Proposal: .language-servers.toml file

[nik-rev]

There should be an editor-agnostic way of configuring language servers. We can do this using a custom file, .language-servers.toml, the format of which will be explained below

Example use-case

Today, I wanted to use nightly rustfmt with stable rust, and have my editor (Helix) automatically format Rust files using nightly rustfmt. To do this, I have to add +nightly to rustfmt argument in the rust-analyzer language server as follows:

[language-server.rust-analyzer.config]
rustfmt.extraArgs = "+nightly"

Contributors to my project will need to have a custom config file created for them (e.g. .vscode/*, .zed/*) to configure rust-analyzer in a similar fashion to how it is done in Helix

In the end we will need to have a separate config file for every editor to properly work. This is pretty cumbersome, so it would be nice to have a single file that any editor can read.

.language-servers.toml file

Example format:

[rust-analyzer.config]
extraArgs = "+nightly"

The editor will then pass the config to the appropriate language server.

All configuration options are listed under the [${language-server}.config] field