ComputerCraft FloorFiller/Platform Turtle Program

-- floor filler/ bridge maker? v1 by GooGoo @ pastebin, ThaWade @ ComputerCraft Forums
--[[
 Known bugs: when turtle runs out of blocks in slot 1 it continues going but places no blocks.
        No refuel.

TODO: Add a waitForBlocks bit of code. or make it check and move blocks to slot 1 while working?
    add refuel
]]

--edited on 14, Nov, 2014. Reason: Rewrite of program.

local tArgs = { ... }

if #tArgs ~= 1 then
    print( "Usage: floor <amount>" )
    return
end

-- CONFIGS --
length = tonumber(tArgs[1])
local countOne = turtle.getItemCount(1)
local countTwo = turtle.getItemCount(2)
local countThree = turtle.getItemCount(3)
local countFour = turtle.getItemCount(4)
local maxCount = 64
local minCount = 3
local minAddCount = 1
local getSpace = turtle.getItemSpace(1)
t = turtle
local blocksNeeded = length * 3
local manAddBlocks = (blocksNeeded) - ((countOne + countTwo) + (countThree + countFour)) --for checkBlockInv()
local moveBlocks = (blocksNeeded) - countOne
local totalBlocks = ((countOne + countTwo) + (countThree + countFour))
local yesOrNo
-- CONFIGS END --

function checkSlotOne()
    if countOne >= blocksNeeded then
        layFloor()
    elseif totalBlocks < blocksNeeded then
        fillSlot()
    elseif totalBlocks >= blocksNeeded then
        autoSortInv()
    else print("ERROR:@checkSlotOne() Func")
    end
end

function fillSlot()
        print("Please add atleast " ..manAddBlocks.." blocks to either slot 1 - 4.")
        sleep(2)
    repeat
        print("Have you added the blocks yet? Yes(y) or No(n)")
        yesOrNo = io.read()
            if yesOrNo == "y" then
                autoSortInv()
            elseif yesOrNo == "n" then
                exit()
            else print("Error:@fillSlot()! Type Y or N! If you did there's something wrong!")
            end
    until yesOrNo == "y" or yesOrNo == "n"
end

function checkBlockInv()
    if totalBlocks >= blocksNeeded then
        autoSortInv()
    end
end

local firstSlot,lastSlot = 1,4

function autoSortInv()
    if countOne < blocksNeeded then
        t.select(1)
        t.transferTo(1)
        t.select(2)
        t.transferTo(1)
        t.select(3)
        t.transferTo(1)
        t.select(4)
        t.transferTo(1)
        layFloor()
        if countOne >= blocksNeeded then
            print("layFloor() would run now from autoSort")
        end
    end
end
function rightFace()
    t.turnRight()
end

function leftFace()
    t.turnLeft()
end

function aboutFace()
  rightFace()
  rightFace()
end

function leftBlock() -- digs and places a block to the left
    leftFace()
    t.dig()
    t.place()
end

function frontBlock() --digs block in front of turtle.
    t.select(1)
    t.dig()
end

function rightBlock() --digs and places a block to the right.
    aboutFace()
    t.dig()
    t.place()
end

function moveUp() --moves forward one block.
    leftFace()
    t.forward()
end

function rearBlock() -- places block behind turtle.
    aboutFace()
    t.place()
    aboutFace()
end

function layFloor()
    for x = 1, length do
        frontBlock()
        leftBlock()
        rightBlock()
        moveUp()
        rearBlock()
    end
end

function startPos()--Goes back to where you started the turtle.
    t.forward()
end

checkSlotOne()

t.up()

aboutFace()

local home = length + 1

for z=1, home do
    startPos()
end