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