change intro explorer to use popular searches

app/logical/popular_search_service.rb

@@ -7,8 +7,8 @@ class PopularSearchService
     @scale = scale
   end
 
-  def each_search(&block)
+  def each_search(&block, limit = 100)
-    fetch_data.scan(/(.+?) (\d+)\.0\n/).each(&block)
+    fetch_data.scan(/(.+?) (\d+)\.0\n/).slice(0, limit).each(&block)
   end
 
   def fetch_data

app/presenters/intro_presenter.rb

@@ -1,11 +1,7 @@
 class IntroPresenter
-  def popular_tags
-    Tag.where("category = 3").order("post_count desc").limit(8).map(&:name)
-  end
-
   def each
-    popular_tags.each do |tag|
+    PopularSearchService.new(Date.today, "week").each_search(20) do |query, count|
-      yield(tag, PostSets::Intro.new(tag))
+      yield(query, PostSets::Intro.new(query))
     end
   end
 end

app/views/explore/posts/intro.html.erb

@@ -10,7 +10,7 @@
       <% end %>
     </header>
 
-    <p style="text-align: center;">Type in your favorite anime, manga, or character (last name first). Here are some examples:</p>
+    <p style="text-align: center;">Type in your favorite anime, manga, or character (last name first). Here are some popular examples:</p>
 
     <% cache("intro-page", :expires_in => 1.hour) do %>
       <% @presenter.each do |tag, post_set| %>