Introduce action to ensure every rule is properly documented

.github/workflows/ci.yml

@@ -37,3 +37,21 @@ jobs:
       run: bundle install --jobs 4 --retry 3
     - name: Run tests
       run: bundle exec rake
+  docs-coverage:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@master
+    - name: Setup Ruby
+      uses: actions/setup-ruby@v1
+      with:
+        ruby-version: 3.0.x
+    - uses: actions/cache@v2
+      with:
+        path: vendor/bundle
+        key: gems-build-rails-main-ruby-2.7.x-${{ hashFiles('**/Gemfile.lock') }}
+    - name: Verify docs coverage
+      run: |
+        gem install bundler:2.2.32
+        bundle config path vendor/bundle
+        bundle install --jobs 4 --retry 3
+        bundle exec rake docs:coverage

.rubocop.yml

@@ -5,9 +5,13 @@ inherit_gem:
 
 AllCops:
   NewCops: enable
+  SuggestExtensions: false
 
 Rails/RefuteMethods:
   Enabled: false
 
 Style/Documentation:
   Enabled: false
+
+Rails/RakeEnvironment:
+  Enabled: false

README.md

@@ -31,10 +31,10 @@ linters:
     enabled: true
 ```
 
-### Rules
+## Rules
 
-- [GitHub::Accessibility::ImageHasAlt](./docs/rules/accessibility/no-aria-label-misuse.md)
-- [GitHub::Accessibility::NoAriaLabelMisuse](./docs/rules/accessibility/image-has-alt.md)
+- [GitHub::Accessibility::ImageHasAlt](./docs/rules/accessibility/image-has-alt.md)
+- [GitHub::Accessibility::NoAriaLabelMisuse](./docs/rules/accessibility/no-aria-label-misuse.md)
 - [GitHub::Accessibility::NoRedundantImageAlt](./docs/rules/accessibility/no-redundant-image-alt.md)
 
 ## Testing

Rakefile

@@ -9,5 +9,7 @@ Rake::TestTask.new do |t|
   t.test_files = FileList[ENV["TESTS"] || "test/**/*_test.rb"]
 end
 
+Rake.add_rakelib "lib/tasks"
+
 desc "Run tests"
 task default: :test

lib/tasks/docs.rake

@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+namespace :docs do
+  task :coverage do
+    require "erb_lint/all"
+    require "erblint-github/linters"
+
+    Dir[File.join(__dir__, "linters", "github/**/*.rb")].sort.each do |file|
+      rule_documentation_path = file
+                                .gsub("#{__dir__}linters/github/", "docs/rules/")
+                                .gsub(".rb", ".md")
+                                .tr("_", "-")
+      raise "Missing rule documentation. Please document rule in #{rule_documentation_path}" unless File.file?(rule_documentation_path.to_s)
+    end
+    puts "All rules have been properly documented."
+  end
+end