runtime(java): Quietly opt out for unsupported markdown.vim versions

fixes #16349
closes: #16369

Signed-off-by: Aliaksei Budavei <32549825+zzzyxwvut@users.noreply.github.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

diff --git a/runtime/syntax/java.vim b/runtime/syntax/java.vim
index b3e17b55f61bc0a8113a42fa832abd0a4509d377..9b38ccd4dc77015a86a608a7d185c9327a408241 100644 (file)
--- a/runtime/syntax/java.vim
+++ b/runtime/syntax/java.vim
@@ -3,7 +3,7 @@
 " Maintainer:          Aliaksei Budavei <0x000c70 AT gmail DOT com>
 " Former Maintainer:   Claudio Fleiner <claudio@fleiner.com>
 " Repository:          https://github.com/zzzyxwvut/java-vim.git
-" Last Change:         2024 Oct 10
+" Last Change:         2025 Jan 02
 
 " Please check ":help java.vim" for comments on some of the options
 " available.
@@ -391,18 +391,32 @@ if !exists("g:java_ignore_javadoc") && (s:with_html || s:with_markdown) && g:mai
   if s:with_markdown
     try
       syntax include @javaMarkdown syntax/markdown.vim
-      let s:ff.WithMarkdown = s:ff.LeftConstant
+
+      try
+       syn clear markdownId markdownLineStart markdownH1 markdownH2 markdownHeadingRule markdownRule markdownCode markdownCodeBlock markdownIdDeclaration
+       let s:ff.WithMarkdown = s:ff.LeftConstant
+      catch /\<E28:/
+       call s:ReportOnce(v:exception)
+       let s:no_support = 1
+       unlet! g:java_ignore_markdown
+       let g:java_ignore_markdown = 28
+      endtry
     catch /\<E48[45]:/
       call s:ReportOnce(v:exception)
-      unlockvar s:with_markdown
-      let s:with_markdown = 0
-      lockvar s:with_markdown
-      hi clear markdownCode
-      hi clear markdownCodeBlock
-      hi clear markdownCodeDelimiter
-      hi clear markdownLinkDelimiter
+      let s:no_support = 1
     finally
       unlet! b:current_syntax
+
+      if exists("s:no_support")
+       unlet s:no_support
+       unlockvar s:with_markdown
+       let s:with_markdown = 0
+       lockvar s:with_markdown
+       hi clear markdownCode
+       hi clear markdownCodeBlock
+       hi clear markdownCodeDelimiter
+       hi clear markdownLinkDelimiter
+      endif
     endtry
   endif
 
@@ -422,7 +436,6 @@ if !exists("g:java_ignore_javadoc") && (s:with_html || s:with_markdown) && g:mai
     exec 'syn region javaMarkdownCommentTitle contained matchgroup=javaMarkdownComment start="\%(///.*\r\=\n\s*\)\@' . s:ff.Peek('80', '') . '<!///\s*\%({@return\>\)\@=" matchgroup=javaMarkdownCommentTitle end="}\%(\s*\.*\)*" contains=javaMarkdownShortcutLink,@javaMarkdown,javaMarkdownCommentMask,javaTodo,@Spell,@javaDocTags,javaTitleSkipBlock'
     exec 'syn region javaMarkdownCommentTitle contained matchgroup=javaMarkdownComment start="\%(///.*\r\=\n\s*\)\@' . s:ff.Peek('80', '') . '<!///\s*\%({@summary\>\)\@=" matchgroup=javaMarkdownCommentTitle end="}" contains=javaMarkdownShortcutLink,@javaMarkdown,javaMarkdownCommentMask,javaTodo,@Spell,@javaDocTags,javaTitleSkipBlock'
 
-    syn clear markdownId markdownLineStart markdownH1 markdownH2 markdownHeadingRule markdownRule markdownCode markdownCodeBlock markdownIdDeclaration
     " REDEFINE THE MARKDOWN ITEMS ANCHORED WITH "^", OBSERVING THE
     " DEFINITION ORDER.
     syn match markdownLineStart                contained "^\s*///\s*[<@]\@!" contains=@markdownBlock,javaMarkdownCommentTitle,javaMarkdownCommentMask nextgroup=@markdownBlock,htmlSpecialChar