Turtle Stair

-- Parameters
local length = 10
local width = 1
local stepHeight = 3
local direction = 1

-- Variables
local distance = 0

write("Enter Length: ")
length = tonumber(io.read()) or length
print("Length set to " .. length)
print("")

write("Enter Width: ")
width = tonumber(io.read()) or width
print("Width set to " .. width)
print("")

write("Enter Step Height: ")
stepHeight = tonumber(io.read()) or stepHeight
print("Step Height set to " .. stepHeight)
print("")

print("Enter Direction")
write("(0) left, (1) right: ")
local dir = tonumber(io.read()) or direction
local dirString = "none"
if (dir == 0 or dir == 1) then
  direction = dir
  if (dir == 0) then
    dirString = "Left"
  else
    dirString = "Right"
  end
end
print("Direction set to " .. dirString)
print("")

-- Functions
function Dig()
  while(turtle.detect()) do
    turtle.dig()
    sleep(0.5)
  end
end

function DigUp()
  while(turtle.detectUp()) do
    turtle.digUp()
    sleep(0.5)
  end
end

function DigDown()
  while(turtle.detectDown()) do
    turtle.digDown()
    sleep(0.5)
  end
end

function StepUp(move)
  DigUp()
  if (move) then
    turtle.up()
  end
end

function Step()
  Dig()
  turtle.forward()
  DigDown()
  for i = 1, stepHeight - 1 do
    if (i == stepHeight - 1) then
      StepUp(false)
    else
      StepUp(true)
    end
  end
  for i = 1, stepHeight do
    turtle.down()
  end
  distance = distance + 1
end

function StepBack()
  turtle.up()
  turtle.back()
end

function TurnStep()
  if (direction == 0) then
    turtle.turnLeft()
  else
    turtle.turnRight()
  end
  Dig()
  turtle.forward()
  if (direction == 0) then
    turtle.turnRight()
  else
    turtle.turnLeft()
  end
end

function NextLine()
  TurnStep()
end

-- Main
for w = 1, width do
  for l = 1, length do
    Step()
  end
  for l = 1, length do
    StepBack()
  end
  if (width == 1) then
    break
  else
    if (w == width) then
      break
    else
      NextLine()
    end
  end
end