tui: fleshed out converation selection

Don't re-init components on each state change

pkg/cmd/list.go

@@ -115,8 +115,8 @@ func ListCmd(ctx *lmcli.Context) *cobra.Command {
 		},
 	}
 
-	cmd.Flags().Bool("all", false, "Show all conversations")
+	cmd.Flags().BoolP("all", "a", false, "Show all conversations")
-	cmd.Flags().Int("count", LS_COUNT, "How many conversations to show")
+	cmd.Flags().IntP("count", "c", LS_COUNT, "How many conversations to show")
 
 	return cmd
 }

pkg/tui/chat.go

@@ -0,0 +1,889 @@
+package tui
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"strings"
+	"time"
+
+	cmdutil "git.mlow.ca/mlow/lmcli/pkg/cmd/util"
+	models "git.mlow.ca/mlow/lmcli/pkg/lmcli/model"
+	"github.com/charmbracelet/bubbles/spinner"
+	"github.com/charmbracelet/bubbles/textarea"
+	"github.com/charmbracelet/bubbles/viewport"
+	tea "github.com/charmbracelet/bubbletea"
+	"github.com/charmbracelet/lipgloss"
+	"github.com/muesli/reflow/wordwrap"
+	"gopkg.in/yaml.v2"
+)
+
+type focusState int
+
+const (
+	focusInput focusState = iota
+	focusMessages
+)
+
+type editorTarget int
+
+const (
+	input editorTarget = iota
+	selectedMessage
+)
+
+// custom tea.Msg types
+type (
+	// sent on each chunk received from LLM
+	msgResponseChunk string
+	// sent when response is finished being received
+	msgResponseEnd string
+	// a special case of msgError that stops the response waiting animation
+	msgResponseError error
+	// sent on each completed reply
+	msgAssistantReply models.Message
+	// sent when a conversation is (re)loaded
+	msgConversationLoaded *models.Conversation
+	// sent when a new conversation title is set
+	msgConversationTitleChanged string
+	// sent when a conversation's messages are laoded
+	msgMessagesLoaded []models.Message
+)
+
+type chatModel struct {
+	basemodel
+	width  int
+	height int
+
+	// app state
+	conversation    *models.Conversation
+	messages        []models.Message
+	selectedMessage int
+	waitingForReply bool
+	editorTarget    editorTarget
+	stopSignal      chan struct{}
+	replyChan       chan models.Message
+	replyChunkChan  chan string
+	persistence     bool // whether we will save new messages in the conversation
+
+	// ui state
+	focus           focusState
+	wrap            bool     // whether message content is wrapped to viewport width
+	status          string   // a general status message
+	showToolResults bool     // whether tool calls and results are shown
+	messageCache    []string // cache of syntax highlighted and wrapped message content
+	messageOffsets  []int
+
+	// ui elements
+	content viewport.Model
+	input   textarea.Model
+	spinner spinner.Model
+}
+
+func newChatModel(tui *model) chatModel {
+	m := chatModel{
+		basemodel: basemodel{
+			opts:  tui.opts,
+			ctx:   tui.ctx,
+			views: tui.views,
+		},
+
+		conversation: &models.Conversation{},
+		persistence:  true,
+
+		stopSignal:     make(chan struct{}),
+		replyChan:      make(chan models.Message),
+		replyChunkChan: make(chan string),
+
+		wrap:            true,
+		selectedMessage: -1,
+
+		content: viewport.New(0, 0),
+		input:   textarea.New(),
+		spinner: spinner.New(spinner.WithSpinner(
+			spinner.Spinner{
+				Frames: []string{
+					".  ",
+					".. ",
+					"...",
+					".. ",
+					".  ",
+					"   ",
+				},
+				FPS: time.Second / 3,
+			},
+		)),
+	}
+
+	m.input.Focus()
+	m.input.MaxHeight = 0
+	m.input.CharLimit = 0
+	m.input.ShowLineNumbers = false
+	m.input.Placeholder = "Enter a message"
+
+	m.input.FocusedStyle.CursorLine = lipgloss.NewStyle()
+	m.input.FocusedStyle.Base = inputFocusedStyle
+	m.input.BlurredStyle.Base = inputBlurredStyle
+
+	m.waitingForReply = false
+	m.status = "Press ctrl+s to send"
+	return m
+}
+
+// styles
+var (
+	headerStyle = lipgloss.NewStyle().
+			PaddingLeft(1).
+			PaddingRight(1).
+			Background(lipgloss.Color("0"))
+
+	messageHeadingStyle = lipgloss.NewStyle().
+				MarginTop(1).
+				MarginBottom(1).
+				PaddingLeft(1).
+				Bold(true)
+
+	userStyle = lipgloss.NewStyle().Faint(true).Foreground(lipgloss.Color("10"))
+
+	assistantStyle = lipgloss.NewStyle().Faint(true).Foreground(lipgloss.Color("12"))
+
+	messageStyle = lipgloss.NewStyle().
+			PaddingLeft(2).
+			PaddingRight(2)
+
+	inputFocusedStyle = lipgloss.NewStyle().
+				Border(lipgloss.RoundedBorder(), true, true, true, false)
+
+	inputBlurredStyle = lipgloss.NewStyle().
+				Faint(true).
+				Border(lipgloss.RoundedBorder(), true, true, true, false)
+
+	footerStyle = lipgloss.NewStyle()
+)
+
+func (m *chatModel) handleInput(msg tea.KeyMsg) (bool, tea.Cmd) {
+	switch m.focus {
+	case focusInput:
+		consumed, cmd := m.handleInputKey(msg)
+		if consumed {
+			return true, cmd
+		}
+	case focusMessages:
+		consumed, cmd := m.handleMessagesKey(msg)
+		if consumed {
+			return true, cmd
+		}
+	}
+
+	switch msg.String() {
+	case "esc":
+		return true, func() tea.Msg {
+			return msgChangeState(stateConversations)
+		}
+	case "ctrl+c":
+		if m.waitingForReply {
+			m.stopSignal <- struct{}{}
+			return true, nil
+		}
+		return true, func() tea.Msg {
+			return msgChangeState(stateConversations)
+		}
+	case "ctrl+p":
+		m.persistence = !m.persistence
+		return true, nil
+	case "ctrl+t":
+		m.showToolResults = !m.showToolResults
+		m.rebuildMessageCache()
+		m.updateContent()
+		return true, nil
+	case "ctrl+w":
+		m.wrap = !m.wrap
+		m.rebuildMessageCache()
+		m.updateContent()
+		return true, nil
+	}
+	return false, nil
+}
+
+func (m chatModel) Init() tea.Cmd {
+	return tea.Batch(
+		textarea.Blink,
+		m.spinner.Tick,
+		m.waitForChunk(),
+		m.waitForReply(),
+	)
+}
+
+func (m *chatModel) handleResize(width, height int) {
+	m.width, m.height = width, height
+	m.content.Width = width
+	m.input.SetWidth(width - m.input.FocusedStyle.Base.GetHorizontalFrameSize())
+	if len(m.messages) > 0 {
+		m.rebuildMessageCache()
+		m.updateContent()
+	}
+}
+
+func (m chatModel) Update(msg tea.Msg) (chatModel, tea.Cmd) {
+	var cmds []tea.Cmd
+	switch msg := msg.(type) {
+	case msgChangeState:
+		if m.opts.convShortname != "" && m.conversation.ShortName.String != m.opts.convShortname {
+			cmds = append(cmds, m.loadConversation(m.opts.convShortname))
+		}
+	case tea.WindowSizeMsg:
+		m.handleResize(msg.Width, msg.Height)
+	case 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.ctx.Store.UpdateMessage(&m.messages[m.selectedMessage])
+				if err != nil {
+					cmds = append(cmds, wrapError(fmt.Errorf("Could not save edited message: %v", err)))
+				}
+			}
+			m.updateContent()
+		}
+	case msgConversationLoaded:
+		m.conversation = (*models.Conversation)(msg)
+		cmds = append(cmds, m.loadMessages(m.conversation))
+	case msgMessagesLoaded:
+		m.selectedMessage = len(msg) - 1
+		m.setMessages(msg)
+		m.updateContent()
+		m.content.GotoBottom()
+	case msgResponseChunk:
+		chunk := string(msg)
+		last := len(m.messages) - 1
+		if last >= 0 && m.messages[last].Role.IsAssistant() {
+			m.setMessageContents(last, m.messages[last].Content+chunk)
+		} else {
+			m.addMessage(models.Message{
+				Role:    models.MessageRoleAssistant,
+				Content: chunk,
+			})
+		}
+		m.updateContent()
+		cmds = append(cmds, m.waitForChunk()) // wait for the next chunk
+	case msgAssistantReply:
+		// the last reply that was being worked on is finished
+		reply := models.Message(msg)
+		reply.Content = strings.TrimSpace(reply.Content)
+
+		last := len(m.messages) - 1
+		if last < 0 {
+			panic("Unexpected empty messages handling msgAssistantReply")
+		}
+
+		if reply.Role.IsAssistant() && m.messages[last].Role.IsAssistant() {
+			// this was a continuation, so replace the previous message with the completed reply
+			m.setMessage(last, reply)
+		} else {
+			m.addMessage(reply)
+		}
+
+		if m.persistence {
+			var err error
+			if m.conversation.ID == 0 {
+				err = m.ctx.Store.SaveConversation(m.conversation)
+			}
+			if err != nil {
+				cmds = append(cmds, wrapError(err))
+			} else {
+				cmds = append(cmds, m.persistConversation())
+			}
+		}
+
+		if m.conversation.Title == "" {
+			cmds = append(cmds, m.generateConversationTitle())
+		}
+
+		m.updateContent()
+		cmds = append(cmds, m.waitForReply())
+	case msgResponseEnd:
+		m.waitingForReply = false
+		last := len(m.messages) - 1
+		if last < 0 {
+			panic("Unexpected empty messages handling msgResponseEnd")
+		}
+		m.setMessageContents(last, strings.TrimSpace(m.messages[last].Content))
+		m.updateContent()
+		m.status = "Press ctrl+s to send"
+	case msgResponseError:
+		m.waitingForReply = false
+		m.status = "Press ctrl+s to send"
+		m.err = error(msg)
+	case msgConversationTitleChanged:
+		title := string(msg)
+		m.conversation.Title = title
+		if m.persistence {
+			err := m.ctx.Store.SaveConversation(m.conversation)
+			if err != nil {
+				cmds = append(cmds, wrapError(err))
+			}
+		}
+	}
+
+	var cmd tea.Cmd
+	m.spinner, cmd = m.spinner.Update(msg)
+	if cmd != nil {
+		cmds = append(cmds, cmd)
+	}
+
+	prevInputLineCnt := m.input.LineCount()
+	inputCaptured := false
+	m.input, cmd = m.input.Update(msg)
+	if cmd != nil {
+		inputCaptured = true
+		cmds = append(cmds, cmd)
+	}
+
+	if !inputCaptured {
+		m.content, cmd = m.content.Update(msg)
+		if cmd != nil {
+			cmds = append(cmds, cmd)
+		}
+	}
+
+	// update views once window dimensions are known
+	if m.width > 0 {
+		m.views.header = m.headerView()
+		m.views.footer = m.footerView()
+		m.views.error = errorBanner(m.err, m.width)
+		fixedHeight := height(m.views.header) + height(m.views.error) + height(m.views.footer)
+
+		// calculate clamped input height to accomodate input text
+		newHeight := max(4, min((m.height-fixedHeight-1)/2, m.input.LineCount()))
+		m.input.SetHeight(newHeight)
+		m.views.input = m.input.View()
+
+		m.content.Height = m.height - fixedHeight - height(m.views.input)
+		m.views.content = m.content.View()
+	}
+
+	// this is a pretty nasty hack to ensure the input area viewport doesn't
+	// scroll below its content, which can happen when the input viewport
+	// height has grown, or previously entered lines have been deleted
+	if prevInputLineCnt != m.input.LineCount() {
+		// dist is the distance we'd need to scroll up from the current cursor
+		// position to position the last input line at the bottom of the
+		// viewport. if negative, we're already scrolled above the bottom
+		dist := m.input.Line() - (m.input.LineCount() - m.input.Height())
+		if dist > 0 {
+			for i := 0; i < dist; i++ {
+				// move cursor up until content reaches the bottom of the viewport
+				m.input.CursorUp()
+			}
+			m.input, cmd = 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)
+		}
+	}
+
+	return m, tea.Batch(cmds...)
+}
+
+func (m *chatModel) handleMessagesKey(msg tea.KeyMsg) (bool, tea.Cmd) {
+	switch msg.String() {
+	case "tab", "enter":
+		m.focus = focusInput
+		m.updateContent()
+		m.input.Focus()
+		return true, nil
+	case "e":
+		message := m.messages[m.selectedMessage]
+		cmd := openTempfileEditor("message.*.md", message.Content, "# Edit the message below\n")
+		m.editorTarget = selectedMessage
+		return true, cmd
+	case "ctrl+k":
+		if m.selectedMessage > 0 && len(m.messages) == len(m.messageOffsets) {
+			m.selectedMessage--
+			m.updateContent()
+			offset := m.messageOffsets[m.selectedMessage]
+			scrollIntoView(&m.content, offset, m.content.Height/2)
+		}
+		return true, nil
+	case "ctrl+j":
+		if m.selectedMessage < len(m.messages)-1 && len(m.messages) == len(m.messageOffsets) {
+			m.selectedMessage++
+			m.updateContent()
+			offset := m.messageOffsets[m.selectedMessage]
+			scrollIntoView(&m.content, offset, m.content.Height/2)
+		}
+		return true, nil
+	case "ctrl+r":
+		// resubmit the conversation with all messages up until and including the selected message
+		if m.waitingForReply || len(m.messages) == 0 {
+			return true, nil
+		}
+		m.messages = m.messages[:m.selectedMessage+1]
+		m.messageCache = m.messageCache[:m.selectedMessage+1]
+		m.updateContent()
+		m.content.GotoBottom()
+		return true, m.promptLLM()
+	}
+	return false, nil
+}
+
+func (m *chatModel) handleInputKey(msg tea.KeyMsg) (bool, tea.Cmd) {
+	switch msg.String() {
+	case "esc":
+		m.focus = focusMessages
+		if len(m.messages) > 0 {
+			if m.selectedMessage < 0 || m.selectedMessage >= len(m.messages) {
+				m.selectedMessage = len(m.messages) - 1
+			}
+			offset := m.messageOffsets[m.selectedMessage]
+			scrollIntoView(&m.content, offset, m.content.Height/2)
+		}
+		m.updateContent()
+		m.input.Blur()
+		return true, nil
+	case "ctrl+s":
+		userInput := strings.TrimSpace(m.input.Value())
+		if strings.TrimSpace(userInput) == "" {
+			return true, nil
+		}
+
+		if len(m.messages) > 0 && m.messages[len(m.messages)-1].Role == models.MessageRoleUser {
+			return true, wrapError(fmt.Errorf("Can't reply to a user message"))
+		}
+
+		reply := models.Message{
+			Role:    models.MessageRoleUser,
+			Content: userInput,
+		}
+
+		if m.persistence {
+			var err error
+			if m.conversation.ID == 0 {
+				err = m.ctx.Store.SaveConversation(m.conversation)
+			}
+			if err != nil {
+				return true, wrapError(err)
+			}
+
+			// ensure all messages up to the one we're about to add are persisted
+			cmd := m.persistConversation()
+			if cmd != nil {
+				return true, cmd
+			}
+
+			savedReply, err := m.ctx.Store.AddReply(m.conversation, reply)
+			if err != nil {
+				return true, wrapError(err)
+			}
+			reply = *savedReply
+		}
+
+		m.input.SetValue("")
+		m.addMessage(reply)
+
+		m.updateContent()
+		m.content.GotoBottom()
+		return true, m.promptLLM()
+	case "ctrl+e":
+		cmd := openTempfileEditor("message.*.md", m.input.Value(), "# Edit your input below\n")
+		m.editorTarget = input
+		return true, cmd
+	}
+	return false, nil
+}
+
+func (m *chatModel) renderMessageHeading(i int, message *models.Message) string {
+	icon := ""
+	friendly := message.Role.FriendlyRole()
+	style := lipgloss.NewStyle().Faint(true).Bold(true)
+
+	switch message.Role {
+	case models.MessageRoleSystem:
+		icon = "⚙️"
+	case models.MessageRoleUser:
+		style = userStyle
+	case models.MessageRoleAssistant:
+		style = assistantStyle
+	case models.MessageRoleToolCall:
+		style = assistantStyle
+		friendly = models.MessageRoleAssistant.FriendlyRole()
+	case models.MessageRoleToolResult:
+		icon = "🔧"
+	}
+
+	user := style.Render(icon + friendly)
+
+	var prefix string
+	var suffix string
+
+	faint := lipgloss.NewStyle().Faint(true)
+	if m.focus == focusMessages {
+		if i == m.selectedMessage {
+			prefix = "> "
+		}
+	}
+
+	if message.ID == 0 {
+		suffix += faint.Render(" (not saved)")
+	}
+
+	return messageHeadingStyle.Render(prefix + user + suffix)
+}
+
+func (m *chatModel) renderMessage(msg *models.Message) string {
+	sb := &strings.Builder{}
+	sb.Grow(len(msg.Content) * 2)
+	if msg.Content != "" {
+		err := m.ctx.Chroma.Highlight(sb, msg.Content)
+		if err != nil {
+			sb.Reset()
+			sb.WriteString(msg.Content)
+		}
+	}
+
+	var toolString string
+	switch msg.Role {
+	case models.MessageRoleToolCall:
+		bytes, err := yaml.Marshal(msg.ToolCalls)
+		if err != nil {
+			toolString = "Could not serialize ToolCalls"
+		} else {
+			toolString = "tool_calls:\n" + string(bytes)
+		}
+	case models.MessageRoleToolResult:
+		if !m.showToolResults {
+			break
+		}
+
+		type renderedResult struct {
+			ToolName string `yaml:"tool"`
+			Result   any
+		}
+
+		var toolResults []renderedResult
+		for _, result := range msg.ToolResults {
+			var jsonResult interface{}
+			err := json.Unmarshal([]byte(result.Result), &jsonResult)
+			if err != nil {
+				// If parsing as JSON fails, treat Result as a plain string
+				toolResults = append(toolResults, renderedResult{
+					ToolName: result.ToolName,
+					Result:   result.Result,
+				})
+			} else {
+				// If parsing as JSON succeeds, marshal the parsed JSON into YAML
+				toolResults = append(toolResults, renderedResult{
+					ToolName: result.ToolName,
+					Result:   &jsonResult,
+				})
+			}
+		}
+
+		bytes, err := yaml.Marshal(toolResults)
+		if err != nil {
+			toolString = "Could not serialize ToolResults"
+		} else {
+			toolString = "tool_results:\n" + string(bytes)
+		}
+	}
+
+	if toolString != "" {
+		toolString = strings.TrimRight(toolString, "\n")
+		if msg.Content != "" {
+			sb.WriteString("\n\n")
+		}
+		_ = m.ctx.Chroma.HighlightLang(sb, toolString, "yaml")
+	}
+
+	content := strings.TrimRight(sb.String(), "\n")
+
+	if m.wrap {
+		wrapWidth := m.content.Width - messageStyle.GetHorizontalPadding() - 2
+		content = wordwrap.String(content, wrapWidth)
+	}
+
+	return messageStyle.Width(0).Render(content)
+}
+
+// render the conversation into a string
+func (m *chatModel) conversationMessagesView() string {
+	sb := strings.Builder{}
+
+	m.messageOffsets = make([]int, len(m.messages))
+	lineCnt := 1
+	for i, message := range m.messages {
+		m.messageOffsets[i] = lineCnt
+
+		switch message.Role {
+		case models.MessageRoleToolCall:
+			if !m.showToolResults && message.Content == "" {
+				continue
+			}
+		case models.MessageRoleToolResult:
+			if !m.showToolResults {
+				continue
+			}
+		}
+
+		heading := m.renderMessageHeading(i, &message)
+		sb.WriteString(heading)
+		sb.WriteString("\n")
+		lineCnt += lipgloss.Height(heading)
+
+		cached := m.messageCache[i]
+		sb.WriteString(cached)
+		sb.WriteString("\n")
+		lineCnt += lipgloss.Height(cached)
+	}
+
+	return sb.String()
+}
+
+func (m *chatModel) headerView() string {
+	titleStyle := lipgloss.NewStyle().Bold(true)
+	var title string
+	if m.conversation != nil && m.conversation.Title != "" {
+		title = m.conversation.Title
+	} else {
+		title = "Untitled"
+	}
+	title = truncateToCellWidth(title, m.width-headerStyle.GetHorizontalPadding(), "...")
+	header := titleStyle.Render(title)
+	return headerStyle.Width(m.width).Render(header)
+}
+
+func (m *chatModel) footerView() string {
+	segmentStyle := lipgloss.NewStyle().PaddingLeft(1).PaddingRight(1).Faint(true)
+	segmentSeparator := "|"
+
+	savingStyle := segmentStyle.Copy().Bold(true)
+	saving := ""
+	if m.persistence {
+		saving = savingStyle.Foreground(lipgloss.Color("2")).Render("✅💾")
+	} else {
+		saving = savingStyle.Foreground(lipgloss.Color("1")).Render("❌💾")
+	}
+
+	status := m.status
+	if m.waitingForReply {
+		status += m.spinner.View()
+	}
+
+	leftSegments := []string{
+		saving,
+		segmentStyle.Render(status),
+	}
+	rightSegments := []string{
+		segmentStyle.Render(fmt.Sprintf("Model: %s", *m.ctx.Config.Defaults.Model)),
+	}
+
+	left := strings.Join(leftSegments, segmentSeparator)
+	right := strings.Join(rightSegments, segmentSeparator)
+
+	totalWidth := lipgloss.Width(left) + lipgloss.Width(right)
+	remaining := m.width - totalWidth
+
+	var padding string
+	if remaining > 0 {
+		padding = strings.Repeat(" ", remaining)
+	}
+
+	footer := left + padding + right
+	if remaining < 0 {
+		footer = truncateToCellWidth(footer, m.width, "...")
+	}
+	return footerStyle.Width(m.width).Render(footer)
+}
+
+func (m *chatModel) setMessages(messages []models.Message) {
+	m.messages = messages
+	m.rebuildMessageCache()
+}
+
+func (m *chatModel) setMessage(i int, msg models.Message) {
+	if i >= len(m.messages) {
+		panic("i out of range")
+	}
+	m.messages[i] = msg
+	m.messageCache[i] = m.renderMessage(&msg)
+}
+
+func (m *chatModel) addMessage(msg models.Message) {
+	m.messages = append(m.messages, msg)
+	m.messageCache = append(m.messageCache, m.renderMessage(&msg))
+}
+
+func (m *chatModel) setMessageContents(i int, content string) {
+	if i >= len(m.messages) {
+		panic("i out of range")
+	}
+	m.messages[i].Content = content
+	m.messageCache[i] = m.renderMessage(&m.messages[i])
+}
+
+func (m *chatModel) rebuildMessageCache() {
+	m.messageCache = make([]string, len(m.messages))
+	for i, msg := range m.messages {
+		m.messageCache[i] = m.renderMessage(&msg)
+	}
+}
+
+func (m *chatModel) updateContent() {
+	atBottom := m.content.AtBottom()
+	m.content.SetContent(m.conversationMessagesView())
+	if atBottom {
+		// if we were at bottom before the update, scroll with the output
+		m.content.GotoBottom()
+	}
+}
+
+func (m *chatModel) loadConversation(shortname string) tea.Cmd {
+	return func() tea.Msg {
+		if shortname == "" {
+			return nil
+		}
+		c, err := m.ctx.Store.ConversationByShortName(shortname)
+		if err != nil {
+			return msgError(fmt.Errorf("Could not lookup conversation: %v", err))
+		}
+		if c.ID == 0 {
+			return msgError(fmt.Errorf("Conversation not found: %s", shortname))
+		}
+		return msgConversationLoaded(c)
+	}
+}
+
+func (m *chatModel) loadMessages(c *models.Conversation) tea.Cmd {
+	return func() tea.Msg {
+		messages, err := m.ctx.Store.Messages(c)
+		if err != nil {
+			return msgError(fmt.Errorf("Could not load conversation messages: %v\n", err))
+		}
+		return msgMessagesLoaded(messages)
+	}
+}
+
+func (m *chatModel) persistConversation() tea.Cmd {
+	existingMessages, err := m.ctx.Store.Messages(m.conversation)
+	if err != nil {
+		return wrapError(fmt.Errorf("Could not retrieve existing conversation messages while trying to save: %v", err))
+	}
+
+	existingById := make(map[uint]*models.Message, len(existingMessages))
+	for _, msg := range existingMessages {
+		existingById[msg.ID] = &msg
+	}
+
+	currentById := make(map[uint]*models.Message, len(m.messages))
+	for _, msg := range m.messages {
+		currentById[msg.ID] = &msg
+	}
+
+	for _, msg := range existingMessages {
+		_, ok := currentById[msg.ID]
+		if !ok {
+			err := m.ctx.Store.DeleteMessage(&msg)
+			if err != nil {
+				return wrapError(fmt.Errorf("Failed to remove messages: %v", err))
+			}
+		}
+	}
+
+	for i, msg := range m.messages {
+		if msg.ID > 0 {
+			exist, ok := existingById[msg.ID]
+			if ok {
+				if msg.Content == exist.Content {
+					continue
+				}
+				// update message when contents don't match that of store
+				err := m.ctx.Store.UpdateMessage(&msg)
+				if err != nil {
+					return wrapError(err)
+				}
+			} else {
+				// this would be quite odd... and I'm not sure how to handle
+				// it at the time of writing this
+			}
+		} else {
+			newMessage, err := m.ctx.Store.AddReply(m.conversation, msg)
+			if err != nil {
+				return wrapError(err)
+			}
+			m.setMessage(i, *newMessage)
+		}
+	}
+	return nil
+}
+
+func (m *chatModel) generateConversationTitle() tea.Cmd {
+	return func() tea.Msg {
+		title, err := cmdutil.GenerateTitle(m.ctx, m.conversation)
+		if err != nil {
+			return msgError(err)
+		}
+		return msgConversationTitleChanged(title)
+	}
+}
+
+func (m *chatModel) waitForReply() tea.Cmd {
+	return func() tea.Msg {
+		return msgAssistantReply(<-m.replyChan)
+	}
+}
+
+func (m *chatModel) waitForChunk() tea.Cmd {
+	return func() tea.Msg {
+		return msgResponseChunk(<-m.replyChunkChan)
+	}
+}
+
+func (m *chatModel) promptLLM() tea.Cmd {
+	m.waitingForReply = true
+	m.status = "Press ctrl+c to cancel"
+
+	return func() tea.Msg {
+		completionProvider, err := m.ctx.GetCompletionProvider(*m.ctx.Config.Defaults.Model)
+		if err != nil {
+			return msgError(err)
+		}
+
+		requestParams := models.RequestParameters{
+			Model:       *m.ctx.Config.Defaults.Model,
+			MaxTokens:   *m.ctx.Config.Defaults.MaxTokens,
+			Temperature: *m.ctx.Config.Defaults.Temperature,
+			ToolBag:     m.ctx.EnabledTools,
+		}
+
+		replyHandler := func(msg models.Message) {
+			m.replyChan <- msg
+		}
+
+		ctx, cancel := context.WithCancel(context.Background())
+
+		canceled := false
+		go func() {
+			select {
+			case <-m.stopSignal:
+				canceled = true
+				cancel()
+			}
+		}()
+
+		resp, err := completionProvider.CreateChatCompletionStream(
+			ctx, requestParams, m.messages, replyHandler, m.replyChunkChan,
+		)
+
+		if err != nil && !canceled {
+			return msgResponseError(err)
+		}
+
+		return msgResponseEnd(resp)
+	}
+}

pkg/tui/conversations.go

@@ -0,0 +1,277 @@
+package tui
+
+import (
+	"fmt"
+	"slices"
+	"strings"
+	"time"
+
+	models "git.mlow.ca/mlow/lmcli/pkg/lmcli/model"
+	"git.mlow.ca/mlow/lmcli/pkg/util"
+	"github.com/charmbracelet/bubbles/viewport"
+	tea "github.com/charmbracelet/bubbletea"
+	"github.com/charmbracelet/lipgloss"
+)
+
+type loadedConversation struct {
+	conv      models.Conversation
+	lastReply models.Message
+}
+
+type (
+	// sent when conversation list is loaded
+	msgConversationsLoaded ([]loadedConversation)
+	// sent when a conversation is selected
+	msgConversationSelected models.Conversation
+)
+
+type conversationsModel struct {
+	basemodel
+
+	conversations []loadedConversation
+	cursor        int   // index of the currently selected conversation
+	itemOffsets   []int // keeps track of the viewport y offset of each rendered item
+
+	content viewport.Model
+}
+
+func newConversationsModel(tui *model) conversationsModel {
+	m := conversationsModel{
+		basemodel: basemodel{
+			opts:   tui.opts,
+			ctx:    tui.ctx,
+			views:  tui.views,
+			width:  tui.width,
+			height: tui.height,
+		},
+		content: viewport.New(0, 0),
+	}
+	return m
+}
+
+func (m *conversationsModel) handleInput(msg tea.KeyMsg) (bool, tea.Cmd) {
+	switch msg.String() {
+	case "enter":
+		if len(m.conversations) > 0 && m.cursor < len(m.conversations) {
+			return true, func() tea.Msg {
+				return msgConversationSelected(m.conversations[m.cursor].conv)
+			}
+		}
+	case "j", "down":
+		if m.cursor < len(m.conversations)-1 {
+			m.cursor++
+			if m.cursor == len(m.conversations)-1 {
+				// if last conversation, simply scroll to the bottom
+				m.content.GotoBottom()
+			} else {
+				// this hack positions the *next* conversatoin slightly
+				// *off* the screen, ensuring the entire m.cursor is shown,
+				// even if its height may not be constant due to wrapping.
+				scrollIntoView(&m.content, m.itemOffsets[m.cursor+1], -1)
+			}
+			m.content.SetContent(m.renderConversationList())
+		} else {
+			m.cursor = len(m.conversations) - 1
+			m.content.GotoBottom()
+		}
+		return true, nil
+	case "k", "up":
+		if m.cursor > 0 {
+			m.cursor--
+			if m.cursor == 0 {
+				m.content.GotoTop()
+			} else {
+				scrollIntoView(&m.content, m.itemOffsets[m.cursor], 1)
+			}
+			m.content.SetContent(m.renderConversationList())
+		} else {
+			m.cursor = 0
+			m.content.GotoTop()
+		}
+		return true, nil
+	case "n":
+		// new conversation
+	case "d":
+		// show prompt to delete conversation
+	case "c":
+		// copy/clone conversation
+	case "r":
+		// show prompt to rename conversation
+	case "shift+r":
+		// show prompt to generate name for conversation
+	}
+	return false, nil
+}
+
+func (m conversationsModel) Init() tea.Cmd {
+	return nil
+}
+
+func (m *conversationsModel) handleResize(width, height int) {
+	m.width, m.height = width, height
+	m.content.Width = width
+}
+
+func (m conversationsModel) Update(msg tea.Msg) (conversationsModel, tea.Cmd) {
+	var cmds []tea.Cmd
+	switch msg := msg.(type) {
+	case msgChangeState:
+		cmds = append(cmds, m.loadConversations())
+		m.content.SetContent(m.renderConversationList())
+	case tea.WindowSizeMsg:
+		m.handleResize(msg.Width, msg.Height)
+		m.content.SetContent(m.renderConversationList())
+	case msgConversationsLoaded:
+		m.conversations = msg
+		m.content.SetContent(m.renderConversationList())
+	}
+
+	var cmd tea.Cmd
+	m.content, cmd = m.content.Update(msg)
+	if cmd != nil {
+		cmds = append(cmds, cmd)
+	}
+
+	if m.width > 0 {
+		m.views.header = m.headerView()
+		m.views.footer = "" // TODO: show /something/
+		m.views.error = errorBanner(m.err, m.width)
+		fixedHeight := height(m.views.header) + height(m.views.error) + height(m.views.footer)
+		m.content.Height = m.height - fixedHeight
+		m.views.content = m.content.View()
+	}
+	return m, tea.Batch(cmds...)
+}
+
+func (m *conversationsModel) loadConversations() tea.Cmd {
+	return func() tea.Msg {
+		conversations, err := m.ctx.Store.Conversations()
+		if err != nil {
+			return msgError(fmt.Errorf("Could not load conversations: %v", err))
+		}
+
+		loaded := make([]loadedConversation, len(conversations))
+		for i, c := range conversations {
+			lastMessage, err := m.ctx.Store.LastMessage(&c)
+			if err != nil {
+				return msgError(err)
+			}
+			loaded[i].conv = c
+			loaded[i].lastReply = *lastMessage
+		}
+
+		slices.SortFunc(loaded, func(a, b loadedConversation) int {
+			return b.lastReply.CreatedAt.Compare(a.lastReply.CreatedAt)
+		})
+
+		return msgConversationsLoaded(loaded)
+	}
+}
+
+func (m *conversationsModel) headerView() string {
+	titleStyle := lipgloss.NewStyle().Bold(true)
+	header := titleStyle.Render("Conversations")
+	return headerStyle.Width(m.width).Render(header)
+}
+
+func (m *conversationsModel) renderConversationList() string {
+	type timeCategory struct {
+		name   string
+		cutoff time.Duration
+	}
+
+	type listItem struct {
+		id           uint
+		short        string
+		title        string
+		elapsed      string
+		lastReplyAge time.Duration
+	}
+
+	now := time.Now()
+	midnight := time.Date(now.Year(), now.Month(), now.Day(), 0, 0, 0, 0, now.Location())
+	monthStart := time.Date(now.Year(), now.Month(), 1, 0, 0, 0, 0, now.Location())
+	dayOfWeek := int(now.Weekday())
+	categories := []timeCategory{
+		{"Today", now.Sub(midnight)},
+		{"Yesterday", now.Sub(midnight.AddDate(0, 0, -1))},
+		{"This week", now.Sub(midnight.AddDate(0, 0, -dayOfWeek))},
+		{"Last week", now.Sub(midnight.AddDate(0, 0, -(dayOfWeek + 7)))},
+		{"This month", now.Sub(monthStart)},
+		{"Last month", now.Sub(monthStart.AddDate(0, -1, 0))},
+		{"2 Months ago", now.Sub(monthStart.AddDate(0, -2, 0))},
+		{"3 Months ago", now.Sub(monthStart.AddDate(0, -3, 0))},
+		{"4 Months ago", now.Sub(monthStart.AddDate(0, -4, 0))},
+		{"5 Months ago", now.Sub(monthStart.AddDate(0, -5, 0))},
+		{"6 Months ago", now.Sub(monthStart.AddDate(0, -6, 0))},
+		{"Older", now.Sub(time.Time{})},
+	}
+
+	categoryStyle := lipgloss.NewStyle().
+		MarginBottom(1).
+		Foreground(lipgloss.Color("170")).
+		PaddingLeft(1).
+		Bold(true)
+
+	itemStyle := lipgloss.NewStyle().
+		MarginBottom(1)
+
+	ageStyle := lipgloss.NewStyle().Faint(true).SetString()
+	titleStyle := lipgloss.NewStyle().Bold(true)
+	untitledStyle := lipgloss.NewStyle().Faint(true).Italic(true)
+	selectedStyle := lipgloss.NewStyle().Faint(true).Foreground(lipgloss.Color("6"))
+
+	var currentOffset int
+	var currentCategory string
+	m.itemOffsets = make([]int, len(m.conversations))
+	sb := &strings.Builder{}
+	sb.WriteRune('\n')
+	currentOffset += 1
+	for i, c := range m.conversations {
+		lastReplyAge := now.Sub(c.lastReply.CreatedAt)
+
+		var category string
+		for _, g := range categories {
+			if lastReplyAge < g.cutoff {
+				category = g.name
+				break
+			}
+		}
+
+		// print the category
+		if category != currentCategory {
+			currentCategory = category
+			heading := categoryStyle.Render(currentCategory)
+			sb.WriteString(heading)
+			currentOffset += height(heading)
+			sb.WriteRune('\n')
+		}
+
+		tStyle := titleStyle.Copy()
+		padding := "  "
+		if c.conv.Title == "" {
+			tStyle = tStyle.Inherit(untitledStyle).SetString("(untitled)")
+		}
+		if i == m.cursor {
+			tStyle = tStyle.Inherit(selectedStyle)
+		}
+
+		title := tStyle.Width(m.width - 3).PaddingLeft(2).Render(c.conv.Title)
+		if i == m.cursor {
+			title = ">" + title[1:]
+		}
+
+		m.itemOffsets[i] = currentOffset
+		item := itemStyle.Render(fmt.Sprintf(
+			"%s\n%s",
+			title,
+			padding+ageStyle.Render(util.HumanTimeElapsedSince(lastReplyAge)),
+		))
+		sb.WriteString(item)
+		currentOffset += height(item)
+		if i < len(m.conversations)-1 {
+			sb.WriteRune('\n')
+		}
+	}
+	return sb.String()
+}

pkg/tui/util.go

@@ -5,7 +5,9 @@ import (
 	"os/exec"
 	"strings"
 
+	"github.com/charmbracelet/bubbles/viewport"
 	tea "github.com/charmbracelet/bubbletea"
+	"github.com/muesli/reflow/ansi"
 )
 
 type msgTempfileEditorClosed string
@@ -32,6 +34,7 @@ func openTempfileEditor(pattern string, content string, placeholder string) tea.
 		if err != nil {
 			return msgError(err)
 		}
+		os.Remove(msgFile.Name())
 		fileContents := string(bytes)
 		if strings.HasPrefix(fileContents, placeholder) {
 			fileContents = fileContents[len(placeholder):]
@@ -40,3 +43,47 @@ func openTempfileEditor(pattern string, content string, placeholder string) tea.
 		return msgTempfileEditorClosed(stripped)
 	})
 }
+
+// similar to lipgloss.Height, except returns 0 on empty strings
+func height(str string) int {
+	if str == "" {
+		return 0
+	}
+	return strings.Count(str, "\n") + 1
+}
+
+// truncate a string until its rendered cell width + the provided tail fits
+// within the given width
+func truncateToCellWidth(str string, width int, tail string) string {
+	cellWidth := ansi.PrintableRuneWidth(str)
+	if cellWidth <= width {
+		return str
+	}
+	tailWidth := ansi.PrintableRuneWidth(tail)
+	for {
+		str = str[:len(str)-((cellWidth+tailWidth)-width)]
+		cellWidth = ansi.PrintableRuneWidth(str)
+		if cellWidth+tailWidth <= max(width, 0) {
+			break
+		}
+	}
+	return str + tail
+}
+
+// fraction is the fraction of the total screen height into view the offset
+// should be scrolled into view. 0.5 = items will be snapped to middle of
+// view
+func scrollIntoView(vp *viewport.Model, offset int, edge int) {
+	currentOffset := vp.YOffset
+	if offset >= currentOffset && offset < currentOffset+vp.Height {
+		return
+	}
+	distance := currentOffset - offset
+	if distance < 0 {
+		// we should scroll down until it just comes into view
+		vp.SetYOffset(currentOffset - (distance + (vp.Height - edge)) + 1)
+	} else {
+		// we should scroll up
+		vp.SetYOffset(currentOffset - distance - edge)
+	}
+}