let
  sources = import ./nix/sources.nix;
  pkgs = import sources.nixpkgs {};
  inherit (import sources.gitignore { inherit (pkgs) lib; }) gitignoreSource;

  stdenv = pkgs.stdenv;

  python3Packages = pkgs.python3Packages;
  buildPythonPackage = python3Packages.buildPythonPackage;
  fetchPypi = python3Packages.fetchPypi;

  lunr = buildPythonPackage rec {
    pname = "lunr";
    version = "0.5.8";

    src = fetchPypi {
      inherit pname version;
      sha256 = "0vn2j5iyy40sv0f4v8nin5n5xs4a020g6gcbcgfpbxzgk0xhdyy4";
    };

    propagatedBuildInputs = with python3Packages; [
      future
      six
    ];

    checkInputs = with python3Packages; [
      mock
      pytest
    ];
  };

  # FIXME: use nixpkgs’s mkdocs once it is ≥1.1
  mkdocs = buildPythonPackage rec {
    pname = "mkdocs";
    version = "1.1.2";

    src = fetchPypi {
      inherit pname version;
      sha256 = "0fgv5zawpyyv0vd4j5y8m4h058lh9jkwfcm0xy4pg7dr09a1xdph";
    };

    propagatedBuildInputs = (with python3Packages; [
      backports_tempfile
      click
      jinja2
      livereload
      markdown
      nltk
      pyyaml
      tornado
    ]) ++ [
      lunr
    ];

    doCheck = false; # circular depdendency
  };

  pymdown-extensions = buildPythonPackage rec {
    pname = "pymdown-extensions";
    version = "8.0.1";

    src = fetchPypi {
      inherit pname version;
      sha256 = "07p5xks6qf73nbv0qb7jrspkpmxdyr7dpxv3rnkh9p2b5l2h99wv";
    };

    propagatedBuildInputs = with python3Packages; [
      markdown
    ];

    doCheck = false; # they fail?
  };

  mkdocs-material-extensions = buildPythonPackage rec {
    pname = "mkdocs-material-extensions";
    version = "1.0.1";

    src = fetchPypi {
      inherit pname version;
      sha256 = "13y617sql4hqs376c3dfcb6v7q41km9x7fh52k3f74a2brzzniv9";
    };

    # circular dependency
    doCheck = false;
    postPatch = ''
      sed -i 's/mkdocs-material>=5.0.0//' requirements/project.txt
    '';
  };

  mkdocs-material = buildPythonPackage rec {
    pname = "mkdocs-material";
    version = "6.1.2";

    src = fetchPypi {
      inherit pname version;
      sha256 = "0yifc1df94rsaxy72hqnhjkv4c50c30j5kg0yxybkxy07p7kafic";
    };

    propagatedBuildInputs = (with python3Packages; [
      markdown
      pygments
    ]) ++ [
      mkdocs
      mkdocs-material-extensions
      pymdown-extensions
    ];
  };

  iosevka-web = stdenv.mkDerivation rec {
    pname = "iosevka-web";
    version = "3.7.1";

    src = pkgs.fetchzip {
      url = "https://github.com/be5invis/Iosevka/releases/download/v${version}/pkg-iosevka-${version}.zip";
      sha256 = "0d012aqfnyqlpl4smfa2x2qz2qmbbfxb6jr4awv8gp6r359rc9k1";
      stripRoot = false;
    };

    dontBuild = true;

    installPhase = ''
      mkdir -p $out
      cp -r woff woff2 ttf *.css $out
    '';
  };
in
stdenv.mkDerivation {
  name = "wiki";

  src = gitignoreSource ./.;

  buildPhase = "mkdocs build -d $out";

  installPhase = ''
    mkdir -p $out/assets/fonts
    ln -s ${iosevka-web} $out/assets/fonts/iosevka
  '';

  nativeBuildInputs = [
    mkdocs
    mkdocs-material
  ];
}