add more metrics that only appear when a print job is running

main_test.go

@@ -0,0 +1,24 @@
+package main
+
+import (
+	"testing"
+	"time"
+)
+
+func TestParseDuration(t *testing.T) {
+	d := parseDuration("     45s")
+	if d != (45 * time.Second) {
+		t.Log(d)
+		t.Fail()
+	}
+	d = parseDuration("   10m 45s")
+	if d != (45*time.Second)+(10*time.Minute) {
+		t.Log(d)
+		t.Fail()
+	}
+	d = parseDuration(" 12h 10m 45s")
+	if d != (12*time.Hour)+(45*time.Second)+(10*time.Minute) {
+		t.Log(d)
+		t.Fail()
+	}
+}