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