builtin/name-rev.c

   1 #include "builtin.h"
   2 #include "cache.h"
   3 #include "commit.h"
   4 #include "tag.h"
   5 #include "refs.h"
   6 #include "parse-options.h"
   7 #include "sha1-lookup.h"
   8
   9 #define CUTOFF_DATE_SLOP 86400 /* one day */
  10
  11 typedef struct rev_name {
  12         const char *tip_name;
  13         unsigned long taggerdate;
  14         int generation;
  15         int distance;
  16 } rev_name;
  17
  18 static long cutoff = LONG_MAX;
  19
  20 /* How many generations are maximally preferred over _one_ merge traversal? */
  21 #define MERGE_TRAVERSAL_WEIGHT 65535
  22
  23 static void name_rev(struct commit *commit,
  24                 const char *tip_name, unsigned long taggerdate,
  25                 int generation, int distance,
  26                 int deref)
  27 {
  28         struct rev_name *name = (struct rev_name *)commit->util;
  29         struct commit_list *parents;
  30         int parent_number = 1;
  31
  32         parse_commit(commit);
  33
  34         if (commit->date < cutoff)
  35                 return;
  36
  37         if (deref) {
  38                 tip_name = xstrfmt("%s^0", tip_name);
  39
  40                 if (generation)
  41                         die("generation: %d, but deref?", generation);
  42         }
  43
  44         if (name == NULL) {
  45                 name = xmalloc(sizeof(rev_name));
  46                 commit->util = name;
  47                 goto copy_data;
  48         } else if (name->taggerdate > taggerdate ||
  49                         (name->taggerdate == taggerdate &&
  50                          name->distance > distance)) {
  51 copy_data:
  52                 name->tip_name = tip_name;
  53                 name->taggerdate = taggerdate;
  54                 name->generation = generation;
  55                 name->distance = distance;
  56         } else
  57                 return;
  58
  59         for (parents = commit->parents;
  60                         parents;
  61                         parents = parents->next, parent_number++) {
  62                 if (parent_number > 1) {
  63                         size_t len;
  64                         char *new_name;
  65
  66                         strip_suffix(tip_name, "^0", &len);
  67                         if (generation > 0)
  68                                 new_name = xstrfmt("%.*s~%d^%d", (int)len, tip_name,
  69                                                    generation, parent_number);
  70                         else
  71                                 new_name = xstrfmt("%.*s^%d", (int)len, tip_name,
  72                                                    parent_number);
  73
  74                         name_rev(parents->item, new_name, taggerdate, 0,
  75                                 distance + MERGE_TRAVERSAL_WEIGHT, 0);
  76                 } else {
  77                         name_rev(parents->item, tip_name, taggerdate,
  78                                 generation + 1, distance + 1, 0);
  79                 }
  80         }
  81 }
  82
  83 static int subpath_matches(const char *path, const char *filter)
  84 {
  85         const char *subpath = path;
  86
  87         while (subpath) {
  88                 if (!wildmatch(filter, subpath, 0, NULL))
  89                         return subpath - path;
  90                 subpath = strchr(subpath, '/');
  91                 if (subpath)
  92                         subpath++;
  93         }
  94         return -1;
  95 }
  96
  97 static const char *name_ref_abbrev(const char *refname, int shorten_unambiguous)
  98 {
  99         if (shorten_unambiguous)
 100                 refname = shorten_unambiguous_ref(refname, 0);
 101         else if (starts_with(refname, "refs/heads/"))
 102                 refname = refname + 11;
 103         else if (starts_with(refname, "refs/"))
 104                 refname = refname + 5;
 105         return refname;
 106 }
 107
 108 struct name_ref_data {
 109         int tags_only;
 110         int name_only;
 111         struct string_list ref_filters;
 112         struct string_list exclude_filters;
 113 };
 114
 115 static struct tip_table {
 116         struct tip_table_entry {
 117                 unsigned char sha1[20];
 118                 const char *refname;
 119         } *table;
 120         int nr;
 121         int alloc;
 122         int sorted;
 123 } tip_table;
 124
 125 static void add_to_tip_table(const unsigned char *sha1, const char *refname,
 126                              int shorten_unambiguous)
 127 {
 128         refname = name_ref_abbrev(refname, shorten_unambiguous);
 129
 130         ALLOC_GROW(tip_table.table, tip_table.nr + 1, tip_table.alloc);
 131         hashcpy(tip_table.table[tip_table.nr].sha1, sha1);
 132         tip_table.table[tip_table.nr].refname = xstrdup(refname);
 133         tip_table.nr++;
 134         tip_table.sorted = 0;
 135 }
 136
 137 static int tipcmp(const void *a_, const void *b_)
 138 {
 139         const struct tip_table_entry *a = a_, *b = b_;
 140         return hashcmp(a->sha1, b->sha1);
 141 }
 142
 143 static int name_ref(const char *path, const struct object_id *oid, int flags, void *cb_data)
 144 {
 145         struct object *o = parse_object(oid->hash);
 146         struct name_ref_data *data = cb_data;
 147         int can_abbreviate_output = data->tags_only && data->name_only;
 148         int deref = 0;
 149         unsigned long taggerdate = ULONG_MAX;
 150
 151         if (data->tags_only && !starts_with(path, "refs/tags/"))
 152                 return 0;
 153
 154         if (data->exclude_filters.nr) {
 155                 struct string_list_item *item;
 156
 157                 for_each_string_list_item(item, &data->exclude_filters) {
 158                         if (subpath_matches(path, item->string) >= 0)
 159                                 return 0;
 160                 }
 161         }
 162
 163         if (data->ref_filters.nr) {
 164                 struct string_list_item *item;
 165                 int matched = 0;
 166
 167                 /* See if any of the patterns match. */
 168                 for_each_string_list_item(item, &data->ref_filters) {
 169                         /*
 170                          * Check all patterns even after finding a match, so
 171                          * that we can see if a match with a subpath exists.
 172                          * When a user asked for 'refs/tags/v*' and 'v1.*',
 173                          * both of which match, the user is showing her
 174                          * willingness to accept a shortened output by having
 175                          * the 'v1.*' in the acceptable refnames, so we
 176                          * shouldn't stop when seeing 'refs/tags/v1.4' matches
 177                          * 'refs/tags/v*'.  We should show it as 'v1.4'.
 178                          */
 179                         switch (subpath_matches(path, item->string)) {
 180                         case -1: /* did not match */
 181                                 break;
 182                         case 0: /* matched fully */
 183                                 matched = 1;
 184                                 break;
 185                         default: /* matched subpath */
 186                                 matched = 1;
 187                                 can_abbreviate_output = 1;
 188                                 break;
 189                         }
 190                 }
 191
 192                 /* If none of the patterns matched, stop now */
 193                 if (!matched)
 194                         return 0;
 195         }
 196
 197         add_to_tip_table(oid->hash, path, can_abbreviate_output);
 198
 199         while (o && o->type == OBJ_TAG) {
 200                 struct tag *t = (struct tag *) o;
 201                 if (!t->tagged)
 202                         break; /* broken repository */
 203                 o = parse_object(t->tagged->oid.hash);
 204                 deref = 1;
 205                 taggerdate = t->date;
 206         }
 207         if (o && o->type == OBJ_COMMIT) {
 208                 struct commit *commit = (struct commit *)o;
 209
 210                 path = name_ref_abbrev(path, can_abbreviate_output);
 211                 name_rev(commit, xstrdup(path), taggerdate, 0, 0, deref);
 212         }
 213         return 0;
 214 }
 215
 216 static const unsigned char *nth_tip_table_ent(size_t ix, void *table_)
 217 {
 218         struct tip_table_entry *table = table_;
 219         return table[ix].sha1;
 220 }
 221
 222 static const char *get_exact_ref_match(const struct object *o)
 223 {
 224         int found;
 225
 226         if (!tip_table.table || !tip_table.nr)
 227                 return NULL;
 228
 229         if (!tip_table.sorted) {
 230                 QSORT(tip_table.table, tip_table.nr, tipcmp);
 231                 tip_table.sorted = 1;
 232         }
 233
 234         found = sha1_pos(o->oid.hash, tip_table.table, tip_table.nr,
 235                          nth_tip_table_ent);
 236         if (0 <= found)
 237                 return tip_table.table[found].refname;
 238         return NULL;
 239 }
 240
 241 /* may return a constant string or use "buf" as scratch space */
 242 static const char *get_rev_name(const struct object *o, struct strbuf *buf)
 243 {
 244         struct rev_name *n;
 245         struct commit *c;
 246
 247         if (o->type != OBJ_COMMIT)
 248                 return get_exact_ref_match(o);
 249         c = (struct commit *) o;
 250         n = c->util;
 251         if (!n)
 252                 return NULL;
 253
 254         if (!n->generation)
 255                 return n->tip_name;
 256         else {
 257                 int len = strlen(n->tip_name);
 258                 if (len > 2 && !strcmp(n->tip_name + len - 2, "^0"))
 259                         len -= 2;
 260                 strbuf_reset(buf);
 261                 strbuf_addf(buf, "%.*s~%d", len, n->tip_name, n->generation);
 262                 return buf->buf;
 263         }
 264 }
 265
 266 static void show_name(const struct object *obj,
 267                       const char *caller_name,
 268                       int always, int allow_undefined, int name_only)
 269 {
 270         const char *name;
 271         const struct object_id *oid = &obj->oid;
 272         struct strbuf buf = STRBUF_INIT;
 273
 274         if (!name_only)
 275                 printf("%s ", caller_name ? caller_name : oid_to_hex(oid));
 276         name = get_rev_name(obj, &buf);
 277         if (name)
 278                 printf("%s\n", name);
 279         else if (allow_undefined)
 280                 printf("undefined\n");
 281         else if (always)
 282                 printf("%s\n", find_unique_abbrev(oid->hash, DEFAULT_ABBREV));
 283         else
 284                 die("cannot describe '%s'", oid_to_hex(oid));
 285         strbuf_release(&buf);
 286 }
 287
 288 static char const * const name_rev_usage[] = {
 289         N_("git name-rev [<options>] <commit>..."),
 290         N_("git name-rev [<options>] --all"),
 291         N_("git name-rev [<options>] --stdin"),
 292         NULL
 293 };
 294
 295 static void name_rev_line(char *p, struct name_ref_data *data)
 296 {
 297         struct strbuf buf = STRBUF_INIT;
 298         int forty = 0;
 299         char *p_start;
 300         for (p_start = p; *p; p++) {
 301 #define ishex(x) (isdigit((x)) || ((x) >= 'a' && (x) <= 'f'))
 302                 if (!ishex(*p))
 303                         forty = 0;
 304                 else if (++forty == 40 &&
 305                          !ishex(*(p+1))) {
 306                         unsigned char sha1[40];
 307                         const char *name = NULL;
 308                         char c = *(p+1);
 309                         int p_len = p - p_start + 1;
 310
 311                         forty = 0;
 312
 313                         *(p+1) = 0;
 314                         if (!get_sha1(p - 39, sha1)) {
 315                                 struct object *o =
 316                                         lookup_object(sha1);
 317                                 if (o)
 318                                         name = get_rev_name(o, &buf);
 319                         }
 320                         *(p+1) = c;
 321
 322                         if (!name)
 323                                 continue;
 324
 325                         if (data->name_only)
 326                                 printf("%.*s%s", p_len - 40, p_start, name);
 327                         else
 328                                 printf("%.*s (%s)", p_len, p_start, name);
 329                         p_start = p + 1;
 330                 }
 331         }
 332
 333         /* flush */
 334         if (p_start != p)
 335                 fwrite(p_start, p - p_start, 1, stdout);
 336
 337         strbuf_release(&buf);
 338 }
 339
 340 int cmd_name_rev(int argc, const char **argv, const char *prefix)
 341 {
 342         struct object_array revs = OBJECT_ARRAY_INIT;
 343         int all = 0, transform_stdin = 0, allow_undefined = 1, always = 0, peel_tag = 0;
 344         struct name_ref_data data = { 0, 0, STRING_LIST_INIT_NODUP, STRING_LIST_INIT_NODUP };
 345         struct option opts[] = {
 346                 OPT_BOOL(0, "name-only", &data.name_only, N_("print only names (no SHA-1)")),
 347                 OPT_BOOL(0, "tags", &data.tags_only, N_("only use tags to name the commits")),
 348                 OPT_STRING_LIST(0, "refs", &data.ref_filters, N_("pattern"),
 349                                    N_("only use refs matching <pattern>")),
 350                 OPT_STRING_LIST(0, "exclude", &data.exclude_filters, N_("pattern"),
 351                                    N_("ignore refs matching <pattern>")),
 352                 OPT_GROUP(""),
 353                 OPT_BOOL(0, "all", &all, N_("list all commits reachable from all refs")),
 354                 OPT_BOOL(0, "stdin", &transform_stdin, N_("read from stdin")),
 355                 OPT_BOOL(0, "undefined", &allow_undefined, N_("allow to print `undefined` names (default)")),
 356                 OPT_BOOL(0, "always",     &always,
 357                            N_("show abbreviated commit object as fallback")),
 358                 {
 359                         /* A Hidden OPT_BOOL */
 360                         OPTION_SET_INT, 0, "peel-tag", &peel_tag, NULL,
 361                         N_("dereference tags in the input (internal use)"),
 362                         PARSE_OPT_NOARG | PARSE_OPT_HIDDEN, NULL, 1,
 363                 },
 364                 OPT_END(),
 365         };
 366
 367         git_config(git_default_config, NULL);
 368         argc = parse_options(argc, argv, prefix, opts, name_rev_usage, 0);
 369         if (all + transform_stdin + !!argc > 1) {
 370                 error("Specify either a list, or --all, not both!");
 371                 usage_with_options(name_rev_usage, opts);
 372         }
 373         if (all || transform_stdin)
 374                 cutoff = 0;
 375
 376         for (; argc; argc--, argv++) {
 377                 unsigned char sha1[20];
 378                 struct object *object;
 379                 struct commit *commit;
 380
 381                 if (get_sha1(*argv, sha1)) {
 382                         fprintf(stderr, "Could not get sha1 for %s. Skipping.\n",
 383                                         *argv);
 384                         continue;
 385                 }
 386
 387                 commit = NULL;
 388                 object = parse_object(sha1);
 389                 if (object) {
 390                         struct object *peeled = deref_tag(object, *argv, 0);
 391                         if (peeled && peeled->type == OBJ_COMMIT)
 392                                 commit = (struct commit *)peeled;
 393                 }
 394
 395                 if (!object) {
 396                         fprintf(stderr, "Could not get object for %s. Skipping.\n",
 397                                         *argv);
 398                         continue;
 399                 }
 400
 401                 if (commit) {
 402                         if (cutoff > commit->date)
 403                                 cutoff = commit->date;
 404                 }
 405
 406                 if (peel_tag) {
 407                         if (!commit) {
 408                                 fprintf(stderr, "Could not get commit for %s. Skipping.\n",
 409                                         *argv);
 410                                 continue;
 411                         }
 412                         object = (struct object *)commit;
 413                 }
 414                 add_object_array(object, *argv, &revs);
 415         }
 416
 417         if (cutoff)
 418                 cutoff = cutoff - CUTOFF_DATE_SLOP;
 419         for_each_ref(name_ref, &data);
 420
 421         if (transform_stdin) {
 422                 char buffer[2048];
 423
 424                 while (!feof(stdin)) {
 425                         char *p = fgets(buffer, sizeof(buffer), stdin);
 426                         if (!p)
 427                                 break;
 428                         name_rev_line(p, &data);
 429                 }
 430         } else if (all) {
 431                 int i, max;
 432
 433                 max = get_max_object_index();
 434                 for (i = 0; i < max; i++) {
 435                         struct object *obj = get_indexed_object(i);
 436                         if (!obj || obj->type != OBJ_COMMIT)
 437                                 continue;
 438                         show_name(obj, NULL,
 439                                   always, allow_undefined, data.name_only);
 440                 }
 441         } else {
 442                 int i;
 443                 for (i = 0; i < revs.nr; i++)
 444                         show_name(revs.objects[i].item, revs.objects[i].name,
 445                                   always, allow_undefined, data.name_only);
 446         }
 447
 448         return 0;
 449 }