Show notification if no active Manim session when trying to quit

src/extension.ts

@@ -171,11 +171,11 @@ async function clearScene() {
 		await ManimShell.instance.executeCommandErrorOnNoActiveSession("clear()");
 	} catch (error) {
 		if (error instanceof NoActiveShellError) {
-			Window.showErrorMessage('No active Manim session found to remove objects from.');
-		} else {
-			Logger.error(`💥 Error while trying to remove objects from scene: ${error}`);
-			throw error;
+			Window.showWarningMessage('No active Manim session found to remove objects from.');
+			return;
 		}
+		Logger.error(`💥 Error while trying to remove objects from scene: ${error}`);
+		throw error;
 	}
 }
 

src/manimShell.ts

@@ -259,8 +259,8 @@ export class ManimShell {
             return;
         }
 
-        if (errorOnNoActiveShell && !this.hasActiveShell()) {
-            throw new NoActiveShellError();
+        if (errorOnNoActiveShell) {
+            this.errorOnNoActiveShell();
         }
 
         if (this.isExecutingCommand) {
@@ -312,6 +312,15 @@ export class ManimShell {
         }
     }
 
+    /**
+     * Errors if no active shell is found.
+     */
+    public errorOnNoActiveShell() {
+        if (!this.hasActiveShell()) {
+            throw new NoActiveShellError();
+        }
+    }
+
     /**
      * This command should only be used from within the actual `startScene()`
      * method. It starts a new ManimGL scene in the terminal and waits until

src/startStopScene.ts

@@ -111,5 +111,15 @@ export async function startScene(lineStart?: number) {
  * See `forceQuitActiveShell()` for more details.
  */
 export async function exitScene() {
-    await ManimShell.instance.forceQuitActiveShell();
+    try {
+        ManimShell.instance.errorOnNoActiveShell();
+        await ManimShell.instance.forceQuitActiveShell();
+    } catch (error) {
+        if (error instanceof NoActiveShellError) {
+            Window.showWarningMessage("No active Manim session found to quit.");
+            return;
+        }
+        Logger.error(`💥 Error while trying to exit the scene: ${error}`);
+        throw error;
+    }
 }