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tag: add --points-at list option

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This filters the list for tags of the given object.
Example,

   john$ git tag v1.0-john v1.0
   john$ git tag -l --points-at v1.0
   v1.0-john
   v1.0

Signed-off-by: Tom Grennan <tmgrennan@gmail.com>
Reviewed-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Tom Grennan 2012-02-08 15:03:43 -08:00 committed by Junio C Hamano
parent 828ea97de4
commit ae7706b9ac
3 changed files with 93 additions and 2 deletions
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6
Documentation/git-tag.txt
View file

@ -12,7 +12,8 @@ SYNOPSIS
'git tag' [-a | -s | -u <key-id>] [-f] [-m <msg> | -F <file>]
<tagname> [<commit> | <object>]
'git tag' -d <tagname>...
'git tag' [-n[<num>]] -l [--contains <commit>] [<pattern>...]
'git tag' [-n[<num>]] -l [--contains <commit>] [--points-at <object>]
[<pattern>...]
'git tag' -v <tagname>...
DESCRIPTION
@ -86,6 +87,9 @@ OPTIONS
--contains <commit>::
Only list tags which contain the specified commit.
--points-at <object>::
Only list tags of the given object.
-m <msg>::
--message=<msg>::
Use the given tag message (instead of prompting).

50
builtin/tag.c
View file

@ -15,11 +15,13 @@
#include "diff.h"
#include "revision.h"
#include "gpg-interface.h"
#include "sha1-array.h"
static const char * const git_tag_usage[] = {
"git tag [-a|-s|-u <key-id>] [-f] [-m <msg>|-F <file>] <tagname> [<head>]",
"git tag -d <tagname>...",
"git tag -l [-n[<num>]] [<pattern>...]",
"git tag -l [-n[<num>]] [--contains <commit>] [--points-at <object>] "
"\n\t\t[<pattern>...]",
"git tag -v <tagname>...",
NULL
};
@ -30,6 +32,8 @@ struct tag_filter {
struct commit_list *with_commit;
};
static struct sha1_array points_at;
static int match_pattern(const char **patterns, const char *ref)
{
/* no pattern means match everything */
@ -41,6 +45,24 @@ static int match_pattern(const char **patterns, const char *ref)
return 0;
}
static const unsigned char *match_points_at(const char *refname,
const unsigned char *sha1)
{
const unsigned char *tagged_sha1 = NULL;
struct object *obj;
if (sha1_array_lookup(&points_at, sha1) >= 0)
return sha1;
obj = parse_object(sha1);
if (!obj)
die(_("malformed object at '%s'"), refname);
if (obj->type == OBJ_TAG)
tagged_sha1 = ((struct tag *)obj)->tagged->sha1;
if (tagged_sha1 && sha1_array_lookup(&points_at, tagged_sha1) >= 0)
return tagged_sha1;
return NULL;
}
static int in_commit_list(const struct commit_list *want, struct commit *c)
{
for (; want; want = want->next)
@ -105,6 +127,9 @@ static int show_reference(const char *refname, const unsigned char *sha1,
return 0;
}
if (points_at.nr && !match_points_at(refname, sha1))
return 0;
if (!filter->lines) {
printf("%s\n", refname);
return 0;
@ -375,6 +400,23 @@ static int strbuf_check_tag_ref(struct strbuf *sb, const char *name)
return check_refname_format(sb->buf, 0);
}
int parse_opt_points_at(const struct option *opt __attribute__ ((unused)),
const char *arg, int unset)
{
unsigned char sha1[20];
if (unset) {
sha1_array_clear(&points_at);
return 0;
}
if (!arg)
return error(_("switch 'points-at' requires an object"));
if (get_sha1(arg, sha1))
return error(_("malformed object name '%s'"), arg);
sha1_array_append(&points_at, sha1);
return 0;
}
int cmd_tag(int argc, const char **argv, const char *prefix)
{
struct strbuf buf = STRBUF_INIT;
@ -417,6 +459,10 @@ int cmd_tag(int argc, const char **argv, const char *prefix)
PARSE_OPT_LASTARG_DEFAULT,
parse_opt_with_commit, (intptr_t)"HEAD",
},
{
OPTION_CALLBACK, 0, "points-at", NULL, "object",
"print only tags of the object", 0, parse_opt_points_at
},
OPT_END()
};
@ -448,6 +494,8 @@ int cmd_tag(int argc, const char **argv, const char *prefix)
die(_("-n option is only allowed with -l."));
if (with_commit)
die(_("--contains option is only allowed with -l."));
if (points_at.nr)
die(_("--points-at option is only allowed with -l."));
if (delete)
return for_each_tag_name(argv, delete_tag);
if (verify)

39
t/t7004-tag.sh
View file

@ -1269,4 +1269,43 @@ test_expect_success 'mixing incompatibles modes and options is forbidden' '
test_must_fail git tag -v -s
'
# check points-at
test_expect_success '--points-at cannot be used in non-list mode' '
test_must_fail git tag --points-at=v4.0 foo
'
test_expect_success '--points-at finds lightweight tags' '
echo v4.0 >expect &&
git tag --points-at v4.0 >actual &&
test_cmp expect actual
'
test_expect_success '--points-at finds annotated tags of commits' '
git tag -m "v4.0, annotated" annotated-v4.0 v4.0 &&
echo annotated-v4.0 >expect &&
git tag -l --points-at v4.0 "annotated*" >actual &&
test_cmp expect actual
'
test_expect_success '--points-at finds annotated tags of tags' '
git tag -m "describing the v4.0 tag object" \
annotated-again-v4.0 annotated-v4.0 &&
cat >expect <<-\EOF &&
annotated-again-v4.0
annotated-v4.0
EOF
git tag --points-at=annotated-v4.0 >actual &&
test_cmp expect actual
'
test_expect_success 'multiple --points-at are OR-ed together' '
cat >expect <<-\EOF &&
v2.0
v3.0
EOF
git tag --points-at=v2.0 --points-at=v3.0 >actual &&
test_cmp expect actual
'
test_done