Rubocopify gem

.gitattributes

@@ -0,0 +1 @@
+.rubocop_todo.yml linguist-generated

.github/workflows/rubocop.yml

@@ -0,0 +1,28 @@
+name: RuboCop
+
+on:
+  push:
+    branches: [ master, develop ]
+  pull_request:
+    branches: [ master, develop ]
+
+permissions:
+  contents: read
+
+jobs:
+  rubocop:
+    name: RuboCop
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        ruby-version: ['3.2']
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Ruby
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: ${{ matrix.ruby-version }}
+        bundler-cache: true
+    - name: RuboCop
+      run: bundle exec rubocop

.rubocop.yml

@@ -0,0 +1,19 @@
+inherit_from: .rubocop_todo.yml
+
+require:
+  - rubocop-performance
+  - rubocop-rake
+  - rubocop-rspec
+
+AllCops:
+  TargetRubyVersion: 2.1
+  NewCops: enable
+  Exclude:
+    - 'bin/*'
+    - 'coverage/**/*'
+    - 'doc/**/*'
+    - 'gemfiles/*'
+    - 'vendor/**/*'
+
+Gemspec:
+  Enabled: false

Gemfile

@@ -1,10 +1,17 @@
+# frozen_string_literal: true
+
 source 'https://rubygems.org'
 gem 'byebug'
 
 # Specify your gem's dependencies in omniauth-cas.gemspec
 gemspec
 
-if RUBY_VERSION < "2.2.2"
+if RUBY_VERSION < '2.2.2'
   # Rack 2 needs Ruby 2.2.2+
   gem 'rack', '< 2'
 end
+
+gem 'rubocop'
+gem 'rubocop-performance'
+gem 'rubocop-rake'
+gem 'rubocop-rspec'

Rakefile

@@ -1,4 +1,6 @@
 #!/usr/bin/env rake
+# frozen_string_literal: true
+
 require 'bundler/gem_tasks'
 
 require 'rspec/core/rake_task'
@@ -11,5 +13,5 @@ RSpec::Core::RakeTask.new(:spec) do |t|
 end
 
 task :test do
-  fail %q{This application uses RSpec. Try running "rake spec"}
+  raise 'This application uses RSpec. Try running "rake spec"'
 end

lib/omniauth/cas.rb

@@ -1,2 +1,4 @@
+# frozen_string_literal: true
+
 require 'omniauth/cas/version'
-require 'omniauth/strategies/cas'
+require 'omniauth/strategies/cas'

lib/omniauth/cas/version.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Omniauth
   module Cas
     VERSION = '2.0.0'