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September 14, 2020 10:42
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Ignoring revisions in .git-blame-ignore-revs.
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const isWindows = process.platform === 'win32' ||
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process.env.OSTYPE === 'cygwin' ||
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process.env.OSTYPE === 'msys'
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const path = require('path')
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const COLON = isWindows ? ';' : ':'
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const isexe = require('isexe')
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const getNotFoundError = (cmd) =>
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Object.assign(new Error(`not found: ${cmd}`), { code: 'ENOENT' })
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const getPathInfo = (cmd, opt) => {
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const colon = opt.colon || COLON
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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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const pathEnv = cmd.match(/\//) || isWindows && cmd.match(/\\/) ? ['']
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: (
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[
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// windows always checks the cwd first
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...(isWindows ? [process.cwd()] : []),
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...(opt.path || process.env.PATH ||
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/* istanbul ignore next: very unusual */ '').split(colon),
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]
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)
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const pathExtExe = isWindows
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? opt.pathExt || process.env.PATHEXT || '.EXE;.CMD;.BAT;.COM'
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: ''
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const pathExt = isWindows ? pathExtExe.split(colon) : ['']
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if (isWindows) {
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if (cmd.indexOf('.') !== -1 && pathExt[0] !== '')
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pathExt.unshift('')
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}
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return {
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pathEnv,
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pathExt,
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pathExtExe,
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}
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}
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const 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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if (!opt)
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opt = {}
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const { pathEnv, pathExt, pathExtExe } = getPathInfo(cmd, opt)
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const found = []
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const step = i => new Promise((resolve, reject) => {
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if (i === pathEnv.length)
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return opt.all && found.length ? resolve(found)
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: reject(getNotFoundError(cmd))
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const ppRaw = pathEnv[i]
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const pathPart = /^".*"$/.test(ppRaw) ? ppRaw.slice(1, -1) : ppRaw
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const pCmd = path.join(pathPart, cmd)
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const p = !pathPart && /^\.[\\\/]/.test(cmd) ? cmd.slice(0, 2) + pCmd
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: pCmd
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resolve(subStep(p, i, 0))
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})
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const subStep = (p, i, ii) => new Promise((resolve, reject) => {
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if (ii === pathExt.length)
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return resolve(step(i + 1))
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const ext = pathExt[ii]
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isexe(p + ext, { pathExt: pathExtExe }, (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 resolve(p + ext)
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}
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return resolve(subStep(p, i, ii + 1))
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})
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})
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return cb ? step(0).then(res => cb(null, res), cb) : step(0)
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}
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const whichSync = (cmd, opt) => {
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opt = opt || {}
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const { pathEnv, pathExt, pathExtExe } = getPathInfo(cmd, opt)
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const found = []
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for (let i = 0; i < pathEnv.length; i ++) {
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const ppRaw = pathEnv[i]
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const pathPart = /^".*"$/.test(ppRaw) ? ppRaw.slice(1, -1) : ppRaw
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const pCmd = path.join(pathPart, cmd)
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const p = !pathPart && /^\.[\\\/]/.test(cmd) ? cmd.slice(0, 2) + pCmd
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: pCmd
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for (let j = 0; j < pathExt.length; j ++) {
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const cur = p + pathExt[j]
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try {
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const 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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module.exports = which
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which.sync = whichSync