Using a different language server for code inside a proc macro

[rajesh-rahul]

I would like to write a language server for SQLite sql that will also work for SQL written in a particular proc macro:

// ...rust code
let users = my_proc_macro_for_sql! {
    SELECT * FROM User
};
// ...rust code

Before I venture further, I wanted to ask if something like is even possible in a non-invasive manner.

Some approaches I thought of:

• Using https://code.visualstudio.com/api/language-extensions/embedded-languages
  • This seems to indicate that rust-analyzer may need to add some kind of support for this. If so, is this something rust-analyzer interested in supporting? Maybe this is already supported? If not, I can attempt to make this contribution.
• A language server that targets .rs files but only "activates" when there is a specific .toml file in the workspace and the .rs file contains the proc macro my_proc_macro_for_sql!
  • This seems like it could potentially clash with rust analyzer and/or slow down ide needlessly