tui: Chat view footer rewrite

Rewrote footer handling to better handle truncation, and use
`ActiveModel` to return the (stylized) active model

pkg/tui/util/util.go

@@ -54,6 +54,13 @@ func Height(str string) int {
 	return strings.Count(str, "\n") + 1
 }
 
+func Width(str string) int {
+	if str == "" {
+		return 0
+	}
+	return ansi.PrintableRuneWidth(str)
+}
+
 // 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 {

pkg/tui/views/chat/view.go

@@ -261,6 +261,10 @@ func (m *Model) Footer(width int) string {
 	segmentStyle := lipgloss.NewStyle().PaddingLeft(1).PaddingRight(1).Faint(true)
 	segmentSeparator := "|"
 
+	// Left segments
+
+	leftSegments := []string{}
+
 	savingStyle := segmentStyle.Bold(true)
 	saving := ""
 	if m.persistence {
@@ -268,6 +272,20 @@ func (m *Model) Footer(width int) string {
 	} else {
 		saving = savingStyle.Foreground(lipgloss.Color("1")).Render("❌💾")
 	}
+	leftSegments = append(leftSegments, saving)
+
+	// Right segments
+
+	rightSegments := []string{}
+
+	if m.elapsed > 0 && m.tokenCount > 0 {
+		throughput := fmt.Sprintf("%.0f t/sec", float64(m.tokenCount)/m.elapsed.Seconds())
+		rightSegments = append(rightSegments, segmentStyle.Render(throughput))
+	}
+	model := segmentStyle.Render(m.App.ActiveModel(lipgloss.NewStyle()))
+	rightSegments = append(rightSegments, model)
+
+	// Status
 
 	var status string
 	switch m.state {
@@ -277,39 +295,62 @@ func (m *Model) Footer(width int) string {
 		status = "Press ctrl+s to send"
 	}
 
-	leftSegments := []string{
-		saving,
-		segmentStyle.Render(status),
-	}
-	rightSegments := []string{}
-
-	if m.elapsed > 0 && m.tokenCount > 0 {
-		throughput := fmt.Sprintf("%.0f t/sec", float64(m.tokenCount)/m.elapsed.Seconds())
-		rightSegments = append(rightSegments, segmentStyle.Render(throughput))
+	return m.layoutFooter(width, leftSegments, status, rightSegments, segmentStyle, segmentSeparator)
 }
 
-	if m.App.ProviderName != "" {
-		provider := fmt.Sprintf("Provider: %s", m.App.ProviderName)
-		rightSegments = append(rightSegments, segmentStyle.Render(provider))
+func (m *Model) layoutFooter(
+	width int,
+	leftSegments []string,
+	status string,
+	rightSegments []string,
+	segmentStyle lipgloss.Style,
+	segmentSeparator string,
+) string {
+	truncate := func(s string, w int) string {
+		return tuiutil.TruncateToCellWidth(s, w, "...")
 	}
-
-	model := fmt.Sprintf("Model: %s", m.App.Model)
-	rightSegments = append(rightSegments, segmentStyle.Render(model))
+	padWidth := segmentStyle.GetHorizontalPadding()
 
 	left := strings.Join(leftSegments, segmentSeparator)
 	right := strings.Join(rightSegments, segmentSeparator)
 
-	totalWidth := lipgloss.Width(left) + lipgloss.Width(right)
-	remaining := width - totalWidth
+	leftWidth := tuiutil.Width(left)
+	rightWidth := tuiutil.Width(right)
 
-	var padding string
-	if remaining > 0 {
-		padding = strings.Repeat(" ", remaining)
+	availableWidth := width - leftWidth - rightWidth - tuiutil.Width(segmentSeparator)
+
+	statusWidth := tuiutil.Width(status)
+	if availableWidth >= statusWidth+padWidth {
+		// Everything fits
+		availableWidth -= statusWidth + padWidth
+		padding := ""
+		if availableWidth > 0 {
+			padding = strings.Repeat(" ", availableWidth)
+		}
+		return footerStyle.Render(left + segmentSeparator + segmentStyle.Render(status) + padding + right)
 	}
 
-	footer := left + padding + right
-	if remaining < 0 {
-		footer = tuiutil.TruncateToCellWidth(footer, width, "...")
+	if availableWidth > 4 {
+		// There is some space left for a truncated status
+		truncatedStatus := truncate(status, availableWidth-padWidth)
+		return footerStyle.Width(width).Render(left + segmentSeparator + segmentStyle.Render(truncatedStatus) + right)
 	}
-	return footerStyle.Width(width).Render(footer)
+
+	if availableWidth >= 0 {
+		// Draw some dots...
+		dots := ""
+		if availableWidth == 1 {
+			dots = " "
+		} else if availableWidth > 1 {
+			dots = " " + strings.Repeat(".", availableWidth-1)
+			dots = lipgloss.NewStyle().Faint(true).Render(dots)
+		}
+
+		return footerStyle.Width(width).Render(left + segmentSeparator + dots + right)
+	}
+
+	// Trucate right segment so it fits
+	right = truncate(right, tuiutil.Width(right)+availableWidth-1)
+	padding := ""
+	return footerStyle.Width(width).Render(left + segmentSeparator + padding + right)
 }