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proc
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self
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root
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usr
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lib
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node_modules
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npm
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node_modules
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which
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Filename :
which.js
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module.exports = which which.sync = whichSync var isWindows = process.platform === 'win32' || process.env.OSTYPE === 'cygwin' || process.env.OSTYPE === 'msys' var path = require('path') var COLON = isWindows ? ';' : ':' var isexe = require('isexe') function getNotFoundError (cmd) { var er = new Error('not found: ' + cmd) er.code = 'ENOENT' return er } function getPathInfo (cmd, opt) { var colon = opt.colon || COLON var pathEnv = opt.path || process.env.PATH || '' var pathExt = [''] pathEnv = pathEnv.split(colon) var pathExtExe = '' if (isWindows) { pathEnv.unshift(process.cwd()) pathExtExe = (opt.pathExt || process.env.PATHEXT || '.EXE;.CMD;.BAT;.COM') pathExt = pathExtExe.split(colon) // Always test the cmd itself first. isexe will check to make sure // it's found in the pathExt set. if (cmd.indexOf('.') !== -1 && pathExt[0] !== '') pathExt.unshift('') } // If it has a slash, then we don't bother searching the pathenv. // just check the file itself, and that's it. if (cmd.match(/\//) || isWindows && cmd.match(/\\/)) pathEnv = [''] return { env: pathEnv, ext: pathExt, extExe: pathExtExe } } function which (cmd, opt, cb) { if (typeof opt === 'function') { cb = opt opt = {} } var info = getPathInfo(cmd, opt) var pathEnv = info.env var pathExt = info.ext var pathExtExe = info.extExe var found = [] ;(function F (i, l) { if (i === l) { if (opt.all && found.length) return cb(null, found) else return cb(getNotFoundError(cmd)) } var pathPart = pathEnv[i] if (pathPart.charAt(0) === '"' && pathPart.slice(-1) === '"') pathPart = pathPart.slice(1, -1) var p = path.join(pathPart, cmd) if (!pathPart && (/^\.[\\\/]/).test(cmd)) { p = cmd.slice(0, 2) + p } ;(function E (ii, ll) { if (ii === ll) return F(i + 1, l) var ext = pathExt[ii] isexe(p + ext, { pathExt: pathExtExe }, function (er, is) { if (!er && is) { if (opt.all) found.push(p + ext) else return cb(null, p + ext) } return E(ii + 1, ll) }) })(0, pathExt.length) })(0, pathEnv.length) } function whichSync (cmd, opt) { opt = opt || {} var info = getPathInfo(cmd, opt) var pathEnv = info.env var pathExt = info.ext var pathExtExe = info.extExe var found = [] for (var i = 0, l = pathEnv.length; i < l; i ++) { var pathPart = pathEnv[i] if (pathPart.charAt(0) === '"' && pathPart.slice(-1) === '"') pathPart = pathPart.slice(1, -1) var p = path.join(pathPart, cmd) if (!pathPart && /^\.[\\\/]/.test(cmd)) { p = cmd.slice(0, 2) + p } for (var j = 0, ll = pathExt.length; j < ll; j ++) { var cur = p + pathExt[j] var is try { is = isexe.sync(cur, { pathExt: pathExtExe }) if (is) { if (opt.all) found.push(cur) else return cur } } catch (ex) {} } } if (opt.all && found.length) return found if (opt.nothrow) return null throw getNotFoundError(cmd) }