Ideas for making a Cats version?

[coltfred]

I have a few projects which are moving to Cats. It'd be nice if we could have a version of this that worked for Cats without slurping in Scalaz.

I can think of a couple options:

1. Duplicate the project, swap out Scalaz for Cats.
2. Write a core with 0 dependencies (reimplementing the needed typeclasses), then provide contrib modules which brought in the needed scalaz or cats version.
3. Use some crazy thing like @tpolecat's yax to ifdef things.

Based on the commit history, I think 1 is probably the best option since the project seems to be changing relatively slowly. Would you agree? Do you have better ideas?

cc/ @bmjames

[tpolecat]

My vote would be to sign on here and create a cats branch and then make it default, and drop scalaz. But if that's unpopular I'm happy to do a fork.

[coltfred]

I'd be fine with that personally. I'm gonna try and get the performance defect fixed up tonight. We'll see if anyone else comments here with a Yea or Nay.

[bmjames]

I have no personal interest in maintaining a Cats version, and I've largely stopped using Scala. I think it would make sense for someone to make a fork and carry the project forward from there. I'm happy to point to it from the README here.

[tpolecat]

Cool maybe we'll do that then.

[johnynek]

Happy to help as I'd like a cats port of this.

[tpolecat]

I'll take a stab at a cats port.

[oscar-stripe]

any news on the cats port?

[tpolecat]

Hey, yeah I made some progress but got wrapped around the axle with TransLift so I'm waiting for the MonadTrans swap. My branch is here.

[johnynek]

One of my colleagues just released this: https://github.com/bkirwi/decline which is a from scratch cats based implementation.

[tpolecat]

Cool, that looks a lot simpler.