pretty.c: add %(count) and %(total) placeholders

In many commands we can customize the output through the "--format" or
the "--pretty" options. This patch adds two new placeholders used mainly
when there's a range of commits that we want to show.

Currently these two placeholders are not usable as they're coupled with
the rev_info->nr and rev_info->total fields, fields that are used only
by the format-patch numbered email subjects.

Teach repo_format_commit_message() the %(count) and %(total)
placeholders.

Signed-off-by: Mirko Faina <mroik@delayed.space>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/pretty.c b/pretty.c
index e0646bbc5d..e29bb8b877 100644
--- a/pretty.c
+++ b/pretty.c
@@ -1549,6 +1549,21 @@ static size_t format_commit_one(struct strbuf *sb, /* in UTF-8 */
 	if (!commit->object.parsed)
 		parse_object(the_repository, &commit->object.oid);
 
+	if (starts_with(placeholder, "(count)")) {
+		if (!c->pretty_ctx->rev)
+			die(_("this format specifier can't be used with this command"));
+		strbuf_addf(sb, "%0*d", decimal_width(c->pretty_ctx->rev->total),
+			    c->pretty_ctx->rev->nr);
+		return 7;
+	}
+
+	if (starts_with(placeholder, "(total)")) {
+		if (!c->pretty_ctx->rev)
+			die(_("this format specifier can't be used with this command"));
+		strbuf_addf(sb, "%d", c->pretty_ctx->rev->total);
+		return 7;
+	}
+
 	switch (placeholder[0]) {
 	case 'H':		/* commit hash */
 		strbuf_addstr(sb, diff_get_color(c->auto_color, DIFF_COMMIT));