stairs

local tArgs = { ... }

if #tArgs ~= 2 then
        print( "Usage: stairs <depth>, <length>" )
        return
end

local depth = tonumber( tArgs[1] )
if depth < 1 then
        print( "stair depth must be positive" )
        return
end

local length = tonumber( tArgs[2] )
if length < 1 then
        print( "stair length must be positive" )
        return
end

local function digForward()
  while (turtle.detect()) do
    turtle.dig()
    sleep(0.2)
  end
end

local function digUp()
  while (turtle.detectUp()) do
    turtle.digUp()
    sleep(0.2)
  end
end

turtle.select(16)
local requiredFuel = (depth*2 / 80) + 1
if (requiredFuel < turtle.getFuelLevel()) then
  turtle.refuel()
end

local fuelLevel = turtle.getFuelLevel()
print("Fuel level: "..fuelLevel)
if fuelLevel < 1 then
 return
end

print("stairs "..depth.." x "..length)

local curDepth = 0
turtle.select(1)

while (curDepth < depth) do
  for i=1,length do
    digForward()
    turtle.forward()
    turtle.digDown()
    digUp()
    turtle.down()
    if (not turtle.detectDown()) then
      turtle.placeDown()
    else
      if (not turtle.compareDown()) then
        turtle.digDown()
        turtle.placeDown()
      end
    end

    curDepth = curDepth + 1
    if (curDepth == depth) then
      return
    end
  end
  turtle.turnRight()
end

turtle.turnRight()
turtle.turnRight()

curDepth = 0
while (curDepth < depth) do
  for i=1,length do
    turtle.up()
    turtle.forward()

    curDepth = curDepth + 1
    if (curDepth == depth) then
      return
    end
  end
  turtle.turnLeft()
end