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 = strchr(email, '>');
 343         if (!email || !eoemail)
 344                 return "";
 345         return xmemdupz(email, eoemail + 1 - email);
 346 }
 347
 348 static void grab_date(const char *buf, struct atom_value *v, const char *atomname)
 349 {
 350         const char *eoemail = strstr(buf, "> ");
 351         char *zone;
 352         unsigned long timestamp;
 353         long tz;
 354         enum date_mode date_mode = DATE_NORMAL;
 355         const char *formatp;
 356
 357         /*
 358          * We got here because atomname ends in "date" or "date<something>";
 359          * it's not possible that <something> is not ":<format>" because
 360          * parse_atom() wouldn't have allowed it, so we can assume that no
 361          * ":" means no format is specified, and use the default.
 362          */
 363         formatp = strchr(atomname, ':');
 364         if (formatp != NULL) {
 365                 formatp++;
 366                 date_mode = parse_date_format(formatp);
 367         }
 368
 369         if (!eoemail)
 370                 goto bad;
 371         timestamp = strtoul(eoemail + 2, &zone, 10);
 372         if (timestamp == ULONG_MAX)
 373                 goto bad;
 374         tz = strtol(zone, NULL, 10);
 375         if ((tz == LONG_MIN || tz == LONG_MAX) && errno == ERANGE)
 376                 goto bad;
 377         v->s = xstrdup(show_date(timestamp, tz, date_mode));
 378         v->ul = timestamp;
 379         return;
 380  bad:
 381         v->s = "";
 382         v->ul = 0;
 383 }
 384
 385 /* See grab_values */
 386 static void grab_person(const char *who, struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 387 {
 388         int i;
 389         int wholen = strlen(who);
 390         const char *wholine = NULL;
 391
 392         for (i = 0; i < used_atom_cnt; i++) {
 393                 const char *name = used_atom[i];
 394                 struct atom_value *v = &val[i];
 395                 if (!!deref != (*name == '*'))
 396                         continue;
 397                 if (deref)
 398                         name++;
 399                 if (strncmp(who, name, wholen))
 400                         continue;
 401                 if (name[wholen] != 0 &&
 402                     strcmp(name + wholen, "name") &&
 403                     strcmp(name + wholen, "email") &&
 404                     prefixcmp(name + wholen, "date"))
 405                         continue;
 406                 if (!wholine)
 407                         wholine = find_wholine(who, wholen, buf, sz);
 408                 if (!wholine)
 409                         return; /* no point looking for it */
 410                 if (name[wholen] == 0)
 411                         v->s = copy_line(wholine);
 412                 else if (!strcmp(name + wholen, "name"))
 413                         v->s = copy_name(wholine);
 414                 else if (!strcmp(name + wholen, "email"))
 415                         v->s = copy_email(wholine);
 416                 else if (!prefixcmp(name + wholen, "date"))
 417                         grab_date(wholine, v, name);
 418         }
 419
 420         /* For a tag or a commit object, if "creator" or "creatordate" is
 421          * requested, do something special.
 422          */
 423         if (strcmp(who, "tagger") && strcmp(who, "committer"))
 424                 return; /* "author" for commit object is not wanted */
 425         if (!wholine)
 426                 wholine = find_wholine(who, wholen, buf, sz);
 427         if (!wholine)
 428                 return;
 429         for (i = 0; i < used_atom_cnt; i++) {
 430                 const char *name = used_atom[i];
 431                 struct atom_value *v = &val[i];
 432                 if (!!deref != (*name == '*'))
 433                         continue;
 434                 if (deref)
 435                         name++;
 436
 437                 if (!prefixcmp(name, "creatordate"))
 438                         grab_date(wholine, v, name);
 439                 else if (!strcmp(name, "creator"))
 440                         v->s = copy_line(wholine);
 441         }
 442 }
 443
 444 static void find_subpos(const char *buf, unsigned long sz, const char **sub, const char **body)
 445 {
 446         while (*buf) {
 447                 const char *eol = strchr(buf, '\n');
 448                 if (!eol)
 449                         return;
 450                 if (eol[1] == '\n') {
 451                         buf = eol + 1;
 452                         break; /* found end of header */
 453                 }
 454                 buf = eol + 1;
 455         }
 456         while (*buf == '\n')
 457                 buf++;
 458         if (!*buf)
 459                 return;
 460         *sub = buf; /* first non-empty line */
 461         buf = strchr(buf, '\n');
 462         if (!buf) {
 463                 *body = "";
 464                 return; /* no body */
 465         }
 466         while (*buf == '\n')
 467                 buf++; /* skip blank between subject and body */
 468         *body = buf;
 469 }
 470
 471 /* See grab_values */
 472 static void grab_sub_body_contents(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 473 {
 474         int i;
 475         const char *subpos = NULL, *bodypos = NULL;
 476
 477         for (i = 0; i < used_atom_cnt; i++) {
 478                 const char *name = used_atom[i];
 479                 struct atom_value *v = &val[i];
 480                 if (!!deref != (*name == '*'))
 481                         continue;
 482                 if (deref)
 483                         name++;
 484                 if (strcmp(name, "subject") &&
 485                     strcmp(name, "body") &&
 486                     strcmp(name, "contents"))
 487                         continue;
 488                 if (!subpos)
 489                         find_subpos(buf, sz, &subpos, &bodypos);
 490                 if (!subpos)
 491                         return;
 492
 493                 if (!strcmp(name, "subject"))
 494                         v->s = copy_line(subpos);
 495                 else if (!strcmp(name, "body"))
 496                         v->s = xstrdup(bodypos);
 497                 else if (!strcmp(name, "contents"))
 498                         v->s = xstrdup(subpos);
 499         }
 500 }
 501
 502 /* We want to have empty print-string for field requests
 503  * that do not apply (e.g. "authordate" for a tag object)
 504  */
 505 static void fill_missing_values(struct atom_value *val)
 506 {
 507         int i;
 508         for (i = 0; i < used_atom_cnt; i++) {
 509                 struct atom_value *v = &val[i];
 510                 if (v->s == NULL)
 511                         v->s = "";
 512         }
 513 }
 514
 515 /*
 516  * val is a list of atom_value to hold returned values.  Extract
 517  * the values for atoms in used_atom array out of (obj, buf, sz).
 518  * when deref is false, (obj, buf, sz) is the object that is
 519  * pointed at by the ref itself; otherwise it is the object the
 520  * ref (which is a tag) refers to.
 521  */
 522 static void grab_values(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 523 {
 524         grab_common_values(val, deref, obj, buf, sz);
 525         switch (obj->type) {
 526         case OBJ_TAG:
 527                 grab_tag_values(val, deref, obj, buf, sz);
 528                 grab_sub_body_contents(val, deref, obj, buf, sz);
 529                 grab_person("tagger", val, deref, obj, buf, sz);
 530                 break;
 531         case OBJ_COMMIT:
 532                 grab_commit_values(val, deref, obj, buf, sz);
 533                 grab_sub_body_contents(val, deref, obj, buf, sz);
 534                 grab_person("author", val, deref, obj, buf, sz);
 535                 grab_person("committer", val, deref, obj, buf, sz);
 536                 break;
 537         case OBJ_TREE:
 538                 // grab_tree_values(val, deref, obj, buf, sz);
 539                 break;
 540         case OBJ_BLOB:
 541                 // grab_blob_values(val, deref, obj, buf, sz);
 542                 break;
 543         default:
 544                 die("Eh?  Object of type %d?", obj->type);
 545         }
 546 }
 547
 548 /*
 549  * Parse the object referred by ref, and grab needed value.
 550  */
 551 static void populate_value(struct refinfo *ref)
 552 {
 553         void *buf;
 554         struct object *obj;
 555         int eaten, i;
 556         unsigned long size;
 557         const unsigned char *tagged;
 558
 559         ref->value = xcalloc(sizeof(struct atom_value), used_atom_cnt);
 560
 561         buf = get_obj(ref->objectname, &obj, &size, &eaten);
 562         if (!buf)
 563                 die("missing object %s for %s",
 564                     sha1_to_hex(ref->objectname), ref->refname);
 565         if (!obj)
 566                 die("parse_object_buffer failed on %s for %s",
 567                     sha1_to_hex(ref->objectname), ref->refname);
 568
 569         /* Fill in specials first */
 570         for (i = 0; i < used_atom_cnt; i++) {
 571                 const char *name = used_atom[i];
 572                 struct atom_value *v = &ref->value[i];
 573                 int deref = 0;
 574                 const char *refname;
 575                 const char *formatp;
 576
 577                 if (*name == '*') {
 578                         deref = 1;
 579                         name++;
 580                 }
 581
 582                 if (!prefixcmp(name, "refname"))
 583                         refname = ref->refname;
 584                 else if(!prefixcmp(name, "upstream")) {
 585                         struct branch *branch;
 586                         /* only local branches may have an upstream */
 587                         if (prefixcmp(ref->refname, "refs/heads/"))
 588                                 continue;
 589                         branch = branch_get(ref->refname + 11);
 590
 591                         if (!branch || !branch->merge || !branch->merge[0] ||
 592                             !branch->merge[0]->dst)
 593                                 continue;
 594                         refname = branch->merge[0]->dst;
 595                 }
 596                 else
 597                         continue;
 598
 599                 formatp = strchr(name, ':');
 600                 /* look for "short" refname format */
 601                 if (formatp) {
 602                         formatp++;
 603                         if (!strcmp(formatp, "short"))
 604                                 refname = shorten_unambiguous_ref(refname);
 605                         else
 606                                 die("unknown %.*s format %s",
 607                                     (int)(formatp - name), name, formatp);
 608                 }
 609
 610                 if (!deref)
 611                         v->s = refname;
 612                 else {
 613                         int len = strlen(refname);
 614                         char *s = xmalloc(len + 4);
 615                         sprintf(s, "%s^{}", refname);
 616                         v->s = s;
 617                 }
 618         }
 619
 620         grab_values(ref->value, 0, obj, buf, size);
 621         if (!eaten)
 622                 free(buf);
 623
 624         /* If there is no atom that wants to know about tagged
 625          * object, we are done.
 626          */
 627         if (!need_tagged || (obj->type != OBJ_TAG))
 628                 return;
 629
 630         /* If it is a tag object, see if we use a value that derefs
 631          * the object, and if we do grab the object it refers to.
 632          */
 633         tagged = ((struct tag *)obj)->tagged->sha1;
 634
 635         /* NEEDSWORK: This derefs tag only once, which
 636          * is good to deal with chains of trust, but
 637          * is not consistent with what deref_tag() does
 638          * which peels the onion to the core.
 639          */
 640         buf = get_obj(tagged, &obj, &size, &eaten);
 641         if (!buf)
 642                 die("missing object %s for %s",
 643                     sha1_to_hex(tagged), ref->refname);
 644         if (!obj)
 645                 die("parse_object_buffer failed on %s for %s",
 646                     sha1_to_hex(tagged), ref->refname);
 647         grab_values(ref->value, 1, obj, buf, size);
 648         if (!eaten)
 649                 free(buf);
 650 }
 651
 652 /*
 653  * Given a ref, return the value for the atom.  This lazily gets value
 654  * out of the object by calling populate value.
 655  */
 656 static void get_value(struct refinfo *ref, int atom, struct atom_value **v)
 657 {
 658         if (!ref->value) {
 659                 populate_value(ref);
 660                 fill_missing_values(ref->value);
 661         }
 662         *v = &ref->value[atom];
 663 }
 664
 665 struct grab_ref_cbdata {
 666         struct refinfo **grab_array;
 667         const char **grab_pattern;
 668         int grab_cnt;
 669 };
 670
 671 /*
 672  * A call-back given to for_each_ref().  It is unfortunate that we
 673  * need to use global variables to pass extra information to this
 674  * function.
 675  */
 676 static int grab_single_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 677 {
 678         struct grab_ref_cbdata *cb = cb_data;
 679         struct refinfo *ref;
 680         int cnt;
 681
 682         if (*cb->grab_pattern) {
 683                 const char **pattern;
 684                 int namelen = strlen(refname);
 685                 for (pattern = cb->grab_pattern; *pattern; pattern++) {
 686                         const char *p = *pattern;
 687                         int plen = strlen(p);
 688
 689                         if ((plen <= namelen) &&
 690                             !strncmp(refname, p, plen) &&
 691                             (refname[plen] == '\0' ||
 692                              refname[plen] == '/' ||
 693                              p[plen-1] == '/'))
 694                                 break;
 695                         if (!fnmatch(p, refname, FNM_PATHNAME))
 696                                 break;
 697                 }
 698                 if (!*pattern)
 699                         return 0;
 700         }
 701
 702         /* We do not open the object yet; sort may only need refname
 703          * to do its job and the resulting list may yet to be pruned
 704          * by maxcount logic.
 705          */
 706         ref = xcalloc(1, sizeof(*ref));
 707         ref->refname = xstrdup(refname);
 708         hashcpy(ref->objectname, sha1);
 709
 710         cnt = cb->grab_cnt;
 711         cb->grab_array = xrealloc(cb->grab_array,
 712                                   sizeof(*cb->grab_array) * (cnt + 1));
 713         cb->grab_array[cnt++] = ref;
 714         cb->grab_cnt = cnt;
 715         return 0;
 716 }
 717
 718 static int cmp_ref_sort(struct ref_sort *s, struct refinfo *a, struct refinfo *b)
 719 {
 720         struct atom_value *va, *vb;
 721         int cmp;
 722         cmp_type cmp_type = used_atom_type[s->atom];
 723
 724         get_value(a, s->atom, &va);
 725         get_value(b, s->atom, &vb);
 726         switch (cmp_type) {
 727         case FIELD_STR:
 728                 cmp = strcmp(va->s, vb->s);
 729                 break;
 730         default:
 731                 if (va->ul < vb->ul)
 732                         cmp = -1;
 733                 else if (va->ul == vb->ul)
 734                         cmp = 0;
 735                 else
 736                         cmp = 1;
 737                 break;
 738         }
 739         return (s->reverse) ? -cmp : cmp;
 740 }
 741
 742 static struct ref_sort *ref_sort;
 743 static int compare_refs(const void *a_, const void *b_)
 744 {
 745         struct refinfo *a = *((struct refinfo **)a_);
 746         struct refinfo *b = *((struct refinfo **)b_);
 747         struct ref_sort *s;
 748
 749         for (s = ref_sort; s; s = s->next) {
 750                 int cmp = cmp_ref_sort(s, a, b);
 751                 if (cmp)
 752                         return cmp;
 753         }
 754         return 0;
 755 }
 756
 757 static void sort_refs(struct ref_sort *sort, struct refinfo **refs, int num_refs)
 758 {
 759         ref_sort = sort;
 760         qsort(refs, num_refs, sizeof(struct refinfo *), compare_refs);
 761 }
 762
 763 static void print_value(struct refinfo *ref, int atom, int quote_style)
 764 {
 765         struct atom_value *v;
 766         get_value(ref, atom, &v);
 767         switch (quote_style) {
 768         case QUOTE_NONE:
 769                 fputs(v->s, stdout);
 770                 break;
 771         case QUOTE_SHELL:
 772                 sq_quote_print(stdout, v->s);
 773                 break;
 774         case QUOTE_PERL:
 775                 perl_quote_print(stdout, v->s);
 776                 break;
 777         case QUOTE_PYTHON:
 778                 python_quote_print(stdout, v->s);
 779                 break;
 780         case QUOTE_TCL:
 781                 tcl_quote_print(stdout, v->s);
 782                 break;
 783         }
 784 }
 785
 786 static int hex1(char ch)
 787 {
 788         if ('0' <= ch && ch <= '9')
 789                 return ch - '0';
 790         else if ('a' <= ch && ch <= 'f')
 791                 return ch - 'a' + 10;
 792         else if ('A' <= ch && ch <= 'F')
 793                 return ch - 'A' + 10;
 794         return -1;
 795 }
 796 static int hex2(const char *cp)
 797 {
 798         if (cp[0] && cp[1])
 799                 return (hex1(cp[0]) << 4) | hex1(cp[1]);
 800         else
 801                 return -1;
 802 }
 803
 804 static void emit(const char *cp, const char *ep)
 805 {
 806         while (*cp && (!ep || cp < ep)) {
 807                 if (*cp == '%') {
 808                         if (cp[1] == '%')
 809                                 cp++;
 810                         else {
 811                                 int ch = hex2(cp + 1);
 812                                 if (0 <= ch) {
 813                                         putchar(ch);
 814                                         cp += 3;
 815                                         continue;
 816                                 }
 817                         }
 818                 }
 819                 putchar(*cp);
 820                 cp++;
 821         }
 822 }
 823
 824 static void show_ref(struct refinfo *info, const char *format, int quote_style)
 825 {
 826         const char *cp, *sp, *ep;
 827
 828         for (cp = format; *cp && (sp = find_next(cp)); cp = ep + 1) {
 829                 ep = strchr(sp, ')');
 830                 if (cp < sp)
 831                         emit(cp, sp);
 832                 print_value(info, parse_atom(sp + 2, ep), quote_style);
 833         }
 834         if (*cp) {
 835                 sp = cp + strlen(cp);
 836                 emit(cp, sp);
 837         }
 838         putchar('\n');
 839 }
 840
 841 static struct ref_sort *default_sort(void)
 842 {
 843         static const char cstr_name[] = "refname";
 844
 845         struct ref_sort *sort = xcalloc(1, sizeof(*sort));
 846
 847         sort->next = NULL;
 848         sort->atom = parse_atom(cstr_name, cstr_name + strlen(cstr_name));
 849         return sort;
 850 }
 851
 852 static int opt_parse_sort(const struct option *opt, const char *arg, int unset)
 853 {
 854         struct ref_sort **sort_tail = opt->value;
 855         struct ref_sort *s;
 856         int len;
 857
 858         if (!arg) /* should --no-sort void the list ? */
 859                 return -1;
 860
 861         *sort_tail = s = xcalloc(1, sizeof(*s));
 862
 863         if (*arg == '-') {
 864                 s->reverse = 1;
 865                 arg++;
 866         }
 867         len = strlen(arg);
 868         s->atom = parse_atom(arg, arg+len);
 869         return 0;
 870 }
 871
 872 static char const * const for_each_ref_usage[] = {
 873         "git for-each-ref [options] [<pattern>]",
 874         NULL
 875 };
 876
 877 int cmd_for_each_ref(int argc, const char **argv, const char *prefix)
 878 {
 879         int i, num_refs;
 880         const char *format = "%(objectname) %(objecttype)\t%(refname)";
 881         struct ref_sort *sort = NULL, **sort_tail = &sort;
 882         int maxcount = 0, quote_style = 0;
 883         struct refinfo **refs;
 884         struct grab_ref_cbdata cbdata;
 885
 886         struct option opts[] = {
 887                 OPT_BIT('s', "shell", &quote_style,
 888                         "quote placeholders suitably for shells", QUOTE_SHELL),
 889                 OPT_BIT('p', "perl",  &quote_style,
 890                         "quote placeholders suitably for perl", QUOTE_PERL),
 891                 OPT_BIT(0 , "python", &quote_style,
 892                         "quote placeholders suitably for python", QUOTE_PYTHON),
 893                 OPT_BIT(0 , "tcl",  &quote_style,
 894                         "quote placeholders suitably for tcl", QUOTE_TCL),
 895
 896                 OPT_GROUP(""),
 897                 OPT_INTEGER( 0 , "count", &maxcount, "show only <n> matched refs"),
 898                 OPT_STRING(  0 , "format", &format, "format", "format to use for the output"),
 899                 OPT_CALLBACK(0 , "sort", sort_tail, "key",
 900                             "field name to sort on", &opt_parse_sort),
 901                 OPT_END(),
 902         };
 903
 904         parse_options(argc, argv, opts, for_each_ref_usage, 0);
 905         if (maxcount < 0) {
 906                 error("invalid --count argument: `%d'", maxcount);
 907                 usage_with_options(for_each_ref_usage, opts);
 908         }
 909         if (HAS_MULTI_BITS(quote_style)) {
 910                 error("more than one quoting style?");
 911                 usage_with_options(for_each_ref_usage, opts);
 912         }
 913         if (verify_format(format))
 914                 usage_with_options(for_each_ref_usage, opts);
 915
 916         if (!sort)
 917                 sort = default_sort();
 918         sort_atom_limit = used_atom_cnt;
 919
 920         memset(&cbdata, 0, sizeof(cbdata));
 921         cbdata.grab_pattern = argv;
 922         for_each_ref(grab_single_ref, &cbdata);
 923         refs = cbdata.grab_array;
 924         num_refs = cbdata.grab_cnt;
 925
 926         for (i = 0; i < used_atom_cnt; i++) {
 927                 if (used_atom[i][0] == '*') {
 928                         need_tagged = 1;
 929                         break;
 930                 }
 931         }
 932
 933         sort_refs(sort, refs, num_refs);
 934
 935         if (!maxcount || num_refs < maxcount)
 936                 maxcount = num_refs;
 937         for (i = 0; i < maxcount; i++)
 938                 show_ref(refs[i], format, quote_style);
 939         return 0;
 940 }