initial

system/nix.nix

@@ -0,0 +1,33 @@
+{
+  pkgs,
+  lib,
+  config,
+  ...
+}:
+
+let
+  name = "nix";
+  cfg = config.nixowos.system.${name};
+in
+{
+  options.nixowos.system.${name} = {
+    enable = lib.mkEnableOption name;
+  };
+
+  config = lib.mkIf cfg.enable {
+    # enable useful nix tools, and the flakes system
+    nix.settings.experimental-features = "nix-command flakes";
+    # you (should) never need this
+    nix.channel.enable = false;
+
+    # reduces disk usage of the nix store
+    # It does this by performing `nix store optimize` incrementally for each new path
+    # source: https://nix.dev/manual/nix/2.26/command-ref/new-cli/nix3-store-optimise
+    nix.settings.auto-optimise-store = true;
+
+    environment.systemPackages = with pkgs; [
+      nixd
+      nixfmt
+    ];
+  };
+}