Auto Peripheral

function getDeviceSide(deviceType)
  deviceType = deviceType:lower()

  for i, side in pairs(rs.getSides()) do
    if (peripheral.isPresent(side)) then
      if (string.lower(peripheral.getType(side)) == deviceType) then
        return side;
       end
      end
     end

     return nil;
    end

function wrapThis(thing, f)
  local wrapped = nil
  while wrapped == nil and f <= 100 do
    wrapped = peripheral.wrap(thing.."_"..f)
    f = f + 1
   end

   if wrapped == nil then
   side = getDeviceSide(thing)
   if side ~= nil then
     return peripheral.wrap(side)
     else
     return nil
     end
    else
      return wrapped
    end
   end