Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
Fetching contributors…

Cannot retrieve contributors at this time

411 lines (352 sloc) 9.752 kb
#include "builtin.h"
#include "cache.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;
int generation;
int distance;
} rev_name;
static long cutoff = LONG_MAX;
/* How many generations are maximally preferred over _one_ merge traversal? */
#define MERGE_TRAVERSAL_WEIGHT 65535
static void name_rev(struct commit *commit,
const char *tip_name, int generation, int distance,
int deref)
{
struct rev_name *name = (struct rev_name *)commit->util;
struct commit_list *parents;
int parent_number = 1;
parse_commit(commit);
if (commit->date < cutoff)
return;
if (deref) {
tip_name = 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 (name->distance > distance) {
copy_data:
name->tip_name = tip_name;
name->generation = generation;
name->distance = distance;
} else
return;
for (parents = commit->parents;
parents;
parents = parents->next, parent_number++) {
if (parent_number > 1) {
int len = strlen(tip_name);
char *new_name = xmalloc(len +
1 + decimal_length(generation) + /* ~<n> */
1 + 2 + /* ^NN */
1);
if (len > 2 && !strcmp(tip_name + len - 2, "^0"))
len -= 2;
if (generation > 0)
sprintf(new_name, "%.*s~%d^%d", len, tip_name,
generation, parent_number);
else
sprintf(new_name, "%.*s^%d", len, tip_name,
parent_number);
name_rev(parents->item, new_name, 0,
distance + MERGE_TRAVERSAL_WEIGHT, 0);
} else {
name_rev(parents->item, tip_name, generation + 1,
distance + 1, 0);
}
}
}
static int subpath_matches(const char *path, const char *filter)
{
const char *subpath = path;
while (subpath) {
if (!wildmatch(filter, subpath, 0, NULL))
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;
const char *ref_filter;
};
static struct tip_table {
struct tip_table_entry {
unsigned char sha1[20];
const char *refname;
} *table;
int nr;
int alloc;
int sorted;
} tip_table;
static void add_to_tip_table(const unsigned char *sha1, 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);
hashcpy(tip_table.table[tip_table.nr].sha1, sha1);
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 hashcmp(a->sha1, b->sha1);
}
static int name_ref(const char *path, const unsigned char *sha1, int flags, void *cb_data)
{
struct object *o = parse_object(sha1);
struct name_ref_data *data = cb_data;
int can_abbreviate_output = data->tags_only && data->name_only;
int deref = 0;
if (data->tags_only && !starts_with(path, "refs/tags/"))
return 0;
if (data->ref_filter) {
switch (subpath_matches(path, data->ref_filter)) {
case -1: /* did not match */
return 0;
case 0: /* matched fully */
break;
default: /* matched subpath */
can_abbreviate_output = 1;
break;
}
}
add_to_tip_table(sha1, 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->sha1);
deref = 1;
}
if (o && o->type == OBJ_COMMIT) {
struct commit *commit = (struct commit *)o;
path = name_ref_abbrev(path, can_abbreviate_output);
name_rev(commit, xstrdup(path), 0, 0, 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].sha1;
}
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, sizeof(*tip_table.table),
tipcmp);
tip_table.sorted = 1;
}
found = sha1_pos(o->sha1, tip_table.table, tip_table.nr,
nth_tip_table_ent);
if (0 <= found)
return tip_table.table[found].refname;
return NULL;
}
/* returns a static buffer */
static const char *get_rev_name(const struct object *o)
{
static char buffer[1024];
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;
snprintf(buffer, sizeof(buffer), "%.*s~%d", len, n->tip_name,
n->generation);
return buffer;
}
}
static void show_name(const struct object *obj,
const char *caller_name,
int always, int allow_undefined, int name_only)
{
const char *name;
const unsigned char *sha1 = obj->sha1;
if (!name_only)
printf("%s ", caller_name ? caller_name : sha1_to_hex(sha1));
name = get_rev_name(obj);
if (name)
printf("%s\n", name);
else if (allow_undefined)
printf("undefined\n");
else if (always)
printf("%s\n", find_unique_abbrev(sha1, DEFAULT_ABBREV));
else
die("cannot describe '%s'", sha1_to_hex(sha1));
}
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)
{
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 == 40 &&
!ishex(*(p+1))) {
unsigned char sha1[40];
const char *name = NULL;
char c = *(p+1);
int p_len = p - p_start + 1;
forty = 0;
*(p+1) = 0;
if (!get_sha1(p - 39, sha1)) {
struct object *o =
lookup_object(sha1);
if (o)
name = get_rev_name(o);
}
*(p+1) = c;
if (!name)
continue;
if (data->name_only)
printf("%.*s%s", p_len - 40, 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);
}
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, NULL };
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(0, "refs", &data.ref_filter, N_("pattern"),
N_("only use 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++) {
unsigned char sha1[20];
struct object *object;
struct commit *commit;
if (get_sha1(*argv, sha1)) {
fprintf(stderr, "Could not get sha1 for %s. Skipping.\n",
*argv);
continue;
}
commit = NULL;
object = parse_object(sha1);
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);
}
return 0;
}
Jump to Line
Something went wrong with that request. Please try again.