Mining Program

write("size?\n")
size = read()
write("\nY-Position?\n")
yPos = read()
write("\nMax Y?\n")
maxY = read()
write("\nMin Y?\n")
minY = read()
write("\nHow many items to ignore?\n")
ignore_count = read()

function dropToChest()
   for i = ignore_count + 1, 16 do
     turtle.select(i)
     turtle.drop()
  end
end

function compareDown()
  for i = 1, ignore_count do
    turtle.select(i)
    if turtle.compareDown() then
      return false
    end
  end
  return true
end

function compareUp()
  for i = 1, ignore_count do
    turtle.select(i)
    if turtle.compareUp() then
      return false
    end
  end
  return true
end

function compare()
  if compareUp() then
    turtle.digUp()
  end
  if compareDown() then
    turtle.digDown()
  end
end

function dropIgnoreOverflow()
	for i = 1, ignore_count do
    if turtle.getItemCount(i) > 1 then
      turtle.select(i)
      turtle.drop(turtle.getItemCount(i)-1)
    end
  end
end

function mine()

  while not turtle.forward() do
    turtle.dig()
  end
  compare()
end

function mineLine()
  compare()
  for i = 2, size do
    mine()
  end
  dropIgnoreOverflow()
end

function mineLayer()
  for i = 1, size/2 do
    mineLine()
    turtle.turnRight()
    mine()
    turtle.turnRight()
    mineLine()

    if i < size/2 then
      turtle.turnLeft()
      mine()
      turtle.turnLeft()
    end
  end
  turtle.turnRight()
  mineLine()
  turtle.turnRight()
end

for iY = minY + 1, maxY-1, 3 do
  for i = yPos, iY, -1 do
    while not turtle.down() do
      turtle.digDown()
    end
  end
  mineLayer()
  for i = iY, yPos do
    while not turtle.up() do
      turtle.digUp()
    end
  end
  dropToChest()
end