Implement LSP code action for disabling rule in configuration

[anderseknert]

The language server should provide a code action to allow developers to disable a rule in .regal/config.yaml via the "Quick fix" menu provided where the error is reported.

If no .regal/config.yaml is found, we should create one.

[anderseknert]

I looked into this briefly last night, and the big challenge here is preserving user comments. These are quite common in .regal/config.yaml files, and they should be! That's a great way to document why some rule is disabled, or configured the way it is. Wiping these as part of a marshalling roundtrip would be terrible, so we'll need to make this a custom process... which makes it non-trivial.

[anderseknert]

Honestly, it's probably easier to just skip parsing altogether, just grep for <category>: and then insert text straight into the document. I mean, just look at this.

[charlieegan3]

https://forum.golangbridge.org/t/modify-yaml-files-using-golang/31838/3 on the other hand looks more hopeful.

[anderseknert]

Yeah, I looked at that but didn’t find a good example like that! It’s worth a shot, although it’s not 100% lossless AFAICS, but perhaps it’s fine to mess a little with whitespace.