Initial commit

modules/nix-settings.nix

@@ -0,0 +1,41 @@
+{ lib, config, ... }:
+with lib;
+let cfg = config.nixSettings;
+in {
+  options.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 = {
+      settings = {
+        trusted-users = [
+          "root"
+          "@wheel"
+        ];
+      };
+      gc = {
+        automatic = cfg.gc.automatic;
+        dates = cfg.gc.dates;
+      };
+      settings.experimental-features = [ "flakes" "nix-command" ];
+    };
+  };
+}