Document how to use pigeon and update to the latest version.

This mainly splits out the test logic from the messages.dart file.

Author: Hixie

packages/video_player/video_player/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 2.0.0-nullsafety.10
+
+* Updated to video_player_platform_interface 4.0.
+
 ## 2.0.0-nullsafety.9
 
 * Fixed an issue where a crash can occur after a closing a video player view on iOS.

packages/video_player/video_player/CONTRIBUTING.md

@@ -0,0 +1,82 @@
+## Updating pigeon-generated files
+
+If you update files in the pigeons/ directory, run the following
+command in this directory (ignore the errors you get about
+dependencies in the examples directory):
+
+```bash
+flutter pub upgrade
+flutter pub run pigeon --dart_null_safety --input pigeons/messages.dart
+# git commit your changes so that your working environment is clean
+(cd ../../../; ./script/incremental_build.sh format --travis --clang-format=clang-format-7)
+```
+
+If you update pigeon itself and want to test the changes here,
+temporarily update the pubspec.yaml by adding the following to the
+`dependency_overrides` section, assuming you have checked out the
+`flutter/packages` repo in a sibling directory to the `plugins` repo:
+
+```yaml
+  pigeon:
+    path:
+      ../../../../packages/packages/pigeon/
+```
+
+Then, run the commands above. When you run `pub get` it should warn
+you that you're using an override. If you do this, you will need to
+publish pigeon before you can land the updates to this package, since
+the CI tests run the analysis using latest published version of
+pigeon, not your version or the version on master.
+
+In either case, the configuration will be obtained automatically from
+the `pigeons/messages.dart` file (see `configurePigeon` at the bottom
+of that file).
+
+While contributing, you may also want to set the following dependency
+overrides:
+
+```yaml
+dependency_overrides:
+  video_player_platform_interface:
+    path:
+      ../video_player_platform_interface
+  video_player_web:
+    path:
+      ../video_player_web
+```
+
+## Publishing plugin updates that span multiple plugin packages
+
+If your change affects both the interface package and the
+implementation packages, then you will need to publish a version of
+the plugin in between landing the interface changes and the
+implementation changes, since the implementations depend on the
+interface via pub.
+
+To do this, follow these steps:
+
+1. Create a PR that has all the changes, and update the
+`pubspec.yaml`s to have path-based dependency overrides as described
+in the "Updating pigeon-generated files" section above.
+
+2. Upload that PR and get it reviewed and into a state where the only
+test failure is the one complaining that you can't publish a package
+that has dependency overrides.
+
+3. Create a PR that's a subset of the one in the previous step that
+only includes the interface changes, with no dependency overrides, and
+submit that.
+
+4. Once you have had that reviewed and landed, publish the interface
+parts of the plugin to pub.
+
+5. Now, update the original full PR to not use dependency overrides
+but to instead refer to the new version of the plugin, and sync it to
+master (so that the interface changes are gone from the PR). Submit
+that PR.
+
+6. Once you have had _that_ PR reviewed and landed, publish the
+implementation parts of the plugin to pub.
+
+You may need to publish each implementation package independently of
+the main package also, depending on exactly what your change entails.

packages/video_player/video_player/android/src/main/java/io/flutter/plugins/videoplayer/Messages.java

@@ -1,4 +1,4 @@
-// Autogenerated from Pigeon (v0.1.12), do not edit directly.
+// Autogenerated from Pigeon (v0.1.19), do not edit directly.
 // See also: https://pub.dev/packages/pigeon
 
 package io.flutter.plugins.videoplayer;

packages/video_player/video_player/ios/Classes/messages.h

@@ -1,4 +1,4 @@
-// Autogenerated from Pigeon (v0.1.12), do not edit directly.
+// Autogenerated from Pigeon (v0.1.19), do not edit directly.
 // See also: https://pub.dev/packages/pigeon
 #import <Foundation/Foundation.h>
 @protocol FlutterBinaryMessenger;

packages/video_player/video_player/ios/Classes/messages.m

@@ -1,4 +1,4 @@
-// Autogenerated from Pigeon (v0.1.12), do not edit directly.
+// Autogenerated from Pigeon (v0.1.19), do not edit directly.
 // See also: https://pub.dev/packages/pigeon
 #import "messages.h"
 #import <Flutter/Flutter.h>

packages/video_player/video_player/pigeons/messages.dart

@@ -54,6 +54,7 @@ abstract class VideoPlayerApi {
 
 void configurePigeon(PigeonOptions opts) {
   opts.dartOut = '../video_player_platform_interface/lib/messages.dart';
+  opts.dartTestOut = '../video_player_platform_interface/lib/test.dart';
   opts.objcHeaderOut = 'ios/Classes/messages.h';
   opts.objcSourceOut = 'ios/Classes/messages.m';
   opts.objcOptions.prefix = 'FLT';

packages/video_player/video_player/pubspec.yaml

@@ -1,7 +1,7 @@
 name: video_player
 description: Flutter plugin for displaying inline video with other Flutter
   widgets on Android, iOS, and web.
-version: 2.0.0-nullsafety.9
+version: 2.0.0-nullsafety.10
 homepage: https://github.com/flutter/plugins/tree/master/packages/video_player/video_player
 
 flutter:
@@ -17,23 +17,24 @@ flutter:
 
 dependencies:
   meta: ^1.3.0-nullsafety.3
-  video_player_platform_interface: ^3.0.0-nullsafety.3
+  video_player_platform_interface: ^4.0.0-nullsafety.0
 
   # The design on https://flutter.dev/go/federated-plugins was to leave
   # this constraint as "any". We cannot do it right now as it fails pub publish
-  # validation, so we set a ^ constraint.
-  # TODO(amirh): Revisit this (either update this part in the  design or the pub tool).
+  # validation, so we set a ^ constraint. The exact value doesn't matter since
+  # the constraints on the interface pins it.
+  # TODO(amirh): Revisit this (either update this part in the design or the pub tool).
   # https://github.com/flutter/flutter/issues/46264
   video_player_web: ^2.0.0-nullsafety.1
 
   flutter:
     sdk: flutter
-
-dev_dependencies:
   flutter_test:
     sdk: flutter
+
+dev_dependencies:
   pedantic: ^1.10.0-nullsafety.1
-  pigeon: 0.1.7
+  pigeon: ^0.1.19
 
 environment:
   sdk: ">=2.12.0-0 <3.0.0"

packages/video_player/video_player/test/video_player_test.dart

@@ -12,6 +12,7 @@ import 'package:flutter/widgets.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:video_player/video_player.dart';
 import 'package:video_player_platform_interface/messages.dart';
+import 'package:video_player_platform_interface/test.dart';
 import 'package:video_player_platform_interface/video_player_platform_interface.dart';
 
 class FakeController extends ValueNotifier<VideoPlayerValue>

script/incremental_build.sh

@@ -12,7 +12,7 @@ ALL_EXCLUDED=("")
 # Exclude nnbd plugins from stable.
 if [ "$CHANNEL" == "stable" ]; then
   ALL_EXCLUDED=($EXCLUDED_PLUGINS_FROM_STABLE)
-  echo "Excluding the following plugins: $ALL_EXCLUDED"
+  echo "Excluding the following plugins because stable does not yet support NNBD: $ALL_EXCLUDED"
 fi
 
 # Plugins that deliberately use their own analysis_options.yaml.