elm2nix.nix

  exact-dependencies = import ../elm-stuff/exact-dependencies.nix;

  elmStuffPackages = lib.mapAttrs (name: info:
    {
      drv = stdenv.mkDerivation {
        name = lib.replaceChars ["/"] ["-"] name + "-${info.version}";
        src = fetchurl {
          inherit (info) sha256 url;
        };
        phases = [ "unpackPhase" "installPhase" ];
        installPhase = ''
          mkdir -p $out
          cp -r * $out
        '';
        meta.homepage = "https://github.com/${name}/";
      };
      inherit name;
      version = info.version;
    }
  ) exact-dependencies;

  elmPackagesTreeMaker = lib.concatStrings (builtins.map (package: ''
    mkdir -p ${package.name}
    ln -s ${package.drv} ${package.name}/${package.version}
  '') ( lib.attrValues elmStuffPackages ) );

  elm-stuff-packages = stdenv.mkDerivation {
    name = "elm-stuff-packages";
    phases = ["installPhase"];
    installPhase = ''
      mkdir -p $out
      cd $out
      ${elmPackagesTreeMaker}
    '';
  };

  main-js = stdenv.mkDerivation {
    name = "main-js";
    buildInputs = [elmPackages.elm];
    phases = ["buildPhase"];
    buildPhase = ''
      mkdir -p $out/{tmp,elm-stuff}
      cd $out
      ln -s ${elm-stuff-packages} elm-stuff/packages
      ln -s ${../elm-stuff/exact-dependencies.json} elm-stuff/exact-dependencies.json
      ln -s ${../elm-package.json} elm-package.json
      ln -s  ${../Main.elm} Main.elm
      HOME=$out/tmp elm make --output main.js Main.elm
      rm -rf tmp elm-stuff
    '';
  };