fix: fixup breaking changes for book compilation

Author: simonsan

book.toml

@@ -16,17 +16,18 @@ after = ["links"]
 edition = "2021"
 
 [output.html]
+smart-punctuation = true
 default-theme = "rust"
 site-url = "/patterns/"
 git-repository-url = "https://github.com/rust-unofficial/patterns"
-git-repository-icon = "fa-github"
 edit-url-template = "https://github.com/rust-unofficial/patterns/edit/main/{path}"
 additional-css = [
   "./theme/css/language-picker.css",
   "./styles/last-changed.css",
 ]
 
 [preprocessor.last-changed]
+optional = true
 command = "mdbook-last-changed"
 renderer = ["html"]
 

theme/head.hbs

@@ -1,26 +1,26 @@
 {{! Move to template code after fixing this issue:
-https://github.com/google/mdbook-i18n-helpers/issues/70 }}
+    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}}
+  (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);
-                }
+      // 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>
+      let link = document.createElement("link");
+      link.rel = "canonical";
+      link.href = canonical_href;
+      document.head.appendChild(link);
+  })()
+</script>