Remove unused 'if_[language].txt': Clean up

Regarding |script-here|: despite being a language agnostic piece of
advice, it was in `if_perl.txt`. Regardless, we now only have one
support for one legacy plugin interface, so put it in `if_pyth.txt`

13 files changed, 27 insertions, 106 deletions

diff --git a/runtime/doc/Makefile b/runtime/doc/Makefile
index 4bced03d7e..e0d6e48cb9 100644
--- a/runtime/doc/Makefile
+++ b/runtime/doc/Makefile
@@ -34,12 +34,7 @@ DOCS = \
 	helphelp.txt \
 	howto.txt \
 	if_cscop.txt \
-	if_lua.txt \
-	if_mzsch.txt \
-	if_perl.txt \
 	if_pyth.txt \
-	if_ruby.txt \
-	if_tcl.txt \
 	indent.txt \
 	index.txt \
 	insert.txt \
@@ -156,12 +151,7 @@ HTMLS = \
 	helphelp.html \
 	howto.html \
 	if_cscop.html \
-	if_lua.html \
-	if_mzsch.html \
-	if_perl.html \
 	if_pyth.html \
-	if_ruby.html \
-	if_tcl.html \
 	indent.html \
 	index.html \
 	insert.html \
diff --git a/runtime/doc/cmdline.txt b/runtime/doc/cmdline.txt
index b426799239..da101e2dd1 100644
--- a/runtime/doc/cmdline.txt
+++ b/runtime/doc/cmdline.txt
@@ -522,8 +522,6 @@ followed by another Vim command:
     :lcscope
     :make
     :normal
-    :perl
-    :perldo
     :promptfind
     :promptrepl
     :pyfile
@@ -532,9 +530,6 @@ followed by another Vim command:
     :read !
     :scscope
     :sign
-    :tcl
-    :tcldo
-    :tclfile
     :vglobal
     :windo
     :write !
diff --git a/runtime/doc/eval.txt b/runtime/doc/eval.txt
index 710793fb04..6215756f08 100644
--- a/runtime/doc/eval.txt
+++ b/runtime/doc/eval.txt
@@ -1879,7 +1879,6 @@ lispindent( {lnum})		Number	Lisp indent for line {lnum}
 localtime()			Number	current time
 log( {expr})			Float	natural logarithm (base e) of {expr}
 log10( {expr})			Float	logarithm of Float {expr} to base 10
-luaeval( {expr}[, {expr}])	any	evaluate |Lua| expression
 map( {expr}, {string})		List/Dict  change each item in {expr} to {expr}
 maparg( {name}[, {mode} [, {abbr} [, {dict}]]])
 				String or Dict
@@ -1905,7 +1904,6 @@ min( {list})			Number	minimum value of items in {list}
 mkdir( {name} [, {path} [, {prot}]])
 				Number	create directory {name}
 mode( [expr])			String	current editing mode
-mzeval( {expr})			any	evaluate |MzScheme| expression
 nextnonblank( {lnum})		Number	line nr of non-blank line >= {lnum}
 nr2char( {expr}[, {utf8}])	String	single char with ASCII/UTF8 value {expr}
 or( {expr}, {expr})		Number  bitwise OR
@@ -4239,19 +4237,6 @@ log10({expr})						*log10()*
 <			-2.0
 
 
-luaeval({expr}[, {expr}])					*luaeval()*
-		Evaluate Lua expression {expr} and return its result converted 
-		to Vim data structures. Second {expr} may hold additional 
-		argument accessible as _A inside first {expr}.
-		Strings are returned as they are.
-		Boolean objects are converted to numbers.
-		Numbers are converted to |Float| values.
-		Dictionaries and lists obtained by vim.eval() are returned 
-		as-is.
-		Other objects are returned as zero without any errors.
-		See |lua-luaeval| for more details.
-		{only available when compiled with the |+lua| feature}
-
 map({expr}, {string})					*map()*
 		{expr} must be a |List| or a |Dictionary|.
 		Replace each item in {expr} with the result of evaluating
@@ -4615,23 +4600,6 @@ mode([expr])	Return a string that indicates the current mode.
 		"c" or "n".
 		Also see |visualmode()|.
 
-mzeval({expr})							*mzeval()*
-		Evaluate MzScheme expression {expr} and return its result
-		converted to Vim data structures.
-		Numbers and strings are returned as they are.
-		Pairs (including lists and improper lists) and vectors are
-		returned as Vim |Lists|.
-		Hash tables are represented as Vim |Dictionary| type with keys
-		converted to strings.
-		All other types are converted to string with display function.
-		Examples: >
-		    :mz (define l (list 1 2 3))
-		    :mz (define h (make-hash)) (hash-set! h "list" l)
-		    :echo mzeval("l")
-		    :echo mzeval("h")
-<
-		{only available when compiled with the |+mzscheme| feature}
-
 nextnonblank({lnum})					*nextnonblank()*
 		Return the line number of the first line at or below {lnum}
 		that is not blank.  Example: >
@@ -6773,7 +6741,6 @@ lispindent		Compiled with support for lisp indenting.
 listcmds		Compiled with commands for the buffer list |:files|
 			and the argument list |arglist|.
 localmap		Compiled with local mappings and abbr. |:map-local|
-lua			Compiled with Lua interface |Lua|.
 mac			Macintosh version of Vim.
 macunix			Macintosh version of Vim, using Unix files (OS-X).
 menu			Compiled with support for |:menu|.
@@ -6792,10 +6759,8 @@ multi_byte		Compiled with support for 'encoding'
 multi_byte_encoding	'encoding' is set to a multi-byte encoding.
 multi_byte_ime		Compiled with support for IME input method.
 multi_lang		Compiled with support for multiple languages.
-mzscheme		Compiled with MzScheme interface |mzscheme|.
 ole			Compiled with OLE automation support for Win32.
 path_extra		Compiled with up/downwards search in 'path' and 'tags'
-perl			Compiled with Perl interface.
 persistent_undo		Compiled with support for persistent undo history.
 postscript		Compiled with PostScript file printing.
 printer			Compiled with |:hardcopy| support.
@@ -6805,12 +6770,10 @@ python3			Compiled with Python 3.x interface. |has-python|
 quickfix		Compiled with |quickfix| support.
 reltime			Compiled with |reltime()| support.
 rightleft		Compiled with 'rightleft' support.
-ruby			Compiled with Ruby interface |ruby|.
 scrollbind		Compiled with 'scrollbind' support.
 showcmd			Compiled with 'showcmd' support.
 signs			Compiled with |:sign| support.
 smartindent		Compiled with 'smartindent' support.
-sniff			Compiled with SNiFF interface support.
 spell			Compiled with spell checking support |spell|.
 startuptime		Compiled with |--startuptime| support.
 statusline		Compiled with support for 'statusline', 'rulerformat'
@@ -6825,7 +6788,6 @@ tag_old_static		Compiled with support for old static tags
 			|tag-old-static|.
 tag_any_white		Compiled with support for any white characters in tags
 			files |tag-any-white|.
-tcl			Compiled with Tcl interface.
 terminfo		Compiled with terminfo instead of termcap.
 termresponse		Compiled with support for |t_RV| and |v:termresponse|.
 textobjects		Compiled with support for |text-objects|.
diff --git a/runtime/doc/help.txt b/runtime/doc/help.txt
index 34ca6d0d12..347c1310ff 100644
--- a/runtime/doc/help.txt
+++ b/runtime/doc/help.txt
@@ -156,12 +156,7 @@ GUI ~
 
 Interfaces ~
 |if_cscop.txt|	using Cscope with Vim
-|if_lua.txt|	Lua interface
-|if_mzsch.txt|	MzScheme interface
-|if_perl.txt|	Perl interface
 |if_pyth.txt|	Python interface
-|if_tcl.txt|	Tcl interface
-|if_ruby.txt|	Ruby interface
 |debugger.txt|	Interface with a debugger
 |sign.txt|	debugging signs
 
diff --git a/runtime/doc/if_pyth.txt b/runtime/doc/if_pyth.txt
index 4ed8eac742..c2d169283f 100644
--- a/runtime/doc/if_pyth.txt
+++ b/runtime/doc/if_pyth.txt
@@ -107,6 +107,29 @@ Here are some examples					*python-examples*  >
 (Note that changes - like the imports - persist from one command to the next,
 just like in the Python interpreter.)
 
+							*script-here*
+When using a script language in-line, you might want to skip this when the
+language isn't supported.  Note that this mechanism doesn't work:
+>
+   if has('python')
+     python << EOF
+       this will NOT work!
+   EOF
+   endif
+
+Instead, put the Python command in a function and call that function:
+>
+    if has('python')
+      function DefPython()
+        python << EOF
+          this works
+    EOF
+      endfunction
+      call DefPython()
+    endif
+
+Note that "EOF" must be at the start of the line.
+
 ==============================================================================
 2. The vim module					*python-vim*
 
diff --git a/runtime/doc/index.txt b/runtime/doc/index.txt
index 3eedb234f3..dfa4086488 100644
--- a/runtime/doc/index.txt
+++ b/runtime/doc/index.txt
@@ -1325,9 +1325,6 @@ tag	      command	      action ~
 |:ltag|		:lt[ag]		jump to tag and add matching tags to the
 				location list
 |:lunmap|	:lu[nmap]	like ":unmap!" but includes Lang-Arg mode
-|:lua|		:lua		execute |Lua| command
-|:luado|	:luad[o]	execute Lua command for each line
-|:luafile|	:luaf[ile]	execute |Lua| script file
 |:lvimgrep|	:lv[imgrep]	search for pattern in files
 |:lvimgrepadd|	:lvimgrepa[dd]	like :vimgrep, but append to current list
 |:lwindow|	:lw[indow]	open or close location window
@@ -1348,8 +1345,6 @@ tag	      command	      action ~
 |:mkvimrc|	:mkv[imrc]	write current mappings and settings to a file
 |:mkview|	:mkvie[w]	write view of current window to a file
 |:mode|		:mod[e]		show or change the screen mode
-|:mzscheme|	:mz[scheme]	execute MzScheme command
-|:mzfile|	:mzf[ile]	execute MzScheme script file
 |:next|		:n[ext]		go to next file in the argument list
 |:new|		:new		create a new empty window
 |:nmap|		:nm[ap]		like ":map" but for Normal mode
@@ -1382,13 +1377,11 @@ tag	      command	      action ~
 |:ownsyntax|	:ow[nsyntax]	set new local syntax highlight for this window
 |:pclose|	:pc[lose]	close preview window
 |:pedit|	:ped[it]	edit file in the preview window
-|:perl|		:pe[rl]		execute Perl command
 |:print|	:p[rint]	print lines
 |:profdel|	:profd[el]	stop profiling a function or script
 |:profile|	:prof[ile]	profiling functions and scripts
 |:promptfind|	:pro[mptfind]	open GUI dialog for searching
 |:promptrepl|	:promptr[epl]	open GUI dialog for search/replace
-|:perldo|	:perld[o]	execute Perl command for each line
 |:pop|		:po[p]		jump to older entry in tag stack
 |:popup|	:popu[p]	popup a menu by name
 |:ppop|		:pp[op]		":pop" in preview window
@@ -1429,9 +1422,6 @@ tag	      command	      action ~
 |:rewind|	:rew[ind]	go to the first file in the argument list
 |:right|	:ri[ght]	right align text
 |:rightbelow|	:rightb[elow]	make split window appear right or below
-|:ruby|		:rub[y]		execute Ruby command
-|:rubydo|	:rubyd[o]	execute Ruby command for each line
-|:rubyfile|	:rubyf[ile]	execute Ruby script file
 |:rundo|	:rund[o]	read undo information from a file
 |:runtime|	:ru[ntime]	source vim scripts in 'runtimepath'
 |:rviminfo|	:rv[iminfo]	read from viminfo file
@@ -1534,9 +1524,6 @@ tag	      command	      action ~
 |:tab|		:tab		create new tab when opening new window
 |:tag|		:ta[g]		jump to tag
 |:tags|		:tags		show the contents of the tag stack
-|:tcl|		:tc[l]		execute Tcl command
-|:tcldo|	:tcld[o]	execute Tcl command for each line
-|:tclfile|	:tclf[ile]	execute Tcl script file
 |:tearoff|	:te[aroff]	tear-off a menu
 |:tfirst|	:tf[irst]	jump to first matching tag
 |:throw|	:th[row]	throw an exception
diff --git a/runtime/doc/insert.txt b/runtime/doc/insert.txt
index c4c21f9175..0b9f958afc 100644
--- a/runtime/doc/insert.txt
+++ b/runtime/doc/insert.txt
@@ -1421,9 +1421,9 @@ automatically switch to HTML/CSS/JavaScript completion. Note: contrary to
 original HTML files completion of tags (and only tags) isn't context aware.
 
 
-RUBY							*ft-ruby-omni*
+RUBY						 {Nvim} *ft-ruby-omni*
 
-Completion of Ruby code requires that vim be built with |+ruby|.
+NOTE: Completion for ruby code is not currently provided by Nvim.
 
 Ruby completion will parse your buffer on demand in order to provide a list of
 completions.  These completions will be drawn from modules loaded by 'require'
@@ -1444,7 +1444,7 @@ The completions provided by CTRL-X CTRL-O are sensitive to the context:
 
 Notes:
  - Vim will load/evaluate code in order to provide completions.  This may
-   cause some code execution, which may be a concern. This is no longer 
+   cause some code execution, which may be a concern. This is no longer
    enabled by default, to enable this feature add >
      let g:rubycomplete_buffer_loading = 1
 <- In context 1 above, Vim can parse the entire buffer to add a list of
diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index fad6557eb0..6090dd6cb0 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -4953,15 +4953,6 @@ A jump table for the options with a short description can be found at |Q_op|.
 	time in msec between two mouse clicks for the second click to be
 	recognized as a multi click.
 
-						    *'mzquantum'* *'mzq'*
-'mzquantum' 'mzq'	number	(default 100)
-			global
-			{not in Vi}
-			{not available when compiled without the |+mzscheme|
-			feature}
-	The number of milliseconds between polls for MzScheme threads.
-	Negative or zero value means no thread scheduling.
-
 							*'nrformats'* *'nf'*
 'nrformats' 'nf'	string	(default "octal,hex")
 			local to buffer
diff --git a/runtime/doc/quickref.txt b/runtime/doc/quickref.txt
index 1554b823eb..5e0aa8021f 100644
--- a/runtime/doc/quickref.txt
+++ b/runtime/doc/quickref.txt
@@ -793,7 +793,6 @@ Short explanation of each option:		*option-list*
 'mousemodel'	  'mousem'  changes meaning of mouse buttons
 'mouseshape'	  'mouses'  shape of the mouse pointer in different modes
 'mousetime'	  'mouset'  max time between mouse double-click
-'mzquantum'	  'mzq'     the interval between polls for MzScheme threads
 'nrformats'	  'nf'	    number formats recognized for CTRL-A command
 'number'	  'nu'	    print the line number in front of each line
 'numberwidth'	  'nuw'     number of columns used for the line number
diff --git a/runtime/doc/todo.txt b/runtime/doc/todo.txt
index f66bc961f0..73dea6293d 100644
--- a/runtime/doc/todo.txt
+++ b/runtime/doc/todo.txt
@@ -849,8 +849,6 @@ Results in E670. (Tony Mechelynck, 2010 May 2)
 
 'beval' option should be global-local.
 
-Ruby: ":ruby print $buffer.number" returns zero.
-
 setpos() does not restore cursor position after :normal. (Tyru, 2010 Aug 11)
 
 7   The 'directory' option supports changing path separators to "%" to make
@@ -1186,8 +1184,6 @@ still delete them.  Also convert all buffer file names?
 
 Update src/testdir/main.aap.
 
-"vim -c 'sniff connect'" hangs Vim. (Dominique Pelle, 2008 Dec 7)
-
 Something wrong with session that has "cd" commands and "badd", in such a way
 that Vim doesn't find the edited file in the buffer list, causing the
 ATTENTION message?  (Tony Mechelynck, 2008 Dec 1)
@@ -1604,9 +1600,6 @@ error.  without --remote-silent it works fine. (Ben Fritz, 2008 Jun 20)
 Gvim: dialog for closing Vim should check if Vim is busy writing a file.  Then
 use a different dialog: "busy saving, really quit? yes / no".
 
-Check other interfaces for changing curbuf in a wrong way.  Patch like for
-if_ruby.c.
-
 ":helpgrep" should use the directory from 'helpfile'.
 
 The need_fileinfo flag is messy.  Instead make the message right away and put
@@ -2689,7 +2682,6 @@ Problems that will (probably) not be solved:
     XtOpenDisplay() prints this directly, there is no way to avoid it.
 -   X windows: Setting 'guifontset' to an illegal value sometimes crashes Vim.
     This is caused by a fault in a X library function, can't be solved in Vim.
--   Win32 tcl: has("tcl") hangs when the tcl84.dll is from cygwin.
 -   Motif: When adding a menu item "Find this &Symbol", the "s" in "this" will
     be underlined, instead of in "Symbol".  Motif doesn't let us specify which
     character gets the highlighting.
diff --git a/runtime/doc/usr_41.txt b/runtime/doc/usr_41.txt
index 4db0af07a5..90b4ba7a9d 100644
--- a/runtime/doc/usr_41.txt
+++ b/runtime/doc/usr_41.txt
@@ -914,8 +914,6 @@ Various:					*various-functions*
 	taglist()		get list of matching tags
 	tagfiles()		get a list of tags files
 
-	luaeval()		evaluate Lua expression
-	mzeval()		evaluate |MzScheme| expression
 	py3eval()		evaluate Python expression (|+python3|)
 	pyeval()		evaluate Python expression (|+python|)
 
diff --git a/runtime/doc/various.txt b/runtime/doc/various.txt
index d138fcf456..3f99f603bd 100644
--- a/runtime/doc/various.txt
+++ b/runtime/doc/various.txt
@@ -364,8 +364,6 @@ N  *+lispindent*	|'lisp'|
 N  *+listcmds*		Vim commands for the list of buffers |buffer-hidden|
 			and argument list |:argdelete|
 N  *+localmap*		Support for mappings local to a buffer |:map-local|
-m  *+lua*		|Lua| interface
-m  *+lua/dyn*		|Lua| interface |/dyn|
 N  *+menu*		|:menu|
 N  *+mksession*		|:mksession|
 N  *+modify_fname*	|filename-modifiers|
@@ -381,11 +379,7 @@ N  *+mouse_xterm*	Unix only: xterm mouse handling |xterm-mouse|
 N  *+multi_byte*	16 and 32 bit characters |multibyte|
    *+multi_byte_ime*	Win32 input method for multibyte chars |multibyte-ime|
 N  *+multi_lang*	non-English language support |multi-lang|
-m  *+mzscheme*		Mzscheme interface |mzscheme|
-m  *+mzscheme/dyn*	Mzscheme interface |mzscheme-dynamic| |/dyn|
 N  *+path_extra*	Up/downwards search in 'path' and 'tags'
-m  *+perl*		Perl interface |perl|
-m  *+perl/dyn*		Perl interface |perl-dynamic| |/dyn|
 N  *+persistent_undo*	Persistent undo |undo-persistence|
    *+postscript*	|:hardcopy| writes a PostScript file
 N  *+printer*		|:hardcopy| command
@@ -398,8 +392,6 @@ N  *+quickfix*		|:make| and |quickfix| commands
 N  *+reltime*		|reltime()| function, 'hlsearch'/'incsearch' timeout,
 			'redrawtime' option
 B  *+rightleft*		Right to left typing |'rightleft'|
-m  *+ruby*		Ruby interface |ruby|
-m  *+ruby/dyn*		Ruby interface |ruby-dynamic| |/dyn|
 N  *+scrollbind*	|'scrollbind'|
 B  *+signs*		|:sign|
 N  *+smartindent*	|'smartindent'|
@@ -411,8 +403,6 @@ N  *+syntax*		Syntax highlighting |syntax|
 N  *+tag_binary*	binary searching in tags file |tag-binary-search|
 N  *+tag_old_static*	old method for static tags |tag-old-static|
 m  *+tag_any_white*	any white space allowed in tags file |tag-any-white|
-m  *+tcl*		Tcl interface |tcl|
-m  *+tcl/dyn*		Tcl interface |tcl-dynamic| |/dyn|
    *+terminfo*		uses |terminfo| instead of termcap
 N  *+termresponse*	support for |t_RV| and |v:termresponse|
 N  *+textobjects*	|text-objects| selection
diff --git a/runtime/doc/vi_diff.txt b/runtime/doc/vi_diff.txt
index 9b1657fd09..7661652ac3 100644
--- a/runtime/doc/vi_diff.txt
+++ b/runtime/doc/vi_diff.txt
@@ -401,8 +401,7 @@ Scripts and Expressions.				|expression|
 	|:try|		Catch exceptions.
 	etc., etc.  See |eval|.
 	Debugging and profiling are supported. |debug-scripts| |profile|
-	If this is not enough, an interface is provided to |Python|, |Ruby|,
-	|Tcl|, |Lua|, |Perl| and |MzScheme|.
+	If this is not enough, an interface is provided to |Python|.
 
 Viminfo.						|viminfo-file|
 	The command-line history, marks and registers can be stored in a file