Use Library/.rubocop.yml file.

This allows having a shared style that’s use for Homebrew/brew and taps
which can be overridden by Homebrew/brew.

Library/.rubocop.yml

@@ -73,6 +73,15 @@ Style/EmptyLineBetweenDefs:
 Style/FileName:
   Regex: !ruby/regexp /^[\w\@\-\+\.]+(\.rb)?$/
 
+Style/GuardClause:
+  Enabled: false
+
+Style/HashSyntax:
+  EnforcedStyle: hash_rockets
+
+Style/IfUnlessModifier:
+  Enabled: false
+
 Style/IndentArray:
   EnforcedStyle: special_inside_parentheses
 

Library/Homebrew/.rubocop.yml

@@ -1,5 +1,5 @@
 inherit_from:
-  - ../.rubocop_common.yml
+  - ../.rubocop.yml
   - .rubocop_todo.yml
 
 AllCops:

Library/Homebrew/cmd/style.rb

@@ -56,7 +56,7 @@ module Homebrew
       args << "--config" << HOMEBREW_LIBRARY_PATH/".rubocop.yml"
       args += [HOMEBREW_LIBRARY_PATH]
     else
-      args << "--config" << Tap::TAP_DIRECTORY/".rubocop.yml"
+      args << "--config" << HOMEBREW_LIBRARY/".rubocop.yml"
       args << "--format" << "simple"
       args += files
     end