class Rubycritic::RevisionComparator

def smells_before
  serializer = SmellsSerializer.new(revision_file)
  if File.file?(revision_file)
    serializer.load
  else
    smells = nil
    @source_control_system.travel_to_head do
      smells = AnalysersRunner.new(paths_of_tracked_files).smells
    end
    serializer.dump(smells)
    smells
  end
end