100 words for jekyll feeds

gistfile1.rb

# Added to filters.rb

    def html_truncatewords(input, words = 15, truncate_string = "...")
      doc = Hpricot.parse(input)
      (doc/:"text()").to_s.split[0..words].join(' ') + truncate_string
    end

# Used in atom.xml

    <content type="html">{{ post.content |  html_truncatewords:100 | xml_escape }}</content>

# Also need to add in jekyll.rb

    require 'hpricot'