Simple framework for creating IRC bots.

Example

init.py:

from pyromancer.objects import Pyromancer

p = Pyromancer('test.settings')
p.run()

test/settings.py:

host = '1.2.3.4'
port = 6667
nick = 'PyromancerBot'
encoding = 'ISO-8859-1'

Custom commands

Writing own commands is fairly simple. Create a folder which will be the package name, with a file named commands.py in it to hold the commands. In commands.py, you can register functions to be a command with the built-in command decorator.

Example

File layout:

test/
    __init__.py
    commands.py
    settings.py
init.py

commands.py:

from pyromancer.decorators import command


@command(r'bye (.*)')
def bye(match):
    return 'Bye {m[1]}!'

On IRC:

<User> bye everyone
<Bot> Bye everyone!

Pyromancer scans automatically for functions decorated using the commands decorator, so all your commands in commands.py are used automatically.

You can also create a directory named commands with submodules containing the commands. Just make sure that you import either the modules or all of the commands in the __init__.py file.

The command decorator

You must apply this to a function to mark it as a command. It will be used when scanning for and collecting commands.

Parameters

• patterns - a regular expression or a list of expressions. When a list is given, all patterns are attempted when matching the input, and only when all patterns in the list fail to match, the command is not executed.

@command(['hi', 'hello'])
def hi(match):
    return 'Hello!'

• prefix - a boolean which defaults to True. When true, the command pattern is only attempted to match when the message line starts with the prefix defined in the settings of the bot. This is useful for commands which are very bot-like (in contrary to commands which look and behave like natural language). Using a boolean and a setting allows the same command to be triggered in different ways, depending on the settings of the bot which installed the command package.

• raw - a boolean which defaults to False. When true, the raw input line sent from the server is used for matching the pattern, instead of the message. Useful for matching lines which are not a message from an user, such as nick or topic changes.

Messaging from a command

Messaging from inside the function which makes up the command is as easy as can be for simple use cases, but can be done in numerous ways for the more complex situations.

Most of the times, arguments are passed to the Match.msg function, which applies formatting by default and provides some additional utilities. The most important of those is that when no target has been passed on as an argument, it will use either the channel or the user (in case of a PM) whose input line triggered the command to be executed as the target, effectively replying.

Parameters

• message - the message to be send to the server. Formatting will be applied using any additional args and kwargs, so you can apply the full power of the Python Format Mini-Language on the message.

• args and kwargs - arguments to be passed on through the formatting which is applied on message.

Methods of messaging

• Return a message

@command(r'bye (.*)')
def bye(match):
    return 'Bye {m[1]}!'

• Return a tuple of message and optional args and kwargs to be used when formatting message. args can be both a list of arguments, or simply all the middle elements of the tuple.

def gibberish(match):
    return 'A = {}, B = {}, C = {c_char}', 'a', 'b', {'c_char': 'c'}

• Yield a message or a tuple of message and optional args and kwargs. Yielding can be done as much as you want, which is the easiest way of sending multiple messages from one command.

@command(r'say (.*)')
def say(match):
    for part in match[1].split(', '):
        yield 'Saying {}', part

• Return a list of message or a tuple of message and optional args and kwargs.

def hi(match):
    return ['Hi', 'Hello']

• Use Match.msg. This is the only way to benefit from the non-default functionalities provided by this function.

def raw(match):
    match.msg('Raw {} message {m[1]}', raw=True)

Extra parameters for Match.msg

• target - the target to send the message to. If not provided, it will attempt to use either the channel or user whose input line triggered the command, which effectively results in replying.

• raw - defaults to False. When true, no formatting is applied on message.

Timers

You can register timers in a custom timers module, or you can create them from inside commands or other timers. When creating or registering a timer, you can either specify a timedelta or datetime object to schedule the timer. When specifying a timedelta, you can also specify the amount of times the timer should execute, which defaults to infinite. Timers can send messages based on arguments given upon initialization, but also call a callable which in itself can send messages or initialize new timers.

When messaging from a timer, you must always specify a target to send the message to before the message (when returning a message tuple), or with the target argument on the Match instance when using the Match.msg method. Because there is no line which triggered the timer, nothing can be used to decide where to send the message to when the target is not specified.

Example of timers through a module

timers.py:

from datetime import datetime, timedelta

from pyromancer.decorators import timer


@timer(timedelta(seconds=3), count=5)
def say_time(match):
    return 'User', "It's {}", datetime.now()

Example of timers through messaging

commands.py:

from datetime import datetime, timedelta

from pyromancer.decorators import timer


@command(r'start_timer')
def start_timer(match):
    return timedelta(seconds=3), 'User', "It's {}", datetime.now()

You can also return a Timer instance, or specify a callable as the second item of the returned tuple, which is then called like any function with the timer decorator.

Using a database

Using a database requires SQLAlchemy.

To enable the integrated database support, you have to set the database setting to a string which holds the URL to the database, as accepted by SQLAlchemy's create_engine function. Then, in a models module, you can import the declarative base to construct your model, and import the Session for querying.

Example with a simple model and timer

This example creates a table named test in a SQLite test.db file, and creates an entry with the current date and time every three seconds, and a command which returns the count of entries in the table.

settings.py:

database = 'sqlite:///test.db'

models.py:

from sqlalchemy import Column, DateTime, Integer

from pyromancer.database import Base


class Test(Base):
    __tablename__ = 'test'

    id = Column(Integer, primary_key=True)
    value = Column(DateTime)

timers.py:

from datetime import datetime, timedelta

from pyromancer.database import Session
from pyromancer.decorators import timer

from .models import Test


@timer(timedelta(seconds=3))
def hi(match):
    session = Session()
    session.add(Test(value=datetime.now()))
    session.commit()

commands.py:

from pyromancer.database import Session
from pyromancer.decorators import command

from .models import Test


@command(r'timers')
def timers(match):
    session = Session()
    return 'Timer count: {}', session.query(Test).count()

Support

Python 2.7 and 3.0 - 3.4 are supported. Note that development occurs on Python 3.

To do

• Figure out how to do translation of messages through the Match.msg function.

Changelist

1.0 - 2014-10-18

• Add timers.
• Add integrated database support.
• Add command module which tracks channels and users.
• Change color code parameter in message formatting to c (was k by mistake).
• Dropped [irc][1] as a dependency.
• Switch to MIT license. [1]: https://pypi.python.org/pypi/irc

0.4 - 2014-03-30

• Add support for Python 2.7.
• Add more tests.
• Fix messaging with positional arguments given as a list not working.
• Add ability to create commands for raw code lines by specifying a code to match.
• Add ability to do easy message formatting for colored, underlined and bold text.

0.3 - 2014-03-22

• Change settings to be a Python module instead of a dictionary.
• Change package loading.
• Enable the commands from the package of which the settings are in by default.
• Add ability to process raw input lines.
• Add option to use precompiled regular expressions in the command decorator.
• Add option to pass flags for compiling the regular expressions in the command decorator.
• Fix returning message from command not working.

0.2 - 2014-03-14

• Add tests.
• Add multiple and easier ways to send messages from a command.
• Add support for multiple patterns for the same command.
• Add a configurable command prefix setting for the more bot-like commands.
• Trying to access a word in a Line now correctly returns an empty string when the index does not exist.
• Fix passing positional arguments to Match.msg not working properly.

0.1 - 2013-11-17

• Initial release.