chore(nix): add pre-commit checks

.pre-commit-config.yaml

@@ -0,0 +1 @@
+/nix/store/gnnangzf73g2b665rmhwblqydx18hjlm-pre-commit-config.json

flake.lock

@@ -44,6 +44,43 @@
         "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"
+      }
+    },
+    "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"
+      }
+    },
     "mkElmDerivation": {
       "inputs": {
         "elm-spa": "elm-spa",
@@ -51,11 +88,11 @@
         "nixpkgs": "nixpkgs"
       },
       "locked": {
-        "lastModified": 1737249952,
+        "lastModified": 1737854574,
-        "narHash": "sha256-bWOrcJUIW5q9BEmdeaE5XPnHiWuhujeFM23EweNMuO0=",
+        "narHash": "sha256-GIh8IAIjJ3BkqSKifdXcnrkJgY4diipcMZ1itmwiFyw=",
         "owner": "jeslie0",
         "repo": "mkElmDerivation",
-        "rev": "dd8538d8bcddcb7245cfdffffdf8118b0013dc64",
+        "rev": "88b3923af364826b39428aff3431857a2b9d8699",
         "type": "github"
       },
       "original": {
@@ -82,11 +119,11 @@
     },
     "nixpkgs_2": {
       "locked": {
-        "lastModified": 1737632463,
+        "lastModified": 1738142207,
-        "narHash": "sha256-38J9QfeGSej341ouwzqf77WIHAScihAKCt8PQJ+NH28=",
+        "narHash": "sha256-NGqpVVxNAHwIicXpgaVqJEJWeyqzoQJ9oc8lnK9+WC4=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "0aa475546ed21629c4f5bbf90e38c846a99ec9e9",
+        "rev": "9d3ae807ebd2981d593cddd0080856873139aa40",
         "type": "github"
       },
       "original": {
@@ -96,6 +133,22 @@
         "type": "github"
       }
     },
+    "nixpkgs_3": {
+      "locked": {
+        "lastModified": 1730768919,
+        "narHash": "sha256-8AKquNnnSaJRXZxc5YmF/WfmxiHX6MMZZasRP6RRQkE=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "a04d33c0c3f1a59a2c1cb0c6e34cd24500e5a1dc",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
     "npm-fix": {
       "inputs": {
         "nixpkgs": [
@@ -134,10 +187,31 @@
         "type": "github"
       }
     },
+    "pre-commit-hooks": {
+      "inputs": {
+        "flake-compat": "flake-compat",
+        "gitignore": "gitignore",
+        "nixpkgs": "nixpkgs_3"
+      },
+      "locked": {
+        "lastModified": 1737465171,
+        "narHash": "sha256-R10v2hoJRLq8jcL4syVFag7nIGE7m13qO48wRIukWNg=",
+        "owner": "cachix",
+        "repo": "pre-commit-hooks.nix",
+        "rev": "9364dc02281ce2d37a1f55b6e51f7c0f65a75f17",
+        "type": "github"
+      },
+      "original": {
+        "owner": "cachix",
+        "repo": "pre-commit-hooks.nix",
+        "type": "github"
+      }
+    },
     "root": {
       "inputs": {
         "mkElmDerivation": "mkElmDerivation",
         "nixpkgs": "nixpkgs_2",
+        "pre-commit-hooks": "pre-commit-hooks",
         "utils": "utils"
       }
     },

flake.nix

@@ -5,6 +5,7 @@
     nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
     utils.url = "github:numtide/flake-utils";
     mkElmDerivation.url = "github:jeslie0/mkElmDerivation";
+    pre-commit-hooks.url = "github:cachix/pre-commit-hooks.nix";
   };
 
   outputs =
@@ -13,6 +14,7 @@
       nixpkgs,
       utils,
       mkElmDerivation,
+      pre-commit-hooks,
     }:
     utils.lib.eachDefaultSystem (
       system:
@@ -26,10 +28,13 @@
         devShells.default =
           with pkgs;
           mkShell {
-            buildInputs = [
+            inherit (self.checks.${system}.pre-commit-check) shellHook;
+
+            buildInputs = self.checks.${system}.pre-commit-check.enabledPackages ++ [
               elmPackages.elm
               elmPackages.elm-test
               elmPackages.elm-format
+              elmPackages.elm-review
               entr
             ];
           };
@@ -50,6 +55,18 @@
           };
         };
 
+        checks = {
+          pre-commit-check = pre-commit-hooks.lib.${system}.run {
+            src = ./.;
+            hooks = {
+              nixfmt-rfc-style.enable = true;
+              elm-format.enable = true;
+              # elm-review.enable = true;
+              # elm-test.enable = true;
+            };
+          };
+        };
+
         formatter = nixpkgs.legacyPackages.${system}.nixfmt-rfc-style;
       }
     );