#! /bin/sh

usage()
{
	echo "usage: $0 [ -nr ] tag [ [tag]  file | dir ]"
	echo "available tags are:"
	svn ls $tag
	exit 1
}

get_url()
{
    var=$1
    revarg=$2

    if [ x$revarg  = x ]; then
	usage
    fi

    case $revarg in 
	trunk)  target=trunk ;;
	[0-9]*) target=tags/fli4l-`echo $revarg | sed -e 's/\./_/g'` ;;
	*)      usage ;;
    esac
    eval $var=`echo $url | sed -e "s,^\(.*\)\(trunk\|branches\|tags\).*,\1$target,"`
}

do_diff()
{
    if [ "$remove_rev" ]; then
	svn diff $wrapper $1 $2 $pipe | \
	    sed -e '/^[+-][+-][+-]/s/(revision [0-9]*)//'
    else
	svn diff $wrapper $1 $2 $pipe
    fi
    if [ $? -ne 0 ]; then
	res=$?
	echo 1>&2
        echo "    svn diff $wrapper $1 $2" 1>&2
    fi
}

if [ ! -d .svn ]
then
	echo "no .svn directory found"
	exit 1
fi

res=0
wrapper="--diff-cmd `dirname $0`/diff-wrapper"

while [ "$1" ]; do
    case "$1" in
	-nw) wrapper= ;;
	-nr) remove_rev=yes ;;
	*)   break ;;
    esac
    shift
done

url=`svn info | sed -n -e 's/^URL://p'`
get_url url_left $1 
shift

case $1 in
    [0-9]* | trunk) 
        get_url url_right $1
	shift
	;;
    *)
        url_right=$url
	;;
esac

case $url_left in
    */trunk)
        tmp=$url_right
	url_right=$url_left
	url_left=$tmp
esac

if [ "$1" ]
then
    while [ "$1" ]; do
	do_diff $url_left/$1 $url_right/$1
	shift
    done
else
    do_diff $url_left $url_right
    svn diff $wrapper $tag $url
fi
exit $res