Add /add command

telegram/commands.go

@@ -334,6 +334,28 @@ func (c *Client) ProcessChatCommand(chatID int64, cmdline string) (string, bool)
 
 		text := regex.ReplaceAllString(messageText.Text.Text, strings.Join(args[1:], " "))
 		c.ProcessOutgoingMessage(chatID, text, message.Id, "")
+	// add @contact
+	case "add":
+		if len(args) < 1 {
+			return notEnoughArguments, true
+		}
+
+		chat, err := c.client.SearchPublicChat(&client.SearchPublicChatRequest{
+			Username: args[0],
+		})
+		if err != nil {
+			return err.Error(), true
+		}
+		if chat == nil {
+			return "No error, but chat is nil", true
+		}
+
+		gateway.SendPresence(
+			c.xmpp,
+			c.jid,
+			gateway.SPFrom(strconv.FormatInt(chat.Id, 10)),
+			gateway.SPType("subscribe"),
+		)
 	case "help":
 		return helpString(helpTypeChat), true
 	default: