setup for using cabal-install as buildinputs

default.nix

{ nixpkgs ? import <nixpkgs> {}
, compiler ? "ghc822"
}:

let
  inherit (nixpkgs) pkgs;
  
  newCabal = import ./nixdeps/cabal.nix;

  haskellPackages = pkgs.haskell.packages.${compiler};

  modifiedHaskellPackages = haskellPackages.override {
    overrides = newPackages: oldPackages: {
      Cabal         = newPackages.callCabal2nix "Cabal" "${newCabal}/Cabal" {};
      cabal-install = newPackages.callCabal2nix "cabal-install" "${newCabal}/cabal-install" {};
      text          = newPackages.callCabal2nix "text" (import ./nixdeps/text.nix) {};
      parsec        = newPackages.callCabal2nix "parsec" (import ./nixdeps/parsec.nix) {};
      hashable      = newPackages.callCabal2nix "hashable" (import ./nixdeps/hashable.nix) {};
      HUnit         = newPackages.callCabal2nix "hunit" (import ./nixdeps/hunit.nix) {};

    };
  };
  cabal-install = modifiedHaskellPackages.cabal-install;
  Cabal = modifiedHaskellPackages.Cabal;

in
  pkgs.stdenv.mkDerivation rec {
    name = "abc";
    src  = ./.;
    buildInputs = [cabal-install];
  }