new tweak: drop lint

pkgs/blast_repo/lib/src/top_level.dart

@@ -11,6 +11,7 @@ import 'package:git/git.dart';
 import 'repo_tweak.dart';
 import 'tweaks/auto_publish_tweak.dart';
 import 'tweaks/dependabot_tweak.dart';
+import 'tweaks/drop_lint_tweak.dart';
 import 'tweaks/github_action_tweak.dart';
 import 'tweaks/mono_repo_tweak.dart';
 import 'tweaks/no_reponse_tweak.dart';
@@ -19,6 +20,7 @@ import 'utils.dart';
 final allTweaks = Set<RepoTweak>.unmodifiable([
   AutoPublishTweak(),
   DependabotTweak(),
+  DropLintTweak(),
   GitHubActionTweak(),
   MonoRepoTweak(),
   NoResponseTweak(),

pkgs/blast_repo/lib/src/tweaks/drop_lint_tweak.dart

@@ -0,0 +1,88 @@
+// Copyright (c) 2022, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'dart:async';
+import 'dart:io';
+
+import 'package:collection/collection.dart';
+import 'package:path/path.dart' as p;
+import 'package:yaml/yaml.dart';
+import 'package:yaml_edit/yaml_edit.dart';
+
+import '../repo_tweak.dart';
+
+final _instance = DropLintTweak._();
+
+class DropLintTweak extends RepoTweak {
+  factory DropLintTweak() => _instance;
+
+  DropLintTweak._()
+      : super(
+          id: 'drop-lint',
+          description: 'Drop deprecated lints from analysis_options.yaml',
+        );
+
+  @override
+  bool shouldRunByDefault(Directory checkout, String repoSlug) => true;
+
+  @override
+  FutureOr<FixResult> fix(Directory checkout, String repoSlug) async {
+    final analysisOptionsFile =
+        File(p.join(checkout.path, 'analysis_options.yaml'));
+
+    if (!analysisOptionsFile.existsSync()) {
+      return FixResult.noFixesMade;
+    }
+
+    final yamlSource = loadYaml(
+      analysisOptionsFile.readAsStringSync(),
+      sourceUrl: analysisOptionsFile.uri,
+    );
+
+    if (yamlSource is YamlMap) {
+      final linterNode = yamlSource['linter'];
+      if (linterNode is YamlMap) {
+        final rules = linterNode['rules'];
+
+        if (rules is YamlList) {
+          final fixes = <String>{};
+          final badIndexes = rules
+              .mapIndexed((index, value) {
+                if (_deprecatedLints.contains(value)) {
+                  fixes.add('Removed "$value".');
+                  return index;
+                }
+                return -1;
+              })
+              .where((e) => e >= 0)
+              .toList();
+
+          final editor = YamlEditor(analysisOptionsFile.readAsStringSync());
+          for (var index in badIndexes.reversed) {
+            editor.remove(['linter', 'rules', index]);
+          }
+
+          analysisOptionsFile.writeAsStringSync(editor.toString(),
+              mode: FileMode.writeOnly);
+
+          return FixResult(fixes: fixes.toList()..sort());
+        }
+
+        if (rules == null) {
+          return FixResult(fixes: []);
+        }
+
+        throw UnimplementedError('not sure what to do with $rules');
+      }
+    }
+
+    return FixResult(fixes: []);
+  }
+}
+
+final _deprecatedLints = {
+  'avoid_null_checks_in_equality_operators',
+  'package_api_docs',
+  'unsafe_html',
+};

pkgs/blast_repo/test/drop_lint_test.dart

@@ -0,0 +1,130 @@
+// Copyright (c) 2024, the Dart project authors.  Please see the AUTHORS file
+// for details. 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:blast_repo/src/tweaks/drop_lint_tweak.dart';
+import 'package:test/test.dart';
+import 'package:test_descriptor/test_descriptor.dart' as d;
+
+void main() {
+  late DropLintTweak tweak;
+
+  setUp(() async {
+    tweak = DropLintTweak();
+  });
+
+  test('removes the dead items', () async {
+    await d.dir('foo', [
+      d.file('analysis_options.yaml', r'''
+analyzer:
+  language:
+    strict-inference: true
+    strict-raw-types: true
+
+linter:
+  rules:
+    - avoid_classes_with_only_static_members
+    - avoid_null_checks_in_equality_operators
+    - no_runtimeType_toString
+    - package_api_docs
+    - prefer_const_declarations
+    - unsafe_html
+    - use_if_null_to_convert_nulls_to_bools
+''')
+    ]).create();
+    final dir = d.dir('foo').io;
+
+    var results = await tweak.fix(dir, 'my_org/my_repo');
+    expect(results.fixes, hasLength(3));
+
+    await d.dir('foo', [
+      d.file('analysis_options.yaml', r'''
+analyzer:
+  language:
+    strict-inference: true
+    strict-raw-types: true
+
+linter:
+  rules:
+    - avoid_classes_with_only_static_members
+    - no_runtimeType_toString
+    - prefer_const_declarations
+    - use_if_null_to_convert_nulls_to_bools
+''')
+    ]).validate();
+  });
+
+  test('handles no linter section', () async {
+    await d.dir('foo', [
+      d.file('analysis_options.yaml', r'''
+analyzer:
+  language:
+    strict-inference: true
+    strict-raw-types: true
+''')
+    ]).create();
+    final dir = d.dir('foo').io;
+
+    var results = await tweak.fix(dir, 'my_org/my_repo');
+    expect(results.fixes, isEmpty);
+
+    await d.dir('foo', [
+      d.file('analysis_options.yaml', r'''
+analyzer:
+  language:
+    strict-inference: true
+    strict-raw-types: true
+''')
+    ]).validate();
+  });
+
+  test('handles no analysis options file', () async {
+    await d.dir('foo', []).create();
+    final dir = d.dir('foo').io;
+
+    var results = await tweak.fix(dir, 'my_org/my_repo');
+    expect(results.fixes, isEmpty);
+  });
+
+  test('handles no bad lints', () async {
+    await d.dir('foo', [
+      d.file('analysis_options.yaml', r'''
+analyzer:
+  language:
+    strict-inference: true
+    strict-raw-types: true
+
+linter:
+  rules:
+    - avoid_classes_with_only_static_members
+    - no_runtimeType_toString
+    - prefer_const_declarations
+    - use_if_null_to_convert_nulls_to_bools
+''')
+    ]).create();
+    final dir = d.dir('foo').io;
+
+    var results = await tweak.fix(dir, 'my_org/my_repo');
+    expect(results.fixes, isEmpty);
+
+    await d.dir('foo', [
+      d.file('analysis_options.yaml', r'''
+analyzer:
+  language:
+    strict-inference: true
+    strict-raw-types: true
+
+linter:
+  rules:
+    - avoid_classes_with_only_static_members
+    - no_runtimeType_toString
+    - prefer_const_declarations
+    - use_if_null_to_convert_nulls_to_bools
+''')
+    ]).validate();
+  });
+
+  test('handles rules as map', skip: 'not implemented yet!', () async {
+    print('TODO!');
+  });
+}