async function openFile(uri) {
    const options = {
        preview: false,
        viewColumn: vscode.ViewColumn.One,
    };
    const workspaceFolder = getWorkspaceUri();
    const docURI = vscode.Uri.joinPath(workspaceFolder, uri.path);
    const files = await vscode.workspace.textDocuments.filter(doc => doc.fileName === docURI.fsPath);
    if (files.length === 0) {
        // no active file, open it and return
        //const doc = await vscode.workspace.openTextDocument(docURI);
        console.log("open", docURI);
        await vscode.commands.executeCommand("vscode.openWith", vscode.Uri.file(docURI.fsPath), 'jupyter-notebook');
        
        // indow.showTextDocument(doc, options);
        return;
    }
    // if we have the window open and it is not active just show it
    for await (const doc of files) {
        if (vscode.window.activeTextEditor?.document.fileName !== doc.fileName) {
            await vscode.commands.executeCommand("vscode.openWith", vscode.Uri.file(docURI.fsPath), 'jupyter-notebook');
        }
    }
}