index.js

'use strict';
const app = require('app');
const BrowserWindow = require('browser-window');
const Menu = require('menu')
const template = require('./scripts/menu')

// report crashes to the Electron project
require('crash-reporter').start();

// adds debug features like hotkeys for triggering dev tools and reload
require('electron-debug')();

// prevent window being garbage collected
let mainWindow;
var menu = Menu.buildFromTemplate(template);

function onClosed() {
	// dereference the window
	// for multiple windows store them in an array
	mainWindow = null;
}

function createMainWindow() {
	const is2nd = process.argv.indexOf('--2nd') >= 0;
	var opts = {
		width: 1200,
		height: 600,
		'accept-first-mouse': true,
		'title-bar-style': 'hidden'
	};
  if (is2nd) {
    setOptsForDualScreen(opts);
  }

	const win = new BrowserWindow(opts);
	if (process.env.DEV) {
		win.loadURL('http://localhost:8000/dev.html');
		win.openDevTools();
	} else {
		win.loadURL(`file://${__dirname}/index.html`);
	}
	win.on('closed', onClosed);

	if (menu) {
		Menu.setApplicationMenu(menu);
		menu = null;
	}

	return win;
}

function setOptsForDualScreen(opts) {
  var atomScreen = require('screen');
  var displays = atomScreen.getAllDisplays();
  var d2 = displays.length > 1 ? displays[1] : null;
  if (d2) {
    opts.x = d2.bounds.x + (d2.size.width - opts.width) / 2;
    opts.y = d2.bounds.y + (d2.size.height - opts.height) / 2;
  }
}

app.on('window-all-closed', () => {
	app.quit();
});

app.on('activate-with-no-open-windows', () => {
	if (!mainWindow) {
		mainWindow = createMainWindow();
	}
});

app.on('ready', () => {
	mainWindow = createMainWindow();

	if (process.env.DEV) {
		const watcher = require('./scripts/watcher.js');
		watcher.watch(app, ['./index.js', './scripts']);
	}
});