added core tag for ydoc

Rakefile

@@ -99,7 +99,7 @@ task :ydoc do
   require File.join(File.dirname(__FILE__), 'lib', 'mongo')
   out = File.join('ydoc', Mongo::VERSION)
   FileUtils.rm_rf('ydoc')
-  system "yardoc lib/**/*.rb lib/mongo/**/*.rb -p templates -o #{out} --title MongoRuby-#{Mongo::VERSION}"
+  system "yardoc lib/**/*.rb lib/mongo/**/*.rb -e yard_ext.rb -p templates -o #{out} --title MongoRuby-#{Mongo::VERSION}"
 end
 
 desc "Publish documentation to mongo.rubyforge.org"

lib/mongo/collection.rb

@@ -127,7 +127,7 @@ module Mongo
     # @raise [RuntimeError]
     #   if given unknown options
     #
-    # @see Official, <a href="http://dochub.mongodb.org/find" name="find-instance_method" rel="find">Official Docs</a>
+    # @core find
     def find(selector={}, opts={})
       fields = opts.delete(:fields)
       fields = ["_id"] if fields && fields.empty?

templates/default/tags/html/core.erb

@@ -0,0 +1,8 @@
+<% if object.has_tag?(:core) %>
+  <h3>Core docs:</h3>
+  <ul class="see">
+    <% for tag in object.tags(:core) %>
+      <li><%= linkify('http://dochub.mongodb.org/core/' + tag.name, tag.text || tag.name.capitalize) %></li>
+    <% end %>
+  </ul>
+<% end %>

templates/default/tags/setup.rb

@@ -0,0 +1,4 @@
+def init
+  super
+  sections[1].push :core
+end