Limnoria/plugins/Scheduler.py

###
# Copyright (c) 2003-2004, Jeremiah Fincher
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###

"""
Gives the user the ability to schedule commands to run at a particular time,
or repeatedly run at a particular interval.
"""

import supybot

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

import supybot.plugins as plugins

import sets
import time

import supybot.conf as conf
import supybot.utils as utils
import supybot.privmsgs as privmsgs
import supybot.schedule as schedule
import supybot.callbacks as callbacks


class Scheduler(callbacks.Privmsg):
    def __init__(self):
        callbacks.Privmsg.__init__(self)
        self.events = {}

    def _makeCommandFunction(self, irc, msg, command, remove=True):
        """Makes a function suitable for scheduling from command."""
        tokens = callbacks.tokenize(command)
        Owner = irc.getCallback('Owner')
        ambiguous = Owner.disambiguate(irc, tokens)
        if ambiguous:
            raise callbacks.Error, callbacks.ambiguousReply(ambiguous)
        def f():
            if remove:
                del self.events[str(f.eventId)]
            self.Proxy(irc.irc, msg, tokens)
        return f

    def add(self, irc, msg, args):
        """<seconds> <command>

        Schedules the command string <command> to run <seconds> seconds in the
        future.  For example, 'scheduler add [seconds 30m] "echo [cpu]"' will
        schedule the command "cpu" to be sent to the channel the schedule add
        command was given in (with no prefixed nick, a consequence of using
        echo).
        """
        (seconds, command) = privmsgs.getArgs(args, required=2)
        try:
            seconds = int(seconds)
        except ValueError:
            irc.error('Invalid seconds value: %r' % seconds)
            return
        f = self._makeCommandFunction(irc, msg, command)
        id = schedule.addEvent(f, time.time() + seconds)
        f.eventId = id
        self.events[str(id)] = command
        irc.replySuccess('Event #%s added.' % id)

    def remove(self, irc, msg, args):
        """<id>

        Removes the event scheduled with id <id> from the schedule.
        """
        id = privmsgs.getArgs(args)
        id = id.lower()
        if id in self.events:
            del self.events[id]
            try:
                id = int(id)
            except ValueError:
                pass
            try:
                schedule.removeEvent(id)
                irc.replySuccess()
            except KeyError:
                irc.error('Invalid event id.')
        else:
            irc.error('Invalid event id.')

    def repeat(self, irc, msg, args):
        """<name> <seconds> <command>

        Schedules the command <command> to run every <seconds> seconds,
        starting now (i.e., the command runs now, and every <seconds> seconds
        thereafter).  <name> is a name by which the command can be
        unscheduled.
        """
        (name, seconds, command) = privmsgs.getArgs(args, required=3)
        name = name.lower()
        try:
            seconds = int(seconds)
        except ValueError:
            irc.error('Invalid seconds: %r' % seconds)
            return
        try:
            name = int(name)
            irc.error('Names must not be an integer.')
            return
        except ValueError:
            pass
        self.events[name] = command
        f = self._makeCommandFunction(irc, msg, command, remove=False)
        id = schedule.addPeriodicEvent(f, seconds, name)
        assert id == name
        # We don't reply because the command runs immediately.
        # But should we?  What if the command doesn't have visible output?
        # irc.replySuccess()

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

        Lists the currently scheduled events.
        """
        L = self.events.items()
        if L:
            L.sort()
            for (i, (name, command)) in enumerate(L):
                L[i] = '%s: %s' % (name, utils.dqrepr(command))
            irc.reply(utils.commaAndify(L))
        else:
            irc.reply('There are currently no scheduled commands.')


Class = Scheduler

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