flake: replace forAllSystems with eachSystem

flake.lock

@@ -93,7 +93,8 @@
     "root": {
       "inputs": {
         "alejandra": "alejandra",
-        "nixpkgs": "nixpkgs_2"
+        "nixpkgs": "nixpkgs_2",
+        "systems": "systems"
       }
     },
     "rust-analyzer-src": {
@@ -112,6 +113,21 @@
         "repo": "rust-analyzer",
         "type": "github"
       }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
     }
   },
   "root": "root",

flake.nix

@@ -14,10 +14,13 @@
     alejandra,
   }: let
     inherit (nixpkgs.lib) genAttrs;
-    forAllSystems = f:
-      genAttrs (import systems) (system: f nixpkgs.legacyPackages.${system});
+    eachSystem = fn:
+      genAttrs (import systems) (system: let
+        pkgs = import nixpkgs {localSystem.system = system;};
+      in
+        fn system pkgs);
   in {
-    packages = forAllSystems (pkgs:
+    packages = eachSystem (_: pkgs:
       with pkgs; {
         default = stdenv.mkDerivation {
           name = "monolisa-nerdfont-patch";
@@ -40,11 +43,11 @@
         };
       });
 
-    devShells = forAllSystems (pkgs:
+    devShells = eachSystem (_: pkgs:
       with pkgs; {
         default = mkShell {buildInputs = [fontforge python3 pre-commit];};
       });
 
-    formatter.x86_64-linux = alejandra.packages.x86_64-linux.default;
+    formatter = eachSystem (system: _: alejandra.packages.${system}.default);
   };
 }