Improve Nix derivation

.gitignore

@@ -1,2 +1,5 @@
+.direnv
 build/
 data.trace.db
+*.jar
+result

flake.lock

@@ -1,25 +1,58 @@
 {
   "nodes": {
-    "nixpkgs": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
       "locked": {
-        "lastModified": 1701952659,
-        "narHash": "sha256-TJv2srXt6fYPUjxgLAL0cy4nuf1OZD4KuA1TrCiQqg0=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "b4372c4924d9182034066c823df76d6eaf1f4ec4",
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
         "type": "github"
       },
       "original": {
-        "owner": "NixOS",
-        "ref": "nixos-23.11",
-        "repo": "nixpkgs",
+        "owner": "numtide",
+        "repo": "flake-utils",
         "type": "github"
       }
     },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1751943650,
+        "narHash": "sha256-7orTnNqkGGru8Je6Un6mq1T8YVVU/O5kyW4+f9C1mZQ=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "88983d4b665fb491861005137ce2b11a9f89f203",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "ref": "nixos-25.05",
+        "type": "indirect"
+      }
+    },
     "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

@@ -1,39 +1,23 @@
 {
-  description = "BASE Demo Game";
+  description = "The BASE engine demo game";
 
   inputs = {
-    nixpkgs.url = github:NixOS/nixpkgs/nixos-23.11;
+    nixpkgs.url = "nixpkgs/nixos-25.05";
+    flake-utils.url = "github:numtide/flake-utils";
   };
 
-  outputs = { self, nixpkgs }:
-  let
-    pkgs = import nixpkgs { inherit system; };
-    system = "x86_64-linux";
-    opengl = "/run/opengl-driver";
+  outputs = inputs @ {
+    self,
+    nixpkgs,
+    flake-utils,
+    ...
+  }:
+    flake-utils.lib.eachDefaultSystem (system: let
+      pkgs = import nixpkgs {inherit system;};
     in {
-    devShells.${system}.default = with pkgs; mkShell {
-      name = "base-demo";
-
-      buildInputs = [
-        xorg.libXtst
-        alsa-lib
-        jdk17
-      ];
-
-      shellHook = ''
-        echo
-        echo
-        echo "======================================================================================================"
-        echo "Welcome to BASE Demo Game NixOS flake shell environment"
-        echo "Remember to provide following LD environment variable in order to run the game outside this shell"
-        echo
-        echo "LD_LIBRARY_PATH=$LD_LIBRARY_PATH"
-        echo "======================================================================================================"
-        echo
-        echo
-      '';
-
-      LD_LIBRARY_PATH = "${opengl}/lib:${xorg.libXtst}/lib:${alsa-lib}/lib";
-    };
+      packages = rec {
+        game = pkgs.callPackage ./game.nix (inputs // {inherit system;});
+        default = game;
       };
+    });
 }

game.nix

@@ -0,0 +1,41 @@
+{
+  pkgs,
+  lib,
+  stdenv,
+  system,
+  makeWrapper,
+  jdk17,
+  xorg,
+  openjfx17,
+  glib,
+  alsa-lib,
+  libGL,
+  gtk3,
+  ...
+}:
+stdenv.mkDerivation rec {
+  pname = "base-demo";
+  version = "0.0.1";
+
+  src = pkgs.requireFile {
+    name = "${pname}-jar-${version}.jar";
+    sha256 = "0k0zh3zccz1sgdqgc97glb6i2rb2459lp89j9s6hyvlzpk86sy5z";
+    message = "Please compile the game with BASE game designer, then rename the output 'game.jar' file to '${pname}-jar-${version}.jar' and add it to store before proceeding.";
+  };
+
+  dontUnpack = true;
+
+  nativeBuildInputs = [makeWrapper];
+
+  installPhase = ''
+    mkdir -p $out/bin
+    makeWrapper "${jdk17}/bin/java" $out/bin/base-demo \
+      --add-flags "-jar ${src}" \
+      --prefix LD_LIBRARY_PATH : "${xorg.libXtst}/lib" \
+      --prefix LD_LIBRARY_PATH : "${openjfx17}/lib" \
+      --prefix LD_LIBRARY_PATH : "${glib.out}/lib" \
+      --prefix LD_LIBRARY_PATH : "${alsa-lib}/lib" \
+      --prefix LD_LIBRARY_PATH : "${libGL}/lib" \
+      --prefix LD_LIBRARY_PATH : "${gtk3}/lib"
+  '';
+}