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Insert <link rel="canonical"> elements (#1140)

Browse Source 
This prevents duplicate search results in case copies of the material is
being left visible on the web. See the Search Central
documentation[1] for details.

The implementation here should mostly go away when
https://github.com/google/mdbook-i18n-helpers/issues/70 is implemented.

[1]: https://developers.google.com/search/docs/crawling-indexing/consolidate-duplicate-urls
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Martin Geisler 2023-08-30 22:28:34 +02:00 committed by GitHub
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theme/index.hbs
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@ -142,6 +142,33 @@
}
</script>
{{! Move to template code after fixing this issue:
https://github.com/google/mdbook-i18n-helpers/issues/70 }}
<script>
(function () {
// See these pages for details:
// https://developers.google.com/search/docs/crawling-indexing/consolidate-duplicate-urls
// https://developers.google.com/search/docs/crawling-indexing/javascript/javascript-seo-basics
let base = "https://google.github.io/comprehensive-rust";
{{#if (eq language "en")}}
let canonical_href = `${base}/{{ path }}`;
{{else}}
let canonical_href = `${base}/{{ language }}/{{ path }}`;
{{/if}}
// mdbook gives us a string ending in ".md", we replace it with ".html":
canonical_href = canonical_href.slice(0, -"md".length) + "html";
if (canonical_href.endsWith("/index.html")) {
canonical_href = canonical_href.slice(0, -"index.html".length);
}
let link = document.createElement("link");
link.rel = "canonical";
link.href = canonical_href;
document.head.appendChild(link);
})()
</script>
<div id="page-wrapper" class="page-wrapper">
<div class="page">