Normalize forum URLs as nostr events and rendered them as titles

src/lib/linkify.ts

@@ -1,4 +1,5 @@
 import * as nip19 from "@nostr/tools/nip19";
+import { RELAY_URL } from "./config";
 
 // Curated TLD list: gTLDs, popular new gTLDs, common ccTLDs
 const TLDS = [
@@ -107,7 +108,14 @@ export type ChatToken =
   | { type: "text"; value: string }
   | { type: "link"; href: string; label: string }
   | { type: "mention"; pubkey: string; entity: string; fallback: string }
-  | { type: "entity"; entity: string; href: string; label: string };
+  | {
+      type: "entity";
+      entity: string;
+      href: string;
+      label: string;
+      // Underlying event id for note/nevent — used to resolve a forum thread.
+      id?: string;
+    };
 
 // Shorten a nostr entity to xxxxxxxx...xxxx
 export function shortNostrEntity(entity: string): string {
@@ -145,7 +153,15 @@ function decodeEntity(entity: string): ChatToken | null {
         entity,
         fallback: shortNostrEntity(entity),
       };
-    if (decoded.type === "note" || decoded.type === "nevent" || decoded.type === "naddr")
+    if (decoded.type === "note" || decoded.type === "nevent")
+      return {
+        type: "entity",
+        entity,
+        href: `https://njump.me/${entity}`,
+        label: shortNostrEntity(entity),
+        id: decoded.type === "note" ? decoded.data : decoded.data.id,
+      };
+    if (decoded.type === "naddr")
       return {
         type: "entity",
         entity,
@@ -193,3 +209,29 @@ export function tokenizeChat(content: string): ChatToken[] {
     out.push({ type: "text", value: content.slice(last) });
   return out;
 }
+
+function escapeRegExp(s: string): string {
+  return s.replace(/[.*+?^${}()|[\]\\]/g, "\\$&");
+}
+
+// Rewrite same-origin forum thread URLs into nostr entities before publishing,
+// so the reference is portable to other Nostr clients. A `#post-<id>` fragment
+// targets the reply (kind 1111); otherwise the thread itself (kind 11). The
+// author is omitted; the parent is recovered from the reply's own tags on read.
+export function convertForumUrls(content: string): string {
+  if (typeof window === "undefined") return content;
+  const re = new RegExp(
+    `${escapeRegExp(window.location.origin)}/thread/([0-9a-f]{64})\\/?(?:#post-([0-9a-f]{64}))?`,
+    "g",
+  );
+  return content.replace(re, (whole, threadId, replyId) => {
+    try {
+      const nevent = replyId
+        ? nip19.neventEncode({ id: replyId, kind: 1111, relays: [RELAY_URL] })
+        : nip19.neventEncode({ id: threadId, kind: 11, relays: [RELAY_URL] });
+      return `nostr:${nevent}`;
+    } catch {
+      return whole;
+    }
+  });
+}