script/tool/lib/src/create_all_packages_app_command.dart - mirrors/packages - Git at Google

 // Copyright 2013 The Flutter Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 import 'package:file/file.dart';
 import 'package:meta/meta.dart';
 import 'package:path/path.dart' as p;
 import 'package:platform/platform.dart';
 import 'package:pub_semver/pub_semver.dart';
 import 'package:pubspec_parse/pubspec_parse.dart';

 import 'common/core.dart';
 import 'common/file_utils.dart';
 import 'common/output_utils.dart';
 import 'common/package_command.dart';
 import 'common/process_runner.dart';
 import 'common/pub_utils.dart';
 import 'common/repository_package.dart';

 /// The name of the build-all-packages project, as passed to `flutter create`.
 @visibleForTesting
 const String allPackagesProjectName = 'all_packages';

 const int _exitFlutterCreateFailed = 3;
 const int _exitGenNativeBuildFilesFailed = 4;
 const int _exitMissingFile = 5;
 const int _exitMissingLegacySource = 6;

 /// A command to create an application that builds all in a single application.
 class CreateAllPackagesAppCommand extends PackageCommand {
   /// Creates an instance of the builder command.
   CreateAllPackagesAppCommand(
     Directory packagesDir, {
     ProcessRunner processRunner = const ProcessRunner(),
     Platform platform = const LocalPlatform(),
   }) : super(packagesDir, processRunner: processRunner, platform: platform) {
     argParser.addOption(_outputDirectoryFlag,
         defaultsTo: packagesDir.parent.path,
         help: 'The path the directory to create the "$allPackagesProjectName" '
             'project in.\n'
             'Defaults to the repository root.');
     argParser.addOption(_legacySourceFlag,
         help: 'A partial project directory to use as a source for replacing '
             'portions of the created app. All top-level directories in the '
             'source will replace the corresponding directories in the output '
             'directory post-create.\n\n'
             'The replacement will be done before any tool-driven '
             'modifications.');
   }

   static const String _legacySourceFlag = 'legacy-source';
   static const String _outputDirectoryFlag = 'output-dir';

   /// The location to create the synthesized app project.
   Directory get _appDirectory => packagesDir.fileSystem
       .directory(getStringArg(_outputDirectoryFlag))
       .childDirectory(allPackagesProjectName);

   /// The synthesized app project.
   RepositoryPackage get app => RepositoryPackage(_appDirectory);

   @override
   String get description =>
       'Generate Flutter app that includes all target packagas.';

   @override
   String get name => 'create-all-packages-app';

   @override
   Future<void> run() async {
     final int exitCode = await _createApp();
     if (exitCode != 0) {
       printError('Failed to `flutter create`: $exitCode');
       throw ToolExit(_exitFlutterCreateFailed);
     }

     final String? legacySource = getNullableStringArg(_legacySourceFlag);
     if (legacySource != null) {
       final Directory legacyDir =
           packagesDir.fileSystem.directory(legacySource);
       await _replaceWithLegacy(target: _appDirectory, source: legacyDir);
     }

     final Set<String> excluded = getExcludedPackageNames();
     if (excluded.isNotEmpty) {
       print('Exluding the following plugins from the combined build:');
       for (final String plugin in excluded) {
         print('  $plugin');
       }
       print('');
     }

     await _genPubspecWithAllPlugins();

     // Run `flutter pub get` to generate all native build files.
     // TODO(stuartmorgan): This hangs on Windows for some reason. Since it's
     // currently not needed on Windows, skip it there, but we should investigate
     // further and/or implement https://github.com/flutter/flutter/issues/93407,
     // and remove the need for this conditional.
     if (!platform.isWindows) {
       if (!await runPubGet(app, processRunner, platform)) {
         printError(
             "Failed to generate native build files via 'flutter pub get'");
         throw ToolExit(_exitGenNativeBuildFilesFailed);
       }
     }

     await Future.wait(<Future<void>>[
       _updateAppGradle(),
       _updateMacosPbxproj(),
       // This step requires the native file generation triggered by
       // flutter pub get above, so can't currently be run on Windows.
       if (!platform.isWindows) _updateMacosPodfile(),
     ]);
   }

   Future<int> _createApp() async {
     return processRunner.runAndStream(
       flutterCommand,
       <String>[
         'create',
         '--template=app',
         '--project-name=$allPackagesProjectName',
         _appDirectory.path,
       ],
     );
   }

   Future<void> _replaceWithLegacy(
       {required Directory target, required Directory source}) async {
     if (!source.existsSync()) {
       printError('No such legacy source directory: ${source.path}');
       throw ToolExit(_exitMissingLegacySource);
     }
     for (final FileSystemEntity entity in source.listSync()) {
       final String basename = entity.basename;
       print('Replacing $basename with legacy version...');
       if (entity is Directory) {
         target.childDirectory(basename).deleteSync(recursive: true);
       } else {
         target.childFile(basename).deleteSync();
       }
       _copyDirectory(source: source, target: target);
     }
   }

   void _copyDirectory({required Directory target, required Directory source}) {
     target.createSync(recursive: true);
     for (final FileSystemEntity entity in source.listSync(recursive: true)) {
       final List<String> subcomponents =
           p.split(p.relative(entity.path, from: source.path));
       if (entity is Directory) {
         childDirectoryWithSubcomponents(target, subcomponents)
             .createSync(recursive: true);
       } else if (entity is File) {
         final File targetFile =
             childFileWithSubcomponents(target, subcomponents);
         targetFile.parent.createSync(recursive: true);
         entity.copySync(targetFile.path);
       } else {
         throw UnimplementedError('Unsupported entity: $entity');
       }
     }
   }

   /// Rewrites [file], replacing any lines contain a key in [replacements] with
   /// the lines in the corresponding value, and adding any lines in [additions]'
   /// values after lines containing the key.
   void _adjustFile(
     File file, {
     Map<String, List<String>> replacements = const <String, List<String>>{},
     Map<String, List<String>> additions = const <String, List<String>>{},
     Map<RegExp, List<String>> regexReplacements =
         const <RegExp, List<String>>{},
   }) {
     if (replacements.isEmpty && additions.isEmpty) {
       return;
     }
     if (!file.existsSync()) {
       printError('Unable to find ${file.path} for updating.');
       throw ToolExit(_exitMissingFile);
     }

     final StringBuffer output = StringBuffer();
     for (final String line in file.readAsLinesSync()) {
       List<String>? replacementLines;
       for (final MapEntry<String, List<String>> replacement
           in replacements.entries) {
         if (line.contains(replacement.key)) {
           replacementLines = replacement.value;
           break;
         }
       }
       if (replacementLines == null) {
         for (final MapEntry<RegExp, List<String>> replacement
             in regexReplacements.entries) {
           final RegExpMatch? match = replacement.key.firstMatch(line);
           if (match != null) {
             replacementLines = replacement.value;
             break;
           }
         }
       }
       (replacementLines ?? <String>[line]).forEach(output.writeln);

       for (final String targetString in additions.keys) {
         if (line.contains(targetString)) {
           additions[targetString]!.forEach(output.writeln);
         }
       }
     }
     file.writeAsStringSync(output.toString());
   }

   Future<void> _updateAppGradle() async {
     final File gradleFile = app
         .platformDirectory(FlutterPlatform.android)
         .childDirectory('app')
         .childFile('build.gradle');

     // Ensure that there is a dependencies section, so the dependencies addition
     // below will work.
     final String content = gradleFile.readAsStringSync();
     if (!content.contains('\ndependencies {')) {
       gradleFile.writeAsStringSync('''
 $content
 dependencies {}
 ''');
     }

     const String lifecycleDependency =
         "    implementation 'androidx.lifecycle:lifecycle-runtime:2.2.0-rc01'";

     _adjustFile(
       gradleFile,
       replacements: <String, List<String>>{
         // minSdkVersion 21 is required by camera_android.
         'minSdkVersion': <String>['minSdkVersion 21'],
         // compileSdkVersion 33 is required by local_auth.
         'compileSdkVersion': <String>['compileSdkVersion 33'],
       },
       additions: <String, List<String>>{
         'defaultConfig {': <String>['        multiDexEnabled true'],
       },
       regexReplacements: <RegExp, List<String>>{
         // Tests for https://github.com/flutter/flutter/issues/43383
         // Handling of 'dependencies' is more complex since it hasn't been very
         // stable across template versions.
         // - Handle an empty, collapsed dependencies section.
         RegExp(r'^dependencies\s+{\s*}$'): <String>[
           'dependencies {',
           lifecycleDependency,
           '}',
         ],
         // - Handle a normal dependencies section.
         RegExp(r'^dependencies\s+{$'): <String>[
           'dependencies {',
           lifecycleDependency,
         ],
         // - See below for handling of the case where there is no dependencies
         // section.
       },
     );
   }

   Future<void> _genPubspecWithAllPlugins() async {
     // Read the old pubspec file's Dart SDK version, in order to preserve it
     // in the new file. The template sometimes relies on having opted in to
     // specific language features via SDK version, so using a different one
     // can cause compilation failures.
     final Pubspec originalPubspec = app.parsePubspec();
     const String dartSdkKey = 'sdk';
     final VersionConstraint dartSdkConstraint =
         originalPubspec.environment?[dartSdkKey] ??
             VersionConstraint.compatibleWith(
               Version.parse('2.12.0'),
             );

     final Map<String, PathDependency> pluginDeps =
         await _getValidPathDependencies();
     final Pubspec pubspec = Pubspec(
       allPackagesProjectName,
       description: 'Flutter app containing all 1st party plugins.',
       version: Version.parse('1.0.0+1'),
       environment: <String, VersionConstraint>{
         dartSdkKey: dartSdkConstraint,
       },
       dependencies: <String, Dependency>{
         'flutter': SdkDependency('flutter'),
       }..addAll(pluginDeps),
       devDependencies: <String, Dependency>{
         'flutter_test': SdkDependency('flutter'),
       },
       dependencyOverrides: pluginDeps,
     );
     app.pubspecFile.writeAsStringSync(_pubspecToString(pubspec));
   }

   Future<Map<String, PathDependency>> _getValidPathDependencies() async {
     final Map<String, PathDependency> pathDependencies =
         <String, PathDependency>{};

     await for (final PackageEnumerationEntry entry in getTargetPackages()) {
       final RepositoryPackage package = entry.package;
       final Directory pluginDirectory = package.directory;
       final String pluginName = pluginDirectory.basename;
       final Pubspec pubspec = package.parsePubspec();

       if (pubspec.publishTo != 'none') {
         pathDependencies[pluginName] = PathDependency(pluginDirectory.path);
       }
     }
     return pathDependencies;
   }

   String _pubspecToString(Pubspec pubspec) {
     return '''
 ### Generated file. Do not edit. Run `dart pub global run flutter_plugin_tools gen-pubspec` to update.
 name: ${pubspec.name}
 description: ${pubspec.description}
 publish_to: none

 version: ${pubspec.version}

 environment:${_pubspecMapString(pubspec.environment!)}

 dependencies:${_pubspecMapString(pubspec.dependencies)}

 dependency_overrides:${_pubspecMapString(pubspec.dependencyOverrides)}

 dev_dependencies:${_pubspecMapString(pubspec.devDependencies)}
 ###''';
   }

   String _pubspecMapString(Map<String, Object?> values) {
     final StringBuffer buffer = StringBuffer();

     for (final MapEntry<String, Object?> entry in values.entries) {
       buffer.writeln();
       final Object? entryValue = entry.value;
       if (entryValue is VersionConstraint) {
         String value = entryValue.toString();
         // Range constraints require quoting.
         if (value.startsWith('>') || value.startsWith('<')) {
           value = "'$value'";
         }
         buffer.write('  ${entry.key}: $value');
       } else if (entryValue is SdkDependency) {
         buffer.write('  ${entry.key}: \n    sdk: ${entryValue.sdk}');
       } else if (entryValue is PathDependency) {
         String depPath = entryValue.path;
         if (path.style == p.Style.windows) {
           // Posix-style path separators are preferred in pubspec.yaml (and
           // using a consistent format makes unit testing simpler), so convert.
           final List<String> components = path.split(depPath);
           final String firstComponent = components.first;
           // path.split leaves a \ on drive components that isn't necessary,
           // and confuses pub, so remove it.
           if (firstComponent.endsWith(r':\')) {
             components[0] =
                 firstComponent.substring(0, firstComponent.length - 1);
           }
           depPath = p.posix.joinAll(components);
         }
         buffer.write('  ${entry.key}: \n    path: $depPath');
       } else {
         throw UnimplementedError(
           'Not available for type: ${entryValue.runtimeType}',
         );
       }
     }

     return buffer.toString();
   }

   Future<void> _updateMacosPodfile() async {
     /// Only change the macOS deployment target if the host platform is macOS.
     /// The Podfile is not generated on other platforms.
     if (!platform.isMacOS) {
       return;
     }

     final File podfile =
         app.platformDirectory(FlutterPlatform.macos).childFile('Podfile');
     _adjustFile(
       podfile,
       replacements: <String, List<String>>{
         // macOS 10.15 is required by in_app_purchase.
         'platform :osx': <String>["platform :osx, '10.15'"],
       },
     );
   }

   Future<void> _updateMacosPbxproj() async {
     final File pbxprojFile = app
         .platformDirectory(FlutterPlatform.macos)
         .childDirectory('Runner.xcodeproj')
         .childFile('project.pbxproj');
     _adjustFile(
       pbxprojFile,
       replacements: <String, List<String>>{
         // macOS 10.15 is required by in_app_purchase.
         'MACOSX_DEPLOYMENT_TARGET': <String>[
           '				MACOSX_DEPLOYMENT_TARGET = 10.15;'
         ],
       },
     );
   }
 }
	// Copyright 2013 The Flutter Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	import 'package:file/file.dart';
	import 'package:meta/meta.dart';
	import 'package:path/path.dart' as p;
	import 'package:platform/platform.dart';
	import 'package:pub_semver/pub_semver.dart';
	import 'package:pubspec_parse/pubspec_parse.dart';

	import 'common/core.dart';
	import 'common/file_utils.dart';
	import 'common/output_utils.dart';
	import 'common/package_command.dart';
	import 'common/process_runner.dart';
	import 'common/pub_utils.dart';
	import 'common/repository_package.dart';

	/// The name of the build-all-packages project, as passed to `flutter create`.
	@visibleForTesting
	const String allPackagesProjectName = 'all_packages';

	const int _exitFlutterCreateFailed = 3;
	const int _exitGenNativeBuildFilesFailed = 4;
	const int _exitMissingFile = 5;
	const int _exitMissingLegacySource = 6;

	/// A command to create an application that builds all in a single application.
	class CreateAllPackagesAppCommand extends PackageCommand {
	/// Creates an instance of the builder command.
	CreateAllPackagesAppCommand(
	Directory packagesDir, {
	ProcessRunner processRunner = const ProcessRunner(),
	Platform platform = const LocalPlatform(),
	}) : super(packagesDir, processRunner: processRunner, platform: platform) {
	argParser.addOption(_outputDirectoryFlag,
	defaultsTo: packagesDir.parent.path,
	help: 'The path the directory to create the "$allPackagesProjectName" '
	'project in.\n'
	'Defaults to the repository root.');
	argParser.addOption(_legacySourceFlag,
	help: 'A partial project directory to use as a source for replacing '
	'portions of the created app. All top-level directories in the '
	'source will replace the corresponding directories in the output '
	'directory post-create.\n\n'
	'The replacement will be done before any tool-driven '
	'modifications.');
	}

	static const String _legacySourceFlag = 'legacy-source';
	static const String _outputDirectoryFlag = 'output-dir';

	/// The location to create the synthesized app project.
	Directory get _appDirectory => packagesDir.fileSystem
	.directory(getStringArg(_outputDirectoryFlag))
	.childDirectory(allPackagesProjectName);

	/// The synthesized app project.
	RepositoryPackage get app => RepositoryPackage(_appDirectory);

	@override
	String get description =>
	'Generate Flutter app that includes all target packagas.';

	@override
	String get name => 'create-all-packages-app';

	@override
	Future<void> run() async {
	final int exitCode = await _createApp();
	if (exitCode != 0) {
	printError('Failed to `flutter create`: $exitCode');
	throw ToolExit(_exitFlutterCreateFailed);
	}

	final String? legacySource = getNullableStringArg(_legacySourceFlag);
	if (legacySource != null) {
	final Directory legacyDir =
	packagesDir.fileSystem.directory(legacySource);
	await _replaceWithLegacy(target: _appDirectory, source: legacyDir);
	}

	final Set<String> excluded = getExcludedPackageNames();
	if (excluded.isNotEmpty) {
	print('Exluding the following plugins from the combined build:');
	for (final String plugin in excluded) {
	print(' $plugin');
	}
	print('');
	}

	await _genPubspecWithAllPlugins();

	// Run `flutter pub get` to generate all native build files.
	// TODO(stuartmorgan): This hangs on Windows for some reason. Since it's
	// currently not needed on Windows, skip it there, but we should investigate
	// further and/or implement https://github.com/flutter/flutter/issues/93407,
	// and remove the need for this conditional.
	if (!platform.isWindows) {
	if (!await runPubGet(app, processRunner, platform)) {
	printError(
	"Failed to generate native build files via 'flutter pub get'");
	throw ToolExit(_exitGenNativeBuildFilesFailed);
	}
	}

	await Future.wait(<Future<void>>[
	_updateAppGradle(),
	_updateMacosPbxproj(),
	// This step requires the native file generation triggered by
	// flutter pub get above, so can't currently be run on Windows.
	if (!platform.isWindows) _updateMacosPodfile(),
	]);
	}

	Future<int> _createApp() async {
	return processRunner.runAndStream(
	flutterCommand,
	<String>[
	'create',
	'--template=app',
	'--project-name=$allPackagesProjectName',
	_appDirectory.path,
	],
	);
	}

	Future<void> _replaceWithLegacy(
	{required Directory target, required Directory source}) async {
	if (!source.existsSync()) {
	printError('No such legacy source directory: ${source.path}');
	throw ToolExit(_exitMissingLegacySource);
	}
	for (final FileSystemEntity entity in source.listSync()) {
	final String basename = entity.basename;
	print('Replacing $basename with legacy version...');
	if (entity is Directory) {
	target.childDirectory(basename).deleteSync(recursive: true);
	} else {
	target.childFile(basename).deleteSync();
	}
	_copyDirectory(source: source, target: target);
	}
	}

	void _copyDirectory({required Directory target, required Directory source}) {
	target.createSync(recursive: true);
	for (final FileSystemEntity entity in source.listSync(recursive: true)) {
	final List<String> subcomponents =
	p.split(p.relative(entity.path, from: source.path));
	if (entity is Directory) {
	childDirectoryWithSubcomponents(target, subcomponents)
	.createSync(recursive: true);
	} else if (entity is File) {
	final File targetFile =
	childFileWithSubcomponents(target, subcomponents);
	targetFile.parent.createSync(recursive: true);
	entity.copySync(targetFile.path);
	} else {
	throw UnimplementedError('Unsupported entity: $entity');
	}
	}
	}

	/// Rewrites [file], replacing any lines contain a key in [replacements] with
	/// the lines in the corresponding value, and adding any lines in [additions]'
	/// values after lines containing the key.
	void _adjustFile(
	File file, {
	Map<String, List<String>> replacements = const <String, List<String>>{},
	Map<String, List<String>> additions = const <String, List<String>>{},
	Map<RegExp, List<String>> regexReplacements =
	const <RegExp, List<String>>{},
	}) {
	if (replacements.isEmpty && additions.isEmpty) {
	return;
	}
	if (!file.existsSync()) {
	printError('Unable to find ${file.path} for updating.');
	throw ToolExit(_exitMissingFile);
	}

	final StringBuffer output = StringBuffer();
	for (final String line in file.readAsLinesSync()) {
	List<String>? replacementLines;
	for (final MapEntry<String, List<String>> replacement
	in replacements.entries) {
	if (line.contains(replacement.key)) {
	replacementLines = replacement.value;
	break;
	}
	}
	if (replacementLines == null) {
	for (final MapEntry<RegExp, List<String>> replacement
	in regexReplacements.entries) {
	final RegExpMatch? match = replacement.key.firstMatch(line);
	if (match != null) {
	replacementLines = replacement.value;
	break;
	}
	}
	}
	(replacementLines ?? <String>[line]).forEach(output.writeln);

	for (final String targetString in additions.keys) {
	if (line.contains(targetString)) {
	additions[targetString]!.forEach(output.writeln);
	}
	}
	}
	file.writeAsStringSync(output.toString());
	}

	Future<void> _updateAppGradle() async {
	final File gradleFile = app
	.platformDirectory(FlutterPlatform.android)
	.childDirectory('app')
	.childFile('build.gradle');

	// Ensure that there is a dependencies section, so the dependencies addition
	// below will work.
	final String content = gradleFile.readAsStringSync();
	if (!content.contains('\ndependencies {')) {
	gradleFile.writeAsStringSync('''
	$content
	dependencies {}
	''');
	}

	const String lifecycleDependency =
	" implementation 'androidx.lifecycle:lifecycle-runtime:2.2.0-rc01'";

	_adjustFile(
	gradleFile,
	replacements: <String, List<String>>{
	// minSdkVersion 21 is required by camera_android.
	'minSdkVersion': <String>['minSdkVersion 21'],
	// compileSdkVersion 33 is required by local_auth.
	'compileSdkVersion': <String>['compileSdkVersion 33'],
	},
	additions: <String, List<String>>{
	'defaultConfig {': <String>[' multiDexEnabled true'],
	},
	regexReplacements: <RegExp, List<String>>{
	// Tests for https://github.com/flutter/flutter/issues/43383
	// Handling of 'dependencies' is more complex since it hasn't been very
	// stable across template versions.
	// - Handle an empty, collapsed dependencies section.
	RegExp(r'^dependencies\s+{\s*}$'): <String>[
	'dependencies {',
	lifecycleDependency,
	'}',
	],
	// - Handle a normal dependencies section.
	RegExp(r'^dependencies\s+{$'): <String>[
	'dependencies {',
	lifecycleDependency,
	],
	// - See below for handling of the case where there is no dependencies
	// section.
	},
	);
	}

	Future<void> _genPubspecWithAllPlugins() async {
	// Read the old pubspec file's Dart SDK version, in order to preserve it
	// in the new file. The template sometimes relies on having opted in to
	// specific language features via SDK version, so using a different one
	// can cause compilation failures.
	final Pubspec originalPubspec = app.parsePubspec();
	const String dartSdkKey = 'sdk';
	final VersionConstraint dartSdkConstraint =
	originalPubspec.environment?[dartSdkKey] ??
	VersionConstraint.compatibleWith(
	Version.parse('2.12.0'),
	);

	final Map<String, PathDependency> pluginDeps =
	await _getValidPathDependencies();
	final Pubspec pubspec = Pubspec(
	allPackagesProjectName,
	description: 'Flutter app containing all 1st party plugins.',
	version: Version.parse('1.0.0+1'),
	environment: <String, VersionConstraint>{
	dartSdkKey: dartSdkConstraint,
	},
	dependencies: <String, Dependency>{
	'flutter': SdkDependency('flutter'),
	}..addAll(pluginDeps),
	devDependencies: <String, Dependency>{
	'flutter_test': SdkDependency('flutter'),
	},
	dependencyOverrides: pluginDeps,
	);
	app.pubspecFile.writeAsStringSync(_pubspecToString(pubspec));
	}

	Future<Map<String, PathDependency>> _getValidPathDependencies() async {
	final Map<String, PathDependency> pathDependencies =
	<String, PathDependency>{};

	await for (final PackageEnumerationEntry entry in getTargetPackages()) {
	final RepositoryPackage package = entry.package;
	final Directory pluginDirectory = package.directory;
	final String pluginName = pluginDirectory.basename;
	final Pubspec pubspec = package.parsePubspec();

	if (pubspec.publishTo != 'none') {
	pathDependencies[pluginName] = PathDependency(pluginDirectory.path);
	}
	}
	return pathDependencies;
	}

	String _pubspecToString(Pubspec pubspec) {
	return '''
	### Generated file. Do not edit. Run `dart pub global run flutter_plugin_tools gen-pubspec` to update.
	name: ${pubspec.name}
	description: ${pubspec.description}
	publish_to: none

	version: ${pubspec.version}

	environment:${_pubspecMapString(pubspec.environment!)}

	dependencies:${_pubspecMapString(pubspec.dependencies)}

	dependency_overrides:${_pubspecMapString(pubspec.dependencyOverrides)}

	dev_dependencies:${_pubspecMapString(pubspec.devDependencies)}
	###''';
	}

	String _pubspecMapString(Map<String, Object?> values) {
	final StringBuffer buffer = StringBuffer();

	for (final MapEntry<String, Object?> entry in values.entries) {
	buffer.writeln();
	final Object? entryValue = entry.value;
	if (entryValue is VersionConstraint) {
	String value = entryValue.toString();
	// Range constraints require quoting.
	if (value.startsWith('>') \|\| value.startsWith('<')) {
	value = "'$value'";
	}
	buffer.write(' ${entry.key}: $value');
	} else if (entryValue is SdkDependency) {
	buffer.write(' ${entry.key}: \n sdk: ${entryValue.sdk}');
	} else if (entryValue is PathDependency) {
	String depPath = entryValue.path;
	if (path.style == p.Style.windows) {
	// Posix-style path separators are preferred in pubspec.yaml (and
	// using a consistent format makes unit testing simpler), so convert.
	final List<String> components = path.split(depPath);
	final String firstComponent = components.first;
	// path.split leaves a \ on drive components that isn't necessary,
	// and confuses pub, so remove it.
	if (firstComponent.endsWith(r':\')) {
	components[0] =
	firstComponent.substring(0, firstComponent.length - 1);
	}
	depPath = p.posix.joinAll(components);
	}
	buffer.write(' ${entry.key}: \n path: $depPath');
	} else {
	throw UnimplementedError(
	'Not available for type: ${entryValue.runtimeType}',
	);
	}
	}

	return buffer.toString();
	}

	Future<void> _updateMacosPodfile() async {
	/// Only change the macOS deployment target if the host platform is macOS.
	/// The Podfile is not generated on other platforms.
	if (!platform.isMacOS) {
	return;
	}

	final File podfile =
	app.platformDirectory(FlutterPlatform.macos).childFile('Podfile');
	_adjustFile(
	podfile,
	replacements: <String, List<String>>{
	// macOS 10.15 is required by in_app_purchase.
	'platform :osx': <String>["platform :osx, '10.15'"],
	},
	);
	}

	Future<void> _updateMacosPbxproj() async {
	final File pbxprojFile = app
	.platformDirectory(FlutterPlatform.macos)
	.childDirectory('Runner.xcodeproj')
	.childFile('project.pbxproj');
	_adjustFile(
	pbxprojFile,
	replacements: <String, List<String>>{
	// macOS 10.15 is required by in_app_purchase.
	'MACOSX_DEPLOYMENT_TARGET': <String>[
	' MACOSX_DEPLOYMENT_TARGET = 10.15;'
	],
	},
	);
	}
	}