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mods/futil/minetest/inventory.lua

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+function futil.get_location_string(inv)
+	local location = inv:get_location()
+	if location.type == "node" then
+		return ("nodemeta:%i,%i,%i"):format(location.pos.x, location.pos.y, location.pos.z)
+	elseif location.type == "player" then
+		return ("player:%s"):format(location.name)
+	elseif location.type == "detached" then
+		return ("detached:%s"):format(location.name)
+	else
+		error(("unexpected location? %s"):format(dump(location)))
+	end
+end
+
+-- InvRef:remove_item() ignores metadata, and sometimes that's wrong
+-- for logic, see InventoryList::removeItem in inventory.cpp
+function futil.remove_item_with_meta(inv, listname, itemstack)
+	itemstack = ItemStack(itemstack)
+	if itemstack:is_empty() then
+		return ItemStack()
+	end
+	local removed = ItemStack()
+	for i = 1, inv:get_size(listname) do
+		local invstack = inv:get_stack(listname, i)
+		if
+			invstack:get_name() == itemstack:get_name()
+			and invstack:get_wear() == itemstack:get_wear()
+			and invstack:get_meta() == itemstack:get_meta()
+		then
+			local still_to_remove = itemstack:get_count() - removed:get_count()
+			local leftover = removed:add_item(invstack:take_item(still_to_remove))
+			-- if we've requested to remove more than the stack size, ignore the limit
+			removed:set_count(removed:get_count() + leftover:get_count())
+			inv:set_stack(listname, i, invstack)
+			if removed:get_count() == itemstack:get_count() then
+				break
+			end
+		end
+	end
+	return removed
+end