function config(fm, argv) {
  inquirer.prompt(menu.main, result => {
    const exports = module.exports

    if (!exports[result.type]) 
      return exports.help()

    exports[result.type](fm, argv)
  })
}
[Show configs UI]
@param  {Object} fm   [a douban.fm instance]
@param  {Array}  argv [command line arguments]