digStairs.lua

function checkFuel(amount)
    if turtle.getFuelLevel() < amount*6 then
        return false
    else
        return true
    end
end
function Up()
 if not turtle.up() then
  turtle.digUp()
  Up()
 end
end
function Down()
 if not turtle.down() then
  turtle.digDown()
  Down()
 end
end
function Forward()
 if not turtle.forward() then
  turtle.dig()
  Forward()
 end
end
function stairDown(amount)
 for i=1,amount do
  Forward()
  Up()
  turtle.digUp()
  Down()
  Down()
 end
end
print("How many blocks Down:")
local amount = read()
if checkFuel(amount) then
    fuelStart = turtle.getFuelLevel()
    stairDown(amount)
    print("--------DONE----------")
    print(fuelStart - turtle.getFuelLevel() .." Fuel used")
else
    print("Not enoth Fuel," ..amount*6 .." required")
end