function main(distance, turtles)
	print("starting main")
	turtle.refuel()
	purge()


	for i = 1, 20 do
		mine(distance, turtles)
	end

end

function mine(length, turnLength)
	mineLine(length)
	purge()

	turtle.turnRight()
	mineLine(turnLength)

	turtle.turnRight()
	mineLine(length)
	purge()

	turtle.turnLeft()
	mineLine(turnLength)

	turtle.turnLeft()

end


function mineLine(dist)
	print("Starting: mineLine("..dist..")")
	i = 0
	while i <= dist do
		if not turtle.forward() then
			success, data = turtle.inspect()
			if success then
				isMiner = string.sub(data.name, 1, 5) == "Compu"
				if not isMiner then
					turtle.dig()
				end
			end
		else
			i = i + 1
		end

		if turtle.detectUp() then
			turtle.digUp()
		end

		if turtle.detectDown() then
			turtle.digDown()
		end
	end
end


function purge()
	print("Starting purge")
	for i = 1, 16 do
		turtle.select(i)
		data = turtle.getItemDetail()
		if data then
			if data.name == "minecraft:cobblestone" or data.name == "minecraft:dirt" or data.name == "minecraft:sand" or data.name == "minecraft:flint" or data.name == "minecraft:gravel" then
				turtle.drop()
				print("Turtle dropped: " ..data.count.. " " ..data.name)
			end
		end
	end
end

main()