Add channel variable for templating

Signed-off-by: Knut Ahlers <knut@ahlers.me>

msgformatter.go

@@ -71,6 +71,10 @@ func formatMessage(tplString string, m *irc.Message, r *rule, fields map[string]
 	fields["permitTimeout"] = int64(*&config.PermitTimeout / time.Second)
 	fields["username"] = m.User
 
+	if m.Command == "PRIVMSG" && len(m.Params) > 0 {
+		fields["channel"] = m.Params[0]
+	}
+
 	buf := new(bytes.Buffer)
 	err = tpl.Execute(buf, fields)
 

wiki/Home.md

@@ -60,6 +60,7 @@ rules: # See below for examples
 
 There are certain variables available in the strings with templating enabled:
 
+- `channel` - Channel the message was sent to, only available for regular messages not events
 - `msg` - The message object, used in functions, should not be sent to chat
 - `permitTimeout` - Value of `permit_timeout` in seconds
 - `username` - The username of the message author