turtletest

bool inPit = false
int loops = 1

local function forward(count)
	if count == nil then count = 1 end
	for i = 0, count do
		turtle.forward()
	end
end

local function up(count)
	if count == nil then count = 1 end
	for i = 0, count do
		turtle.up()
	end
end

local function down(count)
	if count == nil then count = 1 end
	for i = 0, count do
		turtle.down()
	end
end

local function turnLeft(count)
	if count == nil then count = 1 end
	for i = 0, count do
		turtle.turnLeft()
	end
end

local function turnRight(count)
	if count == nil then count = 1 end
	for i = 0, count do
		turtle.turnRight()
	end
end

local function enterPit()
	turtle.forward(3)
	down()
	inPit = true
	return true
end

local function exitPit()
	turnLeft(2)
	up()
	forward(3)
	turnLeft(2)
	inPit = false
	return true
end

local function deposit()
	turnLeft()
	turtle.up()
	forward(2)
	for i = 3,16 do
		turtle.select(i)
		turtle.dropDown()
	end
	turtle.select(1)
	turnRight(2)
	forward(2)
	turtle.down()
	turnLeft()
	return true
end

local function refuel()
	if inPit then
		exitPit()
	end
	deposit()
	turnRight()
	turtle.select(2)
	turtle.place()
	turtle.select(1)
	turnLeft
	forward(2)
	down()
	turtle.digDown()
	os.sleep(3)
	turtle.placeDown()
	turtle.refuel()
	exitPit()
	forward()
	turnRight()
	turtle.dig()
	turtle.select(3)
	turtle.transferTo(2)
	return true
end

local function digLoopOnce()
	function turnCorner()
    	forward()
		turnRight()
		forward()
   	end
	turtle.digDown()
	turnLeft()
	turnCorner()
	turtle.digDown()
	turnCorner()
	turtle.digDown()
	turnCorner()
	turtle.digDown()
	turnCorner()
	turnRight()
end

local function start()
	enterPit()
	for i = 0,loops do
		if turtle.getFuelLevel() < 1000 then
			exitPit()
			refuel()
			enterPit()
		end

		digLoopOnce()
		if getItemCount(16) > 0 then
			deposit()
		end
	end
	exitPit()
end

start()