static S screenshotBot(S s) {
  new Matches m;
  
  if "screenshot"
    ret structure(ll("png", toPNG(shootScreen2())));
    
  if "screen size"
    ret structure(ll(screenWidth(), screenHeight()));
    
  if "screenshot xywh * * * *" {
    Rect r = new Rect(parseInt($1), parseInt($2), parseInt($3), parseInt($4));
    ret structure(ll("png", toPNG(shootScreen2(r))));
  }

  null;
}