cop to forbid enabling or disabling cops within source code

CHANGELOG.md

@@ -21,6 +21,7 @@
 * [#7823](https://github.com/rubocop-hq/rubocop/pull/7823): Add `IgnoredMethods` configuration in `Metrics/AbcSize`, `Metrics/CyclomaticComplexity`, and `Metrics/PerceivedComplexity` cops. ([@drenmi][])
 * [#7816](https://github.com/rubocop-hq/rubocop/pull/7816): Support Ruby 2.7's numbered parameter for `Style/Lambda`. ([@koic][])
 * [#7829](https://github.com/rubocop-hq/rubocop/issues/7829): Fix an error for `Style/OneLineConditional` when one of the branches contains `next` keyword. ([@koic][])
+* [#7384](https://github.com/rubocop-hq/rubocop/pull/7384): Add new `Style/DisableCopsWithinSourceCodeDirective` cop. ([@egze][])
 
 ### Bug fixes
 
@@ -4424,3 +4425,4 @@
 [@nikitasakov]: https://github.com/nikitasakov
 [@dmolesUC]: https://github.com/dmolesUC
 [@yuritomanek]: https://github.com/yuritomanek
+[@egze]: https://github.com/egze

config/default.yml

@@ -2616,6 +2616,12 @@ Style/Dir:
   Enabled: true
   VersionAdded: '0.50'
 
+Style/DisableCopsWithinSourceCodeDirective:
+  Description: >-
+                 Forbids disabling/enabling cops within source code.
+  Enabled: false
+  VersionAdded: '0.75'
+
 Style/Documentation:
   Description: 'Document classes and non-namespace modules.'
   Enabled: true

lib/rubocop.rb

@@ -423,6 +423,7 @@
 require_relative 'rubocop/cop/style/date_time'
 require_relative 'rubocop/cop/style/def_with_parentheses'
 require_relative 'rubocop/cop/style/dir'
+require_relative 'rubocop/cop/style/disable_cops_within_source_code_directive'
 require_relative 'rubocop/cop/style/documentation_method'
 require_relative 'rubocop/cop/style/documentation'
 require_relative 'rubocop/cop/style/double_cop_disable_directive'

lib/rubocop/cop/style/disable_cops_within_source_code_directive.rb

@@ -0,0 +1,49 @@
+# frozen_string_literal: true
+
+# rubocop:disable Lint/RedundantCopDisableDirective
+
+module RuboCop
+  module Cop
+    module Style
+      # Detects comments to enable/disable RuboCop.
+      # This is useful if want to make sure that every RuboCop error gets fixed
+      # and not quickly disabled with a comment.
+      #
+      # @example
+      #   # bad
+      #   # rubocop:disable Metrics/AbcSize
+      #   def f
+      #   end
+      #   # rubocop:enable Metrics/AbcSize
+      #
+      #   # good
+      #   def fixed_method_name_and_no_rubocop_comments
+      #   end
+      #
+      class DisableCopsWithinSourceCodeDirective < Cop
+        # rubocop:enable Lint/RedundantCopDisableDirective
+        MSG = 'Comment to disable/enable RuboCop.'
+
+        def investigate(processed_source)
+          processed_source.comments.each do |comment|
+            next unless rubocop_directive_comment?(comment)
+
+            add_offense(comment)
+          end
+        end
+
+        def autocorrect(comment)
+          lambda do |corrector|
+            corrector.replace(comment.loc.expression, '')
+          end
+        end
+
+        private
+
+        def rubocop_directive_comment?(comment)
+          comment.text =~ CommentConfig::COMMENT_DIRECTIVE_REGEXP
+        end
+      end
+    end
+  end
+end

manual/cops.md

@@ -334,6 +334,7 @@ In the following section you find all available cops:
 * [Style/DateTime](cops_style.md#styledatetime)
 * [Style/DefWithParentheses](cops_style.md#styledefwithparentheses)
 * [Style/Dir](cops_style.md#styledir)
+* [Style/DisableCopsWithinSourceCodeDirective](cops_style.md#styledisablecopswithinsourcecodedirective)
 * [Style/Documentation](cops_style.md#styledocumentation)
 * [Style/DocumentationMethod](cops_style.md#styledocumentationmethod)
 * [Style/DoubleCopDisableDirective](cops_style.md#styledoublecopdisabledirective)

manual/cops_style.md

@@ -1334,6 +1334,30 @@ path = File.dirname(File.realpath(__FILE__))
 path = __dir__
 ```
 
+## Style/DisableCopsWithinSourceCodeDirective
+
+Enabled by default | Safe | Supports autocorrection | VersionAdded | VersionChanged
+--- | --- | --- | --- | ---
+Disabled | Yes | Yes  | 0.75 | -
+
+Detects comments to enable/disable RuboCop.
+This is useful if want to make sure that every RuboCop error gets fixed
+and not quickly disabled with a comment.
+
+### Examples
+
+```ruby
+# bad
+# rubocop:disable Metrics/AbcSize
+def f
+end
+# rubocop:enable Metrics/AbcSize
+
+# good
+def fixed_method_name_and_no_rubocop_comments
+end
+```
+
 ## Style/Documentation
 
 Enabled by default | Safe | Supports autocorrection | VersionAdded | VersionChanged

spec/rubocop/cop/style/disable_cops_within_source_code_directive_spec.rb

@@ -0,0 +1,29 @@
+# frozen_string_literal: true
+
+RSpec.describe RuboCop::Cop::Style::DisableCopsWithinSourceCodeDirective do
+  subject(:cop) { described_class.new }
+
+  it 'registers an offense for disabled cop within source code' do
+    expect_offense(<<~RUBY)
+      def choose_move(who_to_move)# rubocop:disable Metrics/CyclomaticComplexity
+                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Comment to disable/enable RuboCop.
+      end
+    RUBY
+    expect_correction(<<~RUBY)
+      def choose_move(who_to_move)
+      end
+    RUBY
+  end
+
+  it 'registers an offense for enabled cop within source code' do
+    expect_offense(<<~RUBY)
+      def choose_move(who_to_move)# rubocop:enable Metrics/CyclomaticComplexity
+                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Comment to disable/enable RuboCop.
+      end
+    RUBY
+    expect_correction(<<~RUBY)
+      def choose_move(who_to_move)
+      end
+    RUBY
+  end
+end