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)
 360 {
 361         const char *eoemail = strstr(buf, "> ");
 362         char *zone;
 363         unsigned long timestamp;
 364         long tz;
 365
 366         if (!eoemail)
 367                 goto bad;
 368         timestamp = strtoul(eoemail + 2, &zone, 10);
 369         if (timestamp == ULONG_MAX)
 370                 goto bad;
 371         tz = strtol(zone, NULL, 10);
 372         if ((tz == LONG_MIN || tz == LONG_MAX) && errno == ERANGE)
 373                 goto bad;
 374         v->s = xstrdup(show_date(timestamp, tz, 0));
 375         v->ul = timestamp;
 376         return;
 377  bad:
 378         v->s = "";
 379         v->ul = 0;
 380 }
 381
 382 /* See grab_values */
 383 static void grab_person(const char *who, struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 384 {
 385         int i;
 386         int wholen = strlen(who);
 387         const char *wholine = NULL;
 388
 389         for (i = 0; i < used_atom_cnt; i++) {
 390                 const char *name = used_atom[i];
 391                 struct atom_value *v = &val[i];
 392                 if (!!deref != (*name == '*'))
 393                         continue;
 394                 if (deref)
 395                         name++;
 396                 if (strncmp(who, name, wholen))
 397                         continue;
 398                 if (name[wholen] != 0 &&
 399                     strcmp(name + wholen, "name") &&
 400                     strcmp(name + wholen, "email") &&
 401                     strcmp(name + wholen, "date"))
 402                         continue;
 403                 if (!wholine)
 404                         wholine = find_wholine(who, wholen, buf, sz);
 405                 if (!wholine)
 406                         return; /* no point looking for it */
 407                 if (name[wholen] == 0)
 408                         v->s = copy_line(wholine);
 409                 else if (!strcmp(name + wholen, "name"))
 410                         v->s = copy_name(wholine);
 411                 else if (!strcmp(name + wholen, "email"))
 412                         v->s = copy_email(wholine);
 413                 else if (!strcmp(name + wholen, "date"))
 414                         grab_date(wholine, v);
 415         }
 416
 417         /* For a tag or a commit object, if "creator" or "creatordate" is
 418          * requested, do something special.
 419          */
 420         if (strcmp(who, "tagger") && strcmp(who, "committer"))
 421                 return; /* "author" for commit object is not wanted */
 422         if (!wholine)
 423                 wholine = find_wholine(who, wholen, buf, sz);
 424         if (!wholine)
 425                 return;
 426         for (i = 0; i < used_atom_cnt; i++) {
 427                 const char *name = used_atom[i];
 428                 struct atom_value *v = &val[i];
 429                 if (!!deref != (*name == '*'))
 430                         continue;
 431                 if (deref)
 432                         name++;
 433
 434                 if (!strcmp(name, "creatordate"))
 435                         grab_date(wholine, v);
 436                 else if (!strcmp(name, "creator"))
 437                         v->s = copy_line(wholine);
 438         }
 439 }
 440
 441 static void find_subpos(const char *buf, unsigned long sz, const char **sub, const char **body)
 442 {
 443         while (*buf) {
 444                 const char *eol = strchr(buf, '\n');
 445                 if (!eol)
 446                         return;
 447                 if (eol[1] == '\n') {
 448                         buf = eol + 1;
 449                         break; /* found end of header */
 450                 }
 451                 buf = eol + 1;
 452         }
 453         while (*buf == '\n')
 454                 buf++;
 455         if (!*buf)
 456                 return;
 457         *sub = buf; /* first non-empty line */
 458         buf = strchr(buf, '\n');
 459         if (!buf)
 460                 return; /* no body */
 461         while (*buf == '\n')
 462                 buf++; /* skip blank between subject and body */
 463         *body = buf;
 464 }
 465
 466 /* See grab_values */
 467 static void grab_sub_body_contents(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 468 {
 469         int i;
 470         const char *subpos = NULL, *bodypos = NULL;
 471
 472         for (i = 0; i < used_atom_cnt; i++) {
 473                 const char *name = used_atom[i];
 474                 struct atom_value *v = &val[i];
 475                 if (!!deref != (*name == '*'))
 476                         continue;
 477                 if (deref)
 478                         name++;
 479                 if (strcmp(name, "subject") &&
 480                     strcmp(name, "body") &&
 481                     strcmp(name, "contents"))
 482                         continue;
 483                 if (!subpos)
 484                         find_subpos(buf, sz, &subpos, &bodypos);
 485                 if (!subpos)
 486                         return;
 487
 488                 if (!strcmp(name, "subject"))
 489                         v->s = copy_line(subpos);
 490                 else if (!strcmp(name, "body"))
 491                         v->s = xstrdup(bodypos);
 492                 else if (!strcmp(name, "contents"))
 493                         v->s = xstrdup(subpos);
 494         }
 495 }
 496
 497 /* We want to have empty print-string for field requests
 498  * that do not apply (e.g. "authordate" for a tag object)
 499  */
 500 static void fill_missing_values(struct atom_value *val)
 501 {
 502         int i;
 503         for (i = 0; i < used_atom_cnt; i++) {
 504                 struct atom_value *v = &val[i];
 505                 if (v->s == NULL)
 506                         v->s = "";
 507         }
 508 }
 509
 510 /*
 511  * val is a list of atom_value to hold returned values.  Extract
 512  * the values for atoms in used_atom array out of (obj, buf, sz).
 513  * when deref is false, (obj, buf, sz) is the object that is
 514  * pointed at by the ref itself; otherwise it is the object the
 515  * ref (which is a tag) refers to.
 516  */
 517 static void grab_values(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 518 {
 519         grab_common_values(val, deref, obj, buf, sz);
 520         switch (obj->type) {
 521         case OBJ_TAG:
 522                 grab_tag_values(val, deref, obj, buf, sz);
 523                 grab_sub_body_contents(val, deref, obj, buf, sz);
 524                 grab_person("tagger", val, deref, obj, buf, sz);
 525                 break;
 526         case OBJ_COMMIT:
 527                 grab_commit_values(val, deref, obj, buf, sz);
 528                 grab_sub_body_contents(val, deref, obj, buf, sz);
 529                 grab_person("author", val, deref, obj, buf, sz);
 530                 grab_person("committer", val, deref, obj, buf, sz);
 531                 break;
 532         case OBJ_TREE:
 533                 // grab_tree_values(val, deref, obj, buf, sz);
 534                 break;
 535         case OBJ_BLOB:
 536                 // grab_blob_values(val, deref, obj, buf, sz);
 537                 break;
 538         default:
 539                 die("Eh?  Object of type %d?", obj->type);
 540         }
 541 }
 542
 543 /*
 544  * Parse the object referred by ref, and grab needed value.
 545  */
 546 static void populate_value(struct refinfo *ref)
 547 {
 548         void *buf;
 549         struct object *obj;
 550         int eaten, i;
 551         unsigned long size;
 552         const unsigned char *tagged;
 553
 554         ref->value = xcalloc(sizeof(struct atom_value), used_atom_cnt);
 555
 556         buf = get_obj(ref->objectname, &obj, &size, &eaten);
 557         if (!buf)
 558                 die("missing object %s for %s",
 559                     sha1_to_hex(ref->objectname), ref->refname);
 560         if (!obj)
 561                 die("parse_object_buffer failed on %s for %s",
 562                     sha1_to_hex(ref->objectname), ref->refname);
 563
 564         /* Fill in specials first */
 565         for (i = 0; i < used_atom_cnt; i++) {
 566                 const char *name = used_atom[i];
 567                 struct atom_value *v = &ref->value[i];
 568                 if (!strcmp(name, "refname"))
 569                         v->s = ref->refname;
 570                 else if (!strcmp(name, "*refname")) {
 571                         int len = strlen(ref->refname);
 572                         char *s = xmalloc(len + 4);
 573                         sprintf(s, "%s^{}", ref->refname);
 574                         v->s = s;
 575                 }
 576         }
 577
 578         grab_values(ref->value, 0, obj, buf, size);
 579         if (!eaten)
 580                 free(buf);
 581
 582         /* If there is no atom that wants to know about tagged
 583          * object, we are done.
 584          */
 585         if (!need_tagged || (obj->type != OBJ_TAG))
 586                 return;
 587
 588         /* If it is a tag object, see if we use a value that derefs
 589          * the object, and if we do grab the object it refers to.
 590          */
 591         tagged = ((struct tag *)obj)->tagged->sha1;
 592
 593         /* NEEDSWORK: This derefs tag only once, which
 594          * is good to deal with chains of trust, but
 595          * is not consistent with what deref_tag() does
 596          * which peels the onion to the core.
 597          */
 598         buf = get_obj(tagged, &obj, &size, &eaten);
 599         if (!buf)
 600                 die("missing object %s for %s",
 601                     sha1_to_hex(tagged), ref->refname);
 602         if (!obj)
 603                 die("parse_object_buffer failed on %s for %s",
 604                     sha1_to_hex(tagged), ref->refname);
 605         grab_values(ref->value, 1, obj, buf, size);
 606         if (!eaten)
 607                 free(buf);
 608 }
 609
 610 /*
 611  * Given a ref, return the value for the atom.  This lazily gets value
 612  * out of the object by calling populate value.
 613  */
 614 static void get_value(struct refinfo *ref, int atom, struct atom_value **v)
 615 {
 616         if (!ref->value) {
 617                 populate_value(ref);
 618                 fill_missing_values(ref->value);
 619         }
 620         *v = &ref->value[atom];
 621 }
 622
 623 struct grab_ref_cbdata {
 624         struct refinfo **grab_array;
 625         const char **grab_pattern;
 626         int grab_cnt;
 627 };
 628
 629 /*
 630  * A call-back given to for_each_ref().  It is unfortunate that we
 631  * need to use global variables to pass extra information to this
 632  * function.
 633  */
 634 static int grab_single_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 635 {
 636         struct grab_ref_cbdata *cb = cb_data;
 637         struct refinfo *ref;
 638         int cnt;
 639
 640         if (*cb->grab_pattern) {
 641                 const char **pattern;
 642                 int namelen = strlen(refname);
 643                 for (pattern = cb->grab_pattern; *pattern; pattern++) {
 644                         const char *p = *pattern;
 645                         int plen = strlen(p);
 646
 647                         if ((plen <= namelen) &&
 648                             !strncmp(refname, p, plen) &&
 649                             (refname[plen] == '\0' ||
 650                              refname[plen] == '/'))
 651                                 break;
 652                         if (!fnmatch(p, refname, FNM_PATHNAME))
 653                                 break;
 654                 }
 655                 if (!*pattern)
 656                         return 0;
 657         }
 658
 659         /* We do not open the object yet; sort may only need refname
 660          * to do its job and the resulting list may yet to be pruned
 661          * by maxcount logic.
 662          */
 663         ref = xcalloc(1, sizeof(*ref));
 664         ref->refname = xstrdup(refname);
 665         hashcpy(ref->objectname, sha1);
 666
 667         cnt = cb->grab_cnt;
 668         cb->grab_array = xrealloc(cb->grab_array,
 669                                   sizeof(*cb->grab_array) * (cnt + 1));
 670         cb->grab_array[cnt++] = ref;
 671         cb->grab_cnt = cnt;
 672         return 0;
 673 }
 674
 675 static int cmp_ref_sort(struct ref_sort *s, struct refinfo *a, struct refinfo *b)
 676 {
 677         struct atom_value *va, *vb;
 678         int cmp;
 679         cmp_type cmp_type = used_atom_type[s->atom];
 680
 681         get_value(a, s->atom, &va);
 682         get_value(b, s->atom, &vb);
 683         switch (cmp_type) {
 684         case FIELD_STR:
 685                 cmp = strcmp(va->s, vb->s);
 686                 break;
 687         default:
 688                 if (va->ul < vb->ul)
 689                         cmp = -1;
 690                 else if (va->ul == vb->ul)
 691                         cmp = 0;
 692                 else
 693                         cmp = 1;
 694                 break;
 695         }
 696         return (s->reverse) ? -cmp : cmp;
 697 }
 698
 699 static struct ref_sort *ref_sort;
 700 static int compare_refs(const void *a_, const void *b_)
 701 {
 702         struct refinfo *a = *((struct refinfo **)a_);
 703         struct refinfo *b = *((struct refinfo **)b_);
 704         struct ref_sort *s;
 705
 706         for (s = ref_sort; s; s = s->next) {
 707                 int cmp = cmp_ref_sort(s, a, b);
 708                 if (cmp)
 709                         return cmp;
 710         }
 711         return 0;
 712 }
 713
 714 static void sort_refs(struct ref_sort *sort, struct refinfo **refs, int num_refs)
 715 {
 716         ref_sort = sort;
 717         qsort(refs, num_refs, sizeof(struct refinfo *), compare_refs);
 718 }
 719
 720 static void print_value(struct refinfo *ref, int atom, int quote_style)
 721 {
 722         struct atom_value *v;
 723         get_value(ref, atom, &v);
 724         switch (quote_style) {
 725         case QUOTE_NONE:
 726                 fputs(v->s, stdout);
 727                 break;
 728         case QUOTE_SHELL:
 729                 sq_quote_print(stdout, v->s);
 730                 break;
 731         case QUOTE_PERL:
 732                 perl_quote_print(stdout, v->s);
 733                 break;
 734         case QUOTE_PYTHON:
 735                 python_quote_print(stdout, v->s);
 736                 break;
 737         case QUOTE_TCL:
 738                 tcl_quote_print(stdout, v->s);
 739                 break;
 740         }
 741 }
 742
 743 static int hex1(char ch)
 744 {
 745         if ('0' <= ch && ch <= '9')
 746                 return ch - '0';
 747         else if ('a' <= ch && ch <= 'f')
 748                 return ch - 'a' + 10;
 749         else if ('A' <= ch && ch <= 'F')
 750                 return ch - 'A' + 10;
 751         return -1;
 752 }
 753 static int hex2(const char *cp)
 754 {
 755         if (cp[0] && cp[1])
 756                 return (hex1(cp[0]) << 4) | hex1(cp[1]);
 757         else
 758                 return -1;
 759 }
 760
 761 static void emit(const char *cp, const char *ep)
 762 {
 763         while (*cp && (!ep || cp < ep)) {
 764                 if (*cp == '%') {
 765                         if (cp[1] == '%')
 766                                 cp++;
 767                         else {
 768                                 int ch = hex2(cp + 1);
 769                                 if (0 <= ch) {
 770                                         putchar(ch);
 771                                         cp += 3;
 772                                         continue;
 773                                 }
 774                         }
 775                 }
 776                 putchar(*cp);
 777                 cp++;
 778         }
 779 }
 780
 781 static void show_ref(struct refinfo *info, const char *format, int quote_style)
 782 {
 783         const char *cp, *sp, *ep;
 784
 785         for (cp = format; *cp && (sp = find_next(cp)); cp = ep + 1) {
 786                 ep = strchr(sp, ')');
 787                 if (cp < sp)
 788                         emit(cp, sp);
 789                 print_value(info, parse_atom(sp + 2, ep), quote_style);
 790         }
 791         if (*cp) {
 792                 sp = cp + strlen(cp);
 793                 emit(cp, sp);
 794         }
 795         putchar('\n');
 796 }
 797
 798 static struct ref_sort *default_sort(void)
 799 {
 800         static const char cstr_name[] = "refname";
 801
 802         struct ref_sort *sort = xcalloc(1, sizeof(*sort));
 803
 804         sort->next = NULL;
 805         sort->atom = parse_atom(cstr_name, cstr_name + strlen(cstr_name));
 806         return sort;
 807 }
 808
 809 int cmd_for_each_ref(int ac, const char **av, const char *prefix)
 810 {
 811         int i, num_refs;
 812         const char *format = NULL;
 813         struct ref_sort *sort = NULL, **sort_tail = &sort;
 814         int maxcount = 0;
 815         int quote_style = -1; /* unspecified yet */
 816         struct refinfo **refs;
 817         struct grab_ref_cbdata cbdata;
 818
 819         for (i = 1; i < ac; i++) {
 820                 const char *arg = av[i];
 821                 if (arg[0] != '-')
 822                         break;
 823                 if (!strcmp(arg, "--")) {
 824                         i++;
 825                         break;
 826                 }
 827                 if (!prefixcmp(arg, "--format=")) {
 828                         if (format)
 829                                 die("more than one --format?");
 830                         format = arg + 9;
 831                         continue;
 832                 }
 833                 if (!strcmp(arg, "-s") || !strcmp(arg, "--shell") ) {
 834                         if (0 <= quote_style)
 835                                 die("more than one quoting style?");
 836                         quote_style = QUOTE_SHELL;
 837                         continue;
 838                 }
 839                 if (!strcmp(arg, "-p") || !strcmp(arg, "--perl") ) {
 840                         if (0 <= quote_style)
 841                                 die("more than one quoting style?");
 842                         quote_style = QUOTE_PERL;
 843                         continue;
 844                 }
 845                 if (!strcmp(arg, "--python") ) {
 846                         if (0 <= quote_style)
 847                                 die("more than one quoting style?");
 848                         quote_style = QUOTE_PYTHON;
 849                         continue;
 850                 }
 851                 if (!strcmp(arg, "--tcl") ) {
 852                         if (0 <= quote_style)
 853                                 die("more than one quoting style?");
 854                         quote_style = QUOTE_TCL;
 855                         continue;
 856                 }
 857                 if (!prefixcmp(arg, "--count=")) {
 858                         if (maxcount)
 859                                 die("more than one --count?");
 860                         maxcount = atoi(arg + 8);
 861                         if (maxcount <= 0)
 862                                 die("The number %s did not parse", arg);
 863                         continue;
 864                 }
 865                 if (!prefixcmp(arg, "--sort=")) {
 866                         struct ref_sort *s = xcalloc(1, sizeof(*s));
 867                         int len;
 868
 869                         s->next = NULL;
 870                         *sort_tail = s;
 871                         sort_tail = &s->next;
 872
 873                         arg += 7;
 874                         if (*arg == '-') {
 875                                 s->reverse = 1;
 876                                 arg++;
 877                         }
 878                         len = strlen(arg);
 879                         sort->atom = parse_atom(arg, arg+len);
 880                         continue;
 881                 }
 882                 break;
 883         }
 884         if (quote_style < 0)
 885                 quote_style = QUOTE_NONE;
 886
 887         if (!sort)
 888                 sort = default_sort();
 889         sort_atom_limit = used_atom_cnt;
 890         if (!format)
 891                 format = "%(objectname) %(objecttype)\t%(refname)";
 892
 893         verify_format(format);
 894
 895         memset(&cbdata, 0, sizeof(cbdata));
 896         cbdata.grab_pattern = av + i;
 897         for_each_ref(grab_single_ref, &cbdata);
 898         refs = cbdata.grab_array;
 899         num_refs = cbdata.grab_cnt;
 900
 901         for (i = 0; i < used_atom_cnt; i++) {
 902                 if (used_atom[i][0] == '*') {
 903                         need_tagged = 1;
 904                         break;
 905                 }
 906         }
 907
 908         sort_refs(sort, refs, num_refs);
 909
 910         if (!maxcount || num_refs < maxcount)
 911                 maxcount = num_refs;
 912         for (i = 0; i < maxcount; i++)
 913                 show_ref(refs[i], format, quote_style);
 914         return 0;
 915 }