chore: setup treefmt and pre-commit

.gitignore

@@ -1,2 +1,3 @@
 /target
 result
+.pre-commit-config.yaml

flake.lock

@@ -53,6 +53,22 @@
         "type": "github"
       }
     },
+    "flake-compat": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1696426674,
+        "narHash": "sha256-kvjfFW7WAETZlt09AgDn1MrtKzP7t90Vf7vypd3OL1U=",
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "rev": "0f9255e01c2351cc7d116c072cb317785dd33b33",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
     "flake-parts": {
       "inputs": {
         "nixpkgs-lib": [
@@ -73,6 +89,27 @@
         "type": "github"
       }
     },
+    "gitignore": {
+      "inputs": {
+        "nixpkgs": [
+          "pre-commit-hooks",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1709087332,
+        "narHash": "sha256-HG2cCnktfHsKV0s4XW83gU3F57gaTljL9KNSuG6bnQs=",
+        "owner": "hercules-ci",
+        "repo": "gitignore.nix",
+        "rev": "637db329424fd7e46cf4185293b9cc8c88c95394",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "gitignore.nix",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1725634671,
@@ -89,6 +126,45 @@
         "type": "github"
       }
     },
+    "nixpkgs-stable": {
+      "locked": {
+        "lastModified": 1720386169,
+        "narHash": "sha256-NGKVY4PjzwAa4upkGtAMz1npHGoRzWotlSnVlqI40mo=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "194846768975b7ad2c4988bdb82572c00222c0d7",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-24.05",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "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"
+      }
+    },
     "root": {
       "inputs": {
         "advisory-db": "advisory-db",
@@ -96,6 +172,7 @@
         "fenix": "fenix",
         "flake-parts": "flake-parts",
         "nixpkgs": "nixpkgs",
+        "pre-commit-hooks": "pre-commit-hooks",
         "systems": "systems",
         "treefmt-nix": "treefmt-nix"
       }

flake.nix

@@ -19,6 +19,11 @@
 
     treefmt-nix.url = "github:numtide/treefmt-nix";
     treefmt-nix.inputs.nixpkgs.follows = "nixpkgs";
+
+    pre-commit-hooks = {
+      url = "github:cachix/pre-commit-hooks.nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
   };
   outputs = {
     self,
@@ -28,11 +33,16 @@
   } @ inputs:
     flake-parts.lib.mkFlake {inherit self inputs;} {
       systems = import inputs.systems;
+      imports = [
+        inputs.pre-commit-hooks.flakeModule
+        inputs.treefmt-nix.flakeModule
+      ];
 
       perSystem = {
         pkgs,
         inputs',
         self',
+        config,
         ...
       }: let
         rustToolchain = inputs'.fenix.packages.fromToolchainFile {
@@ -74,8 +84,27 @@
 
         devShells.default = craneLib.devShell {
           inherit (self') checks;
+          inputsFrom = [config.pre-commit.devShell config.treefmt.build.devShell];
           packages = [];
         };
+
+        pre-commit = {
+          check.enable = false;
+          settings.hooks = {
+            alejandra.enable = true;
+            deadnix.enable = true;
+            rustfmt.enable = true;
+          };
+        };
+
+        treefmt.config = {
+          projectRootFile = "flake.nix";
+          programs = {
+            alejandra.enable = true;
+            deadnix.enable = true;
+            rustfmt.enable = true;
+          };
+        };
       };
     };