From 0861056a4b5588c5a8541faf33d214172a14683a Mon Sep 17 00:00:00 2001
From: Nate Fischer <ntfschr@gmail.com>
Date: Fri, 4 Mar 2016 18:32:53 -0800
Subject: [PATCH] refactor(cd): use process.env.OLDPWD to store previous dir

---
 src/cd.js     | 6 +++---
 src/common.js | 3 ++-
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/src/cd.js b/src/cd.js
index 51bc057..95de954 100644
--- a/src/cd.js
+++ b/src/cd.js
@@ -10,16 +10,16 @@ function _cd(options, dir) {
     dir = common.getUserHome();
 
   if (dir === '-') {
-    if (!common.state.previousDir)
+    if (!process.env.OLDPWD)
       common.error('could not find previous directory');
     else
-      dir = common.state.previousDir;
+      dir = process.env.OLDPWD;
   }
 
   try {
     var curDir = process.cwd();
     process.chdir(dir);
-    common.state.previousDir = curDir;
+    process.env.OLDPWD = curDir;
   } catch (e) {
     // something went wrong, let's figure out the error
     var err;
diff --git a/src/common.js b/src/common.js
index 1ac42f4..9270181 100644
--- a/src/common.js
+++ b/src/common.js
@@ -21,11 +21,12 @@ exports.config = config;
 var state = {
   error: null,
   currentCmd: 'shell.js',
-  previousDir: null,
   tempDir: null
 };
 exports.state = state;
 
+process.env.OLDPWD = null; // initially, there's no previous directory
+
 var platform = os.type().match(/^Win/) ? 'win' : 'unix';
 exports.platform = platform;