diff --git a/.gitignore b/.gitignore
index fa507cf..237cc52 100644
--- a/.gitignore
+++ b/.gitignore
@@ -16,3 +16,5 @@ cabal.project.local*
 dist*/
 report.html
 *.bak
+.direnv/
+.envrc
diff --git a/default.nix b/default.nix
deleted file mode 100644
index 225fc5f..0000000
--- a/default.nix
+++ /dev/null
@@ -1,18 +0,0 @@
-{ pkgs ? import <nixpkgs> (import (builtins.fetchTarball https://github.com/input-output-hk/haskell.nix/archive/master.tar.gz))
-, haskellCompiler ? "ghc865"
-}:
-  pkgs.haskell-nix.cabalProject {
-    src = pkgs.haskell-nix.haskellLib.cleanGit { src = pkgs.nix-gitignore.gitignoreSource [] ./.; };
-    ghc = pkgs.buildPackages.pkgs.haskell-nix.compiler.${haskellCompiler};
-    # pkg-def-extras = [
-    #   # Additional packages ontop of all those listed in `cabal.project`
-    # ];
-    # modules = [
-    #   # Specific package overrides would go here for example:
-    #   packages.cbors.package.ghcOptions = "-Werror";
-    #   packages.cbors.patches = [ ./one.patch ];
-    #   packages.cbors.flags.optimize-gmp = false;
-    #   # It may be better to set flags in `cabal.project` instead
-    #   # (`plan-to-nix` will include them as defaults).
-    # ];
-  }
diff --git a/shell.nix b/shell.nix
index 9451c76..a4f6bdd 100644
--- a/shell.nix
+++ b/shell.nix
@@ -1,125 +1,7 @@
-{ nixpkgs ? import <nixpkgs> {}, compiler ? "default", doBenchmark ? false }:
+{ pkgs ? import <nixpkgs> {}}:
 
 let
-
-  inherit (nixpkgs) pkgs;
-
-  nanovg = with haskellPackages; callPackage (
-    { mkDerivation, base, bytestring, c2hs, containers, glew
-    , hspec, inline-c, libGL, libGLU, QuickCheck, stdenv, text, vector
-    }:
-    mkDerivation {
-      pname = "nanovg";
-      version = "0.6.0.0";
-      sha256 = "e35a2772f2a2e71916013cab70eeb8eedd6f66b5490ddf7ce237c8c76895d496";
-      revision = "1";
-      editedCabalFile = "1lhfsq50r9bdby7mfscw8ih3wsz2m19lr2a2z9b6diaf5kz76vij";
-      isLibrary = true;
-      isExecutable = true;
-      doCheck = false;
-      libraryHaskellDepends = [ base bytestring containers text vector ];
-      librarySystemDepends = [ glew libGL libGLU ];
-      libraryPkgconfigDepends = [ glew ];
-      libraryToolDepends = [ c2hs ];
-      testHaskellDepends = [ base containers hspec inline-c QuickCheck ];
-      homepage = "https://github.com/cocreature/nanovg-hs";
-      description = "Haskell bindings for nanovg";
-      license = stdenv.lib.licenses.isc;
-    }) {};
-
-  glib = with haskellPackages; callPackage(
-    { mkDerivation, base, bytestring, Cabal, containers, glib
-    , stdenv, text, utf8-string, gtk2hs-buildtools
-    }:
-    mkDerivation {
-      pname = "glib";
-      version = "0.13.8.0";
-      sha256 = "9cce6fb44e3c30de2bd330a6902955e3a5fce7b6e9ce41a4afb70e3a7d6e61a2";
-      setupHaskellDepends = [ base Cabal gtk2hs-buildtools ];
-      libraryHaskellDepends = [
-        base bytestring containers text utf8-string
-      ];
-      libraryPkgconfigDepends = [ pkgs.glib ];
-      homepage = "http://projects.haskell.org/gtk2hs/";
-      description = "Binding to the GLIB library for Gtk2Hs";
-      license = stdenv.lib.licenses.lgpl21;
-    }) {};
-
-  #gtk2hs-buildtools = with haskellPackages; callPackage(
-  #  { mkDerivation, alex, array, base, Cabal, containers, directory
-  #  , filepath, happy, hashtables, pretty, process, random, stdenv
-  #  }:
-  #  mkDerivation {
-  #    pname = "gtk2hs-buildtools";
-  #    version = "0.13.4.0";
-  #    src = ../gtk2hs/tools;
-  #    isLibrary = true;
-  #    isExecutable = true;
-  #    enableSeparateDataOutput = true;
-  #    libraryHaskellDepends = [
-  #      array base Cabal containers directory filepath hashtables pretty
-  #      process random
-  #    ];
-  #    libraryToolDepends = [ alex happy ];
-  #    executableHaskellDepends = [ base ];
-  #    homepage = "http://projects.haskell.org/gtk2hs/";
-  #    description = "Tools to build the Gtk2Hs suite of User Interface libraries";
-  #    license = stdenv.lib.licenses.gpl2;
-  #  }) {};
-
-  sdl2 = with haskellPackages; callPackage(
-    { mkDerivation, base, bytestring, deepseq, exceptions, linear, SDL2
-    , StateVar, stdenv, text, transformers, vector, weigh
-    }:
-    mkDerivation {
-      pname = "sdl2";
-      version = "2.5.1.0";
-      sha256 = "fc1d3d4276b2c4f835a5311075abb240385aae7edad8760f6bda55ed8271ed20";
-      isLibrary = true;
-      isExecutable = true;
-      enableSeparateDataOutput = true;
-      libraryHaskellDepends = [
-        base bytestring exceptions linear StateVar text transformers vector
-      ];
-      librarySystemDepends = [ SDL2 ];
-      libraryPkgconfigDepends = [ SDL2 ];
-      testHaskellDepends = [ base deepseq linear vector weigh ];
-      description = "Both high- and low-level bindings to the SDL library (version 2.0.6+).";
-      license = stdenv.lib.licenses.bsd3;
-      doCheck = false;
-    }) {};
-
-  f = { mkDerivation, base, bytestring, clock, containers, deepseq
-      , linear, matrix, monad-loops, monad-parallel, mtl
-      , OpenGL, OpenGLRaw, random, stdenv, stm, text, uuid, vector
-      }:
-      mkDerivation {
-        pname = "affection";
-        version = "0.0.0.9";
-        src = ./.;
-        configureFlags = [ "-fexamples" ];
-        isLibrary = true;
-        isExecutable = true;
-        libraryHaskellDepends = [
-          base bytestring clock containers glib linear monad-loops
-          monad-parallel mtl OpenGL OpenGLRaw sdl2 stm text uuid vector
-        ];
-        executableHaskellDepends = [
-          base containers deepseq linear matrix nanovg OpenGL random sdl2 stm
-        ];
-        homepage = "https://github.com/nek0/affection#readme";
-        description = "A simple Game Engine using SDL";
-        license = stdenv.lib.licenses.lgpl3;
-      };
-
-  haskellPackages = if compiler == "default"
-                       then pkgs.haskellPackages
-                       else pkgs.haskell.packages.${compiler};
-
-  variant = if doBenchmark then pkgs.haskell.lib.doBenchmark else pkgs.lib.id;
-
-  drv = variant (haskellPackages.callPackage f {});
-
+  affection = pkgs.haskellPackages.callCabal2nix "affection" (gitignore ./.) {};
+  gitignore = dir: pkgs.nix-gitignore.gitignoreSource [] dir;
 in
-
-  if pkgs.lib.inNixShell then drv.env else drv
+  affection.env