builtin-for-each-ref.c

   1 #include "builtin.h"
   2 #include "cache.h"
   3 #include "refs.h"
   4 #include "object.h"
   5 #include "tag.h"
   6 #include "commit.h"
   7 #include "tree.h"
   8 #include "blob.h"
   9 #include "quote.h"
  10 #include "parse-options.h"
  11 #include "remote.h"
  12
  13 /* Quoting styles */
  14 #define QUOTE_NONE 0
  15 #define QUOTE_SHELL 1
  16 #define QUOTE_PERL 2
  17 #define QUOTE_PYTHON 4
  18 #define QUOTE_TCL 8
  19
  20 typedef enum { FIELD_STR, FIELD_ULONG, FIELD_TIME } cmp_type;
  21
  22 struct atom_value {
  23         const char *s;
  24         unsigned long ul; /* used for sorting when not FIELD_STR */
  25 };
  26
  27 struct ref_sort {
  28         struct ref_sort *next;
  29         int atom; /* index into used_atom array */
  30         unsigned reverse : 1;
  31 };
  32
  33 struct refinfo {
  34         char *refname;
  35         unsigned char objectname[20];
  36         struct atom_value *value;
  37 };
  38
  39 static struct {
  40         const char *name;
  41         cmp_type cmp_type;
  42 } valid_atom[] = {
  43         { "refname" },
  44         { "objecttype" },
  45         { "objectsize", FIELD_ULONG },
  46         { "objectname" },
  47         { "tree" },
  48         { "parent" },
  49         { "numparent", FIELD_ULONG },
  50         { "object" },
  51         { "type" },
  52         { "tag" },
  53         { "author" },
  54         { "authorname" },
  55         { "authoremail" },
  56         { "authordate", FIELD_TIME },
  57         { "committer" },
  58         { "committername" },
  59         { "committeremail" },
  60         { "committerdate", FIELD_TIME },
  61         { "tagger" },
  62         { "taggername" },
  63         { "taggeremail" },
  64         { "taggerdate", FIELD_TIME },
  65         { "creator" },
  66         { "creatordate", FIELD_TIME },
  67         { "subject" },
  68         { "body" },
  69         { "contents" },
  70         { "upstream" },
  71 };
  72
  73 /*
  74  * An atom is a valid field atom listed above, possibly prefixed with
  75  * a "*" to denote deref_tag().
  76  *
  77  * We parse given format string and sort specifiers, and make a list
  78  * of properties that we need to extract out of objects.  refinfo
  79  * structure will hold an array of values extracted that can be
  80  * indexed with the "atom number", which is an index into this
  81  * array.
  82  */
  83 static const char **used_atom;
  84 static cmp_type *used_atom_type;
  85 static int used_atom_cnt, sort_atom_limit, need_tagged;
  86
  87 /*
  88  * Used to parse format string and sort specifiers
  89  */
  90 static int parse_atom(const char *atom, const char *ep)
  91 {
  92         const char *sp;
  93         int i, at;
  94
  95         sp = atom;
  96         if (*sp == '*' && sp < ep)
  97                 sp++; /* deref */
  98         if (ep <= sp)
  99                 die("malformed field name: %.*s", (int)(ep-atom), atom);
 100
 101         /* Do we have the atom already used elsewhere? */
 102         for (i = 0; i < used_atom_cnt; i++) {
 103                 int len = strlen(used_atom[i]);
 104                 if (len == ep - atom && !memcmp(used_atom[i], atom, len))
 105                         return i;
 106         }
 107
 108         /* Is the atom a valid one? */
 109         for (i = 0; i < ARRAY_SIZE(valid_atom); i++) {
 110                 int len = strlen(valid_atom[i].name);
 111                 /*
 112                  * If the atom name has a colon, strip it and everything after
 113                  * it off - it specifies the format for this entry, and
 114                  * shouldn't be used for checking against the valid_atom
 115                  * table.
 116                  */
 117                 const char *formatp = strchr(sp, ':');
 118                 if (!formatp || ep < formatp)
 119                         formatp = ep;
 120                 if (len == formatp - sp && !memcmp(valid_atom[i].name, sp, len))
 121                         break;
 122         }
 123
 124         if (ARRAY_SIZE(valid_atom) <= i)
 125                 die("unknown field name: %.*s", (int)(ep-atom), atom);
 126
 127         /* Add it in, including the deref prefix */
 128         at = used_atom_cnt;
 129         used_atom_cnt++;
 130         used_atom = xrealloc(used_atom,
 131                              (sizeof *used_atom) * used_atom_cnt);
 132         used_atom_type = xrealloc(used_atom_type,
 133                                   (sizeof(*used_atom_type) * used_atom_cnt));
 134         used_atom[at] = xmemdupz(atom, ep - atom);
 135         used_atom_type[at] = valid_atom[i].cmp_type;
 136         return at;
 137 }
 138
 139 /*
 140  * In a format string, find the next occurrence of %(atom).
 141  */
 142 static const char *find_next(const char *cp)
 143 {
 144         while (*cp) {
 145                 if (*cp == '%') {
 146                         /* %( is the start of an atom;
 147                          * %% is a quoted per-cent.
 148                          */
 149                         if (cp[1] == '(')
 150                                 return cp;
 151                         else if (cp[1] == '%')
 152                                 cp++; /* skip over two % */
 153                         /* otherwise this is a singleton, literal % */
 154                 }
 155                 cp++;
 156         }
 157         return NULL;
 158 }
 159
 160 /*
 161  * Make sure the format string is well formed, and parse out
 162  * the used atoms.
 163  */
 164 static int verify_format(const char *format)
 165 {
 166         const char *cp, *sp;
 167         for (cp = format; *cp && (sp = find_next(cp)); ) {
 168                 const char *ep = strchr(sp, ')');
 169                 if (!ep)
 170                         return error("malformed format string %s", sp);
 171                 /* sp points at "%(" and ep points at the closing ")" */
 172                 parse_atom(sp + 2, ep);
 173                 cp = ep + 1;
 174         }
 175         return 0;
 176 }
 177
 178 /*
 179  * Given an object name, read the object data and size, and return a
 180  * "struct object".  If the object data we are returning is also borrowed
 181  * by the "struct object" representation, set *eaten as well---it is a
 182  * signal from parse_object_buffer to us not to free the buffer.
 183  */
 184 static void *get_obj(const unsigned char *sha1, struct object **obj, unsigned long *sz, int *eaten)
 185 {
 186         enum object_type type;
 187         void *buf = read_sha1_file(sha1, &type, sz);
 188
 189         if (buf)
 190                 *obj = parse_object_buffer(sha1, type, *sz, buf, eaten);
 191         else
 192                 *obj = NULL;
 193         return buf;
 194 }
 195
 196 /* See grab_values */
 197 static void grab_common_values(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 198 {
 199         int i;
 200
 201         for (i = 0; i < used_atom_cnt; i++) {
 202                 const char *name = used_atom[i];
 203                 struct atom_value *v = &val[i];
 204                 if (!!deref != (*name == '*'))
 205                         continue;
 206                 if (deref)
 207                         name++;
 208                 if (!strcmp(name, "objecttype"))
 209                         v->s = typename(obj->type);
 210                 else if (!strcmp(name, "objectsize")) {
 211                         char *s = xmalloc(40);
 212                         sprintf(s, "%lu", sz);
 213                         v->ul = sz;
 214                         v->s = s;
 215                 }
 216                 else if (!strcmp(name, "objectname")) {
 217                         char *s = xmalloc(41);
 218                         strcpy(s, sha1_to_hex(obj->sha1));
 219                         v->s = s;
 220                 }
 221         }
 222 }
 223
 224 /* See grab_values */
 225 static void grab_tag_values(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 226 {
 227         int i;
 228         struct tag *tag = (struct tag *) obj;
 229
 230         for (i = 0; i < used_atom_cnt; i++) {
 231                 const char *name = used_atom[i];
 232                 struct atom_value *v = &val[i];
 233                 if (!!deref != (*name == '*'))
 234                         continue;
 235                 if (deref)
 236                         name++;
 237                 if (!strcmp(name, "tag"))
 238                         v->s = tag->tag;
 239                 else if (!strcmp(name, "type") && tag->tagged)
 240                         v->s = typename(tag->tagged->type);
 241                 else if (!strcmp(name, "object") && tag->tagged) {
 242                         char *s = xmalloc(41);
 243                         strcpy(s, sha1_to_hex(tag->tagged->sha1));
 244                         v->s = s;
 245                 }
 246         }
 247 }
 248
 249 static int num_parents(struct commit *commit)
 250 {
 251         struct commit_list *parents;
 252         int i;
 253
 254         for (i = 0, parents = commit->parents;
 255              parents;
 256              parents = parents->next)
 257                 i++;
 258         return i;
 259 }
 260
 261 /* See grab_values */
 262 static void grab_commit_values(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 263 {
 264         int i;
 265         struct commit *commit = (struct commit *) obj;
 266
 267         for (i = 0; i < used_atom_cnt; i++) {
 268                 const char *name = used_atom[i];
 269                 struct atom_value *v = &val[i];
 270                 if (!!deref != (*name == '*'))
 271                         continue;
 272                 if (deref)
 273                         name++;
 274                 if (!strcmp(name, "tree")) {
 275                         char *s = xmalloc(41);
 276                         strcpy(s, sha1_to_hex(commit->tree->object.sha1));
 277                         v->s = s;
 278                 }
 279                 if (!strcmp(name, "numparent")) {
 280                         char *s = xmalloc(40);
 281                         v->ul = num_parents(commit);
 282                         sprintf(s, "%lu", v->ul);
 283                         v->s = s;
 284                 }
 285                 else if (!strcmp(name, "parent")) {
 286                         int num = num_parents(commit);
 287                         int i;
 288                         struct commit_list *parents;
 289                         char *s = xmalloc(41 * num + 1);
 290                         v->s = s;
 291                         for (i = 0, parents = commit->parents;
 292                              parents;
 293                              parents = parents->next, i = i + 41) {
 294                                 struct commit *parent = parents->item;
 295                                 strcpy(s+i, sha1_to_hex(parent->object.sha1));
 296                                 if (parents->next)
 297                                         s[i+40] = ' ';
 298                         }
 299                         if (!i)
 300                                 *s = '\0';
 301                 }
 302         }
 303 }
 304
 305 static const char *find_wholine(const char *who, int wholen, const char *buf, unsigned long sz)
 306 {
 307         const char *eol;
 308         while (*buf) {
 309                 if (!strncmp(buf, who, wholen) &&
 310                     buf[wholen] == ' ')
 311                         return buf + wholen + 1;
 312                 eol = strchr(buf, '\n');
 313                 if (!eol)
 314                         return "";
 315                 eol++;
 316                 if (*eol == '\n')
 317                         return ""; /* end of header */
 318                 buf = eol;
 319         }
 320         return "";
 321 }
 322
 323 static const char *copy_line(const char *buf)
 324 {
 325         const char *eol = strchrnul(buf, '\n');
 326         return xmemdupz(buf, eol - buf);
 327 }
 328
 329 static const char *copy_name(const char *buf)
 330 {
 331         const char *cp;
 332         for (cp = buf; *cp && *cp != '\n'; cp++) {
 333                 if (!strncmp(cp, " <", 2))
 334                         return xmemdupz(buf, cp - buf);
 335         }
 336         return "";
 337 }
 338
 339 static const char *copy_email(const char *buf)
 340 {
 341         const char *email = strchr(buf, '<');
 342         const char *eoemail;
 343         if (!email)
 344                 return "";
 345         eoemail = strchr(email, '>');
 346         if (!eoemail)
 347                 return "";
 348         return xmemdupz(email, eoemail + 1 - email);
 349 }
 350
 351 static void grab_date(const char *buf, struct atom_value *v, const char *atomname)
 352 {
 353         const char *eoemail = strstr(buf, "> ");
 354         char *zone;
 355         unsigned long timestamp;
 356         long tz;
 357         enum date_mode date_mode = DATE_NORMAL;
 358         const char *formatp;
 359
 360         /*
 361          * We got here because atomname ends in "date" or "date<something>";
 362          * it's not possible that <something> is not ":<format>" because
 363          * parse_atom() wouldn't have allowed it, so we can assume that no
 364          * ":" means no format is specified, and use the default.
 365          */
 366         formatp = strchr(atomname, ':');
 367         if (formatp != NULL) {
 368                 formatp++;
 369                 date_mode = parse_date_format(formatp);
 370         }
 371
 372         if (!eoemail)
 373                 goto bad;
 374         timestamp = strtoul(eoemail + 2, &zone, 10);
 375         if (timestamp == ULONG_MAX)
 376                 goto bad;
 377         tz = strtol(zone, NULL, 10);
 378         if ((tz == LONG_MIN || tz == LONG_MAX) && errno == ERANGE)
 379                 goto bad;
 380         v->s = xstrdup(show_date(timestamp, tz, date_mode));
 381         v->ul = timestamp;
 382         return;
 383  bad:
 384         v->s = "";
 385         v->ul = 0;
 386 }
 387
 388 /* See grab_values */
 389 static void grab_person(const char *who, struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 390 {
 391         int i;
 392         int wholen = strlen(who);
 393         const char *wholine = NULL;
 394
 395         for (i = 0; i < used_atom_cnt; i++) {
 396                 const char *name = used_atom[i];
 397                 struct atom_value *v = &val[i];
 398                 if (!!deref != (*name == '*'))
 399                         continue;
 400                 if (deref)
 401                         name++;
 402                 if (strncmp(who, name, wholen))
 403                         continue;
 404                 if (name[wholen] != 0 &&
 405                     strcmp(name + wholen, "name") &&
 406                     strcmp(name + wholen, "email") &&
 407                     prefixcmp(name + wholen, "date"))
 408                         continue;
 409                 if (!wholine)
 410                         wholine = find_wholine(who, wholen, buf, sz);
 411                 if (!wholine)
 412                         return; /* no point looking for it */
 413                 if (name[wholen] == 0)
 414                         v->s = copy_line(wholine);
 415                 else if (!strcmp(name + wholen, "name"))
 416                         v->s = copy_name(wholine);
 417                 else if (!strcmp(name + wholen, "email"))
 418                         v->s = copy_email(wholine);
 419                 else if (!prefixcmp(name + wholen, "date"))
 420                         grab_date(wholine, v, name);
 421         }
 422
 423         /* For a tag or a commit object, if "creator" or "creatordate" is
 424          * requested, do something special.
 425          */
 426         if (strcmp(who, "tagger") && strcmp(who, "committer"))
 427                 return; /* "author" for commit object is not wanted */
 428         if (!wholine)
 429                 wholine = find_wholine(who, wholen, buf, sz);
 430         if (!wholine)
 431                 return;
 432         for (i = 0; i < used_atom_cnt; i++) {
 433                 const char *name = used_atom[i];
 434                 struct atom_value *v = &val[i];
 435                 if (!!deref != (*name == '*'))
 436                         continue;
 437                 if (deref)
 438                         name++;
 439
 440                 if (!prefixcmp(name, "creatordate"))
 441                         grab_date(wholine, v, name);
 442                 else if (!strcmp(name, "creator"))
 443                         v->s = copy_line(wholine);
 444         }
 445 }
 446
 447 static void find_subpos(const char *buf, unsigned long sz, const char **sub, const char **body)
 448 {
 449         while (*buf) {
 450                 const char *eol = strchr(buf, '\n');
 451                 if (!eol)
 452                         return;
 453                 if (eol[1] == '\n') {
 454                         buf = eol + 1;
 455                         break; /* found end of header */
 456                 }
 457                 buf = eol + 1;
 458         }
 459         while (*buf == '\n')
 460                 buf++;
 461         if (!*buf)
 462                 return;
 463         *sub = buf; /* first non-empty line */
 464         buf = strchr(buf, '\n');
 465         if (!buf) {
 466                 *body = "";
 467                 return; /* no body */
 468         }
 469         while (*buf == '\n')
 470                 buf++; /* skip blank between subject and body */
 471         *body = buf;
 472 }
 473
 474 /* See grab_values */
 475 static void grab_sub_body_contents(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 476 {
 477         int i;
 478         const char *subpos = NULL, *bodypos = NULL;
 479
 480         for (i = 0; i < used_atom_cnt; i++) {
 481                 const char *name = used_atom[i];
 482                 struct atom_value *v = &val[i];
 483                 if (!!deref != (*name == '*'))
 484                         continue;
 485                 if (deref)
 486                         name++;
 487                 if (strcmp(name, "subject") &&
 488                     strcmp(name, "body") &&
 489                     strcmp(name, "contents"))
 490                         continue;
 491                 if (!subpos)
 492                         find_subpos(buf, sz, &subpos, &bodypos);
 493                 if (!subpos)
 494                         return;
 495
 496                 if (!strcmp(name, "subject"))
 497                         v->s = copy_line(subpos);
 498                 else if (!strcmp(name, "body"))
 499                         v->s = xstrdup(bodypos);
 500                 else if (!strcmp(name, "contents"))
 501                         v->s = xstrdup(subpos);
 502         }
 503 }
 504
 505 /* We want to have empty print-string for field requests
 506  * that do not apply (e.g. "authordate" for a tag object)
 507  */
 508 static void fill_missing_values(struct atom_value *val)
 509 {
 510         int i;
 511         for (i = 0; i < used_atom_cnt; i++) {
 512                 struct atom_value *v = &val[i];
 513                 if (v->s == NULL)
 514                         v->s = "";
 515         }
 516 }
 517
 518 /*
 519  * val is a list of atom_value to hold returned values.  Extract
 520  * the values for atoms in used_atom array out of (obj, buf, sz).
 521  * when deref is false, (obj, buf, sz) is the object that is
 522  * pointed at by the ref itself; otherwise it is the object the
 523  * ref (which is a tag) refers to.
 524  */
 525 static void grab_values(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 526 {
 527         grab_common_values(val, deref, obj, buf, sz);
 528         switch (obj->type) {
 529         case OBJ_TAG:
 530                 grab_tag_values(val, deref, obj, buf, sz);
 531                 grab_sub_body_contents(val, deref, obj, buf, sz);
 532                 grab_person("tagger", val, deref, obj, buf, sz);
 533                 break;
 534         case OBJ_COMMIT:
 535                 grab_commit_values(val, deref, obj, buf, sz);
 536                 grab_sub_body_contents(val, deref, obj, buf, sz);
 537                 grab_person("author", val, deref, obj, buf, sz);
 538                 grab_person("committer", val, deref, obj, buf, sz);
 539                 break;
 540         case OBJ_TREE:
 541                 // grab_tree_values(val, deref, obj, buf, sz);
 542                 break;
 543         case OBJ_BLOB:
 544                 // grab_blob_values(val, deref, obj, buf, sz);
 545                 break;
 546         default:
 547                 die("Eh?  Object of type %d?", obj->type);
 548         }
 549 }
 550
 551 /*
 552  * Parse the object referred by ref, and grab needed value.
 553  */
 554 static void populate_value(struct refinfo *ref)
 555 {
 556         void *buf;
 557         struct object *obj;
 558         int eaten, i;
 559         unsigned long size;
 560         const unsigned char *tagged;
 561
 562         ref->value = xcalloc(sizeof(struct atom_value), used_atom_cnt);
 563
 564         buf = get_obj(ref->objectname, &obj, &size, &eaten);
 565         if (!buf)
 566                 die("missing object %s for %s",
 567                     sha1_to_hex(ref->objectname), ref->refname);
 568         if (!obj)
 569                 die("parse_object_buffer failed on %s for %s",
 570                     sha1_to_hex(ref->objectname), ref->refname);
 571
 572         /* Fill in specials first */
 573         for (i = 0; i < used_atom_cnt; i++) {
 574                 const char *name = used_atom[i];
 575                 struct atom_value *v = &ref->value[i];
 576                 int deref = 0;
 577                 const char *refname;
 578                 const char *formatp;
 579
 580                 if (*name == '*') {
 581                         deref = 1;
 582                         name++;
 583                 }
 584
 585                 if (!prefixcmp(name, "refname"))
 586                         refname = ref->refname;
 587                 else if(!prefixcmp(name, "upstream")) {
 588                         struct branch *branch;
 589                         /* only local branches may have an upstream */
 590                         if (prefixcmp(ref->refname, "refs/heads/"))
 591                                 continue;
 592                         branch = branch_get(ref->refname + 11);
 593
 594                         if (!branch || !branch->merge || !branch->merge[0] ||
 595                             !branch->merge[0]->dst)
 596                                 continue;
 597                         refname = branch->merge[0]->dst;
 598                 }
 599                 else
 600                         continue;
 601
 602                 formatp = strchr(name, ':');
 603                 /* look for "short" refname format */
 604                 if (formatp) {
 605                         formatp++;
 606                         if (!strcmp(formatp, "short"))
 607                                 refname = shorten_unambiguous_ref(refname,
 608                                                       warn_ambiguous_refs);
 609                         else
 610                                 die("unknown %.*s format %s",
 611                                     (int)(formatp - name), name, formatp);
 612                 }
 613
 614                 if (!deref)
 615                         v->s = refname;
 616                 else {
 617                         int len = strlen(refname);
 618                         char *s = xmalloc(len + 4);
 619                         sprintf(s, "%s^{}", refname);
 620                         v->s = s;
 621                 }
 622         }
 623
 624         grab_values(ref->value, 0, obj, buf, size);
 625         if (!eaten)
 626                 free(buf);
 627
 628         /* If there is no atom that wants to know about tagged
 629          * object, we are done.
 630          */
 631         if (!need_tagged || (obj->type != OBJ_TAG))
 632                 return;
 633
 634         /* If it is a tag object, see if we use a value that derefs
 635          * the object, and if we do grab the object it refers to.
 636          */
 637         tagged = ((struct tag *)obj)->tagged->sha1;
 638
 639         /* NEEDSWORK: This derefs tag only once, which
 640          * is good to deal with chains of trust, but
 641          * is not consistent with what deref_tag() does
 642          * which peels the onion to the core.
 643          */
 644         buf = get_obj(tagged, &obj, &size, &eaten);
 645         if (!buf)
 646                 die("missing object %s for %s",
 647                     sha1_to_hex(tagged), ref->refname);
 648         if (!obj)
 649                 die("parse_object_buffer failed on %s for %s",
 650                     sha1_to_hex(tagged), ref->refname);
 651         grab_values(ref->value, 1, obj, buf, size);
 652         if (!eaten)
 653                 free(buf);
 654 }
 655
 656 /*
 657  * Given a ref, return the value for the atom.  This lazily gets value
 658  * out of the object by calling populate value.
 659  */
 660 static void get_value(struct refinfo *ref, int atom, struct atom_value **v)
 661 {
 662         if (!ref->value) {
 663                 populate_value(ref);
 664                 fill_missing_values(ref->value);
 665         }
 666         *v = &ref->value[atom];
 667 }
 668
 669 struct grab_ref_cbdata {
 670         struct refinfo **grab_array;
 671         const char **grab_pattern;
 672         int grab_cnt;
 673 };
 674
 675 /*
 676  * A call-back given to for_each_ref().  It is unfortunate that we
 677  * need to use global variables to pass extra information to this
 678  * function.
 679  */
 680 static int grab_single_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 681 {
 682         struct grab_ref_cbdata *cb = cb_data;
 683         struct refinfo *ref;
 684         int cnt;
 685
 686         if (*cb->grab_pattern) {
 687                 const char **pattern;
 688                 int namelen = strlen(refname);
 689                 for (pattern = cb->grab_pattern; *pattern; pattern++) {
 690                         const char *p = *pattern;
 691                         int plen = strlen(p);
 692
 693                         if ((plen <= namelen) &&
 694                             !strncmp(refname, p, plen) &&
 695                             (refname[plen] == '\0' ||
 696                              refname[plen] == '/' ||
 697                              p[plen-1] == '/'))
 698                                 break;
 699                         if (!fnmatch(p, refname, FNM_PATHNAME))
 700                                 break;
 701                 }
 702                 if (!*pattern)
 703                         return 0;
 704         }
 705
 706         /* We do not open the object yet; sort may only need refname
 707          * to do its job and the resulting list may yet to be pruned
 708          * by maxcount logic.
 709          */
 710         ref = xcalloc(1, sizeof(*ref));
 711         ref->refname = xstrdup(refname);
 712         hashcpy(ref->objectname, sha1);
 713
 714         cnt = cb->grab_cnt;
 715         cb->grab_array = xrealloc(cb->grab_array,
 716                                   sizeof(*cb->grab_array) * (cnt + 1));
 717         cb->grab_array[cnt++] = ref;
 718         cb->grab_cnt = cnt;
 719         return 0;
 720 }
 721
 722 static int cmp_ref_sort(struct ref_sort *s, struct refinfo *a, struct refinfo *b)
 723 {
 724         struct atom_value *va, *vb;
 725         int cmp;
 726         cmp_type cmp_type = used_atom_type[s->atom];
 727
 728         get_value(a, s->atom, &va);
 729         get_value(b, s->atom, &vb);
 730         switch (cmp_type) {
 731         case FIELD_STR:
 732                 cmp = strcmp(va->s, vb->s);
 733                 break;
 734         default:
 735                 if (va->ul < vb->ul)
 736                         cmp = -1;
 737                 else if (va->ul == vb->ul)
 738                         cmp = 0;
 739                 else
 740                         cmp = 1;
 741                 break;
 742         }
 743         return (s->reverse) ? -cmp : cmp;
 744 }
 745
 746 static struct ref_sort *ref_sort;
 747 static int compare_refs(const void *a_, const void *b_)
 748 {
 749         struct refinfo *a = *((struct refinfo **)a_);
 750         struct refinfo *b = *((struct refinfo **)b_);
 751         struct ref_sort *s;
 752
 753         for (s = ref_sort; s; s = s->next) {
 754                 int cmp = cmp_ref_sort(s, a, b);
 755                 if (cmp)
 756                         return cmp;
 757         }
 758         return 0;
 759 }
 760
 761 static void sort_refs(struct ref_sort *sort, struct refinfo **refs, int num_refs)
 762 {
 763         ref_sort = sort;
 764         qsort(refs, num_refs, sizeof(struct refinfo *), compare_refs);
 765 }
 766
 767 static void print_value(struct refinfo *ref, int atom, int quote_style)
 768 {
 769         struct atom_value *v;
 770         get_value(ref, atom, &v);
 771         switch (quote_style) {
 772         case QUOTE_NONE:
 773                 fputs(v->s, stdout);
 774                 break;
 775         case QUOTE_SHELL:
 776                 sq_quote_print(stdout, v->s);
 777                 break;
 778         case QUOTE_PERL:
 779                 perl_quote_print(stdout, v->s);
 780                 break;
 781         case QUOTE_PYTHON:
 782                 python_quote_print(stdout, v->s);
 783                 break;
 784         case QUOTE_TCL:
 785                 tcl_quote_print(stdout, v->s);
 786                 break;
 787         }
 788 }
 789
 790 static int hex1(char ch)
 791 {
 792         if ('0' <= ch && ch <= '9')
 793                 return ch - '0';
 794         else if ('a' <= ch && ch <= 'f')
 795                 return ch - 'a' + 10;
 796         else if ('A' <= ch && ch <= 'F')
 797                 return ch - 'A' + 10;
 798         return -1;
 799 }
 800 static int hex2(const char *cp)
 801 {
 802         if (cp[0] && cp[1])
 803                 return (hex1(cp[0]) << 4) | hex1(cp[1]);
 804         else
 805                 return -1;
 806 }
 807
 808 static void emit(const char *cp, const char *ep)
 809 {
 810         while (*cp && (!ep || cp < ep)) {
 811                 if (*cp == '%') {
 812                         if (cp[1] == '%')
 813                                 cp++;
 814                         else {
 815                                 int ch = hex2(cp + 1);
 816                                 if (0 <= ch) {
 817                                         putchar(ch);
 818                                         cp += 3;
 819                                         continue;
 820                                 }
 821                         }
 822                 }
 823                 putchar(*cp);
 824                 cp++;
 825         }
 826 }
 827
 828 static void show_ref(struct refinfo *info, const char *format, int quote_style)
 829 {
 830         const char *cp, *sp, *ep;
 831
 832         for (cp = format; *cp && (sp = find_next(cp)); cp = ep + 1) {
 833                 ep = strchr(sp, ')');
 834                 if (cp < sp)
 835                         emit(cp, sp);
 836                 print_value(info, parse_atom(sp + 2, ep), quote_style);
 837         }
 838         if (*cp) {
 839                 sp = cp + strlen(cp);
 840                 emit(cp, sp);
 841         }
 842         putchar('\n');
 843 }
 844
 845 static struct ref_sort *default_sort(void)
 846 {
 847         static const char cstr_name[] = "refname";
 848
 849         struct ref_sort *sort = xcalloc(1, sizeof(*sort));
 850
 851         sort->next = NULL;
 852         sort->atom = parse_atom(cstr_name, cstr_name + strlen(cstr_name));
 853         return sort;
 854 }
 855
 856 static int opt_parse_sort(const struct option *opt, const char *arg, int unset)
 857 {
 858         struct ref_sort **sort_tail = opt->value;
 859         struct ref_sort *s;
 860         int len;
 861
 862         if (!arg) /* should --no-sort void the list ? */
 863                 return -1;
 864
 865         *sort_tail = s = xcalloc(1, sizeof(*s));
 866
 867         if (*arg == '-') {
 868                 s->reverse = 1;
 869                 arg++;
 870         }
 871         len = strlen(arg);
 872         s->atom = parse_atom(arg, arg+len);
 873         return 0;
 874 }
 875
 876 static char const * const for_each_ref_usage[] = {
 877         "git for-each-ref [options] [<pattern>]",
 878         NULL
 879 };
 880
 881 int cmd_for_each_ref(int argc, const char **argv, const char *prefix)
 882 {
 883         int i, num_refs;
 884         const char *format = "%(objectname) %(objecttype)\t%(refname)";
 885         struct ref_sort *sort = NULL, **sort_tail = &sort;
 886         int maxcount = 0, quote_style = 0;
 887         struct refinfo **refs;
 888         struct grab_ref_cbdata cbdata;
 889
 890         struct option opts[] = {
 891                 OPT_BIT('s', "shell", &quote_style,
 892                         "quote placeholders suitably for shells", QUOTE_SHELL),
 893                 OPT_BIT('p', "perl",  &quote_style,
 894                         "quote placeholders suitably for perl", QUOTE_PERL),
 895                 OPT_BIT(0 , "python", &quote_style,
 896                         "quote placeholders suitably for python", QUOTE_PYTHON),
 897                 OPT_BIT(0 , "tcl",  &quote_style,
 898                         "quote placeholders suitably for tcl", QUOTE_TCL),
 899
 900                 OPT_GROUP(""),
 901                 OPT_INTEGER( 0 , "count", &maxcount, "show only <n> matched refs"),
 902                 OPT_STRING(  0 , "format", &format, "format", "format to use for the output"),
 903                 OPT_CALLBACK(0 , "sort", sort_tail, "key",
 904                             "field name to sort on", &opt_parse_sort),
 905                 OPT_END(),
 906         };
 907
 908         parse_options(argc, argv, opts, for_each_ref_usage, 0);
 909         if (maxcount < 0) {
 910                 error("invalid --count argument: `%d'", maxcount);
 911                 usage_with_options(for_each_ref_usage, opts);
 912         }
 913         if (HAS_MULTI_BITS(quote_style)) {
 914                 error("more than one quoting style?");
 915                 usage_with_options(for_each_ref_usage, opts);
 916         }
 917         if (verify_format(format))
 918                 usage_with_options(for_each_ref_usage, opts);
 919
 920         if (!sort)
 921                 sort = default_sort();
 922         sort_atom_limit = used_atom_cnt;
 923
 924         /* for warn_ambiguous_refs */
 925         git_config(git_default_config, NULL);
 926
 927         memset(&cbdata, 0, sizeof(cbdata));
 928         cbdata.grab_pattern = argv;
 929         for_each_ref(grab_single_ref, &cbdata);
 930         refs = cbdata.grab_array;
 931         num_refs = cbdata.grab_cnt;
 932
 933         for (i = 0; i < used_atom_cnt; i++) {
 934                 if (used_atom[i][0] == '*') {
 935                         need_tagged = 1;
 936                         break;
 937                 }
 938         }
 939
 940         sort_refs(sort, refs, num_refs);
 941
 942         if (!maxcount || num_refs < maxcount)
 943                 maxcount = num_refs;
 944         for (i = 0; i < maxcount; i++)
 945                 show_ref(refs[i], format, quote_style);
 946         return 0;
 947 }