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git/builtin/name-rev.c

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#include "builtin.h"
#include "cache.h"
#include "config.h"
#include "commit.h"
#include "tag.h"
#include "refs.h"
#include "parse-options.h"
#include "sha1-lookup.h"
#define CUTOFF_DATE_SLOP 86400 /* one day */
typedef struct rev_name {
const char *tip_name;
timestamp_t taggerdate;
int generation;
int distance;
int from_tag;
} rev_name;
static timestamp_t cutoff = TIME_MAX;
/* How many generations are maximally preferred over _one_ merge traversal? */
#define MERGE_TRAVERSAL_WEIGHT 65535
static int is_better_name(struct rev_name *name,
const char *tip_name,
timestamp_t taggerdate,
int generation,
int distance,
int from_tag)
{
/*
* When comparing names based on tags, prefer names
* based on the older tag, even if it is farther away.
*/
if (from_tag && name->from_tag)
return (name->taggerdate > taggerdate ||
(name->taggerdate == taggerdate &&
name->distance > distance));
/*
* We know that at least one of them is a non-tag at this point.
* favor a tag over a non-tag.
*/
if (name->from_tag != from_tag)
return from_tag;
/*
* We are now looking at two non-tags. Tiebreak to favor
* shorter hops.
*/
if (name->distance != distance)
return name->distance > distance;
/* ... or tiebreak to favor older date */
if (name->taggerdate != taggerdate)
return name->taggerdate > taggerdate;
/* keep the current one if we cannot decide */
return 0;
}
static void name_rev(struct commit *commit,
const char *tip_name, timestamp_t taggerdate,
int generation, int distance, int from_tag,
int deref)
{
struct rev_name *name = (struct rev_name *)commit->util;
struct commit_list *parents;
int parent_number = 1;
char *to_free = NULL;
parse_commit(commit);
if (commit->date < cutoff)
return;
if (deref) {
tip_name = to_free = xstrfmt("%s^0", tip_name);
if (generation)
die("generation: %d, but deref?", generation);
}
if (name == NULL) {
name = xmalloc(sizeof(rev_name));
commit->util = name;
goto copy_data;
} else if (is_better_name(name, tip_name, taggerdate,
generation, distance, from_tag)) {
copy_data:
name->tip_name = tip_name;
name->taggerdate = taggerdate;
name->generation = generation;
name->distance = distance;
name->from_tag = from_tag;
} else {
free(to_free);
return;
}
for (parents = commit->parents;
parents;
parents = parents->next, parent_number++) {
if (parent_number > 1) {
size_t len;
char *new_name;
strip_suffix(tip_name, "^0", &len);
if (generation > 0)
new_name = xstrfmt("%.*s~%d^%d", (int)len, tip_name,
generation, parent_number);
else
new_name = xstrfmt("%.*s^%d", (int)len, tip_name,
parent_number);
name_rev(parents->item, new_name, taggerdate, 0,
distance + MERGE_TRAVERSAL_WEIGHT,
from_tag, 0);
} else {
name_rev(parents->item, tip_name, taggerdate,
generation + 1, distance + 1,
from_tag, 0);
}
}
}
static int subpath_matches(const char *path, const char *filter)
{
const char *subpath = path;
while (subpath) {
if (!wildmatch(filter, subpath, 0))
return subpath - path;
subpath = strchr(subpath, '/');
if (subpath)
subpath++;
}
return -1;
}
static const char *name_ref_abbrev(const char *refname, int shorten_unambiguous)
{
if (shorten_unambiguous)
refname = shorten_unambiguous_ref(refname, 0);
else if (starts_with(refname, "refs/heads/"))
refname = refname + 11;
else if (starts_with(refname, "refs/"))
refname = refname + 5;
return refname;
}
struct name_ref_data {
int tags_only;
int name_only;
struct string_list ref_filters;
struct string_list exclude_filters;
};
static struct tip_table {
struct tip_table_entry {
struct object_id oid;
const char *refname;
} *table;
int nr;
int alloc;
int sorted;
} tip_table;
static void add_to_tip_table(const struct object_id *oid, const char *refname,
int shorten_unambiguous)
{
refname = name_ref_abbrev(refname, shorten_unambiguous);
ALLOC_GROW(tip_table.table, tip_table.nr + 1, tip_table.alloc);
oidcpy(&tip_table.table[tip_table.nr].oid, oid);
tip_table.table[tip_table.nr].refname = xstrdup(refname);
tip_table.nr++;
tip_table.sorted = 0;
}
static int tipcmp(const void *a_, const void *b_)
{
const struct tip_table_entry *a = a_, *b = b_;
return oidcmp(&a->oid, &b->oid);
}
static int name_ref(const char *path, const struct object_id *oid, int flags, void *cb_data)
{
struct object *o = parse_object(oid);
struct name_ref_data *data = cb_data;
int can_abbreviate_output = data->tags_only && data->name_only;
int deref = 0;
timestamp_t taggerdate = TIME_MAX;
if (data->tags_only && !starts_with(path, "refs/tags/"))
return 0;
if (data->exclude_filters.nr) {
struct string_list_item *item;
for_each_string_list_item(item, &data->exclude_filters) {
if (subpath_matches(path, item->string) >= 0)
return 0;
}
}
if (data->ref_filters.nr) {
struct string_list_item *item;
int matched = 0;
/* See if any of the patterns match. */
for_each_string_list_item(item, &data->ref_filters) {
/*
* Check all patterns even after finding a match, so
* that we can see if a match with a subpath exists.
* When a user asked for 'refs/tags/v*' and 'v1.*',
* both of which match, the user is showing her
* willingness to accept a shortened output by having
* the 'v1.*' in the acceptable refnames, so we
* shouldn't stop when seeing 'refs/tags/v1.4' matches
* 'refs/tags/v*'. We should show it as 'v1.4'.
*/
switch (subpath_matches(path, item->string)) {
case -1: /* did not match */
break;
case 0: /* matched fully */
matched = 1;
break;
default: /* matched subpath */
matched = 1;
can_abbreviate_output = 1;
break;
}
}
/* If none of the patterns matched, stop now */
if (!matched)
return 0;
}
add_to_tip_table(oid, path, can_abbreviate_output);
while (o && o->type == OBJ_TAG) {
struct tag *t = (struct tag *) o;
if (!t->tagged)
break; /* broken repository */
o = parse_object(&t->tagged->oid);
deref = 1;
taggerdate = t->date;
}
if (o && o->type == OBJ_COMMIT) {
struct commit *commit = (struct commit *)o;
int from_tag = starts_with(path, "refs/tags/");
if (taggerdate == TIME_MAX)
taggerdate = ((struct commit *)o)->date;
path = name_ref_abbrev(path, can_abbreviate_output);
name_rev(commit, xstrdup(path), taggerdate, 0, 0,
from_tag, deref);
}
return 0;
}
static const unsigned char *nth_tip_table_ent(size_t ix, void *table_)
{
struct tip_table_entry *table = table_;
return table[ix].oid.hash;
}
static const char *get_exact_ref_match(const struct object *o)
{
int found;
if (!tip_table.table || !tip_table.nr)
return NULL;
if (!tip_table.sorted) {
QSORT(tip_table.table, tip_table.nr, tipcmp);
tip_table.sorted = 1;
}
found = sha1_pos(o->oid.hash, tip_table.table, tip_table.nr,
nth_tip_table_ent);
if (0 <= found)
return tip_table.table[found].refname;
return NULL;
}
/* may return a constant string or use "buf" as scratch space */
static const char *get_rev_name(const struct object *o, struct strbuf *buf)
{
struct rev_name *n;
struct commit *c;
if (o->type != OBJ_COMMIT)
return get_exact_ref_match(o);
c = (struct commit *) o;
n = c->util;
if (!n)
return NULL;
if (!n->generation)
return n->tip_name;
else {
int len = strlen(n->tip_name);
if (len > 2 && !strcmp(n->tip_name + len - 2, "^0"))
len -= 2;
strbuf_reset(buf);
strbuf_addf(buf, "%.*s~%d", len, n->tip_name, n->generation);
return buf->buf;
}
}
static void show_name(const struct object *obj,
const char *caller_name,
int always, int allow_undefined, int name_only)
{
const char *name;
const struct object_id *oid = &obj->oid;
struct strbuf buf = STRBUF_INIT;
if (!name_only)
printf("%s ", caller_name ? caller_name : oid_to_hex(oid));
name = get_rev_name(obj, &buf);
if (name)
printf("%s\n", name);
else if (allow_undefined)
printf("undefined\n");
else if (always)
printf("%s\n", find_unique_abbrev(oid->hash, DEFAULT_ABBREV));
else
die("cannot describe '%s'", oid_to_hex(oid));
strbuf_release(&buf);
}
static char const * const name_rev_usage[] = {
N_("git name-rev [<options>] <commit>..."),
N_("git name-rev [<options>] --all"),
N_("git name-rev [<options>] --stdin"),
NULL
};
static void name_rev_line(char *p, struct name_ref_data *data)
{
struct strbuf buf = STRBUF_INIT;
int forty = 0;
char *p_start;
for (p_start = p; *p; p++) {
#define ishex(x) (isdigit((x)) || ((x) >= 'a' && (x) <= 'f'))
if (!ishex(*p))
forty = 0;
else if (++forty == GIT_SHA1_HEXSZ &&
!ishex(*(p+1))) {
struct object_id oid;
const char *name = NULL;
char c = *(p+1);
int p_len = p - p_start + 1;
forty = 0;
*(p+1) = 0;
if (!get_oid(p - (GIT_SHA1_HEXSZ - 1), &oid)) {
struct object *o =
lookup_object(oid.hash);
if (o)
name = get_rev_name(o, &buf);
}
*(p+1) = c;
if (!name)
continue;
if (data->name_only)
printf("%.*s%s", p_len - GIT_SHA1_HEXSZ, p_start, name);
else
printf("%.*s (%s)", p_len, p_start, name);
p_start = p + 1;
}
}
/* flush */
if (p_start != p)
fwrite(p_start, p - p_start, 1, stdout);
strbuf_release(&buf);
}
int cmd_name_rev(int argc, const char **argv, const char *prefix)
{
struct object_array revs = OBJECT_ARRAY_INIT;
int all = 0, transform_stdin = 0, allow_undefined = 1, always = 0, peel_tag = 0;
struct name_ref_data data = { 0, 0, STRING_LIST_INIT_NODUP, STRING_LIST_INIT_NODUP };
struct option opts[] = {
OPT_BOOL(0, "name-only", &data.name_only, N_("print only names (no SHA-1)")),
OPT_BOOL(0, "tags", &data.tags_only, N_("only use tags to name the commits")),
OPT_STRING_LIST(0, "refs", &data.ref_filters, N_("pattern"),
N_("only use refs matching <pattern>")),
OPT_STRING_LIST(0, "exclude", &data.exclude_filters, N_("pattern"),
N_("ignore refs matching <pattern>")),
OPT_GROUP(""),
OPT_BOOL(0, "all", &all, N_("list all commits reachable from all refs")),
OPT_BOOL(0, "stdin", &transform_stdin, N_("read from stdin")),
OPT_BOOL(0, "undefined", &allow_undefined, N_("allow to print `undefined` names (default)")),
OPT_BOOL(0, "always", &always,
N_("show abbreviated commit object as fallback")),
{
/* A Hidden OPT_BOOL */
OPTION_SET_INT, 0, "peel-tag", &peel_tag, NULL,
N_("dereference tags in the input (internal use)"),
PARSE_OPT_NOARG | PARSE_OPT_HIDDEN, NULL, 1,
},
OPT_END(),
};
git_config(git_default_config, NULL);
argc = parse_options(argc, argv, prefix, opts, name_rev_usage, 0);
if (all + transform_stdin + !!argc > 1) {
error("Specify either a list, or --all, not both!");
usage_with_options(name_rev_usage, opts);
}
if (all || transform_stdin)
cutoff = 0;
for (; argc; argc--, argv++) {
struct object_id oid;
struct object *object;
struct commit *commit;
if (get_oid(*argv, &oid)) {
fprintf(stderr, "Could not get sha1 for %s. Skipping.\n",
*argv);
continue;
}
commit = NULL;
object = parse_object(&oid);
if (object) {
struct object *peeled = deref_tag(object, *argv, 0);
if (peeled && peeled->type == OBJ_COMMIT)
commit = (struct commit *)peeled;
}
if (!object) {
fprintf(stderr, "Could not get object for %s. Skipping.\n",
*argv);
continue;
}
if (commit) {
if (cutoff > commit->date)
cutoff = commit->date;
}
if (peel_tag) {
if (!commit) {
fprintf(stderr, "Could not get commit for %s. Skipping.\n",
*argv);
continue;
}
object = (struct object *)commit;
}
add_object_array(object, *argv, &revs);
}
if (cutoff)
cutoff = cutoff - CUTOFF_DATE_SLOP;
for_each_ref(name_ref, &data);
if (transform_stdin) {
char buffer[2048];
while (!feof(stdin)) {
char *p = fgets(buffer, sizeof(buffer), stdin);
if (!p)
break;
name_rev_line(p, &data);
}
} else if (all) {
int i, max;
max = get_max_object_index();
for (i = 0; i < max; i++) {
struct object *obj = get_indexed_object(i);
if (!obj || obj->type != OBJ_COMMIT)
continue;
show_name(obj, NULL,
always, allow_undefined, data.name_only);
}
} else {
int i;
for (i = 0; i < revs.nr; i++)
show_name(revs.objects[i].item, revs.objects[i].name,
always, allow_undefined, data.name_only);
}
UNLEAK(revs);
return 0;
}
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