code: def _get_page_meta(self, page):
          
          meta = self._pages_meta.get(page)
          if not meta:
              src_file = os.path.join(self.pages_dir, page)
              with open(src_file) as f:
                  _, _ext = os.path.splitext(src_file)
                  markup = _ext.replace(".", "")
                  _meta, _ = frontmatter.parse(f.read())
                  meta = self.default_page_meta.copy()
                  meta["meta"].update(self.config.get("site.meta", {}))
                  meta.update(_meta)
                  dest_file, url = self._get_dest_file_and_url(page, meta)
                  meta["url"] = url
                  meta["filepath"] = dest_file
                  if meta.get("markup") is None:
                      meta["markup"] = markup
                  self._pages_meta[page] = meta
  
          return meta
docs: Cache the page meta from the frontmatter and assign new keys
          The cache data will be used to build links or other properties