feat: prepare for treefmt-nix

.vscode/settings.json

@@ -11,7 +11,7 @@
             },
             "formatting": {
                 "command": [
-                    "alejandra",
+                    "treefmt-nix",
                 ]
             }
         }

flake.lock

@@ -1080,6 +1080,7 @@
         "rperf": "rperf",
         "sops-nix": "sops-nix",
         "srvos": "srvos",
+        "treefmt-nix": "treefmt-nix_4",
         "x13s-bt-firmware": "x13s-bt-firmware",
         "yofi": "yofi"
       }
@@ -1316,6 +1317,26 @@
         "type": "github"
       }
     },
+    "treefmt-nix_4": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1730321837,
+        "narHash": "sha256-vK+a09qq19QNu2MlLcvN4qcRctJbqWkX7ahgPZ/+maI=",
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "rev": "746901bb8dba96d154b66492a29f5db0693dbfcc",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "type": "github"
+      }
+    },
     "x13s-bt-firmware": {
       "flake": false,
       "locked": {

flake.nix

@@ -125,6 +125,10 @@
       url = "github:nix-community/nixvim/nixos-24.05";
       inputs.nixpkgs.follows = "nixpkgs";
     };
+    treefmt-nix = {
+      url = "github:numtide/treefmt-nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
   };
 
   outputs = inputs @ {
@@ -325,7 +329,7 @@
           '';
         };
 
-        formatter = pkgs.alejandra;
+        formatter = inputs.treefmt-nix.formatter.${system};
 
         devShells = let
           all = import ./nix/devShells.nix {

nix/devShells.nix

@@ -24,6 +24,7 @@ in {
       self'.devShells.install
     ];
     packages = with pkgs; [
+      self'.formatter
       inputs'.colmena.packages.colmena
       dconf2nix
       inputs'.nixos-anywhere.packages.nixos-anywhere