#!/bin/sh

# Plan 9 style diff

diff=/usr/bin/diff

while :
do
	case "$1" in
	-*)
		opts="$opts$1 "
		shift
		;;
	*)
		break
		;;
	esac
done

case $# in
2)
	if [ -d "$1" -a -f "$2" ]
	then
		set "$1/`basename \"$2\"`" "$2"
	elif [ -f "$1" -a -d "$2" ]
	then
		set "$1" "$2/`basename \"$1\"`"
	fi

	exec $diff $opts "$1" "$2"
	;;

*)
	exec $diff $opts ${1+"$@"}
	;;
esac