plugin.rb

class NodePlugin < StagingPlugin
  # TODO - Is there a way to avoid this without some kind of 'register' callback?
  # e.g. StagingPlugin.register('sinatra', __FILE__)
  def framework
    'node'
  end

  def stage_application
    Dir.chdir(destination_directory) do
      create_app_directories
      copy_source_files
      create_startup_script
    end
  end

  # Let DEA fill in as needed..
  def start_command
    "%VCAP_LOCAL_RUNTIME% #{detect_main_file} $@"
  end

  private
  def startup_script
    vars = environment_hash
    generate_startup_script(vars)
  end

  # TODO - I'm fairly sure this problem of 'no standard startup command' is
  # going to be limited to Sinatra and Node.js. If not, it probably deserves
  # a place in the sinatra.yml manifest.
  def detect_main_file
    file, js_files = nil, app_files_matching_patterns

    if js_files.length == 1
      file = js_files.first
    else
      # We need to make this smarter, and then allow client to choose or
      # send us a hint.

      ['server.js', 'app.js', 'index.js', 'main.js', 'application.js'].each do |fname|
        file = fname if js_files.include? fname
      end
    end

    # TODO - Currently staging exceptions are not handled well.
    # Convert to using exit status and return value on a case-by-case basis.
    raise "Unable to determine Node.js startup command" unless file
    file
  end
end