From 60085528959341087b088970c8bea4b7870d6f5b Mon Sep 17 00:00:00 2001
From: "Suraj N. Kurapati" <sunaku@riseup.net>
Date: Sat, 16 Jul 2016 09:25:50 -0700
Subject: [PATCH] GH-44: fix "parameter not set" warning by `set -u`

$ zsh -f
zsh% set -u
zsh% source zsh-history-substring-search.zsh
zsh% bindkey '^[[A' history-substring-search-up
zsh% bindkey '^[[B' history-substring-search-down
zsh% so<up>
_history-substring-search-begin:11: _history_substring_search_result: parameter not set
---
 zsh-history-substring-search.zsh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/zsh-history-substring-search.zsh b/zsh-history-substring-search.zsh
index 80cdab0..e29c9b1 100644
--- a/zsh-history-substring-search.zsh
+++ b/zsh-history-substring-search.zsh
@@ -186,7 +186,7 @@ _history-substring-search-begin() {
   # search result, then just keep stepping through the match list. Otherwise
   # start a new search.
   #
-  if [[ -n $BUFFER && $BUFFER == $_history_substring_search_result ]]; then
+  if [[ -n $BUFFER && $BUFFER == ${_history_substring_search_result:-} ]]; then
     return;
   fi