--- /dev/null
+'use strict';
+const path = require('path');
+const buildMinimistOptions = require('minimist-options');
+const minimist = require('minimist');
+const camelcaseKeys = require('camelcase-keys');
+const decamelizeKeys = require('decamelize-keys');
+const trimNewlines = require('trim-newlines');
+const redent = require('redent');
+const readPkgUp = require('read-pkg-up');
+const loudRejection = require('loud-rejection');
+const normalizePackageData = require('normalize-package-data');
+
+// Prevent caching of this module so module.parent is always accurate
+delete require.cache[__filename];
+const parentDir = path.dirname(module.parent.filename);
+
+module.exports = (helpMessage, opts) => {
+ loudRejection();
+
+ if (typeof helpMessage === 'object' && !Array.isArray(helpMessage)) {
+ opts = helpMessage;
+ helpMessage = '';
+ }
+
+ opts = Object.assign({
+ pkg: readPkgUp.sync({
+ cwd: parentDir,
+ normalize: false
+ }).pkg || {},
+ argv: process.argv.slice(2),
+ inferType: false,
+ input: 'string',
+ help: helpMessage,
+ autoHelp: true,
+ autoVersion: true
+ }, opts);
+
+ let minimistOpts = Object.assign({
+ arguments: opts.input
+ }, opts.flags);
+
+ minimistOpts = decamelizeKeys(minimistOpts, '-', {exclude: ['stopEarly', '--']});
+
+ if (opts.inferType) {
+ delete minimistOpts.arguments;
+ }
+
+ minimistOpts = buildMinimistOptions(minimistOpts);
+
+ const pkg = opts.pkg;
+ const argv = minimist(opts.argv, minimistOpts);
+ let help = redent(trimNewlines((opts.help || '').replace(/\t+\n*$/, '')), 2);
+
+ normalizePackageData(pkg);
+
+ process.title = pkg.bin ? Object.keys(pkg.bin)[0] : pkg.name;
+
+ let description = opts.description;
+ if (!description && description !== false) {
+ description = pkg.description;
+ }
+
+ help = (description ? `\n ${description}\n` : '') + (help ? `\n${help}\n` : '\n');
+
+ const showHelp = code => {
+ console.log(help);
+ process.exit(typeof code === 'number' ? code : 2);
+ };
+
+ const showVersion = () => {
+ console.log(typeof opts.version === 'string' ? opts.version : pkg.version);
+ process.exit();
+ };
+
+ if (argv.version && opts.autoVersion) {
+ showVersion();
+ }
+
+ if (argv.help && opts.autoHelp) {
+ showHelp(0);
+ }
+
+ const input = argv._;
+ delete argv._;
+
+ const flags = camelcaseKeys(argv, {exclude: ['--', /^\w$/]});
+
+ return {
+ input,
+ flags,
+ pkg,
+ help,
+ showHelp,
+ showVersion
+ };
+};