SDMiner 2.1

-- uses Robust Turtle API: pastebin get 0TnEBf2P t
os.loadAPI("t")
local args = {...}
local versionNumber = "2.1"
local programName = "StarDustMiner"
local programNameShort = "SDMiner"
local startInventory = 2
local torchEnabled = true
local torchName = "minecraft:torch"

if #args ~= 2 then
	print ("Usage: "..programNameShort.." (Main Tunnel Length) (Individual Tunnel Length)")
	return
else
	mainTL = tonumber(args[1])
	indivTL = tonumber(args[2])
	if mainTL < 1 then
		print("Main Tunnel Length must be positive")
		return
	end
	if indivTL < 1 then
		print("Individual Tunnel Length must be positive")
		return
	end
	-- INITIAL SETUP FASE
	term.clear()
	term.setCursorPos(1,1)

	print("Welcome to"..programName.."Version "..versionNumber.." !")
	print("(Coded by MrHG using RobustTurtleAPI)")
	print("")
	sleep(1)
	-- FUEL CALCULATION
	-- for every 2 blocks after block 1 in MainTL, add 4 times IndivTL.
	-- then add 1 for every time you add 4xIndivTL. Then add another MainTL
	-- then add 80 just in case.
	local blocksToTravel = (2*mainTL) + (((math.floor(mainTL/2)+1)*4) * indivTL + 1) + 80
	if blocksToTravel>3000 then
		print("This will result in a mine bigger than 3000 blocks. Are you sure? (y/n)")
		if read()~="y" then
			print("Aborting operation")
			return
		end
	end
	print("Operation will need " .. blocksToTravel .. " fuel.")
	print("~" .. math.floor(blocksToTravel/80) .. " Pieces of coal.")
	print("Please ensure these are located in the top left slot.")
	print("To enable Torchmode, put torches next to the fuel.")
	print("Starting in 3 Seconds...")
	sleep(3)
	term.clear()
	print("Commencing Dig.")
end

function DisableTorchMode()
	print("No torches found, Disabling Torch Mode.")
	startInventory = 2
	torchEnabled = false
	return false
end

function checkForTorches()
	if torchEnabled == true then
		if turtle.getItemDetail(2) then
			if turtle.getItemDetail(2).name == torchName then
				startInventory = 3
				torchEnabled = true
				return true
			else
				DisableTorchMode()
			end
		else
			DisableTorchMode()
		end
	else
		startInventory = 2
	end
end

function Refuel(amountOfRequiredFuel)
	turtle.select(1)
	if (turtle.getFuelLevel() == "unlimited") then
		-- that's pretty neat dude.
		return
	end
	if (turtle.getFuelLevel() < amountOfRequiredFuel) then
		while (true) do
			if turtle.refuel(1) then
				if (turtle.getFuelLevel() > amountOfRequiredFuel) then
					break
				end
			else
				print("Turtle could not refuel. Please check why.")
				error()
			end
		end
	end
end

function PlaceTorch()
	if checkForTorches() then
		t.back()
		t.digUp()
		t.up()
		t.dig()
		t.place(2)
		t.down()
		t.forward()
	end
end

function DigIndivTunnel()
	for i=1,indivTL do
		Refuel(160)
		t.dig()
		t.forward()
		t.digUp()
		if indivTL % 7 ~= 0 and i % 7 == 0 and torchEnabled then
			t.up()
			t.right()
			t.forward()
			t.dig()
			t.back()
			t.place(2)
			t.left()
			t.down()
		end
	end
	if (torchEnabled) then
		PlaceTorch()
	end
	t.turnAround()
	Refuel(indivTL)
	t.forward(indivTL)
end

function EmptyInventory()
	local itemsDepositedCount = 0
	for i=startInventory,16 do
		turtle.select(i)
		itemsDepositedCount = itemsDepositedCount + turtle.getItemCount()
		if turtle.getItemCount() == 0 then
			--twiddle your thumbs
		elseif not turtle.drop() then
			print("Container full. Please empty it.")
			error()
		end
	end
	print("Deposited "..itemsDepositedCount.." Items.")
	if not torchEnabled then
		print("Torch mode currently Disabled.")
		print("Insert torches in slot 2 to enable.")
		sleep(3)
		torchEnabled = true
		if checkForTorches() then
			print("Torch mode Enabled.")
		end
	end
	turtle.select(1)
end

-- Main Block
checkForTorches()
t.turnAround()
EmptyInventory()
print("Inventory emptied. Heading out.")
t.turnAround()
local blocksAwayFromContainer = 0
for i=1,mainTL do
	Refuel(160)
	t.dig()
	t.forward()
	blocksAwayFromContainer = blocksAwayFromContainer + 1
	t.digUp()
	if not (i%2 == 0) then
		t.left()
		DigIndivTunnel()
		-- Inventory check
		turtle.select(14)
		if turtle.getItemCount() > 0 then
			t.right()
			t.forward(blocksAwayFromContainer)
			EmptyInventory()
			t.turnAround()
			t.forward(blocksAwayFromContainer)
			t.right()
		end
		DigIndivTunnel()
		turtle.select(14)
		if turtle.getItemCount() > 0 then
			t.left()
			t.forward(blocksAwayFromContainer)
			EmptyInventory()
			t.turnAround()
			t.forward(blocksAwayFromContainer)
		else
			t.right()
		end
	else
		Refuel(160)
		t.right()
		t.dig()
		t.up()
		t.dig()
		if (torchEnabled) then
			if checkForTorches() then
				t.place(2)
			end
		end
		t.turnAround()
		t.dig()
		t.down()
		t.dig()
		t.right()
	end
end
t.turnAround()
t.forward(mainTL)
EmptyInventory()
t.turnAround()
print("")
print("Dig Complete!")
print("Thank you for using "..programName.."!")
print("")