Pluginfy rubocop-i18n

This PR makes rubocop-i18n support RuboCop's Plugin feature.

It replaces the ad-hoc `Inject` with RuboCop plugins introduced in RuboCop 1.72.
Additionally, since RuboCop already requires Ruby 2.7 or higher as its runtime,
the `required_ruby_version` will be updated to 2.7.

Follow-up rubocop/rubocop#13792

Author: koic

.rubocop.yml

@@ -1,12 +1,15 @@
 inherit_from: .rubocop_todo.yml
+
+plugins:
+  - rubocop-internal_affairs
+
 require:
-  - rubocop/cop/internal_affairs
   - rubocop-rake
   - rubocop-rspec
   - rubocop-performance
 
 AllCops:
-  TargetRubyVersion: 2.5
+  TargetRubyVersion: 2.7
   NewCops: enable
 
 # rubocop-i18n does not have config/default.

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ### [master (Unreleased)](https://github.com/rubocop/rubocop-i18n/compare/v3.1.0...master)
 
+* Pluginfy rubocop-i18n (#65)
+
 ### [3.1.0](https://github.com/rubocop/rubocop-i18n/compare/v3.0.0...v3.1.0)
 
 * Transfer ownership of rubocop-i18n from puppetlabs org to rubocop org (#62)

README.md

@@ -28,8 +28,9 @@ Or install it yourself as:
 ## Usage
 
 In your `rubocop.yml`:
-```
-require:
+
+```yaml
+plugins:
  - rubocop-i18n
 ...
 # You *must* choose GetText or Rails-i18n style checking
@@ -58,6 +59,9 @@ I18n/RailsI18n/DecorateString:
   Enabled: false
 ```
 
+> [!NOTE]
+> The plugin system is supported in RuboCop 1.72+. In earlier versions, use `require` instead of `plugins`.
+
 ## Cops
 
 ### I18n/GetText/DecorateString

lib/rubocop-i18n.rb

@@ -3,8 +3,5 @@
 require 'rubocop'
 
 require_relative 'rubocop/i18n'
-require_relative 'rubocop/i18n/inject'
-
-RuboCop::I18n::Inject.defaults!
-
+require_relative 'rubocop/i18n/plugin'
 require_relative 'rubocop/cop/i18n_cops'

lib/rubocop/i18n.rb

@@ -3,9 +3,5 @@
 module RuboCop
   # RuboCop I18n project namespace
   module I18n
-    PROJECT_ROOT = Pathname.new(__dir__).parent.parent.expand_path.freeze
-    CONFIG_DEFAULT = PROJECT_ROOT.join('config', 'default.yml').freeze
-
-    private_constant(:CONFIG_DEFAULT, :PROJECT_ROOT)
   end
 end

lib/rubocop/i18n/inject.rb

@@ -0,0 +1,31 @@
+# frozen_string_literal: true
+
+require 'lint_roller'
+
+module RuboCop
+  module I18n
+    # A plugin that integrates rubocop-i18n with RuboCop's plugin system.
+    class Plugin < LintRoller::Plugin
+      def about
+        LintRoller::About.new(
+          name: 'rubocop-i18n',
+          version: Version::STRING,
+          homepage: 'https://github.com/rubocop/rubocop-i18n',
+          description: 'RuboCop rules for i18n.'
+        )
+      end
+
+      def supported?(context)
+        context.engine == :rubocop
+      end
+
+      def rules(_context)
+        LintRoller::Rules.new(
+          type: :path,
+          config_format: :rubocop,
+          value: Pathname.new(__dir__).join('../../../config/default.yml')
+        )
+      end
+    end
+  end
+end

lib/rubocop/i18n/plugin.rb

@@ -20,11 +20,13 @@ Gem::Specification.new do |spec|
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ['lib']
 
-  spec.required_ruby_version = '>= 2.5.8'
+  spec.required_ruby_version = '>= 2.7.0'
 
   spec.metadata = {
-    'rubygems_mfa_required' => 'true'
+    'rubygems_mfa_required' => 'true',
+    'default_lint_roller_plugin' => 'RuboCop::I18n::Plugin'
   }
 
-  spec.add_dependency 'rubocop', '~> 1.0'
+  spec.add_dependency 'lint_roller', '~> 1.1'
+  spec.add_dependency 'rubocop', '~> 1.72.1'
 end

rubocop-i18n.gemspec

@@ -36,6 +36,4 @@
     mocks.syntax = :expect # Disable `should_receive` and `stub`
     mocks.verify_partial_doubles = true
   end
-
-  config.include(RuboCop::RSpec::ExpectOffense)
 end