feat(boards2): change public delete reply function to soft delete replies

examples/gno.land/r/demo/boards2/post.gno

@@ -148,6 +148,10 @@ func (post *Post) Update(title string, body string) {
 	post.updatedAt = time.Now()
 }
 
+func (post *Post) HasReplies() bool {
+	return post.replies.Size() > 0
+}
+
 func (thread *Post) GetReply(pid PostID) (_ *Post, found bool) {
 	v, found := thread.repliesAll.Get(pid.Key())
 	if !found {

examples/gno.land/r/demo/boards2/post_test.gno

@@ -140,6 +140,7 @@ func TestNewThread(t *testing.T) {
 	uassert.True(t, thread.GetUpdatedAt().IsZero())
 	uassert.Equal(t, title, thread.GetTitle())
 	uassert.Equal(t, body[:77]+"...", thread.GetSummary())
+	uassert.False(t, thread.HasReplies())
 	uassert.Equal(t, url, thread.GetURL())
 	uassert.Equal(t, replyURL, thread.GetReplyFormURL())
 	uassert.Equal(t, repostURL, thread.GetRepostFormURL())
@@ -160,6 +161,7 @@ func TestThreadAddReply(t *testing.T) {
 	uassert.Equal(t, threadID+1, uint(reply.GetPostID()))
 	uassert.Equal(t, reply.GetCreator(), replier)
 	uassert.Equal(t, reply.GetBody(), body)
+	uassert.True(t, thread.HasReplies())
 }
 
 func TestThreadGetReply(t *testing.T) {
@@ -297,6 +299,7 @@ func TestNewReply(t *testing.T) {
 	uassert.Equal(t, uint(replyID), uint(reply.GetPostID()))
 	uassert.False(t, reply.GetCreatedAt().IsZero())
 	uassert.True(t, reply.GetUpdatedAt().IsZero())
+	uassert.False(t, reply.HasReplies())
 	uassert.Equal(t, body[:77]+"...", reply.GetSummary())
 	uassert.Equal(t, url, reply.GetURL())
 	uassert.Equal(t, replyURL, reply.GetReplyFormURL())
@@ -320,6 +323,8 @@ func TestReplyAddReply(t *testing.T) {
 	uassert.Equal(t, parentReplyID+1, uint(reply.GetPostID()))
 	uassert.Equal(t, reply.GetCreator(), replier)
 	uassert.Equal(t, reply.GetBody(), body)
+	uassert.False(t, reply.HasReplies())
+	uassert.True(t, parentReply.HasReplies())
 }
 
 func TestReplyGetReply(t *testing.T) {

examples/gno.land/r/demo/boards2/public.gno

@@ -174,18 +174,21 @@ func DeleteReply(bid BoardID, threadID, replyID PostID) {
 
 	board := mustGetBoard(bid)
 	thread := mustGetThread(board, threadID)
-	assertReplyExists(thread, replyID)
-
-	// TODO: Hide reply when the caller is the owner of the reply without permission
-	// TODO: Support removing reply and children though proposals?
+	reply := mustGetReply(thread, replyID)
+	assertReplyVisible(reply)
 
 	caller := std.GetOrigCaller()
-	args := Args{bid, threadID, replyID}
-	gPerm.WithPermission(caller, PermissionReplyDelete, args, func(a Args) {
-		board := mustGetBoard(bid)
-		thread := mustGetThread(board, threadID)
+	if caller != reply.GetCreator() {
+		assertHasBoardPermission(board, caller, PermissionReplyDelete)
+	}
+
+	// Soft delete reply by changing its body when it contains
+	// sub-replies, otherwise hard delete it.
+	if reply.HasReplies() {
+		reply.Update(reply.GetTitle(), "this reply has been deleted")
+	} else {
 		thread.DeleteReply(replyID)
-	})
+	}
 }
 
 func EditThread(bid BoardID, threadID PostID, title, body string) {