#! /bin/sh

check_res ()
{
    if [ $1 -ne 0 ]; then
	echo 1>&2
	echo "    $2" 1>&2
	res=$1
    fi
}

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

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

if [ "$1" = "-n" ]; then
    shift
    wrapper=
fi

revision=`echo $1 | sed -e 's/\./_/g'`
shift
url=`svn info | sed -n -e 's/^URL://p'`

if [ x$revision  = x ]
then
	echo "usage: $0 <tag | revision> [ file | dir ]"
	echo "available tags are:"
	svn ls $tag
	exit 1
fi

case $revision in
    trunk) 
        tag=$url
        url=`echo $tag | sed -e "s,^\(.*\)\(trunk\|branches\|tags\).*,\1trunk,"` 
	;;
    *) 
        if echo $revision | grep '^[0-9]*$'; then
            tag=$url
            postfix="@$revision"
        else
            tag=`echo $url | sed -e "s,^\(.*\)\(trunk\|branches\|tags\).*,\1tags/fli4l-$revision,"`
        fi
	;;
esac

if [ "$1" ]
then
	while [ "$1" ]
	do
	  if [ "$wrapper" ]; then
		svn diff $wrapper $tag/$1$postfix $url/$1
		check_res $? "svn diff $wrapper $tag/$1 $url/$1"
		shift
	  else
		svn diff $tag/$1$postfix $url/$1
		check_res $? "svn diff $wrapper $tag/$1 $url/$1"
		shift
	  fi
	done
else
	svn diff $wrapper $tag$postfix $url
	check_res $?
fi
exit $res