code: def apply_preprocessors(root, src, dst, processors):
      
      matches = [(pattern, cmds) for pattern, cmds in processors.iteritems() if fnmatch(src, pattern)]
      if not matches:
          return False
  
      params = get_format_params(dst)
  
      for pattern, cmd_list in matches:
          for cmd in cmd_list:
              run_command(cmd, root=root, dst=dst, input=src, params=params)
              src = dst
  
      return True
docs: Preprocessors operate based on the source filename, and apply to each
      file individually.