builtin-for-each-ref.c

   1 #include "cache.h"
   2 #include "refs.h"
   3 #include "object.h"
   4 #include "tag.h"
   5 #include "commit.h"
   6 #include "tree.h"
   7 #include "blob.h"
   8 #include "quote.h"
   9
  10 /* Quoting styles */
  11 #define QUOTE_NONE 0
  12 #define QUOTE_SHELL 1
  13 #define QUOTE_PERL 2
  14 #define QUOTE_PYTHON 3
  15
  16 typedef enum { FIELD_STR, FIELD_ULONG, FIELD_TIME } cmp_type;
  17
  18 struct atom_value {
  19         const char *s;
  20         unsigned long ul; /* used for sorting when not FIELD_STR */
  21 };
  22
  23 struct ref_sort {
  24         struct ref_sort *next;
  25         int atom; /* index into used_atom array */
  26         unsigned reverse : 1;
  27 };
  28
  29 struct refinfo {
  30         char *refname;
  31         unsigned char objectname[20];
  32         struct atom_value *value;
  33 };
  34
  35 static struct {
  36         const char *name;
  37         cmp_type cmp_type;
  38 } valid_atom[] = {
  39         { "refname" },
  40         { "objecttype" },
  41         { "objectsize", FIELD_ULONG },
  42         { "objectname" },
  43         { "tree" },
  44         { "parent" }, /* NEEDSWORK: how to address 2nd and later parents? */
  45         { "numparent", FIELD_ULONG },
  46         { "object" },
  47         { "type" },
  48         { "tag" },
  49         { "author" },
  50         { "authorname" },
  51         { "authoremail" },
  52         { "authordate", FIELD_TIME },
  53         { "committer" },
  54         { "committername" },
  55         { "committeremail" },
  56         { "committerdate", FIELD_TIME },
  57         { "tagger" },
  58         { "taggername" },
  59         { "taggeremail" },
  60         { "taggerdate", FIELD_TIME },
  61         { "creator" },
  62         { "creatordate", FIELD_TIME },
  63         { "subject" },
  64         { "body" },
  65         { "contents" },
  66 };
  67
  68 /*
  69  * An atom is a valid field atom listed above, possibly prefixed with
  70  * a "*" to denote deref_tag().
  71  *
  72  * We parse given format string and sort specifiers, and make a list
  73  * of properties that we need to extract out of objects.  refinfo
  74  * structure will hold an array of values extracted that can be
  75  * indexed with the "atom number", which is an index into this
  76  * array.
  77  */
  78 static const char **used_atom;
  79 static cmp_type *used_atom_type;
  80 static int used_atom_cnt, sort_atom_limit, need_tagged;
  81
  82 /*
  83  * Used to parse format string and sort specifiers
  84  */
  85 static int parse_atom(const char *atom, const char *ep)
  86 {
  87         const char *sp;
  88         char *n;
  89         int i, at;
  90
  91         sp = atom;
  92         if (*sp == '*' && sp < ep)
  93                 sp++; /* deref */
  94         if (ep <= sp)
  95                 die("malformed field name: %.*s", (int)(ep-atom), atom);
  96
  97         /* Do we have the atom already used elsewhere? */
  98         for (i = 0; i < used_atom_cnt; i++) {
  99                 int len = strlen(used_atom[i]);
 100                 if (len == ep - atom && !memcmp(used_atom[i], atom, len))
 101                         return i;
 102         }
 103
 104         /* Is the atom a valid one? */
 105         for (i = 0; i < ARRAY_SIZE(valid_atom); i++) {
 106                 int len = strlen(valid_atom[i].name);
 107                 if (len == ep - sp && !memcmp(valid_atom[i].name, sp, len))
 108                         break;
 109         }
 110
 111         if (ARRAY_SIZE(valid_atom) <= i)
 112                 die("unknown field name: %.*s", (int)(ep-atom), atom);
 113
 114         /* Add it in, including the deref prefix */
 115         at = used_atom_cnt;
 116         used_atom_cnt++;
 117         used_atom = xrealloc(used_atom,
 118                              (sizeof *used_atom) * used_atom_cnt);
 119         used_atom_type = xrealloc(used_atom_type,
 120                                   (sizeof(*used_atom_type) * used_atom_cnt));
 121         n = xmalloc(ep - atom + 1);
 122         memcpy(n, atom, ep - atom);
 123         n[ep-atom] = 0;
 124         used_atom[at] = n;
 125         used_atom_type[at] = valid_atom[i].cmp_type;
 126         return at;
 127 }
 128
 129 /*
 130  * In a format string, find the next occurrence of %(atom).
 131  */
 132 static const char *find_next(const char *cp)
 133 {
 134         while (*cp) {
 135                 if (*cp == '%') {
 136                         /* %( is the start of an atom;
 137                          * %% is a quoteed per-cent.
 138                          */
 139                         if (cp[1] == '(')
 140                                 return cp;
 141                         else if (cp[1] == '%')
 142                                 cp++; /* skip over two % */
 143                         /* otherwise this is a singleton, literal % */
 144                 }
 145                 cp++;
 146         }
 147         return NULL;
 148 }
 149
 150 /*
 151  * Make sure the format string is well formed, and parse out
 152  * the used atoms.
 153  */
 154 static void verify_format(const char *format)
 155 {
 156         const char *cp, *sp;
 157         for (cp = format; *cp && (sp = find_next(cp)); ) {
 158                 const char *ep = strchr(sp, ')');
 159                 if (!ep)
 160                         die("malformatted format string %s", sp);
 161                 /* sp points at "%(" and ep points at the closing ")" */
 162                 parse_atom(sp + 2, ep);
 163                 cp = ep + 1;
 164         }
 165 }
 166
 167 /*
 168  * Given an object name, read the object data and size, and return a
 169  * "struct object".  If the object data we are returning is also borrowed
 170  * by the "struct object" representation, set *eaten as well---it is a
 171  * signal from parse_object_buffer to us not to free the buffer.
 172  */
 173 static void *get_obj(const unsigned char *sha1, struct object **obj, unsigned long *sz, int *eaten)
 174 {
 175         char type[20];
 176         void *buf = read_sha1_file(sha1, type, sz);
 177
 178         if (buf)
 179                 *obj = parse_object_buffer(sha1, type, *sz, buf, eaten);
 180         else
 181                 *obj = NULL;
 182         return buf;
 183 }
 184
 185 /* See grab_values */
 186 static void grab_common_values(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 187 {
 188         int i;
 189
 190         for (i = 0; i < used_atom_cnt; i++) {
 191                 const char *name = used_atom[i];
 192                 struct atom_value *v = &val[i];
 193                 if (!!deref != (*name == '*'))
 194                         continue;
 195                 if (deref)
 196                         name++;
 197                 if (!strcmp(name, "objecttype"))
 198                         v->s = type_names[obj->type];
 199                 else if (!strcmp(name, "objectsize")) {
 200                         char *s = xmalloc(40);
 201                         sprintf(s, "%lu", sz);
 202                         v->ul = sz;
 203                         v->s = s;
 204                 }
 205                 else if (!strcmp(name, "objectname")) {
 206                         char *s = xmalloc(41);
 207                         strcpy(s, sha1_to_hex(obj->sha1));
 208                         v->s = s;
 209                 }
 210         }
 211 }
 212
 213 /* See grab_values */
 214 static void grab_tag_values(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 215 {
 216         int i;
 217         struct tag *tag = (struct tag *) obj;
 218
 219         for (i = 0; i < used_atom_cnt; i++) {
 220                 const char *name = used_atom[i];
 221                 struct atom_value *v = &val[i];
 222                 if (!!deref != (*name == '*'))
 223                         continue;
 224                 if (deref)
 225                         name++;
 226                 if (!strcmp(name, "tag"))
 227                         v->s = tag->tag;
 228         }
 229 }
 230
 231 static int num_parents(struct commit *commit)
 232 {
 233         struct commit_list *parents;
 234         int i;
 235
 236         for (i = 0, parents = commit->parents;
 237              parents;
 238              parents = parents->next)
 239                 i++;
 240         return i;
 241 }
 242
 243 /* See grab_values */
 244 static void grab_commit_values(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 245 {
 246         int i;
 247         struct commit *commit = (struct commit *) obj;
 248
 249         for (i = 0; i < used_atom_cnt; i++) {
 250                 const char *name = used_atom[i];
 251                 struct atom_value *v = &val[i];
 252                 if (!!deref != (*name == '*'))
 253                         continue;
 254                 if (deref)
 255                         name++;
 256                 if (!strcmp(name, "tree")) {
 257                         char *s = xmalloc(41);
 258                         strcpy(s, sha1_to_hex(commit->tree->object.sha1));
 259                         v->s = s;
 260                 }
 261                 if (!strcmp(name, "numparent")) {
 262                         char *s = xmalloc(40);
 263                         sprintf(s, "%lu", v->ul);
 264                         v->s = s;
 265                         v->ul = num_parents(commit);
 266                 }
 267                 else if (!strcmp(name, "parent")) {
 268                         int num = num_parents(commit);
 269                         int i;
 270                         struct commit_list *parents;
 271                         char *s = xmalloc(42 * num);
 272                         v->s = s;
 273                         for (i = 0, parents = commit->parents;
 274                              parents;
 275                              parents = parents->next, i = i + 42) {
 276                                 struct commit *parent = parents->item;
 277                                 strcpy(s+i, sha1_to_hex(parent->object.sha1));
 278                                 if (parents->next)
 279                                         s[i+40] = ' ';
 280                         }
 281                 }
 282         }
 283 }
 284
 285 static const char *find_wholine(const char *who, int wholen, const char *buf, unsigned long sz)
 286 {
 287         const char *eol;
 288         while (*buf) {
 289                 if (!strncmp(buf, who, wholen) &&
 290                     buf[wholen] == ' ')
 291                         return buf + wholen + 1;
 292                 eol = strchr(buf, '\n');
 293                 if (!eol)
 294                         return "";
 295                 eol++;
 296                 if (eol[1] == '\n')
 297                         return ""; /* end of header */
 298                 buf = eol;
 299         }
 300         return "";
 301 }
 302
 303 static char *copy_line(const char *buf)
 304 {
 305         const char *eol = strchr(buf, '\n');
 306         char *line;
 307         int len;
 308         if (!eol)
 309                 return "";
 310         len = eol - buf;
 311         line = xmalloc(len + 1);
 312         memcpy(line, buf, len);
 313         line[len] = 0;
 314         return line;
 315 }
 316
 317 static char *copy_name(const char *buf)
 318 {
 319         const char *eol = strchr(buf, '\n');
 320         const char *eoname = strstr(buf, " <");
 321         char *line;
 322         int len;
 323         if (!(eoname && eol && eoname < eol))
 324                 return "";
 325         len = eoname - buf;
 326         line = xmalloc(len + 1);
 327         memcpy(line, buf, len);
 328         line[len] = 0;
 329         return line;
 330 }
 331
 332 static char *copy_email(const char *buf)
 333 {
 334         const char *email = strchr(buf, '<');
 335         const char *eoemail = strchr(email, '>');
 336         char *line;
 337         int len;
 338         if (!email || !eoemail)
 339                 return "";
 340         eoemail++;
 341         len = eoemail - email;
 342         line = xmalloc(len + 1);
 343         memcpy(line, email, len);
 344         line[len] = 0;
 345         return line;
 346 }
 347
 348 static void grab_date(const char *buf, struct atom_value *v)
 349 {
 350         const char *eoemail = strstr(buf, "> ");
 351         char *zone;
 352         unsigned long timestamp;
 353         long tz;
 354
 355         if (!eoemail)
 356                 goto bad;
 357         timestamp = strtoul(eoemail + 2, &zone, 10);
 358         if (timestamp == ULONG_MAX)
 359                 goto bad;
 360         tz = strtol(zone, NULL, 10);
 361         if ((tz == LONG_MIN || tz == LONG_MAX) && errno == ERANGE)
 362                 goto bad;
 363         v->s = xstrdup(show_date(timestamp, tz, 0));
 364         v->ul = timestamp;
 365         return;
 366  bad:
 367         v->s = "";
 368         v->ul = 0;
 369 }
 370
 371 /* See grab_values */
 372 static void grab_person(const char *who, struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 373 {
 374         int i;
 375         int wholen = strlen(who);
 376         const char *wholine = NULL;
 377
 378         for (i = 0; i < used_atom_cnt; i++) {
 379                 const char *name = used_atom[i];
 380                 struct atom_value *v = &val[i];
 381                 if (!!deref != (*name == '*'))
 382                         continue;
 383                 if (deref)
 384                         name++;
 385                 if (strncmp(who, name, wholen))
 386                         continue;
 387                 if (name[wholen] != 0 &&
 388                     strcmp(name + wholen, "name") &&
 389                     strcmp(name + wholen, "email") &&
 390                     strcmp(name + wholen, "date"))
 391                         continue;
 392                 if (!wholine)
 393                         wholine = find_wholine(who, wholen, buf, sz);
 394                 if (!wholine)
 395                         return; /* no point looking for it */
 396                 if (name[wholen] == 0)
 397                         v->s = copy_line(wholine);
 398                 else if (!strcmp(name + wholen, "name"))
 399                         v->s = copy_name(wholine);
 400                 else if (!strcmp(name + wholen, "email"))
 401                         v->s = copy_email(wholine);
 402                 else if (!strcmp(name + wholen, "date"))
 403                         grab_date(wholine, v);
 404         }
 405
 406         /* For a tag or a commit object, if "creator" or "creatordate" is
 407          * requested, do something special.
 408          */
 409         if (strcmp(who, "tagger") && strcmp(who, "committer"))
 410                 return; /* "author" for commit object is not wanted */
 411         if (!wholine)
 412                 wholine = find_wholine(who, wholen, buf, sz);
 413         if (!wholine)
 414                 return;
 415         for (i = 0; i < used_atom_cnt; i++) {
 416                 const char *name = used_atom[i];
 417                 struct atom_value *v = &val[i];
 418                 if (!!deref != (*name == '*'))
 419                         continue;
 420                 if (deref)
 421                         name++;
 422
 423                 if (!strcmp(name, "creatordate"))
 424                         grab_date(wholine, v);
 425                 else if (!strcmp(name, "creator"))
 426                         v->s = copy_line(wholine);
 427         }
 428 }
 429
 430 static void find_subpos(const char *buf, unsigned long sz, const char **sub, const char **body)
 431 {
 432         while (*buf) {
 433                 const char *eol = strchr(buf, '\n');
 434                 if (!eol)
 435                         return;
 436                 if (eol[1] == '\n') {
 437                         buf = eol + 1;
 438                         break; /* found end of header */
 439                 }
 440                 buf = eol + 1;
 441         }
 442         while (*buf == '\n')
 443                 buf++;
 444         if (!*buf)
 445                 return;
 446         *sub = buf; /* first non-empty line */
 447         buf = strchr(buf, '\n');
 448         if (!buf)
 449                 return; /* no body */
 450         while (*buf == '\n')
 451                 buf++; /* skip blank between subject and body */
 452         *body = buf;
 453 }
 454
 455 /* See grab_values */
 456 static void grab_sub_body_contents(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 457 {
 458         int i;
 459         const char *subpos = NULL, *bodypos = NULL;
 460
 461         for (i = 0; i < used_atom_cnt; i++) {
 462                 const char *name = used_atom[i];
 463                 struct atom_value *v = &val[i];
 464                 if (!!deref != (*name == '*'))
 465                         continue;
 466                 if (deref)
 467                         name++;
 468                 if (strcmp(name, "subject") &&
 469                     strcmp(name, "body") &&
 470                     strcmp(name, "contents"))
 471                         continue;
 472                 if (!subpos)
 473                         find_subpos(buf, sz, &subpos, &bodypos);
 474                 if (!subpos)
 475                         return;
 476
 477                 if (!strcmp(name, "subject"))
 478                         v->s = copy_line(subpos);
 479                 else if (!strcmp(name, "body"))
 480                         v->s = xstrdup(bodypos);
 481                 else if (!strcmp(name, "contents"))
 482                         v->s = xstrdup(subpos);
 483         }
 484 }
 485
 486 /* We want to have empty print-string for field requests
 487  * that do not apply (e.g. "authordate" for a tag object)
 488  */
 489 static void fill_missing_values(struct atom_value *val)
 490 {
 491         int i;
 492         for (i = 0; i < used_atom_cnt; i++) {
 493                 struct atom_value *v = &val[i];
 494                 if (v->s == NULL)
 495                         v->s = "";
 496         }
 497 }
 498
 499 /*
 500  * val is a list of atom_value to hold returned values.  Extract
 501  * the values for atoms in used_atom array out of (obj, buf, sz).
 502  * when deref is false, (obj, buf, sz) is the object that is
 503  * pointed at by the ref itself; otherwise it is the object the
 504  * ref (which is a tag) refers to.
 505  */
 506 static void grab_values(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 507 {
 508         grab_common_values(val, deref, obj, buf, sz);
 509         switch (obj->type) {
 510         case OBJ_TAG:
 511                 grab_tag_values(val, deref, obj, buf, sz);
 512                 grab_sub_body_contents(val, deref, obj, buf, sz);
 513                 grab_person("tagger", val, deref, obj, buf, sz);
 514                 break;
 515         case OBJ_COMMIT:
 516                 grab_commit_values(val, deref, obj, buf, sz);
 517                 grab_sub_body_contents(val, deref, obj, buf, sz);
 518                 grab_person("author", val, deref, obj, buf, sz);
 519                 grab_person("committer", val, deref, obj, buf, sz);
 520                 break;
 521         case OBJ_TREE:
 522                 // grab_tree_values(val, deref, obj, buf, sz);
 523                 break;
 524         case OBJ_BLOB:
 525                 // grab_blob_values(val, deref, obj, buf, sz);
 526                 break;
 527         default:
 528                 die("Eh?  Object of type %d?", obj->type);
 529         }
 530 }
 531
 532 /*
 533  * Parse the object referred by ref, and grab needed value.
 534  */
 535 static void populate_value(struct refinfo *ref)
 536 {
 537         void *buf;
 538         struct object *obj;
 539         int eaten, i;
 540         unsigned long size;
 541         const unsigned char *tagged;
 542
 543         ref->value = xcalloc(sizeof(struct atom_value), used_atom_cnt);
 544
 545         buf = get_obj(ref->objectname, &obj, &size, &eaten);
 546         if (!buf)
 547                 die("missing object %s for %s",
 548                     sha1_to_hex(ref->objectname), ref->refname);
 549         if (!obj)
 550                 die("parse_object_buffer failed on %s for %s",
 551                     sha1_to_hex(ref->objectname), ref->refname);
 552
 553         /* Fill in specials first */
 554         for (i = 0; i < used_atom_cnt; i++) {
 555                 const char *name = used_atom[i];
 556                 struct atom_value *v = &ref->value[i];
 557                 if (!strcmp(name, "refname"))
 558                         v->s = ref->refname;
 559                 else if (!strcmp(name, "*refname")) {
 560                         int len = strlen(ref->refname);
 561                         char *s = xmalloc(len + 4);
 562                         sprintf(s, "%s^{}", ref->refname);
 563                         v->s = s;
 564                 }
 565         }
 566
 567         grab_values(ref->value, 0, obj, buf, size);
 568         if (!eaten)
 569                 free(buf);
 570
 571         /* If there is no atom that wants to know about tagged
 572          * object, we are done.
 573          */
 574         if (!need_tagged || (obj->type != OBJ_TAG))
 575                 return;
 576
 577         /* If it is a tag object, see if we use a value that derefs
 578          * the object, and if we do grab the object it refers to.
 579          */
 580         tagged = ((struct tag *)obj)->tagged->sha1;
 581
 582         /* NEEDSWORK: This derefs tag only once, which
 583          * is good to deal with chains of trust, but
 584          * is not consistent with what deref_tag() does
 585          * which peels the onion to the core.
 586          */
 587         buf = get_obj(tagged, &obj, &size, &eaten);
 588         if (!buf)
 589                 die("missing object %s for %s",
 590                     sha1_to_hex(tagged), ref->refname);
 591         if (!obj)
 592                 die("parse_object_buffer failed on %s for %s",
 593                     sha1_to_hex(tagged), ref->refname);
 594         grab_values(ref->value, 1, obj, buf, size);
 595         if (!eaten)
 596                 free(buf);
 597 }
 598
 599 /*
 600  * Given a ref, return the value for the atom.  This lazily gets value
 601  * out of the object by calling populate value.
 602  */
 603 static void get_value(struct refinfo *ref, int atom, struct atom_value **v)
 604 {
 605         if (!ref->value) {
 606                 populate_value(ref);
 607                 fill_missing_values(ref->value);
 608         }
 609         *v = &ref->value[atom];
 610 }
 611
 612 struct grab_ref_cbdata {
 613         struct refinfo **grab_array;
 614         const char **grab_pattern;
 615         int grab_cnt;
 616 };
 617
 618 /*
 619  * A call-back given to for_each_ref().  It is unfortunate that we
 620  * need to use global variables to pass extra information to this
 621  * function.
 622  */
 623 static int grab_single_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 624 {
 625         struct grab_ref_cbdata *cb = cb_data;
 626         struct refinfo *ref;
 627         int cnt;
 628
 629         if (*cb->grab_pattern) {
 630                 const char **pattern;
 631                 int namelen = strlen(refname);
 632                 for (pattern = cb->grab_pattern; *pattern; pattern++) {
 633                         const char *p = *pattern;
 634                         int plen = strlen(p);
 635
 636                         if ((plen <= namelen) &&
 637                             !strncmp(refname, p, plen) &&
 638                             (refname[plen] == '\0' ||
 639                              refname[plen] == '/'))
 640                                 break;
 641                         if (!fnmatch(p, refname, FNM_PATHNAME))
 642                                 break;
 643                 }
 644                 if (!*pattern)
 645                         return 0;
 646         }
 647
 648         /* We do not open the object yet; sort may only need refname
 649          * to do its job and the resulting list may yet to be pruned
 650          * by maxcount logic.
 651          */
 652         ref = xcalloc(1, sizeof(*ref));
 653         ref->refname = xstrdup(refname);
 654         hashcpy(ref->objectname, sha1);
 655
 656         cnt = cb->grab_cnt;
 657         cb->grab_array = xrealloc(cb->grab_array,
 658                                   sizeof(*cb->grab_array) * (cnt + 1));
 659         cb->grab_array[cnt++] = ref;
 660         cb->grab_cnt = cnt;
 661         return 0;
 662 }
 663
 664 static int cmp_ref_sort(struct ref_sort *s, struct refinfo *a, struct refinfo *b)
 665 {
 666         struct atom_value *va, *vb;
 667         int cmp;
 668         cmp_type cmp_type = used_atom_type[s->atom];
 669
 670         get_value(a, s->atom, &va);
 671         get_value(b, s->atom, &vb);
 672         switch (cmp_type) {
 673         case FIELD_STR:
 674                 cmp = strcmp(va->s, vb->s);
 675                 break;
 676         default:
 677                 if (va->ul < vb->ul)
 678                         cmp = -1;
 679                 else if (va->ul == vb->ul)
 680                         cmp = 0;
 681                 else
 682                         cmp = 1;
 683                 break;
 684         }
 685         return (s->reverse) ? -cmp : cmp;
 686 }
 687
 688 static struct ref_sort *ref_sort;
 689 static int compare_refs(const void *a_, const void *b_)
 690 {
 691         struct refinfo *a = *((struct refinfo **)a_);
 692         struct refinfo *b = *((struct refinfo **)b_);
 693         struct ref_sort *s;
 694
 695         for (s = ref_sort; s; s = s->next) {
 696                 int cmp = cmp_ref_sort(s, a, b);
 697                 if (cmp)
 698                         return cmp;
 699         }
 700         return 0;
 701 }
 702
 703 static void sort_refs(struct ref_sort *sort, struct refinfo **refs, int num_refs)
 704 {
 705         ref_sort = sort;
 706         qsort(refs, num_refs, sizeof(struct refinfo *), compare_refs);
 707 }
 708
 709 static void print_value(struct refinfo *ref, int atom, int quote_style)
 710 {
 711         struct atom_value *v;
 712         get_value(ref, atom, &v);
 713         switch (quote_style) {
 714         case QUOTE_NONE:
 715                 fputs(v->s, stdout);
 716                 break;
 717         case QUOTE_SHELL:
 718                 sq_quote_print(stdout, v->s);
 719                 break;
 720         case QUOTE_PERL:
 721                 perl_quote_print(stdout, v->s);
 722                 break;
 723         case QUOTE_PYTHON:
 724                 python_quote_print(stdout, v->s);
 725                 break;
 726         }
 727 }
 728
 729 static int hex1(char ch)
 730 {
 731         if ('0' <= ch && ch <= '9')
 732                 return ch - '0';
 733         else if ('a' <= ch && ch <= 'f')
 734                 return ch - 'a' + 10;
 735         else if ('A' <= ch && ch <= 'F')
 736                 return ch - 'A' + 10;
 737         return -1;
 738 }
 739 static int hex2(const char *cp)
 740 {
 741         if (cp[0] && cp[1])
 742                 return (hex1(cp[0]) << 4) | hex1(cp[1]);
 743         else
 744                 return -1;
 745 }
 746
 747 static void emit(const char *cp, const char *ep)
 748 {
 749         while (*cp && (!ep || cp < ep)) {
 750                 if (*cp == '%') {
 751                         if (cp[1] == '%')
 752                                 cp++;
 753                         else {
 754                                 int ch = hex2(cp + 1);
 755                                 if (0 <= ch) {
 756                                         putchar(ch);
 757                                         cp += 3;
 758                                         continue;
 759                                 }
 760                         }
 761                 }
 762                 putchar(*cp);
 763                 cp++;
 764         }
 765 }
 766
 767 static void show_ref(struct refinfo *info, const char *format, int quote_style)
 768 {
 769         const char *cp, *sp, *ep;
 770
 771         for (cp = format; *cp && (sp = find_next(cp)); cp = ep + 1) {
 772                 ep = strchr(sp, ')');
 773                 if (cp < sp)
 774                         emit(cp, sp);
 775                 print_value(info, parse_atom(sp + 2, ep), quote_style);
 776         }
 777         if (*cp) {
 778                 sp = cp + strlen(cp);
 779                 emit(cp, sp);
 780         }
 781         putchar('\n');
 782 }
 783
 784 static struct ref_sort *default_sort(void)
 785 {
 786         static const char cstr_name[] = "refname";
 787
 788         struct ref_sort *sort = xcalloc(1, sizeof(*sort));
 789
 790         sort->next = NULL;
 791         sort->atom = parse_atom(cstr_name, cstr_name + strlen(cstr_name));
 792         return sort;
 793 }
 794
 795 int cmd_for_each_ref(int ac, const char **av, char *prefix)
 796 {
 797         int i, num_refs;
 798         const char *format = NULL;
 799         struct ref_sort *sort = NULL, **sort_tail = &sort;
 800         int maxcount = 0;
 801         int quote_style = -1; /* unspecified yet */
 802         struct refinfo **refs;
 803         struct grab_ref_cbdata cbdata;
 804
 805         for (i = 1; i < ac; i++) {
 806                 const char *arg = av[i];
 807                 if (arg[0] != '-')
 808                         break;
 809                 if (!strcmp(arg, "--")) {
 810                         i++;
 811                         break;
 812                 }
 813                 if (!strncmp(arg, "--format=", 9)) {
 814                         if (format)
 815                                 die("more than one --format?");
 816                         format = arg + 9;
 817                         continue;
 818                 }
 819                 if (!strcmp(arg, "-s") || !strcmp(arg, "--shell") ) {
 820                         if (0 <= quote_style)
 821                                 die("more than one quoting style?");
 822                         quote_style = QUOTE_SHELL;
 823                         continue;
 824                 }
 825                 if (!strcmp(arg, "-p") || !strcmp(arg, "--perl") ) {
 826                         if (0 <= quote_style)
 827                                 die("more than one quoting style?");
 828                         quote_style = QUOTE_PERL;
 829                         continue;
 830                 }
 831                 if (!strcmp(arg, "--python") ) {
 832                         if (0 <= quote_style)
 833                                 die("more than one quoting style?");
 834                         quote_style = QUOTE_PYTHON;
 835                         continue;
 836                 }
 837                 if (!strncmp(arg, "--count=", 8)) {
 838                         if (maxcount)
 839                                 die("more than one --count?");
 840                         maxcount = atoi(arg + 8);
 841                         if (maxcount <= 0)
 842                                 die("The number %s did not parse", arg);
 843                         continue;
 844                 }
 845                 if (!strncmp(arg, "--sort=", 7)) {
 846                         struct ref_sort *s = xcalloc(1, sizeof(*s));
 847                         int len;
 848
 849                         s->next = NULL;
 850                         *sort_tail = s;
 851                         sort_tail = &s->next;
 852
 853                         arg += 7;
 854                         if (*arg == '-') {
 855                                 s->reverse = 1;
 856                                 arg++;
 857                         }
 858                         len = strlen(arg);
 859                         sort->atom = parse_atom(arg, arg+len);
 860                         continue;
 861                 }
 862                 break;
 863         }
 864         if (quote_style < 0)
 865                 quote_style = QUOTE_NONE;
 866
 867         if (!sort)
 868                 sort = default_sort();
 869         sort_atom_limit = used_atom_cnt;
 870         if (!format)
 871                 format = "%(objectname) %(objecttype)\t%(refname)";
 872
 873         verify_format(format);
 874
 875         memset(&cbdata, 0, sizeof(cbdata));
 876         cbdata.grab_pattern = av + i;
 877         for_each_ref(grab_single_ref, &cbdata);
 878         refs = cbdata.grab_array;
 879         num_refs = cbdata.grab_cnt;
 880
 881         for (i = 0; i < used_atom_cnt; i++) {
 882                 if (used_atom[i][0] == '*') {
 883                         need_tagged = 1;
 884                         break;
 885                 }
 886         }
 887
 888         sort_refs(sort, refs, num_refs);
 889
 890         if (!maxcount || num_refs < maxcount)
 891                 maxcount = num_refs;
 892         for (i = 0; i < maxcount; i++)
 893                 show_ref(refs[i], format, quote_style);
 894         return 0;
 895 }