Limnoria/plugins/Scheduler.py

#!/usr/bin/env python

###
# Copyright (c) 2003, 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.
"""

__revision__ = "$Id$"
__author__ = 'Jeremy Fincher (jemfinch) <jemfinch@users.sf.net>'

import plugins

import sets
import time

import conf
import utils
import privmsgs
import schedule
import 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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