builtin-commit: fix --signoff

The Signed-off-by: line contained a spurious timestamp.  The reason was
a call to git_committer_info(1), which automatically added the
timestamp.

Instead, fmt_ident() was taught to interpret an empty string for the
date (as opposed to NULL, which still triggers the default behavior)
as "do not bother with the timestamp", and builtin-commit.c uses it.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 7 insertions, 3 deletions

diff --git a/ident.c b/ident.c
index 9b2a852cb..5be7533ff 100644
--- a/ident.c
+++ b/ident.c
@@ -224,13 +224,17 @@ const char *fmt_ident(const char *name, const char *email,
 	}
 
 	strcpy(date, git_default_date);
-	if (date_str)
-		parse_date(date_str, date, sizeof(date));
+	if (date_str) {
+		if (*date_str)
+			parse_date(date_str, date, sizeof(date));
+		else
+			date[0] = '\0';
+	}
 
 	i = copy(buffer, sizeof(buffer), 0, name);
 	i = add_raw(buffer, sizeof(buffer), i, " <");
 	i = copy(buffer, sizeof(buffer), i, email);
-	i = add_raw(buffer, sizeof(buffer), i, "> ");
+	i = add_raw(buffer, sizeof(buffer), i, date[0] ? "> " : ">");
 	i = copy(buffer, sizeof(buffer), i, date);
 	if (i >= sizeof(buffer))
 		die("Impossibly long personal identifier");