use a common class for rdiscount options, filter out <h#> tags, add rel=nofollow

app/models/comment.rb

@@ -117,8 +117,7 @@ class Comment < ActiveRecord::Base
   end
 
   def generated_markeddown_comment
-    RDiscount.new(self.comment, :smart, :autolink, :safelink,
-      :filter_html).to_html
+    Markdowner.to_html(self.comment)
   end
     
   def comment=(com)

app/models/message.rb

@@ -78,8 +78,7 @@ class Message < ActiveRecord::Base
   end
   
   def linkified_body
-    RDiscount.new(self.body.to_s, :smart, :autolink, :safelink,
-      :filter_html).to_html
+    Markdowner.to_html(self.body)
   end
 
   def plaintext_body

app/models/story.rb

@@ -157,8 +157,7 @@ class Story < ActiveRecord::Base
   end
 
   def generated_markeddown_description
-    RDiscount.new(self.description.to_s, :smart, :autolink, :safelink,
-      :filter_html).to_html
+    Markdowner.to_html(self.description)
   end
 
   def description=(desc)

app/models/user.rb

@@ -62,8 +62,7 @@ class User < ActiveRecord::Base
   end
 
   def linkified_about
-    RDiscount.new(self.about.to_s, :smart, :autolink, :safelink,
-      :filter_html).to_html
+    Markdowner.to_html(self.about)
   end
 
   def recent_threads(amount)

extras/markdowner.rb

@@ -0,0 +1,18 @@
+class Markdowner
+  def self.to_html(text)
+    if text.blank?
+      return ""
+    else
+      html = RDiscount.new(text.to_s, :smart, :autolink, :safelink,
+        :filter_styles, :filter_html).to_html
+
+      # change <h1> headings to just emphasis tags
+      html.gsub!(/<(\/)?h(\d)>/) { |_| "<#{$1}strong>" }
+
+      # make links have rel=nofollow
+      html.gsub!(/<a href/, "<a rel=\"nofollow\" href")
+
+      html
+    end
+  end
+end