From c829e436e46ace700045eaaf31bc4abf286e1156 Mon Sep 17 00:00:00 2001
From: Tulir Asokan <tulir@maunium.net>
Date: Sun, 1 Mar 2020 22:35:21 +0200
Subject: Implement sending redactions

---
 interface/matrix.go |  1 +
 matrix/matrix.go    |  8 +++++++-
 ui/commands.go      |  5 +----
 ui/room-view.go     | 17 ++++++++++++++++-
 4 files changed, 25 insertions(+), 6 deletions(-)

diff --git a/interface/matrix.go b/interface/matrix.go
index 34e8dda..6814f07 100644
--- a/interface/matrix.go
+++ b/interface/matrix.go
@@ -42,6 +42,7 @@ type MatrixContainer interface {
 	SendPreferencesToMatrix()
 	PrepareMarkdownMessage(roomID string, msgtype mautrix.MessageType, message string, relation *Relation) *event.Event
 	SendEvent(evt *event.Event) (string, error)
+	Redact(roomID, eventID, reason string) error
 	SendTyping(roomID string, typing bool)
 	MarkRead(roomID, eventID string)
 	JoinRoom(roomID, server string) (*rooms.Room, error)
diff --git a/matrix/matrix.go b/matrix/matrix.go
index 8cf2e96..4408ac5 100644
--- a/matrix/matrix.go
+++ b/matrix/matrix.go
@@ -768,7 +768,13 @@ func (c *Container) PrepareMarkdownMessage(roomID string, msgtype mautrix.Messag
 	return localEcho
 }
 
-// SendMarkdownMessage sends a message with the given markdown text to the given room.
+func (c *Container) Redact(roomID, eventID, reason string) error {
+	defer debug.Recover()
+	_, err := c.client.RedactEvent(roomID, eventID, mautrix.ReqRedact{Reason: reason})
+	return err
+}
+
+// SendMessage sends the given event.
 func (c *Container) SendEvent(event *event.Event) (string, error) {
 	defer debug.Recover()
 
diff --git a/ui/commands.go b/ui/commands.go
index 9ef0577..879aca7 100644
--- a/ui/commands.go
+++ b/ui/commands.go
@@ -151,10 +151,7 @@ func cmdReply(cmd *Command) {
 }
 
 func cmdRedact(cmd *Command) {
-	cmd.Reply("Not yet implemented 3:")
-
-	// This needs to be implemented in RoomView's OnSelect method
-	//cmd.Room.StartSelecting(SelectRedact, "")
+	cmd.Room.StartSelecting(SelectRedact, strings.Join(cmd.Args, " "))
 }
 
 func cmdReact(cmd *Command) {
diff --git a/ui/room-view.go b/ui/room-view.go
index 0e728a3..11b4508 100644
--- a/ui/room-view.go
+++ b/ui/room-view.go
@@ -190,7 +190,7 @@ func (view *RoomView) OnSelect(message *messages.UIMessage) {
 	case SelectReact:
 		go view.SendReaction(message.EventID, view.selectContent)
 	case SelectRedact:
-		// TODO redact
+		go view.Redact(message.EventID, view.selectContent)
 	}
 	view.selecting = false
 	view.selectContent = ""
@@ -580,6 +580,21 @@ func (view *RoomView) InputSubmit(text string) {
 	view.SetInputText("")
 }
 
+func (view *RoomView) Redact(eventID, reason string) {
+	defer debug.Recover()
+	err := view.parent.matrix.Redact(view.Room.ID, eventID, reason)
+	if err != nil {
+		if httpErr, ok := err.(mautrix.HTTPError); ok {
+			err = httpErr
+			if respErr := httpErr.RespError; respErr != nil {
+				err = respErr
+			}
+		}
+		view.AddServiceMessage(fmt.Sprintf("Failed to redact message: %v", err))
+		view.parent.parent.Render()
+	}
+}
+
 func (view *RoomView) SendReaction(eventID string, reaction string) {
 	defer debug.Recover()
 	debug.Print("Reacting to", eventID, "in", view.Room.ID, "with", reaction)
-- 
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