code: function parse(input, done) {
    if (input && input.args) return done(undefined, input);
    if (input) done(undefined, {args: [].concat(input)});
    cmd([], done);
  }
docs: Parses input into options.
  @param {({args: Array.<string>}|Array.<string>|string)=} input
  @param {function(Error, {args: Array.<string>}=)} done