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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)
}
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