require 'yajl/json_gem' module Docs  class Manifest    FILENAME = 'docs.json'     def initialize(store, docs)      @store = store      @docs = docs    end     def store      @store.write FILENAME, to_json    end     def as_json      @docs.each_with_object [] do |doc, result|        next unless @store.exist?(doc.meta_path)        result << JSON.parse(@store.read(doc.meta_path))      end    end     def to_json      JSON.pretty_generate(as_json)    end  endend