From 5287e2ebf46b8636af653c1c61d4dc0dffd65796 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mislav=20Marohni=C4=87?= <mislav.marohnic@gmail.com>
Date: Sat, 4 Jan 2014 16:36:02 +0100
Subject: [PATCH] Avoid slow `abs_dirname()` by loading `realpath` extension

This speeds up every `rbenv` invocation significantly.
---
 libexec/rbenv | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/libexec/rbenv b/libexec/rbenv
index 2d475857..a458c473 100755
--- a/libexec/rbenv
+++ b/libexec/rbenv
@@ -12,6 +12,12 @@ if [ -n "$RBENV_DEBUG" ]; then
   set -x
 fi
 
+if enable -f "${0%/*}"/../libexec/rbenv-realpath.dylib realpath 2>/dev/null; then
+  abs_dirname() {
+    local path="$(realpath "$1")"
+    echo "${path%/*}"
+  }
+else
 READLINK=$(type -p greadlink readlink | head -1)
 if [ -z "$READLINK" ]; then
   echo "rbenv: cannot find readlink - are you missing GNU coreutils?" >&2
@@ -35,6 +41,7 @@ abs_dirname() {
   pwd
   cd "$cwd"
 }
+fi
 
 if [ -z "${RBENV_ROOT}" ]; then
   RBENV_ROOT="${HOME}/.rbenv"