const isWindows = process.platform === 'win32' ||
|
process.env.OSTYPE === 'cygwin' ||
|
process.env.OSTYPE === 'msys'
|
|
const path = require('path')
|
const COLON = isWindows ? ';' : ':'
|
const isexe = require('isexe')
|
|
const getNotFoundError = (cmd) =>
|
Object.assign(new Error(`not found: ${cmd}`), { code: 'ENOENT' })
|
|
const getPathInfo = (cmd, opt) => {
|
const colon = opt.colon || COLON
|
|
// If it has a slash, then we don't bother searching the pathenv.
|
// just check the file itself, and that's it.
|
const pathEnv = cmd.match(/\//) || isWindows && cmd.match(/\\/) ? ['']
|
: (
|
[
|
// windows always checks the cwd first
|
...(isWindows ? [process.cwd()] : []),
|
...(opt.path || process.env.PATH ||
|
/* istanbul ignore next: very unusual */ '').split(colon),
|
]
|
)
|
const pathExtExe = isWindows
|
? opt.pathExt || process.env.PATHEXT || '.EXE;.CMD;.BAT;.COM'
|
: ''
|
const pathExt = isWindows ? pathExtExe.split(colon) : ['']
|
|
if (isWindows) {
|
if (cmd.indexOf('.') !== -1 && pathExt[0] !== '')
|
pathExt.unshift('')
|
}
|
|
return {
|
pathEnv,
|
pathExt,
|
pathExtExe,
|
}
|
}
|
|
const which = (cmd, opt, cb) => {
|
if (typeof opt === 'function') {
|
cb = opt
|
opt = {}
|
}
|
if (!opt)
|
opt = {}
|
|
const { pathEnv, pathExt, pathExtExe } = getPathInfo(cmd, opt)
|
const found = []
|
|
const step = i => new Promise((resolve, reject) => {
|
if (i === pathEnv.length)
|
return opt.all && found.length ? resolve(found)
|
: reject(getNotFoundError(cmd))
|
|
const ppRaw = pathEnv[i]
|
const pathPart = /^".*"$/.test(ppRaw) ? ppRaw.slice(1, -1) : ppRaw
|
|
const pCmd = path.join(pathPart, cmd)
|
const p = !pathPart && /^\.[\\\/]/.test(cmd) ? cmd.slice(0, 2) + pCmd
|
: pCmd
|
|
resolve(subStep(p, i, 0))
|
})
|
|
const subStep = (p, i, ii) => new Promise((resolve, reject) => {
|
if (ii === pathExt.length)
|
return resolve(step(i + 1))
|
const ext = pathExt[ii]
|
isexe(p + ext, { pathExt: pathExtExe }, (er, is) => {
|
if (!er && is) {
|
if (opt.all)
|
found.push(p + ext)
|
else
|
return resolve(p + ext)
|
}
|
return resolve(subStep(p, i, ii + 1))
|
})
|
})
|
|
return cb ? step(0).then(res => cb(null, res), cb) : step(0)
|
}
|
|
const whichSync = (cmd, opt) => {
|
opt = opt || {}
|
|
const { pathEnv, pathExt, pathExtExe } = getPathInfo(cmd, opt)
|
const found = []
|
|
for (let i = 0; i < pathEnv.length; i ++) {
|
const ppRaw = pathEnv[i]
|
const pathPart = /^".*"$/.test(ppRaw) ? ppRaw.slice(1, -1) : ppRaw
|
|
const pCmd = path.join(pathPart, cmd)
|
const p = !pathPart && /^\.[\\\/]/.test(cmd) ? cmd.slice(0, 2) + pCmd
|
: pCmd
|
|
for (let j = 0; j < pathExt.length; j ++) {
|
const cur = p + pathExt[j]
|
try {
|
const 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)
|
}
|
|
module.exports = which
|
which.sync = whichSync
|
