Add dart-code-metrics

I want version 4.2 as that has avoid-ignoring-return-values, but it
needs a higher version of meta, which flutter_test does not allow.

analysis_options.yaml

@@ -17,6 +17,8 @@ analyzer:
     - "lib/generated_plugin_registrant.dart"
   enable-experiment:
     - nonfunction-type-aliases
+  plugins:
+  - dart_code_metrics
 
 linter:
   rules:
@@ -125,3 +127,26 @@ linter:
 
     # === pub rules ===
     - package_names
+
+dart_code_metrics:
+  metrics-exclude:
+    - test/**
+    - lib/settings/settings_screen.dart
+    - lib/setup/screens.dart
+    - lib/widgets/images/markdown_image.dart
+  metrics:
+    cyclomatic-complexity: 200
+    maximum-nesting-level: 50
+    number-of-parameters: 40
+    source-lines-of-code: 5000
+    number-of-methods: 100
+  rules:
+    - avoid-ignoring-return-values
+    # - avoid-unused-parameters
+    # - double-literal-format
+    # - no-boolean-literal-compare
+    # - no-equal-arguments
+    # - no-magic-number
+    # - no-object-declaration
+    # - prefer-conditional-expressions
+

pubspec.lock

@@ -7,14 +7,28 @@ packages:
       name: _fe_analyzer_shared
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "20.0.0"
+    version: "22.0.0"
   analyzer:
     dependency: transitive
     description:
       name: analyzer
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.4.0"
+    version: "1.7.1"
+  analyzer_plugin:
+    dependency: transitive
+    description:
+      name: analyzer_plugin
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.6.0"
+  ansicolor:
+    dependency: transitive
+    description:
+      name: ansicolor
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.1"
   archive:
     dependency: transitive
     description:
@@ -246,6 +260,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "3.0.1"
+  csslib:
+    dependency: transitive
+    description:
+      name: csslib
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.17.0"
   csv:
     dependency: transitive
     description:
@@ -253,6 +274,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "5.0.0"
+  dart_code_metrics:
+    dependency: "direct dev"
+    description:
+      name: dart_code_metrics
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "4.1.0"
   dart_git:
     dependency: "direct main"
     description:
@@ -647,6 +675,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.1.0"
+  html:
+    dependency: transitive
+    description:
+      name: html
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.15.0"
   http:
     dependency: "direct main"
     description:

pubspec.yaml

@@ -102,6 +102,7 @@ dev_dependencies:
   monarch: ^0.2.0
   build_runner: ^1.10.3
   dashbook: ^0.1.3
+  dart_code_metrics: ^4.1.0
 
 flutter:
   uses-material-design: true