一、commander

#!/usr/bin/env node

const program = require('commander');

const colors  = require('colors');

const pkg = require('./package.json');

function range(val, d) {

    return val.split('..').map(Number);

  }

  function list(val) {

    return val.split(',');

  }

  function collect(val, memo) {

    memo.push(val);

    return memo;

  }

  function increaseVerbosity(v, total) {

    return total + 1;

  }

program

    .version(pkg.version, '-v, --version')

    .option('-u, --username <firstname>', 'add username')

    .option('-p, --password [num]', 'add password')

    .option('--no-sauce', 'Remove sauce')

    // .option('-i, --integer <n>', 'An integer argument', parseInt)

    .option('-f, --float <n>', 'A float argument', parseFloat)

    .option('-r, --range [a..b]', 'A range', range, 12)

    .option('-l, --list <items>', 'A list', list)

    .option('-o, --optional [value]', 'An optional value')

    .option('-c, --collect [value]', 'A repeatable value', collect, [])

    .option('-v, --verbose', 'A value that can be increased', increaseVerbosity, 0)

program

    .command('create <project> [rest...]')

    .alias('init')

    .description('ssy cli description')

    .option('-i, --information [info]', 'add information')

    .action((projectName, cmd, options)=>{

        console.log("ssy",projectName, cmd, options.information)

    })

if (!process.argv.slice(2).length) {

    program.outputHelp(make_red);

}

function make_red(txt) {

    return colors.red(txt); //display the help text in red on the console

}

// must be before .parse() since

// node's emit() is immediate

program.on('--help', function(){

    console.log('')

    console.log('Examples:');

    console.log('  $ ssy --help');

    console.log('  $ ssy -h');

});

program.parse(process.argv);

// console.log(program);