modules/subtext.py

   1 # Erebus IRC bot - Author: Erebus Team
   2 # vim: fileencoding=utf-8
   3 # module for 's/regex/replacement/' style correction
   4 # warning: arbitrary regex's are generally capable of various DoS attacks on CPU/memory usage. use with caution.
   5 # see for usage examples: https://github.com/zonidjan/erebus/commit/d7e9802778477f1faa26a03078cb1b3c018a5e5c
   6 # This file is released into the public domain; see http://unlicense.org/
   7
   8 # module info
   9 modinfo = {
  10         'author': 'Erebus Team',
  11         'license': 'public domain',
  12         'compatible': [0], # compatible module API versions
  13         'depends': [], # other modules required to work properly?
  14         'softdeps': [], # modules which are preferred but not required
  15 }
  16
  17 # preamble
  18 import modlib
  19 lib = modlib.modlib(__name__)
  20 modstart = lib.modstart
  21 modstop = lib.modstop
  22
  23 # module code
  24 import re
  25 from collections import namedtuple
  26 re_findsub = re.compile(r"""s([/'";:!@#$%^&-_=`~])(?P<search>.+?)\1(?P<replace>.+?)(?:\1(?P<global>g)?|$)""")
  27 Line = namedtuple('Line', ['sender', 'msg'])
  28 lastline = {}
  29 @lib.hooknum("PRIVMSG")
  30 def privmsg_hook(bot, line):
  31         pieces = line.split(None, 3)
  32         fromnick = pieces[0][1:].split('!')[0]
  33         chan = pieces[2]
  34         if chan[0] != "#": return
  35         msg = pieces[3][1:]
  36
  37         mo = re_findsub.match(msg)
  38         if mo:
  39                 if mo.group('global') is not None:
  40                         count = 0 # unlimited
  41                 else:
  42                         count = 1 # only first
  43                 try:
  44                         newline = re.sub(mo.group('search'), mo.group('replace'), lastline[chan].msg, count)
  45                 except Exception as e: return # ignore it if it doesn't work
  46                 if newline != lastline[chan].msg:
  47                         if lastline[chan].sender == fromnick:
  48                                 bot.msg(chan, "<%s> %s" % (lastline[chan].sender, newline))
  49                         else:
  50                                 bot.msg(chan, "%s: <%s> %s" % (fromnick, lastline[chan].sender, newline))
  51         else:
  52                 lastline[chan] = Line(sender=fromnick, msg=msg)