builtin-for-each-ref.c

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