code: def minify(pelican):
      
      executable = pelican.settings.get('YUICOMPRESSOR_EXECUTABLE', 'yuicompressor')
      for dirpath, _, filenames in os.walk(pelican.settings['OUTPUT_PATH']):
          for name in filenames:
              if os.path.splitext(name)[1] in ('.css','.js'):
                  filepath = os.path.join(dirpath, name)
                  logger.info('minify %s', filepath)
                  check_call([executable, '--charset', 'utf-8', filepath, '-o', filepath])
docs: Minify CSS and JS with YUI Compressor
        :param pelican: The Pelican instance