#!/usr/bin/env python3.5
# coding=utf-8


"""
merge_images

Usage:  For usage instructions run with option --help
Author: Stephan Porada <sporada@uni-bielefeld.de>

"""

import os
import argparse


def parse_arguments():
    parser = argparse.ArgumentParser(description='Merges given input images '
                                                 'into one multipage tiff.')
    parser.add_argument('-i', dest='input_dir', required=True)
    parser.add_argument('-o', dest='output_dir', required=True)
    return parser.parse_args()


def merge_images(input_dir, output_dir):
    os.system('mkdir {}'.format(output_dir))
    os.system('ls -v {}/*.* >> file_list.txt'.format(input_dir))
    os.system('convert @file_list.txt {}/combined.tiff'.format(output_dir))
    os.system('cat "file_list.txt" | xargs rm')
    os.system('rm file_list.txt')


def main():
    args = parse_arguments()
    merge_images(args.input_dir, args.output_dir)


if __name__ == '__main__':
    main()