Adds first 150 chars of content as meta description, if no page.description specified. Fixes #162

plugins/octopress_filters.rb

@@ -56,6 +56,13 @@ module OctopressLiquidFilters
     end
   end
 
+  # Extracts raw content DIV from template, used for page description as {{ content }}
+  # contains complete sub-template code on main page level
+  def raw_content(input)
+    /.<div class="entry-content">(?<content>[\s\S]*?)<\/div>\s*<\/article>/ =~ input
+    return (content.nil?) ? input : content
+  end
+
   # Replaces relative urls with full urls
   def expand_urls(input, url='')
     url ||= '/'