old_contents: '''
  Clipboard xsel: an implementation of the Clipboard using xsel command line tool.
  '''
  
  __all__ = ('ClipboardXsel', )
  
  from kivy.utils import platform
  from kivy.core.clipboard import ClipboardBase
  
  if platform != 'linux':
      raise SystemError('unsupported platform for xsel clipboard')
  
  try:
      import subprocess
      p = subprocess.Popen(['xsel'], stdout=subprocess.PIPE)
      p.communicate()
  except:
      raise
  
  
  class ClipboardXsel(ClipboardBase):
  
      def get(self, mimetype='text/plain'):
          p = subprocess.Popen(['xsel', '-bo'], stdout=subprocess.PIPE)
          data, _ = p.communicate()
          return data
  
      def put(self, data, mimetype='text/plain'):
          p = subprocess.Popen(['xsel', '-bi'], stdin=subprocess.PIPE)
          p.communicate(data)
  
      def get_types(self):
          return list('text/plain',)
  
new_contents: '''
  Clipboard xsel: an implementation of the Clipboard using xsel command line tool.
  '''
  
  __all__ = ('ClipboardXsel', )
  
  from kivy.utils import platform
  from kivy.core.clipboard import ClipboardBase
  
  if platform != 'linux':
      raise SystemError('unsupported platform for xsel clipboard')
  
  try:
      import subprocess
      p = subprocess.Popen(['xsel'], stdout=subprocess.PIPE)
      p.communicate()
  except:
      raise
  
  
  class ClipboardXsel(ClipboardBase):
  
      def get(self, mimetype='text/plain'):
          p = subprocess.Popen(['xsel', '-bo'], stdout=subprocess.PIPE)
          data, _ = p.communicate()
          return data
  
      def put(self, data, mimetype='text/plain'):
          p = subprocess.Popen(['xsel', '-bi'], stdin=subprocess.PIPE)
          p.communicate(data)
  
      def get_types(self):
          return [u'text/plain']
  
subject: Fix return get_types for ClipboardXsel