Make empty buckets stackable

mods/bucket/init.lua

@@ -105,7 +105,7 @@ end
 minetest.register_craftitem("bucket:bucket_empty", {
     description = "Empty Bucket",
     inventory_image = "bucket.png",
-	stack_max = 1,
+    stack_max = 99,
     liquids_pointable = true,
     on_use = function(itemstack, user, pointed_thing)
         -- Must be pointing to node
@@ -115,17 +115,41 @@ minetest.register_craftitem("bucket:bucket_empty", {
         -- Check if pointing to a liquid source
         local node = minetest.get_node(pointed_thing.under)
         local liquiddef = bucket.liquids[node.name]
-		if liquiddef ~= nil and liquiddef.itemname ~= nil and
+        local item_count = user:get_wielded_item():get_count()
-				node.name == liquiddef.source then
+
+        if liquiddef ~= nil
+        and liquiddef.itemname ~= nil
+        and node.name == liquiddef.source then
             if check_protection(pointed_thing.under,
                     user:get_player_name(),
                     "take ".. node.name) then
                 return
             end
 
+            -- default set to return filled bucket
+            local giving_back = liquiddef.itemname
+
+            -- check if holding more than 1 empty bucket
+            if item_count > 1 then
+
+                -- if space in inventory add filled bucked, otherwise drop as item
+                local inv = user:get_inventory()
+                if inv:room_for_item("main", {name=liquiddef.itemname}) then
+                    inv:add_item("main", liquiddef.itemname)
+                else
+                    local pos = user:getpos()
+                    pos.y = math.floor(pos.y + 0.5)
+                    core.add_item(pos, liquiddef.itemname)
+                end
+
+                -- set to return empty buckets minus 1
+                giving_back = "bucket:bucket_empty "..tostring(item_count-1)
+
+            end
+
             minetest.add_node(pointed_thing.under, {name="air"})
 
-			return ItemStack(liquiddef.itemname)
+            return ItemStack(giving_back)
         end
     end,
 })