pretty: provide short date format

Add the placeholders %as and %cs to format author date and committer
date, respectively, without the time part, like --date=short does, i.e.
like YYYY-MM-DD.

Signed-off-by: René Scharfe <l.s.r@web.de>
Signed-off-by: Denton Liu <liu.denton@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/pretty.c b/pretty.c
index da154af..61014cc 100644
--- a/pretty.c
+++ b/pretty.c
@@ -731,6 +731,9 @@ static size_t format_person_part(struct strbuf *sb, char part,
 	case 'I':	/* date, ISO 8601 strict */
 		strbuf_addstr(sb, show_ident_date(&s, DATE_MODE(ISO8601_STRICT)));
 		return placeholder_len;
+	case 's':
+		strbuf_addstr(sb, show_ident_date(&s, DATE_MODE(SHORT)));
+		return placeholder_len;
 	}
 
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