checks: Add formatting, statix and deadnix checks

flake-parts/checks.nix

@@ -0,0 +1,20 @@
+{ inputs, self, ... }:
+{
+  perSystem =
+    { inputs', pkgs, ... }:
+    {
+      checks = {
+        formatting = (inputs.treefmt.lib.evalModule pkgs "${self}/treefmt.nix").config.build.check self;
+
+        statix = pkgs.runCommand "statix" { buildInputs = [ inputs'.statix.packages.statix ]; } ''
+          statix check ${self}
+          touch $out
+        '';
+
+        deadnix = pkgs.runCommand "deadnix" { buildInputs = [ pkgs.deadnix ]; } ''
+          deadnix --fail ${self}
+          touch $out
+        '';
+      };
+    };
+}

flake-parts/formatter.nix

@@ -1,16 +1,8 @@
-{ inputs, ... }:
+{ inputs, self, ... }:
 {
   perSystem =
     { pkgs, ... }:
     {
-      formatter =
+      formatter = (inputs.treefmt.lib.evalModule pkgs "${self}/treefmt.nix").config.build.wrapper;
-        (inputs.treefmt.lib.evalModule pkgs {
-          projectRootFile = "flake.nix";
-          programs = {
-            nixfmt.enable = true;
-            prettier.enable = true;
-            just.enable = true;
-          };
-        }).config.build.wrapper;
     };
 }

flake.lock

@@ -114,6 +114,27 @@
         "type": "github"
       }
     },
+    "flake-parts_2": {
+      "inputs": {
+        "nixpkgs-lib": [
+          "statix",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1754487366,
+        "narHash": "sha256-pHYj8gUBapuUzKV/kN/tR3Zvqc7o6gdFB9XKXIp1SQ8=",
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "rev": "af66ad14b28a127c5c0f3bbb298218fc63528a18",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "type": "github"
+      }
+    },
     "home-manager": {
       "inputs": {
         "nixpkgs": [
@@ -284,6 +305,7 @@
         "nixpkgs-unstable": "nixpkgs-unstable",
         "radicale-birthday-calendar": "radicale-birthday-calendar",
         "sops": "sops",
+        "statix": "statix",
         "treefmt": "treefmt",
         "vscode-extensions": "vscode-extensions"
       }
@@ -308,6 +330,44 @@
         "type": "github"
       }
     },
+    "statix": {
+      "inputs": {
+        "flake-parts": "flake-parts_2",
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1760596293,
+        "narHash": "sha256-duH6Il124g+CdYX+HCqOGnpJxyxOCgWYcrcK0CBnA2M=",
+        "owner": "oppiliappan",
+        "repo": "statix",
+        "rev": "e9df54ce918457f151d2e71993edeca1a7af0132",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oppiliappan",
+        "repo": "statix",
+        "type": "github"
+      }
+    },
+    "systems": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    },
     "treefmt": {
       "inputs": {
         "nixpkgs": [

flake.nix

@@ -35,6 +35,11 @@
       inputs.nixpkgs.follows = "nixpkgs";
     };
 
+    statix = {
+      url = "github:oppiliappan/statix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+
     vscode-extensions = {
       url = "github:nix-community/nix-vscode-extensions";
       inputs.nixpkgs.follows = "nixpkgs";

treefmt.nix

@@ -0,0 +1,8 @@
+{
+  projectRootFile = "flake.nix";
+  programs = {
+    nixfmt.enable = true;
+    prettier.enable = true;
+    just.enable = true;
+  };
+}