From 3ef937a64ed9b32cd889eaf76b6a1bee7ffd3e08 Mon Sep 17 00:00:00 2001
From: Jordan Harband <ljharb@gmail.com>
Date: Sun, 28 Jun 2015 18:15:15 -0700
Subject: [PATCH] Make `nvm_ensure_version_installed` slightly more efficient.

---
 nvm.sh | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/nvm.sh b/nvm.sh
index 1c742d6..cf9e73a 100755
--- a/nvm.sh
+++ b/nvm.sh
@@ -198,10 +198,14 @@ nvm_ensure_version_installed() {
   local PROVIDED_VERSION
   PROVIDED_VERSION="$1"
   local LOCAL_VERSION
+  local EXIT_CODE
   LOCAL_VERSION="$(nvm_version "$PROVIDED_VERSION")"
+  EXIT_CODE="$?"
   local NVM_VERSION_DIR
-  NVM_VERSION_DIR="$(nvm_version_path "$LOCAL_VERSION")"
-  if [ ! -d "$NVM_VERSION_DIR" ]; then
+  if [ "_$EXIT_CODE" = "_0" ]; then
+    NVM_VERSION_DIR="$(nvm_version_path "$LOCAL_VERSION")"
+  fi
+  if [ "_$EXIT_CODE" != "_0" ] || [ ! -d "$NVM_VERSION_DIR" ]; then
     VERSION="$(nvm_resolve_alias "$PROVIDED_VERSION")"
     if [ $? -eq 0 ]; then
       echo "N/A: version \"$PROVIDED_VERSION -> $VERSION\" is not yet installed" >&2