{
  description = "A very basic flake";

  inputs = {
    flake-utils = {
      url = "github:numtide/flake-utils";
    };
  };

  outputs = { self, nixpkgs, flake-utils }:
  flake-utils.lib.eachSystem ["x86_64-linux"] (system:
    let pkgs = nixpkgs.legacyPackages.${system};
        hp = nixpkgs.legacyPackages.${system}.haskellPackages.override (old: {
      overrides = pkgs.lib.composeExtensions (old.overrides or (_: _: {})) (f: p: {
        home-assistant-controller = pkgs.haskell.lib.overrideCabal (f.callPackage ./. {}) (_: {
          preBuild = ''
            export COMMIT="${self.rev or "unknown"}"
          '';
        });
      });
    });
    in rec {
      packages.home-assistant-controller = pkgs.haskell.lib.justStaticExecutables hp.home-assistant-controller;
      defaultPackage = packages.home-assistant-controller;
      devShell = hp.shellFor {
        packages = h: [h.home-assistant-controller];
        withHoogle = false;
        buildInputs = with pkgs; [
          cabal-install
          hp.hlint
          cabal2nix
          ghcid

          hp.graphmod

          hp.haskell-language-server
        ];
      };
    }
  );
}