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which
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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