Simplify trying to import files

flake.nix

@@ -8,6 +8,17 @@
   };
 
   outputs = { self, nixpkgs, flake-utils, sops-nix }: (
+    let
+      inherit (nixpkgs) lib;
+      tryFiles = files: default:
+        lib.lists.foldr
+        (a: b:
+          if builtins.pathExists a
+          then a
+          else b)
+        default
+        files;
+    in
       flake-utils.lib.eachDefaultSystem (
         system:
         let
@@ -75,18 +86,7 @@
                     })
                   sops-nix.nixosModules.sops
                   ./lib/configuration.nix
-                (
-                  let
-                    configCandidate = ./lib/machines/${name}.nix;
-                    
-                    machineConfigPath =
-                      if builtins.pathExists configCandidate
-                      then
-                        configCandidate
-                      else
-                        ./lib/hardware/base.nix;
-                  in
-                    machineConfigPath)
+                  (tryFiles [ ./lib/machines/${name}.nix ] ./lib/hardware/base.nix)
                 ];
             })
             systems;