api: consistently use nvim_ prefix and update documentation

20 files changed, 492 insertions, 348 deletions

diff --git a/runtime/doc/api.txt b/runtime/doc/api.txt
index bdeca367b1..c3d7fdb35b 100644
--- a/runtime/doc/api.txt
+++ b/runtime/doc/api.txt
@@ -14,13 +14,13 @@ C API for Nvim							   *API* *api*
 ==============================================================================
 1. Introduction							   *api-intro*
 
-Nvim exposes a public API for external code to interact with the Nvim core. In
-the present version of Nvim the API is primarily used by external processes to
-interact with Nvim using the msgpack-rpc protocol, see |msgpack-rpc|. The API
-will also be used from vimscript to access new Nvim core features, but this is
-not implemented yet. Later on, Nvim might be embeddable in C applications as
-libnvim, and the application will then control the embedded instance by
-calling the C API directly.
+Nvim exposes a public API for external code to interact with the Nvim core.
+The API is used by external processes to interact with Nvim using the
+msgpack-rpc protocol, see |msgpack-rpc|. The API is used from vimscript to
+access some new Nvim core features. See |eval-api| for how api functions are
+called from vimscript. Later on, Nvim might be embeddable in C applications as
+libnvim, and the application will then control the embedded instance by calling
+the C API directly.
 
 ==============================================================================
 2. API Types							   *api-types*
@@ -73,10 +73,10 @@ Another use case are plugins that show output in an append-only buffer, and
 want to add highlights to the outputs. Highlight data cannot be preserved
 on writing and loading a buffer to file, nor in undo/redo cycles.
 
-Highlights are registered using the |buffer_add_highlight| function, see the
+Highlights are registered using the |nvim_buf_add_highlight| function, see the
 generated API documentation for details. If an external highlighter plugin is
 adding a large number of highlights in a batch, performance can be improved by
-calling |buffer_add_highlight| as an asynchronous notification, after first
+calling |nvim_buf_add_highlight| as an asynchronous notification, after first
 (synchronously) reqesting a source id. Here is an example using wrapper
 functions in the python client:
 >
@@ -91,10 +91,19 @@ functions in the python client:
     buf.clear_highlight(src)
 <
 If the highlights don't need to be deleted or updated, just pass -1 as
-src_id (this is the default in python). |buffer_clear_highlight| can be used
-to clear highligts from a specific source, in a specific line range or the
-entire buffer by passing in the line range 0, -1 (the later is the default
+src_id (this is the default in python). |nvim_buf_clear_highlight| can be used
+to clear highlights from a specific source, in a specific line range or the
+entire buffer by passing in the line range 0, -1 (the latter is the default
 in python as used above).
 
+An example of calling the api from vimscript: >
+
+    call nvim_buf_set_lines(0, 0, 0, v:true, ["test text"])
+    let src = nvim_buf_add_highlight(0, 0, "String", 1, 0, 4)
+    call nvim_buf_add_highlight(0, src, "Identifier", 0, 5, -1)
+
+    " later
+    call nvim_buf_clear_highlight(0, src, 0, -1)
+>
 ==============================================================================
  vim:tw=78:ts=8:noet:ft=help:norl:
diff --git a/runtime/doc/eval.txt b/runtime/doc/eval.txt
index 03d8f84aa6..92f9a0f656 100644
--- a/runtime/doc/eval.txt
+++ b/runtime/doc/eval.txt
@@ -2009,6 +2009,7 @@ msgpackdump({list})		List	dump a list of objects to msgpack
 msgpackparse({list})		List	parse msgpack to a list of objects
 nextnonblank({lnum})		Number	line nr of non-blank line >= {lnum}
 nr2char({expr}[, {utf8}])	String	single char with ASCII/UTF8 value {expr}
+nvim_...({args}...)		any	call nvim |api| functions
 or({expr}, {expr})		Number  bitwise OR
 pathshorten({expr})		String	shorten directory names in a path
 pow({x}, {y})			Float	{x} to the power of {y}
@@ -2208,11 +2209,9 @@ and({expr}, {expr})					*and()*
 		Example: >
 			:let flag = and(bits, 0x80)
 
-
 api_info()						*api_info()*
 		Returns Dictionary of |api-metadata|.
 
-
 append({lnum}, {expr})					*append()*
 		When {expr} is a |List|: Append each item of the |List| as a
 		text line below line {lnum} in the current buffer.
@@ -5172,6 +5171,17 @@ nr2char({expr}[, {utf8}])				*nr2char()*
 		characters.  nr2char(0) is a real NUL and terminates the
 		string, thus results in an empty string.
 
+nvim_...({...})						*nvim_...()* *eval-api*
+		Call nvim |api| functions. The type checking of arguments will
+		be stricter than for most other builtins. For instance,
+		if Integer is expected, a |Number| must be passed in, a
+		|String| will not be autoconverted.
+		Buffer numbers, as returned by |bufnr()| could be used as
+		first argument to nvim_buf_... functions.  All functions
+		expecting an object (buffer, window or tabpage) can
+		also take the numerical value 0 to indicate the current
+		(focused) object.
+
 or({expr}, {expr})					*or()*
 		Bitwise OR on the two arguments.  The arguments are converted
 		to a number.  A List, Dict or Float argument causes an error.
diff --git a/runtime/doc/msgpack_rpc.txt b/runtime/doc/msgpack_rpc.txt
index 30f68ca942..59e9e44f8f 100644
--- a/runtime/doc/msgpack_rpc.txt
+++ b/runtime/doc/msgpack_rpc.txt
@@ -47,7 +47,7 @@ instance.
 
 There are three ways to obtain API metadata:
 
-  1. Connect to a running Nvim instance and call `vim_get_api_info` via
+  1. Connect to a running Nvim instance and call `nvim_get_api_info` via
      msgpack-rpc. This is best for clients written in dynamic languages which
      can define functions at runtime.
 
@@ -105,7 +105,7 @@ Nvim instance:
     require 'msgpack/rpc/transport/unix'
 
     nvim = MessagePack::RPC::Client.new(MessagePack::RPC::UNIXTransport.new, ENV['NVIM_LISTEN_ADDRESS'])
-    result = nvim.call(:vim_command, 'echo "hello world!"')
+    result = nvim.call(:nvim_command, 'echo "hello world!"')
 <
 A better way is to use the Python REPL with the `neovim` package, where API
 functions can be called interactively:
@@ -117,9 +117,9 @@ functions can be called interactively:
 You can also embed an Nvim instance via |jobstart()|, and communicate using
 |rpcrequest()| and |rpcnotify()|:
 >
-    let vim = jobstart(['nvim', '--embed'], {'rpc': v:true})
-    echo rpcrequest(vim, 'vim_eval', '"Hello " . "world!"')
-    call jobstop(vim)
+    let nvim = jobstart(['nvim', '--embed'], {'rpc': v:true})
+    echo rpcrequest(nvim, 'nvim_eval', '"Hello " . "world!"')
+    call jobstop(nvim)
 <
 ==============================================================================
 4. Implementing API clients			*rpc-api-client* *api-client*
@@ -177,15 +177,20 @@ contains information that makes this task easier (see also |rpc-types|):
   - Container types may be decorated with type/size constraints, e.g.
     ArrayOf(Buffer) or ArrayOf(Integer, 2). This can be useful to generate
     even more strongly-typed APIs.
-  - Methods that operate on instances of Nvim special types (msgpack EXT) are
-    prefixed with the type name in lower case, e.g. `buffer_get_line`
-    represents the `get_line` method of a Buffer instance.
-  - Global methods are prefixed with `vim`, e.g. `vim_get_buffers`.
+  - Functions that are considered to be methods that operate on instances of
+    Nvim special types (msgpack EXT) will have the `"method"` attribute set to
+    `true`. The reciever type is the type of the first argument. The method
+    names are prefixed with `nvim_` plus a shortened type name, e.g.
+    `nvim_buf_get_lines` represents the `get_lines` method of a Buffer instance.
+    - Global functions have `"method"` set to `false` and are prefixed with just
+    `nvim_`, e.g. `nvim_get_buffers`.
 
 So for an object-oriented language, an API client contains the classes
 representing Nvim special types, and the methods of each class could be
-defined by inspecting the method name prefix. There could also be a singleton
-Vim class with methods mapped to functions prefixed with `vim_`.
+defined by stripping the prefix for the type as defined in the `types` metadata
+(this will always be the first two "_"-separated parts of the function name).
+There could also be a singleton Vim class with methods where the `nvim_`
+prefix is stripped off.
 
 ==============================================================================
 5. Types							    *rpc-types*
@@ -219,18 +224,21 @@ an integer, but not a Window or Tabpage.
 
 The most reliable way of determining the type codes for the special Nvim types
 is to inspect the `types` key of metadata dictionary returned by the
-`vim_get_api_info` method at runtime. Here's a sample JSON representation of
+`nvim_get_api_info` method at runtime. Here's a sample JSON representation of
 the `types` object:
 >
   "types": {
     "Buffer": {
-      "id": 0
+      "id": 0,
+      "prefix": "nvim_buf_"
     },
     "Window": {
-      "id": 1
+      "id": 1,
+      "prefix": "nvim_win_"
     },
     "Tabpage": {
-      "id": 2
+      "id": 2,
+      "prefix": "nvim_tabpage_"
     }
   }
 <
diff --git a/scripts/dispatch_deprecated.lua b/scripts/dispatch_deprecated.lua
new file mode 100644
index 0000000000..f3b299e3fc
--- /dev/null
+++ b/scripts/dispatch_deprecated.lua
@@ -0,0 +1,77 @@
+local deprecated_aliases = {
+  nvim_buf_line_count="buffer_line_count",
+  nvim_buf_get_lines="buffer_get_lines",
+  nvim_buf_set_lines="buffer_set_lines",
+  nvim_buf_get_var="buffer_get_var",
+  nvim_buf_set_var="buffer_set_var",
+  nvim_buf_del_var="buffer_del_var",
+  nvim_buf_get_option="buffer_get_option",
+  nvim_buf_set_option="buffer_set_option",
+  nvim_buf_get_number="buffer_get_number",
+  nvim_buf_get_name="buffer_get_name",
+  nvim_buf_set_name="buffer_set_name",
+  nvim_buf_is_valid="buffer_is_valid",
+  nvim_buf_get_mark="buffer_get_mark",
+  nvim_buf_add_highlight="buffer_add_highlight",
+  nvim_buf_clear_highlight="buffer_clear_highlight",
+  nvim_tabpage_get_windows="tabpage_get_windows",
+  nvim_tabpage_get_var="tabpage_get_var",
+  nvim_tabpage_set_var="tabpage_set_var",
+  nvim_tabpage_del_var="tabpage_del_var",
+  nvim_tabpage_get_window="tabpage_get_window",
+  nvim_tabpage_is_valid="tabpage_is_valid",
+  nvim_ui_detach="ui_detach",
+  nvim_ui_try_resize="ui_try_resize",
+  nvim_command="vim_command",
+  nvim_feedkeys="vim_feedkeys",
+  nvim_input="vim_input",
+  nvim_replace_termcodes="vim_replace_termcodes",
+  nvim_command_output="vim_command_output",
+  nvim_eval="vim_eval",
+  nvim_call_function="vim_call_function",
+  nvim_strwidth="vim_strwidth",
+  nvim_list_runtime_paths="vim_list_runtime_paths",
+  nvim_change_directory="vim_change_directory",
+  nvim_get_var="vim_get_var",
+  nvim_set_var="vim_set_var",
+  nvim_del_var="vim_del_var",
+  nvim_get_vvar="vim_get_vvar",
+  nvim_get_option="vim_get_option",
+  nvim_set_option="vim_set_option",
+  nvim_out_write="vim_out_write",
+  nvim_err_write="vim_err_write",
+  nvim_report_error="vim_report_error",
+  nvim_get_buffers="vim_get_buffers",
+  nvim_get_current_buffer="vim_get_current_buffer",
+  nvim_set_current_buffer="vim_set_current_buffer",
+  nvim_get_windows="vim_get_windows",
+  nvim_get_current_window="vim_get_current_window",
+  nvim_set_current_window="vim_set_current_window",
+  nvim_get_tabpages="vim_get_tabpages",
+  nvim_get_current_tabpage="vim_get_current_tabpage",
+  nvim_set_current_tabpage="vim_set_current_tabpage",
+  nvim_set_current_line="vim_set_current_line",
+  nvim_get_current_line="vim_get_current_line",
+  nvim_del_current_line="vim_del_current_line",
+  nvim_subscribe="vim_subscribe",
+  nvim_unsubscribe="vim_unsubscribe",
+  nvim_name_to_color="vim_name_to_color",
+  nvim_get_color_map="vim_get_color_map",
+  nvim_get_api_info="vim_get_api_info",
+  nvim_win_get_buffer="window_get_buffer",
+  nvim_win_get_cursor="window_get_cursor",
+  nvim_win_set_cursor="window_set_cursor",
+  nvim_win_get_height="window_get_height",
+  nvim_win_set_height="window_set_height",
+  nvim_win_get_width="window_get_width",
+  nvim_win_set_width="window_set_width",
+  nvim_win_get_var="window_get_var",
+  nvim_win_set_var="window_set_var",
+  nvim_win_del_var="window_del_var",
+  nvim_win_get_option="window_get_option",
+  nvim_win_set_option="window_set_option",
+  nvim_win_get_position="window_get_position",
+  nvim_win_get_tabpage="window_get_tabpage",
+  nvim_win_is_valid="window_is_valid"
+}
+return deprecated_aliases
diff --git a/scripts/gendispatch.lua b/scripts/gendispatch.lua
index 68d4d44e2d..2846aece5d 100644
--- a/scripts/gendispatch.lua
+++ b/scripts/gendispatch.lua
@@ -42,10 +42,13 @@ c_proto = Ct(
   )
 grammar = Ct((c_proto + c_comment + c_preproc + ws) ^ 1)
 
--- we need at least 3 arguments since the last two are output files
-assert(#arg >= 2)
+-- we need at least 4 arguments since the last two are output files
+assert(#arg >= 3)
 functions = {}
 
+local scriptdir = arg[1]
+package.path = scriptdir .. '/?.lua;' .. package.path
+
 -- names of all headers relative to the source root (for inclusion in the
 -- generated file)
 headers = {}
@@ -55,7 +58,7 @@ outputf = arg[#arg-1]
 mpack_outputf = arg[#arg]
 
 -- read each input file, parse and append to the api metadata
-for i = 1, #arg - 2 do
+for i = 2, #arg - 2 do
   local full_path = arg[i]
   local parts = {}
   for part in string.gmatch(full_path, '[^/]+') do
@@ -87,6 +90,45 @@ for i = 1, #arg - 2 do
   input:close()
 end
 
+local function shallowcopy(orig)
+  local copy = {}
+  for orig_key, orig_value in pairs(orig) do
+    copy[orig_key] = orig_value
+  end
+  return copy
+end
+
+local function startswith(String,Start)
+  return string.sub(String,1,string.len(Start))==Start
+end
+
+-- Export functions under older deprecated names.
+-- These will be removed eventually.
+local deprecated_aliases = require("dispatch_deprecated")
+for i,f in ipairs(shallowcopy(functions)) do
+  local ismethod = false
+  if startswith(f.name, "nvim_buf_") then
+    ismethod = true
+  elseif startswith(f.name, "nvim_win_") then
+    ismethod = true
+  elseif startswith(f.name, "nvim_tabpage_") then
+    ismethod = true
+  elseif not startswith(f.name, "nvim_") then
+    f.noeval = true
+    f.deprecated_since = 1
+  end
+  f.method = ismethod
+  local newname = deprecated_aliases[f.name]
+  if newname ~= nil then
+    local newf = shallowcopy(f)
+    newf.name = newname
+    newf.impl_name = f.name
+    newf.noeval = true
+    newf.deprecated_since = 1
+    functions[#functions+1] = newf
+  end
+end
+
 
 -- start building the output
 output = io.open(outputf, 'wb')
@@ -166,99 +208,101 @@ end
 -- the real API.
 for i = 1, #functions do
   local fn = functions[i]
-  local args = {}
-
-  output:write('Object handle_'..fn.name..'(uint64_t channel_id, uint64_t request_id, Array args, Error *error)')
-  output:write('\n{')
-  output:write('\n  Object ret = NIL;')
-  -- Declare/initialize variables that will hold converted arguments
-  for j = 1, #fn.parameters do
-    local param = fn.parameters[j]
-    local converted = 'arg_'..j
-    output:write('\n  '..param[1]..' '..converted..' api_init_'..string.lower(real_type(param[1]))..';')
-  end
-  output:write('\n')
-  output:write('\n  if (args.size != '..#fn.parameters..') {')
-  output:write('\n    snprintf(error->msg, sizeof(error->msg), "Wrong number of arguments: expecting '..#fn.parameters..' but got %zu", args.size);')
-  output:write('\n    error->set = true;')
-  output:write('\n    goto cleanup;')
-  output:write('\n  }\n')
-
-  -- Validation/conversion for each argument
-  for j = 1, #fn.parameters do
-    local converted, convert_arg, param, arg
-    param = fn.parameters[j]
-    converted = 'arg_'..j
-    local rt = real_type(param[1])
-    if rt ~= 'Object' then
-      output:write('\n  if (args.items['..(j - 1)..'].type == kObjectType'..rt..') {')
-      output:write('\n    '..converted..' = args.items['..(j - 1)..'].data.'..rt:lower()..';')
-      if rt:match('^Buffer$') or rt:match('^Window$') or rt:match('^Tabpage$') or rt:match('^Boolean$') then
-        -- accept nonnegative integers for Booleans, Buffers, Windows and Tabpages
-        output:write('\n  } else if (args.items['..(j - 1)..'].type == kObjectTypeInteger && args.items['..(j - 1)..'].data.integer >= 0) {')
-        output:write('\n    '..converted..' = (handle_T)args.items['..(j - 1)..'].data.integer;')
-      end
-      output:write('\n  } else {')
-      output:write('\n    snprintf(error->msg, sizeof(error->msg), "Wrong type for argument '..j..', expecting '..param[1]..'");')
-      output:write('\n    error->set = true;')
-      output:write('\n    goto cleanup;')
-      output:write('\n  }\n')
-    else
-      output:write('\n  '..converted..' = args.items['..(j - 1)..'];\n')
+  if fn.impl_name == nil then
+    local args = {}
+
+    output:write('Object handle_'..fn.name..'(uint64_t channel_id, uint64_t request_id, Array args, Error *error)')
+    output:write('\n{')
+    output:write('\n  Object ret = NIL;')
+    -- Declare/initialize variables that will hold converted arguments
+    for j = 1, #fn.parameters do
+      local param = fn.parameters[j]
+      local converted = 'arg_'..j
+      output:write('\n  '..param[1]..' '..converted..' api_init_'..string.lower(real_type(param[1]))..';')
     end
+    output:write('\n')
+    output:write('\n  if (args.size != '..#fn.parameters..') {')
+    output:write('\n    snprintf(error->msg, sizeof(error->msg), "Wrong number of arguments: expecting '..#fn.parameters..' but got %zu", args.size);')
+    output:write('\n    error->set = true;')
+    output:write('\n    goto cleanup;')
+    output:write('\n  }\n')
 
-    args[#args + 1] = converted
-  end
+    -- Validation/conversion for each argument
+    for j = 1, #fn.parameters do
+      local converted, convert_arg, param, arg
+      param = fn.parameters[j]
+      converted = 'arg_'..j
+      local rt = real_type(param[1])
+      if rt ~= 'Object' then
+        output:write('\n  if (args.items['..(j - 1)..'].type == kObjectType'..rt..') {')
+        output:write('\n    '..converted..' = args.items['..(j - 1)..'].data.'..rt:lower()..';')
+        if rt:match('^Buffer$') or rt:match('^Window$') or rt:match('^Tabpage$') or rt:match('^Boolean$') then
+          -- accept nonnegative integers for Booleans, Buffers, Windows and Tabpages
+          output:write('\n  } else if (args.items['..(j - 1)..'].type == kObjectTypeInteger && args.items['..(j - 1)..'].data.integer >= 0) {')
+          output:write('\n    '..converted..' = (handle_T)args.items['..(j - 1)..'].data.integer;')
+        end
+        output:write('\n  } else {')
+        output:write('\n    snprintf(error->msg, sizeof(error->msg), "Wrong type for argument '..j..', expecting '..param[1]..'");')
+        output:write('\n    error->set = true;')
+        output:write('\n    goto cleanup;')
+        output:write('\n  }\n')
+      else
+        output:write('\n  '..converted..' = args.items['..(j - 1)..'];\n')
+      end
 
-  -- function call
-  local call_args = table.concat(args, ', ')
-  output:write('\n  ')
-  if fn.return_type ~= 'void' then
-    -- has a return value, prefix the call with a declaration
-    output:write(fn.return_type..' rv = ')
-  end
+      args[#args + 1] = converted
+    end
 
-  -- write the function name and the opening parenthesis
-  output:write(fn.name..'(')
+    -- function call
+    local call_args = table.concat(args, ', ')
+    output:write('\n  ')
+    if fn.return_type ~= 'void' then
+      -- has a return value, prefix the call with a declaration
+      output:write(fn.return_type..' rv = ')
+    end
 
-  if fn.receives_channel_id then
-    -- if the function receives the channel id, pass it as first argument
-    if #args > 0 or fn.can_fail then
-      output:write('channel_id, '..call_args)
+    -- write the function name and the opening parenthesis
+    output:write(fn.name..'(')
+
+    if fn.receives_channel_id then
+      -- if the function receives the channel id, pass it as first argument
+      if #args > 0 or fn.can_fail then
+        output:write('channel_id, '..call_args)
+      else
+        output:write('channel_id')
+      end
     else
-      output:write('channel_id')
+      output:write(call_args)
     end
-  else
-    output:write(call_args)
-  end
 
-  if fn.can_fail then
-    -- if the function can fail, also pass a pointer to the local error object
-    if #args > 0 then
-      output:write(', error);\n')
+    if fn.can_fail then
+      -- if the function can fail, also pass a pointer to the local error object
+      if #args > 0 then
+        output:write(', error);\n')
+      else
+        output:write('error);\n')
+      end
+      -- and check for the error
+      output:write('\n  if (error->set) {')
+      output:write('\n    goto cleanup;')
+      output:write('\n  }\n')
     else
-      output:write('error);\n')
+      output:write(');\n')
     end
-    -- and check for the error
-    output:write('\n  if (error->set) {')
-    output:write('\n    goto cleanup;')
-    output:write('\n  }\n')
-  else
-    output:write(');\n')
-  end
 
-  if fn.return_type ~= 'void' then
-    output:write('\n  ret = '..string.upper(real_type(fn.return_type))..'_OBJ(rv);')
-  end
-  -- Now generate the cleanup label for freeing memory allocated for the
-  -- arguments
-  output:write('\n\ncleanup:');
+    if fn.return_type ~= 'void' then
+      output:write('\n  ret = '..string.upper(real_type(fn.return_type))..'_OBJ(rv);')
+    end
+    -- Now generate the cleanup label for freeing memory allocated for the
+    -- arguments
+    output:write('\n\ncleanup:');
 
-  for j = 1, #fn.parameters do
-    local param = fn.parameters[j]
-    output:write('\n  api_free_'..string.lower(real_type(param[1]))..'(arg_'..j..');')
+    for j = 1, #fn.parameters do
+      local param = fn.parameters[j]
+      output:write('\n  api_free_'..string.lower(real_type(param[1]))..'(arg_'..j..');')
+    end
+    output:write('\n  return ret;\n}\n\n');
   end
-  output:write('\n  return ret;\n}\n\n');
 end
 
 -- Generate a function that initializes method names with handler functions
@@ -284,7 +328,7 @@ for i = 1, #functions do
   output:write('  msgpack_rpc_add_method_handler('..
                '(String) {.data = "'..fn.name..'", '..
                '.size = sizeof("'..fn.name..'") - 1}, '..
-               '(MsgpackRpcRequestHandler) {.fn = handle_'..  fn.name..
+               '(MsgpackRpcRequestHandler) {.fn = handle_'..  (fn.impl_name or fn.name)..
                ', .async = '..tostring(fn.async)..'});\n')
 
   if #fn.name > max_fname_len then
diff --git a/scripts/geneval.lua b/scripts/geneval.lua
index a6171f0993..b1ba76296c 100644
--- a/scripts/geneval.lua
+++ b/scripts/geneval.lua
@@ -26,7 +26,7 @@ local funcs = require('eval').funcs
 local metadata = mpack.unpack(io.open(arg[3], 'rb'):read("*all"))
 for i,fun in ipairs(metadata) do
   if not fun.noeval then
-    funcs['api_'..fun.name] = {
+    funcs[fun.name] = {
       args=#fun.parameters,
       func='api_wrapper',
       data='&handle_'..fun.name,
diff --git a/src/nvim/CMakeLists.txt b/src/nvim/CMakeLists.txt
index e36bf400cc..3ae75c01c3 100644
--- a/src/nvim/CMakeLists.txt
+++ b/src/nvim/CMakeLists.txt
@@ -199,7 +199,7 @@ add_custom_command(OUTPUT ${GENERATED_UNICODE_TABLES}
 )
 
 add_custom_command(OUTPUT ${GENERATED_API_DISPATCH} ${API_METADATA}
-  COMMAND ${LUA_PRG} ${DISPATCH_GENERATOR} ${API_HEADERS} ${GENERATED_API_DISPATCH} ${API_METADATA}
+    COMMAND ${LUA_PRG} ${DISPATCH_GENERATOR} ${PROJECT_SOURCE_DIR}/scripts ${API_HEADERS} ${GENERATED_API_DISPATCH} ${API_METADATA}
   DEPENDS
     ${API_HEADERS}
     ${MSGPACK_RPC_HEADERS}
diff --git a/src/nvim/api/buffer.c b/src/nvim/api/buffer.c
index 89fb7feaa9..cf8d538f86 100644
--- a/src/nvim/api/buffer.c
+++ b/src/nvim/api/buffer.c
@@ -32,7 +32,7 @@
 /// @param buffer The buffer handle
 /// @param[out] err Details of an error that may have occurred
 /// @return The line count
-Integer buffer_line_count(Buffer buffer, Error *err)
+Integer nvim_buf_line_count(Buffer buffer, Error *err)
 {
   buf_T *buf = find_buffer_by_handle(buffer, err);
 
@@ -45,23 +45,22 @@ Integer buffer_line_count(Buffer buffer, Error *err)
 
 /// Gets a buffer line
 ///
-/// @deprecated use buffer_get_lines instead.
+/// @deprecated use nvim_buf_get_lines instead.
 ///             for positive indices (including 0) use
-///                 "buffer_get_lines(buffer, index, index+1, true)"
+///                 "nvim_buf_get_lines(buffer, index, index+1, true)"
 ///             for negative indices use
-///                 "buffer_get_lines(buffer, index-1, index, true)"
+///                 "nvim_buf_get_lines(buffer, index-1, index, true)"
 ///
 /// @param buffer The buffer handle
 /// @param index The line index
 /// @param[out] err Details of an error that may have occurred
 /// @return The line string
 String buffer_get_line(Buffer buffer, Integer index, Error *err)
-    FUNC_API_NOEVAL
 {
   String rv = { .size = 0 };
 
   index = convert_index(index);
-  Array slice = buffer_get_lines(0, buffer, index, index+1, true, err);
+  Array slice = nvim_buf_get_lines(0, buffer, index, index+1, true, err);
 
   if (!err->set && slice.size) {
     rv = slice.items[0].data.string;
@@ -74,46 +73,44 @@ String buffer_get_line(Buffer buffer, Integer index, Error *err)
 
 /// Sets a buffer line
 ///
-/// @deprecated use buffer_set_lines instead.
+/// @deprecated use nvim_buf_set_lines instead.
 ///             for positive indices use
-///                 "buffer_set_lines(buffer, index, index+1, true, [line])"
+///                 "nvim_buf_set_lines(buffer, index, index+1, true, [line])"
 ///             for negative indices use
-///                 "buffer_set_lines(buffer, index-1, index, true, [line])"
+///                 "nvim_buf_set_lines(buffer, index-1, index, true, [line])"
 ///
 /// @param buffer The buffer handle
 /// @param index The line index
 /// @param line The new line.
 /// @param[out] err Details of an error that may have occurred
 void buffer_set_line(Buffer buffer, Integer index, String line, Error *err)
-    FUNC_API_NOEVAL
 {
   Object l = STRING_OBJ(line);
   Array array = { .items = &l, .size = 1 };
   index = convert_index(index);
-  buffer_set_lines(0, buffer, index, index+1, true,  array, err);
+  nvim_buf_set_lines(0, buffer, index, index+1, true,  array, err);
 }
 
 /// Deletes a buffer line
 ///
-/// @deprecated use buffer_set_lines instead.
+/// @deprecated use nvim_buf_set_lines instead.
 ///             for positive indices use
-///                 "buffer_set_lines(buffer, index, index+1, true, [])"
+///                 "nvim_buf_set_lines(buffer, index, index+1, true, [])"
 ///             for negative indices use
-///                 "buffer_set_lines(buffer, index-1, index, true, [])"
+///                 "nvim_buf_set_lines(buffer, index-1, index, true, [])"
 /// @param buffer The buffer handle
 /// @param index The line index
 /// @param[out] err Details of an error that may have occurred
 void buffer_del_line(Buffer buffer, Integer index, Error *err)
-    FUNC_API_NOEVAL
 {
   Array array = ARRAY_DICT_INIT;
   index = convert_index(index);
-  buffer_set_lines(0, buffer, index, index+1, true, array, err);
+  nvim_buf_set_lines(0, buffer, index, index+1, true, array, err);
 }
 
 /// Retrieves a line range from the buffer
 ///
-/// @deprecated use buffer_get_lines(buffer, newstart, newend, false)
+/// @deprecated use nvim_buf_get_lines(buffer, newstart, newend, false)
 ///             where newstart = start + int(not include_start) - int(start < 0)
 ///                   newend = end + int(include_end) - int(end < 0)
 ///                   int(bool) = 1 if bool is true else 0
@@ -130,11 +127,10 @@ ArrayOf(String) buffer_get_line_slice(Buffer buffer,
                                       Boolean include_start,
                                       Boolean include_end,
                                       Error *err)
-    FUNC_API_NOEVAL
 {
   start = convert_index(start) + !include_start;
   end = convert_index(end) + include_end;
-  return buffer_get_lines(0, buffer, start , end, false, err);
+  return nvim_buf_get_lines(0, buffer, start , end, false, err);
 }
 
 
@@ -153,12 +149,12 @@ ArrayOf(String) buffer_get_line_slice(Buffer buffer,
 /// @param strict_indexing whether out-of-bounds should be an error.
 /// @param[out] err Details of an error that may have occurred
 /// @return An array of lines
-ArrayOf(String) buffer_get_lines(uint64_t channel_id,
-                                 Buffer buffer,
-                                 Integer start,
-                                 Integer end,
-                                 Boolean strict_indexing,
-                                 Error *err)
+ArrayOf(String) nvim_buf_get_lines(uint64_t channel_id,
+                                   Buffer buffer,
+                                   Integer start,
+                                   Integer end,
+                                   Boolean strict_indexing,
+                                   Error *err)
 {
   Array rv = ARRAY_DICT_INIT;
   buf_T *buf = find_buffer_by_handle(buffer, err);
@@ -219,7 +215,7 @@ end:
 
 /// Replaces a line range on the buffer
 ///
-/// @deprecated use buffer_set_lines(buffer, newstart, newend, false, lines)
+/// @deprecated use nvim_buf_set_lines(buffer, newstart, newend, false, lines)
 ///             where newstart = start + int(not include_start) + int(start < 0)
 ///                   newend = end + int(include_end) + int(end < 0)
 ///                   int(bool) = 1 if bool is true else 0
@@ -237,13 +233,12 @@ void buffer_set_line_slice(Buffer buffer,
                            Integer end,
                            Boolean include_start,
                            Boolean include_end,
-                           ArrayOf(String) replacement,
+                           ArrayOf(String) replacement,  // NOLINT
                            Error *err)
-    FUNC_API_NOEVAL
 {
   start = convert_index(start) + !include_start;
   end = convert_index(end) + include_end;
-  buffer_set_lines(0, buffer, start, end, false, replacement, err);
+  nvim_buf_set_lines(0, buffer, start, end, false, replacement, err);
 }
 
 
@@ -265,13 +260,13 @@ void buffer_set_line_slice(Buffer buffer,
 /// @param strict_indexing whether out-of-bounds should be an error.
 /// @param replacement An array of lines to use as replacement
 /// @param[out] err Details of an error that may have occurred
-void buffer_set_lines(uint64_t channel_id,
-                      Buffer buffer,
-                      Integer start,
-                      Integer end,
-                      Boolean strict_indexing,
-                      ArrayOf(String) replacement,
-                      Error *err)
+void nvim_buf_set_lines(uint64_t channel_id,
+                        Buffer buffer,
+                        Integer start,
+                        Integer end,
+                        Boolean strict_indexing,
+                        ArrayOf(String) replacement,  // NOLINT
+                        Error *err)
 {
   buf_T *buf = find_buffer_by_handle(buffer, err);
 
@@ -421,7 +416,7 @@ end:
 /// @param name The variable name
 /// @param[out] err Details of an error that may have occurred
 /// @return The variable value
-Object buffer_get_var(Buffer buffer, String name, Error *err)
+Object nvim_buf_get_var(Buffer buffer, String name, Error *err)
 {
   buf_T *buf = find_buffer_by_handle(buffer, err);
 
@@ -442,7 +437,7 @@ Object buffer_get_var(Buffer buffer, String name, Error *err)
 ///
 ///         @warning It may return nil if there was no previous value
 ///                  or if previous value was `v:null`.
-Object buffer_set_var(Buffer buffer, String name, Object value, Error *err)
+Object nvim_buf_set_var(Buffer buffer, String name, Object value, Error *err)
 {
   buf_T *buf = find_buffer_by_handle(buffer, err);
 
@@ -462,7 +457,7 @@ Object buffer_set_var(Buffer buffer, String name, Object value, Error *err)
 ///
 ///         @warning It may return nil if there was no previous value
 ///                  or if previous value was `v:null`.
-Object buffer_del_var(Buffer buffer, String name, Error *err)
+Object nvim_buf_del_var(Buffer buffer, String name, Error *err)
 {
   buf_T *buf = find_buffer_by_handle(buffer, err);
 
@@ -479,7 +474,7 @@ Object buffer_del_var(Buffer buffer, String name, Error *err)
 /// @param name The option name
 /// @param[out] err Details of an error that may have occurred
 /// @return The option value
-Object buffer_get_option(Buffer buffer, String name, Error *err)
+Object nvim_buf_get_option(Buffer buffer, String name, Error *err)
 {
   buf_T *buf = find_buffer_by_handle(buffer, err);
 
@@ -497,7 +492,7 @@ Object buffer_get_option(Buffer buffer, String name, Error *err)
 /// @param name The option name
 /// @param value The option value
 /// @param[out] err Details of an error that may have occurred
-void buffer_set_option(Buffer buffer, String name, Object value, Error *err)
+void nvim_buf_set_option(Buffer buffer, String name, Object value, Error *err)
 {
   buf_T *buf = find_buffer_by_handle(buffer, err);
 
@@ -513,7 +508,7 @@ void buffer_set_option(Buffer buffer, String name, Object value, Error *err)
 /// @param buffer The buffer handle
 /// @param[out] err Details of an error that may have occurred
 /// @return The buffer number
-Integer buffer_get_number(Buffer buffer, Error *err)
+Integer nvim_buf_get_number(Buffer buffer, Error *err)
 {
   Integer rv = 0;
   buf_T *buf = find_buffer_by_handle(buffer, err);
@@ -530,7 +525,7 @@ Integer buffer_get_number(Buffer buffer, Error *err)
 /// @param buffer The buffer handle
 /// @param[out] err Details of an error that may have occurred
 /// @return The buffer name
-String buffer_get_name(Buffer buffer, Error *err)
+String nvim_buf_get_name(Buffer buffer, Error *err)
 {
   String rv = STRING_INIT;
   buf_T *buf = find_buffer_by_handle(buffer, err);
@@ -547,7 +542,7 @@ String buffer_get_name(Buffer buffer, Error *err)
 /// @param buffer The buffer handle
 /// @param name The buffer name
 /// @param[out] err Details of an error that may have occurred
-void buffer_set_name(Buffer buffer, String name, Error *err)
+void nvim_buf_set_name(Buffer buffer, String name, Error *err)
 {
   buf_T *buf = find_buffer_by_handle(buffer, err);
 
@@ -576,7 +571,7 @@ void buffer_set_name(Buffer buffer, String name, Error *err)
 ///
 /// @param buffer The buffer handle
 /// @return true if the buffer is valid, false otherwise
-Boolean buffer_is_valid(Buffer buffer)
+Boolean nvim_buf_is_valid(Buffer buffer)
 {
   Error stub = ERROR_INIT;
   return find_buffer_by_handle(buffer, &stub) != NULL;
@@ -584,7 +579,7 @@ Boolean buffer_is_valid(Buffer buffer)
 
 /// Inserts a sequence of lines to a buffer at a certain index
 ///
-/// @deprecated use buffer_set_lines(buffer, lnum, lnum, true, lines)
+/// @deprecated use nvim_buf_set_lines(buffer, lnum, lnum, true, lines)
 ///
 /// @param buffer The buffer handle
 /// @param lnum Insert the lines after `lnum`. If negative, it will append
@@ -595,11 +590,10 @@ void buffer_insert(Buffer buffer,
                    Integer lnum,
                    ArrayOf(String) lines,
                    Error *err)
-    FUNC_API_NOEVAL
 {
   // "lnum" will be the index of the line after inserting,
   // no matter if it is negative or not
-  buffer_set_lines(0, buffer, lnum, lnum, true, lines, err);
+  nvim_buf_set_lines(0, buffer, lnum, lnum, true, lines, err);
 }
 
 /// Return a tuple (row,col) representing the position of the named mark
@@ -608,7 +602,7 @@ void buffer_insert(Buffer buffer,
 /// @param name The mark's name
 /// @param[out] err Details of an error that may have occurred
 /// @return The (row, col) tuple
-ArrayOf(Integer, 2) buffer_get_mark(Buffer buffer, String name, Error *err)
+ArrayOf(Integer, 2) nvim_buf_get_mark(Buffer buffer, String name, Error *err)
 {
   Array rv = ARRAY_DICT_INIT;
   buf_T *buf = find_buffer_by_handle(buffer, err);
@@ -658,7 +652,7 @@ ArrayOf(Integer, 2) buffer_get_mark(Buffer buffer, String name, Error *err)
 /// called with src_id = 0, an unique source id is generated and returned.
 /// Succesive calls can pass in it as "src_id" to add new highlights to the same
 /// source group. All highlights in the same group can then be cleared with
-/// buffer_clear_highlight. If the highlight never will be manually deleted
+/// nvim_buf_clear_highlight. If the highlight never will be manually deleted
 /// pass in -1 for "src_id".
 ///
 /// If "hl_group" is the empty string no highlight is added, but a new src_id
@@ -676,13 +670,13 @@ ArrayOf(Integer, 2) buffer_get_mark(Buffer buffer, String name, Error *err)
 ///                or -1 to highlight to end of line
 /// @param[out] err Details of an error that may have occurred
 /// @return The src_id that was used
-Integer buffer_add_highlight(Buffer buffer,
-                             Integer src_id,
-                             String hl_group,
-                             Integer line,
-                             Integer col_start,
-                             Integer col_end,
-                             Error *err)
+Integer nvim_buf_add_highlight(Buffer buffer,
+                               Integer src_id,
+                               String hl_group,
+                               Integer line,
+                               Integer col_start,
+                               Integer col_end,
+                               Error *err)
 {
   buf_T *buf = find_buffer_by_handle(buffer, err);
   if (!buf) {
@@ -718,11 +712,11 @@ Integer buffer_add_highlight(Buffer buffer,
 /// @param line_end End of range of lines to clear (exclusive)
 ///                 or -1 to clear to end of file.
 /// @param[out] err Details of an error that may have occurred
-void buffer_clear_highlight(Buffer buffer,
-                            Integer src_id,
-                            Integer line_start,
-                            Integer line_end,
-                            Error *err)
+void nvim_buf_clear_highlight(Buffer buffer,
+                              Integer src_id,
+                              Integer line_start,
+                              Integer line_end,
+                              Error *err)
 {
   buf_T *buf = find_buffer_by_handle(buffer, err);
   if (!buf) {
diff --git a/src/nvim/api/private/helpers.c b/src/nvim/api/private/helpers.c
index 32cdb03130..7df2079d93 100644
--- a/src/nvim/api/private/helpers.c
+++ b/src/nvim/api/private/helpers.c
@@ -776,12 +776,15 @@ static void init_type_metadata(Dictionary *metadata)
 
   Dictionary buffer_metadata = ARRAY_DICT_INIT;
   PUT(buffer_metadata, "id", INTEGER_OBJ(kObjectTypeBuffer));
+  PUT(buffer_metadata, "prefix", STRING_OBJ(cstr_to_string("nvim_buf_")));
 
   Dictionary window_metadata = ARRAY_DICT_INIT;
   PUT(window_metadata, "id", INTEGER_OBJ(kObjectTypeWindow));
+  PUT(window_metadata, "prefix", STRING_OBJ(cstr_to_string("nvim_win_")));
 
   Dictionary tabpage_metadata = ARRAY_DICT_INIT;
   PUT(tabpage_metadata, "id", INTEGER_OBJ(kObjectTypeTabpage));
+  PUT(tabpage_metadata, "prefix", STRING_OBJ(cstr_to_string("nvim_tabpage_")));
 
   PUT(types, "Buffer", DICTIONARY_OBJ(buffer_metadata));
   PUT(types, "Window", DICTIONARY_OBJ(window_metadata));
diff --git a/src/nvim/api/tabpage.c b/src/nvim/api/tabpage.c
index c8311b0aa0..5eb901bcb1 100644
--- a/src/nvim/api/tabpage.c
+++ b/src/nvim/api/tabpage.c
@@ -14,7 +14,7 @@
 /// @param tabpage The tabpage
 /// @param[out] err Details of an error that may have occurred
 /// @return The windows in `tabpage`
-ArrayOf(Window) tabpage_get_windows(Tabpage tabpage, Error *err)
+ArrayOf(Window) nvim_tabpage_get_windows(Tabpage tabpage, Error *err)
 {
   Array rv = ARRAY_DICT_INIT;
   tabpage_T *tab = find_tab_by_handle(tabpage, err);
@@ -43,7 +43,7 @@ ArrayOf(Window) tabpage_get_windows(Tabpage tabpage, Error *err)
 /// @param name The variable name
 /// @param[out] err Details of an error that may have occurred
 /// @return The variable value
-Object tabpage_get_var(Tabpage tabpage, String name, Error *err)
+Object nvim_tabpage_get_var(Tabpage tabpage, String name, Error *err)
 {
   tabpage_T *tab = find_tab_by_handle(tabpage, err);
 
@@ -64,7 +64,10 @@ Object tabpage_get_var(Tabpage tabpage, String name, Error *err)
 ///
 ///         @warning It may return nil if there was no previous value
 ///                  or if previous value was `v:null`.
-Object tabpage_set_var(Tabpage tabpage, String name, Object value, Error *err)
+Object nvim_tabpage_set_var(Tabpage tabpage,
+                            String name,
+                            Object value,
+                            Error *err)
 {
   tabpage_T *tab = find_tab_by_handle(tabpage, err);
 
@@ -84,7 +87,7 @@ Object tabpage_set_var(Tabpage tabpage, String name, Object value, Error *err)
 ///
 ///         @warning It may return nil if there was no previous value
 ///                  or if previous value was `v:null`.
-Object tabpage_del_var(Tabpage tabpage, String name, Error *err)
+Object nvim_tabpage_del_var(Tabpage tabpage, String name, Error *err)
 {
   tabpage_T *tab = find_tab_by_handle(tabpage, err);
 
@@ -100,7 +103,7 @@ Object tabpage_del_var(Tabpage tabpage, String name, Error *err)
 /// @param tabpage The tab page handle
 /// @param[out] err Details of an error that may have occurred
 /// @return The Window handle
-Window tabpage_get_window(Tabpage tabpage, Error *err)
+Window nvim_tabpage_get_window(Tabpage tabpage, Error *err)
 {
   Window rv = 0;
   tabpage_T *tab = find_tab_by_handle(tabpage, err);
@@ -110,7 +113,7 @@ Window tabpage_get_window(Tabpage tabpage, Error *err)
   }
 
   if (tab == curtab) {
-    return vim_get_current_window();
+    return nvim_get_current_window();
   } else {
     FOR_ALL_WINDOWS_IN_TAB(wp, tab) {
       if (wp == tab->tp_curwin) {
@@ -126,7 +129,7 @@ Window tabpage_get_window(Tabpage tabpage, Error *err)
 ///
 /// @param tabpage The tab page handle
 /// @return true if the tab page is valid, false otherwise
-Boolean tabpage_is_valid(Tabpage tabpage)
+Boolean nvim_tabpage_is_valid(Tabpage tabpage)
 {
   Error stub = ERROR_INIT;
   return find_tab_by_handle(tabpage, &stub) != NULL;
diff --git a/src/nvim/api/ui.c b/src/nvim/api/ui.c
index 5426ccc8aa..56b41f1eea 100644
--- a/src/nvim/api/ui.c
+++ b/src/nvim/api/ui.c
@@ -127,11 +127,6 @@ void nvim_ui_detach(uint64_t channel_id, Error *err)
   remote_ui_disconnect(channel_id);
 }
 
-/// @deprecated
-void ui_detach(uint64_t channel_id, Error *err)
-{
-  nvim_ui_detach(channel_id, err);
-}
 
 void nvim_ui_try_resize(uint64_t channel_id, Integer width,
                         Integer height, Error *err)
@@ -154,13 +149,6 @@ void nvim_ui_try_resize(uint64_t channel_id, Integer width,
   ui_refresh();
 }
 
-/// @deprecated
-void ui_try_resize(uint64_t channel_id, Integer width,
-                   Integer height, Error *err)
-{
-  nvim_ui_try_resize(channel_id, width, height, err);
-}
-
 void nvim_ui_set_option(uint64_t channel_id, String name,
                         Object value, Error *error)
     FUNC_API_NOEVAL
diff --git a/src/nvim/api/vim.c b/src/nvim/api/vim.c
index aa86e61e29..bba7d7b9c2 100644
--- a/src/nvim/api/vim.c
+++ b/src/nvim/api/vim.c
@@ -36,7 +36,7 @@
 ///
 /// @param str The command str
 /// @param[out] err Details of an error that may have occurred
-void vim_command(String str, Error *err)
+void nvim_command(String str, Error *err)
 {
   // Run the command
   try_start();
@@ -52,7 +52,7 @@ void vim_command(String str, Error *err)
 /// @param escape_csi the string needs escaping for K_SPECIAL/CSI bytes
 /// @see feedkeys()
 /// @see vim_strsave_escape_csi
-void vim_feedkeys(String keys, String mode, Boolean escape_csi)
+void nvim_feedkeys(String keys, String mode, Boolean escape_csi)
 {
   bool remap = true;
   bool insert = false;
@@ -96,14 +96,14 @@ void vim_feedkeys(String keys, String mode, Boolean escape_csi)
   }
 }
 
-/// Passes input keys to Neovim. Unlike `vim_feedkeys`, this will use a
+/// Passes input keys to Neovim. Unlike `nvim_feedkeys`, this will use a
 /// lower-level input buffer and the call is not deferred.
 /// This is the most reliable way to emulate real user input.
 ///
 /// @param keys to be typed
 /// @return The number of bytes actually written, which can be lower than
 ///         requested if the buffer becomes full.
-Integer vim_input(String keys)
+Integer nvim_input(String keys)
     FUNC_API_ASYNC
 {
   return (Integer)input_enqueue(keys);
@@ -113,7 +113,7 @@ Integer vim_input(String keys)
 ///
 /// @see replace_termcodes
 /// @see cpoptions
-String vim_replace_termcodes(String str, Boolean from_part, Boolean do_lt,
+String nvim_replace_termcodes(String str, Boolean from_part, Boolean do_lt,
                               Boolean special)
 {
   if (str.size == 0) {
@@ -133,10 +133,10 @@ String vim_replace_termcodes(String str, Boolean from_part, Boolean do_lt,
   return cstr_as_string(ptr);
 }
 
-String vim_command_output(String str, Error *err)
+String nvim_command_output(String str, Error *err)
 {
   do_cmdline_cmd("redir => v:command_output");
-  vim_command(str, err);
+  nvim_command(str, err);
   do_cmdline_cmd("redir END");
 
   if (err->set) {
@@ -153,7 +153,7 @@ String vim_command_output(String str, Error *err)
 /// @param str The expression str
 /// @param[out] err Details of an error that may have occurred
 /// @return The expanded object
-Object vim_eval(String str, Error *err)
+Object nvim_eval(String str, Error *err)
 {
   Object rv = OBJECT_INIT;
   // Evaluate the expression
@@ -180,7 +180,7 @@ Object vim_eval(String str, Error *err)
 /// @param args Functions arguments packed in an Array
 /// @param[out] err Details of an error that may have occurred
 /// @return Result of the function call
-Object vim_call_function(String fname, Array args, Error *err)
+Object nvim_call_function(String fname, Array args, Error *err)
 {
   Object rv = OBJECT_INIT;
   if (args.size > MAX_FUNC_ARGS) {
@@ -229,7 +229,7 @@ free_vim_args:
 /// @param str Some text
 /// @param[out] err Details of an error that may have occurred
 /// @return The number of cells
-Integer vim_strwidth(String str, Error *err)
+Integer nvim_strwidth(String str, Error *err)
 {
   if (str.size > INT_MAX) {
     api_set_error(err, Validation, _("String length is too high"));
@@ -242,7 +242,7 @@ Integer vim_strwidth(String str, Error *err)
 /// Gets a list of paths contained in 'runtimepath'
 ///
 /// @return The list of paths
-ArrayOf(String) vim_list_runtime_paths(void)
+ArrayOf(String) nvim_list_runtime_paths(void)
 {
   Array rv = ARRAY_DICT_INIT;
   uint8_t *rtp = p_rtp;
@@ -283,7 +283,7 @@ ArrayOf(String) vim_list_runtime_paths(void)
 ///
 /// @param dir The new working directory
 /// @param[out] err Details of an error that may have occurred
-void vim_change_directory(String dir, Error *err)
+void nvim_change_directory(String dir, Error *err)
 {
   if (dir.size >= MAXPATHL) {
     api_set_error(err, Validation, _("Directory string is too long"));
@@ -311,7 +311,7 @@ void vim_change_directory(String dir, Error *err)
 ///
 /// @param[out] err Details of an error that may have occurred
 /// @return The current line string
-String vim_get_current_line(Error *err)
+String nvim_get_current_line(Error *err)
 {
   return buffer_get_line(curbuf->handle, curwin->w_cursor.lnum - 1, err);
 }
@@ -320,7 +320,7 @@ String vim_get_current_line(Error *err)
 ///
 /// @param line The line contents
 /// @param[out] err Details of an error that may have occurred
-void vim_set_current_line(String line, Error *err)
+void nvim_set_current_line(String line, Error *err)
 {
   buffer_set_line(curbuf->handle, curwin->w_cursor.lnum - 1, line, err);
 }
@@ -328,7 +328,7 @@ void vim_set_current_line(String line, Error *err)
 /// Deletes the current line
 ///
 /// @param[out] err Details of an error that may have occurred
-void vim_del_current_line(Error *err)
+void nvim_del_current_line(Error *err)
 {
   buffer_del_line(curbuf->handle, curwin->w_cursor.lnum - 1, err);
 }
@@ -338,7 +338,7 @@ void vim_del_current_line(Error *err)
 /// @param name The variable name
 /// @param[out] err Details of an error that may have occurred
 /// @return The variable value
-Object vim_get_var(String name, Error *err)
+Object nvim_get_var(String name, Error *err)
 {
   return dict_get_value(&globvardict, name, err);
 }
@@ -352,7 +352,7 @@ Object vim_get_var(String name, Error *err)
 ///
 ///         @warning It may return nil if there was no previous value
 ///                  or if previous value was `v:null`.
-Object vim_set_var(String name, Object value, Error *err)
+Object nvim_set_var(String name, Object value, Error *err)
 {
   return dict_set_value(&globvardict, name, value, false, err);
 }
@@ -365,7 +365,7 @@ Object vim_set_var(String name, Object value, Error *err)
 ///
 ///         @warning It may return nil if there was no previous value
 ///                  or if previous value was `v:null`.
-Object vim_del_var(String name, Error *err)
+Object nvim_del_var(String name, Error *err)
 {
   return dict_set_value(&globvardict, name, NIL, true, err);
 }
@@ -375,7 +375,7 @@ Object vim_del_var(String name, Error *err)
 /// @param name The variable name
 /// @param[out] err Details of an error that may have occurred
 /// @return The variable value
-Object vim_get_vvar(String name, Error *err)
+Object nvim_get_vvar(String name, Error *err)
 {
   return dict_get_value(&vimvardict, name, err);
 }
@@ -385,7 +385,7 @@ Object vim_get_vvar(String name, Error *err)
 /// @param name The option name
 /// @param[out] err Details of an error that may have occurred
 /// @return The option value
-Object vim_get_option(String name, Error *err)
+Object nvim_get_option(String name, Error *err)
 {
   return get_option_from(NULL, SREQ_GLOBAL, name, err);
 }
@@ -395,7 +395,7 @@ Object vim_get_option(String name, Error *err)
 /// @param name The option name
 /// @param value The new option value
 /// @param[out] err Details of an error that may have occurred
-void vim_set_option(String name, Object value, Error *err)
+void nvim_set_option(String name, Object value, Error *err)
 {
   set_option_to(NULL, SREQ_GLOBAL, name, value, err);
 }
@@ -403,7 +403,7 @@ void vim_set_option(String name, Object value, Error *err)
 /// Writes a message to vim output buffer
 ///
 /// @param str The message
-void vim_out_write(String str)
+void nvim_out_write(String str)
 {
   write_msg(str, false);
 }
@@ -411,25 +411,25 @@ void vim_out_write(String str)
 /// Writes a message to vim error buffer
 ///
 /// @param str The message
-void vim_err_write(String str)
+void nvim_err_write(String str)
 {
   write_msg(str, true);
 }
 
 /// Higher level error reporting function that ensures all str contents
-/// are written by sending a trailing linefeed to `vim_err_write`
+/// are written by sending a trailing linefeed to `nvim_err_write`
 ///
 /// @param str The message
-void vim_report_error(String str)
+void nvim_report_error(String str)
 {
-  vim_err_write(str);
-  vim_err_write((String) {.data = "\n", .size = 1});
+  nvim_err_write(str);
+  nvim_err_write((String) { .data = "\n", .size = 1 });
 }
 
 /// Gets the current list of buffer handles
 ///
 /// @return The number of buffers
-ArrayOf(Buffer) vim_get_buffers(void)
+ArrayOf(Buffer) nvim_get_buffers(void)
 {
   Array rv = ARRAY_DICT_INIT;
 
@@ -450,7 +450,7 @@ ArrayOf(Buffer) vim_get_buffers(void)
 /// Gets the current buffer
 ///
 /// @reqturn The buffer handle
-Buffer vim_get_current_buffer(void)
+Buffer nvim_get_current_buffer(void)
 {
   return curbuf->handle;
 }
@@ -459,7 +459,7 @@ Buffer vim_get_current_buffer(void)
 ///
 /// @param id The buffer handle
 /// @param[out] err Details of an error that may have occurred
-void vim_set_current_buffer(Buffer buffer, Error *err)
+void nvim_set_current_buffer(Buffer buffer, Error *err)
 {
   buf_T *buf = find_buffer_by_handle(buffer, err);
 
@@ -480,7 +480,7 @@ void vim_set_current_buffer(Buffer buffer, Error *err)
 /// Gets the current list of window handles
 ///
 /// @return The number of windows
-ArrayOf(Window) vim_get_windows(void)
+ArrayOf(Window) nvim_get_windows(void)
 {
   Array rv = ARRAY_DICT_INIT;
 
@@ -501,7 +501,7 @@ ArrayOf(Window) vim_get_windows(void)
 /// Gets the current window
 ///
 /// @return The window handle
-Window vim_get_current_window(void)
+Window nvim_get_current_window(void)
 {
   return curwin->handle;
 }
@@ -509,7 +509,7 @@ Window vim_get_current_window(void)
 /// Sets the current window
 ///
 /// @param handle The window handle
-void vim_set_current_window(Window window, Error *err)
+void nvim_set_current_window(Window window, Error *err)
 {
   win_T *win = find_window_by_handle(window, err);
 
@@ -530,7 +530,7 @@ void vim_set_current_window(Window window, Error *err)
 /// Gets the current list of tabpage handles
 ///
 /// @return The number of tab pages
-ArrayOf(Tabpage) vim_get_tabpages(void)
+ArrayOf(Tabpage) nvim_get_tabpages(void)
 {
   Array rv = ARRAY_DICT_INIT;
 
@@ -551,7 +551,7 @@ ArrayOf(Tabpage) vim_get_tabpages(void)
 /// Gets the current tab page
 ///
 /// @return The tab page handle
-Tabpage vim_get_current_tabpage(void)
+Tabpage nvim_get_current_tabpage(void)
 {
   return curtab->handle;
 }
@@ -560,7 +560,7 @@ Tabpage vim_get_current_tabpage(void)
 ///
 /// @param handle The tab page handle
 /// @param[out] err Details of an error that may have occurred
-void vim_set_current_tabpage(Tabpage tabpage, Error *err)
+void nvim_set_current_tabpage(Tabpage tabpage, Error *err)
 {
   tabpage_T *tp = find_tab_by_handle(tabpage, err);
 
@@ -582,7 +582,7 @@ void vim_set_current_tabpage(Tabpage tabpage, Error *err)
 ///
 /// @param channel_id The channel id (passed automatically by the dispatcher)
 /// @param event The event type string
-void vim_subscribe(uint64_t channel_id, String event)
+void nvim_subscribe(uint64_t channel_id, String event)
     FUNC_API_NOEVAL
 {
   size_t length = (event.size < METHOD_MAXLEN ? event.size : METHOD_MAXLEN);
@@ -596,7 +596,7 @@ void vim_subscribe(uint64_t channel_id, String event)
 ///
 /// @param channel_id The channel id (passed automatically by the dispatcher)
 /// @param event The event type string
-void vim_unsubscribe(uint64_t channel_id, String event)
+void nvim_unsubscribe(uint64_t channel_id, String event)
     FUNC_API_NOEVAL
 {
   size_t length = (event.size < METHOD_MAXLEN ?
@@ -608,12 +608,12 @@ void vim_unsubscribe(uint64_t channel_id, String event)
   channel_unsubscribe(channel_id, e);
 }
 
-Integer vim_name_to_color(String name)
+Integer nvim_name_to_color(String name)
 {
   return name_to_color((uint8_t *)name.data);
 }
 
-Dictionary vim_get_color_map(void)
+Dictionary nvim_get_color_map(void)
 {
   Dictionary colors = ARRAY_DICT_INIT;
 
@@ -625,7 +625,7 @@ Dictionary vim_get_color_map(void)
 }
 
 
-Array vim_get_api_info(uint64_t channel_id)
+Array nvim_get_api_info(uint64_t channel_id)
     FUNC_API_ASYNC FUNC_API_NOEVAL
 {
   Array rv = ARRAY_DICT_INIT;
diff --git a/src/nvim/api/window.c b/src/nvim/api/window.c
index f644453358..9c7fdb0697 100644
--- a/src/nvim/api/window.c
+++ b/src/nvim/api/window.c
@@ -19,7 +19,7 @@
 /// @param window The window handle
 /// @param[out] err Details of an error that may have occurred
 /// @return The buffer handle
-Buffer window_get_buffer(Window window, Error *err)
+Buffer nvim_win_get_buffer(Window window, Error *err)
 {
   win_T *win = find_window_by_handle(window, err);
 
@@ -35,7 +35,7 @@ Buffer window_get_buffer(Window window, Error *err)
 /// @param window The window handle
 /// @param[out] err Details of an error that may have occurred
 /// @return the (row, col) tuple
-ArrayOf(Integer, 2) window_get_cursor(Window window, Error *err)
+ArrayOf(Integer, 2) nvim_win_get_cursor(Window window, Error *err)
 {
   Array rv = ARRAY_DICT_INIT;
   win_T *win = find_window_by_handle(window, err);
@@ -53,7 +53,7 @@ ArrayOf(Integer, 2) window_get_cursor(Window window, Error *err)
 /// @param window The window handle
 /// @param pos the (row, col) tuple representing the new position
 /// @param[out] err Details of an error that may have occurred
-void window_set_cursor(Window window, ArrayOf(Integer, 2) pos, Error *err)
+void nvim_win_set_cursor(Window window, ArrayOf(Integer, 2) pos, Error *err)
 {
   win_T *win = find_window_by_handle(window, err);
 
@@ -99,7 +99,7 @@ void window_set_cursor(Window window, ArrayOf(Integer, 2) pos, Error *err)
 /// @param window The window handle
 /// @param[out] err Details of an error that may have occurred
 /// @return the height in rows
-Integer window_get_height(Window window, Error *err)
+Integer nvim_win_get_height(Window window, Error *err)
 {
   win_T *win = find_window_by_handle(window, err);
 
@@ -116,7 +116,7 @@ Integer window_get_height(Window window, Error *err)
 /// @param window The window handle
 /// @param height the new height in rows
 /// @param[out] err Details of an error that may have occurred
-void window_set_height(Window window, Integer height, Error *err)
+void nvim_win_set_height(Window window, Integer height, Error *err)
 {
   win_T *win = find_window_by_handle(window, err);
 
@@ -142,7 +142,7 @@ void window_set_height(Window window, Integer height, Error *err)
 /// @param window The window handle
 /// @param[out] err Details of an error that may have occurred
 /// @return the width in columns
-Integer window_get_width(Window window, Error *err)
+Integer nvim_win_get_width(Window window, Error *err)
 {
   win_T *win = find_window_by_handle(window, err);
 
@@ -159,7 +159,7 @@ Integer window_get_width(Window window, Error *err)
 /// @param window The window handle
 /// @param width the new width in columns
 /// @param[out] err Details of an error that may have occurred
-void window_set_width(Window window, Integer width, Error *err)
+void nvim_win_set_width(Window window, Integer width, Error *err)
 {
   win_T *win = find_window_by_handle(window, err);
 
@@ -186,7 +186,7 @@ void window_set_width(Window window, Integer width, Error *err)
 /// @param name The variable name
 /// @param[out] err Details of an error that may have occurred
 /// @return The variable value
-Object window_get_var(Window window, String name, Error *err)
+Object nvim_win_get_var(Window window, String name, Error *err)
 {
   win_T *win = find_window_by_handle(window, err);
 
@@ -207,7 +207,7 @@ Object window_get_var(Window window, String name, Error *err)
 ///
 ///         @warning It may return nil if there was no previous value
 ///                  or if previous value was `v:null`.
-Object window_set_var(Window window, String name, Object value, Error *err)
+Object nvim_win_set_var(Window window, String name, Object value, Error *err)
 {
   win_T *win = find_window_by_handle(window, err);
 
@@ -227,7 +227,7 @@ Object window_set_var(Window window, String name, Object value, Error *err)
 ///
 ///         @warning It may return nil if there was no previous value
 ///                  or if previous value was `v:null`.
-Object window_del_var(Window window, String name, Error *err)
+Object nvim_win_del_var(Window window, String name, Error *err)
 {
   win_T *win = find_window_by_handle(window, err);
 
@@ -244,7 +244,7 @@ Object window_del_var(Window window, String name, Error *err)
 /// @param name The option name
 /// @param[out] err Details of an error that may have occurred
 /// @return The option value
-Object window_get_option(Window window, String name, Error *err)
+Object nvim_win_get_option(Window window, String name, Error *err)
 {
   win_T *win = find_window_by_handle(window, err);
 
@@ -262,7 +262,7 @@ Object window_get_option(Window window, String name, Error *err)
 /// @param name The option name
 /// @param value The option value
 /// @param[out] err Details of an error that may have occurred
-void window_set_option(Window window, String name, Object value, Error *err)
+void nvim_win_set_option(Window window, String name, Object value, Error *err)
 {
   win_T *win = find_window_by_handle(window, err);
 
@@ -278,7 +278,7 @@ void window_set_option(Window window, String name, Object value, Error *err)
 /// @param window The window handle
 /// @param[out] err Details of an error that may have occurred
 /// @return The (row, col) tuple with the window position
-ArrayOf(Integer, 2) window_get_position(Window window, Error *err)
+ArrayOf(Integer, 2) nvim_win_get_position(Window window, Error *err)
 {
   Array rv = ARRAY_DICT_INIT;
   win_T *win = find_window_by_handle(window, err);
@@ -296,7 +296,7 @@ ArrayOf(Integer, 2) window_get_position(Window window, Error *err)
 /// @param window The window handle
 /// @param[out] err Details of an error that may have occurred
 /// @return The tab page that contains the window
-Tabpage window_get_tabpage(Window window, Error *err)
+Tabpage nvim_win_get_tabpage(Window window, Error *err)
 {
   Tabpage rv = 0;
   win_T *win = find_window_by_handle(window, err);
@@ -312,7 +312,7 @@ Tabpage window_get_tabpage(Window window, Error *err)
 ///
 /// @param window The window handle
 /// @return true if the window is valid, false otherwise
-Boolean window_is_valid(Window window)
+Boolean nvim_win_is_valid(Window window)
 {
   Error stub = ERROR_INIT;
   return find_window_by_handle(window, &stub) != NULL;
diff --git a/src/nvim/eval.c b/src/nvim/eval.c
index 8313d726e7..ac34ad4923 100644
--- a/src/nvim/eval.c
+++ b/src/nvim/eval.c
@@ -7131,7 +7131,7 @@ static void api_wrapper(typval_T *argvars, typval_T *rettv, FunPtr fptr)
   Object result = fn(INVALID_CHANNEL, NO_RESPONSE, args, &err);
 
   if (err.set) {
-    vim_report_error(cstr_as_string(err.msg));
+    nvim_report_error(cstr_as_string(err.msg));
     goto end;
   }
 
@@ -8837,8 +8837,8 @@ static void f_feedkeys(typval_T *argvars, typval_T *rettv, FunPtr fptr)
       flags = get_tv_string_buf(&argvars[1], nbuf);
     }
 
-    vim_feedkeys(cstr_as_string((char *)keys),
-                 cstr_as_string((char *)flags), true);
+    nvim_feedkeys(cstr_as_string((char *)keys),
+                  cstr_as_string((char *)flags), true);
   }
 }
 
@@ -13751,7 +13751,7 @@ static void f_rpcrequest(typval_T *argvars, typval_T *rettv, FunPtr fptr)
   }
 
   if (err.set) {
-    vim_report_error(cstr_as_string(err.msg));
+    nvim_report_error(cstr_as_string(err.msg));
     goto end;
   }
 
diff --git a/src/nvim/tui/input.c b/src/nvim/tui/input.c
index 3ef4d34c9a..44521c5ae6 100644
--- a/src/nvim/tui/input.c
+++ b/src/nvim/tui/input.c
@@ -216,8 +216,8 @@ static int get_key_code_timeout(void)
   // Check 'ttimeout' to determine if we should send ESC after 'ttimeoutlen'.
   // See :help 'ttimeout' for more information
   Error err = ERROR_INIT;
-  if (vim_get_option(cstr_as_string("ttimeout"), &err).data.boolean) {
-    ms = vim_get_option(cstr_as_string("ttimeoutlen"), &err).data.integer;
+  if (nvim_get_option(cstr_as_string("ttimeout"), &err).data.boolean) {
+    ms = nvim_get_option(cstr_as_string("ttimeoutlen"), &err).data.integer;
   }
 
   return (int)ms;
diff --git a/test/functional/api/buffer_spec.lua b/test/functional/api/buffer_spec.lua
index cf8a83ad81..2cc803da52 100644
--- a/test/functional/api/buffer_spec.lua
+++ b/test/functional/api/buffer_spec.lua
@@ -3,105 +3,111 @@ local helpers = require('test.functional.helpers')(after_each)
 local clear, nvim, buffer = helpers.clear, helpers.nvim, helpers.buffer
 local curbuf, curwin, eq = helpers.curbuf, helpers.curwin, helpers.eq
 local curbufmeths, ok = helpers.curbufmeths, helpers.ok
-local funcs = helpers.funcs
+local funcs, request = helpers.funcs, helpers.request
 
 describe('buffer_* functions', function()
   before_each(clear)
 
+  -- access deprecated functions
+  local function curbuf_depr(method, ...)
+    return request('buffer_'..method, 0, ...)
+  end
+
+
   describe('line_count, insert and del_line', function()
     it('works', function()
-      eq(1, curbuf('line_count'))
-      curbuf('insert', -1, {'line'})
-      eq(2, curbuf('line_count'))
-      curbuf('insert', -1, {'line'})
-      eq(3, curbuf('line_count'))
-      curbuf('del_line', -1)
-      eq(2, curbuf('line_count'))
-      curbuf('del_line', -1)
-      curbuf('del_line', -1)
+      eq(1, curbuf_depr('line_count'))
+      curbuf_depr('insert', -1, {'line'})
+      eq(2, curbuf_depr('line_count'))
+      curbuf_depr('insert', -1, {'line'})
+      eq(3, curbuf_depr('line_count'))
+      curbuf_depr('del_line', -1)
+      eq(2, curbuf_depr('line_count'))
+      curbuf_depr('del_line', -1)
+      curbuf_depr('del_line', -1)
       -- There's always at least one line
-      eq(1, curbuf('line_count'))
+      eq(1, curbuf_depr('line_count'))
     end)
   end)
 
 
   describe('{get,set,del}_line', function()
     it('works', function()
-      eq('', curbuf('get_line', 0))
-      curbuf('set_line', 0, 'line1')
-      eq('line1', curbuf('get_line', 0))
-      curbuf('set_line', 0, 'line2')
-      eq('line2', curbuf('get_line', 0))
-      curbuf('del_line', 0)
-      eq('', curbuf('get_line', 0))
+      eq('', curbuf_depr('get_line', 0))
+      curbuf_depr('set_line', 0, 'line1')
+      eq('line1', curbuf_depr('get_line', 0))
+      curbuf_depr('set_line', 0, 'line2')
+      eq('line2', curbuf_depr('get_line', 0))
+      curbuf_depr('del_line', 0)
+      eq('', curbuf_depr('get_line', 0))
     end)
 
     it('get_line: out-of-bounds is an error', function()
-      curbuf('set_line', 0, 'line1.a')
-      eq(1, curbuf('line_count')) -- sanity
-      eq(false, pcall(curbuf, 'get_line', 1))
-      eq(false, pcall(curbuf, 'get_line', -2))
+      curbuf_depr('set_line', 0, 'line1.a')
+      eq(1, curbuf_depr('line_count')) -- sanity
+      eq(false, pcall(curbuf_depr, 'get_line', 1))
+      eq(false, pcall(curbuf_depr, 'get_line', -2))
     end)
 
     it('set_line, del_line: out-of-bounds is an error', function()
-      curbuf('set_line', 0, 'line1.a')
-      eq(false, pcall(curbuf, 'set_line', 1, 'line1.b'))
-      eq(false, pcall(curbuf, 'set_line', -2, 'line1.b'))
-      eq(false, pcall(curbuf, 'del_line', 2))
-      eq(false, pcall(curbuf, 'del_line', -3))
+      curbuf_depr('set_line', 0, 'line1.a')
+      eq(false, pcall(curbuf_depr, 'set_line', 1, 'line1.b'))
+      eq(false, pcall(curbuf_depr, 'set_line', -2, 'line1.b'))
+      eq(false, pcall(curbuf_depr, 'del_line', 2))
+      eq(false, pcall(curbuf_depr, 'del_line', -3))
     end)
 
     it('can handle NULs', function()
-      curbuf('set_line', 0, 'ab\0cd')
-      eq('ab\0cd', curbuf('get_line', 0))
+      curbuf_depr('set_line', 0, 'ab\0cd')
+      eq('ab\0cd', curbuf_depr('get_line', 0))
     end)
   end)
 
 
   describe('{get,set}_line_slice', function()
     it('get_line_slice: out-of-bounds returns empty array', function()
-      curbuf('set_line_slice', 0, 0, true, true, {'a', 'b', 'c'})
-      eq({'a', 'b', 'c'}, curbuf('get_line_slice', 0, 2, true, true)) --sanity
-
-      eq({}, curbuf('get_line_slice', 2, 3, false, true))
-      eq({}, curbuf('get_line_slice', 3, 9, true, true))
-      eq({}, curbuf('get_line_slice', 3, -1, true, true))
-      eq({}, curbuf('get_line_slice', -3, -4, false, true))
-      eq({}, curbuf('get_line_slice', -4, -5, true, true))
+      curbuf_depr('set_line_slice', 0, 0, true, true, {'a', 'b', 'c'})
+      eq({'a', 'b', 'c'}, curbuf_depr('get_line_slice', 0, 2, true, true)) --sanity
+
+      eq({}, curbuf_depr('get_line_slice', 2, 3, false, true))
+      eq({}, curbuf_depr('get_line_slice', 3, 9, true, true))
+      eq({}, curbuf_depr('get_line_slice', 3, -1, true, true))
+      eq({}, curbuf_depr('get_line_slice', -3, -4, false, true))
+      eq({}, curbuf_depr('get_line_slice', -4, -5, true, true))
     end)
 
     it('set_line_slice: out-of-bounds extends past end', function()
-      curbuf('set_line_slice', 0, 0, true, true, {'a', 'b', 'c'})
-      eq({'a', 'b', 'c'}, curbuf('get_line_slice', 0, 2, true, true)) --sanity
-
-      eq({'c'}, curbuf('get_line_slice', -1, 4, true, true))
-      eq({'a', 'b', 'c'}, curbuf('get_line_slice', 0, 5, true, true))
-      curbuf('set_line_slice', 4, 5, true, true, {'d'})
-      eq({'a', 'b', 'c', 'd'}, curbuf('get_line_slice', 0, 5, true, true))
-      curbuf('set_line_slice', -4, -5, true, true, {'e'})
-      eq({'e', 'a', 'b', 'c', 'd'}, curbuf('get_line_slice', 0, 5, true, true))
+      curbuf_depr('set_line_slice', 0, 0, true, true, {'a', 'b', 'c'})
+      eq({'a', 'b', 'c'}, curbuf_depr('get_line_slice', 0, 2, true, true)) --sanity
+
+      eq({'c'}, curbuf_depr('get_line_slice', -1, 4, true, true))
+      eq({'a', 'b', 'c'}, curbuf_depr('get_line_slice', 0, 5, true, true))
+      curbuf_depr('set_line_slice', 4, 5, true, true, {'d'})
+      eq({'a', 'b', 'c', 'd'}, curbuf_depr('get_line_slice', 0, 5, true, true))
+      curbuf_depr('set_line_slice', -4, -5, true, true, {'e'})
+      eq({'e', 'a', 'b', 'c', 'd'}, curbuf_depr('get_line_slice', 0, 5, true, true))
     end)
 
     it('works', function()
-      eq({''}, curbuf('get_line_slice', 0, -1, true, true))
+      eq({''}, curbuf_depr('get_line_slice', 0, -1, true, true))
       -- Replace buffer
-      curbuf('set_line_slice', 0, -1, true, true, {'a', 'b', 'c'})
-      eq({'a', 'b', 'c'}, curbuf('get_line_slice', 0, -1, true, true))
-      eq({'b', 'c'}, curbuf('get_line_slice', 1, -1, true, true))
-      eq({'b'}, curbuf('get_line_slice', 1, 2, true, false))
-      eq({}, curbuf('get_line_slice', 1, 1, true, false))
-      eq({'a', 'b'}, curbuf('get_line_slice', 0, -1, true, false))
-      eq({'b'}, curbuf('get_line_slice', 1, -1, true, false))
-      eq({'b', 'c'}, curbuf('get_line_slice', -2, -1, true, true))
-      curbuf('set_line_slice', 1, 2, true, false, {'a', 'b', 'c'})
-      eq({'a', 'a', 'b', 'c', 'c'}, curbuf('get_line_slice', 0, -1, true, true))
-      curbuf('set_line_slice', -1, -1, true, true, {'a', 'b', 'c'})
+      curbuf_depr('set_line_slice', 0, -1, true, true, {'a', 'b', 'c'})
+      eq({'a', 'b', 'c'}, curbuf_depr('get_line_slice', 0, -1, true, true))
+      eq({'b', 'c'}, curbuf_depr('get_line_slice', 1, -1, true, true))
+      eq({'b'}, curbuf_depr('get_line_slice', 1, 2, true, false))
+      eq({}, curbuf_depr('get_line_slice', 1, 1, true, false))
+      eq({'a', 'b'}, curbuf_depr('get_line_slice', 0, -1, true, false))
+      eq({'b'}, curbuf_depr('get_line_slice', 1, -1, true, false))
+      eq({'b', 'c'}, curbuf_depr('get_line_slice', -2, -1, true, true))
+      curbuf_depr('set_line_slice', 1, 2, true, false, {'a', 'b', 'c'})
+      eq({'a', 'a', 'b', 'c', 'c'}, curbuf_depr('get_line_slice', 0, -1, true, true))
+      curbuf_depr('set_line_slice', -1, -1, true, true, {'a', 'b', 'c'})
       eq({'a', 'a', 'b', 'c', 'a', 'b', 'c'},
-        curbuf('get_line_slice', 0, -1, true, true))
-      curbuf('set_line_slice', 0, -3, true, false, {})
-      eq({'a', 'b', 'c'}, curbuf('get_line_slice', 0, -1, true, true))
-      curbuf('set_line_slice', 0, -1, true, true, {})
-      eq({''}, curbuf('get_line_slice', 0, -1, true, true))
+        curbuf_depr('get_line_slice', 0, -1, true, true))
+      curbuf_depr('set_line_slice', 0, -3, true, false, {})
+      eq({'a', 'b', 'c'}, curbuf_depr('get_line_slice', 0, -1, true, true))
+      curbuf_depr('set_line_slice', 0, -1, true, true, {})
+      eq({''}, curbuf_depr('get_line_slice', 0, -1, true, true))
     end)
   end)
 
@@ -286,7 +292,7 @@ describe('buffer_* functions', function()
 
   describe('get_mark', function()
     it('works', function()
-      curbuf('insert', -1, {'a', 'bit of', 'text'})
+      curbuf('set_lines', -1, -1, true, {'a', 'bit of', 'text'})
       curwin('set_cursor', {3, 4})
       nvim('command', 'mark V')
       eq({3, 0}, curbuf('get_mark', 'V'))
diff --git a/test/functional/api/vim_spec.lua b/test/functional/api/vim_spec.lua
index 848935fc0f..4195a614c3 100644
--- a/test/functional/api/vim_spec.lua
+++ b/test/functional/api/vim_spec.lua
@@ -7,6 +7,7 @@ local ok, nvim_async, feed = helpers.ok, helpers.nvim_async, helpers.feed
 local os_name = helpers.os_name
 local meths = helpers.meths
 local funcs = helpers.funcs
+local request = helpers.request
 
 describe('vim_* functions', function()
   before_each(clear)
@@ -41,6 +42,10 @@ describe('vim_* functions', function()
       eq(1, nvim('eval',"matcharg(1) == ['', '']"))
       eq({'', ''}, nvim('eval','matcharg(1)'))
     end)
+
+    it('works under deprecated name', function()
+      eq(2, request("vim_eval", "1+1"))
+    end)
   end)
 
   describe('call_function', function()
diff --git a/test/functional/helpers.lua b/test/functional/helpers.lua
index 8dca4c5bbe..65da278f9e 100644
--- a/test/functional/helpers.lua
+++ b/test/functional/helpers.lua
@@ -133,11 +133,11 @@ local function stop()
 end
 
 local function nvim_command(cmd)
-  request('vim_command', cmd)
+  request('nvim_command', cmd)
 end
 
 local function nvim_eval(expr)
-  return request('vim_eval', expr)
+  return request('nvim_eval', expr)
 end
 
 local os_name = (function()
@@ -157,12 +157,12 @@ local os_name = (function()
 end)()
 
 local function nvim_call(name, ...)
-  return request('vim_call_function', name, {...})
+  return request('nvim_call_function', name, {...})
 end
 
 local function nvim_feed(input)
   while #input > 0 do
-    local written = request('vim_input', input)
+    local written = request('nvim_input', input)
     input = input:sub(written + 1)
   end
 end
@@ -339,7 +339,7 @@ local function source(code)
 end
 
 local function nvim(method, ...)
-  return request('vim_'..method, ...)
+  return request('nvim_'..method, ...)
 end
 
 local function ui(method, ...)
@@ -347,27 +347,26 @@ local function ui(method, ...)
 end
 
 local function nvim_async(method, ...)
-  session:notify('vim_'..method, ...)
+  session:notify('nvim_'..method, ...)
 end
 
 local function buffer(method, ...)
-  return request('buffer_'..method, ...)
+  return request('nvim_buf_'..method, ...)
 end
 
 local function window(method, ...)
-  return request('window_'..method, ...)
+  return request('nvim_win_'..method, ...)
 end
 
 local function tabpage(method, ...)
-  return request('tabpage_'..method, ...)
+  return request('nvim_tabpage_'..method, ...)
 end
 
 local function curbuf(method, ...)
-  local buf = nvim('get_current_buffer')
   if not method then
-    return buf
+    return nvim('get_current_buffer')
   end
-  return buffer(method, buf, ...)
+  return buffer(method, 0, ...)
 end
 
 local function wait()
@@ -387,19 +386,17 @@ local function curbuf_contents()
 end
 
 local function curwin(method, ...)
-  local win = nvim('get_current_window')
   if not method then
-    return win
+    return nvim('get_current_window')
   end
-  return window(method, win, ...)
+  return window(method, 0, ...)
 end
 
 local function curtab(method, ...)
-  local tab = nvim('get_current_tabpage')
   if not method then
-    return tab
+    return nvim('get_current_tabpage')
   end
-  return tabpage(method, tab, ...)
+  return tabpage(method, 0, ...)
 end
 
 local function expect(contents)
diff --git a/test/functional/plugin/shada_spec.lua b/test/functional/plugin/shada_spec.lua
index 2595f22929..b1209a22e9 100644
--- a/test/functional/plugin/shada_spec.lua
+++ b/test/functional/plugin/shada_spec.lua
@@ -2463,17 +2463,17 @@ describe('ftplugin/shada.vim', function()
     nvim_command('setlocal filetype=shada')
     funcs.setline(1, '  Replacement with timestamp ' .. epoch)
     nvim_feed('ggA:\027')
-    eq('Replacement with timestamp ' .. epoch .. ':', curbuf('get_line', 0))
+    eq('Replacement with timestamp ' .. epoch .. ':', curbuf('get_lines', 0, 1, true)[1])
     nvim_feed('o-\027')
-    eq('  -', curbuf('get_line', 1))
+    eq({'  -'}, curbuf('get_lines', 1, 2, true))
     nvim_feed('ggO+\027')
-    eq('+', curbuf('get_line', 0))
+    eq({'+'}, curbuf('get_lines', 0, 1, true))
     nvim_feed('GO*\027')
-    eq('  *', curbuf('get_line', 2))
+    eq({'  *'}, curbuf('get_lines', 2, 3, true))
     nvim_feed('ggO  /\027')
-    eq('  /', curbuf('get_line', 0))
+    eq({'  /'}, curbuf('get_lines', 0, 1, true))
     nvim_feed('ggOx\027')
-    eq('x', curbuf('get_line', 0))
+    eq({'x'}, curbuf('get_lines', 0, 1, true))
   end)
 end)
 
diff --git a/test/functional/shada/buffers_spec.lua b/test/functional/shada/buffers_spec.lua
index 6694e736dc..01952560d6 100644
--- a/test/functional/shada/buffers_spec.lua
+++ b/test/functional/shada/buffers_spec.lua
@@ -80,9 +80,9 @@ describe('ShaDa support code', function()
   it('does not dump unnamed buffers', function()
     set_additional_cmd('set shada+=% hidden')
     reset()
-    curbufmeths.set_line(0, 'foo')
+    curbufmeths.set_lines(0, 1, true, {'foo'})
     nvim_command('enew')
-    curbufmeths.set_line(0, 'bar')
+    curbufmeths.set_lines(0, 1, true, {'bar'})
     eq(2, funcs.bufnr('$'))
     nvim_command('qall!')
     reset()