196 lines
5.1 KiB
JavaScript
196 lines
5.1 KiB
JavaScript
'use strict'
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const { spawn } = require('child_process')
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const os = require('os')
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const which = require('which')
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const escape = require('./escape.js')
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// 'extra' object is for decorating the error a bit more
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const promiseSpawn = (cmd, args, opts = {}, extra = {}) => {
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if (opts.shell) {
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return spawnWithShell(cmd, args, opts, extra)
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}
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let proc
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const p = new Promise((res, rej) => {
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proc = spawn(cmd, args, opts)
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const stdout = []
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const stderr = []
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const reject = er => rej(Object.assign(er, {
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cmd,
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args,
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...stdioResult(stdout, stderr, opts),
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...extra,
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}))
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proc.on('error', reject)
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if (proc.stdout) {
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proc.stdout.on('data', c => stdout.push(c)).on('error', reject)
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proc.stdout.on('error', er => reject(er))
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}
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if (proc.stderr) {
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proc.stderr.on('data', c => stderr.push(c)).on('error', reject)
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proc.stderr.on('error', er => reject(er))
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}
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proc.on('close', (code, signal) => {
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const result = {
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cmd,
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args,
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code,
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signal,
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...stdioResult(stdout, stderr, opts),
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...extra,
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}
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if (code || signal) {
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rej(Object.assign(new Error('command failed'), result))
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} else {
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res(result)
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}
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})
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})
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p.stdin = proc.stdin
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p.process = proc
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return p
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}
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const spawnWithShell = (cmd, args, opts, extra) => {
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let command = opts.shell
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// if shell is set to true, we use a platform default. we can't let the core
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// spawn method decide this for us because we need to know what shell is in use
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// ahead of time so that we can escape arguments properly. we don't need coverage here.
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if (command === true) {
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// istanbul ignore next
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command = process.platform === 'win32' ? process.env.ComSpec : 'sh'
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}
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const options = { ...opts, shell: false }
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const realArgs = []
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let script = cmd
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// first, determine if we're in windows because if we are we need to know if we're
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// running an .exe or a .cmd/.bat since the latter requires extra escaping
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const isCmd = /(?:^|\\)cmd(?:\.exe)?$/i.test(command)
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if (isCmd) {
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let doubleEscape = false
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// find the actual command we're running
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let initialCmd = ''
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let insideQuotes = false
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for (let i = 0; i < cmd.length; ++i) {
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const char = cmd.charAt(i)
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if (char === ' ' && !insideQuotes) {
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break
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}
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initialCmd += char
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if (char === '"' || char === "'") {
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insideQuotes = !insideQuotes
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}
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}
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let pathToInitial
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try {
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pathToInitial = which.sync(initialCmd, {
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path: (options.env && options.env.PATH) || process.env.PATH,
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pathext: (options.env && options.env.PATHEXT) || process.env.PATHEXT,
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}).toLowerCase()
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} catch (err) {
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pathToInitial = initialCmd.toLowerCase()
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}
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doubleEscape = pathToInitial.endsWith('.cmd') || pathToInitial.endsWith('.bat')
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for (const arg of args) {
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script += ` ${escape.cmd(arg, doubleEscape)}`
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}
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realArgs.push('/d', '/s', '/c', script)
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options.windowsVerbatimArguments = true
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} else {
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for (const arg of args) {
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script += ` ${escape.sh(arg)}`
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}
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realArgs.push('-c', script)
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}
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return promiseSpawn(command, realArgs, options, extra)
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}
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// open a file with the default application as defined by the user's OS
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const open = (_args, opts = {}, extra = {}) => {
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const options = { ...opts, shell: true }
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const args = [].concat(_args)
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let platform = process.platform
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// process.platform === 'linux' may actually indicate WSL, if that's the case
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// we want to treat things as win32 anyway so the host can open the argument
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if (platform === 'linux' && os.release().toLowerCase().includes('microsoft')) {
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platform = 'win32'
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}
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let command = options.command
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if (!command) {
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if (platform === 'win32') {
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// spawnWithShell does not do the additional os.release() check, so we
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// have to force the shell here to make sure we treat WSL as windows.
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options.shell = process.env.ComSpec
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// also, the start command accepts a title so to make sure that we don't
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// accidentally interpret the first arg as the title, we stick an empty
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// string immediately after the start command
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command = 'start ""'
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} else if (platform === 'darwin') {
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command = 'open'
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} else {
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command = 'xdg-open'
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}
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}
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return spawnWithShell(command, args, options, extra)
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}
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promiseSpawn.open = open
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const isPipe = (stdio = 'pipe', fd) => {
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if (stdio === 'pipe' || stdio === null) {
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return true
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}
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if (Array.isArray(stdio)) {
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return isPipe(stdio[fd], fd)
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}
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return false
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}
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const stdioResult = (stdout, stderr, { stdioString = true, stdio }) => {
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const result = {
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stdout: null,
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stderr: null,
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}
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// stdio is [stdin, stdout, stderr]
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if (isPipe(stdio, 1)) {
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result.stdout = Buffer.concat(stdout)
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if (stdioString) {
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result.stdout = result.stdout.toString().trim()
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}
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}
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if (isPipe(stdio, 2)) {
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result.stderr = Buffer.concat(stderr)
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if (stdioString) {
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result.stderr = result.stderr.toString().trim()
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}
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}
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return result
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}
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module.exports = promiseSpawn
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