maildir2mailbox

md2mb.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
Florian Le Frioux, 18 January 2015 - PEP8 compliant
Shane Dowling, 8 Feb 2013
Frédéric Grosshans, 19 January 2012
Nathan R. Yergler, 6 June 2010
This file does not contain sufficient creative expression to invoke
assertion of copyright. No warranty is expressed or implied; use at
your own risk.
---
Uses Python's included mailbox library to convert mail archives from
maildir [http://en.wikipedia.org/wiki/Maildir] to
mbox [http://en.wikipedia.org/wiki/Mbox] format, icluding subfolder.
See http://docs.python.org/library/mailbox.html#mailbox.Mailbox for
full documentation on this library.
---
To run, save as md2mb.py and run:
$ python md2mb.py [maildir_path] [mbox_filename]
[maildir_path] should be the the path to the actual maildir (containing new,
cur, tmp, and the subfolders, which are hidden directories with names like
.subfolde.subsubfolder.subsubsbfolder);
[mbox_filename] will be newly created, as well as a [mbox_filename].sbd the
directory.
"""
import mailbox
import sys
import email
import os


def maildir2mailbox(maildirname, mboxfilename):
    """
    slightly adapted from maildir2mbox.py,
    Nathan R. Yergler, 6 June 2010
    http://yergler.net/blog/2010/06/06/batteries-included-or-maildir-to-mbox-again/
    and Frédéric Grosshans, 19 January 2012
    http://stackoverflow.com/questions/2501182/convert-maildir-to-mbox
    """
    # open the existing maildir and the target mbox file
    maildir = mailbox.Maildir(maildirname, email.message_from_file)
    mbox = mailbox.mbox(mboxfilename)
    # lock the mbox
    mbox.lock()
    # iterate over messages in the maildir and add to the mbox
    for msg in maildir:
        mbox.add(msg)
    # close and unlock
    mbox.close()
    maildir.close()

# Creates the main mailbox
dirname = sys.argv[-2]
mboxname = sys.argv[-1]
mboxdirname = mboxname + '.sbd'

if not os.path.exists(mboxdirname):
    os.makedirs(mboxdirname)


# Iterate over all folders
def folder_iterate(dirname, mboxname):
    listofdirs = [dn for dn in os.walk(dirname).next()[1]
                  if dn not in ['new', 'cur', 'tmp']]
    for curfold in listofdirs:
        curlist = [mboxname] + curfold.split('.')
        curpath = os.path.join(*[dn + '.sbd' for dn in curlist if dn])
        if not os.path.exists(curpath):
            os.makedirs(curpath)
        try:
            maildir2mailbox(os.path.join(dirname, curfold), curpath[:-4])
        except OSError:
            print('no maildir folders')
        folder_iterate(os.path.join(dirname, curfold), mboxname)
folder_iterate(dirname, mboxname)
print('Done')