PrismLauncher/flake.nix

{
  description = "A custom launcher for Minecraft that allows you to easily manage multiple installations of Minecraft at once (Fork of MultiMC)";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
    flake-compat = {
      url = "github:edolstra/flake-compat";
      flake = false;
    };
    libnbtplusplus = {
      url = "github:PrismLauncher/libnbtplusplus";
      flake = false;
    };
  };

  outputs = {
    self,
    nixpkgs,
    libnbtplusplus,
    ...
  }: let
    # User-friendly version number.
    version = builtins.substring 0 8 self.lastModifiedDate;

    # Supported systems (qtbase is currently broken for "aarch64-darwin")
    supportedSystems = ["x86_64-linux" "x86_64-darwin" "aarch64-linux"];

    # Helper function to generate an attrset '{ x86_64-linux = f "x86_64-linux"; ... }'.
    forAllSystems = nixpkgs.lib.genAttrs supportedSystems;

    # Nixpkgs instantiated for supported systems.
    pkgs = forAllSystems (system: nixpkgs.legacyPackages.${system});

    packagesFn = pkgs: rec {
      prismlauncher-qt5 = pkgs.libsForQt5.callPackage ./nix {inherit version self libnbtplusplus;};
      prismlauncher = pkgs.qt6Packages.callPackage ./nix {inherit version self libnbtplusplus;};
    };
  in {
    packages = forAllSystems (
      system: let
        packages = packagesFn pkgs.${system};
      in
        packages // {default = packages.prismlauncher;}
    );

    overlay = final: packagesFn;
  };
}