From fba5bf85b020300d29dcdedfdac1e3943b217941 Mon Sep 17 00:00:00 2001
From: Jack Nagel <jacknagel@gmail.com>
Date: Thu, 13 Mar 2014 11:29:48 -0500
Subject: [PATCH] brew-unpack: use extend instead of reopening Formula

---
 Library/Contributions/cmd/brew-unpack.rb | 27 +++++++++++-------------
 1 file changed, 12 insertions(+), 15 deletions(-)

diff --git a/Library/Contributions/cmd/brew-unpack.rb b/Library/Contributions/cmd/brew-unpack.rb
index a86c8b7ff7..3a1db2dcf5 100755
--- a/Library/Contributions/cmd/brew-unpack.rb
+++ b/Library/Contributions/cmd/brew-unpack.rb
@@ -23,24 +23,19 @@ module ScriptDataReader
   end
 end
 
-# Need to tweak the Formula class slightly so that patching is option and `DATA`
-# patches work correctly.
-class Formula
-  # Create a reference to the original Formula.patch method and then override
-  # so that paching only happens if the user asks.
-  alias do_patch patch
+module UnpackPatch
   def patch
-    if ARGV.flag? '--patch'
-      begin
-        old_verbose = $VERBOSE
-        $VERBOSE = nil
-        Formula.const_set 'DATA', ScriptDataReader.load(path)
-      ensure
-        $VERBOSE = old_verbose
-      end
+    return unless ARGV.flag? "--patch"
 
-      do_patch
+    begin
+      old_verbose = $VERBOSE
+      $VERBOSE = nil
+      Formula.const_set "DATA", ScriptDataReader.load(path)
+    ensure
+      $VERBOSE = old_verbose
     end
+
+    super
   end
 end
 
@@ -74,6 +69,8 @@ module Homebrew extend self
     raise "Cannot write to #{unpack_dir}" unless unpack_dir.writable_real?
 
     formulae.each do |f|
+      f.extend(UnpackPatch)
+
       # Create a nice name for the stage folder.
       stage_dir = unpack_dir + [f.name, f.version].join('-')