major refactor

mod/common/default.nix

@@ -0,0 +1,71 @@
+{
+  var,
+  inputs,
+  lib,
+  config,
+  ...
+}:
+with lib;
+{
+  options.hd.common.enable = mkOption {
+    type = types.bool;
+    default = true;
+    description = "Common options that are used on every host by default.";
+  };
+
+  options.hd.common = {
+    locale = {
+      enable = mkOption {
+        type = types.bool;
+        default = config.hd.common.enable;
+        description = "Enable locale settings";
+      };
+    };
+
+    nix = {
+      enable = mkOption {
+        type = types.bool;
+        default = config.hd.common.enable;
+        description = "Enable Nix-related configuration";
+      };
+    };
+
+    security = {
+      enable = mkOption {
+        type = types.bool;
+        default = config.hd.common.enable;
+        description = "Enable security-related configuration";
+      };
+    };
+
+    shell = {
+      enable = mkOption {
+        type = types.bool;
+        default = config.hd.common.enable;
+        description = "Enable basic shell utilities";
+      };
+    };
+
+    users = {
+      enable = mkOption {
+        type = types.bool;
+        default = config.hd.common.enable;
+        description = "Enable default user accounts";
+      };
+    };
+  };
+
+  imports = [
+    inputs.agenix.nixosModules.default
+    ./locale.nix
+    ./nix.nix
+    ./security.nix
+    ./shell.nix
+    ./users.nix
+  ];
+
+  config = mkIf config.hd.common.enable {
+    environment.defaultPackages = [ ];
+    networking.extraHosts = var.lan-dns.hostsFile;
+  };
+}