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=============================
Extending Pybtex with plugins
=============================
.. contents::
:local:
Pybtex uses plugins for bibliography data formats, output markup formats and
bibliography formatting styles. This allows to add new formats or styles to
Pybtex withoud modifying Pybtex itself.
The plugins are based on `Setuptools' entry points <Setuptools' documentation_>`_.
Entry points
============
Here is the list of entry points supported by Pybtex.
pybtex.database.input
---------------------
This entry point is used for bibliography parsers.
Must point to a subclass of :py:class:`pybtex.database.input.BaseParser`.
There is also an additional entry point called ``pybtex.database.output.suffixes``.
It is used for registering bibliography formats for specific file suffixes
(like BibTeX for :file:`.bib` files).
For example, a JSON input plugin could use these entry points:
.. sourcecode:: ini
[pybtex.database.input]
json = pybtexjson:JSONParser
[pybtex.database.input.suffixes]
.json = pybtexjson:JSONParser
pybtex.database.output
----------------------
This entry poing is used for bibliography writers.
Must point to a subclass of :py:class:`pybtex.database.output.BaseWriter`.
There is also an additional entry point called ``pybtex.database.output.suffixes``.
It is used for registering default plugins for specific file suffixes in the
same way as ``pybtex.database.input.suffixes`` described above.
pybtex.backends
---------------
This entry point is for adding new output markup formats for Pythonic bibliography
styles. The built-in plugins are ``latex``, ``html``, ``markdown``, and ``plaintext``.
Must point to a :py:class:`pybtex.backends.BaseBackend` subclass.
pybtex.style.formatting
-----------------------
This is the entry point for Pythonic bibliography styles. Must point to a
:py:class:`pybtex.style.formatting.BaseStyle` subclass.
pybtex.style.labels
-------------------
Label styles for Pythonic bibliography styles.
pybtex.style.names
------------------
Name styles for Pythonic bibliography styles.
pybtex.style.sorting
--------------------
Sorting styles for Pythonic bibliography styles.
Registering plugins
===================
See `Setuptools' documentation`_.
.. _Setuptools' documentation: https://setuptools.readthedocs.io/en/latest/userguide/quickstart.html#entry-points-and-automatic-script-creation
Example plugins
===============
An example project directory with two simple plugins and a ``setup.py`` file can
be found in the :source:`examples/sample_plugins` subdirectory.
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