{
  flake-parts-lib,
  inputs,
  ...
}: {
  flake = {
    templates = {
      build123d = {
        path = ./template;
        description = "A python flake with a build132d parametric cad setup";
      };
    };

    flakeModules.build123d = {
      imports = [
        inputs.treefmt-nix.flakeModule
      ];

      options.perSystem = flake-parts-lib.mkPerSystemOption ({
        lib,
        config,
        pkgs,
        self',
        ...
      }: let
        cfg = config.krantz.build123d;

        python = pkgs.python3.override {
          self = python;
          packageOverrides = pyfinal: pyprev: {
            build123d = pyfinal.callPackage ./packages/build123d.nix {};
            cadquery-ocp = pyfinal.callPackage ./packages/cadquery-ocp.nix {};
            cadquery-ocp-proxy = pyfinal.callPackage ./packages/cadquery-ocp-proxy.nix {};
            ocp-gordon = pyfinal.callPackage ./packages/ocp-gordon.nix {};
            ocpsvg = pyfinal.callPackage ./packages/ocpsvg.nix {};
            trianglesolver = pyfinal.callPackage ./packages/trianglesolver.nix {};
          };
        };
      in {
        options.krantz.build123d = {
          enable = lib.mkEnableOption "building a cargo project with crane";

          # src = lib.mkOption {
          #   description = "The path to the root of the crate.";
          #   type = lib.types.path;
          #   example = lib.literalExpression "./.";
          # };
          # srcFiltered = lib.mkOption {
          #   description = "A path to the filtered directory of the root of the crate.";
          #   type = lib.types.path;
          #   default = craneLib.cleanCargoSource cfg.src;
          #   defaultText = lib.literalExpression "config.krantz.rust.craneLib cfg.src";
          #   example = lib.literalExpression "./.";
          # };
          #
          # runtimeDeps = lib.mkOption {
          #   description = "Packages needed for the app to run.";
          #   type = lib.types.listOf lib.types.package;
          #   default = [];
          #   example = with pkgs; [
          #     openssl
          #   ];
          # };
          # buildDeps = lib.mkOption {
          #   description = "Packages needed for the app to build.";
          #   type = lib.types.listOf lib.types.package;
          #   default = [];
          #   example = with pkgs; [
          #     pkg-config
          #     rustPlatform.bindgenHook
          #   ];
          # };
          # devDeps = lib.mkOption {
          #   description = "Packages to include only in the devShell.";
          #   type = lib.types.listOf lib.types.package;
          #   default = with pkgs; [
          #     rust-analyzer
          #   ];
          # };
          #
          # devShell = {
          #   enable = lib.mkEnableOption "a rust development environment" // {default = true;};
          #
          #   name = lib.mkOption {
          #     description = "The name of the attribute in devShells to configure";
          #     type = lib.types.str;
          #     default = "default";
          #     example = "rust";
          #   };
          #
          #   extraAttrs = lib.mkOption {
          #     description = "Extra attributes to merge into the devshell. See https://crane.dev/API.html#cranelibdevshell";
          #     type = lib.types.attrs;
          #     default = {};
          #     example = {
          #       shellHook = ''
          #         export DEBUG=1
          #       '';
          #     };
          #   };
          # };
          #
          # package = {
          #   enable = lib.mkEnableOption "the compiled cargo project" // {default = true;};
          #
          #   name = lib.mkOption {
          #     description = "The name of the attribute in packages to configure";
          #     type = lib.types.str;
          #     default = "default";
          #     example = "lib";
          #   };
          #
          #   extraAttrs = lib.mkOption {
          #     description = "Extra attributes to merge into the package. See https://crane.dev/API.html#cranelibbuildpackage";
          #     type = lib.types.attrs;
          #     default = {};
          #     example = {
          #       doCheck = false;
          #     };
          #   };
          # };
          #
          # craneLib = lib.mkOption {
          #   description = "The crane lib instance this module is using. Useful for overriding options";
          #   default = craneLib;
          #   defaultText = lib.literalExpression "crane.mkLib pkgs";
          #   readOnly = true;
          # };
        };

        config = lib.mkIf cfg.enable {
          # Dev Shell that lets you enter an environment with all the necessary utilites
          # Available through 'nix develop'
          # Also can be activated automatically if direnv is installed on the system with 'direnv allow'
          # devShells.${cfg.devShell.name} = lib.mkIf cfg.devShell.enable (pkgs.mkShell {
          #     # extra tooling dependencies
          #     packages = cfg.devDeps;
          #
          #     inputsFrom = [self'.packages.${cfg.package.name}];
          #   }
          #   // cfg.devShell.extraAttrs);
          devShells.default = pkgs.mkShell {
            # extra tooling dependencies
            packages = [
              (python.withPackages (p:
                with p; [
                  build123d
                ]))
            ];
          };

          # Formatter for nix files, available through 'nix fmt'
          treefmt = {
            programs.alejandra.enable = lib.mkDefault true;
          };

          # Your custom packages
          # Accessible through 'nix build', 'nix shell', 'nix run', etc
          # packages.${cfg.package.name} = lib.mkIf cfg.package.enable ( {
          #     inherit src buildInputs nativeBuildInputs cargoArtifacts;
          #   }
          #   // cfg.package.extraAttrs);
        };
      });
    };
  };
}