markup/goldmark: Make auto IDs GitHub compatible

You can turn off this behaviour:

```toml
[markup]
  [markup.goldmark]
    [markup.goldmark.parser]
      autoHeadingIDAsciiOnly = true
```
Note that the `anchorize` now adapts its behaviour depending on the default Markdown handler.

Fixes #6616

1 files changed, 17 insertions, 3 deletions

diff --git a/markup/goldmark/convert.go b/markup/goldmark/convert.go
index af204125f..7d50839e2 100644
--- a/markup/goldmark/convert.go
+++ b/markup/goldmark/convert.go
@@ -50,19 +50,33 @@ type provide struct {
 
 func (p provide) New(cfg converter.ProviderConfig) (converter.Provider, error) {
 	md := newMarkdown(cfg)
+
 	return converter.NewProvider("goldmark", func(ctx converter.DocumentContext) (converter.Converter, error) {
 		return &goldmarkConverter{
 			ctx: ctx,
 			cfg: cfg,
 			md:  md,
+			sanitizeAnchorName: func(s string) string {
+				return sanitizeAnchorNameString(s, cfg.MarkupConfig.Goldmark.Parser.AutoHeadingIDAsciiOnly)
+			},
 		}, nil
 	}), nil
 }
 
+var (
+	_ converter.AnchorNameSanitizer = (*goldmarkConverter)(nil)
+)
+
 type goldmarkConverter struct {
 	md  goldmark.Markdown
 	ctx converter.DocumentContext
 	cfg converter.ProviderConfig
+
+	sanitizeAnchorName func(s string) string
+}
+
+func (c *goldmarkConverter) SanitizeAnchorName(s string) string {
+	return c.sanitizeAnchorName(s)
 }
 
 func newMarkdown(pcfg converter.ProviderConfig) goldmark.Markdown {
@@ -226,7 +240,7 @@ func (c *goldmarkConverter) Convert(ctx converter.RenderContext) (result convert
 
 	buf := &bufWriter{Buffer: &bytes.Buffer{}}
 	result = buf
-	pctx := newParserContext(ctx)
+	pctx := c.newParserContext(ctx)
 	reader := text.NewReader(ctx.Src)
 
 	doc := c.md.Parser().Parse(
@@ -265,8 +279,8 @@ func (c *goldmarkConverter) Supports(feature identity.Identity) bool {
 	return featureSet[feature.GetIdentity()]
 }
 
-func newParserContext(rctx converter.RenderContext) *parserContext {
-	ctx := parser.NewContext()
+func (c *goldmarkConverter) newParserContext(rctx converter.RenderContext) *parserContext {
+	ctx := parser.NewContext(parser.WithIDs(newIDFactory(c.cfg.MarkupConfig.Goldmark.Parser.AutoHeadingIDAsciiOnly)))
 	ctx.Set(tocEnableKey, rctx.RenderTOC)
 	return &parserContext{
 		Context: ctx,