Throw error if no folder is opened

Author: Timmmm

editors/code/src/client.ts

@@ -30,14 +30,14 @@ export function configToServerOptions(config: Config) {
     };
 }
 
-export async function createClient(config: Config, serverPath: string, workspaceFolder: vscode.WorkspaceFolder | null): Promise<lc.LanguageClient> {
+export async function createClient(config: Config, serverPath: string, workspaceFolder: vscode.WorkspaceFolder): Promise<lc.LanguageClient> {
     // '.' Is the fallback if no folder is open
     // TODO?: Workspace folders support Uri's (eg: file://test.txt).
     // It might be a good idea to test if the uri points to a file.
 
     const run: lc.Executable = {
         command: serverPath,
-        options: { cwd: workspaceFolder?.uri.fsPath ?? '.' },
+        options: { cwd: workspaceFolder.uri.fsPath },
     };
     const serverOptions: lc.ServerOptions = {
         run,

editors/code/src/ctx.ts

@@ -19,7 +19,7 @@ export class Ctx {
         config: Config,
         extCtx: vscode.ExtensionContext,
         serverPath: string,
-        workspaceFolder: vscode.WorkspaceFolder | null,
+        workspaceFolder: vscode.WorkspaceFolder,
     ): Promise<Ctx> {
         const client = await createClient(config, serverPath, workspaceFolder);
         const res = new Ctx(config, extCtx, client, serverPath);

editors/code/src/main.ts

@@ -42,7 +42,12 @@ export async function activate(context: vscode.ExtensionContext) {
     const state = new PersistentState(context.globalState);
     const serverPath = await bootstrap(config, state);
 
-    const workspaceFolder = vscode.workspace.workspaceFolders?.[0] ?? null;
+    const workspaceFolder = vscode.workspace.workspaceFolders?.[0];
+    if (workspaceFolder === undefined) {
+        const err = "Cannot activate rust-analyzer when no folder is opened";
+        void vscode.window.showErrorMessage(err);
+        throw new Error(err);
+    }
 
     // Note: we try to start the server before we activate type hints so that it
     // registers its `onDidChangeDocument` handler before us.