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