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