#!/bin/sh
#
# thumbnail_reap - remove dead image thumbnails
#
# Run this script in a web directory that has been indexed via
# thumbnail_index.  It'll remove all the thumbnail and info files
# that are no longer used.
#
# (C) 1995,1996 by Jef Poskanzer <jef@acme.com>.  All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
# 
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.

# Defaults.
recurse=no

# Parse args.
while true ; do
    case "$1" in

	-r )
	recurse=yes
	shift
	;;

	-* )
	echo "usage: thumbnail_reap [-r]" >&2
	exit 1
        ;;

	* )
	break
	;;
    esac
done
if [ $# -ne 0 ] ; then
    echo "usage: thumbnail_reap [-r]" >&2
    exit 1
fi

tmp1=/tmp/tr1.$$
tmp2=/tmp/tr2.$$
rm -f $tmp1 $tmp2

( ls | sed 's/\.[^.]*$/_t.jpg/' ; ls | sed 's/\.[^.]*$/_t.info/' ) | sort > $tmp1
( cd .thumbnails ; ls ) | sort > $tmp2
comm -13 $tmp1 $tmp2 | sed 's,^,.thumbnails/,' | xargs rm -f

rm -f $tmp1 $tmp2

# Now recurse if requested.
if [ $recurse = yes ] ; then
    for file in * ; do
	if [ -d "$file" ] ; then
	    echo "$file/" >&2
	    ( cd "$file" ; thumbnail_reap -r )
	fi
    done
fi