parameters with argument should throw error if arment is omitted

[sheam]

If my parameter requires an argument, I would like an error to be thrown if that argument is not supplied.

I tried detecting this in the callback, but the callback never gets called if the argument is not supplied. Essentially it treats it as if the parameter was never supplied.

i.e.,

If the 't' parameter requires a numeric value and should be called like: myapp.exe -t 5, but
myapp.exe -t
is the same as
myapp.exe.

This can lead to some unexpected behavior.

[siywilliams]

I think I might add a OnError callback that gets called when a problem is found with the setup switch.

For example:

fclp.Setup<int>("id")
   .Required()
   .OnError(Exception e => Console.WriteLine(e.ToString));

For now you can access any errors that occurred during the parsing process in the result object:

ICommandLineParserResult result = fclp.Parse(args);

if(result.HasErrors) {
   foreach(var error in result.Errors) {
      Console.WriteLine(error.ToString());
   }
}

[codingyourlife]

I'm new to this command line parser but quite like it so far. This feature is really missing.

Also required parameters should somehow be indicated when using SetupHelp(). The workaround works but the ToString() message only shows the exception name which could be smarter I guess.