#!/usr/bin/env python

###
# Copyright (c) 2002, Jeremiah Fincher
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###

"""
Various utility commands, mostly useful for manipulating nested commands.
"""

__revision__ = "$Id$"

import plugins

import string

import utils
import ircmsgs
import ircutils
import privmsgs
import callbacks

class Utilities(callbacks.Privmsg):
    def ignore(self, irc, msg, args):
        """requires no arguments

        Does nothing.  Useful sometimes for sequencing commands when you don't
        care about their non-error return values.
        """
        pass

    def success(self, irc, msg, args):
        """requires no arguments

        Does nothing except to reply with a success message.  This is useful
        when you want to run multiple commands as nested commands, and don't
        care about their output as long as they're successful.  An error, of
        course, will break out of this command.
        """
        irc.replySuccess()

    def last(self, irc, msg, args):
        """<text> [<text> ...]

        Returns the last argument given.  Useful when you'd like multiple
        nested commands to run, but only the output of the last one to be
        returned.
        """
        if args:
            irc.reply(args[-1])
        else:
            raise callbacks.Error
        
    def strjoin(self, irc, msg, args):
        """<separator> <string 1> [<string> ...]

        Joins all the arguments together with <separator>.
        """
        sep = args.pop(0)
        irc.reply(sep.join(args))

    def strtranslate(self, irc, msg, args):
        """<chars to translate> <chars to replace those with> <text>

        Replaces <chars to translate> with <chars to replace those with> in
        <text>.  The first and second arguments must necessarily be the same
        length.
        """
        (bad, good, text) = privmsgs.getArgs(args, required=3)
        irc.reply(text.translate(string.maketrans(bad, good)))

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

        Returns <text> uppercased.
        """
        irc.reply(privmsgs.getArgs(args).upper())

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

        Returns <text> lowercased.
        """
        irc.reply(privmsgs.getArgs(args).lower())

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

        Returns the length of <text>.
        """
        total = 0
        for arg in args:
            total += len(arg)
        total += len(args)-1 # spaces between the arguments.
        irc.reply(str(total))

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

        Returns the text surrounded by double quotes.
        """
        text = privmsgs.getArgs(args)
        irc.reply(utils.dqrepr(text))

    def strconcat(self, irc, msg, args):
        """<string 1> <string 2>

        Concatenates two strings.  Do keep in mind that this is *not* the same
        thing as strjoin "", since if <string 2> contains spaces, they won't be
        removed by strconcat.
        """
        (first, second) = privmsgs.getArgs(args, required=2)
        irc.reply(first+second)

    def echo(self, irc, msg, args):
        """takes any number of arguments

        Returns the arguments given it.  Uses our standard substitute on the
        string(s) given to it; $nick (or $who), $randomNick, $randomInt,
        $botnick, $channel, $user, $host, $today, $now, and $randomDate are all
        handled appropriately.
        """
        if not args:
            raise callbacks.ArgumentError
        text = privmsgs.getArgs(args)
        text = plugins.standardSubstitute(irc, msg, text)
        irc.reply(text, prefixName=False)

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

        If <regexp> is of the form m/regexp/flags, returns the portion of
        <text> that matches the regexp.  If <regexp> is of the form
        s/regexp/replacement/flags, returns the result of applying such a
        regexp to <text>
        """
        (regexp, text) = privmsgs.getArgs(args, required=2)
        self.log.info('re command called with regexp %r from %s' %
                      (regexp, msg.prefix))
        if len(regexp) > 512:
            irc.error('Your regexp is just plain too long.')
            return
        f = None
        try:
            r = utils.perlReToPythonRe(regexp)
            f = lambda s: r.search(s) and r.search(s).group(0) or ''
        except ValueError, e:
            try:
                f = utils.perlReToReplacer(regexp)
            except ValueError, e:
                irc.error('Invalid regexp: %s' % e.args[0])
                return
            if f is None:
                irc.error('Invalid regexp: %s' % e.args[0])
                return
        if f('') and len(f(' ')) > len(f(''))+1: # Matches the empty string.
            s = 'You probably don\'t want to match the empty string.'
            irc.error(s)
        else:
            irc.reply(f(text))
    re = privmsgs.checkCapability(re, 'trusted')

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

        Tokenizes <text> and calls <command> with the resulting arguments.
        """
        if not args:
            raise callbacks.ArgumentError
        command = args.pop(0)
        args = [token and token or '""' for token in args]
        text = privmsgs.getArgs(args)
        commands = command.split()
        commands = map(callbacks.canonicalName, commands)
        tokens = callbacks.tokenize(text)
        allTokens = commands + tokens
        print '***', allTokens
        Owner = irc.getCallback('Owner')
        Owner.processTokens(irc, msg, allTokens)
        


Class = Utilities
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