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index.js
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module.exports = function (args, opts) { if (!opts) opts = {}; var flags = { bools : {}, strings : {} }; [].concat(opts['boolean']).filter(Boolean).forEach(function (key) { flags.bools[key] = true; }); [].concat(opts.string).filter(Boolean).forEach(function (key) { flags.strings[key] = true; }); var aliases = {}; Object.keys(opts.alias || {}).forEach(function (key) { aliases[key] = [].concat(opts.alias[key]); aliases[key].forEach(function (x) { aliases[x] = [key].concat(aliases[key].filter(function (y) { return x !== y; })); }); }); var defaults = opts['default'] || {}; var argv = { _ : [] }; Object.keys(flags.bools).forEach(function (key) { setArg(key, defaults[key] === undefined ? false : defaults[key]); }); var notFlags = []; if (args.indexOf('--') !== -1) { notFlags = args.slice(args.indexOf('--')+1); args = args.slice(0, args.indexOf('--')); } function setArg (key, val) { var value = !flags.strings[key] && isNumber(val) ? Number(val) : val ; setKey(argv, key.split('.'), value); (aliases[key] || []).forEach(function (x) { setKey(argv, x.split('.'), value); }); } for (var i = 0; i < args.length; i++) { var arg = args[i]; if (/^--.+=/.test(arg)) { // Using [\s\S] instead of . because js doesn't support the // 'dotall' regex modifier. See: // http://stackoverflow.com/a/1068308/13216 var m = arg.match(/^--([^=]+)=([\s\S]*)$/); setArg(m[1], m[2]); } else if (/^--no-.+/.test(arg)) { var key = arg.match(/^--no-(.+)/)[1]; setArg(key, false); } else if (/^--.+/.test(arg)) { var key = arg.match(/^--(.+)/)[1]; var next = args[i + 1]; if (next !== undefined && !/^-/.test(next) && !flags.bools[key] && (aliases[key] ? !flags.bools[aliases[key]] : true)) { setArg(key, next); i++; } else if (/^(true|false)$/.test(next)) { setArg(key, next === 'true'); i++; } else { setArg(key, flags.strings[key] ? '' : true); } } else if (/^-[^-]+/.test(arg)) { var letters = arg.slice(1,-1).split(''); var broken = false; for (var j = 0; j < letters.length; j++) { var next = arg.slice(j+2); if (next === '-') { setArg(letters[j], next) continue; } if (/[A-Za-z]/.test(letters[j]) && /-?\d+(\.\d*)?(e-?\d+)?$/.test(next)) { setArg(letters[j], next); broken = true; break; } if (letters[j+1] && letters[j+1].match(/\W/)) { setArg(letters[j], arg.slice(j+2)); broken = true; break; } else { setArg(letters[j], flags.strings[letters[j]] ? '' : true); } } var key = arg.slice(-1)[0]; if (!broken && key !== '-') { if (args[i+1] && !/^(-|--)[^-]/.test(args[i+1]) && !flags.bools[key] && (aliases[key] ? !flags.bools[aliases[key]] : true)) { setArg(key, args[i+1]); i++; } else if (args[i+1] && /true|false/.test(args[i+1])) { setArg(key, args[i+1] === 'true'); i++; } else { setArg(key, flags.strings[key] ? '' : true); } } } else { argv._.push( flags.strings['_'] || !isNumber(arg) ? arg : Number(arg) ); } } Object.keys(defaults).forEach(function (key) { if (!hasKey(argv, key.split('.'))) { setKey(argv, key.split('.'), defaults[key]); (aliases[key] || []).forEach(function (x) { setKey(argv, x.split('.'), defaults[key]); }); } }); notFlags.forEach(function(key) { argv._.push(key); }); return argv; }; function hasKey (obj, keys) { var o = obj; keys.slice(0,-1).forEach(function (key) { o = (o[key] || {}); }); var key = keys[keys.length - 1]; return key in o; } function setKey (obj, keys, value) { var o = obj; keys.slice(0,-1).forEach(function (key) { if (o[key] === undefined) o[key] = {}; o = o[key]; }); var key = keys[keys.length - 1]; if (o[key] === undefined || typeof o[key] === 'boolean') { o[key] = value; } else if (Array.isArray(o[key])) { o[key].push(value); } else { o[key] = [ o[key], value ]; } } function isNumber (x) { if (typeof x === 'number') return true; if (/^0x[0-9a-f]+$/i.test(x)) return true; return /^[-+]?(?:\d+(?:\.\d*)?|\.\d+)(e[-+]?\d+)?$/.test(x); } function longest (xs) { return Math.max.apply(null, xs.map(function (x) { return x.length })); }