builder upgrade

sys/apis/chestProvider.lua

@@ -54,7 +54,9 @@ function ChestProvider:getItemInfo(id, dmg)
       item.max_size = stack.max_size
     end
   end
-  return item
+  if item.name then
+    return item
+  end
 end
  
 function ChestProvider:craft(id, dmg, qty)
@@ -79,7 +81,13 @@ function ChestProvider:provide(item, qty, slot)
     end
   end
 end
- 
+
+function ChestProvider:extract(slot, qty)
+  if self.p then
+    self.p.pushItem(self.direction, slot, qty)
+  end
+end
+
 function ChestProvider:insert(slot, qty)
   if self.p then
     local s, m = pcall(function() self.p.pullItem(self.direction, slot, qty) end)