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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)
-
-
- if (cmd.indexOf('.') !== -1 && pathExt[0] !== '')
- pathExt.unshift('')
- }
-
-
- 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)
- }
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