[PATCH v4 07/15] sequencer: add "do_fast_forward()" to perform a fast forward

[Christian Couder <chriscool@tuxfamily.org>]

From: Stephan Beyer <s-beyer@gmx.net>

This function is a thin wrapper around "reset_almost_hard()".
It is usefull because it will help reduce a little the shell
code line count.

This code is taken from the sequencer GSoC project:

git://repo.or.cz/git/sbeyer.git

(at commit 5a78908b70ceb5a4ea9fd4b82f07ceba1f019079)

but the messages have been changed a little to be the same as
those displayed by "git-rebase--interactive.sh".

Mentored-by: Daniel Barkalow <barkalow@iabervon.org>
Mentored-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Stephan Beyer <s-beyer@gmx.net>
Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 builtin-sequencer--helper.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/builtin-sequencer--helper.c b/builtin-sequencer--helper.c
index be030bc..0cd7e98 100644
--- a/builtin-sequencer--helper.c
+++ b/builtin-sequencer--helper.c
@@ -171,6 +171,15 @@ static struct commit *get_commit(const char *arg)
 	return lookup_commit_reference(sha1);
 }
 
+static int do_fast_forward(const unsigned char *sha)
+{
+	if (reset_almost_hard(sha))
+		return error("Cannot fast forward to %s", sha1_to_hex(sha));
+	if (verbosity > 1)
+		printf("Fast forward to %s\n", sha1_to_hex(sha));
+	return 0;
+}
+
 static int set_verbosity(int verbose)
 {
 	char tmp[] = "0";
-- 
1.6.4.271.ge010d