flat

arg = {...}

length = arg[1]
width = arg[2]
dir = arg[3]
cSlot = 1
slots = 16
turtle.select(13)
turtle.refuel()
turtle.select(1)

if (length == nil or width == nil) then
print ("Usage: flat <length> <width> <1=up else down>")
return
end

function empty()
if (turtle.getItemCount(slots) == 0) then
print(string.format("I am empty. Please load more materials in slot %d to continue.", slots))
while (turtle.getItemCount(slots) == 0) do
sleep(1)
end
end
if (turtle.getItemCount(cSlot) == 0) then
cSlot = cSlot + 1
turtle.select(cSlot)
end
end

for i=0,(width - 1),1 do

for j=1,(length - 1),1 do
empty()
turtle.forward()
if (dir==1) then turtle.placeUp()
else
turtle.placeDown()
end
end

if (i % 2 == 0) then

if (i ~= width - 1) then
turtle.turnRight()
turtle.forward()
turtle.turnRight()
empty()

turtle.placeDown()
end
else
if (i ~= width - 1) then
turtle.turnLeft()
turtle.forward()
turtle.turnLeft()
empty()
if (dir==1) then turtle.placeUp()
else
turtle.placeDown()
end
end
end


if (j ~= length - 1) then
empty()
if(dir==1) then turtle.placeUp()
else
turtle.placeDown()
end
end
end

print("\nSurface complete.")