Enclosed Staircase Builder

function clear()
 term.clear()
 term.setCursorPos(1,1)
end

function nofuel()
 clear()
 for i=1,x-1 do
  write("-")
 end
 print("Please insert some fuel first!")
 print("Make sure to put in enough for the task.")
 print("")
 print("Returning...")
 for i=1,x-1 do
  write("-")
 end
 sleep(1)
 start()
end

function checkfuel()
 if turtle.getFuelLevel() < 5 then
  return true
 else
  return false
 end
end

function refuel(quantity)
 fuelpre = turtle.getFuelLevel()
 for i4=0,13 do
  turtle.select(16-i4)
  if turtle.refuel(quantity) then
   break
  else
   if 16-i4==3 then
    fuelpost = turtle.getFuelLevel()
    turtle.select(1)
    if fuelpre == fuelpost then
     nofuel()
    end
   end
  end
 end
 turtle.select(tmp)
end

function findcobble()
 for i1 = 3,16 do
  turtle.select(i1)
  if turtle.compareTo(1) then
   tmp = i1
   break
  end
 end
end

function findstairs()
 for i3 = 3,16 do
  turtle.select(i3)
  if turtle.compareTo(2) then
   tmp = i3
   break
  end
 end
end

function dig()
 turtle.select(1)
 if not turtle.compare() then
  turtle.dig()
 end
 turtle.digUp()
 turtle.select(tmp)
end

function buildwallsegment()
 findcobble()
 for i2 = 1,3 do
  output()
  if checkfuel() then
   refuel(1)
  end
  dig()
  turtle.place()
  turtle.turnRight()
  dig()
  if i2 < 3 then
   turtle.forward()
   turtle.turnLeft()
  end
 end
end

function buildfullsegment()
 for i5 = 1,4 do
  buildwallsegment()
 end
end

function placestairs()
 if checkfuel() then
  refuel(1)
 end
 findcobble()
 turtle.forward()
 output()
 turtle.place()
 findstairs()
 turtle.back()
 output()
 turtle.place()
 turtle.up()
 output()
 turtle.forward()
 output()
 turtle.place()
 turtle.up()
 output()
 turtle.forward()
 output()
end

function staircase()
 buildfullsegment()
 turtle.up()
 output()
 buildfullsegment()
 turtle.down()
 output()
 turtle.turnRight()
 placestairs()
end

function confirm()
 clear()
 x,y=term.getSize()
 for i=1,x-1 do
  write("-")
 end
 print("Stairs v0.1a by m3Zz")
 print("")
 print("Alright, building a "..(height*2).." blocks high staircase!")
 for i=1,x-1 do
  write("-")
 end
 sleep(1)
end

function getinfo()
 clear()
 x,y=term.getSize()
 for i=1,x-1 do
  write("-")
 end
 print("Stairs v0.1a by m3Zz")
 print("")
 print("How high shall the staircase be?")
 for i=1,x-1 do
  write("-")
 end
 print("")
 height=read()
 confirm()
end

function output()
 clear()
 x,y=term.getSize()
 for i=1,x-1 do
  write("-")
 end
 print("Stairs v0.1a by m3Zz")
 print("")
 print("Fuel Level: "..turtle.getFuelLevel())
 print("Building...")
 for i=1,x-1 do
  write("-")
 end
end

function setup()
 clear()
 getinfo()
end

function main()
 clear()
 output()
 for i = 1,height do
  staircase()
 end
 start()
end

function start()
 setup()
 main()
end

start()