FEATURE: Warn a user when they have few likes remaining

lib/rate_limiter.rb

@@ -67,6 +67,15 @@ class RateLimiter
     $redis.lpop(@key)
   end
 
+  def remaining
+    return @max if @user && @user.staff?
+
+    arr = $redis.lrange(@key, 0, @max) || []
+    t0 = Time.now.to_i
+    arr.reject! {|a| (t0 - a.to_i) > @secs}
+    @max - arr.size
+  end
+
   private
 
   def seconds_to_wait