use crate::{ transport::{Payload, Transport}, Call, Error, }; type Result = core::result::Result; use helix_core::{ChangeSet, Rope}; // 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, Command, Stdio}, Executor, }; pub struct Client { _process: Child, 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, stderr); let client = Client { _process: process, 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 value_into_params(value: Value) -> jsonrpc::Params { use jsonrpc::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), } } /// 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::value_into_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()))?; use smol_timeout::TimeoutExt; use std::time::Duration; let response = match rx.recv().timeout(Duration::from_secs(2)).await { Some(response) => response, None => return Err(Error::Timeout), } .map_err(|e| Error::Other(e.into()))??; let response = serde_json::from_value(response)?; 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::value_into_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 { text_document: Some(lsp::TextDocumentClientCapabilities { completion: Some(lsp::CompletionClientCapabilities { completion_item: Some(lsp::CompletionItemCapability { snippet_support: Some(false), // TODO ..Default::default() }), completion_item_kind: Some(lsp::CompletionItemKindCapability { ..Default::default() }), context_support: None, // additional context information Some(true) ..Default::default() }), // { completion: { // dynamic_registration: bool // completion_item: { snippet, documentation_format, ... } // completion_item_kind: { } // } } ..Default::default() }), ..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, uri: lsp::Url, version: i32, doc: &Rope, ) -> Result<()> { self.notify::(lsp::DidOpenTextDocumentParams { text_document: lsp::TextDocumentItem { uri, language_id: "rust".to_string(), // TODO: hardcoded for now version, text: String::from(doc), }, }) .await } // TODO: this is dumb. TextEdit describes changes to the initial doc (concurrent), but // TextDocumentContentChangeEvent describes a series of changes (sequential). // So S -> S1 -> S2, meaning positioning depends on the previous edits. // // Calculation is therefore a bunch trickier. pub fn changeset_to_changes( old_text: &Rope, new_text: &Rope, changeset: &ChangeSet, ) -> Vec { let mut iter = changeset.changes().iter().peekable(); let mut old_pos = 0; let mut new_pos = 0; let mut changes = Vec::new(); use crate::util::pos_to_lsp_pos; use helix_core::Operation::*; // TODO: stolen from syntax.rs, share use helix_core::RopeSlice; fn traverse(pos: lsp::Position, text: RopeSlice) -> lsp::Position { let lsp::Position { mut line, mut character, } = pos; // TODO: there should be a better way here for ch in text.chars() { if ch == '\n' { line += 1; character = 0; } else { character += ch.len_utf16() as u32; } } lsp::Position { line, character } } let old_text = old_text.slice(..); let new_text = new_text.slice(..); // TODO: verify this function, specifically line num counting while let Some(change) = iter.next() { let len = match change { Delete(i) | Retain(i) => *i, Insert(_) => 0, }; let mut old_end = old_pos + len; match change { Retain(i) => { new_pos += i; } Delete(_) => { let start = pos_to_lsp_pos(new_text, new_pos); let end = traverse(start, old_text.slice(old_pos..old_end)); // 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(new_text, new_pos); new_pos += s.chars().count(); // a subsequent delete means a replace, consume it let end = if let Some(Delete(len)) = iter.peek() { old_end = old_pos + len; let end = traverse(start, old_text.slice(old_pos..old_end)); iter.next(); // replacement end } else { // insert start }; changes.push(lsp::TextDocumentContentChangeEvent { range: Some(lsp::Range::new(start, end)), 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, text_document: lsp::VersionedTextDocumentIdentifier, old_text: &Rope, new_text: &Rope, changes: &ChangeSet, ) -> 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::changeset_to_changes(old_text, new_text, changes) } lsp::TextDocumentSyncKind::None => return Ok(()), }; self.notify::(lsp::DidChangeTextDocumentParams { text_document, content_changes: changes, }) .await } // TODO: impl into() TextDocumentIdentifier / VersionedTextDocumentIdentifier for Document. pub async fn text_document_did_close( &self, text_document: lsp::TextDocumentIdentifier, ) -> Result<()> { self.notify::(lsp::DidCloseTextDocumentParams { text_document, }) .await } // will_save / will_save_wait_until pub async fn text_document_did_save(&self) -> anyhow::Result<()> { unimplemented!() } pub async fn completion( &self, text_document: lsp::TextDocumentIdentifier, position: lsp::Position, ) -> anyhow::Result> { // TODO: figure out what should happen when you complete with multiple cursors let params = lsp::CompletionParams { text_document_position: lsp::TextDocumentPositionParams { text_document, position, }, // TODO: support these tokens by async receiving and updating the choice list work_done_progress_params: lsp::WorkDoneProgressParams { work_done_token: None, }, partial_result_params: lsp::PartialResultParams { partial_result_token: None, }, context: None, // lsp::CompletionContext { trigger_kind: , trigger_character: Some(), } }; let response = self.request::(params).await?; let items = match response { Some(lsp::CompletionResponse::Array(items)) => items, // TODO: do something with is_incomplete Some(lsp::CompletionResponse::List(lsp::CompletionList { is_incomplete: _is_incomplete, items, })) => items, None => Vec::new(), }; Ok(items) } }