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timeago.go
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timeago.go
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package timeago
import (
"bytes"
"fmt"
"math"
"time"
)
const (
minute = 1
hour = minute * 60
day = hour * 24
month = day * 30
year = day * 365
quarter = year / 4
)
// FromDuration returns a friendly string representing an approximation of the
// given duration
func FromDuration(d time.Duration) string {
seconds := round(d.Seconds())
if seconds < 30 {
return "less than a minute"
}
if seconds < 90 {
return "1 minute"
}
minutes := div(seconds, 60)
if minutes < 45 {
return fmt.Sprintf("%0d minutes", minutes)
}
hours := div(minutes, 60)
if minutes < day {
return fmt.Sprintf("about %s", pluralize(hours, "hour"))
}
if minutes < (42 * hour) {
return "1 day"
}
days := div(hours, 24)
if minutes < (30 * day) {
return pluralize(days, "day")
}
months := div(days, 30)
if minutes < (45 * day) {
return "about 1 month"
}
if minutes < (60 * day) {
return "about 2 months"
}
if minutes < year {
return pluralize(months, "month")
}
rem := minutes % year
years := minutes / year
if rem < (3 * month) {
return fmt.Sprintf("about %s", pluralize(years, "year"))
}
if rem < (9 * month) {
return fmt.Sprintf("over %s", pluralize(years, "year"))
}
years++
return fmt.Sprintf("almost %s", pluralize(years, "year"))
}
// FromTime returns a friendly string representing the approximate difference
// from the given time and time.Now()
func FromTime(t time.Time) string {
now := time.Now()
var d time.Duration
var suffix string
if t.Before(now) {
d = now.Sub(t)
suffix = "ago"
} else {
d = t.Sub(now)
suffix = "from now"
}
return fmt.Sprintf("%s %s", FromDuration(d), suffix)
}
func pluralize(i int, s string) string {
var buf bytes.Buffer
buf.WriteString(fmt.Sprintf("%d %s", i, s))
if i != 1 {
buf.WriteString("s")
}
return buf.String()
}
func round(f float64) int {
return int(math.Floor(f + .50))
}
func div(numerator int, denominator int) int {
rem := numerator % denominator
result := numerator / denominator
if rem >= (denominator / 2) {
result++
}
return result
}