safetyBridge

local tArgs = { ... }

if #tArgs ~= 1 then
    print( "Usage: bridge <length>" )
    return
end

-- Initial Fueling
turtle.refuel(1)

-- variable to tell main function when to stop
local o = 1

-- Function to get the fuel level of the robot as a number
fcount = function()
        return turtle.getFuelLevel()
end

-- Move forward, Fuel Check and Refuel function
forwardCheck = function()
        turtle.forward()

        if fcount() < 1 then
                turtle.select(1)
                print ("Attempting to eat my fuel...")
                if turtle.getItemCount(1) < 1 then
					print ("I am out of fuel...")
					o = 0
                end
                turtle.refuel(1)
                turtle.select(2)
        end
end

buildBridge = function(length)
	local i = 0
	while i < length do
		placeBlocks()
		while turtle.detect() do
			turtle.attack()
			turtle.attackUp()
			turtle.dig()
		end
		forwardCheck()
		i = i + 1
	end
	turtle.turnRight()
	turtle.turnRight()
	for i=1,length do
		turtle.forward()
	end
end

placeBlocks = function()
	if not turtle.detectDown() then
		turtle.select(2)
		turtle.placeDown()
	end
	turtle.turnLeft()
	if not turtle.detect() then
		turtle.select(2)
		turtle.place()
	end
	turtle.turnRight()
	turtle.turnRight()
	if not turtle.detect() then
		turtle.select(2)
		turtle.place()
	end
	turtle.turnLeft()
end

buildBridge(tonumber(tArgs[1]))