Add TimeSince

diff --git a/modules/base/tool.go b/modules/base/tool.go
index eef473f965f719e9419a671757f742d34ef2c94f..445833cebca942251a487347a4b4255fd7a219c5 100644 (file)
--- a/modules/base/tool.go
+++ b/modules/base/tool.go
@@ -7,6 +7,8 @@ package base
 import (
        "crypto/md5"
        "encoding/hex"
+       "fmt"
+       "time"
 )
 
 // Encode string to md5 hex value
@@ -15,3 +17,64 @@ func EncodeMd5(str string) string {
        m.Write([]byte(str))
        return hex.EncodeToString(m.Sum(nil))
 }
+
+// Seconds-based time units
+const (
+       Minute = 60
+       Hour   = 60 * Minute
+       Day    = 24 * Hour
+       Week   = 7 * Day
+       Month  = 30 * Day
+       Year   = 12 * Month
+)
+
+// TimeSince calculates the time interval and generate user-friendly string.
+func TimeSince(then time.Time) string {
+       now := time.Now()
+
+       lbl := "ago"
+       diff := now.Unix() - then.Unix()
+       if then.After(now) {
+               lbl = "from now"
+               diff = then.Unix() - now.Unix()
+       }
+
+       switch {
+
+       case diff <= 0:
+               return "now"
+       case diff <= 2:
+               return fmt.Sprintf("1 second %s", lbl)
+       case diff < 1*Minute:
+               return fmt.Sprintf("%d seconds %s", diff, lbl)
+
+       case diff < 2*Minute:
+               return fmt.Sprintf("1 minute %s", lbl)
+       case diff < 1*Hour:
+               return fmt.Sprintf("%d minutes %s", diff/Minute, lbl)
+
+       case diff < 2*Hour:
+               return fmt.Sprintf("1 hour %s", lbl)
+       case diff < 1*Day:
+               return fmt.Sprintf("%d hours %s", diff/Hour, lbl)
+
+       case diff < 2*Day:
+               return fmt.Sprintf("1 day %s", lbl)
+       case diff < 1*Week:
+               return fmt.Sprintf("%d days %s", diff/Day, lbl)
+
+       case diff < 2*Week:
+               return fmt.Sprintf("1 week %s", lbl)
+       case diff < 1*Month:
+               return fmt.Sprintf("%d weeks %s", diff/Week, lbl)
+
+       case diff < 2*Month:
+               return fmt.Sprintf("1 month %s", lbl)
+       case diff < 1*Year:
+               return fmt.Sprintf("%d months %s", diff/Month, lbl)
+
+       case diff < 18*Month:
+               return fmt.Sprintf("1 year %s", lbl)
+       }
+       return then.String()
+}