module Padrino::Helpers::RenderHelpers

def partial(template, options={})
  options.reverse_merge!(:locals => {}, :layout => false)
  path = template.to_s.split(File::SEPARATOR)
  object_name = path[-1].to_sym
  path[-1] = "_#{path[-1]}"
  template_path = File.join(path)
  raise 'Partial collection specified but is nil' if options.has_key?(:collection) && options[:collection].nil?
  if collection = options.delete(:collection)
    options.delete(:object)
    counter = 0
    collection.map { |member|
      counter += 1
      options[:locals].merge!(object_name => member, "#{object_name}_counter".to_sym => counter)
      render(template_path, nil, options.dup)
    }.join("\n")
  else
    if member = options.delete(:object)
      options[:locals].merge!(object_name => member)
    end
    render(template_path, nil, options.dup)
  end
end