apecs-hint-demo VS hint

Assuming you've succeeded this far, the real challenge is going to be to give the interpreted code access to your game's types. It is imperative to define those in a separate library from the package which calls hint. With stack and cabal, it then suffices to point hint to the package database in which that library is installed. I just created an example repo demonstrating how to use this inside a small apecs program: https://github.com/gelisam/apecs-hint-demo

Mueval is based on hint, which is in turn based on the ghc library.

Yeah, that project is pretty much at the bottom of my list, unfortunately. My top projects these days are mgmt, klister, recursion-schemes, and hint... And that's already too much!

You can try using hint (instead of ghci) though I'm not sure it has the breakpoint functionality.

Have you tried hint?

with haskell.nix, well, you've found the github issue, you need to put the apecs package in the right nix incantation.

But the use case for that is for using a Haskell program A to catch errors in that same Haskell program A. For your use case, using a Haskell program A to automatically grade a Haskell program B, I recommend using the hint library instead, as it allows you to load code from external source files, run tests on them, and manipulate the error messages produced by ghc. (full disclosure: I am the maintainer of that library)

I am thinking of giving hint the ability to evaluate TemplateHaskell expressions. It would indeed be quite difficult to write an interpreter for all of Haskell, so my plan is to use the Exp's Show instance to produce a program which constructs and then splices that Exp, e.g. $(pure (InfixE (Just (LitE (IntegerL 1))) (VarE GHC.Num.+) (Just (LitE (IntegerL 1))))) is a Haskell expression which is equivalent to 1 + 1, so I should be able to ask hint to evaluate that to get 2 without having to write my own Haskell interpreter.

Yes please! Right now all of my open-source projects (most notably hint and recursion-schemes) are about to drop into barely-updated mode, and while I knew this would happen and have been working towards finding co-maintainers, I am now realizing that it wasn't enough. I think such a website would definitely have helped, and I am hoping that once it launches, I'll be able to use it to find some co-maintainers to tide over my projects until I become available again.

hint's API takes a string, not an AST (I plan to fix this). Internally, hint delegates to the ghc library, which does expose a parser which you can use if you want. hint exists to provide a friendlier API than the ghc library for interpreting Haskell code, but it does not expose a friendlier API for parsing Haskell code.