Merge #1153

1153: "Restart server" command r=jrvidal a=jrvidal

The only tricky aspect is that fact that once the `exit` command has been received, we no longer need to join on the reader thread. 

Also, I think `terminateProcesses.sh` was not working properly. In fact, the very same script from the vscode language server implementation is not working either! It's because of that I noticed the reader thread issue 😮 

Co-authored-by: Roberto Vidal <vidal.roberto.j@gmail.com>

crates/gen_lsp_server/src/stdio.rs

@@ -5,6 +5,7 @@ use std::{
 
 use crossbeam_channel::{bounded, Receiver, Sender};
 use failure::bail;
+use lsp_types::notification::Exit;
 
 use crate::{RawMessage, Result};
 
@@ -21,9 +22,18 @@ pub fn stdio_transport() -> (Receiver<RawMessage>, Sender<RawMessage>, Threads)
         let stdin = stdin();
         let mut stdin = stdin.lock();
         while let Some(msg) = RawMessage::read(&mut stdin)? {
+            let is_exit = match &msg {
+                RawMessage::Notification(n) => n.is::<Exit>(),
+                _ => false,
+            };
+
             if let Err(_) = reader_sender.send(msg) {
                 break;
             }
+
+            if is_exit {
+                break;
+            }
         }
         Ok(())
     });

editors/code/package.json

@@ -114,6 +114,11 @@
                 "command": "rust-analyzer.collectGarbage",
                 "title": "Run garbage collection",
                 "category": "Rust Analyzer"
+            },
+            {
+                "command": "rust-analyzer.reload",
+                "title": "Restart server",
+                "category": "Rust Analyzer"
             }
         ],
         "keybindings": [

editors/code/src/extension.ts

@@ -120,11 +120,16 @@ export function activate(context: vscode.ExtensionContext) {
         context.subscriptions
     );
 
+    const startServer = () => Server.start(allNotifications);
+    const reloadCommand = () => reloadServer(startServer);
+
+    vscode.commands.registerCommand('rust-analyzer.reload', reloadCommand);
+
     // Executing `cargo watch` provides us with inline diagnostics on save
     interactivelyStartCargoWatch(context);
 
     // Start the language server, finally!
-    Server.start(allNotifications);
+    startServer();
 }
 
 export function deactivate(): Thenable<void> {
@@ -133,3 +138,11 @@ export function deactivate(): Thenable<void> {
     }
     return Server.client.stop();
 }
+
+async function reloadServer(startServer: () => void) {
+    if (Server.client != null) {
+        vscode.window.showInformationMessage('Reloading rust-analyzer...');
+        await Server.client.stop();
+        startServer();
+    }
+}