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<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook V4.1//EN">
<article>
<articleinfo>
<authorgroup>
<author>
<firstname>Jeremiah</firstname>
<surname>Fincher</surname>
</author>
<editor>
<firstname>Daniel</firstname>
<surname>DiPaolo</surname>
<contrib>DocBook translator</contrib>
</editor>
</authorgroup>
<title>Supybot plugin author example</title>
<revhistory>
<revision>
<revnumber>0.1</revnumber>
<date>13 Sep 2003</date>
<revremark>Initial revision</revremark>
</revision>
<revision>
<revnumber>0.2</revnumber>
<date>14 Sep 2003</date>
<revremark>Converted to DocBook</revremark>
</revision>
<revision>
<revnumber>0.3</revnumber>
<date>24 Nov 2003</date>
<revremark>
Updated to match EXAMPLE included with 0.75.0
</revremark>
</revision>
</revhistory>
</articleinfo>
<sect1>
<title>Introduction</title>
<para>
Ok, so you want to write a callback for supybot. Good, then this
is the place to be. We're going to start from the top (the
highest level, where supybot code does the most work for you) and
move lower after that.
</para>
<para>
So have you used supybot? If not, you need to go use it, get a
feel for it, see how the various commands work and such.
</para>
<para>
So now that we know you've used supybot, we'll start getting into
details.
</para>
</sect1>
<sect1>
<title>Creating your own plugin</title>
<sect2>
<title>
Using <application>scripts/newplugin.py</application>
</title>
<para>
First, the easiest way to start writing a module is to use the
wizard provided,
<application>scripts/newplugin.py</application>. Here's an
example session:
</para>
<screen>
functor% scripts/newplugin.py
What should the name of the plugin be? Random
Supybot offers two major types of plugins: command-based and regexp-
based. Command-based plugins are the kind of plugins you've seen most
when you've used supybot. They're also the most featureful and
easiest to write. Commands can be nested, for instance, whereas
regexp-based callbacks can't do nesting. That doesn't mean that
you'll never want regexp-based callbacks. They offer a flexibility
that command-based callbacks don't offer; however, they don't tie into
the whole system as well. If you need to combine a command-based
callback with some regexp-based methods, you can do so by subclassing
callbacks.PrivmsgCommandAndRegexp and then adding a class-level
attribute "regexps" that is a sets.Set of methods that are regexp-
based. But you'll have to do that yourself after this wizard is
finished :)
Do you want a command-based plugin or a regexp-based plugin? [command/
regexp] command
Sometimes you'll want a callback to be threaded. If its methods
(command or regexp-based, either one) will take a signficant amount
of time to run, you'll want to thread them so they don't block
the entire bot.
Does your plugin need to be threaded? [y/n] n
Your new plugin template is in plugins/Random.py
functor%
</screen>
<para>
So that's what it looks like. Now let's look at the source
code (if you'd like to look at it in your programming editor,
the whole plugin is available as
<filename>examples/Random.py</filename>):
</para>
<programlisting>
#!/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.
###
"""
Add the module docstring here. This will be used by the setup.py script.
"""
from baseplugin import *
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 Random')
class Random(callbacks.Privmsg):
pass
Class = Random
# vim:set shiftwidth=4 tabstop=8 expandtab textwidth=78:
</programlisting>
</sect2>
<sect2>
<title>Customizing the boilerplate code</title>
<para>
So a few notes, before we customize it.
</para>
<para>
You'll probably want to change the copyright notice to be your
name. It wouldn't stick even if you kept my name, so you
might as well :)
</para>
<para>
Describe what you want the plugin to do in the docstring.
This is used in <application>scripts/setup.py</application> in
order to explain to the user the purpose of the module. It's
also returned when someone asks the bot for help for a given
module (instead of help for a certain command). We'll change
this one to <literal>"Lots of stuff relating to random
numbers."</literal>
</para>
<para>
Then there are the imports. The <varname>callbacks</varname>
module is used (the class you're given subclasses
<varname>callbacks.Privmsg</varname>) but the
<varname>privmsgs</varname> module isn't used. That's
alright; we can almost guarantee you'll use it, so we go ahead
and add the import to the template.
</para>
<para>
Then you see a <function>configure</function> function. This
the function that's called when users decide to add your
module in <application>scripts/setup.py</application>. You'll
note that by default it simply adds <literal>"load
Example"</literal> (where 'Example' is the name you provided
as the name of your plugin, so in our case it is
<literal>"load Random"</literal>) at the bottom. For many
plugins this is all you need; for more complex plugins, you
might need to ask questions and add commands based on the
answers.
</para>
</sect2>
<sect2>
<title>Digging in: customizing the plugin class</title>
<para>
Now comes the meat of the plugin: the plugin class.
</para>
<para>
What you're given is a skeleton: a simple subclass of
<varname>callbacks.Privmsg</varname> for you to start with.
Now let's add a command.
</para>
<para>
I don't know what you know about random number generators, but
the short of it is that they start at a certain number (a
seed) and they continue (via some somewhat
complicated/unpredictable algorithm) from there. This seed
(and the rest of the sequence, really) is all nice and
packaged up in Python's <varname>random</varname> module, the
<varname>Random</varname> object. So the first thing we're
going to have to do is give our plugin a
<varname>Random</varname> object.
</para>
<para>
Normally, when we want to give instances of a class an object,
we'll do so in the <function>__init__</function> method. And
that works great for plugins, too. The one thing you have to
be careful of is that you call the superclass
<function>__init__</function> method at the end of your own
<function>__init__</function>. So to add this
<varname>random.Random</varname> object to our plugin, we can
replace the <function>pass</function> statement with
this:
</para>
<programlisting>
def __init__(self):
self.rng = random.Random()
callbacks.Privmsg.__init__(self)
</programlisting>
<para>
(<varname>rng</varname>is an abbreviation for "random number
generator," in case you were curious)
</para>
<para>
Do be careful not to give your <function>__init__</function>
any arguments (other than <varname>self</varname>, of course).
There's no way anything will ever get to them! If you have
some sort of initial values you need to get to your plugin
before it can do anything interesting, add a command that gets
those values. By convention, those commands begin with
"start" -- check out the Relay and Enforcer plugins for
examples of such commands.
</para>
<para>
There's an easier way to get our plugin to have its own rng
than to define an <function>__init__</function>. Plugins are
unique among classes because we're always certain that there
will only be one instance -- supybot doesn't allow us to load
multiple instances of a single plugin. So instead of adding
the rng in <function>__init__</function>, we can just add it
as a attribute to the class itself. Like so (replacing the
<function>pass</function> statement again):
</para>
<programlisting>
rng = random.Random()
</programlisting>
<para>
And we save two lines of code and make our code a little more
clear :)
</para>
<para>
Now that we have an RNG, we need some way to get random
numbers. So first, we'll add a command that simply gets the
next random number and gives it back to the user. It takes no
arguments, of course (what would you give it?). Here's the
command, and I'll follow that with the explanation of what
each part means.
</para>
<programlisting>
def random(self, irc, msg, args):
"""takes no arguments
Returns the next random number generated by the random number
generator.
"""
irc.reply(msg, str(self.rng.random()))
</programlisting>
<para>
And that's it! Pretty simple, huh? Anyway, you're probably
wondering what all that <emphasis>means</emphasis>. We'll
start with the <function>def</function> statement:
</para>
<programlisting>
def random(self, irc, msg, args):
</programlisting>
<para>
What that does is define a command
<function>random</function>. You can call it by saying
"@random" (or whatever prefix character your specific bot
uses). The arguments are a bit less obvious.
<varname>self</varname> is self-evident (hah!).
<varname>irc</varname> is the <varname>Irc</varname> object
passed to the command; <varname>msg</varname> is the original
<varname>IrcMsg</varname> object. But you're really not going
to have to deal with either of these too much (with the
exception of calling <function>irc.reply</function> or
<function>irc.error</function>). What you're
<emphasis>really</emphasis> interested in is the
<varname>args</varname> arg. That if a list of all the
arguments passed to your command, pre-parsed and already
evaluated (i.e., you never have to worry about nested
commands, or handling double quoted strings, or splitting on
whitespace -- the work has already been done for you). You
can read about the <varname>Irc</varname> object in
<filename>irclib.py</filename> (you won't find
<function>.reply</function> or <function>.error</function>
there, though, because you're actually getting an
<varname>IrcObjectProxy</varname>, but that's beyond the level
we want to describe here :)). You can read about the
<varname>msg</varname> object in
<filename>ircmsgs.py</filename>. But again, aside from
calling <function>irc.reply</function> or
<function>irc.error</function>, you'll very rarely be using
these objects.
</para>
<para>
(In case you're curious, the answer is yes, you
<emphasis>must</emphasis> name your arguments <varname>(self,
irc, msg, args)</varname>. The names of those arguments is
one of the ways that supybot uses to determine which methods
in a plugin class are commands and which aren't. And while
we're talking about naming restrictions, all your commands
should be named in all-lowercase with no underscores. Before
calling a command, supybot always converts the command name to
lowercase and removes all dashes and underscores. On the
other hand, you now know an easy way to make sure a method is
never called (even if its arguments are <varname>(self, irc,
msg, args)</varname>, however unlikely that may be). Just
name it with an underscore or an uppercase letter in it :))
</para>
<para>
You'll also note that the docstring is odd. The wonderful
thing about the supybot framework is that it's easy to write
complete commands with help and everything: the docstring
<emphasis>is</emphasis> the help! Given the above docstring,
this is what a supybot does:
</para>
<screen>
&lt;angryman&gt; jemfinch: random takes no arguments (for more help
use the morehelp command)
&lt;jemfinch&gt; $morehelp random
&lt;angryman&gt; jemfinch: Returns the next random number from the
current random number generator.
</screen>
<para>
'help &lt;command&gt;' replies with the command name followed
by the first line of the command's docstring; there should be
a blank line following, and then 'morehelp &lt;command&gt;'
will reply with the remainder of the docstring. So that
explains the docstring. Now on to the actual body of the
function:
</para>
<programlisting>
irc.reply(msg, str(self.rng.random()))
</programlisting>
<para>
<function>irc.reply</function> takes two arguments, an
<varname>IrcMsg</varname> (like the one passed into your
function) and a string. The <varname>IrcMsg</varname> is used
to determine who the reply should go to and whether or not it
should be sent in private message (commands sent in private
are replied to in private). The string is the reply to be
sent. Don't worry about length restrictions or anything -- if
the string you want to send is too big for an IRC message (and
oftentimes that turns out to be the case :)) the supybot
framework handles that entirely transparently to you. Do make
sure, however, that you give <function>irc.reply</function> a
string. It doesn't take anything else (sometimes even unicode
fails!). That's why we have "str(self.rng.random())" instead
of simply "self.rng.random()" -- we had to give
<function>irc.reply</function> a string.
</para>
<para>
Anyway, now that we have an RNG, we have a need for seed! Of
course, Python gives us a good seed already (it uses the
current time as a seed if we don't give it one) but users
might want to be able to repeat "random" sequences, so letting
them set the seed is a good thing. So we'll add a seed
command to give the RNG a specific seed:
</para>
<programlisting>
def seed(self, irc, msg, args):
"""&lt;seed&gt;
Sets the seed of the random number generator. &lt;seed&gt; must be
an int or a long.
"""
seed = privmsgs.getArgs(args)
try:
seed = long(seed)
except ValueError:
# It wasn't a valid long!
irc.error(msg, '&lt;seed&gt; must be a valid int or long.')
return
self.rng.seed(seed)
irc.reply(msg, conf.replySuccess)
</programlisting>
<para>
So this one's a bit more complicated. But it's still pretty
simple. The method name is "seed" so that'll be the command
name. The arguments are the same, the docstring is of the
same form, so we don't need to go over that again. The body
of the function, however, is significantly different.
</para>
<para>
<function>privmsgs.getArgs</function> is a function you're
going to be seeing a lot of when you write plugins for
supybot. What it does is basically give you the right number
of arguments for your comamnd. In this case, we want one
argument. But we might have been given any number of
arguments by the user. So
<function>privmsgs.getArgs</function> joins them
appropriately, leaving us with one single "seed" argument (by
default, it returns one argument as a single value; more
arguments are returned in a tuple/list). Yes, we could've
just said "seed = args[0]" and gotten the first argument, but
what if the user didn't pass us an argument at all? Then
we've got to catch the <varname>IndexError</varname> from
<varname>args[0]</varname> and complain to the user about it.
<function>privmsgs.getArgs</function>, on the other hand,
handles all that for us. If the user didn't give us enough
arguments, it'll reply with the help string for the command,
thus saving us the effort.
</para>
<para>
So we have the seed from
<function>privmsgs.getArgs</function>. But it's a string.
The next three lines is pretty darn obvious: we're just
converting the string to a int of some sort. But if it's not,
that's when we're going to call
<function>irc.error</function>. It has the same interface as
we saw before in <function>irc.reply</function>, but it makes
sure to remind the user that an error has been encountered
(currently, that means it puts "Error: " at the beginning of
the message). After erroring, we return. It's important to
remember this <function>return</function> here; otherwise,
we'll just keep going down through the function and try to use
this "seed" variable that never got assigned. A good general
rule of thumb is that any time you use
<function>irc.error</function>, you'll want to return
immediately afterwards.
</para>
<para>
Then we set the seed -- that's a simple function on our rng
object. Assuming that succeeds (and doesn't raise an
exception, which it shouldn't, because we already read the
documentation and know that it should work) we reply to say
that everything worked fine. That's what
<varname>conf.replySuccess</varname> says. By default, it has
the very dry (and appropriately robot-like) "The operation
succeeded." but you're perfectly welcome to customize it
yourself -- <filename>conf.py</filename> was written to be
modified!
</para>
<para>
So that's a bit more complicated command. But we still
haven't dealt with multiple arguments. Let's do that
next.
</para>
<para>
So these random numbers are useful, but they're not the kind
of random numbers we usually want in Real Life. In Real Life,
we like to tell someone to "pick a number between 1 and 10."
So let's write a function that does that. Of course, we won't
hardcode the 1 or the 10 into the function, but we'll take
them as arguments. First the function:
</para>
<programlisting>
def range(self, irc, msg, args):
"""&lt;start&gt; &lt;end&gt;
Returns a number between &lt;start&gt; and &lt;end&gt;, inclusive (i.e., the number
can be either of the endpoints.
"""
(start, end) = privmsgs.getArgs(args, required=2)
try:
end = int(end)
start = int(start)
except ValueError:
irc.error(msg, '&lt;start&gt; and &lt;end&gt; must both be integers.')
return
# .randrange() doesn't include the endpoint, so we use end+1.
irc.reply(msg, str(self.rng.randrange(start, end+1)))
</programlisting>
<para>
Pretty simple. This is becoming old hat by now. The only new
thing here is the call to
<function>privmsgs.getArgs</function>. We have to make sure,
since we want two values, to pass a keyword parameter
"required" into <function>privmsgs.getArgs</function>. Of
course, <function>privmsgs.getArgs</function> handles all the
checking for missing arguments and whatnot so we don't have
to.
</para>
<para>
The <varname>Random</varname> object we're using offers us a
"sample" method that takes a sequence and a number (we'll call
it <varname>N</varname>) and returns a list of
<varname>N</varname> items taken randomly from the sequence.
So I'll show you an example that takes advantage of multiple
arguments but doesn't use
<function>privmsgs.getArgs</function> (and thus has to handle
its own errors if the number of arguments isn't right).
Here's the code:
</para>
<programlisting>
def sample(self, irc, msg, args):
"""&lt;number of items&gt; [&lt;text&gt; ...]
Returns a sample of the &lt;number of items&gt; taken from the remaining
arguments. Obviously &lt;number of items&gt; must be less than the number
of arguments given.
"""
try:
n = int(args.pop(0))
except IndexError: # raised by .pop(0)
raise callbacks.ArgumentError
except ValueError:
irc.error(msg, '&lt;number of items&gt; must be an integer.')
return
if n &gt; len(args):
irc.error(msg, '&lt;number of items&gt; must be less than the number '
'of arguments.')
return
sample = self.rng.sample(args, n)
irc.reply(msg, utils.commaAndify(map(repr, sample)))
</programlisting>
<para>
Most everything here is familiar. The difference between this
and the previous examples is that we're dealing with
<varname>args</varname> directly, rather than through
<function>getArgs</function>. Since we already have the
arguments in a list, it doesn't make any sense to have
<function>privmsgs.getArgs</function> smush them all together
into a big long string that we'll just have to re-split. But
we still want the nice error handling of
<function>privmsgs.getArgs</function>. So what do we do? We
raise <varname>callbacks.ArgumentError</varname>! That's the
secret juju that <function>privmsgs.getArgs</function> is
doing; now we're just doing it ourself. Someone up our
callchain knows how to handle it so a neat error message is
returned. So in this function, if
<function>.pop(0)</function> fails, we weren't given enough
arguments and thus need to tell the user how to call us.
</para>
<para>
So we have the args, we have the number, we do a simple call
to <function>random.sample</function> and then we do this
funky <function>utils.commaAndify</function> to it. Yeah, so
I was running low on useful names :) Anyway, what it does is
take a list of strings and return a string with them joined by
a comma, the last one being joined with a comma and "and". So
the list ['foo', 'bar', 'baz'] becomes "foo, bar, and baz".
It's pretty useful for showing the user lists in a useful
form. We map the strings with <function>repr()</function>
first just to surround them with quotes.
</para>
<para>
So we have one more example. Yes, I hear your groans, but
it's pedagogically useful :) This time we're going to write a
command that makes the bot roll a die. It'll take one
argument (the number of sides on the die) and will respond
with the equivalent of "/me rolls a __" where __ is the number
the bot rolled. So here's the code:
</para>
<programlisting>
def diceroll(self, irc, msg, args):
"""[&lt;number of sides&gt;]
Rolls a die with &lt;number of sides&gt; sides. The default number
of sides is 6.
"""
try:
n = privmsgs.getArgs(args, required=0, optional=1)
if not n:
n = 6
n = int(n)
except ValueError:
irc.error(msg, 'Dice have integer numbers of sides. Use one.')
return
s = 'rolls a %s' % self.rng.randrange(1, n+1)
irc.queueMsg(ircmsgs.action(ircutils.replyTo(msg), s))
raise callbacks.CannotNest
</programlisting>
<para>
There's a lot of stuff you haven't seen before in there. The
most important, though, is the first thing you'll notice
that's different: the <function>privmsg.getArgs</function>
call. Here we're offering a default argument in case the user
is too lazy to supply one (or just wants a nice, standard
six-sided die :)) <function>privmsgs.getArgs</function>
supports that; we'll just tell it that we don't
<emphasis>need</emphasis> any arguments (via
<varname>required=0</varname>) and that we <emphasis>might
like</emphasis> one argument (<varname>optional=1</varname>).
If the user provides an argument, we'll get it -- if they
don't, we'll just get an empty string. Hence the "if not n: n
= 6", where we provide the default.
</para>
<para>
Later, though, you'll see something other than
<function>irc.reply</function>. This is
<function>irc.queueMsg</function>, the general interface for
sending messages to the server. It's what
<function>irc.reply</function> is using under the covers. It
takes an <varname>IrcMsg</varname> object. Fortunately,
that's exactly what's returned by
<function>ircmsgs.action</function>. An action message, just
in case you don't know, is a /me kind of message.
<function>ircmsgs.action</function> is a helper function that
takes a target (a place to send the message, either a channel
or a person) and a payload (the thing to /me) and returns the
appropriate <varname>IrcMsg</varname> object.
<function>ircutils.replyTo</function> simply takes an
<varname>IrcMsg</varname> and returns where we should reply
to; if the message was originally sent to a channel, we'll
reply to there, if it was originally sent to us privately,
we'll reply in private.
</para>
<para>
At the end, you might be surprised by the "raise
callbacks.CannotNest". That's used simply because at the
moment you can't nest actions (just like you can't nest
anything that doesn't go through
<function>irc.reply</function>). That raise just makes sure
the user finds this out if he tries to nest this like "@rot13
[diceroll]".
</para>
<para>
So that's our plugin. 5 commands, each building in
complexity. You should now be able to write most anything you
want to do in Supybot. Except regexp-based plugins, but
that's a story for another day (and those aren't nearly as
cool as these command-based callbacks anyway :)). Now we need
to flesh it out to make it a full-fledged plugin.
</para>
</sect2>
<sect2>
<title>Finishing touches</title>
<para>
Let's take a look at that <function>configure</function>
function <application>scripts/newplugin.py</application> made
for us. Here it is, in case you've forgotten:
</para>
<programlisting>
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 Random')
</programlisting>
<para>
You remember when you first started running supybot and ran
<application>scripts/setup.py</application> and it asked you
all those questions? Well, now's your chance to ask other
users some questions of your own. In our case, with our
<varname>Random</varname> plugin, it might be nice to offer
the user the ability to specify a seed to use whenever the
plugin is loaded. So let's ask him if he wants to do that,
and if so, let's ask him what the seed should be.
</para>
<programlisting>
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 Random')
if yn('Do you want to specify a seed to be used for the RNG')=='y':
seed = something('What seed? It must be an int or long.')
while not seed.isdigit():
print 'That\'s not a valid seed.'
seed = something('What seed?')
onStart.append('seed %s' % seed)
</programlisting>
<para>
As you can see, what the <varname>questions</varname> module
does is fairly self-evident: <function>yn</function> returns
either 'y' or 'n'; <function>something</function> returns
<emphasis>something</emphasis> (but not nothing; for nothing,
you'd want <function>anything</function>). So basically we
ask some questions until we get a good seed. Then we do this
"onStart.append('seed %s' % seed)" doohickey.
<varname>onStart</varname> is a list of the commands to run
when the bot starts; we're just throwing our little piece into
it. These commands will then be written into the template
<application>scripts/setup.py</application> creates for the bot.
</para>
<para>
We've written our own plugin from scratch (well, from the
boilerplate that we got from
<application>scripts/newplugin.py</application> :)) and
survived! Now go write more plugins for supybot, and send
them to me so I can use them too :)
</para>
</sect2>
</sect1>
</article>