darker VS formatter.nvim

Thanks for your suggestions. I have gone through the GitHub issue that you have mentioned. From there I got to know about this plugin https://github.com/akaihola/darker

For Python, Darker does that by applying Black only to changed areas of the code. Maybe the same approach could be used for rustfmt by creating a separate tool?

Not an answer to your question but in the specific case of black you can instead use: https://github.com/akaihola/darker

For instance, we have a number of interesting features planned for the 1.5.0 release of Darker, a tool for running Black/isort/pylint/flake8 but limiting to only lines modified between two given Git commits.

I knew one library using "composite". - Darker: https://github.com/akaihola/darker/blob/master/action.yml - More details here: https://docs.github.com/en/actions/creating-actions/creating-a-composite-action

There's also Darker for only reformatting (using Black) the lines modified by commits.

Assuming the range you're interested in is a range with your changes, you should look at darker.

Yeah that's how we've used it. The results need manual checking, but together with darker https://github.com/akaihola/darker that's how we've been slowly ratcheting our Django monolith into a typed codebase.

Can anyone explain why someone would use null-ls if you're using the modern lsp setup (say, from kickstart.nvim). I see comments mentioning formatting. I see formatters mentioned several times. Why not just use https://github.com/mhartington/formatter.nvim?

I use null-ls (https://github.com/jose-elias-alvarez/null-ls.nvim), I haven't tried it for python, but haven't had trouble with lua, js, ts or rust. You can also look into formatter.nvim (https://github.com/mhartington/formatter.nvim).

I use formatter.nvim for formatting

For formatting, formatter.nvim is a good choice and has similar setup to nvim-lint.

I finally installed this formatter plugin and configured it to execute de clang-format command like this

mhartington/formatter.nvim is used for automatic code formatting. Its configuration also shows how to use nvim_create_augroup and nvim_create_autocmd from Lua.

This might have something to do with extmarks being clobbered when the new text is written. For example, here is a GitHub issue describing the problem: https://github.com/mhartington/formatter.nvim/issues/22 This is for formatter.nvim, but this would likely apply to any process that rewrites the whole buffer.

i have always had trouble with lsp formatting and null-ls (may just be me, i'm not super clued in) so i use formatter.nvim https://github.com/mhartington/formatter.nvim/

Take a look at formatter.nvim

I've had really good experience with formatter-nvim.