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ref-filter.c: pass empty-string as NULL to atom parsers

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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 declaring that atom parser implementations must
not care about distinguishing between the empty string "%(refname:)"
and no sub-arguments "%(refname)".  Current code aborts, either with
"unrecognised arg" (e.g. "refname:") or "does not take args"
(e.g. "body:") as an error message.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Reviewed-by: Jeff King <peff@peff.net>
Reviewed-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Taylor Blau 2017-10-02 09:10:34 -07:00 committed by Junio C Hamano
parent 4010f1d1b7
commit bea4dbeafd
2 changed files with 10 additions and 1 deletions
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10
ref-filter.c
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@ -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);

1
t/t6300-for-each-ref.sh
View File

@ -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