From b0e50ba13d9ce3a9f8c0e61c6ac54c1337e09c5c Mon Sep 17 00:00:00 2001
From: Max Howell <mxcl@me.com>
Date: Fri, 10 Aug 2012 16:05:30 -0400
Subject: [PATCH] Formula.select and Formula.installed

---
 Library/Homebrew/formula.rb | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/Library/Homebrew/formula.rb b/Library/Homebrew/formula.rb
index b61bb999ae..2f4562449e 100644
--- a/Library/Homebrew/formula.rb
+++ b/Library/Homebrew/formula.rb
@@ -304,6 +304,16 @@ class Formula
     end
   end
 
+  def self.select
+    ff = []
+    each{ |f| ff << f if yield(f) }
+    ff
+  end
+
+  def self.installed
+    HOMEBREW_CELLAR.children.map{ |rack| factory(rack.basename) rescue nil }.compact
+  end
+
   def inspect
     name
   end