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nnmaildir nested Maildirs workaround

From: Thomas Schneider
Subject: nnmaildir nested Maildirs workaround
Date: Tue, 18 Sep 2018 17:25:13 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux)


I wanted to use Gnus also for reading mails.  For historical reasons, my
Maildirs are nested (e. g. ~/.maildir/work/INBOX/foo/bar/{cur,new,tmp})
and synced to various IMAP servers.  I still wanted to keep the Maildirs
local, and keep my nested structure, but nnmaildir only supports a flat
hierarchy without leading dots (as mbsync would create them).

Long story short, I now have ~/.nnmaildir with a bunch of symlinks
created by the following script.  It could be better, but for now this
does the trick.

#!/usr/bin/env python3

import os
import os.path
import sys

    maildir = os.environ['MAILDIR']
except KeyError:
    if os.path.exists(os.path.expanduser('~/.maildir')):
        maildir = os.path.expanduser('~/.maildir')
    elif os.path.exists(os.path.expanduser('~/Maildir')):
        maildir = os.path.expanduser('~/Maildir')
        print('no maildir found', file = sys.stderr)

maildirs = {d for d, dirs, _ in os.walk(maildir)
            if 'cur' in dirs} # cur shall be sufficient to make a dir a maildir

nnm = os.path.expanduser('~/.nnmaildir')
if not os.path.exists(nnm):
    os.mkdir(nnm, mode = 0o700)

for d in maildirs:
    n = d[len(maildir) + 1:].replace('/', '.')
    dst = os.path.join(nnm, n)
    if os.path.exists(dst):
    src_rel = os.path.relpath(d, os.path.dirname(dst))
    os.symlink(src_rel, dst)

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