nix: replace treefmt with alejandra

flake.lock

@@ -211,8 +211,7 @@
         "flake-parts": "flake-parts",
         "mmsg": "mmsg",
         "nixpkgs": "nixpkgs",
-        "nixpkgs-wayland": "nixpkgs-wayland",
-        "treefmt-nix": "treefmt-nix"
+        "nixpkgs-wayland": "nixpkgs-wayland"
       }
     },
     "systems": {
@@ -229,26 +228,6 @@
         "repo": "default",
         "type": "github"
       }
-    },
-    "treefmt-nix": {
-      "inputs": {
-        "nixpkgs": [
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1749194973,
-        "narHash": "sha256-eEy8cuS0mZ2j/r/FE0/LYBSBcIs/MKOIVakwHVuqTfk=",
-        "owner": "numtide",
-        "repo": "treefmt-nix",
-        "rev": "a05be418a1af1198ca0f63facb13c985db4cb3c5",
-        "type": "github"
-      },
-      "original": {
-        "owner": "numtide",
-        "repo": "treefmt-nix",
-        "type": "github"
-      }
     }
   },
   "root": "root",

flake.nix

@@ -3,10 +3,6 @@
     nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
     nixpkgs-wayland.url = "github:nix-community/nixpkgs-wayland";
     flake-parts.url = "github:hercules-ci/flake-parts";
-    treefmt-nix = {
-      url = "github:numtide/treefmt-nix";
-      inputs.nixpkgs.follows = "nixpkgs";
-    };
     mmsg = {
       url = "github:DreamMaoMao/mmsg";
       inputs.nixpkgs.follows = "nixpkgs";
@@ -16,7 +12,6 @@
   outputs = {
     self,
     flake-parts,
-    treefmt-nix,
     ...
   } @ inputs:
     flake-parts.lib.mkFlake {inherit inputs;} {
@@ -46,7 +41,6 @@
           nativeBuildInputs = old.nativeBuildInputs ++ [];
           buildInputs = old.buildInputs ++ [];
         };
-        treefmtEval = treefmt-nix.lib.evalModule pkgs ./treefmt.nix;
       in {
         packages.default = maomaowm;
         overlayAttrs = {
@@ -56,7 +50,7 @@
           inherit maomaowm;
         };
         devShells.default = maomaowm.overrideAttrs shellOverride;
-        formatter = treefmtEval.config.build.wrapper;
+        formatter = pkgs.alejandra;
       };
       systems = ["x86_64-linux" "aarch64-linux"];
     };

treefmt.nix

@@ -1,8 +0,0 @@
-{ ... }:
-
-{
-  projectRootFile = "flake.nix";
-  programs = {
-    nixfmt.enable = true;
-  };
-}