Make empty buckets stackable

mods/bucket/init.lua

@@ -103,31 +103,55 @@ function bucket.register_liquid(source, flowing, itemname, inventory_image, name
 end
 
 minetest.register_craftitem("bucket:bucket_empty", {
-	description = "Empty Bucket",
-	inventory_image = "bucket.png",
-	stack_max = 1,
-	liquids_pointable = true,
-	on_use = function(itemstack, user, pointed_thing)
-		-- Must be pointing to node
-		if pointed_thing.type ~= "node" then
-			return
-		end
-		-- 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
-				node.name == liquiddef.source then
-			if check_protection(pointed_thing.under,
-					user:get_player_name(),
-					"take ".. node.name) then
-				return
-			end
+    description = "Empty Bucket",
+    inventory_image = "bucket.png",
+    stack_max = 99,
+    liquids_pointable = true,
+    on_use = function(itemstack, user, pointed_thing)
+        -- Must be pointing to node
+        if pointed_thing.type ~= "node" then
+            return
+        end
+        -- Check if pointing to a liquid source
+        local node = minetest.get_node(pointed_thing.under)
+        local liquiddef = bucket.liquids[node.name]
+        local item_count = user:get_wielded_item():get_count()
 
-			minetest.add_node(pointed_thing.under, {name="air"})
+        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
 
-			return ItemStack(liquiddef.itemname)
-		end
-	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(giving_back)
+        end
+    end,
 })
 
 bucket.register_liquid(