docs: function menu( items, nextStep ) {
      const rl = RL.createInterface( {
          input: process.stdin,
          output: process.stdout
      } );
      console.log();
      items.forEach( function ( item, idx ) {
          var out = idx < 10 ? ' ' : '';
          out += ( "" + ( 1 + idx ) + ") " ).yellow;
          out += item;
          console.log( out );
      } );
      console.log();
      rl.question( "Your choice: ", ( ans ) => {
          rl.close();
          var choice = parseInt( ans );
          if ( isNaN( ans ) || ans < 1 || ans > items.length ) {
              menu( items, nextStep );
          } else {
              console.log();
              nextStep( choice );
          }
      } );
  }