fix: rendering internal file links in org (go-gitea#29669)

The internal links to other files in the repository were not rendering
with the Src Prefix (/src/branch-name/file-path). This commit fixes that
by using the `SrcLink` as base if available.

Resolves go-gitea#29668

Author: ankitrgadiya

modules/markup/orgmode/orgmode.go

@@ -143,10 +143,18 @@ func (r *Writer) resolveLink(kind, link string) string {
 			// so we need to try to guess the link kind again here
 			kind = org.RegularLink{URL: link}.Kind()
 		}
+
 		base := r.Ctx.Links.Base
+		if r.Ctx.IsWiki {
+			base = r.Ctx.Links.WikiLink()
+		} else if r.Ctx.Links.HasBranchInfo() {
+			base = r.Ctx.Links.SrcLink()
+		}
+
 		if kind == "image" || kind == "video" {
 			base = r.Ctx.Links.ResolveMediaLink(r.Ctx.IsWiki)
 		}
+
 		link = util.URLJoin(base, link)
 	}
 	return link

modules/markup/orgmode/orgmode_test.go

@@ -19,24 +19,50 @@ const AppURL = "http://localhost:3000/"
 func TestRender_StandardLinks(t *testing.T) {
 	setting.AppURL = AppURL
 
-	test := func(input, expected string) {
+	test := func(input, expected string, isWiki bool) {
 		buffer, err := RenderString(&markup.RenderContext{
 			Ctx: git.DefaultContext,
 			Links: markup.Links{
 				Base:       "/relative-path",
 				BranchPath: "branch/main",
 			},
+			IsWiki: isWiki,
 		}, input)
 		assert.NoError(t, err)
 		assert.Equal(t, strings.TrimSpace(expected), strings.TrimSpace(buffer))
 	}
 
 	test("[[https://google.com/]]",
-		`<p><a href="https://google.com/">https://google.com/</a></p>`)
+		`<p><a href="https://google.com/">https://google.com/</a></p>`, false)
 	test("[[WikiPage][The WikiPage Desc]]",
-		`<p><a href="/relative-path/WikiPage">The WikiPage Desc</a></p>`)
+		`<p><a href="/relative-path/wiki/WikiPage">The WikiPage Desc</a></p>`, true)
 	test("[[ImageLink.svg][The Image Desc]]",
-		`<p><a href="/relative-path/media/branch/main/ImageLink.svg">The Image Desc</a></p>`)
+		`<p><a href="/relative-path/media/branch/main/ImageLink.svg">The Image Desc</a></p>`, false)
+}
+
+func TestRender_InternalLinks(t *testing.T) {
+	setting.AppURL = AppURL
+
+	test := func(input, expected string) {
+		buffer, err := RenderString(&markup.RenderContext{
+			Ctx: git.DefaultContext,
+			Links: markup.Links{
+				Base:       "/relative-path",
+				BranchPath: "branch/main",
+			},
+		}, input)
+		assert.NoError(t, err)
+		assert.Equal(t, strings.TrimSpace(expected), strings.TrimSpace(buffer))
+	}
+
+	test("[[file:test.org][Test]]",
+		`<p><a href="/relative-path/src/branch/main/test.org">Test</a></p>`)
+	test("[[./test.org][Test]]",
+		`<p><a href="/relative-path/src/branch/main/test.org">Test</a></p>`)
+	test("[[test.org][Test]]",
+		`<p><a href="/relative-path/src/branch/main/test.org">Test</a></p>`)
+	test("[[path/to/test.org][Test]]",
+		`<p><a href="/relative-path/src/branch/main/path/to/test.org">Test</a></p>`)
 }
 
 func TestRender_Media(t *testing.T) {