Return to surface

local bot = {}

local function savePos()
  local handle = fs.open("enderMine/savedFile", "w")
  handle.write(textutils.serialize(bot))
  handle.close()
end

local function loadPos()
  local files = fs.list("/rom/enderMine")
  for i = 1, #files do
    print(files[i])
  end

  if fs.exists(filename) == true then
    local handle = fs.open("enderMine/savedFile", "r")
    readFile = handle.readLine()
    if readFile ~= nil then
      bot = textutils.unserialize(readFile)
    end
    handle.close()
  else
    print("file does not exist, check path..")
  end
end


local function printPos()
  term.clear()
  term.setCursorPos(1,1)
  print("------------")
  print("x"..bot.currX)
  print("z"..bot.currZ)
  print("y"..bot.currY)
  print("direction "..bot.direction)
  print("layer "..bot.currLayer)
  print("------------")
end


local function moveForward()
  while not turtle.forward() do
    turtle.dig()
  end
  savePos()
  printPos()
end

local function moveUp()
  while not turtle.up() do
    turtle.digUp()
  end
  bot.currY = bot.currY+1
  savePos()
  printPos()
end

local function moveDown()
  while not turtle.down() do
    turtle.digDown()
  end
  bot.currY = bot.currY-1
  savePos()
  printPos()
end

local function turnRight()
  turtle.turnRight()
  bot.direction = bot.direction +1
  if bot.direction > 4 then
    bot.direction = 1
  end
  savePos()
  printPos()
end

local function turnLeft()
  turtle.turnLeft()
  bot.direction = bot.direction -1
  if bot.direction < 1 then
    bot.direction = 4
  end
  savePos()
  printPos()
end


local function gotoShaft() -- finder punktet hvor den gik ned "skakten"
  while bot.direction ~= 3 do
   turnRight()
  end

  while bot.currX > 1 do
   moveForward()
   bot.currX = bot.currX -1
   savePos()
  end

  while bot.direction ~= 4 do
   turnRight()
  end

  while bot.currZ > 1 do
   moveForward()
   bot.currZ = bot.currZ -1
   savePos()
  end

  while bot.direction ~= 1 do
   turnRight()
  end
end

local function toSurface()
  while tonumber(bot.currY) < tonumber(bot.yStart) do
          moveUp()
  end
end

loadPos()
gotoShaft()
toSurface()