Start moving more LSP calls into callbacks/futures without capturing self

helix-lsp/src/client.rs

@@ -112,32 +112,35 @@ impl Client {
         R::Result: core::fmt::Debug, // TODO: temporary
     {
         // a future that resolves into the response
-        let future = self.call::<R>(params).await?;
-        let json = future.await?;
+        let json = self.call::<R>(params).await?;
         let response = serde_json::from_value(json)?;
         Ok(response)
     }
 
     /// Execute a RPC request on the language server.
-    pub async fn call<R: lsp::request::Request>(
+    pub fn call<R: lsp::request::Request>(
         &self,
         params: R::Params,
-    ) -> Result<impl Future<Output = Result<Value>>>
+    ) -> impl Future<Output = Result<Value>>
     where
         R::Params: serde::Serialize,
     {
+        let outgoing = self.outgoing.clone();
+        let id = self.next_request_id();
+
+        async move {
             let params = serde_json::to_value(params)?;
 
             let request = jsonrpc::MethodCall {
                 jsonrpc: Some(jsonrpc::Version::V2),
-            id: self.next_request_id(),
+                id,
                 method: R::METHOD.to_string(),
                 params: Self::value_into_params(params),
             };
 
             let (tx, mut rx) = channel::<Result<Value>>(1);
 
-        self.outgoing
+            outgoing
                 .send(Payload::Request {
                     chan: tx,
                     value: request,
@@ -147,14 +150,11 @@ impl Client {
             use std::time::Duration;
             use tokio::time::timeout;
 
-        let future = async move {
             timeout(Duration::from_secs(2), rx.recv())
                 .await
                 .map_err(|e| Error::Timeout)? // return Timeout
                 .unwrap() // TODO: None if channel closed
-        };
-
-        Ok(future)
+        }
     }
 
     /// Send a RPC notification to the language server.
@@ -269,21 +269,21 @@ impl Client {
         self.request::<lsp::request::Shutdown>(()).await
     }
 
-    pub async fn exit(&self) -> Result<()> {
-        self.notify::<lsp::notification::Exit>(()).await
+    pub fn exit(&self) -> impl Future<Output = Result<()>> {
+        self.notify::<lsp::notification::Exit>(())
     }
 
     // -------------------------------------------------------------------------------------------
     // Text document
     // -------------------------------------------------------------------------------------------
 
-    pub async fn text_document_did_open(
+    pub fn text_document_did_open(
         &self,
         uri: lsp::Url,
         version: i32,
         doc: &Rope,
         language_id: String,
-    ) -> Result<()> {
+    ) -> impl Future<Output = Result<()>> {
         self.notify::<lsp::notification::DidOpenTextDocument>(lsp::DidOpenTextDocumentParams {
             text_document: lsp::TextDocumentItem {
                 uri,
@@ -292,7 +292,6 @@ impl Client {
                 text: String::from(doc),
             },
         })
-        .await
     }
 
     pub fn changeset_to_changes(
@@ -435,14 +434,13 @@ impl Client {
         ))
     }
 
-    pub async fn text_document_did_close(
+    pub fn text_document_did_close(
         &self,
         text_document: lsp::TextDocumentIdentifier,
-    ) -> Result<()> {
+    ) -> impl Future<Output = Result<()>> {
         self.notify::<lsp::notification::DidCloseTextDocument>(lsp::DidCloseTextDocumentParams {
             text_document,
         })
-        .await
     }
 
     // will_save / will_save_wait_until
@@ -477,11 +475,11 @@ impl Client {
         .await
     }
 
-    pub async fn completion(
+    pub fn completion(
         &self,
         text_document: lsp::TextDocumentIdentifier,
         position: lsp::Position,
-    ) -> Result<impl Future<Output = Result<Value>>> {
+    ) -> impl Future<Output = Result<Value>> {
         // ) -> Result<Vec<lsp::CompletionItem>> {
         let params = lsp::CompletionParams {
             text_document_position: lsp::TextDocumentPositionParams {
@@ -499,7 +497,7 @@ impl Client {
             // lsp::CompletionContext { trigger_kind: , trigger_character: Some(), }
         };
 
-        self.call::<lsp::request::Completion>(params).await
+        self.call::<lsp::request::Completion>(params)
     }
 
     pub async fn text_document_signature_help(

helix-term/src/commands.rs

@@ -1790,12 +1790,12 @@ pub fn completion(cx: &mut Context) {
     );
 
     // TODO: handle fails
-    let res = block_on(language_server.completion(doc.identifier(), pos)).unwrap();
+    let future = language_server.completion(doc.identifier(), pos);
 
     let trigger_offset = doc.selection(view.id).cursor();
 
     cx.callback(
-        res,
+        future,
         move |editor: &mut Editor,
               compositor: &mut Compositor,
               response: Option<lsp::CompletionResponse>| {

helix-view/src/editor.rs

@@ -131,14 +131,12 @@ impl Editor {
                     .map(ToOwned::to_owned)
                     .unwrap_or_default();
 
-                let rt = tokio::runtime::Handle::current();
-                rt.block_on(language_server.text_document_did_open(
+                tokio::spawn(language_server.text_document_did_open(
                     doc.url().unwrap(),
                     doc.version(),
                     doc.text(),
                     language_id,
-                ))
-                .unwrap();
+                ));
             }
 
             let id = self.documents.insert(doc);
@@ -162,9 +160,7 @@ impl Editor {
             .and_then(|language| language_servers.get(language));
 
         if let Some(language_server) = language_server {
-            let rt = tokio::runtime::Handle::current();
-            rt.block_on(language_server.text_document_did_close(doc.identifier()))
-                .unwrap();
+            tokio::spawn(language_server.text_document_did_close(doc.identifier()));
         }
 
         // remove selection