From 9127d1c420420b3c80414d8222840e96e4dd3f18 Mon Sep 17 00:00:00 2001
From: nsfisis <nsfisis@gmail.com>
Date: Sun, 26 Jan 2025 15:23:17 +0900
Subject: feat(blog/nuldoc): add `target=_blank` and `rel=noreferrer` to
 external links

---
 vhosts/blog/nuldoc-src/ndoc/to_html.ts | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

(limited to 'vhosts/blog/nuldoc-src/ndoc/to_html.ts')

diff --git a/vhosts/blog/nuldoc-src/ndoc/to_html.ts b/vhosts/blog/nuldoc-src/ndoc/to_html.ts
index ce55dbf9..bf556655 100644
--- a/vhosts/blog/nuldoc-src/ndoc/to_html.ts
+++ b/vhosts/blog/nuldoc-src/ndoc/to_html.ts
@@ -21,6 +21,7 @@ export default function toHtml(doc: Document): Document {
   transformSectionTitleElement(doc);
   transformCodeBlockElement(doc);
   transformNoteElement(doc);
+  addAttributesToExternalLinkElement(doc);
   setDefaultLangAttribute(doc);
   traverseFootnotes(doc);
   highlightPrograms(doc);
@@ -211,6 +212,22 @@ function transformNoteElement(doc: Document) {
   });
 }
 
+function addAttributesToExternalLinkElement(doc: Document) {
+  forEachChildRecursively(doc.root, (n) => {
+    if (n.kind !== "element" || n.name !== "a") {
+      return;
+    }
+
+    const href = n.attributes.get("href") ?? "";
+    if (!href.startsWith("http")) {
+      return;
+    }
+    n.attributes
+      .set("target", "_blank")
+      .set("rel", "noreferrer");
+  });
+}
+
 function setDefaultLangAttribute(_doc: Document) {
   // TODO
   // if (!e.attributes.has("lang")) {
-- 
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