nixfiles/tree/nix.nix

{inputs, ...}: {
  flake.nixosModules.nix-config = {
    nix = {
      registry.nixpkgs.flake = inputs.nixpkgs;
      registry.unstable.flake = inputs.unstable;
      gc = {
        automatic = true;
        dates = "weekly";
        options = "--delete-older-than 7d";
      };
      extraOptions = "gc-keep-outputs = true";
      settings = {
        experimental-features = [
          "nix-command"
          "flakes"
          "auto-allocate-uids"
        ];
        auto-optimise-store = true;
        auto-allocate-uids = true;
        substituters = [
          "https://nix-community.cachix.org"
          "https://callumio-public.cachix.org"
        ];
        trusted-public-keys = [
          "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
          "callumio-public.cachix.org-1:VucOSl7vh44GdqcILwMIeHlI0ufuAnHAl8cO1U/7yhg="
        ];
      };
    };
  };
}