runtime(vim): Update syntax, improve user-command matching

- Match -addr and -keepscript attributes and generate -addr values.
- Match attribute errors where = is specified.
- Highlight attributes with Special like other Ex command options.
- Don't highlight user-specified completion function args.
- Match :delcommand -buffer attribute.

closes: #15586

Signed-off-by: Doug Kearns <dougkearns@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

runtime/syntax/generator/gen_syntax_vim.vim

@@ -1,9 +1,7 @@
 " Vim syntax file generator
 " Language: Vim script
 " Maintainer: Hirohito Higashi (h_east)
-" URL: https://github.com/vim-jp/syntax-vim-ex
-" Last Change: 2024 Aug 23
-" Version: 2.1.1
+" Last Change: 2024 Aug 30
 
 let s:keepcpo= &cpo
 set cpo&vim
@@ -288,6 +286,7 @@ function! s:get_vim_command_type(cmd_name)
 		call
 		catch
 		def
+		delcommand
 		doautoall
 		doautocmd
 		echo
@@ -551,6 +550,44 @@ function! s:parse_vim_complete_name(li)
 	endtry
 endfunc
 
+" ------------------------------------------------------------------------------
+function! s:parse_vim_addr_name(li)
+	try
+		let file_name = $VIM_SRCDIR . '/usercmd.c'
+		let item = {}
+
+		new
+		exec 'read ' . file_name
+		norm! gg
+		exec '/^static addrtype_T addr_type_complete_tab\[] =$/+1;/^};$/-1yank'
+		%delete _
+
+		put
+		g!/^\s*ADDRTYPE_ENTRY(/d
+
+		for line in getline(1, line('$'))
+			let list = matchlist(line, '^\s*ADDRTYPE_ENTRY(ADDR_\w\+,\s*"\(\w\+\)",\s*"\(.*\)"')
+			let item.name = list[1]
+			call add(a:li, copy(item))
+			let item.name = list[2]
+			call add(a:li, copy(item))
+		endfor
+
+		" '?' is not in 'iskeyword' and cannot be used as keyword, so remove it.
+		" (Separately specified as 'syn match' in vim.vim.base).
+		call filter(a:li, {idx, val -> val.name !=# '?'})
+
+		quit!
+
+		if empty(a:li)
+			throw 'addr_name is empty'
+		endif
+	catch /.*/
+		call s:err_gen('')
+		throw 'exit'
+	endtry
+endfunc
+
 " ------------------------------------------------------------------------------
 function! s:append_syn_any(lnum, str_info, li)
 	let ret_lnum = a:lnum
@@ -658,7 +695,12 @@ function! s:update_syntax_vim_file(vim_info)
 
 		" vimUserAttrbCmplt
 		let li = a:vim_info.compl_name
-		let lnum = s:search_and_check('vimUserAttrbCmplt', base_fname, str_info)
+		let lnum = s:search_and_check('vimUserCmdAttrCmplt', base_fname, str_info)
+		let lnum = s:append_syn_any(lnum, str_info, li)
+
+		" vimUserAttrbAddr
+		let li = a:vim_info.addr_name
+		let lnum = s:search_and_check('vimUserCmdAttrAddr', base_fname, str_info)
 		let lnum = s:append_syn_any(lnum, str_info, li)
 
 		" vimCommand - abbrev
@@ -731,6 +773,7 @@ try
 	let s:vim_info.func = []
 	let s:vim_info.hlgroup = []
 	let s:vim_info.compl_name = []
+	let s:vim_info.addr_name = []
 
 	set lazyredraw
 	silent call s:parse_vim_option(s:vim_info.opt, s:vim_info.missing_opt,
@@ -740,6 +783,7 @@ try
 	silent call s:parse_vim_function(s:vim_info.func)
 	silent call s:parse_vim_hlgroup(s:vim_info.hlgroup)
 	silent call s:parse_vim_complete_name(s:vim_info.compl_name)
+	silent call s:parse_vim_addr_name(s:vim_info.addr_name)
 
 	call s:update_syntax_vim_file(s:vim_info)
 	set nolazyredraw