Limnoria/plugins/Channel/plugin.py

###
# Copyright (c) 2002-2005, 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.
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#   * 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.
#
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# 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
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###

import sys

import supybot.conf as conf
import supybot.ircdb as ircdb
import supybot.utils as utils
from supybot.commands import *
import supybot.ircmsgs as ircmsgs
import supybot.schedule as schedule
import supybot.ircutils as ircutils
import supybot.callbacks as callbacks

class Channel(callbacks.Plugin):
    def __init__(self, irc):
        self.__parent = super(Channel, self)
        self.__parent.__init__(irc)
        self.invites = {}

    def doKick(self, irc, msg):
        channel = msg.args[0]
        if msg.args[1] == irc.nick:
            if self.registryValue('alwaysRejoin', channel):
                networkGroup = conf.supybot.networks.get(irc.network)
                irc.sendMsg(networkGroup.channels.join(channel))

    def _sendMsg(self, irc, msg):
        irc.queueMsg(msg)
        irc.noReply()

    def mode(self, irc, msg, args, channel, modes):
        """[<channel>] <mode> [<arg> ...]

        Sets the mode in <channel> to <mode>, sending the arguments given.
        <channel> is only necessary if the message isn't sent in the channel
        itself.
        """
        self._sendMsg(irc, ircmsgs.mode(channel, modes))
    mode = wrap(mode, ['op', ('haveOp', 'change the mode'), many('something')])

    def limit(self, irc, msg, args, channel, limit):
        """[<channel>] [<limit>]

        Sets the channel limit to <limit>.  If <limit> is 0, or isn't given,
        removes the channel limit.  <channel> is only necessary if the message
        isn't sent in the channel itself.
        """
        if limit:
            self._sendMsg(irc, ircmsgs.mode(channel, ['+l', limit]))
        else:
            self._sendMsg(irc, ircmsgs.mode(channel, ['-l']))
    limit = wrap(limit, ['op', ('haveOp', 'change the limit'),
                        additional('nonNegativeInt', 0)])

    def moderate(self, irc, msg, args, channel):
        """[<channel>]

        Sets +m on <channel>, making it so only ops and voiced users can
        send messages to the channel.  <channel> is only necessary if the
        message isn't sent in the channel itself.
        """
        self._sendMsg(irc, ircmsgs.mode(channel, ['+m']))
    moderate = wrap(moderate, ['op', ('haveOp', 'moderate the channel')])

    def unmoderate(self, irc, msg, args, channel):
        """[<channel>]

        Sets -m on <channel>, making it so everyone can
        send messages to the channel.  <channel> is only necessary if the
        message isn't sent in the channel itself.
        """
        self._sendMsg(irc, ircmsgs.mode(channel, ['-m']))
    unmoderate = wrap(unmoderate, ['op', ('haveOp', 'unmoderate the channel')])

    def key(self, irc, msg, args, channel, key):
        """[<channel>] [<key>]

        Sets the keyword in <channel> to <key>.  If <key> is not given, removes
        the keyword requirement to join <channel>.  <channel> is only necessary
        if the message isn't sent in the channel itself.
        """
        networkGroup = conf.supybot.networks.get(irc.network)
        networkGroup.channels.key.get(channel).setValue(key)
        if key:
            self._sendMsg(irc, ircmsgs.mode(channel, ['+k', key]))
        else:
            self._sendMsg(irc, ircmsgs.mode(channel, ['-k']))
    key = wrap(key, ['op', ('haveOp', 'change the keyword'),
                     additional('somethingWithoutSpaces', '')])

    def op(self, irc, msg, args, channel, nicks):
        """[<channel>] [<nick> ...]

        If you have the #channel,op capability, this will give all the <nick>s
        you provide ops.  If you don't provide any <nick>s, this will op you.
        <channel> is only necessary if the message isn't sent in the channel
        itself.
        """
        if not nicks:
            nicks = [msg.nick]
        self._sendMsg(irc, ircmsgs.ops(channel, nicks))
    op = wrap(op, ['op', ('haveOp', 'op someone'), any('nickInChannel')])

    def halfop(self, irc, msg, args, channel, nicks):
        """[<channel>] [<nick> ...]

        If you have the #channel,halfop capability, this will give all the
        <nick>s you provide halfops.  If you don't provide any <nick>s, this
        will give you halfops. <channel> is only necessary if the message isn't
        sent in the channel itself.
        """
        if not nicks:
            nicks = [msg.nick]
        self._sendMsg(irc, ircmsgs.halfops(channel, nicks))
    halfop = wrap(halfop, ['halfop', ('haveOp', 'halfop someone'),
                           any('nickInChannel')])

    def voice(self, irc, msg, args, channel, nicks):
        """[<channel>] [<nick> ...]

        If you have the #channel,voice capability, this will voice all the
        <nick>s you provide.  If you don't provide any <nick>s, this will
        voice you. <channel> is only necessary if the message isn't sent in the
        channel itself.
        """
        if nicks:
            if len(nicks) == 1 and msg.nick in nicks:
                capability = 'voice'
            else:
                capability = 'op'
        else:
            nicks = [msg.nick]
            capability = 'voice'
        capability = ircdb.makeChannelCapability(channel, capability)
        if ircdb.checkCapability(msg.prefix, capability):
            self._sendMsg(irc, ircmsgs.voices(channel, nicks))
        else:
            irc.errorNoCapability(capability)
    voice = wrap(voice, ['channel', ('haveOp', 'voice someone'),
                         any('nickInChannel')])

    def deop(self, irc, msg, args, channel, nicks):
        """[<channel>] [<nick> ...]

        If you have the #channel,op capability, this will remove operator
        privileges from all the nicks given.  If no nicks are given, removes
        operator privileges from the person sending the message.
        """
        if irc.nick in nicks:
            irc.error('I cowardly refuse to deop myself.  If you really want '
                      'me deopped, tell me to op you and then deop me '
                      'yourself.', Raise=True)
        if not nicks:
            nicks = [msg.nick]
        self._sendMsg(irc, ircmsgs.deops(channel, nicks))
    deop = wrap(deop, ['op', ('haveOp', 'deop someone'),
                       any('nickInChannel')])

    def dehalfop(self, irc, msg, args, channel, nicks):
        """[<channel>] [<nick> ...]

        If you have the #channel,op capability, this will remove half-operator
        privileges from all the nicks given.  If no nicks are given, removes
        half-operator privileges from the person sending the message.
        """
        if irc.nick in nicks:
            irc.error('I cowardly refuse to dehalfop myself.  If you really '
                      'want me dehalfopped, tell me to op you and then '
                      'dehalfop me yourself.', Raise=True)
        if not nicks:
            nicks = [msg.nick]
        self._sendMsg(irc, ircmsgs.dehalfops(channel, nicks))
    dehalfop = wrap(dehalfop, ['halfop', ('haveOp', 'dehalfop someone'),
                               any('nickInChannel')])

    # XXX We should respect the MODES part of an 005 here.  Helper function
    #     material.
    def devoice(self, irc, msg, args, channel, nicks):
        """[<channel>] [<nick> ...]

        If you have the #channel,op capability, this will remove voice from all
        the nicks given.  If no nicks are given, removes voice from the person
        sending the message.
        """
        if irc.nick in nicks:
            irc.error('I cowardly refuse to devoice myself.  If you really '
                      'want me devoiced, tell me to op you and then devoice '
                      'me yourself.', Raise=True)
        if not nicks:
            nicks = [msg.nick]
        self._sendMsg(irc, ircmsgs.devoices(channel, nicks))
    devoice = wrap(devoice, ['voice', ('haveOp', 'devoice someone'),
                             any('nickInChannel')])

    def cycle(self, irc, msg, args, channel):
        """[<channel>]

        If you have the #channel,op capability, this will cause the bot to
        "cycle", or PART and then JOIN the channel. <channel> is only necessary
        if the message isn't sent in the channel itself.
        """
        self._sendMsg(irc, ircmsgs.part(channel, msg.nick))
        networkGroup = conf.supybot.networks.get(irc.network)
        self._sendMsg(irc, networkGroup.channels.join(channel))
    cycle = wrap(cycle, ['op'])

    def kick(self, irc, msg, args, channel, nick, reason):
        """[<channel>] <nick> [<reason>]

        Kicks <nick> from <channel> for <reason>.  If <reason> isn't given,
        uses the nick of the person making the command as the reason.
        <channel> is only necessary if the message isn't sent in the channel
        itself.
        """
        if ircutils.strEqual(nick, irc.nick):
            irc.error('I cowardly refuse to kick myself.', Raise=True)
        if not reason:
            reason = msg.nick
        kicklen = irc.state.supported.get('kicklen', sys.maxint)
        if len(reason) > kicklen:
            irc.error('The reason you gave is longer than the allowed '
                      'length for a KICK reason on this server.')
            return
        self._sendMsg(irc, ircmsgs.kick(channel, nick, reason))
    kick = wrap(kick, ['op', ('haveOp', 'kick someone'),
                       'nickInChannel', additional('text')])

    def kban(self, irc, msg, args,
             channel, optlist, bannedNick, expiry, reason):
        """[<channel>] [--{exact,nick,user,host}] <nick> [<seconds>] [<reason>]

        If you have the #channel,op capability, this will kickban <nick> for
        as many seconds as you specify, or else (if you specify 0 seconds or
        don't specify a number of seconds) it will ban the person indefinitely.
        --exact bans only the exact hostmask; --nick bans just the nick;
        --user bans just the user, and --host bans just the host.  You can
        combine these options as you choose.  <reason> is a reason to give for
        the kick.
        <channel> is only necessary if the message isn't sent in the channel
        itself.
        """
        # Check that they're not trying to make us kickban ourself.
        self.log.debug('In kban')
        if not irc.isNick(bannedNick):
            self.log.warning('%q tried to kban a non nick: %q',
                             msg.prefix, bannedNick)
            raise callbacks.ArgumentError
        elif bannedNick == irc.nick:
            self.log.warning('%q tried to make me kban myself.', msg.prefix)
            irc.error('I cowardly refuse to kickban myself.')
            return
        if not reason:
            reason = msg.nick
        try:
            bannedHostmask = irc.state.nickToHostmask(bannedNick)
        except KeyError:
            irc.error(format('I haven\'t seen %s.', bannedNick), Raise=True)
        capability = ircdb.makeChannelCapability(channel, 'op')
        def makeBanmask(bannedHostmask, options):
            (nick, user, host) = ircutils.splitHostmask(bannedHostmask)
            self.log.debug('*** nick: %s' % nick)
            self.log.debug('*** user: %s' % user)
            self.log.debug('*** host: %s' % host)
            bnick = '*'
            buser = '*'
            bhost = '*'
            for option in options:
                if option == 'nick':
                    bnick = nick
                elif option == 'user':
                    buser = user
                elif option == 'host':
                    bhost = host
                elif option == 'exact':
                    (bnick, buser, bhost) = \
                                   ircutils.splitHostmask(bannedHostmask)
            return ircutils.joinHostmask(bnick, buser, bhost)
        if optlist:
            banmask = makeBanmask(bannedHostmask, [o[0] for o in optlist])
        else:
            banmask = makeBanmask(bannedHostmask,
                                  self.registryValue('banmask', channel))
        # Check (again) that they're not trying to make us kickban ourself.
        if ircutils.hostmaskPatternEqual(banmask, irc.prefix):
            if ircutils.hostmaskPatternEqual(banmask, irc.prefix):
                self.log.warning('%q tried to make me kban myself.',msg.prefix)
                irc.error('I cowardly refuse to ban myself.')
                return
            else:
                banmask = bannedHostmask
        # Now, let's actually get to it.  Check to make sure they have
        # #channel,op and the bannee doesn't have #channel,op; or that the
        # bannee and the banner are both the same person.
        def doBan():
            if irc.state.channels[channel].isOp(bannedNick):
                irc.queueMsg(ircmsgs.deop(channel, bannedNick))
            irc.queueMsg(ircmsgs.ban(channel, banmask))
            irc.queueMsg(ircmsgs.kick(channel, bannedNick, reason))
            if expiry > 0:
                def f():
                    if channel in irc.state.channels and \
                       banmask in irc.state.channels[channel].bans:
                        irc.queueMsg(ircmsgs.unban(channel, banmask))
                schedule.addEvent(f, expiry)
        if bannedNick == msg.nick:
            doBan()
        elif ircdb.checkCapability(msg.prefix, capability):
            if ircdb.checkCapability(bannedHostmask, capability):
                self.log.warning('%s tried to ban %q, but both have %s',
                                 msg.prefix, bannedHostmask, capability)
                irc.error(format('%s has %s too, you can\'t ban him/her/it.',
                                 bannedNick, capability))
            else:
                doBan()
        else:
            self.log.warning('%q attempted kban without %s',
                             msg.prefix, capability)
            irc.errorNoCapability(capability)
            exact,nick,user,host
    kban = wrap(kban,
                ['op',
                 getopts({'exact':'', 'nick':'', 'user':'', 'host':''}),
                 ('haveOp', 'kick or ban someone'),
                 'nickInChannel',
                 optional('expiry', 0),
                 additional('text')])

    def unban(self, irc, msg, args, channel, hostmask):
        """[<channel>] [<hostmask>]

        Unbans <hostmask> on <channel>.  If <hostmask> is not given, unbans
        any hostmask currently banned on <channel> that matches your current
        hostmask.  Especially useful for unbanning yourself when you get
        unexpectedly (or accidentally) banned from the channel.  <channel> is
        only necessary if the message isn't sent in the channel itself.
        """
        if hostmask:
            self._sendMsg(irc, ircmsgs.unban(channel, hostmask))
        else:
            bans = []
            for banmask in irc.state.channels[channel].bans:
                if ircutils.hostmaskPatternEqual(banmask, msg.prefix):
                    bans.append(banmask)
            if bans:
                irc.queueMsg(ircmsgs.unbans(channel, bans))
                irc.replySuccess(format('All bans on %s matching %s '
                                        'have been removed.',
                                        channel, msg.prefix))
            else:
                irc.error('No bans matching %s were found on %s.' %
                          (msg.prefix, channel))
    unban = wrap(unban, ['op',
                         ('haveOp', 'unban someone'),
                         additional('hostmask')])

    def invite(self, irc, msg, args, channel, nick):
        """[<channel>] <nick>

        If you have the #channel,op capability, this will invite <nick>
        to join <channel>. <channel> is only necessary if the message isn't
        sent in the channel itself.
        """
        nick = nick or msg.nick
        self._sendMsg(irc, ircmsgs.invite(nick, channel))
        self.invites[(irc.getRealIrc(), ircutils.toLower(nick))] = irc
    invite = wrap(invite, ['op', ('haveOp', 'invite someone'),
                           additional('nick')])

    def do341(self, irc, msg):
        (_, nick, channel) = msg.args
        nick = ircutils.toLower(nick)
        replyIrc = self.invites.pop((irc, nick), None)
        if replyIrc is not None:
            self.log.info('Inviting %s to %s by command of %s.',
                          nick, channel, replyIrc.msg.prefix)
            replyIrc.replySuccess()
        else:
            self.log.info('Inviting %s to %s.', nick, channel)

    def do443(self, irc, msg):
        (_, nick, channel, _) = msg.args
        nick = ircutils.toLower(nick)
        replyIrc = self.invites.pop((irc, nick), None)
        if replyIrc is not None:
            replyIrc.error(format('%s is already in %s.', nick, channel))

    def do401(self, irc, msg):
        nick = msg.args[1]
        nick = ircutils.toLower(nick)
        replyIrc = self.invites.pop((irc, nick), None)
        if replyIrc is not None:
            replyIrc.error(format('There is no %s on this network.', nick))

    def do504(self, irc, msg):
        nick = msg.args[1]
        nick = ircutils.toLower(nick)
        replyIrc = self.invites.pop((irc, nick), None)
        if replyirc is not None:
            replyIrc.error(format('There is no %s on this server.', nick))

    class lobotomy(callbacks.Commands):
        def add(self, irc, msg, args, channel):
            """[<channel>]

            If you have the #channel,op capability, this will "lobotomize" the
            bot, making it silent and unanswering to all requests made in the
            channel. <channel> is only necessary if the message isn't sent in
            the channel itself.
            """
            c = ircdb.channels.getChannel(channel)
            c.lobotomized = True
            ircdb.channels.setChannel(channel, c)
            irc.replySuccess()
        add = wrap(add, ['op'])

        def remove(self, irc, msg, args, channel):
            """[<channel>]

            If you have the #channel,op capability, this will unlobotomize the
            bot, making it respond to requests made in the channel again.
            <channel> is only necessary if the message isn't sent in the channel
            itself.
            """
            c = ircdb.channels.getChannel(channel)
            c.lobotomized = False
            ircdb.channels.setChannel(channel, c)
            irc.replySuccess()
        remove = wrap(remove, ['op'])

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

            Returns the channels in which this bot is lobotomized.
            """
            L = []
            for (channel, c) in ircdb.channels.iteritems():
                if c.lobotomized:
                    chancap = ircdb.makeChannelCapability(channel, 'op')
                    if ircdb.checkCapability(msg.prefix, 'admin') or \
                       ircdb.checkCapability(msg.prefix, chancap) or \
                       (channel in irc.state.channels and \
                        msg.nick in irc.state.channels[channel].users):
                        L.append(channel)
            if L:
                L.sort()
                s = format('I\'m currently lobotomized in %L.', L)
                irc.reply(s)
            else:
                irc.reply('I\'m not currently lobotomized in any channels '
                          'that you\'re in.')
        list = wrap(list)

    class ban(callbacks.Commands):
        def add(self, irc, msg, args, channel, banmask, expires):
            """[<channel>] <nick|hostmask> [<expires>]

            If you have the #channel,op capability, this will effect a
            persistent ban from interacting with the bot on the given
            <hostmask> (or the current hostmask associated with <nick>.  Other
            plugins may enforce this ban by actually banning users with
            matching hostmasks when they join.  <expires> is an optional
            argument specifying when (in "seconds from now") the ban should
            expire; if none is given, the ban will never automatically expire.
            <channel> is only necessary if the message isn't sent in the
            channel itself.
            """
            c = ircdb.channels.getChannel(channel)
            c.addBan(banmask, expires)
            ircdb.channels.setChannel(channel, c)
            irc.replySuccess()
        add = wrap(add, ['op', 'hostmask', additional('expiry', 0)])

        def remove(self, irc, msg, args, channel, banmask):
            """[<channel>] <hostmask>

            If you have the #channel,op capability, this will remove the
            persistent ban on <hostmask>.  <channel> is only necessary if the
            message isn't sent in the channel itself.
            """
            c = ircdb.channels.getChannel(channel)
            c.removeBan(banmask)
            ircdb.channels.setChannel(channel, c)
            irc.replySuccess()
        remove = wrap(remove, ['op', 'hostmask'])

        def list(self, irc, msg, args, channel):
            """[<channel>]

            If you have the #channel,op capability, this will show you the
            current bans on #channel.
            """
            # XXX Add the expirations.
            c = ircdb.channels.getChannel(channel)
            if c.bans:
                irc.reply(format('%L', map(utils.str.dqrepr, c.bans)))
            else:
                irc.reply(format('There are no persistent bans on %s.',
                                 channel))
        list = wrap(list, ['op'])

    class ignore(callbacks.Commands):
        def add(self, irc, msg, args, channel, banmask, expires):
            """[<channel>] <nick|hostmask> [<expires>]

            If you have the #channel,op capability, this will set a persistent
            ignore on <hostmask> or the hostmask currently
            associated with <nick>. <expires> is an optional argument
            specifying when (in "seconds from now") the ignore will expire; if
            it isn't given, the ignore will never automatically expire.
            <channel> is only necessary if the message isn't sent in the
            channel itself.
            """
            c = ircdb.channels.getChannel(channel)
            c.addIgnore(banmask, expires)
            ircdb.channels.setChannel(channel, c)
            irc.replySuccess()
        add = wrap(add, ['op', 'hostmask', additional('expiry', 0)])

        def remove(self, irc, msg, args, channel, banmask):
            """[<channel>] <hostmask>

            If you have the #channel,op capability, this will remove the
            persistent ignore on <hostmask> in the channel. <channel> is only
            necessary if the message isn't sent in the channel itself.
            """
            c = ircdb.channels.getChannel(channel)
            c.removeIgnore(banmask)
            ircdb.channels.setChannel(channel, c)
            irc.replySuccess()
        remove = wrap(remove, ['op', 'hostmask'])

        def list(self, irc, msg, args, channel):
            """[<channel>]

            Lists the hostmasks that the bot is ignoring on the given channel.
            <channel> is only necessary if the message isn't sent in the
            channel itself.
            """
            # XXX Add the expirations.
            c = ircdb.channels.getChannel(channel)
            if len(c.ignores) == 0:
                s = format('I\'m not currently ignoring any hostmasks in %q',
                           channel)
                irc.reply(s)
            else:
                L = sorted(c.ignores)
                irc.reply(utils.str.commaAndify(map(repr, L)))
        list = wrap(list, ['op'])

    class capability(callbacks.Commands):
        def add(self, irc, msg, args, channel, user, capabilities):
            """[<channel>] <nick|username> <capability> [<capability> ...]

            If you have the #channel,op capability, this will give the user
            <name> (or the user to whom <nick> maps)
            the capability <capability> in the channel. <channel> is only
            necessary if the message isn't sent in the channel itself.
            """
            for c in capabilities.split():
                c = ircdb.makeChannelCapability(channel, c)
                user.addCapability(c)
            ircdb.users.setUser(user)
            irc.replySuccess()
        add = wrap(add, ['op', 'otherUser', 'capability'])

        def remove(self, irc, msg, args, channel, user, capabilities):
            """[<channel>] <name|hostmask> <capability> [<capability> ...]

            If you have the #channel,op capability, this will take from the
            user currently identified as <name> (or the user to whom <hostmask>
            maps) the capability <capability> in the channel. <channel> is only
            necessary if the message isn't sent in the channel itself.
            """
            fail = []
            for c in capabilities.split():
                cap = ircdb.makeChannelCapability(channel, c)
                try:
                    user.removeCapability(cap)
                except KeyError:
                    fail.append(c)
            ircdb.users.setUser(user)
            if fail:
                s = 'capability'
                if len(fail) > 1:
                    s = utils.str.pluralize(s)
                irc.error(format('That user didn\'t have the %L %s.', fail, s),
                          Raise=True)
            irc.replySuccess()
        remove = wrap(remove, ['op', 'otherUser', 'capability'])

        # XXX This needs to be fix0red to be like Owner.defaultcapability.  Or
        # something else.  This is a horrible interface.
        def setdefault(self, irc, msg, args, channel, v):
            """[<channel>] {True|False}

            If you have the #channel,op capability, this will set the default
            response to non-power-related (that is, not {op, halfop, voice}
            capabilities to be the value you give. <channel> is only necessary
            if the message isn't sent in the channel itself.
            """
            c = ircdb.channels.getChannel(channel)
            if v:
                c.setDefaultCapability(True)
            else:
                c.setDefaultCapability(False)
            ircdb.channels.setChannel(channel, c)
            irc.replySuccess()
        setdefault = wrap(setdefault, ['op', 'boolean'])

        def set(self, irc, msg, args, channel, capabilities):
            """[<channel>] <capability> [<capability> ...]

            If you have the #channel,op capability, this will add the channel
            capability <capability> for all users in the channel. <channel> is
            only necessary if the message isn't sent in the channel itself.
            """
            chan = ircdb.channels.getChannel(channel)
            for c in capabilities:
                chan.addCapability(c)
            ircdb.channels.setChannel(channel, chan)
            irc.replySuccess()
        set = wrap(set, ['op', many('capability')])

        def unset(self, irc, msg, args, channel, capabilities):
            """[<channel>] <capability> [<capability> ...]

            If you have the #channel,op capability, this will unset the channel
            capability <capability> so each user's specific capability or the
            channel default capability will take precedence. <channel> is only
            necessary if the message isn't sent in the channel itself.
            """
            chan = ircdb.channels.getChannel(channel)
            fail = []
            for c in capabilities:
                try:
                    chan.removeCapability(c)
                except KeyError:
                    fail.append(c)
            ircdb.channels.setChannel(channel, chan)
            if fail:
                s = 'capability'
                if len(fail) > 1:
                    s = utils.str.pluralize(s)
                irc.error(format('I do not know about the %L %s.', fail, s),
                          Raise=True)
            irc.replySuccess()
        unset = wrap(unset, ['op', many('capability')])

        def list(self, irc, msg, args, channel):
            """[<channel>]

            Returns the capabilities present on the <channel>. <channel> is
            only necessary if the message isn't sent in the channel itself.
            """
            c = ircdb.channels.getChannel(channel)
            L = sorted(c.capabilities)
            irc.reply(' '.join(L))
        list = wrap(list, ['channel'])

    def disable(self, irc, msg, args, channel, plugin, command):
        """[<channel>] [<plugin>] [<command>]

        If you have the #channel,op capability, this will disable the <command>
        in <channel>.  If <plugin> is provided, <command> will be disabled only
        for that plugin.  If only <plugin> is provided, all commands in the
        given plugin will be disabled.  <channel> is only necessary if the
        message isn't sent in the channel itself.
        """
        chan = ircdb.channels.getChannel(channel)
        failMsg = ''
        if plugin:
            s = '-%s' % plugin.name()
            if command:
                if plugin.isCommand(command):
                    s = '-%s.%s' % (plugin.name(), command)
                else:
                    failMsg = format('The %s plugin does not have a command '
                                     'called %s.', plugin.name(), command)
        elif command:
            # findCallbackForCommand
            if irc.findCallbackForCommand(command):
                s = '-%s' % command
            else:
                failMsg = format('No plugin or command named %s could be '
                                 'found.', command)
        else:
            raise callbacks.ArgumentError
        if failMsg:
            irc.error(failMsg)
        else:
            chan.addCapability(s)
            ircdb.channels.setChannel(channel, chan)
            irc.replySuccess()
    disable = wrap(disable, ['op',
                             optional(('plugin', False)),
                             additional('commandName')])

    def enable(self, irc, msg, args, channel, plugin, command):
        """[<channel>] [<plugin>] [<command>]

        If you have the #channel,op capability, this will enable the <command>
        in <channel> if it has been disabled.  If <plugin> is provided,
        <command> will be enabled only for that plugin.  If only <plugin> is
        provided, all commands in the given plugin will be enabled.  <channel>
        is only necessary if the message isn't sent in the channel itself.
        """
        chan = ircdb.channels.getChannel(channel)
        failMsg = ''
        if plugin:
            s = '-%s' % plugin.name()
            if command:
                if plugin.isCommand(command):
                    s = '-%s.%s' % (plugin.name(), command)
                else:
                    failMsg = format('The %s plugin does not have a command '
                                     'called %s.', plugin.name(), command)
        elif command:
            # findCallbackForCommand
            if irc.findCallbackForCommand(command):
                s = '-%s' % command
            else:
                failMsg = format('No plugin or command named %s could be '
                                 'found.', command)
        else:
            raise callbacks.ArgumentError
        if failMsg:
            irc.error(failMsg)
        else:
            fail = []
            try:
                chan.removeCapability(s)
            except KeyError:
                fail.append(s)
            ircdb.channels.setChannel(channel, chan)
            if fail:
                irc.error(format('%s was not disabled.', s[1:]))
            else:
                irc.replySuccess()
    enable = wrap(enable, ['op',
                           optional(('plugin', False)),
                           additional('commandName')])

    def nicks(self, irc, msg, args, channel):
        """[<channel>]

        Returns the nicks in <channel>.  <channel> is only necessary if the
        message isn't sent in the channel itself.
        """
        L = list(irc.state.channels[channel].users)
        utils.sortBy(str.lower, L)
        irc.reply(utils.str.commaAndify(L))
    nicks = wrap(nicks, ['inChannel']) # XXX Check that the caller is in chan.

    def alertOps(self, irc, channel, s, frm=None):
        """Internal message for notifying all the #channel,ops in a channel of
        a given situation."""
        capability = ircdb.makeChannelCapability(channel, 'op')
        s = format('Alert to all %s ops: %s', channel, s)
        if frm is not None:
            s += format(' (from %s)', frm)
        for nick in irc.state.channels[channel].users:
            hostmask = irc.state.nickToHostmask(nick)
            if ircdb.checkCapability(hostmask, capability):
                irc.reply(s, to=nick, private=True)

    def alert(self, irc, msg, args, channel, text):
        """[<channel>] <text>

        Sends <text> to all the users in <channel> who have the <channel>,op
        capability.
        """
        self.alertOps(irc, channel, text, frm=msg.nick)
    alert = wrap(alert, ['op', 'text'])


Class = Channel

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