runtime(forth): Update syntax and ftplugin files (#12976)
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/ftplugin/forth.vim b/runtime/ftplugin/forth.vim
new file mode 100644
index 0000000..5343784
--- /dev/null
+++ b/runtime/ftplugin/forth.vim
@@ -0,0 +1,71 @@
+" Vim filetype plugin
+" Language: Forth
+" Maintainer: Johan Kotlinski <kotlinski@gmail.com>
+" Last Change: 2023 Aug 08
+" URL: https://github.com/jkotlinski/forth.vim
+
+if exists("b:did_ftplugin")
+ finish
+endif
+let b:did_ftplugin = 1
+
+let s:cpo_save = &cpo
+set cpo&vim
+
+setlocal commentstring=\\\ %s
+setlocal comments=s:(,mb:\ ,e:),b:\\
+setlocal iskeyword=33-126,128-255
+
+let s:include_patterns =<< trim EOL
+
+ \<\%(INCLUDE\|REQUIRE\)\>\s\+\zs\k\+\ze
+ \<S"\s\+\zs[^"]*\ze"\s\+\%(INCLUDED\|REQUIRED\)\>
+EOL
+let &l:include = $'\c{ s:include_patterns[1:]->join('\|') }'
+
+let s:define_patterns =<< trim EOL
+ :
+ [2F]\=CONSTANT
+ [2F]\=VALUE
+ [2F]\=VARIABLE
+ BEGIN-STRUCTURE
+ BUFFER:
+ CODE
+ CREATE
+ MARKER
+ SYNONYM
+EOL
+let &l:define = $'\c\<\%({ s:define_patterns->join('\|') }\)'
+
+" assume consistent intra-project file extensions
+let &l:suffixesadd = "." .. expand("%:e")
+
+let b:undo_ftplugin = "setl cms< com< def< inc< isk< sua<"
+
+if exists("loaded_matchit") && !exists("b:match_words")
+ let s:matchit_patterns =<< trim EOL
+
+ \<\:\%(NONAME\)\=\>:\<EXIT\>:\<;\>
+ \<IF\>:\<ELSE\>:\<THEN\>
+ \<\[IF]\>:\<\[ELSE]\>:\<\[THEN]\>
+ \<?\=DO\>:\<LEAVE\>:\<+\=LOOP\>
+ \<CASE\>:\<ENDCASE\>
+ \<OF\>:\<ENDOF\>
+ \<BEGIN\>:\<WHILE\>:\<\%(AGAIN\|REPEAT\|UNTIL\)\>
+ \<CODE\>:\<END-CODE\>
+ \<BEGIN-STRUCTURE\>:\<END-STRUCTURE\>
+ EOL
+ let b:match_ignorecase = 1
+ let b:match_words = s:matchit_patterns[1:]->join(',')
+ let b:undo_ftplugin ..= "| unlet! b:match_ignorecase b:match_words"
+endif
+
+if (has("gui_win32") || has("gui_gtk")) && !exists("b:browsefilter")
+ let b:browsefilter = "Forth Source Files (*.f *.fs *.ft *.fth *.4th)\t*.f;*.fs;*.ft;*.fth;*.4th\n" ..
+ \ "All Files (*.*)\t*.*\n"
+ let b:undo_ftplugin ..= " | unlet! b:browsefilter"
+endif
+
+let &cpo = s:cpo_save
+unlet s:cpo_save
+unlet s:define_patterns s:include_patterns s:matchit_patterns