{
  lib,
  stdenv,
  fetchFromGitHub,
  buildGoModule,
  hugo,
  cacert,
  
  pkgs,
  
  matrixSpecSrc
}:
let
  src = matrixSpecSrc;

  version = src.shortRev or (builtins.substring 0 7 src.dirtyRev);
  rev = src.rev or src.dirtyRev;
in
buildGoModule {
  inherit version;
  pname = "matrix-spec";
  src = src;
  vendorHash = "sha256-4f04IS76JtH+I4Xpu6gF8JQSO3TM7p56mCs8BwyPo8U=";
  buildInputs = [ cacert ];

  nativeBuildInputs = [ hugo ];
  # Nix doesn't play well with Hugo's "GitInfo" module, so disable it and inject
  # the revision from the flake.
  postPatch = ''
#    substituteInPlace ./site/layouts/shortcodes/gitinfo.html \
#      --replace "{{ .Page.GitInfo.Hash }}" "${rev}"

#    substituteInPlace ./config/_default/config.yaml \
#      --replace "enableGitInfo: true" "enableGitInfo: false"
    ${lib.getExe pkgs.lsd} -lAh .
  '';

  # Generate the Hugo site before building the Go application which embeds the
  # built site.
  preBuild = ''
    hugo --minify --gc --cleanDestinationDir -d spec
  '';

  ldflags = [ "-X main.commit=${rev}" ];

  # Rename the main executable in the output directory
  postInstall = ''
    mv $out/bin/jnsgr.uk $out/bin/jnsgruk
  '';

  meta.mainProgram = "jnsgruk";
}