Restructure to focus on nix.

lib/utils.nix

@@ -0,0 +1,47 @@
+rec {
+  findNixFiles = dir: let
+    inherit (builtins) attrNames readDir pathExists concatMap;
+
+    # Helper function to build full paths
+    fullPath = name: dir + "/${name}";
+
+    # Get directory contents
+    contents = readDir dir;
+
+    # Convert contents attrset to list of names
+    names = attrNames contents;
+
+    # Filter and process each item
+    processItem = name: let
+      path = fullPath name;
+      type = contents.${name};
+    in
+      if type == "regular" && hasSuffix "nix" name
+      then [path]
+      else if type == "directory" && pathExists path
+      then findNixFiles path
+      else [];
+  in
+    concatMap processItem names;
+
+  getName = filename: let
+    parts = builtins.split "\\." filename;
+    base = builtins.head (builtins.split "\\." filename);
+  in
+    if builtins.length parts == 1
+    then filename
+    else base;
+
+  getSuffix = filename: let
+    parts = builtins.split "\\." filename;
+    end = builtins.tail (builtins.split "\\." filename);
+  in
+    if builtins.length parts == 1
+    then filename
+    else builtins.elemAt end (builtins.length end - 1);
+
+  hasSuffix = suffix: filename:
+    if (getSuffix filename) == suffix
+    then true
+    else false;
+}