#!/bin/bash
#Filename: image_help.sh
#Description: A script for image management

if [ $# -ne 4 -a $# -ne 6 -a $# -ne 8 ];
then
	echo Incorrect number of arguments
	exit 2
fi

while [ $# -ne 0 ];
do

	case $1 in
	-source) shift; source_dir=$1 ; shift ;;
	-scale) shift; scale=$1 ; shift ;;
	-percent) shift; percent=$1 ; shift ;;
	-dest) shift ; dest_dir=$1 ; shift ;;
	-ext) shift ; ext=$1 ; shift ;;
	*) echo Wrong parameters; exit 2 ;;
	esac;

done



for img in `echo $source_dir/*` ;
do
	source_file=$img
	if [[ -n $ext ]];
	then
		dest_file=${img%.*}.$ext
	else
		dest_file=$img
	fi
	
	if [[ -n $dest_dir ]];
	then
		dest_file=${dest_file##*/}
		dest_file="$dest_dir/$dest_file"
	fi

	if [[ -n $scale ]];
	then
		PARAM="-resize $scale"
	elif [[ -n $percent ]];
	then
		PARAM="-resize $percent%"	
	fi

	echo Processing file : $source_file
	convert $source_file $PARAM $dest_file

done