Passing data between GD.yield() and resume()

[Alikae]

Hi !
I would like to know if there is currently a way to pass data between between GD.yield() and the corresponding resume().
All my tests so far behave as if GD.yield() always return nil, regardless of how I call resume().

Wanted usage:
script a:

b.test()
b.resume('data')

script b:

function test()
a = GD.yield()
print(a) -- print data

Is there something I missed about how to use it ?
Is this maybe not an intended feature ? The wanted behavior is easily reproduced by changing

b.resume('data')

by

b.some_prop = 'data'
b.resume()

Lastly, I came to the sources to try to understand it by myself, but I stumbled upon coroutine.resume and coroutine.yield, that (in my understanding) doesn't seems to be defined anywhere. Does it come from Godot API ? If so, do you know where I can find some documentation about it ? Pretty hard to find Godot documentation that do more than scratching the surface.

[gilzoide]

Hi there!
I thought data was already being passed from resume to the code that yielded, but I'll be honest and say that I haven't tested this flow.
coroutine.resume and coroutine.yield are builtin Lua functions, part of its coroutine implementation.

Is there something I missed about how to use it ?

Not at all, this is a bug.
Most likely the fault is the lack of returning the result of coroutine.yield at the end of GD.yield:

godot-lua-pluginscript/src/late_globals.lua

Lines 132 to 133 in b2100ff

	coroutine_yield(co_obj)
	end

Sorry about that.

I created issue #14 related to this problem. Thanks for the report!

[gilzoide]

#15 should fix this.
If you want, you can download the zip generated by GitHub Actions (https://github.com/gilzoide/godot-lua-pluginscript/actions/runs/1761324506) and install this fixed version in your project. If you do try it out, please tell me if it works ^^