Update theme

veryl-lang · Mar 6, 2024 · 8899a61 · 8899a61
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commit 8899a61
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Showing 2 changed files with 39 additions and 18 deletions.
diff --git a/book/theme/head.hbs b/book/theme/head.hbs
@@ -0,0 +1,39 @@
+<!-- Google tag (gtag.js) -->
+<script async src="https://www.googletagmanager.com/gtag/js?id=G-NXW2P6CCF3"></script>
+<script>
+    window.dataLayer = window.dataLayer || [];
+    function gtag(){dataLayer.push(arguments);}
+    gtag('js', new Date());
+
+    gtag('config', 'G-NXW2P6CCF3');
+</script>
+
+<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://doc.veryl-lang.org/book";
+        {{#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>
+
+<meta property="og:url" content="https://github.com/veryl-lang/veryl" />
+<meta property="og:title" content="Veryl: A Modern Hardware Description Language" />
+<meta property="og:description" content="Veryl is a hardware description language which is designed as a SystemVerilog alternative." />
+<meta property="og:image" content="https://github.com/veryl-lang/veryl/raw/master/support/logo/veryl_ogp.png" />
diff --git a/book/theme/index.hbs b/book/theme/index.hbs
@@ -1,19 +1,6 @@
 <!DOCTYPE HTML>
 <html lang="{{ language }}" class="{{ default_theme }}" dir="{{ text_direction }}">
     <head prefix="og: http://ogp.me/ns#">
-        <!-- Google tag (gtag.js) -->
-        <script async src="https://www.googletagmanager.com/gtag/js?id=G-NXW2P6CCF3"></script>
-        <script>
-            window.dataLayer = window.dataLayer || [];
-            function gtag(){dataLayer.push(arguments);}
-            gtag('js', new Date());
-
-            gtag('config', 'G-NXW2P6CCF3');
-        </script>
-
-        <link rel="alternate" hreflang="en" href="https://doc.veryl-lang.org/book/" />
-        <link rel="alternate" hreflang="ja" href="https://doc.veryl-lang.org/book/ja/" />
-
         <!-- Book generated using mdBook -->
         <meta charset="UTF-8">
         <title>{{ title }}</title>
@@ -32,11 +19,6 @@
         <meta name="viewport" content="width=device-width, initial-scale=1">
         <meta name="theme-color" content="#ffffff">
 
-        <meta property="og:url" content="https://github.com/veryl-lang/veryl" />
-        <meta property="og:title" content="Veryl: A Modern Hardware Description Language" />
-        <meta property="og:description" content="Veryl is a hardware description language which is designed as a SystemVerilog alternative." />
-        <meta property="og:image" content="https://github.com/veryl-lang/veryl/raw/master/support/logo/veryl_ogp.png" />
-
         {{#if favicon_svg}}
         <link rel="icon" href="{{ path_to_root }}favicon.svg">
         {{/if}}