fixes #2066

app/helpers/tags_helper.rb

@@ -1,2 +1,7 @@
 module TagsHelper
+  def tag_post_count_style(tag)
+    @highest_post_count ||= Tag.highest_post_count
+    width_percent = Math.log(tag.post_count, @highest_post_count) * 100
+    "background: linear-gradient(to left, #DDD #{width_percent}%, white #{width_percent}%)"
+  end
 end

app/models/tag.rb

@@ -41,6 +41,12 @@ class Tag < ActiveRecord::Base
       def counts_for(tag_names)
         select_all_sql("SELECT name, post_count FROM tags WHERE name IN (?)", tag_names)
       end
+
+      def highest_post_count
+        Cache.get("highest-post-count", 4.hours) do
+          select("post_count").order("post_count DESC").first.post_count
+        end
+      end
     end
 
     def real_post_count

app/views/tags/index.html.erb

@@ -12,7 +12,7 @@
       <tbody>
         <% @tags.each do |tag| %>
           <tr>
-            <td><%= tag.post_count %></td>
+            <td style="<%= tag_post_count_style(tag) %>"><%= tag.post_count %></td>
             <td class="category-<%= tag.category %>">
               <%= link_to("?", show_or_new_wiki_pages_path(:title => tag.name)) %>
               <%= link_to(tag.name, posts_path(:tags => tag.name)) %>