partials.rb

# stolen from http://github.com/cschneid/irclogger/blob/master/lib/partials.rb
# and made a lot more robust by me
# this implementation uses erb by default. if you want to use any other template mechanism
# then replace `erb` on line 13 and line 17 with `haml` or whatever
module Sinatra::Partials
  def partial(template, *args)
    template_array = template.to_s.split('/')
    template = template_array[0..-2].join('/') + "/_#{template_array[-1]}"
    options = args.last.is_a?(Hash) ? args.pop : {}
    options.merge!(:layout => false)
    if collection = options.delete(:collection) then
      collection.inject([]) do |buffer, member|
        buffer << erb(:"#{template}", options.merge(:layout =>
        false, :locals => {template_array[-1].to_sym => member}))
      end.join("\n")
    else
      if Module.constants.include?("Haml")
        haml(:"#{template}", options)
      else
        erb(:"#{template}", options)
      end
    end
  end
end

added haml detection... assumes that if the constant Haml is present then you are most likely wanting to render via haml instead of erb