Add a separate file for the try-files function

flake.nix

@@ -30,14 +30,7 @@
       };
 
       systems = builtins.mapAttrs (name: value: defaultMachine // value) machines;
-      tryFiles = files: default:
-        lib.lists.foldr
-        (a: b:
-          if (a != null) && (builtins.pathExists a)
-          then a
-          else b)
-        default
-        files;
+      tryFiles = import ./lib/utils/try-files.nix { inherit lib; };
     in
       flake-utils.lib.eachDefaultSystem (
         system:

lib/utils/try-files.nix

@@ -0,0 +1,9 @@
+{ lib, ... }:
+  files: default:
+    lib.lists.foldr
+    (a: b:
+      if (a != null) && (builtins.pathExists a)
+      then a
+      else b)
+    default
+    files