Include some formatter default `[runtime_]condition`s

[barrett-ruth]

Issues

• [X] I have checked existing issues and there are no existing ones with the same request.

Feature description

Some formatters (i.e. cbfmt):

• only have one possible name for their config file
• must have the config file to run

Currently, cbfmt will attach to every markdown/org buffer. In this case I believe it makes sense to conditionally attach if .cbfmt.toml for example, exists.

However, I understand that [runtime_]condition have overhead- even though it'll just be checking for a single file.

That or, I can just write a PR to BUILTINS.md including the condition function beneath cbfmt. That may be the simpler solution.

Help

Yes

Implementation help

No response

[mochaaP]

I believe it should be possible to do this with the condition key:

null_ls.builtins.formatting.cbfmt.with({
        -- cbfmt requires a config file
        condition = function(utils)
            return utils.root_has_file(".cbfmt.toml")
        end,
})

Maybe I should add it to cbfmt's docs.

[barrett-ruth]

Yes, my question was about where that should be the default - included in the generator

[mochaaP]

This should work - please test it. :)

[barrett-ruth]

Brilliant works perfectly @mochaaP thanks for catching treefmt or whatever the other one as well. Feel free to merge and close