#!/bin/bash
#
# Assumes a lot about invocation:
# commit1 commit2 -- path

EXT="${4##*.}"

case "$EXT" in
    png|jpg|bmp)
	F1=$(mktemp --suffix=$EXT)
	git cat-file -p $1:$4 > $F1
	F2=$(mktemp --suffix=$EXT)
	git cat-file -p $2:$4 > $F2
	montage $F1 $F2 -tile 2x1 -geometry +5+5 -border 2  png:- | display -
	rm -f $F1 $F2
	;;
    *)
	git meld $*
	;;
esac