Function rmFileAndDirsIfEmpty

worktree.go:1026–1049

will walk up the directory tree removing all encountered empty directories, not just the one containing this file

(fs billy.Filesystem, name string)

// will walk up the directory tree removing all encountered empty
// directories, not just the one containing this file
func rmFileAndDirsIfEmpty(fs billy.Filesystem, name string) error {
	if err := util.RemoveAll(fs, name); err != nil {
		return err
	}

	dir := filepath.Dir(name)
	for {
		removed, err := removeDirIfEmpty(fs, dir)
		if err != nil && !os.IsNotExist(err) {
			return err
		}

		if !removed {
			// directory was not empty and not removed,
			// stop checking parents
			break
		}

		// move to parent directory
		dir = filepath.Dir(dir)
	}

	return nil
}

// removeDirIfEmpty will remove the supplied directory `dir` if
// `dir` is empty