code: def render_workflow_html_template(filename, subtemplate, filelists, **kwargs):
      
  
      dirnam = os.path.dirname(filename)
      makedir(dirnam)
  
      try:
          filenames = [f.name for filelist in filelists for f in filelist if f is not None]
      except TypeError:
          filenames = []
  
      # render subtemplate
      subtemplate_dir = pycbc.results.__path__[0] + '/templates/wells'
      env = Environment(loader=FileSystemLoader(subtemplate_dir))
      env.globals.update(get_embedded_config=get_embedded_config)
      env.globals.update(path_exists=os.path.exists)
      env.globals.update(len=len)
      subtemplate = env.get_template(subtemplate)
      context = {'filelists' : filelists,
                 'dir' : dirnam}
      context.update(kwargs)
      output = subtemplate.render(context)
  
      # save as html page
      kwds = {'render-function' : 'render_tmplt',
              'filenames' : ','.join(filenames)}
      save_html_with_metadata(str(output), filename, None, kwds)
docs: Writes a template given inputs from the workflow generator. Takes
      a list of tuples. Each tuple is a pycbc File object. Also the name of the
      subtemplate to render and the filename of the output.