mine

local blocksMined = 0
local col = 0
local args = {...}
local colsToMine = args[1]
local length = args[2]

function checkFuel()
  turtle.select(16)
  if turtle.getItemCount(16) == 0 then
    print("Add coal to slot 16!")
    sleep(2)
  else
    turtle.refuel(1)
  end
end

function dig()
  while turtle.detect() do
    turtle.dig()
  end
  blocksMined = blocksMined + 1
end

function forward()
  while not turtle.forward() do
    checkFuel()
    dig()
  end
  checkFuel()
end

function turn()
  if col%2 > 0 then
    left()
    col = col + 1
  else
    right()
    col = col + 1
  end
end

function left()
  turtle.turnLeft()
  dig()
  forward()
  turtle.turnLeft()
end

function right()
  turtle.turnRight()
  dig()
  forward()
  turtle.turnRight()
end

function mineCol()
  for i=0, length do
    dig()
    forward()
  end
  turn()
end

for i=1, colsToMine do
  print("Mining column "..i)
  mineCol()
end