Preserve HTML Text for link render hooks

The context now have two text methods:

* Text - rendered
* PlainText

Fixes #6629

docs/content/en/getting-started/configuration-markup.md

@@ -117,7 +117,10 @@ Title
 : The title attribute.
 
 Text
-: The link text.
+: The rendered (HTML) link text.
+
+PlainText
+: The plain variant of the above.
 
 A Markdown example for a inline-style link with title:
 

hugolib/content_render_hooks_test.go

@@ -213,6 +213,37 @@ P3: <p>P3. xml-link: https://www.example.org|</p>
 
 }
 
+// https://github.com/gohugoio/hugo/issues/6629
+func TestRenderLinkWithMarkupInText(t *testing.T) {
+
+ b := newTestSitesBuilder(t)
+
+ b.WithTemplates("index.html", `
+{{ $p := site.GetPage "p1.md" }}
+P1: {{ $p.Content }}
+
+ `,
+ "_default/_markup/render-link.html", `html-link: {{ .Destination | safeURL }}|Text: {{ .Text | safeHTML }}|Plain: {{ .PlainText | safeHTML }}`,
+ )
+
+ b.WithContent("p1.md", `---
+title: "p1"
+---
+
+START: [**should be bold**](https://gohugo.io)END
+
+Some regular **markup**.
+`)
+
+ b.Build(BuildCfg{})
+
+ b.AssertFileContent("public/index.html", `
+ P1: <p>START: html-link: https://gohugo.io|Text: <strong>should be bold</strong>|Plain: should be boldEND</p>
+<p>Some regular <strong>markup</strong>.</p>
+`)
+
+}
+
 func TestRenderString(t *testing.T) {
 
  b := newTestSitesBuilder(t)

markup/converter/hooks/hooks.go

@@ -24,6 +24,7 @@ type LinkContext interface {
  Destination() string
  Title() string
  Text() string
+ PlainText() string
 }
 
 type Render struct {

markup/goldmark/convert.go

@@ -15,9 +15,9 @@
 package goldmark
 
 import (
- "bufio"
  "bytes"
  "fmt"
+ "math/bits"
  "path/filepath"
  "runtime/debug"
 
@@ -162,8 +162,27 @@ func (c converterResult) GetIdentities() identity.Identities {
  return c.ids
 }
 
+type bufWriter struct {
+ *bytes.Buffer
+}
+
+const maxInt = 1<<(bits.UintSize-1) - 1
+
+func (b *bufWriter) Available() int {
+ return maxInt
+}
+
+func (b *bufWriter) Buffered() int {
+ return b.Len()
+}
+
+func (b *bufWriter) Flush() error {
+ return nil
+}
+
 type renderContext struct {
- util.BufWriter
+ *bufWriter
+ pos int
  renderContextData
 }
 
@@ -205,7 +224,7 @@ func (c *goldmarkConverter) Convert(ctx converter.RenderContext) (result convert
  }
  }()
 
- buf := &bytes.Buffer{}
+ buf := &bufWriter{Buffer: &bytes.Buffer{}}
  result = buf
  pctx := newParserContext(ctx)
  reader := text.NewReader(ctx.Src)
@@ -221,8 +240,8 @@ func (c *goldmarkConverter) Convert(ctx converter.RenderContext) (result convert
  ids: identity.NewManager(converterIdentity),
  }
 
- w := renderContext{
- BufWriter: bufio.NewWriter(buf),
+ w := &renderContext{
+ bufWriter: buf,
  renderContextData: rcx,
  }
 

markup/goldmark/render_link.go

@@ -43,6 +43,7 @@ type linkContext struct {
  destination string
  title string
  text string
+ plainText string
 }
 
 func (ctx linkContext) Destination() string {
@@ -61,6 +62,10 @@ func (ctx linkContext) Text() string {
  return ctx.text
 }
 
+func (ctx linkContext) PlainText() string {
+ return ctx.plainText
+}
+
 func (ctx linkContext) Title() string {
  return ctx.title
 }
@@ -146,13 +151,16 @@ func (r *linkRenderer) renderImage(w util.BufWriter, source []byte, node ast.Nod
  return ast.WalkContinue, nil
  }
 
+ text := string(n.Text(source))
+
  err := h.ImageRenderer.Render(
  w,
  linkContext{
  page: ctx.DocumentContext().Document,
  destination: string(n.Destination),
  title: string(n.Title),
- text: string(n.Text(source)),
+ text: text,
+ plainText: text,
  },
  )
 
@@ -166,7 +174,7 @@ func (r *linkRenderer) renderLink(w util.BufWriter, source []byte, node ast.Node
  n := node.(*ast.Link)
  var h *hooks.Render
 
- ctx, ok := w.(renderContextData)
+ ctx, ok := w.(*renderContext)
  if ok {
  h = ctx.RenderContext().RenderHooks
  ok = h != nil && h.LinkRenderer != nil
@@ -176,24 +184,29 @@ func (r *linkRenderer) renderLink(w util.BufWriter, source []byte, node ast.Node
  return r.renderDefaultLink(w, source, node, entering)
  }
 
- if !entering {
+ if entering {
+ // Store the current pos so we can capture the rendered text.
+ ctx.pos = ctx.Buffer.Len()
  return ast.WalkContinue, nil
  }
 
+ text := ctx.Buffer.Bytes()[ctx.pos:]
+ ctx.Buffer.Truncate(ctx.pos)
+
  err := h.LinkRenderer.Render(
  w,
  linkContext{
  page: ctx.DocumentContext().Document,
  destination: string(n.Destination),
  title: string(n.Title),
- text: string(n.Text(source)),
+ text: string(text),
+ plainText: string(n.Text(source)),
  },
  )
 
  ctx.AddIdentity(h.LinkRenderer.GetIdentity())
 
- // Do not render the inner text.
- return ast.WalkSkipChildren, err
+ return ast.WalkContinue, err
 
 }