import/export

local component = require('component')
local transposer = component.transposer
local interface = component.block_refinedstorage_interface

local function toBuffer(item, size)
  local items, current = interface.getItems()
  for i = 1, #items do
    if items[i].name..':'..items[i].damage == item then
      current = i
      break
    end
  end
  if not current then
    return nil
  end
  local counter, c_size, moved = 0, size
  for i = 1, math.ceil(size/64) do
    moved = interface.extractItem(items[current], c_size, 1)
    if not moved then
      return counter
    end
    counter, c_size = counter + moved, c_size - moved
  end
  return counter
end

local function toStorage(item, size)
  local counter = 0
  for i = 1, transposer.getInventorySize(1) do
    local fitem = transposer.getStackInSlot(1, i)
    if fitem then
      if item == fitem.name..':'..fitem.damage then
        if fitem.size < size then
          transposer.transferItem(1, 0, fitem.size)
          size, counter = size - fitem.size, counter+fitem.size
        elseif fitem.size >= size then
          transposer.transferItem(1, 0, size)
          size, counter = 0, counter+size
          break
        end
      end
    end
  end
  return counter
end

print(toBuffer('minecraft:stone:0', 300))
print(toStorage('minecraft:stone:0', 300))