strbuf_add_commented_lines(): avoid SP-HT sequence in commented lines

The strbuf_add_commented_lines() function passes a pair of prefixes,
one to be used for a non-empty line, and the other for an empty
line, to underlying add_lines().  The former is set to a comment
char followed by a SP, while the latter is set to just the comment
char.  This is designed to give a SP after the comment character,
e.g. "# <user text>\n", on a line with some text, and to avoid
emitting an unsightly "# \n" for an empty line.

Teach this machinery to also use the latter space-less prefix when
the payload line begins with a tab, to show e.g. "#\t<user text>\n";
otherwise we will end up showing "# \t<user text>\n" which is
similarly unsightly.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/strbuf.c b/strbuf.c
index 33018d8..a4486a9 100644
--- a/strbuf.c
+++ b/strbuf.c
@@ -222,7 +222,8 @@ static void add_lines(struct strbuf *out,
 		const char *next = memchr(buf, '\n', size);
 		next = next ? (next + 1) : (buf + size);
 
-		prefix = (prefix2 && buf[0] == '\n') ? prefix2 : prefix1;
+		prefix = ((prefix2 && (buf[0] == '\n' || buf[0] == '\t'))
+			  ? prefix2 : prefix1);
 		strbuf_addstr(out, prefix);
 		strbuf_add(out, buf, next - buf);
 		size -= next - buf;