tag: add --points-at list option
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>
diff --git a/builtin/tag.c b/builtin/tag.c
index 31f02e8..27c3557 100644
--- a/builtin/tag.c
+++ b/builtin/tag.c
@@ -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 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 @@
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 @@
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 @@
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 @@
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 @@
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)
