voidconf/modules/nix-settings.nix

{ lib, config, ... }:
with lib;
let cfg = config.voidconf.nixSettings;
in {
  options.voidconf.nixSettings = {
    gc = {
      automatic = mkOption {
        type = types.bool;
        default = true;
        description = "Enables automatic garbage collection";
      };
      dates = mkOption {
        type = types.str;
        default = "weekly";
        example = "03:15";
        description = mdDoc ''
          How often or when garbage collection is performed. For most desktop and server systems
          a sufficient garbage collection is once a week.

          The format is described in
          {manpage}`systemd.time(7)`.
        '';
      };
    };
  };
  config = {
    nix = {
      optimise.automatic = true;
      settings = {
        trusted-users = [
          "root"
          "@wheel"
        ];
      };
      gc = {
        automatic = cfg.gc.automatic;
        dates = cfg.gc.dates;
      };
      settings.experimental-features = [ "flakes" "nix-command" ];
    };
  };
}