Use flake-utils in flake.nix

flake.lock

@@ -1,5 +1,23 @@
 {
   "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1776877367,
@@ -18,8 +36,24 @@
     },
     "root": {
       "inputs": {
+        "flake-utils": "flake-utils",
         "nixpkgs": "nixpkgs"
       }
+    },
+    "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

@@ -1,57 +1,43 @@
 {
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
   };
 
   outputs =
-    { self, nixpkgs }:
-    let
-      systems = [
-        "x86_64-linux"
-        "aarch64-linux"
-        "x86_64-darwin"
-        "aarch64-darwin"
-      ];
-      forEachSystem =
-        f: nixpkgs.lib.genAttrs systems (system: f system (import nixpkgs { inherit system; }));
-    in
     {
-      formatter = forEachSystem (_system: pkgs: pkgs.nixfmt-rfc-style);
+      self,
+      nixpkgs,
+      flake-utils,
+    }:
+    flake-utils.lib.eachDefaultSystem (
+      system:
+      let
+        pkgs = nixpkgs.legacyPackages.${system};
+      in
+      {
+        packages.default = pkgs.buildDotnetModule {
+          pname = "mutannot";
+          version = "0.1.0";
+          src = ./Mutannot;
+          projectFile = "Mutannot.fsproj";
+          nugetDeps = ./Mutannot/deps.nix;
+          executables = [ "mutannot" ];
+          dotnet-sdk = pkgs.dotnet-sdk_10;
+          dotnet-runtime = pkgs.dotnet-sdk_10;
+          useDotnetFromEnv = true;
 
-      packages = forEachSystem (
+          meta = {
-        _system: pkgs:
+            mainProgram = "mutannot";
-        let
-          mutannot = pkgs.buildDotnetModule {
-            pname = "mutannot";
-            version = "0.1.0";
-            src = ./Mutannot;
-            projectFile = "Mutannot.fsproj";
-            nugetDeps = ./Mutannot/deps.nix;
-            executables = [ "mutannot" ];
-            dotnet-sdk = pkgs.dotnet-sdk_10;
-            dotnet-runtime = pkgs.dotnet-sdk_10;
-            useDotnetFromEnv = true;
-
-            meta = {
-              mainProgram = "mutannot";
-            };
           };
-        in
+        };
-        {
-          default = mutannot;
-          mutannot = mutannot;
-        }
-      );
 
-      devShells = forEachSystem (
+        devShells.default = pkgs.mkShell {
-        _system: pkgs: {
+          packages = [
-          default = pkgs.mkShell {
+            pkgs.git
-            packages = [
+            pkgs.dotnet-sdk_10
-              pkgs.git
+          ];
-              pkgs.dotnet-sdk_10
+        };
-            ];
+      }
-          };
+    );
-        }
-      );
-    };
 }