disable pesky game mode popup using nix on macos

mpv-no-game-mode.nix

{ pkgs, ... }:
let
  # disable game mode for mpv
  mpv-unwrapped = pkgs.mpv-unwrapped.overrideAttrs (attrs: {
    postPatch = (attrs.postPatch or "") + ''
      substituteInPlace TOOLS/osxbundle/mpv.app/Contents/Info.plist \
        --replace-fail 'public.app-category.games' 'public.app-category.video'
      '';
  });
  mpv-no-game-mode = pkgs.mpv.override {
    mpv = mpv-unwrapped;
  };
in {
  # use mpv-no-game-mode wherever you would be specifying packages, e.g.
  packages = with pkgs; [ 
    cowsay
    intercal
    mpv-no-game-mode
    sl
    toilet
  ];
}