[pigeon] updated readme and made version 0.2.2 (#372)

packages/pigeon/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.2.2
+
+* Added support for enums.
+
 ## 0.2.1
 
 * Java: Fixed issue where multiple async HostApis can generate multiple Result interfaces.

packages/pigeon/README.md

@@ -70,7 +70,9 @@ Nested data-types are supported, too.
 
 Note: Generics for List and Map aren't supported yet.
 
-## Asynchronous Handlers
+## Features
+
+### Asynchronous Handlers
 
 By default Pigeon will generate synchronous handlers for messages.  If you want
 to be able to respond to a message asynchronously you can use the `@async`
@@ -112,7 +114,7 @@ public interface Api2Host {
 }
 ```
 
-## Null Safety (NNBD)
+### Null Safety (NNBD)
 
 Right now Pigeon supports generating null-safe code, but it doesn't yet support
 [non-null fields](https://github.com/flutter/flutter/issues/59118).
@@ -121,6 +123,57 @@ The default is to generate null-safe code but in order to generate non-null-safe
 code run Pigeon with the extra argument `--no-dart_null_safety`. For example:
 `flutter pub run pigeon --input ./pigeons/messages.dart --no-dart_null_safety --dart_out stdout`.
 
+### Enums
+
+As of version 0.2.2 Pigeon supports enum generation.  For example:
+```dart
+enum State {
+  pending,
+  success,
+  error,
+}
+
+class StateResult {
+  String? errorMessage;
+  State? state;
+}
+
+@HostApi()
+abstract class Api {
+  StateResult queryState();
+}
+```
+
+Generates on Dart, Java, Objective-C:
+```dart
+enum State {
+  pending,
+  success,
+  error,
+}
+```
+
+```java
+public enum State {
+   pending(0),
+   success(1),
+   error(2);
+
+   private int index;
+   private State(final int index) {
+     this.index = index;
+   }
+}
+```
+
+```objc
+typedef NS_ENUM(NSUInteger, State) {
+  StatePending = 0,
+  StateSuccess = 1,
+  StateError = 2,
+};
+```
+
 ## Feedback
 
 File an issue in [flutter/flutter](https://github.com/flutter/flutter) with the

packages/pigeon/lib/generator_tools.dart

@@ -8,7 +8,7 @@ import 'dart:mirrors';
 import 'ast.dart';
 
 /// The current version of pigeon. This must match the version in pubspec.yaml.
-const String pigeonVersion = '0.2.1';
+const String pigeonVersion = '0.2.2';
 
 /// Read all the content from [stdin] to a String.
 String readStdin() {

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/master/packages/pigeon
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3Apigeon
-version: 0.2.1 # This must match the version in lib/generator_tools.dart
+version: 0.2.2 # This must match the version in lib/generator_tools.dart
 
 environment:
   sdk: '>=2.12.0 <3.0.0'