[GITEA] Fix orgmode link resolver for text descriptions

- Backport of #2276
- It's possible that the description of an `Regularlink` is `Text` and not
another `Regularlink`. Therefor if it's `Text`, convert it to an
`Regularlink` trough the 'old' behavior (pass it trough `org.String` and
trim `file:` prefix).
- Adds unit tests.
- Resolves https://codeberg.org/Codeberg/Community/issues/1430

(cherry picked from commit 385fc6ee6b)

modules/markup/orgmode/orgmode.go

@@ -135,7 +135,12 @@ type Writer struct {
 
 const mailto = "mailto:"
 
-func (r *Writer) resolveLink(l org.RegularLink) string {
+func (r *Writer) resolveLink(node org.Node) string {
+	l, ok := node.(org.RegularLink)
+	if !ok {
+		l = org.RegularLink{URL: strings.TrimPrefix(org.String(node), "file:")}
+	}
+
 	link := html.EscapeString(l.URL)
 	if l.Protocol == "file" {
 		link = link[len("file:"):]
@@ -162,14 +167,14 @@ func (r *Writer) WriteRegularLink(l org.RegularLink) {
 		if l.Description == nil {
 			fmt.Fprintf(r, `<img src="%s" alt="%s" />`, link, link)
 		} else {
-			imageSrc := r.resolveLink(l.Description[0].(org.RegularLink))
+			imageSrc := r.resolveLink(l.Description[0])
 			fmt.Fprintf(r, `<a href="%s"><img src="%s" alt="%s" /></a>`, link, imageSrc, imageSrc)
 		}
 	case "video":
 		if l.Description == nil {
 			fmt.Fprintf(r, `<video src="%s">%s</video>`, link, link)
 		} else {
-			videoSrc := r.resolveLink(l.Description[0].(org.RegularLink))
+			videoSrc := r.resolveLink(l.Description[0])
 			fmt.Fprintf(r, `<a href="%s"><video src="%s">%s</video></a>`, link, videoSrc, videoSrc)
 		}
 	default:

modules/markup/orgmode/orgmode_test.go

@@ -76,6 +76,12 @@ func TestRender_Media(t *testing.T) {
 		`<p><img src="https://example.com/example.svg" alt="https://example.com/example.svg" /></p>`)
 	test("[[https://example.com/example.mp4]]",
 		`<p><video src="https://example.com/example.mp4">https://example.com/example.mp4</video></p>`)
+
+	// Text description.
+	test("[[file:./lem-post.png][file:./lem-post.png]]",
+		`<p><a href="http://localhost:3000/gogits/gogs/lem-post.png"><img src="http://localhost:3000/gogits/gogs/lem-post.png" alt="http://localhost:3000/gogits/gogs/lem-post.png" /></a></p>`)
+	test("[[file:./lem-post.mp4][file:./lem-post.mp4]]",
+		`<p><a href="http://localhost:3000/gogits/gogs/lem-post.mp4"><video src="http://localhost:3000/gogits/gogs/lem-post.mp4">http://localhost:3000/gogits/gogs/lem-post.mp4</video></a></p>`)
 }
 
 func TestRender_Source(t *testing.T) {