From cd4c9b194fe486bcea08c1b9166e1ac22508ab00 Mon Sep 17 00:00:00 2001
From: Wim <wim@42.be>
Date: Mon, 20 Nov 2017 23:27:27 +0100
Subject: [PATCH] Add support for ReplaceNicks using regexp to replace nicks.
 Closes #269

---
 bridge/config/config.go | 13 +++++++------
 gateway/gateway.go      | 14 ++++++++++++++
 2 files changed, 21 insertions(+), 6 deletions(-)

diff --git a/bridge/config/config.go b/bridge/config/config.go
index f26e60bb..afb9f1a0 100644
--- a/bridge/config/config.go
+++ b/bridge/config/config.go
@@ -59,6 +59,10 @@ type Protocol struct {
 	IgnoreMessages         string     // all protocols
 	Jid                    string     // xmpp
 	Login                  string     // mattermost, matrix
+	MessageQueue           int        // IRC, size of message queue for flood control
+	MessageDelay           int        // IRC, time in millisecond to wait between messages
+	MessageLength          int        // IRC, max length of a message allowed
+	MessageFormat          string     // telegram
 	Muc                    string     // xmpp
 	Name                   string     // all protocols
 	Nick                   string     // all protocols
@@ -71,12 +75,9 @@ type Protocol struct {
 	NoTLS                  bool       // mattermost
 	Password               string     // IRC,mattermost,XMPP,matrix
 	PrefixMessagesWithNick bool       // mattemost, slack
-	Protocol               string     //all protocols
-	ReplaceMessages        [][]string // all messages
-	MessageQueue           int        // IRC, size of message queue for flood control
-	MessageDelay           int        // IRC, time in millisecond to wait between messages
-	MessageLength          int        // IRC, max length of a message allowed
-	MessageFormat          string     // telegram
+	Protocol               string     // all protocols
+	ReplaceMessages        [][]string // all protocols
+	ReplaceNicks           [][]string // all protocols
 	RemoteNickFormat       string     // all protocols
 	Server                 string     // IRC,mattermost,XMPP,discord
 	ShowJoinPart           bool       // all protocols
diff --git a/gateway/gateway.go b/gateway/gateway.go
index 8a0a666f..be03a99b 100644
--- a/gateway/gateway.go
+++ b/gateway/gateway.go
@@ -254,6 +254,20 @@ func (gw *Gateway) modifyUsername(msg config.Message, dest *bridge.Bridge) strin
 	if nick == "" {
 		nick = gw.Config.General.RemoteNickFormat
 	}
+
+	// loop to replace nicks
+	for _, outer := range br.Config.ReplaceNicks {
+		search := outer[0]
+		replace := outer[1]
+		// TODO move compile to bridge init somewhere
+		re, err := regexp.Compile(search)
+		if err != nil {
+			log.Errorf("regexp in %s failed: %s", msg.Account, err)
+			break
+		}
+		msg.Username = re.ReplaceAllString(msg.Username, replace)
+	}
+
 	if len(msg.Username) > 0 {
 		// fix utf-8 issue #193
 		i := 0