Add /pad command to post an editor.xdc to a group

.gitignore

@@ -1,4 +1,5 @@
 *~
 dist/
 coverage-percent.out
-coverage.out
+coverage.out
+.idea/*

invitebot.go

@@ -40,10 +40,6 @@ func onBotInit(cli *botcli.BotCli, bot *deltachat.Bot, cmd *cobra.Command, args
 			if err != nil {
 				cli.Logger.Error(err)
 			}
-			err = bot.Rpc.SetConfig(accId, "delete_device_after", option.Some("1800"))
-			if err != nil {
-				cli.Logger.Error(err)
-			}
 		}
 	}
 }
@@ -56,6 +52,10 @@ func onNewMsg(bot *deltachat.Bot, accId deltachat.AccountId, msgId deltachat.Msg
 		return
 	}
 
+	if msg.SystemMessageType == deltachat.SysmsgMemberAddedToGroup {
+		resendPads(bot.Rpc, accId, msg.ChatId)
+	}
+
 	if !msg.IsBot && !msg.IsInfo && msg.FromId > deltachat.ContactLastSpecial {
 		chat, err := bot.Rpc.GetBasicChatInfo(accId, msg.ChatId)
 		if err != nil {
@@ -81,6 +81,8 @@ func onNewMsg(bot *deltachat.Bot, accId deltachat.AccountId, msgId deltachat.Msg
 					logger.Error(err)
 				}
 			}
+		case "/pad":
+			sendPad(bot.Rpc, accId, msg.ChatId, msg.Text)
 		case "/help":
 			sendHelp(bot.Rpc, accId, msg.ChatId)
 		default:
@@ -98,13 +100,44 @@ func onNewMsg(bot *deltachat.Bot, accId deltachat.AccountId, msgId deltachat.Msg
 	}
 }
 
+func sendPad(rpc *deltachat.Rpc, accId deltachat.AccountId, chatId deltachat.ChatId, command string) {
+	description := command[5:] // bot adds text after /pad as description to the editor.xdc message
+	editor_path := "editor.xdc"
+	_, err := rpc.SendMsg(accId, chatId, deltachat.MsgData{Text: description, File: editor_path})
+	if err != nil {
+		cli.GetLogger(accId).With("chat", chatId).Error(err)
+	}
+}
+
+func resendPads(rpc *deltachat.Rpc, accId deltachat.AccountId, chatId deltachat.ChatId) {
+	var toResend []deltachat.MsgId
+	selfAddr, err := rpc.GetConfig(accId, "addr")
+	if err == nil {
+		msgIds, _ := rpc.GetMessageIds(accId, chatId, false, false)
+		for _, id := range msgIds {
+			msg, _ := rpc.GetMessage(accId, id)
+			senderaddress := msg.Sender.Address
+			if senderaddress == selfAddr.Unwrap() && msg.WebxdcInfo != nil {
+				toResend = append(toResend, id)
+			}
+		}
+		err := rpc.ResendMessages(accId, toResend)
+		if err != nil {
+			cli.Logger.Error("Resending messages failed.")
+		}
+	}
+}
+
 func sendHelp(rpc *deltachat.Rpc, accId deltachat.AccountId, chatId deltachat.ChatId) {
 	text := "I am a bot that can help you invite friends to your private groups.\n\n"
 	text += "You can also share your own invitation QR with them so why would you need me?\n"
 	text += "If you share your QR, your friends will be able to join only when you are online, but since I am a bot I am always online!\n\n"
 	text += "To get the invitation QR of a group, add me to the group and send in the group:\n\n/invite\n\n"
 	text += "I will share the invitation QR, you can then send it to friends you want to invite.\n\n"
-	text += "If you want to revoque te invitation QR just remove me from the group"
+	text += "If you want to revoque te invitation QR just remove me from the group.\n\n"
+	text += "To create a new shared editor for the group, you can write:\n\n"
+	text += "/pad Shopping List for Friday's Example Party\n\n"
+	text += "I will send an editor to the group, which anyone can edit; and if new members are added, they will see it, too."
 	_, err := rpc.SendMsg(accId, chatId, deltachat.MsgData{Text: text})
 	if err != nil {
 		cli.GetLogger(accId).With("chat", chatId).Error(err)