rework lib and some general changes

lib/nixos.nix

@@ -1,21 +1,35 @@
-{ inputs, lib, pkgs, ... }:
-
-with lib;
 {
-  mkHost = path: attrs@{ system, ... }:
+  inputs,
+  lib,
+  pkgs,
+  self,
+  ...
+}: let
+  inherit (inputs.nixpkgs.lib) nixosSystem;
+  inherit (builtins) baseNameOf elem;
+  inherit (lib.attrsets) filterAttrs;
+  inherit (lib.modules) mkDefault;
+  inherit (lib.strings) removeSuffix;
+  inherit (self.modules) mapModules;
+in rec {
+  mkHost = path: attrs @ {system ? "aarch64-linux", ...}:
     nixosSystem {
       inherit system;
-      specialArgs = { inherit lib inputs system; };
+
+      specialArgs = {inherit lib inputs system;};
+
       modules = [
         {
           nixpkgs.pkgs = pkgs;
-          networking.hostName = mkDefault (removeSuffix ".nix" (baseNameOf path));
+          networking.hostName =
+            mkDefault (removeSuffix ".nix" (baseNameOf path));
         }
-        (filterAttrs (n: v: !elem n [ "system" ]) attrs)
-
-        ../.
-
+        (filterAttrs (n: v: !elem n ["system"]) attrs)
+        ../. # /default.nix
         (import path)
       ];
     };
+
+  mapHosts = dir: attrs @ {system ? system, ...}:
+    mapModules dir (hostPath: mkHost hostPath attrs);
 }