simctl/program.js at master · lsongdev/simctl · GitHub

39 lines (36 loc) · 936 Bytes

const parse = argv =>

argv.reduce((args, value) => {

if (value.startsWith('--')) {

const m = value.match(/^--(\w+)(=(.+))?$/);

const k = m[1];

const v = m[3] ? m[3] : true;

args[k] = v;

} else {

args._.push(value);

}

return args;

}, { _: [] });

const program = options => {

const interface = {

command(name, fn) {

this.commands = this.commands || {};

this.commands[name] = fn;

return this;

exec(name = 'help') {

const fn = this.commands[name];

if (typeof fn !== 'function') {

throw new TypeError(`command "${name}" not found`);

}

return fn.apply(this, [].slice.call(arguments, 1));

parse(argv = process.argv.slice(2)) {

const args = parse(argv);

const name = args._.shift();

return this.exec(name, args);

}

};

return interface;

};

program.parse = parse;

module.exports = program;

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