added meta description tag

app/presenters/wiki_page_presenter.rb

@@ -9,6 +9,10 @@ class WikiPagePresenter
     wiki_page.body.split(/\r\n|\r|\n/).first
   end
   
+  def blurb
+    excerpt.gsub(/<.+?>/, "")
+  end
+  
   # Produce a formatted page that shows the difference between two versions of a page.
   def diff(other_version)
     pattern = Regexp.new('(?:<.+?>)|(?:[0-9_A-Za-z\x80-\xff]+[\x09\x20]?)|(?:[ \t]+)|(?:\r?\n)|(?:.+?)')

app/views/posts/index.html.erb

@@ -31,3 +31,9 @@
   </div>
 </div>
 
+<%= content_for(:html_header) do %>
+  <%= auto_discovery_link_tag :atom, :controller => "posts", :action => "index", :format => "atom", :tags => params[:tags] %>
+  <% if @post_set.wiki_page %>
+    <meta name="description" content="<%= @post_set.wiki_page.presenter.blurb %>"></meta>
+  <% end %>
+<% end %>

app/views/wiki_pages/_form.html.erb

@@ -2,7 +2,7 @@
   <%= error_messages_for("wiki_page") %>
 
   <%= simple_form_for(@wiki_page) do |f| %>
-    <%= f.input :title %>
+    <%= f.input :title, :as => :string %>
     
     <%= dtext_field "wiki_page", "body" %>