[PATCH] Add OS X support to the pre-auto-gc example hook

[Jonathan del Strother <jon.delStrother@bestbefore.tv>]

Signed-off-by: Jonathan del Strother <jon.delStrother@bestbefore.tv>
---

Darwin / OS X has a pmset tool for getting power management information.  How about adding OS X support to the auto-gc hook?
Shell scripting isn't my forté, suggestions for improvements would be welcome.

 contrib/hooks/pre-auto-gc-battery |    9 ++++++---
 1 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/contrib/hooks/pre-auto-gc-battery b/contrib/hooks/pre-auto-gc-battery
index 0096f57..0b7bcde 100644
--- a/contrib/hooks/pre-auto-gc-battery
+++ b/contrib/hooks/pre-auto-gc-battery
@@ -1,9 +1,9 @@
 #!/bin/sh
 #
 # An example hook script to verify if you are on battery, in case you
-# are running Linux. Called by git-gc --auto with no arguments. The hook
-# should exit with non-zero status after issuing an appropriate message
-# if it wants to stop the auto repacking.
+# are running Linux or OS X. Called by git-gc --auto with no arguments.
+# The hook should exit with non-zero status after issuing an appropriate
+# message if it wants to stop the auto repacking.
 #
 # This hook is stored in the contrib/hooks directory. Your distribution
 # may have put this somewhere else. If you want to use this hook, you
@@ -30,6 +30,9 @@ then
 elif grep -q '0x01$' /proc/apm 2>/dev/null
 then
 	exit 0
+elif test -x /usr/bin/pmset && (! /usr/bin/pmset -g batt | grep -q 'Battery Power' )
+then
+	exit 0
 fi
 
 echo "Auto packing deferred; not on AC"
-- 
1.6.0.2.308.gd442a.dirty