Debounce RLS invocations to make it less annoying

[Boscop]

For small projects, RLS calls seem to return almost immediately, but for my current project which currently has ~16000 lines (and transitively depends on 247 crates), whenever I type some Rust code (with RLS enabled), after a few seconds of typing something, RLS shows a warning/error about what I typed like 10 seconds ago which I already fixed (and which wasn't even an error, just an unfinished line), which is very distracting / annoying.

(And on top of that, rls.exe uses 25% CPU all the time (even when I haven't typed anything in several minutes) (making my laptop's fan spin which is annoying, too), but Rust-Enhanced can't do much about that, I guess.)

I think this could be improved by only asking RLS for a check when there was no typing for at least 2 seconds, otherwise it always complains about syntax stuff that wasn't even an error to begin with, just an unfinished code line.

Also, it seems to show some warnings on top that are related to unused functions in other modules etc.
How can I ignore those warnings like dead_code, unused_imports (for RLS only)?

And then, how to make RLS/Rust-Enhanced show the warnings/errors related to the current file at the top of the list?

[jasonwilliams]

Thanks for this feedback @Boscop, i hope to have closer conversations with the RLS team over the next few weeks, months, so this is certainly something we can chat about.

If anything comes up, ill be sure to link it to this issue

[jasonwilliams]

rust-lang/rls#691
rust-lang/rls#688

[Boscop]

Thanks, and where should I put my rls config like

racer_completion = false

Also in rls.toml (in the workspace root folder) like for atom?

[Xanewok]

@Boscop you might want to try also ‚wait_to_build’ (minimum ms from change made to request check build) and ‚build_on_save’ (only request check build when files are saved)

Not sure how configuration is sent to the RLS by the plugin; above options are what’s supported by the RLS