split into packages

pkg/util/helper.go

@@ -0,0 +1,36 @@
+package main
+
+import (
+	"fmt"
+	"strconv"
+	"time"
+)
+
+const timeFmt = "2006-01-02 15:04:05"
+
+func now() string {
+	return time.Now().Format(timeFmt)
+}
+
+func since(t time.Time) string {
+	s := time.Since(t)
+	u := uint64(s)
+	if u <= 0 {
+		return "0s"
+	}
+	str := s.String()
+	switch {
+	case u >= uint64(time.Second):
+		f, _ := strconv.ParseFloat(str[:len(str)-1], 64)
+		return fmt.Sprintf("%.fs", f)
+	case u < uint64(time.Microsecond):
+		f, _ := strconv.ParseFloat(str[:len(str)-2], 64)
+		return fmt.Sprintf("%.fns", f)
+	case u < uint64(time.Millisecond):
+		f, _ := strconv.ParseFloat(str[:len(str)-3], 64)
+		return fmt.Sprintf("%.fµs", f)
+	default:
+		f, _ := strconv.ParseFloat(str[:len(str)-2], 64)
+		return fmt.Sprintf("%.fms", f)
+	}
+}