a bash script (need imagemagick >6.8.3-10, zip, unzip, unrar) who will convert pictures for pocketbook with an inteligent minimal weight

to_pocketbook.sh

#!/usr/bin/env bash

# a bash script (need imagemagick >6.8.3-10, zip, unzip, unrar) who will convert pictures for pocketbook with an inteligent minimal weight

# create UNARCHIVED folder
# create TRANSFORMED folder
# create OUTPUT folder
#
# for archive file
# 	unarchive in new folder in UNARCHIVED with name file - ext
# 	move archive in BACKUP folder
# 
# for file in UNARCHIVED
# 	convert in optimized jpg to TRANSFORMED (respect path with root from UNARCHIVED)
# 
# for folder in TRANSFORMED
# 	zip it in cbz to OUTPUT

echo '/!\ Warning !'
echo 'This program will crawl your current folder for zip, cbz, rar, cbr files'
echo 'Extract them in UNARCHIVED'
echo 'Convert to PocketBook format your pictures (758x1024) grayscale jpeg in TRANSFORMED'
echo 'Zip it in cbz format in OUTPUT'

read -p '[ENTER] to continue [CTRL+C] to cancel'

size_x=758
size_y=1024
output_format=jpg

mkdir -p UNARCHIVED TRANSFORMED OUTPUT

find . -maxdepth 1 -type f -name "*.zip" -o -name "*.cbz" -o -name "*.rar" -o -name "*.cbr" | while read file; do
	ext="${file##*.}"
	filename="${file##*/}"

	case $ext in
		zip|cbz)
			unzip "$file" -d "UNARCHIVED/${filename%.*}"
			;;
		rar|cbr)
			unrar "$file" "UNARCHIVED/${filename%.*}"
			;;
	esac
done

cd UNARCHIVED
find . -type f | while read file; do
	trailing_file="${file#*./}" # - ./ useless in start of path
	new_file="../TRANSFORMED/${trailing_file%.*}.${output_format}"
	mkdir -p "../TRANSFORMED/${trailing_file%/*}" # création du dossier

	convert -strip -interlace Plane -grayscale Rec709Luma -resize "${size_x}x${size_y}"^ "$file" "$new_file"
done

cd ../TRANSFORMED
find . -maxdepth 1 -mindepth 1 -type d | while read folder; do
	archive="../OUTPUT/${folder}.cbz"

	zip -r "$archive" "$folder"
done