Mirror the panel in the console table as one summed row in two sections

render.go

@@ -111,6 +111,7 @@ func scaleTime(d time.Duration) string {
 }
 
 type colSpec struct {
+	group string
 	title string
 	width int
 	right bool
@@ -122,15 +123,33 @@ type streamTable struct {
 	headerEvery int
 }
 
+// A group change is drawn as a vertical break, so the two halves of the row
+// read apart without a second header line naming them.
+func (t *streamTable) join(cells []string, brk string) string {
+	var b strings.Builder
+	for i, c := range cells {
+		if i > 0 {
+			if t.cols[i].group != t.cols[i-1].group {
+				b.WriteString(brk)
+			} else {
+				b.WriteByte(' ')
+			}
+		}
+		b.WriteString(c)
+	}
+	return b.String()
+}
+
 func (t *streamTable) headerLines() []string {
-	var titles, rules []string
-	for _, c := range t.cols {
-		titles = append(titles, pad(c.title, c.width, c.right))
-		rules = append(rules, strings.Repeat("─", c.width))
+	titles := make([]string, len(t.cols))
+	rules := make([]string, len(t.cols))
+	for i, c := range t.cols {
+		titles[i] = paint(pad(c.title, c.width, c.right), cBold)
+		rules[i] = strings.Repeat("─", c.width)
 	}
 	return []string{
-		paint(strings.Join(titles, " "), cBold),
-		paint(strings.Join(rules, " "), cGrey),
+		t.join(titles, paint(" │ ", cGrey)),
+		paint(t.join(rules, "─┼─"), cGrey),
 	}
 }
 
@@ -140,6 +159,9 @@ func (t *streamTable) width() int {
 		w += c.width
 		if i > 0 {
 			w++
+			if t.cols[i].group != t.cols[i-1].group {
+				w += 2
+			}
 		}
 	}
 	return w
@@ -174,7 +196,7 @@ func (t *streamTable) emit(cells []string) []string {
 		padded = append(padded, pad(v, c.width, c.right))
 	}
 	t.sinceHeader++
-	return append(out, strings.Join(padded, " "))
+	return append(out, t.join(padded, paint(" │ ", cGrey)))
 }
 
 func renderBox(title string, headers []string, rights []bool, rows [][]string) string {
@@ -232,6 +254,15 @@ func renderBox(title string, headers []string, rights []bool, rows [][]string) s
 	return b.String()
 }
 
+// Whether rather than how many, matching the panel's top chips: over a window
+// this short a count changes faster than it can be read.
+func flagCell(v uint64) string {
+	if v == 0 {
+		return paint("ok", cGreen)
+	}
+	return paint("ERR", cRed)
+}
+
 // Exact rather than scaled: scaled, one lost frame and a thousand both read as
 // 1.00, separated only by a letter.
 func statusCell(v uint64) string {