{
  inputs.nixpkgs.url = "github:nixos/nixpkgs/nixos-24.05";
  inputs.pre-commit-hooks.url = "github:cachix/pre-commit-hooks.nix";
  inputs.pre-commit-hooks.inputs.nixpkgs.follows = "nixpkgs";

  outputs = {
    self,
    nixpkgs,
    pre-commit-hooks,
    ...
  }: let
    systems = ["aarch64-linux" "aarch64-darwin" "x86_64-darwin" "x86_64-linux"];
    forSystems = nixpkgs.lib.genAttrs systems;
    pkgsFor = system: (import nixpkgs {inherit system;});
    genPkgs = func: (forSystems (system: func (pkgsFor system)));
    pkg = callee: overrides: genPkgs (pkgs: pkgs.callPackage callee overrides);
  in {
    formatter = genPkgs (p: p.alejandra);

    checks = pkg ({system}: {
      pre-commit-check = pre-commit-hooks.lib.${system}.run {
        src = ./.;
        hooks = {
          alejandra.enable = true;
        };
      };
    }) {};

    devShells = pkg ({
      system,
      mkShell,
      nil,
      alejandra,
      udisks2,
      clang,
      qmk,
    }: {
      qmk = mkShell {
        buildInputs = [
          nil
          alejandra
          udisks2
          qmk
          clang
        ];
        # inherit (self.outputs.checks.${system}.pre-commit-check) shellHook;

        shellHook = ''
          # TODO: maybe check that qmk has been setup first?
          mkdir ~/qmk_firmware/keyboards/keebio/iris_ce/keymaps/lytedev
          cp ./rules.mk ~/qmk_firmware/keyboards/keebio/iris_ce/keymaps/lytedev
          cp ./keymap.c ~/qmk_firmware/keyboards/keebio/iris_ce/keymaps/lytedev
          echo "You can compile this firmware with"
          echo "  qmk compile --keyboard keebio/iris_ce/rev1 -km lytedev"
          echo
          echo "You can flash this firmware with"
          echo "  qmk flash --keyboard keebio/iris_ce/rev1 -km lytedev"
        '';
      };

      default = self.outputs.devShells.${system}.qmk;
    }) {};

    # packages = forAllSystems (system: import ./pkgs {pkgs = nixpkgs.legacyPackages.${system};});
    # overlays = import ./overlays self;
    # nixosModules = import ./modules/nixos;
    # homeManagerModules = import ./modules/home-manager;
    # nixosConfigurations = import ./nixos;
    # homeConfigurations = import ./home
    # templates = import ./templates;
  };
}