Limnoria/plugins/Alias.py

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#!/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.
###
"""
Allows 'aliases' for other commands.
"""
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__revision__ = "$Id$"
import plugins
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import os
import re
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import sets
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import conf
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import utils
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import privmsgs
import callbacks
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import structures
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class AliasError(Exception):
pass
class RecursiveAlias(AliasError):
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pass
def findAliasCommand(s, alias):
s = re.escape(s)
r = re.compile(r'(?:(^|\[)\s*\b%s\b|\|\s*\b%s\b)' % (s, s))
return bool(r.search(alias))
dollarRe = re.compile(r'\$(\d+)')
def findBiggestDollar(alias):
dollars = dollarRe.findall(alias)
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dollars = map(int, dollars)
dollars.sort()
if dollars:
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return dollars[-1]
else:
return 0
atRe = re.compile(r'@(\d+)')
def findBiggestAt(alias):
ats = atRe.findall(alias)
ats = map(int, ats)
ats.sort()
if ats:
return ats[-1]
else:
return 0
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def makeNewAlias(name, alias):
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original = alias
if findAliasCommand(name, alias):
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raise RecursiveAlias
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biggestDollar = findBiggestDollar(original)
biggestAt = findBiggestAt(original)
wildcard = '$*' in original
if biggestAt and wildcard:
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raise AliasError, 'Can\'t mix $* and optional args (@1, etc.)'
if original.count('$*') > 1:
raise AliasError, 'There can be only one $* in an alias.'
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def f(self, irc, msg, args):
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alias = original.replace('$nick', msg.nick)
if '$channel' in original:
channel = privmsgs.getChannel(msg, args)
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alias = alias.replace('$channel', channel)
tokens = callbacks.tokenize(alias)
if not wildcard and biggestDollar or biggestAt:
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args = privmsgs.getArgs(args,
required=biggestDollar,
optional=biggestAt)
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# Gotta have a mutable sequence (for replace).
if biggestDollar + biggestAt == 1: # We got a string, no tuple.
args = [args]
def regexpReplace(m):
idx = int(m.group(1))
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return args[idx-1]
def replace(tokens, replacer):
for (i, token) in enumerate(tokens):
if isinstance(token, list):
replace(token, replacer)
else:
tokens[i] = replacer(token)
replace(tokens, lambda s: dollarRe.sub(regexpReplace, s))
if biggestAt:
assert not wildcard
args = args[biggestDollar:]
replace(tokens, lambda s: atRe.sub(regexpReplace, s))
if wildcard:
assert not biggestAt
# Gotta remove the things that have already been subbed in.
i = biggestDollar
while i:
args.pop(0)
i -= 1
def everythingReplace(tokens):
for (i, token) in enumerate(tokens):
if isinstance(token, list):
if everythingReplace(token):
return
if token == '$*':
tokens[i:i+1] = args
return True
elif '$*' in token:
tokens[i] = token.replace('$*', ' '.join(args))
return True
return False
everythingReplace(tokens)
Owner = irc.getCallback('Owner')
Owner.disambiguate(irc, tokens)
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self.Proxy(irc.irc, msg, tokens)
doc ='<an alias, %s>\n\nAlias for %r' % \
(utils.nItems('argument', biggestDollar), alias)
f = utils.changeFunctionName(f, name, doc)
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return f
class Alias(callbacks.Privmsg):
def __init__(self):
callbacks.Privmsg.__init__(self)
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filename = os.path.join(conf.supybot.directories.data(), 'Aliases.db')
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# Schema: {name: [alias, locked]}
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self.aliases = structures.PersistentDictionary(filename)
def __call__(self, irc, msg):
# Adding the aliases requires an Irc. So the first time we get called
# with an Irc, we add our aliases and then delete ourselves :)
for (name, (alias, locked)) in self.aliases.items():
try:
self.addAlias(irc, name, alias, locked)
except Exception, e:
self.log.exception('Exception when trying to add alias %s. '
'Removing from the Alias database.' % name)
del self.aliases[name]
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del self.__class__.__call__
def die(self):
self.aliases.close()
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def lock(self, irc, msg, args):
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"""<alias>
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Locks an alias so that no one else can change it.
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"""
name = privmsgs.getArgs(args)
name = callbacks.canonicalName(name)
if hasattr(self, name) and self.isCommand(name):
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self.aliases[name][1] = True
irc.replySuccess()
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else:
irc.error('There is no such alias.')
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lock = privmsgs.checkCapability(lock, 'admin')
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def unlock(self, irc, msg, args):
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"""<alias>
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Unlocks an alias so that people can define new aliases over it.
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"""
name = privmsgs.getArgs(args)
name = callbacks.canonicalName(name)
if hasattr(self, name) and self.isCommand(name):
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self.aliases[name][1] = False
irc.replySuccess()
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else:
irc.error('There is no such alias.')
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unlock = privmsgs.checkCapability(unlock, 'admin')
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_invalidCharsRe = re.compile(r'[\[\]\s]')
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def addAlias(self, irc, name, alias, lock=False):
if self._invalidCharsRe.search(name):
raise AliasError, 'Names cannot contain spaces or square brackets.'
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if conf.supybot.pipeSyntax() and '|' in name:
raise AliasError, 'Names cannot contain pipes.'
realName = callbacks.canonicalName(name)
if name != realName:
s = 'That name isn\'t valid. Try %r instead.' % realName
raise AliasError, s
name = realName
cbs = callbacks.findCallbackForCommand(irc, name)
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if self in cbs:
if hasattr(self, realName) and realName not in self.aliases:
s = 'You can\'t overwrite commands in this plugin.'
raise AliasError, s
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if name in self.aliases:
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(currentAlias, locked) = self.aliases[name]
if locked and currentAlias != alias:
raise AliasError, 'Alias %r is locked.' % name
try:
f = makeNewAlias(name, alias)
except RecursiveAlias:
raise AliasError, 'You can\'t define a recursive alias.'
setattr(self.__class__, name, f)
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self.aliases[name] = [alias, lock]
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def removeAlias(self, name, evenIfLocked=False):
name = callbacks.canonicalName(name)
if hasattr(self, name) and self.isCommand(name):
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if evenIfLocked or not self.aliases[name][1]:
delattr(self.__class__, name)
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del self.aliases[name]
else:
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raise AliasError, 'That alias is locked.'
else:
raise AliasError, 'There is no such alias.'
def add(self, irc, msg, args):
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"""<name> <alias>
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Defines an alias <name> that executes <alias>. The <alias>
should be in the standard "command argument [nestedcommand argument]"
format. $[digit] (like $1, $2, etc.) can be used to represent
arguments to the alias; they'll be filled with the first, second, etc.
arguments. @1, @2 can be used for optional arguments. $* simply
means "all remaining arguments," and cannot be combined with optional
arguments.
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"""
(name, alias) = privmsgs.getArgs(args, required=2)
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try:
self.addAlias(irc, name, alias)
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self.log.info('Adding alias %r for %r (from %s)' %
(name, alias, msg.prefix))
irc.replySuccess()
except AliasError, e:
irc.error(str(e))
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def remove(self, irc, msg, args):
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"""<name>
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Removes the given alias, if unlocked.
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"""
name = privmsgs.getArgs(args)
try:
self.removeAlias(name)
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self.log.info('Removing alias %r (from %s)' % (name, msg.prefix))
irc.replySuccess()
except AliasError, e:
irc.error(str(e))
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Class = Alias
# vim:set shiftwidth=4 tabstop=8 expandtab textwidth=78: