File file = newDir("some-dir");

    assertThat(Files.fileTraverser().breadthFirst(rootDir)).containsExactly(rootDir, file);
  }

  public void testFileTraverser_multipleFilesAndDirectories() throws Exception {
    File fileA = newFile("file-a");
    File fileB = newFile("file-b");
    File dir1 = newDir("dir-1");
    File dir2 = newDir("dir-2");

    Path file = newDir("some-dir");

    assertThat(MoreFiles.fileTraverser().breadthFirst(rootDir)).containsExactly(rootDir, file);
  }

  public void testFileTraverser_multipleFilesAndDirectories() throws Exception {
    Path fileA = newFile("file-a");
    Path fileB = newFile("file-b");
    Path dir1 = newDir("dir-1");
    Path dir2 = newDir("dir-2");

    }

    private Resource alignToBaseDirectory(Resource resource, Path basedir) {
        if (resource != null) {
            String newDir = mayAlignToBaseDirectoryOrNull(resource.getDirectory(), basedir);
            if (newDir != null) {
                return resource.withDirectory(newDir);
            }
        }
        return resource;
    }

    private String alignToBaseDirectory(String path, Path basedir) {

	f, err := newFile(path)
	if err != nil {
		return fmt.Errorf("unable to create new file at %v: %w", path, err)
	}

	w.f = f

	return nil
}

// NewDir creates a new concurrency safe Writer which performs log rotation.
func NewDir(opts Options) (io.WriteCloser, error) {
	if err := os.MkdirAll(opts.Directory, os.ModePerm); err != nil {

	if ctx.IsSet("log-prefix") {
		fileNameFunc = func() string {
			return fmt.Sprintf("%s-%s.log", ctx.String("log-prefix"), fmt.Sprintf("%X", time.Now().UTC().UnixNano()))
		}
	}

	output, err := logger.NewDir(logger.Options{
		Directory:       lgDirAbs,
		MaximumFileSize: int64(lgSize),
		Compress:        ctx.Bool("log-compress"),
		FileNameFunc:    fileNameFunc,
	})
	if err != nil {
		return nil, err
	}