From 80745a97e20f8033ff6ff3a0c0425b22880a944f Mon Sep 17 00:00:00 2001
From: Jack Nagel <jacknagel@gmail.com>
Date: Fri, 7 Jun 2013 22:27:29 -0500
Subject: [PATCH] Add Enumerable#group_by

---
 Library/Homebrew/extend/enumerable.rb | 7 +++++++
 Library/Homebrew/global.rb            | 1 +
 Library/Homebrew/test/testing_env.rb  | 1 +
 3 files changed, 9 insertions(+)
 create mode 100644 Library/Homebrew/extend/enumerable.rb

diff --git a/Library/Homebrew/extend/enumerable.rb b/Library/Homebrew/extend/enumerable.rb
new file mode 100644
index 0000000000..f6765bbae9
--- /dev/null
+++ b/Library/Homebrew/extend/enumerable.rb
@@ -0,0 +1,7 @@
+module Enumerable
+  def group_by
+    inject({}) do |h, e|
+      h.fetch(yield(e)) { |k| h[k] = [] } << e; h
+    end
+  end unless method_defined?(:group_by)
+end
diff --git a/Library/Homebrew/global.rb b/Library/Homebrew/global.rb
index edfce9ac42..cb6e36e073 100644
--- a/Library/Homebrew/global.rb
+++ b/Library/Homebrew/global.rb
@@ -4,6 +4,7 @@ require 'extend/pathname'
 require 'extend/ARGV'
 require 'extend/string'
 require 'extend/symbol'
+require 'extend/enumerable'
 require 'utils'
 require 'exceptions'
 require 'set'
diff --git a/Library/Homebrew/test/testing_env.rb b/Library/Homebrew/test/testing_env.rb
index 8e93884ebe..4e071c000f 100644
--- a/Library/Homebrew/test/testing_env.rb
+++ b/Library/Homebrew/test/testing_env.rb
@@ -12,6 +12,7 @@ require 'extend/fileutils'
 require 'extend/pathname'
 require 'extend/string'
 require 'extend/symbol'
+require 'extend/enumerable'
 require 'exceptions'
 require 'utils'
 require 'rbconfig'