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, 'r')
  19 except IOError:
  20         sys.stderr.write('Cannot open mailbox file: ' + mailbox + '\n')
  21         sys.exit(2)
  22
  23 while 1:
  24         line = mail.readline()
  25         if not line: break # EOF
  26         if line[:5] == 'From ':
  27                 # Start of message found
  28                 print line[:-1],
  29                 while 1:
  30                         line = mail.readline()
  31                         if not line: break # EOF
  32                         if line == '\n': break # Blank line ends headers
  33                         if line[:8] == 'Subject:':
  34                                 print `line[9:-1]`,
  35                 print