switched modules to flakes

flake.nix

@@ -4,9 +4,17 @@
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
 
+    nixos-modules = {
+      url = "github:SuperSandro2000/nixos-modules";
+      inputs.nixpkgs-lib.follows = "nixpkgs";
+    };
+
     sops-nix = {
       url = "github:Mic92/sops-nix";
-      inputs.nixpkgs.follows = "nixpkgs";
+      inputs = {
+        nixpkgs.follows = "nixpkgs";
+        nixpkgs-stable.follows = "nixpkgs";
+      };
     };
 
     nix-index-database = {
@@ -15,33 +23,36 @@
     };
   };
 
-  outputs = { nixpkgs, nix-index-database, sops-nix, ... }: {
-    src = builtins.filterSource (path: type: type == "directory" || lib.hasSuffix ".nix" (baseNameOf path)) ./.;
-    ls = dir: lib.attrNames (builtins.readDir (src + "/${dir}"));
-    fileList = dir: map (file: ./. + "/${dir}/${file}") (ls dir);
+  outputs = { nixpkgs, nixos-modules, nix-index-database, sops-nix, ... }:
+  let
+    inherit (nixpkgs) lib;
+  in {
     nixosConfigurations = let
       constructSystem = {
         hostname,
         system ? "x86_64-linux",
         modules ? [],
         users ? [],
-      }: nixpkgs.lib.nixosSystem {
-        inherit system hostname;
+      }: lib.nixosSystem {
+        inherit system;
+
         modules = [
+          nixos-modules.nixosModule
           sops-nix.nixosModules.sops
           nix-index-database.nixosModules.nix-index
-          ./system/programs.nix
-          ./system/configuration.nix
-          ./system/${hostname}/configuration.nix
-        ] ++ fileList "modules" ++ modules ++ map (user: ./users/${user}/default.nix ) users;
+          ./systems/programs.nix
+          ./systems/configuration.nix
+          ./systems/${hostname}/configuration.nix
+        ] ++ modules ++ map(user: ./users/${user}) users;
+
       };
     in {
       photon = constructSystem {
-        hostname = "photon"
+        hostname = "photon";
       };
 
       palatine-hill = constructSystem {
-        hostname = "palatine-hill"
+        hostname = "palatine-hill";
       };
     };
   };