Add and enable rubocop-rails.

This will help us catch and cleanup usage of e.g. `.blank?` and other
helpers we use from ActiveSupport.

.gitignore

@@ -35,6 +35,7 @@
 # Unignore vendored gems
 !**/vendor/bundle/ruby/*/gems/*/lib
 !**/vendor/bundle/ruby/*/gems/rubocop-performance-*/config
+!**/vendor/bundle/ruby/*/gems/rubocop-rails-*/config
 !**/vendor/bundle/ruby/*/gems/rubocop-rspec-*/config
 !**/vendor/bundle/ruby/*/gems/rubocop-sorbet-*/config
 

Library/.rubocop.yml

@@ -13,33 +13,34 @@ AllCops:
   # enable all pending rubocops
   NewCops: enable
   Include:
-    - '**/*.rbi'
+    - "**/*.rbi"
   Exclude:
-    - 'Homebrew/sorbet/rbi/gems/**/*.rbi'
+    - "Homebrew/sorbet/rbi/gems/**/*.rbi"
-    - 'Homebrew/sorbet/rbi/hidden-definitions/**/*.rbi'
+    - "Homebrew/sorbet/rbi/hidden-definitions/**/*.rbi"
-    - 'Homebrew/sorbet/rbi/todo.rbi'
+    - "Homebrew/sorbet/rbi/todo.rbi"
-    - 'Homebrew/sorbet/rbi/upstream.rbi'
+    - "Homebrew/sorbet/rbi/upstream.rbi"
-    - 'Homebrew/bin/*'
+    - "Homebrew/bin/*"
-    - 'Homebrew/vendor/**/*'
+    - "Homebrew/vendor/**/*"
+    - "Taps/*/*/vendor/**/*"
 
 Cask/Desc:
-  Description: 'Ensure that the desc stanza conforms to various content and style checks.'
+  Description: "Ensure that the desc stanza conforms to various content and style checks."
   Enabled: true
 
 Cask/HomepageUrlTrailingSlash:
-  Description: 'Ensure that the homepage url has a slash after the domain name.'
+  Description: "Ensure that the homepage url has a slash after the domain name."
   Enabled: true
 
 Cask/NoDslVersion:
-  Description: 'Do not use the deprecated DSL version syntax in your cask header.'
+  Description: "Do not use the deprecated DSL version syntax in your cask header."
   Enabled: true
 
 Cask/StanzaGrouping:
-  Description: 'Ensure that cask stanzas are grouped correctly. More info at https://github.com/Homebrew/homebrew-cask/blob/HEAD/doc/cask_language_reference/readme.md#stanza-order'
+  Description: "Ensure that cask stanzas are grouped correctly. More info at https://github.com/Homebrew/homebrew-cask/blob/HEAD/doc/cask_language_reference/readme.md#stanza-order"
   Enabled: true
 
 Cask/StanzaOrder:
-  Description: 'Ensure that cask stanzas are sorted correctly. More info at https://github.com/Homebrew/homebrew-cask/blob/HEAD/doc/cask_language_reference/readme.md#stanza-order'
+  Description: "Ensure that cask stanzas are sorted correctly. More info at https://github.com/Homebrew/homebrew-cask/blob/HEAD/doc/cask_language_reference/readme.md#stanza-order"
   Enabled: true
 
 # enable all formulae audits
@@ -105,9 +106,9 @@ Style/HashTransformValues:
 # Allow for license expressions
 Style/HashAsLastArrayItem:
   Exclude:
-    - 'Taps/*/*/*.rb'
+    - "Taps/*/*/*.rb"
-    - '/**/Formula/*.rb'
+    - "/**/Formula/*.rb"
-    - '**/Formula/*.rb'
+    - "**/Formula/*.rb"
 
 # Enabled now LineLength is lowish.
 Style/IfUnlessModifier:
@@ -118,7 +119,7 @@ Style/NumericLiterals:
   MinDigits: 7
   Strict: true
   Exclude:
-    - '**/Brewfile'
+    - "**/Brewfile"
 
 # Zero-prefixed octal literals are widely used and understood.
 Style/NumericLiteralPrefix:
@@ -166,13 +167,30 @@ Performance/Caller:
 Performance/MethodObjectAsBlock:
   Enabled: false
 
+# Cannot use ActiveSupport in RuboCops.
+Rails:
+  Exclude:
+    - "Homebrew/rubocops/**/*"
+
+# Skip these as they only apply to actual Rails and not our ActiveSupport usage.
+Rails/Date:
+  Enabled: false
+Rails/Delegate:
+  Enabled: false
+Rails/SkipsModelValidations:
+  Enabled: false
+Rails/Pluck:
+  Enabled: false
+Rails/TimeZone:
+  Enabled: false
+
 # Don't allow cops to be disabled in casks and formulae.
 Style/DisableCopsWithinSourceCodeDirective:
   Enabled: true
   Include:
-    - 'Taps/*/*/*.rb'
+    - "Taps/*/*/*.rb"
-    - '/**/{Formula,Casks}/*.rb'
+    - "/**/{Formula,Casks}/*.rb"
-    - '**/{Formula,Casks}/*.rb'
+    - "**/{Formula,Casks}/*.rb"
 
 # make our hashes consistent
 Layout/HashAlignment:
@@ -182,9 +200,9 @@ Layout/HashAlignment:
 # `system` is a special case and aligns on second argument, so allow this for formulae.
 Layout/ArgumentAlignment:
   Exclude:
-    - 'Taps/*/*/*.rb'
+    - "Taps/*/*/*.rb"
-    - '/**/Formula/*.rb'
+    - "/**/Formula/*.rb"
-    - '**/Formula/*.rb'
+    - "**/Formula/*.rb"
 
 # this is a bit less "floaty"
 Layout/CaseIndentation:
@@ -208,120 +226,137 @@ Lint/AmbiguousBlockAssociation:
 
 Lint/DuplicateBranch:
   Exclude:
-    - 'Taps/*/*/*.rb'
+    - "Taps/*/*/*.rb"
-    - '/**/{Formula,Casks}/*.rb'
+    - "/**/{Formula,Casks}/*.rb"
-    - '**/{Formula,Casks}/*.rb'
+    - "**/{Formula,Casks}/*.rb"
 
 # needed for lazy_object magic
 Naming/MemoizedInstanceVariableName:
   Exclude:
-    - 'Homebrew/lazy_object.rb'
+    - "Homebrew/lazy_object.rb"
 
 # so many of these in formulae and can't be autocorrected
 # TODO: fix these as `ruby -w` complains about them.
 Lint/AmbiguousRegexpLiteral:
   Exclude:
-    - 'Taps/*/*/*.rb'
+    - "Taps/*/*/*.rb"
-    - '/**/Formula/*.rb'
+    - "/**/Formula/*.rb"
-    - '**/Formula/*.rb'
+    - "**/Formula/*.rb"
 
 # useful for metaprogramming in RSpec
 Lint/ConstantDefinitionInBlock:
   Exclude:
-    - '**/*_spec.rb'
+    - "**/*_spec.rb"
 
 # so many of these in formulae and can't be autocorrected
 Lint/ParenthesesAsGroupedExpression:
   Exclude:
-    - 'Taps/*/*/*.rb'
+    - "Taps/*/*/*.rb"
-    - '/**/Formula/*.rb'
+    - "/**/Formula/*.rb"
-    - '**/Formula/*.rb'
+    - "**/Formula/*.rb"
 
 # Most metrics don't make sense to apply for casks/formulae/taps.
 Metrics/AbcSize:
   Exclude:
-    - 'Taps/**/*'
+    - "Taps/**/*"
-    - '/**/{Formula,Casks}/*.rb'
+    - "/**/{Formula,Casks}/*.rb"
-    - '**/{Formula,Casks}/*.rb'
+    - "**/{Formula,Casks}/*.rb"
 Metrics/BlockLength:
   Exclude:
-    - 'Taps/**/*'
+    - "Taps/**/*"
-    - '/**/{Formula,Casks}/*.rb'
+    - "/**/{Formula,Casks}/*.rb"
-    - '**/{Formula,Casks}/*.rb'
+    - "**/{Formula,Casks}/*.rb"
 Metrics/ClassLength:
   Exclude:
-    - 'Taps/**/*'
+    - "Taps/**/*"
-    - '/**/{Formula,Casks}/*.rb'
+    - "/**/{Formula,Casks}/*.rb"
-    - '**/{Formula,Casks}/*.rb'
+    - "**/{Formula,Casks}/*.rb"
 Metrics/CyclomaticComplexity:
   Exclude:
-    - 'Taps/**/*'
+    - "Taps/**/*"
-    - '/**/{Formula,Casks}/*.rb'
+    - "/**/{Formula,Casks}/*.rb"
-    - '**/{Formula,Casks}/*.rb'
+    - "**/{Formula,Casks}/*.rb"
 Metrics/MethodLength:
   Exclude:
-    - 'Taps/**/*'
+    - "Taps/**/*"
-    - '/**/{Formula,Casks}/*.rb'
+    - "/**/{Formula,Casks}/*.rb"
-    - '**/{Formula,Casks}/*.rb'
+    - "**/{Formula,Casks}/*.rb"
 Metrics/ModuleLength:
   Exclude:
-    - 'Taps/**/*'
+    - "Taps/**/*"
-    - '/**/{Formula,Casks}/*.rb'
+    - "/**/{Formula,Casks}/*.rb"
-    - '**/{Formula,Casks}/*.rb'
+    - "**/{Formula,Casks}/*.rb"
 Metrics/PerceivedComplexity:
   Exclude:
-    - 'Taps/**/*'
+    - "Taps/**/*"
-    - '/**/{Formula,Casks}/*.rb'
+    - "/**/{Formula,Casks}/*.rb"
-    - '**/{Formula,Casks}/*.rb'
+    - "**/{Formula,Casks}/*.rb"
 
 # allow those that are standard
 # TODO: try to remove some of these
 Naming/MethodParameterName:
   AllowedNames:
-    - '_'
+    - "_"
-    - 'a'
+    - "a"
-    - 'b'
+    - "b"
-    - 'cc'
+    - "cc"
-    - 'c1'
+    - "c1"
-    - 'c2'
+    - "c2"
-    - 'd'
+    - "d"
-    - 'e'
+    - "e"
-    - 'f'
+    - "f"
-    - 'ff'
+    - "ff"
-    - 'fn'
+    - "fn"
-    - 'id'
+    - "id"
-    - 'io'
+    - "io"
-    - 'o'
+    - "o"
-    - 'p'
+    - "p"
-    - 'pr'
+    - "pr"
-    - 'r'
+    - "r"
-    - 'rb'
+    - "rb"
-    - 's'
+    - "s"
-    - 'to'
+    - "to"
-    - 'v'
+    - "v"
 
 # GitHub diff UI wraps beyond 118 characters
 Layout/LineLength:
   Max: 118
   # ignore manpage comments and long single-line strings
-  IgnoredPatterns: ['#: ', ' url "', ' mirror "', ' plist_options ',
+  IgnoredPatterns:
-                    ' appcast "', ' executable: "', ' font "', ' homepage "', ' name "',
+    [
-                    ' pkg "', ' pkgutil: "', '#{language}', '#{version.',
+      "#: ",
-                    ' "/Library/Application Support/', '"/Library/Caches/', '"/Library/PreferencePanes/',
+      ' url "',
-                    ' "~/Library/Application Support/', '"~/Library/Caches/', '"~/Application Support',
+      ' mirror "',
-                    ' was verified as official when first introduced to the cask']
+      " plist_options ",
+      ' appcast "',
+      ' executable: "',
+      ' font "',
+      ' homepage "',
+      ' name "',
+      ' pkg "',
+      ' pkgutil: "',
+      "#{language}",
+      "#{version.",
+      ' "/Library/Application Support/',
+      '"/Library/Caches/',
+      '"/Library/PreferencePanes/',
+      ' "~/Library/Application Support/',
+      '"~/Library/Caches/',
+      '"~/Application Support',
+      " was verified as official when first introduced to the cask",
+    ]
 
 Sorbet/FalseSigil:
   Exclude:
-    - 'Taps/**/*'
+    - "Taps/**/*"
-    - '/**/{Formula,Casks}/*.rb'
+    - "/**/{Formula,Casks}/*.rb"
-    - '**/{Formula,Casks}/*.rb'
+    - "**/{Formula,Casks}/*.rb"
-    - 'Homebrew/test/**/Casks/**/*.rb'
+    - "Homebrew/test/**/Casks/**/*.rb"
 
 Sorbet/StrictSigil:
   Enabled: true
   Include:
-    - '**/*.rbi'
+    - "**/*.rbi"
 
 # Try getting rid of these.
 Sorbet/ConstantsFromStrings:
@@ -339,48 +374,48 @@ Style/AccessorGrouping:
 # make rspec formatting more flexible
 Style/BlockDelimiters:
   Exclude:
-    - 'Homebrew/**/*_spec.rb'
+    - "Homebrew/**/*_spec.rb"
-    - 'Homebrew/**/shared_examples/**/*.rb'
+    - "Homebrew/**/shared_examples/**/*.rb"
 
 # TODO: remove this when possible.
 Style/ClassVars:
   Exclude:
-  - '**/developer/bin/*'
+    - "**/developer/bin/*"
 
 # Don't enforce documentation in casks or formulae.
 Style/Documentation:
   Exclude:
-    - 'Taps/**/*'
+    - "Taps/**/*"
-    - '/**/{Formula,Casks}/*.rb'
+    - "/**/{Formula,Casks}/*.rb"
-    - '**/{Formula,Casks}/*.rb'
+    - "**/{Formula,Casks}/*.rb"
-    - '**/*.rbi'
+    - "**/*.rbi"
 
 Style/DocumentationMethod:
   Include:
-    - 'Homebrew/formula.rb'
+    - "Homebrew/formula.rb"
 
 # Not used for casks and formulae.
 Style/FrozenStringLiteralComment:
   EnforcedStyle: always
   Exclude:
-    - 'Taps/*/*/*.rb'
+    - "Taps/*/*/*.rb"
-    - '/**/{Formula,Casks}/*.rb'
+    - "/**/{Formula,Casks}/*.rb"
-    - '**/{Formula,Casks}/*.rb'
+    - "**/{Formula,Casks}/*.rb"
-    - 'Homebrew/test/**/Casks/**/*.rb'
+    - "Homebrew/test/**/Casks/**/*.rb"
-    - '**/*.rbi'
+    - "**/*.rbi"
-    - '**/Brewfile'
+    - "**/Brewfile"
 
 # TODO: remove this when possible.
 Style/GlobalVars:
   Exclude:
-  - '**/developer/bin/*'
+    - "**/developer/bin/*"
 
 # potential for errors in formulae too high with this
 Style/GuardClause:
   Exclude:
-    - 'Taps/*/*/*.rb'
+    - "Taps/*/*/*.rb"
-    - '/**/{Formula,Casks}/*.rb'
+    - "/**/{Formula,Casks}/*.rb"
-    - '**/{Formula,Casks}/*.rb'
+    - "**/{Formula,Casks}/*.rb"
 
 # avoid hash rockets where possible
 Style/HashSyntax:
@@ -389,9 +424,9 @@ Style/HashSyntax:
 # so many of these in formulae and can't be autocorrected
 Style/StringConcatenation:
   Exclude:
-    - 'Taps/*/*/*.rb'
+    - "Taps/*/*/*.rb"
-    - '/**/{Formula,Casks}/*.rb'
+    - "/**/{Formula,Casks}/*.rb"
-    - '**/{Formula,Casks}/*.rb'
+    - "**/{Formula,Casks}/*.rb"
 
 # ruby style guide favorite
 Style/StringLiterals:

Library/Homebrew/Gemfile

@@ -25,6 +25,7 @@ gem "mechanize"
 gem "patchelf"
 gem "plist"
 gem "rubocop-performance"
+gem "rubocop-rails"
 gem "rubocop-rspec"
 gem "rubocop-sorbet"
 gem "ruby-macho"

Library/Homebrew/Gemfile.lock

@@ -70,6 +70,7 @@ GEM
     pry (0.13.1)
       coderay (~> 1.1)
       method_source (~> 1.0)
+    rack (2.2.3)
     rainbow (3.0.0)
     rdiscount (2.2.0.2)
     regexp_parser (2.0.0)
@@ -115,6 +116,10 @@ GEM
     rubocop-performance (1.9.1)
       rubocop (>= 0.90.0, < 2.0)
       rubocop-ast (>= 0.4.0)
+    rubocop-rails (2.8.1)
+      activesupport (>= 4.2.0)
+      rack (>= 1.1)
+      rubocop (>= 0.87.0)
     rubocop-rspec (2.0.0)
       rubocop (~> 1.0)
       rubocop-ast (>= 1.1.0)
@@ -176,6 +181,7 @@ DEPENDENCIES
   rspec-wait
   rubocop
   rubocop-performance
+  rubocop-rails
   rubocop-rspec
   rubocop-sorbet
   ruby-macho

Library/Homebrew/rubocops.rb

@@ -6,6 +6,7 @@ require_relative "load_path"
 require "utils/sorbet"
 
 require "rubocop-performance"
+require "rubocop-rails"
 require "rubocop-rspec"
 require "rubocop-sorbet"