docs(hugo): add algolia docsearch

docs/hugo.yaml

@@ -21,7 +21,7 @@ params:
   BookTheme: auto
   BookRepo: https://github.com/iyear/tdl
   BookSection: "*"
-  BookSearch: false
+  BookSearch: true # container will be mounted by docsearch
   BookEditPath: edit/master/docs
   BookCommitPath: commit
   BookDateFormat: 2006/01/02

docs/layouts/partials/docs/inject/footer.html

@@ -38,3 +38,56 @@
         enumerable: true
     });
 </script>
+
+<!--Algolia DocSearch-->
+<style>
+    .DocSearch-Button {
+        border: 0;
+        border-radius: 4px;
+        font-weight: 200;
+        height: 30px;
+        margin: 0 0 0 0;
+        padding: 0 2px;
+        width: 100%;
+        color: #7B7B7B;
+    }
+
+    .DocSearch-Button:hover,
+    .DocSearch-Button:active,
+    .DocSearch-Button:focus {
+        background: rgb(235, 237, 240);
+        color: #7B7B7B;
+        box-shadow: inset 0 0 0 2px #646464;
+        transition: background 0.15s, color 0.15s, box-shadow 0.15s;
+    }
+
+    .DocSearch-Search-Icon {
+        stroke-width: 1.4;
+        width: 20px;
+        padding-left: 5px;
+    }
+    .DocSearch-Button .DocSearch-Search-Icon {
+        color: #7B7B7B;
+    }
+
+    .DocSearch-Button-Placeholder {
+        font-size: 0.9rem;
+        padding-left: 5px;
+        padding-top: 1px;
+    }
+
+    .DocSearch-Button-Keys {
+        display: none;
+    }
+</style>
+<script src="https://cdn.jsdelivr.net/npm/@docsearch/js@3"></script>
+<script type="text/javascript">
+    docsearch({
+        appId: "BUITIDR2R4",
+        apiKey: "010cbf192910433ce5b7470ca74dfd70",
+        indexName: "iyear",
+        container: ".book-search", // mount on original hugo-book search
+        debug: false,
+        insights: true,
+    });
+</script>

docs/layouts/partials/docs/inject/head.html

@@ -1,9 +1,10 @@
 <script>
     var _hmt = _hmt || [];
-    (function() {
+    (function () {
         var hm = document.createElement("script");
         hm.src = "https://hm.baidu.com/hm.js?937728d191a48974ef10543f8020d8f5";
         var s = document.getElementsByTagName("script")[0];
         s.parentNode.insertBefore(hm, s);
     })();
 </script>
+<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@docsearch/css@3"/>