Hello! Curious if anyone has made a plugin for

./pants fmt ::

to run

black

over Jupyter Notebooks. Haven't dipped my toes into plugins just yet but feel this might be a decent starting point.

Hi! Not that I'm aware of - it should be pretty easy to copy & paste the current rule to get this working. Ideally we would instead give you a way to hook into the current rule rather than duplicating it, but should work First step would be figuring out how to model this w/ targets. Do you only want to run Black on notebooks? Or other things like Flake8 and MyPy?

Thanks! I'm thinking of starting with Black just because I know it is supported. But in theory I'd love to be able to run Flake8 and MyPy over them as well. I suspect those won't be as straightforward or at least not accomplished without additional packages.

Cool. First step is creating a new target https://www.pantsbuild.org/docs/target-api-concepts I recommend that you have one target per notebook, meaning you use

SingleSourceField

rathher than

MultipleSourcesField

😎 Alright, off and running. Thanks

my main question will be how much to integrate into Python ecosystem like whether to subclass

PythonSourceField

. For now, I think keeping this simple and disjoint is a good idea. You can add coupling later - start w/ simplest for now