{
    description = "Teaching calendar flake";

    inputs = {
        nixpkgs.url = "github:nixos/nixpkgs/nixos-25.05";
    };

    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; };
        });
    in {
        devShells = forEachSupportedSystem ({ pkgs }: {
            default = pkgs.mkShell rec {
                name = "calendar";
                venvDir = "./.calendar";
                packages = with pkgs; [
                    python3
                    python3Packages.venvShellHook
                    python3Packages.jinja2
                    python3Packages.num2words
                    python3Packages.pyyaml
                ];
#                postVenvCreation = ''
#                    pip install -r ${./requirements.txt}
#                '';
                shellHook = ''
                    venvShellHook
                '';
            };
        });
    };
}