WIP: iterative buildCells rewrite

cmd/qrunproxy/timeline_test.go

@@ -18,7 +18,7 @@ func TestBuildTimelineFromMockShow(t *testing.T) {
 	t.Logf("Validate: %v", time.Since(t1))
 
 	t2 := time.Now()
-	tl, err := BuildTimeline(show)
+	tl, err := BuildTimelineDebug(show, &testWriter{t})
 	t.Logf("BuildTimeline: %v", time.Since(t2))
 	if err != nil {
 		t.Fatalf("BuildTimeline failed: %v", err)
@@ -26,6 +26,13 @@ func TestBuildTimelineFromMockShow(t *testing.T) {
 	t.Logf("tracks=%d blocks=%d", len(tl.Tracks), len(tl.Blocks))
 }
 
+type testWriter struct{ t *testing.T }
+
+func (w *testWriter) Write(p []byte) (int, error) {
+	w.t.Log(string(p))
+	return len(p), nil
+}
+
 func BenchmarkBuildTimeline(b *testing.B) {
 	show := GenerateMockShow(42, 5, 20, 4, 5)
 	if err := show.Validate(); err != nil {