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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
var fs = require('fs')
var isAbsolute = require('is-absolute')
if (isWindows) {
// On windows, there is no good way to check that a file is executable
isExe = function isExe () { return true }
} else {
isExe = function isExe (mod, uid, gid) {
var ret = (mod & 0001)
|| (mod & 0010) && process.getgid && gid === process.getgid()
|| (mod & 0100) && process.getuid && uid === process.getuid()
|| (mod & 0110) && process.getuid && 0 === process.getuid()
if (process.getgroups && (mod & 0010)) {
var groups = process.getgroups()
for (var g = 0; g < groups.length; g++) {
if (groups[g] === gid)
return true
}
}
return ret
}
}
function which (cmd, opt, cb) {
if (typeof opt === 'function') {
cb = opt
opt = {}
}
var colon = opt.colon || COLON
var pathEnv = opt.path || process.env.PATH || ''
var pathExt = ['']
// On windows, env.Path is common.
if (isWindows && !pathEnv) {
var k = Object.keys(process.env)
for (var p = 0; p < k.length; p++) {
if (p.toLowerCase() === 'path') {
pathEnv = process.env[p]
break
}
}
}
pathEnv = pathEnv.split(colon)
if (isWindows) {
pathEnv.unshift(process.cwd())
pathExt = (opt.pathExt || process.env.PATHEXT || '.EXE').split(colon)
if (cmd.indexOf('.') !== -1 && pathExt[0] !== '')
pathExt.unshift('')
}
// If it's absolute, then we don't bother searching the pathenv.
// just check the file itself, and that's it.
if (isAbsolute(cmd))
pathEnv = ['']
;(function F (i, l) {
if (i === l) return cb(new Error('not found: '+cmd))
var p = path.resolve(pathEnv[i], cmd)
;(function E (ii, ll) {
if (ii === ll) return F(i + 1, l)
var ext = pathExt[ii]
fs.stat(p + ext, function (er, stat) {
if (!er &&
stat.isFile() &&
isExe(stat.mode, stat.uid, stat.gid)) {
return cb(null, p + ext)
}
return E(ii + 1, ll)
})
})(0, pathExt.length)
})(0, pathEnv.length)
}
function whichSync (cmd, opt) {
if (!opt)
opt = {}
var colon = opt.colon || COLON
var pathEnv = opt.path || process.env.PATH || ''
var pathExt = ['']
// On windows, env.Path is common.
if (isWindows && !pathEnv) {
var k = Object.keys(process.env)
for (var p = 0; p < k.length; p++) {
if (p.toLowerCase() === 'path') {
pathEnv = process.env[p]
break
}
}
}
pathEnv = pathEnv.split(colon)
if (isWindows) {
pathEnv.unshift(process.cwd())
pathExt = (opt.pathExt || process.env.PATHEXT || '.EXE').split(colon)
if (cmd.indexOf('.') !== -1 && pathExt[0] !== '')
pathExt.unshift('')
}
// If it's absolute, then we don't bother searching the pathenv.
// just check the file itself, and that's it.
if (isAbsolute(cmd))
pathEnv = ['']
for (var i = 0, l = pathEnv.length; i < l; i ++) {
var p = path.join(pathEnv[i], cmd)
for (var j = 0, ll = pathExt.length; j < ll; j ++) {
var cur = p + pathExt[j]
var stat
try {
stat = fs.statSync(cur)
if (stat.isFile() && isExe(stat.mode, stat.uid, stat.gid))
return cur
} catch (ex) {}
}
}
throw new Error('not found: '+cmd)
}
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