Convert Iron to Dark Iron

--## Simple metal converter

--# Get Iron
function getIron()
  turtle.select(1)
  turtle.suckDown()
end

--# Check number of Iron Blocks
function getIronSize()
  return turtle.getItemCount(1)
end

--# Place Iron Block
function setIron()
  turtle.select(1)
  turtle.place()
end

--# Check not converted Iron
function checkIron()
  if turtle.getItemCount(3) > 0 then
    turtle.select(3)
    turtle.transferTo(1)
    doWork()
  end
end

--# Mine Dark Iron Block
function getDarkIron()
  turtle.select(2)
  turtle.dig()
end

--# Return Dark Iron
function setDarkIron()
  turtle.select(2)
  turtle.dropUp()
end

--# Place, mine, check
function doWork()
  getIron()
  metalSize = getIronSize()
  if metalSize > 0 then
    print(os.time() .. ": Got " .. metalSize .. " Iron Blocks")
    while metalSize > 0 do
      setIron()
      os.sleep(1)
      getDarkIron()
      metalSize =  metalSize - 1
    end
    checkIron()
    print(os.time() .. ": Converted!")
  end
  setDarkIron()
end

--# Main loop
while true do
  print(os.time() .. ": Checking inventory")
  doWork()
  os.sleep(5)
end