165 lines
5.2 KiB
ReStructuredText
165 lines
5.2 KiB
ReStructuredText
How to write a new module
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=========================
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Introduction
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------------
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Adding a new module to ``bumblebee-status`` is straight-forward:
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- Add a new Python module in ``modules/contrib/``. The name of the
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module will be the name that the user needs to specify when invoking
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``bumblebee-status`` (i.e. a module called
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``modules/contrib/test.py`` will be loaded using
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``bumblebee-status -m test``)
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- See below for how to actually write the module
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- Test (run ``bumblebee-status`` in the CLI)
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- Make sure your changes don’t break anything: ``./coverage.sh``
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- If you want to do me favour, run your module through
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``black -t py34`` before submitting
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Pull requests
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-------------
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The project **gladly** accepts PRs for bugfixes, new functionality, new
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modules, etc. When you feel comfortable with what you’ve developed,
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please just open a PR, somebody will look at it eventually :) Thanks!
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Coding guidelines
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-----------------
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I’m pretty open to whatever style you use, but if it’s all the same to
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you (and yes, I know that the current codebase is only slowly adapting
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to this): - Please favour single quotes for strings (except for
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docstrings, which are always """) - For private methods/variables,
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please use a leading ``__`` (e.g. ``__output`` rather than ``_output``)
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Hello world
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-----------
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This example will show “hello world” in the status bar:
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.. code:: python
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"""Short description in RST format
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please have a look at other modules, this will go into the
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documentation verbatim (list of modules)
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"""
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import core.module
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import core.widget
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class Module(core.module.Module):
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def __init__(self, config):
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super().__init__(config, core.widget.Widget(self.full_text))
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def full_text(self, widgets):
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return 'hello world'
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# vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4
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Of modules and widgets
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----------------------
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There are two important concepts for module writers: - A module is
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something that offers a single set of coherent functionality - A module
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has 1 to n “widgets”, which translates to individual blocks in the i3bar
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Very often, this is a 1:1 relationship, and a single module has a single
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widget. If that’s the case for you, you can stop reading now :)
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Otherwise, you have a number of ways to handle widgets: - During the
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``super().init__(...)`` inside the module’s constructor, you can specify
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a **list** of widgets, and those will comprise the widgets (in ordered
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fashion) - During runtime, you can set a new list of widgets by using
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the ``self.add_widget()`` method of the module to add new widgets and
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``self.clear_widgets()`` method to remove all widgets.
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Adding widgets at runtime
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-------------------------
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If you want to add widgets during runtime, please use the
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``add_widget()`` method of the module:
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::
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def do_something(self):
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self.add_widget(full_text="my sample text", name="<optional name>")
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TODO: expand on this
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Periodic updates
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----------------
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``bumblebee-status`` modules have two different ways to update their
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data: 1. Each interval, the callback registered when the widget was
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created is called. You can do arbitrarily complex things there 2. Each
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interval, **before** the widget’s callback is invoked, a generic
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``update(self, widgets)`` method is called on the **module**
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Largely, where you want to put your update code is up to you. My
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observations: - If you want to change the widgets a module has, you
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**have** to stick with ``update()`` - For simple modules, doing the data
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update in the widget callback is simplest (see ``kernel``, for example)
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Advanced topics
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---------------
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Event handlers
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~~~~~~~~~~~~~~
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The ``core.input`` module can be used to execute callbacks during mouse
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events:
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.. code:: python
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import core.module
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import core.widget
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import core.input
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class Module(core.module.Module):
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@core.decorators.every(minutes=60, seconds=20)
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def __init__(self, config):
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super().__init__(config=config, widgets=<widgets>)
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core.input.register(widget, button=core.input.LEFT_MOUSE, cmd=<cmd>)
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The command can be either a CLI tool that will be directly executed
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(e.g. ``cmd='shutdown -h now'``) or a method that will be executed. The
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method’s signature needs to be: ``def <name>(self, event)``, where
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“event” is the event data provided by i3wm.
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The full list of possible bindings: - LEFT_MOUSE - RIGHT_MOUSE -
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MIDDLE_MOUSE - WHEEL_UP - WHEEL_UP
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Setting a default update interval
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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To change the default update interval, you can use a simple decorator:
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.. code:: python
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import core.module
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import core.widget
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import core.decorators
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class Module(core.module.Module):
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@core.decorators.every(minutes=60, seconds=20)
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def __init__(self, config):
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super().__init__(config=config, widgets=<widgets>)
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**NOTE**: This makes the update interval of the module independent of
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what the user configures via ``-i <interval>``! It is still possible to
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override the module’s interval using ``-p <module>.interval=<value>``,
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however.
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TODOs
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-----
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- default update interval
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- scrolling
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- theme.minwidth
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- scrolling decorator
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- theme.exclude
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- per module update interval -> nice string format
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- update via events
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