Demo/scripts/from.py

   1 #! /usr/bin/env python
   2
   3 # Print From and Subject of messages in $MAIL.
   4 # Extension to multiple mailboxes and other bells & whistles are left
   5 # as exercises for the reader.
   6
   7 import sys, os
   8
   9 # Open mailbox file.  Exits with exception when this fails.
  10
  11 try:
  12     mailbox = os.environ['MAIL']
  13 except (AttributeError, KeyError):
  14     sys.stderr.write('No environment variable $MAIL\n')
  15     sys.exit(2)
  16
  17 try:
  18     mail = open(mailbox)
  19 except IOError:
  20     sys.exit('Cannot open mailbox file: ' + mailbox)
  21
  22 while 1:
  23     line = mail.readline()
  24     if not line:
  25         break # EOF
  26     if line.startswith('From '):
  27         # Start of message found
  28         print line[:-1],
  29         while 1:
  30             line = mail.readline()
  31             if not line or line == '\n':
  32                 break
  33             if line.startswith('Subject: '):
  34                 print repr(line[9:-1]),
  35         print