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#include "cache.h"
#include "commit.h"
#include "tag.h"
#include "refs.h"
#include "diff.h"
#include "diffcore.h"
#include "revision.h"
#include "builtin.h"
static const char describe_usage[] =
"git-describe [--all] [--tags] [--abbrev=<n>] <committish>*";
static int all; /* Default to annotated tags only */
static int tags; /* But allow any tags if --tags is specified */
static int abbrev = DEFAULT_ABBREV;
static unsigned int names[256], allocs[256];
static struct commit_name {
struct commit *commit;
int prio; /* annotated tag = 2, tag = 1, head = 0 */
char path[FLEX_ARRAY]; /* more */
} **name_array[256];
static struct commit_name *match(struct commit *cmit)
{
unsigned char m = cmit->object.sha1[0];
unsigned int i = names[m];
struct commit_name **p = name_array[m];
while (i-- > 0) {
struct commit_name *n = *p++;
if (n->commit == cmit)
return n;
}
return NULL;
}
static void add_to_known_names(const char *path,
struct commit *commit,
int prio)
{
int idx;
int len = strlen(path)+1;
struct commit_name *name = xmalloc(sizeof(struct commit_name) + len);
unsigned char m = commit->object.sha1[0];
name->commit = commit;
name->prio = prio;
memcpy(name->path, path, len);
idx = names[m];
if (idx >= allocs[m]) {
allocs[m] = (idx + 50) * 3 / 2;
name_array[m] = xrealloc(name_array[m],
allocs[m] * sizeof(*name_array));
}
name_array[m][idx] = name;
names[m] = ++idx;
}
static int get_name(const char *path, const unsigned char *sha1, int flag, void *cb_data)
{
struct commit *commit = lookup_commit_reference_gently(sha1, 1);
struct object *object;
int prio;
if (!commit)
return 0;
object = parse_object(sha1);
/* If --all, then any refs are used.
* If --tags, then any tags are used.
* Otherwise only annotated tags are used.
*/
if (!strncmp(path, "refs/tags/", 10)) {
if (object->type == OBJ_TAG)
prio = 2;
else
prio = 1;
}
else
prio = 0;
if (!all) {
if (!prio)
return 0;
if (!tags && prio < 2)
return 0;
}
add_to_known_names(all ? path + 5 : path + 10, commit, prio);
return 0;
}
static int compare_names(const void *_a, const void *_b)
{
struct commit_name *a = *(struct commit_name **)_a;
struct commit_name *b = *(struct commit_name **)_b;
unsigned long a_date = a->commit->date;
unsigned long b_date = b->commit->date;
if (a->prio != b->prio)
return b->prio - a->prio;
return (a_date > b_date) ? -1 : (a_date == b_date) ? 0 : 1;
}
struct possible_tag {
struct possible_tag *next;
struct commit_name *name;
unsigned long depth;
};
static void describe(const char *arg, int last_one)
{
unsigned char sha1[20];
struct commit *cmit;
struct commit_list *list;
static int initialized = 0;
struct commit_name *n;
struct possible_tag *all_matches, *min_match, *cur_match;
if (get_sha1(arg, sha1))
die("Not a valid object name %s", arg);
cmit = lookup_commit_reference(sha1);
if (!cmit)
die("%s is not a valid '%s' object", arg, commit_type);
if (!initialized) {
unsigned int m;
initialized = 1;
for_each_ref(get_name, NULL);
for (m = 0; m < ARRAY_SIZE(name_array); m++)
qsort(name_array[m], names[m],
sizeof(*name_array[m]), compare_names);
}
n = match(cmit);
if (n) {
printf("%s\n", n->path);
return;
}
list = NULL;
all_matches = NULL;
cur_match = NULL;
commit_list_insert(cmit, &list);
while (list) {
struct commit *c = pop_commit(&list);
struct commit_list *parents = c->parents;
n = match(c);
if (n) {
struct possible_tag *p = xmalloc(sizeof(*p));
p->name = n;
p->next = NULL;
if (cur_match)
cur_match->next = p;
else
all_matches = p;
cur_match = p;
if (n->prio == 2)
continue;
}
while (parents) {
struct commit *p = parents->item;
parse_commit(p);
if (!(p->object.flags & SEEN)) {
p->object.flags |= SEEN;
insert_by_date(p, &list);
}
parents = parents->next;
}
}
if (!all_matches)
die("cannot describe '%s'", sha1_to_hex(cmit->object.sha1));
min_match = NULL;
for (cur_match = all_matches; cur_match; cur_match = cur_match->next) {
struct rev_info revs;
struct commit *tagged = cur_match->name->commit;
clear_commit_marks(cmit, -1);
init_revisions(&revs, NULL);
tagged->object.flags |= UNINTERESTING;
add_pending_object(&revs, &tagged->object, NULL);
add_pending_object(&revs, &cmit->object, NULL);
prepare_revision_walk(&revs);
cur_match->depth = 0;
while ((!min_match || cur_match->depth < min_match->depth)
&& get_revision(&revs))
cur_match->depth++;
if (!min_match || (cur_match->depth < min_match->depth
&& cur_match->name->prio >= min_match->name->prio))
min_match = cur_match;
free_commit_list(revs.commits);
}
printf("%s-g%s\n", min_match->name->path,
find_unique_abbrev(cmit->object.sha1, abbrev));
if (!last_one) {
for (cur_match = all_matches; cur_match; cur_match = min_match) {
min_match = cur_match->next;
free(cur_match);
}
clear_commit_marks(cmit, SEEN);
}
}
int cmd_describe(int argc, const char **argv, const char *prefix)
{
int i;
for (i = 1; i < argc; i++) {
const char *arg = argv[i];
if (*arg != '-')
break;
else if (!strcmp(arg, "--all"))
all = 1;
else if (!strcmp(arg, "--tags"))
tags = 1;
else if (!strncmp(arg, "--abbrev=", 9)) {
abbrev = strtoul(arg + 9, NULL, 10);
if (abbrev < MINIMUM_ABBREV || 40 < abbrev)
abbrev = DEFAULT_ABBREV;
}
else
usage(describe_usage);
}
save_commit_buffer = 0;
if (argc <= i)
describe("HEAD", 1);
else
while (i < argc) {
describe(argv[i], (i == argc - 1));
i++;
}
return 0;
}
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