/// <summary>Handler for the help command. Displays the list of available commands.</summary>
/// <param name="arguments"></param>
protected virtual void Help(IList <string> arguments)
{
switch (arguments.Count)
{
case 1: Output.WriteLine(String.Join(" ", commandInterpreter.CommandNames.OrderBy(c => c).ToArray())); break;
case 2: Output.Write(commandInterpreter.DescribeInvoke(arguments[1])); break;
case 3: Output.Write(commandInterpreter.DescribeInvoke(arguments[1], arguments[2])); break;
default: throw new Exception("Invalid arguments");
}
}