local robot = require("robot")
local computer = require("computer")
local sides = require("sides")
local component = require("component")
local ser = require("serialization")

local c = component.crafting
local inventory = component.inventory_controller



local left = robot.turnLeft
local right = robot.turnRight
local TURN = robot.turnAround
local d = robot.detect
local dUp = robot.detectUp
local dDown = robot.detectDown

local side = sides.front


local nRail_names = {}
nRail_names[1] = "minecraft:rail"
nRail_names[2] = "TConstruct:rail.wood"


local function getRail(stack_info)
  if stack_info == nil then
    return false
  end
  for index, known_rail_name in ipairs(nRail_names) do
    if stack_info.name == known_rail_name then
      return true
    end
  end
  return false
end

if robot.count(4) <=2 then
robot.select(14) ; robot.place() ; robot.select(4)
for slot=1,27 do
  local stack_info = inventory.getStackInSlot(side, slot)

  --- inspect the stack_info when it is not nil
  if getRail(stack_info) then
    print(stack_info.name, "found in slot", slot)
    inventory.suckFromSlot(sides.front, slot)
    break
  end
end
robot.select(5) ; inventory.dropIntoSlot(side, 1) ; robot.swing() ; robot.transferTo(14)
end

getRail(stack_info)