1 module.exports = function (args, opts) {
4 var flags = { bools : {}, strings : {} };
6 [].concat(opts['boolean']).filter(Boolean).forEach(function (key) {
7 flags.bools[key] = true;
10 [].concat(opts.string).filter(Boolean).forEach(function (key) {
11 flags.strings[key] = true;
15 Object.keys(opts.alias || {}).forEach(function (key) {
16 aliases[key] = [].concat(opts.alias[key]);
17 aliases[key].forEach(function (x) {
18 aliases[x] = [key].concat(aliases[key].filter(function (y) {
24 var defaults = opts['default'] || {};
26 var argv = { _ : [] };
27 Object.keys(flags.bools).forEach(function (key) {
28 setArg(key, defaults[key] === undefined ? false : defaults[key]);
33 if (args.indexOf('--') !== -1) {
34 notFlags = args.slice(args.indexOf('--')+1);
35 args = args.slice(0, args.indexOf('--'));
38 function setArg (key, val) {
39 var value = !flags.strings[key] && isNumber(val)
42 setKey(argv, key.split('.'), value);
44 (aliases[key] || []).forEach(function (x) {
45 setKey(argv, x.split('.'), value);
49 for (var i = 0; i < args.length; i++) {
52 if (/^--.+=/.test(arg)) {
53 // Using [\s\S] instead of . because js doesn't support the
54 // 'dotall' regex modifier. See:
55 // http://stackoverflow.com/a/1068308/13216
56 var m = arg.match(/^--([^=]+)=([\s\S]*)$/);
59 else if (/^--no-.+/.test(arg)) {
60 var key = arg.match(/^--no-(.+)/)[1];
63 else if (/^--.+/.test(arg)) {
64 var key = arg.match(/^--(.+)/)[1];
65 var next = args[i + 1];
66 if (next !== undefined && !/^-/.test(next)
68 && (aliases[key] ? !flags.bools[aliases[key]] : true)) {
72 else if (/^(true|false)$/.test(next)) {
73 setArg(key, next === 'true');
77 setArg(key, flags.strings[key] ? '' : true);
80 else if (/^-[^-]+/.test(arg)) {
81 var letters = arg.slice(1,-1).split('');
84 for (var j = 0; j < letters.length; j++) {
85 var next = arg.slice(j+2);
88 setArg(letters[j], next)
92 if (/[A-Za-z]/.test(letters[j])
93 && /-?\d+(\.\d*)?(e-?\d+)?$/.test(next)) {
94 setArg(letters[j], next);
99 if (letters[j+1] && letters[j+1].match(/\W/)) {
100 setArg(letters[j], arg.slice(j+2));
105 setArg(letters[j], flags.strings[letters[j]] ? '' : true);
109 var key = arg.slice(-1)[0];
110 if (!broken && key !== '-') {
111 if (args[i+1] && !/^(-|--)[^-]/.test(args[i+1])
113 && (aliases[key] ? !flags.bools[aliases[key]] : true)) {
114 setArg(key, args[i+1]);
117 else if (args[i+1] && /true|false/.test(args[i+1])) {
118 setArg(key, args[i+1] === 'true');
122 setArg(key, flags.strings[key] ? '' : true);
128 flags.strings['_'] || !isNumber(arg) ? arg : Number(arg)
133 Object.keys(defaults).forEach(function (key) {
134 if (!hasKey(argv, key.split('.'))) {
135 setKey(argv, key.split('.'), defaults[key]);
137 (aliases[key] || []).forEach(function (x) {
138 setKey(argv, x.split('.'), defaults[key]);
143 notFlags.forEach(function(key) {
150 function hasKey (obj, keys) {
152 keys.slice(0,-1).forEach(function (key) {
156 var key = keys[keys.length - 1];
160 function setKey (obj, keys, value) {
162 keys.slice(0,-1).forEach(function (key) {
163 if (o[key] === undefined) o[key] = {};
167 var key = keys[keys.length - 1];
168 if (o[key] === undefined || typeof o[key] === 'boolean') {
171 else if (Array.isArray(o[key])) {
175 o[key] = [ o[key], value ];
179 function isNumber (x) {
180 if (typeof x === 'number') return true;
181 if (/^0x[0-9a-f]+$/i.test(x)) return true;
182 return /^[-+]?(?:\d+(?:\.\d*)?|\.\d+)(e[-+]?\d+)?$/.test(x);
185 function longest (xs) {
186 return Math.max.apply(null, xs.map(function (x) { return x.length }));