From ba6592f515705aa181e65834b6b1c36b72873d4a Mon Sep 17 00:00:00 2001
From: Dan Allen <dan.j.allen@gmail.com>
Date: Tue, 30 Jan 2018 23:30:51 -0700
Subject: [PATCH] only register the option:version event once

- create Option directly to avoid registering the option:version event twice
- defer to the Option instance to resolve the long name of the option for the event
---
 index.js | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/index.js b/index.js
index 36f3b9b1b..c467b10f7 100644
--- a/index.js
+++ b/index.js
@@ -855,9 +855,9 @@ Command.prototype.version = function(str, flags) {
   if (arguments.length === 0) return this._version;
   this._version = str;
   flags = flags || '-V, --version';
-  var longOptIndex = flags.indexOf('--');
-  this._versionOptionName = ~longOptIndex ? flags.substr(longOptIndex + 2) : 'version';
-  this.option(flags, 'output the version number');
+  var versionOption = new Option(flags, 'output the version number');
+  this._versionOptionName = versionOption.long.substr(2) || 'version';
+  this.options.push(versionOption);
   this.on('option:' + this._versionOptionName, function() {
     process.stdout.write(str + '\n');
     process.exit(0);