nanuqsaurus/modules/system/nix-core.nix

{ inputs, lib, ... }:

{
  nixpkgs.overlays = [
    (final: prev: {
      nur = import inputs.nur {
        pkgs = final;
        nurpkgs = final;
      };
    })
  ];

  nix.settings = {
    experimental-features = [
      "nix-command"
      "flakes"
    ];

    allowed-users = [
      "root"
      "@wheel"
    ];

    substituters = lib.mkBefore [
      "https://cache.lix.systems"
    ];
    trusted-public-keys = lib.mkBefore [
      "cache.lix.systems:aBnZUw8zA7H35Cz2RyKFVs3H4PlGTLawyY5KRbvJR8o="
    ];
  };

  nixpkgs.config.allowUnfree = true;
  
  programs.nix-ld.enable = true;

  programs.nix-index = {
    enable = lib.mkDefault true;
    enableBashIntegration = lib.mkDefault true;
  };
  programs.nix-index-database.comma.enable = lib.mkDefault true;

  nix.optimise = lib.mkDefault {
    automatic = true;
    dates = [ "daily" ];
  };

  nix.gc = lib.mkDefault {
    automatic = true;
    dates = "daily";
    options = "--delete-older-than 30d";
  };
}