Computercraft platform builder

-- Turtle platform builder, builds a square platform using whatever stuff is in it's inventory
-- put fuel in any slot.
-- USAGE:     platform 10    (default is 8)
-- will build a 10x10 platform, one block below the turtle's position starting at the front-left of the platform
-- try to put fuel AFTER the blocks he's placing, otherwise he might try to place the fuel

-- this function places a whole row of stuff
function placeArow()
 for row=1,size-1 do
  k=1
  local count=0
  while count<1 do
   count=turtle.getItemCount(k)
   k=k+1
   if (k>16) then
    print("No more materials! add some...it's ok, I'll wait...")
    os.sleep(10)
    k=1;
   end --endif
  end  --endwhile
  turtle.select(k-1)
  turtle.placeDown()
  turtle.forward()
  end  -- next row
  turtle.placeDown()
 end

 function grabFuel()
 for i=1,16 do
  turtle.select(i)
  turtle.refuel()
 end
end

-------------------  START
args = {...}
size = args[1]
if (size=="") then
 size=8
end

print ("building platform of "..size.." x "..size..", "..turtle.getFuelLevel().." Fuel left..")
grabFuel()

for column=1,math.floor(size/2) do
 placeArow()
 turtle.turnRight()
 turtle.forward()
 turtle.turnRight()

 grabFuel()

 placeArow()
 turtle.turnLeft()
 turtle.forward()
 turtle.turnLeft()
end -- next column

turtle.turnLeft()
for i=1,size do
 turtle.forward()
end
turtle.turnRight()
print("I'm done here, hope you like my work.")