Google drive sheets script editor gemme som CSV-fil

Jeg har dette som kan gemme det område der markeres som en CSV-fil. Kan man ændre det så det markerede ark bliver gemt som CSV, uden at man behøver at markere cellerne først?

function saveAsCSV() {
  // Prompts the user for the file name
  var fileName = Browser.inputBox("Save CSV file as (e.g. myCSVFile):");

  // Check that the file name entered wasn't empty
  if (fileName.length !== 0) {
    // Add the ".csv" extension to the file name
    fileName = fileName + ".csv";
    // Convert the range data to CSV format
    var csvFile = convertRangeToCsvFile_(fileName);
    // Create a file in the Docs List with the given name and the CSV data
//DocsList
    DriveApp.createFile(fileName, csvFile);
  }
  else {
    Browser.msgBox("Error: Please enter a CSV file name.");
  }
}

function convertRangeToCsvFile_(csvFileName) {
  //der er redigeret så der bruges ; i stedet for , som seperator
  // Get the selected range in the spreadsheet
  var ws = SpreadsheetApp.getActiveSpreadsheet().getActiveSelection();
  try {
    var data = ws.getValues();
    var csvFile = undefined;

    // Loop through the data in the range and build a string with the CSV data
    if (data.length > 1) {
      var csv = "";
      for (var row = 0; row < data.length; row++) {
        for (var col = 0; col < data[row].length; col++) {
          if (data[row][col].toString().indexOf(";") != -1) {
            data[row][col] = "\"" + data[row][col] + "\"";
          }
        }

        // Join each row's columns
        // Add a carriage return to end of each row, except for the last one
        if (row < data.length-1) {
          csv += data[row].join(";") + "\r\n";
        }
        else {
          csv += data[row];
        }
      }
      csvFile = csv;
    }
    return csvFile;
  }
  catch(err) {
    Logger.log(err);
    Browser.msgBox(err);
  }
}