code: def tearpage(filename, bibtex=None, force=None):
      
      # Fetch pages to tear
      pages_to_tear = []
      if force is not None:
          pages_to_tear = force
      elif bibtex is not None:
          pages_to_tear = tearpage_needed(bibtex)
  
      if len(pages_to_tear) > 0:
          # If tearing is needed, do it and return True
          tearpage_backend(filename, teared_pages=pages_to_tear)
          return True
  
      # Else, simply return False
      return False
docs: Tear some pages of the file if needed.
  
      :params filename: Path to the file to handle.
      :params bibtex: BibTeX dict associated to this file, as the one given by \
              ``bibtexparser``. (Mandatory if force is not specified)
      :params force: If a list of integers, force the tearing of the \
              specified pages. (Optional)
      :returns: A boolean indicating whether the file has been teared or not. \
              Side effect is tearing the necessary pages from the file.