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helix/helix-lsp/src/lib.rs

277 lines
8.5 KiB
Rust

mod transport;
use transport::{Payload, Transport};
use helix_core::{State, Transaction};
// use std::collections::HashMap;
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use jsonrpc_core as jsonrpc;
use lsp_types as lsp;
use serde_json::Value;
use serde::{Deserialize, Serialize};
pub use lsp::Position;
pub use lsp::Url;
use smol::{
channel::{Receiver, Sender},
io::{BufReader, BufWriter},
// prelude::*,
process::{Child, ChildStderr, Command, Stdio},
Executor,
};
pub mod util {
use super::*;
pub fn lsp_pos_to_pos(doc: &helix_core::RopeSlice, pos: lsp::Position) -> usize {
let line = doc.line_to_char(pos.line as usize);
let line_start = doc.char_to_utf16_cu(line);
doc.utf16_cu_to_char(pos.character as usize + line_start)
}
}
/// 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<ChildStderr>,
outgoing: Sender<Payload>,
pub incoming: Receiver<Notification>,
pub request_counter: u64,
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capabilities: Option<lsp::ServerCapabilities>,
// TODO: handle PublishDiagnostics Version
// diagnostics: HashMap<lsp::Url, Vec<lsp::Diagnostic>>,
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}
impl Client {
pub fn start(ex: &Executor, cmd: &str, args: &[String]) -> Self {
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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?
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// 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: 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<jsonrpc::Params> {
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<R: lsp::request::Request>(
&mut self,
params: R::Params,
) -> anyhow::Result<R::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::<anyhow::Result<Value>>(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<R: lsp::notification::Notification>(
&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::<lsp::request::Initialize>(params).await?;
self.capabilities = Some(response.capabilities);
// next up, notify<initialized>
self.notify::<lsp::notification::Initialized>(lsp::InitializedParams {})
.await?;
Ok(())
}
pub async fn shutdown(&mut self) -> anyhow::Result<()> {
self.request::<lsp::request::Shutdown>(()).await
}
pub async fn exit(&mut self) -> anyhow::Result<()> {
self.notify::<lsp::notification::Exit>(()).await
}
// -------------------------------------------------------------------------------------------
// Text document
// -------------------------------------------------------------------------------------------
pub async fn text_document_did_open(&mut self, state: &State) -> anyhow::Result<()> {
self.notify::<lsp::notification::DidOpenTextDocument>(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: state.version,
text: String::from(&state.doc),
},
})
.await
}
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// TODO: trigger any time history.commit_revision happens
pub async fn text_document_did_change(
&mut self,
state: &State,
transaction: &Transaction,
) -> anyhow::Result<()> {
self.notify::<lsp::notification::DidChangeTextDocument>(lsp::DidChangeTextDocumentParams {
text_document: lsp::VersionedTextDocumentIdentifier::new(
lsp::Url::from_file_path(state.path().unwrap()).unwrap(),
state.version,
),
content_changes: vec![], // TODO: probably need old_state here too?
})
.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!()
}
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}