Use newer nixfmt

checks/default.nix

@@ -1,33 +1,21 @@
-{
-  inputs,
-  self,
-  lib,
-  ...
-}: {
-  imports = [
-    inputs.treefmt-nix.flakeModule
-    inputs.pre-commit-hooks.flakeModule
-  ];
+{ inputs, self, lib, ... }: {
+  imports = [ inputs.treefmt-nix.flakeModule inputs.git-hooks-nix.flakeModule ];
 
-  perSystem = _: {
+  perSystem = { pkgs, ... }: {
     treefmt.config = {
       projectRootFile = ".git/config";
-      programs.alejandra.enable = true;
+      programs.nixfmt.enable = true;
     };
 
-    pre-commit.settings.hooks = {
-      alejandra.enable = true;
-      # deadnix.enable = true;
-      # statix.enable = true;
-    };
+    pre-commit.settings.hooks = { nixfmt.enable = true; };
+
+    formatter = pkgs.nixfmt-rfc-style;
   };
 
-  flake.checks = let
-    build = _: nc: nc.config.system.build.toplevel;
+  flake.checks = let build = _: nc: nc.config.system.build.toplevel;
   in {
-    x86_64-linux = lib.mapAttrs build {
-      inherit (self.nixosConfigurations) picard;
-    };
+    x86_64-linux =
+      lib.mapAttrs build { inherit (self.nixosConfigurations) picard; };
     aarch64-linux = lib.mapAttrs build {
       inherit (self.nixosConfigurations) sisko; # pbp;
     };

flake.lock

@@ -241,10 +241,33 @@
         "type": "github"
       }
     },
+    "git-hooks-nix": {
+      "inputs": {
+        "flake-compat": "flake-compat",
+        "gitignore": "gitignore",
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "nixpkgs-stable": "nixpkgs-stable"
+      },
+      "locked": {
+        "lastModified": 1726745158,
+        "narHash": "sha256-D5AegvGoEjt4rkKedmxlSEmC+nNLMBPWFxvmYnVLhjk=",
+        "owner": "cachix",
+        "repo": "git-hooks.nix",
+        "rev": "4e743a6920eab45e8ba0fbe49dc459f1423a4b74",
+        "type": "github"
+      },
+      "original": {
+        "owner": "cachix",
+        "repo": "git-hooks.nix",
+        "type": "github"
+      }
+    },
     "gitignore": {
       "inputs": {
         "nixpkgs": [
-          "pre-commit-hooks",
+          "git-hooks-nix",
           "nixpkgs"
         ]
       },
@@ -675,11 +698,11 @@
     },
     "nixpkgs-stable": {
       "locked": {
-        "lastModified": 1726447378,
-        "narHash": "sha256-2yV8nmYE1p9lfmLHhOCbYwQC/W8WYfGQABoGzJOb1JQ=",
+        "lastModified": 1720386169,
+        "narHash": "sha256-NGKVY4PjzwAa4upkGtAMz1npHGoRzWotlSnVlqI40mo=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "086b448a5d54fd117f4dc2dee55c9f0ff461bdc1",
+        "rev": "194846768975b7ad2c4988bdb82572c00222c0d7",
         "type": "github"
       },
       "original": {
@@ -851,29 +874,6 @@
         "type": "gitlab"
       }
     },
-    "pre-commit-hooks": {
-      "inputs": {
-        "flake-compat": "flake-compat",
-        "gitignore": "gitignore",
-        "nixpkgs": [
-          "nixpkgs"
-        ],
-        "nixpkgs-stable": "nixpkgs-stable"
-      },
-      "locked": {
-        "lastModified": 1725513492,
-        "narHash": "sha256-tyMUA6NgJSvvQuzB7A1Sf8+0XCHyfSPRx/b00o6K0uo=",
-        "owner": "cachix",
-        "repo": "pre-commit-hooks.nix",
-        "rev": "7570de7b9b504cfe92025dd1be797bf546f66528",
-        "type": "github"
-      },
-      "original": {
-        "owner": "cachix",
-        "repo": "pre-commit-hooks.nix",
-        "type": "github"
-      }
-    },
     "purescript-overlay": {
       "inputs": {
         "nixpkgs": [
@@ -944,6 +944,7 @@
         "disko": "disko",
         "dream2nix": "dream2nix",
         "flakeParts": "flakeParts",
+        "git-hooks-nix": "git-hooks-nix",
         "homeManager": "homeManager",
         "homeManagerGitWorkspace": "homeManagerGitWorkspace",
         "impermanence": "impermanence",
@@ -955,7 +956,6 @@
         "nixThePlanet": "nixThePlanet",
         "nixosHardware": "nixosHardware",
         "nixpkgs": "nixpkgs_5",
-        "pre-commit-hooks": "pre-commit-hooks",
         "rock5b": "rock5b",
         "treefmt-nix": "treefmt-nix_2",
         "vscode-server": "vscode-server"

flake.nix

@@ -1,5 +1,6 @@
 {
-  description = "A complete, declarative, and reproducible configuration of my entire Nix fleet";
+  description =
+    "A complete, declarative, and reproducible configuration of my entire Nix fleet";
 
   inputs = {
     flakeParts.url = "github:hercules-ci/flake-parts";
@@ -20,8 +21,8 @@
       url = "github:nix-community/disko";
       inputs.nixpkgs.follows = "nixpkgs";
     };
-    pre-commit-hooks = {
-      url = "github:cachix/pre-commit-hooks.nix";
+    git-hooks-nix = {
+      url = "github:cachix/git-hooks.nix";
       inputs.nixpkgs.follows = "nixpkgs";
     };
     agenix.url = "github:ryantm/agenix";

shell/default.nix

@@ -1,9 +1,5 @@
-{inputs, ...}: {
-  perSystem = {
-    pkgs,
-    config,
-    ...
-  }: {
+{
+  perSystem = { pkgs, config, ... }: {
     devShells.default = pkgs.mkShell {
       name = "fleet-shell";
       buildInputs = with pkgs; [