Add --help and --new-window flag and fix --version flag (FreeTubeApp#…

…6455)

* Add --new-window command line flag

* Fix --version flag

* Add --help command line flag

* Update src/main/index.js

Co-authored-by: absidue <48293849+absidue@users.noreply.github.com>

---------

Co-authored-by: Alexander Rosenberg <zanderpkg@pm.me>
Co-authored-by: absidue <48293849+absidue@users.noreply.github.com>

src/main/index.js

@@ -27,11 +27,25 @@ import { generatePoToken } from './poTokenGenerator'
 const brotliDecompressAsync = promisify(brotliDecompress)
 
 if (process.argv.includes('--version')) {
+  console.log(`v${packageDetails.version} Beta`) // eslint-disable-line no-console
+  app.exit()
+} else if (process.argv.includes('--help') || process.argv.includes('-h')) {
+  printHelp()
   app.exit()
 } else {
   runApp()
 }
 
+function printHelp() {
+  // eslint-disable-next-line no-console
+  console.log(`\
+usage: ${process.argv0} [options...] [url]
+Options:
+  --help, -h           show this message, then exit
+  --version            print the current version, then exit
+  --new-window         reuse an existing instance if possible`)
+}
+
 function runApp() {
   /** @type {Set<string>} */
   let ALLOWED_RENDERER_FILES
@@ -246,14 +260,24 @@ function runApp() {
     }
 
     app.on('second-instance', (_, commandLine, __) => {
-      // Someone tried to run a second instance, we should focus our window
+      // Someone tried to run a second instance
       if (typeof commandLine !== 'undefined') {
         const url = getLinkUrl(commandLine)
         if (mainWindow && mainWindow.webContents) {
-          if (mainWindow.isMinimized()) mainWindow.restore()
-          mainWindow.focus()
+          if (commandLine.includes('--new-window')) {
+            // The user wants to create a new window in the existing instance
+            if (url) startupUrl = url
+            createWindow({
+              showWindowNow: true,
+              replaceMainWindow: true,
+            })
+          } else {
+            // Just focus the main window (instead of starting a new instance)
+            if (mainWindow.isMinimized()) mainWindow.restore()
+            mainWindow.focus()
 
-          if (url) mainWindow.webContents.send(IpcChannels.OPEN_URL, url)
+            if (url) mainWindow.webContents.send(IpcChannels.OPEN_URL, url)
+          }
         } else {
           if (url) startupUrl = url
           createWindow()