refactor(nix): use treefmt support in pre-commit-hooks

flake-parts/formatting.nix

@@ -13,15 +13,11 @@
       pkgs.rustfmt
     ];
 
-    # wrap treefmt to provide the correct PATH with all formatters
-    treefmt = pkgs.stdenv.mkDerivation {
+    treefmt = pkgs.writeShellApplication {
       name = "treefmt";
-      buildInputs = [pkgs.makeWrapper];
-      buildCommand = ''
-        makeWrapper \
-          ${pkgs.treefmt}/bin/treefmt \
-          $out/bin/treefmt \
-          --prefix PATH : ${lib.makeBinPath formatters}
+      runtimeInputs = [pkgs.treefmt] ++ formatters;
+      text = ''
+        exec treefmt "$@"
       '';
     };
   in {

flake-parts/pre-commit.nix

@@ -11,15 +11,10 @@
       settings = {
         src = ../.;
         hooks = {
-          treefmt = {
-            enable = true;
-            name = "treefmt";
-            description = "format the code";
-            types = ["file"];
-            pass_filenames = true;
-            entry = "${self'.packages.treefmt}/bin/treefmt";
-          };
+          treefmt.enable = true;
         };
+
+        settings.treefmt.package = self'.packages.treefmt;
       };
     };
   };