[in_app_purchase] Add support for macOS (flutter#6519)

* Updated version and changelog.

* Updated readme to mention MacOS as a supported platform.

* Minor fixup.

* Fixed capitalization in readme.

* Added macos to example.

* Updated MacOS example.

* Unified macOS capitalization.

* Removed generated app icons.

* Updated version and deployment target.

* Updated version to a minor version change.

Was previously only a patch.

packages/in_app_purchase/in_app_purchase/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 3.1.0
+
+* Adds macOS as a supported platform.
+
 ## 3.0.8
 
 * Updates minimum Flutter version to 2.10.

packages/in_app_purchase/in_app_purchase/README.md

@@ -3,11 +3,11 @@ A storefront-independent API for purchases in Flutter apps.
 <!-- If this package were in its own repo, we'd put badges here -->
 
 This plugin supports in-app purchases (_IAP_) through an _underlying store_,
-which can be the App Store (on iOS) or Google Play (on Android).
+which can be the App Store (on iOS and macOS) or Google Play (on Android).
 
-|             | Android | iOS  |
-|-------------|---------|------|
-| **Support** | SDK 16+ | 9.0+ |
+|             | Android | iOS  | macOS  |
+|-------------|---------|------|--------|
+| **Support** | SDK 16+ | 9.0+ | 10.15+ |
 
 <p>
   <img src="https://github.com/flutter/plugins/blob/main/packages/in_app_purchase/in_app_purchase/doc/iap_ios.gif?raw=true"

packages/in_app_purchase/in_app_purchase/example/macos/Flutter/Flutter-Debug.xcconfig

@@ -0,0 +1,2 @@
+#include? "Pods/Target Support Files/Pods-Runner/Pods-Runner.debug.xcconfig"
+#include "ephemeral/Flutter-Generated.xcconfig"

packages/in_app_purchase/in_app_purchase/example/macos/Flutter/Flutter-Release.xcconfig

@@ -0,0 +1,2 @@
+#include? "Pods/Target Support Files/Pods-Runner/Pods-Runner.release.xcconfig"
+#include "ephemeral/Flutter-Generated.xcconfig"

packages/in_app_purchase/in_app_purchase/example/macos/Podfile

@@ -0,0 +1,40 @@
+platform :osx, '10.15'
+
+# CocoaPods analytics sends network stats synchronously affecting flutter build latency.
+ENV['COCOAPODS_DISABLE_STATS'] = 'true'
+
+project 'Runner', {
+  'Debug' => :debug,
+  'Profile' => :release,
+  'Release' => :release,
+}
+
+def flutter_root
+  generated_xcode_build_settings_path = File.expand_path(File.join('..', 'Flutter', 'ephemeral', 'Flutter-Generated.xcconfig'), __FILE__)
+  unless File.exist?(generated_xcode_build_settings_path)
+    raise "#{generated_xcode_build_settings_path} must exist. If you're running pod install manually, make sure \"flutter pub get\" is executed first"
+  end
+
+  File.foreach(generated_xcode_build_settings_path) do |line|
+    matches = line.match(/FLUTTER_ROOT\=(.*)/)
+    return matches[1].strip if matches
+  end
+  raise "FLUTTER_ROOT not found in #{generated_xcode_build_settings_path}. Try deleting Flutter-Generated.xcconfig, then run \"flutter pub get\""
+end
+
+require File.expand_path(File.join('packages', 'flutter_tools', 'bin', 'podhelper'), flutter_root)
+
+flutter_macos_podfile_setup
+
+target 'Runner' do
+  use_frameworks!
+  use_modular_headers!
+
+  flutter_install_all_macos_pods File.dirname(File.realpath(__FILE__))
+end
+
+post_install do |installer|
+  installer.pods_project.targets.each do |target|
+    flutter_additional_macos_build_settings(target)
+  end
+end