How to use configuration found in `.rustfmt.toml` when running Rust format?

[MitchTurner]

• rust.vim version: Whatever comes automatically by including "rust-lang/rust.vim" in my plugins.lua file
• nvchad distro of Neovim.

Steps to reproduce:

In my plugin directory I currently have:

  {
    "rust-lang/rust.vim",
    ft = "rust",
    init = function ()
      vim.rustfmt_options = "+nightly"
      vim.g.rustfmt_autosave = 1
    end
  },

This is working inasmuch as it's reformatting my code on save.

However, it's ignoring the configurations I have set in the .rustfmt.toml in the parent directory.

For example:

imports_layout = "Vertical"

should result in the imports being stacked, but the formatting from rust.vim is undoing that.

Expected vs. actual behavior:

This isn't a bug as much as a gap in my knowledge. I'd hope to find a solution that recognizes my .rustfmt.toml and includes the configuration. Perhaps I could include a lua script that checks if it exists and includes it in the rustfmt_options?

[MitchTurner]

It looks like you are in fact doing a search for it:

rust.vim/autoload/rustfmt.vim

Lines 63 to 76 in 889b9a7

	function! s:RustfmtConfigOptions()
	let l:rustfmt_toml = findfile('rustfmt.toml', expand('%:p:h') . ';')
	if l:rustfmt_toml !=# ''
	return '--config-path '.shellescape(fnamemodify(l:rustfmt_toml, ":p"))
	endif
	let l:_rustfmt_toml = findfile('.rustfmt.toml', expand('%:p:h') . ';')
	if l:_rustfmt_toml !=# ''
	return '--config-path '.shellescape(fnamemodify(l:_rustfmt_toml, ":p"))
	endif
	" Default to edition 2018 in case no rustfmt.toml was found.
	return '--edition 2018'
	endfunction

So there must be something else wrong with my config. Or possibly related to how I'm invoking +nightly.

[awused]

I noticed this recently, due to a change in nightly rustfmt that breaks formatting let chains with earlier editions set. rust.vim fails to find my global rustfmt config and then forces --edition=2018, which is really unpleasant and overrides my explicit config. Since rust.vim seems unmaintained, I just edited it locally.