SendTracked returns a string id for a send message, and Update can be used to change that message

message/matrix.go

@@ -87,6 +87,7 @@ func (m *Matrix) Receive() ([]Message, error) {
 	logtr.Debugf("%s => {Start:%s End:%v};; %v, (%d)", m.Continuation(), result.Start, result.End, err, len(result.Chunk))
 	m.continuation = result.End
 	for _, event := range result.Chunk {
+		logtr.Verbosef("matrix event: %+v", event)
 		if _, ok := matrixIDs[event.Sender]; !ok {
 			continue
 		}
@@ -124,19 +125,65 @@ func (m *Matrix) Receive() ([]Message, error) {
 	return messages, nil
 }
 
-func (m Matrix) Send(text string) error {
+func (m Matrix) Update(id, text string) error {
 	if m.mock {
-		logtr.Infof("matrix.Send(%s)", text)
+		logtr.Infof("matrix.Update(%s)", text)
 		return nil
 	}
 	c, err := m.getclient()
 	if err != nil {
 		return err
 	}
-	_, err = c.SendText(m.room, text)
+	type MRelatesTo struct {
+		EventID string `json:"event_id"`
+		RelType string `json:"rel_type"`
+	}
+	type NewContent struct {
+		Body    string `json:"body"`
+		MsgType string `json:"msgtype"`
+	}
+	type RelatesToRoomMessage struct {
+		Body        string     `json:"body"`
+		MsgType     string     `json:"msgtype"`
+		MRelatesTo  MRelatesTo `json:"m.relates_to"`
+		MNewContent NewContent `json:"m.new_content"`
+	}
+	_, err = c.SendMessageEvent(m.room, "m.room.message", RelatesToRoomMessage{
+		Body:    "",
+		MsgType: "m.text",
+		MNewContent: NewContent{
+			Body:    text,
+			MsgType: "m.text",
+		},
+		MRelatesTo: MRelatesTo{
+			EventID: id,
+			RelType: "m.replace",
+		},
+	})
 	return err
 }
 
+func (m Matrix) Send(text string) error {
+	_, err := m.SendTracked(text)
+	return err
+}
+
+func (m Matrix) SendTracked(text string) (string, error) {
+	if m.mock {
+		logtr.Infof("matrix.SendTracked(%s)", text)
+		return "", nil
+	}
+	c, err := m.getclient()
+	if err != nil {
+		return "", err
+	}
+	resp, err := c.SendText(m.room, text)
+	if err != nil {
+		return "", err
+	}
+	return resp.EventID, nil
+}
+
 func (m Matrix) SendImage(uri string) error {
 	if m.mock {
 		logtr.Infof("matrix.SendImage(%s)", uri)