Class: Audrey2::Aggregator

Inherits:
Object
  • Object
show all
Defined in:
lib/audrey2.rb

Instance Method Summary collapse

Constructor Details

#initialize(configfile) ⇒ Aggregator

Returns a new instance of Aggregator.



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# File 'lib/audrey2.rb', line 83

def initialize(configfile)
  init_config(configfile)
end

Instance Method Details

#feed_me(recipe_name) ⇒ Object 



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# File 'lib/audrey2.rb', line 87

def feed_me(recipe_name)
  begin
    # Load recipe and theme and make sure everything is in order
    recipe = load_recipe(recipe_name)
    output_file = recipe[:output_file]
    verify_output_file(output_file)
    max_entries = recipe[:max_entries] || 1000

    # Load theme
    init_theme(recipe[:theme])

    # Download and parse the feeds
    entry_sources = {}
    feeds = recipe[:feeds].collect { |feed| parse_feed(feed, entry_sources) }

    # Aggregate and sort the entries
    entries = []
    feeds.each { |feed| entries += feed.entries }
    entries.sort! &entry_sort_comparator

    # Prepare template evaluation scope including any helper code defined in the theme
    scope = Object.new
    scope.instance_eval(@helper_code) if @helper_code

    # Output the aggregated entries
    output = ''
    engine ||= Haml::Engine.new(@entry_template)

    entries[0..max_entries - 1].each do |entry|
      output << engine.render(scope, :entry => entry, :source => entry_sources[entry])
    end

    File.open(output_file, 'w') { |f| f << output }
  rescue Exception => e
    # NOTE: This also catches SystemExit as can be raise by Kernel#exit when recipes
    # and themes are loaded and verified. Is it good to handle those events here? Perhaps ...
    if @email
      email(<<-EOF
An exception occurred while running recipe #{recipe_name}

Exception: #{e}

Backtrace:

#{e.backtrace}
EOF
      )
    else
      $stderr.puts "An exception occurred while running recipe #{recipe_name}:\n\n#{e}\n#{e.backtrace}"
      exit(1)
    end
  end
end