mine

--prints true if inventory is full, else false
function isFull()
  for i=3, 16 do
    if turtle.getItemCount(i) == 0 then
      return false
    elseif i == 16 then
      return true
    end
  end
end

function emptyInventory()
  if isFull() == false then
    return
  end

  betterRefuel()

  turtle.select(2)
  turtle.placeDown()
  for i = 3, 16 do
    turtle.select(i)
    turtle.dropDown(64)
  end

  turtle.select(2)
  turtle.digDown()
end

--uses all fuel in inventory, up to 48 items
function betterRefuel()
  for i = 3, 16 do
    turtle.select(i)
    turtle.refuel(48)
  end
  turtle.select(2)
end

--moves forward but also digs
function betterMove()
  turtle.dig()
  turtle.forward()
  turtle.digUp()
  turtle.digDown()
  emptyInventory()
end

function farmLine(n)
  for i=1, n do
    betterMove()
  end
end

function right()
  turtle.turnRight()
  betterMove()
  turtle.turnRight()
end

function left()
  turtle.turnLeft()
  betterMove()
  turtle.turnLeft()
end

function placeLoaderUp()
  turtle.digUp()
  turtle.select(1)
  turtle.placeUp()
end

function placeLoader()
  turtle.dig()
  turtle.select(1)
  turtle.place()
end

function firstThreeLines()
  farmLine(15)
  placeLoaderUp()
  turtle.turnRight()
  farmLine(15)
  turtle.turnRight()
  farmLine(15)
end

function remainingLines()
  for i = 1, 14 do
    if i%2 == 1 then
      right()
    else
      left()
    end
  end
end

function reAlign()
  turtle.turnRight()
  betterMove()
  turtle.turnRight()
  for i=1, 15 do
    turtle.forward()
  end
end

function transition()
  turtle.turnRight()
  placeLoader()
  turtle.turnLeft()
  turtle.digUp()
  turtle.up()
  turtle.dig()
  placeLoader()
  turtle.down()
  turtle.forward()
  turtle.turnRight()
  betterMove()
  turtle.turnRight()
  turtle.dig()
  turtle.turnRight()
  turtle.forward()
  turtle.turnRight()
end

--firstThreeLines()
--remainingLines()
--reAlign()
--transition()
emptyInventory()