RedstoneCellTurtle

local version = "1.4"
local torchDistance = 10
local torchCount = 1
local turn = ""

local gate = peripheral.wrap("right")

local function doScreen(str)
	term.clear()
	term.setCursorPos(1,1)
	write("Redstone Cell Turtle - v")
	print(version)
	print("------------------------------")
	write("Fuel: ")
	print(turtle.getFuelLevel())
	print()
	print(str)
end

local function swapCells()
	doScreen("Getting fresh redstone cell from base...")

	turtle.select(1)
	turtle.transferTo(14)
	turtle.select(16)
	turtle.digDown()
	turtle.transferTo(1)
	turtle.select(1)
	while turtle.getItemCount(1) > 0 do
		redstone.setOutput("front",true)
		os.sleep(0.2)
		redstone.setOutput("front",false)
		os.sleep(0.2)
	end
	while turtle.getItemCount(1) == 0 do
		os.sleep(0.2)
	end
	turtle.placeDown()
	redstone.setOutput("front",true)
	while not redstone.getInput("front") do
		os.sleep(0.2)
	end
	turtle.select(14)
	turtle.transferTo(1)
	turtle.select(1)
	doScreen("New redstone cell deployed.")
end

local function doTorch()
	torchCount = torchCount + 1
	if torchCount > torchDistance then
		torchCount = 1
		turtle.select(15)
		turtle.placeUp()
	end
end

local function fill()
	local i = 1
	while turtle.getItemCount(i) == 0 and i < 15 do
		i = i + 1
	end
	if i < 15 then
		turtle.select(i)
		turtle.placeDown()
	end
end

doScreen("Place items as follows...")
print("--------------------------")
print("| Torches in 15 (optional)")
print("| Redstone Cell in 16")
print("| Fill rest with cobble (optional)")
while (turtle.getItemCount(16)==0) do
	os.sleep(0.2)
end

redstone.setOutput("front",true)
doScreen("Waiting for lead turtle...")
while not redstone.getInput("front") do
	os.sleep(0.1)
end

turtle.select(16)
turtle.placeDown()
while true do
	doScreen("Powering...")
	doTorch()
	while redstone.getInput("front") do
		if gate.get()["No Energy"] then
			swapCells()
		end
		os.sleep(0.5)
	end
	doScreen("Moving...")

	turtle.select(16)
	turtle.digDown()
	fill()
	redstone.setOutput("front",false)
	while not turtle.forward() do
		os.sleep(0.1)
	end
	turtle.select(16)
	turtle.placeDown()
	while not redstone.getInput("front") do
		doScreen("Searching for lead turtle...")
		turtle.turnRight()
	end
	redstone.setOutput("front",true)
end