From d3a6d8fbcc3a9475fc246aac8e22808e0d0dd0ef Mon Sep 17 00:00:00 2001
From: Zhao Cai <caizhaoff@gmail.com>
Date: Sun, 28 Apr 2013 21:15:56 -0400
Subject: [PATCH] Check GEM_HOME to compare recency

---
 src/_gem | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/_gem b/src/_gem
index 1391566..31f168e 100644
--- a/src/_gem
+++ b/src/_gem
@@ -509,8 +509,18 @@ _gem_which() {
 }
 
 _gem_extensions_caching_policy() {
+  if [[ -n $GEM_HOME ]]; then
+    gem_home=$GEM_HOME
+  else
+    gem_home=$(_call_program commands ${words[1]} env gemdir)
+  fi
+
+  # Rebuild if gems directory is more recent than cache.
+  [[ $gem_home/gems -nt "$1" ]] && return 0
+
+  # Rebuild if cache is older than one week.  
   local -a oldp
-  oldp=( "$1"(Nm+1) )
+  oldp=( "$1"(Nmw+1) )
   (( $#oldp ))
 }