which.js
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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