Add git-hooks

flake.nix

@@ -9,6 +9,11 @@
     stylix.url = "github:pizzapim/stylix/release-24.05";
     treefmt-nix.url = "github:numtide/treefmt-nix";
 
+    pre-commit-hooks = {
+      url = "github:cachix/git-hooks.nix";
+      inputs.nixpkgs.follows = "nixpkgs-unstable";
+    };
+
     nix-index-database = {
       url = "github:nix-community/nix-index-database";
       inputs.nixpkgs.follows = "nixpkgs";
@@ -91,5 +96,24 @@
           ];
         }
     ) (import ./machines);
+
+    checks = forAllSystems (system: {
+      pre-commit-check = inputs.pre-commit-hooks.lib.${system}.run {
+        src = ./.;
+        hooks = {
+          treefmt = {
+            enable = true;
+            package = treefmtEval.${system}.config.build.wrapper;
+          };
+        };
+      };
+    });
+
+    devShells = forAllSystems (system: {
+      default = nixpkgs.legacyPackages.${system}.mkShell {
+        inherit (self.checks.${system}.pre-commit-check) shellHook;
+        buildInputs = self.checks.${system}.pre-commit-check.enabledPackages;
+      };
+    });
   };
 }