[PATCH] git-am: Keep index in case of abort with dirty index

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git am --abort resets the index unconditionally. But in case a previous
git am exited due to a dirty index it is preferable to keep that index.
Make it so.

Signed-off-by: Michael J Gruber <git@xxxxxxxxxxxxxxxxxxxx>
---
Something like this?

 git-am.sh |   12 +++++++++---
 1 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/git-am.sh b/git-am.sh
index 8bcb206..7013fea 100755
--- a/git-am.sh
+++ b/git-am.sh
@@ -230,8 +230,10 @@ then
 		;;
 	,t)
 		git rerere clear
-		git read-tree --reset -u HEAD ORIG_HEAD
-		git reset ORIG_HEAD
+		test -f "$dotest/dirtyindex" || {
+			git read-tree --reset -u HEAD ORIG_HEAD
+			git reset ORIG_HEAD
+		}
 		rm -fr "$dotest"
 		exit ;;
 	esac
@@ -287,7 +289,11 @@ fi
 case "$resolved" in
 '')
 	files=$(git diff-index --cached --name-only HEAD --) || exit
-	test "$files" && die "Dirty index: cannot apply patches (dirty: $files)"
+	if test "$files"
+	then
+		: >"$dotest/dirtyindex"
+		die "Dirty index: cannot apply patches (dirty: $files)"
+	fi
 esac
 
 if test "$(cat "$dotest/utf8")" = t
-- 
1.6.2.rc1.30.gd43c

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