Class: Webgen::SourceHandler::Feed

Inherits:
Object
  • Object
show all
Includes:
Base, WebsiteAccess
Defined in:
lib/webgen/sourcehandler/feed.rb

Overview

Source handler for creating atom and/or rss feeds.

Constant Summary collapse

MANDATORY_INFOS =

The mandatory keys that need to be set in a feed file.

%W[site_url author entries]

Instance Method Summary collapse

Methods included from Base

#node_exists?, #output_path, #page_from_path

Methods included from Base::OutputPathHelpers

#standard_output_path

Methods included from Loggable

#log, #puts

Methods included from WebsiteAccess

included, website

Constructor Details

#initialize ⇒ Feed

:nodoc:



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# File 'lib/webgen/sourcehandler/feed.rb', line 15

def initialize # :nodoc:
  website.blackboard.add_listener(:node_changed?, method(:node_changed?))
end

Instance Method Details

#content(node) ⇒ Object

Return the rendered feed represented by node.



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# File 'lib/webgen/sourcehandler/feed.rb', line 44

def content(node)
  website.cache[[:sourcehandler_feed, node.node_info[:src]]] = feed_entries(node).map {|n| n.absolute_lcn}
  block_name = node.node_info[:feed_type] + '_template'
  if node.node_info[:feed].blocks.has_key?(block_name)
    node.node_info[:feed].blocks[block_name].
      render(Webgen::ContentProcessor::Context.new(:chain => [node])).content
  else
    feed = (website.cache.volatile[:sourcehandler_feed] ||= {})[node.node_info[:src]] ||= build_feed_for(node)
    feed.feed_type = node.node_info[:feed_type]
    feed.build_xml
  end
end

#create_node(parent, path) ⇒ Object

Create atom and/or rss feed files from parent and path.



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# File 'lib/webgen/sourcehandler/feed.rb', line 20

def create_node(parent, path)
  page = page_from_path(path)
  path.meta_info['link'] ||= parent.absolute_lcn

  if MANDATORY_INFOS.any? {|t| path.meta_info[t].nil?}
    raise "One of #{MANDATORY_INFOS.join('/')} information missing for feed <#{path}>"
  end

  create_feed_node = lambda do |type|
    path.ext = type
    super(parent, path) do |node|
      node.node_info[:feed] = page
      node.node_info[:feed_type] = type
    end
  end

  nodes = []
  nodes << create_feed_node['atom'] if path.meta_info['atom']
  nodes << create_feed_node['rss'] if path.meta_info['rss']

  nodes
end

#feed_entries(node) ⇒ Object

Helper method for returning the entries for the feed node node.



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# File 'lib/webgen/sourcehandler/feed.rb', line 58

def feed_entries(node)
  nr_items = (node['number_of_entries'].to_i == 0 ? 10 : node['number_of_entries'].to_i)
  patterns = [node['entries']].flatten.map {|pat| Pathname.new(pat =~ /^\// ? pat : File.join(node.parent.absolute_lcn, pat)).cleanpath.to_s}

  node.tree.node_access[:alcn].values.
    select {|node| patterns.any? {|pat| node =~ pat} && node.node_info[:page]}.
    sort {|a,b| a['modified_at'] <=> b['modified_at']}.
    reverse[0, nr_items]
end