keg: use Forwardable to methods delegated to #path

Library/Homebrew/keg.rb

@@ -174,6 +174,12 @@ class Keg
   attr_reader :path, :name, :linked_keg_record, :opt_record
   protected :path
 
+  extend Forwardable
+
+  def_delegators :path,
+    :to_s, :hash, :abv, :disk_usage, :file_count, :directory?, :exist?, :/,
+    :join, :rename, :find
+
   def initialize(path)
     path = path.resolved_path if path.to_s.start_with?("#{HOMEBREW_PREFIX}/opt/")
     raise "#{path} is not a valid keg" unless path.parent.parent.realpath == HOMEBREW_CELLAR.realpath
@@ -184,10 +190,6 @@ class Keg
     @opt_record = HOMEBREW_PREFIX/"opt/#{name}"
   end
 
-  def to_s
-    path.to_s
-  end
-
   def rack
     path.parent
   end
@@ -203,30 +205,6 @@ class Keg
   end
   alias eql? ==
 
-  def hash
-    path.hash
-  end
-
-  def abv
-    path.abv
-  end
-
-  def disk_usage
-    path.disk_usage
-  end
-
-  def file_count
-    path.file_count
-  end
-
-  def directory?
-    path.directory?
-  end
-
-  def exist?
-    path.exist?
-  end
-
   def empty_installation?
     Pathname.glob("#{path}/**/*") do |file|
       next if file.directory?
@@ -239,18 +217,6 @@ class Keg
     true
   end
 
-  def /(other)
-    path / other
-  end
-
-  def join(*args)
-    path.join(*args)
-  end
-
-  def rename(*args)
-    path.rename(*args)
-  end
-
   def linked?
     linked_keg_record.symlink? &&
       linked_keg_record.directory? &&
@@ -396,10 +362,6 @@ class Keg
     end
   end
 
-  def find(*args, &block)
-    path.find(*args, &block)
-  end
-
   def oldname_opt_record
     @oldname_opt_record ||= if (opt_dir = HOMEBREW_PREFIX/"opt").directory?
       opt_dir.subdirs.detect do |dir|