Enable CJK search

Ref rust-lang/mdBook#2052

assets/elasticlunr.js

@@ -0,0 +1,28 @@
+/**
+ * @see https://github.com/allfunc/docker-mdbook
+ */
+window.elasticlunr.Index.load = (index) => {
+  const FzF = window.fzf.Fzf;
+  const storeDocs = index.documentStore.docs;
+  const indexArr = Object.keys(storeDocs);
+  const ofzf = new FzF(indexArr, {
+    selector: (item) => {
+      const res = storeDocs[item];
+      res.text = `${res.title}${res.breadcrumbs}${res.body}`;
+      return res.text;
+    },
+  });
+  return {
+    search: (searchterm) => {
+      const entries = ofzf.find(searchterm);
+      return entries.map((data) => {
+        const { item, score } = data;
+        return {
+          doc: storeDocs[item],
+          ref: item,
+          score,
+        };
+      });
+    },
+  };
+};

book.toml

@@ -8,3 +8,4 @@ title = "作って学ぶ正規表現エンジン"
 [output.html]
 git-repository-url = "https://github.com/makenowjust/kantan-regex-book"
 edit-url-template = "https://github.com/makenowjust/kantan-regex-book/edit/main/{path}"
+additional-js = ["assets/fzf.umd.js", "assets/elasticlunr.js"]