flamegraph: show selected height metric in status line (zo)

2 files changed, 41 insertions, 1 deletions

diff --git a/internal/tui/flamegraph/controls.go b/internal/tui/flamegraph/controls.go
index c9e5484..7eee102 100644
--- a/internal/tui/flamegraph/controls.go
+++ b/internal/tui/flamegraph/controls.go
@@ -156,7 +156,7 @@ func (m Model) selectionStatusLine() string {
 		mode = "PAUSED"
 	}
 	heightLabel := ""
-	if m.heightField != "" {
+	if m.heightMetricActive() {
 		heightLabel = " | height:" + m.heightFieldLabel()
 	}
 	if len(m.frames) == 0 {
@@ -168,6 +168,16 @@ func (m Model) selectionStatusLine() string {
 		selIdx = 0
 	}
 	frame := m.frames[selIdx]
+	if m.heightMetricActive() {
+		maxHeightTotal := uint64(0)
+		for i := range m.frames {
+			if m.frames[i].HeightTotal > maxHeightTotal {
+				maxHeightTotal = m.frames[i].HeightTotal
+			}
+		}
+		heightShare := percentOfTotal(frame.HeightTotal, maxHeightTotal)
+		heightLabel = fmt.Sprintf(" | height(%s)=%d (%.1f%% of max)", m.heightFieldLabel(), frame.HeightTotal, heightShare)
+	}
 	systemShare := frame.Percent
 	if m.globalTotal > 0 {
 		systemShare = percentOfTotal(frame.Total, m.globalTotal)
diff --git a/internal/tui/flamegraph/model_test.go b/internal/tui/flamegraph/model_test.go
index c5da062..80a86bb 100644
--- a/internal/tui/flamegraph/model_test.go
+++ b/internal/tui/flamegraph/model_test.go
@@ -890,6 +890,36 @@ func TestViewSelectionStatusUsesBytesLabelInBytesMode(t *testing.T) {
 	}
 }
 
+func TestSelectionStatusLineIncludesSelectedHeightValueAndMaxShare(t *testing.T) {
+	m := NewModel(nil)
+	m.width = 220
+	m.height = 20
+	m.heightField = "duration"
+	m.frames = []tuiFrame{
+		{Name: "root", Depth: 0, Col: 0, Row: 0, Width: 120, Total: 100, Percent: 100, Path: "root", HeightTotal: 200},
+		{Name: "child", Depth: 1, Col: 0, Row: 1, Width: 60, Total: 40, Percent: 40, Path: "root" + pathSeparator + "child", HeightTotal: 50},
+	}
+	m.selectedIdx = 1
+	m.globalTotal = 100
+
+	line := m.selectionStatusLine()
+	if !strings.Contains(line, "height(duration)=50 (25.0% of max)") {
+		t.Fatalf("expected selected height metric fragment, got %q", line)
+	}
+}
+
+func TestSelectionStatusLineUsesHeightLabelWithoutSelectedValueWhenNoSelection(t *testing.T) {
+	m := NewModel(nil)
+	m.width = 220
+	m.height = 20
+	m.heightField = "duration"
+
+	line := m.selectionStatusLine()
+	if !strings.Contains(line, "height:duration") {
+		t.Fatalf("expected height field label without selected value when no frames, got %q", line)
+	}
+}
+
 func TestViewFitsViewportHeightAndKeepsSearchFooterVisible(t *testing.T) {
 	m := NewModel(nil)
 	m.width = 100