Migrate to golang1.5 release with GO15VENDOREXPERIMENT=1 enabled

vendor/github.com/dustin/go-humanize/times.go

@@ -0,0 +1,91 @@
+package humanize
+
+import (
+	"fmt"
+	"math"
+	"sort"
+	"time"
+)
+
+// Seconds-based time units
+const (
+	Minute   = 60
+	Hour     = 60 * Minute
+	Day      = 24 * Hour
+	Week     = 7 * Day
+	Month    = 30 * Day
+	Year     = 12 * Month
+	LongTime = 37 * Year
+)
+
+// Time formats a time into a relative string.
+//
+// Time(someT) -> "3 weeks ago"
+func Time(then time.Time) string {
+	return RelTime(then, time.Now(), "ago", "from now")
+}
+
+var magnitudes = []struct {
+	d      int64
+	format string
+	divby  int64
+}{
+	{1, "now", 1},
+	{2, "1 second %s", 1},
+	{Minute, "%d seconds %s", 1},
+	{2 * Minute, "1 minute %s", 1},
+	{Hour, "%d minutes %s", Minute},
+	{2 * Hour, "1 hour %s", 1},
+	{Day, "%d hours %s", Hour},
+	{2 * Day, "1 day %s", 1},
+	{Week, "%d days %s", Day},
+	{2 * Week, "1 week %s", 1},
+	{Month, "%d weeks %s", Week},
+	{2 * Month, "1 month %s", 1},
+	{Year, "%d months %s", Month},
+	{18 * Month, "1 year %s", 1},
+	{2 * Year, "2 years %s", 1},
+	{LongTime, "%d years %s", Year},
+	{math.MaxInt64, "a long while %s", 1},
+}
+
+// RelTime formats a time into a relative string.
+//
+// It takes two times and two labels.  In addition to the generic time
+// delta string (e.g. 5 minutes), the labels are used applied so that
+// the label corresponding to the smaller time is applied.
+//
+// RelTime(timeInPast, timeInFuture, "earlier", "later") -> "3 weeks earlier"
+func RelTime(a, b time.Time, albl, blbl string) string {
+	lbl := albl
+	diff := b.Unix() - a.Unix()
+
+	after := a.After(b)
+	if after {
+		lbl = blbl
+		diff = a.Unix() - b.Unix()
+	}
+
+	n := sort.Search(len(magnitudes), func(i int) bool {
+		return magnitudes[i].d > diff
+	})
+
+	mag := magnitudes[n]
+	args := []interface{}{}
+	escaped := false
+	for _, ch := range mag.format {
+		if escaped {
+			switch ch {
+			case '%':
+			case 's':
+				args = append(args, lbl)
+			case 'd':
+				args = append(args, diff/mag.divby)
+			}
+			escaped = false
+		} else {
+			escaped = ch == '%'
+		}
+	}
+	return fmt.Sprintf(mag.format, args...)
+}