feat: add wrap with observer assist

.github/workflows/build.yml

@@ -68,3 +68,49 @@ jobs:
           token: ${{ secrets.CODECOV_TOKEN }}
           flags: ${{ matrix.package }}
           files: ./${{ matrix.package }}/coverage/lcov.txt
+
+  build_lint_packages:
+    runs-on: ubuntu-latest
+
+    defaults:
+      run:
+        working-directory: ${{ matrix.package }}
+
+    strategy:
+      matrix:
+        package: ["mobx_lint", "mobx_lint_flutter_test"]
+        version: ["stable"]
+
+    steps:
+      - uses: actions/checkout@v3
+      - uses: subosito/flutter-action@v2
+        with:
+          channel: ${{ matrix.channel }}
+      - name: Add pub cache bin to PATH
+        run: echo "$HOME/.pub-cache/bin" >> $GITHUB_PATH
+      - name: Add pub cache to PATH
+        run: echo "PUB_CACHE="$HOME/.pub-cache"" >> $GITHUB_ENV
+      - name: Install dependencies
+        run: flutter pub get
+      - run: dart pub global activate custom_lint
+
+      - name: Analyze
+        run: flutter analyze
+
+      - name: Run custom_lint
+        run: custom_lint
+        # Workaround to https://github.com/invertase/dart_custom_lint/issues/77
+        if: matrix.package == 'mobx_lint_flutter_test'
+
+      - name: Run tests
+        if: matrix.package == 'mobx_lint_flutter_test'
+        # Workaround to https://github.com/dart-lang/sdk/issues/53530
+        run: ../tool/coverage.sh
+
+      - name: Upload coverage to codecov
+        uses: codecov/codecov-action@v3
+        if: matrix.package == 'mobx_lint_flutter_test'
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          flags: mobx_lint
+          files: coverage/lcov.txt

.github/workflows/publish.yml

@@ -11,7 +11,7 @@ jobs:
 
     strategy:
       matrix:
-        package: [ "mobx", "mobx_codegen" ]
+        package: [ "mobx", "mobx_codegen", "mobx_lint" ]
 
     steps:
       - uses: actions/checkout@v3

codecov.yml

@@ -9,6 +9,8 @@ coverage:
         flags: mobx_codegen
       flutter_mobx:
         flags: flutter_mobx
+      mobx_lint:
+        flags: mobx_lint
 
 flags:
   # filter the folder(s) you wish to measure by that flag
@@ -22,3 +24,6 @@ flags:
   flutter_mobx:
     paths:
       - flutter_mobx/lib/
+  mobx_lint:
+    paths:
+      - mobx_lint/lib/

mobx_lint/CHANGELOG.md

@@ -0,0 +1,3 @@
+## 1.0.0
+
+- add wrap with observer assist by [@amondnet](https://github.com/amondnet)

mobx_lint/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2018 MobX
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

mobx_lint/README.md

@@ -0,0 +1,52 @@
+mobx_lint is a developer tool for users of mobx, designed to help stop common issues and simplify repetitive tasks.
+
+mobx_lint adds various warnings with quick fixes and refactoring options, such as:
+
+- Refactor wrap a widget with Observer
+
+## Installing mobx_lint
+
+mobx_lint is implemented using [custom_lint]. As such, it uses custom_lint's installation logic.  
+Long story short:
+
+- Add both mobx_lint and custom_lint to your `pubspec.yaml`:
+  ```yaml
+  dev_dependencies:
+    custom_lint:
+    mobx_lint:
+  ```
+- Enable `custom_lint`'s plugin in your `analysis_options.yaml`:
+
+  ```yaml
+  analyzer:
+    plugins:
+      - custom_lint
+  ```
+
+## Running mobx_lint in the terminal/CI
+
+Custom lint rules created by mobx_lint may not show-up in `dart analyze`.
+To fix this, you can run a custom command line: `custom_lint`.
+
+Since your project should already have custom_lint installed
+(cf [installing mobx_lint](#installing-mobx_lint)), then you should be
+able to run:
+
+```sh
+dart run custom_lint
+```
+
+Alternatively, you can globally install `custom_lint`:
+
+```sh
+# Install custom_lint for all projects
+dart pub global activate custom_lint
+# run custom_lint's command line in a project
+custom_lint
+```
+
+## All assists
+
+### Wrap widgets with a `Observer`
+
+![Wrap with Consumer sample](resources/wrap_with_observer.gif)

mobx_lint/analysis_options.yaml

@@ -0,0 +1,30 @@
+# This file configures the static analysis results for your project (errors,
+# warnings, and lints).
+#
+# This enables the 'recommended' set of lints from `package:lints`.
+# This set helps identify many issues that may lead to problems when running
+# or consuming Dart code, and enforces writing Dart using a single, idiomatic
+# style and format.
+#
+# If you want a smaller set of lints you can change this to specify
+# 'package:lints/core.yaml'. These are just the most critical lints
+# (the recommended set includes the core lints).
+# The core lints are also what is used by pub.dev for scoring packages.
+
+include: package:lints/recommended.yaml
+
+# Uncomment the following section to specify additional rules.
+
+# linter:
+#   rules:
+#     - camel_case_types
+
+# analyzer:
+#   exclude:
+#     - path/to/excluded/files/**
+
+# For more information about the core and recommended set of lints, see
+# https://dart.dev/go/core-lints
+
+# For additional information about configuring this file, see
+# https://dart.dev/guides/language/analysis-options

mobx_lint/lib/mobx_lint.dart

@@ -0,0 +1,17 @@
+library mobx_lint;
+
+import 'package:custom_lint_builder/custom_lint_builder.dart';
+
+import 'src/assists/wrap_with_observer.dart';
+
+PluginBase createPlugin() => _MobxPlugin();
+
+class _MobxPlugin extends PluginBase {
+  @override
+  List<LintRule> getLintRules(CustomLintConfigs configs) => [];
+
+  @override
+  List<Assist> getAssists() => [
+        WrapWithObserver(),
+      ];
+}

mobx_lint/lib/src/assists/wrap_with_observer.dart

@@ -0,0 +1,45 @@
+import 'package:analyzer/source/source_range.dart';
+import 'package:custom_lint_builder/custom_lint_builder.dart';
+import 'package:mobx_lint/src/mobx_custom_lint.dart';
+
+import '../mobx_types.dart';
+
+/// Right above "wrap in builder"
+const wrapPriority = 28;
+
+class WrapWithObserver extends MobxAssist {
+  WrapWithObserver();
+
+  @override
+  void run(
+    CustomLintResolver resolver,
+    ChangeReporter reporter,
+    CustomLintContext context,
+    SourceRange target,
+  ) {
+    context.registry.addInstanceCreationExpression((node) {
+      // Select from "new" to the opening bracket
+      if (!target.intersects(node.constructorName.sourceRange)) return;
+
+      final createdType = node.constructorName.type.type;
+
+      if (createdType == null ||
+          !widgetType.isAssignableFromType(createdType)) {
+        return;
+      }
+
+      final changeBuilder = reporter.createChangeBuilder(
+        message: 'Wrap with Observer',
+        priority: wrapPriority,
+      );
+
+      changeBuilder.addDartFileEdit((builder) {
+        builder.addSimpleInsertion(
+          node.offset,
+          'Observer(builder: (context) { return ',
+        );
+        builder.addSimpleInsertion(node.end, '; },)');
+      });
+    });
+  }
+}

mobx_lint/lib/src/mobx_custom_lint.dart

@@ -0,0 +1,13 @@
+import 'package:analyzer/source/source_range.dart';
+import 'package:custom_lint_builder/custom_lint_builder.dart';
+
+abstract class MobxAssist extends DartAssist {
+  @override
+  Future<void> startUp(
+    CustomLintResolver resolver,
+    CustomLintContext context,
+    SourceRange target,
+  ) async {
+    await super.startUp(resolver, context, target);
+  }
+}

mobx_lint/lib/src/mobx_types.dart

@@ -0,0 +1,4 @@
+import 'package:custom_lint_builder/custom_lint_builder.dart';
+
+/// [TypeChecker] from `Widget` from Flutter
+const widgetType = TypeChecker.fromName('Widget', packageName: 'flutter');

mobx_lint/pubspec.yaml

@@ -0,0 +1,21 @@
+name: mobx_lint
+description: mobx_lint is a developer tool for users of mobx, designed to help stop common issues and simplify repetitive tasks.
+version: 1.0.0
+homepage: https://mobx.netlify.app/
+repository: https://github.com/mobxjs/mobx.dart
+issue_tracker: https://github.com/mobxjs/mobx.dart/issues
+
+environment:
+  sdk: ">=2.16.0 <3.0.0"
+
+dependencies:
+  analyzer: ">=6.0.0 <7.0.0"
+  analyzer_plugin: ^0.11.2
+  collection: ^1.16.0
+  custom_lint_builder: ^0.5.2
+  meta: ^1.7.0
+  path: ^1.8.1
+  mobx: ^2.2.0
+dev_dependencies:
+  lints: ^2.0.0
+  test: ^1.21.0

mobx_lint_flutter_test/pubspec.yaml

@@ -0,0 +1,25 @@
+name: mobx_lint_flutter_test
+publish_to: none
+
+environment:
+  sdk: ">=3.0.0 <4.0.0"
+  flutter: ">=3.0.0"
+
+dependencies:
+  flutter:
+    sdk: flutter
+  mobx:
+  flutter_mobx:
+
+
+dev_dependencies:
+  mobx_lint:
+    path: ../mobx_lint
+  test: ^1.15.0
+
+dependency_overrides:
+  mobx:
+    path: ../mobx
+  flutter_mobx:
+    path: ../flutter_mobx
+

mobx_lint_flutter_test/test/all_tests.dart

@@ -0,0 +1,5 @@
+import 'assists/wrap_widget/wrap_widget_test.dart' as wrap_widget_test;
+
+void main() {
+  wrap_widget_test.main();
+}

mobx_lint_flutter_test/test/assists/wrap_widget/wrap_widget.dart

@@ -0,0 +1,14 @@
+import 'package:flutter/material.dart';
+
+class MyWidget extends StatelessWidget {
+  const MyWidget({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    Map();
+
+    return Scaffold(
+      body: Container(),
+    );
+  }
+}

mobx_lint_flutter_test/test/assists/wrap_widget/wrap_widget_test.dart

@@ -0,0 +1,45 @@
+import 'dart:io';
+
+import 'package:analyzer/dart/analysis/results.dart';
+import 'package:analyzer/dart/analysis/utilities.dart';
+import 'package:analyzer/source/source_range.dart';
+import 'package:mobx_lint/src/assists/wrap_with_observer.dart';
+import 'package:test/test.dart';
+
+import '../../golden.dart';
+
+void main() {
+  testGolden(
+    'Wrap with observer',
+    'assists/wrap_widget/wrap_with_observer.json',
+    () async {
+      final assist = WrapWithObserver();
+      final file = File('test/assists/wrap_widget/wrap_widget.dart').absolute;
+
+      final result = await resolveFile2(path: file.path);
+      result as ResolvedUnitResult;
+
+      var changes = [
+        // Map
+        ...await assist.testRun(result, const SourceRange(171, 0)),
+
+        // Scaffold
+        ...await assist.testRun(result, const SourceRange(190, 0)),
+
+        // Container
+        ...await assist.testRun(result, const SourceRange(212, 0)),
+
+        // Between ()
+        ...await assist.testRun(result, const SourceRange(222, 0)),
+      ];
+
+      changes.forEach((element) {
+        print(element);
+      });
+
+      expect(changes, hasLength(2));
+
+      return changes;
+    },
+  );
+}

mobx_lint_flutter_test/test/assists/wrap_widget/wrap_with_observer.json

@@ -0,0 +1 @@
+[{"priority":28,"change":{"message":"Wrap with Observer","edits":[{"fileStamp":0,"edits":[{"offset":228,"length":0,"replacement":"; },)"},{"offset":188,"length":0,"replacement":"Observer(builder: (context) { return "}]}],"linkedEditGroups":[]}},{"priority":28,"change":{"message":"Wrap with Observer","edits":[{"fileStamp":0,"edits":[{"offset":221,"length":0,"replacement":"; },)"},{"offset":210,"length":0,"replacement":"Observer(builder: (context) { return "}]}],"linkedEditGroups":[]}}]