Limnoria/plugins/MoobotFactoids.py

###
# Copyright (c) 2003, Daniel DiPaolo
# 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.
###

"""
Moobot factoid compatibility module.  Moobot's factoids were originally
designed to emulate Blootbot's factoids, so in either case, you should find
this plugin comfortable.
"""

import supybot

__revision__="$Id$"
__author__ = supybot.authors.strike

import supybot.plugins as plugins

import os
import sets
import time
import shlex
import string
import random
from itertools import imap
from cStringIO import StringIO

import supybot.registry as registry

import supybot.conf as conf
import supybot.ircdb as ircdb
import supybot.utils as utils
import supybot.ircmsgs as ircmsgs
import supybot.ircutils as ircutils
import supybot.privmsgs as privmsgs
import supybot.callbacks as callbacks

import supybot.Owner as Owner

allchars = string.maketrans('', '')
class OptionList(object):
    validChars = allchars.translate(allchars, '|()')
    def _insideParens(self, lexer):
        ret = []
        while True:
            token = lexer.get_token()
            if not token:
                return '(%s' % ''.join(ret) #)
            elif token == ')':
                if len(ret) > 1:
                    if '|' in ret:
                        L = map(''.join,
                                utils.itersplit('|'.__eq__, ret,
                                                yieldEmpty=True))
                        return random.choice(L)
                    else:
                        return ''.join(ret)
                    return [x for x in ret if x != '|']
                elif len(ret) == 1:
                        return '(%s)' % ret[0]
                else:
                    return '()'
            elif token == '(':
                ret.append(self._insideParens(lexer))
            elif token == '|':
                ret.append(token)
            else:
                ret.append(token)

    def tokenize(self, s):
        lexer = shlex.shlex(StringIO(s))
        lexer.commenters = ''
        lexer.quotes = ''
        lexer.whitespace = ''
        lexer.wordchars = self.validChars
        ret = []
        while True:
            token = lexer.get_token()
            if not token:
                break
            elif token == '(':
                ret.append(self._insideParens(lexer))
            else:
                ret.append(token)
        return ''.join(ret)

def pickOptions(s):
    return OptionList().tokenize(s)

conf.registerPlugin('MoobotFactoids')
conf.registerChannelValue(conf.supybot.plugins.MoobotFactoids,
    'showFactoidIfOnlyOneMatch', registry.Boolean(True, """Determines whether
    or not the factoid value will be shown when a listkeys search returns only
    one factoid key."""))
conf.registerChannelValue(conf.supybot.plugins.MoobotFactoids,
    'mostCount', registry.Integer(10, """Determines how many items are shown
    when the 'most' command is called."""))

class SqliteMoobotDB(object):
    def __init__(self, filename):
        self.filename = filename
    def _getDb(self, channel):
        try:
            import sqlite
        except ImportError:
            raise callbacks.Error, \
                  'You need to have PySQLite installed to use this ' \
                  'plugin.  Download it at <http://pysqlite.sf.net/>'
        filename = plugins.makeChannelFilename(self.filename, channel)
        if os.path.exists(filename):
            db = sqlite.connect(filename)
        else:
            db = sqlite.connect(filename)
            cursor = db.cursor()
            cursor.execute("""CREATE TABLE factoids (
                              key TEXT PRIMARY KEY,
                              created_by INTEGER,
                              created_at TIMESTAMP,
                              modified_by INTEGER,
                              modified_at TIMESTAMP,
                              locked_at TIMESTAMP,
                              locked_by INTEGER,
                              last_requested_by TEXT,
                              last_requested_at TIMESTAMP,
                              fact TEXT,
                              requested_count INTEGER
                              )""")
            db.commit()
        return db

    def getFactoid(self, channel, key):
        db = self._getDb(channel)
        cursor = db.cursor()
        cursor.execute("""SELECT fact FROM factoids
                          WHERE key LIKE %s""", key)
        if cursor.rowcount == 0:
            return None
        else:
            return cursor.fetchall()[0]

    def getFactinfo(self, channel, key):
        db = self._getDb(channel)
        cursor = db.cursor()
        cursor.execute("""SELECT created_by, created_at,
                                 modified_by, modified_at,
                                 last_requested_by, last_requested_at,
                                 requested_count, locked_by, locked_at
                          FROM factoids
                          WHERE key LIKE %s""", key)
        if cursor.rowcount == 0:
            return None
        else:
            return cursor.fetchone()

    def randomFactoid(self, channel):
        db = self._getDb(channel)
        cursor = db.cursor()
        cursor.execute("""SELECT fact, key FROM factoids
                          ORDER BY random() LIMIT 1""")
        if cursor.rowcount == 0:
            return None
        else:
            return cursor.fetchone()

    def addFactoid(self, channel, key, value, creator_id):
        db = self._getDb(channel)
        cursor = db.cursor()
        cursor.execute("""INSERT INTO factoids VALUES
                          (%s, %s, %s, NULL, NULL, NULL, NULL,
                           NULL, NULL, %s, 0)""",
                           key, creator_id, int(time.time()), value)
        db.commit()

    def updateFactoid(self, channel, key, newvalue, modifier_id):
        db = self._getDb(channel)
        cursor = db.cursor()
        cursor.execute("""UPDATE factoids
                          SET fact=%s, modified_by=%s,
                          modified_at=%s WHERE key LIKE %s""",
                          newvalue, modifier_id, int(time.time()), key)
        db.commit()

    def updateRequest(self, channel, key, hostmask):
        db = self._getDb(channel)
        cursor = db.cursor()
        cursor.execute("""UPDATE factoids SET
                          last_requested_by = %s,
                          last_requested_at = %s,
                          requested_count = requested_count + 1
                          WHERE key = %s""",
                          hostmask, int(time.time()), key)
        db.commit()

    def removeFactoid(self, channel, key):
        db = self._getDb(channel)
        cursor = db.cursor()
        cursor.execute("""DELETE FROM factoids WHERE key LIKE %s""",
                          key)
        db.commit()

    def locked(self, channel, key):
        db = self._getDb(channel)
        cursor = db.cursor()
        cursor.execute ("""SELECT locked_by FROM factoids
                           WHERE key LIKE %s""", key)
        if cursor.fetchone()[0] is None:
            return False
        else:
            return True

    def lock(self, channel, key, locker_id):
        db = self._getDb(channel)
        cursor = db.cursor()
        cursor.execute("""UPDATE factoids
                          SET locked_by=%s, locked_at=%s
                          WHERE key LIKE %s""",
                          locker_id, int(time.time()), key)
        db.commit()

    def unlock(self, channel, key):
        db = self._getDb(channel)
        cursor = db.cursor()
        cursor.execute("""UPDATE factoids
                          SET locked_by=%s, locked_at=%s
                          WHERE key LIKE %s""", None, None, key)
        db.commit()

    def mostAuthored(self, channel, limit):
        db = self._getDb(channel)
        cursor = db.cursor()
        cursor.execute("""SELECT created_by, count(key) FROM factoids
                          GROUP BY created_by
                          ORDER BY count(key) DESC LIMIT %s""", limit)
        return cursor.fetchall()

    def mostRecent(self, channel, limit):
        db = self._getDb(channel)
        cursor = db.cursor()
        cursor.execute("""SELECT key FROM factoids
                          ORDER BY created_at DESC LIMIT %s""", limit)
        return cursor.fetchall()

    def mostPopular(self, channel, limit):
        db = self._getDb(channel)
        cursor = db.cursor()
        cursor.execute("""SELECT key, requested_count FROM factoids
                          WHERE requested_count > 0
                          ORDER BY requested_count DESC LIMIT %s""", limit)
        if cursor.rowcount == 0:
            return []
        else:
            return cursor.fetchall()

    def getKeysByAuthor(self, channel, authorId):
        db = self._getDb(channel)
        cursor = db.cursor()
        cursor.execute("""SELECT key FROM factoids WHERE created_by=%s
                          ORDER BY key""", authorId)
        if cursor.rowcount == 0:
            return []
        else:
            return cursor.fetchall()

    def getKeysByGlob(self, channel, glob):
        db = self._getDb(channel)
        cursor = db.cursor()
        cursor.execute("""SELECT key FROM factoids WHERE key LIKE %s
                          ORDER BY key""", glob)
        if cursor.rowcount == 0:
            return []
        else:
            return cursor.fetchall()

    def getKeysByValueGlob(self, channel, glob):
        db = self._getDb(channel)
        cursor = db.cursor()
        cursor.execute("""SELECT key FROM factoids WHERE fact LIKE %s
                          ORDER BY key""", glob)
        if cursor.rowcount == 0:
            return []
        else:
            return cursor.fetchall()

MoobotDB = plugins.DB('MoobotFactoids', {'sqlite': SqliteMoobotDB})

## We define our own getChannel so we can set raiseError=False in one place.
# Actually, we'll go ahead and raise the error and say that everything must be
# in channel. The smart users will know that they can specify the channel name
# for certain commands.
def getChannel(irc, msg, args=()):
    try:
        return privmsgs.getChannel(msg, args)
    except callbacks.Error:
        irc.error('Command must be sent in a channel.', Raise=True)

class MoobotFactoids(callbacks.Privmsg):
    callBefore = ['Dunno']
    def __init__(self):
        self.db = MoobotDB()
        super(MoobotFactoids, self).__init__()

    _replyTag = '<reply>'
    _actionTag = '<action>'
    def _parseFactoid(self, irc, msg, fact):
        type = 'define'  # Default is to just spit the factoid back as a
                         # definition of what the key is (i.e., "foo is bar")
        newfact = pickOptions(fact)
        if newfact.startswith(self._replyTag):
            newfact = newfact[len(self._replyTag):]
            type = 'reply'
        elif newfact.startswith(self._actionTag):
            newfact = newfact[len(self._actionTag):]
            type = 'action'
        newfact = newfact.strip()
        newfact = plugins.standardSubstitute(irc, msg, newfact)
        return (type, newfact)

    def tokenizedCommand(self, irc, msg, tokens):
        if '=~' in tokens:
            self.changeFactoid(irc, msg, tokens)
        elif tokens and tokens[0] in ('no', 'no,'):
            self.replaceFactoid(irc, msg, tokens)
        elif ['is', 'also'] in window(tokens, 2):
            self.augmentFactoid(irc, msg, tokens)
        else:
            key = ' '.join(tokens)
            key = self._sanitizeKey(key)
            channel = getChannel(irc, msg)
            fact = self.db.getFactoid(channel, key)
            if fact:
                self.db.updateRequest(channel, key, msg.prefix)
                # getFactoid returns "all results", so we need to extract the
                # first one.
                fact = fact[0]
                # Update the requested count/requested by for this key
                hostmask = msg.prefix
                # Now actually get the factoid and respond accordingly
                (type, text) = self._parseFactoid(irc, msg, fact)
                if type == 'action':
                    irc.reply(text, action=True)
                elif type == 'reply':
                    irc.reply(text, prefixName=False)
                elif type == 'define':
                    irc.reply('%s is %s' % (key, text), prefixName=False)
                else:
                    assert False, 'Spurious type from _parseFactoid'
            else:
                if 'is' in tokens or '_is_' in tokens:
                    self.addFactoid(irc, msg, tokens)

    def _getUserId(self, irc, prefix):
        try:
            return ircdb.users.getUserId(prefix)
        except KeyError:
            irc.errorNotRegistered(Raise=True)

    def _sanitizeKey(self, key):
        return key.rstrip('!? ')

    def _checkNotLocked(self, irc, channel, key):
        if self.db.locked(channel, key):
            irc.error('Factoid "%s" is locked.' % key, Raise=True)

    def _getFactoid(self, irc, channel, key):
        fact = self.db.getFactoid(channel, key)
        if fact is not None:
            return fact
        else:
            irc.error('Factoid "%s" not found.' % key, Raise=True)

    def _getKeyAndFactoid(self, tokens):
        if '_is_' in tokens:
            p = '_is_'.__eq__
        elif 'is' in tokens:
            p = 'is'.__eq__
        else:
            s = 'Invalid tokens for {add,change}Factoid: %s' % \
                utils.quoted(tokens)
            raise ValueError, s
        (key, newfact) = map(' '.join, utils.itersplit(p, tokens, maxsplit=1))
        key = self._sanitizeKey(key)
        return (key, newfact)

    def addFactoid(self, irc, msg, tokens):
        # First, check and see if the entire message matches a factoid key
        channel = getChannel(irc, msg)
        id = self._getUserId(irc, msg.prefix)
        (key, fact) = self._getKeyAndFactoid(tokens)
        # Check and make sure it's not in the DB already
        if self.db.getFactoid(channel, key):
            irc.error('Factoid "%s" already exists.' % key, Raise=True)
        self.db.addFactoid(channel, key, fact, id)
        irc.replySuccess()

    def changeFactoid(self, irc, msg, tokens):
        id = self._getUserId(irc, msg.prefix)
        (key, regexp) = map(' '.join,
                            utils.itersplit('=~'.__eq__, tokens, maxsplit=1))
        channel = getChannel(irc, msg)
        # Check and make sure it's in the DB
        fact = self._getFactoid(irc, channel, key)
        self._checkNotLocked(irc, channel, key)
        # It's fair game if we get to here
        try:
            r = utils.perlReToReplacer(regexp)
        except ValueError, e:
            irc.errorInvalid('regexp', regexp, Raise=True)
        fact = fact[0]
        new_fact = r(fact)
        self.db.updateFactoid(channel, key, new_fact, id)
        irc.replySuccess()

    def augmentFactoid(self, irc, msg, tokens):
        # Must be registered!
        id = self._getUserId(irc, msg.prefix)
        pairs = list(window(tokens, 2))
        isAlso = pairs.index(['is', 'also'])
        key = ' '.join(tokens[:isAlso])
        new_text = ' '.join(tokens[isAlso+2:])
        channel = getChannel(irc, msg)
        fact = self._getFactoid(irc, channel, key)
        self._checkNotLocked(irc, channel, key)
        # It's fair game if we get to here
        fact = fact[0]
        new_fact = "%s, or %s" % (fact, new_text)
        self.db.updateFactoid(channel, key, new_fact, id)
        irc.replySuccess()

    def replaceFactoid(self, irc, msg, tokens):
        # Must be registered!
        channel = getChannel(irc, msg)
        id = self._getUserId(irc, msg.prefix)
        del tokens[0] # remove the "no,"
        (key, fact) = self._getKeyAndFactoid(tokens)
        _ = self._getFactoid(irc, channel, key)
        self._checkNotLocked(irc, channel, key)
        self.db.removeFactoid(channel, key)
        self.db.addFactoid(channel, key, fact, id)
        irc.replySuccess()

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

        Returns the literal factoid for the given factoid key.  No parsing of
        the factoid value is done as it is with normal retrieval.  <channel>
        is only necessary if the message isn't sent in the channel itself.
        """
        channel = getChannel(irc, msg, args)
        key = privmsgs.getArgs(args)
        fact = self._getFactoid(irc, channel, key)
        fact = fact[0]
        irc.reply(fact)

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

        Returns the various bits of info on the factoid for the given key.
        <channel> is only necessary if the message isn't sent in the channel
        itself.
        """
        channel = getChannel(irc, msg, args)
        key = privmsgs.getArgs(args)
        # Start building the response string
        s = key + ": "
        # Next, get all the info and build the response piece by piece
        info = self.db.getFactinfo(channel, key)
        if not info:
            irc.error('No such factoid: "%s"' % key)
            return
        (created_by, created_at, modified_by, modified_at, last_requested_by,
         last_requested_at, requested_count, locked_by, locked_at) = info
        # First, creation info.
        # Map the integer created_by to the username
        creat_by = ircdb.users.getUser(created_by).name
        creat_at = time.strftime(conf.supybot.humanTimestampFormat(),
                                 time.localtime(int(created_at)))
        s += "Created by %s on %s." % (creat_by, creat_at)
        # Next, modification info, if any.
        if modified_by is not None:
            mod_by = ircdb.users.getUser(modified_by).name
            mod_at = time.strftime(conf.supybot.humanTimestampFormat(),
                                   time.localtime(int(modified_at)))
            s += " Last modified by %s on %s." % (mod_by, mod_at)
        # Next, last requested info, if any
        if last_requested_by is not None:
            last_by = last_requested_by  # not an int user id
            last_at = time.strftime(conf.supybot.humanTimestampFormat(),
                                    time.localtime(int(last_requested_at)))
            req_count = requested_count
            times_str = utils.nItems('time', requested_count)
            s += " Last requested by %s on %s, requested %s." % \
                 (last_by, last_at, times_str)
        # Last, locked info
        if locked_at is not None:
            lock_at = time.strftime(conf.supybot.humanTimestampFormat(),
                                     time.localtime(int(locked_at)))
            lock_by = ircdb.users.getUser(locked_by).name
            s += " Locked by %s on %s." % (lock_by, lock_at)
        irc.reply(s)

    def _lock(self, irc, msg, args, locking=True):
        self.log.debug('in _lock')
        try:
            id = ircdb.users.getUserId(msg.prefix)
        except KeyError:
            irc.errorNotRegistered()
            return
        self.log.debug('id: %s' % id)
        channel = getChannel(irc, msg, args)
        key = privmsgs.getArgs(args)
        info = self.db.getFactinfo(channel, key)
        if not info:
            irc.error('No such factoid: "%s"' % key)
            return
        (created_by, _, _, _, _, _, _, locked_by, _) = info
        # Don't perform redundant operations
        if locking and locked_by is not None:
               irc.error('Factoid "%s" is already locked.' % key)
               return
        if not locking and locked_by is None:
               irc.error('Factoid "%s" is not locked.' % key)
               return
        # Can only lock/unlock own factoids unless you're an admin
        self.log.debug('admin?: %s' % ircdb.checkCapability(id, 'admin'))
        self.log.debug('created_by: %s' % created_by)
        if not (ircdb.checkCapability(id, 'admin') or created_by == id):
            if locking:
                s = "lock"
            else:
                s = "unlock"
            irc.error("Cannot %s someone else's factoid unless you "
                      "are an admin." % s)
            return
        # Okay, we're done, ready to lock/unlock
        if locking:
           self.db.lock(channel, key, id)
        else:
           self.db.unlock(channel, key)
        irc.replySuccess()

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

        Locks the factoid with the given factoid key.  Requires that the user
        be registered and have created the factoid originally.  <channel> is
        only necessary if the message isn't sent in the channel itself.
        """
        self._lock(irc, msg, args, True)

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

        Unlocks the factoid with the given factoid key.  Requires that the
        user be registered and have locked the factoid.  <channel> is only
        necessary if the message isn't sent in the channel itself.
        """
        self._lock(irc, msg, args, False)

    def most(self, irc, msg, args):
        """[<channel>] {popular|authored|recent}

        Lists the most {popular|authored|recent} factoids.  "popular" lists the
        most frequently requested factoids.  "authored" lists the author with
        the most factoids.  "recent" lists the most recently created factoids.
        <channel> is only necessary if the message isn't sent in the channel
        itself.
        """
        channel = getChannel(irc, msg, args)
        arg = privmsgs.getArgs(args)
        arg = arg.capitalize()
        method = getattr(self, '_most%s' % arg, None)
        if method is None:
            raise callbacks.ArgumentError
        limit = self.registryValue('mostCount', channel)
        method(irc, channel, limit)

    def _mostAuthored(self, irc, channel, limit):
        results = self.db.mostAuthored(channel, limit)
        L = ['%s (%s)' % (ircdb.users.getUser(t[0]).name, int(t[1]))
             for t in results]
        if L:
            irc.reply('Most prolific %s: %s' %
                      (utils.pluralize('author', len(L)),utils.commaAndify(L)))
        else:
            irc.error('There are no factoids in my database.')

    def _mostRecent(self, irc, channel, limit):
        results = self.db.mostRecent(channel, limit)
        L = ['"%s"' % t[0] for t in results]
        if L:
            irc.reply('%s: %s' %
                      (utils.nItems('factoid', len(L), between='latest'),
                       utils.commaAndify(L)))
        else:
            irc.error('There are no factoids in my database.')

    def _mostPopular(self, irc, channel, limit):
        results = self.db.mostPopular(channel, limit)
        L = ['"%s" (%s)' % (t[0], t[1]) for t in results]
        if L:
            irc.reply('Top %s: %s' %
                      (utils.nItems('factoid', len(L), between='requested'),
                       utils.commaAndify(L)))
        else:
            irc.error('No factoids have been requested from my database.')

    def listauth(self, irc, msg, args):
        """[<channel>] <author name>

        Lists the keys of the factoids with the given author.  Note that if an
        author has an integer name, you'll have to use that author's id to use
        this function (so don't use integer usernames!).  <channel> is only
        necessary if the message isn't sent in the channel itself.
        """
        channel = getChannel(irc, msg, args)
        author = privmsgs.getArgs(args)
        try:
            id = ircdb.users.getUserId(author)
        except KeyError:
            irc.errorNoUser(name=author, Raise=True)
        results = self.db.getKeysByAuthor(channel, id)
        if not results:
            irc.reply('No factoids by "%s" found.' % author)
            return
        keys = ['"%s"' % t[0] for t in results]
        s = 'Author search for "%s" (%s found): %s' % \
            (author, len(keys), utils.commaAndify(keys))
        irc.reply(s)

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

        Lists the keys of the factoids whose key contains the provided text.
        <channel> is only necessary if the message isn't sent in the channel
        itself.
        """
        channel = getChannel(irc, msg, args)
        search = privmsgs.getArgs(args)
        glob = '%' + search + '%'
        results = self.db.getKeysByGlob(channel, glob)
        if not results:
            irc.reply('No keys matching "%s" found.' % search)
        elif len(results) == 1 and \
             self.registryValue('showFactoidIfOnlyOneMatch', channel):
            key = results[0][0]
            self.tokenizedCommand(irc, msg, [key])
        else:
            keys = ['"%s"' % tup[0] for tup in results]
            s = 'Key search for "%s" (%s found): %s' % \
                (search, len(keys), utils.commaAndify(keys))
            irc.reply(s)

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

        Lists the keys of the factoids whose value contains the provided text.
        <channel> is only necessary if the message isn't sent in the channel
        itself.
        """
        channel = getChannel(irc, msg, args)
        search = privmsgs.getArgs(args)
        glob = '%' + search + '%'
        results = self.db.getKeysByValueGlob(channel, glob)
        if not results:
            irc.reply('No values matching "%s" found.' % search)
            return
        keys = ['"%s"' % tup[0] for tup in results]
        s = 'Value search for "%s" (%s found): %s' % \
            (search, len(keys), utils.commaAndify(keys))
        irc.reply(s)

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

        Deletes the factoid with the given key.  <channel> is only necessary
        if the message isn't sent in the channel itself.
        """
        channel = getChannel(irc, msg, args)
        key = privmsgs.getArgs(args)
        _ = self._getUserId(irc, msg.prefix)
        _ = self._getFactoid(irc, channel, key)
        self._checkNotLocked(irc, channel, key)
        self.db.removeFactoid(channel, key)
        irc.replySuccess()

    # XXX What the heck?  Why are there two definitions of randomfactoid?
    def randomfactoid(self, irc, msg, args):
        """[<channel>]

        Displays a random factoid (along with its key) from the database.
        <channel> is only necessary if the message isn't sent in the channel
        itself.
        """
        channel = getChannel(irc, msg, args)
        results = self.db.randomFactoid(channel)
        if not results:
            irc.error('No factoids in the database.')
            return
        (fact, key) = results
        irc.reply('Random factoid: "%s" is "%s"' % (key, fact))

Class = MoobotFactoids

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