#!/bin/sh

errorAndExit () {
    printf "\033[1;31m$1\033[0m" >&2
    exit $2
}

extractRAW () {
	if [ -r "$1" ]; then
		if [ "$1" != "${1%CR2}" ] && [ ! -f "${1%CR2}JPG" ]; then
			exiftool "$1" -PreviewImage -b > "${1%CR2}JPG"
			echo "${1%CR2}JPG"
		else
			printf "\033[1;31mPreview for $1 exists already.\n\033[0m" >&2
		fi
	fi
}

if [ $# -ne 1 ] || [ ! -r "$1" ]; then
	errorAndExit "Please specify one readable file.\n" 1
fi

if [ "$(file -b --mime-type "$1")" = "image/x-canon-cr2" ]; then
	extractRAW "$1"
elif [ "$(head -n 1 "$1")" = "#Geeqie collection" ]; then
	while read line; do
		if echo "$line" | grep -qv "^#"; then
			line="${line#\"}"
			extractRAW "${line%\"}"
		fi
	done < "$1" # <"$(sed -r '/#/d;s/(^"|"$)//g' "$1")"
else
	errorAndExit "Please specify either a CR2 or a geeqie collection\n" 1
fi