#!/usr/bin/env python

###
# Copyright (c) 2002, Jeremiah Fincher
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#
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# modification, are permitted provided that the following conditions are met:
#
#   * Redistributions of source code must retain the above copyright notice,
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#     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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# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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###

"""
Allows 'aliases' for other commands.
"""

import plugins

import re
import new
import sets

import conf
import debug
import utils
import privmsgs
import callbacks

def configure(onStart, afterConnect, advanced):
    # This will be called by setup.py to configure this module.  onStart and
    # afterConnect are both lists.  Append to onStart the commands you would
    # like to be run when the bot is started; append to afterConnect the
    # commands you would like to be run when the bot has finished connecting.
    from questions import expect, anything, something, yn
    onStart.append('load Alias')

example = utils.wrapLines("""
<jemfinch> @list Alias
<supybot> jemfinch: advogato, alias, debplanet, devshed, freeze, gnome, googlebsd, googlelinux, googlemac, k5, kde, kt, lambda, linuxmag, lj, lwn, nyttech, osnews, pypi, python, slashdot, unalias, unfreeze
<jemfinch> (just pay attention to the freeze/unfreeze and alias/unalias)
<jemfinch> @alias rot26 "rot13 [rot13 $1]"
<supybot> jemfinch: The operation succeeded.
<jemfinch> @rot26 jemfinch
<supybot> jemfinch: jemfinch
<jemfinch> @unalias rot26
<supybot> jemfinch: The operation succeeded.
<jemfinch> @rot26 jemfinch
<jemfinch> (look, Ma!  No rot26!)
<Cerlyn> ooohh
<jemfinch> @alias rot26 "rot13 [rot13 $1]"
<supybot> jemfinch: The operation succeeded.
<jemfinch> @freeze rot26
<supybot> jemfinch: The operation succeeded.
<jemfinch> (now's your queue :))
<Cerlyn> @unalias rot26
<supybot> Cerlyn: Error: That alias is frozen.
<Cerlyn> @unalias rot26nothere
<supybot> Cerlyn: Error: There is no such alias.
<Cerlyn> @unfreeze rot26
<supybot> Cerlyn: Error: You don't have the "admin" capability.
<jemfinch> @unfreeze rot26
<supybot> jemfinch: The operation succeeded.
<jemfinch> (now try to remove it :))
<Cerlyn> @unalias rot26
<supybot> Cerlyn: The operation succeeded.
<jemfinch> @rot26 blah blah blah
<jemfinch> (note that it did nothing)
<jemfinch> @help slashdot
<supybot> jemfinch: slashdot <an alias, 0 arguments> (for more help use the morehelp command)
<jemfinch> @morehelp slashdot
<supybot> jemfinch: Alias for 'rsstitles http://slashdot.org/slashdot.rss'
""")

class AliasError(Exception):
    pass

class RecursiveAlias(AliasError):
    pass

def findAliasCommand(s, alias):
    s = re.escape(s)
    r = re.compile(r'(?:(^|\[)\s*%s|\|\s*%s)' % (s, s))
    return bool(r.search(alias))

dollarRe = re.compile(r'\$(\d+)')
def findBiggestDollar(alias):
    dollars = dollarRe.findall(alias)
    dollars = map(int, dollars)
    dollars.sort()
    if dollars:
        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

def makeNewAlias(name, alias):
    if findAliasCommand(name, alias):
        raise RecursiveAlias
    doChannel = '$channel' in alias
    biggestDollar = findBiggestDollar(alias)
    biggestAt = findBiggestAt(alias)
    def f(self, irc, msg, args):
        alias_ = alias
        if doChannel:
            channel = privmsgs.getChannel(msg, args)
            alias_ = alias.replace('$channel', channel)
        if biggestDollar or biggestAt:
            args = privmsgs.getArgs(args, needed=biggestDollar,
                                    optional=biggestAt)
            # Gotta have a tuple.
            if biggestDollar + biggestAt == 1:
                args = (args,)
            def replace(m):
                idx = int(m.group(1))
                return utils.dqrepr(args[idx-1])
            alias_ = dollarRe.sub(replace, alias_)
            args = args[biggestDollar:]
            alias_ = atRe.sub(replace, alias_)
        self.Proxy(irc.irc, msg, callbacks.tokenize(alias_))
    #f = new.function(f.func_code, f.func_globals, alias)
    f.__doc__ ='<an alias, %s>\n\nAlias for %r' % \
                (utils.nItems(biggestDollar, 'argument'), alias)
    #f = new.function(f.func_code, f.func_globals, name)
    return f


class Alias(callbacks.Privmsg):
    def __init__(self):
        callbacks.Privmsg.__init__(self)
        self.frozen = sets.Set()

    def freeze(self, irc, msg, args):
        """<alias>

        'Freezes' an alias so that no one else can change it.
        """
        name = privmsgs.getArgs(args)
        name = callbacks.canonicalName(name)
        if hasattr(self, name) and self.isCommand(name):
            self.frozen.add(name)
            irc.reply(msg, conf.replySuccess)
        else:
            irc.error(msg, 'There is no such alias.')
    freeze = privmsgs.checkCapability(freeze, 'admin')

    def unfreeze(self, irc, msg, args):
        """<alias>

        'Unfreezes' an alias so that people can define new aliases over it.
        """
        name = privmsgs.getArgs(args)
        name = callbacks.canonicalName(name)
        if hasattr(self, name) and self.isCommand(name):
            self.frozen.discard(name)
            irc.reply(msg, conf.replySuccess)
        else:
            irc.error(msg, 'There is no such alias.')
    unfreeze = privmsgs.checkCapability(unfreeze, 'admin')

    _invalidCharsRe = re.compile(r'[\[\]\s]')
    def addAlias(self, irc, name, alias, freeze=False):
        if self._invalidCharsRe.search(name):
            raise AliasError, 'Names cannot contain spaces or square brackets.'
        if conf.enablePipeSyntax and '|' in name:
            raise AliasError, 'Names cannot contain pipes.'
        realName = callbacks.canonicalName(name)
        if name != realName:
            raise AliasError,'That name isn\'t valid.  Try %r instead'%realName
        name = realName
        cb = callbacks.findCallbackForCommand(irc, name)
        if cb is not None and cb != self:
            raise AliasError, 'A command with that name already exists.'
        if name in self.frozen:
            raise AliasError, 'That alias is frozen.'
        try:
            f = makeNewAlias(name, alias)
        except RecursiveAlias:
            raise AliasError, 'You can\'t define a recursive alias.'
        setattr(self.__class__, name, f)
        if freeze:
            self.frozen.add(name)

    def removeAlias(self, name, evenIfFrozen=False):
        name = callbacks.canonicalName(name)
        if hasattr(self, name) and self.isCommand(name):
            if evenIfFrozen or name not in self.frozen:
                delattr(self.__class__, name)
                self.frozen.discard(name)
            else:
                raise AliasError, 'That alias is frozen.'
        else:
            raise AliasError, 'There is no such alias.'

    def alias(self, irc, msg, args):
        """<name> <alias commands>

        Defines an alias <name> for the commands <commands>.  The <commands>
        should be in the standard [command argument [nestedcommand argument]]
        format.  Underscores can be used to represent arguments to the alias
        itself; for instance ...
        """
        (name, alias) = privmsgs.getArgs(args, needed=2)
        try:
            self.addAlias(irc, name, alias)
            irc.reply(msg, conf.replySuccess)
        except AliasError, e:
            irc.error(msg, str(e))

    def unalias(self, irc, msg, args):
        """<name>

        Removes the given alias, if unfrozen.
        """
        name = privmsgs.getArgs(args)
        try:
            self.removeAlias(name)
            irc.reply(msg, conf.replySuccess)
        except AliasError, e:
            irc.error(msg, str(e))


Class = Alias

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