main.js

const electron = require('electron');
const app = electron.app;
const ipc = electron.ipcMain;
const BrowserWindow = electron.BrowserWindow;
const Menu = electron.Menu;

const path = require('path');
const url = require('url');

const getPlatform = require('./platforms');
const platform = getPlatform(process.platform);
const debug = /--debug/.test(process.argv[2]);

// Keep a global reference of the window object, if you don't, the window will
// be closed automatically when the JavaScript object is garbage collected.
let appWindow;

function createWindow () {
  // Create the browser window.
  appWindow = new BrowserWindow({width: 180, height: 200, icon: path.join(__dirname, 'assets/app-icon/sleep.png')});

  // and load the index.html of the app.
  appWindow.loadURL(url.format({
    pathname: path.join(__dirname, 'index.html'),
    protocol: 'file:',
    slashes: true
  }));

  // Open the DevTools.
  if (debug) {
    appWindow.webContents.openDevTools();
    appWindow.maximize();
  }

  // Emitted when the window is closed.
  appWindow.on('closed', function () {
    // Dereference the window object, usually you would store windows
    // in an array if your app supports multi windows, this is the time
    // when you should delete the corresponding element.
    appWindow = null
  })
}

const shouldQuit = app.makeSingleInstance((commandLine, workingDirectory) => {
  // Someone tried to run a second instance, we should focus our window.
  if (appWindow) {
    if (appWindow.isMinimized()) appWindow.restore();
    appWindow.focus();
  }
});

if (shouldQuit) {
  app.quit();
}

// This method will be called when Electron has finished
// initialization and is ready to create browser windows.
// Some APIs can only be used after this event occurs.
app.on('ready', () => {
  createWindow();
});

// Quit when all windows are closed.
app.on('window-all-closed', function () {
  // On OS X it is common for applications and their menu bar
  // to stay active until the user quits explicitly with Cmd + Q
  // if (process.platform !== 'darwin') {
    app.quit();
  // }
});

app.on('activate', function () {
  // On OS X it's common to re-create a window in the app when the
  // dock icon is clicked and there are no other windows open.
  if (appWindow === null) {
    createWindow()
  }
});

ipc.on('sleep', function (event) {
  const callback = (err, stdout, stderr) => {
    if (stdout) {
      console.log(stdout);
    }
    if (stderr) {
      console.log(stderr);
    }
  };
  platform.sleep(callback);
});