/// <summary>
/// Gets a help message for the <see cref="Command"/>.
/// This method can be overridden to provide a command specific message.
/// See the <see cref="GetSubCommandsMessage"/> and the <see cref="GetParametersMessage"/> methods.
/// Messages can be combined using the + (plus) operator.
/// </summary>
/// <returns>A help <see cref="Message"/> for this <see cref="Command"/>.</returns>
protected internal virtual Message GetHelpMessage()
{
var message = Message.NoError;
if (subcommands.Any())
{
message += new Message("Commands:") + GetSubCommandsMessage(2);
}
if (parameters.Any())
{
message += new Message("Parameters:") + GetParametersMessage(2);
}
return(message);
}