nm

os.loadAPI("t")

local length = 25
local myPos = 0
local returnin = false

local args = {...}
print (#args)
if #args > 1 then length = args[1] end

function mineOne()
    t.df()
    t.f()
    t.dd()
    t.du()

    if returning then myPos = myPos -1
    else myPos = myPos + 1
    end
 print(myPos)
end

while (myPos < length) do
    mineOne()
end
print("end of line")
turtle.turnRight()
t.df()
t.f()
t.du()
t.dd()
turtle.turnRight()
returning = true
print("turn complete")
while (myPos > 0) do
    mineOne()
end
print ("returned home")