added timeago to funcmap

funcmap.go

@@ -46,6 +46,7 @@ var Funcs = map[string]interface{}{
 	"stat":         Stat,
 	"title":        ToTitle,
 	"time":         Time,
+	"timeAgo":      TimeAgo,
 	"trimLeft":     TrimLeft,
 	"trimRight":    TrimRight,
 	"trimPrefix":   TrimPrefix,
@@ -92,6 +93,7 @@ var SafeFuncs = map[string]interface{}{
 	"splitn":       SplitN,
 	"title":        ToTitle,
 	"time":         Time,
+	"timeAgo":      TimeAgo,
 	"trimLeft":     TrimLeft,
 	"trimRight":    TrimRight,
 	"trimPrefix":   TrimPrefix,

time.go

@@ -4,7 +4,10 @@
 
 package funcmap
 
-import "time"
+import (
+	"fmt"
+	"time"
+)
 
 // Time converts the textual representation of the datetime
 // string into a time.Time interface.
@@ -44,3 +47,43 @@ func TimeFormat(layout string, v interface{}) (string, error) {
 func Now() time.Time {
 	return time.Now()
 }
+
+// TimeAgo returns the relative time.
+func TimeAgo(v interface{}) (string, error) {
+	t, err := toTimeE(v)
+	if err != nil {
+		return "", err
+	}
+
+	now := time.Now()
+	diff := now.Sub(t)
+
+	switch {
+	case diff < time.Minute:
+		secs := int(diff.Seconds())
+		if secs <= 1 {
+			return "1s ago", nil
+		}
+		return fmt.Sprintf("%ds ago", secs), nil
+
+	case diff < time.Hour:
+		mins := int(diff.Minutes())
+		return fmt.Sprintf("%dm ago", mins), nil
+
+	case diff < 24*time.Hour:
+		hours := int(diff.Hours())
+		return fmt.Sprintf("%dh ago", hours), nil
+
+	case diff < 30*24*time.Hour:
+		days := int(diff.Hours() / 24)
+		return fmt.Sprintf("%dd ago", days), nil
+
+	case diff < 365*24*time.Hour:
+		months := int(diff.Hours() / (24 * 30))
+		return fmt.Sprintf("%dmo ago", months), nil
+
+	default:
+		years := int(diff.Hours() / (24 * 365))
+		return fmt.Sprintf("%dy ago", years), nil
+	}
+}