text: from __future__ import unicode_literals
  
  import subprocess
  
  from .common import PostProcessor
  from ..compat import compat_shlex_quote
  from ..utils import (
      encodeArgument,
      PostProcessingError,
  )
  
  
  class ExecAfterDownloadPP(PostProcessor):
      PP_NAME = 'Exec'
  
      def __init__(self, downloader, exec_cmd):
          super(ExecAfterDownloadPP, self).__init__(downloader)
          self.exec_cmd = exec_cmd
  
      def run(self, information):
          cmd = self.exec_cmd
          if '{}' not in cmd:
              cmd += ' {}'
  
          cmd = cmd.replace('{}', compat_shlex_quote(information['filepath']))
  
          self.to_screen('Executing command: %s' % cmd)
          retCode = subprocess.call(encodeArgument(cmd), shell=True)
          if retCode != 0:
              raise PostProcessingError(
                  'Command returned error code %d' % retCode)
  
          return [], information
  