maildir2mbox.py

#!/usr/bin/python3

import sys
import re
import os
import mailbox

def convert(maildir, mbox_name):
    mbox = mailbox.mbox(mbox_name)

    total = len(maildir.keys())
    print('Processing', total, 'emails in', mbox_name, file=sys.stderr)

    count = 0
    for key in sorted(maildir.keys()):
        # print progress
        print(':: {:2}% done\r'.format(int((count/total)*100)), file=sys.stderr, end='')
        count += 1

        mbox.add(maildir.get_message(key))
        mbox.flush()

    mbox.close()
    print('Done.                      ')

if __name__ == '__main__':
    maildir = mailbox.Maildir('.')
    main = os.getcwd().split('/')[-1]
    print(main)
    convert(maildir, '/tmp/{}.mbox'.format(main))

    for folder in maildir.list_folders():
        submaildir = maildir.get_folder(folder)
        if len(submaildir.keys()) > 0:
            convert(submaildir, '/tmp/{}.{}.mbox'.format(main, folder))