{
  description = "Application packaged using poetry2nix";

  inputs.flake-utils.url = "github:numtide/flake-utils";
  inputs.nixpkgs.url = "github:NixOS/nixpkgs";
  inputs.poetry2nix.url = "github:nix-community/poetry2nix";

  outputs = { self, nixpkgs, flake-utils, poetry2nix }: {
    overlay = nixpkgs.lib.composeManyExtensions [
      poetry2nix.overlay
      (final: prev: {
        frontpage = prev.poetry2nix.mkPoetryApplication {
          python = prev.python39;
          projectDir = ./.;
        };
      })
    ];

    nixosModules = rec {
      default = frontpage;
      frontpage = import ./nixos;
    };
  } // (flake-utils.lib.eachDefaultSystem (system:
    let pkgs = import nixpkgs { inherit system; overlays = [ self.overlay ]; }; in
    {
      apps = {
        frontpage = pkgs.frontpage;
      };

      defaultApp = pkgs.frontpage;

      devShell = (pkgs.poetry2nix.mkPoetryEnv {
        python = pkgs.python39;
        projectDir = ./.;
        extraPackages = ps: [ ps.python-lsp-server ];
      }).env;
    }));
}