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{ nixpkgs ? import <nixpkgs> {}, compiler ? "default", doBenchmark ? false }:

let

  inherit (nixpkgs) pkgs;

  f = { mkDerivation, aeson, base, blaze-html, blaze-markup
      , bytestring, cassava, conduit, conferer, conferer-aeson
      , conferer-warp, conferer-yaml, containers, data-default-class
      , directory, either, exceptions, extra, fmt, hoauth2, http-api-data
      , http-media, insert-ordered-containers, lens, lib, monad-logger
      , mtl, path-pieces, persistent, persistent-postgresql
      , prometheus-client, prometheus-metrics-ghc, protocol-buffers
      , protocol-buffers-descriptor, regex-tdfa, resource-pool, servant
      , servant-docs, servant-server, servant-swagger, servant-websockets
      , shakespeare, stm, swagger2, text, time, timezone-olson
      , timezone-series, transformers, unliftio-core, uri-bytestring
      , uuid, vector, vector-algorithms, wai-extra, warp, websockets
      , yesod, yesod-auth, yesod-auth-oauth2, yesod-core, yesod-form
      , zip-archive
      }:
      mkDerivation {
        pname = "tracktrain";
        version = "0.1.0.0";
        src = ./.;
        isLibrary = false;
        isExecutable = true;
        libraryHaskellDepends = [
          aeson base blaze-html blaze-markup bytestring cassava conduit
          conferer conferer-warp containers either exceptions extra fmt
          hoauth2 http-api-data http-media insert-ordered-containers lens
          monad-logger mtl path-pieces persistent persistent-postgresql
          prometheus-client prometheus-metrics-ghc protocol-buffers
          protocol-buffers-descriptor regex-tdfa resource-pool servant
          servant-docs servant-server servant-swagger servant-websockets
          shakespeare stm swagger2 text time timezone-olson timezone-series
          transformers unliftio-core uri-bytestring uuid vector
          vector-algorithms warp websockets yesod yesod-auth
          yesod-auth-oauth2 yesod-core yesod-form zip-archive
        ];
        executableHaskellDepends = [
          aeson base bytestring conferer conferer-aeson conferer-yaml
          data-default-class directory extra fmt monad-logger
          persistent-postgresql protocol-buffers time wai-extra warp
        ];
        doHaddock = false;
        description = "tracktrain tracks trains on their traintracks";
        license = "unknown";
        mainProgram = "tracktrain";
        postInstall = ''
          cp -r $src/assets $out/assets
        '';
        jailbreak = true;
      };

  haskellPackages = if compiler == "default"
                       then pkgs.haskellPackages
                       else pkgs.haskell.packages.${compiler};

  variant = if doBenchmark then pkgs.haskell.lib.doBenchmark else pkgs.lib.id;

  # we can override haskell packages in nix here; but attempt to minimise that
  # since builds get pretty expensive when we do.
  hpkgs = haskellPackages.override {
    overrides = self: super: with pkgs.haskell.lib.compose; {
      conferer-warp = markUnbroken super.conferer-warp;
      protocol-buffers = markUnbroken (overrideSrc {
          src = pkgs.fetchFromGitHub {
            owner = "k-bx";
            repo = "protocol-buffers";
            sha256 = "sha256-Olp02L6ztDkG9sUOQf+kOcaQEMbdhIJyPRkpvxU9v7I=";
            rev = "ae8084f115fbdb699da2b2a163776b1a1167bf0f";
          };
        } super.protocol-buffers);
    };
  };

  drv = variant (hpkgs.callPackage f {});

in with pkgs.haskell.lib;
  justStaticExecutables drv