dummy.nix

let
  pkgs = import <nixpkgs> {};
  img2ascii-src = pkgs.fetchFromGitHub {
    owner = "Drezil";
    repo = "img2ascii";
    rev = "f60ab724b7af7f5a413ed2e700a22cfe3387cf4a";
    sha256 = "0xqgq38w18mf4ljkyn44zw0vnbci2agq0s9qvw6rirbw42ksiqsj";
  };
  source = builtins.toFile "example.hs" ''
    module Main (main) where

    main :: IO ()
    main = putStrLn "hello world";
  '';
  ghcWithStuff = pkgs.haskellPackages.ghcWithPackages (hsPkgs: [ hsPkgs.JuicyPixels hsPkgs.optparse-applicative ]);
in rec {
  hello-world = builtins.derivation {
    system = builtins.currentSystem;
    name = "raw-ghc";
    builder = "${pkgs.haskellPackages.ghc}/bin/ghc";
    args = [ source "-threaded" "-o" "${builtins.placeholder "out"}" ];
  };
  roseJpg = pkgs.fetchurl {
    url = "https://images.homedepot-static.com/productImages/e350ef76-f7ff-46ee-83d2-606aab23453c/svn/mea-nursery-rose-bushes-62014-64_1000.jpg";
    sha256 = "11abhkr7njl04wr2a8bd3vsyvn5mj9qcgiwcs1rdjkj1nksb5z8p";
  };
  img2ascii = builtins.derivation {
    system = builtins.currentSystem;
    name = "img2ascii";
    builder = "${ghcWithStuff}/bin/ghc";
    args = [ "${img2ascii-src}/src/Main.hs" "-threaded" "-o" "${builtins.placeholder "out"}" "-hidir" "/build" "-odir" "/build" ];
  };
  rose-art = builtins.derivation {
    system = builtins.currentSystem;
    name = "rose-art";
    builder = "${img2ascii}";
    args = [ roseJpg "128" "128" ];
  };
}