CMD: Time-based UUID Generator & Parser

cmd/uuid/main.go

@@ -0,0 +1,49 @@
+package main
+
+import (
+	"bytes"
+	"flag"
+	"fmt"
+	"io"
+	"os"
+	"strings"
+	"time"
+
+	"github.com/google/uuid"
+)
+
+var (
+	parse  = flag.String("d", "", "Parse given UUID.")
+	random = flag.Bool("r", false, "Generate Random UUID.")
+)
+
+func main() {
+	flag.Parse()
+	var lreader io.Reader
+
+	if *parse == "" && *random == false {
+		u, _ := uuid.NewUUID()
+		fmt.Printf("%s\n", u)
+	} else if *parse == "" && *random == true {
+		u := uuid.New()
+		fmt.Printf("%s\n", u)
+	} else if *parse != "" {
+		if *parse == "-" {
+			lreader = os.Stdin
+		} else if *parse != "-" {
+			lreader = strings.NewReader(*parse)
+		}
+		buf := new(bytes.Buffer)
+		buf.ReadFrom(lreader)
+		s := buf.String()
+
+		uuid, _ := uuid.Parse(s)
+		fmt.Printf("uuid : %s\n", uuid)
+
+		id := uuid
+		t := id.Time()
+		sec, nsec := t.UnixTime()
+		timeStamp := time.Unix(sec, nsec)
+		fmt.Printf("date : %v \n", timeStamp.Format("2006-01-02 Mon 15:04:05.000Z -0700"))
+	}
+}