From: Taylor Blau <me@ttaylorr.com>
To: git@vger.kernel.org
Cc: gitster@pobox.com, peff@peff.net, Taylor Blau <me@ttaylorr.com>
Subject: [PATCH v2] ref-filter.c: pass empty-string as NULL to atom parsers
Date: Mon, 2 Oct 2017 09:10:34 -0700 [thread overview]
Message-ID: <20171002161034.44867-1-me@ttaylorr.com> (raw)
In-Reply-To: <20171002055052.GB10729@D-10-157-251-166.dhcp4.washington.edu>
Peff points out that different atom parsers handle the empty
"sub-argument" list differently. An example of this is the format
"%(refname:)".
Since callers often use `string_list_split` (which splits the empty
string with any delimiter as a 1-ary string_list containing the empty
string), this makes handling empty sub-argument strings non-ergonomic.
Let's fix this by assuming that atom parser implementations don't care
about distinguishing between the empty string "%(refname:)" and no
sub-arguments "%(refname)".
Signed-off-by: Taylor Blau <me@ttaylorr.com>
---
ref-filter.c | 10 +++++++++-
t/t6300-for-each-ref.sh | 1 +
2 files changed, 10 insertions(+), 1 deletion(-)
diff --git a/ref-filter.c b/ref-filter.c
index bc591f4f3..f3e53d444 100644
--- a/ref-filter.c
+++ b/ref-filter.c
@@ -415,8 +415,16 @@ static int parse_ref_filter_atom(const struct ref_format *format,
REALLOC_ARRAY(used_atom, used_atom_cnt);
used_atom[at].name = xmemdupz(atom, ep - atom);
used_atom[at].type = valid_atom[i].cmp_type;
- if (arg)
+ if (arg) {
arg = used_atom[at].name + (arg - atom) + 1;
+ if (!*arg) {
+ /*
+ * Treat empty sub-arguments list as NULL (i.e.,
+ * "%(atom:)" is equivalent to "%(atom)").
+ */
+ arg = NULL;
+ }
+ }
memset(&used_atom[at].u, 0, sizeof(used_atom[at].u));
if (valid_atom[i].parser)
valid_atom[i].parser(format, &used_atom[at], arg);
diff --git a/t/t6300-for-each-ref.sh b/t/t6300-for-each-ref.sh
index 2274a4b73..edc1bd8ea 100755
--- a/t/t6300-for-each-ref.sh
+++ b/t/t6300-for-each-ref.sh
@@ -51,6 +51,7 @@ test_atom() {
}
test_atom head refname refs/heads/master
+test_atom head refname: refs/heads/master
test_atom head refname:short master
test_atom head refname:lstrip=1 heads/master
test_atom head refname:lstrip=2 master
--
2.14.1.145.gb3622a4ee
next prev parent reply other threads:[~2017-10-02 16:10 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-02 5:50 [PATCH 0/1] ref-filter.c: pass empty-string as NULL to atom parsers Taylor Blau
2017-10-02 5:53 ` [PATCH] " Taylor Blau
2017-10-02 6:43 ` Jeff King
2017-10-02 16:12 ` Taylor Blau
2017-10-02 19:42 ` Jeff King
2017-10-02 16:10 ` Taylor Blau [this message]
2017-10-02 19:42 ` [PATCH v2] " Jeff King
2017-10-02 22:40 ` Jonathan Nieder
2017-10-02 23:55 ` Junio C Hamano
2017-10-03 3:37 ` Taylor Blau
2017-10-05 1:49 ` Junio C Hamano
2017-10-05 2:11 ` Jonathan Nieder
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