class Infobar::Frequency

def call(&block)
  now = Time.now
  if !@update || now - @update > @duration
    update now: now
    block.call
  end
end

def initialize(duration)
  @duration = duration.to_f
  @called   = 0
end

def reset
  @update = nil
  @called = 0
  self
end

def to_s
  @duration.to_s
end

def update(now: Time.now)
  @update = now
  @called += 1
end