Handle squirrel events for Windows installer

app.js

@@ -1,3 +1,10 @@
+ //handle setupevents as quickly as possible
+ const setupEvents = require('./installers/setupEvents')
+ if (setupEvents.handleSquirrelEvent()) {
+    // squirrel event handled and app will exit in 1000ms, so don't do anything else
+    return;
+ }
+
 const electron = require('electron')
 const contextMenu = require('electron-context-menu');
 const path = require('path')

installers/setupEvents.js

@@ -0,0 +1,67 @@
+const electron = require('electron')
+const app = electron.app
+
+module.exports = {
+  handleSquirrelEvent: function () {
+    if (process.argv.length === 1) {
+      return false;
+    }
+
+    const ChildProcess = require('child_process');
+    const path = require('path');
+
+    const appFolder = path.resolve(process.execPath, '..');
+    const rootAtomFolder = path.resolve(appFolder, '..');
+    const updateDotExe = path.resolve(path.join(rootAtomFolder, 'Update.exe'));
+    const exeName = path.basename(process.execPath);
+    const spawn = function (command, args) {
+      let spawnedProcess, error;
+
+      try {
+        spawnedProcess = ChildProcess.spawn(command, args, {
+          detached: true
+        });
+      } catch (error) {}
+
+      return spawnedProcess;
+    };
+
+    const spawnUpdate = function (args) {
+      return spawn(updateDotExe, args);
+    };
+
+    const squirrelEvent = process.argv[1];
+    switch (squirrelEvent) {
+      case '--squirrel-install':
+      case '--squirrel-updated':
+        // Optionally do things such as:
+        // - Add your .exe to the PATH
+        // - Write to the registry for things like file associations and
+        // explorer context menus
+
+        // Install desktop and start menu shortcuts
+        spawnUpdate(['--createShortcut', exeName]);
+
+        setTimeout(app.quit, 1000);
+        return true;
+
+      case '--squirrel-uninstall':
+        // Undo anything you did in the --squirrel-install and
+        // --squirrel-updated handlers
+
+        // Remove desktop and start menu shortcuts
+        spawnUpdate(['--removeShortcut', exeName]);
+
+        setTimeout(app.quit, 1000);
+        return true;
+
+      case '--squirrel-obsolete':
+        // This is called on the outgoing version of your app before
+        // we update to the new version - it's the opposite of
+        // --squirrel-updated
+
+        app.quit();
+        return true;
+    }
+  }
+}