tests: Big push to get the tests to pass again. - Lots of fixes everywhere in the code. - Try to handle debug logging in the multiprocessing worker pool when running in pytest. Not perfect, but usable for now. - Replace all `.md` test files with `.html` since now a auto-format extension always sets the format. - Replace `out` with `outfiles` in most places since now blog archives are added to the bake output and I don't want to add expected outputs for blog archives everywhere.

---
title: Code
---

PieCrust can be extended with plugins in order to support additional features
such as new [formatters][1], [processors][2], or [template engines][3] (among
other things).

[Creating a plugin][4] is very easy in itself, but requires making a
`setuptools` package in order to be easily shared with other people.


[1]: {{docurl('content/formatters')}}
[2]: {{docurl('asset-pipeline')}}
[3]: {{docurl('content/templating')}}
[4]: {{apiurl('plugins')}}