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describe: teach describe negative pattern matches

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Teach git-describe the `--exclude` option which will allow specifying
a glob pattern of tags to ignore. This can be combined with the
`--match` patterns to enable more flexibility in determining which tags
to consider.

For example, suppose you wish to find the first official release tag
that contains a certain commit. If we assume that official release tags
are of the form "v*" and pre-release candidates include "*rc*" in their
name, we can now find the first release tag that introduces the commit
abcdef:

  git describe --contains --match="v*" --exclude="*rc*" abcdef

Add documentation, tests, and completion for this change.

Signed-off-by: Jacob Keller <jacob.keller@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jacob Keller
2017-01-18 15:06:08 -08:00
committed by Junio C Hamano
parent 43f8080eaf
commit 77d21f29ea
4 changed files with 40 additions and 0 deletions
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21
builtin/describe.c
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@ -29,6 +29,7 @@ static int max_candidates = 10;
static struct hashmap names;
static int have_util;
static struct string_list patterns = STRING_LIST_INIT_NODUP;
static struct string_list exclude_patterns = STRING_LIST_INIT_NODUP;
static int always;
static const char *dirty;
@ -129,6 +130,22 @@ static int get_name(const char *path, const struct object_id *oid, int flag, voi
if (!all && !is_tag)
return 0;
/*
* If we're given exclude patterns, first exclude any tag which match
* any of the exclude pattern.
*/
if (exclude_patterns.nr) {
struct string_list_item *item;
if (!is_tag)
return 0;
for_each_string_list_item(item, &exclude_patterns) {
if (!wildmatch(item->string, path + 10, 0, NULL))
return 0;
}
}
/*
* If we're given patterns, accept only tags which match at least one
* pattern.
@ -421,6 +438,8 @@ int cmd_describe(int argc, const char **argv, const char *prefix)
N_("consider <n> most recent tags (default: 10)")),
OPT_STRING_LIST(0, "match", &patterns, N_("pattern"),
N_("only consider tags matching <pattern>")),
OPT_STRING_LIST(0, "exclude", &exclude_patterns, N_("pattern"),
N_("do not consider tags matching <pattern>")),
OPT_BOOL(0, "always", &always,
N_("show abbreviated commit object as fallback")),
{OPTION_STRING, 0, "dirty", &dirty, N_("mark"),
@ -458,6 +477,8 @@ int cmd_describe(int argc, const char **argv, const char *prefix)
argv_array_push(&args, "--tags");
for_each_string_list_item(item, &patterns)
argv_array_pushf(&args, "--refs=refs/tags/%s", item->string);
for_each_string_list_item(item, &exclude_patterns)
argv_array_pushf(&args, "--exclude=refs/tags/%s", item->string);
}
if (argc)
argv_array_pushv(&args, argv);