Added stop/restart LS commands.

No `when` context for now but executing the new commands are a NOOP if
stop/restart is not legit.

Signed-off-by: Akos Kitta <kittaakos@typefox.io>

Author: Akos Kitta

package.json

@@ -70,7 +70,9 @@
   "activationEvents": [
     "onLanguage:ino",
     "onCommand:arduino.debug.start",
-    "onCommand:arduino.languageserver.start"
+    "onCommand:arduino.languageserver.start",
+    "onCommand:arduino.languageserver.stop",
+    "onCommand:arduino.languageserver.restart"
   ],
   "contributes": {
     "languages": [
@@ -105,6 +107,16 @@
         "title": "Start Language Server",
         "category": "Arduino"
       },
+      {
+        "command": "arduino.languageserver.stop",
+        "title": "Stop Language Server",
+        "category": "Arduino"
+      },
+      {
+        "command": "arduino.languageserver.restart",
+        "title": "Restart Language Server",
+        "category": "Arduino"
+      },
       {
         "command": "arduino.debug.start",
         "title": "Start Debug",

src/extension.ts

@@ -66,10 +66,28 @@ export function activate(context: ExtensionContext) {
                 const started = await startLanguageServer(context, config);
                 languageServerIsRunning = started;
                 return languageServerIsRunning ? config.board.fqbn : undefined;
+            } catch (e) {
+                console.log(e);
+                languageServerIsRunning = false;
+                throw e;
             } finally {
                 unlock();
             }
         }),
+        vscode.commands.registerCommand('arduino.languageserver.stop', async () => {
+            const unlock = await languageServerStartMutex.acquire();
+            try {
+                await stopLanguageServer(context);
+                languageServerIsRunning = false;
+            } finally {
+                unlock();
+            }
+        }),
+        vscode.commands.registerCommand('arduino.languageserver.restart', async () => {
+            if (latestConfig) {
+                return vscode.commands.executeCommand('arduino.languageserver.start', latestConfig);
+            }
+        }),
         vscode.commands.registerCommand('arduino.debug.start', (config: DebugConfig) => startDebug(context, config))
     );
 }
@@ -141,7 +159,7 @@ async function startDebug(_: ExtensionContext, config: DebugConfig): Promise<boo
     return vscode.debug.startDebugging(undefined, mergedDebugConfig);
 }
 
-async function startLanguageServer(context: ExtensionContext, config: LanguageServerConfig): Promise<boolean> {
+async function stopLanguageServer(context: ExtensionContext): Promise<void> {
     if (languageClient) {
         if (languageClient.diagnostics) {
             languageClient.diagnostics.clear();
@@ -151,6 +169,10 @@ async function startLanguageServer(context: ExtensionContext, config: LanguageSe
             languageServerDisposable.dispose();
         }
     }
+}
+
+async function startLanguageServer(context: ExtensionContext, config: LanguageServerConfig): Promise<boolean> {
+    await stopLanguageServer(context);
     if (!languageClient || !deepEqual(latestConfig, config)) {
         latestConfig = config;
         languageClient = await buildLanguageClient(config);