Re: [PATCH 3/4] format-patch: new --resend option for adding "RESEND" to patch subjects

> Add --resend as the new command-line option for "git format-patch" that adds
> "RESEND" as a (sub)suffix to the patch subject prefix, eventually producing
> "[PATCH RESEND]" as the default patch subject prefix.
> 
> "[PATCH RESEND]" is a patch subject prefix commonly used on mailing lists
> for patches resent to a mailing list after they had attracted no attention
> for some time, usually for a couple of weeks.  As such, this subject prefix
> deserves adding --resend as a new shorthand option to "git format-patch".

> Of course, add the description of the new --resend command-line option to
> the documentation for "git format-patch".
> 
> Signed-off-by: Dragan Simic <dsimic@manjaro.org>
> ---
>   Documentation/git-format-patch.txt |  5 +++++
>   builtin/log.c                      | 11 +++++++++--
>   2 files changed, 14 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/git-format-patch.txt b/Documentation/git-format-patch.txt
> index a5019ab46926..8e63b62620ed 100644
> --- a/Documentation/git-format-patch.txt
> +++ b/Documentation/git-format-patch.txt
> @@ -243,6 +243,11 @@ the patches (with a value of e.g. "PATCH my-project").
>   	default.  RFC means "Request For Comments"; use this when sending
>   	an experimental patch for discussion rather than application.
>   
> +--resend::
> +	Appends "RESEND" to the subject prefix, producing "PATCH RESEND"
> +	by default.  Use this when sending again a patch that had resulted
> +	in attracting no discussion for a while.
> +
>   -v <n>::
>   --reroll-count=<n>::
>   	Mark the series as the <n>-th iteration of the topic. The
> diff --git a/builtin/log.c b/builtin/log.c
> index e5a238f1cf2c..28f31659bcde 100644
> --- a/builtin/log.c
> +++ b/builtin/log.c
> @@ -1908,7 +1908,7 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
>   	struct strbuf rdiff_title = STRBUF_INIT;
>   	struct strbuf sprefix = STRBUF_INIT;
>   	int creation_factor = -1;
> -	int rfc = 0;
> +	int rfc = 0, resend = 0;
>   
>   	const struct option builtin_format_patch_options[] = {
>   		OPT_CALLBACK_F('n', "numbered", &numbered, NULL,
> @@ -1933,6 +1933,7 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
>   		OPT_INTEGER(0, "filename-max-length", &fmt_patch_name_max,
>   			    N_("max length of output filename")),
>   		OPT_BOOL(0, "rfc", &rfc, N_("use [RFC PATCH] instead of [PATCH]")),
> +		OPT_BOOL(0, "resend", &resend, N_("use [PATCH RESEND] instead of [PATCH]")),
>   		OPT_STRING(0, "cover-from-description", &cover_from_description_arg,
>   			    N_("cover-from-description-mode"),
>   			    N_("generate parts of a cover letter based on a branch's description")),
> @@ -2055,6 +2056,10 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
>   		strbuf_insertstr(&sprefix, 0, "RFC ");
>   		subject_prefix = 1;
>   	}
> +	if (resend) {
> +		strbuf_addstr(&sprefix, " RESEND");
> +		subject_prefix = 1;
> +	}
>   
>   	if (reroll_count) {
>   		strbuf_addf(&sprefix, " v%s", reroll_count);
> @@ -2111,7 +2116,9 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
>   	if (numbered && keep_subject)
>   		die(_("options '%s' and '%s' cannot be used together"), "-n", "-k");
>   	if (keep_subject && subject_prefix)
> -		die(_("options '%s' and '%s' cannot be used together"), "--subject-prefix/--rfc", "-k");
> +		die(_("options '%s' and '%s' cannot be used together"), "--subject-prefix/--rfc/--resend", "-k");
> +	if (rfc && resend)
> +		die(_("options '%s' and '%s' cannot be used together"), "--rfc", "--resend");
>   	rev.preserve_subject = keep_subject;
>   
>   	argc = setup_revisions(argc, argv, &rev, &s_r_opt);
>