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describe: fix --no-exact-match

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Since 2c33f75754 (Teach git-describe --exact-match to avoid expensive
tag searches, 2008-02-24) git describe accepts --no-exact-match, but it
does the same as --exact-match, an alias for --candidates=0.  That's
because it's defined using OPT_SET_INT with a value of 0, which sets 0
when negated as well.

Let --no-exact-match set the number of candidates to the default value
instead.  Users that need a more specific lack of exactitude can specify
their preferred value using --candidates, as before.

The "--no-exact-match" option was not covered in the tests, so let's
add a few.  Also add a case where --exact-match option is used on a
commit that cannot be described without distance from tags and make
sure the command fails.

Signed-off-by: René Scharfe <l.s.r@web.de>
[jc: added trivial tests]
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
René Scharfe 2023-07-21 15:41:33 +02:00 committed by Junio C Hamano
parent fb7d80edca
commit c95ae3ff9c
2 changed files with 22 additions and 3 deletions
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17
builtin/describe.c
View File

@ -24,6 +24,7 @@
#include "commit-slab.h"
#define MAX_TAGS (FLAG_BITS - 1)
#define DEFAULT_CANDIDATES 10
define_commit_slab(commit_names, struct commit_name *);
@ -40,7 +41,7 @@ static int tags; /* Allow lightweight tags */
static int longformat;
static int first_parent;
static int abbrev = -1; /* unspecified */
static int max_candidates = 10;
static int max_candidates = DEFAULT_CANDIDATES;
static struct hashmap names;
static int have_util;
static struct string_list patterns = STRING_LIST_INIT_NODUP;
@ -556,6 +557,15 @@ static void describe(const char *arg, int last_one)
strbuf_release(&sb);
}
static int option_parse_exact_match(const struct option *opt, const char *arg,
int unset)
{
BUG_ON_OPT_ARG(arg);
max_candidates = unset ? DEFAULT_CANDIDATES : 0;
return 0;
}
int cmd_describe(int argc, const char **argv, const char *prefix)
{
int contains = 0;
@ -567,8 +577,9 @@ int cmd_describe(int argc, const char **argv, const char *prefix)
OPT_BOOL(0, "long", &longformat, N_("always use long format")),
OPT_BOOL(0, "first-parent", &first_parent, N_("only follow first parent")),
OPT__ABBREV(&abbrev),
OPT_SET_INT(0, "exact-match", &max_candidates,
N_("only output exact matches"), 0),
OPT_CALLBACK_F(0, "exact-match", NULL, NULL,
N_("only output exact matches"),
PARSE_OPT_NOARG, option_parse_exact_match),
OPT_INTEGER(0, "candidates", &max_candidates,
N_("consider <n> most recent tags (default: 10)")),
OPT_STRING_LIST(0, "match", &patterns, N_("pattern"),

8
t/t6120-describe.sh
View File

@ -85,6 +85,7 @@ check_describe e-1-gHASH --tags HEAD^^
check_describe c-2-gHASH --tags HEAD^^2
check_describe B --tags HEAD^^2^
check_describe e --tags HEAD^^^
check_describe e --tags --exact-match HEAD^^^
check_describe heads/main --all HEAD
check_describe tags/c-6-gHASH --all HEAD^
@ -96,6 +97,13 @@ check_describe A-3-gHASH --long HEAD^^2
check_describe c-7-gHASH --tags
check_describe e-3-gHASH --first-parent --tags
check_describe c-7-gHASH --tags --no-exact-match HEAD
check_describe e-3-gHASH --first-parent --tags --no-exact-match HEAD
test_expect_success '--exact-match failure' '
test_must_fail git describe --exact-match HEAD 2>err
'
test_expect_success 'describe --contains defaults to HEAD without commit-ish' '
echo "A^0" >expect &&
git checkout A &&