update

flake.nix

@@ -4,25 +4,59 @@
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
     flake-parts.url = "github:hercules-ci/flake-parts";
+    hooks = {
+      url = "github:cachix/git-hooks.nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+    treefmt = {
+      url = "github:numtide/treefmt-nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
   };
 
-  outputs = {
-    self,
-    nixpkgs,
-    flake-parts,
-  } @ inputs:
-    flake-parts.lib.mkFlake {inherit inputs;} {
+  outputs =
+    {
+      self,
+      nixpkgs,
+      flake-parts,
+      hooks,
+      treefmt,
+    }@inputs:
+    flake-parts.lib.mkFlake { inherit inputs; } {
+      imports = [
+        hooks.flakeModule
+        treefmt.flakeModule
+      ];
+
       systems = nixpkgs.lib.systems.flakeExposed;
 
-      perSystem = {lib, pkgs, ...}: {
-        packages = let
-          packages = lib.packagesFromDirectoryRecursive {
-            inherit (pkgs) callPackage;
-            directory = ./packages;
+      perSystem =
+        {
+          config,
+          pkgs,
+          ...
+        }:
+        {
+          treefmt = {
+            projectRootFile = "flake.nix";
+
+            programs.nixfmt = {
+              enable = true;
+              package = pkgs.nixfmt-rfc-style;
+            };
           };
-        in packages // {
-          default = packages.helix;
+
+          pre-commit.settings.hooks = {
+            treefmt.enable = true;
+          };
+
+          devShells.default = pkgs.mkShellNoCC {
+            shellHook = ''
+              ${config.pre-commit.installationScript}
+            '';
+          };
+
+          packages.default = pkgs.callPackage ./package.nix { };
         };
-      };
     };
 }