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         int i, at;
  91
  92         sp = atom;
  93         if (*sp == '*' && sp < ep)
  94                 sp++; /* deref */
  95         if (ep <= sp)
  96                 die("malformed field name: %.*s", (int)(ep-atom), atom);
  97
  98         /* Do we have the atom already used elsewhere? */
  99         for (i = 0; i < used_atom_cnt; i++) {
 100                 int len = strlen(used_atom[i]);
 101                 if (len == ep - atom && !memcmp(used_atom[i], atom, len))
 102                         return i;
 103         }
 104
 105         /* Is the atom a valid one? */
 106         for (i = 0; i < ARRAY_SIZE(valid_atom); i++) {
 107                 int len = strlen(valid_atom[i].name);
 108                 /*
 109                  * If the atom name has a colon, strip it and everything after
 110                  * it off - it specifies the format for this entry, and
 111                  * shouldn't be used for checking against the valid_atom
 112                  * table.
 113                  */
 114                 const char *formatp = strchr(sp, ':');
 115                 if (!formatp || ep < formatp)
 116                         formatp = ep;
 117                 if (len == formatp - sp && !memcmp(valid_atom[i].name, sp, len))
 118                         break;
 119         }
 120
 121         if (ARRAY_SIZE(valid_atom) <= i)
 122                 die("unknown field name: %.*s", (int)(ep-atom), atom);
 123
 124         /* Add it in, including the deref prefix */
 125         at = used_atom_cnt;
 126         used_atom_cnt++;
 127         used_atom = xrealloc(used_atom,
 128                              (sizeof *used_atom) * used_atom_cnt);
 129         used_atom_type = xrealloc(used_atom_type,
 130                                   (sizeof(*used_atom_type) * used_atom_cnt));
 131         used_atom[at] = xmemdupz(atom, ep - atom);
 132         used_atom_type[at] = valid_atom[i].cmp_type;
 133         return at;
 134 }
 135
 136 /*
 137  * In a format string, find the next occurrence of %(atom).
 138  */
 139 static const char *find_next(const char *cp)
 140 {
 141         while (*cp) {
 142                 if (*cp == '%') {
 143                         /* %( is the start of an atom;
 144                          * %% is a quoted per-cent.
 145                          */
 146                         if (cp[1] == '(')
 147                                 return cp;
 148                         else if (cp[1] == '%')
 149                                 cp++; /* skip over two % */
 150                         /* otherwise this is a singleton, literal % */
 151                 }
 152                 cp++;
 153         }
 154         return NULL;
 155 }
 156
 157 /*
 158  * Make sure the format string is well formed, and parse out
 159  * the used atoms.
 160  */
 161 static void verify_format(const char *format)
 162 {
 163         const char *cp, *sp;
 164         for (cp = format; *cp && (sp = find_next(cp)); ) {
 165                 const char *ep = strchr(sp, ')');
 166                 if (!ep)
 167                         die("malformatted format string %s", sp);
 168                 /* sp points at "%(" and ep points at the closing ")" */
 169                 parse_atom(sp + 2, ep);
 170                 cp = ep + 1;
 171         }
 172 }
 173
 174 /*
 175  * Given an object name, read the object data and size, and return a
 176  * "struct object".  If the object data we are returning is also borrowed
 177  * by the "struct object" representation, set *eaten as well---it is a
 178  * signal from parse_object_buffer to us not to free the buffer.
 179  */
 180 static void *get_obj(const unsigned char *sha1, struct object **obj, unsigned long *sz, int *eaten)
 181 {
 182         enum object_type type;
 183         void *buf = read_sha1_file(sha1, &type, sz);
 184
 185         if (buf)
 186                 *obj = parse_object_buffer(sha1, type, *sz, buf, eaten);
 187         else
 188                 *obj = NULL;
 189         return buf;
 190 }
 191
 192 /* See grab_values */
 193 static void grab_common_values(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 194 {
 195         int i;
 196
 197         for (i = 0; i < used_atom_cnt; i++) {
 198                 const char *name = used_atom[i];
 199                 struct atom_value *v = &val[i];
 200                 if (!!deref != (*name == '*'))
 201                         continue;
 202                 if (deref)
 203                         name++;
 204                 if (!strcmp(name, "objecttype"))
 205                         v->s = typename(obj->type);
 206                 else if (!strcmp(name, "objectsize")) {
 207                         char *s = xmalloc(40);
 208                         sprintf(s, "%lu", sz);
 209                         v->ul = sz;
 210                         v->s = s;
 211                 }
 212                 else if (!strcmp(name, "objectname")) {
 213                         char *s = xmalloc(41);
 214                         strcpy(s, sha1_to_hex(obj->sha1));
 215                         v->s = s;
 216                 }
 217         }
 218 }
 219
 220 /* See grab_values */
 221 static void grab_tag_values(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 222 {
 223         int i;
 224         struct tag *tag = (struct tag *) obj;
 225
 226         for (i = 0; i < used_atom_cnt; i++) {
 227                 const char *name = used_atom[i];
 228                 struct atom_value *v = &val[i];
 229                 if (!!deref != (*name == '*'))
 230                         continue;
 231                 if (deref)
 232                         name++;
 233                 if (!strcmp(name, "tag"))
 234                         v->s = tag->tag;
 235         }
 236 }
 237
 238 static int num_parents(struct commit *commit)
 239 {
 240         struct commit_list *parents;
 241         int i;
 242
 243         for (i = 0, parents = commit->parents;
 244              parents;
 245              parents = parents->next)
 246                 i++;
 247         return i;
 248 }
 249
 250 /* See grab_values */
 251 static void grab_commit_values(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 252 {
 253         int i;
 254         struct commit *commit = (struct commit *) obj;
 255
 256         for (i = 0; i < used_atom_cnt; i++) {
 257                 const char *name = used_atom[i];
 258                 struct atom_value *v = &val[i];
 259                 if (!!deref != (*name == '*'))
 260                         continue;
 261                 if (deref)
 262                         name++;
 263                 if (!strcmp(name, "tree")) {
 264                         char *s = xmalloc(41);
 265                         strcpy(s, sha1_to_hex(commit->tree->object.sha1));
 266                         v->s = s;
 267                 }
 268                 if (!strcmp(name, "numparent")) {
 269                         char *s = xmalloc(40);
 270                         v->ul = num_parents(commit);
 271                         sprintf(s, "%lu", v->ul);
 272                         v->s = s;
 273                 }
 274                 else if (!strcmp(name, "parent")) {
 275                         int num = num_parents(commit);
 276                         int i;
 277                         struct commit_list *parents;
 278                         char *s = xmalloc(41 * num + 1);
 279                         v->s = s;
 280                         for (i = 0, parents = commit->parents;
 281                              parents;
 282                              parents = parents->next, i = i + 41) {
 283                                 struct commit *parent = parents->item;
 284                                 strcpy(s+i, sha1_to_hex(parent->object.sha1));
 285                                 if (parents->next)
 286                                         s[i+40] = ' ';
 287                         }
 288                         if (!i)
 289                                 *s = '\0';
 290                 }
 291         }
 292 }
 293
 294 static const char *find_wholine(const char *who, int wholen, const char *buf, unsigned long sz)
 295 {
 296         const char *eol;
 297         while (*buf) {
 298                 if (!strncmp(buf, who, wholen) &&
 299                     buf[wholen] == ' ')
 300                         return buf + wholen + 1;
 301                 eol = strchr(buf, '\n');
 302                 if (!eol)
 303                         return "";
 304                 eol++;
 305                 if (eol[1] == '\n')
 306                         return ""; /* end of header */
 307                 buf = eol;
 308         }
 309         return "";
 310 }
 311
 312 static const char *copy_line(const char *buf)
 313 {
 314         const char *eol = strchr(buf, '\n');
 315         if (!eol)
 316                 return "";
 317         return xmemdupz(buf, eol - buf);
 318 }
 319
 320 static const char *copy_name(const char *buf)
 321 {
 322         const char *cp;
 323         for (cp = buf; *cp && *cp != '\n'; cp++) {
 324                 if (!strncmp(cp, " <", 2))
 325                         return xmemdupz(buf, cp - buf);
 326         }
 327         return "";
 328 }
 329
 330 static const char *copy_email(const char *buf)
 331 {
 332         const char *email = strchr(buf, '<');
 333         const char *eoemail = strchr(email, '>');
 334         if (!email || !eoemail)
 335                 return "";
 336         return xmemdupz(email, eoemail + 1 - email);
 337 }
 338
 339 static void grab_date(const char *buf, struct atom_value *v, const char *atomname)
 340 {
 341         const char *eoemail = strstr(buf, "> ");
 342         char *zone;
 343         unsigned long timestamp;
 344         long tz;
 345         enum date_mode date_mode = DATE_NORMAL;
 346         const char *formatp;
 347
 348         /*
 349          * We got here because atomname ends in "date" or "date<something>";
 350          * it's not possible that <something> is not ":<format>" because
 351          * parse_atom() wouldn't have allowed it, so we can assume that no
 352          * ":" means no format is specified, and use the default.
 353          */
 354         formatp = strchr(atomname, ':');
 355         if (formatp != NULL) {
 356                 formatp++;
 357                 date_mode = parse_date_format(formatp);
 358         }
 359
 360         if (!eoemail)
 361                 goto bad;
 362         timestamp = strtoul(eoemail + 2, &zone, 10);
 363         if (timestamp == ULONG_MAX)
 364                 goto bad;
 365         tz = strtol(zone, NULL, 10);
 366         if ((tz == LONG_MIN || tz == LONG_MAX) && errno == ERANGE)
 367                 goto bad;
 368         v->s = xstrdup(show_date(timestamp, tz, date_mode));
 369         v->ul = timestamp;
 370         return;
 371  bad:
 372         v->s = "";
 373         v->ul = 0;
 374 }
 375
 376 /* See grab_values */
 377 static void grab_person(const char *who, struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 378 {
 379         int i;
 380         int wholen = strlen(who);
 381         const char *wholine = NULL;
 382
 383         for (i = 0; i < used_atom_cnt; i++) {
 384                 const char *name = used_atom[i];
 385                 struct atom_value *v = &val[i];
 386                 if (!!deref != (*name == '*'))
 387                         continue;
 388                 if (deref)
 389                         name++;
 390                 if (strncmp(who, name, wholen))
 391                         continue;
 392                 if (name[wholen] != 0 &&
 393                     strcmp(name + wholen, "name") &&
 394                     strcmp(name + wholen, "email") &&
 395                     prefixcmp(name + wholen, "date"))
 396                         continue;
 397                 if (!wholine)
 398                         wholine = find_wholine(who, wholen, buf, sz);
 399                 if (!wholine)
 400                         return; /* no point looking for it */
 401                 if (name[wholen] == 0)
 402                         v->s = copy_line(wholine);
 403                 else if (!strcmp(name + wholen, "name"))
 404                         v->s = copy_name(wholine);
 405                 else if (!strcmp(name + wholen, "email"))
 406                         v->s = copy_email(wholine);
 407                 else if (!prefixcmp(name + wholen, "date"))
 408                         grab_date(wholine, v, name);
 409         }
 410
 411         /* For a tag or a commit object, if "creator" or "creatordate" is
 412          * requested, do something special.
 413          */
 414         if (strcmp(who, "tagger") && strcmp(who, "committer"))
 415                 return; /* "author" for commit object is not wanted */
 416         if (!wholine)
 417                 wholine = find_wholine(who, wholen, buf, sz);
 418         if (!wholine)
 419                 return;
 420         for (i = 0; i < used_atom_cnt; i++) {
 421                 const char *name = used_atom[i];
 422                 struct atom_value *v = &val[i];
 423                 if (!!deref != (*name == '*'))
 424                         continue;
 425                 if (deref)
 426                         name++;
 427
 428                 if (!prefixcmp(name, "creatordate"))
 429                         grab_date(wholine, v, name);
 430                 else if (!strcmp(name, "creator"))
 431                         v->s = copy_line(wholine);
 432         }
 433 }
 434
 435 static void find_subpos(const char *buf, unsigned long sz, const char **sub, const char **body)
 436 {
 437         while (*buf) {
 438                 const char *eol = strchr(buf, '\n');
 439                 if (!eol)
 440                         return;
 441                 if (eol[1] == '\n') {
 442                         buf = eol + 1;
 443                         break; /* found end of header */
 444                 }
 445                 buf = eol + 1;
 446         }
 447         while (*buf == '\n')
 448                 buf++;
 449         if (!*buf)
 450                 return;
 451         *sub = buf; /* first non-empty line */
 452         buf = strchr(buf, '\n');
 453         if (!buf)
 454                 return; /* no body */
 455         while (*buf == '\n')
 456                 buf++; /* skip blank between subject and body */
 457         *body = buf;
 458 }
 459
 460 /* See grab_values */
 461 static void grab_sub_body_contents(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 462 {
 463         int i;
 464         const char *subpos = NULL, *bodypos = NULL;
 465
 466         for (i = 0; i < used_atom_cnt; i++) {
 467                 const char *name = used_atom[i];
 468                 struct atom_value *v = &val[i];
 469                 if (!!deref != (*name == '*'))
 470                         continue;
 471                 if (deref)
 472                         name++;
 473                 if (strcmp(name, "subject") &&
 474                     strcmp(name, "body") &&
 475                     strcmp(name, "contents"))
 476                         continue;
 477                 if (!subpos)
 478                         find_subpos(buf, sz, &subpos, &bodypos);
 479                 if (!subpos)
 480                         return;
 481
 482                 if (!strcmp(name, "subject"))
 483                         v->s = copy_line(subpos);
 484                 else if (!strcmp(name, "body"))
 485                         v->s = xstrdup(bodypos);
 486                 else if (!strcmp(name, "contents"))
 487                         v->s = xstrdup(subpos);
 488         }
 489 }
 490
 491 /* We want to have empty print-string for field requests
 492  * that do not apply (e.g. "authordate" for a tag object)
 493  */
 494 static void fill_missing_values(struct atom_value *val)
 495 {
 496         int i;
 497         for (i = 0; i < used_atom_cnt; i++) {
 498                 struct atom_value *v = &val[i];
 499                 if (v->s == NULL)
 500                         v->s = "";
 501         }
 502 }
 503
 504 /*
 505  * val is a list of atom_value to hold returned values.  Extract
 506  * the values for atoms in used_atom array out of (obj, buf, sz).
 507  * when deref is false, (obj, buf, sz) is the object that is
 508  * pointed at by the ref itself; otherwise it is the object the
 509  * ref (which is a tag) refers to.
 510  */
 511 static void grab_values(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 512 {
 513         grab_common_values(val, deref, obj, buf, sz);
 514         switch (obj->type) {
 515         case OBJ_TAG:
 516                 grab_tag_values(val, deref, obj, buf, sz);
 517                 grab_sub_body_contents(val, deref, obj, buf, sz);
 518                 grab_person("tagger", val, deref, obj, buf, sz);
 519                 break;
 520         case OBJ_COMMIT:
 521                 grab_commit_values(val, deref, obj, buf, sz);
 522                 grab_sub_body_contents(val, deref, obj, buf, sz);
 523                 grab_person("author", val, deref, obj, buf, sz);
 524                 grab_person("committer", val, deref, obj, buf, sz);
 525                 break;
 526         case OBJ_TREE:
 527                 // grab_tree_values(val, deref, obj, buf, sz);
 528                 break;
 529         case OBJ_BLOB:
 530                 // grab_blob_values(val, deref, obj, buf, sz);
 531                 break;
 532         default:
 533                 die("Eh?  Object of type %d?", obj->type);
 534         }
 535 }
 536
 537 /*
 538  * Parse the object referred by ref, and grab needed value.
 539  */
 540 static void populate_value(struct refinfo *ref)
 541 {
 542         void *buf;
 543         struct object *obj;
 544         int eaten, i;
 545         unsigned long size;
 546         const unsigned char *tagged;
 547
 548         ref->value = xcalloc(sizeof(struct atom_value), used_atom_cnt);
 549
 550         buf = get_obj(ref->objectname, &obj, &size, &eaten);
 551         if (!buf)
 552                 die("missing object %s for %s",
 553                     sha1_to_hex(ref->objectname), ref->refname);
 554         if (!obj)
 555                 die("parse_object_buffer failed on %s for %s",
 556                     sha1_to_hex(ref->objectname), ref->refname);
 557
 558         /* Fill in specials first */
 559         for (i = 0; i < used_atom_cnt; i++) {
 560                 const char *name = used_atom[i];
 561                 struct atom_value *v = &ref->value[i];
 562                 if (!strcmp(name, "refname"))
 563                         v->s = ref->refname;
 564                 else if (!strcmp(name, "*refname")) {
 565                         int len = strlen(ref->refname);
 566                         char *s = xmalloc(len + 4);
 567                         sprintf(s, "%s^{}", ref->refname);
 568                         v->s = s;
 569                 }
 570         }
 571
 572         grab_values(ref->value, 0, obj, buf, size);
 573         if (!eaten)
 574                 free(buf);
 575
 576         /* If there is no atom that wants to know about tagged
 577          * object, we are done.
 578          */
 579         if (!need_tagged || (obj->type != OBJ_TAG))
 580                 return;
 581
 582         /* If it is a tag object, see if we use a value that derefs
 583          * the object, and if we do grab the object it refers to.
 584          */
 585         tagged = ((struct tag *)obj)->tagged->sha1;
 586
 587         /* NEEDSWORK: This derefs tag only once, which
 588          * is good to deal with chains of trust, but
 589          * is not consistent with what deref_tag() does
 590          * which peels the onion to the core.
 591          */
 592         buf = get_obj(tagged, &obj, &size, &eaten);
 593         if (!buf)
 594                 die("missing object %s for %s",
 595                     sha1_to_hex(tagged), ref->refname);
 596         if (!obj)
 597                 die("parse_object_buffer failed on %s for %s",
 598                     sha1_to_hex(tagged), ref->refname);
 599         grab_values(ref->value, 1, obj, buf, size);
 600         if (!eaten)
 601                 free(buf);
 602 }
 603
 604 /*
 605  * Given a ref, return the value for the atom.  This lazily gets value
 606  * out of the object by calling populate value.
 607  */
 608 static void get_value(struct refinfo *ref, int atom, struct atom_value **v)
 609 {
 610         if (!ref->value) {
 611                 populate_value(ref);
 612                 fill_missing_values(ref->value);
 613         }
 614         *v = &ref->value[atom];
 615 }
 616
 617 struct grab_ref_cbdata {
 618         struct refinfo **grab_array;
 619         const char **grab_pattern;
 620         int grab_cnt;
 621 };
 622
 623 /*
 624  * A call-back given to for_each_ref().  It is unfortunate that we
 625  * need to use global variables to pass extra information to this
 626  * function.
 627  */
 628 static int grab_single_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 629 {
 630         struct grab_ref_cbdata *cb = cb_data;
 631         struct refinfo *ref;
 632         int cnt;
 633
 634         if (*cb->grab_pattern) {
 635                 const char **pattern;
 636                 int namelen = strlen(refname);
 637                 for (pattern = cb->grab_pattern; *pattern; pattern++) {
 638                         const char *p = *pattern;
 639                         int plen = strlen(p);
 640
 641                         if ((plen <= namelen) &&
 642                             !strncmp(refname, p, plen) &&
 643                             (refname[plen] == '\0' ||
 644                              refname[plen] == '/'))
 645                                 break;
 646                         if (!fnmatch(p, refname, FNM_PATHNAME))
 647                                 break;
 648                 }
 649                 if (!*pattern)
 650                         return 0;
 651         }
 652
 653         /* We do not open the object yet; sort may only need refname
 654          * to do its job and the resulting list may yet to be pruned
 655          * by maxcount logic.
 656          */
 657         ref = xcalloc(1, sizeof(*ref));
 658         ref->refname = xstrdup(refname);
 659         hashcpy(ref->objectname, sha1);
 660
 661         cnt = cb->grab_cnt;
 662         cb->grab_array = xrealloc(cb->grab_array,
 663                                   sizeof(*cb->grab_array) * (cnt + 1));
 664         cb->grab_array[cnt++] = ref;
 665         cb->grab_cnt = cnt;
 666         return 0;
 667 }
 668
 669 static int cmp_ref_sort(struct ref_sort *s, struct refinfo *a, struct refinfo *b)
 670 {
 671         struct atom_value *va, *vb;
 672         int cmp;
 673         cmp_type cmp_type = used_atom_type[s->atom];
 674
 675         get_value(a, s->atom, &va);
 676         get_value(b, s->atom, &vb);
 677         switch (cmp_type) {
 678         case FIELD_STR:
 679                 cmp = strcmp(va->s, vb->s);
 680                 break;
 681         default:
 682                 if (va->ul < vb->ul)
 683                         cmp = -1;
 684                 else if (va->ul == vb->ul)
 685                         cmp = 0;
 686                 else
 687                         cmp = 1;
 688                 break;
 689         }
 690         return (s->reverse) ? -cmp : cmp;
 691 }
 692
 693 static struct ref_sort *ref_sort;
 694 static int compare_refs(const void *a_, const void *b_)
 695 {
 696         struct refinfo *a = *((struct refinfo **)a_);
 697         struct refinfo *b = *((struct refinfo **)b_);
 698         struct ref_sort *s;
 699
 700         for (s = ref_sort; s; s = s->next) {
 701                 int cmp = cmp_ref_sort(s, a, b);
 702                 if (cmp)
 703                         return cmp;
 704         }
 705         return 0;
 706 }
 707
 708 static void sort_refs(struct ref_sort *sort, struct refinfo **refs, int num_refs)
 709 {
 710         ref_sort = sort;
 711         qsort(refs, num_refs, sizeof(struct refinfo *), compare_refs);
 712 }
 713
 714 static void print_value(struct refinfo *ref, int atom, int quote_style)
 715 {
 716         struct atom_value *v;
 717         get_value(ref, atom, &v);
 718         switch (quote_style) {
 719         case QUOTE_NONE:
 720                 fputs(v->s, stdout);
 721                 break;
 722         case QUOTE_SHELL:
 723                 sq_quote_print(stdout, v->s);
 724                 break;
 725         case QUOTE_PERL:
 726                 perl_quote_print(stdout, v->s);
 727                 break;
 728         case QUOTE_PYTHON:
 729                 python_quote_print(stdout, v->s);
 730                 break;
 731         case QUOTE_TCL:
 732                 tcl_quote_print(stdout, v->s);
 733                 break;
 734         }
 735 }
 736
 737 static int hex1(char ch)
 738 {
 739         if ('0' <= ch && ch <= '9')
 740                 return ch - '0';
 741         else if ('a' <= ch && ch <= 'f')
 742                 return ch - 'a' + 10;
 743         else if ('A' <= ch && ch <= 'F')
 744                 return ch - 'A' + 10;
 745         return -1;
 746 }
 747 static int hex2(const char *cp)
 748 {
 749         if (cp[0] && cp[1])
 750                 return (hex1(cp[0]) << 4) | hex1(cp[1]);
 751         else
 752                 return -1;
 753 }
 754
 755 static void emit(const char *cp, const char *ep)
 756 {
 757         while (*cp && (!ep || cp < ep)) {
 758                 if (*cp == '%') {
 759                         if (cp[1] == '%')
 760                                 cp++;
 761                         else {
 762                                 int ch = hex2(cp + 1);
 763                                 if (0 <= ch) {
 764                                         putchar(ch);
 765                                         cp += 3;
 766                                         continue;
 767                                 }
 768                         }
 769                 }
 770                 putchar(*cp);
 771                 cp++;
 772         }
 773 }
 774
 775 static void show_ref(struct refinfo *info, const char *format, int quote_style)
 776 {
 777         const char *cp, *sp, *ep;
 778
 779         for (cp = format; *cp && (sp = find_next(cp)); cp = ep + 1) {
 780                 ep = strchr(sp, ')');
 781                 if (cp < sp)
 782                         emit(cp, sp);
 783                 print_value(info, parse_atom(sp + 2, ep), quote_style);
 784         }
 785         if (*cp) {
 786                 sp = cp + strlen(cp);
 787                 emit(cp, sp);
 788         }
 789         putchar('\n');
 790 }
 791
 792 static struct ref_sort *default_sort(void)
 793 {
 794         static const char cstr_name[] = "refname";
 795
 796         struct ref_sort *sort = xcalloc(1, sizeof(*sort));
 797
 798         sort->next = NULL;
 799         sort->atom = parse_atom(cstr_name, cstr_name + strlen(cstr_name));
 800         return sort;
 801 }
 802
 803 int cmd_for_each_ref(int ac, const char **av, const char *prefix)
 804 {
 805         int i, num_refs;
 806         const char *format = NULL;
 807         struct ref_sort *sort = NULL, **sort_tail = &sort;
 808         int maxcount = 0;
 809         int quote_style = -1; /* unspecified yet */
 810         struct refinfo **refs;
 811         struct grab_ref_cbdata cbdata;
 812
 813         for (i = 1; i < ac; i++) {
 814                 const char *arg = av[i];
 815                 if (arg[0] != '-')
 816                         break;
 817                 if (!strcmp(arg, "--")) {
 818                         i++;
 819                         break;
 820                 }
 821                 if (!prefixcmp(arg, "--format=")) {
 822                         if (format)
 823                                 die("more than one --format?");
 824                         format = arg + 9;
 825                         continue;
 826                 }
 827                 if (!strcmp(arg, "-s") || !strcmp(arg, "--shell") ) {
 828                         if (0 <= quote_style)
 829                                 die("more than one quoting style?");
 830                         quote_style = QUOTE_SHELL;
 831                         continue;
 832                 }
 833                 if (!strcmp(arg, "-p") || !strcmp(arg, "--perl") ) {
 834                         if (0 <= quote_style)
 835                                 die("more than one quoting style?");
 836                         quote_style = QUOTE_PERL;
 837                         continue;
 838                 }
 839                 if (!strcmp(arg, "--python") ) {
 840                         if (0 <= quote_style)
 841                                 die("more than one quoting style?");
 842                         quote_style = QUOTE_PYTHON;
 843                         continue;
 844                 }
 845                 if (!strcmp(arg, "--tcl") ) {
 846                         if (0 <= quote_style)
 847                                 die("more than one quoting style?");
 848                         quote_style = QUOTE_TCL;
 849                         continue;
 850                 }
 851                 if (!prefixcmp(arg, "--count=")) {
 852                         if (maxcount)
 853                                 die("more than one --count?");
 854                         maxcount = atoi(arg + 8);
 855                         if (maxcount <= 0)
 856                                 die("The number %s did not parse", arg);
 857                         continue;
 858                 }
 859                 if (!prefixcmp(arg, "--sort=")) {
 860                         struct ref_sort *s = xcalloc(1, sizeof(*s));
 861                         int len;
 862
 863                         s->next = NULL;
 864                         *sort_tail = s;
 865                         sort_tail = &s->next;
 866
 867                         arg += 7;
 868                         if (*arg == '-') {
 869                                 s->reverse = 1;
 870                                 arg++;
 871                         }
 872                         len = strlen(arg);
 873                         sort->atom = parse_atom(arg, arg+len);
 874                         continue;
 875                 }
 876                 break;
 877         }
 878         if (quote_style < 0)
 879                 quote_style = QUOTE_NONE;
 880
 881         if (!sort)
 882                 sort = default_sort();
 883         sort_atom_limit = used_atom_cnt;
 884         if (!format)
 885                 format = "%(objectname) %(objecttype)\t%(refname)";
 886
 887         verify_format(format);
 888
 889         memset(&cbdata, 0, sizeof(cbdata));
 890         cbdata.grab_pattern = av + i;
 891         for_each_ref(grab_single_ref, &cbdata);
 892         refs = cbdata.grab_array;
 893         num_refs = cbdata.grab_cnt;
 894
 895         for (i = 0; i < used_atom_cnt; i++) {
 896                 if (used_atom[i][0] == '*') {
 897                         need_tagged = 1;
 898                         break;
 899                 }
 900         }
 901
 902         sort_refs(sort, refs, num_refs);
 903
 904         if (!maxcount || num_refs < maxcount)
 905                 maxcount = num_refs;
 906         for (i = 0; i < maxcount; i++)
 907                 show_ref(refs[i], format, quote_style);
 908         return 0;
 909 }