From e50980f025cd460282ecb2b2a3bed7c72250416b Mon Sep 17 00:00:00 2001
From: Aaron LI <aaronly.me@outlook.com>
Date: Tue, 28 Feb 2017 10:09:54 +0800
Subject: Update command existence check function

Credit:
* Stackoverflow: Check if a program exists from a Bash script
  Credit: https://stackoverflow.com/a/677212/4856091
---
 _zsh/40-functions.zsh | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to '_zsh')

diff --git a/_zsh/40-functions.zsh b/_zsh/40-functions.zsh
index 77db01c..2b078ed 100644
--- a/_zsh/40-functions.zsh
+++ b/_zsh/40-functions.zsh
@@ -5,8 +5,12 @@
 #
 
 ## Check the existence/accessibility of a command
+# Credit: https://stackoverflow.com/a/677212/4856091
 function exists() {
-    which $1 &> /dev/null
+    # 'command' is POSIX-compliant and more portable;
+    # 'hash' only searches for commands;
+    # while 'type' also considers builtins and keywords.
+    type "$1" >/dev/null 2>&1
 }
 
 ## Check whether the program is running
-- 
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