feat: Add port number feature to build command

.gitignore

@@ -1,3 +1,3 @@
 .idea
-.vscode/settings.json
+.vscode/
 .DS_Store

packages/dart_frog_cli/lib/src/commands/build/build.dart

@@ -18,12 +18,19 @@ class BuildCommand extends DartFrogCommand {
   })  : _generator = generator ?? MasonGenerator.fromBundle,
         _prodServerBuilderConstructor =
             prodServerBuilderConstructor ?? ProdServerBuilder.new {
-    argParser.addOption(
-      'dart-version',
-      defaultsTo: 'stable',
-      help: 'The Dart SDK version used to build the Dockerfile, defaults to'
-          ' stable.',
-    );
+    argParser
+      ..addOption(
+        'dart-version',
+        defaultsTo: 'stable',
+        help: 'The Dart SDK version used to build the Dockerfile, defaults to'
+            ' stable.',
+      )
+      ..addOption(
+        'port',
+        abbr: 'p',
+        defaultsTo: '8080',
+        help: 'Which port number the server should start on.',
+      );
   }
 
   final GeneratorBuilder _generator;
@@ -38,11 +45,14 @@ class BuildCommand extends DartFrogCommand {
   @override
   Future<int> run() async {
     final dartVersion = results['dart-version'] as String;
+    final port = (results['port'] as String?) ?? '8080';
+
     final generator = await _generator(dartFrogProdServerBundle);
 
     final builder = _prodServerBuilderConstructor(
       logger: logger,
       dartVersion: dartVersion,
+      port: port,
       workingDirectory: cwd,
       prodServerBundleGenerator: generator,
     );

packages/dart_frog_cli/lib/src/prod_server_builder/prod_server_builder.dart

@@ -8,6 +8,7 @@ import 'package:meta/meta.dart';
 typedef ProdServerBuilderConstructor = ProdServerBuilder Function({
   required Logger logger,
   required String dartVersion,
+  required String port,
   required io.Directory workingDirectory,
   required MasonGenerator prodServerBundleGenerator,
 });
@@ -28,6 +29,7 @@ class ProdServerBuilder {
     required this.dartVersion,
     required this.workingDirectory,
     required this.prodServerBundleGenerator,
+    this.port = '8080',
     @visibleForTesting
     RuntimeCompatibilityCallback? runtimeCompatibilityCallback,
   }) : _ensureRuntimeCompatibility =
@@ -36,6 +38,9 @@ class ProdServerBuilder {
   /// The Dart SDK version used to build the Dockerfile.
   final String dartVersion;
 
+  /// The port number the server should start on.
+  final String port;
+
   /// [Logger] instance used to wrap stdout.
   final Logger logger;
 
@@ -51,15 +56,16 @@ class ProdServerBuilder {
   Future<ExitCode> build() async {
     _ensureRuntimeCompatibility(workingDirectory);
 
-    var vars = <String, dynamic>{
+    final vars = <String, dynamic>{
       'dartVersion': dartVersion,
+      'port': port,
     };
 
     logger.detail('[codegen] running pre-gen...');
     await prodServerBundleGenerator.hooks.preGen(
       vars: vars,
       workingDirectory: workingDirectory.path,
-      onVarsChanged: (v) => vars = v,
+      onVarsChanged: (v) => vars..addAll(v),
     );
 
     logger.detail('[codegen] running generate...');

packages/dart_frog_cli/test/src/commands/build/build_test.dart

@@ -57,6 +57,7 @@ void main() {
         prodServerBuilderConstructor: ({
           required Logger logger,
           required String dartVersion,
+          required String port,
           required Directory workingDirectory,
           required MasonGenerator prodServerBundleGenerator,
         }) {
@@ -87,6 +88,7 @@ void main() {
         prodServerBuilderConstructor: ({
           required Logger logger,
           required String dartVersion,
+          required String port,
           required Directory workingDirectory,
           required MasonGenerator prodServerBundleGenerator,
         }) =>

packages/dart_frog_cli/test/src/prod_server_builder/prod_server_builder_test.dart

@@ -64,19 +64,19 @@ void main() {
         final generatorHooks = _MockGeneratorHooks();
         when(
           () => generatorHooks.preGen(
-            vars: {'dartVersion': 'stable'},
+            vars: {'dartVersion': 'stable', 'port': '8080'},
             workingDirectory: any(named: 'workingDirectory'),
             onVarsChanged: any(named: 'onVarsChanged'),
           ),
         ).thenAnswer((invocation) async {
           (invocation.namedArguments[const Symbol('onVarsChanged')] as void
                   Function(Map<String, dynamic>))
-              .call({'dartVersion': 'stable'});
+              .call({'dartVersion': 'stable', 'port': '8080'});
         });
         when(
           () => generator.generate(
             any(),
-            vars: {'dartVersion': 'stable'},
+            vars: {'dartVersion': 'stable', 'port': '8080'},
             fileConflictResolution: FileConflictResolution.overwrite,
           ),
         ).thenAnswer((_) async => []);