#! /usr/bin/env python3
import sys
import mailbox

if len(sys.argv) < 2:
    print('Usage: {} listname [newname]'.format(sys.argv[0]))
    sys.exit(1)
try:
    mbox = mailbox.mbox('/opt/mailman/backup-mm2/{}/digest.mbox'.format(
                        sys.argv[1], create=False))
except (mailbox.NoSuchMailboxError, FileNotFoundError):
    print('Nothing to do.')
    sys.exit()
if len(sys.argv) == 2:
    name = sys.argv[1]
else:
    name = sys.argv[2]
mmdf = mailbox.MMDF(
        '/opt/mailman/mm/var/lists/{}.python.org/digest.mmdf'.format(
        name))
for msg in mbox:
    mmdf.add(msg)
mbox.close()
mmdf.close()