depot/third_party/nixpkgs/maintainers/scripts/haskell/dependencies.nix

# Nix script to calculate the Haskell dependencies of every haskellPackage. Used by ./hydra-report.hs.
let
  pkgs = import ../../.. { };
  inherit (pkgs) lib;
  getDeps =
    _: pkg:
    let
      pname = pkg.pname or null;
    in
    {
      deps = builtins.filter (x: x != null && x != pname) (
        map (x: x.pname or null) (pkg.propagatedBuildInputs or [ ])
      );
      broken = (pkg.meta.hydraPlatforms or [ null ]) == [ ];
    };
in
lib.mapAttrs getDeps pkgs.haskellPackages