Flake: Use flake-utils instead of a self-written solution

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": 1771369470,
@@ -18,8 +36,8 @@
     },
     "root": {
       "inputs": {
-        "nixpkgs": "nixpkgs",
-        "systems": "systems"
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
       }
     },
     "systems": {
@@ -32,8 +50,9 @@
         "type": "github"
       },
       "original": {
-        "id": "systems",
-        "type": "indirect"
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
       }
     }
   },

flake.nix

@@ -1,45 +1,33 @@
 {
-  inputs.nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+    inputs = {
+	nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+	flake-utils.url = "github:numtide/flake-utils";
+    };
 
     outputs =
-    inputs @ { nixpkgs
-    , systems
-    , ...
-    }:
-    let
-      inherit (nixpkgs) lib;
-      eachSystem = lib.genAttrs (import systems);
-      pkgsFor = eachSystem (system:
-        import nixpkgs {
-          localSystem = system;
-        });
-    in
 	{ 
-      devShells =
-        eachSystem
-          (system: {
-            default =
+	nixpkgs,
+	flake-utils,
+	...
+	}: flake-utils.lib.eachDefaultSystem(system: 
 	    let
-                pkgs = pkgsFor.${system};
+		pkgs = import nixpkgs { inherit system; };
 		pico-sdk = pkgs.pico-sdk.override {
 		    withSubmodules = true;
 		};
 		PICO_SDK_PATH = "${pico-sdk}/lib/pico-sdk";
-              in
-              pkgs.mkShell {
+	    in {
+		devShell = pkgs.mkShell {
 		    name = "PicoVGA dev shell";
 		    inputsFrom = [ pico-sdk ];
-                packages = with pkgs;
-                  [
+		    packages = with pkgs; [
 			gcc-arm-embedded
 			python3
 
 			usbutils
 			picotool
-                    picocom
-                  ]
-                  ++ [ pico-sdk ];
-
+			pico-sdk
+		    ];
 		    shellHook = ''
 		    ln -sf ${PICO_SDK_PATH}/external/pico_sdk_import.cmake pico_sdk_import.cmake
 		    '';
@@ -47,5 +35,4 @@
 		    inherit PICO_SDK_PATH;
 		};
 	    });
-    };
 }