git-like line change counts for svn using svn diff

function svn_line_changes {
    echo "Scanning $@"
    removed=`svn diff $@ | grep "^-[^-]" | wc -l`
    echo "Removed: $removed"
    added=`svn diff $@ | grep "^+[^+]" | wc -l`
    echo "Added: $added"
    difference=`expr $added - $removed`
    echo "Difference: $difference"
    unset removed added difference
}