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for-each-ref: add --stdin option

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When a user wishes to input a large list of patterns to 'git
for-each-ref' (likely a long list of exact refs) there are frequently
system limits on the number of command-line arguments.

Add a new --stdin option to instead read the patterns from standard
input. Add tests that check that any unrecognized arguments are
considered an error when --stdin is provided. Also, an empty pattern
list is interpreted as the complete ref set.

When reading from stdin, we populate the filter.name_patterns array
dynamically as opposed to pointing to the 'argv' array directly. This is
simple when using a strvec, as it is NULL-terminated in the same way. We
then free the memory directly from the strvec.

Helped-by: Phillip Wood <phillip.wood123@gmail.com>
Signed-off-by: Derrick Stolee <derrickstolee@github.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Derrick Stolee
2023-03-20 11:26:47 +00:00
committed by Junio C Hamano
parent d15644fe02
commit b73dec5530
3 changed files with 65 additions and 2 deletions
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23
builtin/for-each-ref.c
View File

@ -5,6 +5,7 @@
#include "object.h"
#include "parse-options.h"
#include "ref-filter.h"
#include "strvec.h"
static char const * const for_each_ref_usage[] = {
N_("git for-each-ref [<options>] [<pattern>]"),
@ -25,6 +26,8 @@ int cmd_for_each_ref(int argc, const char **argv, const char *prefix)
struct ref_format format = REF_FORMAT_INIT;
struct strbuf output = STRBUF_INIT;
struct strbuf err = STRBUF_INIT;
int from_stdin = 0;
struct strvec vec = STRVEC_INIT;
struct option opts[] = {
OPT_BIT('s', "shell", &format.quote_style,
@ -49,6 +52,7 @@ int cmd_for_each_ref(int argc, const char **argv, const char *prefix)
OPT_CONTAINS(&filter.with_commit, N_("print only refs which contain the commit")),
OPT_NO_CONTAINS(&filter.no_commit, N_("print only refs which don't contain the commit")),
OPT_BOOL(0, "ignore-case", &icase, N_("sorting and filtering are case insensitive")),
OPT_BOOL(0, "stdin", &from_stdin, N_("read reference patterns from stdin")),
OPT_END(),
};
@ -75,7 +79,23 @@ int cmd_for_each_ref(int argc, const char **argv, const char *prefix)
ref_sorting_set_sort_flags_all(sorting, REF_SORTING_ICASE, icase);
filter.ignore_case = icase;
filter.name_patterns = argv;
if (from_stdin) {
struct strbuf line = STRBUF_INIT;
if (argv[0])
die(_("unknown arguments supplied with --stdin"));
while (strbuf_getline(&line, stdin) != EOF)
strvec_push(&vec, line.buf);
strbuf_release(&line);
/* vec.v is NULL-terminated, just like 'argv'. */
filter.name_patterns = vec.v;
} else {
filter.name_patterns = argv;
}
filter.match_as_path = 1;
filter_refs(&array, &filter, FILTER_REFS_ALL);
ref_array_sort(sorting, &array);
@ -97,5 +117,6 @@ int cmd_for_each_ref(int argc, const char **argv, const char *prefix)
free_commit_list(filter.with_commit);
free_commit_list(filter.no_commit);
ref_sorting_release(sorting);
strvec_clear(&vec);
return 0;
}