Adds pinterest buttons on markup containing images

pinterestify.rb

# Takes some markup (html or markdown) and wraps img elements into
# a div with a pinterest share link before image
# Params:
#   markup - html or markdown that contains the images
#   url - url for the shared item on pinterest
#   desc - description for shared item on pinterest
#   markdown - (optional) true if markup needs to be parsed as markdown (default), otherwise false
#   wrap_class - (optional) css class for the img wrapper (default: pin-wrapper)
#   pin_text - (optional) text for the pinterest link (default: Pin to Pinterest)
def pinterestify(markup, url, desc, options = {})
  markdown = options[:markdown] || true
  wrap_class = options[:wrap_class] || "pin-wrapper"
  pin_text = options[:pin_text] || "Pin to Pinterest"

  if markdown
    markup = markdown(markup)
  end
  parsed_html = Nokogiri::HTML.fragment(markup)
  parsed_html.css("img").wrap("<div class='" + wrap_class +"'></div>")
  parsed_html.css("img").each do |img_el|
    img_el.add_previous_sibling("<a target='_blank' class='auto-pin-link' href='https://pinterest.com/pin/create/button/?url=#{url}&description=#{desc}&media=#{img_el['src']}'>"+ pin_text +"</a>")
  end
  parsed_html
end