Repository: gohugoio/hugo (language: go)

Issue:
Issue with anchor logic in the new built-in link render hook
See https://discourse.gohugo.io/t/hugo-v0-123-0-broken-anchor-links/48382


```md

- This [broken link](#ergebnis-abspeichern) points to the root page of the site

Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. 
```

/cc @jmooring 



Discussion / hints:
Yeah, I've got the ball.

Fix patch:
diff --git a/tpl/tplimpl/embedded/templates/_default/_markup/render-link.html b/tpl/tplimpl/embedded/templates/_default/_markup/render-link.html
index bd64b204b35..cfc95ab3a2d 100644
--- a/tpl/tplimpl/embedded/templates/_default/_markup/render-link.html
+++ b/tpl/tplimpl/embedded/templates/_default/_markup/render-link.html
@@ -1,6 +1,8 @@
 {{- $u := urls.Parse .Destination -}}
 {{- $href := $u.String -}}
-{{- if not $u.IsAbs -}}
+{{- if strings.HasPrefix $u.String "#" }}
+  {{- $href = printf "%s#%s" .Page.RelPermalink $u.Fragment }}
+{{- else if not $u.IsAbs -}}
   {{- with or
     ($.Page.GetPage $u.Path)
     ($.Page.Resources.Get $u.Path)


Test patch:
diff --git a/tpl/tplimpl/render_hook_integration_test.go b/tpl/tplimpl/render_hook_integration_test.go
new file mode 100644
index 00000000000..607e06059cc
--- /dev/null
+++ b/tpl/tplimpl/render_hook_integration_test.go
@@ -0,0 +1,129 @@
+// Copyright 2024 The Hugo Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package tplimpl_test
+
+import (
+	"testing"
+
+	"github.com/gohugoio/hugo/hugolib"
+)
+
+func TestEmbeddedLinkRenderHook(t *testing.T) {
+	t.Parallel()
+
+	files := `
+-- hugo.toml --
+disableKinds = ['rss','sitemap','taxonomy','term']
+[markup.goldmark.renderHooks.link]
+enableDefault = true
+-- layouts/_default/list.html --
+{{ .Content }}
+-- layouts/_default/single.html --
+{{ .Content }}
+-- assets/a.txt --
+irrelevant
+-- content/_index.md --
+---
+title: home
+---
+-- content/s1/_index.md --
+---
+title: s1
+---
+-- content/s1/p1.md --
+---
+title: s1/p1
+---
+-- content/s1/p2/index.md --
+---
+title: s1/p2
+---
+[500](a.txt) // global resource
+[600](b.txt) // page resource
+-- content/s1/p2/b.txt --
+irrelevant
+-- content/s1/p3.md --
+---
+title: s1/p3
+---
+// Remote
+[10](https://a.org)
+
+// fragment
+[100](/#foo)
+[110](#foo)
+[120](p1#foo)
+[130](p1/#foo)
+
+// section page
+[200](s1)
+[210](/s1)
+[220](../s1)
+[230](s1/)
+[240](/s1/)
+[250](../s1/)
+
+// regular page
+[300](p1)
+[310](/s1/p1)
+[320](../s1/p1)
+[330](p1/)
+[340](/s1/p1/)
+[350](../s1/p1/)
+
+// leaf bundle
+[400](p2)
+[410](/s1/p2)
+[420](../s1/p2)
+[430](p2/)
+[440](/s1/p2/)
+[450](../s1/p2/)
+`
+
+	b := hugolib.Test(t, files)
+
+	b.AssertFileContent("public/s1/p3/index.html",
+		`<a href="https://a.org">10</a>`,
+		`<a href="/#foo">100</a>`,
+		`<a href="/s1/p3/#foo">110</a>`,
+		`<a href="/s1/p1/#foo">120</a>`,
+		`<a href="/s1/p1/#foo">130</a>`,
+
+		`<a href="/s1/">200</a>`,
+		`<a href="/s1/">210</a>`,
+		`<a href="/s1/">220</a>`,
+		`<a href="/s1/">230</a>`,
+		`<a href="/s1/">240</a>`,
+		`<a href="/s1/">250</a>`,
+
+		`<a href="/s1/p1/">300</a>`,
+		`<a href="/s1/p1/">310</a>`,
+		`<a href="/s1/p1/">320</a>`,
+		`<a href="/s1/p1/">330</a>`,
+		`<a href="/s1/p1/">340</a>`,
+		`<a href="/s1/p1/">350</a>`,
+
+		`<a href="/s1/p2/">400</a>`,
+		`<a href="/s1/p2/">410</a>`,
+		`<a href="/s1/p2/">420</a>`,
+		`<a href="/s1/p2/">430</a>`,
+		`<a href="/s1/p2/">440</a>`,
+		`<a href="/s1/p2/">450</a>`,
+	)
+
+	b.AssertFileContent("public/s1/p2/index.html",
+		`<a href="/a.txt">500</a>`,
+		`<a href="/s1/p2/b.txt">600</a>`,
+	)
+}