lambda to import recursive files on all modules

modules/dev.nix

@@ -1,14 +1,12 @@
 { lib, ... }:
 {
-  imports = [
-    ./dev/sh.nix
-    ./dev/nix.nix
-    ./dev/docker.nix
-    ./dev/python.nix
-    ./dev/haskell.nix
-    ./dev/javascript.nix
-    ./emacs.nix
-  ];
+  imports =
+    let
+      devFiles = builtins.filter (file: builtins.match ".*\\.nix" file != null) (
+        builtins.attrNames (builtins.readDir ./dev)
+      );
+    in
+    map (file: ./dev/${file}) devFiles;
   my.emacs.enable = lib.mkDefault false;
   my.dev = {
     sh.enable = lib.mkDefault false;