directoryWalker: (dir, callback, maxLevels, currentLevel, fromRoot) ->
  maxLevels:    if 'number' is typeof maxLevels then maxLevels else 0
  currentLevel: if 'number' is typeof currentLevel then currentLevel else 1
  fromRoot:     if 'string' is typeof fromRoot then fromRoot else ''

  fs.readdir dir, (error, files) ->
    if error then puts error.message
    else files.forEach (file) ->
      fs.stat path.join(dir, file), (error, stats) ->
        return puts error.message if error

        if stats.isDirectory()
          if 0 is maxLevels or maxLevels > currentLevel
            directoryWalker path.join(dir, file), callback,
                            maxLevels, 1 + currentLevel,
                            fromRoot + file + '/'
        callback.call stats, file, fromRoot, path.join(dir, file), stats