Add support for redactions. Fixes #19

ui/messages/parser.go

@@ -69,6 +69,9 @@ func directParseEvent(matrix ifc.MatrixContainer, room *rooms.Room, evt *mautrix
 	if member != nil {
 		displayname = member.Displayname
 	}
+	if evt.Unsigned.RedactedBecause != nil || evt.Type == mautrix.EventRedaction {
+		return NewRedactedMessage(evt, displayname)
+	}
 	switch evt.Type {
 	case mautrix.EventSticker:
 		evt.Content.MsgType = mautrix.MsgImage

ui/messages/redactedmessage.go

@@ -0,0 +1,68 @@
+// gomuks - A terminal Matrix client written in Go.
+// Copyright (C) 2019 Tulir Asokan
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package messages
+
+import (
+	ifc "maunium.net/go/gomuks/interface"
+	"maunium.net/go/mautrix"
+	"maunium.net/go/mauview"
+	"maunium.net/go/tcell"
+
+	"maunium.net/go/gomuks/config"
+)
+
+type RedactedMessage struct{}
+
+func NewRedactedMessage(event *mautrix.Event, displayname string) *UIMessage {
+	return newUIMessage(event, displayname, &RedactedMessage{})
+}
+
+func (msg *RedactedMessage) Clone() MessageRenderer {
+	return &RedactedMessage{}
+}
+
+func (msg *RedactedMessage) NotificationContent() string {
+	return ""
+}
+
+func (msg *RedactedMessage) PlainText() string {
+	return "[redacted]"
+}
+
+func (msg *RedactedMessage) String() string {
+	return "&messages.RedactedMessage{}"
+}
+
+func (msg *RedactedMessage) CalculateBuffer(prefs config.UserPreferences, width int, uiMsg *UIMessage) {
+}
+
+func (msg *RedactedMessage) Height() int {
+	return 1
+}
+
+const RedactionChar = '█'
+const RedactionMaxWidth = 40
+var RedactionStyle = tcell.StyleDefault.Foreground(tcell.NewRGBColor(50, 0, 0))
+
+func (msg *RedactedMessage) Draw(screen mauview.Screen) {
+	w, _ := screen.Size()
+	for x := 0; x < w && x < RedactionMaxWidth; x++ {
+		screen.SetContent(x, 0, RedactionChar, nil, RedactionStyle)
+	}
+}
+
+func (msg *RedactedMessage) RegisterMatrix(matrix ifc.MatrixContainer) {}