I have a finished mod which I made with the intention of it being good for skyblock, and would like to add drops from my mod to sieves (when Creatio is present, of course). Is there an API I can use to do this?

Thanks, that was what I needed.

Take a look at these compat classes. They get called from our registry manager.

Edit: too slow.

If you guys have the time, would you mind helping me with something? I have the support for Creatio implemented, but I can't get it to compile/run... (I assume it's an issue with my build.gradle file, because I have no real idea what I'm doing with it; just winging it based on other repos I see and the comments in the default file)

This is the error I'm getting:

FAILURE: Build failed with an exception.

* What went wrong:
Could not resolve all dependencies for configuration ':provided'.
> Could not find exnihilocreatio:exnihilocreatio:1.12-0.1.5.
  Searched in the following locations:
      http://files.minecraftforge.net/maven/exnihilocreatio/exnihilocreatio/1.12-0.1.5/exnihilocreatio-1.12-0.1.5.pom
      http://files.minecraftforge.net/maven/exnihilocreatio/exnihilocreatio/1.12-0.1.5/exnihilocreatio-1.12-0.1.5.jar
      https://repo1.maven.org/maven2/exnihilocreatio/exnihilocreatio/1.12-0.1.5/exnihilocreatio-1.12-0.1.5.pom
      https://repo1.maven.org/maven2/exnihilocreatio/exnihilocreatio/1.12-0.1.5/exnihilocreatio-1.12-0.1.5.jar
      https://libraries.minecraft.net/exnihilocreatio/exnihilocreatio/1.12-0.1.5/exnihilocreatio-1.12-0.1.5.pom
      https://libraries.minecraft.net/exnihilocreatio/exnihilocreatio/1.12-0.1.5/exnihilocreatio-1.12-0.1.5.jar
      file:/C:/Users/Mackenzie/.gradle/caches/minecraft/deobfedDeps/exnihilocreatio/exnihilocreatio/1.12-0.1.5/exnihilocreatio-1.12-0.1.5.pom
      file:/C:/Users/Mackenzie/.gradle/caches/minecraft/deobfedDeps/exnihilocreatio/exnihilocreatio/1.12-0.1.5/exnihilocreatio-1.12-0.1.5.jar
      file:/C:/Users/Mackenzie/.gradle/caches/minecraft/net/minecraftforge/forge/1.12.2-14.23.1.2555/snapshot/20171003/exnihilocreatio-1.12-0.1.5.jar
      file:/C:/Users/Mackenzie/.gradle/caches/minecraft/net/minecraftforge/forge/1.12.2-14.23.1.2555/snapshot/20171003/exnihilocreatio.jar
  Required by:
      yuudaari.souls:souls:1.12.2-1.0.0-cbb5870

And this is the repo: https://github.com/Yuudaari/Souls

I have the provided line commented out currently because that's what makes it not work. I tried all of the dependency types as well, deobfCompile, compile, etc, but they all throw basically the same error. I assume I'm missing something really simple but I can't figure it out.

Thank you for your time.

You don't seem to have the blame jared maven as a dependency

Aha, thanks, that helped a ton! I didn't realise that libs/ was separate from compilation, and that I needed to reference a maven. Once I referenced that the error changed to not referencing the mavens of Creatio's dependencies, so all I needed to do was copy those mavens from your build.gradle. It works!

Thanks again!

I know I said this was working but turns out it actually doesn't... Idk how I managed to not test it or something.

https://github.com/Yuudaari/soulus/blob/master/src/main/java/yuudaari/soulus/common/compat/ExNihiloCreatio.java

Do you guys see any issue with this? The blocks aren't even siftable with the flint mesh...
It's called in postInit, and it does it for sure, I've tried logging in here. Afterwards I also tried logging the results:

for (Siftable s : ExNihiloRegistryManager.SIEVE_REGISTRY.getDrops(new BlockInfo(Blocks.DIRT, 0))) {
	Logger.info(s.getDrop().getItem().getRegistryName().toString());
}

And my recipes appear. It's almost like the list is being reset after I'm done, but where would I use this api besides postInit?

[edit]: nvm, I figured it out!