Turtle Stairs v1

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--                      Functions                              --
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function checkFuel() --Fuel checking, refuels if able, gives error if no fuel.
  result = true
  while turtle.getFuelLevel() < 1 do
   result = false
   for i=2,16 do
    turtle.select(i)
    if turtle.refuel(1) then
     result = true
     break
    end
   end
    if not result then
     print " "
     print "Please add a fuel to slot 16"
     print "Press Enter when done."
     x = read()
    end
  end
end

function forward() --Move and Dig Forward
 checkFuel()
  if turtle.detect() then
   turtle.dig()
  end
 turtle.forward()
end

function down() --Move and Dig Down
 checkFuel()
  if turtle.detectDown() then
   turtle.digDown()
  end
 turtle.down()
end

function place() --Place stairs
 checkFuel()
  result = true
   if not turtle.detectDown() then
    result = false
   for i=2,16 do
    turtle.select(i)
     if turtle.getItemCount(15) >3  then
      result = true
      break
     end
    end
   end
   if not result then
    print " "
    print "Please add stairs."
    print "Press Enter when done."
    x = read()
   end
     --Place Middle
     turtle.select(15)
     turtle.turnRight()
     turtle.turnRight()
     turtle.placeDown()
     --Place Right
     turtle.turnLeft()
     turtle.forward()
     turtle.turnRight()
     turtle.placeDown()
     --place Left
     turtle.turnRight()
     turtle.forward()
     turtle.forward()
     turtle.turnLeft()
     turtle.placeDown()
     --return mid
     turtle.turnLeft()
     turtle.forward()
     turtle.turnLeft()
end

function sides() --Clears Left and Right.
 turtle.turnLeft()
  if turtle.detect() then
   turtle.dig()
  end
 turtle.turnRight()
 turtle.turnRight()
  if turtle.detect() then
   turtle.dig()
  end
 turtle.turnLeft()
end

function Ret2strt() --Return to start
 checkFuel()
 turtle.up()
 turtle.back()
end

function firststeps()
 checkFuel()
 down()
 sides()
 turtle.up()
 place()
end

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--                      End Functions                          --
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print("How deep shall I go?")
ammount = read() --read() is a function which returns text you entered.
 firststeps()
for i=1, ammount do --Loop Start
print("Doing run ", i," of ", ammount)
 checkFuel()
 turtle.up()
 turtle.up()
 turtle.up()
 --Digging
 forward()
 sides()
 down()
 sides()
 down()
 sides()
 down()
 sides()
 down()
 sides()
 down()
 sides()
 turtle.up()
 place()
end
print "Turtle done!"
print "Going back."
for i=1, ammount do
  Ret2strt()
end
print "All Done."