Omit current directory when browse --branch is used with no file argument (#4676)

pkg/cmd/browse/browse.go

@@ -192,6 +192,10 @@ func parseSection(baseRepo ghrepo.Interface, opts *BrowseOptions) (string, error
 }
 
 func parseFile(opts BrowseOptions, f string) (p string, start int, end int, err error) {
+	if f == "" {
+		return
+	}
+
 	parts := strings.SplitN(f, ":", 3)
 	if len(parts) > 2 {
 		err = fmt.Errorf("invalid file argument: %q", f)

pkg/cmd/browse/browse_test.go

@@ -228,6 +228,35 @@ func Test_runBrowse(t *testing.T) {
 			baseRepo:    ghrepo.New("bchadwic", "LedZeppelinIV"),
 			expectedURL: "https://github.com/bchadwic/LedZeppelinIV/tree/trunk/main.go",
 		},
+		{
+			name: "branch flag within dir",
+			opts: BrowseOptions{
+				Branch:           "feature-123",
+				PathFromRepoRoot: func() string { return "pkg/dir" },
+			},
+			baseRepo:    ghrepo.New("bstnc", "yeepers"),
+			expectedURL: "https://github.com/bstnc/yeepers/tree/feature-123/",
+		},
+		{
+			name: "branch flag within dir with .",
+			opts: BrowseOptions{
+				Branch:           "feature-123",
+				SelectorArg:      ".",
+				PathFromRepoRoot: func() string { return "pkg/dir" },
+			},
+			baseRepo:    ghrepo.New("bstnc", "yeepers"),
+			expectedURL: "https://github.com/bstnc/yeepers/tree/feature-123/pkg/dir",
+		},
+		{
+			name: "branch flag within dir with dir",
+			opts: BrowseOptions{
+				Branch:           "feature-123",
+				SelectorArg:      "inner/more",
+				PathFromRepoRoot: func() string { return "pkg/dir" },
+			},
+			baseRepo:    ghrepo.New("bstnc", "yeepers"),
+			expectedURL: "https://github.com/bstnc/yeepers/tree/feature-123/pkg/dir/inner/more",
+		},
 		{
 			name: "file with line number",
 			opts: BrowseOptions{
@@ -466,6 +495,11 @@ func Test_parsePathFromFileArg(t *testing.T) {
 			fileArg:      filepath.Join("..", "..", "..") + s + "",
 			expectedPath: "",
 		},
+		{
+			name:         "empty fileArg",
+			fileArg:      "",
+			expectedPath: "",
+		},
 	}
 	for _, tt := range tests {
 		path, _, _, _ := parseFile(BrowseOptions{