feat(shorebird_cli): expose --dart-define directly in shorebird run (#693)

Signed-off-by: Hemanth Krishna <hkpdev008@gmail.com>
Co-authored-by: Felix Angelov <felix@shorebird.dev>

packages/shorebird_cli/lib/src/commands/run_command.dart

@@ -24,6 +24,15 @@ class RunCommand extends ShorebirdCommand
         abbr: 't',
         help: 'The main entrypoint file of the application.',
       )
+      ..addMultiOption(
+        'dart-define',
+        help: 'Additional key-value pairs that will be available as constants '
+            '''from the String.fromEnvironment, bool.fromEnvironment, and int.fromEnvironment '''
+            'constructors.\n'
+            '''Multiple defines can be passed by repeating "--dart-define" multiple times.''',
+        splitCommas: false,
+        valueHelp: 'foo=bar',
+      )
       ..addOption(
         'flavor',
         help: 'The product flavor to use when building the app.',
@@ -52,6 +61,7 @@ class RunCommand extends ShorebirdCommand
     final deviceId = results['device-id'] as String?;
     final flavor = results['flavor'] as String?;
     final target = results['target'] as String?;
+    final dartDefines = results['dart-define'] as List<String>?;
     final flutter = await process.start(
       'flutter',
       [
@@ -61,6 +71,7 @@ class RunCommand extends ShorebirdCommand
         if (deviceId != null) '--device-id=$deviceId',
         if (flavor != null) '--flavor=$flavor',
         if (target != null) '--target=$target',
+        if (dartDefines != null) ...dartDefines.map((e) => '--dart-define=$e'),
         ...results.rest
       ],
       runInShell: true,

packages/shorebird_cli/test/src/commands/run_command_test.dart

@@ -179,9 +179,11 @@ void main() {
       const deviceId = 'test-device-id';
       const flavor = 'development';
       const target = './lib/main_development.dart';
+      const dartDefines = ['FOO=BAR', 'BAZ=QUX'];
       when(() => argResults['device-id']).thenReturn(deviceId);
       when(() => argResults['flavor']).thenReturn(flavor);
       when(() => argResults['target']).thenReturn(target);
+      when(() => argResults['dart-define']).thenReturn(dartDefines);
 
       when(() => process.stdout).thenAnswer((_) => const Stream.empty());
       when(() => process.stderr).thenAnswer((_) => const Stream.empty());
@@ -209,6 +211,8 @@ void main() {
           '--device-id=$deviceId',
           '--flavor=$flavor',
           '--target=$target',
+          '--dart-define=${dartDefines[0]}',
+          '--dart-define=${dartDefines[1]}',
         ]),
       );