add home manager configs

radish/home/custom-pkgs/util.nix

@@ -0,0 +1,16 @@
+dir:
+{
+  vimPlugin = { name, source }:
+    final: prev: {
+      vimPlugins = prev.vimPlugins // {
+        "${dir}" = prev.vimUtils.buildVimPlugin {
+          pname = name;
+          version = source.lastModifiedDate;
+          src = source;
+          doCheck = false;
+        };
+      };
+    };
+
+  package = final: prev: { "${dir}" = final.callPackage ./${dir}/package.nix { pkgs = prev; }; };
+}