flake: setup nix-formatter-pack

.github/workflows/lints.yml

@@ -3,7 +3,7 @@ on:
   pull_request:
   push:
 jobs:
-  cachix:
+  lint:
     runs-on: ubuntu-latest
 
     steps:
@@ -13,8 +13,5 @@ jobs:
       - name: Install nix
         uses: cachix/install-nix-action@v18
 
-      - name: Run formatter
+      - name: Run nix-formatter-pack-check
-        run: nix fmt -- --check .
+        run: nix build .#checks.x86_64-linux.nix-formatter-pack-check
-
-      - name: Run statix
-        run: nix run nixpkgs#statix -- check

flake.lock

@@ -21,6 +21,28 @@
         "type": "github"
       }
     },
+    "nix-formatter-pack": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "nmd": "nmd",
+        "nmt": "nmt"
+      },
+      "locked": {
+        "lastModified": 1666720474,
+        "narHash": "sha256-iWojjDS1D19zpeZXbBdjWb9MiKmVVFQCqtJmtTXgPx8=",
+        "owner": "Gerschtli",
+        "repo": "nix-formatter-pack",
+        "rev": "14876cc8fe94a3d329964ecb073b4c988c7b61f5",
+        "type": "github"
+      },
+      "original": {
+        "owner": "Gerschtli",
+        "repo": "nix-formatter-pack",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1664019863,
@@ -52,9 +74,42 @@
         "type": "github"
       }
     },
+    "nmd": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1666190571,
+        "narHash": "sha256-Z1hc7M9X6L+H83o9vOprijpzhTfOBjd0KmUTnpHAVjA=",
+        "owner": "rycee",
+        "repo": "nmd",
+        "rev": "b75d312b4f33bd3294cd8ae5c2ca8c6da2afc169",
+        "type": "gitlab"
+      },
+      "original": {
+        "owner": "rycee",
+        "repo": "nmd",
+        "type": "gitlab"
+      }
+    },
+    "nmt": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1648075362,
+        "narHash": "sha256-u36WgzoA84dMVsGXzml4wZ5ckGgfnvS0ryzo/3zn/Pc=",
+        "owner": "rycee",
+        "repo": "nmt",
+        "rev": "d83601002c99b78c89ea80e5e6ba21addcfe12ae",
+        "type": "gitlab"
+      },
+      "original": {
+        "owner": "rycee",
+        "repo": "nmt",
+        "type": "gitlab"
+      }
+    },
     "root": {
       "inputs": {
         "home-manager": "home-manager",
+        "nix-formatter-pack": "nix-formatter-pack",
         "nixpkgs": "nixpkgs",
         "nixpkgs-for-bootstrap": "nixpkgs-for-bootstrap"
       }

flake.nix

@@ -13,9 +13,14 @@
       url = "github:nix-community/home-manager";
       inputs.nixpkgs.follows = "nixpkgs";
     };
+
+    nix-formatter-pack = {
+      url = "github:Gerschtli/nix-formatter-pack";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
   };
 
-  outputs = { self, nixpkgs, nixpkgs-for-bootstrap, home-manager }:
+  outputs = { self, nixpkgs, nixpkgs-for-bootstrap, home-manager, nix-formatter-pack }:
     let
       forEachSystem = nixpkgs.lib.genAttrs [ "aarch64-linux" "x86_64-linux" ];
 
@@ -30,6 +35,20 @@
         type = "app";
         program = "${pkgs'.callPackage ./nix-on-droid { }}/bin/nix-on-droid";
       };
+
+      formatterPackArgsFor = forEachSystem (system: {
+        inherit nixpkgs system;
+        checkFiles = [ ./. ];
+
+        config.tools = {
+          deadnix = {
+            enable = true;
+            noLambdaPatternNames = true;
+          };
+          nixpkgs-fmt.enable = true;
+          statix.enable = true;
+        };
+      });
     in
     {
       apps.aarch64-linux = {
@@ -37,7 +56,11 @@
         nix-on-droid = app;
       };
 
-      formatter = forEachSystem (system: nixpkgs.legacyPackages.${system}.nixpkgs-fmt);
+      checks = forEachSystem (system: {
+        nix-formatter-pack-check = nix-formatter-pack.lib.mkCheck formatterPackArgsFor.${system};
+      });
+
+      formatter = forEachSystem (system: nix-formatter-pack.lib.mkFormatter formatterPackArgsFor.${system});
 
       lib.nixOnDroidConfiguration =
         { config