e16c76e3c3
This makes code more readale and concise,
moving all format arguments like `format!("{}", foo)`
into the more compact `format!("{foo}")` form.
The change was automatically created with, so there are far less change
of an accidental typo.
```
cargo clippy --fix -- -A clippy::all -W clippy::uninlined_format_args
```
122 lines
4.1 KiB
Rust
122 lines
4.1 KiB
Rust
//! A minimal example LSP server that can only respond to the `gotoDefinition` request. To use
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//! this example, execute it and then send an `initialize` request.
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//!
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//! ```no_run
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//! Content-Length: 85
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//!
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//! {"jsonrpc": "2.0", "method": "initialize", "id": 1, "params": {"capabilities": {}}}
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//! ```
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//!
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//! This will respond with a server response. Then send it a `initialized` notification which will
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//! have no response.
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//!
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//! ```no_run
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//! Content-Length: 59
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//!
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//! {"jsonrpc": "2.0", "method": "initialized", "params": {}}
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//! ```
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//!
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//! Once these two are sent, then we enter the main loop of the server. The only request this
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//! example can handle is `gotoDefinition`:
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//!
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//! ```no_run
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//! Content-Length: 159
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//!
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//! {"jsonrpc": "2.0", "method": "textDocument/definition", "id": 2, "params": {"textDocument": {"uri": "file://temp"}, "position": {"line": 1, "character": 1}}}
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//! ```
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//!
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//! To finish up without errors, send a shutdown request:
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//!
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//! ```no_run
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//! Content-Length: 67
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//!
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//! {"jsonrpc": "2.0", "method": "shutdown", "id": 3, "params": null}
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//! ```
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//!
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//! The server will exit the main loop and finally we send a `shutdown` notification to stop
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//! the server.
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//!
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//! ```
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//! Content-Length: 54
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//!
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//! {"jsonrpc": "2.0", "method": "exit", "params": null}
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//! ```
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use std::error::Error;
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use lsp_types::OneOf;
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use lsp_types::{
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request::GotoDefinition, GotoDefinitionResponse, InitializeParams, ServerCapabilities,
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};
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use lsp_server::{Connection, ExtractError, Message, Request, RequestId, Response};
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fn main() -> Result<(), Box<dyn Error + Sync + Send>> {
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// Note that we must have our logging only write out to stderr.
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eprintln!("starting generic LSP server");
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// Create the transport. Includes the stdio (stdin and stdout) versions but this could
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// also be implemented to use sockets or HTTP.
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let (connection, io_threads) = Connection::stdio();
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// Run the server and wait for the two threads to end (typically by trigger LSP Exit event).
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let server_capabilities = serde_json::to_value(&ServerCapabilities {
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definition_provider: Some(OneOf::Left(true)),
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..Default::default()
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})
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.unwrap();
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let initialization_params = connection.initialize(server_capabilities)?;
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main_loop(connection, initialization_params)?;
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io_threads.join()?;
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// Shut down gracefully.
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eprintln!("shutting down server");
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Ok(())
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}
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fn main_loop(
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connection: Connection,
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params: serde_json::Value,
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) -> Result<(), Box<dyn Error + Sync + Send>> {
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let _params: InitializeParams = serde_json::from_value(params).unwrap();
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eprintln!("starting example main loop");
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for msg in &connection.receiver {
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eprintln!("got msg: {msg:?}");
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match msg {
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Message::Request(req) => {
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if connection.handle_shutdown(&req)? {
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return Ok(());
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}
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eprintln!("got request: {req:?}");
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match cast::<GotoDefinition>(req) {
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Ok((id, params)) => {
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eprintln!("got gotoDefinition request #{id}: {params:?}");
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let result = Some(GotoDefinitionResponse::Array(Vec::new()));
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let result = serde_json::to_value(&result).unwrap();
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let resp = Response { id, result: Some(result), error: None };
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connection.sender.send(Message::Response(resp))?;
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continue;
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}
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Err(err @ ExtractError::JsonError { .. }) => panic!("{err:?}"),
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Err(ExtractError::MethodMismatch(req)) => req,
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};
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// ...
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}
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Message::Response(resp) => {
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eprintln!("got response: {resp:?}");
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}
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Message::Notification(not) => {
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eprintln!("got notification: {not:?}");
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}
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}
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}
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Ok(())
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}
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fn cast<R>(req: Request) -> Result<(RequestId, R::Params), ExtractError<Request>>
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where
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R: lsp_types::request::Request,
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R::Params: serde::de::DeserializeOwned,
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{
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req.extract(R::METHOD)
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}
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