appview/reporesolver: fix current directory extraction for tree paths

path.Dir on extractPathAfterRef returned the parent directory, which broke relative link resolution in markdown when viewing directories. extractCurrentDir now handles blob and tree paths separately: blob paths return the parent dir, tree paths return the directory itself

Signed-off-by: moshyfawn <[e-mail]>

appview/reporesolver/resolver.go

···
 	}
 
 	// get dir/ref
-	currentDir := path.Dir(extractPathAfterRef(r.URL.EscapedPath()))
+	currentDir := extractCurrentDir(r.URL.EscapedPath())
 	ref := chi.URLParam(r, "ref")
 
 	repoAt := repo.RepoAt()
···
 	}
 
 	return repoInfo
+}
+
+// extractCurrentDir gets the current directory for markdown link resolution.
+// for blob paths, returns the parent dir. for tree paths, returns the path itself.
+//
+//	/@user/repo/blob/main/docs/README.md => docs
+//	/@user/repo/tree/main/docs           => docs
+func extractCurrentDir(fullPath string) string {
+	fullPath = strings.TrimPrefix(fullPath, "/")
+
+	blobPattern := regexp.MustCompile(`blob/[^/]+/(.*)$`)
+	if matches := blobPattern.FindStringSubmatch(fullPath); len(matches) > 1 {
+		return path.Dir(matches[1])
+	}
+
+	treePattern := regexp.MustCompile(`tree/[^/]+/(.*)$`)
+	if matches := treePattern.FindStringSubmatch(fullPath); len(matches) > 1 {
+		dir := strings.TrimSuffix(matches[1], "/")
+		if dir == "" {
+			return "."
+		}
+		return dir
+	}
+
+	return "."
 }
 
 // extractPathAfterRef gets the actual repository path

appview/reporesolver/resolver_test.go

···
+package reporesolver
+
+import "testing"
+
+func TestExtractCurrentDir(t *testing.T) {
+	tests := []struct {
+		path string
+		want string
+	}{
+		{"/@user/repo/blob/main/docs/README.md", "docs"},
+		{"/@user/repo/blob/main/README.md", "."},
+		{"/@user/repo/tree/main/docs", "docs"},
+		{"/@user/repo/tree/main/docs/", "docs"},
+		{"/@user/repo/tree/main", "."},
+	}
+
+	for _, tt := range tests {
+		if got := extractCurrentDir(tt.path); got != tt.want {
+			t.Errorf("extractCurrentDir(%q) = %q, want %q", tt.path, got, tt.want)
+		}
+	}
+}