Add autoID for definition terms

Fixes #13403
See #11566

Co-authored-by: Joe Mooring <joe@mooring.com>

markup/goldmark/internal/extensions/attributes/attributes_integration_test.go

@@ -0,0 +1,74 @@
+package attributes_test
+
+import (
+	"testing"
+
+	"github.com/gohugoio/hugo/hugolib"
+)
+
+func TestDescriptionListAutoID(t *testing.T) {
+	t.Parallel()
+
+	files := `
+-- hugo.toml --
+[markup.goldmark.parser]
+autoHeadingID = true
+autoDefinitionTermID = true
+autoIDType = 'github-ascii'
+-- content/p1.md --
+---
+title: "Title"
+---
+
+## Title with id set {#title-with-id}
+
+## Title with id set duplicate {#title-with-id}
+
+## My Title
+
+Base Name
+: Base name of the file.
+
+Base Name
+: Duplicate term name.
+
+My Title
+: Term with same name as title.
+
+Foo@Bar
+: The foo bar.
+
+foo [something](/a/b/) bar
+: A foo bar.
+
+良善天父
+: The good father.
+
+Ā ā Ă ă Ą ą Ć ć Ĉ ĉ Ċ ċ Č č Ď
+: Testing accents.
+
+Mutiline set text header
+Second line
+---------------
+
+-- layouts/_default/single.html --
+{{ .Content }}|Identifiers: {{ .Fragments.Identifiers }}|
+`
+
+	b := hugolib.Test(t, files)
+
+	b.AssertFileContent("public/p1/index.html",
+		`<dt id="base-name">Base Name</dt>`,
+		`<dt id="base-name-1">Base Name</dt>`,
+		`<dt id="foobar">Foo@Bar</dt>`,
+		`<h2 id="my-title">My Title</h2>`,
+		`<dt id="foo-something-bar">foo <a href="/a/b/">something</a> bar</dt>`,
+		`<h2 id="title-with-id">Title with id set</h2>`,
+		`<h2 id="title-with-id">Title with id set duplicate</h2>`,
+		`<dt id="my-title-1">My Title</dt>`,
+		`<dt id="term">良善天父</dt>`,
+		`<dt id="a-a-a-a-a-a-c-c-c-c-c-c-c-c-d">Ā ā Ă ă Ą ą Ć ć Ĉ ĉ Ċ ċ Č č Ď</dt>`,
+		`<h2 id="second-line">Mutiline set text header`,
+		"|Identifiers: [a-a-a-a-a-a-c-c-c-c-c-c-c-c-d base-name base-name-1 foo-something-bar foobar my-title my-title-1 second-line term title-with-id title-with-id]|",
+	)
+}