Fixes to message/conversation handling in tui chat view

This set of changes fixes root/child message cycling and ensures all
database operations happen within a `tea.Cmd`

pkg/lmcli/store.go

@@ -241,6 +241,7 @@ func (s *SQLStore) Reply(to *model.Message, messages ...model.Message) ([]model.
 			}
 
 			// update parent selected reply
+			currentParent.Replies = append(currentParent.Replies, message)
 			currentParent.SelectedReply = &message
 			if err := tx.Model(currentParent).Update("selected_reply_id", message.ID).Error; err != nil {
 				return err
@@ -257,7 +258,7 @@ func (s *SQLStore) Reply(to *model.Message, messages ...model.Message) ([]model.
 
 // CloneBranch returns a deep clone of the given message and its replies, returning
 // a new message object. The new message will be attached to the same parent as
-// the message to clone.
+// the messageToClone
 func (s *SQLStore) CloneBranch(messageToClone model.Message) (*model.Message, uint, error) {
 	newMessage := messageToClone
 	newMessage.ID = 0
@@ -302,7 +303,7 @@ func (s *SQLStore) CloneBranch(messageToClone model.Message) (*model.Message, ui
 
 func fetchMessages(db *gorm.DB) ([]model.Message, error) {
 	var messages []model.Message
-	if err := db.Find(&messages).Error; err != nil {
+	if err := db.Preload("Conversation").Find(&messages).Error; err != nil {
 		return nil, fmt.Errorf("Could not fetch messages: %v", err)
 	}
 
@@ -375,7 +376,9 @@ func (s *SQLStore) buildPath(message *model.Message, getNext func(*model.Message
 	return path, nil
 }
 
-// PathToRoot traverses message Parent until reaching the tree root
+// PathToRoot traverses the provided message's Parent until reaching the tree
+// root and returns a slice of all messages traversed in chronological order
+// (starting with the root and ending with the message provided)
 func (s *SQLStore) PathToRoot(message *model.Message) ([]model.Message, error) {
 	if message == nil || message.ID <= 0 {
 		return nil, fmt.Errorf("Message is nil or has invalid ID")
@@ -392,7 +395,9 @@ func (s *SQLStore) PathToRoot(message *model.Message) ([]model.Message, error) {
 	return path, nil
 }
 
-// PathToLeaf traverses message SelectedReply until reaching a tree leaf
+// PathToLeaf traverses the provided message's SelectedReply until reaching a
+// tree leaf and returns a slice of all messages traversed in chronological
+// order (starting with the message provided and ending with the leaf)
 func (s *SQLStore) PathToLeaf(message *model.Message) ([]model.Message, error) {
 	if message == nil || message.ID <= 0 {
 		return nil, fmt.Errorf("Message is nil or has invalid ID")

pkg/tui/views/chat/chat.go

@@ -36,13 +36,29 @@ type (
 	// a special case of common.MsgError that stops the response waiting animation
 	msgResponseError error
 	// sent on each completed reply
-	msgAssistantReply models.Message
+	msgResponse models.Message
 	// sent when a conversation is (re)loaded
-	msgConversationLoaded *models.Conversation
-	// sent when a new conversation title is set
-	msgConversationTitleChanged string
+	msgConversationLoaded struct {
+		conversation *models.Conversation
+		rootMessages []models.Message
+	}
+	// sent when a new conversation title generated
+	msgConversationTitleGenerated string
 	// sent when a conversation's messages are laoded
 	msgMessagesLoaded []models.Message
+	// sent when the conversation has been persisted, triggers a reload of contents
+	msgConversationPersisted struct {
+		conversation *models.Conversation
+		messages     []models.Message
+	}
+	// sent when the given message is made the new selected reply of its parent
+	msgSelectedReplyCycled *models.Message
+	// sent when the given message is made the new selected root of the current conversation
+	msgSelectedRootCycled *models.Message
+	// sent when a message's contents are updated and saved
+	msgMessageUpdated *models.Message
+	// sent when a message is cloned, with the cloned message
+	msgMessageCloned *models.Message
 )
 
 type Model struct {
@@ -141,7 +157,7 @@ func Chat(state shared.State) Model {
 
 func (m Model) Init() tea.Cmd {
 	return tea.Batch(
-		m.waitForChunk(),
-		m.waitForReply(),
+		m.waitForResponseChunk(),
+		m.waitForResponse(),
 	)
 }

pkg/tui/views/chat/conversation.go

@@ -60,13 +60,17 @@ func (m *Model) loadConversation(shortname string) tea.Cmd {
 		if c.ID == 0 {
 			return shared.MsgError(fmt.Errorf("Conversation not found: %s", shortname))
 		}
-		return msgConversationLoaded(c)
+		rootMessages, err := m.State.Ctx.Store.RootMessages(c.ID)
+		if err != nil {
+			return shared.MsgError(fmt.Errorf("Could not load conversation root messages: %v\n", err))
+		}
+		return msgConversationLoaded{c, rootMessages}
 	}
 }
 
-func (m *Model) loadMessages(c *models.Conversation) tea.Cmd {
+func (m *Model) loadConversationMessages() tea.Cmd {
 	return func() tea.Msg {
-		messages, err := m.State.Ctx.Store.PathToLeaf(c.SelectedRoot)
+		messages, err := m.State.Ctx.Store.PathToLeaf(m.conversation.SelectedRoot)
 		if err != nil {
 			return shared.MsgError(fmt.Errorf("Could not load conversation messages: %v\n", err))
 		}
@@ -80,127 +84,170 @@ func (m *Model) generateConversationTitle() tea.Cmd {
 		if err != nil {
 			return shared.MsgError(err)
 		}
-		return msgConversationTitleChanged(title)
+		return msgConversationTitleGenerated(title)
 	}
 }
 
-func cycleMessages(curr *models.Message, msgs []models.Message, dir MessageCycleDirection) (*models.Message, error) {
+func (m *Model) updateConversationTitle(conversation *models.Conversation) tea.Cmd {
+	return func() tea.Msg {
+		err := m.State.Ctx.Store.UpdateConversation(conversation)
+		if err != nil {
+			return shared.WrapError(err)
+		}
+		return nil
+	}
+}
+
+// Clones the given message (and its descendents). If selected is true, updates
+// either its parent's SelectedReply or its conversation's SelectedRoot to
+// point to the new clone
+func (m *Model) cloneMessage(message models.Message, selected bool) tea.Cmd {
+	return func() tea.Msg {
+		msg, _, err := m.Ctx.Store.CloneBranch(message)
+		if err != nil {
+			return shared.WrapError(fmt.Errorf("Could not clone message: %v", err))
+		}
+		if selected {
+			if msg.Parent == nil {
+				msg.Conversation.SelectedRoot = msg
+				err = m.State.Ctx.Store.UpdateConversation(&msg.Conversation)
+			} else {
+				msg.Parent.SelectedReply = msg
+				err = m.State.Ctx.Store.UpdateMessage(msg.Parent)
+			}
+			if err != nil {
+				return shared.WrapError(fmt.Errorf("Could not update selected message: %v", err))
+			}
+		}
+		return msgMessageCloned(msg)
+	}
+}
+
+func (m *Model) updateMessageContent(message *models.Message) tea.Cmd {
+	return func() tea.Msg {
+		err := m.State.Ctx.Store.UpdateMessage(message)
+		if err != nil {
+			return shared.WrapError(fmt.Errorf("Could not update message: %v", err))
+		}
+		return msgMessageUpdated(message)
+	}
+}
+
+func cycleSelectedMessage(selected *models.Message, choices []models.Message, dir MessageCycleDirection) (*models.Message, error) {
 	currentIndex := -1
-	for i, reply := range msgs {
-		if reply.ID == curr.ID {
+	for i, reply := range choices {
+		if reply.ID == selected.ID {
 			currentIndex = i
 			break
 		}
 	}
 
 	if currentIndex < 0 {
-		return nil, fmt.Errorf("message not found")
+		// this should probably be an assert
+		return nil, fmt.Errorf("Selected message %d not found in choices, this is a bug", selected.ID)
 	}
 
 	var next int
 	if dir == CyclePrev {
 		// Wrap around to the last reply if at the beginning
-		next = (currentIndex - 1 + len(msgs)) % len(msgs)
+		next = (currentIndex - 1 + len(choices)) % len(choices)
 	} else {
 		// Wrap around to the first reply if at the end
-		next = (currentIndex + 1) % len(msgs)
+		next = (currentIndex + 1) % len(choices)
 	}
-	return &msgs[next], nil
+	return &choices[next], nil
 }
 
-func (m *Model) cycleSelectedRoot(conv *models.Conversation, dir MessageCycleDirection) (*models.Message, error) {
+func (m *Model) cycleSelectedRoot(conv *models.Conversation, dir MessageCycleDirection) tea.Cmd {
 	if len(m.rootMessages) < 2 {
-		return nil, nil
+		return nil
 	}
 
-	nextRoot, err := cycleMessages(conv.SelectedRoot, m.rootMessages, dir)
+	return func() tea.Msg {
+		nextRoot, err := cycleSelectedMessage(conv.SelectedRoot, m.rootMessages, dir)
 		if err != nil {
-		return nil, err
+			return shared.WrapError(err)
 		}
 
 		conv.SelectedRoot = nextRoot
 		err = m.State.Ctx.Store.UpdateConversation(conv)
 		if err != nil {
-		return nil, fmt.Errorf("Could not update conversation SelectedRoot: %v", err)
+			return shared.WrapError(fmt.Errorf("Could not update conversation SelectedRoot: %v", err))
+		}
+		return msgSelectedRootCycled(nextRoot)
 	}
-	return nextRoot, nil
 }
 
-func (m *Model) cycleSelectedReply(message *models.Message, dir MessageCycleDirection) (*models.Message, error) {
+func (m *Model) cycleSelectedReply(message *models.Message, dir MessageCycleDirection) tea.Cmd {
 	if len(message.Replies) < 2 {
-		return nil, nil
+		return nil
 	}
 
-	nextReply, err := cycleMessages(message.SelectedReply, message.Replies, dir)
+	return func() tea.Msg {
+		nextReply, err := cycleSelectedMessage(message.SelectedReply, message.Replies, dir)
 		if err != nil {
-		return nil, err
+			return shared.WrapError(err)
 		}
 
 		message.SelectedReply = nextReply
 		err = m.State.Ctx.Store.UpdateMessage(message)
 		if err != nil {
-		return nil, fmt.Errorf("Could not update message SelectedReply: %v", err)
+			return shared.WrapError(fmt.Errorf("Could not update message SelectedReply: %v", err))
+		}
+		return msgSelectedReplyCycled(nextReply)
 	}
-	return nextReply, nil
 }
 
-func (m *Model) persistConversation() error {
+func (m *Model) persistConversation() tea.Cmd {
+	conversation := m.conversation
+	messages := m.messages
+
+	var err error
 	if m.conversation.ID == 0 {
+		return func() tea.Msg {
 			// Start a new conversation with all messages so far
-		c, messages, err := m.State.Ctx.Store.StartConversation(m.messages...)
+			conversation, messages, err = m.State.Ctx.Store.StartConversation(messages...)
 			if err != nil {
-			return err
+				return shared.MsgError(fmt.Errorf("Could not start new conversation: %v", err))
+			}
+			return msgConversationPersisted{conversation, messages}
 		}
-		m.conversation = c
-		m.messages = messages
-
-		return nil
 	}
 
+	return func() tea.Msg {
 		// else, we'll handle updating an existing conversation's messages
-	for i := 0; i < len(m.messages); i++ {
-		if m.messages[i].ID > 0 {
+		for i := range messages {
+			if messages[i].ID > 0 {
 				// message has an ID, update its contents
-			// TODO: check for content/tool equality before updating?
-			err := m.State.Ctx.Store.UpdateMessage(&m.messages[i])
+				err := m.State.Ctx.Store.UpdateMessage(&messages[i])
 				if err != nil {
-				return err
+					return shared.MsgError(err)
 				}
 			} else if i > 0 {
-			// messages is new, so add it as a reply to previous message
-			saved, err := m.State.Ctx.Store.Reply(&m.messages[i-1], m.messages[i])
-			if err != nil {
-				return err
+				if messages[i].Content == "" {
+					continue
 				}
-			// add this message as a reply to the previous
-			m.messages[i-1].Replies = append(m.messages[i-1].Replies, saved[0])
-			m.messages[i] = saved[0]
+				// messages is new, so add it as a reply to previous message
+				saved, err := m.State.Ctx.Store.Reply(&messages[i-1], messages[i])
+				if err != nil {
+					return shared.MsgError(err)
+				}
+				messages[i] = saved[0]
 			} else {
 				// message has no id and no previous messages to add it to
 				// this shouldn't happen?
 				return fmt.Errorf("Error: no messages to reply to")
 			}
 		}
-
-	return nil
+		return msgConversationPersisted{conversation, messages}
+	}
 }
-
 
 func (m *Model) promptLLM() tea.Cmd {
 	m.waitingForReply = true
 	m.replyCursor.Blink = false
 	m.status = "Press ctrl+c to cancel"
 
-	toPrompt := m.messages
-
-	// Add response placeholder message
-	if m.messages[len(m.messages)-1].Role != models.MessageRoleAssistant {
-		m.addMessage(models.Message{
-			Role:    models.MessageRoleAssistant,
-			Content: "",
-		})
-	}
-
 	m.tokenCount = 0
 	m.startTime = time.Now()
 	m.elapsed = 0
@@ -234,7 +281,7 @@ func (m *Model) promptLLM() tea.Cmd {
 		}()
 
 		resp, err := provider.CreateChatCompletionStream(
-			ctx, requestParams, toPrompt, replyHandler, m.replyChunkChan,
+			ctx, requestParams, m.messages, replyHandler, m.replyChunkChan,
 		)
 
 		if err != nil && !canceled {

pkg/tui/views/chat/input.go

@@ -71,10 +71,15 @@ func (m *Model) handleMessagesKey(msg tea.KeyMsg) (bool, tea.Cmd) {
 		m.input.Focus()
 		return true, nil
 	case "e":
-		message := m.messages[m.selectedMessage]
-		cmd := tuiutil.OpenTempfileEditor("message.*.md", message.Content, "# Edit the message below\n")
+		if m.selectedMessage < len(m.messages) {
 			m.editorTarget = selectedMessage
-		return true, cmd
+			return true, tuiutil.OpenTempfileEditor(
+				"message.*.md",
+				m.messages[m.selectedMessage].Content,
+				"# Edit the message below\n",
+			)
+		}
+		return false, nil
 	case "ctrl+k":
 		if m.selectedMessage > 0 && len(m.messages) == len(m.messageOffsets) {
 			m.selectedMessage--
@@ -97,34 +102,14 @@ func (m *Model) handleMessagesKey(msg tea.KeyMsg) (bool, tea.Cmd) {
 			dir = CycleNext
 		}
 
-		var err error
-		var selected *models.Message
+		var cmd tea.Cmd
 		if m.selectedMessage == 0 {
-			selected, err = m.cycleSelectedRoot(m.conversation, dir)
-			if err != nil {
-				return true, shared.WrapError(fmt.Errorf("Could not cycle conversation root: %v", err))
-			}
+			cmd = m.cycleSelectedRoot(m.conversation, dir)
 		} else if m.selectedMessage > 0 {
-			selected, err = m.cycleSelectedReply(&m.messages[m.selectedMessage-1], dir)
-			if err != nil {
-				return true, shared.WrapError(fmt.Errorf("Could not cycle reply: %v", err))
-			}
+			cmd = m.cycleSelectedReply(&m.messages[m.selectedMessage-1], dir)
 		}
 
-		if selected == nil {
-			return false, nil
-		}
-
-		// Retrieve updated view at this point
-		newPath, err := m.State.Ctx.Store.PathToLeaf(selected)
-		if err != nil {
-			m.State.Err = fmt.Errorf("Could not fetch messages: %v", err)
-		}
-
-		m.messages = append(m.messages[:m.selectedMessage], newPath...)
-		m.rebuildMessageCache()
-		m.updateContent()
-		return true, nil
+		return cmd != nil, cmd
 	case "ctrl+r":
 		// resubmit the conversation with all messages up until and including the selected message
 		if m.waitingForReply || len(m.messages) == 0 {
@@ -177,17 +162,16 @@ func (m *Model) handleInputKey(msg tea.KeyMsg) (bool, tea.Cmd) {
 
 		m.input.SetValue("")
 
+		var cmds []tea.Cmd
 		if m.persistence {
-			err := m.persistConversation()
-			if err != nil {
-				return true, shared.WrapError(err)
-			}
+			cmds = append(cmds, m.persistConversation())
 		}
 
-		cmd := m.promptLLM()
+		cmds = append(cmds, m.promptLLM())
+
 		m.updateContent()
 		m.content.GotoBottom()
-		return true, cmd
+		return true, tea.Batch(cmds...)
 	case "ctrl+e":
 		cmd := tuiutil.OpenTempfileEditor("message.*.md", m.input.Value(), "# Edit your input below\n")
 		m.editorTarget = input

pkg/tui/views/chat/update.go

@@ -1,7 +1,6 @@
 package chat
 
 import (
-	"fmt"
 	"strings"
 	"time"
 
@@ -22,13 +21,13 @@ func (m *Model) HandleResize(width, height int) {
 	}
 }
 
-func (m *Model) waitForReply() tea.Cmd {
+func (m *Model) waitForResponse() tea.Cmd {
 	return func() tea.Msg {
-		return msgAssistantReply(<-m.replyChan)
+		return msgResponse(<-m.replyChan)
 	}
 }
 
-func (m *Model) waitForChunk() tea.Cmd {
+func (m *Model) waitForResponseChunk() tea.Cmd {
 	return func() tea.Msg {
 		return msgResponseChunk(<-m.replyChunkChan)
 	}
@@ -37,46 +36,59 @@ func (m *Model) waitForChunk() tea.Cmd {
 func (m Model) Update(msg tea.Msg) (Model, tea.Cmd) {
 	var cmds []tea.Cmd
 	switch msg := msg.(type) {
+	case tea.WindowSizeMsg:
+		m.HandleResize(msg.Width, msg.Height)
 	case shared.MsgViewEnter:
 		// wake up spinners and cursors
 		cmds = append(cmds, cursor.Blink, m.spinner.Tick)
 
-		if m.State.Values.ConvShortname != "" && m.conversation.ShortName.String != m.State.Values.ConvShortname {
+		if m.State.Values.ConvShortname != "" {
+			// (re)load conversation contents
 			cmds = append(cmds, m.loadConversation(m.State.Values.ConvShortname))
+
+			if m.conversation.ShortName.String != m.State.Values.ConvShortname {
+				// clear existing messages if we're loading a new conversation
+				m.messages = []models.Message{}
+				m.selectedMessage = 0
+			}
 		}
 
 		m.rebuildMessageCache()
 		m.updateContent()
-	case tea.WindowSizeMsg:
-		m.HandleResize(msg.Width, msg.Height)
 	case tuiutil.MsgTempfileEditorClosed:
 		contents := string(msg)
 		switch m.editorTarget {
 		case input:
 			m.input.SetValue(contents)
 		case selectedMessage:
-			m.setMessageContents(m.selectedMessage, contents)
-			if m.persistence && m.messages[m.selectedMessage].ID > 0 {
-				// update persisted message
-				err := m.State.Ctx.Store.UpdateMessage(&m.messages[m.selectedMessage])
-				if err != nil {
-					cmds = append(cmds, shared.WrapError(fmt.Errorf("Could not save edited message: %v", err)))
+			toEdit := m.messages[m.selectedMessage]
+			if toEdit.Content != contents {
+				toEdit.Content = contents
+				m.setMessage(m.selectedMessage, toEdit)
+				if m.persistence && toEdit.ID > 0 {
+					// create clone of message with its new contents
+					cmds = append(cmds, m.cloneMessage(toEdit, true))
 				}
 			}
-			m.updateContent()
 		}
 	case msgConversationLoaded:
-		m.conversation = (*models.Conversation)(msg)
-		m.rootMessages, _ = m.State.Ctx.Store.RootMessages(m.conversation.ID)
-		cmds = append(cmds, m.loadMessages(m.conversation))
+		m.conversation = msg.conversation
+		m.rootMessages = msg.rootMessages
+		m.selectedMessage = -1
+		if len(m.rootMessages) > 0 {
+			cmds = append(cmds, m.loadConversationMessages())
+		}
 	case msgMessagesLoaded:
-		m.selectedMessage = len(msg) - 1
 		m.messages = msg
+		if m.selectedMessage == -1 {
+			m.selectedMessage = len(msg) - 1
+		} else {
+			m.selectedMessage = min(m.selectedMessage, len(m.messages))
+		}
 		m.rebuildMessageCache()
 		m.updateContent()
-		m.content.GotoBottom()
 	case msgResponseChunk:
-		cmds = append(cmds, m.waitForChunk()) // wait for the next chunk
+		cmds = append(cmds, m.waitForResponseChunk()) // wait for the next chunk
 
 		chunk := string(msg)
 		if chunk == "" {
@@ -102,8 +114,8 @@ func (m Model) Update(msg tea.Msg) (Model, tea.Cmd) {
 
 		m.tokenCount++
 		m.elapsed = time.Now().Sub(m.startTime)
-	case msgAssistantReply:
-		cmds = append(cmds, m.waitForReply()) // wait for the next reply
+	case msgResponse:
+		cmds = append(cmds, m.waitForResponse()) // wait for the next response
 
 		reply := models.Message(msg)
 		reply.Content = strings.TrimSpace(reply.Content)
@@ -121,10 +133,7 @@ func (m Model) Update(msg tea.Msg) (Model, tea.Cmd) {
 		}
 
 		if m.persistence {
-			err := m.persistConversation()
-			if err != nil {
-				cmds = append(cmds, shared.WrapError(err))
-			}
+			cmds = append(cmds, m.persistConversation())
 		}
 
 		if m.conversation.Title == "" {
@@ -146,20 +155,30 @@ func (m Model) Update(msg tea.Msg) (Model, tea.Cmd) {
 		m.status = "Press ctrl+s to send"
 		m.State.Err = error(msg)
 		m.updateContent()
-	case msgConversationTitleChanged:
+	case msgConversationTitleGenerated:
 		title := string(msg)
 		m.conversation.Title = title
 		if m.persistence {
-			err := m.State.Ctx.Store.UpdateConversation(m.conversation)
-			if err != nil {
-				cmds = append(cmds, shared.WrapError(err))
-			}
+			cmds = append(cmds, m.updateConversationTitle(m.conversation))
 		}
 	case cursor.BlinkMsg:
 		if m.waitingForReply {
-			// ensure we show updated "wait for response" cursor blink state
+			// ensure we show the updated "wait for response" cursor blink state
 			m.updateContent()
 		}
+	case msgConversationPersisted:
+		m.conversation = msg.conversation
+		m.messages = msg.messages
+		m.rebuildMessageCache()
+		m.updateContent()
+	case msgMessageCloned:
+		if msg.Parent == nil {
+			m.conversation = &msg.Conversation
+			m.rootMessages = append(m.rootMessages, *msg)
+		}
+		cmds = append(cmds, m.loadConversationMessages())
+	case msgSelectedRootCycled, msgSelectedReplyCycled, msgMessageUpdated:
+		cmds = append(cmds, m.loadConversationMessages())
 	}
 
 	var cmd tea.Cmd
@@ -218,12 +237,12 @@ func (m Model) Update(msg tea.Msg) (Model, tea.Cmd) {
 				// move cursor up until content reaches the bottom of the viewport
 				m.input.CursorUp()
 			}
-			m.input, cmd = m.input.Update(nil)
+			m.input, _ = m.input.Update(nil)
 			for i := 0; i < dist; i++ {
 				// move cursor back down to its previous position
 				m.input.CursorDown()
 			}
-			m.input, cmd = m.input.Update(nil)
+			m.input, _ = m.input.Update(nil)
 		}
 	}
 

pkg/tui/views/chat/view.go

@@ -89,7 +89,7 @@ func (m *Model) renderMessageHeading(i int, message *models.Message) string {
 
 	faint := lipgloss.NewStyle().Faint(true)
 
-	if i == 0 && len(m.rootMessages) > 0 {
+	if i == 0 && len(m.rootMessages) > 1 && m.conversation.SelectedRootID != nil {
 		selectedRootIndex := 0
 		for j, reply := range m.rootMessages {
 			if reply.ID == *m.conversation.SelectedRootID {
@@ -139,7 +139,7 @@ func (m *Model) renderMessage(i int) string {
 	}
 
 	// Show the assistant's cursor
-	if m.waitingForReply && i == len(m.messages)-1 {
+	if m.waitingForReply && i == len(m.messages)-1 && msg.Role == models.MessageRoleAssistant {
 		sb.WriteString(m.replyCursor.View())
 	}
 
@@ -250,6 +250,17 @@ func (m *Model) conversationMessagesView() string {
 		lineCnt += lipgloss.Height(rendered)
 	}
 
+	// Render a placeholder for the incoming assistant reply
+	if m.waitingForReply && (len(m.messages) == 0 || m.messages[len(m.messages)-1].Role != models.MessageRoleAssistant) {
+		heading := m.renderMessageHeading(-1, &models.Message{
+			Role: models.MessageRoleAssistant,
+		})
+		sb.WriteString(heading)
+		sb.WriteString("\n")
+		sb.WriteString(messageStyle.Width(0).Render(m.replyCursor.View()))
+		sb.WriteString("\n")
+	}
+
 	return sb.String()
 }