prevent more than one instance

app/src/index.ts

 import { spawn, exec } from 'child_process'
-import { app, autoUpdater, dialog, Tray, Menu, nativeTheme } from 'electron'
+import { app, autoUpdater, dialog, Tray, Menu, nativeTheme, Notification } from 'electron'
 import * as path from 'path'
 import * as fs from 'fs'
 
 require('@electron/remote/main').initialize()
 
 let tray: Tray | null = null
+let secondInstance: Boolean = false
+const SingleInstanceLock = app.requestSingleInstanceLock()
 
 const createSystemtray = () => {
   let brightModeIconPath = path.join(__dirname, '..', '..', 'assets', 'ollama_icon_dark_16x16.png')
@@ -108,11 +110,10 @@ function installCLI() {
     })
 }
 
-// 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', () => {
-
+if (!SingleInstanceLock) {  
+  app.quit()
+} else {
+  app.on('ready', () => {
     if (process.platform === 'darwin') {
       app.dock.hide()
   
@@ -153,7 +154,9 @@ app.on('ready', () => {
     if (app.isPackaged) {
       installCLI()
     }
-})
+  })
+}
+
 
 // Quit when all windows are closed, except on macOS. There, it's common
 // for applications and their menu bar to stay active until the user quits