Using Reflex Platform to compile a stack project with local packages

Question

I would like to use the work-on script in reflex-platform to compile a project that has been managed using stack until now as explained here.

In the stack.yaml's package list I have a reference to a package located in a local path, something like:

packages:
- '.'
- ../<my_package>

When I run the script I get a strange nix error saying that an anonymous function has been called without a required argument (with the name of the local package).

error: anonymous function at /nix/store/sci0xi7jjwl9krpsp051iry1blz0jaw0-cabal2nix-for-unknown-package/default.nix:1:1 called without required argument ‘my_package’, at /nix/store/wgg4rzg3hyywfd7b0917qmj4617rza7k-nixpkgs-32833c010ecf868826aaa3b60d322bf697f37134-src/pkgs/development/haskell-modules/make-package-set.nix:69:27

How can I tell nix where to find it?

Answer 1

You can add my_package using the package overriding mechanism in haskellPackages, as described in the NixPkgs Manual

The cabal.project file, as used for this purpose, is roughly equivalent to a set of overrides added to haskellPackages. If you're switching entirely to Nix, you can delete the cabal.project when you're done, because it will be obsolete. NixPkgs' haskellPackages does not have a use for it. It only uses cabal-install to build single packages at a time.