internal/tui/chart.go

@@ -0,0 +1,132 @@
+package tui
+
+import (
+	"fmt"
+	"strings"
+	"time"
+)
+
+func (m Model) latencyChart(latencies []time.Duration, statuses []bool, width, height int) string {
+	if len(latencies) == 0 || width < 20 || height < 1 {
+		return ""
+	}
+
+	var minMs, maxMs, sumMs int64
+	minMs = latencies[0].Milliseconds()
+	maxMs = minMs
+	upCount := 0
+	for i, l := range latencies {
+		ms := l.Milliseconds()
+		if i < len(statuses) && !statuses[i] {
+			continue
+		}
+		if ms < minMs {
+			minMs = ms
+		}
+		if ms > maxMs {
+			maxMs = ms
+		}
+		sumMs += ms
+		upCount++
+	}
+	var avgMs int64
+	if upCount > 0 {
+		avgMs = sumMs / int64(upCount)
+	}
+
+	maxLabel := fmt.Sprintf("%dms", maxMs)
+	minLabel := fmt.Sprintf("%dms", minMs)
+	labelW := len(maxLabel)
+	if len(minLabel) > labelW {
+		labelW = len(minLabel)
+	}
+	labelW += 1
+
+	chartW := width - labelW
+	if chartW > len(latencies) {
+		chartW = len(latencies)
+	}
+	if chartW < 10 {
+		chartW = 10
+	}
+
+	samples := latencies
+	sampledStatuses := statuses
+	if len(samples) > chartW {
+		samples = samples[len(samples)-chartW:]
+		if len(sampledStatuses) > chartW {
+			sampledStatuses = sampledStatuses[len(sampledStatuses)-chartW:]
+		}
+	}
+
+	spread := maxMs - minMs
+	if spread == 0 {
+		spread = 1
+	}
+	totalLevels := height * 8
+
+	levels := make([]int, len(samples))
+	for i, l := range samples {
+		ms := l.Milliseconds()
+		if i < len(sampledStatuses) && !sampledStatuses[i] {
+			levels[i] = 0
+			continue
+		}
+		lvl := int(float64(ms-minMs) / float64(spread) * float64(totalLevels-1))
+		if lvl < 1 && ms > 0 {
+			lvl = 1
+		}
+		if lvl >= totalLevels {
+			lvl = totalLevels - 1
+		}
+		levels[i] = lvl
+	}
+
+	labelStyle := m.st.subtleStyle
+
+	var rows []string
+	for row := height - 1; row >= 0; row-- {
+		var label string
+		switch row {
+		case height - 1:
+			label = fmt.Sprintf("%*s", labelW, maxLabel)
+		case 0:
+			label = fmt.Sprintf("%*s", labelW, minLabel)
+		default:
+			label = strings.Repeat(" ", labelW)
+		}
+
+		var sb strings.Builder
+		sb.WriteString(labelStyle.Render(label))
+
+		rowBase := row * 8
+		for i := range samples {
+			fill := levels[i] - rowBase
+			if fill <= 0 {
+				sb.WriteString(" ")
+				continue
+			}
+			if fill > 8 {
+				fill = 8
+			}
+			ch := string(sparkChars[fill-1])
+
+			isDown := i < len(sampledStatuses) && !sampledStatuses[i]
+			if isDown {
+				sb.WriteString(m.st.dangerStyle.Render(ch))
+			} else {
+				sb.WriteString(m.latencyStyle(samples[i].Milliseconds(), nil).Render(ch))
+			}
+		}
+		rows = append(rows, sb.String())
+	}
+
+	stats := fmt.Sprintf("%*s Min %s  Avg %s  Max %s",
+		labelW, "",
+		m.fmtLatency(time.Duration(minMs)*time.Millisecond),
+		m.fmtLatency(time.Duration(avgMs)*time.Millisecond),
+		m.fmtLatency(time.Duration(maxMs)*time.Millisecond))
+	rows = append(rows, stats)
+
+	return strings.Join(rows, "\n")
+}

internal/tui/update.go

@@ -142,7 +142,7 @@ func (m *Model) handleFormMsg(msg tea.Msg) (tea.Model, tea.Cmd) {
 	return m, nil
 }
 
-const detailInlineHeight = 8
+const detailInlineHeight = 11
 
 func (m *Model) recalcLayout() {
 	chrome := chromeBase

internal/tui/view_detail_inline.go

@@ -67,33 +67,14 @@ func (m Model) viewDetailInline(width int) string {
 	}
 
 	if len(hist.Latencies) > 0 {
-		sparkW := width - 30
-		if sparkW < 10 {
-			sparkW = 10
+		chartW := width - 4
+		if chartW < 20 {
+			chartW = 20
 		}
-		if sparkW > detailSparkWidth {
-			sparkW = detailSparkWidth
+		chart := m.latencyChart(hist.Latencies, hist.Statuses, chartW, 3)
+		if chart != "" {
+			b.WriteString(chart + "\n")
 		}
-		spark := m.latencySparkline(hist.Latencies, hist.Statuses, sparkW, m.theme.Bg)
-		minMs := hist.Latencies[0].Milliseconds()
-		maxMs := hist.Latencies[0].Milliseconds()
-		var sumMs int64
-		for _, l := range hist.Latencies {
-			ms := l.Milliseconds()
-			if ms < minMs {
-				minMs = ms
-			}
-			if ms > maxMs {
-				maxMs = ms
-			}
-			sumMs += ms
-		}
-		avgMs := sumMs / int64(len(hist.Latencies))
-		stats := fmt.Sprintf("Min %s  Avg %s  Max %s",
-			m.fmtLatency(time.Duration(minMs)*time.Millisecond),
-			m.fmtLatency(time.Duration(avgMs)*time.Millisecond),
-			m.fmtLatency(time.Duration(maxMs)*time.Millisecond))
-		b.WriteString("  " + spark + "  " + stats + "\n")
 	}
 
 	keys := m.st.subtleStyle.Render("[h] History  [s] SLA  [e] Edit  [esc] Close")