feat: add shimmer text rendering (#2027)

packages/tui/internal/components/chat/editor.go

@@ -339,6 +339,7 @@ func (m *editorComponent) Content() string {
 	t := theme.CurrentTheme()
 	base := styles.NewStyle().Foreground(t.Text()).Background(t.Background()).Render
 	muted := styles.NewStyle().Foreground(t.TextMuted()).Background(t.Background()).Render
+
 	promptStyle := styles.NewStyle().Foreground(t.Primary()).
 		Padding(0, 0, 0, 1).
 		Bold(true)
@@ -381,9 +382,11 @@ func (m *editorComponent) Content() string {
 			status = "waiting for permission"
 		}
 		if m.interruptKeyInDebounce && m.app.CurrentPermission.ID == "" {
-			hint = muted(
-				status,
-			) + m.spinner.View() + muted(
+			bright := t.Accent()
+			if status == "waiting for permission" {
+				bright = t.Warning()
+			}
+			hint = util.Shimmer(status, t.Background(), t.TextMuted(), bright) + m.spinner.View() + muted(
 				"  ",
 			) + base(
 				keyText+" again",
@@ -391,7 +394,11 @@ func (m *editorComponent) Content() string {
 				" interrupt",
 			)
 		} else {
-			hint = muted(status) + m.spinner.View()
+			bright := t.Accent()
+			if status == "waiting for permission" {
+				bright = t.Warning()
+			}
+			hint = util.Shimmer(status, t.Background(), t.TextMuted(), bright) + m.spinner.View()
 			if m.app.CurrentPermission.ID == "" {
 				hint += muted("  ") + base(keyText) + muted(" interrupt")
 			}

packages/tui/internal/components/chat/message.go

@@ -234,7 +234,13 @@ func renderText(
 		}
 		content = util.ToMarkdown(text, width, backgroundColor)
 		if isThinking {
-			content = styles.NewStyle().Background(backgroundColor).Foreground(t.TextMuted()).Render("Thinking") + "\n\n" + content
+			label := util.Shimmer("Thinking...", backgroundColor, t.TextMuted(), t.Accent())
+			label = styles.NewStyle().Background(backgroundColor).Width(width - 6).Render(label)
+			content = label + "\n\n" + content
+		} else if strings.TrimSpace(text) == "Generating..." {
+			label := util.Shimmer(text, backgroundColor, t.TextMuted(), t.Text())
+			label = styles.NewStyle().Background(backgroundColor).Width(width - 6).Render(label)
+			content = label
 		}
 	case opencode.UserMessage:
 		ts = time.UnixMilli(int64(casted.Time.Created))
@@ -779,7 +785,9 @@ func renderToolTitle(
 ) string {
 	if toolCall.State.Status == opencode.ToolPartStateStatusPending {
 		title := renderToolAction(toolCall.Tool)
-		return styles.NewStyle().Width(width - 6).Render(title)
+		t := theme.CurrentTheme()
+		shiny := util.Shimmer(title, t.BackgroundPanel(), t.TextMuted(), t.Accent())
+		return styles.NewStyle().Width(width - 6).Render(shiny)
 	}
 
 	toolArgs := ""

packages/tui/internal/components/chat/messages.go

@@ -8,6 +8,7 @@ import (
 	"sort"
 	"strconv"
 	"strings"
+	"time"
 
 	tea "github.com/charmbracelet/bubbletea/v2"
 	"github.com/charmbracelet/lipgloss/v2"
@@ -59,6 +60,7 @@ type messagesComponent struct {
 	lineCount          int
 	selection          *selection
 	messagePositions   map[string]int // map message ID to line position
+	animating          bool
 }
 
 type selection struct {
@@ -99,6 +101,7 @@ func (s selection) coords(offset int) *selection {
 
 type ToggleToolDetailsMsg struct{}
 type ToggleThinkingBlocksMsg struct{}
+type shimmerTickMsg struct{}
 
 func (m *messagesComponent) Init() tea.Cmd {
 	return tea.Batch(m.viewport.Init())
@@ -107,6 +110,15 @@ func (m *messagesComponent) Init() tea.Cmd {
 func (m *messagesComponent) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 	var cmds []tea.Cmd
 	switch msg := msg.(type) {
+	case shimmerTickMsg:
+		if !m.app.HasAnimatingWork() {
+			m.animating = false
+			return m, nil
+		}
+		return m, tea.Sequence(
+			m.renderView(),
+			tea.Tick(90*time.Millisecond, func(t time.Time) tea.Msg { return shimmerTickMsg{} }),
+		)
 	case tea.MouseClickMsg:
 		slog.Info("mouse", "x", msg.X, "y", msg.Y, "offset", m.viewport.YOffset)
 		y := msg.Y + m.viewport.YOffset
@@ -270,6 +282,12 @@ func (m *messagesComponent) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 		if m.dirty {
 			cmds = append(cmds, m.renderView())
 		}
+
+		// Start shimmer ticks if any assistant/tool is in-flight
+		if !m.animating && m.app.HasAnimatingWork() {
+			m.animating = true
+			cmds = append(cmds, tea.Tick(90*time.Millisecond, func(t time.Time) tea.Msg { return shimmerTickMsg{} }))
+		}
 	}
 
 	m.tail = m.viewport.AtBottom()