Adds "restart server" command

crates/gen_lsp_server/src/stdio.rs

@@ -37,11 +37,9 @@ pub struct Threads {
 }
 
 impl Threads {
-    pub fn join(self) -> Result<()> {
-        match self.reader.join() {
-            Ok(r) => r?,
-            Err(_) => bail!("reader panicked"),
-        }
+    pub fn exit(self) -> Result<()> {
+        // We can't rely on stdin being closed
+        drop(self.reader);
         match self.writer.join() {
             Ok(r) => r,
             Err(_) => bail!("writer panicked"),

crates/ra_lsp_server/src/main.rs

@@ -54,7 +54,7 @@ fn main_inner() -> Result<()> {
         ra_lsp_server::main_loop(workspace_roots, opts, r, s)
     })?;
     log::info!("shutting down IO...");
-    threads.join()?;
+    threads.exit()?;
     log::info!("... IO is down");
     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 +138,12 @@ 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();
+    }
+}