forked from Mirrors/helix
Add support for LSP DidChangeWatchedFiles (#7665)
* Add initial support for LSP DidChangeWatchedFiles * Move file event Handler to helix-lsp * Simplify file event handling * Refactor file event handling * Block on future within LSP file event handler * Fully qualify uses of the file_event::Handler type * Rename ops field to options * Revert newline removal from helix-view/Cargo.toml * Ensure file event Handler is cleaned up when lsp client is shutdownmain
Ryan Fowler
1 year ago
committed by
GitHub
parent
8977123f25
commit
5c41f22c2a
@ -0,0 +1,193 @@
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use std::{collections::HashMap, path::PathBuf, sync::Weak};
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use globset::{GlobBuilder, GlobSetBuilder};
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use tokio::sync::mpsc;
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use crate::{lsp, Client};
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enum Event {
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FileChanged {
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path: PathBuf,
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},
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Register {
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client_id: usize,
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client: Weak<Client>,
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registration_id: String,
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options: lsp::DidChangeWatchedFilesRegistrationOptions,
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},
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Unregister {
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client_id: usize,
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registration_id: String,
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},
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RemoveClient {
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client_id: usize,
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},
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}
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#[derive(Default)]
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struct ClientState {
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client: Weak<Client>,
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registered: HashMap<String, globset::GlobSet>,
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}
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/// The Handler uses a dedicated tokio task to respond to file change events by
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/// forwarding changes to LSPs that have registered for notifications with a
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/// matching glob.
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///
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/// When an LSP registers for the DidChangeWatchedFiles notification, the
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/// Handler is notified by sending the registration details in addition to a
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/// weak reference to the LSP client. This is done so that the Handler can have
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/// access to the client without preventing the client from being dropped if it
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/// is closed and the Handler isn't properly notified.
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#[derive(Clone, Debug)]
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pub struct Handler {
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tx: mpsc::UnboundedSender<Event>,
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}
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impl Default for Handler {
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fn default() -> Self {
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Self::new()
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}
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}
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impl Handler {
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pub fn new() -> Self {
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let (tx, rx) = mpsc::unbounded_channel();
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tokio::spawn(Self::run(rx));
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Self { tx }
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}
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pub fn register(
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&self,
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client_id: usize,
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client: Weak<Client>,
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registration_id: String,
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options: lsp::DidChangeWatchedFilesRegistrationOptions,
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) {
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let _ = self.tx.send(Event::Register {
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client_id,
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client,
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registration_id,
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options,
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});
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}
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pub fn unregister(&self, client_id: usize, registration_id: String) {
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let _ = self.tx.send(Event::Unregister {
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client_id,
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registration_id,
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});
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}
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pub fn file_changed(&self, path: PathBuf) {
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let _ = self.tx.send(Event::FileChanged { path });
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}
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pub fn remove_client(&self, client_id: usize) {
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let _ = self.tx.send(Event::RemoveClient { client_id });
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}
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async fn run(mut rx: mpsc::UnboundedReceiver<Event>) {
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let mut state: HashMap<usize, ClientState> = HashMap::new();
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while let Some(event) = rx.recv().await {
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match event {
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Event::FileChanged { path } => {
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log::debug!("Received file event for {:?}", &path);
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state.retain(|id, client_state| {
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if !client_state
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.registered
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.values()
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.any(|glob| glob.is_match(&path))
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{
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return true;
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}
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let Some(client) = client_state.client.upgrade() else {
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log::warn!("LSP client was dropped: {id}");
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return false;
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};
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let Ok(uri) = lsp::Url::from_file_path(&path) else {
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return true;
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};
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log::debug!(
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"Sending didChangeWatchedFiles notification to client '{}'",
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client.name()
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);
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if let Err(err) = crate::block_on(client
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.did_change_watched_files(vec![lsp::FileEvent {
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uri,
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// We currently always send the CHANGED state
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// since we don't actually have more context at
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// the moment.
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typ: lsp::FileChangeType::CHANGED,
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}]))
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{
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log::warn!("Failed to send didChangeWatchedFiles notification to client: {err}");
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}
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true
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});
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}
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Event::Register {
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client_id,
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client,
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registration_id,
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options: ops,
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} => {
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log::debug!(
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"Registering didChangeWatchedFiles for client '{}' with id '{}'",
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client_id,
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registration_id
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);
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let mut entry = state.entry(client_id).or_insert_with(ClientState::default);
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entry.client = client;
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let mut builder = GlobSetBuilder::new();
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for watcher in ops.watchers {
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if let lsp::GlobPattern::String(pattern) = watcher.glob_pattern {
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if let Ok(glob) = GlobBuilder::new(&pattern).build() {
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builder.add(glob);
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}
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}
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}
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match builder.build() {
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Ok(globset) => {
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entry.registered.insert(registration_id, globset);
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}
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Err(err) => {
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// Remove any old state for that registration id and
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// remove the entire client if it's now empty.
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entry.registered.remove(®istration_id);
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if entry.registered.is_empty() {
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state.remove(&client_id);
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}
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log::warn!(
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"Unable to build globset for LSP didChangeWatchedFiles {err}"
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)
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}
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}
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}
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Event::Unregister {
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client_id,
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registration_id,
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} => {
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log::debug!(
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"Unregistering didChangeWatchedFiles with id '{}' for client '{}'",
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registration_id,
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client_id
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);
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if let Some(client_state) = state.get_mut(&client_id) {
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client_state.registered.remove(®istration_id);
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if client_state.registered.is_empty() {
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state.remove(&client_id);
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}
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}
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}
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Event::RemoveClient { client_id } => {
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log::debug!("Removing LSP client: {client_id}");
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state.remove(&client_id);
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}
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}
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}
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}
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}
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