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helix-plus/helix-lsp/src/client.rs

356 lines
12 KiB
Rust

use crate::{
transport::{Payload, Transport},
Call, Error,
};
type Result<T> = core::result::Result<T, Error>;
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,
};
pub struct Client {
_process: Child,
stderr: BufReader<ChildStderr>,
outgoing: Sender<Payload>,
pub incoming: Receiver<Call>,
pub request_counter: AtomicU64,
capabilities: Option<lsp::ServerCapabilities>,
// TODO: handle PublishDiagnostics Version
// diagnostics: HashMap<lsp::Url, Vec<lsp::Diagnostic>>,
}
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: process,
stderr,
outgoing,
incoming,
request_counter: AtomicU64::new(0),
capabilities: None,
// diagnostics: HashMap::new(),
}
}
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<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)
}
/// Execute a RPC request on the language server.
pub async fn request<R: lsp::request::Request>(&self, params: R::Params) -> 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::<Result<Value>>(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<R: lsp::notification::Notification>(&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<Value, jsonrpc::Error>,
) -> 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 {
4 years ago
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,
4 years ago
locale: None, // TODO
};
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(&self) -> Result<()> {
self.request::<lsp::request::Shutdown>(()).await
}
pub async fn exit(&self) -> Result<()> {
self.notify::<lsp::notification::Exit>(()).await
}
// -------------------------------------------------------------------------------------------
// Text document
// -------------------------------------------------------------------------------------------
pub async fn text_document_did_open(&mut self, doc: &Document) -> Result<()> {
self.notify::<lsp::notification::DidOpenTextDocument>(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<lsp::TextDocumentContentChangeEvent> {
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(
&mut 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::notification::DidChangeTextDocument>(lsp::DidChangeTextDocumentParams {
text_document: lsp::VersionedTextDocumentIdentifier::new(
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(&mut self, doc: &Document) -> Result<()> {
self.notify::<lsp::notification::DidCloseTextDocument>(lsp::DidCloseTextDocumentParams {
text_document: lsp::TextDocumentIdentifier::new(
lsp::Url::from_file_path(doc.path().unwrap()).unwrap(),
),
})
.await
}
// will_save / will_save_wait_until
pub async fn text_document_did_save(&mut self) -> anyhow::Result<()> {
unimplemented!()
}
}