public void Execute(ArgumentList arguments, TaskList tasks, TagList tags, TagFolder folder)
{
ILister lister = new Lister();
if (arguments.GetParameter(arguments.GetLength() - 1) == "--export")
lister = new HtmlLister();
if (arguments.GetLength() == 1 || arguments.GetParameter(1) == "--export")
lister.ListNotDone(tasks.FilterDue("past"), string.Empty);
else if (arguments.GetParameter(1) == "today")
lister.ListNotDone(tasks.FilterDue("today"), string.Empty);
else if (arguments.GetParameter(1) == "thisWeek")
lister.ListNotDone(tasks.FilterDue("thisWeek"), string.Empty);
else if (arguments.GetParameter(1) == "nextWeek")
lister.ListNotDone(tasks.FilterDue("nextWeek"), string.Empty);
}