switch to treefmt

flake.lock

@@ -1543,6 +1543,7 @@
         "padtype-unstable": "padtype-unstable",
         "sm64baserom": "sm64baserom",
         "sops-nix": "sops-nix",
+        "treefmt-nix": "treefmt-nix_3",
         "vscode-server": "vscode-server",
         "vscode-server-unstable": "vscode-server-unstable"
       }
@@ -1845,6 +1846,26 @@
         "type": "github"
       }
     },
+    "treefmt-nix_3": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs-unstable"
+        ]
+      },
+      "locked": {
+        "lastModified": 1733662930,
+        "narHash": "sha256-9qOp6jNdezzLMxwwXaXZWPXosHbNqno+f7Ii/xftqZ8=",
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "rev": "357cda84af1d74626afb7fb3bc12d6957167cda9",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "type": "github"
+      }
+    },
     "treefmt_2": {
       "inputs": {
         "nixpkgs": [

flake.nix

@@ -98,6 +98,10 @@
       url = "git+https://git.lix.systems/lix-project/nixos-module.git?ref=stable";
       inputs.nixpkgs.follows = "nixpkgs-unstable";
     };
+    treefmt-nix = {
+      url = "github:numtide/treefmt-nix";
+      inputs.nixpkgs.follows = "nixpkgs-unstable";
+    };
   };
 
   outputs =
@@ -395,20 +399,10 @@
         pkgs-stable = import inputs.nixpkgs nixpkgs-args;
         _plain = mkPlain pkgs-unstable;
         plain = _plain.config.vacu.withAsserts _plain;
+        treefmtEval = inputs.treefmt-nix.lib.evalModule pkgs-unstable ./treefmt.nix;
       in
-      # dnsModule = lib.evalModules {
-      #   modules = [
-      #     {
-      #       config._module.check = false;
-      #       options.vacu.dns = lib.mkOption {
-      #         default = { };
-      #         type = lib.types.attrsOf inputs.dns.lib.types.zone;
-      #       };
-      #     }
-      #   ];
-      # };
       {
-        formatter = pkgs-unstable.nixfmt-rfc-style;
+        formatter = treefmtEval.config.build.wrapper;
         apps.sops = {
           type = "app";
           program = lib.getExe self.packages.${system}.wrappedSops;

treefmt.nix

@@ -0,0 +1,5 @@
+{ ... }:
+{
+  projectRootFile = "flake.nix";
+  programs.nixfmt-rfc-style.enable = true;
+}