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timeago.go
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timeago.go
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// Copyright 2013 Simon HEGE. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
//timeago allows the formatting of time in terms of fuzzy timestamps.
//For example:
// one minute ago
// 3 years ago
// in 2 minutes
package timeago
import (
"fmt"
"strings"
"time"
)
const (
Day time.Duration = time.Hour * 24
Month time.Duration = Day * 30
Year time.Duration = Day * 365
)
type FormatPeriod struct {
D time.Duration
One string
Many string
}
//Config allows the customization of timeago.
//You may configure string items (language, plurals, ...) and
//maximum allowed duration value for fuzzy formatting.
type Config struct {
PastPrefix string
PastSuffix string
FuturePrefix string
FutureSuffix string
Periods []FormatPeriod
Zero string
Max time.Duration //Maximum duration for using the special formatting.
//DefaultLayout is used if delta is greater than the minimum of last period
//in Periods and Max. It is the desired representation of the date 2nd of
// January 2006.
DefaultLayout string
}
//Predefined english configuration
var English = Config{
PastPrefix: "",
PastSuffix: " ago",
FuturePrefix: "in ",
FutureSuffix: "",
Periods: []FormatPeriod{
{time.Second, "about a second", "%d seconds"},
{time.Minute, "about a minute", "%d minutes"},
{time.Hour, "about an hour", "%d hours"},
{Day, "one day", "%d days"},
{Month, "one month", "%d months"},
{Year, "one year", "%d years"},
},
Zero: "about a second",
Max: 73 * time.Hour,
DefaultLayout: "2006-01-02",
}
var Portuguese = Config{
PastPrefix: "há ",
PastSuffix: "",
FuturePrefix: "daqui a ",
FutureSuffix: "",
Periods: []FormatPeriod{
{time.Second, "um segundo", "%d segundos"},
{time.Minute, "um minuto", "%d minutos"},
{time.Hour, "uma hora", "%d horas"},
{Day, "um dia", "%d dias"},
{Month, "um mês", "%d meses"},
{Year, "um ano", "%d anos"},
},
Zero: "menos de um segundo",
Max: 73 * time.Hour,
DefaultLayout: "02-01-2006",
}
var Spanish = Config{
PastPrefix: "hace ",
PastSuffix: "",
FuturePrefix: "en ",
FutureSuffix: "",
Periods: []FormatPeriod{
{time.Second, "un segundo", "%d segundos"},
{time.Minute, "un minuto", "%d minutos"},
{time.Hour, "una hora", "%d horas"},
{Day, "un día", "%d días"},
{Month, "un mes", "%d meses"},
{Year, "un año", "%d años"},
},
Zero: "menos de un segundo",
Max: 73 * time.Hour,
DefaultLayout: "02-01-2006",
}
var Chinese = Config{
PastPrefix: "",
PastSuffix: "前",
FuturePrefix: "于 ",
FutureSuffix: "",
Periods: []FormatPeriod{
{time.Second, "1 秒", "%d 秒"},
{time.Minute, "1 分钟", "%d 分钟"},
{time.Hour, "1 小时", "%d 小时"},
{Day, "1 天", "%d 天"},
{Month, "1 月", "%d 月"},
{Year, "1 年", "%d 年"},
},
Zero: "1 秒",
Max: 73 * time.Hour,
DefaultLayout: "2006-01-02",
}
//Predefined french configuration
var French = Config{
PastPrefix: "il y a ",
PastSuffix: "",
FuturePrefix: "dans ",
FutureSuffix: "",
Periods: []FormatPeriod{
{time.Second, "environ une seconde", "moins d'une minute"},
{time.Minute, "environ une minute", "%d minutes"},
{time.Hour, "environ une heure", "%d heures"},
{Day, "un jour", "%d jours"},
{Month, "un mois", "%d mois"},
{Year, "un an", "%d ans"},
},
Zero: "environ une seconde",
Max: 73 * time.Hour,
DefaultLayout: "02/01/2006",
}
//Predefined german configuration
var German = Config{
PastPrefix: "vor ",
PastSuffix: "",
FuturePrefix: "in ",
FutureSuffix: "",
Periods: []FormatPeriod{
{time.Second, "einer Sekunde", "%d Sekunden"},
{time.Minute, "einer Minute", "%d Minuten"},
{time.Hour, "einer Stunde", "%d Stunden"},
{Day, "einem Tag", "%d Tagen"},
{Month, "einem Monat", "%d Monaten"},
{Year, "einem Jahr", "%d Jahren"},
},
Zero: "einer Sekunde",
Max: 73 * time.Hour,
DefaultLayout: "02.01.2006",
}
//Predefined turkish configuration
var Turkish = Config{
PastPrefix: "",
PastSuffix: " önce",
FuturePrefix: "",
FutureSuffix: " içinde",
Periods: []FormatPeriod{
{time.Second, "yaklaşık bir saniye", "%d saniye"},
{time.Minute, "yaklaşık bir dakika", "%d dakika"},
{time.Hour, "yaklaşık bir saat", "%d saat"},
{Day, "bir gün", "%d gün"},
{Month, "bir ay", "%d ay"},
{Year, "bir yıl", "%d yıl"},
},
Zero: "yaklaşık bir saniye",
Max: 73 * time.Hour,
DefaultLayout: "02/01/2006",
}
// Korean support
var Korean = Config{
PastPrefix: "",
PastSuffix: " 전",
FuturePrefix: "",
FutureSuffix: " 후",
Periods: []FormatPeriod{
{time.Second, "약 1초", "%d초"},
{time.Minute, "약 1분", "%d분"},
{time.Hour, "약 한시간", "%d시간"},
{Day, "하루", "%d일"},
{Month, "1개월", "%d개월"},
{Year, "1년", "%d년"},
},
Zero: "방금",
Max: 10 * 365 * 24 * time.Hour,
DefaultLayout: "2006-01-02",
}
//Format returns a textual representation of the time value formatted according to the layout
//defined in the Config. The time is compared to time.Now() and is then formatted as a fuzzy
//timestamp (eg. "4 days ago")
func (cfg Config) Format(t time.Time) string {
return cfg.FormatReference(t, time.Now())
}
//FormatReference is the same as Format, but the reference has to be defined by the caller
func (cfg Config) FormatReference(t time.Time, reference time.Time) string {
d := reference.Sub(t)
if (d >= 0 && d >= cfg.Max) || (d < 0 && -d >= cfg.Max) {
return t.Format(cfg.DefaultLayout)
}
return cfg.FormatRelativeDuration(d)
}
//FormatRelativeDuration is the same as Format, but for time.Duration.
//Config.Max is not used in this function, as there is no other alternative.
func (cfg Config) FormatRelativeDuration(d time.Duration) string {
isPast := d >= 0
if d < 0 {
d = -d
}
s, _ := cfg.getTimeText(d, true)
if isPast {
return strings.Join([]string{cfg.PastPrefix, s, cfg.PastSuffix}, "")
} else {
return strings.Join([]string{cfg.FuturePrefix, s, cfg.FutureSuffix}, "")
}
}
//Round the duration d in terms of step.
func round(d time.Duration, step time.Duration, roundCloser bool) time.Duration {
if roundCloser {
return time.Duration(float64(d)/float64(step) + 0.5)
}
return time.Duration(float64(d) / float64(step))
}
//Count the number of parameters in a format string
func nbParamInFormat(f string) int {
return strings.Count(f, "%") - 2*strings.Count(f, "%%")
}
//Convert a duration to a text, based on the current config
func (cfg Config) getTimeText(d time.Duration, roundCloser bool) (string, time.Duration) {
if len(cfg.Periods) == 0 || d < cfg.Periods[0].D {
return cfg.Zero, 0
}
for i, p := range cfg.Periods {
next := p.D
if i+1 < len(cfg.Periods) {
next = cfg.Periods[i+1].D
}
if i+1 == len(cfg.Periods) || d < next {
r := round(d, p.D, roundCloser)
if next != p.D && r == round(next, p.D, roundCloser) {
continue
}
if r == 0 {
return "", d
}
layout := p.Many
if r == 1 {
layout = p.One
}
if nbParamInFormat(layout) == 0 {
return layout, d - r*p.D
}
return fmt.Sprintf(layout, r), d - r*p.D
}
}
return d.String(), 0
}
//NoMax creates an new config without a maximum
func NoMax(cfg Config) Config {
return WithMax(cfg, 9223372036854775807, time.RFC3339)
}
//WithMax creates an new config with special formatting limited to durations less than max.
//Values greater than max will be formatted by the standard time package using the defaultLayout.
func WithMax(cfg Config, max time.Duration, defaultLayout string) Config {
n := cfg
n.Max = max
n.DefaultLayout = defaultLayout
return n
}