Lumberjack v2

local tArgs = { ... }

--predefine
local lumberjack

function lumberjack()
    while not turtle.detect() do
        turtle.forward()
    end
    turtle.dig()
    print("Starting, turtle...")
    turtle.forward()
    while turtle.detectUp() do
        turtle.digUp()
        turtle.up()
    end
    while not turtle.detectUp() and not turtle.detectDown() do
        turtle.down()
    end
end

if tArgs[1] == "help"
    print( "Usage: lumberjack <distance>" )
elseif #tArgs < 1 then
    lumberjack()
else
    for i=1,tonumber(tArgs[1]) do
        lumberjack()
    end
end

print ("Complete, Turtle.")