use crate::{ transport::{Payload, Transport}, Call, Error, }; type Result = core::result::Result; use helix_core::{ChangeSet, Transaction}; use helix_view::Document; // use std::collections::HashMap; use std::sync::atomic::{AtomicU64, Ordering}; use jsonrpc_core as jsonrpc; use lsp_types as lsp; use serde_json::Value; use smol::{ channel::{Receiver, Sender}, io::{BufReader, BufWriter}, // prelude::*, process::{Child, ChildStderr, Command, Stdio}, Executor, }; fn text_document_identifier(doc: &Document) -> lsp::TextDocumentIdentifier { lsp::TextDocumentIdentifier::new(lsp::Url::from_file_path(doc.path().unwrap()).unwrap()) } pub struct Client { _process: Child, stderr: BufReader, outgoing: Sender, // pub incoming: Receiver, pub request_counter: AtomicU64, capabilities: Option, // TODO: handle PublishDiagnostics Version // diagnostics: HashMap>, } impl Client { pub fn start(ex: &Executor, cmd: &str, args: &[String]) -> (Self, Receiver) { 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); let client = Client { _process: process, stderr, outgoing, // incoming, request_counter: AtomicU64::new(0), capabilities: None, // diagnostics: HashMap::new(), }; // TODO: async client.initialize() // maybe use an arc flag (client, incoming) } fn next_request_id(&self) -> jsonrpc::Id { let id = self.request_counter.fetch_add(1, Ordering::Relaxed); jsonrpc::Id::Num(id) } fn to_params(value: Value) -> 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) } /// Execute a RPC request on the language server. pub async fn request(&self, params: R::Params) -> 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 .map_err(|e| Error::Other(e.into()))?; let response = rx.recv().await.map_err(|e| Error::Other(e.into()))??; 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) } /// Send a RPC notification to the language server. pub async fn notify(&self, params: R::Params) -> 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 .map_err(|e| Error::Other(e.into()))?; Ok(()) } /// Reply to a language server RPC call. pub async fn reply( &self, id: jsonrpc::Id, result: core::result::Result, ) -> Result<()> { use jsonrpc::{Failure, Output, Success, Version}; let output = match result { Ok(result) => Output::Success(Success { jsonrpc: Some(Version::V2), id, result, }), Err(error) => Output::Failure(Failure { jsonrpc: Some(Version::V2), id, error, }), }; self.outgoing .send(Payload::Response(output)) .await .map_err(|e| Error::Other(e.into()))?; Ok(()) } // ------------------------------------------------------------------------------------------- // General messages // ------------------------------------------------------------------------------------------- pub async fn initialize(&mut self) -> Result<()> { // TODO: delay any requests that are triggered prior to initialize #[allow(deprecated)] let params = lsp::InitializeParams { process_id: Some(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::default() }, trace: None, workspace_folders: None, client_info: None, locale: None, // TODO }; let response = self.request::(params).await?; self.capabilities = Some(response.capabilities); // next up, notify self.notify::(lsp::InitializedParams {}) .await?; Ok(()) } pub async fn shutdown(&self) -> Result<()> { self.request::(()).await } pub async fn exit(&self) -> Result<()> { self.notify::(()).await } // ------------------------------------------------------------------------------------------- // Text document // ------------------------------------------------------------------------------------------- pub async fn text_document_did_open(&self, doc: &Document) -> Result<()> { self.notify::(lsp::DidOpenTextDocumentParams { text_document: lsp::TextDocumentItem { uri: lsp::Url::from_file_path(doc.path().unwrap()).unwrap(), language_id: "rust".to_string(), // TODO: hardcoded for now version: doc.version, text: String::from(doc.text()), }, }) .await } fn to_changes(changeset: &ChangeSet) -> Vec { let mut iter = changeset.changes().iter().peekable(); let mut old_pos = 0; let mut changes = Vec::new(); use crate::util::pos_to_lsp_pos; use helix_core::Operation::*; // TEMP let rope = helix_core::Rope::from(""); let old_text = rope.slice(..); while let Some(change) = iter.next() { let len = match change { Delete(i) | Retain(i) => *i, Insert(_) => 0, }; let old_end = old_pos + len; match change { Retain(_) => {} Delete(_) => { let start = pos_to_lsp_pos(&old_text, old_pos); let end = pos_to_lsp_pos(&old_text, old_end); // a subsequent ins means a replace, consume it if let Some(Insert(s)) = iter.peek() { iter.next(); // replacement changes.push(lsp::TextDocumentContentChangeEvent { range: Some(lsp::Range::new(start, end)), text: s.into(), range_length: None, }); } else { // deletion changes.push(lsp::TextDocumentContentChangeEvent { range: Some(lsp::Range::new(start, end)), text: "".to_string(), range_length: None, }); }; } Insert(s) => { let start = pos_to_lsp_pos(&old_text, old_pos); // insert changes.push(lsp::TextDocumentContentChangeEvent { range: Some(lsp::Range::new(start, start)), text: s.into(), range_length: None, }); } } old_pos = old_end; } changes } // TODO: trigger any time history.commit_revision happens pub async fn text_document_did_change( &self, doc: &Document, transaction: &Transaction, ) -> Result<()> { // figure out what kind of sync the server supports let capabilities = self.capabilities.as_ref().unwrap(); // TODO: needs post init let sync_capabilities = match capabilities.text_document_sync { Some(lsp::TextDocumentSyncCapability::Kind(kind)) => kind, Some(lsp::TextDocumentSyncCapability::Options(lsp::TextDocumentSyncOptions { change: Some(kind), .. })) => kind, // None | SyncOptions { changes: None } _ => return Ok(()), }; let changes = match sync_capabilities { lsp::TextDocumentSyncKind::Full => { vec![lsp::TextDocumentContentChangeEvent { // range = None -> whole document range: None, //Some(Range) range_length: None, // u64 apparently deprecated text: "".to_string(), }] // TODO: probably need old_state here too? } lsp::TextDocumentSyncKind::Incremental => Self::to_changes(transaction.changes()), lsp::TextDocumentSyncKind::None => return Ok(()), }; self.notify::(lsp::DidChangeTextDocumentParams { text_document: lsp::VersionedTextDocumentIdentifier::new( // TODO: doc.into() Url lsp::Url::from_file_path(doc.path().unwrap()).unwrap(), doc.version, ), content_changes: changes, }) .await } // TODO: impl into() TextDocumentIdentifier / VersionedTextDocumentIdentifier for Document. pub async fn text_document_did_close(&self, doc: &Document) -> Result<()> { self.notify::(lsp::DidCloseTextDocumentParams { text_document: text_document_identifier(doc), }) .await } // will_save / will_save_wait_until pub async fn text_document_did_save(&self) -> anyhow::Result<()> { unimplemented!() } }