thunderbirdundelete.py

import sys
import re

mail = []

reform = re.compile(r"^From - \w{3} \w{3} \d\d \d\d:\d\d:\d\d \d\d\d\d\r?$")
restatus = re.compile(r"^(X-Mozilla-Status: )(\d\d\d\d)(\r?)$")
output = open("deleted", "wb")

def process():
  deleted = False
  for i in range(len(mail)):
    m = restatus.match(mail[i])
    if m:
      status = int(m.group(2), 16)
      if status & 0x8:
        mail[i] = m.group(1)+"%04x"%(status^0x8)+m.group(3)
        deleted = True
      break
  if deleted:
    for m in mail:
      output.write(m)

for line in open(r"xxx\Inbox", "rb"):
  m = reform.match(line)
  if m:
    if len(mail)>=1 and (mail[-1]=="\n" or mail[-1]=="\r\n"):
      process()
      mail = []
  mail += [line]
process()