From 9c6a7aca3e6870909018d3de83527d04d3c5f37d Mon Sep 17 00:00:00 2001
From: rupa <rupa@lrrr.us>
Date: Mon, 27 May 2013 14:41:16 -0400
Subject: [PATCH] Handle empty PROMPT_COMMANDS

---
 z.sh | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/z.sh b/z.sh
index 7e153f0..c946488 100644
--- a/z.sh
+++ b/z.sh
@@ -217,8 +217,8 @@ elif complete &> /dev/null; then
  complete -o filenames -C '_z --complete "$COMP_LINE"' ${_Z_CMD:-z}
  [ "$_Z_NO_PROMPT_COMMAND" ] || {
   # bash populate directory list. avoid clobbering other PROMPT_COMMANDs.
-  echo $PROMPT_COMMAND | grep -q "_z --add" || {
-   PROMPT_COMMAND="${PROMPT_COMMAND%;}"';_z --add "$(pwd '$_Z_RESOLVE_SYMLINKS' 2>/dev/null)" 2>/dev/null;'
+  grep -q "_z --add" <<< "$PROMPT_COMMAND" || {
+   PROMPT_COMMAND="${PROMPT_COMMAND%;}${PROMPT_COMMAND:+;}"'_z --add "$(pwd '$_Z_RESOLVE_SYMLINKS' 2>/dev/null)" 2>/dev/null;'
   }
  }
 fi