From fc136ebeec16cd68d2ca630c1687f1106cc507d6 Mon Sep 17 00:00:00 2001
From: Matthew Iversen <teh.ivo@gmail.com>
Date: Mon, 18 Jan 2016 23:50:52 +1100
Subject: Homogenize test syntax, add explanation of it

---
 virtualenv_embedded/activate.sh | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'virtualenv_embedded')

diff --git a/virtualenv_embedded/activate.sh b/virtualenv_embedded/activate.sh
index 4dff986..ecf30a7 100644
--- a/virtualenv_embedded/activate.sh
+++ b/virtualenv_embedded/activate.sh
@@ -5,6 +5,7 @@ deactivate () {
     unset -f pydoc
 
     # reset old environment variables
+    # ! [ -z ${VAR+_} ] returns true if VAR is declared at all
     if ! [ -z "${_OLD_VIRTUAL_PATH+_}" ] ; then
         PATH="$_OLD_VIRTUAL_PATH"
         export PATH
@@ -47,7 +48,7 @@ PATH="$VIRTUAL_ENV/__BIN_NAME__:$PATH"
 export PATH
 
 # unset PYTHONHOME if set
-if ! [ -z "${PYTHONHOME+x}" ] ; then
+if ! [ -z "${PYTHONHOME+_}" ] ; then
     _OLD_VIRTUAL_PYTHONHOME="$PYTHONHOME"
     unset PYTHONHOME
 fi
-- 
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