executeScriptGlobal return value

[gcarlton]

I'm starting to use lua and cegui together. I've found executeScriptGlobal requires the function to return an integer, otherwise it throws an exception. I find this behaviour somewhat constricting - for instance, many functions I would like to call do not return any value, and I don't like the idea of modifying the lua scripts to do so, just to discard that number after I call it.

There are several ways to generalise this behaviour.
1. Add a bool 2nd argument which is whether a return value is expected.
2. Allow nothing to be returned, in which case the integer is a default value, perhaps specified as a 2nd argument.
3. Have variations for functions that require several different types of returns (void, int and string are the obvious ones).
4. Have a general function which converts the 1st return value to a string, allowing the user to extract it as they see fit.
5. Return a vector of strings for all possible return values.
6. At the very least, throw a certain type of exception that can be caught and discarded (although that is a very fudgy solution).

[lindquist]

I agree that that interface currently is'nt optimal. I basically filled out the abstract ScriptModule to the point back then.

The least intrusive way I think would be to just detect the return value and if nil return 0 otherwise expect an integer.

Another thing I've been wanting to add is control of the return value for event subscribers.