Bridge

-- bridge
os.loadAPI("t")
local args = {...}
term.clear()
term.setCursorPos(1,1)
print("Attempting to bridge.")
turtle.select(1)
diagonalRight = false
diagonalLeft = false
messageSent = false
if #args > 0 then
    if args[1] == "right" then
        diagonalRight = true
    elseif args[1] == "left" then
        diagonalLeft = true
    else
        print("Please specify left or right")
    end
end
while true do
	if turtle.getItemCount() > 0 then
		messageSent = false
		t.forward(1)
		t.digDown(1)
		t.placeDown(1)
        if diagonalRight then
            if turned then
                turtle.turnLeft()
                turned = false
            else
                turtle.turnRight()
                turned = true
            end
        end
        if diagonalLeft then
            if turned then
                turtle.turnRight()
                turned = false
            else
                turtle.turnLeft()
                turned = true
            end
        end
	else
		if messageSent == false then
			print("Insert more blocks in slot 1 to continue.")
			messageSent = true
		end
		sleep(5)
	end
end