shell.nix

{ nixpkgs ? import <nixpkgs> { overlays = [(self: super: {gsl = super.gsl.overrideAttrs (o: {CFLAGS = "-DDEBUG";});})]; }
, compiler ? "ghc822"
, doBenchmark ? false }:

let

  inherit (nixpkgs) pkgs;

f = { mkDerivation, ad, array, base, bytestring, cassava, containers
    , datasets, diagrams-lib, diagrams-rasterific, foldl, Frames, ghc-prim, gsl
    , hmatrix, hmatrix-gsl
    , inline-r, lens, mtl, pipes, plots, random-fu, R, random-source
    , stdenv, template-haskell, text, typelits-witnesses, vector, vinyl }:

# hmatrix-gsl = hmatrix-gsl.overrideAttrs (oldAttrs: rec {
#   src = nixpkgs.fetchgit {
#     url = git://github.com/albertoruiz/hmatrix;
#     rev = "d83b17190029c11e3ab8b504e5cdc917f5863120";
#     sha256 = "3b2de54224963ee17857a9737b65d49edc423e06ad7e9c9b85d9f69ca923676a";
#   };
# });

mkDerivation {
  pname = "variational";
  version = "0.1.0.0";
  src = ./.;
  isLibrary = false;
  isExecutable = true;
  executableHaskellDepends = [
    ad
    array
    base
    bytestring
    cassava
    containers
    datasets
    diagrams-lib
    diagrams-rasterific
    foldl
    Frames
    ghc-prim
    hmatrix
    # patched-hmatrix-gsl
    hmatrix-gsl
    inline-r
    lens
    mtl
    pipes
    plots
    random-fu
    random-source
    template-haskell
    text
    typelits-witnesses
    vector
    vinyl
  ];
  executableSystemDepends = [
    gsl
    R
    pkgs.rPackages.anytime
    pkgs.rPackages.ggplot2
    pkgs.rPackages.maptools
    pkgs.rPackages.reshape2
    pkgs.rPackages.rgeos
    pkgs.rPackages.rgdal
    pkgs.rPackages.rstan ];
  license = stdenv.lib.licenses.bsd3;
};

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 {});

in

  if pkgs.lib.inNixShell then drv.env else drv