Make config merging smarter

default.nix

@@ -8,7 +8,20 @@
 
 }: let
 
-  config = (import ./config/default.nix) // hostConfig ;
+  recursiveMerge = with pkgs.lib; attrList:
+    let f = attrPath:
+      zipAttrsWith (n: values:
+        if tail values == []
+          then head values
+        else if all isList values
+          then unique (concatLists values)
+        else if all isAttrs values
+          then f (attrPath ++ [n]) values
+        else last values
+      );
+    in f [] attrList;
+
+  config = recursiveMerge [ (import ./config/default.nix) hostConfig ];
 
 in rec {