NetherTower

-- -------------------------------------------------------------------------- --
-- NetherTower : RRMkQrvf
--
-- Turtle script to build a 3x3 tower to the Nether ceiling -- beware of falling
-- lava!!!
--
-- -------------------------------------------------------------------------- --
--
-- INVENTORY:
-- [1][2][3][4]
-- [5][6][7][8]
-- [9][A][B][C]
-- [D][E][F][0]
--
-- 1 : Fuel
-- Rest should be tower material.
--
-- -------------------------------------------------------------------------- --

local tArgs = { ... }
local height = 0

local function PrintHelp()
  print( "Usage:" )
  print( "NetherTower <height>" )
  print( "  height -- starting height of turtle." )
  return
end

local function CheckFuel()
  if turtle.getFuelLevel() < 64 and turtle.getItemCount( 1 ) > 1 then
    turtle.select( 1 )
    turtle.refuel( 1 )
  end
  return
end

-- Check the commandline
if not #tArgs == 1 then
  PrintHelp()
  return
end

if tArgs[ 1 ] > "0" then
  height = tArgs[ 1 ]
else
  PrintHelp()
  return
end


-- Start with main shaft.
for step = height, 128 do
  while turtle.detectUp() do
    turtle.digUp()
  end
  CheckFuel()
  turtle.up()
  if not turtle.detect() then
    turtle.select( 2 )
    turtle.place()
  end
end
turtle.turnLeft()
if not turtle.detect() then
  turtle.select( 2 )
  turtle.place()
end
for step = height, 128 do
  turtle.down()
  if not turtle.detect() then
    turtle.select( 2 )
    turtle.place()
  end
end