moving basic htmlization of post content into the model.

two immediate benefits:
1. we can test Post output in a unit test
2. we can easily support new storage formats (like markdown and raw
   html) without writing new view logic

app/helpers/application_helper.rb

@@ -34,9 +34,8 @@ def twitterize(string)
   end
 
   def clean_content_for(post)
-    text = post.content
+    text = post.to_html
     text.gsub!(/<(script|noscript|object|embed|style|frameset|frame|iframe)[>\s\S]*<\/\1>/, '') if post.from_feed?
-    text = RedCloth.new(text, [:filter_styles, :no_span_caps]).to_html
     text = spanify_links(text)
   end
 

app/models/post.rb

@@ -45,4 +45,10 @@ def deleted?
   def link(root='')
     "#{root}/#{type.tableize}/#{to_param}"
   end
+
+  def to_html
+    text = content
+    text = RedCloth.new(text, [:filter_styles, :no_span_caps]).to_html
+  end
+
 end