runtime(vim): Update base-syntax, improve :echo and :execute highlighting (#14199)

Improve :echo and :execute highlighting.

- Add better line-continuation support for both commands.
- Improve the :execute command's expression argument matching.
- Remove the fix for issue #9987 as this is now handled by correctly
  matching the parens in :echo (...) as operator parens.


Signed-off-by: Doug Kearns <dougkearns@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/syntax/generator/gen_syntax_vim.vim b/runtime/syntax/generator/gen_syntax_vim.vim
index 1aa55f4..5c797de 100644
--- a/runtime/syntax/generator/gen_syntax_vim.vim
+++ b/runtime/syntax/generator/gen_syntax_vim.vim
@@ -2,8 +2,8 @@
 " Language: Vim script
 " Maintainer: Hirohito Higashi (h_east)
 " URL: https://github.com/vim-jp/syntax-vim-ex
-" Last Change: 2024 Mar 09
-" Version: 2.0.5
+" Last Change: 2024 Mar 14
+" Version: 2.0.6
 
 let s:keepcpo= &cpo
 set cpo&vim
@@ -264,23 +264,21 @@
 	" Return value:
 	"   0: normal
 	"   1: (Reserved)
-	"   2: abbrev
-	"   3: echo
-	"   4: menu
-	"   5: map
-	"   6: mapclear
-	"   7: unmap
+	"   2: abbrev (without un)
+	"   3: menu
+	"   4: map
+	"   5: mapclear
+	"   6: unmap
 	"   99: (Exclude registration of "syn keyword")
 	let menu_prefix = '^\%([acinostvx]\?\|tl\)'
 	let map_prefix  = '^[acilnostvx]\?'
-	let echo_suffix = '\%(n\|hl\|msg\|window\|err\|console\|\)$'
 	let exclude_list = [
 	\	'map', 'mapclear',
 	\	'substitute', 'smagic', 'snomagic',
 	\	'setlocal', 'setglobal', 'set', 'var',
 	\	'autocmd', 'augroup', 'doautocmd', 'doautoall',
-	\	'echohl',
-	\ 'execute',
+	\	'echo', 'echoconsole', 'echoerr', 'echohl', 'echomsg', 'echon', 'echowindow',
+	\	'execute',
 	\	'behave', 'augroup', 'normal', 'syntax',
 	\	'append', 'insert',
 	\	'Next', 'Print', 'X',
@@ -293,16 +291,14 @@
 		let ret = 99
 	elseif a:cmd_name =~# '^\%(\%(un\)\?abbreviate\|noreabbrev\|\l\%(nore\|un\)\?abbrev\)$'
 		let ret = 2
-	elseif a:cmd_name =~# '^echo' . echo_suffix
-		let ret = 3
 	elseif a:cmd_name =~# menu_prefix . '\%(nore\|un\)\?menu$'
-		let ret = 4
+		let ret = 3
 	elseif a:cmd_name =~# map_prefix . '\%(nore\)\?map$'
-		let ret = 5
+		let ret = 4
 	elseif a:cmd_name =~# map_prefix . 'mapclear$'
-		let ret = 6
+		let ret = 5
 	elseif a:cmd_name =~# map_prefix . 'unmap$'
-		let ret = 7
+		let ret = 6
 	else
 		let ret = 0
 	endif
@@ -621,19 +617,16 @@
 		let li = a:vim_info.cmd
 		let lnum = s:search_and_check(kword . ' abbrev', base_fname, str_info)
 		let lnum = s:append_syn_vimcmd(lnum, str_info, li, 2)
-		" vimCommand - echo
-		let lnum = s:search_and_check(kword . ' echo', base_fname, str_info)
-		let lnum = s:append_syn_vimcmd(lnum, str_info, li, 3)
-		" vimCommand - menu
-		let lnum = s:search_and_check(kword . ' menu', base_fname, str_info)
-		let lnum = s:append_syn_vimcmd(lnum, str_info, li, 4)
 		" vimCommand - map
 		let lnum = s:search_and_check(kword . ' map', base_fname, str_info)
-		let lnum = s:append_syn_vimcmd(lnum, str_info, li, 5)
+		let lnum = s:append_syn_vimcmd(lnum, str_info, li, 4)
 		let lnum = s:search_and_check(kword . ' mapclear', base_fname, str_info)
-		let lnum = s:append_syn_vimcmd(lnum, str_info, li, 6)
+		let lnum = s:append_syn_vimcmd(lnum, str_info, li, 5)
 		let lnum = s:search_and_check(kword . ' unmap', base_fname, str_info)
-		let lnum = s:append_syn_vimcmd(lnum, str_info, li, 7)
+		let lnum = s:append_syn_vimcmd(lnum, str_info, li, 6)
+		" vimCommand - menu
+		let lnum = s:search_and_check(kword . ' menu', base_fname, str_info)
+		let lnum = s:append_syn_vimcmd(lnum, str_info, li, 3)
 
 		update
 		quit!
diff --git a/runtime/syntax/generator/vim.vim.base b/runtime/syntax/generator/vim.vim.base
index d259058..2d9a2d3 100644
--- a/runtime/syntax/generator/vim.vim.base
+++ b/runtime/syntax/generator/vim.vim.base
@@ -167,7 +167,7 @@
 syn case match
 
 " All vimCommands are contained by vimIsCommand. {{{2
-syn cluster vimCmdList	contains=vimAbb,vimAddress,vimAutoCmd,vimAugroup,vimBehave,vimEcho,vimEchoHL,vimExecute,vimIsCommand,vimExtCmd,vimFunction,vimGlobal,vimHighlight,vimLet,vimMap,vimMark,vimNotFunc,vimNorm,vimSet,vimSyntax,vimUnlet,vimUnmap,vimUserCmd,vimMenu,vimMenutranslate
+syn cluster vimCmdList	contains=vimAbb,vimAddress,vimAutoCmd,vimAugroup,vimBehave,@vimEcho,vimExecute,vimIsCommand,vimExtCmd,vimFunction,vimGlobal,vimHighlight,vimLet,vimMap,vimMark,vimNotFunc,vimNorm,vimSet,vimSyntax,vimUnlet,vimUnmap,vimUserCmd,vimMenu,vimMenutranslate
 syn match vimCmdSep	"[:|]\+"	skipwhite nextgroup=@vimCmdList,vimSubst1
 syn match vimIsCommand	"\<\%(\h\w*\|[23]mat\%[ch]\)\>"	contains=vimCommand
 syn match vimVar	      contained	"\<\h[a-zA-Z0-9#_]*\>"
@@ -450,15 +450,27 @@
 
 " Echo And Execute: -- prefer strings! {{{2
 " ================
-" GEN_SYN_VIM: vimCommand echo, START_STR='syn keyword vimEcho', END_STR='skipwhite nextgroup=vimEchoExpr'
-syn region	vimEchoExpr 	contained	start="[^[:space:]|]" skip=+\\\\\|\\|\|\n\s*\\\|\n\s*"\\ + matchgroup=vimCmdSep end="|" end="$" contains=@vimContinue,@vimExprList
+" NOTE: No trailing comments
 
-syn match	vimEchoHL	"\<echohl\=\>"	skipwhite nextgroup=vimGroup,vimHLGroup,vimEchoHLNone
+syn region	vimEcho
+      \ matchgroup=vimCommand
+      \ start="\<ec\%[ho]\>"
+      \ start="\<echoe\%[rr]\>"
+      \ start="\<echom\%[sg]\>"
+      \ start="\<echoc\%[onsole]\>"
+      \ start="\<echon\>"
+      \ start="\<echow\%[indow]\>"
+      \ skip=+\\|\|\n\s*\\\|\n\s*"\\ +
+      \ matchgroup=vimCmdSep end="|" excludenl end="$" contains=@vimContinue,@vimExprList transparent
+
+syn match	vimEchohl	"\<echohl\=\>"	skipwhite nextgroup=vimGroup,vimHLGroup,vimEchohlNone
 syn case ignore
-syn keyword	vimEchoHLNone	none
+syn keyword	vimEchohlNone	contained none
 syn case match
 
-syn region	vimExecute	oneline excludenl matchgroup=vimCommand start="\<exe\%[cute]\>" skip="\(\\\\\)*\\|" end="$\||\|<[cC][rR]>" contains=vimFuncVar,vimIsCommand,vimOper,vimNotation,vimOperParen,vimString,vimVar
+syn cluster	vimEcho	contains=vimEcho.*
+
+syn region	vimExecute	matchgroup=vimCommand start="\<exe\%[cute]\>" skip=+\\|\|\n\s*\\\|\n\s*"\\ + matchgroup=vimCmdSep end="|" excludenl end="$" contains=@vimContinue,@vimExprList transparent
 
 " Maps: {{{2
 " ====
@@ -529,9 +541,8 @@
 " User Function Highlighting: {{{2
 " (following Gautam Iyer's suggestion)
 " ==========================
-syn match vimFunc		"\%(\%([sSgGbBwWtTlL]:\|<[sS][iI][dD]>\)\=\%(\w\+\.\)*\I[a-zA-Z0-9_.]*\)\ze\s*("		contains=vimFuncEcho,vimFuncName,vimUserFunc,vimExecute
+syn match vimFunc		"\%(\%([sSgGbBwWtTlL]:\|<[sS][iI][dD]>\)\=\%(\w\+\.\)*\I[a-zA-Z0-9_.]*\)\ze\s*("		contains=vimFuncName,vimUserFunc,vimExecute
 syn match vimUserFunc contained	"\%(\%([sSgGbBwWtTlL]:\|<[sS][iI][dD]>\)\=\%(\w\+\.\)*\I[a-zA-Z0-9_.]*\)\|\<\u[a-zA-Z0-9.]*\>\|\<if\>"	contains=vimNotation
-syn keyword vimFuncEcho contained	ec ech echo
 
 " User Command Highlighting: {{{2
 syn match vimUsrCmd	'^\s*\zs\u\%(\w*\)\@>\%([(#[]\|\s\+\%([-+*/%]\=\|\.\.\)=\)\@!'
@@ -971,8 +982,8 @@
  hi def link vimContinueComment	vimComment
  hi def link vimCtrlChar	SpecialChar
  hi def link vimEcho	vimCommand
- hi def link vimEchoHLNone	vimGroup
- hi def link vimEchoHL	vimCommand
+ hi def link vimEchohlNone	vimGroup
+ hi def link vimEchohl	vimCommand
  hi def link vimElseIfErr	Error
  hi def link vimElseif	vimCondHL
  hi def link vimEnvvar	PreProc