@forchange/mock/index.js

// start serve, parsing configuration.
const yargs = require('yargs');
const path = require('path');
const run = require('supervisor/lib/supervisor').run

const argv = yargs.usage(`
        Usage: mock [options] -d directory \n
        mock [options] -c ./config.json \n
      `)
      .alias('d', 'directory')
      .alias('c', 'config')
      .alias('w', 'watch')
      .alias('p', 'port')
      .alias('h', 'host')
      .alias('s', 'socket')
      .describe('d', 'directory of data')
      .describe('c', 'config file of mock')
      .describe('w', 
        'when a change to a js file or json file occurs, reload the server. Default is false'
      )
      .describe('p', 'port of mock serve')
      .describe('h', 'host of mock serve')
      .describe('s', 'config of socket')
      .example(`
        mock -w -p 80 -h 127.0.0.1 -d ./model\n
        mock -c ./config.json
      `)
      .epilog('By Newbility')
      .argv

let args = [],
    configPath = argv.c || argv.config,
    config = {},
    port = argv.p || argv.port,
    host = argv.h || argv.host,
    isWatch = argv.w || argv.watch,
    modelDir = argv.d || argv.directory ? path.resolve(argv.d || argv.directory) : null
    server = path.resolve(__dirname, './lib/index.js')

if(configPath) {
  configPath = path.resolve(process.cwd(), configPath);
	config = require(configPath);
  isWatch = config.watch;
	modelDir = config.directory && path.resolve(path.dirname(configPath), config.directory) || '';
	if (isWatch && modelDir) {
		args = args.concat(['-w', modelDir, '-e', 'js,json']);
  }
  args = args.concat(['--', server, '-c', configPath]);
} else {
  isWatch && (args = args.concat(['-w', modelDir, '-e', 'js,json']));
	args = args.concat(['--', server]);
	port && (args = args.concat(['-p', port]));
	host && (args = args.concat(['-h', host]));
	modelDir && (args = args.concat(['-d', modelDir]));
}

run(args)