hexo-theme-volantis/scripts/helpers/structured-data/lib/breadcrumblist.js

Elegant and powerful theme for Hexo.

module.exports = (hexo, option) => {
  const { config, page } = hexo;

  const breadcrumb = {
    "@context": "http://schema.org",
    "@type": "BreadcrumbList",
    itemListElement: [
      {
        "@type": "ListItem",
        position: 1,
        item: {
          "@id": config.url + config.root,
          name: config.title,
        },
      },
    ],
  };

  if (hexo.is_category()) {
    let { category_dir, category_map: map } = config;
    if (!Array.isArray(map)) map = [];
    if (category_dir === "/") category_dir = "";
    if (category_dir.slice(-1) !== "/") category_dir += "/";
    const category_path =
      category_dir + (map[page.category] || page.category) + "/";

    breadcrumb.itemListElement.push({
      "@type": "ListItem",
      position: 2,
      item: {
        "@id": config.url + config.root + category_path,
        name: page.category,
      },
    });
  }

  if (hexo.is_tag()) {
    let { tag_dir, tag_map: map } = config;
    if (!Array.isArray(map)) map = [];
    if (tag_dir === "/") tag_dir = "";
    if (tag_dir.slice(-1) !== "/") tag_dir += "/";
    const tag_path = tag_dir + (map[page.tag] || page.tag) + "/";

    breadcrumb.itemListElement.push({
      "@type": "ListItem",
      position: 2,
      item: {
        "@id": config.url + config.root + tag_path,
        name: page.tag,
      },
    });
  }

  if (hexo.is_archive()) {
    let { archive_dir } = config;
    if (archive_dir.slice(-1) !== "/") archive_dir += "/";

    breadcrumb.itemListElement.push({
      "@type": "ListItem",
      position: 2,
      item: {
        "@id": config.url + config.root + archive_dir,
        name: "Archive",
      },
    });
    let timezone = config.timezone || "Asia/Shanghai";
    if (hexo.is_year()) {
      const dtf = new Intl.DateTimeFormat(config.language, {
        year: "numeric",
        timeZone: timezone,
      });
      breadcrumb.itemListElement.push({
        "@type": "ListItem",
        position: 3,
        item: {
          "@id": config.url + config.root + archive_dir + page.year + "/",
          name: dtf.format(new Date(page.year, 0, 1)),
        },
      });
    }

    if (hexo.is_month()) {
      const dtf = new Intl.DateTimeFormat(config.language, {
        month: "numeric",
        timeZone: timezone,
      });
      breadcrumb.itemListElement.push({
        "@type": "ListItem",
        position: 4,
        item: {
          "@id":
            config.url +
            config.root +
            archive_dir +
            page.year +
            "/" +
            page.month +
            "/",
          name: dtf.format(new Date(page.year, page.month - 1, 1)),
        },
      });
    }
  }

  if (hexo.is_post()) {
    page.categories.data.forEach((category) =>
      breadcrumb.itemListElement.push({
        "@type": "ListItem",
        position: 2,
        item: {
          "@id": config.url + config.root + category.path,
          name: category.name,
        },
      })
    );

    breadcrumb.itemListElement.push({
      "@type": "ListItem",
      position: 3,
      item: {
        "@id": config.url + config.root + page.path,
        name: page.title || page.seo_title,
      },
    });
  }

  if (hexo.is_page() && page.categories) {
    let temp = "/"
    for (let index = 0; index < page.categories.length; index++) {
      const cat = page.categories[index];
      temp = temp + cat + "/"
      breadcrumb.itemListElement.push({
        "@type": "ListItem",
        position: 2,
        item: {
          "@id": config.url + config.root + config.category_dir + temp,
          name: cat,
        },
      })
    }
    breadcrumb.itemListElement.push({
      "@type": "ListItem",
      position: 3,
      item: {
        "@id": config.url + config.root + page.path,
        name: page.title || page.seo_title,
      },
    });
  }

  return breadcrumb;
};