Add rubocop to ci

.github/workflows/test.yml

@@ -48,6 +48,10 @@ jobs:
         uses: ruby/setup-ruby@v1
         with:
           ruby-version: 2.7
+      - run: bundle install && bundle exec rubocop
+        name: "Run RuboCop"
+        env:
+          RUBOCOP: yes
       - run: bundle install && bundle exec rake test:rails
         env:
           RAILS: 5.2.8

.rubocop.yml

@@ -0,0 +1,17 @@
+inherit_from: .rubocop_todo.yml
+
+# The behavior of RuboCop can be controlled via the .rubocop.yml
+# configuration file. It makes it possible to enable/disable
+# certain cops (checks) and to alter their behavior if they accept
+# any parameters. The file can be placed either in your home
+# directory or in some project directory.
+#
+# RuboCop will start looking for the configuration file in the directory
+# where the inspected file is and continue its way up to the root directory.
+#
+# See https://docs.rubocop.org/rubocop/configuration
+AllCops:
+  DisabledByDefault: true
+  TargetRubyVersion: 2.5
+Security:
+  Enabled: true

.rubocop_todo.yml

@@ -0,0 +1,20 @@
+# This configuration was generated by
+# `rubocop --auto-gen-config`
+# on 2023-10-05 22:09:56 UTC using RuboCop version 1.56.4.
+# The point is for the user to remove these configuration records
+# one by one as the offenses are removed from the code base.
+# Note that changes in the inspected code, or installation of new
+# versions of RuboCop, may require this file to be generated again.
+
+# Offense count: 5
+Security/Eval:
+  Exclude:
+    - 'lib/slim/command.rb'
+    - 'lib/slim/translator.rb'
+    - 'test/literate/run.rb'
+
+# Offense count: 1
+# This cop supports unsafe autocorrection (--autocorrect-all).
+Security/YAMLLoad:
+  Exclude:
+    - 'lib/slim/command.rb'

Gemfile

@@ -41,3 +41,8 @@ if ENV['SINATRA']
     gem 'sinatra', tag: "v#{ENV['SINATRA']}"
   end
 end
+
+if ENV['RUBOCOP']
+  gem 'rubocop'
+  gem 'rubocop-rails'
+end