#!/bin/bash

TAGS_TO_TRANSFER=(
	-Orientation
	-CreateDate
	-ExposureTime
	-FNumber
	-ISO
	-FocalLength
)

extractRAW() {
	[[ -n "$1" ]] || return
	prev="./JPGs/${1%.*}.JPG"
	if [[ ! -e "$prev" ]]; then
		exiftool -progress \
		         -b \
		         -PreviewImage \
		         "$1" \
		         > "$prev"
		exiftool -overwrite_original \
		         -tagsFromFile="$1" \
		         "${TAGS_TO_TRANSFER[@]}" \
		         "$prev"
	fi
}

mkdir -p JPGs
for file; do
	[[ -f $file ]] || continue

	mime="$(file -b --mime-type "$file")"

	if [[ $mime = image/x-canon-cr2 ]]; then
		extractRAW "$file"

	elif [[ "$(head -1 "$file")" = "#Geeqie collection" ]]; then
		while read line; do
			extractRAW "$file"
		done <"$(sed -E '/^#/d;s/(^"|"$)//g' "$file")"

	else
		>&2 printf "Unrecognized format: $file\n"

	fi
done
rmdir JPGs >/dev/null 2>&1