markup/goldmark: Apply Hugo Goldmark Extras when rendering TOC

Closes #12605

markup/goldmark/convert.go

@@ -102,9 +102,26 @@ func newMarkdown(pcfg converter.ProviderConfig) goldmark.Markdown {
 	if rendererOptions != nil {
 		copy(tocRendererOptions, rendererOptions)
 	}
+
 	tocRendererOptions = append(tocRendererOptions,
 		renderer.WithNodeRenderers(util.Prioritized(extension.NewStrikethroughHTMLRenderer(), 500)),
-		renderer.WithNodeRenderers(util.Prioritized(emoji.NewHTMLRenderer(), 200)))
+		renderer.WithNodeRenderers(util.Prioritized(emoji.NewHTMLRenderer(), 200)),
+	)
+
+	inlineTags := []extras.InlineTag{
+		extras.DeleteTag,
+		extras.InsertTag,
+		extras.MarkTag,
+		extras.SubscriptTag,
+		extras.SuperscriptTag,
+	}
+
+	for _, tag := range inlineTags {
+		tocRendererOptions = append(tocRendererOptions,
+			renderer.WithNodeRenderers(util.Prioritized(extras.NewInlineTagHTMLRenderer(tag), tag.RenderPriority)),
+		)
+	}
+
 	var (
 		extensions = []goldmark.Extender{
 			hugocontext.New(pcfg.Logger),

markup/goldmark/toc.go

@@ -23,6 +23,7 @@ import (
 
 	emojiAst "github.com/yuin/goldmark-emoji/ast"
 
+	"github.com/gohugoio/hugo-goldmark-extensions/extras"
 	"github.com/gohugoio/hugo/markup/tableofcontents"
 
 	"github.com/yuin/goldmark"
@@ -99,7 +100,12 @@ func (t *tocTransformer) Transform(n *ast.Document, reader text.Reader, pc parse
 			ast.KindImage,
 			ast.KindEmphasis,
 			strikethroughAst.KindStrikethrough,
-			emojiAst.KindEmoji:
+			emojiAst.KindEmoji,
+			extras.KindDelete,
+			extras.KindInsert,
+			extras.KindMark,
+			extras.KindSubscript,
+			extras.KindSuperscript:
 			err := t.r.Render(&headingText, reader.Source(), n)
 			if err != nil {
 				return s, err

markup/goldmark/toc_integration_test.go

@@ -14,6 +14,7 @@
 package goldmark_test
 
 import (
+	"strings"
 	"testing"
 
 	"github.com/gohugoio/hugo/hugolib"
@@ -303,3 +304,63 @@ title: home
 
 	b.AssertFileExists("public/index.html", true)
 }
+
+// Issue 12605
+func TestTableOfContentsWithGoldmarkExtras(t *testing.T) {
+	t.Parallel()
+
+	files := `
+-- hugo.toml --
+disableKinds = ['page','rss','section','sitemap','taxonomy','term']
+[markup.goldmark.extensions]
+strikethrough = false
+[markup.goldmark.extensions.extras.delete]
+enable = true
+[markup.goldmark.extensions.extras.insert]
+enable = true
+[markup.goldmark.extensions.extras.mark]
+enable = true
+[markup.goldmark.extensions.extras.subscript]
+enable = true
+[markup.goldmark.extensions.extras.superscript]
+enable = true
+
+-- content/_index.md --
+---
+title: home
+---
+## ~~deleted~~
+
+## ++inserted++
+
+## ==marked==
+
+## H~2~O
+
+## 1^st^
+-- layouts/home.html --
+{{ .TableOfContents }}
+`
+
+	b := hugolib.Test(t, files)
+
+	b.AssertFileContent("public/index.html",
+		`<li><a href="#deleted"><del>deleted</del></a></li>`,
+		`<li><a href="#inserted"><ins>inserted</ins></a></li>`,
+		`<li><a href="#marked"><mark>marked</mark></a></li>`,
+		`<li><a href="#h2o">H<sub>2</sub>O</a></li>`,
+		`<li><a href="#1st">1<sup>st</sup></a></li>`,
+	)
+
+	files = strings.ReplaceAll(files, "enable = true", "enable = false")
+
+	b = hugolib.Test(t, files)
+
+	b.AssertFileContent("public/index.html",
+		`<li><a href="#deleted">~~deleted~~</a></li>`,
+		`<li><a href="#inserted">++inserted++</a></li>`,
+		`<li><a href="#marked">==marked==</a></li>`,
+		`<li><a href="#h2o">H~2~O</a></li>`,
+		`<li><a href="#1st">1^st^</a></li>`,
+	)
+}