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         int flag;
  37         const char *symref;
  38         struct atom_value *value;
  39 };
  40
  41 static struct {
  42         const char *name;
  43         cmp_type cmp_type;
  44 } valid_atom[] = {
  45         { "refname" },
  46         { "objecttype" },
  47         { "objectsize", FIELD_ULONG },
  48         { "objectname" },
  49         { "tree" },
  50         { "parent" },
  51         { "numparent", FIELD_ULONG },
  52         { "object" },
  53         { "type" },
  54         { "tag" },
  55         { "author" },
  56         { "authorname" },
  57         { "authoremail" },
  58         { "authordate", FIELD_TIME },
  59         { "committer" },
  60         { "committername" },
  61         { "committeremail" },
  62         { "committerdate", FIELD_TIME },
  63         { "tagger" },
  64         { "taggername" },
  65         { "taggeremail" },
  66         { "taggerdate", FIELD_TIME },
  67         { "creator" },
  68         { "creatordate", FIELD_TIME },
  69         { "subject" },
  70         { "body" },
  71         { "contents" },
  72         { "upstream" },
  73         { "symref" },
  74         { "flag" },
  75 };
  76
  77 /*
  78  * An atom is a valid field atom listed above, possibly prefixed with
  79  * a "*" to denote deref_tag().
  80  *
  81  * We parse given format string and sort specifiers, and make a list
  82  * of properties that we need to extract out of objects.  refinfo
  83  * structure will hold an array of values extracted that can be
  84  * indexed with the "atom number", which is an index into this
  85  * array.
  86  */
  87 static const char **used_atom;
  88 static cmp_type *used_atom_type;
  89 static int used_atom_cnt, sort_atom_limit, need_tagged, need_symref;
  90
  91 /*
  92  * Used to parse format string and sort specifiers
  93  */
  94 static int parse_atom(const char *atom, const char *ep)
  95 {
  96         const char *sp;
  97         int i, at;
  98
  99         sp = atom;
 100         if (*sp == '*' && sp < ep)
 101                 sp++; /* deref */
 102         if (ep <= sp)
 103                 die("malformed field name: %.*s", (int)(ep-atom), atom);
 104
 105         /* Do we have the atom already used elsewhere? */
 106         for (i = 0; i < used_atom_cnt; i++) {
 107                 int len = strlen(used_atom[i]);
 108                 if (len == ep - atom && !memcmp(used_atom[i], atom, len))
 109                         return i;
 110         }
 111
 112         /* Is the atom a valid one? */
 113         for (i = 0; i < ARRAY_SIZE(valid_atom); i++) {
 114                 int len = strlen(valid_atom[i].name);
 115                 /*
 116                  * If the atom name has a colon, strip it and everything after
 117                  * it off - it specifies the format for this entry, and
 118                  * shouldn't be used for checking against the valid_atom
 119                  * table.
 120                  */
 121                 const char *formatp = strchr(sp, ':');
 122                 if (!formatp || ep < formatp)
 123                         formatp = ep;
 124                 if (len == formatp - sp && !memcmp(valid_atom[i].name, sp, len))
 125                         break;
 126         }
 127
 128         if (ARRAY_SIZE(valid_atom) <= i)
 129                 die("unknown field name: %.*s", (int)(ep-atom), atom);
 130
 131         /* Add it in, including the deref prefix */
 132         at = used_atom_cnt;
 133         used_atom_cnt++;
 134         used_atom = xrealloc(used_atom,
 135                              (sizeof *used_atom) * used_atom_cnt);
 136         used_atom_type = xrealloc(used_atom_type,
 137                                   (sizeof(*used_atom_type) * used_atom_cnt));
 138         used_atom[at] = xmemdupz(atom, ep - atom);
 139         used_atom_type[at] = valid_atom[i].cmp_type;
 140         if (*atom == '*')
 141                 need_tagged = 1;
 142         if (!strcmp(used_atom[at], "symref"))
 143                 need_symref = 1;
 144         return at;
 145 }
 146
 147 /*
 148  * In a format string, find the next occurrence of %(atom).
 149  */
 150 static const char *find_next(const char *cp)
 151 {
 152         while (*cp) {
 153                 if (*cp == '%') {
 154                         /*
 155                          * %( is the start of an atom;
 156                          * %% is a quoted per-cent.
 157                          */
 158                         if (cp[1] == '(')
 159                                 return cp;
 160                         else if (cp[1] == '%')
 161                                 cp++; /* skip over two % */
 162                         /* otherwise this is a singleton, literal % */
 163                 }
 164                 cp++;
 165         }
 166         return NULL;
 167 }
 168
 169 /*
 170  * Make sure the format string is well formed, and parse out
 171  * the used atoms.
 172  */
 173 static int verify_format(const char *format)
 174 {
 175         const char *cp, *sp;
 176         for (cp = format; *cp && (sp = find_next(cp)); ) {
 177                 const char *ep = strchr(sp, ')');
 178                 if (!ep)
 179                         return error("malformed format string %s", sp);
 180                 /* sp points at "%(" and ep points at the closing ")" */
 181                 parse_atom(sp + 2, ep);
 182                 cp = ep + 1;
 183         }
 184         return 0;
 185 }
 186
 187 /*
 188  * Given an object name, read the object data and size, and return a
 189  * "struct object".  If the object data we are returning is also borrowed
 190  * by the "struct object" representation, set *eaten as well---it is a
 191  * signal from parse_object_buffer to us not to free the buffer.
 192  */
 193 static void *get_obj(const unsigned char *sha1, struct object **obj, unsigned long *sz, int *eaten)
 194 {
 195         enum object_type type;
 196         void *buf = read_sha1_file(sha1, &type, sz);
 197
 198         if (buf)
 199                 *obj = parse_object_buffer(sha1, type, *sz, buf, eaten);
 200         else
 201                 *obj = NULL;
 202         return buf;
 203 }
 204
 205 /* See grab_values */
 206 static void grab_common_values(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 207 {
 208         int i;
 209
 210         for (i = 0; i < used_atom_cnt; i++) {
 211                 const char *name = used_atom[i];
 212                 struct atom_value *v = &val[i];
 213                 if (!!deref != (*name == '*'))
 214                         continue;
 215                 if (deref)
 216                         name++;
 217                 if (!strcmp(name, "objecttype"))
 218                         v->s = typename(obj->type);
 219                 else if (!strcmp(name, "objectsize")) {
 220                         char *s = xmalloc(40);
 221                         sprintf(s, "%lu", sz);
 222                         v->ul = sz;
 223                         v->s = s;
 224                 }
 225                 else if (!strcmp(name, "objectname")) {
 226                         char *s = xmalloc(41);
 227                         strcpy(s, sha1_to_hex(obj->sha1));
 228                         v->s = s;
 229                 }
 230         }
 231 }
 232
 233 /* See grab_values */
 234 static void grab_tag_values(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 235 {
 236         int i;
 237         struct tag *tag = (struct tag *) obj;
 238
 239         for (i = 0; i < used_atom_cnt; i++) {
 240                 const char *name = used_atom[i];
 241                 struct atom_value *v = &val[i];
 242                 if (!!deref != (*name == '*'))
 243                         continue;
 244                 if (deref)
 245                         name++;
 246                 if (!strcmp(name, "tag"))
 247                         v->s = tag->tag;
 248                 else if (!strcmp(name, "type") && tag->tagged)
 249                         v->s = typename(tag->tagged->type);
 250                 else if (!strcmp(name, "object") && tag->tagged) {
 251                         char *s = xmalloc(41);
 252                         strcpy(s, sha1_to_hex(tag->tagged->sha1));
 253                         v->s = s;
 254                 }
 255         }
 256 }
 257
 258 static int num_parents(struct commit *commit)
 259 {
 260         struct commit_list *parents;
 261         int i;
 262
 263         for (i = 0, parents = commit->parents;
 264              parents;
 265              parents = parents->next)
 266                 i++;
 267         return i;
 268 }
 269
 270 /* See grab_values */
 271 static void grab_commit_values(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 272 {
 273         int i;
 274         struct commit *commit = (struct commit *) obj;
 275
 276         for (i = 0; i < used_atom_cnt; i++) {
 277                 const char *name = used_atom[i];
 278                 struct atom_value *v = &val[i];
 279                 if (!!deref != (*name == '*'))
 280                         continue;
 281                 if (deref)
 282                         name++;
 283                 if (!strcmp(name, "tree")) {
 284                         char *s = xmalloc(41);
 285                         strcpy(s, sha1_to_hex(commit->tree->object.sha1));
 286                         v->s = s;
 287                 }
 288                 if (!strcmp(name, "numparent")) {
 289                         char *s = xmalloc(40);
 290                         v->ul = num_parents(commit);
 291                         sprintf(s, "%lu", v->ul);
 292                         v->s = s;
 293                 }
 294                 else if (!strcmp(name, "parent")) {
 295                         int num = num_parents(commit);
 296                         int i;
 297                         struct commit_list *parents;
 298                         char *s = xmalloc(41 * num + 1);
 299                         v->s = s;
 300                         for (i = 0, parents = commit->parents;
 301                              parents;
 302                              parents = parents->next, i = i + 41) {
 303                                 struct commit *parent = parents->item;
 304                                 strcpy(s+i, sha1_to_hex(parent->object.sha1));
 305                                 if (parents->next)
 306                                         s[i+40] = ' ';
 307                         }
 308                         if (!i)
 309                                 *s = '\0';
 310                 }
 311         }
 312 }
 313
 314 static const char *find_wholine(const char *who, int wholen, const char *buf, unsigned long sz)
 315 {
 316         const char *eol;
 317         while (*buf) {
 318                 if (!strncmp(buf, who, wholen) &&
 319                     buf[wholen] == ' ')
 320                         return buf + wholen + 1;
 321                 eol = strchr(buf, '\n');
 322                 if (!eol)
 323                         return "";
 324                 eol++;
 325                 if (*eol == '\n')
 326                         return ""; /* end of header */
 327                 buf = eol;
 328         }
 329         return "";
 330 }
 331
 332 static const char *copy_line(const char *buf)
 333 {
 334         const char *eol = strchrnul(buf, '\n');
 335         return xmemdupz(buf, eol - buf);
 336 }
 337
 338 static const char *copy_name(const char *buf)
 339 {
 340         const char *cp;
 341         for (cp = buf; *cp && *cp != '\n'; cp++) {
 342                 if (!strncmp(cp, " <", 2))
 343                         return xmemdupz(buf, cp - buf);
 344         }
 345         return "";
 346 }
 347
 348 static const char *copy_email(const char *buf)
 349 {
 350         const char *email = strchr(buf, '<');
 351         const char *eoemail;
 352         if (!email)
 353                 return "";
 354         eoemail = strchr(email, '>');
 355         if (!eoemail)
 356                 return "";
 357         return xmemdupz(email, eoemail + 1 - email);
 358 }
 359
 360 static void grab_date(const char *buf, struct atom_value *v, const char *atomname)
 361 {
 362         const char *eoemail = strstr(buf, "> ");
 363         char *zone;
 364         unsigned long timestamp;
 365         long tz;
 366         enum date_mode date_mode = DATE_NORMAL;
 367         const char *formatp;
 368
 369         /*
 370          * We got here because atomname ends in "date" or "date<something>";
 371          * it's not possible that <something> is not ":<format>" because
 372          * parse_atom() wouldn't have allowed it, so we can assume that no
 373          * ":" means no format is specified, and use the default.
 374          */
 375         formatp = strchr(atomname, ':');
 376         if (formatp != NULL) {
 377                 formatp++;
 378                 date_mode = parse_date_format(formatp);
 379         }
 380
 381         if (!eoemail)
 382                 goto bad;
 383         timestamp = strtoul(eoemail + 2, &zone, 10);
 384         if (timestamp == ULONG_MAX)
 385                 goto bad;
 386         tz = strtol(zone, NULL, 10);
 387         if ((tz == LONG_MIN || tz == LONG_MAX) && errno == ERANGE)
 388                 goto bad;
 389         v->s = xstrdup(show_date(timestamp, tz, date_mode));
 390         v->ul = timestamp;
 391         return;
 392  bad:
 393         v->s = "";
 394         v->ul = 0;
 395 }
 396
 397 /* See grab_values */
 398 static void grab_person(const char *who, struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 399 {
 400         int i;
 401         int wholen = strlen(who);
 402         const char *wholine = NULL;
 403
 404         for (i = 0; i < used_atom_cnt; i++) {
 405                 const char *name = used_atom[i];
 406                 struct atom_value *v = &val[i];
 407                 if (!!deref != (*name == '*'))
 408                         continue;
 409                 if (deref)
 410                         name++;
 411                 if (strncmp(who, name, wholen))
 412                         continue;
 413                 if (name[wholen] != 0 &&
 414                     strcmp(name + wholen, "name") &&
 415                     strcmp(name + wholen, "email") &&
 416                     prefixcmp(name + wholen, "date"))
 417                         continue;
 418                 if (!wholine)
 419                         wholine = find_wholine(who, wholen, buf, sz);
 420                 if (!wholine)
 421                         return; /* no point looking for it */
 422                 if (name[wholen] == 0)
 423                         v->s = copy_line(wholine);
 424                 else if (!strcmp(name + wholen, "name"))
 425                         v->s = copy_name(wholine);
 426                 else if (!strcmp(name + wholen, "email"))
 427                         v->s = copy_email(wholine);
 428                 else if (!prefixcmp(name + wholen, "date"))
 429                         grab_date(wholine, v, name);
 430         }
 431
 432         /*
 433          * For a tag or a commit object, if "creator" or "creatordate" is
 434          * requested, do something special.
 435          */
 436         if (strcmp(who, "tagger") && strcmp(who, "committer"))
 437                 return; /* "author" for commit object is not wanted */
 438         if (!wholine)
 439                 wholine = find_wholine(who, wholen, buf, sz);
 440         if (!wholine)
 441                 return;
 442         for (i = 0; i < used_atom_cnt; i++) {
 443                 const char *name = used_atom[i];
 444                 struct atom_value *v = &val[i];
 445                 if (!!deref != (*name == '*'))
 446                         continue;
 447                 if (deref)
 448                         name++;
 449
 450                 if (!prefixcmp(name, "creatordate"))
 451                         grab_date(wholine, v, name);
 452                 else if (!strcmp(name, "creator"))
 453                         v->s = copy_line(wholine);
 454         }
 455 }
 456
 457 static void find_subpos(const char *buf, unsigned long sz, const char **sub, const char **body)
 458 {
 459         while (*buf) {
 460                 const char *eol = strchr(buf, '\n');
 461                 if (!eol)
 462                         return;
 463                 if (eol[1] == '\n') {
 464                         buf = eol + 1;
 465                         break; /* found end of header */
 466                 }
 467                 buf = eol + 1;
 468         }
 469         while (*buf == '\n')
 470                 buf++;
 471         if (!*buf)
 472                 return;
 473         *sub = buf; /* first non-empty line */
 474         buf = strchr(buf, '\n');
 475         if (!buf) {
 476                 *body = "";
 477                 return; /* no body */
 478         }
 479         while (*buf == '\n')
 480                 buf++; /* skip blank between subject and body */
 481         *body = buf;
 482 }
 483
 484 /* See grab_values */
 485 static void grab_sub_body_contents(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 486 {
 487         int i;
 488         const char *subpos = NULL, *bodypos = NULL;
 489
 490         for (i = 0; i < used_atom_cnt; i++) {
 491                 const char *name = used_atom[i];
 492                 struct atom_value *v = &val[i];
 493                 if (!!deref != (*name == '*'))
 494                         continue;
 495                 if (deref)
 496                         name++;
 497                 if (strcmp(name, "subject") &&
 498                     strcmp(name, "body") &&
 499                     strcmp(name, "contents"))
 500                         continue;
 501                 if (!subpos)
 502                         find_subpos(buf, sz, &subpos, &bodypos);
 503                 if (!subpos)
 504                         return;
 505
 506                 if (!strcmp(name, "subject"))
 507                         v->s = copy_line(subpos);
 508                 else if (!strcmp(name, "body"))
 509                         v->s = xstrdup(bodypos);
 510                 else if (!strcmp(name, "contents"))
 511                         v->s = xstrdup(subpos);
 512         }
 513 }
 514
 515 /*
 516  * We want to have empty print-string for field requests
 517  * that do not apply (e.g. "authordate" for a tag object)
 518  */
 519 static void fill_missing_values(struct atom_value *val)
 520 {
 521         int i;
 522         for (i = 0; i < used_atom_cnt; i++) {
 523                 struct atom_value *v = &val[i];
 524                 if (v->s == NULL)
 525                         v->s = "";
 526         }
 527 }
 528
 529 /*
 530  * val is a list of atom_value to hold returned values.  Extract
 531  * the values for atoms in used_atom array out of (obj, buf, sz).
 532  * when deref is false, (obj, buf, sz) is the object that is
 533  * pointed at by the ref itself; otherwise it is the object the
 534  * ref (which is a tag) refers to.
 535  */
 536 static void grab_values(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 537 {
 538         grab_common_values(val, deref, obj, buf, sz);
 539         switch (obj->type) {
 540         case OBJ_TAG:
 541                 grab_tag_values(val, deref, obj, buf, sz);
 542                 grab_sub_body_contents(val, deref, obj, buf, sz);
 543                 grab_person("tagger", val, deref, obj, buf, sz);
 544                 break;
 545         case OBJ_COMMIT:
 546                 grab_commit_values(val, deref, obj, buf, sz);
 547                 grab_sub_body_contents(val, deref, obj, buf, sz);
 548                 grab_person("author", val, deref, obj, buf, sz);
 549                 grab_person("committer", val, deref, obj, buf, sz);
 550                 break;
 551         case OBJ_TREE:
 552                 /* grab_tree_values(val, deref, obj, buf, sz); */
 553                 break;
 554         case OBJ_BLOB:
 555                 /* grab_blob_values(val, deref, obj, buf, sz); */
 556                 break;
 557         default:
 558                 die("Eh?  Object of type %d?", obj->type);
 559         }
 560 }
 561
 562 static inline char *copy_advance(char *dst, const char *src)
 563 {
 564         while (*src)
 565                 *dst++ = *src++;
 566         return dst;
 567 }
 568
 569 /*
 570  * Parse the object referred by ref, and grab needed value.
 571  */
 572 static void populate_value(struct refinfo *ref)
 573 {
 574         void *buf;
 575         struct object *obj;
 576         int eaten, i;
 577         unsigned long size;
 578         const unsigned char *tagged;
 579
 580         ref->value = xcalloc(sizeof(struct atom_value), used_atom_cnt);
 581
 582         if (need_symref && (ref->flag & REF_ISSYMREF) && !ref->symref) {
 583                 unsigned char unused1[20];
 584                 const char *symref;
 585                 symref = resolve_ref(ref->refname, unused1, 1, NULL);
 586                 if (symref)
 587                         ref->symref = xstrdup(symref);
 588                 else
 589                         ref->symref = "";
 590         }
 591
 592         /* Fill in specials first */
 593         for (i = 0; i < used_atom_cnt; i++) {
 594                 const char *name = used_atom[i];
 595                 struct atom_value *v = &ref->value[i];
 596                 int deref = 0;
 597                 const char *refname;
 598                 const char *formatp;
 599
 600                 if (*name == '*') {
 601                         deref = 1;
 602                         name++;
 603                 }
 604
 605                 if (!prefixcmp(name, "refname"))
 606                         refname = ref->refname;
 607                 else if (!prefixcmp(name, "symref"))
 608                         refname = ref->symref ? ref->symref : "";
 609                 else if (!prefixcmp(name, "upstream")) {
 610                         struct branch *branch;
 611                         /* only local branches may have an upstream */
 612                         if (prefixcmp(ref->refname, "refs/heads/"))
 613                                 continue;
 614                         branch = branch_get(ref->refname + 11);
 615
 616                         if (!branch || !branch->merge || !branch->merge[0] ||
 617                             !branch->merge[0]->dst)
 618                                 continue;
 619                         refname = branch->merge[0]->dst;
 620                 }
 621                 else if (!strcmp(name, "flag")) {
 622                         char buf[256], *cp = buf;
 623                         if (ref->flag & REF_ISSYMREF)
 624                                 cp = copy_advance(cp, ",symref");
 625                         if (ref->flag & REF_ISPACKED)
 626                                 cp = copy_advance(cp, ",packed");
 627                         if (cp == buf)
 628                                 v->s = "";
 629                         else {
 630                                 *cp = '\0';
 631                                 v->s = xstrdup(buf + 1);
 632                         }
 633                         continue;
 634                 }
 635                 else
 636                         continue;
 637
 638                 formatp = strchr(name, ':');
 639                 /* look for "short" refname format */
 640                 if (formatp) {
 641                         formatp++;
 642                         if (!strcmp(formatp, "short"))
 643                                 refname = shorten_unambiguous_ref(refname,
 644                                                       warn_ambiguous_refs);
 645                         else
 646                                 die("unknown %.*s format %s",
 647                                     (int)(formatp - name), name, formatp);
 648                 }
 649
 650                 if (!deref)
 651                         v->s = refname;
 652                 else {
 653                         int len = strlen(refname);
 654                         char *s = xmalloc(len + 4);
 655                         sprintf(s, "%s^{}", refname);
 656                         v->s = s;
 657                 }
 658         }
 659
 660         for (i = 0; i < used_atom_cnt; i++) {
 661                 struct atom_value *v = &ref->value[i];
 662                 if (v->s == NULL)
 663                         goto need_obj;
 664         }
 665         return;
 666
 667  need_obj:
 668         buf = get_obj(ref->objectname, &obj, &size, &eaten);
 669         if (!buf)
 670                 die("missing object %s for %s",
 671                     sha1_to_hex(ref->objectname), ref->refname);
 672         if (!obj)
 673                 die("parse_object_buffer failed on %s for %s",
 674                     sha1_to_hex(ref->objectname), ref->refname);
 675
 676         grab_values(ref->value, 0, obj, buf, size);
 677         if (!eaten)
 678                 free(buf);
 679
 680         /*
 681          * If there is no atom that wants to know about tagged
 682          * object, we are done.
 683          */
 684         if (!need_tagged || (obj->type != OBJ_TAG))
 685                 return;
 686
 687         /*
 688          * If it is a tag object, see if we use a value that derefs
 689          * the object, and if we do grab the object it refers to.
 690          */
 691         tagged = ((struct tag *)obj)->tagged->sha1;
 692
 693         /*
 694          * NEEDSWORK: This derefs tag only once, which
 695          * is good to deal with chains of trust, but
 696          * is not consistent with what deref_tag() does
 697          * which peels the onion to the core.
 698          */
 699         buf = get_obj(tagged, &obj, &size, &eaten);
 700         if (!buf)
 701                 die("missing object %s for %s",
 702                     sha1_to_hex(tagged), ref->refname);
 703         if (!obj)
 704                 die("parse_object_buffer failed on %s for %s",
 705                     sha1_to_hex(tagged), ref->refname);
 706         grab_values(ref->value, 1, obj, buf, size);
 707         if (!eaten)
 708                 free(buf);
 709 }
 710
 711 /*
 712  * Given a ref, return the value for the atom.  This lazily gets value
 713  * out of the object by calling populate value.
 714  */
 715 static void get_value(struct refinfo *ref, int atom, struct atom_value **v)
 716 {
 717         if (!ref->value) {
 718                 populate_value(ref);
 719                 fill_missing_values(ref->value);
 720         }
 721         *v = &ref->value[atom];
 722 }
 723
 724 struct grab_ref_cbdata {
 725         struct refinfo **grab_array;
 726         const char **grab_pattern;
 727         int grab_cnt;
 728 };
 729
 730 /*
 731  * A call-back given to for_each_ref().  Filter refs and keep them for
 732  * later object processing.
 733  */
 734 static int grab_single_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 735 {
 736         struct grab_ref_cbdata *cb = cb_data;
 737         struct refinfo *ref;
 738         int cnt;
 739
 740         if (*cb->grab_pattern) {
 741                 const char **pattern;
 742                 int namelen = strlen(refname);
 743                 for (pattern = cb->grab_pattern; *pattern; pattern++) {
 744                         const char *p = *pattern;
 745                         int plen = strlen(p);
 746
 747                         if ((plen <= namelen) &&
 748                             !strncmp(refname, p, plen) &&
 749                             (refname[plen] == '\0' ||
 750                              refname[plen] == '/' ||
 751                              p[plen-1] == '/'))
 752                                 break;
 753                         if (!fnmatch(p, refname, FNM_PATHNAME))
 754                                 break;
 755                 }
 756                 if (!*pattern)
 757                         return 0;
 758         }
 759
 760         /*
 761          * We do not open the object yet; sort may only need refname
 762          * to do its job and the resulting list may yet to be pruned
 763          * by maxcount logic.
 764          */
 765         ref = xcalloc(1, sizeof(*ref));
 766         ref->refname = xstrdup(refname);
 767         hashcpy(ref->objectname, sha1);
 768         ref->flag = flag;
 769
 770         cnt = cb->grab_cnt;
 771         cb->grab_array = xrealloc(cb->grab_array,
 772                                   sizeof(*cb->grab_array) * (cnt + 1));
 773         cb->grab_array[cnt++] = ref;
 774         cb->grab_cnt = cnt;
 775         return 0;
 776 }
 777
 778 static int cmp_ref_sort(struct ref_sort *s, struct refinfo *a, struct refinfo *b)
 779 {
 780         struct atom_value *va, *vb;
 781         int cmp;
 782         cmp_type cmp_type = used_atom_type[s->atom];
 783
 784         get_value(a, s->atom, &va);
 785         get_value(b, s->atom, &vb);
 786         switch (cmp_type) {
 787         case FIELD_STR:
 788                 cmp = strcmp(va->s, vb->s);
 789                 break;
 790         default:
 791                 if (va->ul < vb->ul)
 792                         cmp = -1;
 793                 else if (va->ul == vb->ul)
 794                         cmp = 0;
 795                 else
 796                         cmp = 1;
 797                 break;
 798         }
 799         return (s->reverse) ? -cmp : cmp;
 800 }
 801
 802 static struct ref_sort *ref_sort;
 803 static int compare_refs(const void *a_, const void *b_)
 804 {
 805         struct refinfo *a = *((struct refinfo **)a_);
 806         struct refinfo *b = *((struct refinfo **)b_);
 807         struct ref_sort *s;
 808
 809         for (s = ref_sort; s; s = s->next) {
 810                 int cmp = cmp_ref_sort(s, a, b);
 811                 if (cmp)
 812                         return cmp;
 813         }
 814         return 0;
 815 }
 816
 817 static void sort_refs(struct ref_sort *sort, struct refinfo **refs, int num_refs)
 818 {
 819         ref_sort = sort;
 820         qsort(refs, num_refs, sizeof(struct refinfo *), compare_refs);
 821 }
 822
 823 static void print_value(struct refinfo *ref, int atom, int quote_style)
 824 {
 825         struct atom_value *v;
 826         get_value(ref, atom, &v);
 827         switch (quote_style) {
 828         case QUOTE_NONE:
 829                 fputs(v->s, stdout);
 830                 break;
 831         case QUOTE_SHELL:
 832                 sq_quote_print(stdout, v->s);
 833                 break;
 834         case QUOTE_PERL:
 835                 perl_quote_print(stdout, v->s);
 836                 break;
 837         case QUOTE_PYTHON:
 838                 python_quote_print(stdout, v->s);
 839                 break;
 840         case QUOTE_TCL:
 841                 tcl_quote_print(stdout, v->s);
 842                 break;
 843         }
 844 }
 845
 846 static int hex1(char ch)
 847 {
 848         if ('0' <= ch && ch <= '9')
 849                 return ch - '0';
 850         else if ('a' <= ch && ch <= 'f')
 851                 return ch - 'a' + 10;
 852         else if ('A' <= ch && ch <= 'F')
 853                 return ch - 'A' + 10;
 854         return -1;
 855 }
 856 static int hex2(const char *cp)
 857 {
 858         if (cp[0] && cp[1])
 859                 return (hex1(cp[0]) << 4) | hex1(cp[1]);
 860         else
 861                 return -1;
 862 }
 863
 864 static void emit(const char *cp, const char *ep)
 865 {
 866         while (*cp && (!ep || cp < ep)) {
 867                 if (*cp == '%') {
 868                         if (cp[1] == '%')
 869                                 cp++;
 870                         else {
 871                                 int ch = hex2(cp + 1);
 872                                 if (0 <= ch) {
 873                                         putchar(ch);
 874                                         cp += 3;
 875                                         continue;
 876                                 }
 877                         }
 878                 }
 879                 putchar(*cp);
 880                 cp++;
 881         }
 882 }
 883
 884 static void show_ref(struct refinfo *info, const char *format, int quote_style)
 885 {
 886         const char *cp, *sp, *ep;
 887
 888         for (cp = format; *cp && (sp = find_next(cp)); cp = ep + 1) {
 889                 ep = strchr(sp, ')');
 890                 if (cp < sp)
 891                         emit(cp, sp);
 892                 print_value(info, parse_atom(sp + 2, ep), quote_style);
 893         }
 894         if (*cp) {
 895                 sp = cp + strlen(cp);
 896                 emit(cp, sp);
 897         }
 898         putchar('\n');
 899 }
 900
 901 static struct ref_sort *default_sort(void)
 902 {
 903         static const char cstr_name[] = "refname";
 904
 905         struct ref_sort *sort = xcalloc(1, sizeof(*sort));
 906
 907         sort->next = NULL;
 908         sort->atom = parse_atom(cstr_name, cstr_name + strlen(cstr_name));
 909         return sort;
 910 }
 911
 912 static int opt_parse_sort(const struct option *opt, const char *arg, int unset)
 913 {
 914         struct ref_sort **sort_tail = opt->value;
 915         struct ref_sort *s;
 916         int len;
 917
 918         if (!arg) /* should --no-sort void the list ? */
 919                 return -1;
 920
 921         *sort_tail = s = xcalloc(1, sizeof(*s));
 922
 923         if (*arg == '-') {
 924                 s->reverse = 1;
 925                 arg++;
 926         }
 927         len = strlen(arg);
 928         s->atom = parse_atom(arg, arg+len);
 929         return 0;
 930 }
 931
 932 static char const * const for_each_ref_usage[] = {
 933         "git for-each-ref [options] [<pattern>]",
 934         NULL
 935 };
 936
 937 int cmd_for_each_ref(int argc, const char **argv, const char *prefix)
 938 {
 939         int i, num_refs;
 940         const char *format = "%(objectname) %(objecttype)\t%(refname)";
 941         struct ref_sort *sort = NULL, **sort_tail = &sort;
 942         int maxcount = 0, quote_style = 0;
 943         struct refinfo **refs;
 944         struct grab_ref_cbdata cbdata;
 945
 946         struct option opts[] = {
 947                 OPT_BIT('s', "shell", &quote_style,
 948                         "quote placeholders suitably for shells", QUOTE_SHELL),
 949                 OPT_BIT('p', "perl",  &quote_style,
 950                         "quote placeholders suitably for perl", QUOTE_PERL),
 951                 OPT_BIT(0 , "python", &quote_style,
 952                         "quote placeholders suitably for python", QUOTE_PYTHON),
 953                 OPT_BIT(0 , "tcl",  &quote_style,
 954                         "quote placeholders suitably for tcl", QUOTE_TCL),
 955
 956                 OPT_GROUP(""),
 957                 OPT_INTEGER( 0 , "count", &maxcount, "show only <n> matched refs"),
 958                 OPT_STRING(  0 , "format", &format, "format", "format to use for the output"),
 959                 OPT_CALLBACK(0 , "sort", sort_tail, "key",
 960                             "field name to sort on", &opt_parse_sort),
 961                 OPT_END(),
 962         };
 963
 964         parse_options(argc, argv, prefix, opts, for_each_ref_usage, 0);
 965         if (maxcount < 0) {
 966                 error("invalid --count argument: `%d'", maxcount);
 967                 usage_with_options(for_each_ref_usage, opts);
 968         }
 969         if (HAS_MULTI_BITS(quote_style)) {
 970                 error("more than one quoting style?");
 971                 usage_with_options(for_each_ref_usage, opts);
 972         }
 973         if (verify_format(format))
 974                 usage_with_options(for_each_ref_usage, opts);
 975
 976         if (!sort)
 977                 sort = default_sort();
 978         sort_atom_limit = used_atom_cnt;
 979
 980         /* for warn_ambiguous_refs */
 981         git_config(git_default_config, NULL);
 982
 983         memset(&cbdata, 0, sizeof(cbdata));
 984         cbdata.grab_pattern = argv;
 985         for_each_rawref(grab_single_ref, &cbdata);
 986         refs = cbdata.grab_array;
 987         num_refs = cbdata.grab_cnt;
 988
 989         sort_refs(sort, refs, num_refs);
 990
 991         if (!maxcount || num_refs < maxcount)
 992                 maxcount = num_refs;
 993         for (i = 0; i < maxcount; i++)
 994                 show_ref(refs[i], format, quote_style);
 995         return 0;
 996 }