= Nix exps
:categories: nix

[source,nix]
----
let
  pkgsOriginal = import <nixpkgs> {};
  pkgsSrc = pkgsOriginal.fetchzip {
    url = "https://github.com/NixOS/nixpkgs/archive/18.03.zip";
    sha256 = "0hk4y2vkgm1qadpsm4b0q1vxq889jhxzjx3ragybrlwwg54mzp4f";
  };
  pkgs = import (pkgsSrc) {};
  stdenv = pkgs.stdenv;

  # Taken from:
  # http://www.cs.yale.edu/homes/lucas.paul/posts/2017-04-10-hakyll-on-nix.html
  websiteBuilder = pkgs.stdenv.mkDerivation {
    name = "website-builder";
    src = ./hakyll;
    phases = "unpackPhase buildPhase";
    buildInputs = [
      (pkgs.haskellPackages.ghcWithPackages (p: with p; [ hakyll ]))
    ];
    buildPhase = ''
      mkdir -p $out/bin
      ghc -O2 -dynamic --make Main.hs -o $out/bin/generate-site
    '';
  };
in rec {
  euandrehWebsite = stdenv.mkDerivation rec {
    name = "euandreh-website";
    src = ./site;
    phases = "unpackPhase buildPhase";
    # version = "0.1";
    buildInputs = [ websiteBuilder ];
    buildPhase = ''
      export LOCALE_ARCHIVE="${pkgs.glibcLocales}/lib/locale/locale-archive";
      export LANG=en_US.UTF-8
      generate-site build

      mkdir $out
      cp -r _site/* $out
    '';
  };
}
----
