refactor(flake, system): improve code structure

Refactor configuration generation

- Inherit lib from nixpkgs
- Rename functions (mkHome -> makeHome, merge -> forEachHost
- Relocate some variables' definitions into config generator functions
- Create separate function to track home-manager modules

flake.nix

@@ -16,49 +16,54 @@
 
     nethack = {
       url = git+https://git.psf.lt/xezo360hye/nethack?shallow=1;
-      #url = git+ssh://git@git.psf.lt/xezo360hye/nethack?shallow=1;
-      #url = path:/home/andrey/nethack;
     };
-
-    # nixpkgs-2405.url = github:nixos/nixpkgs/nixos-24.05;
-    # hm-2405.url = github:nix-community/home-manager/release-24.05;
   };
 
   outputs = { self, nixpkgs, home-manager, nixvim, nethack, ...  } @ inputs:
   let
     inherit (self) outputs;
+    inherit (nixpkgs) lib;
 
     username = "andrey";
     hostnames = [ "tokishiko" "maidena" ];
+    stateVersion = "24.05";
 
-    mkSystem = hostname: {
+    makeSystem = hostname: {
       "${hostname}" = nixpkgs.lib.nixosSystem {
         specialArgs = { inherit inputs; };
-        system = "x86_64-linux";
         modules = [
           ./system/common.nix
           ./system/${hostname}.nix
           ./hardware/${hostname}.nix
+          {
+            system.stateVersion = stateVersion;
+            networking.hostName = hostname;
+          }
         ];
       };
     };
 
-    mkHome = hostname: {
+    extractModule = { homeManagerModules, ... }: homeManagerModules."${lib.head (lib.attrNames homeManagerModules)}";
+    homeManagerModules = map extractModule [ nixvim nethack ];
+    makeHome = hostname: {
       "${username}@${hostname}" = home-manager.lib.homeManagerConfiguration {
         pkgs = nixpkgs.legacyPackages.x86_64-linux;
-        extraSpecialArgs = inputs;
-        modules = [
-          nixvim.homeManagerModules.nixvim
-          nethack.homeManagerModules.nethack
+        modules = homeManagerModules ++ [
           ./home/${hostname}.nix
           ./home/common.nix
+          {
+            news.display = "show";
+            home.username = username;
+            home.homeDirectory = "/home/${username}";
+            home.stateVersion = stateVersion;
+          }
         ];
       };
     };
 
-    merge = fn: nixpkgs.lib.fold nixpkgs.lib.mergeAttrs {} (map fn hostnames);
+    forEachHost = fn: lib.fold lib.mergeAttrs {} (map fn hostnames);
   in {
-    nixosConfigurations = merge mkSystem;
-    homeConfigurations = merge mkHome;
+    nixosConfigurations = forEachHost makeSystem;
+    homeConfigurations = forEachHost makeHome;
   };
 }

home/common.nix

@@ -56,7 +56,6 @@
   };
 
 
-  news.display = "show";
   nixpkgs.config.allowUnfree = true;
 
   home = {
@@ -76,9 +75,5 @@
     sessionVariables = {
       ANI_CLI_PLAYER = "mpv";
     };
-
-    username = "andrey";
-    homeDirectory = "/home/andrey";
-    stateVersion = "24.05";
   };
 }

system/common.nix

@@ -84,8 +84,4 @@ in
       tappingDragLock = false;
     };
   };
-
-
-  # Something important
-  system.stateVersion = "24.05";
 }

system/maidena.nix

@@ -1,13 +1,4 @@
 {
-  inputs,
-  config,
-  pkgs,
-  lib,
-  ...
-}:
-{
-  networking.hostName = "maidena";
-
   services = {
     desktopManager.plasma6.enable = true;
     displayManager.sddm = {

system/tokishiko.nix

@@ -1,12 +1,4 @@
 {
-  inputs,
-  config,
-  pkgs,
-  lib,
-  ...
-}:
-{
-  networking.hostName = "tokishiko";
   console.keyMap = "no";
 
   services = {