mod transport; use transport::{Payload, Transport}; // use std::collections::HashMap; use jsonrpc_core as jsonrpc; use lsp_types as lsp; use serde_json::Value; use serde::{Deserialize, Serialize}; use smol::prelude::*; use smol::{ channel::{Receiver, Sender}, io::{BufReader, BufWriter}, process::{Child, ChildStderr, Command, Stdio}, Executor, }; /// A type representing all possible values sent from the server to the client. #[derive(Debug, PartialEq, Clone, Deserialize, Serialize)] #[serde(deny_unknown_fields)] #[serde(untagged)] enum Message { /// A regular JSON-RPC request output (single response). Output(jsonrpc::Output), /// A notification. Notification(jsonrpc::Notification), /// A JSON-RPC request Call(jsonrpc::Call), } #[derive(Debug, PartialEq, Clone)] pub enum Notification { PublishDiagnostics(lsp::PublishDiagnosticsParams), } impl Notification { pub fn parse(method: &str, params: jsonrpc::Params) -> Notification { use lsp::notification::Notification as _; match method { lsp::notification::PublishDiagnostics::METHOD => { let params: lsp::PublishDiagnosticsParams = params .parse() .expect("Failed to parse PublishDiagnostics params"); // TODO: need to loop over diagnostics and distinguish them by URI Notification::PublishDiagnostics(params) } _ => unimplemented!("unhandled notification: {}", method), } } } pub struct Client { process: Child, stderr: BufReader, outgoing: Sender, pub incoming: Receiver, pub request_counter: u64, capabilities: Option, // TODO: handle PublishDiagnostics Version // diagnostics: HashMap>, } impl Client { pub fn start(ex: &Executor, cmd: &str, args: &[String]) -> Self { let mut process = Command::new(cmd) .args(args) .stdin(Stdio::piped()) .stdout(Stdio::piped()) .stderr(Stdio::piped()) .spawn() .expect("Failed to start language server"); // smol makes sure the process is reaped on drop, but using kill_on_drop(true) maybe? // TODO: do we need bufreader/writer here? or do we use async wrappers on unblock? let writer = BufWriter::new(process.stdin.take().expect("Failed to open stdin")); let reader = BufReader::new(process.stdout.take().expect("Failed to open stdout")); let stderr = BufReader::new(process.stderr.take().expect("Failed to open stderr")); let (incoming, outgoing) = Transport::start(ex, reader, writer); Client { process, stderr, outgoing, incoming, request_counter: 0, capabilities: None, // diagnostics: HashMap::new(), } } fn next_request_id(&mut self) -> jsonrpc::Id { let id = jsonrpc::Id::Num(self.request_counter); self.request_counter += 1; id } fn to_params(value: Value) -> anyhow::Result { use jsonrpc::Params; let params = match value { Value::Null => Params::None, Value::Bool(_) | Value::Number(_) | Value::String(_) => Params::Array(vec![value]), Value::Array(vec) => Params::Array(vec), Value::Object(map) => Params::Map(map), }; Ok(params) } pub async fn request( &mut self, params: R::Params, ) -> anyhow::Result where R::Params: serde::Serialize, R::Result: core::fmt::Debug, // TODO: temporary { let params = serde_json::to_value(params)?; let request = jsonrpc::MethodCall { jsonrpc: Some(jsonrpc::Version::V2), id: self.next_request_id(), method: R::METHOD.to_string(), params: Self::to_params(params)?, }; let (tx, rx) = smol::channel::bounded::>(1); self.outgoing .send(Payload::Request { chan: tx, value: request, }) .await?; let response = rx.recv().await??; let response = serde_json::from_value(response)?; // TODO: we should pass request to a sender thread via a channel // so it can't be interleaved // TODO: responses can be out of order, we need to register a single shot response channel Ok(response) } pub async fn notify( &mut self, params: R::Params, ) -> anyhow::Result<()> where R::Params: serde::Serialize, { let params = serde_json::to_value(params)?; let notification = jsonrpc::Notification { jsonrpc: Some(jsonrpc::Version::V2), method: R::METHOD.to_string(), params: Self::to_params(params)?, }; self.outgoing .send(Payload::Notification(notification)) .await?; Ok(()) } // ------------------------------------------------------------------------------------------- // General messages // ------------------------------------------------------------------------------------------- pub async fn initialize(&mut self) -> anyhow::Result<()> { // TODO: delay any requests that are triggered prior to initialize #[allow(deprecated)] let params = lsp::InitializeParams { process_id: Some(u64::from(std::process::id())), root_path: None, // root_uri: Some(lsp_types::Url::parse("file://localhost/")?), root_uri: None, // set to project root in the future initialization_options: None, capabilities: lsp::ClientCapabilities::default(), trace: None, workspace_folders: None, client_info: None, }; let response = self.request::(params).await?; self.capabilities = Some(response.capabilities); // next up, notify self.notify::(lsp::InitializedParams {}) .await?; Ok(()) } pub async fn shutdown(&mut self) -> anyhow::Result<()> { self.request::(()).await } pub async fn exit(&mut self) -> anyhow::Result<()> { self.notify::(()).await } // ------------------------------------------------------------------------------------------- // Text document // ------------------------------------------------------------------------------------------- pub async fn text_document_did_open( &mut self, state: &helix_core::State, ) -> anyhow::Result<()> { self.notify::(lsp::DidOpenTextDocumentParams { text_document: lsp::TextDocumentItem { uri: lsp::Url::from_file_path(state.path().unwrap()).unwrap(), language_id: "rust".to_string(), // TODO: hardcoded for now version: 0, text: String::from(&state.doc), }, }) .await } // TODO: trigger any time history.commit_revision happens pub async fn text_document_did_change( &mut self, state: &helix_core::State, ) -> anyhow::Result<()> { self.notify::(lsp::DidChangeTextDocumentParams { text_document: lsp::VersionedTextDocumentIdentifier::new( lsp::Url::from_file_path(state.path().unwrap()).unwrap(), 0, // TODO: version ), content_changes: vec![], // TODO: }) .await } pub async fn text_document_did_close(&mut self) -> anyhow::Result<()> { unimplemented!() } // will_save / will_save_wait_until pub async fn text_document_did_save(&mut self) -> anyhow::Result<()> { unimplemented!() } }