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

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

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