Add error message for importing with no active editor

Author: TIny-Hacker

CHANGELOG.md

@@ -2,6 +2,12 @@
 
 All notable changes to the "ti-basic" extension will be documented in this file.
 
+## [1.0.3] - 2024-05-15
+
+### Added
+
+- Error message if no text editor is open when importing a file.
+
 ## [1.0.2] - 2024-04-11
 
 ### Fixed

src/extension.js

@@ -26,6 +26,12 @@ function activate(context) {
 				console.log('Selected file: ' + fileUri[0].fsPath);
 				const editor = vscode.window.activeTextEditor;
 
+				if (editor == undefined) {
+					console.error('No text editor active. Create a new file first, then try again.');
+					vscode.window.showErrorMessage('Error: No text editor active. Create a new file first, then try again.');
+					return;
+				}
+
 				if (editor && lib) {
 					let prgm;