radiant_grab_bag.rb

# Radiant CMS grab-bag of features.
# Some of there are quite hackish in that that they copy+paste and then modify code from Radiant itself; thus a lot of this code might only work against version 0.6.9 of Radiant.

# Page extensions; in your extension create a file called lib/page_extensions.rb with the content:

module PageExtensions
  def self.included(base)
    base.class_eval <<-EODATA
      #this snippet adds a has_content="true|false" attribute to the if_content tag, so that the tag only expands of content if the part exists, and if the part has non-blank content.
      tag 'if_content' do |tag|
        page = tag.locals.page
        part_name = tag_part_name(tag)
        parts_arr = part_name.split(',')
        inherit = boolean_attr_or_error(tag, 'inherit', 'false')
        find = attr_or_error(tag, :attribute_name => 'find', :default => 'all', :values => 'any, all')
        has_content = boolean_attr_or_error(tag, 'has_content', 'false')
        expandable = true
        one_found = false
        part_page = page
        parts_arr.each do |name|
          name.strip!
          if inherit
            while (part_page.part(name).nil? and (not part_page.parent.nil?)) do
              part_page = part_page.parent
            end
          end
          x = part_page.part(name)
          expandable = false if (has_content ? (x.nil? || x.content.blank?) : x.nil?)
          one_found ||= true if (has_content ? (!x.nil? && !x.content.blank?) : !x.nil?)
        end
        expandable = true if (find == 'any' and one_found)
        tag.expand if expandable
      end

      #this snippet allows you to alias one page to another page, so that every tag operating on the page that's aliasing actually operates on the aliased page.
      #This can make nafigation a bit easier, if you want to have a bunch of pages under another page, but the parent page doesn't have any content of it's own.
      #Just alias the parent page to one of the child pages, and your problem is solved.
      #to alias a page, on the page that's aliasing, add a part called "Alias For" and set it's value to the path to the aliased page.
      #E.g. if you want /vip-club to alias to /vip-club/vip-card, add a part called "Alias For" to /vip-club, with the content /vip-club/vip-card.
      private
      @parser = @context = nil
      def lazy_initialize_parser_and_context
        unless @parser and @context
          page = (p = part("Alias For")).nil? ? self : Page.find_by_url(p.content)
          page.instance_variable_set(:@request, @request)
          page.instance_variable_set(:@response, @response)
          @context = PageContext.new(page)
          @parser = Radius::Parser.new(@context, :tag_prefix => 'r')
        end
        @parser
      end
    EODATA
  end
end


# and put this line in your extension.rb#activate method:

Page.send(:include, PageExtensions)

# Feel free to remove any extensions you don't want.