feat: support printing app version via -v/--version CLI flag (#3255)

Author: bhavjsh

lib/main.dart

@@ -1,6 +1,11 @@
+import 'dart:ffi' as ffi;
+import 'dart:io';
+
 import 'package:pslab/providers/sht21_provider.dart';
+import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_screenutil/flutter_screenutil.dart';
+import 'package:package_info_plus/package_info_plus.dart';
 import 'package:provider/provider.dart';
 import 'package:pslab/l10n/app_localizations.dart';
 import 'package:pslab/providers/board_state_provider.dart';
@@ -30,9 +35,22 @@ import 'package:pslab/view/wave_generator_screen.dart';
 import 'package:pslab/view/experiments_screen.dart';
 import 'constants.dart';
 
-void main() {
-  setupLocator();
+void main(List<String> args) async {
   WidgetsFlutterBinding.ensureInitialized();
+
+  if (!kIsWeb &&
+      (Platform.isWindows || Platform.isLinux || Platform.isMacOS) &&
+      args.any((a) => a == '-v' || a == '--version')) {
+    if (Platform.isWindows) {
+      _attachParentConsole();
+    }
+    final info = await PackageInfo.fromPlatform();
+    stdout.writeln('${info.appName} ${info.version}+${info.buildNumber}');
+    await stdout.flush();
+    exit(0);
+  }
+
+  setupLocator();
   runApp(
     MultiProvider(
       providers: [
@@ -157,6 +175,14 @@ class _LocaleAware extends StatelessWidget {
   }
 }
 
+void _attachParentConsole() {
+  const attachParentProcess = 0xFFFFFFFF;
+  final kernel32 = ffi.DynamicLibrary.open('kernel32.dll');
+  final attachConsole = kernel32.lookupFunction<ffi.Int32 Function(ffi.Uint32),
+      int Function(int)>('AttachConsole');
+  attachConsole(attachParentProcess);
+}
+
 void _preCacheImages(BuildContext context) {
   for (final path in instrumentIcons) {
     precacheImage(AssetImage(path), context);

pubspec.lock

@@ -266,7 +266,7 @@ packages:
     source: hosted
     version: "1.3.3"
   ffi:
-    dependency: "direct overridden"
+    dependency: "direct main"
     description:
       name: ffi
       sha256: "6d7fd89431262d8f3125e81b50d3847a091d846eafcd4fdb88dd06f36d705a45"
@@ -1587,5 +1587,5 @@ packages:
     source: hosted
     version: "3.1.3"
 sdks:
-  dart: ">=3.10.3 <4.0.0"
-  flutter: ">=3.41.5"
+  dart: ">=3.11.0 <4.0.0"
+  flutter: ">=3.41.9"

test_integration/screenshots.dart

@@ -19,7 +19,7 @@ void main() async {
 
   group('E2E Group', () {
     testWidgets('Take Screenshots', (tester) async {
-      app.main();
+      app.main([]);
       await tester.pumpAndSettle();
 
       final instrumentsScreenTitle =