[pigeon] Remove semicolons from Kotlin generation (flutter#5375)

Callback calls were generating unnecessary semicolons at the end of the line, which was inconsistent with the rest of the file and with Kotlin style in general (as highlighted by experiments with `ktfmt`).

Author: stuartmorgan-g

packages/pigeon/CHANGELOG.md

@@ -1,7 +1,11 @@
+## 13.1.1
+
+* [kotlin] Removes unnecessary `;`s in generated code.
+
 ## 13.1.0
 
 * [swift] Fixes Flutter Api void return error handling.
-  * This shouldn't be breaking for anyone, but if you were incorrectly getting 
+  * This shouldn't be breaking for anyone, but if you were incorrectly getting
     success responses, you may now be failing (correctly).
 * Adds method channel name to error response when channel fails to connect.
 * Reduces code generation duplication.

packages/pigeon/lib/generator_tools.dart

@@ -13,7 +13,7 @@ import 'ast.dart';
 /// The current version of pigeon.
 ///
 /// This must match the version in pubspec.yaml.
-const String pigeonVersion = '13.1.0';
+const String pigeonVersion = '13.1.1';
 
 /// Read all the content from [stdin] to a String.
 String readStdin() {

packages/pigeon/lib/kotlin_generator.dart

@@ -412,17 +412,17 @@ class KotlinGenerator extends StructuredGenerator<KotlinOptions> {
             indent.writeScoped('if (it is List<*>) {', '} ', () {
               indent.writeScoped('if (it.size > 1) {', '} ', () {
                 indent.writeln(
-                    'callback(Result.failure(FlutterError(it[0] as String, it[1] as String, it[2] as String?)));');
+                    'callback(Result.failure(FlutterError(it[0] as String, it[1] as String, it[2] as String?)))');
               }, addTrailingNewline: false);
               if (!func.returnType.isNullable && !func.returnType.isVoid) {
                 indent.addScoped('else if (it[0] == null) {', '} ', () {
                   indent.writeln(
-                      'callback(Result.failure(FlutterError("null-error", "Flutter api returned null value for non-null return value.", "")));');
+                      'callback(Result.failure(FlutterError("null-error", "Flutter api returned null value for non-null return value.", "")))');
                 }, addTrailingNewline: false);
               }
               indent.addScoped('else {', '}', () {
                 if (func.returnType.isVoid) {
-                  indent.writeln('callback(Result.success(Unit));');
+                  indent.writeln('callback(Result.success(Unit))');
                 } else {
                   const String output = 'output';
                   // Nullable enums require special handling.
@@ -436,13 +436,13 @@ class KotlinGenerator extends StructuredGenerator<KotlinOptions> {
                     indent.writeln(
                         'val $output = ${_cast(root, indent, 'it[0]', type: func.returnType)}');
                   }
-                  indent.writeln('callback(Result.success($output));');
+                  indent.writeln('callback(Result.success($output))');
                 }
               });
             }, addTrailingNewline: false);
             indent.addScoped('else {', '} ', () {
               indent.writeln(
-                  'callback(Result.failure(createConnectionError(channelName)));');
+                  'callback(Result.failure(createConnectionError(channelName)))');
             });
           });
         });

packages/pigeon/pubspec.yaml

@@ -2,7 +2,7 @@ name: pigeon
 description: Code generator tool to make communication between Flutter and the host platform type-safe and easier.
 repository: https://github.com/flutter/packages/tree/main/packages/pigeon
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3Apigeon
-version: 13.1.0 # This must match the version in lib/generator_tools.dart
+version: 13.1.1 # This must match the version in lib/generator_tools.dart
 
 environment:
   sdk: ">=2.19.0 <4.0.0"

packages/pigeon/test/kotlin_generator_test.dart

@@ -518,6 +518,8 @@ void main() {
     final String code = sink.toString();
     expect(code, contains('callback: (Result<Unit>) -> Unit'));
     expect(code, contains('callback(Result.success(Unit))'));
+    // Lines should not end in semicolons.
+    expect(code, isNot(contains(RegExp(r';\n'))));
   });
 
   test('gen host void argument api', () {
@@ -1584,6 +1586,6 @@ void main() {
     expect(
         code,
         contains(
-            'callback(Result.failure(createConnectionError(channelName)));'));
+            'callback(Result.failure(createConnectionError(channelName)))'));
   });
 }