refactor: streamline reply tag parsing

src/auto-reply/reply/reply-tags.ts

@@ -1,3 +1,13 @@
+const REPLY_TAG_RE =
+  /\[\[\s*(?:reply_to_current|reply_to\s*:\s*([^\]\n]+))\s*\]\]/gi;
+
+function normalizeReplyText(text: string) {
+  return text
+    .replace(/[ \t]+/g, " ")
+    .replace(/[ \t]*\n[ \t]*/g, "\n")
+    .trim();
+}
+
 export function extractReplyToTag(
   text?: string,
   currentMessageId?: string,
@@ -7,29 +17,28 @@ export function extractReplyToTag(
   hasTag: boolean;
 } {
   if (!text) return { cleaned: "", hasTag: false };
-  let cleaned = text;
-  let replyToId: string | undefined;
+
+  let sawCurrent = false;
+  let lastExplicitId: string | undefined;
   let hasTag = false;
 
-  const currentMatch = cleaned.match(/\[\[\s*reply_to_current\s*\]\]/i);
-  if (currentMatch) {
-    cleaned = cleaned.replace(/\[\[\s*reply_to_current\s*\]\]/gi, " ");
-    hasTag = true;
-    if (currentMessageId?.trim()) {
-      replyToId = currentMessageId.trim();
-    }
-  }
+  const cleaned = normalizeReplyText(
+    text.replace(REPLY_TAG_RE, (_full, idRaw: string | undefined) => {
+      hasTag = true;
+      if (idRaw === undefined) {
+        sawCurrent = true;
+        return " ";
+      }
 
-  const idMatch = cleaned.match(/\[\[\s*reply_to\s*:\s*([^\]\n]+)\s*\]\]/i);
-  if (idMatch?.[1]) {
-    cleaned = cleaned.replace(/\[\[\s*reply_to\s*:\s*[^\]\n]+\s*\]\]/gi, " ");
-    replyToId = idMatch[1].trim();
-    hasTag = true;
-  }
+      const id = idRaw.trim();
+      if (id) lastExplicitId = id;
+      return " ";
+    }),
+  );
+
+  const replyToId =
+    lastExplicitId ??
+    (sawCurrent ? currentMessageId?.trim() || undefined : undefined);
 
-  cleaned = cleaned
-    .replace(/[ \t]+/g, " ")
-    .replace(/[ \t]*\n[ \t]*/g, "\n")
-    .trim();
   return { cleaned, replyToId, hasTag };
 }