This command redoes merges. It's useful if you rebase a branch that
contains merges and you want to preserve these merges. You can also use
it to add new merges.
---
 git-rebase--interactive.sh    |   25 +++++++++++++++++++++++++
 t/t3404-rebase-interactive.sh |    3 +++
 2 files changed, 28 insertions(+), 0 deletions(-)

diff --git a/git-rebase--interactive.sh b/git-rebase--interactive.sh
index 7dac51b..18cdf3d 100755
--- a/git-rebase--interactive.sh
+++ b/git-rebase--interactive.sh
@@ -362,6 +362,29 @@ do_next () {
 		git rev-parse --verify HEAD > "$MARKS"/$mark || \
 			die "HEAD is invalid"
 		;;
+	merge|m)
+		comment_for_reflog merge
+
+		if ! git rev-parse --verify $sha1
+		then
+			die "Invalid reference merge '$sha1' in $command $sha1 $rest"
+		fi
+
+		new_parents=
+		for p in $rest
+		do
+			tmp=$(mark_to_sha1 $p) || \
+				tmp=$(git rev-parse --verify $p) ||
+				die "Invalid parent '$sha1' in $command $sha1 $rest"
+			new_parents="$new_parents $tmp"
+		done
+		new_parents="${new_parents# }"
+		test -n "$new_parents" || \
+			die "You forgot to give the parents for the merge"
+
+		mark_action_done
+		redo_merge $sha1 $new_parents
+		;;
 	reset|r)
 		comment_for_reflog reset
 
@@ -589,6 +612,8 @@ do
 #  squash = use commit, but meld into previous commit
 #  mark #NUM = mark the current HEAD for later reference
 #  reset #NUM|commit = reset HEAD to a previous set mark or a commit
+#  merge commit-M #NUM|commit-P ... = redo merge commit-M with the
+#         current HEAD and the parents marked with #NUM or the commit-P
 #
 # If you remove a line here THAT COMMIT WILL BE LOST.
 # However, if you remove everything, the rebase will be aborted.
diff --git a/t/t3404-rebase-interactive.sh b/t/t3404-rebase-interactive.sh
index 521206f..892fd5d 100755
--- a/t/t3404-rebase-interactive.sh
+++ b/t/t3404-rebase-interactive.sh
@@ -88,6 +88,9 @@ for line in $FAKE_LINES; do
 	reset*)
 		echo "reset ${line#reset}"
 		echo "reset ${line#reset}" >> "$1";;
+	merge*)
+		echo "merge ${line#merge}" | tr / ' '
+		echo "merge ${line#merge}" | tr / ' ' >> "$1";;
 	*)
 		echo sed -n "${line}s/^pick/$action/p"
 		sed -n "${line}p" < "$1".tmp
-- 
1.5.4.5

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