Multiplex server for rust-analyzer allows multiple LSP clients (editor
windows) to share a single rust-analyzer instance per cargo workspace.
The project two binaries, ra-multiplex which is a thin wrapper that acts like
rust-analyzer but only connects to a TCP socket at 127.0.0.1:27631 and
pipes stdin and stdout to it.
The second binary ra-multiplex-server will listen on :27631 and spawn the
rust-analyzer server, but depending on the working directory the
ra-multiplex client was spawned from it might reuse an already spawned
rust-analyzer instance.
Because this is not really a supported mode of operation by either LSP or
rust-analyzer itself the ra-multiplex-server caches some messages and
modifies request/response ids in order to make most of LSP work.
The project is still work in progress so it'll probably block some LSP
functionality or break randomly or something, but it was tested and works well
enough with coc-rust-analyzer client in neovim, it should theoretically work
with other clients and editors too. If you have problems you're welcome to open
issues on this repository.
Build the project with
sh
$ cargo build --release
Run the ra-multiplex-server, make sure that rust-analyzer is in your
PATH, with optional logging.
sh
$ which rust-analyzer
/home/user/.cargo/bin/rust-analyzer
$ RUST_LOG=info target/release/ra-multiplex-server
Configure your editor to use ra-multiplex as rust-analyzer, for example for
CoC in neovim edit ~/.config/nvim/coc-settings.json, add:
json
{
"rust-analyzer.serverPath": "/path/to/ra-multiplex",
}