Install and use RuboCop RSpec by default.

Library/Homebrew/cmd/style.rb

@@ -11,8 +11,6 @@
 #:    If `--display-cop-names` is passed, include the RuboCop cop name for each
 #:    violation in the output.
 #:
-#:    If `--rspec` is passed, install and use the RuboCop RSpec gem.
-#:
 #:    Passing `--only-cops=`<cops> will check for violations of only the listed
 #:    RuboCop <cops>, while `--except-cops=`<cops> will skip checking the listed
 #:    <cops>. For either option <cops> should be a comma-separated list of cop names.

Library/Homebrew/style.rb

@@ -18,10 +18,12 @@ module Homebrew
       fix = options[:fix]
 
       Homebrew.install_gem_setup_path! "rubocop", HOMEBREW_RUBOCOP_VERSION
+      Homebrew.install_gem! "rubocop-rspec"
       require "rubocop"
       require "rubocops"
 
       args = %w[
+        --require rubocop-rspec
         --force-exclusion
       ]
       if fix
@@ -34,11 +36,6 @@ module Homebrew
         args += ["--extra-details", "--display-cop-names"]
       end
 
-      if ARGV.include?("--rspec")
-        Homebrew.install_gem! "rubocop-rspec"
-        args += %w[--require rubocop-rspec]
-      end
-
       if options[:except_cops]
         options[:except_cops].map! { |cop| RuboCop::Cop::Cop.registry.qualified_cop_name(cop.to_s, "") }
         cops_to_exclude = options[:except_cops].select do |cop|
@@ -65,11 +62,7 @@ module Homebrew
         File.expand_path(file).start_with? HOMEBREW_LIBRARY_PATH
       end
       config_file = if files.nil? || has_non_formula
-        if ARGV.include?("--rspec")
-          HOMEBREW_LIBRARY_PATH/".rubocop-rspec.yml"
-        else
-          HOMEBREW_LIBRARY_PATH/".rubocop.yml"
-        end
+        HOMEBREW_LIBRARY_PATH/".rubocop.yml"
       else
         HOMEBREW_LIBRARY/".rubocop_audit.yml"
       end

Library/Homebrew/test/Gemfile

@@ -8,6 +8,7 @@ gem "rspec-its", require: false
 gem "rspec-retry", require: false
 gem "rspec-wait", require: false
 gem "rubocop", HOMEBREW_RUBOCOP_VERSION
+gem "rubocop-rspec", require: false
 
 group :development do
   gem "ronn", require: false

Library/Homebrew/test/Gemfile.lock

@@ -52,6 +52,8 @@ GEM
       rainbow (>= 2.2.2, < 4.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (~> 1.0, >= 1.0.1)
+    rubocop-rspec (1.29.1)
+      rubocop (>= 0.58.0)
     ruby-progressbar (1.10.0)
     simplecov (0.16.1)
       docile (~> 1.1)
@@ -73,6 +75,7 @@ DEPENDENCIES
   rspec-retry
   rspec-wait
   rubocop (= 0.59.1)
+  rubocop-rspec
   simplecov
 
 BUNDLED WITH

docs/Manpage.md

@@ -464,8 +464,6 @@ With `--verbose` or `-v`, many commands print extra debugging information. Note
     If `--display-cop-names` is passed, include the RuboCop cop name for each
     violation in the output.
 
-    If `--rspec` is passed, install and use the RuboCop RSpec gem.
-
     Passing `--only-cops=``cops` will check for violations of only the listed
     RuboCop `cops`, while `--except-cops=``cops` will skip checking the listed
     `cops`. For either option `cops` should be a comma-separated list of cop names.

manpages/brew.1

@@ -425,9 +425,6 @@ If \fB\-\-fix\fR is passed, automatically fix style violations using RuboCop\'s
 If \fB\-\-display\-cop\-names\fR is passed, include the RuboCop cop name for each violation in the output\.
 .
 .IP
-If \fB\-\-rspec\fR is passed, install and use the RuboCop RSpec gem\.
-.
-.IP
 Passing \fB\-\-only\-cops=\fR\fIcops\fR will check for violations of only the listed RuboCop \fIcops\fR, while \fB\-\-except\-cops=\fR\fIcops\fR will skip checking the listed \fIcops\fR\. For either option \fIcops\fR should be a comma\-separated list of cop names\.
 .
 .IP