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Add documentation around plugin notifications and pyflakes

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Ian Cordasco 2016-02-01 20:33:18 -06:00
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docs/source/internal/plugin_handling.rst
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@ -56,6 +56,33 @@ These are used to interact with each of the types of plugins individually.
Notifying Listener Plugins
--------------------------
One of the interesting challenges with allowing plugins to be notified each
time an error or warning is emitted by a checker is finding listeners quickly
and efficiently. It makes sense to allow a listener to listen for a certain
class of warnings or just a specific warning. As such, we need to allow all
plugins that listen to a specific warning or class to be notified. For
example, someone might register a listener for ``E1`` and another for ``E111``
if ``E111`` is triggered by the code, both listeners should be notified.
If ``E112`` is returned, then only ``E1`` (and any other listeners) would be
notified.
To implement this goal, we needed an object to store listeners in that would
allow for efficient look up - a Trie (or Prefix Tree). Given that none of the
existing packages on PyPI allowed for storing data on each node of the trie,
it was left up to write our own as :class:`~flake8.plugins._trie.Trie`. On
top of that we layer our :class:`~flake8.plugins.notifier.Notifier` class.
Now when Flake8 receives an error or warning, we can easily call the
:meth:`~flake8.plugins.notifier.Notifier.notify` method and let plugins act on
that knowledge.
Default Plugins
---------------
Finally, Flake8 has always provided its own plugin shim for Pyflakes. As part
of that we carry our own shim in-tree and now store that in
:mod:`flake8.plugins.pyflakes`.
API Documentation
-----------------
@ -76,6 +103,10 @@ API Documentation
.. autoclass:: flake8.plugins.manager.ReportFormatters
.. autoclass:: flake8.plugins.notifier.Notifier
.. autoclass:: flake8.plugins._trie.Trie
.. |PluginManager| replace:: :class:`~flake8.plugins.manager.PluginManager`
.. |Plugin| replace:: :class:`~flake8.plugins.manager.Plugin`
.. |PTM| replace:: :class:`~flake8.plugins.manager.PluginTypeManager`