#!/bin/bash

case "$3x" in
	x)
		NAME=patch-`echo $2 | sed "s/\([^-]*-\)\{1\}//" | sed "s/\/$//"`.diff
		;;

	*)
		NAME=$3
		;;
esac

NAME=`pwd`/$NAME

test -d ~/tmp || mkdir ~/tmp

rm -rf ~/tmp/$1
cp -la $1 ~/tmp/

rm -rf ~/tmp/$2
cp -la $2 ~/tmp/

cd ~/tmp/$1
make distclean > /dev/null

cd ~/tmp/$2
make distclean > /dev/null

cd ~/tmp
diff -NurpP --minimal $1 $2 > $NAME

rm -rf ~/tmp/$1 ~/tmp/$2