simplify formatter setup

Author: pvsr

flake.nix

@@ -64,7 +64,6 @@
         default = pkgs.mkShell {
           packages = [
             pkgs.ruff
-            pkgs.nixfmt-rfc-style
             (pkgs.python3.withPackages (
               pyproject.renderers.withPackages {
                 python = pkgs.python3;
@@ -83,19 +82,14 @@
       formatter = forAllSystems (
         pkgs:
         pkgs.nixfmt-tree.override {
-          runtimeInputs = with pkgs; [ ruff ];
+          runtimeInputs = [ pkgs.ruff ];
           settings = {
-            on-unmatched = "info";
             tree-root-file = "flake.nix";
             formatter.ruff = {
               command = "ruff";
               options = [ "format" ];
               includes = [ "*.py" ];
             };
-            formatter.nixfmt = {
-              command = "nixfmt";
-              includes = [ "*.nix" ];
-            };
           };
         }
       );