patterns/theme/head.hbs

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{{! 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://rust-unofficial.github.io/patterns";
{{#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>