h/bot.py

#!/usr/bin/python

network = "irc.synirc.net"
nick = "skybot"
channel = "#cobol"

import sys
import os
import glob
import imp
import re
import thread
import Queue
import collections

import irc
import yaml

os.chdir(sys.path[0])   # do stuff relative to the installation directory
sys.path += ['plugins'] # so 'import hook' works without duplication

class Bot(object):
    def __init__(self, nick, channel, network):
        self.nick = nick
        self.channel = channel
        self.network = network

bot = Bot(nick, channel, network)

print 'Loading plugins'
typs = '|'.join('command filter event'.split())
magic_re = re.compile(r'^\s*#!(%s)(?:: +(\S+) *(\S.*)?)?\s*$' % typs)

def reload_plugins(mtime=[0]):
    new_mtime = os.stat('plugins')
    if new_mtime == mtime[0]:
        return

    bot.plugs = collections.defaultdict(lambda: [])

    for filename in glob.glob("plugins/*.py"):
        shortname = os.path.splitext(os.path.basename(filename))[0]
        try:
            plugin = imp.load_source(shortname, filename)
            for obj in vars(plugin).itervalues():
                if hasattr(obj, '_skybot_hook'): #check for magic
                    for type, data in obj._skybot_hook:
                        bot.plugs[type] += [data]
        except Exception, e:
            print '    error:', e

    mtime[0] = new_mtime

reload_plugins()

print '  plugin listing:'
for type, plugs in sorted(bot.plugs.iteritems()):
    print '    %s:' % type
    for plug in plugs:
        out = '      %s:%s:%s' % (plug[0])
        print out,
        if len(plug) == 3 and 'hook' in plug[2]:
            print '%s%s' % (' ' * (35 - len(out)), plug[2]['hook'])
        else:
            print
print

print 'Connecting to IRC'
bot.irc = irc.irc(network, nick)
bot.irc.join(channel)
bot.commandprefix = '^(?:\.|'+nick+'[:,]*\s*)'

print 'Running main loop'

class Input(object):
    def __init__(self, raw, prefix, command, 
            params, nick, user, host, paraml, msg):
        self.raw = raw
        self.prefix = prefix
        self.command = command
        self.params = params
        self.nick = nick
        self.user = user
        self.host = host
        self.paraml = paraml
        self.msg = msg

class FakeBot(object):
    def __init__(self, bot, input, func):
        self.bot = bot
        self.input = input
        self.msg = bot.irc.msg
        self.cmd = bot.irc.cmd
        self.join = bot.irc.join
        self.func = func
        self.doreply = True
        if input.command == "PRIVMSG":
            self.chan = input.paraml[0]

    def say(self, msg):
        self.bot.irc.msg(self.input.paraml[0], msg)

    def reply(self, msg):
        self.say(self.input.nick + ': ' + msg)

    def run(self):
        ac = self.func.func_code.co_argcount
        if ac == 2:
            out = self.func(self, self.input)
        elif ac == 1:
            out = self.func(self.input.inp)
        if out is not None:
            if self.doreply:
                self.reply(unicode(out))
            else:
                self.say(unicode(out))

while True:
    try: 
        out = bot.irc.out.get(timeout=1)
        reload_plugins()
        for csig, func, args in (bot.plugs['command'] + bot.plugs['event']):
            input = Input(*out)
            for fsig, sieve in bot.plugs['sieve']:
                try:
                    input = sieve(bot, input, func, args)
                except Exception, e:
                    print 'filter error:', e
                    input = None
                if input == None:
                    break
            if input == None:
                continue
            print '<<<', input.raw
            thread.start_new_thread(FakeBot(bot, input, func).run, ())
    except Queue.Empty:
        pass