Improved turtle program

-- This Version
-- 2.13 10/11/2014
-- ChangeLogs
-- 2.04 - Adding Left or Right Support
-- 2.05 - Changing Lot Code For Some Stable And Cleaner Code
-- 2.06 - Ops Forget Fuel Chcking Code after rewrtitting
-- 2.07 - Woops My Bad i wrote back() not Back()
-- 2.08 - Fixing Imputs
-- 2.09 - Forget That i change remove line of code since i use local function now
-- 2.10 - Minor error with back that it leave one block in wall
--    Change: Torch spacing to 8 from 10
-- 2.11 - Change: Right to left and Left to Right better understand
-- 2.12 - Add Stop Code when item are gone
-- 2.13 - i made big mistake i forget to end to new stop code
-- ToDoList
-- Add Code to place torch each time it starts
-- Add Fuel Code so can know almost how much fuel you need
-- Add second fuel slot if you go allout diggin
-- Mabye add code that make turtle make new line of tunnels

--Local
local distance = 0 -- How Far Did User Pick
local chest = turtle.getItemCount(2) -- How many items are in slot 2 (chest)
local ItemFuel = turtle.getItemCount(1) -- How many items are in slot 3 (Fuel)
local MD = 3 -- How Many Blocks Apart From Each Mine
local MineTimes = 0 -- If Multi Mines Are ON then This will keep Count
local Fuel = 0 -- if 2 then it is unlimited no fuel needed
local NeedFuel = 0 -- If Fuel Need Then 1 if not Then 0
local Error = 0 -- 0 = No Error and 1 = Error
local Way = 0 -- 0 = Left and 1 = Right
local RowSpace = 0 -- The space between each row

--Checking
local function Check()
    if chest == 0 then
        print("there are no chests")
        Error = 1
    else
        print("There are chest in turtle")
    end
    if ItemFuel == 0 then
        print("No Fuel Items")
        Error = 1
    else
        print("there is fuel")
    end
    repeat
        if turtle.getFuelLevel() == "unlimited" then
            print("NO NEED FOR FUEL")
            Needfuel = 0
        elseif turtle.getFuelLevel() < 100 then
            turtle.select(3)
            turtle.refuel(1)
            Needfuel = 1
            ItemFuel = ItemFuel - 1
        elseif NeedFuel == 1 then
            Needfuel = 0
        end
    until NeedFuel == 0
end

-- Recheck if user forget something turtle will check after 15 sec
local function Recheck()
    chest = turtle.getItemCount(2)
    ItemFuel = turtle.getItemCount(1)
    Error = 0
end

--Mining
local function ForwardM()
    repeat
        if turtle.detect() then
            turtle.dig()
        end
        if turtle.forward() then -- sometimes sand and gravel and block and mix-up distance
            TF = TF - 1
        end
        if turtle.detectUp() then
            turtle.digUp()
        end
        turtle.select(3)
        turtle.placeDown()
        if turtle.getItemCount(16)>0 then -- If slot 16 in turtle has item slot 5 to 16 will go to chest
            if chest > 0 then
                turtle.select(2)
                turtle.digDown()
                turtle.placeDown()
                chest = chest - 1
                for slot = 5, 16 do
                    turtle.select(slot)
                    turtle.dropDown()
                    sleep(1.5)
                end
                turtle.select(5)
            else
                print("turtle run out of chest")
                os.shutdown()
            end
        end
        repeat
            if turtle.getFuelLevel() == "unlimited" then
                print("NO NEED FOR FUEL")
                Needfuel = 0
            elseif turtle.getFuelLevel() < 100 then
                turtle.select(1)
                turtle.refuel(1)
                Needfuel = 1
                ItemFuel = ItemFuel - 1
            elseif ItemFuel == 0 then
                print("turtle run out of fuel")
                os.shutdown()
            elseif NeedFuel == 1 then
                Needfuel = 0
            end
        until NeedFuel == 0
    until TF == 0
end

--Warm Up For Back Program
local function WarmUpForBackProgram() -- To make turn around so it can go back
    turtle.turnLeft()
    turtle.turnLeft()
    turtle.up()
end

--Back Program
local function Back()
    repeat
        if turtle.forward() then -- sometimes sand and gravel and block and mix-up distance
            TB = TB - 1
        end
        if turtle.detect() then -- Sometimes sand and gravel can happen and this will fix it
            if TB ~= 0 then
                turtle.dig()
            end
        end
    until TB == 0
end

-- Multimines Program
local function MultiMines()
    if Way == 1 then
        turtle.turnLeft()
        turtle.down()
    else
        turtle.turnRight()
        turtle.down()
    end
    repeat
        if turtle.detect() then
            turtle.dig()
        end
        if turtle.forward() then
            MD = MD - 1
        end
        if turtle.detectUp() then
            turtle.digUp()
        end
    until MD == 0
    if Way == 1 then
        turtle.turnLeft()
    else
        turtle.turnRight()
    end
    if MineTimes == 0 then
        print("Turtle is done")
    else
        MineTimes = MineTimes - 1
    end
end

-- Restart
local function Restart()
    TF = distance
    TB = distance
    MD = RowSpace
end

-- Starting
function Start()
    repeat
        ForwardM()
        WarmUpForBackProgram()
        Back()
        MultiMines()
        Restart()
    until MineTimes == 0
end

-- Start
print("Hi there, welcome to Matix's improved turtle script.\n")
print("How far will turtle go?")
input = io.read()
distance = tonumber(input)
TF = distance
TB = distance
print("left or right?")
print("0: Left\n1: Right")
input2 = io.read()
Way = tonumber(input2)
print("How many rows will the turtle mine?")
input3 = io.read()
MineTimes = tonumber(input3)
print("How much space should be left between each row?")
print("1 = no space")
RowSpace = tonumber(io.read())
MD = RowSpace
Check()
if Error == 1 then
    repeat
        sleep(10)
        Recheck()
        Check()
    until Error == 0
end
Start()