1 module.exports = function (args, opts) {
4 var flags = { bools : {}, strings : {}, unknownFn: null };
6 if (typeof opts['unknown'] === 'function') {
7 flags.unknownFn = opts['unknown'];
10 if (typeof opts['boolean'] === 'boolean' && opts['boolean']) {
11 flags.allBools = true;
13 [].concat(opts['boolean']).filter(Boolean).forEach(function (key) {
14 flags.bools[key] = true;
19 Object.keys(opts.alias || {}).forEach(function (key) {
20 aliases[key] = [].concat(opts.alias[key]);
21 aliases[key].forEach(function (x) {
22 aliases[x] = [key].concat(aliases[key].filter(function (y) {
28 [].concat(opts.string).filter(Boolean).forEach(function (key) {
29 flags.strings[key] = true;
31 flags.strings[aliases[key]] = true;
35 var defaults = opts['default'] || {};
37 var argv = { _ : [] };
38 Object.keys(flags.bools).forEach(function (key) {
39 setArg(key, defaults[key] === undefined ? false : defaults[key]);
44 if (args.indexOf('--') !== -1) {
45 notFlags = args.slice(args.indexOf('--')+1);
46 args = args.slice(0, args.indexOf('--'));
49 function argDefined(key, arg) {
50 return (flags.allBools && /^--[^=]+$/.test(arg)) ||
51 flags.strings[key] || flags.bools[key] || aliases[key];
54 function setArg (key, val, arg) {
55 if (arg && flags.unknownFn && !argDefined(key, arg)) {
56 if (flags.unknownFn(arg) === false) return;
59 var value = !flags.strings[key] && isNumber(val)
62 setKey(argv, key.split('.'), value);
64 (aliases[key] || []).forEach(function (x) {
65 setKey(argv, x.split('.'), value);
69 function setKey (obj, keys, value) {
71 keys.slice(0,-1).forEach(function (key) {
72 if (o[key] === undefined) o[key] = {};
76 var key = keys[keys.length - 1];
77 if (o[key] === undefined || flags.bools[key] || typeof o[key] === 'boolean') {
80 else if (Array.isArray(o[key])) {
84 o[key] = [ o[key], value ];
88 function aliasIsBoolean(key) {
89 return aliases[key].some(function (x) {
90 return flags.bools[x];
94 for (var i = 0; i < args.length; i++) {
97 if (/^--.+=/.test(arg)) {
98 // Using [\s\S] instead of . because js doesn't support the
99 // 'dotall' regex modifier. See:
100 // http://stackoverflow.com/a/1068308/13216
101 var m = arg.match(/^--([^=]+)=([\s\S]*)$/);
104 if (flags.bools[key]) {
105 value = value !== 'false';
107 setArg(key, value, arg);
109 else if (/^--no-.+/.test(arg)) {
110 var key = arg.match(/^--no-(.+)/)[1];
111 setArg(key, false, arg);
113 else if (/^--.+/.test(arg)) {
114 var key = arg.match(/^--(.+)/)[1];
115 var next = args[i + 1];
116 if (next !== undefined && !/^-/.test(next)
119 && (aliases[key] ? !aliasIsBoolean(key) : true)) {
120 setArg(key, next, arg);
123 else if (/^(true|false)$/.test(next)) {
124 setArg(key, next === 'true', arg);
128 setArg(key, flags.strings[key] ? '' : true, arg);
131 else if (/^-[^-]+/.test(arg)) {
132 var letters = arg.slice(1,-1).split('');
135 for (var j = 0; j < letters.length; j++) {
136 var next = arg.slice(j+2);
139 setArg(letters[j], next, arg)
143 if (/[A-Za-z]/.test(letters[j]) && /=/.test(next)) {
144 setArg(letters[j], next.split('=')[1], arg);
149 if (/[A-Za-z]/.test(letters[j])
150 && /-?\d+(\.\d*)?(e-?\d+)?$/.test(next)) {
151 setArg(letters[j], next, arg);
156 if (letters[j+1] && letters[j+1].match(/\W/)) {
157 setArg(letters[j], arg.slice(j+2), arg);
162 setArg(letters[j], flags.strings[letters[j]] ? '' : true, arg);
166 var key = arg.slice(-1)[0];
167 if (!broken && key !== '-') {
168 if (args[i+1] && !/^(-|--)[^-]/.test(args[i+1])
170 && (aliases[key] ? !aliasIsBoolean(key) : true)) {
171 setArg(key, args[i+1], arg);
174 else if (args[i+1] && /true|false/.test(args[i+1])) {
175 setArg(key, args[i+1] === 'true', arg);
179 setArg(key, flags.strings[key] ? '' : true, arg);
184 if (!flags.unknownFn || flags.unknownFn(arg) !== false) {
186 flags.strings['_'] || !isNumber(arg) ? arg : Number(arg)
189 if (opts.stopEarly) {
190 argv._.push.apply(argv._, args.slice(i + 1));
196 Object.keys(defaults).forEach(function (key) {
197 if (!hasKey(argv, key.split('.'))) {
198 setKey(argv, key.split('.'), defaults[key]);
200 (aliases[key] || []).forEach(function (x) {
201 setKey(argv, x.split('.'), defaults[key]);
207 argv['--'] = new Array();
208 notFlags.forEach(function(key) {
209 argv['--'].push(key);
213 notFlags.forEach(function(key) {
221 function hasKey (obj, keys) {
223 keys.slice(0,-1).forEach(function (key) {
227 var key = keys[keys.length - 1];
231 function isNumber (x) {
232 if (typeof x === 'number') return true;
233 if (/^0x[0-9a-f]+$/i.test(x)) return true;
234 return /^[-+]?(?:\d+(?:\.\d*)?|\.\d+)(e[-+]?\d+)?$/.test(x);