Minecraft Turtle: Room

--[[
    2013 (c) psychedelixx
    Minecraft Turtle: Room
    2013-05-22

    Digs a room with specified dimensions.

    Usage:
        - use turtle and type "label set <name>"
          (to give your turtle an unique name so it remembers its programs)
        - type "pastebin get tPQVZfmw room"
        - type "room <width> [<length>] [<height>]"
    - default length = width
    - default height = 2
    - place solid blocks in slot 16 to fill the ground
--]]

function move()
    if turtle.getFuelLevel() < 2 then
        turtle.refuel()
    end
    if fillGround and not turtle.detectDown() then
        turtle.select(16)
        turtle.placeDown()
    end

    while not turtle.forward() do
        turtle.dig()
    end
    repeat
        turtle.digUp()
    until not turtle.detectUp()
end

local args = { ... }
if #args < 1 then
    print("")
    print("Usage: room <width> [<length>] [<height>]")
    print("# default length = width")
    print("# default height = 2")
    print("# place solid blocks in slot 16 to fill the ground")
    print("")

    error()
end

width = tonumber(args[1])
length = width
height = 2
fillGround = true

if #args >= 2 then
    length = tonumber(args[2])
end
if #args == 3 then
    height = tonumber(args[3])
end

if height*width*length < 1 then
  print( "A room must be at least 1m^3." )
  error()
end

if turtle.getFuelLevel() == 0 then
    turtle.refuel()
end

if turtle.getFuelLevel() == 0 then
    print("I need fuel!")
else
    print("======== 2013 (c) psychedelixx ========")
    print("Let's go!")
    print("Digging " .. width .. "*" .. length .. "*" .. height .. " (w*l*h)")
    move()

    nextTurnRight = true
    h = 0

    repeat
        w = 1
        while w <= width do
            print("")
                if turtle.getFuelLevel() ~= "unlimited" then
                print("Fuel: " .. turtle.getFuelLevel())
            end
            for l = 1, length-1 do
                move()
            end
            if w < width then
                if nextTurnRight then
                    turtle.turnRight()
                    move()
                    turtle.turnRight()
                    nextTurnRight = false
                else
                    turtle.turnLeft()
                    move()
                    turtle.turnLeft()
                    nextTurnRight = true
                end
            end
            w = w+1
        end
        if h < height-1 then
            h = h+2
        else
            if h == height-1 then
                h = h+1
            end
        end

        if h < height then
            turtle.turnRight()
            turtle.turnRight()
            turtle.up()
            turtle.digUp()
            if h < height-1 then
                turtle.up()
                turtle.digUp()
            end
        end
        fillGround = false
    until h >= height

    while h > 2 do
        turtle.down()
        h = h-1
    end


end