add toml formatter for pyproject.toml

[AlexandreKempf]

• ❗ I have followed the Contributing to DVCLive guide.

• 📖 If this PR requires documentation updates, I have created a separate PR (or issue, at least) in dvc.org and linked it here.

[dberenbaum]

Thanks @AlexandreKempf! We try to simplify maintenance and consistency by using a single template for our projects in https://github.com/iterative/py-template. Any project setup ideas you have should probably go there instead of directly into dvclive.

[AlexandreKempf]

Ah! I understand now why it was not using a formatter already.
We cannot use a pre-commit formatter on cookie-cutter projects because the TOML/YAML files are not valid TOML/YAML before the project is initiated.
We can keep it for this repo, or we can remove it, as you prefer ;)

[dberenbaum]

@AlexandreKempf Good point, but unless I'm missing something, I still think you could add the changes back to that cookiecutter manually so that:

1. The formatting will be fixed in the template
2. The generated projects will inherit the pre-commit formatter

[AlexandreKempf]

@dberenbaum I'm wondering if I get you right. Or maybe I wasn't clear enough in my comment.
If I add the formatters in the py-template's pre-commit, it will try to pre-commit the py-template project. Or there are plenty of toml files that are not valid for the formatter (stuff like {%- if cookiecutter.docs != "False" %}), and at the end, the project refuses to commit my changes.

Is there something I'm missing? What did you have in mind exactly?

[dberenbaum]

It might be my misunderstanding since I haven't tried it. Are you putting it inside or outside the cookiecutter? Does it run the pre-commit inside the cookiecutter?

[AlexandreKempf]

Oh my mistake! I putted it outside :( Thanks for the explanation.
I'm doing the PR on py-template :)