From 3db48b8d9ab02f6baaf7789d578e551c7d0f9d00 Mon Sep 17 00:00:00 2001
From: Ethan Frey <ethanfrey@users.noreply.github.com>
Date: Sun, 6 Aug 2017 22:51:29 +0200
Subject: [PATCH] Add helper function to parse a command flag

---
 client/commands/common.go | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/client/commands/common.go b/client/commands/common.go
index 4bb565b6f9..15be46b244 100644
--- a/client/commands/common.go
+++ b/client/commands/common.go
@@ -5,6 +5,7 @@ package commands
 
 import (
 	"encoding/hex"
+	"fmt"
 	"strings"
 
 	"github.com/pkg/errors"
@@ -139,3 +140,17 @@ func GetOneArg(args []string, argname string) (string, error) {
 	}
 	return args[0], nil
 }
+
+// ParseHexFlag takes a flag name and parses the viper contents as hex
+func ParseHexFlag(flag string) ([]byte, error) {
+	arg := viper.GetString(flag)
+	if arg == "" {
+		return nil, errors.Errorf("No such flag: %s", flag)
+	}
+	value, err := hex.DecodeString(cmn.StripHex(arg))
+	if err != nil {
+		return nil, errors.Wrap(err, fmt.Sprintf("Cannot parse %s", flag))
+	}
+	return value, nil
+
+}