ci: check code metrics

.gitlab-ci.yml

@@ -82,6 +82,22 @@ code_analyze:
     - dart format lib/ test/ test_driver/ --set-exit-if-changed
     - dart analyze
 
+code_quality:
+  tags:
+    - docker
+  stage: coverage
+  image: google/dart
+  before_script:
+    - dart pub global activate dart_code_metrics
+  script:
+    - dart pub global run dart_code_metrics:metrics lib -r gitlab > code-quality-report.json
+  artifacts:
+    reports:
+      codequality: code-quality-report.json
+    # also create an actual artifact for inspection purposes
+    paths:
+      - code-quality-report.json
+
 build_doc:
   tags:
     - docker

analysis_options.yaml

@@ -19,3 +19,36 @@ analyzer:
     - example/main.dart
     # needed until crypto packages upgrade
     - lib/src/database/database.g.dart
+  plugins:
+    # Show code metrics in IDE
+    - dart_code_metrics
+
+dart_code_metrics:
+  metrics:
+    cyclomatic-complexity: 20
+    number-of-arguments: 4
+    maximum-nesting-level: 5
+    source-lines-of-code: 50
+    # This is still unstable, so handle with care
+    maintainability-index: 40
+  metrics-exclude:
+    - test/**
+  rules:
+    #- newline-before-return
+    - no-boolean-literal-compare
+    - no-empty-block
+    #- prefer-trailing-comma
+    - prefer-conditional-expressions
+    - no-equal-arguments
+    - no-equal-then-else
+    - no-magic-number:
+        severity: style # too noisy otherwise atm
+    - avoid-late-keyword:
+        severity: style # too noisy otherwise atm
+    - avoid-non-null-assertion:
+        severity: style # too noisy otherwise atm
+    - avoid-unused-parameters
+    - binary-expression-operand-order
+  anti-patterns:
+    - long-method
+    - long-parameter-list

pubspec.yaml

@@ -25,6 +25,7 @@ dependencies:
   collection: ^1.15.0
 
 dev_dependencies:
+  dart_code_metrics: ^4.4.0
   pedantic: ^1.11.0
   test: ^1.15.7
   coverage: ">=0.15.0 <2.0.0"