feat: mentions

src/utils.ts

@@ -1,8 +1,42 @@
-import { NostrEvent } from "@snort/system";
+import { NostrEvent, NostrPrefix, encodeTLV } from "@snort/system";
+import * as utils from "@noble/curves/abstract/utils";
+import { bech32 } from "@scure/base";
 
 export function findTag(e: NostrEvent | undefined, tag: string) {
-    const maybeTag = e?.tags.find(evTag => {
-        return evTag[0] === tag;
-    });
-    return maybeTag && maybeTag[1];
-}
+  const maybeTag = e?.tags.find((evTag) => {
+    return evTag[0] === tag;
+  });
+  return maybeTag && maybeTag[1];
+}
+
+/**
+ * Convert hex to bech32
+ */
+export function hexToBech32(hrp: string, hex?: string) {
+  if (typeof hex !== "string" || hex.length === 0 || hex.length % 2 !== 0) {
+    return "";
+  }
+
+  try {
+    if (
+      hrp === NostrPrefix.Note ||
+      hrp === NostrPrefix.PrivateKey ||
+      hrp === NostrPrefix.PublicKey
+    ) {
+      const buf = utils.hexToBytes(hex);
+      return bech32.encode(hrp, bech32.toWords(buf));
+    } else {
+      return encodeTLV(hrp as NostrPrefix, hex);
+    }
+  } catch (e) {
+    console.warn("Invalid hex", hex, e);
+    return "";
+  }
+}
+
+export function splitByUrl(str: string) {
+  const urlRegex =
+    /((?:http|ftp|https|nostr|web\+nostr|magnet):\/?\/?(?:[\w+?.\w+])+(?:[a-zA-Z0-9~!@#$%^&*()_\-=+\\/?.:;',]*)?(?:[-A-Za-z0-9+&@#/%=~()_|]))/i;
+
+  return str.split(urlRegex);
+}