Use Homebrew::Style for brew cask style.

Library/Homebrew/cask/cmd/style.rb

@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 
 require "json"
+require "style"
 
 module Cask
   class Cmd
@@ -19,48 +20,14 @@ module Cask
         end
       end
 
-      def self.rubocop(*paths, auto_correct: false, debug: false, json: false)
-        Homebrew.install_bundler_gems!
-
-        cache_env = { "XDG_CACHE_HOME" => "#{HOMEBREW_CACHE}/style" }
-        hide_warnings = debug ? [] : [ENV["HOMEBREW_RUBY_PATH"], "-S"]
-
-        args = [
-          "--force-exclusion",
-          "--config", HOMEBREW_LIBRARY/".rubocop.yml"
-        ]
-
-        if json
-          args << "--format" << "json"
-        else
-          if auto_correct
-            args << "--auto-correct"
-          else
-            args << "--debug" if debug
-            args << "--parallel"
-          end
-
-          args << "--format" << "simple"
-          args << "--color" if Tty.color?
-        end
-
-        executable, *args = [*hide_warnings, "rubocop", *args, "--", *paths]
-
-        result = Dir.mktmpdir do |tmpdir|
-          system_command executable, args: args, chdir: tmpdir, env: cache_env,
-                                     print_stdout: !json, print_stderr: !json
-        end
-
-        result.assert_success! unless (0..1).cover?(result.exit_status)
-
-        return JSON.parse(result.stdout) if json
-
-        result
-      end
-
       def run
-        result = self.class.rubocop(*cask_paths, auto_correct: args.fix?, debug: args.debug?)
-        raise CaskError, "Style check failed." unless result.status.success?
+        success = Homebrew::Style.check_style_and_print(
+          cask_paths,
+          fix:     args.fix?,
+          debug:   args.debug?,
+          verbose: args.verbose?,
+        )
+        raise CaskError, "Style check failed." unless success
       end
 
       def cask_paths

Library/Homebrew/style.rb

@@ -119,6 +119,7 @@ module Homebrew
       when :print
         args << "--debug" if debug
         args << "--format" << "simple" if files.present?
+        args << "--color" if Tty.color?
 
         system cache_env, "rubocop", *args
         $CHILD_STATUS.success?

Library/Homebrew/test/cask/cmd/style_spec.rb

@@ -10,34 +10,18 @@ describe Cask::Cmd::Style, :cask do
 
   it_behaves_like "a command that handles invalid options"
 
-  describe ".rubocop" do
+  describe "::run" do
     subject { described_class.rubocop(cask_path) }
 
-    around do |example|
-      FileUtils.ln_s HOMEBREW_LIBRARY_PATH, HOMEBREW_LIBRARY/"Homebrew"
-      FileUtils.ln_s HOMEBREW_LIBRARY_PATH.parent/".rubocop.yml", HOMEBREW_LIBRARY/".rubocop.yml"
-      FileUtils.ln_s HOMEBREW_LIBRARY_PATH.parent/".rubocop_cask.yml", HOMEBREW_LIBRARY/".rubocop_cask.yml"
-      FileUtils.ln_s HOMEBREW_LIBRARY_PATH.parent/".rubocop_rspec.yml", HOMEBREW_LIBRARY/".rubocop_rspec.yml"
-
-      example.run
-    ensure
-      FileUtils.rm_f HOMEBREW_LIBRARY/"Homebrew"
-      FileUtils.rm_f HOMEBREW_LIBRARY/".rubocop.yml"
-      FileUtils.rm_f HOMEBREW_LIBRARY/".rubocop_cask.yml"
-      FileUtils.rm_f HOMEBREW_LIBRARY/".rubocop_rspec.yml"
-    end
-
-    before do
-      allow(Homebrew).to receive(:install_bundler_gems!)
-    end
-
     context "with a valid Cask" do
       let(:cask_path) do
-        Pathname.new("#{HOMEBREW_LIBRARY}/Homebrew/test/support/fixtures/cask/Casks/version-latest.rb")
+        Pathname.new("#{HOMEBREW_LIBRARY_PATH}/test/support/fixtures/cask/Casks/version-latest.rb")
       end
 
-      it "returns true" do
-        expect(subject.success?).to be true
+      it "is successful" do
+        expect {
+          described_class.run(cask_path)
+        }.not_to raise_error
       end
     end
   end