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let
  pkgsUnstable = import <nixpkgs> { };
  pkgsPinned = import (pkgsUnstable.fetchzip {
    url = "https://github.com/NixOS/nixpkgs/archive/18.03.zip";
    sha256 = "0hk4y2vkgm1qadpsm4b0q1vxq889jhxzjx3ragybrlwwg54mzp4f";
  }) { };
  pkgs = pkgsUnstable;
  rootSrc = pkgs.nix-gitignore.gitignoreSource [ ] ./.;

  # 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 =
    [ (pkgsPinned.haskellPackages.ghcWithPackages (p: with p; [ hakyll ])) ];
    buildPhase = ''
      mkdir -p $out/bin
      ghc -O2 -dynamic --make Main.hs -o $out/bin/build-site
    '';
  };
in rec {
  utils = import ./utils.nix {
    pkgs = pkgs;
    src = rootSrc;
    baseName = "website";
  };
  subtasks = rec {
    perlPodCheck = utils.baseTask.overrideAttrs (baseAttrs: {
      name = "${baseAttrs.name}-perl-podcheck";
      buildInputs = baseAttrs.buildInputs ++ [ pkgs.perl ];
      buildPhase = ''
        podchecker website pastebin/website-pastebin slides/website-slides
        touch $out
      '';
    });
    batsTest = utils.baseTask.overrideAttrs (baseAttrs: {
      name = "${baseAttrs.name}-bats-test";
      buildInputs = baseAttrs.buildInputs ++ [ pkgs.bats pkgs.perl ];
      buildPhase = ''
        patchShebangs .
        ./t/website.bats
        touch $out
      '';
    });
    perlInternalTest = utils.baseTask.overrideAttrs (baseAttrs: {
      name = "${baseAttrs.name}-perl-test";
      buildInputs = baseAttrs.buildInputs ++ [ pkgs.perl ];
      buildPhase = ''
        patchShebangs .
        ./website test
        touch $out
      '';
    });
    hunspellCheck = utils.baseTask.overrideAttrs (baseAttrs: {
      name = "${baseAttrs.name}-hunspell";
      buildInputs = baseAttrs.buildInputs
      ++ [ (pkgs.hunspellWithDicts (with pkgs.hunspellDicts; [ en-us ])) ];
      buildPhase = ''
        patchShebangs .
        ./spelling/check-spelling.sh "${subtasks.docs}"
        touch $out
      '';
    });
    docs = utils.baseTask.overrideAttrs (baseAttrs: {
      name = "${baseAttrs.name}-docs";
      src = ./site;
      buildInputs = [ websiteBuilder pkgs.pandoc ];
      buildPhase = ''
        export LOCALE_ARCHIVE="${pkgs.glibcLocales}/lib/locale/locale-archive";
        export LANG=en_US.UTF-8

        ls pastebin/*.org | awk -F. '{print $1}' | xargs -I{} pandoc -o {}.html {}.org --standalone

        build-site build

        mkdir $out
        cp -r _site/* $out
      '';
    });
  };
  test = utils.test [
    utils.formatNix
    (utils.shellcheck null)
    (utils.fixme [ "pastebin/skeleton.org" "utils.nix" ])
    subtasks.perlPodCheck
    subtasks.batsTest
    subtasks.perlInternalTest
    subtasks.hunspellCheck
  ];
  shell = pkgs.mkShell rec {
    name = "website-shell";
    buildInputs = [
      websiteBuilder
      (pkgs.haskellPackages.ghcWithPackages (p: with p; [ hakyll ]))
      (pkgs.hunspellWithDicts (with pkgs.hunspellDicts; [ en-us ]))
    ];
  };
  publishScript = utils.publishScript subtasks.docs;
}