From 4668a2e2ed8c8dfcd935247a4e5dcf26a35f63ac Mon Sep 17 00:00:00 2001
From: Sam Stephenson <sam@37signals.com>
Date: Wed, 3 Aug 2011 00:06:23 -0500
Subject: [PATCH] rbenv-whence requires a command argument

---
 libexec/rbenv-whence | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libexec/rbenv-whence b/libexec/rbenv-whence
index 30613eed..b6809a56 100755
--- a/libexec/rbenv-whence
+++ b/libexec/rbenv-whence
@@ -18,5 +18,10 @@ whence() {
 }
 
 RBENV_COMMAND="$1"
+if [ -z "$RBENV_COMMAND" ]; then
+  echo "usage: rbenv whence [--path] COMMAND" >&2
+  exit 1
+fi
+
 result="$(whence "$RBENV_COMMAND")"
 [ -n "$result" ] && echo "$result"