MediaWiki writer: use syntaxhighlight tag...

instead of deprecated source, for highlighted code.

Also support `startFrom` attribute and `numberLines`.

Closes #6810.

src/Text/Pandoc/Writers/MediaWiki.hs

@@ -135,15 +135,22 @@ blockToMediaWiki (Header level _ inlines) = do
   let eqs = T.replicate level "="
   return $ eqs <> " " <> contents <> " " <> eqs <> "\n"
 
-blockToMediaWiki (CodeBlock (_,classes,_) str) = do
+blockToMediaWiki (CodeBlock (_,classes,keyvals) str) = do
   let at  = Set.fromList classes `Set.intersection` highlightingLangs
+  let numberLines = any (`elem` ["number","numberLines", "number-lines"])
+                    classes
+  let start = lookup "startFrom" keyvals
   return $
     case Set.toList at of
        [] -> "<pre" <> (if null classes
                            then ">"
                            else " class=\"" <> T.unwords classes <> "\">") <>
              escapeText str <> "</pre>"
-       (l:_) -> "<source lang=\"" <> l <> "\">" <> str <> "</source>"
+       (l:_) -> "<syntaxhighlight lang=\"" <> l <> "\"" <>
+                (if numberLines then " line" else "") <>
+                maybe "" (\x -> " start=\"" <> x <> "\"") start <>
+                ">" <> str <>
+                "</syntaxhighlight>"
             -- note:  no escape!  even for <!
 
 blockToMediaWiki (BlockQuote blocks) = do