markup/goldmark: TOC: render strikethrough, emojis

Configure the TOC (TableOfContents, toc.go) goldmark renderer to always
enable the Strikethrough and Emoji extensions. This allows handling
ast.KindStrikethrough and ast.KindEmoji AST nodes when rendering the TOC.

Fixes #7169
Fixes #11783
Fixes #12022

markup/goldmark/convert.go

@@ -18,14 +18,14 @@ import (
 	"bytes"
 
 	"github.com/gohugoio/hugo-goldmark-extensions/passthrough"
+	"github.com/yuin/goldmark/util"
+
 	"github.com/gohugoio/hugo/markup/goldmark/codeblocks"
 	"github.com/gohugoio/hugo/markup/goldmark/goldmark_config"
 	"github.com/gohugoio/hugo/markup/goldmark/images"
 	"github.com/gohugoio/hugo/markup/goldmark/internal/extensions/attributes"
 	"github.com/gohugoio/hugo/markup/goldmark/internal/render"
 
-	"github.com/gohugoio/hugo/markup/converter"
-	"github.com/gohugoio/hugo/markup/tableofcontents"
 	"github.com/yuin/goldmark"
 	emoji "github.com/yuin/goldmark-emoji"
 	"github.com/yuin/goldmark/ast"
@@ -34,6 +34,9 @@ import (
 	"github.com/yuin/goldmark/renderer"
 	"github.com/yuin/goldmark/renderer/html"
 	"github.com/yuin/goldmark/text"
+
+	"github.com/gohugoio/hugo/markup/converter"
+	"github.com/gohugoio/hugo/markup/tableofcontents"
 )
 
 const (
@@ -91,10 +94,17 @@ func newMarkdown(pcfg converter.ProviderConfig) goldmark.Markdown {
 		rendererOptions = append(rendererOptions, html.WithUnsafe())
 	}
 
+	tocRendererOptions := make([]renderer.Option, len(rendererOptions))
+	if rendererOptions != nil {
+		copy(tocRendererOptions, rendererOptions)
+	}
+	tocRendererOptions = append(tocRendererOptions,
+		renderer.WithNodeRenderers(util.Prioritized(extension.NewStrikethroughHTMLRenderer(), 500)),
+		renderer.WithNodeRenderers(util.Prioritized(emoji.NewHTMLRenderer(), 200)))
 	var (
 		extensions = []goldmark.Extender{
 			newLinks(cfg),
-			newTocExtension(rendererOptions),
+			newTocExtension(tocRendererOptions),
 		}
 		parserOptions []parser.Option
 	)

markup/goldmark/toc.go

@@ -16,6 +16,10 @@ package goldmark
 import (
 	"bytes"
 
+	strikethroughAst "github.com/yuin/goldmark/extension/ast"
+
+	emojiAst "github.com/yuin/goldmark-emoji/ast"
+
 	"github.com/gohugoio/hugo/markup/tableofcontents"
 
 	"github.com/yuin/goldmark"
@@ -86,7 +90,9 @@ func (t *tocTransformer) Transform(n *ast.Document, reader text.Reader, pc parse
 			ast.KindCodeSpan,
 			ast.KindLink,
 			ast.KindImage,
-			ast.KindEmphasis:
+			ast.KindEmphasis,
+			strikethroughAst.KindStrikethrough,
+			emojiAst.KindEmoji:
 			err := t.r.Render(&headingText, reader.Source(), n)
 			if err != nil {
 				return s, err

markup/goldmark/toc_integration_test.go

@@ -253,14 +253,12 @@ title: p7 (emoji)
 `)
 
 	// strikethrough
-	// TODO failing test: Issue #8087
-	// 	b.AssertFileContent("public/p6/index.html", `
-	// <li><a href="#ome-deleted-text">Some <del>deleted</del> text</a></li>
-	// 	`)
+	b.AssertFileContent("public/p6/index.html", `
+<li><a href="#some-deleted-text">Some <del>deleted</del> text</a></li>
+`)
 
 	// emoji
-	// TODO failing test: Issue #12022
-	// 	b.AssertFileContent("public/p7/index.html", `
-	// <li><a href="#a-snake-emoji">A &#x1f40d; emoji</a></li>
-	// 		`)
+	b.AssertFileContent("public/p7/index.html", `
+<li><a href="#a-snake-emoji">A &#x1f40d; emoji</a></li>
+`)
 }