{
  description = "Skynet Presentations";

  inputs = {
    nixpkgs.url = "nixpkgs/nixos-unstable";
    utils.url = "github:numtide/flake-utils";

    # nix flake lock --update-input bfom
    bfom.url = "gitlab:silver_rust/bfom";
  };

  /*
  sudo nano /etc/nix/nix.conf
  trusted-users = {username}
  */
  nixConfig = {
    extra-substituters = "https://nix-cache.skynet.ie/skynet-cache";
    extra-trusted-public-keys = "skynet-cache:OdfA4Or0JcHiHf05fsiIR4nZT2z2yDEtkoLqhntGAz4=";
  };

  outputs = {
    self,
    nixpkgs,
    utils,
    bfom,
    ...
  }: utils.lib.eachDefaultSystem (
      system: let
        pkgs = (import nixpkgs) {
          inherit system;
        };

        dependencies = with pkgs; [
          # For teh presentations themselves
          presenterm

          # for exporting
          (pkgs.python3.withPackages (python-pkgs: with python-pkgs; [
            # for exporting
            weasyprint
          ]))
          # various languages to embed in it
          ## Java
          # zulu24
          ## C
          # gcc
          ## rust
          # cargo
          # rustc
          ## lua
          # lua
          ## racket
          # racket
          ## go
          # go
        ];
      in rec {
        # `nix develop`
        devShell = pkgs.mkShell {
          packages = dependencies;
          PRESENTERM_CONFIG_FILE = "config.yaml";
        };

         packages.default = pkgs.stdenv.mkDerivation {
           name = "slides.skynet.ie";
           src = self;
         nativeBuildInputs = dependencies;
         buildInputs = dependencies;
           buildPhase = ''
            # first pass through to get teh old files
            ${bfom.defaultPackage.x86_64-linux}/bin/cargo-bfom

            # then look into ./slides
            export PRESENTERM_CONFIG_FILE=config.yaml
            # recursively find each one then --export-html to ./build/slides/
            shopt -s globstar
            for source in slides/**/*.md; do
              echo $source
              output="$(dirname "$source")/$(basename "$source" .md).html"
              echo $output
              presenterm --export-html "$source"
              mkdir -p "build/$(dirname "$source")"
              cp "$output" "build/$output"
            done
            shopt -u globstar
           '';
           installPhase = "mkdir -p $out; cp -R build/* $out";
         };
     });
#  @ inputs: let
#    pkgs = nixpkgs.legacyPackages.x86_64-linux.pkgs;
#  in {
#    # `nix build`
#    packages.x86_64-linux.default = pkgs.stdenv.mkDerivation {
#      name = "slides.skynet.ie";
#      src = self;
#      buildPhase = "${bfom.defaultPackage.x86_64-linux}/bin/cargo-bfom";
#      installPhase = "mkdir -p $out; cp -R build/* $out";
#    };
#
#    devShells.x86_64-linux.default = pkgs.mkShell {
#      name = "Skynet presentations env";
#      nativeBuildInputs = [
#        bfom.defaultPackage.x86_64-linux
#      ];
#    };
#  };
}