ref-filter.c: parse trailers arguments with %(contents) atom

The %(contents) atom takes a contents "field" as its argument. Since
"trailers" is one of those fields, extend contents_atom_parser to parse
"trailers"'s arguments when used through "%(contents)", like:

  %(contents:trailers:unfold,only)

A caveat: trailers_atom_parser expects NULL when no arguments are given
(see: `parse_ref_filter_atom`). This is because string_list_split (given
a maxsplit of -1) returns a 1-ary string_list* containing the given
string if the delimiter could not be found using `strchr`.

To simulate this behavior without teaching trailers_atom_parser to
accept strings with length zero, conditionally pass NULL to
trailers_atom_parser if the arguments portion of the argument to
%(contents) is empty.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/ref-filter.c b/ref-filter.c
index 43ed10a..85625fe 100644 (file)
--- a/ref-filter.c
+++ b/ref-filter.c
@@ -212,9 +212,10 @@ static void contents_atom_parser(const struct ref_format *format, struct used_at
                atom->u.contents.option = C_SIG;
        else if (!strcmp(arg, "subject"))
                atom->u.contents.option = C_SUB;
-       else if (!strcmp(arg, "trailers"))
-               atom->u.contents.option = C_TRAILERS;
-       else if (skip_prefix(arg, "lines=", &arg)) {
+       else if (skip_prefix(arg, "trailers", &arg)) {
+               skip_prefix(arg, ":", &arg);
+               trailers_atom_parser(format, atom, *arg ? arg : NULL);
+       } else if (skip_prefix(arg, "lines=", &arg)) {
                atom->u.contents.option = C_LINES;
                if (strtoul_ui(arg, 10, &atom->u.contents.nlines))
                        die(_("positive value expected contents:lines=%s"), arg);

diff --git a/t/t6300-for-each-ref.sh b/t/t6300-for-each-ref.sh
index 64a0d9e..3bdfa02 100755 (executable)
--- a/t/t6300-for-each-ref.sh
+++ b/t/t6300-for-each-ref.sh
@@ -655,6 +655,35 @@ test_expect_success '%(trailers:only) and %(trailers:unfold) work together' '
        test_cmp expect actual
 '
 
+test_expect_success '%(contents:trailers:unfold) unfolds trailers' '
+       git for-each-ref --format="%(contents:trailers:unfold)" refs/heads/master >actual &&
+       {
+               unfold <trailers
+               echo
+       } >expect &&
+       test_cmp expect actual
+'
+
+test_expect_success '%(contents:trailers:only) shows only "key: value" trailers' '
+       git for-each-ref --format="%(contents:trailers:only)" refs/heads/master >actual &&
+       {
+               grep -v patch.description <trailers &&
+               echo
+       } >expect &&
+       test_cmp expect actual
+'
+
+test_expect_success '%(contents:trailers:only) and %(contents:trailers:unfold) work together' '
+       git for-each-ref --format="%(contents:trailers:only,unfold)" refs/heads/master >actual &&
+       git for-each-ref --format="%(contents:trailers:unfold,only)" refs/heads/master >reverse &&
+       test_cmp actual reverse &&
+       {
+               grep -v patch.description <trailers | unfold &&
+               echo
+       } >expect &&
+       test_cmp expect actual
+'
+
 test_expect_success '%(trailers) rejects unknown trailers arguments' '
        # error message cannot be checked under i18n
        cat >expect <<-EOF &&
@@ -664,6 +693,15 @@ test_expect_success '%(trailers) rejects unknown trailers arguments' '
        test_i18ncmp expect actual
 '
 
+test_expect_success '%(contents:trailers) rejects unknown trailers arguments' '
+       # error message cannot be checked under i18n
+       cat >expect <<-EOF &&
+       fatal: unknown %(trailers) argument: unsupported
+       EOF
+       test_must_fail git for-each-ref --format="%(contents:trailers:unsupported)" 2>actual &&
+       test_i18ncmp expect actual
+'
+
 test_expect_success 'basic atom: head contents:trailers' '
        git for-each-ref --format="%(contents:trailers)" refs/heads/master >actual &&
        sanitize_pgp <actual >actual.clean &&