Post Discord questions as named threads.

internal/discord/api.go

@@ -9,7 +9,7 @@ import (
 // API is the Discord REST surface used by the outbound subscriber.
 type API interface {
 	SendToChannel(ctx context.Context, channelID string, msg Message) (messageID string, err error)
-	StartThread(ctx context.Context, channelID, messageID, name string) (threadID string, err error)
+	StartThread(ctx context.Context, channelID, name string) (threadID string, err error)
 	SendToThread(ctx context.Context, threadID string, msg Message) (messageID string, err error)
 	Edit(ctx context.Context, channelID, messageID string, msg Message) error
 	Close() error
@@ -27,9 +27,10 @@ func (s *sessionAPI) SendToChannel(_ context.Context, channelID string, msg Mess
 	return sent.ID, nil
 }
 
-func (s *sessionAPI) StartThread(_ context.Context, channelID, messageID, name string) (string, error) {
-	thread, err := s.session.MessageThreadStartComplex(channelID, messageID, &discordgo.ThreadStart{
+func (s *sessionAPI) StartThread(_ context.Context, channelID, name string) (string, error) {
+	thread, err := s.session.ThreadStartComplex(channelID, &discordgo.ThreadStart{
 		Name:                name,
+		Type:                discordgo.ChannelTypeGuildPublicThread,
 		AutoArchiveDuration: 10080,
 	})
 	if err != nil {
@@ -43,10 +44,12 @@ func (s *sessionAPI) SendToThread(ctx context.Context, threadID string, msg Mess
 }
 
 func (s *sessionAPI) Edit(_ context.Context, channelID, messageID string, msg Message) error {
+	content := messageContent(msg)
 	embeds := toEmbeds(msg)
 	_, err := s.session.ChannelMessageEditComplex(&discordgo.MessageEdit{
 		ID:      messageID,
 		Channel: channelID,
+		Content: &content,
 		Embeds:  &embeds,
 	})
 	return err
@@ -61,6 +64,7 @@ func (s *sessionAPI) Close() error {
 
 func toMessageSend(msg Message) *discordgo.MessageSend {
 	return &discordgo.MessageSend{
+		Content:         messageContent(msg),
 		Embeds:          toEmbeds(msg),
 		AllowedMentions: &discordgo.MessageAllowedMentions{},
 	}
@@ -69,7 +73,7 @@ func toMessageSend(msg Message) *discordgo.MessageSend {
 func toEmbeds(msg Message) []*discordgo.MessageEmbed {
 	main := &discordgo.MessageEmbed{
 		Title:       msg.Title,
-		URL:         msg.URL,
+		URL:         publicURL(msg.URL),
 		Description: msg.Description,
 		Color:       embedColor,
 	}