-old=$svn/tags/$tag
-new=$svn/branches/$branch
-echo >&2 "Running diff: $old -> $new"
-LC_ALL=C svn diff --old=$old --new=$new > $out.tmp
-revno=$(sed -ne 's,^[-+]\{3\} .*\t(revision \([0-9]\+\))$,\1,p' $out.tmp | sort -u)
-echo >&2 "Revision $revno"
-sed -i -e "1i# Revision $revno" $out.tmp
-filter < $out.tmp > $out.tmp2 && mv -f $out.{tmp2,tmp}