docs: def just_smart_bibtools(bib_style, aux, bib):
      """Tectonic has taken over most of the features that this tool used to provide,
      but here's a hack to keep my smart .bib file generation working.
  
      """
      extradir = Path('.bibtex')
      extradir.ensure_dir(parents=True)
  
      bib_export(bib_style, aux, extradir / 'ZZ_bibtools.bib',
                 no_tool_ok=True, quiet=True, ignore_missing=True)
      merge_bibtex_with_aux(aux, bib, extradir)