docs: function style(str, options) {
      var ret = str;
      if (options) {
          if (ret instanceof Array) {
              ret = ret.map(function (s) {
                  return style(s, options);
              });
          } else if (options instanceof Array) {
              options.forEach(function (option) {
                  ret = style(ret, option);
              });
          } else if (options in styles) {
              ret = '\x1B[' + styles[options] + 'm' + str + '\x1B[0m';
          }
      }
      return ret;
  }