flake: add treefmt

flake.lock

@@ -626,6 +626,22 @@
       }
     },
     "nixpkgs_6": {
+      "locked": {
+        "lastModified": 1735554305,
+        "narHash": "sha256-zExSA1i/b+1NMRhGGLtNfFGXgLtgo+dcuzHzaWA6w3Q=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "0e82ab234249d8eee3e8c91437802b32c74bb3fd",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs_7": {
       "locked": {
         "lastModified": 1719010183,
         "narHash": "sha256-8HMWaqpyjbVeEsmy/A2H6VFtW/Wr71vkPLnpTiAXu+8=",
@@ -641,7 +657,7 @@
         "type": "github"
       }
     },
-    "nixpkgs_7": {
+    "nixpkgs_8": {
       "locked": {
         "lastModified": 1714091391,
         "narHash": "sha256-68n3GBvlm1MIeJXadPzQ3v8Y9sIW3zmv8gI5w5sliC8=",
@@ -708,6 +724,7 @@
         "ranger-icons": "ranger-icons",
         "tlauncher": "tlauncher",
         "tomater": "tomater",
+        "treefmt-nix": "treefmt-nix",
         "vpsadminos": "vpsadminos",
         "warthunder-leak-counter": "warthunder-leak-counter",
         "wl-crosshair": "wl-crosshair",
@@ -900,6 +917,24 @@
         "url": "https://git.lelgenio.com/lelgenio/tomater"
       }
     },
+    "treefmt-nix": {
+      "inputs": {
+        "nixpkgs": "nixpkgs_6"
+      },
+      "locked": {
+        "lastModified": 1737483750,
+        "narHash": "sha256-5An1wq5U8sNycOBBg3nsDDgpwBmR9liOpDGlhliA6Xo=",
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "rev": "f2cc121df15418d028a59c9737d38e3a90fbaf8f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "type": "github"
+      }
+    },
     "vpsadminos": {
       "locked": {
         "lastModified": 1737136524,
@@ -919,7 +954,7 @@
       "inputs": {
         "crane": "crane_3",
         "flake-utils": "flake-utils_6",
-        "nixpkgs": "nixpkgs_6"
+        "nixpkgs": "nixpkgs_7"
       },
       "locked": {
         "lastModified": 1719076817,
@@ -938,7 +973,7 @@
     "wl-crosshair": {
       "inputs": {
         "flake-utils": "flake-utils_7",
-        "nixpkgs": "nixpkgs_7"
+        "nixpkgs": "nixpkgs_8"
       },
       "locked": {
         "lastModified": 1715216838,

flake.nix

@@ -43,6 +43,8 @@
       inputs.nixpkgs.follows = "nixpkgs";
     };
 
+    treefmt-nix.url = "github:numtide/treefmt-nix";
+
     # my stuff
     dhist.url = "github:lelgenio/dhist";
     demoji.url = "github:lelgenio/demoji";
@@ -176,6 +178,7 @@
 
       packages.${system} = pkgs // packages;
 
-      formatter.${system} = pkgs.nixfmt-rfc-style;
+      # formatter.${system} = pkgs.nixfmt-rfc-style;
+      formatter.${system} = (inputs.treefmt-nix.lib.evalModule pkgs ./treefmt.nix).config.build.wrapper;
     };
 }

treefmt.nix

@@ -0,0 +1,8 @@
+{ pkgs, ... }:
+{
+  projectRootFile = "flake.nix";
+  programs.nixfmt.enable = true;
+  programs.nixfmt.package = pkgs.nixfmt-rfc-style;
+
+  settings.on-unmatched = "debug";
+}