{
  description = "Application packaged using poetry2nix";

  inputs = {
    flake-utils.url = "github:numtide/flake-utils";
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    poetry2nix = {
      url = "github:nix-community/poetry2nix";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs = { self, nixpkgs, flake-utils, poetry2nix }:
    {
      overlays.default = final: prev: {
        huecli = self.packages.${prev.system}.default;
      };
    }
    //
    flake-utils.lib.eachDefaultSystem (system:
      let
        # see https://github.com/nix-community/poetry2nix/tree/master#api for more functions and examples.
        pkgs = nixpkgs.legacyPackages.${system};
        inherit (poetry2nix.lib.mkPoetry2Nix { inherit pkgs; }) mkPoetryApplication defaultPoetryOverrides;
        pypkgs-build-requirements = {
          paho-mqtt = [ "hatch-vcs" ];
        };
        p2n-overrides = defaultPoetryOverrides.extend (final: prev:
          builtins.mapAttrs
            (package: build-requirements:
              (builtins.getAttr package prev).overridePythonAttrs (old: {
                buildInputs = (old.buildInputs or [ ]) ++ (builtins.map (pkg: if builtins.isString pkg then builtins.getAttr pkg prev else pkg) build-requirements);
              })
            )
            pypkgs-build-requirements
        );
      in
      {
        packages = {
          huecli = mkPoetryApplication {
            projectDir = ./.;
            overrides = p2n-overrides;
            nativeBuildInputs = [ pkgs.installShellFiles ];
            postInstall = ''
              installShellCompletion --cmd huecli \
                --bash <($out/bin/huecli --install-completion bash) \
                --zsh <($out/bin/huecli --install-completion zsh) \
                --fish <($out/bin/huecli --install-completion fish)
            '';
          };
          default = self.packages.${system}.huecli;
        };

        devShells.default = pkgs.mkShell {
          inputsFrom = [ self.packages.${system}.huecli ];
          packages = [
            pkgs.ruff
            pkgs.poetry
          ];
        };
      });
}