New plowshare.rb based on that from rybesh

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

Formula/plowshare.rb

@@ -0,0 +1,45 @@
+require 'formula'
+
+class Plowshare <Formula
+  head 'http://plowshare.googlecode.com/svn/trunk/'
+  homepage 'http://code.google.com/p/plowshare'
+
+  depends_on 'recode'
+  depends_on 'imagemagick'
+  depends_on 'tesseract'
+  depends_on 'spidermonkey'
+  depends_on 'aview'
+  depends_on 'coreutils'
+  depends_on 'gnu-sed'
+  depends_on 'gnu-getopt'
+
+  def patches
+    DATA
+  end
+
+  def install
+    ENV["PREFIX"] = prefix
+    system "bash setup.sh install"
+  end
+end
+
+
+#This patch makes sure GNUtools are used on OSX. 
+#gnu-getopt is keg-only hence the backtick expansion.
+#These aliases only exist for the duration of plowshare,
+#inside the plowshare shells. Normal operation of bash is
+#unaffected - getopt will still find the version supplied 
+#by OSX in other shells, for example.
+__END__
+--- a/src/lib.sh
++++ b/src/lib.sh
+@@ -1,4 +1,8 @@
+ #!/bin/bash
++shopt -s expand_aliases
++alias sed='gsed'
++alias getopt='`brew --prefix gnu-getopt`/bin/getopt'
++alias head='ghead'
+ #
+ # This file is part of Plowshare.
+ #
+