#! /bin/sh

# Thumbnailor! V1.0
# Copyright (C) 2006 Liam Craig McDermott
# 
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
# 
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
# 
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

scriptusage="Usage: thumbs.sh \"pattern\" size quality"
if [ $# -ne 3 ]
then
   #Less than 3 arguments supplied
   echo "Please specify 3 arguments - filename pattern, size and quality \ne.g. thumbs.sh \"*.jpg\" 150 60"
   echo "\n$scriptusage"
   exit 1
fi

if [ $3 -le 0 ] || [ $3 -gt 100 ]
then
   #Third argument not between 1 and 100
   echo "Error: quality argument must be between 1 and 100"
   echo "$scriptusage"
   exit 1
fi

if [ -d "./thumbs" ]
then
   rm -rf "./thumbs"
fi
mkdir thumbs
for img in $1
   #Remember: the first parameter has to be passed with quotes surrounding it! e.g. thumbnail.sh "*.jpg"
do
   imgheight=`identify -format '%h' "$img"`
   imgwidth=`identify -format '%w' "$img"`
   if [ $imgwidth -gt $imgheight ]
   then
      convert $img -thumbnail x$2 -gravity center -crop $2x$2+0+0 -quality $3 "./thumbs/thumb$img"
	 #shrink image height to that of second argument, maintain aspect ratio, then crop image from centre and output to subdirectory
   else
      convert $img -thumbnail $2x -gravity center -crop $2x$2+0+0 -quality $3 "./thumbs/thumb$img"
	 #same as above but shrink image width
   fi
done
exit 0