From 1bb5d4e031f6df6f47fc606ce500bf67b2d46aa2 Mon Sep 17 00:00:00 2001
From: Jack Nagel <jacknagel@gmail.com>
Date: Fri, 1 Feb 2013 13:11:43 -0600
Subject: [PATCH] Add md5 support to compatibility, with deprecation warning

---
 Library/Homebrew/compat/compatibility.rb | 33 ++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/Library/Homebrew/compat/compatibility.rb b/Library/Homebrew/compat/compatibility.rb
index 67f5408442..fbd6ad7378 100644
--- a/Library/Homebrew/compat/compatibility.rb
+++ b/Library/Homebrew/compat/compatibility.rb
@@ -247,3 +247,36 @@ class Version
     to_s.slice *args
   end
 end
+
+
+# MD5 support
+class Formula
+  def self.md5(val=nil)
+    unless val.nil?
+      @stable ||= SoftwareSpec.new
+      @stable.md5(val)
+    end
+    return @stable ? @stable.md5 : @md5
+  end
+end
+
+class SoftwareSpec
+  def md5(val=nil)
+    if val.nil?
+      @checksum if checksum.nil? or @checksum.hash_type == :md5
+    else
+      opoo <<-EOS.undent
+      MD5 support is deprecated and will be removed in a future version.
+      Please switch this formula to #{Checksum::TYPES.map { |t| t.to_s.upcase } * ' or '}.
+      EOS
+      @checksum = Checksum.new(:md5, val)
+    end
+  end
+end
+
+class Pathname
+  def md5
+    require 'digest/md5'
+    incremental_hash(Digest::MD5)
+  end
+end