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use async_tungstenite::tokio::accept_async;
use serde_json::Value;
use tokio::net::TcpListener;
use tower_lsp::jsonrpc::Result;
use tower_lsp::lsp_types::*;
use tower_lsp::{Client, LanguageServer, LspService, Server};
use tracing::info;
use ws_stream_tungstenite::*;
#[derive(Debug)]
struct Backend {
client: Client,
}
#[tower_lsp::async_trait]
impl LanguageServer for Backend {
async fn initialize(&self, _: InitializeParams) -> Result<InitializeResult> {
Ok(InitializeResult {
server_info: None,
capabilities: ServerCapabilities {
text_document_sync: Some(TextDocumentSyncCapability::Kind(
TextDocumentSyncKind::INCREMENTAL,
)),
completion_provider: Some(CompletionOptions {
resolve_provider: Some(false),
trigger_characters: Some(vec![".".to_string()]),
..Default::default()
}),
execute_command_provider: Some(ExecuteCommandOptions {
commands: vec!["dummy.do_something".to_string()],
..Default::default()
}),
workspace: Some(WorkspaceServerCapabilities {
workspace_folders: Some(WorkspaceFoldersServerCapabilities {
supported: Some(true),
change_notifications: Some(OneOf::Left(true)),
}),
..Default::default()
}),
..ServerCapabilities::default()
},
..Default::default()
})
}
async fn initialized(&self, _: InitializedParams) {
self.client
.log_message(MessageType::INFO, "initialized!")
.await;
}
async fn shutdown(&self) -> Result<()> {
Ok(())
}
async fn did_change_workspace_folders(&self, _: DidChangeWorkspaceFoldersParams) {
self.client
.log_message(MessageType::INFO, "workspace folders changed!")
.await;
}
async fn did_change_configuration(&self, _: DidChangeConfigurationParams) {
self.client
.log_message(MessageType::INFO, "configuration changed!")
.await;
}
async fn did_change_watched_files(&self, _: DidChangeWatchedFilesParams) {
self.client
.log_message(MessageType::INFO, "watched files have changed!")
.await;
}
async fn execute_command(&self, _: ExecuteCommandParams) -> Result<Option<Value>> {
self.client
.log_message(MessageType::INFO, "command executed!")
.await;
match self.client.apply_edit(WorkspaceEdit::default()).await {
Ok(res) if res.applied => self.client.log_message(MessageType::INFO, "applied").await,
Ok(_) => self.client.log_message(MessageType::INFO, "rejected").await,
Err(err) => self.client.log_message(MessageType::ERROR, err).await,
}
Ok(None)
}
async fn did_open(&self, _: DidOpenTextDocumentParams) {
self.client
.log_message(MessageType::INFO, "file opened!")
.await;
}
async fn did_change(&self, _: DidChangeTextDocumentParams) {
self.client
.log_message(MessageType::INFO, "file changed!")
.await;
}
async fn did_save(&self, _: DidSaveTextDocumentParams) {
self.client
.log_message(MessageType::INFO, "file saved!")
.await;
}
async fn did_close(&self, _: DidCloseTextDocumentParams) {
self.client
.log_message(MessageType::INFO, "file closed!")
.await;
}
async fn completion(&self, _: CompletionParams) -> Result<Option<CompletionResponse>> {
Ok(Some(CompletionResponse::Array(vec![
CompletionItem::new_simple("Hello".to_string(), "Some detail".to_string()),
CompletionItem::new_simple("Bye".to_string(), "More detail".to_string()),
])))
}
}
#[tokio::main]
async fn main() {
#[cfg(feature = "runtime-agnostic")]
use tokio_util::compat::{TokioAsyncReadCompatExt, TokioAsyncWriteCompatExt};
tracing_subscriber::fmt().init();
let listener = TcpListener::bind("127.0.0.1:9257").await.unwrap();
info!("Listening on {}", listener.local_addr().unwrap());
let (stream, _) = listener.accept().await.unwrap();
let (read, write) = tokio::io::split(WsStream::new(accept_async(stream).await.unwrap()));
#[cfg(feature = "runtime-agnostic")]
let (read, write) = (read.compat(), write.compat_write());
let (service, socket) = LspService::new(|client| Backend { client });
Server::new(read, write, socket).serve(service).await;
}
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