Create separate module for controlling software

lib/modules/software.nix

@@ -0,0 +1,69 @@
+{ lib, config, ... }:
+  let
+    inherit (lib)
+      mkOption
+      types
+    ;
+
+    cfg = config.valhalla;
+  in {
+    options = {
+      valhalla = {
+        software =
+          let
+            inherit (cfg.software)
+              common
+              school
+            ;
+          in {
+            essential = mkOption {
+              type = types.bool;
+              description = "A value indicating whether essentials should be installed.";
+              default = true;
+            };
+
+            common = mkOption {
+              type = types.bool;
+              description = "A value indicating whether common software should be installed.";
+              default = true;
+            };
+
+            school = mkOption {
+              type = types.bool;
+              description = "A value indicating whether software for studies should be installed.";
+              default = false;
+            };
+
+            productivity = mkOption {
+              type = types.bool;
+              description = "A value indicating whether productivity apps should be installed.";
+              default = common || school;
+            };
+
+            socialMedia = mkOption {
+              type = types.bool;
+              description = "A value indicating whether social media apps should be installed.";
+              default = common;
+            };
+
+            media = mkOption {
+              type = types.bool;
+              description = "A value indicating whether media apps should be installed.";
+              default = common;
+            };
+
+            gaming = mkOption {
+              type = types.bool;
+              description = "A value indicating whether gaming apps should be installed.";
+              default = common;
+            };
+
+            coding = mkOption {
+              type = types.bool;
+              description = "A value indicating whether development apps should be installed.";
+              default = common;
+            };
+          };
+      };
+    };
+  }

lib/modules/valhalla.nix

@@ -1,16 +1,15 @@
-{ lib, config, ... }:
+{ lib, ... }:
   let
     inherit (lib)
       mkOption
       types
     ;
-
-    cfg = config.valhalla;
   in {
     imports = [
       ./git.nix
       ./i18n.nix
       ./partition.nix
+      ./software.nix
     ];
 
     options = {
@@ -46,62 +45,6 @@
           description = "The X11 keyboard layout of the system.";
           default = null;
         };
-
-        software =
-          let
-            inherit (cfg.software)
-              common
-              school
-            ;
-          in {
-            essential = mkOption {
-              type = types.bool;
-              description = "A value indicating whether essentials should be installed.";
-              default = true;
-            };
-
-            common = mkOption {
-              type = types.bool;
-              description = "A value indicating whether common software should be installed.";
-              default = true;
-            };
-
-            school = mkOption {
-              type = types.bool;
-              description = "A value indicating whether software for studies should be installed.";
-              default = false;
-            };
-
-            productivity = mkOption {
-              type = types.bool;
-              description = "A value indicating whether productivity apps should be installed.";
-              default = common || school;
-            };
-
-            socialMedia = mkOption {
-              type = types.bool;
-              description = "A value indicating whether social media apps should be installed.";
-              default = common;
-            };
-
-            media = mkOption {
-              type = types.bool;
-              description = "A value indicating whether media apps should be installed.";
-              default = common;
-            };
-
-            gaming = mkOption {
-              type = types.bool;
-              description = "A value indicating whether gaming apps should be installed.";
-              default = common;
-            };
-
-            coding = mkOption {
-              type = types.bool;
-              description = "A value indicating whether development apps should be installed.";
-              default = common;
-            };
-          };
       };
     };
   }