[PATCH 3/4] git-commit-am: Allow automatic rebasing to preserve empty commits

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Using the keep_empy environment variable, this change allows git-commit-am to
apply empty commits to the new branch we are rebasing to

Signed-off-by: Neil Horman <nhorman@xxxxxxxxxxxxx>
CC: Jeff King <peff@xxxxxxxx>
CC: Phil Hord <phil.hord@xxxxxxxxx>
CC: Junio C Hamano <gitster@xxxxxxxxx>
---
 git-rebase--am.sh |   20 +++++++++++++++-----
 1 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/git-rebase--am.sh b/git-rebase--am.sh
index c815a24..c1d1b60 100644
--- a/git-rebase--am.sh
+++ b/git-rebase--am.sh
@@ -20,11 +20,21 @@ esac
 
 test -n "$rebase_root" && root_flag=--root
 
-git format-patch -k --stdout --full-index --ignore-if-in-upstream \
-	--src-prefix=a/ --dst-prefix=b/ \
-	--no-renames $root_flag "$revisions" |
-git am $git_am_opt --rebasing --resolvemsg="$resolvemsg" &&
-move_to_original_branch
+if [ -n "$keep_empty" ]
+then
+	# we have to do this the hard way.  git format-patch completly squashes
+	# empty commits and even if it didn't the format doesn't really lend
+	# itself well to recording empty patches.  fortunately, cherry-pick
+	# makes this easy
+	git cherry-pick --keep-empty "$revisions" && move_to_original_branch
+else
+	git format-patch -k --stdout --full-index --ignore-if-in-upstream \
+		--src-prefix=a/ --dst-prefix=b/ \
+		--no-renames $root_flag "$revisions" |
+	git am $git_am_opt --rebasing --resolvemsg="$resolvemsg" &&
+	move_to_original_branch
+fi
+
 ret=$?
 test 0 != $ret -a -d "$state_dir" && write_basic_state
 exit $ret
-- 
1.7.7.6

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