Lets not do a full checkout on git cancel

---
commit 47197d9accb420ec55f6dfd63d990d4fb2537330
tree e8f3699877dd220440808087632ef87cce2288a7
parent c83b95297c2a6336c2007548f909769e0862b509
author Dan Weber <dan@mirrorlynx.com> 1114316504 -0400
committer Dan Weber <dan@mirrorlynx.com> 1114316504 -0400

Index: gitcancel.sh
===================================================================
--- 2aaf94eae20acc451553766f3c063bc46cfa75c6/gitcancel.sh  (mode:100755 sha1:26eecb50bc812211454e98d98e8818387ae97df5)
+++ e8f3699877dd220440808087632ef87cce2288a7/gitcancel.sh  (mode:100755 sha1:c836b75bb8a7c461b2d0ad536d1c3bc2d2440ab4)
@@ -2,6 +2,7 @@
 #
 # Cancels current edits in the working tree.
 # Copyright (c) Petr Baudis, 2005
+# Copyright (c) Dan Weber, 2005
 #
 # This script reverts the working tree to a consistent state before
 # any changes to it (including merges etc) were done.
@@ -26,5 +27,23 @@
 rm -f .git/blocked .git/merging .git/merging-sym .git/merge-base
 read-tree -m $(tree-id) || read-tree $(tree-id)
 
-checkout-cache -f -a
-update-cache --refresh
+general() {
+	for name in $(diff-cache -r $(tree-id)|awk '{print $4}')
+	do
+		checkout-cache -f $name
+	done
+	update-cache --refresh
+}
+
+full () {
+	checkout-cache -f -a
+	update-cache --refresh
+}
+
+
+if [ "$1" == "-a" -o "$1" == "--full" -o "$1" == "--all" ]; then
+	full
+else
+	general
+fi
+