old_contents: """
  nbcomet: Jupyter Notebook extension to track notebook history
  """
  
  import os
  import json
  import datetime
  from hashlib import sha1
  
  def find_storage_dir():
      storage_dir = default_storage_dir()
      filename = os.path.expanduser('~/.jupyter/nbconfig/notebook.json')
      if os.path.isfile(filename):
          with open(filename) as data_file:
              data = json.load(data_file)
              try:
                  if data["Comet"]["data_directory"]:
                      storage_dir = data["Comet"]["data_directory"]
              except:
                  pass
      if not os.path.exists(storage_dir):
          create_dir(storage_dir)
      return storage_dir
  
  def default_storage_dir():
      return os.path.expanduser('~/.jupyter/nbcomet')
  
  def create_dir(directory):
      try:
          os.makedirs(directory)
      except OSError:
          pass
  
  def was_saved_recently(version_dir, min_time=60):
      """ check if a previous version of the file has been saved recently
  
      version_dir: (str) dir to look for previous versions
      min_time: (int) minimum time in seconds allowed between saves """
  
      versions = [f for f in os.listdir(version_dir)
          if os.path.isfile(os.path.join(version_dir, f))
          and f[-6:] == '.ipynb']
      if len(versions) > 0:
          vdir, vname = os.path.split(versions[-1])
          vname, vext = os.path.splitext(vname)
          last_time_saved = datetime.datetime.strptime(vname[-26:],
              "%Y-%m-%d-%H-%M-%S-%f")
          delta = (datetime.datetime.now() - last_time_saved).seconds
          return delta <= min_time
      else:
          return False
  
  def hash_path(path):
      h = sha1(path.encode())
      return h.hexdigest()[0:8] #only need first 8 chars to be uniquely identified
  
new_contents: """
  nbcomet: Jupyter Notebook extension to track notebook history
  """
  
  import os
  import json
  import datetime
  from hashlib import sha1
  
  def find_storage_dir():
      storage_dir = default_storage_dir()
      filename = os.path.expanduser('~/.jupyter/nbconfig/notebook.json')
      if os.path.isfile(filename):
          with open(filename) as data_file:
              data = json.load(data_file)
              try:
                  if data["Comet"]["data_directory"]:
                      storage_dir = data["Comet"]["data_directory"]
              except:
                  pass
      if not os.path.exists(storage_dir):
          create_dir(storage_dir)
      return storage_dir
  
  def default_storage_dir():
      return os.path.expanduser('~/.jupyter/nbcomet')
  
  def create_dir(directory):
      try:
          os.makedirs(directory)
      except OSError:
          pass
  
  def was_saved_recently(version_dir, min_time=300):
      """ check if a previous version of the file has been saved recently
  
      version_dir: (str) dir to look for previous versions
      min_time: (int) minimum time in seconds allowed between saves """
  
      versions = [f for f in os.listdir(version_dir)
          if os.path.isfile(os.path.join(version_dir, f))
          and f[-6:] == '.ipynb']
      if len(versions) > 0:
          vdir, vname = os.path.split(versions[-1])
          vname, vext = os.path.splitext(vname)
          last_time_saved = datetime.datetime.strptime(vname[-26:],
              "%Y-%m-%d-%H-%M-%S-%f")
          delta = (datetime.datetime.now() - last_time_saved).seconds
          return delta <= min_time
      else:
          return False
  
  def hash_path(path):
      h = sha1(path.encode())
      return h.hexdigest()[0:8] #only need first 8 chars to be uniquely identified
  
subject: change version saving interval to 5min by default