# sync-ls
Sync LSP server inspired by async-lsp, primarily for tinymist. The author of this crate thinks that async-lsp is better than sync-ls, so please use async-lsp whenever possible unless you have a good reason to use sync-ls. Some random points:
- The `req_queue` and `transport` are extracted from the rust-analyzer project.
- The sync-ls should have better performance on stdio transport than async-lsp, especially on windows, but the author have forgotten the idea.
- The sync-ls handlers can get a mutable reference to the state, which is not possible in `tower-lsp`.
- The sync-ls supports both LSP and DAP with a common codebase.
## Debugging with input mirroring
You can record the input during running the editors with binary. You can then replay the input to debug the language server.
```sh
# Record the input
your-ls --mirror input.txt
# Replay the input
your-ls --replay input.txt
```
This is much more useful when devloping a dap server.
## Usage
Starts a LSP server with stdio transport:
```rust
LspBuilder::new(args, client.weak())
// Adds request handlers
.with_request::<Shutdown>(State::shutdown)
// Adds event handlers
.with_event(&LspInterrupt::Settle, State::interrupt)
.build()
.start(conn.receiver, is_replay)
})?;
```