add new external flake to provide helper functions

modules/global/nixos.nix

@@ -0,0 +1,94 @@
+{ inputs, self, ... }: {
+  flake.nixosModules.global = { pkgs, config, lib, ... }: {
+    system.stateVersion = config.info.stateVersion;
+
+    nix = {
+      settings.experimental-features = [
+        "nix-command"
+        "flakes"
+      ];
+
+      gc = {
+        automatic = true;
+        persistent = true;
+        dates = "Sun 05:00";
+      };
+    };
+
+    boot.loader.efi.canTouchEfiVariables = true;
+
+    networking = {
+      networkmanager.enable = true;
+      hostName = config.info.hostName;
+    };
+
+    time.timeZone = "Europe/London";
+    i18n = {
+      defaultLocale = "en_GB.UTF-8";
+      extraLocaleSettings = with config.i18n; {
+        LC_ADDRESS = defaultLocale;
+        LC_IDENTIFICATION = defaultLocale;
+        LC_MEASUREMENT = defaultLocale;
+        LC_MONETARY = defaultLocale;
+        LC_NAME = defaultLocale;
+        LC_NUMERIC = defaultLocale;
+        LC_PAPER = defaultLocale;
+        LC_TELEPHONE = defaultLocale;
+        LC_TIME = defaultLocale;
+      };
+    };
+
+    services.xserver.xkb = {
+      layout = "gb";
+      variant = "";
+    };
+
+    console.keyMap = "uk";
+
+    users.users."grey" = {
+      isNormalUser = true;
+      description = "grey";
+      extraGroups = [ "networkmanager" "wheel" ];
+    };
+
+    nixpkgs.config.allowUnfree = true;
+
+    environment.systemPackages = with pkgs; [
+      git
+      fzf
+      jq
+      busybox
+      ethtool
+      hyperfine
+    ] ++ config.features.applications.extraPackages;
+
+    programs = {
+      nano = {
+        enable = true;
+        nanorc = ''
+          set nowrap
+          set tabstospaces
+          set tabsize 2
+        '';
+      };
+
+      gnupg.agent = {
+        enable = true;
+      };
+    };
+
+    hardware.bluetooth = {
+      enable = true;
+      powerOnBoot = false;
+    };
+
+    home-manager.users.grey = lib.mkIf (config.features.nixos.home-manager.enable) {
+      info = {
+        rootPath = lib.mkDefault config.info.rootPath;
+        hostName = lib.mkDefault config.info.hostName;
+        stateVersion = lib.mkDefault config.info.stateVersion;
+        isStandalone = lib.mkDefault false;
+      };
+    };
+  };
+}