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wip: Async async. Delay response handling with a callback.

Browse Source
pull/11/head
Blaž Hrastnik 4 years ago
parent ad3325db8e
commit 2a3910c1d9
8 changed files with 220 additions and 104 deletions
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2
Cargo.lock generated
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@ -549,6 +549,8 @@ dependencies = [
"num_cpus",
"once_cell",
"pulldown-cmark",
"serde",
"serde_json",
"smol",
"smol-timeout",
"toml",

53
helix-lsp/src/client.rs
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@ -1,13 +1,12 @@
use crate::{
transport::{Payload, Transport},
Call, Error,
Call, Error, Result,
};
type Result<T> = core::result::Result<T, Error>;
use helix_core::{ChangeSet, Rope};
// use std::collections::HashMap;
use std::future::Future;
use std::sync::atomic::{AtomicU64, Ordering};
use jsonrpc_core as jsonrpc;
@ -96,6 +95,21 @@ impl Client {
where
R::Params: serde::Serialize,
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 response = serde_json::from_value(json)?;
Ok(response)
}
/// Execute a RPC request on the language server.
pub async fn call<R: lsp::request::Request>(
&self,
params: R::Params,
) -> Result<impl Future<Output = Result<Value>>>
where
R::Params: serde::Serialize,
{
let params = serde_json::to_value(params)?;
@ -119,15 +133,15 @@ impl Client {
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)?;
let future = async move {
rx.recv()
.timeout(Duration::from_secs(2))
.await
.ok_or(Error::Timeout)? // return Timeout
.map_err(|e| Error::Other(e.into()))?
};
Ok(response)
Ok(future)
}
/// Send a RPC notification to the language server.
@ -447,7 +461,8 @@ impl Client {
&self,
text_document: lsp::TextDocumentIdentifier,
position: lsp::Position,
) -> Result<Vec<lsp::CompletionItem>> {
) -> Result<impl Future<Output = Result<Value>>> {
// ) -> Result<Vec<lsp::CompletionItem>> {
let params = lsp::CompletionParams {
text_document_position: lsp::TextDocumentPositionParams {
text_document,
@ -464,19 +479,7 @@ impl Client {
// lsp::CompletionContext { trigger_kind: , trigger_character: Some(), }
};
let response = self.request::<lsp::request::Completion>(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)
self.call::<lsp::request::Completion>(params).await
}
pub async fn text_document_signature_help(

2
helix-lsp/src/lib.rs
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@ -8,6 +8,8 @@ pub use lsp_types as lsp;
pub use client::Client;
pub use lsp::{Position, Url};
pub type Result<T> = core::result::Result<T, Error>;
use helix_core::syntax::LanguageConfiguration;
use thiserror::Error;

3
helix-term/Cargo.toml
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@ -44,3 +44,6 @@ pulldown-cmark = { version = "0.8", default-features = false }
# config
toml = "0.5"
serde_json = "1.0"
serde = { version = "1.0", features = ["derive"] }

29
helix-term/src/application.rs
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@ -24,11 +24,23 @@ use crossterm::{
use tui::layout::Rect;
// use futures_util::future::BoxFuture;
use futures_util::stream::FuturesUnordered;
use std::pin::Pin;
type BoxFuture<T> = Pin<Box<dyn Future<Output = T> + Send>>;
pub type LspCallback =
BoxFuture<Result<Box<dyn FnOnce(&mut Editor, &mut Compositor) + Send>, anyhow::Error>>;
pub type LspCallbacks = FuturesUnordered<LspCallback>;
pub type LspCallbackWrapper = Box<dyn FnOnce(&mut Editor, &mut Compositor) + Send>;
pub struct Application {
compositor: Compositor,
editor: Editor,
executor: &'static smol::Executor<'static>,
callbacks: LspCallbacks,
}
impl Application {
@ -50,6 +62,7 @@ impl Application {
editor,
executor,
callbacks: FuturesUnordered::new(),
};
Ok(app)
@ -59,10 +72,12 @@ impl Application {
let executor = &self.executor;
let editor = &mut self.editor;
let compositor = &mut self.compositor;
let callbacks = &mut self.callbacks;
let mut cx = crate::compositor::Context {
editor,
executor,
callbacks,
scroll: None,
};
@ -87,14 +102,28 @@ impl Application {
call = self.editor.language_servers.incoming.next().fuse() => {
self.handle_language_server_message(call).await
}
callback = self.callbacks.next().fuse() => {
self.handle_language_server_callback(callback)
}
}
}
}
pub fn handle_language_server_callback(
&mut self,
callback: Option<Result<LspCallbackWrapper, anyhow::Error>>,
) {
if let Some(Ok(callback)) = callback {
// TODO: handle Err()
callback(&mut self.editor, &mut self.compositor);
self.render();
}
}
pub fn handle_terminal_events(&mut self, event: Option<Result<Event, crossterm::ErrorKind>>) {
let mut cx = crate::compositor::Context {
editor: &mut self.editor,
executor: &self.executor,
callbacks: &mut self.callbacks,
scroll: None,
};
// Handle key events

231
helix-term/src/commands.rs
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@ -10,7 +10,7 @@ use helix_core::{
use once_cell::sync::Lazy;
use crate::{
compositor::{Callback, Compositor},
compositor::{Callback, Component, Compositor},
ui::{self, Picker, Popup, Prompt, PromptEvent},
};
@ -26,14 +26,20 @@ use crossterm::event::{KeyCode, KeyEvent};
use helix_lsp::lsp;
use crate::application::{LspCallbackWrapper, LspCallbacks};
pub struct Context<'a> {
pub count: usize,
pub editor: &'a mut Editor,
pub callback: Option<crate::compositor::Callback>,
pub on_next_key_callback: Option<Box<dyn FnOnce(&mut Context, KeyEvent)>>,
pub callbacks: &'a mut LspCallbacks,
}
use futures_util::FutureExt;
use std::future::Future;
impl<'a> Context<'a> {
#[inline]
pub fn view(&mut self) -> &mut View {
@ -47,7 +53,7 @@ impl<'a> Context<'a> {
}
/// Push a new component onto the compositor.
pub fn push_layer(&mut self, mut component: Box<dyn crate::compositor::Component>) {
pub fn push_layer(&mut self, mut component: Box<dyn Component>) {
self.callback = Some(Box::new(
|compositor: &mut Compositor, editor: &mut Editor| {
let size = compositor.size();
@ -65,6 +71,27 @@ impl<'a> Context<'a> {
) {
self.on_next_key_callback = Some(Box::new(on_next_key_callback));
}
#[inline]
pub fn callback<T, F>(
&mut self,
call: impl Future<Output = helix_lsp::Result<serde_json::Value>> + 'static + Send,
callback: F,
) where
T: for<'de> serde::Deserialize<'de> + Send + 'static,
F: FnOnce(&mut Editor, &mut Compositor, T) + Send + 'static,
{
let callback = Box::pin(async move {
let json = call.await?;
let response = serde_json::from_value(json)?;
let call: LspCallbackWrapper =
Box::new(move |editor: &mut Editor, compositor: &mut Compositor| {
callback(editor, compositor, response)
});
Ok(call)
});
self.callbacks.push(callback);
}
}
/// A command is a function that takes the current state and a count, and does a side-effect on the
@ -1564,6 +1591,24 @@ pub fn save(cx: &mut Context) {
}
pub fn completion(cx: &mut Context) {
// trigger on trigger char, or if user calls it
// (or on word char typing??)
// after it's triggered, if response marked is_incomplete, update on every subsequent keypress
//
// lsp calls are done via a callback: it sends a request and doesn't block.
// when we get the response similarly to notification, trigger a call to the completion popup
//
// language_server.completion(params, |cx: &mut Context, _meta, response| {
// // called at response time
// // compositor, lookup completion layer
// // downcast dyn Component to Completion component
// // emit response to completion (completion.complete/handle(response))
// })
// async {
// let (response, callback) = response.await?;
// callback(response)
// }
let doc = cx.doc();
let language_server = match doc.language_server() {
@ -1576,91 +1621,119 @@ pub fn completion(cx: &mut Context) {
// TODO: handle fails
let res = smol::block_on(language_server.completion(doc.identifier(), pos)).unwrap_or_default();
// TODO: if no completion, show some message or something
if !res.is_empty() {
// let snapshot = doc.state.clone();
let mut menu = ui::Menu::new(
res,
|item| {
// format_fn
item.label.as_str().into()
// TODO: use item.filter_text for filtering
},
move |editor: &mut Editor, item, event| {
match event {
PromptEvent::Abort => {
// revert state
// let id = editor.view().doc;
// let doc = &mut editor.documents[id];
// doc.state = snapshot.clone();
}
PromptEvent::Validate => {
let id = editor.view().doc;
let doc = &mut editor.documents[id];
// revert state to what it was before the last update
// doc.state = snapshot.clone();
// extract as fn(doc, item):
// TODO: need to apply without composing state...
// TODO: need to update lsp on accept/cancel by diffing the snapshot with
// the final state?
// -> on update simply update the snapshot, then on accept redo the call,
// finally updating doc.changes + notifying lsp.
//
// or we could simply use doc.undo + apply when changing between options
// always present here
let item = item.unwrap();
use helix_lsp::{lsp, util};
// determine what to insert: text_edit | insert_text | label
let edit = if let Some(edit) = &item.text_edit {
match edit {
lsp::CompletionTextEdit::Edit(edit) => edit.clone(),
lsp::CompletionTextEdit::InsertAndReplace(item) => {
unimplemented!("completion: insert_and_replace {:?}", item)
let res = smol::block_on(language_server.completion(doc.identifier(), pos)).unwrap();
cx.callback(
res,
|editor: &mut Editor,
compositor: &mut Compositor,
response: Option<lsp::CompletionResponse>| {
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(),
};
// TODO: if no completion, show some message or something
if !items.is_empty() {
// let snapshot = doc.state.clone();
let mut menu = ui::Menu::new(
items,
|item| {
// format_fn
item.label.as_str().into()
// TODO: use item.filter_text for filtering
},
move |editor: &mut Editor, item, event| {
match event {
PromptEvent::Abort => {
// revert state
// let id = editor.view().doc;
// let doc = &mut editor.documents[id];
// doc.state = snapshot.clone();
}
PromptEvent::Validate => {
let id = editor.view().doc;
let doc = &mut editor.documents[id];
// revert state to what it was before the last update
// doc.state = snapshot.clone();
// extract as fn(doc, item):
// TODO: need to apply without composing state...
// TODO: need to update lsp on accept/cancel by diffing the snapshot with
// the final state?
// -> on update simply update the snapshot, then on accept redo the call,
// finally updating doc.changes + notifying lsp.
//
// or we could simply use doc.undo + apply when changing between options
// always present here
let item = item.unwrap();
use helix_lsp::{lsp, util};
// determine what to insert: text_edit | insert_text | label
let edit = if let Some(edit) = &item.text_edit {
match edit {
lsp::CompletionTextEdit::Edit(edit) => edit.clone(),
lsp::CompletionTextEdit::InsertAndReplace(item) => {
unimplemented!(
"completion: insert_and_replace {:?}",
item
)
}
}
} else {
item.insert_text.as_ref().unwrap_or(&item.label);
unimplemented!();
// lsp::TextEdit::new(); TODO: calculate a TextEdit from insert_text
// and we insert at position.
};
// TODO: merge edit with additional_text_edits
if let Some(additional_edits) = &item.additional_text_edits {
if !additional_edits.is_empty() {
unimplemented!(
"completion: additional_text_edits: {:?}",
additional_edits
);
}
}
let transaction =
util::generate_transaction_from_edits(doc.text(), vec![edit]);
doc.apply(&transaction);
// TODO: doc.append_changes_to_history(); if not in insert mode?
}
} else {
item.insert_text.as_ref().unwrap_or(&item.label);
unimplemented!();
// lsp::TextEdit::new(); TODO: calculate a TextEdit from insert_text
// and we insert at position.
_ => (),
};
},
);
// TODO: merge edit with additional_text_edits
if let Some(additional_edits) = &item.additional_text_edits {
if !additional_edits.is_empty() {
unimplemented!(
"completion: additional_text_edits: {:?}",
additional_edits
);
}
}
let popup = Popup::new(Box::new(menu));
let mut component: Box<dyn Component> = Box::new(popup);
// TODO: <-- if state has changed by further input, transaction will panic on len
let transaction =
util::generate_transaction_from_edits(doc.text(), vec![edit]);
doc.apply(&transaction);
// TODO: doc.append_changes_to_history(); if not in insert mode?
}
_ => (),
};
},
);
// Server error: content modified
let popup = Popup::new(Box::new(menu));
cx.push_layer(Box::new(popup));
// TODO: this is shared with cx.push_layer
let size = compositor.size();
// trigger required_size on init
component.required_size((size.width, size.height));
compositor.push(component);
}
},
);
// TODO!: when iterating over items, show the docs in popup
// // TODO!: when iterating over items, show the docs in popup
// language server client needs to be accessible via a registry of some sort
}
// // language server client needs to be accessible via a registry of some sort
//}
}
pub fn hover(cx: &mut Context) {

3
helix-term/src/compositor.rs
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@ -25,10 +25,13 @@ pub enum EventResult {
use helix_view::{Editor, View};
use crate::application::LspCallbacks;
pub struct Context<'a> {
pub editor: &'a mut Editor,
pub executor: &'static smol::Executor<'static>,
pub scroll: Option<usize>,
pub callbacks: &'a mut LspCallbacks,
}
pub trait Component {

1
helix-term/src/ui/editor.rs
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@ -439,6 +439,7 @@ impl Component for EditorView {
editor: &mut cx.editor,
count: 1,
callback: None,
callbacks: cx.callbacks,
on_next_key_callback: None,
};

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