fuse fuzzy user search

packages/app/src/FuzzySearch.ts

@@ -0,0 +1,43 @@
+import Fuse from "fuse.js";
+import { socialGraphInstance } from "@snort/system";
+import { System } from ".";
+
+export type FuzzySearchResult = {
+  pubkey: string;
+  name?: string;
+  username?: string;
+  nip05?: string;
+};
+
+export const fuzzySearch = new Fuse<FuzzySearchResult>([], {
+  keys: ["name", "username", { name: "nip05", weight: 0.5 }],
+  threshold: 0.3,
+  // sortFn here?
+});
+
+const profileTimestamps = new Map<string, number>(); // is this somewhere in cache?
+
+System.on("event", ev => {
+  if (ev.kind === 0) {
+    const existing = profileTimestamps.get(ev.pubkey);
+    if (existing) {
+      if (existing > ev.created_at) {
+        return;
+      }
+      fuzzySearch.remove(doc => doc.pubkey === ev.pubkey);
+    }
+    profileTimestamps.set(ev.pubkey, ev.created_at);
+    try {
+      const data = JSON.parse(ev.content);
+      if (ev.pubkey && (data.name || data.username || data.nip05)) {
+        data.pubkey = ev.pubkey;
+        fuzzySearch.add(data);
+      }
+    } catch (e) {
+      console.error(e);
+    }
+  }
+  if (ev.kind === 3) {
+    socialGraphInstance.handleFollowEvent(ev);
+  }
+});