Limnoria/plugins/FunCommands.py

#!/usr/bin/env python

###
# Copyright (c) 2002, Jeremiah Fincher
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
#   * Redistributions of source code must retain the above copyright notice,
#     this list of conditions, and the following disclaimer.
#   * Redistributions in binary form must reproduce the above copyright notice,
#     this list of conditions, and the following disclaimer in the
#     documentation and/or other materials provided with the distribution.
#   * Neither the name of the author of this software nor the name of
#     contributors to this software may be used to endorse or promote products
#     derived from this software without specific prior written consent.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
###

"""
Provides a multitude of fun, useless commands.
"""

from baseplugin import *
from itertools import imap, ifilter

import os
import gc
import re
import imp
import sys
import new
import md5
import sha
import time
import math
import cmath
import getopt
import socket
import string
import random
import urllib
import inspect
import textwrap
import telnetlib
import threading
import mimetypes

# Stupid printing on import...
from cStringIO import StringIO
sys.stdout = StringIO()
import this
sys.stdout = sys.__stdout__

#import conf
import debug
import utils
import ircmsgs
import privmsgs
import callbacks

example = utils.wrapLines("""
<jemfinch> @list FunCommands
<supybot> base, binary, calc, chr, coin, cpustats, decode, dice, dns, encode, hexlify, kernel, last, lastfrom, leet, levenshtein, lithp, md5, mimetype, netstats, objects, ord, pydoc, rot13, rpn, sha, soundex, unhexlify, uptime, urlquote, urlunquote, xor
<jemfinch> @netstats
<supybot> I have received 211 messages for a total of 19535 bytes.  I have sent 109 messages for a total of 8672 bytes.
<jemfinch> @ord A
<supybot> 65
<jemfinch> @chr 65
<supybot> A
<jemfinch> @base 2 10101010101001010101010101
<supybot> 44733781
<jemfinch> @binary jemfinch
<supybot> 0110101001100101011011010110011001101001011011100110001101101000
<jemfinch> (that's what the bits in a string look like for 'jemfinch')
<jemfinch> @encode string-escape "\x00\x01"
<supybot> \x00\x01
<jemfinch> @decode string-escape "\\x01\\x02"
<supybot> '\x01\x02'
<jemfinch> @hexlify jemfinch
<supybot> 6a656d66696e6368
<jemfinch> @unhexlify 6a656d66696e6368
<supybot> jemfinch
<jemfinch> @xor password The quick brown fox jumps over the lazy dog.
<supybot> '$\t\x16S\x06\x1a\x1b\x07\x1bA\x11\x01\x18\x18\x1cD\x16\x0e\x0bS\x1d\x1a\x1f\x14\x03A\x1c\x05\x12\x1dR\x10\x18\x04S\x1f\x16\x15\x0bD\x14\x0e\x14]'
<jemfinch> (now watch this -- a nested command :))
<jemfinch> @xor password [xor password The quick brown fox jumps over the lazy dog.]
<supybot> The quick brown fox jumps over the lazy dog.
<jemfinch> (xor is a reversible encryption method.  It's easy to crack, so don't use it for real things :))
<jemfinch> @rot13 jemfinch
<supybot> wrzsvapu
<jemfinch> @rot13 [rot13 jemfinch]
<supybot> jemfinch
<jemfinch> @mimetype someSong.mp3
<supybot> audio/mpeg
<jemfinch> @md5 jemfinch
<supybot> cb2faabafafa9037493cf33779a2dc2e
<jemfinch> @unhexlify [md5 jemfinch]
<supybot> /7I<7y.
<jemfinch> @sha jemfinch
<supybot> b06a020b92ff41317f152139a4dda98f6c638812
<jemfinch> @coin
<supybot> heads
<jemfinch> @coin
<supybot> heads
<jemfinch> @coin
<supybot> tails
<jemfinch> @dice 2d20
<supybot> 3 and 10
<jemfinch> @lithp Sally sells seashells by the seashore.
<supybot> THally thellth theathellth by the theathore.
<jemfinch> @dice 4d100
<supybot> 25, 97, 85, and 93
<jemfinch> @leet All your base are belong to us!!
<supybot> 411 y0ur b453 4r3 b310ng +0 uz!!
<jemfinch> @cpustats
<supybot> I have taken 5.4 seconds of user time and 0.29 seconds of system time, for a total of 5.69 seconds of CPU time.  My children have taken 0.0 seconds of user time and 0.0 seconds of system time for a total of 0.0 seconds of CPU time.  I've taken a total of 0.00329929635973% of this computer's time.  Out of 2 spawned threads, I have 1 active.
<jemfinch> @uptime
<supybot> I have been running for 28 minutes and 47 seconds.
<jemfinch> @calc e**(i*pi) + 1
<supybot> 0
<jemfinch> @calc 1+2+3
<supybot> 6
<jemfinch> @rpn 1 2 3 + +
<supybot> 6
<jemfinch> @objects
<supybot> I have 24941 objects: 234 modules, 716 classes, 5489 functions, 1656 dictionaries, 827 lists, and 14874 tuples (and a few other different types).  I have a total of 119242 references.
<jemfinch> @levenshtein supybot supbot
<supybot> 1
<jemfinch> (taht's the edit distance between "supybot" and "supbot")
<jemfinch> @soundex jemfinch
<supybot> J515
<jemfinch> @soundex supercallifragilisticexpealadocious
<supybot> S162
<jemfinch> @soundex supercallifragilisticexpealadocious 20
<supybot> S1624162423221432200
<jemfinch> @pydoc str
<supybot> str(object) -> string. Return a nice string representation of the object. If the argument is a string, the return value is the same object.
<jemfinch> @dns kernel.org
<supybot> 204.152.189.116
<jemfinch> @zen
<supybot> jemfinch: Beautiful is better than ugly.
<jemfinch> @whois ohio-state.edu
<supybot> jemfinch: ohio-state.edu <http://www.educause.edu/edudomain> is active; registered 18-aug-1987, updated 19-aug-2003, expires 18-aug-2004.
""")

class FunCommands(callbacks.Privmsg):
    priority = 98 # Really just to test.
    def __init__(self):
        callbacks.Privmsg.__init__(self)
        self.sentMsgs = 0
        self.recvdMsgs = 0
        self.sentBytes = 0
        self.recvdBytes = 0

    def inFilter(self, irc, msg):
        self.recvdMsgs += 1
        self.recvdBytes += len(str(msg))
        return msg

    def outFilter(self, irc, msg):
        self.sentMsgs += 1
        self.sentBytes += len(str(msg))
        return msg

    def netstats(self, irc, msg, args):
        """takes no arguments

        Returns some interesting network-related statistics.
        """
        irc.reply(msg,
                   'I have received %s messages for a total of %s bytes.  '\
                   'I have sent %s messages for a total of %s bytes.' %\
                   (self.recvdMsgs, self.recvdBytes,
                    self.sentMsgs, self.sentBytes))

    def hexip(self, irc, msg, args):
        """<ip>

        Returns the hexadecimal IP for that IP.
        """
        ip = privmsgs.getArgs(args)
        if not ircutils.isIP(ip):
            irc.error(msg, '%r is not a valid IP.' % ip)
            return
        quads = ip.split('.')
        ret = ""
        for quad in quads:
            i = int(quad)
            ret += '%02x' % i
        irc.reply(msg, ret.upper())
            
    def ord(self, irc, msg, args):
        """<letter>

        Returns the 8-bit value of <letter>.
        """
        letter = privmsgs.getArgs(args)
        if len(letter) != 1:
            irc.error(msg, 'Letter must be of length 1 (for obvious reasons)')
        else:
            irc.reply(msg, str(ord(letter)))

    def chr(self, irc, msg, args):
        """<number>

        Returns the character associated with the 8-bit value <number>
        """
        try:
            i = privmsgs.getArgs(args)
            if i.startswith('0x'):
                base = 16
            elif i.startswith('0b'):
                base = 2
                i = i[2:]
            elif i.startswith('0'):
                base = 8
            else:
                base = 10
            i = int(i, base)
            irc.reply(msg, chr(i))
        except ValueError:
            irc.error(msg, 'That number doesn\'t map to an 8-bit character.')

    def base(self, irc, msg, args):
        """<base> <number>

        Converts from base <base> the number <number>
        """
        (base, number) = privmsgs.getArgs(args, needed=2)
        irc.reply(msg, str(long(number, int(base))))

    def binary(self, irc, msg, args):
        """<text>

        Returns the binary representation of <text>.
        """
        L = []
        for c in privmsgs.getArgs(args):
            LL = []
            i = ord(c)
            counter = 8
            while i:
                counter -= 1
                if i & 1:
                    LL.append('1')
                else:
                    LL.append('0')
                i >>= 1
            while counter:
                LL.append('0')
                counter -= 1
            LL.reverse()
            L.extend(LL)
        irc.reply(msg, ''.join(L))


    def encode(self, irc, msg, args):
        """<encoding> <text>

        Returns an encoded form of the given text; the valid encodings are
        available in the documentation of the Python codecs module:
        <http://www.python.org/doc/lib/node126.html>.
        """
        encoding, text = privmsgs.getArgs(args, needed=2)
        irc.reply(msg, text.encode(encoding))

    def decode(self, irc, msg, args):
        """<encoding> <text>

        Returns an un-encoded form of the given text; the valid encodings are
        available in the documentation of the Python codecs module:
        <http://www.python.org/doc/lib/node126.html>.
        """
        encoding, text = privmsgs.getArgs(args, needed=2)
        irc.reply(msg, text.decode(encoding).encode('utf-8'))

    def hexlify(self, irc, msg, args):
        """<text>

        Returns a hexstring from the given string; a hexstring is a string
        composed of the hexadecimal value of each character in the string
        """
        text = privmsgs.getArgs(args)
        irc.reply(msg, text.encode('hex_codec'))

    def unhexlify(self, irc, msg, args):
        """<hexstring>

        Returns the string corresponding to <hexstring>.  Obviously,
        <hexstring> must be a string of hexadecimal digits.
        """
        text = privmsgs.getArgs(args)
        try:
            irc.reply(msg, text.decode('hex_codec'))
        except TypeError:
            irc.error(msg, 'Invalid input.')

    def xor(self, irc, msg, args):
        """<password> <text>

        Returns <text> XOR-encrypted with <password>.  See
        http://www.yoe.org/developer/xor.html for information about XOR
        encryption.
        """
        (password, text) = privmsgs.getArgs(args, 2)
        passwordlen = len(password)
        i = 0
        ret = []
        for c in text:
            ret.append(chr(ord(c) ^ ord(password[i])))
            i = (i + 1) % passwordlen
        irc.reply(msg, ''.join(ret))

    def mimetype(self, irc, msg, args):
        """<filename>

        Returns the mime type associated with <filename>
        """
        filename = privmsgs.getArgs(args)
        (type, encoding) = mimetypes.guess_type(filename)
        if type is not None:
            irc.reply(msg, type)
        else:
            s = 'I couldn\'t figure out that filename.'
            irc.reply(msg, s)

    def md5(self, irc, msg, args):
        """<text>

        Returns the md5 hash of a given string.  Read
        http://www.rsasecurity.com/rsalabs/faq/3-6-6.html for more information
        about md5.
        """
        text = privmsgs.getArgs(args)
        irc.reply(msg, md5.md5(text).hexdigest())

    def sha(self, irc, msg, args):
        """<text>

        Returns the SHA hash of a given string.  Read
        http://www.secure-hash-algorithm-md5-sha-1.co.uk/ for more information
        about SHA.
        """
        text = privmsgs.getArgs(args)
        irc.reply(msg, sha.sha(text).hexdigest())

    def urlquote(self, irc, msg, args):
        """<text>

        Returns the URL quoted form of the text.
        """
        text = privmsgs.getArgs(args)
        irc.reply(msg, urllib.quote(text))

    def urlunquote(self, irc, msg, args):
        """<text>

        Returns the text un-URL quoted.
        """
        text = privmsgs.getArgs(args)
        s = urllib.unquote(text)
        irc.reply(msg, s)

    def rot13(self, irc, msg, args):
        """<text>

        Rotates <text> 13 characters to the right in the alphabet.  Rot13 is
        commonly used for text that simply needs to be hidden from inadvertent
        reading by roaming eyes, since it's easily reversible.
        """
        text = privmsgs.getArgs(args)
        irc.reply(msg, text.encode('rot13'))

    def coin(self, irc, msg, args):
        """takes no arguments

        Flips a coin and returns the result.
        """
        if random.randrange(0, 2):
            irc.reply(msg, 'heads')
        else:
            irc.reply(msg, 'tails')

    _dicere = re.compile(r'(\d+)d(\d+)')
    def dice(self, irc, msg, args):
        """<dice>d<sides>

        Rolls a die with <sides> number of sides <dice> times.
        For example, 2d6 will roll 2 six-sided dice; 10d10 will roll 10
        ten-sided dice.
        """
        arg = privmsgs.getArgs(args)
        m = re.match(self._dicere, arg)
        if m:
            (dice, sides) = map(int, m.groups())
            if dice > 6:
                irc.error(msg, 'You can\'t roll more than 6 dice.')
            elif sides > 100:
                irc.error(msg, 'Dice can\'t have more than 100 sides.')
            else:
                L = [0] * dice
                for i in xrange(dice):
                    L[i] = random.randrange(1, sides+1)
                irc.reply(msg, utils.commaAndify([str(x) for x in L]))
        else:
            irc.error(msg, 'Dice must be of the form <dice>d<sides>')

    def lithp(self, irc, msg, args):
        """<text>

        Returns the lisping version of <text>
        """
        text = privmsgs.getArgs(args)
        text = text.replace('sh', 'th')
        text = text.replace('SH', 'TH')
        text = text.replace('ss', 'th')
        text = text.replace('SS', 'th')
        text = text.replace('s', 'th')
        text = text.replace('z', 'th')
        text = text.replace('S', 'TH')
        text = text.replace('Z', 'TH')
        text = text.replace('x', 'kth')
        text = text.replace('X', 'KTH')
        irc.reply(msg, text)

    _leettrans = string.maketrans('oOaAeElBTiIts', '004433187!1+5')
    _leetres = ((re.compile(r'\b(?:(?:[yY][o0O][oO0uU])|u)\b'), 'j00'),
                (re.compile(r'fear'), 'ph33r'),
                (re.compile(r'[aA][tT][eE]'), '8'),
                (re.compile(r'[aA][tT]'), '@'),
                (re.compile(r'[sS]\b'), 'z'),
                (re.compile(r'x'), '><'),)
    def leet(self, irc, msg, args):
        """<text>

        Returns the l33tspeak version of <text>
        """
        s = privmsgs.getArgs(args)
        for (r, sub) in self._leetres:
            s = re.sub(r, sub, s)
        s = s.translate(self._leettrans)
        irc.reply(msg, s)

    def cpustats(self, irc, msg, args):
        """takes no arguments

        Returns some interesting CPU-related statistics on the bot.
        """
        (user, system, childUser, childSystem, elapsed) = os.times()
        timeRunning = time.time() - world.startedAt
        activeThreads = threading.activeCount()
        response ='I have taken %s seconds of user time and %s seconds of '\
                  'system time, for a total of %s seconds of CPU time.  My '\
                  'children have taken %s seconds of user time and %s seconds'\
                  ' of system time for a total of %s seconds of CPU time.  ' \
                  'I\'ve taken a total of %s%% of this computer\'s time.  ' \
                  'Out of %s I have %s active.  ' \
                  'I have processed %s.' %\
                    (user, system, user + system,
                     childUser, childSystem, childUser + childSystem,
                     (user+system+childUser+childSystem)/timeRunning,
                     utils.nItems(world.threadsSpawned, 'thread', 'spawned'),
                     activeThreads,
                     utils.nItems(world.commandsProcessed, 'command'))
        irc.reply(msg, response)

    def uptime(self, irc, msg, args):
        """takes no arguments.

        Returns the amount of time the bot has been running.
        """
        response = 'I have been running for %s.' % \
                   utils.timeElapsed(time.time() - world.startedAt)
        irc.reply(msg, response)


    ###
    # So this is how the 'calc' command works:
    # First, we make a nice little safe environment for evaluation; basically,
    # the names in the 'math' and 'cmath' modules.  Then, we remove the ability
    # of a random user to get ints evaluated: this means we have to turn all
    # int literals (even octal numbers and hexadecimal numbers) into floats.
    # Then we delete all square brackets, underscores, and whitespace, so no
    # one can do list comprehensions or call __...__ functions.
    ###
    _mathEnv = {'__builtins__': new.module('__builtins__'), 'i': 1j}
    _mathEnv.update(math.__dict__)
    _mathEnv.update(cmath.__dict__)
    _mathRe = re.compile(r'((?:(?<![A-Fa-f\d])-)?'
                         r'(?:0x[A-Fa-f\d]+|'
                         r'0[0-7]+|'
                         r'\d+\.\d+|'
                         r'\.\d+|'
                         r'\d+\.|'
                         r'\d+))')
    def _complexToString(self, x):
        real = x.real
        imag = x.imag
        if -1e-12 < real < 1e-12 and -1e-12 < imag < 1e-12:
            return '0'
        if int(real) == real:
            real = int(real)
        if int(imag) == imag:
            imag = int(imag)
        if -1e-12 < real < 1e-12:
            real = 0
        if -1e-12 < imag < 1e-12:
            imag = 0
        if imag == 0:
            return str(real)
        elif imag == 1:
            imag = 'i'
        elif imag == -1:
            imag = '-i'
        elif imag < 0:
            imag = '%si' % imag
        elif imag > 0:
            imag = '+%si' % imag
        if real == 0:
            return imag.lstrip('+')
        else:
            return '%s%s' % (real, imag)

    def calc(self, irc, msg, args):
        """<math expression>

        Returns the value of the evaluted <math expression>.  The syntax is
        Python syntax; the type of arithmetic is floating point.
        """
        text = privmsgs.getArgs(args)
        text = text.translate(string.ascii, '_[] \t')
        text = text.replace('lambda', '')
        def handleMatch(m):
            s = m.group(1)
            if s.startswith('0x'):
                i = int(s, 16)
            elif s.startswith('0') and '.' not in s:
                try:
                    i = int(s, 8)
                except ValueError:
                    i = int(s)
            else:
                i = float(s)
            return str(complex(i))
        text = self._mathRe.sub(handleMatch, text)
        try:
            x = complex(eval(text, self._mathEnv, self._mathEnv))
            irc.reply(msg, self._complexToString(x))
        except OverflowError:
            irc.reply(msg, 'Go get scanez, this is a *real* math problem!')
        except Exception, e:
            irc.reply(msg, debug.exnToString(e))

    _rpnEnv = {
        'dup': lambda s: s.extend([s.pop()]*2),
        }
    def rpn(self, irc, msg, args):
        """<rpn math expression>

        Returns the value of an RPN expression.
        """
        stack = []
        for arg in args:
            try:
                stack.append(complex(arg))
            except ValueError: # Not a float.
                if arg in self._mathEnv:
                    f = self._mathEnv[arg]
                    if callable(f):
                        called = False
                        arguments = []
                        while not called and stack:
                            arguments.append(stack.pop())
                            try:
                                stack.append(f(*arguments))
                                called = True
                            except TypeError:
                                pass
                        if not called:
                            irc.error(msg, 'Not enough arguments for %s' % arg)
                            return
                    else:
                        stack.append(f)
                elif arg in self._rpnEnv:
                    self._rpnEnv[arg](stack)
                else:
                    arg2 = stack.pop()
                    arg1 = stack.pop()
                    s = '%s%s%s' % (arg1, arg, arg2)
                    stack.append(eval(s, self._mathEnv, self._mathEnv))
        if len(stack) == 1:
            irc.reply(msg, str(self._complexToString(complex(stack[0]))))
        else:
            s = ', '.join(imap(self._complexToString, imap(complex, stack)))
            irc.reply(msg, 'Stack: [%s]' % s)

    def objects(self, irc, msg, args):
        """takes no arguments.

        Returns the number and types of Python objects in memory."""
        classes = 0
        functions = 0
        modules = 0
        dicts = 0
        lists = 0
        tuples = 0
        refcounts = 0
        objs = gc.get_objects()
        for obj in objs:
            if isinstance(obj, tuple):
                tuples += 1
            elif inspect.isroutine(obj):
                functions += 1
            elif isinstance(obj, dict):
                dicts += 1
            elif isinstance(obj, list):
                lists += 1
            elif inspect.isclass(obj):
                classes += 1
            elif inspect.ismodule(obj):
                modules += 1
            refcounts += sys.getrefcount(obj)
        response = 'I have %s objects: %s modules, %s classes, %s functions, '\
                   '%s dictionaries, %s lists, and %s tuples (and a few other'\
                   ' different types).  I have a total of %s references.' %\
                   (len(objs), modules, classes, functions,
                    dicts, lists, tuples, refcounts)
        irc.reply(msg, response)

    def levenshtein(self, irc, msg, args):
        """<string1> <string2>

        Returns the levenshtein distance (also known as the "edit distance"
        between <string1> and <string2>
        """
        (s1, s2) = privmsgs.getArgs(args, needed=2)
        irc.reply(msg, str(utils.distance(s1, s2)))

    def soundex(self, irc, msg, args):
        """<string> [<length>]

        Returns the Soundex hash to a given length.  The length defaults to
        4, since that's the standard length for a soundex hash.  For unlimited
        length, use 0.
        """
        (s, length) = privmsgs.getArgs(args, optional=1)
        if length:
            length = int(length)
        else:
            length = 4
        irc.reply(msg, utils.soundex(s, length))

    modulechars = '%s%s%s' % (string.ascii_letters, string.digits, '_.')
    def pydoc(self, irc, msg, args):
        """<python function>

        Returns the __doc__ string for a given Python function.
        """
        funcname = privmsgs.getArgs(args)
        if funcname.translate(string.ascii, self.modulechars) != '':
            irc.error('That\'s not a valid module or function name.')
            return
        if '.' in funcname:
            parts = funcname.split('.')
            module = '.'.join(parts[:-1])
            if module not in __builtins__ and module not in sys.modules:
                path = os.path.dirname(os.__file__)
                for name in parts[:-1]:
                    try:
                        info = imp.find_module(name, path)
                        newmodule = imp.load_module(name, *info)
                        path = newmodule.__path__
                        info[1].close()
                    except ImportError:
                        irc.error(msg, 'No such module %s exists.' % module)
                        return
        try:
            s = eval(funcname + '.__doc__')
            s = s.replace('\n\n', '. ')
            s = ' '.join(s.split())
        except (SyntaxError, NameError):
            irc.error(msg, 'No such function exists.')
            return
        except AttributeError:
            irc.error(msg, 'That function has no documentation.')
            return
        irc.reply(msg, s)

    _eightballs = (
        'outlook not so good.',
        'my reply is no.',
        'don\'t count on it.',
        'you may rely on it.',
        'ask again later.',
        'most likely.',
        'cannot predict now.',
        'yes.',
        'yes, most definitely.',
        'better not tell you now.',
        'it is certain.',
        'very doubtful.',
        'it is decidedly so.',
        'concentrate and ask again.',
        'signs point to yes.',
        'my sources say no.',
        'without a doubt.',
        'reply hazy, try again.',
        'as I see it, yes.',
        )
    def eightball(self, irc, msg, args):
        """[<question>]

        Asks the magic eightball a question.
        """
        irc.reply(msg, random.sample(self._eightballs, 1)[0])


    _these = [str(s) for s in this.s.decode('rot13').splitlines() if s]
    _these.pop(0)
    def zen(self, irc, msg, args):
        """takes no arguments

        Returns one of the zen of Python statements.
        """
        irc.reply(msg, random.sample(self._these, 1)[0])

    def dns(self, irc, msg, args):
        """<host|ip>

        Returns the ip of <host> or the reverse DNS hostname of <ip>.
        """
        host = privmsgs.getArgs(args)
        if ircutils.isIP(host):
            hostname = socket.getfqdn(host)
            if hostname == host:
                irc.error(msg, 'Host not found.')
            else:
                irc.reply(msg, hostname)
        else:
            try:
                ip = socket.gethostbyname(host)
                irc.reply(msg, ip)
            except socket.error:
                irc.error(msg, 'Host not found.')
    dns = privmsgs.thread(dns)

    _domains = sets.Set(['com', 'net', 'edu'])
    def whois(self, irc, msg, args):
        """<domain>

        Returns WHOIS information on the registration of <domain>.  <domain>
        must be in tlds .com, .net, or .edu.
        """
        domain = privmsgs.getArgs(args)
        if '.' not in domain or domain.split('.')[-1] not in self._domains:
            irc.error(msg, '<domain> must be in .com, .net, or .edu.')
            return
        t = telnetlib.Telnet('rs.internic.net', 43)
        t.write(domain)
        t.write('\n')
        s = t.read_all()
        for line in s.splitlines():
            line = line.strip()
            if not line:
                continue
            if line.startswith('Registrar'):
                registrar = line.split()[-1].capitalize()
            elif line.startswith('Referral'):
                url = line.split()[-1]
            elif line.startswith('Updated'):
                updated = line.split()[-1]
            elif line.startswith('Creation'):
                created = line.split()[-1]
            elif line.startswith('Expiration'):
                expires = line.split()[-1]
            elif line.startswith('Status'):
                status = line.split()[-1].lower()
        try:
            s = '%s <%s> is %s; registered %s, updated %s, expires %s.' % \
                (domain, url, status, created, updated, expires)
            irc.reply(msg, s)
        except NameError, e:
            debug.printf(e)
            irc.error(msg, 'I couldn\'t find such a domain.')
    whois = privmsgs.thread(whois)
        


Class = FunCommands

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