Make short duration formatter re-useable

tools/utils/humanize/times_test.go

@@ -0,0 +1,35 @@
+// License: GPLv3 Copyright: 2023, Kovid Goyal, <kovid at kovidgoyal.net>
+
+package humanize
+
+import (
+	"fmt"
+	"testing"
+	"time"
+
+	"github.com/google/go-cmp/cmp"
+)
+
+var _ = fmt.Print
+
+func TestShortDuration(t *testing.T) {
+	q := func(i float64, e string) {
+		d := time.Duration(i * float64(time.Second))
+		if diff := cmp.Diff(e, ShortDuration(d)); diff != "" {
+			t.Fatalf("Failed for %f (%s): %s", i, d, diff)
+		}
+	}
+	q(0.1, "  <1 sec")
+	q(1, `00:00:01`)
+	q(1.1234567, `00:00:01`)
+	q(60.1234567, `00:01:00`)
+	q(61.1234567, `00:01:01`)
+	q(3600, `01:00:00`)
+	q(3601.1234567, `01:00:01`)
+	day := 24. * 3600.
+	q(day, "24:00:00")
+	q(day+1, "  >1 day")
+	q(day*2, " >2 days")
+	q(day*23, ">23 days")
+	q(day*999, "       ∞")
+}