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118 lines
3.2 KiB
Go
118 lines
3.2 KiB
Go
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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Day = 24 * time.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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// A RelTimeMagnitude struct contains a relative time point at which
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// the relative format of time will switch to a new format string. A
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// slice of these in ascending order by their "D" field is passed to
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// CustomRelTime to format durations.
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//
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// The Format field is a string that may contain a "%s" which will be
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// replaced with the appropriate signed label (e.g. "ago" or "from
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// now") and a "%d" that will be replaced by the quantity.
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//
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// The DivBy field is the amount of time the time difference must be
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// divided by in order to display correctly.
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//
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// e.g. if D is 2*time.Minute and you want to display "%d minutes %s"
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// DivBy should be time.Minute so whatever the duration is will be
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// expressed in minutes.
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type RelTimeMagnitude struct {
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D time.Duration
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Format string
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DivBy time.Duration
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}
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var defaultMagnitudes = []RelTimeMagnitude{
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{time.Second, "now", time.Second},
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{2 * time.Second, "1 second %s", 1},
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{time.Minute, "%d seconds %s", time.Second},
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{2 * time.Minute, "1 minute %s", 1},
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{time.Hour, "%d minutes %s", time.Minute},
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{2 * time.Hour, "1 hour %s", 1},
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{Day, "%d hours %s", time.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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return CustomRelTime(a, b, albl, blbl, defaultMagnitudes)
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}
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// CustomRelTime formats a time into a relative string.
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//
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// It takes two times two labels and a table of relative time formats.
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// In addition to the generic time delta string (e.g. 5 minutes), the
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// labels are used applied so that the label corresponding to the
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// smaller time is applied.
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func CustomRelTime(a, b time.Time, albl, blbl string, magnitudes []RelTimeMagnitude) string {
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lbl := albl
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diff := b.Sub(a)
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if a.After(b) {
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lbl = blbl
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diff = a.Sub(b)
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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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if n >= len(magnitudes) {
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n = len(magnitudes) - 1
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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 '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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