// Inside of app-restarter.js
// Create a new child which starts my app
var SingleChild = require('single-child'),
    child = new SingleChild('npm', ['start'], {stdio: [0,1,2]});

// Start my child (and hence my app)
child.start();

// Begin a server which restarts the app when hit
var http = require('http');
http.createServer(function (req, res) {
  // We received a ping, restart the child
  child.restart();

  // Send a NO CONTENT response
  res.writeHead(204);
  res.end();
}).listen(3000);

// Notify the user the server is up
console.log('App Restarter is listening at http://localhost:3000/');

new SingleChild(cmd, [args], [options]);
/**
 * Spawn for a single child. Always guarantees only one child exists
 * @see child_process.spawn
 * @param {String} cmd Command to run
 * @param {String[]} [args] Array of arguments to pass with cmd
 * @param {Object} [options] Options to pass to `spawn` and for ourselves
 * @param {Mixed} [options.killSignal] Signal to pass to `kill` executions
 */

child.start([cb]);
child.restart([cb]);
/**
 * Stop the currently running child and start a new one
 * @param {Function} [cb] Error-first callback that returns *before* the child starts
 * @callback {Error|Null} err Error if there was one
 * @callback {ChildProcess} child Child that was started. Generated by node's child_process#spawn
 */

child.stop([cb]);
child.kill([options], [cb]);
/**
 * Stop the currently running program
 * @param {Object} [options] Options for the kill action
 * @param {Mixed} [options.signal] Signal to use when killing
 * @param {Function} [cb] Callback to run when process has been killed.
 *     Receives same params as node's ChildProcess#exit event
 */

// Create a new child which starts my app
var SingleChild = require('single-child'),
    child = new SingleChild('npm', ['start'], {stdio: [0,1,2]});

// Start my child (and hence my app)
child.start();

// Notify user on start and exit events
child.on('starting', function () {
  console.log('Starting app!');
});
child.on('exited', function () {
  console.log('App exited!');
});

// Begin a server which restarts the app when hit
var http = require('http');
http.createServer(function (req, res) {
  // We received a ping, restart the server
  child.restart();

  // Send a NO CONTENT response
  res.writeHead(204);
  res.end();
}).listen(3000);

// Notify the user the server is up
console.log('App restarter is listening at http://localhost:3000/');