forked from M3-Academy/challenge-algorithms-v2.0
54 lines
1.4 KiB
JavaScript
54 lines
1.4 KiB
JavaScript
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'use strict';
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// classic singleton yargs API, to use yargs
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// without running as a singleton do:
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// require('yargs/yargs')(process.argv.slice(2))
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const {Yargs, processArgv} = require('./build/index.cjs');
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Argv(processArgv.hideBin(process.argv));
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module.exports = Argv;
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function Argv(processArgs, cwd) {
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const argv = Yargs(processArgs, cwd, require);
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singletonify(argv);
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// TODO(bcoe): warn if argv.parse() or argv.argv is used directly.
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return argv;
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}
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function defineGetter(obj, key, getter) {
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Object.defineProperty(obj, key, {
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configurable: true,
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enumerable: true,
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get: getter,
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});
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}
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function lookupGetter(obj, key) {
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const desc = Object.getOwnPropertyDescriptor(obj, key);
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if (typeof desc !== 'undefined') {
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return desc.get;
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}
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}
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/* Hack an instance of Argv with process.argv into Argv
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so people can do
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require('yargs')(['--beeble=1','-z','zizzle']).argv
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to parse a list of args and
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require('yargs').argv
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to get a parsed version of process.argv.
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*/
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function singletonify(inst) {
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[
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...Object.keys(inst),
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...Object.getOwnPropertyNames(inst.constructor.prototype),
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].forEach(key => {
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if (key === 'argv') {
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defineGetter(Argv, key, lookupGetter(inst, key));
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} else if (typeof inst[key] === 'function') {
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Argv[key] = inst[key].bind(inst);
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} else {
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defineGetter(Argv, '$0', () => inst.$0);
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defineGetter(Argv, 'parsed', () => inst.parsed);
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}
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});
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}
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