Make Markdown fenced code block work with more syntaxes (#37154)

modules/markup/markdown/transform_codeblock.go

@@ -0,0 +1,32 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package markdown
+
+import (
+	"github.com/yuin/goldmark/ast"
+	"github.com/yuin/goldmark/text"
+)
+
+func (g *ASTTransformer) transformFencedCodeblock(v *ast.FencedCodeBlock, reader text.Reader) {
+	// * Some engines support a meta syntax for appending the filename after the language, separated by a colon
+	//   * https://www.glukhov.org/documentation-tools/markdown/markdown-codeblocks/
+	// * Some engines support additional "options" after the language, separated by a space or comma: ```rust,ignore```
+	//   * https://docs.readme.com/rdmd/docs/code-blocks
+	//   * https://next-book.vercel.app/reference/fencedcode
+	if v.Info == nil {
+		return
+	}
+	info := v.Info.Segment.Value(reader.Source())
+	newEnd := -1
+	for i, b := range info {
+		if b == ' ' || b == ',' || b == ':' {
+			newEnd = i
+			break
+		}
+	}
+	if newEnd != -1 {
+		start := v.Info.Segment.Start
+		v.Info = ast.NewTextSegment(text.NewSegment(start, start+newEnd))
+	}
+}