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index.js
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index.js
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'use strict';
var child_process = require('child_process');
var crossSpawn = require('cross-spawn');
var ChildProcessPromise = require('./ChildProcessPromise');
var ChildProcessError = require('./ChildProcessError');
var slice = Array.prototype.slice;
/**
* Promise wrapper for exec, execFile
*
* @param {String} method
* @param {...*} args
* @return {Promise}
*/
function doExec(method, args) {
var cp;
var cpPromise = new ChildProcessPromise();
var reject = cpPromise._cpReject;
var resolve = cpPromise._cpResolve;
var finalArgs = slice.call(args, 0);
finalArgs.push(callback);
cp = child_process[method].apply(child_process, finalArgs);
function callback(err, stdout, stderr) {
if (err) {
var commandStr = args[0] + (Array.isArray(args[1]) ? (' ' + args[1].join(' ')) : '');
err.message += ' `' + commandStr + '` (exited with error code ' + err.code + ')';
err.stdout = stdout;
err.stderr = stderr;
var cpError = new ChildProcessError(err.message, err.code, child_process, stdout, stderr);
reject(cpError);
} else {
resolve({
childProcess: cp,
stdout: stdout,
stderr: stderr
});
}
}
cpPromise.childProcess = cp;
return cpPromise;
}
/**
* `exec` as Promised
*
* @param {String} command
* @param {Object} options
* @return {Promise}
*/
function exec() {
return doExec('exec', arguments);
}
/**
* `execFile` as Promised
*
* @param {String} command
* @param {Array} args
* @param {Object} options
* @return {Promise}
*/
function execFile() {
return doExec('execFile', arguments);
}
/**
* `spawn` as Promised
*
* @param {String} command
* @param {Array} args
* @param {Object} options
* @return {Promise}
*/
function doSpawn(method, command, args, options) {
var result = {};
var cp;
var cpPromise = new ChildProcessPromise();
var reject = cpPromise._cpReject;
var resolve = cpPromise._cpResolve;
var successfulExitCodes = (options && options.successfulExitCodes) || [0];
cp = method(command, args, options);
// Don't return the whole Buffered result by default.
var captureStdout = false;
var captureStderr = false;
var capture = options && options.capture;
if (capture) {
for (var i = 0, len = capture.length; i < len; i++) {
var cur = capture[i];
if (cur === 'stdout') {
captureStdout = true;
} else if (cur === 'stderr') {
captureStderr = true;
}
}
}
result.childProcess = cp;
if (captureStdout) {
result.stdout = '';
cp.stdout.on('data', function(data) {
result.stdout += data;
});
}
if (captureStderr) {
result.stderr = '';
cp.stderr.on('data', function(data) {
result.stderr += data;
});
}
cp.on('error', reject);
cp.on('close', function(code) {
if (successfulExitCodes.indexOf(code) === -1) {
var commandStr = command + (args.length ? (' ' + args.join(' ')) : '');
var message = '`' + commandStr + '` failed with code ' + code;
var err = new ChildProcessError(message, code, cp);
if (captureStderr) {
err.stderr = result.stderr.toString();
}
if (captureStdout) {
err.stdout = result.stdout.toString();
}
reject(err);
} else {
result.code = code;
resolve(result);
}
});
cpPromise.childProcess = cp;
return cpPromise;
}
function spawn(command, args, options) {
return doSpawn(crossSpawn, command, args, options);
}
function fork(modulePath, args, options) {
return doSpawn(child_process.fork, modulePath, args, options);
}
exports.exec = exec;
exports.execFile = execFile;
exports.spawn = spawn;
exports.fork = fork;