style: add --reset-cache option

Library/Homebrew/dev-cmd/style.rb

@@ -27,6 +27,8 @@ module Homebrew
              description: "Fix style violations automatically using RuboCop's auto-correct feature."
       switch "--display-cop-names",
              description: "Include the RuboCop cop name for each violation in the output."
+      switch "--reset-cache",
+             description: "Reset the RuboCop cache."
       comma_array "--only-cops",
                   description: "Specify a comma-separated <cops> list to check for violations of only the "\
                                "listed RuboCop cops."
@@ -51,7 +53,11 @@ module Homebrew
     except_cops = args.except_cops
 
     options = {
-      fix: args.fix?, display_cop_names: args.display_cop_names?, debug: args.debug?, verbose: args.verbose?
+      fix:               args.fix?,
+      display_cop_names: args.display_cop_names?,
+      reset_cache:       args.reset_cache?,
+      debug:             args.debug?,
+      verbose:           args.verbose?,
     }
     if only_cops
       options[:only_cops] = only_cops

Library/Homebrew/style.rb

@@ -40,6 +40,7 @@ module Homebrew
                          fix: false,
                          except_cops: nil, only_cops: nil,
                          display_cop_names: false,
+                         reset_cache: false,
                          debug: false, verbose: false)
       raise ArgumentError, "Invalid output type: #{output_type.inspect}" unless [:print, :json].include?(output_type)
 
@@ -54,6 +55,7 @@ module Homebrew
                     fix: fix,
                     except_cops: except_cops, only_cops: only_cops,
                     display_cop_names: display_cop_names,
+                    reset_cache: reset_cache,
                     debug: debug, verbose: verbose)
       end
 
@@ -71,7 +73,7 @@ module Homebrew
     end
 
     def run_rubocop(files, output_type,
-                    fix: false, except_cops: nil, only_cops: nil, display_cop_names: false,
+                    fix: false, except_cops: nil, only_cops: nil, display_cop_names: false, reset_cache: false,
                     debug: false, verbose: false)
       Homebrew.install_bundler_gems!
       require "rubocop"
@@ -130,6 +132,8 @@ module Homebrew
 
       cache_env = { "XDG_CACHE_HOME" => "#{HOMEBREW_CACHE}/style" }
 
+      FileUtils.rm_rf cache_env["XDG_CACHE_HOME"] if reset_cache
+
       case output_type
       when :print
         args << "--debug" if debug

docs/Manpage.md

@@ -1207,6 +1207,8 @@ including core code and all formulae.
   Fix style violations automatically using RuboCop's auto-correct feature.
 * `--display-cop-names`:
   Include the RuboCop cop name for each violation in the output.
+* `--reset-cache`:
+  Reset the RuboCop cache.
 * `--only-cops`:
   Specify a comma-separated *`cops`* list to check for violations of only the listed RuboCop cops.
 * `--except-cops`:

manpages/brew.1

@@ -1662,6 +1662,10 @@ Fix style violations automatically using RuboCop\'s auto\-correct feature\.
 Include the RuboCop cop name for each violation in the output\.
 .
 .TP
+\fB\-\-reset\-cache\fR
+Reset the RuboCop cache\.
+.
+.TP
 \fB\-\-only\-cops\fR
 Specify a comma\-separated \fIcops\fR list to check for violations of only the listed RuboCop cops\.
 .