patch 9.1.0876: filetype: openCL files are not recognized

Problem:  filetype: openCL files are not recognized
Solution: detect '*.cl' files as opencl or lisp filetype,
          include a opencl syntax and filetype plugin (Wu, Zhenyu)

closes: #15825

Signed-off-by: Wu, Zhenyu <wuzhenyu@ustc.edu>
Signed-off-by: Christian Brabandt <cb@256bit.org>

runtime/autoload/dist/ft.vim

@@ -144,6 +144,14 @@ export def FTcfg()
   endif
 enddef
 
+export def FTcl()
+  if join(getline(1, 4), '') =~ '/\*'
+    setf opencl
+  else
+    setf lisp
+  endif
+enddef
+
 export def FTcls()
   if exists("g:filetype_cls")
     exe "setf " .. g:filetype_cls

runtime/filetype.vim

@@ -1365,14 +1365,17 @@ au BufNewFile,BufRead lilo.conf			setf lilo
 " Lilypond
 au BufNewFile,BufRead *.ly,*.ily		setf lilypond
 
-" Lisp (*.el = ELisp, *.cl = Common Lisp)
+" Lisp (*.el = ELisp)
 " *.jl was removed, it's also used for Julia, better skip than guess wrong.
 if has("fname_case")
-  au BufNewFile,BufRead *.lsp,*.lisp,*.asd,*.el,*.cl,*.L,.emacs,.sawfishrc,*.stsg,*/supertux2/config setf lisp
+  au BufNewFile,BufRead *.lsp,*.lisp,*.asd,*.el,*.L,.emacs,.sawfishrc,*.stsg,*/supertux2/config setf lisp
 else
-  au BufNewFile,BufRead *.lsp,*.lisp,*.asd,*.el,*.cl,.emacs,.sawfishrc,*.stsg,*/supertux2/config setf lisp
+  au BufNewFile,BufRead *.lsp,*.lisp,*.asd,*.el,.emacs,.sawfishrc,*.stsg,*/supertux2/config setf lisp
 endif
 
+" *.cl = Common Lisp or OpenCL
+au BufNewFile,BufRead *.cl call dist#ft#FTcl()
+
 " SBCL implementation of Common Lisp
 au BufNewFile,BufRead sbclrc,.sbclrc		setf lisp
 

runtime/ftplugin/opencl.vim

@@ -0,0 +1,12 @@
+" Vim filetype plugin file
+" Language:	OpenCL
+" Maintainer:	Wu, Zhenyu <wuzhenyu@ustc.edu>
+" Last Change:	2024 Nov 19
+
+if exists("b:did_ftplugin") | finish | endif
+let b:did_ftplugin = 1
+
+setlocal comments=sO:*\ -,mO:*\ \ ,exO:*/,s1:/*,mb:*,ex:*/,:///,://
+setlocal commentstring=/*\ %s\ */ define& include&
+
+let b:undo_ftplugin = "setl commentstring< comments<"

runtime/syntax/opencl.vim

@@ -0,0 +1,13 @@
+" Vim syntax file
+" Language:	OpenCL
+" Last Change:	2024 Nov 19
+" Maintainer:	Wu, Zhenyu <wuzhenyu@ustc.edu>
+
+if exists("b:current_syntax")
+  finish
+endif
+
+" TODO: support openCL specific keywords
+runtime! syntax/c.vim
+
+let current_syntax = "opencl"