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'use strict';

const childProcess = require('child_process');

const util = require('util');

const crossSpawn = require('cross-spawn');

const stripEof = require('strip-eof');

const npmRunPath = require('npm-run-path');

const isStream = require('is-stream');

const _getStream = require('get-stream');

const pFinally = require('p-finally');

const onExit = require('signal-exit');

const errname = require('./lib/errname');

const stdio = require('./lib/stdio');

const TEN_MEGABYTES = 1000 * 1000 * 10;

function handleArgs(cmd, args, opts) {

let parsed;

if (opts && opts.env && opts.extendEnv !== false) {

opts.env = Object.assign({}, process.env, opts.env);

}

if (opts && opts.__winShell === true) {

delete opts.__winShell;

parsed = {

command: cmd,

args,

options: opts,

file: cmd,

original: cmd

};

} else {

parsed = crossSpawn._parse(cmd, args, opts);

}

opts = Object.assign({

maxBuffer: TEN_MEGABYTES,

stripEof: true,

preferLocal: true,

localDir: parsed.options.cwd || process.cwd(),

encoding: 'utf8',

reject: true,

cleanup: true

}, parsed.options);

opts.stdio = stdio(opts);

if (opts.preferLocal) {

opts.env = npmRunPath.env(Object.assign({}, opts, {cwd: opts.localDir}));

}

return {

cmd: parsed.command,

args: parsed.args,

opts,

parsed

};

}

function handleInput(spawned, opts) {

const input = opts.input;

if (input === null || input === undefined) {

return;

}

if (isStream(input)) {

input.pipe(spawned.stdin);

} else {

spawned.stdin.end(input);

}

}

function handleOutput(opts, val) {

if (val && opts.stripEof) {

val = stripEof(val);

}

return val;

}

function handleShell(fn, cmd, opts) {

let file = '/bin/sh';

let args = ['-c', cmd];

opts = Object.assign({}, opts);

if (process.platform === 'win32') {

opts.__winShell = true;

file = process.env.comspec || 'cmd.exe';

args = ['/s', '/c', `"${cmd}"`];

opts.windowsVerbatimArguments = true;

}

if (opts.shell) {

file = opts.shell;

delete opts.shell;

}

return fn(file, args, opts);

}

function getStream(process, stream, encoding, maxBuffer) {

if (!process[stream]) {

return null;

}

let ret;

if (encoding) {

ret = _getStream(process[stream], {

encoding,

maxBuffer

});

} else {

ret = _getStream.buffer(process[stream], {maxBuffer});

}

return ret.catch(err => {

err.stream = stream;

err.message = `${stream} ${err.message}`;

throw err;

});

}

module.exports = (cmd, args, opts) => {

let joinedCmd = cmd;

if (Array.isArray(args) && args.length > 0) {

joinedCmd += ' ' + args.join(' ');

}

const parsed = handleArgs(cmd, args, opts);

const encoding = parsed.opts.encoding;

const maxBuffer = parsed.opts.maxBuffer;

let spawned;

try {

spawned = childProcess.spawn(parsed.cmd, parsed.args, parsed.opts);

} catch (err) {

return Promise.reject(err);

}

let removeExitHandler;

if (parsed.opts.cleanup) {

removeExitHandler = onExit(() => {

spawned.kill();

});

}

let timeoutId = null;

let timedOut = false;

const cleanupTimeout = () => {

if (timeoutId) {

clearTimeout(timeoutId);

timeoutId = null;

}

};

if (parsed.opts.timeout > 0) {

timeoutId = setTimeout(() => {

timeoutId = null;

timedOut = true;

spawned.kill(parsed.opts.killSignal);

}, parsed.opts.timeout);

}

const processDone = new Promise(resolve => {

spawned.on('exit', (code, signal) => {

cleanupTimeout();

resolve({code, signal});

});

spawned.on('error', err => {

cleanupTimeout();

resolve({err});

});

if (spawned.stdin) {

spawned.stdin.on('error', err => {

cleanupTimeout();

resolve({err});

});

}

});

function destroy() {

if (spawned.stdout) {

spawned.stdout.destroy();

}

if (spawned.stderr) {

spawned.stderr.destroy();

}

}

const promise = pFinally(Promise.all([

processDone,

getStream(spawned, 'stdout', encoding, maxBuffer),

getStream(spawned, 'stderr', encoding, maxBuffer)

]).then(arr => {

const result = arr[0];

const stdout = arr[1];

const stderr = arr[2];

let err = result.err;

const code = result.code;

const signal = result.signal;

if (removeExitHandler) {

removeExitHandler();

}

if (err || code !== 0 || signal !== null) {

if (!err) {

let output = '';

if (Array.isArray(parsed.opts.stdio)) {

if (parsed.opts.stdio[2] !== 'inherit') {

output += output.length > 0 ? stderr : `\n${stderr}`;

}

if (parsed.opts.stdio[1] !== 'inherit') {

output += `\n${stdout}`;

}

} else if (parsed.opts.stdio !== 'inherit') {

output = `\n${stderr}${stdout}`;

}

err = new Error(`Command failed: ${joinedCmd}${output}`);

err.code = code < 0 ? errname(code) : code;

}

// TODO: missing some timeout logic for killed

// https://github.com/nodejs/node/blob/master/lib/child_process.js#L203

// err.killed = spawned.killed || killed;

err.killed = err.killed || spawned.killed;

err.stdout = stdout;

err.stderr = stderr;

err.failed = true;

err.signal = signal || null;

err.cmd = joinedCmd;

err.timedOut = timedOut;

if (!parsed.opts.reject) {

return err;

}

throw err;

}

return {

stdout: handleOutput(parsed.opts, stdout),

stderr: handleOutput(parsed.opts, stderr),

code: 0,

failed: false,

killed: false,

signal: null,

cmd: joinedCmd,

timedOut: false

};

}), destroy);

crossSpawn._enoent.hookChildProcess(spawned, parsed.parsed);

handleInput(spawned, parsed.opts);

spawned.then = promise.then.bind(promise);

spawned.catch = promise.catch.bind(promise);

return spawned;

};

module.exports.stdout = function () {

// TODO: set `stderr: 'ignore'` when that option is implemented

return module.exports.apply(null, arguments).then(x => x.stdout);

};

module.exports.stderr = function () {

// TODO: set `stdout: 'ignore'` when that option is implemented

return module.exports.apply(null, arguments).then(x => x.stderr);

};

module.exports.shell = (cmd, opts) => handleShell(module.exports, cmd, opts);

module.exports.sync = (cmd, args, opts) => {

const parsed = handleArgs(cmd, args, opts);

if (isStream(parsed.opts.input)) {

throw new TypeError('The `input` option cannot be a stream in sync mode');

}

const result = childProcess.spawnSync(parsed.cmd, parsed.args, parsed.opts);

if (result.error || result.status !== 0) {

throw (result.error || new Error(result.stderr === '' ? result.stdout : result.stderr));

}

result.stdout = handleOutput(parsed.opts, result.stdout);

result.stderr = handleOutput(parsed.opts, result.stderr);

return result;

};

module.exports.shellSync = (cmd, opts) => handleShell(module.exports.sync, cmd, opts);

module.exports.spawn = util.deprecate(module.exports, 'execa.spawn() is deprecated. Use execa() instead.');