don't post-proccess issue index in documents

- Currently the post processing will transform all issue indexes (such
as  `#6`) into an clickable link.
- This makes sense in an situation like issues or PRs, where referencing
to other issues is quite common and only referencing to their issue
indexing is an handy and efficient way to do it.
- Currently this is also run for documents (which is the user profile
and viewing rendered files), but in those situations it's less common to
reference issues by their index and instead could mean something else.
- This patch disables this post processing for issue index for
documents. Which matches Github's behavior.
- Added unit tests.
- Resolves https://codeberg.org/Codeberg/Community/issues/1120

modules/markup/html.go

@@ -852,7 +852,7 @@ func fullIssuePatternProcessor(ctx *RenderContext, node *html.Node) {
 }
 
 func issueIndexPatternProcessor(ctx *RenderContext, node *html.Node) {
-	if ctx.Metas == nil {
+	if ctx.Metas == nil || ctx.Metas["mode"] == "document" {
 		return
 	}
 	var (

modules/markup/html_internal_test.go

@@ -262,6 +262,30 @@ func TestRender_IssueIndexPattern5(t *testing.T) {
 	})
 }
 
+func TestRender_IssueIndexPattern_Document(t *testing.T) {
+	setting.AppURL = TestAppURL
+	metas := map[string]string{
+		"format": "https://someurl.com/{user}/{repo}/{index}",
+		"user":   "someUser",
+		"repo":   "someRepo",
+		"style":  IssueNameStyleNumeric,
+		"mode":   "document",
+	}
+
+	testRenderIssueIndexPattern(t, "#1", "#1", &RenderContext{
+		Ctx:   git.DefaultContext,
+		Metas: metas,
+	})
+	testRenderIssueIndexPattern(t, "#1312", "#1312", &RenderContext{
+		Ctx:   git.DefaultContext,
+		Metas: metas,
+	})
+	testRenderIssueIndexPattern(t, "!1", "!1", &RenderContext{
+		Ctx:   git.DefaultContext,
+		Metas: metas,
+	})
+}
+
 func testRenderIssueIndexPattern(t *testing.T, input, expected string, ctx *RenderContext) {
 	if ctx.URLPrefix == "" {
 		ctx.URLPrefix = TestAppURL

modules/markup/html_test.go

@@ -529,6 +529,42 @@ func Test_ParseClusterFuzz(t *testing.T) {
 	assert.NotContains(t, res.String(), "<html")
 }
 
+func TestPostProcess_RenderDocument(t *testing.T) {
+	setting.AppURL = TestAppURL
+
+	localMetas := map[string]string{
+		"user": "go-gitea",
+		"repo": "gitea",
+		"mode": "document",
+	}
+
+	test := func(input, expected string) {
+		var res strings.Builder
+		err := PostProcess(&RenderContext{
+			Ctx:       git.DefaultContext,
+			URLPrefix: "https://example.com",
+			Metas:     localMetas,
+		}, strings.NewReader(input), &res)
+		assert.NoError(t, err)
+		assert.Equal(t, strings.TrimSpace(expected), strings.TrimSpace(res.String()))
+	}
+
+	// Issue index shouldn't be post processing in an document.
+	test(
+		"#1",
+		"#1")
+
+	// Test that other post processing still works.
+	test(
+		":gitea:",
+		`<span class="emoji" aria-label="gitea"><img alt=":gitea:" src="`+setting.StaticURLPrefix+`/assets/img/emoji/gitea.png"/></span>`)
+	test(
+		"Some text with 😄 in the middle",
+		`Some text with <span class="emoji" aria-label="grinning face with smiling eyes">😄</span> in the middle`)
+	test("http://localhost:3000/person/repo/issues/4#issuecomment-1234",
+		`<a href="http://localhost:3000/person/repo/issues/4#issuecomment-1234" class="ref-issue">person/repo#4 (comment)</a>`)
+}
+
 func TestIssue16020(t *testing.T) {
 	setting.AppURL = TestAppURL