+--- neither the "lnum" or "pattern" entries are present, then the
+--- item will not be handled as an error line.
+--- If both "pattern" and "lnum" are present then "pattern" will
+--- be used.
+--- If the "valid" entry is not supplied, then the valid flag is
+--- set when "bufnr" is a valid buffer or "filename" exists.
+--- If you supply an empty {list}, the quickfix list will be
+--- cleared.
+--- Note that the list is not exactly the same as what
+--- |getqflist()| returns.
+---
+--- {action} values:    *setqflist-action* *E927*
+--- 'a'  The items from {list} are added to the existing
+---   quickfix list. If there is no existing list, then a
+---   new list is created.
+---
+--- 'r'  The items from the current quickfix list are replaced
+---   with the items from {list}.  This can also be used to
+---   clear the list: >vim
+---     call setqflist([], 'r')
+--- <
+--- 'f'  All the quickfix lists in the quickfix stack are
+---   freed.
+---
+--- If {action} is not present or is set to ' ', then a new list
+--- is created. The new quickfix list is added after the current
+--- quickfix list in the stack and all the following lists are
+--- freed. To add a new quickfix list at the end of the stack,
+--- set "nr" in {what} to "$".
+---
+--- The following items can be specified in dictionary {what}:
+---     context  quickfix list context. See |quickfix-context|
+---     efm    errorformat to use when parsing text from
+---     "lines". If this is not present, then the
+---     'errorformat' option value is used.
+---     See |quickfix-parse|
+---     id    quickfix list identifier |quickfix-ID|
+---     idx    index of the current entry in the quickfix
+---     list specified by "id" or "nr". If set to '$',
+---     then the last entry in the list is set as the
+---     current entry.  See |quickfix-index|
+---     items  list of quickfix entries. Same as the {list}
+---     argument.
+---     lines  use 'errorformat' to parse a list of lines and
+---     add the resulting entries to the quickfix list
+---     {nr} or {id}.  Only a |List| value is supported.
+---     See |quickfix-parse|
+---     nr    list number in the quickfix stack; zero
+---     means the current quickfix list and "$" means
+---     the last quickfix list.
+---     quickfixtextfunc
+---     function to get the text to display in the
+---     quickfix window.  The value can be the name of
+---     a function or a funcref or a lambda.  Refer to
+---     |quickfix-window-function| for an explanation
+---     of how to write the function and an example.
+---     title  quickfix list title text. See |quickfix-title|
+--- Unsupported keys in {what} are ignored.
+--- If the "nr" item is not present, then the current quickfix list
+--- is modified. When creating a new quickfix list, "nr" can be
+--- set to a value one greater than the quickfix stack size.
+--- When modifying a quickfix list, to guarantee that the correct
+--- list is modified, "id" should be used instead of "nr" to
+--- specify the list.
+---
+--- Examples (See also |setqflist-examples|): >vim
+---    call setqflist([], 'r', {'title': 'My search'})
+---    call setqflist([], 'r', {'nr': 2, 'title': 'Errors'})
+---    call setqflist([], 'a', {'id':qfid, 'lines':["F1:10:L10"]})
+--- <
+--- Returns zero for success, -1 for failure.
+---
+--- This function can be used to create a quickfix list
+--- independent of the 'errorformat' setting.  Use a command like
+--- `:cc 1` to jump to the first position.
+---
+--- @param list any
+--- @param action? any
+--- @param what? any
+--- @return any
+function vim.fn.setqflist(list, action, what) end
+
+--- Set the register {regname} to {value}.
+--- If {regname} is "" or "\@", the unnamed register '"' is used.
+--- The {regname} argument is a string.
+---
+--- {value} may be any value returned by |getreg()| or
+--- |getreginfo()|, including a |List| or |Dict|.
+--- If {options} contains "a" or {regname} is upper case,
+--- then the value is appended.
+---
+--- {options} can also contain a register type specification:
+---     "c" or "v"        |charwise| mode
+---     "l" or "V"        |linewise| mode
+---     "b" or "<CTRL-V>" |blockwise-visual| mode
+--- If a number immediately follows "b" or "<CTRL-V>" then this is
+--- used as the width of the selection - if it is not specified
+--- then the width of the block is set to the number of characters
+--- in the longest line (counting a <Tab> as 1 character).
+--- If {options} contains "u" or '"', then the unnamed register is
+--- set to point to register {regname}.
+---
+--- If {options} contains no register settings, then the default
+--- is to use character mode unless {value} ends in a <NL> for
+--- string {value} and linewise mode for list {value}. Blockwise
+--- mode is never selected automatically.
+--- Returns zero for success, non-zero for failure.
+---
+---           *E883*
+--- Note: you may not use |List| containing more than one item to
+---       set search and expression registers. Lists containing no
+---       items act like empty strings.
+---
+--- Examples: >vim
+---   call setreg(v:register, \@*)
+---   call setreg('*', \@%, 'ac')
+---   call setreg('a', "1\n2\n3", 'b5')
+---   call setreg('"', { 'points_to': 'a'})
+---
+--- <This example shows using the functions to save and restore a
+--- register: >vim
+---   let var_a = getreginfo()
+---   call setreg('a', var_a)
+--- <or: >vim
+---   let var_a = getreg('a', 1, 1)
+---   let var_amode = getregtype('a')
+---   " ....
+---   call setreg('a', var_a, var_amode)
+--- <Note: you may not reliably restore register value
+--- without using the third argument to |getreg()| as without it
+--- newlines are represented as newlines AND Nul bytes are
+--- represented as newlines as well, see |NL-used-for-Nul|.
+---
+--- You can also change the type of a register by appending
+--- nothing: >vim
+---   call setreg('a', '', 'al')
+---
+--- @param regname string
+--- @param value any
+--- @param options? table
+--- @return any
+function vim.fn.setreg(regname, value, options) end
+
+--- Set tab-local variable {varname} to {val} in tab page {tabnr}.
+--- |t:var|
+--- The {varname} argument is a string.
+--- Note that the variable name without "t:" must be used.
+--- Tabs are numbered starting with one.
+--- This function is not available in the |sandbox|.
+---
+--- @param tabnr integer
+--- @param varname string
+--- @param val any
+--- @return any
+function vim.fn.settabvar(tabnr, varname, val) end
+
+--- Set option or local variable {varname} in window {winnr} to
+--- {val}.
+--- Tabs are numbered starting with one.  For the current tabpage
+--- use |setwinvar()|.
+--- {winnr} can be the window number or the |window-ID|.
+--- When {winnr} is zero the current window is used.
+--- This also works for a global or local buffer option, but it
+--- doesn't work for a global or local buffer variable.
+--- For a local buffer option the global value is unchanged.
+--- Note that the variable name without "w:" must be used.
+--- Examples: >vim
+---   call settabwinvar(1, 1, "&list", 0)
+---   call settabwinvar(3, 2, "myvar", "foobar")
+--- <This function is not available in the |sandbox|.
+---
+--- @param tabnr integer
+--- @param winnr integer
+--- @param varname string
+--- @param val any
+--- @return any
+function vim.fn.settabwinvar(tabnr, winnr, varname, val) end
+
+--- Modify the tag stack of the window {nr} using {dict}.
+--- {nr} can be the window number or the |window-ID|.
+---
+--- For a list of supported items in {dict}, refer to
+--- |gettagstack()|. "curidx" takes effect before changing the tag
+--- stack.
+---           *E962*
+--- How the tag stack is modified depends on the {action}
+--- argument:
+--- - If {action} is not present or is set to 'r', then the tag
+---   stack is replaced.
+--- - If {action} is set to 'a', then new entries from {dict} are
+---   pushed (added) onto the tag stack.
+--- - If {action} is set to 't', then all the entries from the
+---   current entry in the tag stack or "curidx" in {dict} are
+---   removed and then new entries are pushed to the stack.
+---
+--- The current index is set to one after the length of the tag
+--- stack after the modification.
+---
+--- Returns zero for success, -1 for failure.
+---
+--- Examples (for more examples see |tagstack-examples|):
+---     Empty the tag stack of window 3: >vim
+---   call settagstack(3, {'items' : []})
+---
+--- <    Save and restore the tag stack: >vim
+---   let stack = gettagstack(1003)
+---   " do something else
+---   call settagstack(1003, stack)
+---   unlet stack
+--- <
+---
+--- @param nr integer
+--- @param dict any
+--- @param action? any
+--- @return any
+function vim.fn.settagstack(nr, dict, action) end
+
+--- Like |settabwinvar()| for the current tab page.
+--- Examples: >vim
+---   call setwinvar(1, "&list", 0)
+---   call setwinvar(2, "myvar", "foobar")
+---
+--- @param nr integer
+--- @param varname string
+--- @param val any
+--- @return any
+function vim.fn.setwinvar(nr, varname, val) end
+
+--- Returns a String with 64 hex characters, which is the SHA256
+--- checksum of {string}.
+---
+--- @param string string
+--- @return any
+function vim.fn.sha256(string) end
+
+--- Escape {string} for use as a shell command argument.
+---
+--- On Windows when 'shellslash' is not set, encloses {string} in
+--- double-quotes and doubles all double-quotes within {string}.
+--- Otherwise encloses {string} in single-quotes and replaces all
+--- "'" with "'\''".
+---
+--- If {special} is a |non-zero-arg|:
+--- - Special items such as "!", "%", "#" and "<cword>" will be
+---   preceded by a backslash. The backslash will be removed again
+---   by the |:!| command.
+--- - The <NL> character is escaped.
+---
+--- If 'shell' contains "csh" in the tail:
+--- - The "!" character will be escaped. This is because csh and
+---   tcsh use "!" for history replacement even in single-quotes.
+--- - The <NL> character is escaped (twice if {special} is
+---   a |non-zero-arg|).
+---
+--- If 'shell' contains "fish" in the tail, the "\" character will
+--- be escaped because in fish it is used as an escape character
+--- inside single quotes.
+---
+--- Example of use with a |:!| command: >vim
+---     exe '!dir ' .. shellescape(expand('<cfile>'), 1)
+--- <This results in a directory listing for the file under the
+--- cursor.  Example of use with |system()|: >vim
+---     call system("chmod +w -- " .. shellescape(expand("%")))
+--- <See also |::S|.
+---
+--- @param string string
+--- @param special? any
+--- @return any
+function vim.fn.shellescape(string, special) end
+
+--- Returns the effective value of 'shiftwidth'. This is the
+--- 'shiftwidth' value unless it is zero, in which case it is the
+--- 'tabstop' value.  To be backwards compatible in indent
+--- plugins, use this: >vim
+---   if exists('*shiftwidth')
+---     func s:sw()
+---       return shiftwidth()
+---     endfunc
+---   else
+---     func s:sw()
+---       return &sw
+---     endfunc
+---   endif
+--- <And then use s:sw() instead of &sw.
+---
+--- When there is one argument {col} this is used as column number
+--- for which to return the 'shiftwidth' value. This matters for the
+--- 'vartabstop' feature. If no {col} argument is given, column 1
+--- will be assumed.
+---
+--- @param col? integer
+--- @return integer
+function vim.fn.shiftwidth(col) end
+
+--- @param name string
+--- @param dict? vim.fn.sign_define.dict
+--- @return 0|-1
+function vim.fn.sign_define(name, dict) end
+
+--- Define a new sign named {name} or modify the attributes of an
+--- existing sign.  This is similar to the |:sign-define| command.
+---
+--- Prefix {name} with a unique text to avoid name collisions.
+--- There is no {group} like with placing signs.
+---
+--- The {name} can be a String or a Number.  The optional {dict}
+--- argument specifies the sign attributes.  The following values
+--- are supported:
+---    icon    full path to the bitmap file for the sign.
+---    linehl  highlight group used for the whole line the
+---     sign is placed in.
+---    numhl  highlight group used for the line number where
+---     the sign is placed.
+---    text    text that is displayed when there is no icon
+---     or the GUI is not being used.
+---    texthl  highlight group used for the text item
+---    culhl  highlight group used for the text item when
+---     the cursor is on the same line as the sign and
+---     'cursorline' is enabled.
+---
+--- If the sign named {name} already exists, then the attributes
+--- of the sign are updated.
+---
+--- The one argument {list} can be used to define a list of signs.
+--- Each list item is a dictionary with the above items in {dict}
+--- and a "name" item for the sign name.
+---
+--- Returns 0 on success and -1 on failure.  When the one argument
+--- {list} is used, then returns a List of values one for each
+--- defined sign.
+---
+--- Examples: >vim
+---   call sign_define("mySign", {
+---     \ "text" : "=>",
+---     \ "texthl" : "Error",
+---     \ "linehl" : "Search"})
+---   call sign_define([
+---     \ {'name' : 'sign1',
+---     \  'text' : '=>'},
+---     \ {'name' : 'sign2',
+---     \  'text' : '!!'}
+---     \ ])
+--- <
+---
+--- @param list vim.fn.sign_define.dict[]
+--- @return (0|-1)[]
+function vim.fn.sign_define(list) end
+
+--- Get a list of defined signs and their attributes.
+--- This is similar to the |:sign-list| command.
+---
+--- If the {name} is not supplied, then a list of all the defined
+--- signs is returned. Otherwise the attribute of the specified
+--- sign is returned.
+---
+--- Each list item in the returned value is a dictionary with the
+--- following entries:
+---    icon    full path to the bitmap file of the sign
+---    linehl  highlight group used for the whole line the
+---     sign is placed in; not present if not set.
+---    name    name of the sign
+---    numhl  highlight group used for the line number where
+---     the sign is placed; not present if not set.
+---    text    text that is displayed when there is no icon
+---     or the GUI is not being used.
+---    texthl  highlight group used for the text item; not
+---     present if not set.
+---    culhl  highlight group used for the text item when
+---     the cursor is on the same line as the sign and
+---     'cursorline' is enabled; not present if not
+---     set.
+---
+--- Returns an empty List if there are no signs and when {name} is
+--- not found.
+---
+--- Examples: >vim
+---   " Get a list of all the defined signs
+---   echo sign_getdefined()
+---
+---   " Get the attribute of the sign named mySign
+---   echo sign_getdefined("mySign")
+--- <
+---
+--- @param name? string
+--- @return vim.fn.sign_getdefined.ret.item[]
+function vim.fn.sign_getdefined(name) end
+
+--- Return a list of signs placed in a buffer or all the buffers.
+--- This is similar to the |:sign-place-list| command.
+---
+--- If the optional buffer name {buf} is specified, then only the
+--- list of signs placed in that buffer is returned.  For the use
+--- of {buf}, see |bufname()|. The optional {dict} can contain
+--- the following entries:
+---    group  select only signs in this group
+---    id    select sign with this identifier
+---    lnum    select signs placed in this line. For the use
+---     of {lnum}, see |line()|.
+--- If {group} is "*", then signs in all the groups including the
+--- global group are returned. If {group} is not supplied or is an
+--- empty string, then only signs in the global group are
+--- returned.  If no arguments are supplied, then signs in the
+--- global group placed in all the buffers are returned.
+--- See |sign-group|.
+---
+--- Each list item in the returned value is a dictionary with the
+--- following entries:
+---   bufnr  number of the buffer with the sign
+---   signs  list of signs placed in {bufnr}. Each list
+---     item is a dictionary with the below listed
+---     entries
+---
+--- The dictionary for each sign contains the following entries:
+---   group   sign group. Set to '' for the global group.
+---   id   identifier of the sign
+---   lnum   line number where the sign is placed
+---   name   name of the defined sign
+---   priority sign priority
+---
+--- The returned signs in a buffer are ordered by their line
+--- number and priority.
+---
+--- Returns an empty list on failure or if there are no placed
+--- signs.
+---
+--- Examples: >vim
+---   " Get a List of signs placed in eval.c in the
+---   " global group
+---   echo sign_getplaced("eval.c")
+---
+---   " Get a List of signs in group 'g1' placed in eval.c
+---   echo sign_getplaced("eval.c", {'group' : 'g1'})
+---
+---   " Get a List of signs placed at line 10 in eval.c
+---   echo sign_getplaced("eval.c", {'lnum' : 10})
+---
+---   " Get sign with identifier 10 placed in a.py
+---   echo sign_getplaced("a.py", {'id' : 10})
+---
+---   " Get sign with id 20 in group 'g1' placed in a.py
+---   echo sign_getplaced("a.py", {'group' : 'g1',
+---           \  'id' : 20})
+---
+---   " Get a List of all the placed signs
+---   echo sign_getplaced()
+--- <
+---
+--- @param buf? any
+--- @param dict? vim.fn.sign_getplaced.dict
+--- @return vim.fn.sign_getplaced.ret.item[]
+function vim.fn.sign_getplaced(buf, dict) end
+
+--- Open the buffer {buf} or jump to the window that contains
+--- {buf} and position the cursor at sign {id} in group {group}.
+--- This is similar to the |:sign-jump| command.
+---
+--- If {group} is an empty string, then the global group is used.
+--- For the use of {buf}, see |bufname()|.
+---
+--- Returns the line number of the sign. Returns -1 if the
+--- arguments are invalid.
+---
+--- Example: >vim
+---   " Jump to sign 10 in the current buffer
+---   call sign_jump(10, '', '')
+--- <
+---
+--- @param id integer
+--- @param group string
+--- @param buf integer|string
+--- @return integer
+function vim.fn.sign_jump(id, group, buf) end
+
+--- Place the sign defined as {name} at line {lnum} in file or
+--- buffer {buf} and assign {id} and {group} to sign.  This is
+--- similar to the |:sign-place| command.
+---
+--- If the sign identifier {id} is zero, then a new identifier is
+--- allocated.  Otherwise the specified number is used. {group} is
+--- the sign group name. To use the global sign group, use an
+--- empty string.  {group} functions as a namespace for {id}, thus
+--- two groups can use the same IDs. Refer to |sign-identifier|
+--- and |sign-group| for more information.
+---
+--- {name} refers to a defined sign.
+--- {buf} refers to a buffer name or number. For the accepted
+--- values, see |bufname()|.
+---
+--- The optional {dict} argument supports the following entries:
+---   lnum    line number in the file or buffer
+---       {buf} where the sign is to be placed.
+---       For the accepted values, see |line()|.
+---   priority  priority of the sign. See
+---       |sign-priority| for more information.
+---
+--- If the optional {dict} is not specified, then it modifies the
+--- placed sign {id} in group {group} to use the defined sign
+--- {name}.
+---
+--- Returns the sign identifier on success and -1 on failure.
+---
+--- Examples: >vim
+---   " Place a sign named sign1 with id 5 at line 20 in
+---   " buffer json.c
+---   call sign_place(5, '', 'sign1', 'json.c',
+---           \ {'lnum' : 20})
+---
+---   " Updates sign 5 in buffer json.c to use sign2
+---   call sign_place(5, '', 'sign2', 'json.c')
+---
+---   " Place a sign named sign3 at line 30 in
+---   " buffer json.c with a new identifier
+---   let id = sign_place(0, '', 'sign3', 'json.c',
+---           \ {'lnum' : 30})
+---
+---   " Place a sign named sign4 with id 10 in group 'g3'
+---   " at line 40 in buffer json.c with priority 90
+---   call sign_place(10, 'g3', 'sign4', 'json.c',
+---       \ {'lnum' : 40, 'priority' : 90})
+--- <
+---
+--- @param id any
+--- @param group any
+--- @param name string
+--- @param buf any
+--- @param dict? vim.fn.sign_place.dict
+--- @return integer
+function vim.fn.sign_place(id, group, name, buf, dict) end
+
+--- Place one or more signs.  This is similar to the
+--- |sign_place()| function.  The {list} argument specifies the
+--- List of signs to place. Each list item is a dict with the
+--- following sign attributes:
+---     buffer  Buffer name or number. For the accepted
+---     values, see |bufname()|.
+---     group  Sign group. {group} functions as a namespace
+---     for {id}, thus two groups can use the same
+---     IDs. If not specified or set to an empty
+---     string, then the global group is used.   See
+---     |sign-group| for more information.
+---     id    Sign identifier. If not specified or zero,
+---     then a new unique identifier is allocated.
+---     Otherwise the specified number is used. See
+---     |sign-identifier| for more information.
+---     lnum  Line number in the buffer where the sign is to
+---     be placed. For the accepted values, see
+---     |line()|.
+---     name  Name of the sign to place. See |sign_define()|
+---     for more information.
+---     priority  Priority of the sign. When multiple signs are
+---     placed on a line, the sign with the highest
+---     priority is used. If not specified, the
+---     default value of 10 is used. See
+---     |sign-priority| for more information.
+---
+--- If {id} refers to an existing sign, then the existing sign is
+--- modified to use the specified {name} and/or {priority}.
+---
+--- Returns a List of sign identifiers. If failed to place a
+--- sign, the corresponding list item is set to -1.
+---
+--- Examples: >vim
+---   " Place sign s1 with id 5 at line 20 and id 10 at line
+---   " 30 in buffer a.c
+---   let [n1, n2] = sign_placelist([
+---     \ {'id' : 5,
+---     \  'name' : 's1',
+---     \  'buffer' : 'a.c',
+---     \  'lnum' : 20},
+---     \ {'id' : 10,
+---     \  'name' : 's1',
+---     \  'buffer' : 'a.c',
+---     \  'lnum' : 30}
+---     \ ])
+---
+---   " Place sign s1 in buffer a.c at line 40 and 50
+---   " with auto-generated identifiers
+---   let [n1, n2] = sign_placelist([
+---     \ {'name' : 's1',
+---     \  'buffer' : 'a.c',
+---     \  'lnum' : 40},
+---     \ {'name' : 's1',
+---     \  'buffer' : 'a.c',
+---     \  'lnum' : 50}
+---     \ ])
+--- <
+---
+--- @param list vim.fn.sign_placelist.list.item[]
+--- @return integer[]
+function vim.fn.sign_placelist(list) end
+
+--- @param name? string
+--- @return 0|-1
+function vim.fn.sign_undefine(name) end
+
+--- Deletes a previously defined sign {name}. This is similar to
+--- the |:sign-undefine| command. If {name} is not supplied, then
+--- deletes all the defined signs.
+---
+--- The one argument {list} can be used to undefine a list of
+--- signs. Each list item is the name of a sign.
+---
+--- Returns 0 on success and -1 on failure.  For the one argument
+--- {list} call, returns a list of values one for each undefined
+--- sign.
+---
+--- Examples: >vim
+---   " Delete a sign named mySign
+---   call sign_undefine("mySign")
+---
+---   " Delete signs 'sign1' and 'sign2'
+---   call sign_undefine(["sign1", "sign2"])
+---
+---   " Delete all the signs
+---   call sign_undefine()
+--- <
+---
+--- @param list? string[]
+--- @return integer[]
+function vim.fn.sign_undefine(list) end
+
+--- Remove a previously placed sign in one or more buffers.  This
+--- is similar to the |:sign-unplace| command.
+---
+--- {group} is the sign group name. To use the global sign group,
+--- use an empty string.  If {group} is set to "*", then all the
+--- groups including the global group are used.
+--- The signs in {group} are selected based on the entries in
+--- {dict}.  The following optional entries in {dict} are
+--- supported:
+---   buffer  buffer name or number. See |bufname()|.
+---   id  sign identifier
+--- If {dict} is not supplied, then all the signs in {group} are
+--- removed.
+---
+--- Returns 0 on success and -1 on failure.
+---
+--- Examples: >vim
+---   " Remove sign 10 from buffer a.vim
+---   call sign_unplace('', {'buffer' : "a.vim", 'id' : 10})
+---
+---   " Remove sign 20 in group 'g1' from buffer 3
+---   call sign_unplace('g1', {'buffer' : 3, 'id' : 20})
+---
+---   " Remove all the signs in group 'g2' from buffer 10
+---   call sign_unplace('g2', {'buffer' : 10})
+---
+---   " Remove sign 30 in group 'g3' from all the buffers
+---   call sign_unplace('g3', {'id' : 30})
+---
+---   " Remove all the signs placed in buffer 5
+---   call sign_unplace('*', {'buffer' : 5})
+---
+---   " Remove the signs in group 'g4' from all the buffers
+---   call sign_unplace('g4')
+---
+---   " Remove sign 40 from all the buffers
+---   call sign_unplace('*', {'id' : 40})
+---
+---   " Remove all the placed signs from all the buffers
+---   call sign_unplace('*')
+---
+--- @param group string
+--- @param dict? vim.fn.sign_unplace.dict
+--- @return 0|-1
+function vim.fn.sign_unplace(group, dict) end
+
+--- Remove previously placed signs from one or more buffers.  This
+--- is similar to the |sign_unplace()| function.
+---
+--- The {list} argument specifies the List of signs to remove.
+--- Each list item is a dict with the following sign attributes:
+---     buffer  buffer name or number. For the accepted
+---     values, see |bufname()|. If not specified,
+---     then the specified sign is removed from all
+---     the buffers.
+---     group  sign group name. If not specified or set to an
+---     empty string, then the global sign group is
+---     used. If set to "*", then all the groups
+---     including the global group are used.
+---     id    sign identifier. If not specified, then all
+---     the signs in the specified group are removed.
+---
+--- Returns a List where an entry is set to 0 if the corresponding
+--- sign was successfully removed or -1 on failure.
+---
+--- Example: >vim
+---   " Remove sign with id 10 from buffer a.vim and sign
+---   " with id 20 from buffer b.vim
+---   call sign_unplacelist([
+---     \ {'id' : 10, 'buffer' : "a.vim"},
+---     \ {'id' : 20, 'buffer' : 'b.vim'},
+---     \ ])
+--- <
+---
+--- @param list vim.fn.sign_unplacelist.list.item
+--- @return (0|-1)[]
+function vim.fn.sign_unplacelist(list) end
+
+--- Simplify the file name as much as possible without changing
+--- the meaning.  Shortcuts (on MS-Windows) or symbolic links (on
+--- Unix) are not resolved.  If the first path component in
+--- {filename} designates the current directory, this will be
+--- valid for the result as well.  A trailing path separator is
+--- not removed either. On Unix "//path" is unchanged, but
+--- "///path" is simplified to "/path" (this follows the Posix
+--- standard).
+--- Example: >vim
+---   simplify("./dir/.././/file/") == "./file/"
+--- <Note: The combination "dir/.." is only removed if "dir" is
+--- a searchable directory or does not exist.  On Unix, it is also
+--- removed when "dir" is a symbolic link within the same
+--- directory.  In order to resolve all the involved symbolic
+--- links before simplifying the path name, use |resolve()|.
+---
+--- @param filename any
+--- @return any
+function vim.fn.simplify(filename) end
+
+--- Return the sine of {expr}, measured in radians, as a |Float|.
+--- {expr} must evaluate to a |Float| or a |Number|.
+--- Returns 0.0 if {expr} is not a |Float| or a |Number|.
+--- Examples: >vim
+---   echo sin(100)
+--- <  -0.506366 >vim
+---   echo sin(-4.01)
+--- <  0.763301
+---
+--- @param expr any
+--- @return any
+function vim.fn.sin(expr) end
+
+--- Return the hyperbolic sine of {expr} as a |Float| in the range
+--- [-inf, inf].
+--- {expr} must evaluate to a |Float| or a |Number|.
+--- Returns 0.0 if {expr} is not a |Float| or a |Number|.
+--- Examples: >vim
+---   echo sinh(0.5)
+--- <  0.521095 >vim
+---   echo sinh(-0.9)
+--- <  -1.026517
+---
+--- @param expr any
+--- @return any
+function vim.fn.sinh(expr) end
+
+--- Similar to using a |slice| "expr[start : end]", but "end" is
+--- used exclusive.  And for a string the indexes are used as
+--- character indexes instead of byte indexes.
+--- Also, composing characters are not counted.
+--- When {end} is omitted the slice continues to the last item.
+--- When {end} is -1 the last item is omitted.
+--- Returns an empty value if {start} or {end} are invalid.
+---
+--- @param expr any
+--- @param start any
+--- @param end_? any
+--- @return any
+function vim.fn.slice(expr, start, end_) end
+
+--- Connect a socket to an address. If {mode} is "pipe" then
+--- {address} should be the path of a local domain socket (on
+--- unix) or named pipe (on Windows). If {mode} is "tcp" then
+--- {address} should be of the form "host:port" where the host
+--- should be an ip address or host name, and port the port
+--- number.
+---
+--- For "pipe" mode, see |luv-pipe-handle|. For "tcp" mode, see
+--- |luv-tcp-handle|.
+---
+--- Returns a |channel| ID. Close the socket with |chanclose()|.
+--- Use |chansend()| to send data over a bytes socket, and
+--- |rpcrequest()| and |rpcnotify()| to communicate with a RPC
+--- socket.
+---
+--- {opts} is an optional dictionary with these keys:
+---   |on_data| : callback invoked when data was read from socket
+---   data_buffered : read socket data in |channel-buffered| mode.
+---   rpc     : If set, |msgpack-rpc| will be used to communicate
+---       over the socket.
+--- Returns:
+---   - The channel ID on success (greater than zero)
+---   - 0 on invalid arguments or connection failure.
+---
+--- @param mode string
+--- @param address any
+--- @param opts? table
+--- @return any
+function vim.fn.sockconnect(mode, address, opts) end
+
+--- Sort the items in {list} in-place.  Returns {list}.
+---
+--- If you want a list to remain unmodified make a copy first: >vim
+---   let sortedlist = sort(copy(mylist))
+---
+--- <When {how} is omitted or is a string, then sort() uses the
+--- string representation of each item to sort on.  Numbers sort
+--- after Strings, |Lists| after Numbers.  For sorting text in the
+--- current buffer use |:sort|.
+---
+--- When {how} is given and it is 'i' then case is ignored.
+--- For backwards compatibility, the value one can be used to
+--- ignore case.  Zero means to not ignore case.
+---
+--- When {how} is given and it is 'l' then the current collation
+--- locale is used for ordering. Implementation details: strcoll()
+--- is used to compare strings. See |:language| check or set the
+--- collation locale. |v:collate| can also be used to check the
+--- current locale. Sorting using the locale typically ignores
+--- case. Example: >vim
+---   " ö is sorted similarly to o with English locale.
+---   language collate en_US.UTF8
+---   echo sort(['n', 'o', 'O', 'ö', 'p', 'z'], 'l')
+--- <  ['n', 'o', 'O', 'ö', 'p', 'z'] ~
+--- >vim
+---   " ö is sorted after z with Swedish locale.
+---   language collate sv_SE.UTF8
+---   echo sort(['n', 'o', 'O', 'ö', 'p', 'z'], 'l')
+--- <  ['n', 'o', 'O', 'p', 'z', 'ö'] ~
+--- This does not work properly on Mac.
+---
+--- When {how} is given and it is 'n' then all items will be
+--- sorted numerical (Implementation detail: this uses the
+--- strtod() function to parse numbers, Strings, Lists, Dicts and
+--- Funcrefs will be considered as being 0).
+---
+--- When {how} is given and it is 'N' then all items will be
+--- sorted numerical. This is like 'n' but a string containing
+--- digits will be used as the number they represent.
+---
+--- When {how} is given and it is 'f' then all items will be
+--- sorted numerical. All values must be a Number or a Float.
+---
+--- When {how} is a |Funcref| or a function name, this function
+--- is called to compare items.  The function is invoked with two
+--- items as argument and must return zero if they are equal, 1 or
+--- bigger if the first one sorts after the second one, -1 or
+--- smaller if the first one sorts before the second one.
+---
+--- {dict} is for functions with the "dict" attribute.  It will be
+--- used to set the local variable "self". |Dictionary-function|
+---
+--- The sort is stable, items which compare equal (as number or as
+--- string) will keep their relative position. E.g., when sorting
+--- on numbers, text strings will sort next to each other, in the
+--- same order as they were originally.
+---
+---
+--- Example: >vim
+---   func MyCompare(i1, i2)
+---      return a:i1 == a:i2 ? 0 : a:i1 > a:i2 ? 1 : -1
+---   endfunc
+---   eval mylist->sort("MyCompare")
+--- <A shorter compare version for this specific simple case, which
+--- ignores overflow: >vim
+---   func MyCompare(i1, i2)
+---      return a:i1 - a:i2
+---   endfunc
+--- <For a simple expression you can use a lambda: >vim
+---   eval mylist->sort({i1, i2 -> i1 - i2})
+--- <
+---
+--- @param list any
+--- @param how? any
+--- @param dict? any
+--- @return any
+function vim.fn.sort(list, how, dict) end
+
+--- Return the sound-folded equivalent of {word}.  Uses the first
+--- language in 'spelllang' for the current window that supports
+--- soundfolding.  'spell' must be set.  When no sound folding is
+--- possible the {word} is returned unmodified.
+--- This can be used for making spelling suggestions.  Note that
+--- the method can be quite slow.
+---
+--- @param word any
+--- @return any
+function vim.fn.soundfold(word) end
+
+--- Without argument: The result is the badly spelled word under
+--- or after the cursor.  The cursor is moved to the start of the
+--- bad word.  When no bad word is found in the cursor line the
+--- result is an empty string and the cursor doesn't move.
+---
+--- With argument: The result is the first word in {sentence} that
+--- is badly spelled.  If there are no spelling mistakes the
+--- result is an empty string.
+---
+--- The return value is a list with two items:
+--- - The badly spelled word or an empty string.
+--- - The type of the spelling error:
+---   "bad"    spelling mistake
+---   "rare"    rare word
+---   "local"    word only valid in another region
+---   "caps"    word should start with Capital
+--- Example: >vim
+---   echo spellbadword("the quik brown fox")
+--- <  ['quik', 'bad'] ~
+---
+--- The spelling information for the current window and the value
+--- of 'spelllang' are used.
+---
+--- @param sentence? any
+--- @return any
+function vim.fn.spellbadword(sentence) end
+
+--- Return a |List| with spelling suggestions to replace {word}.
+--- When {max} is given up to this number of suggestions are
+--- returned.  Otherwise up to 25 suggestions are returned.
+---
+--- When the {capital} argument is given and it's non-zero only
+--- suggestions with a leading capital will be given.  Use this
+--- after a match with 'spellcapcheck'.
+---
+--- {word} can be a badly spelled word followed by other text.
+--- This allows for joining two words that were split.  The
+--- suggestions also include the following text, thus you can
+--- replace a line.
+---
+--- {word} may also be a good word.  Similar words will then be
+--- returned.  {word} itself is not included in the suggestions,
+--- although it may appear capitalized.
+---
+--- The spelling information for the current window is used.  The
+--- values of 'spelllang' and 'spellsuggest' are used.
+---
+--- @param word any
+--- @param max? any
+--- @param capital? any
+--- @return any
+function vim.fn.spellsuggest(word, max, capital) end
+
+--- Make a |List| out of {string}.  When {pattern} is omitted or
+--- empty each white-separated sequence of characters becomes an
+--- item.
+--- Otherwise the string is split where {pattern} matches,
+--- removing the matched characters. 'ignorecase' is not used
+--- here, add \c to ignore case. |/\c|
+--- When the first or last item is empty it is omitted, unless the
+--- {keepempty} argument is given and it's non-zero.
+--- Other empty items are kept when {pattern} matches at least one
+--- character or when {keepempty} is non-zero.
+--- Example: >vim
+---   let words = split(getline('.'), '\W\+')
+--- <To split a string in individual characters: >vim
+---   for c in split(mystring, '\zs') | endfor
+--- <If you want to keep the separator you can also use '\zs' at
+--- the end of the pattern: >vim
+---   echo split('abc:def:ghi', ':\zs')
+--- < >
+---   ['abc:', 'def:', 'ghi']
+--- <
+--- Splitting a table where the first element can be empty: >vim
+---   let items = split(line, ':', 1)
+--- <The opposite function is |join()|.
+---
+--- @param string string
+--- @param pattern? any
+--- @param keepempty? any
+--- @return any
+function vim.fn.split(string, pattern, keepempty) end
+
+--- Return the non-negative square root of Float {expr} as a
+--- |Float|.
+--- {expr} must evaluate to a |Float| or a |Number|.  When {expr}
+--- is negative the result is NaN (Not a Number).  Returns 0.0 if
+--- {expr} is not a |Float| or a |Number|.
+--- Examples: >vim
+---   echo sqrt(100)
+--- <  10.0 >vim
+---   echo sqrt(-4.01)
+--- <  str2float("nan")
+--- NaN may be different, it depends on system libraries.
+---
+--- @param expr any
+--- @return any
+function vim.fn.sqrt(expr) end
+
+--- Initialize seed used by |rand()|:
+--- - If {expr} is not given, seed values are initialized by
+---   reading from /dev/urandom, if possible, or using time(NULL)
+---   a.k.a. epoch time otherwise; this only has second accuracy.
+--- - If {expr} is given it must be a Number.  It is used to
+---   initialize the seed values.  This is useful for testing or
+---   when a predictable sequence is intended.
+---
+--- Examples: >vim
+---   let seed = srand()
+---   let seed = srand(userinput)
+---   echo rand(seed)
+--- <
+---
+--- @param expr? any
+--- @return any
+function vim.fn.srand(expr) end
+
+--- Return a string which contains characters indicating the
+--- current state.  Mostly useful in callbacks that want to do
+--- work that may not always be safe.  Roughly this works like:
+--- - callback uses state() to check if work is safe to do.
+---   Yes: then do it right away.
+---   No:  add to work queue and add a |SafeState| autocommand.
+--- - When SafeState is triggered and executes your autocommand,
+---   check with `state()` if the work can be done now, and if yes
+---   remove it from the queue and execute.
+---   Remove the autocommand if the queue is now empty.
+--- Also see |mode()|.
+---
+--- When {what} is given only characters in this string will be
+--- added.  E.g, this checks if the screen has scrolled: >vim
+---   if state('s') == ''
+---      " screen has not scrolled
+--- <
+--- These characters indicate the state, generally indicating that
+--- something is busy:
+---     m  halfway a mapping, :normal command, feedkeys() or
+---   stuffed command
+---     o  operator pending, e.g. after |d|
+---     a  Insert mode autocomplete active
+---     x  executing an autocommand
+---     S  not triggering SafeState, e.g. after |f| or a count
+---     c  callback invoked, including timer (repeats for
+---   recursiveness up to "ccc")
+---     s  screen has scrolled for messages
+---
+--- @param what? string
+--- @return any
+function vim.fn.state(what) end
+
+--- With |--headless| this opens stdin and stdout as a |channel|.
+--- May be called only once. See |channel-stdio|. stderr is not
+--- handled by this function, see |v:stderr|.
+---
+--- Close the stdio handles with |chanclose()|. Use |chansend()|
+--- to send data to stdout, and |rpcrequest()| and |rpcnotify()|
+--- to communicate over RPC.
+---
+--- {opts} is a dictionary with these keys:
+---   |on_stdin| : callback invoked when stdin is written to.
+---   on_print : callback invoked when Nvim needs to print a
+---        message, with the message (whose type is string)
+---        as sole argument.
+---   stdin_buffered : read stdin in |channel-buffered| mode.
+---   rpc      : If set, |msgpack-rpc| will be used to communicate
+---        over stdio
+--- Returns:
+---   - |channel-id| on success (value is always 1)
+---   - 0 on invalid arguments
+---
+--- @param opts table
+--- @return any
+function vim.fn.stdioopen(opts) end
+
+--- Returns |standard-path| locations of various default files and
+--- directories.
+---
+--- {what}       Type    Description ~
+--- cache        String  Cache directory: arbitrary temporary
+---                      storage for plugins, etc.
+--- config       String  User configuration directory. |init.vim|
+---                      is stored here.
+--- config_dirs  List    Other configuration directories.
+--- data         String  User data directory.
+--- data_dirs    List    Other data directories.
+--- log          String  Logs directory (for use by plugins too).
+--- run          String  Run directory: temporary, local storage
+---          for sockets, named pipes, etc.
+--- state        String  Session state directory: storage for file
+---          drafts, swap, undo, |shada|.
+---
+--- Example: >vim
+---   echo stdpath("config")
+--- <
+---
+--- @param what 'cache'|'config'|'config_dirs'|'data'|'data_dirs'|'log'|'run'|'state'
+--- @return string|string[]
+function vim.fn.stdpath(what) end
+
+--- Convert String {string} to a Float.  This mostly works the
+--- same as when using a floating point number in an expression,
+--- see |floating-point-format|.  But it's a bit more permissive.
+--- E.g., "1e40" is accepted, while in an expression you need to
+--- write "1.0e40".  The hexadecimal form "0x123" is also
+--- accepted, but not others, like binary or octal.
+--- When {quoted} is present and non-zero then embedded single
+--- quotes before the dot are ignored, thus "1'000.0" is a
+--- thousand.
+--- Text after the number is silently ignored.
+--- The decimal point is always '.', no matter what the locale is
+--- set to.  A comma ends the number: "12,345.67" is converted to
+--- 12.0.  You can strip out thousands separators with
+--- |substitute()|: >vim
+---   let f = str2float(substitute(text, ',', '', 'g'))
+--- <
+--- Returns 0.0 if the conversion fails.
+---
+--- @param string string
+--- @param quoted? any
+--- @return any
+function vim.fn.str2float(string, quoted) end
+
+--- Return a list containing the number values which represent
+--- each character in String {string}.  Examples: >vim
+---   echo str2list(" ")    " returns [32]
+---   echo str2list("ABC")    " returns [65, 66, 67]
+--- <|list2str()| does the opposite.
+---
+--- UTF-8 encoding is always used, {utf8} option has no effect,
+--- and exists only for backwards-compatibility.
+--- With UTF-8 composing characters are handled properly: >vim
+---   echo str2list("á")    " returns [97, 769]
+---
+--- @param string string
+--- @param utf8? any
+--- @return any
+function vim.fn.str2list(string, utf8) end
+
+--- Convert string {string} to a number.
+--- {base} is the conversion base, it can be 2, 8, 10 or 16.
+--- When {quoted} is present and non-zero then embedded single
+--- quotes are ignored, thus "1'000'000" is a million.
+---
+--- When {base} is omitted base 10 is used.  This also means that
+--- a leading zero doesn't cause octal conversion to be used, as
+--- with the default String to Number conversion.  Example: >vim
+---   let nr = str2nr('0123')
+--- <
+--- When {base} is 16 a leading "0x" or "0X" is ignored.  With a
+--- different base the result will be zero. Similarly, when
+--- {base} is 8 a leading "0", "0o" or "0O" is ignored, and when
+--- {base} is 2 a leading "0b" or "0B" is ignored.
+--- Text after the number is silently ignored.
+---
+--- Returns 0 if {string} is empty or on error.
+---
+--- @param string string
+--- @param base? any
+--- @return any
+function vim.fn.str2nr(string, base) end
+
+--- The result is a Number, which is the number of characters
+--- in String {string}.  Composing characters are ignored.
+--- |strchars()| can count the number of characters, counting
+--- composing characters separately.
+---
+--- Returns 0 if {string} is empty or on error.
+---
+--- Also see |strlen()|, |strdisplaywidth()| and |strwidth()|.
+---
+--- @param string string
+--- @return any
+function vim.fn.strcharlen(string) end
+
+--- Like |strpart()| but using character index and length instead
+--- of byte index and length.
+--- When {skipcc} is omitted or zero, composing characters are
+--- counted separately.
+--- When {skipcc} set to 1, Composing characters are ignored,
+--- similar to  |slice()|.
+--- When a character index is used where a character does not
+--- exist it is omitted and counted as one character.  For
+--- example: >vim
+---   echo strcharpart('abc', -1, 2)
+--- <results in 'a'.
+---
+--- Returns an empty string on error.
+---
+--- @param src any
+--- @param start any
+--- @param len? any
+--- @param skipcc? any
+--- @return any
+function vim.fn.strcharpart(src, start, len, skipcc) end
+
+--- The result is a Number, which is the number of characters
+--- in String {string}.
+--- When {skipcc} is omitted or zero, composing characters are
+--- counted separately.
+--- When {skipcc} set to 1, Composing characters are ignored.
+--- |strcharlen()| always does this.
+---
+--- Returns zero on error.
+---
+--- Also see |strlen()|, |strdisplaywidth()| and |strwidth()|.
+---
+--- {skipcc} is only available after 7.4.755.  For backward
+--- compatibility, you can define a wrapper function: >vim
+---     if has("patch-7.4.755")
+---       function s:strchars(str, skipcc)
+---   return strchars(a:str, a:skipcc)
+---       endfunction
+---     else
+---       function s:strchars(str, skipcc)
+---   if a:skipcc
+---     return strlen(substitute(a:str, ".", "x", "g"))
+---   else
+---     return strchars(a:str)
+---   endif
+---       endfunction
+---     endif
+--- <
+---
+--- @param string string
+--- @param skipcc? any
+--- @return integer
+function vim.fn.strchars(string, skipcc) end
+
+--- The result is a Number, which is the number of display cells
+--- String {string} occupies on the screen when it starts at {col}
+--- (first column is zero).  When {col} is omitted zero is used.
+--- Otherwise it is the screen column where to start.  This
+--- matters for Tab characters.
+--- The option settings of the current window are used.  This
+--- matters for anything that's displayed differently, such as
+--- 'tabstop' and 'display'.
+--- When {string} contains characters with East Asian Width Class
+--- Ambiguous, this function's return value depends on 'ambiwidth'.
+--- Returns zero on error.
+--- Also see |strlen()|, |strwidth()| and |strchars()|.
+---
+--- @param string string
+--- @param col? integer
+--- @return integer
+function vim.fn.strdisplaywidth(string, col) end
+
+--- The result is a String, which is a formatted date and time, as
+--- specified by the {format} string.  The given {time} is used,
+--- or the current time if no time is given.  The accepted
+--- {format} depends on your system, thus this is not portable!
+--- See the manual page of the C function strftime() for the
+--- format.  The maximum length of the result is 80 characters.
+--- See also |localtime()|, |getftime()| and |strptime()|.
+--- The language can be changed with the |:language| command.
+--- Examples: >vim
+---   echo strftime("%c")       " Sun Apr 27 11:49:23 1997
+---   echo strftime("%Y %b %d %X")     " 1997 Apr 27 11:53:25
+---   echo strftime("%y%m%d %T")     " 970427 11:53:55
+---   echo strftime("%H:%M")       " 11:55
+---   echo strftime("%c", getftime("file.c"))
+---            " Show mod time of file.c.
+---
+--- @param format any
+--- @param time? any
+--- @return string
+function vim.fn.strftime(format, time) end
+
+--- Get a Number corresponding to the character at {index} in
+--- {str}.  This uses a zero-based character index, not a byte
+--- index.  Composing characters are considered separate
+--- characters here.  Use |nr2char()| to convert the Number to a
+--- String.
+--- Returns -1 if {index} is invalid.
+--- Also see |strcharpart()| and |strchars()|.
+---
+--- @param str string
+--- @param index integer
+--- @return integer
+function vim.fn.strgetchar(str, index) end
+
+--- The result is a Number, which gives the byte index in
+--- {haystack} of the first occurrence of the String {needle}.
+--- If {start} is specified, the search starts at index {start}.
+--- This can be used to find a second match: >vim
+---   let colon1 = stridx(line, ":")
+---   let colon2 = stridx(line, ":", colon1 + 1)
+--- <The search is done case-sensitive.
+--- For pattern searches use |match()|.
+--- -1 is returned if the {needle} does not occur in {haystack}.
+--- See also |strridx()|.
+--- Examples: >vim
+---   echo stridx("An Example", "Example")     " 3
+---   echo stridx("Starting point", "Start")   " 0
+---   echo stridx("Starting point", "start")   " -1
+--- <        *strstr()* *strchr()*
+--- stridx() works similar to the C function strstr().  When used
+--- with a single character it works similar to strchr().
+---
+--- @param haystack string
+--- @param needle string
+--- @param start? integer
+--- @return integer
+function vim.fn.stridx(haystack, needle, start) end
+
+--- Return {expr} converted to a String.  If {expr} is a Number,
+--- Float, String, Blob or a composition of them, then the result
+--- can be parsed back with |eval()|.
+---   {expr} type  result ~
+---   String    'string'
+---   Number    123
+---   Float    123.123456 or 1.123456e8 or
+---       `str2float('inf')`
+---   Funcref    `function('name')`
+---   Blob    0z00112233.44556677.8899
+---   List    [item, item]
+---   Dictionary  `{key: value, key: value}`
+--- Note that in String values the ' character is doubled.
+--- Also see |strtrans()|.
+--- Note 2: Output format is mostly compatible with YAML, except
+--- for infinite and NaN floating-point values representations
+--- which use |str2float()|.  Strings are also dumped literally,
+--- only single quote is escaped, which does not allow using YAML
+--- for parsing back binary strings.  |eval()| should always work for
+--- strings and floats though and this is the only official
+--- method, use |msgpackdump()| or |json_encode()| if you need to
+--- share data with other application.
+---
+--- @param expr any
+--- @return string
+function vim.fn.string(expr) end
+
+--- The result is a Number, which is the length of the String
+--- {string} in bytes.
+--- If the argument is a Number it is first converted to a String.
+--- For other types an error is given and zero is returned.
+--- If you want to count the number of multibyte characters use
+--- |strchars()|.
+--- Also see |len()|, |strdisplaywidth()| and |strwidth()|.
+---
+--- @param string string
+--- @return integer
+function vim.fn.strlen(string) end
+
+--- The result is a String, which is part of {src}, starting from
+--- byte {start}, with the byte length {len}.
+--- When {chars} is present and TRUE then {len} is the number of
+--- characters positions (composing characters are not counted
+--- separately, thus "1" means one base character and any
+--- following composing characters).
+--- To count {start} as characters instead of bytes use
+--- |strcharpart()|.
+---
+--- When bytes are selected which do not exist, this doesn't
+--- result in an error, the bytes are simply omitted.
+--- If {len} is missing, the copy continues from {start} till the
+--- end of the {src}. >vim
+---   echo strpart("abcdefg", 3, 2)    " returns 'de'
+---   echo strpart("abcdefg", -2, 4)   " returns 'ab'
+---   echo strpart("abcdefg", 5, 4)    " returns 'fg'
+---   echo strpart("abcdefg", 3)   " returns 'defg'
+---
+--- <Note: To get the first character, {start} must be 0.  For
+--- example, to get the character under the cursor: >vim
+---   strpart(getline("."), col(".") - 1, 1, v:true)
+--- <
+--- Returns an empty string on error.
+---
+--- @param src string
+--- @param start integer
+--- @param len? integer
+--- @param chars? 0|1
+--- @return string
+function vim.fn.strpart(src, start, len, chars) end
+
+--- The result is a Number, which is a unix timestamp representing
+--- the date and time in {timestring}, which is expected to match
+--- the format specified in {format}.
+---
+--- The accepted {format} depends on your system, thus this is not
+--- portable!  See the manual page of the C function strptime()
+--- for the format.  Especially avoid "%c".  The value of $TZ also
+--- matters.
+---
+--- If the {timestring} cannot be parsed with {format} zero is
+--- returned.  If you do not know the format of {timestring} you
+--- can try different {format} values until you get a non-zero
+--- result.
+---
+--- See also |strftime()|.
+--- Examples: >vim
+---   echo strptime("%Y %b %d %X", "1997 Apr 27 11:49:23")
+--- <  862156163 >vim
+---   echo strftime("%c", strptime("%y%m%d %T", "970427 11:53:55"))
+--- <  Sun Apr 27 11:53:55 1997 >vim
+---   echo strftime("%c", strptime("%Y%m%d%H%M%S", "19970427115355") + 3600)
+--- <  Sun Apr 27 12:53:55 1997
+---
+--- @param format string
+--- @param timestring string
+--- @return integer
+function vim.fn.strptime(format, timestring) end
+
+--- The result is a Number, which gives the byte index in
+--- {haystack} of the last occurrence of the String {needle}.
+--- When {start} is specified, matches beyond this index are
+--- ignored.  This can be used to find a match before a previous
+--- match: >vim
+---   let lastcomma = strridx(line, ",")
+---   let comma2 = strridx(line, ",", lastcomma - 1)
+--- <The search is done case-sensitive.
+--- For pattern searches use |match()|.
+--- -1 is returned if the {needle} does not occur in {haystack}.
+--- If the {needle} is empty the length of {haystack} is returned.
+--- See also |stridx()|.  Examples: >vim
+---   echo strridx("an angry armadillo", "an")       3
+--- <          *strrchr()*
+--- When used with a single character it works similar to the C
+--- function strrchr().
+---
+--- @param haystack string
+--- @param needle string
+--- @param start? integer
+--- @return integer
+function vim.fn.strridx(haystack, needle, start) end
+
+--- The result is a String, which is {string} with all unprintable
+--- characters translated into printable characters |'isprint'|.
+--- Like they are shown in a window.  Example: >vim
+---   echo strtrans(\@a)
+--- <This displays a newline in register a as "^\@" instead of
+--- starting a new line.
+---
+--- Returns an empty string on error.
+---
+--- @param string string
+--- @return string
+function vim.fn.strtrans(string) end
+
+--- The result is a Number, which is the number of UTF-16 code
+--- units in String {string} (after converting it to UTF-16).
+---
+--- When {countcc} is TRUE, composing characters are counted
+--- separately.
+--- When {countcc} is omitted or FALSE, composing characters are
+--- ignored.
+---
+--- Returns zero on error.
+---
+--- Also see |strlen()| and |strcharlen()|.
+--- Examples: >vim
+---     echo strutf16len('a')    " returns 1
+---     echo strutf16len('©')    " returns 1
+---     echo strutf16len('😊')    " returns 2
+---     echo strutf16len('ą́')    " returns 1
+---     echo strutf16len('ą́', v:true)  " returns 3
+--- <
+---
+--- @param string string
+--- @param countcc? 0|1
+--- @return integer
+function vim.fn.strutf16len(string, countcc) end
+
+--- The result is a Number, which is the number of display cells
+--- String {string} occupies.  A Tab character is counted as one
+--- cell, alternatively use |strdisplaywidth()|.
+--- When {string} contains characters with East Asian Width Class
+--- Ambiguous, this function's return value depends on 'ambiwidth'.
+--- Returns zero on error.
+--- Also see |strlen()|, |strdisplaywidth()| and |strchars()|.
+---
+--- @param string string
+--- @return integer
+function vim.fn.strwidth(string) end
+
+--- Only for an expression in a |:substitute| command or
+--- substitute() function.
+--- Returns the {nr}th submatch of the matched text.  When {nr}
+--- is 0 the whole matched text is returned.
+--- Note that a NL in the string can stand for a line break of a
+--- multi-line match or a NUL character in the text.
+--- Also see |sub-replace-expression|.
+---
+--- If {list} is present and non-zero then submatch() returns
+--- a list of strings, similar to |getline()| with two arguments.
+--- NL characters in the text represent NUL characters in the
+--- text.
+--- Only returns more than one item for |:substitute|, inside
+--- |substitute()| this list will always contain one or zero
+--- items, since there are no real line breaks.
+---
+--- When substitute() is used recursively only the submatches in
+--- the current (deepest) call can be obtained.
+---
+--- Returns an empty string or list on error.
+---
+--- Examples: >vim
+---   s/\d\+/\=submatch(0) + 1/
+---   echo substitute(text, '\d\+', '\=submatch(0) + 1', '')
+--- <This finds the first number in the line and adds one to it.
+--- A line break is included as a newline character.
+---
+--- @param nr integer
+--- @param list? integer
+--- @return string|string[]
+function vim.fn.submatch(nr, list) end
+
+--- The result is a String, which is a copy of {string}, in which
+--- the first match of {pat} is replaced with {sub}.
+--- When {flags} is "g", all matches of {pat} in {string} are
+--- replaced.  Otherwise {flags} should be "".
+---
+--- This works like the ":substitute" command (without any flags).
+--- But the matching with {pat} is always done like the 'magic'
+--- option is set and 'cpoptions' is empty (to make scripts
+--- portable).  'ignorecase' is still relevant, use |/\c| or |/\C|
+--- if you want to ignore or match case and ignore 'ignorecase'.
+--- 'smartcase' is not used.  See |string-match| for how {pat} is
+--- used.
+---
+--- A "~" in {sub} is not replaced with the previous {sub}.
+--- Note that some codes in {sub} have a special meaning
+--- |sub-replace-special|.  For example, to replace something with
+--- "\n" (two characters), use "\\\\n" or '\\n'.
+---
+--- When {pat} does not match in {string}, {string} is returned
+--- unmodified.
+---
+--- Example: >vim
+---   let &path = substitute(&path, ",\\=[^,]*$", "", "")
+--- <This removes the last component of the 'path' option. >vim
+---   echo substitute("testing", ".*", "\\U\\0", "")
+--- <results in "TESTING".
+---
+--- When {sub} starts with "\=", the remainder is interpreted as
+--- an expression. See |sub-replace-expression|.  Example: >vim
+---   echo substitute(s, '%\(\x\x\)',
+---      \ '\=nr2char("0x" .. submatch(1))', 'g')
+---
+--- <When {sub} is a Funcref that function is called, with one
+--- optional argument.  Example: >vim
+---    echo substitute(s, '%\(\x\x\)', SubNr, 'g')
+--- <The optional argument is a list which contains the whole
+--- matched string and up to nine submatches, like what
+--- |submatch()| returns.  Example: >vim
+---    echo substitute(s, '%\(\x\x\)', {m -> '0x' .. m[1]}, 'g')
+---
+--- <Returns an empty string on error.
+---
+--- @param string string
+--- @param pat string
+--- @param sub string
+--- @param flags string
+--- @return string
+function vim.fn.substitute(string, pat, sub, flags) end
+
+--- Returns a list of swap file names, like what "vim -r" shows.
+--- See the |-r| command argument.  The 'directory' option is used
+--- for the directories to inspect.  If you only want to get a
+--- list of swap files in the current directory then temporarily
+--- set 'directory' to a dot: >vim
+---   let save_dir = &directory
+---   let &directory = '.'
+---   let swapfiles = swapfilelist()
+---   let &directory = save_dir
+---
+--- @return string[]
+function vim.fn.swapfilelist() end
+
+--- The result is a dictionary, which holds information about the
+--- swapfile {fname}. The available fields are:
+---   version Vim version
+---   user  user name
+---   host  host name
+---   fname  original file name
+---   pid  PID of the Nvim process that created the swap
+---     file, or zero if not running.
+---   mtime  last modification time in seconds
+---   inode  Optional: INODE number of the file
+---   dirty  1 if file was modified, 0 if not
+--- In case of failure an "error" item is added with the reason:
+---   Cannot open file: file not found or in accessible
+---   Cannot read file: cannot read first block
+---   Not a swap file: does not contain correct block ID
+---   Magic number mismatch: Info in first block is invalid
+---
+--- @param fname string
+--- @return any
+function vim.fn.swapinfo(fname) end
+
+--- The result is the swap file path of the buffer {buf}.
+--- For the use of {buf}, see |bufname()| above.
+--- If buffer {buf} is the current buffer, the result is equal to
+--- |:swapname| (unless there is no swap file).
+--- If buffer {buf} has no swap file, returns an empty string.
+---
+--- @param buf integer|string
+--- @return string
+function vim.fn.swapname(buf) end
+
+--- The result is a Number, which is the syntax ID at the position
+--- {lnum} and {col} in the current window.
+--- The syntax ID can be used with |synIDattr()| and
+--- |synIDtrans()| to obtain syntax information about text.
+---
+--- {col} is 1 for the leftmost column, {lnum} is 1 for the first
+--- line.  'synmaxcol' applies, in a longer line zero is returned.
+--- Note that when the position is after the last character,
+--- that's where the cursor can be in Insert mode, synID() returns
+--- zero.  {lnum} is used like with |getline()|.
+---
+--- When {trans} is |TRUE|, transparent items are reduced to the
+--- item that they reveal.  This is useful when wanting to know
+--- the effective color.  When {trans} is |FALSE|, the transparent
+--- item is returned.  This is useful when wanting to know which
+--- syntax item is effective (e.g. inside parens).
+--- Warning: This function can be very slow.  Best speed is
+--- obtained by going through the file in forward direction.
+---
+--- Returns zero on error.
+---
+--- Example (echoes the name of the syntax item under the cursor): >vim
+---   echo synIDattr(synID(line("."), col("."), 1), "name")
+--- <
+---
+--- @param lnum integer
+--- @param col integer
+--- @param trans 0|1
+--- @return integer
+function vim.fn.synID(lnum, col, trans) end
+
+--- The result is a String, which is the {what} attribute of
+--- syntax ID {synID}.  This can be used to obtain information
+--- about a syntax item.
+--- {mode} can be "gui" or "cterm", to get the attributes
+--- for that mode.  When {mode} is omitted, or an invalid value is
+--- used, the attributes for the currently active highlighting are
+--- used (GUI or cterm).
+--- Use synIDtrans() to follow linked highlight groups.
+--- {what}    result
+--- "name"    the name of the syntax item
+--- "fg"    foreground color (GUI: color name used to set
+---     the color, cterm: color number as a string,
+---     term: empty string)
+--- "bg"    background color (as with "fg")
+--- "font"    font name (only available in the GUI)
+---     |highlight-font|
+--- "sp"    special color (as with "fg") |guisp|
+--- "fg#"    like "fg", but for the GUI and the GUI is
+---     running the name in "#RRGGBB" form
+--- "bg#"    like "fg#" for "bg"
+--- "sp#"    like "fg#" for "sp"
+--- "bold"    "1" if bold
+--- "italic"  "1" if italic
+--- "reverse"  "1" if reverse
+--- "inverse"  "1" if inverse (= reverse)
+--- "standout"  "1" if standout
+--- "underline"  "1" if underlined
+--- "undercurl"  "1" if undercurled
+--- "underdouble"  "1" if double underlined
+--- "underdotted"  "1" if dotted underlined
+--- "underdashed"  "1" if dashed underlined
+--- "strikethrough"  "1" if struckthrough
+--- "altfont"  "1" if alternative font
+--- "nocombine"  "1" if nocombine
+---
+--- Returns an empty string on error.
+---
+--- Example (echoes the color of the syntax item under the
+--- cursor): >vim
+---   echo synIDattr(synIDtrans(synID(line("."), col("."), 1)), "fg")
+--- <
+--- Can also be used as a |method|: >vim
+---   echo synID(line("."), col("."), 1)->synIDtrans()->synIDattr("fg")
+--- <
+---
+--- @param synID integer
+--- @param what string
+--- @param mode? string
+--- @return string
+function vim.fn.synIDattr(synID, what, mode) end
+
+--- The result is a Number, which is the translated syntax ID of
+--- {synID}.  This is the syntax group ID of what is being used to
+--- highlight the character.  Highlight links given with
+--- ":highlight link" are followed.
+---
+--- Returns zero on error.
+---
+--- @param synID integer
+--- @return integer
+function vim.fn.synIDtrans(synID) end
+
+--- The result is a |List| with currently three items:
+--- 1. The first item in the list is 0 if the character at the
+---    position {lnum} and {col} is not part of a concealable
+---    region, 1 if it is.  {lnum} is used like with |getline()|.
+--- 2. The second item in the list is a string. If the first item
+---    is 1, the second item contains the text which will be
+---    displayed in place of the concealed text, depending on the
+---    current setting of 'conceallevel' and 'listchars'.
+--- 3. The third and final item in the list is a number
+---    representing the specific syntax region matched in the
+---    line. When the character is not concealed the value is
+---    zero. This allows detection of the beginning of a new
+---    concealable region if there are two consecutive regions
+---    with the same replacement character.  For an example, if
+---    the text is "123456" and both "23" and "45" are concealed
+---    and replaced by the character "X", then:
+---   call      returns ~
+---   synconcealed(lnum, 1)   [0, '', 0]
+---   synconcealed(lnum, 2)   [1, 'X', 1]
+---   synconcealed(lnum, 3)   [1, 'X', 1]
+---   synconcealed(lnum, 4)   [1, 'X', 2]
+---   synconcealed(lnum, 5)   [1, 'X', 2]
+---   synconcealed(lnum, 6)   [0, '', 0]
+---
+--- @param lnum integer
+--- @param col integer
+--- @return {[1]: integer, [2]: string, [3]: integer}[]
+function vim.fn.synconcealed(lnum, col) end
+
+--- Return a |List|, which is the stack of syntax items at the
+--- position {lnum} and {col} in the current window.  {lnum} is
+--- used like with |getline()|.  Each item in the List is an ID
+--- like what |synID()| returns.
+--- The first item in the List is the outer region, following are
+--- items contained in that one.  The last one is what |synID()|
+--- returns, unless not the whole item is highlighted or it is a
+--- transparent item.
+--- This function is useful for debugging a syntax file.
+--- Example that shows the syntax stack under the cursor: >vim
+---   for id in synstack(line("."), col("."))
+---      echo synIDattr(id, "name")
+---   endfor
+--- <When the position specified with {lnum} and {col} is invalid
+--- an empty list is returned.  The position just after the last
+--- character in a line and the first column in an empty line are
+--- valid positions.
+---
+--- @param lnum integer
+--- @param col integer
+--- @return integer[]
+function vim.fn.synstack(lnum, col) end
+
+--- Note: Prefer |vim.system()| in Lua.
+---
+--- Gets the output of {cmd} as a |string| (|systemlist()| returns
+--- a |List|) and sets |v:shell_error| to the error code.
+--- {cmd} is treated as in |jobstart()|:
+--- If {cmd} is a List it runs directly (no 'shell').
+--- If {cmd} is a String it runs in the 'shell', like this: >vim
+---   call jobstart(split(&shell) + split(&shellcmdflag) + ['{cmd}'])
+---
+--- <Not to be used for interactive commands.
+---
+--- Result is a String, filtered to avoid platform-specific quirks:
+--- - <CR><NL> is replaced with <NL>
+--- - NUL characters are replaced with SOH (0x01)
+---
+--- Example: >vim
+---     echo system(['ls', expand('%:h')])
+---
+--- <If {input} is a string it is written to a pipe and passed as
+--- stdin to the command.  The string is written as-is, line
+--- separators are not changed.
+--- If {input} is a |List| it is written to the pipe as
+--- |writefile()| does with {binary} set to "b" (i.e. with
+--- a newline between each list item, and newlines inside list
+--- items converted to NULs).
+--- When {input} is given and is a valid buffer id, the content of
+--- the buffer is written to the file line by line, each line
+--- terminated by NL (and NUL where the text has NL).
+---             *E5677*
+--- Note: system() cannot write to or read from backgrounded ("&")
+--- shell commands, e.g.: >vim
+---     echo system("cat - &", "foo")
+--- <which is equivalent to: >
+---     $ echo foo | bash -c 'cat - &'
+--- <The pipes are disconnected (unless overridden by shell
+--- redirection syntax) before input can reach it. Use
+--- |jobstart()| instead.
+---
+--- Note: Use |shellescape()| or |::S| with |expand()| or
+--- |fnamemodify()| to escape special characters in a command
+--- argument. 'shellquote' and 'shellxquote' must be properly
+--- configured. Example: >vim
+---     echo system('ls '..shellescape(expand('%:h')))
+---     echo system('ls '..expand('%:h:S'))
+---
+--- <Unlike ":!cmd" there is no automatic check for changed files.
+--- Use |:checktime| to force a check.
+---
+--- @param cmd string|string[]
+--- @param input? string|string[]|integer
+--- @return string
+function vim.fn.system(cmd, input) end
+
+--- Same as |system()|, but returns a |List| with lines (parts of
+--- output separated by NL) with NULs transformed into NLs. Output
+--- is the same as |readfile()| will output with {binary} argument
+--- set to "b", except that a final newline is not preserved,
+--- unless {keepempty} is non-zero.
+--- Note that on MS-Windows you may get trailing CR characters.
+---
+--- To see the difference between "echo hello" and "echo -n hello"
+--- use |system()| and |split()|: >vim
+---   echo split(system('echo hello'), '\n', 1)
+--- <
+--- Returns an empty string on error.
+---
+--- @param cmd string|string[]
+--- @param input? string|string[]|integer
+--- @param keepempty? integer
+--- @return string[]
+function vim.fn.systemlist(cmd, input, keepempty) end
+
+--- The result is a |List|, where each item is the number of the
+--- buffer associated with each window in the current tab page.
+--- {arg} specifies the number of the tab page to be used. When
+--- omitted the current tab page is used.
+--- When {arg} is invalid the number zero is returned.
+--- To get a list of all buffers in all tabs use this: >vim
+---   let buflist = []
+---   for i in range(tabpagenr('$'))
+---      call extend(buflist, tabpagebuflist(i + 1))
+---   endfor
+--- <Note that a buffer may appear in more than one window.
+---
+--- @param arg? any
+--- @return any
+function vim.fn.tabpagebuflist(arg) end
+
+--- The result is a Number, which is the number of the current
+--- tab page.  The first tab page has number 1.
+---
+--- The optional argument {arg} supports the following values:
+---   $  the number of the last tab page (the tab page
+---     count).
+---   #  the number of the last accessed tab page
+---     (where |g<Tab>| goes to).  If there is no
+---     previous tab page, 0 is returned.
+--- The number can be used with the |:tab| command.
+---
+--- Returns zero on error.
+---
+--- @param arg? '$'|'#'
+--- @return integer
+function vim.fn.tabpagenr(arg) end
+
+--- Like |winnr()| but for tab page {tabarg}.
+--- {tabarg} specifies the number of tab page to be used.
+--- {arg} is used like with |winnr()|:
+--- - When omitted the current window number is returned.  This is
+---   the window which will be used when going to this tab page.
+--- - When "$" the number of windows is returned.
+--- - When "#" the previous window nr is returned.
+--- Useful examples: >vim
+---     tabpagewinnr(1)      " current window of tab page 1
+---     tabpagewinnr(4, '$')    " number of windows in tab page 4
+--- <When {tabarg} is invalid zero is returned.
+---
+--- @param tabarg integer
+--- @param arg? '$'|'#'
+--- @return integer
+function vim.fn.tabpagewinnr(tabarg, arg) end
+
+--- Returns a |List| with the file names used to search for tags
+--- for the current buffer.  This is the 'tags' option expanded.
+---
+--- @return string[]
+function vim.fn.tagfiles() end
+
+--- Returns a |List| of tags matching the regular expression {expr}.
+---
+--- If {filename} is passed it is used to prioritize the results
+--- in the same way that |:tselect| does. See |tag-priority|.
+--- {filename} should be the full path of the file.
+---
+--- Each list item is a dictionary with at least the following
+--- entries:
+---   name    Name of the tag.
+---   filename  Name of the file where the tag is
+---       defined.  It is either relative to the
+---       current directory or a full path.
+---   cmd    Ex command used to locate the tag in
+---       the file.
+---   kind    Type of the tag.  The value for this
+---       entry depends on the language specific
+---       kind values.  Only available when
+---       using a tags file generated by
+---       Universal/Exuberant ctags or hdrtag.
+---   static    A file specific tag.  Refer to
+---       |static-tag| for more information.
+--- More entries may be present, depending on the content of the
+--- tags file: access, implementation, inherits and signature.
+--- Refer to the ctags documentation for information about these
+--- fields.  For C code the fields "struct", "class" and "enum"
+--- may appear, they give the name of the entity the tag is
+--- contained in.
+---
+--- The ex-command "cmd" can be either an ex search pattern, a
+--- line number or a line number followed by a byte number.
+---
+--- If there are no matching tags, then an empty list is returned.
+---
+--- To get an exact tag match, the anchors '^' and '$' should be
+--- used in {expr}.  This also make the function work faster.
+--- Refer to |tag-regexp| for more information about the tag
+--- search regular expression pattern.
+---
+--- Refer to |'tags'| for information about how the tags file is
+--- located by Vim. Refer to |tags-file-format| for the format of
+--- the tags file generated by the different ctags tools.
+---
+--- @param expr any
+--- @param filename? string
+--- @return any
+function vim.fn.taglist(expr, filename) end
+
+--- Return the tangent of {expr}, measured in radians, as a |Float|
+--- in the range [-inf, inf].
+--- {expr} must evaluate to a |Float| or a |Number|.
+--- Returns 0.0 if {expr} is not a |Float| or a |Number|.
+--- Examples: >vim
+---   echo tan(10)
+--- <  0.648361 >vim
+---   echo tan(-4.01)
+--- <  -1.181502
+---
+--- @param expr number
+--- @return number
+function vim.fn.tan(expr) end
+
+--- Return the hyperbolic tangent of {expr} as a |Float| in the
+--- range [-1, 1].
+--- {expr} must evaluate to a |Float| or a |Number|.
+--- Returns 0.0 if {expr} is not a |Float| or a |Number|.
+--- Examples: >vim
+---   echo tanh(0.5)
+--- <  0.462117 >vim
+---   echo tanh(-1)
+--- <  -0.761594
+---
+--- @param expr number
+--- @return number
+function vim.fn.tanh(expr) end
+
+--- Generates a (non-existent) filename located in the Nvim root
+--- |tempdir|. Scripts can use the filename as a temporary file.
+--- Example: >vim
+---   let tmpfile = tempname()
+---   exe "redir > " .. tmpfile
+--- <
+---
+--- @return string
+function vim.fn.tempname() end
+
+--- Spawns {cmd} in a new pseudo-terminal session connected
+--- to the current (unmodified) buffer. Parameters and behavior
+--- are the same as |jobstart()| except "pty", "width", "height",
+--- and "TERM" are ignored: "height" and "width" are taken from
+--- the current window. Note that termopen() implies a "pty" arg
+--- to jobstart(), and thus has the implications documented at
+--- |jobstart()|.
+---
+--- Returns the same values as jobstart().
+---
+--- Terminal environment is initialized as in |jobstart-env|,
+--- except $TERM is set to "xterm-256color". Full behavior is
+--- described in |terminal|.
+---
+--- @param cmd any
+--- @param opts? table
+--- @return any
+function vim.fn.termopen(cmd, opts) end
+
+--- Return a list with information about timers.
+--- When {id} is given only information about this timer is
+--- returned.  When timer {id} does not exist an empty list is
+--- returned.
+--- When {id} is omitted information about all timers is returned.
+---
+--- For each timer the information is stored in a |Dictionary| with
+--- these items:
+---     "id"      the timer ID
+---     "time"      time the timer was started with
+---     "repeat"      number of times the timer will still fire;
+---         -1 means forever
+---     "callback"      the callback
+---
+--- @param id? any
+--- @return any
+function vim.fn.timer_info(id) end
+
+--- Pause or unpause a timer.  A paused timer does not invoke its
+--- callback when its time expires.  Unpausing a timer may cause
+--- the callback to be invoked almost immediately if enough time
+--- has passed.
+---
+--- Pausing a timer is useful to avoid the callback to be called
+--- for a short time.
+---
+--- If {paused} evaluates to a non-zero Number or a non-empty
+--- String, then the timer is paused, otherwise it is unpaused.
+--- See |non-zero-arg|.
+---
+--- @param timer any
+--- @param paused any
+--- @return any
+function vim.fn.timer_pause(timer, paused) end
+
+--- Create a timer and return the timer ID.
+---
+--- {time} is the waiting time in milliseconds. This is the
+--- minimum time before invoking the callback.  When the system is
+--- busy or Vim is not waiting for input the time will be longer.
+--- Zero can be used to execute the callback when Vim is back in
+--- the main loop.
+---
+--- {callback} is the function to call.  It can be the name of a
+--- function or a |Funcref|.  It is called with one argument, which
+--- is the timer ID.  The callback is only invoked when Vim is
+--- waiting for input.
+---
+--- {options} is a dictionary.  Supported entries:
+---    "repeat"  Number of times to repeat the callback.
+---     -1 means forever.  Default is 1.
+---     If the timer causes an error three times in a
+---     row the repeat is cancelled.
+---
+--- Returns -1 on error.
+---
+--- Example: >vim
+---   func MyHandler(timer)
+---     echo 'Handler called'
+---   endfunc
+---   let timer = timer_start(500, 'MyHandler',
+---     \ {'repeat': 3})
+--- <This invokes MyHandler() three times at 500 msec intervals.
+---
+--- @param time any
+--- @param callback any
+--- @param options? table
+--- @return any
+function vim.fn.timer_start(time, callback, options) end
+
+--- Stop a timer.  The timer callback will no longer be invoked.
+--- {timer} is an ID returned by timer_start(), thus it must be a
+--- Number.  If {timer} does not exist there is no error.
+---
+--- @param timer any
+--- @return any
+function vim.fn.timer_stop(timer) end
+
+--- Stop all timers.  The timer callbacks will no longer be
+--- invoked.  Useful if some timers is misbehaving.  If there are
+--- no timers there is no error.
+---
+--- @return any
+function vim.fn.timer_stopall() end
+
+--- The result is a copy of the String given, with all uppercase
+--- characters turned into lowercase (just like applying |gu| to
+--- the string).  Returns an empty string on error.
+---
+--- @param expr any
+--- @return string
+function vim.fn.tolower(expr) end
+
+--- The result is a copy of the String given, with all lowercase
+--- characters turned into uppercase (just like applying |gU| to
+--- the string).  Returns an empty string on error.
+---
+--- @param expr any
+--- @return string
+function vim.fn.toupper(expr) end
+
+--- The result is a copy of the {src} string with all characters
+--- which appear in {fromstr} replaced by the character in that
+--- position in the {tostr} string.  Thus the first character in
+--- {fromstr} is translated into the first character in {tostr}
+--- and so on.  Exactly like the unix "tr" command.
+--- This code also deals with multibyte characters properly.
+---
+--- Returns an empty string on error.
+---
+--- Examples: >vim
+---   echo tr("hello there", "ht", "HT")
+--- <returns "Hello THere" >vim
+---   echo tr("<blob>", "<>", "{}")
+--- <returns "{blob}"
+---
+--- @param src string
+--- @param fromstr string
+--- @param tostr string
+--- @return string
+function vim.fn.tr(src, fromstr, tostr) end
+
+--- Return {text} as a String where any character in {mask} is
+--- removed from the beginning and/or end of {text}.
+---
+--- If {mask} is not given, or is an empty string, {mask} is all
+--- characters up to 0x20, which includes Tab, space, NL and CR,
+--- plus the non-breaking space character 0xa0.
+---
+--- The optional {dir} argument specifies where to remove the
+--- characters:
+---   0  remove from the beginning and end of {text}
+---   1  remove only at the beginning of {text}
+---   2  remove only at the end of {text}
+--- When omitted both ends are trimmed.
+---
+--- This function deals with multibyte characters properly.
+--- Returns an empty string on error.
+---
+--- Examples: >vim
+---   echo trim("   some text ")
+--- <returns "some text" >vim
+---   echo trim("  \r\t\t\r RESERVE \t\n\x0B\xA0") .. "_TAIL"
+--- <returns "RESERVE_TAIL" >vim
+---   echo trim("rm<Xrm<>X>rrm", "rm<>")
+--- <returns "Xrm<>X" (characters in the middle are not removed) >vim
+---   echo trim("  vim  ", " ", 2)
+--- <returns "  vim"
+---
+--- @param text any
+--- @param mask? string
+--- @param dir? 0|1|2
+--- @return string
+function vim.fn.trim(text, mask, dir) end
+
+--- Return the largest integral value with magnitude less than or
+--- equal to {expr} as a |Float| (truncate towards zero).
+--- {expr} must evaluate to a |Float| or a |Number|.
+--- Returns 0.0 if {expr} is not a |Float| or a |Number|.
+--- Examples: >vim
+---   echo trunc(1.456)
+--- <  1.0  >vim
+---   echo trunc(-5.456)
+--- <  -5.0  >vim
+---   echo trunc(4.0)
+--- <  4.0
+---
+--- @param expr any
+--- @return integer
+function vim.fn.trunc(expr) end
+
+--- The result is a Number representing the type of {expr}.
+--- Instead of using the number directly, it is better to use the
+--- v:t_ variable that has the value:
+---   Number:      0  |v:t_number|
+---   String:      1  |v:t_string|
+---   Funcref:    2  |v:t_func|
+---   List:      3  |v:t_list|
+---   Dictionary: 4  |v:t_dict|
+---   Float:      5  |v:t_float|
+---   Boolean:    6  |v:t_bool| (|v:false| and |v:true|)
+---   Null:      7  (|v:null|)
+---   Blob:     10  |v:t_blob|
+--- For backward compatibility, this method can be used: >vim
+---   if type(myvar) == type(0) | endif
+---   if type(myvar) == type("") | endif
+---   if type(myvar) == type(function("tr")) | endif
+---   if type(myvar) == type([]) | endif
+---   if type(myvar) == type({}) | endif
+---   if type(myvar) == type(0.0) | endif
+---   if type(myvar) == type(v:true) | endif
+--- <In place of checking for |v:null| type it is better to check
+--- for |v:null| directly as it is the only value of this type: >vim
+---   if myvar is v:null | endif
+--- <To check if the v:t_ variables exist use this: >vim
+---   if exists('v:t_number') | endif
+---
+--- @param expr any
+--- @return integer
+function vim.fn.type(expr) end
+
+--- Return the name of the undo file that would be used for a file
+--- with name {name} when writing.  This uses the 'undodir'
+--- option, finding directories that exist.  It does not check if
+--- the undo file exists.
+--- {name} is always expanded to the full path, since that is what
+--- is used internally.
+--- If {name} is empty undofile() returns an empty string, since a
+--- buffer without a file name will not write an undo file.
+--- Useful in combination with |:wundo| and |:rundo|.
+---
+--- @param name string
+--- @return string
+function vim.fn.undofile(name) end
+
+--- Return the current state of the undo tree for the current
+--- buffer, or for a specific buffer if {buf} is given.  The
+--- result is a dictionary with the following items:
+---   "seq_last"  The highest undo sequence number used.
+---   "seq_cur"  The sequence number of the current position in
+---     the undo tree.  This differs from "seq_last"
+---     when some changes were undone.
+---   "time_cur"  Time last used for |:earlier| and related
+---     commands.  Use |strftime()| to convert to
+---     something readable.
+---   "save_last"  Number of the last file write.  Zero when no
+---     write yet.
+---   "save_cur"  Number of the current position in the undo
+---     tree.
+---   "synced"  Non-zero when the last undo block was synced.
+---     This happens when waiting from input from the
+---     user.  See |undo-blocks|.
+---   "entries"  A list of dictionaries with information about
+---     undo blocks.
+---
+--- The first item in the "entries" list is the oldest undo item.
+--- Each List item is a |Dictionary| with these items:
+---   "seq"    Undo sequence number.  Same as what appears in
+---     |:undolist|.
+---   "time"  Timestamp when the change happened.  Use
+---     |strftime()| to convert to something readable.
+---   "newhead"  Only appears in the item that is the last one
+---     that was added.  This marks the last change
+---     and where further changes will be added.
+---   "curhead"  Only appears in the item that is the last one
+---     that was undone.  This marks the current
+---     position in the undo tree, the block that will
+---     be used by a redo command.  When nothing was
+---     undone after the last change this item will
+---     not appear anywhere.
+---   "save"  Only appears on the last block before a file
+---     write.  The number is the write count.  The
+---     first write has number 1, the last one the
+---     "save_last" mentioned above.
+---   "alt"    Alternate entry.  This is again a List of undo
+---     blocks.  Each item may again have an "alt"
+---     item.
+---
+--- @param buf? integer|string
+--- @return any
+function vim.fn.undotree(buf) end
+
+--- Remove second and succeeding copies of repeated adjacent
+--- {list} items in-place.  Returns {list}.  If you want a list
+--- to remain unmodified make a copy first: >vim
+---   let newlist = uniq(copy(mylist))
+--- <The default compare function uses the string representation of
+--- each item.  For the use of {func} and {dict} see |sort()|.
+---
+--- Returns zero if {list} is not a |List|.
+---
+--- @param list any
+--- @param func? any
+--- @param dict? any
+--- @return any[]|0
+function vim.fn.uniq(list, func, dict) end
+
+--- Same as |charidx()| but returns the UTF-16 code unit index of
+--- the byte at {idx} in {string} (after converting it to UTF-16).
+---
+--- When {charidx} is present and TRUE, {idx} is used as the
+--- character index in the String {string} instead of as the byte
+--- index.
+--- An {idx} in the middle of a UTF-8 sequence is rounded
+--- downwards to the beginning of that sequence.
+---
+--- Returns -1 if the arguments are invalid or if there are less
+--- than {idx} bytes in {string}. If there are exactly {idx} bytes
+--- the length of the string in UTF-16 code units is returned.
+---
+--- See |byteidx()| and |byteidxcomp()| for getting the byte index
+--- from the UTF-16 index and |charidx()| for getting the
+--- character index from the UTF-16 index.
+--- Refer to |string-offset-encoding| for more information.
+--- Examples: >vim
+---   echo utf16idx('a😊😊', 3)  " returns 2
+---   echo utf16idx('a😊😊', 7)  " returns 4
+---   echo utf16idx('a😊😊', 1, 0, 1)  " returns 2
+---   echo utf16idx('a😊😊', 2, 0, 1)  " returns 4
+---   echo utf16idx('aą́c', 6)    " returns 2
+---   echo utf16idx('aą́c', 6, 1)  " returns 4
+---   echo utf16idx('a😊😊', 9)  " returns -1
+--- <
+---
+--- @param string string
+--- @param idx integer
+--- @param countcc? any
+--- @param charidx? any
+--- @return integer
+function vim.fn.utf16idx(string, idx, countcc, charidx) end
+
+--- Return a |List| with all the values of {dict}.  The |List| is
+--- in arbitrary order.  Also see |items()| and |keys()|.
+--- Returns zero if {dict} is not a |Dict|.
+---
+--- @param dict any
+--- @return any
+function vim.fn.values(dict) end
+
+--- The result is a Number, which is the screen column of the file
+--- position given with {expr}.  That is, the last screen position
+--- occupied by the character at that position, when the screen
+--- would be of unlimited width.  When there is a <Tab> at the
+--- position, the returned Number will be the column at the end of
+--- the <Tab>.  For example, for a <Tab> in column 1, with 'ts'
+--- set to 8, it returns 8. |conceal| is ignored.
+--- For the byte position use |col()|.
+---
+--- For the use of {expr} see |col()|.
+---
+--- When 'virtualedit' is used {expr} can be [lnum, col, off],
+--- where "off" is the offset in screen columns from the start of
+--- the character.  E.g., a position within a <Tab> or after the
+--- last character.  When "off" is omitted zero is used.  When
+--- Virtual editing is active in the current mode, a position
+--- beyond the end of the line can be returned.  Also see
+--- |'virtualedit'|
+---
+--- The accepted positions are:
+---     .      the cursor position
+---     $      the end of the cursor line (the result is the
+---       number of displayed characters in the cursor line
+---       plus one)
+---     'x      position of mark x (if the mark is not set, 0 is
+---       returned)
+---     v       In Visual mode: the start of the Visual area (the
+---       cursor is the end).  When not in Visual mode
+---       returns the cursor position.  Differs from |'<| in
+---       that it's updated right away.
+---
+--- If {list} is present and non-zero then virtcol() returns a
+--- List with the first and last screen position occupied by the
+--- character.
+---
+--- With the optional {winid} argument the values are obtained for
+--- that window instead of the current window.
+---
+--- Note that only marks in the current file can be used.
+--- Examples: >vim
+---   " With text "foo^Lbar" and cursor on the "^L":
+---
+---   echo virtcol(".")  " returns 5
+---   echo virtcol(".", 1)  " returns [4, 5]
+---   echo virtcol("$")  " returns 9
+---
+---   " With text "    there", with 't at 'h':
+---
+---   echo virtcol("'t")  " returns 6
+--- <The first column is 1.  0 or [0, 0] is returned for an error.
+--- A more advanced example that echoes the maximum length of
+--- all lines: >vim
+---     echo max(map(range(1, line('$')), "virtcol([v:val, '$'])"))
+---
+--- @param expr any
+--- @param list? any
+--- @param winid? integer
+--- @return any
+function vim.fn.virtcol(expr, list, winid) end
+
+--- The result is a Number, which is the byte index of the
+--- character in window {winid} at buffer line {lnum} and virtual
+--- column {col}.
+---
+--- If buffer line {lnum} is an empty line, 0 is returned.
+---
+--- If {col} is greater than the last virtual column in line
+--- {lnum}, then the byte index of the character at the last
+--- virtual column is returned.
+---
+--- For a multi-byte character, the column number of the first
+--- byte in the character is returned.
+---
+--- The {winid} argument can be the window number or the
+--- |window-ID|. If this is zero, then the current window is used.
+---
+--- Returns -1 if the window {winid} doesn't exist or the buffer
+--- line {lnum} or virtual column {col} is invalid.
+---
+--- See also |screenpos()|, |virtcol()| and |col()|.
+---
+--- @param winid integer
+--- @param lnum integer
+--- @param col integer
+--- @return any
+function vim.fn.virtcol2col(winid, lnum, col) end
+
+--- The result is a String, which describes the last Visual mode
+--- used in the current buffer.  Initially it returns an empty
+--- string, but once Visual mode has been used, it returns "v",
+--- "V", or "<CTRL-V>" (a single CTRL-V character) for
+--- character-wise, line-wise, or block-wise Visual mode
+--- respectively.
+--- Example: >vim
+---   exe "normal " .. visualmode()
+--- <This enters the same Visual mode as before.  It is also useful
+--- in scripts if you wish to act differently depending on the
+--- Visual mode that was used.
+--- If Visual mode is active, use |mode()| to get the Visual mode
+--- (e.g., in a |:vmap|).
+--- If {expr} is supplied and it evaluates to a non-zero Number or
+--- a non-empty String, then the Visual mode will be cleared and
+--- the old value is returned.  See |non-zero-arg|.
+---
+--- @param expr? any
+--- @return any
+function vim.fn.visualmode(expr) end
+
+--- Waits until {condition} evaluates to |TRUE|, where {condition}
+--- is a |Funcref| or |string| containing an expression.
+---
+--- {timeout} is the maximum waiting time in milliseconds, -1
+--- means forever.
+---
+--- Condition is evaluated on user events, internal events, and
+--- every {interval} milliseconds (default: 200).
+---
+--- Returns a status integer:
+---   0 if the condition was satisfied before timeout
+---   -1 if the timeout was exceeded
+---   -2 if the function was interrupted (by |CTRL-C|)
+---   -3 if an error occurred
+---
+--- @param timeout integer
+--- @param condition any
+--- @param interval? any
+--- @return any
+function vim.fn.wait(timeout, condition, interval) end
+
+--- Returns |TRUE| when the wildmenu is active and |FALSE|
+--- otherwise.  See 'wildmenu' and 'wildmode'.
+--- This can be used in mappings to handle the 'wildcharm' option
+--- gracefully. (Makes only sense with |mapmode-c| mappings).
+---
+--- For example to make <c-j> work like <down> in wildmode, use: >vim
+---     cnoremap <expr> <C-j> wildmenumode() ? "\<Down>\<Tab>" : "\<c-j>"
+--- <
+--- (Note, this needs the 'wildcharm' option set appropriately).
+---
+--- @return any
+function vim.fn.wildmenumode() end
+
+--- Like `execute()` but in the context of window {id}.
+--- The window will temporarily be made the current window,
+--- without triggering autocommands or changing directory.  When
+--- executing {command} autocommands will be triggered, this may
+--- have unexpected side effects.  Use `:noautocmd` if needed.
+--- Example: >vim
+---   call win_execute(winid, 'syntax enable')
+--- <Doing the same with `setwinvar()` would not trigger
+--- autocommands and not actually show syntax highlighting.
+---
+--- When window {id} does not exist then no error is given and
+--- an empty string is returned.
+---
+--- @param id any
+--- @param command any
+--- @param silent? boolean
+--- @return any
+function vim.fn.win_execute(id, command, silent) end
+
+--- Returns a |List| with |window-ID|s for windows that contain
+--- buffer {bufnr}.  When there is none the list is empty.
+---
+--- @param bufnr any
+--- @return integer[]
+function vim.fn.win_findbuf(bufnr) end
+
+--- Get the |window-ID| for the specified window.
+--- When {win} is missing use the current window.
+--- With {win} this is the window number.  The top window has
+--- number 1.
+--- Without {tab} use the current tab, otherwise the tab with
+--- number {tab}.  The first tab has number one.
+--- Return zero if the window cannot be found.
+---
+--- @param win? any
+--- @param tab? any
+--- @return integer
+function vim.fn.win_getid(win, tab) end
+
+--- Return the type of the window:
+---   "autocmd"  autocommand window. Temporary window
+---       used to execute autocommands.
+---   "command"  command-line window |cmdwin|
+---   (empty)    normal window
+---   "loclist"  |location-list-window|
+---   "popup"    floating window |api-floatwin|
+---   "preview"  preview window |preview-window|
+---   "quickfix"  |quickfix-window|
+---   "unknown"  window {nr} not found
+---
+--- When {nr} is omitted return the type of the current window.
+--- When {nr} is given return the type of this window by number or
+--- |window-ID|.
+---
+--- Also see the 'buftype' option.
+---
+--- @param nr? integer
+--- @return 'autocmd'|'command'|''|'loclist'|'popup'|'preview'|'quickfix'|'unknown'
+function vim.fn.win_gettype(nr) end
+
+--- Go to window with ID {expr}.  This may also change the current
+--- tabpage.
+--- Return TRUE if successful, FALSE if the window cannot be found.
+---
+--- @param expr any
+--- @return 0|1
+function vim.fn.win_gotoid(expr) end
+
+--- Return a list with the tab number and window number of window
+--- with ID {expr}: [tabnr, winnr].
+--- Return [0, 0] if the window cannot be found.
+---
+--- @param expr any
+--- @return any
+function vim.fn.win_id2tabwin(expr) end
+
+--- Return the window number of window with ID {expr}.
+--- Return 0 if the window cannot be found in the current tabpage.
+---
+--- @param expr any
+--- @return any
+function vim.fn.win_id2win(expr) end
+
+--- Move window {nr}'s vertical separator (i.e., the right border)
+--- by {offset} columns, as if being dragged by the mouse. {nr}
+--- can be a window number or |window-ID|. A positive {offset}
+--- moves right and a negative {offset} moves left. Moving a
+--- window's vertical separator will change the width of the
+--- window and the width of other windows adjacent to the vertical
+--- separator. The magnitude of movement may be smaller than
+--- specified (e.g., as a consequence of maintaining
+--- 'winminwidth'). Returns TRUE if the window can be found and
+--- FALSE otherwise.
+--- This will fail for the rightmost window and a full-width
+--- window, since it has no separator on the right.
+--- Only works for the current tab page. *E1308*
+---
+--- @param nr integer
+--- @param offset any
+--- @return any
+function vim.fn.win_move_separator(nr, offset) end
+
+--- Move window {nr}'s status line (i.e., the bottom border) by
+--- {offset} rows, as if being dragged by the mouse. {nr} can be a
+--- window number or |window-ID|. A positive {offset} moves down
+--- and a negative {offset} moves up. Moving a window's status
+--- line will change the height of the window and the height of
+--- other windows adjacent to the status line. The magnitude of
+--- movement may be smaller than specified (e.g., as a consequence
+--- of maintaining 'winminheight'). Returns TRUE if the window can
+--- be found and FALSE otherwise.
+--- Only works for the current tab page.
+---
+--- @param nr integer
+--- @param offset any
+--- @return any
+function vim.fn.win_move_statusline(nr, offset) end
+
+--- Return the screen position of window {nr} as a list with two
+--- numbers: [row, col].  The first window always has position
+--- [1, 1], unless there is a tabline, then it is [2, 1].
+--- {nr} can be the window number or the |window-ID|.  Use zero
+--- for the current window.
+--- Returns [0, 0] if the window cannot be found in the current
+--- tabpage.
+---
+--- @param nr integer
+--- @return any
+function vim.fn.win_screenpos(nr) end
+
+--- Move the window {nr} to a new split of the window {target}.
+--- This is similar to moving to {target}, creating a new window
+--- using |:split| but having the same contents as window {nr}, and
+--- then closing {nr}.
+---
+--- Both {nr} and {target} can be window numbers or |window-ID|s.
+--- Both must be in the current tab page.
+---
+--- Returns zero for success, non-zero for failure.
+---
+--- {options} is a |Dictionary| with the following optional entries:
+---   "vertical"  When TRUE, the split is created vertically,
+---     like with |:vsplit|.
+---   "rightbelow"  When TRUE, the split is made below or to the
+---     right (if vertical).  When FALSE, it is done
+---     above or to the left (if vertical).  When not
+---     present, the values of 'splitbelow' and
+---     'splitright' are used.
+---
+--- @param nr integer
+--- @param target any
+--- @param options? table
+--- @return any
+function vim.fn.win_splitmove(nr, target, options) end
+
+--- The result is a Number, which is the number of the buffer
+--- associated with window {nr}.  {nr} can be the window number or
+--- the |window-ID|.
+--- When {nr} is zero, the number of the buffer in the current
+--- window is returned.
+--- When window {nr} doesn't exist, -1 is returned.
+--- Example: >vim
+---   echo "The file in the current window is " .. bufname(winbufnr(0))
+--- <
+---
+--- @param nr integer
+--- @return integer
+function vim.fn.winbufnr(nr) end
+
+--- The result is a Number, which is the virtual column of the
+--- cursor in the window.  This is counting screen cells from the
+--- left side of the window.  The leftmost column is one.
+---
+--- @return integer
+function vim.fn.wincol() end
+
+--- The result is a String.  For MS-Windows it indicates the OS
+--- version.  E.g, Windows 10 is "10.0", Windows 8 is "6.2",
+--- Windows XP is "5.1".  For non-MS-Windows systems the result is
+--- an empty string.
+---
+--- @return string
+function vim.fn.windowsversion() end
+
+--- The result is a Number, which is the height of window {nr}.
+--- {nr} can be the window number or the |window-ID|.
+--- When {nr} is zero, the height of the current window is
+--- returned.  When window {nr} doesn't exist, -1 is returned.
+--- An existing window always has a height of zero or more.
+--- This excludes any window toolbar line.
+--- Examples: >vim
+---   echo "The current window has " .. winheight(0) .. " lines."
+---
+--- @param nr integer
+--- @return integer
+function vim.fn.winheight(nr) end
+
+--- The result is a nested List containing the layout of windows
+--- in a tabpage.
+---
+--- Without {tabnr} use the current tabpage, otherwise the tabpage
+--- with number {tabnr}. If the tabpage {tabnr} is not found,
+--- returns an empty list.
+---
+--- For a leaf window, it returns: >
+---   ["leaf", {winid}]
+--- <
+--- For horizontally split windows, which form a column, it
+--- returns: >
+---   ["col", [{nested list of windows}]]
+--- <For vertically split windows, which form a row, it returns: >
+---   ["row", [{nested list of windows}]]
+--- <
+--- Example: >vim
+---   " Only one window in the tab page
+---   echo winlayout()
+--- < >
+---   ['leaf', 1000]
+--- < >vim
+---   " Two horizontally split windows
+---   echo winlayout()
+--- < >
+---   ['col', [['leaf', 1000], ['leaf', 1001]]]
+--- < >vim
+---   " The second tab page, with three horizontally split
+---   " windows, with two vertically split windows in the
+---   " middle window
+---   echo winlayout(2)
+--- < >
+---   ['col', [['leaf', 1002], ['row', [['leaf', 1003],
+---           ['leaf', 1001]]], ['leaf', 1000]]]
+--- <
+---
+--- @param tabnr? integer
+--- @return any
+function vim.fn.winlayout(tabnr) end
+
+--- The result is a Number, which is the screen line of the cursor
+--- in the window.  This is counting screen lines from the top of
+--- the window.  The first line is one.
+--- If the cursor was moved the view on the file will be updated
+--- first, this may cause a scroll.
+---
+--- @return integer
+function vim.fn.winline() end
+
+--- The result is a Number, which is the number of the current
+--- window.  The top window has number 1.
+--- Returns zero for a popup window.
+---
+--- The optional argument {arg} supports the following values:
+---   $  the number of the last window (the window
+---     count).
+---   #  the number of the last accessed window (where
+---     |CTRL-W_p| goes to).  If there is no previous
+---     window or it is in another tab page 0 is
+---     returned.
+---   {N}j  the number of the Nth window below the
+---     current window (where |CTRL-W_j| goes to).
+---   {N}k  the number of the Nth window above the current
+---     window (where |CTRL-W_k| goes to).
+---   {N}h  the number of the Nth window left of the
+---     current window (where |CTRL-W_h| goes to).
+---   {N}l  the number of the Nth window right of the
+---     current window (where |CTRL-W_l| goes to).
+--- The number can be used with |CTRL-W_w| and ":wincmd w"
+--- |:wincmd|.
+--- When {arg} is invalid an error is given and zero is returned.
+--- Also see |tabpagewinnr()| and |win_getid()|.
+--- Examples: >vim
+---   let window_count = winnr('$')
+---   let prev_window = winnr('#')
+---   let wnum = winnr('3k')
+---
+--- @param arg? any
+--- @return any
+function vim.fn.winnr(arg) end
+
+--- Returns a sequence of |:resize| commands that should restore
+--- the current window sizes.  Only works properly when no windows
+--- are opened or closed and the current window and tab page is
+--- unchanged.
+--- Example: >vim
+---   let cmd = winrestcmd()
+---   call MessWithWindowSizes()
+---   exe cmd
+--- <
+---
+--- @return any
+function vim.fn.winrestcmd() end
+
+--- Uses the |Dictionary| returned by |winsaveview()| to restore
+--- the view of the current window.
+--- Note: The {dict} does not have to contain all values, that are
+--- returned by |winsaveview()|. If values are missing, those
+--- settings won't be restored. So you can use: >vim
+---     call winrestview({'curswant': 4})
+--- <
+--- This will only set the curswant value (the column the cursor
+--- wants to move on vertical movements) of the cursor to column 5
+--- (yes, that is 5), while all other settings will remain the
+--- same. This is useful, if you set the cursor position manually.
+---
+--- If you have changed the values the result is unpredictable.
+--- If the window size changed the result won't be the same.
+---
+--- @param dict vim.fn.winrestview.dict
+--- @return any
+function vim.fn.winrestview(dict) end
+
+--- Returns a |Dictionary| that contains information to restore
+--- the view of the current window.  Use |winrestview()| to
+--- restore the view.
+--- This is useful if you have a mapping that jumps around in the
+--- buffer and you want to go back to the original view.
+--- This does not save fold information.  Use the 'foldenable'
+--- option to temporarily switch off folding, so that folds are
+--- not opened when moving around. This may have side effects.
+--- The return value includes:
+---   lnum    cursor line number
+---   col    cursor column (Note: the first column
+---       zero, as opposed to what |getcurpos()|
+---       returns)
+---   coladd    cursor column offset for 'virtualedit'
+---   curswant  column for vertical movement (Note:
+---       the first column is zero, as opposed
+---       to what |getcurpos()| returns).  After
+---       |$| command it will be a very large
+---       number equal to |v:maxcol|.
+---   topline    first line in the window
+---   topfill    filler lines, only in diff mode
+---   leftcol    first column displayed; only used when
+---       'wrap' is off
+---   skipcol    columns skipped
+--- Note that no option values are saved.
+---
+--- @return vim.fn.winsaveview.ret
+function vim.fn.winsaveview() end
+
+--- The result is a Number, which is the width of window {nr}.
+--- {nr} can be the window number or the |window-ID|.
+--- When {nr} is zero, the width of the current window is
+--- returned.  When window {nr} doesn't exist, -1 is returned.
+--- An existing window always has a width of zero or more.
+--- Examples: >vim
+---   echo "The current window has " .. winwidth(0) .. " columns."
+---   if winwidth(0) <= 50
+---     50 wincmd |
+---   endif
+--- <For getting the terminal or screen size, see the 'columns'
+--- option.
+---
+--- @param nr integer
+--- @return any
+function vim.fn.winwidth(nr) end
+
+--- The result is a dictionary of byte/chars/word statistics for
+--- the current buffer.  This is the same info as provided by
+--- |g_CTRL-G|
+--- The return value includes:
+---   bytes    Number of bytes in the buffer
+---   chars    Number of chars in the buffer
+---   words    Number of words in the buffer
+---   cursor_bytes    Number of bytes before cursor position
+---       (not in Visual mode)
+---   cursor_chars    Number of chars before cursor position
+---       (not in Visual mode)
+---   cursor_words    Number of words before cursor position
+---       (not in Visual mode)
+---   visual_bytes    Number of bytes visually selected
+---       (only in Visual mode)
+---   visual_chars    Number of chars visually selected
+---       (only in Visual mode)
+---   visual_words    Number of words visually selected
+---       (only in Visual mode)
+---
+--- @return any
+function vim.fn.wordcount() end
+
+--- When {object} is a |List| write it to file {fname}.  Each list
+--- item is separated with a NL.  Each list item must be a String
+--- or Number.
+--- All NL characters are replaced with a NUL character.
+--- Inserting CR characters needs to be done before passing {list}
+--- to writefile().
+---
+--- When {object} is a |Blob| write the bytes to file {fname}
+--- unmodified, also when binary mode is not specified.
+---
+--- {flags} must be a String.  These characters are recognized:
+---
+--- 'b'  Binary mode is used: There will not be a NL after the
+---      last list item.  An empty item at the end does cause the
+---      last line in the file to end in a NL.
+---
+--- 'a'  Append mode is used, lines are appended to the file: >vim
+---   call writefile(["foo"], "event.log", "a")
+---   call writefile(["bar"], "event.log", "a")
+--- <
+--- 'D'  Delete the file when the current function ends.  This
+---      works like: >vim
+---   defer delete({fname})
+--- <     Fails when not in a function.  Also see |:defer|.
+---
+--- 's'  fsync() is called after writing the file.  This flushes
+---      the file to disk, if possible.  This takes more time but
+---      avoids losing the file if the system crashes.
+---
+--- 'S'  fsync() is not called, even when 'fsync' is set.
+---
+---      When {flags} does not contain "S" or "s" then fsync() is
+---      called if the 'fsync' option is set.
+---
+--- An existing file is overwritten, if possible.
+---
+--- When the write fails -1 is returned, otherwise 0.  There is an
+--- error message if the file can't be created or when writing
+--- fails.
+---
+--- Also see |readfile()|.
+--- To copy a file byte for byte: >vim
+---   let fl = readfile("foo", "b")
+---   call writefile(fl, "foocopy", "b")
+---
+--- @param object any
+--- @param fname string
+--- @param flags? string
+--- @return any
+function vim.fn.writefile(object, fname, flags) end
+
+--- Bitwise XOR on the two arguments.  The arguments are converted
+--- to a number.  A List, Dict or Float argument causes an error.
+--- Also see `and()` and `or()`.
+--- Example: >vim
+---   let bits = xor(bits, 0x80)
+--- <
+---
+--- @param expr any
+--- @param expr1 any
+--- @return any
+function vim.fn.xor(expr, expr1) end