detect-port
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detect-port
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			#!/usr/bin/env node

			'use strict';

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

			const args = process.argv.slice(2);
			const arg_0 = args[0];

			if (!!~['-v', '--version'].indexOf(arg_0)) {
			console.log(pkg.version);
			process.exit(0);
			}

			const port = parseInt(arg_0, 10);

			const main = require('..');

			if (!arg_0) {
			const random = Math.floor(9000 + Math.random() * (65535 - 9000));

			main(random, (err, port) => {
			if (err) {
			console.log(`get available port failed with ${err}`);
			}
			console.log(`get available port ${port} randomly`);
			});
			} else if (isNaN(port)) {
			console.log();
			console.log(` \u001b[37m${pkg.description}\u001b[0m`);
			console.log();
			console.log(' Usage:');
			console.log();
			console.log(` ${pkg.name} [port]`);
			console.log();
			console.log(' Options:');
			console.log();
			console.log(' -v, --version show version and exit');
			console.log(' -h, --help output usage information');
			console.log();
			console.log(' Further help:');
			console.log();
			console.log(` ${pkg.homepage}`);
			console.log();
			} else {
			main(port, (err, _port) => {
			if (err) {
			console.log(`get available port failed with ${err}`);
			}

			if (port !== _port) {
			console.log(`port ${port} was occupied`);
			}
			console.log(`get available port ${_port}`);
			});
			}