copy langext & termext from ffsclient

timeext/duration.go

@@ -1,6 +1,9 @@
 package timeext
 
-import "time"
+import (
+	"fmt"
+	"time"
+)
 
 func FromSeconds(v int) time.Duration {
 	return time.Duration(int64(v) * int64(time.Second))
@@ -53,3 +56,36 @@ func FromMilliseconds(v int) time.Duration {
 func FromMillisecondsFloat(v float64) time.Duration {
 	return time.Duration(int64(v * float64(time.Millisecond)))
 }
+
+func FormatNaturalDurationEnglish(iv time.Duration) string {
+	if sec := int64(iv.Seconds()); sec < 180 {
+		if sec == 1 {
+			return "1 second ago"
+		} else {
+			return fmt.Sprintf("%d seconds ago", sec)
+		}
+	}
+
+	if min := int64(iv.Minutes()); min < 180 {
+		return fmt.Sprintf("%d minutes ago", min)
+	}
+
+	if hours := int64(iv.Hours()); hours < 72 {
+		return fmt.Sprintf("%d hours ago", hours)
+	}
+
+	if days := int64(iv.Hours() / 24.0); days < 21 {
+		return fmt.Sprintf("%d days ago", days)
+	}
+
+	if weeks := int64(iv.Hours() / 24.0 / 7.0); weeks < 12 {
+		return fmt.Sprintf("%d weeks ago", weeks)
+	}
+
+	if months := int64(iv.Hours() / 24.0 / 7.0 / 30); months < 36 {
+		return fmt.Sprintf("%d months ago", months)
+	}
+
+	years := int64(iv.Hours() / 24.0 / 7.0 / 365)
+	return fmt.Sprintf("%d years ago", years)
+}