如果有仓位，直接反手，怎么写代码

if time=closetime(0) and holding>0 then begin

   sell(1,0,market);

   buyshort(holding=0,1,market);

end

if time=closetime(0) and holding<) then begin

   sellshort(1,0,market);

   buy(holding=0,1,market);

end