Allow substitution of bot's nick in RunCommands (irc) (#1890)

* Allow substitution of bot's nick in RunCommands

* Tweak description of "{BOTNICK}"

Made the description of "{BOTNICK}" consistent with that of other keywords

bridge/irc/handlers.go

@@ -243,6 +243,7 @@ func (b *Birc) handlePrivMsg(client *girc.Client, event girc.Event) {
 
 func (b *Birc) handleRunCommands() {
 	for _, cmd := range b.GetStringSlice("RunCommands") {
+		cmd = strings.ReplaceAll(cmd, "{BOTNICK}", b.Nick)
 		if err := b.i.Cmd.SendRaw(cmd); err != nil {
 			b.Log.Errorf("RunCommands %s failed: %s", cmd, err)
 		}

matterbridge.toml.sample

@@ -122,10 +122,11 @@ RejoinDelay=0
 #Only works in IRC right now.
 ColorNicks=false
 
-#RunCommands allows you to send RAW irc commands after connection
+#RunCommands allows you to send RAW irc commands after connection.
+#The string {BOTNICK} (case sensitive) will be replaced with the bot's current nickname.
 #Array of strings
 #OPTIONAL (default empty)
-RunCommands=["PRIVMSG user hello","PRIVMSG chanserv something"]
+RunCommands=["PRIVMSG user hello","PRIVMSG chanserv something", "MODE {BOTNICK} +B"]
 
 #PingDelay specifies how long to wait to send a ping to the irc server.
 #You can use s for second, m for minute