GitDownloadStrategy

Untested

Library/Homebrew/formula.rb

@@ -89,6 +89,26 @@ class SubversionDownloadStrategy <AbstractDownloadStrategy
   end
 end
 
+class GitDownloadStrategy <AbstractDownloadStrategy
+  def fetch
+    ohai "Cloning #{@url}"
+    @clone=HOMEBREW_CACHE+@unique_token
+    unless @clone.exist?
+      safe_system 'git', 'clone', @url, @clone
+    else
+      # TODO git pull?
+      puts "Repository already cloned"
+    end
+  end
+  def stage
+    dst=Dir.getwd
+    Dir.chdir @clone do
+      # http://stackoverflow.com/questions/160608/how-to-do-a-git-export-like-svn-export
+      safe_system 'git', 'checkout-index', '-af', "--prefix=#{dst}"
+    end
+  end
+end
+
 
 class ExecutionError <RuntimeError
   def initialize cmd, args=[]