From 9e918a31f1a58ea3c971c649cfc12b18a609fb1d Mon Sep 17 00:00:00 2001
From: Henrik Lissner <henrik@lissner.net>
Date: Tue, 15 Oct 2013 07:47:05 -0400
Subject: [PATCH] rvm & vim will only update if they're pre-installed

---
 bin/update | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/bin/update b/bin/update
index 26bf10e4..8597a085 100755
--- a/bin/update
+++ b/bin/update
@@ -1,4 +1,4 @@
-#!/bin/zsh
+#!/usr/bin/env zsh
 
 # Ask for the administrator password upfront
 sudo -v
@@ -21,10 +21,15 @@ echo-g "==> Updating zsh, rvm and vim"
 # Then the rest
 install/zsh
 echo
-if is_mac; then
+
+# Only update rvm is it is installed
+if is_mac && command_exists rvm; then
     install/rvm
     echo
 fi
-install/vim
+
+if [ -d ~/.vim ]; then
+    install/vim
+fi
 
 echo-g "==> All done!"