Remove Giscus from search page (#8777)

_static/js/custom.js

@@ -238,6 +238,65 @@ const registerSidebarObserver = (function(){
   };
 })();
 
+/**
+ * Registers Giscus if there's an #godot-giscus container.
+ * @returns {void} Nothing.
+ */
+const registerGiscus = function () {
+  const giscusContainer = document.getElementById("godot-giscus");
+  if (giscusContainer == null) {
+    return;
+  }
+
+  const removeGiscusContainer = function() {
+    giscusContainer.remove();
+  };
+
+  const pageNameMetaElement = Array.from(document.head.querySelectorAll("meta")).find((meta) => meta.name === "doc_pagename");
+  if (pageNameMetaElement == null) {
+    removeGiscusContainer();
+    return;
+  }
+
+  const pageNameDenyList = [
+    "search"
+  ];
+  if (pageNameDenyList.includes(pageNameMetaElement.content)) {
+    removeGiscusContainer();
+    return;
+  }
+
+  // Use https://giscus.app/ to regenerate the script tag if needed.
+  // data-term is set to be language-independent and version-independent, so that comments can be centralized for each page.
+  // This increases the likelihood that users will encounter comments on less frequently visited pages.
+  const scriptElement = document.createElement("script");
+  scriptElement.src = "https://giscus.app/client.js";
+  scriptElement.crossOrigin = "anonymous";
+  scriptElement.async = true;
+
+  const dataset = {
+    repo: "godotengine/godot-docs-user-notes",
+    repoId: "R_kgDOKuNx0w",
+    category: "User-contributed notes",
+    categoryId: "DIC_kwDOKuNx084CbANb",
+    mapping: "specific",
+    term: pageNameMetaElement.content,
+    strict: "1",
+    reactionsEnabled: "0",
+    emitMetadata: "0",
+    inputPosition: "bottom",
+    theme: "preferred_color_scheme",
+    lang: "en",
+    loading: "lazy",
+  };
+
+  for (const [key, value] of Object.entries(dataset)) {
+    scriptElement.dataset[key] = value;
+  }
+
+  giscusContainer.append(scriptElement);
+};
+
 $(document).ready(() => {
   // Remove the search match highlights from the page, and adjust the URL in the
   // navigation history.
@@ -425,6 +484,9 @@ $(document).ready(() => {
 
     registerOnScrollEvent(mediaQuery);
   }
+
+  // Giscus
+  registerGiscus();
 });
 
 // Override the default implementation from doctools.js to avoid this behavior.