Re: [GSoC][PATCH v3 06/13] rebase -i: rewrite setup_reflog_action() in C

> This rewrites (the misnamed) setup_reflog_action() from shell to C. The
> new version is called prepare_branch_to_be_rebased().
>
> A new command is added to rebase--helper.c, “checkout-base”, as well as
> a new flag, “verbose”, to avoid silencing the output of the checkout
> operation called by checkout_base_commit().
>
> The function `run_git_checkout()` will also be used in the next commit,
> therefore its code is not part of `checkout_base_commit()`.
>
> The shell version is then stripped in favour of a call to the helper.
>
> As $GIT_REFLOG_ACTION is no longer set at the first call of
> checkout_onto(), a call to comment_for_reflog() is added at the
> beginning of this function.
>
> Signed-off-by: Alban Gruin <alban.gruin@gmail.com>
> ---
>  builtin/rebase--helper.c   | 10 ++++++++--
>  git-rebase--interactive.sh | 16 ++--------------
>  sequencer.c                | 30 ++++++++++++++++++++++++++++++
>  sequencer.h                |  2 ++
>  4 files changed, 42 insertions(+), 16 deletions(-)
>
> diff --git a/builtin/rebase--helper.c b/builtin/rebase--helper.c
> index 731a64971..76bdc6fdb 100644
> --- a/builtin/rebase--helper.c
> +++ b/builtin/rebase--helper.c
> @@ -13,12 +13,12 @@ static const char * const builtin_rebase_helper_usage[] = {
>  int cmd_rebase__helper(int argc, const char **argv, const char *prefix)
>  {
>  	struct replay_opts opts = REPLAY_OPTS_INIT;
> -	unsigned flags = 0, keep_empty = 0, rebase_merges = 0;
> +	unsigned flags = 0, keep_empty = 0, rebase_merges = 0, verbose = 0;

>  	struct option options[] = {
>  		OPT_BOOL(0, "ff", &opts.allow_ff, N_("allow fast-forward")),
> @@ -28,6 +28,7 @@ int cmd_rebase__helper(int argc, const char **argv, const char *prefix)
>  		OPT_BOOL(0, "rebase-merges", &rebase_merges, N_("rebase merge commits")),
>  		OPT_BOOL(0, "rebase-cousins", &rebase_cousins,
>  			 N_("keep original branch points of cousins")),
> +		OPT__VERBOSE(&verbose, N_("be verbose")),

> @@ -60,6 +63,7 @@ int cmd_rebase__helper(int argc, const char **argv, const char *prefix)
>  	opts.action = REPLAY_INTERACTIVE_REBASE;
>  	opts.allow_ff = 1;
>  	opts.allow_empty = 1;
> +	opts.verbose = verbose;
>  
>  	argc = parse_options(argc, argv, NULL, options,
>  			builtin_rebase_helper_usage, PARSE_OPT_KEEP_ARGV0);
> @@ -94,5 +98,7 @@ int cmd_rebase__helper(int argc, const char **argv, const char *prefix)
>  		return !!append_todo_help(0, keep_empty);
>  	if (command == EDIT_TODO && argc == 1)
>  		return !!edit_todo_list(flags);
> +	if (command == PREPARE_BRANCH && argc == 2)
> +		return !!prepare_branch_to_be_rebased(&opts, argv[1]);