{
  description = "Downloader Nix Flake";
  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";

  outputs =
    { self, nixpkgs }:
    let
      supportedSystems = [
        "x86_64-linux"
        "aarch64-linux"
        "x86_64-darwin"
        "aarch64-darwin"
      ];
      forEachSupportedSystem =
        f:
        nixpkgs.lib.genAttrs supportedSystems (
          system:
          f {
            pkgs = import nixpkgs { inherit system; };
            lib = nixpkgs.lib;
          }
        );
    in
    {
      devShells = forEachSupportedSystem (
        { pkgs, lib }:
        let
          myPython = pkgs.python313;
        in
        {
          default = pkgs.mkShell {
            packages = with pkgs; [
              myPython
              uv
              ruff # the ruff pip package installs a dynamically linked binary that cannot run on NixOS
              forgejo-runner
            ];
            shellHook = # bash
              ''
                export "UV_PYTHON_PREFERENCE=only-system"
                export "UV_PYTHON_DOWNLOADS=never"
                uv sync --all-groups
                source ./.venv/bin/activate
                export "PYTHONPATH=`pwd`/.venv/${myPython.sitePackages}/:$PYTHONPATH"
                export "PATH=${pkgs.ruff}/bin:$PATH"
              '';
          };
        }
      );
    };
}