[nimh-dev] inc

[Joel Uckelman <uckelman@xxxxxxxxx>]

I was thinking about inc this morning, and rather than be blindsided by
finding a Python module which already does most of what we want, I poked
around in the library reference first. Here's what I found:

The module we want is 'mailbox'. I imagine that we want (at least) to read
two formats: mbox and Maildir. mailbox defaults to producing rfc822.Message
objects, but you can feed it a message factory function which will return
arbitrary things.

So, here's a sketch, adapted from the docs for the mailbox module:

import email
import email.Errors
import mailbox

# NB: we can make this return whatever we want;
# maybe files would be better than email.Messages (or our subclass)?
def make_email(fp):
  try:
    return email.message_from_file(fp)
  except email.Errors.MessageParseError:
    # Don't return None since that will
    # stop the mailbox iterator
    return ''

# TODO: read MH stuff
# TODO: figure out what to inc from (read .mh_profile:MailDrop)
# TODO: figure out what kind MailDrop is (proposal: Maildirs end in /)
# TODO: lock the spool (?) if we're reading from the spool
# TODO: figure out what folder to inc to

if mbox:
  fp = file(boxpath, "r+")
  box = mailbox.UnixMailbox(fp) 
elif maildir:
  box = mailbox.Maildir(boxpath)

while 1:  # it irriates me that you can't do assignment
          # in a while loop condition
  m = box.next()
  if m is None: break
  else:
    # TODO: write m into its new home
    # TODO: print the scan line for m
    # TODO: for Maildirs, delete m from the Maildir on successful write

# TODO: do something to truncate the spool if we're reading from it


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