old_contents: """
  FLask-DotEnv
  
  :copyright: (c) 2015 by Yasuhiro Asaka.
  :license: BSD 2-Clause License
  """
  
  import os
  import re
  import warnings
  
  
  class DotEnv(object):
      """The .env file support for Flask."""
  
      def __init__(self, app=None):
          self.app = app
          self.verbose_mode = False
          if app is not None:
              self.init_app(app)
  
      def init_app(self, app, env_file=None, verbose_mode=False):
          if self.app is None:
              self.app = app
          self.verbose_mode = verbose_mode
  
          if env_file is None:
              env_file = os.path.join(os.getcwd(), ".env")
          if not os.path.exists(env_file):
              warnings.warn("can't read {0} - it doesn't exist".format(env_file))
          else:
              self.__import_vars(env_file)
  
      def __import_vars(self, env_file):
          with open(env_file, "r") as f:
              for line in f:
                  key, val = line.strip().split('=')
                  if not callable(val):
                      if self.verbose_mode:
                          if key in self.app.config:
                              msg = " * Overwriting an existing config var: {0}"
                          else:
                              msg = " * Setting an entirely new config var: {0}"
                          print(msg.format(key))
                      self.app.config[key] = re.sub(r"\A[\"']|[\"']\Z", "", val)
  
      def alias(self, maps):
          for k, v in maps.items():
              if self.verbose_mode:
                  print(
                      " * Mapping a specified var as a alias:"
                      " {0} => {1}".format(v, k)
                  )
              self.app.config[v] = self.app.config[k]
  
new_contents: """
  FLask-DotEnv
  
  :copyright: (c) 2015 by Yasuhiro Asaka.
  :license: BSD 2-Clause License
  """
  
  import os
  import re
  import warnings
  
  
  class DotEnv(object):
      """The .env file support for Flask."""
  
      def __init__(self, app=None):
          self.app = app
          self.verbose_mode = False
          if app is not None:
              self.init_app(app)
  
      def init_app(self, app, env_file=None, verbose_mode=False):
          if self.app is None:
              self.app = app
          self.verbose_mode = verbose_mode
  
          if env_file is None:
              env_file = os.path.join(os.getcwd(), ".env")
          if not os.path.exists(env_file):
              warnings.warn("can't read {0} - it doesn't exist".format(env_file))
          else:
              self.__import_vars(env_file)
  
      def __import_vars(self, env_file):
          with open(env_file, "r") as f:
              for line in f:
                  key, val = line.strip().split('=', 1)
                  if not callable(val):
                      if self.verbose_mode:
                          if key in self.app.config:
                              msg = " * Overwriting an existing config var: {0}"
                          else:
                              msg = " * Setting an entirely new config var: {0}"
                          print(msg.format(key))
                      self.app.config[key] = re.sub(r"\A[\"']|[\"']\Z", "", val)
  
      def alias(self, maps):
          for k, v in maps.items():
              if self.verbose_mode:
                  print(
                      " * Mapping a specified var as a alias:"
                      " {0} => {1}".format(v, k)
                  )
              self.app.config[v] = self.app.config[k]
  
subject: Split key-value pairs on first occurrence of "="