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" },
  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                 if (len == ep - sp && !memcmp(valid_atom[i].name, sp, len))
 110                         break;
 111         }
 112
 113         if (ARRAY_SIZE(valid_atom) <= i)
 114                 die("unknown field name: %.*s", (int)(ep-atom), atom);
 115
 116         /* Add it in, including the deref prefix */
 117         at = used_atom_cnt;
 118         used_atom_cnt++;
 119         used_atom = xrealloc(used_atom,
 120                              (sizeof *used_atom) * used_atom_cnt);
 121         used_atom_type = xrealloc(used_atom_type,
 122                                   (sizeof(*used_atom_type) * used_atom_cnt));
 123         n = xmalloc(ep - atom + 1);
 124         memcpy(n, atom, ep - atom);
 125         n[ep-atom] = 0;
 126         used_atom[at] = n;
 127         used_atom_type[at] = valid_atom[i].cmp_type;
 128         return at;
 129 }
 130
 131 /*
 132  * In a format string, find the next occurrence of %(atom).
 133  */
 134 static const char *find_next(const char *cp)
 135 {
 136         while (*cp) {
 137                 if (*cp == '%') {
 138                         /* %( is the start of an atom;
 139                          * %% is a quoted per-cent.
 140                          */
 141                         if (cp[1] == '(')
 142                                 return cp;
 143                         else if (cp[1] == '%')
 144                                 cp++; /* skip over two % */
 145                         /* otherwise this is a singleton, literal % */
 146                 }
 147                 cp++;
 148         }
 149         return NULL;
 150 }
 151
 152 /*
 153  * Make sure the format string is well formed, and parse out
 154  * the used atoms.
 155  */
 156 static void verify_format(const char *format)
 157 {
 158         const char *cp, *sp;
 159         for (cp = format; *cp && (sp = find_next(cp)); ) {
 160                 const char *ep = strchr(sp, ')');
 161                 if (!ep)
 162                         die("malformatted format string %s", sp);
 163                 /* sp points at "%(" and ep points at the closing ")" */
 164                 parse_atom(sp + 2, ep);
 165                 cp = ep + 1;
 166         }
 167 }
 168
 169 /*
 170  * Given an object name, read the object data and size, and return a
 171  * "struct object".  If the object data we are returning is also borrowed
 172  * by the "struct object" representation, set *eaten as well---it is a
 173  * signal from parse_object_buffer to us not to free the buffer.
 174  */
 175 static void *get_obj(const unsigned char *sha1, struct object **obj, unsigned long *sz, int *eaten)
 176 {
 177         enum object_type type;
 178         void *buf = read_sha1_file(sha1, &type, sz);
 179
 180         if (buf)
 181                 *obj = parse_object_buffer(sha1, type, *sz, buf, eaten);
 182         else
 183                 *obj = NULL;
 184         return buf;
 185 }
 186
 187 /* See grab_values */
 188 static void grab_common_values(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 189 {
 190         int i;
 191
 192         for (i = 0; i < used_atom_cnt; i++) {
 193                 const char *name = used_atom[i];
 194                 struct atom_value *v = &val[i];
 195                 if (!!deref != (*name == '*'))
 196                         continue;
 197                 if (deref)
 198                         name++;
 199                 if (!strcmp(name, "objecttype"))
 200                         v->s = typename(obj->type);
 201                 else if (!strcmp(name, "objectsize")) {
 202                         char *s = xmalloc(40);
 203                         sprintf(s, "%lu", sz);
 204                         v->ul = sz;
 205                         v->s = s;
 206                 }
 207                 else if (!strcmp(name, "objectname")) {
 208                         char *s = xmalloc(41);
 209                         strcpy(s, sha1_to_hex(obj->sha1));
 210                         v->s = s;
 211                 }
 212         }
 213 }
 214
 215 /* See grab_values */
 216 static void grab_tag_values(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 217 {
 218         int i;
 219         struct tag *tag = (struct tag *) obj;
 220
 221         for (i = 0; i < used_atom_cnt; i++) {
 222                 const char *name = used_atom[i];
 223                 struct atom_value *v = &val[i];
 224                 if (!!deref != (*name == '*'))
 225                         continue;
 226                 if (deref)
 227                         name++;
 228                 if (!strcmp(name, "tag"))
 229                         v->s = tag->tag;
 230         }
 231 }
 232
 233 static int num_parents(struct commit *commit)
 234 {
 235         struct commit_list *parents;
 236         int i;
 237
 238         for (i = 0, parents = commit->parents;
 239              parents;
 240              parents = parents->next)
 241                 i++;
 242         return i;
 243 }
 244
 245 /* See grab_values */
 246 static void grab_commit_values(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 247 {
 248         int i;
 249         struct commit *commit = (struct commit *) obj;
 250
 251         for (i = 0; i < used_atom_cnt; i++) {
 252                 const char *name = used_atom[i];
 253                 struct atom_value *v = &val[i];
 254                 if (!!deref != (*name == '*'))
 255                         continue;
 256                 if (deref)
 257                         name++;
 258                 if (!strcmp(name, "tree")) {
 259                         char *s = xmalloc(41);
 260                         strcpy(s, sha1_to_hex(commit->tree->object.sha1));
 261                         v->s = s;
 262                 }
 263                 if (!strcmp(name, "numparent")) {
 264                         char *s = xmalloc(40);
 265                         v->ul = num_parents(commit);
 266                         sprintf(s, "%lu", v->ul);
 267                         v->s = s;
 268                 }
 269                 else if (!strcmp(name, "parent")) {
 270                         int num = num_parents(commit);
 271                         int i;
 272                         struct commit_list *parents;
 273                         char *s = xmalloc(41 * num + 1);
 274                         v->s = s;
 275                         for (i = 0, parents = commit->parents;
 276                              parents;
 277                              parents = parents->next, i = i + 41) {
 278                                 struct commit *parent = parents->item;
 279                                 strcpy(s+i, sha1_to_hex(parent->object.sha1));
 280                                 if (parents->next)
 281                                         s[i+40] = ' ';
 282                         }
 283                         if (!i)
 284                                 *s = '\0';
 285                 }
 286         }
 287 }
 288
 289 static const char *find_wholine(const char *who, int wholen, const char *buf, unsigned long sz)
 290 {
 291         const char *eol;
 292         while (*buf) {
 293                 if (!strncmp(buf, who, wholen) &&
 294                     buf[wholen] == ' ')
 295                         return buf + wholen + 1;
 296                 eol = strchr(buf, '\n');
 297                 if (!eol)
 298                         return "";
 299                 eol++;
 300                 if (*eol == '\n')
 301                         return ""; /* end of header */
 302                 buf = eol;
 303         }
 304         return "";
 305 }
 306
 307 static const char *copy_line(const char *buf)
 308 {
 309         const char *eol = strchr(buf, '\n');
 310         char *line;
 311         int len;
 312         if (!eol)
 313                 return "";
 314         len = eol - buf;
 315         line = xmalloc(len + 1);
 316         memcpy(line, buf, len);
 317         line[len] = 0;
 318         return line;
 319 }
 320
 321 static const char *copy_name(const char *buf)
 322 {
 323         const char *eol = strchr(buf, '\n');
 324         const char *eoname = strstr(buf, " <");
 325         char *line;
 326         int len;
 327         if (!(eoname && eol && eoname < eol))
 328                 return "";
 329         len = eoname - buf;
 330         line = xmalloc(len + 1);
 331         memcpy(line, buf, len);
 332         line[len] = 0;
 333         return line;
 334 }
 335
 336 static const char *copy_email(const char *buf)
 337 {
 338         const char *email = strchr(buf, '<');
 339         const char *eoemail = strchr(email, '>');
 340         char *line;
 341         int len;
 342         if (!email || !eoemail)
 343                 return "";
 344         eoemail++;
 345         len = eoemail - email;
 346         line = xmalloc(len + 1);
 347         memcpy(line, email, len);
 348         line[len] = 0;
 349         return line;
 350 }
 351
 352 static void grab_date(const char *buf, struct atom_value *v)
 353 {
 354         const char *eoemail = strstr(buf, "> ");
 355         char *zone;
 356         unsigned long timestamp;
 357         long tz;
 358
 359         if (!eoemail)
 360                 goto bad;
 361         timestamp = strtoul(eoemail + 2, &zone, 10);
 362         if (timestamp == ULONG_MAX)
 363                 goto bad;
 364         tz = strtol(zone, NULL, 10);
 365         if ((tz == LONG_MIN || tz == LONG_MAX) && errno == ERANGE)
 366                 goto bad;
 367         v->s = xstrdup(show_date(timestamp, tz, 0));
 368         v->ul = timestamp;
 369         return;
 370  bad:
 371         v->s = "";
 372         v->ul = 0;
 373 }
 374
 375 /* See grab_values */
 376 static void grab_person(const char *who, struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 377 {
 378         int i;
 379         int wholen = strlen(who);
 380         const char *wholine = NULL;
 381
 382         for (i = 0; i < used_atom_cnt; i++) {
 383                 const char *name = used_atom[i];
 384                 struct atom_value *v = &val[i];
 385                 if (!!deref != (*name == '*'))
 386                         continue;
 387                 if (deref)
 388                         name++;
 389                 if (strncmp(who, name, wholen))
 390                         continue;
 391                 if (name[wholen] != 0 &&
 392                     strcmp(name + wholen, "name") &&
 393                     strcmp(name + wholen, "email") &&
 394                     strcmp(name + wholen, "date"))
 395                         continue;
 396                 if (!wholine)
 397                         wholine = find_wholine(who, wholen, buf, sz);
 398                 if (!wholine)
 399                         return; /* no point looking for it */
 400                 if (name[wholen] == 0)
 401                         v->s = copy_line(wholine);
 402                 else if (!strcmp(name + wholen, "name"))
 403                         v->s = copy_name(wholine);
 404                 else if (!strcmp(name + wholen, "email"))
 405                         v->s = copy_email(wholine);
 406                 else if (!strcmp(name + wholen, "date"))
 407                         grab_date(wholine, v);
 408         }
 409
 410         /* For a tag or a commit object, if "creator" or "creatordate" is
 411          * requested, do something special.
 412          */
 413         if (strcmp(who, "tagger") && strcmp(who, "committer"))
 414                 return; /* "author" for commit object is not wanted */
 415         if (!wholine)
 416                 wholine = find_wholine(who, wholen, buf, sz);
 417         if (!wholine)
 418                 return;
 419         for (i = 0; i < used_atom_cnt; i++) {
 420                 const char *name = used_atom[i];
 421                 struct atom_value *v = &val[i];
 422                 if (!!deref != (*name == '*'))
 423                         continue;
 424                 if (deref)
 425                         name++;
 426
 427                 if (!strcmp(name, "creatordate"))
 428                         grab_date(wholine, v);
 429                 else if (!strcmp(name, "creator"))
 430                         v->s = copy_line(wholine);
 431         }
 432 }
 433
 434 static void find_subpos(const char *buf, unsigned long sz, const char **sub, const char **body)
 435 {
 436         while (*buf) {
 437                 const char *eol = strchr(buf, '\n');
 438                 if (!eol)
 439                         return;
 440                 if (eol[1] == '\n') {
 441                         buf = eol + 1;
 442                         break; /* found end of header */
 443                 }
 444                 buf = eol + 1;
 445         }
 446         while (*buf == '\n')
 447                 buf++;
 448         if (!*buf)
 449                 return;
 450         *sub = buf; /* first non-empty line */
 451         buf = strchr(buf, '\n');
 452         if (!buf)
 453                 return; /* no body */
 454         while (*buf == '\n')
 455                 buf++; /* skip blank between subject and body */
 456         *body = buf;
 457 }
 458
 459 /* See grab_values */
 460 static void grab_sub_body_contents(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 461 {
 462         int i;
 463         const char *subpos = NULL, *bodypos = NULL;
 464
 465         for (i = 0; i < used_atom_cnt; i++) {
 466                 const char *name = used_atom[i];
 467                 struct atom_value *v = &val[i];
 468                 if (!!deref != (*name == '*'))
 469                         continue;
 470                 if (deref)
 471                         name++;
 472                 if (strcmp(name, "subject") &&
 473                     strcmp(name, "body") &&
 474                     strcmp(name, "contents"))
 475                         continue;
 476                 if (!subpos)
 477                         find_subpos(buf, sz, &subpos, &bodypos);
 478                 if (!subpos)
 479                         return;
 480
 481                 if (!strcmp(name, "subject"))
 482                         v->s = copy_line(subpos);
 483                 else if (!strcmp(name, "body"))
 484                         v->s = xstrdup(bodypos);
 485                 else if (!strcmp(name, "contents"))
 486                         v->s = xstrdup(subpos);
 487         }
 488 }
 489
 490 /* We want to have empty print-string for field requests
 491  * that do not apply (e.g. "authordate" for a tag object)
 492  */
 493 static void fill_missing_values(struct atom_value *val)
 494 {
 495         int i;
 496         for (i = 0; i < used_atom_cnt; i++) {
 497                 struct atom_value *v = &val[i];
 498                 if (v->s == NULL)
 499                         v->s = "";
 500         }
 501 }
 502
 503 /*
 504  * val is a list of atom_value to hold returned values.  Extract
 505  * the values for atoms in used_atom array out of (obj, buf, sz).
 506  * when deref is false, (obj, buf, sz) is the object that is
 507  * pointed at by the ref itself; otherwise it is the object the
 508  * ref (which is a tag) refers to.
 509  */
 510 static void grab_values(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 511 {
 512         grab_common_values(val, deref, obj, buf, sz);
 513         switch (obj->type) {
 514         case OBJ_TAG:
 515                 grab_tag_values(val, deref, obj, buf, sz);
 516                 grab_sub_body_contents(val, deref, obj, buf, sz);
 517                 grab_person("tagger", val, deref, obj, buf, sz);
 518                 break;
 519         case OBJ_COMMIT:
 520                 grab_commit_values(val, deref, obj, buf, sz);
 521                 grab_sub_body_contents(val, deref, obj, buf, sz);
 522                 grab_person("author", val, deref, obj, buf, sz);
 523                 grab_person("committer", val, deref, obj, buf, sz);
 524                 break;
 525         case OBJ_TREE:
 526                 // grab_tree_values(val, deref, obj, buf, sz);
 527                 break;
 528         case OBJ_BLOB:
 529                 // grab_blob_values(val, deref, obj, buf, sz);
 530                 break;
 531         default:
 532                 die("Eh?  Object of type %d?", obj->type);
 533         }
 534 }
 535
 536 /*
 537  * Parse the object referred by ref, and grab needed value.
 538  */
 539 static void populate_value(struct refinfo *ref)
 540 {
 541         void *buf;
 542         struct object *obj;
 543         int eaten, i;
 544         unsigned long size;
 545         const unsigned char *tagged;
 546
 547         ref->value = xcalloc(sizeof(struct atom_value), used_atom_cnt);
 548
 549         buf = get_obj(ref->objectname, &obj, &size, &eaten);
 550         if (!buf)
 551                 die("missing object %s for %s",
 552                     sha1_to_hex(ref->objectname), ref->refname);
 553         if (!obj)
 554                 die("parse_object_buffer failed on %s for %s",
 555                     sha1_to_hex(ref->objectname), ref->refname);
 556
 557         /* Fill in specials first */
 558         for (i = 0; i < used_atom_cnt; i++) {
 559                 const char *name = used_atom[i];
 560                 struct atom_value *v = &ref->value[i];
 561                 if (!strcmp(name, "refname"))
 562                         v->s = ref->refname;
 563                 else if (!strcmp(name, "*refname")) {
 564                         int len = strlen(ref->refname);
 565                         char *s = xmalloc(len + 4);
 566                         sprintf(s, "%s^{}", ref->refname);
 567                         v->s = s;
 568                 }
 569         }
 570
 571         grab_values(ref->value, 0, obj, buf, size);
 572         if (!eaten)
 573                 free(buf);
 574
 575         /* If there is no atom that wants to know about tagged
 576          * object, we are done.
 577          */
 578         if (!need_tagged || (obj->type != OBJ_TAG))
 579                 return;
 580
 581         /* If it is a tag object, see if we use a value that derefs
 582          * the object, and if we do grab the object it refers to.
 583          */
 584         tagged = ((struct tag *)obj)->tagged->sha1;
 585
 586         /* NEEDSWORK: This derefs tag only once, which
 587          * is good to deal with chains of trust, but
 588          * is not consistent with what deref_tag() does
 589          * which peels the onion to the core.
 590          */
 591         buf = get_obj(tagged, &obj, &size, &eaten);
 592         if (!buf)
 593                 die("missing object %s for %s",
 594                     sha1_to_hex(tagged), ref->refname);
 595         if (!obj)
 596                 die("parse_object_buffer failed on %s for %s",
 597                     sha1_to_hex(tagged), ref->refname);
 598         grab_values(ref->value, 1, obj, buf, size);
 599         if (!eaten)
 600                 free(buf);
 601 }
 602
 603 /*
 604  * Given a ref, return the value for the atom.  This lazily gets value
 605  * out of the object by calling populate value.
 606  */
 607 static void get_value(struct refinfo *ref, int atom, struct atom_value **v)
 608 {
 609         if (!ref->value) {
 610                 populate_value(ref);
 611                 fill_missing_values(ref->value);
 612         }
 613         *v = &ref->value[atom];
 614 }
 615
 616 struct grab_ref_cbdata {
 617         struct refinfo **grab_array;
 618         const char **grab_pattern;
 619         int grab_cnt;
 620 };
 621
 622 /*
 623  * A call-back given to for_each_ref().  It is unfortunate that we
 624  * need to use global variables to pass extra information to this
 625  * function.
 626  */
 627 static int grab_single_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 628 {
 629         struct grab_ref_cbdata *cb = cb_data;
 630         struct refinfo *ref;
 631         int cnt;
 632
 633         if (*cb->grab_pattern) {
 634                 const char **pattern;
 635                 int namelen = strlen(refname);
 636                 for (pattern = cb->grab_pattern; *pattern; pattern++) {
 637                         const char *p = *pattern;
 638                         int plen = strlen(p);
 639
 640                         if ((plen <= namelen) &&
 641                             !strncmp(refname, p, plen) &&
 642                             (refname[plen] == '\0' ||
 643                              refname[plen] == '/'))
 644                                 break;
 645                         if (!fnmatch(p, refname, FNM_PATHNAME))
 646                                 break;
 647                 }
 648                 if (!*pattern)
 649                         return 0;
 650         }
 651
 652         /* We do not open the object yet; sort may only need refname
 653          * to do its job and the resulting list may yet to be pruned
 654          * by maxcount logic.
 655          */
 656         ref = xcalloc(1, sizeof(*ref));
 657         ref->refname = xstrdup(refname);
 658         hashcpy(ref->objectname, sha1);
 659
 660         cnt = cb->grab_cnt;
 661         cb->grab_array = xrealloc(cb->grab_array,
 662                                   sizeof(*cb->grab_array) * (cnt + 1));
 663         cb->grab_array[cnt++] = ref;
 664         cb->grab_cnt = cnt;
 665         return 0;
 666 }
 667
 668 static int cmp_ref_sort(struct ref_sort *s, struct refinfo *a, struct refinfo *b)
 669 {
 670         struct atom_value *va, *vb;
 671         int cmp;
 672         cmp_type cmp_type = used_atom_type[s->atom];
 673
 674         get_value(a, s->atom, &va);
 675         get_value(b, s->atom, &vb);
 676         switch (cmp_type) {
 677         case FIELD_STR:
 678                 cmp = strcmp(va->s, vb->s);
 679                 break;
 680         default:
 681                 if (va->ul < vb->ul)
 682                         cmp = -1;
 683                 else if (va->ul == vb->ul)
 684                         cmp = 0;
 685                 else
 686                         cmp = 1;
 687                 break;
 688         }
 689         return (s->reverse) ? -cmp : cmp;
 690 }
 691
 692 static struct ref_sort *ref_sort;
 693 static int compare_refs(const void *a_, const void *b_)
 694 {
 695         struct refinfo *a = *((struct refinfo **)a_);
 696         struct refinfo *b = *((struct refinfo **)b_);
 697         struct ref_sort *s;
 698
 699         for (s = ref_sort; s; s = s->next) {
 700                 int cmp = cmp_ref_sort(s, a, b);
 701                 if (cmp)
 702                         return cmp;
 703         }
 704         return 0;
 705 }
 706
 707 static void sort_refs(struct ref_sort *sort, struct refinfo **refs, int num_refs)
 708 {
 709         ref_sort = sort;
 710         qsort(refs, num_refs, sizeof(struct refinfo *), compare_refs);
 711 }
 712
 713 static void print_value(struct refinfo *ref, int atom, int quote_style)
 714 {
 715         struct atom_value *v;
 716         get_value(ref, atom, &v);
 717         switch (quote_style) {
 718         case QUOTE_NONE:
 719                 fputs(v->s, stdout);
 720                 break;
 721         case QUOTE_SHELL:
 722                 sq_quote_print(stdout, v->s);
 723                 break;
 724         case QUOTE_PERL:
 725                 perl_quote_print(stdout, v->s);
 726                 break;
 727         case QUOTE_PYTHON:
 728                 python_quote_print(stdout, v->s);
 729                 break;
 730         case QUOTE_TCL:
 731                 tcl_quote_print(stdout, v->s);
 732                 break;
 733         }
 734 }
 735
 736 static int hex1(char ch)
 737 {
 738         if ('0' <= ch && ch <= '9')
 739                 return ch - '0';
 740         else if ('a' <= ch && ch <= 'f')
 741                 return ch - 'a' + 10;
 742         else if ('A' <= ch && ch <= 'F')
 743                 return ch - 'A' + 10;
 744         return -1;
 745 }
 746 static int hex2(const char *cp)
 747 {
 748         if (cp[0] && cp[1])
 749                 return (hex1(cp[0]) << 4) | hex1(cp[1]);
 750         else
 751                 return -1;
 752 }
 753
 754 static void emit(const char *cp, const char *ep)
 755 {
 756         while (*cp && (!ep || cp < ep)) {
 757                 if (*cp == '%') {
 758                         if (cp[1] == '%')
 759                                 cp++;
 760                         else {
 761                                 int ch = hex2(cp + 1);
 762                                 if (0 <= ch) {
 763                                         putchar(ch);
 764                                         cp += 3;
 765                                         continue;
 766                                 }
 767                         }
 768                 }
 769                 putchar(*cp);
 770                 cp++;
 771         }
 772 }
 773
 774 static void show_ref(struct refinfo *info, const char *format, int quote_style)
 775 {
 776         const char *cp, *sp, *ep;
 777
 778         for (cp = format; *cp && (sp = find_next(cp)); cp = ep + 1) {
 779                 ep = strchr(sp, ')');
 780                 if (cp < sp)
 781                         emit(cp, sp);
 782                 print_value(info, parse_atom(sp + 2, ep), quote_style);
 783         }
 784         if (*cp) {
 785                 sp = cp + strlen(cp);
 786                 emit(cp, sp);
 787         }
 788         putchar('\n');
 789 }
 790
 791 static struct ref_sort *default_sort(void)
 792 {
 793         static const char cstr_name[] = "refname";
 794
 795         struct ref_sort *sort = xcalloc(1, sizeof(*sort));
 796
 797         sort->next = NULL;
 798         sort->atom = parse_atom(cstr_name, cstr_name + strlen(cstr_name));
 799         return sort;
 800 }
 801
 802 int cmd_for_each_ref(int ac, const char **av, const char *prefix)
 803 {
 804         int i, num_refs;
 805         const char *format = NULL;
 806         struct ref_sort *sort = NULL, **sort_tail = &sort;
 807         int maxcount = 0;
 808         int quote_style = -1; /* unspecified yet */
 809         struct refinfo **refs;
 810         struct grab_ref_cbdata cbdata;
 811
 812         for (i = 1; i < ac; i++) {
 813                 const char *arg = av[i];
 814                 if (arg[0] != '-')
 815                         break;
 816                 if (!strcmp(arg, "--")) {
 817                         i++;
 818                         break;
 819                 }
 820                 if (!prefixcmp(arg, "--format=")) {
 821                         if (format)
 822                                 die("more than one --format?");
 823                         format = arg + 9;
 824                         continue;
 825                 }
 826                 if (!strcmp(arg, "-s") || !strcmp(arg, "--shell") ) {
 827                         if (0 <= quote_style)
 828                                 die("more than one quoting style?");
 829                         quote_style = QUOTE_SHELL;
 830                         continue;
 831                 }
 832                 if (!strcmp(arg, "-p") || !strcmp(arg, "--perl") ) {
 833                         if (0 <= quote_style)
 834                                 die("more than one quoting style?");
 835                         quote_style = QUOTE_PERL;
 836                         continue;
 837                 }
 838                 if (!strcmp(arg, "--python") ) {
 839                         if (0 <= quote_style)
 840                                 die("more than one quoting style?");
 841                         quote_style = QUOTE_PYTHON;
 842                         continue;
 843                 }
 844                 if (!strcmp(arg, "--tcl") ) {
 845                         if (0 <= quote_style)
 846                                 die("more than one quoting style?");
 847                         quote_style = QUOTE_TCL;
 848                         continue;
 849                 }
 850                 if (!prefixcmp(arg, "--count=")) {
 851                         if (maxcount)
 852                                 die("more than one --count?");
 853                         maxcount = atoi(arg + 8);
 854                         if (maxcount <= 0)
 855                                 die("The number %s did not parse", arg);
 856                         continue;
 857                 }
 858                 if (!prefixcmp(arg, "--sort=")) {
 859                         struct ref_sort *s = xcalloc(1, sizeof(*s));
 860                         int len;
 861
 862                         s->next = NULL;
 863                         *sort_tail = s;
 864                         sort_tail = &s->next;
 865
 866                         arg += 7;
 867                         if (*arg == '-') {
 868                                 s->reverse = 1;
 869                                 arg++;
 870                         }
 871                         len = strlen(arg);
 872                         sort->atom = parse_atom(arg, arg+len);
 873                         continue;
 874                 }
 875                 break;
 876         }
 877         if (quote_style < 0)
 878                 quote_style = QUOTE_NONE;
 879
 880         if (!sort)
 881                 sort = default_sort();
 882         sort_atom_limit = used_atom_cnt;
 883         if (!format)
 884                 format = "%(objectname) %(objecttype)\t%(refname)";
 885
 886         verify_format(format);
 887
 888         memset(&cbdata, 0, sizeof(cbdata));
 889         cbdata.grab_pattern = av + i;
 890         for_each_ref(grab_single_ref, &cbdata);
 891         refs = cbdata.grab_array;
 892         num_refs = cbdata.grab_cnt;
 893
 894         for (i = 0; i < used_atom_cnt; i++) {
 895                 if (used_atom[i][0] == '*') {
 896                         need_tagged = 1;
 897                         break;
 898                 }
 899         }
 900
 901         sort_refs(sort, refs, num_refs);
 902
 903         if (!maxcount || num_refs < maxcount)
 904                 maxcount = num_refs;
 905         for (i = 0; i < maxcount; i++)
 906                 show_ref(refs[i], format, quote_style);
 907         return 0;
 908 }