class RubyCritic::RevisionComparator

def initialize(paths)
  @paths = paths
end

def load_cached_analysed_modules
  Serializer.new(revision_file).load if File.file?(revision_file)
end

def revision_file
  @revision_file ||= File.join(
    Config.root,
    SNAPSHOTS_DIR_NAME,
    VERSION,
    Digest::MD5.hexdigest(Marshal.dump(@paths)),
    Config.source_control_system.head_reference
  )
end

def set_statuses(analysed_modules_now)
  if Config.source_control_system.revision?
    analysed_modules_before = load_cached_analysed_modules
    if analysed_modules_before
      SmellsStatusSetter.set(
        analysed_modules_before.flat_map(&:smells),
        analysed_modules_now.flat_map(&:smells)
      )
    end
  end
  analysed_modules_now
end