Milker

local cSleepTime=1
local data1, data2


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-- basic functions for turtle control -
---------------------------------------
local function gf()  while not turtle.forward()   do end end
local function gb()  while not turtle.back()      do end end
local function gu()  while not turtle.up()        do end end
local function gd()  while not turtle.down()      do end end
local function gl()  while not turtle.turnLeft()  do end end
local function gr()  while not turtle.turnRight() do end end
local function df()  turtle.dig()       end
local function du()  turtle.digUp()     end
local function dd()  turtle.digDown()   end
local function pf()  turtle.place()     end
local function pu()  turtle.placeUp()   end
local function pd()  turtle.placeDown() end
local function sf()  return turtle.suck()      end
local function su()  return turtle.suckUp()    end
local function sd()  return turtle.suckDown()  end
local function Df(n) return turtle.drop(n)     end
local function Du()  return turtle.dropUp()    end
local function Dd()  return turtle.dropDown()  end
local function ss(s) turtle.select(s) slotSelected=s  end

---------------------------------------
-- Main
---------------------------------------
while true do
  ss(1)
  data1 = turtle.getItemDetail()
  print("  slot 1: "..data1.name)
  waitCounter=0
  while true do
    pu()
    data2 = turtle.getItemDetail()
    print("  slot 1: "..data2.name)
    if data1.name~=data2.name then
      -- the bucket should be filled now
      break
    else
      waitCounter=waitCounter+1
      print("No milk today, my love has gone away... I'll retry it after "..(cSleepTime+1)*waitCounter.." seconds.")
      sleep((cSleepTime+1)*waitCounter)
      if waitCounter > 30 then
        print("Error: I retried milking the cow 30 times and had no luck! Please, check set-up (cow,yogurt,bucket...).")
        return
      end
    end
  end
  print("  crafting fresh milk")
  turtle.craft()  -- state 3: 1,4
  ss(2)
  waitCounter=0
  while true do
      if Dd() then
          break
      else
        waitCounter=waitCounter+1
        print("Waiting for inventory space... Waiting for ".. (cSleepTime+1)*waitCounter .. " seconds.")
        sleep((cSleepTime+1)*waitCounter)
      end
  end
  sleep(1)

end