public static void ShowUsageForAll()
{
var cmdTypes = AssemblySearcher
.GetCommandClasses()
.OrderBy(t => AssemblySearcher.GetCommandName(t));
//foreach type get the names of the parameters and create a printout
foreach (var type in cmdTypes)
{
var cmdName = AssemblySearcher.GetCommandName(type);
Console.WriteLine($"{cmdName} command");
var desc = type.GetCustomAttributes(typeof(CommandClassAttribute), false).Cast <CommandClassAttribute>().First().ShortDescription;
if (desc?.Length > 0)
{
Console.WriteLine(desc);
}
Console.WriteLine($"usage:");
foreach (var method in AssemblySearcher.GetCommandMethods(type))
{
var handlerDesc = method.GetCustomAttributes(typeof(CommandHandlerAttribute), false).Cast <CommandHandlerAttribute>().First().ShortDescription;
StringBuilder sb = new StringBuilder();
sb.Append(cmdName).Append(" ");
foreach (var param in method.GetParameters())
{
sb.Append(param.Name).Append(" ");
}
Console.WriteLine($" {sb,-60} {handlerDesc}");
}
Console.WriteLine("\n");
}
}
private void InvokeHandlerMethod(object cmd, IEnumerable <string> paramArgs)
{
var possibleHandlerMethods = AssemblySearcher.GetCommandMethods(cmd.GetType(), paramArgs.Count());
//Temporary exception condition. Eventually we will just try multiple handlers starting with
//the most specific signatures (the one that requires the most type conversion)
if (possibleHandlerMethods.Count() > 1)
{
throw new Exception("Multiple handlers exist with the same signature. Could not determine which handler to call.");
}
if (possibleHandlerMethods.Count() < 1)
{
throw new Exception("No handler was found for the given arguments.");
}
var handlerMethod = possibleHandlerMethods.First();
List <object> convertedParams = ConvertParams(handlerMethod.GetParameters(), paramArgs);
handlerMethod.Invoke(cmd, convertedParams.ToArray());
}