added standalone script to update screenshots

pubspec.yaml

@@ -44,6 +44,7 @@ dependencies:
   vibration: 1.8.1
 
 dev_dependencies:
+  args: 2.5.0
   bloc_test: 9.1.3
   build_runner: 2.4.6
   flutter_native_splash: 2.3.5
@@ -55,6 +56,7 @@ dev_dependencies:
   integration_test:
     sdk: flutter
   lint: 2.1.2
+  logging: 1.2.0
   meta: 1.9.1
   mocktail: 0.3.0
   test: 1.24.3

screenshots/main.dart

@@ -0,0 +1,58 @@
+import 'dart:io';
+import 'dart:typed_data';
+
+import 'package:args/args.dart';
+import 'package:image/image.dart';
+import 'package:logging/logging.dart';
+
+import 'convert_to_store_screenshot.dart';
+import 'models/screenshot_args.dart';
+import 'models/screenshot_layout.dart';
+
+Future<int> main(List<String> args) async {
+  final parser = ArgParser()
+    ..addFlag('verbose', abbr: 'v', help: 'Verbose output.')
+    ..addOption('platform', abbr: 'p', help: 'Device platform.', mandatory: true)
+    ..addOption('device', abbr: 'd', help: 'device_snake_name', mandatory: true);
+  final ArgResults argResults = parser.parse(args);
+
+  if (argResults['verbose'] as bool) {
+    Logger.root.level = Level.ALL;
+  } else {
+    Logger.root.level = Level.INFO;
+  }
+
+  final device = argResults["device"] as String;
+  final platform = argResults["platform"] as String;
+  Directory('screenshots/generated/raw/$platform/$device').listSync().forEach((filePath) async {
+    final screenshotName = filePath.path.split('/').last.replaceAll('.png', '');
+    final screenshotBytes = File(filePath.path).readAsBytesSync();
+    final screenshot = decodePng(Uint8List.fromList(screenshotBytes))!;
+    final topLeftPixel = screenshot.getPixel(0, 0);
+
+    final screenshotArgs = ScreenshotArgs(
+      name: screenshotName,
+      deviceName: device,
+      platformFolder: platform,
+      backgroundColor: (
+        r: topLeftPixel.r.toInt(),
+        g: topLeftPixel.g.toInt(),
+        b: topLeftPixel.b.toInt(),
+        a: topLeftPixel.a.toInt(),
+      ),
+      isDark: filePath.path.contains('dark-'),
+    );
+
+    final file = await File(filePath.path.replaceAll('/raw', '')).create(recursive: true);
+    file.writeAsBytesSync(
+      encodePng(
+        screenshot.convertToStoreScreenshot(
+          args: screenshotArgs,
+          layout: ScreenshotLayout.iphone65inch,
+        ),
+      ),
+    );
+  });
+
+  return 0;
+}