source/app/views/rss/practice_feed.rxml

#--######################################################################
# Copyright (c) 2008 IBM
# 
# All rights reserved. This program and the accompanying materials
# are made available under the terms of the Eclipse Public License v1.0
# which accompanies this distribution, and is available at
# http://www.eclipse.org/legal/epl-v10.html
#
# Contributors:
# 
# Ricardo Balduino:: Initial implementation, based on design discussions with Onno van der Straaten
#++######################################################################
# {Copyright (c) 2008 IBM}[link:files/COPYRIGHT.html]

record = (@practice)
imageSrc = ""

xml.instruct!
  #xml.rss "version" => "2.0", "xmlns:dc" => "http://purl.org/dc/elements/1.1/" do
  xml.rss "version" => "2.0", "xmlns:atom" => "http://www.w3.org/2005/Atom" do
  
  scope = @practice.presentation_name + " Practice" if @practice
  scope = ENV['EPFWIKI_APP_NAME'] unless @wiki
  
  wiki_page = record

  xml.channel do
    xml.title "#{scope}" 
    if @wiki
      xml.link wiki_page.url(true) 
      xml.atom:link, :href => "http://#{ENV['EPFWIKI_HOST']}/rss/#{@wiki.folder}/practice/#{@practice_name}", :rel => 'self', :type => 'application/rss+xml'      
    end
    
    xml.pubDate CGI.rfc1123_date(Time.now.gmtime) 
    
    xml.image do
      xml.url "http://" + ENV['EPFWIKI_HOST'] + "/" + "#{ENV['EPFWIKI_WIKIS_FOLDER']}/" + wiki_page.site.folder + "/" + "images/practice.gif"
      xml.link wiki_page.url(true)
      xml.title @practice.presentation_name
    end
    
    # xml.description h("Practice #{wiki_page.presentation_name} in '#{@wiki.title}' Wiki") # use this and remove the line below in case the practice itself is added as first item in the feed, see commented section below 
    xml.description wiki_page.overview_table # Gets the brief description from the element page

    # The first entry could be the practice itself, but is it redundant with the channel information above.
    #xml.item do
    #  xml.guid "WikiPage#{wiki_page.id.to_s}", :isPermaLink => false
    #  xml.title "#{wiki_page.presentation_name}"
    #  xml.link wiki_page.url(true)
    #  xml.description wiki_page.overview_table # Gets the brief description from the element page
    #  xml.pubDate CGI.rfc1123_date(Time.now.gmtime)
      #xml.dc_creator h(wiki_page.user.name) # this is raising an exception -> user is nil
    #end
    
    # crawls the practice page and finds all the elements the practice relates to
    match = /class="sectionTableHeading"(.*?)<\/td>/m.match(wiki_page.html) #finds first sectionTableHeading (Relationships table)
    if match
      sectionTableHeading = '<th class="sectionTableHeading"'+match[1]+'</td>'
      more_nodes = true
      while (more_nodes) do
        # finds the image that is included by the brief description of the element
        match1 = /img src="(.*?)"/m.match(sectionTableHeading)
        if match1
          imageTag = '<img src="'+match1[1]+'"'+' height="16" width="16">'
          imageSrc = match1[1]
          imageSrc = imageSrc.gsub("../", '')
          imageSrc = imageSrc.gsub("./", '')
          imageSrc = "http://" + ENV['EPFWIKI_HOST'] + "/" + "#{ENV['EPFWIKI_WIKIS_FOLDER']}/" + wiki_page.site.folder + "/" + imageSrc
          sectionTableHeading = sectionTableHeading.sub(imageTag, '') # removes the img section from the sectionTableHeading, so next time next image will be returned
          imageSrc = '<img src="'+imageSrc+'" width="16" height="16" />' # this is added to the brief description later
        end
        
        match2 = /a (.*?)<\/a>/m.match(sectionTableHeading) #finds first <a href...</a> section in the sectionTableHeading block returned
        if match2
          xml.item do
            aSection = '<a '+match2[1]+'</a>'
            match3 = /"\>(.*?)<\/a>/m.match(aSection) # returns the text in the <a></a> section
            title = match3[1]
            xml.title title
            match4 = /href="(.*?)"/m.match(aSection) # returns the relative path in the href attribute
            if match4
              aHref = match4[1]
              # extracts the "./../../../" and adds the full url of the wiki site to the relative path
              aHref = aHref.gsub("../", '')
              aHref = aHref.gsub("./", '')
              relPath = aHref # but the relative path is preserved for the purposes of using it on the wiki page query below
              aHref = "http://" + ENV['EPFWIKI_HOST'] + "/" + "#{ENV['EPFWIKI_WIKIS_FOLDER']}/" + wiki_page.site.folder + "/" + aHref
              xml.link aHref
            end
            page = WikiPage.find (:first, :conditions => ['rel_path=?', relPath]) # finds the page that is pointed by this relative path
            briefDescr = page.overview_table
            if briefDescr
              xml.description imageSrc+" "+briefDescr # returns the brief description of the element represented by this page, but first adds the relate image
            end
            xml.guid "WikiPage#{page.id.to_s}", :isPermaLink => false
            xml.pubDate CGI.rfc1123_date(Time.now.gmtime)
            
            sectionTableHeading = sectionTableHeading.gsub(aSection, '') # removes the used <a>...</a> section from the whole, so this block repeats for the next <a>..</a> section found
          end      
        else
          more_nodes = false
        end
      end
    end # ends crawler
  end
end