Draw the counter reset as a labelled rule across the table

render.go

@@ -111,6 +111,31 @@ func (t *streamTable) headerLines() []string {
 	}
 }
 
+func (t *streamTable) width() int {
+	w := 0
+	for i, c := range t.cols {
+		w += c.width
+		if i > 0 {
+			w++
+		}
+	}
+	return w
+}
+
+// A labelled horizontal rule spanning the table, for marking a break in the
+// stream of rows.
+func (t *streamTable) rule(label string) string {
+	const lead = 3
+	text := " " + label + " "
+	trail := t.width() - lead - visWidth(text)
+	if trail < 0 {
+		trail = 0
+	}
+	return paint(strings.Repeat("─", lead), cGrey) +
+		paint(text, cDim) +
+		paint(strings.Repeat("─", trail), cGrey)
+}
+
 func (t *streamTable) emit(cells []string) []string {
 	var out []string
 	if t.sinceHeader == 0 || (t.headerEvery > 0 && t.sinceHeader >= t.headerEvery) {