From 04549e79191a675c7fce0aa2369657ce9b06532b Mon Sep 17 00:00:00 2001
From: Shivaram Lingamneni <slingamn@cs.stanford.edu>
Date: Sun, 12 Apr 2020 22:38:39 -0400
Subject: [PATCH] fix #827

---
 irc/handlers.go | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/irc/handlers.go b/irc/handlers.go
index 5df1bb69..31d4eae6 100644
--- a/irc/handlers.go
+++ b/irc/handlers.go
@@ -2229,6 +2229,13 @@ func renameHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *Re
 		return false
 	}
 
+	config := server.Config()
+	status, _ := channel.historyStatus(config)
+	if status == HistoryPersistent {
+		rb.Add(nil, server.name, ERR_CANNOTRENAME, client.Nick(), oldName, newName, client.t("Channels with persistent history cannot be renamed"))
+		return false
+	}
+
 	// perform the channel rename
 	err := server.channels.Rename(oldName, newName)
 	if err == errInvalidChannelName {