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;
11 Object.keys(opts.alias || {}).forEach(function (key) {
12 aliases[key] = [].concat(opts.alias[key]);
13 aliases[key].forEach(function (x) {
14 aliases[x] = [key].concat(aliases[key].filter(function (y) {
20 [].concat(opts.string).filter(Boolean).forEach(function (key) {
21 flags.strings[key] = true;
23 flags.strings[aliases[key]] = true;
27 var defaults = opts['default'] || {};
29 var argv = { _ : [] };
30 Object.keys(flags.bools).forEach(function (key) {
31 setArg(key, defaults[key] === undefined ? false : defaults[key]);
36 if (args.indexOf('--') !== -1) {
37 notFlags = args.slice(args.indexOf('--')+1);
38 args = args.slice(0, args.indexOf('--'));
41 function setArg (key, val) {
42 var value = !flags.strings[key] && isNumber(val)
45 setKey(argv, key.split('.'), value);
47 (aliases[key] || []).forEach(function (x) {
48 setKey(argv, x.split('.'), value);
52 for (var i = 0; i < args.length; i++) {
55 if (/^--.+=/.test(arg)) {
56 // Using [\s\S] instead of . because js doesn't support the
57 // 'dotall' regex modifier. See:
58 // http://stackoverflow.com/a/1068308/13216
59 var m = arg.match(/^--([^=]+)=([\s\S]*)$/);
62 else if (/^--no-.+/.test(arg)) {
63 var key = arg.match(/^--no-(.+)/)[1];
66 else if (/^--.+/.test(arg)) {
67 var key = arg.match(/^--(.+)/)[1];
68 var next = args[i + 1];
69 if (next !== undefined && !/^-/.test(next)
71 && (aliases[key] ? !flags.bools[aliases[key]] : true)) {
75 else if (/^(true|false)$/.test(next)) {
76 setArg(key, next === 'true');
80 setArg(key, flags.strings[key] ? '' : true);
83 else if (/^-[^-]+/.test(arg)) {
84 var letters = arg.slice(1,-1).split('');
87 for (var j = 0; j < letters.length; j++) {
88 var next = arg.slice(j+2);
91 setArg(letters[j], next)
95 if (/[A-Za-z]/.test(letters[j])
96 && /-?\d+(\.\d*)?(e-?\d+)?$/.test(next)) {
97 setArg(letters[j], next);
102 if (letters[j+1] && letters[j+1].match(/\W/)) {
103 setArg(letters[j], arg.slice(j+2));
108 setArg(letters[j], flags.strings[letters[j]] ? '' : true);
112 var key = arg.slice(-1)[0];
113 if (!broken && key !== '-') {
114 if (args[i+1] && !/^(-|--)[^-]/.test(args[i+1])
116 && (aliases[key] ? !flags.bools[aliases[key]] : true)) {
117 setArg(key, args[i+1]);
120 else if (args[i+1] && /true|false/.test(args[i+1])) {
121 setArg(key, args[i+1] === 'true');
125 setArg(key, flags.strings[key] ? '' : true);
131 flags.strings['_'] || !isNumber(arg) ? arg : Number(arg)
136 Object.keys(defaults).forEach(function (key) {
137 if (!hasKey(argv, key.split('.'))) {
138 setKey(argv, key.split('.'), defaults[key]);
140 (aliases[key] || []).forEach(function (x) {
141 setKey(argv, x.split('.'), defaults[key]);
146 notFlags.forEach(function(key) {
153 function hasKey (obj, keys) {
155 keys.slice(0,-1).forEach(function (key) {
159 var key = keys[keys.length - 1];
163 function setKey (obj, keys, value) {
165 keys.slice(0,-1).forEach(function (key) {
166 if (o[key] === undefined) o[key] = {};
170 var key = keys[keys.length - 1];
171 if (o[key] === undefined || typeof o[key] === 'boolean') {
174 else if (Array.isArray(o[key])) {
178 o[key] = [ o[key], value ];
182 function isNumber (x) {
183 if (typeof x === 'number') return true;
184 if (/^0x[0-9a-f]+$/i.test(x)) return true;
185 return /^[-+]?(?:\d+(?:\.\d*)?|\.\d+)(e[-+]?\d+)?$/.test(x);