diff --git a/flake.nix b/flake.nix
index c9d99ad..95e2364 100644
--- a/flake.nix
+++ b/flake.nix
@@ -22,33 +22,24 @@
       inherit (inputs.nixpkgs) lib;
       pkgs = inputs.nixpkgs.legacyPackages.${system};
       treefmtEval = inputs.treefmt-nix.lib.evalModule pkgs ./treefmt.nix;
+
+      runtimeDeps = with pkgs; [
+        # mason / tree-sitter
+        gcc
+        cargo
+        nodejs
+
+        # telescope
+        ripgrep
+        fd
+      ];
+      src = lib.fileset.toSource {
+        fileset = lib.fileset.fileFilter (file: file.hasExt "lua") ./.;
+        root = ./.;
+      };
     in {
       ### nix {run,shell,build}
-      packages.default = let
-        runtimeDeps = with pkgs; [
-          # mason / tree-sitter
-          gcc
-          cargo
-          nodejs
-
-          # telescope
-          ripgrep
-          fd
-        ];
-
-        src = lib.fileset.toSource {
-          fileset = lib.fileset.fileFilter (file: file.hasExt "lua") ./.;
-          root = ./.;
-        };
-      in
-        pkgs.wrapNeovimUnstable pkgs.neovim-unwrapped
-        (pkgs.neovimUtils.makeNeovimConfig {
-            customRC = ''
-              set runtimepath^=${src}
-              source ${src}/init.lua
-            '';
-          }
-          // {wrapperArgs = ["--prefix" "PATH" ":" "${lib.makeBinPath runtimeDeps}"];});
+      packages.default = pkgs.callPackage ./package.nix {inherit runtimeDeps src;};
 
       ### nix fmt
       formatter = treefmtEval.config.build.wrapper;
diff --git a/package.nix b/package.nix
new file mode 100644
index 0000000..d9ff22a
--- /dev/null
+++ b/package.nix
@@ -0,0 +1,18 @@
+{
+  lib,
+  wrapNeovimUnstable,
+  neovim-unwrapped,
+  neovimUtils,
+  runtimeDeps ? null,
+  src ? null,
+  ...
+} @ args:
+wrapNeovimUnstable neovim-unwrapped (neovimUtils.makeNeovimConfig args
+  // {
+    # FIXME: append instead of override the entire wrapperArgs
+    wrapperArgs = ["--prefix" "PATH" ":" "${lib.makeBinPath runtimeDeps}"];
+    luaRcContent = ''
+      vim.cmd [[set runtimepath^=${src}]]
+      ${builtins.readFile "${src}/init.lua"}
+    '';
+  })