builtin-for-each-ref.c

   1 #include "builtin.h"
   2 #include "cache.h"
   3 #include "refs.h"
   4 #include "object.h"
   5 #include "tag.h"
   6 #include "commit.h"
   7 #include "tree.h"
   8 #include "blob.h"
   9 #include "quote.h"
  10
  11 /* Quoting styles */
  12 #define QUOTE_NONE 0
  13 #define QUOTE_SHELL 1
  14 #define QUOTE_PERL 2
  15 #define QUOTE_PYTHON 3
  16 #define QUOTE_TCL 4
  17
  18 typedef enum { FIELD_STR, FIELD_ULONG, FIELD_TIME } cmp_type;
  19
  20 struct atom_value {
  21         const char *s;
  22         unsigned long ul; /* used for sorting when not FIELD_STR */
  23 };
  24
  25 struct ref_sort {
  26         struct ref_sort *next;
  27         int atom; /* index into used_atom array */
  28         unsigned reverse : 1;
  29 };
  30
  31 struct refinfo {
  32         char *refname;
  33         unsigned char objectname[20];
  34         struct atom_value *value;
  35 };
  36
  37 static struct {
  38         const char *name;
  39         cmp_type cmp_type;
  40 } valid_atom[] = {
  41         { "refname" },
  42         { "objecttype" },
  43         { "objectsize", FIELD_ULONG },
  44         { "objectname" },
  45         { "tree" },
  46         { "parent" }, /* NEEDSWORK: how to address 2nd and later parents? */
  47         { "numparent", FIELD_ULONG },
  48         { "object" },
  49         { "type" },
  50         { "tag" },
  51         { "author" },
  52         { "authorname" },
  53         { "authoremail" },
  54         { "authordate", FIELD_TIME },
  55         { "committer" },
  56         { "committername" },
  57         { "committeremail" },
  58         { "committerdate", FIELD_TIME },
  59         { "tagger" },
  60         { "taggername" },
  61         { "taggeremail" },
  62         { "taggerdate", FIELD_TIME },
  63         { "creator" },
  64         { "creatordate", FIELD_TIME },
  65         { "subject" },
  66         { "body" },
  67         { "contents" },
  68 };
  69
  70 /*
  71  * An atom is a valid field atom listed above, possibly prefixed with
  72  * a "*" to denote deref_tag().
  73  *
  74  * We parse given format string and sort specifiers, and make a list
  75  * of properties that we need to extract out of objects.  refinfo
  76  * structure will hold an array of values extracted that can be
  77  * indexed with the "atom number", which is an index into this
  78  * array.
  79  */
  80 static const char **used_atom;
  81 static cmp_type *used_atom_type;
  82 static int used_atom_cnt, sort_atom_limit, need_tagged;
  83
  84 /*
  85  * Used to parse format string and sort specifiers
  86  */
  87 static int parse_atom(const char *atom, const char *ep)
  88 {
  89         const char *sp;
  90         char *n;
  91         int i, at;
  92
  93         sp = atom;
  94         if (*sp == '*' && sp < ep)
  95                 sp++; /* deref */
  96         if (ep <= sp)
  97                 die("malformed field name: %.*s", (int)(ep-atom), atom);
  98
  99         /* Do we have the atom already used elsewhere? */
 100         for (i = 0; i < used_atom_cnt; i++) {
 101                 int len = strlen(used_atom[i]);
 102                 if (len == ep - atom && !memcmp(used_atom[i], atom, len))
 103                         return i;
 104         }
 105
 106         /* Is the atom a valid one? */
 107         for (i = 0; i < ARRAY_SIZE(valid_atom); i++) {
 108                 int len = strlen(valid_atom[i].name);
 109                 if (len == ep - sp && !memcmp(valid_atom[i].name, sp, len))
 110                         break;
 111         }
 112
 113         if (ARRAY_SIZE(valid_atom) <= i)
 114                 die("unknown field name: %.*s", (int)(ep-atom), atom);
 115
 116         /* Add it in, including the deref prefix */
 117         at = used_atom_cnt;
 118         used_atom_cnt++;
 119         used_atom = xrealloc(used_atom,
 120                              (sizeof *used_atom) * used_atom_cnt);
 121         used_atom_type = xrealloc(used_atom_type,
 122                                   (sizeof(*used_atom_type) * used_atom_cnt));
 123         n = xmalloc(ep - atom + 1);
 124         memcpy(n, atom, ep - atom);
 125         n[ep-atom] = 0;
 126         used_atom[at] = n;
 127         used_atom_type[at] = valid_atom[i].cmp_type;
 128         return at;
 129 }
 130
 131 /*
 132  * In a format string, find the next occurrence of %(atom).
 133  */
 134 static const char *find_next(const char *cp)
 135 {
 136         while (*cp) {
 137                 if (*cp == '%') {
 138                         /* %( is the start of an atom;
 139                          * %% is a quoted per-cent.
 140                          */
 141                         if (cp[1] == '(')
 142                                 return cp;
 143                         else if (cp[1] == '%')
 144                                 cp++; /* skip over two % */
 145                         /* otherwise this is a singleton, literal % */
 146                 }
 147                 cp++;
 148         }
 149         return NULL;
 150 }
 151
 152 /*
 153  * Make sure the format string is well formed, and parse out
 154  * the used atoms.
 155  */
 156 static void verify_format(const char *format)
 157 {
 158         const char *cp, *sp;
 159         for (cp = format; *cp && (sp = find_next(cp)); ) {
 160                 const char *ep = strchr(sp, ')');
 161                 if (!ep)
 162                         die("malformatted format string %s", sp);
 163                 /* sp points at "%(" and ep points at the closing ")" */
 164                 parse_atom(sp + 2, ep);
 165                 cp = ep + 1;
 166         }
 167 }
 168
 169 /*
 170  * Given an object name, read the object data and size, and return a
 171  * "struct object".  If the object data we are returning is also borrowed
 172  * by the "struct object" representation, set *eaten as well---it is a
 173  * signal from parse_object_buffer to us not to free the buffer.
 174  */
 175 static void *get_obj(const unsigned char *sha1, struct object **obj, unsigned long *sz, int *eaten)
 176 {
 177         enum object_type type;
 178         void *buf = read_sha1_file(sha1, &type, sz);
 179
 180         if (buf)
 181                 *obj = parse_object_buffer(sha1, type, *sz, buf, eaten);
 182         else
 183                 *obj = NULL;
 184         return buf;
 185 }
 186
 187 /* See grab_values */
 188 static void grab_common_values(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 189 {
 190         int i;
 191
 192         for (i = 0; i < used_atom_cnt; i++) {
 193                 const char *name = used_atom[i];
 194                 struct atom_value *v = &val[i];
 195                 if (!!deref != (*name == '*'))
 196                         continue;
 197                 if (deref)
 198                         name++;
 199                 if (!strcmp(name, "objecttype"))
 200                         v->s = typename(obj->type);
 201                 else if (!strcmp(name, "objectsize")) {
 202                         char *s = xmalloc(40);
 203                         sprintf(s, "%lu", sz);
 204                         v->ul = sz;
 205                         v->s = s;
 206                 }
 207                 else if (!strcmp(name, "objectname")) {
 208                         char *s = xmalloc(41);
 209                         strcpy(s, sha1_to_hex(obj->sha1));
 210                         v->s = s;
 211                 }
 212         }
 213 }
 214
 215 /* See grab_values */
 216 static void grab_tag_values(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 217 {
 218         int i;
 219         struct tag *tag = (struct tag *) obj;
 220
 221         for (i = 0; i < used_atom_cnt; i++) {
 222                 const char *name = used_atom[i];
 223                 struct atom_value *v = &val[i];
 224                 if (!!deref != (*name == '*'))
 225                         continue;
 226                 if (deref)
 227                         name++;
 228                 if (!strcmp(name, "tag"))
 229                         v->s = tag->tag;
 230         }
 231 }
 232
 233 static int num_parents(struct commit *commit)
 234 {
 235         struct commit_list *parents;
 236         int i;
 237
 238         for (i = 0, parents = commit->parents;
 239              parents;
 240              parents = parents->next)
 241                 i++;
 242         return i;
 243 }
 244
 245 /* See grab_values */
 246 static void grab_commit_values(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 247 {
 248         int i;
 249         struct commit *commit = (struct commit *) obj;
 250
 251         for (i = 0; i < used_atom_cnt; i++) {
 252                 const char *name = used_atom[i];
 253                 struct atom_value *v = &val[i];
 254                 if (!!deref != (*name == '*'))
 255                         continue;
 256                 if (deref)
 257                         name++;
 258                 if (!strcmp(name, "tree")) {
 259                         char *s = xmalloc(41);
 260                         strcpy(s, sha1_to_hex(commit->tree->object.sha1));
 261                         v->s = s;
 262                 }
 263                 if (!strcmp(name, "numparent")) {
 264                         char *s = xmalloc(40);
 265                         sprintf(s, "%lu", v->ul);
 266                         v->s = s;
 267                         v->ul = num_parents(commit);
 268                 }
 269                 else if (!strcmp(name, "parent")) {
 270                         int num = num_parents(commit);
 271                         int i;
 272                         struct commit_list *parents;
 273                         char *s = xmalloc(42 * num);
 274                         v->s = s;
 275                         for (i = 0, parents = commit->parents;
 276                              parents;
 277                              parents = parents->next, i = i + 42) {
 278                                 struct commit *parent = parents->item;
 279                                 strcpy(s+i, sha1_to_hex(parent->object.sha1));
 280                                 if (parents->next)
 281                                         s[i+40] = ' ';
 282                         }
 283                 }
 284         }
 285 }
 286
 287 static const char *find_wholine(const char *who, int wholen, const char *buf, unsigned long sz)
 288 {
 289         const char *eol;
 290         while (*buf) {
 291                 if (!strncmp(buf, who, wholen) &&
 292                     buf[wholen] == ' ')
 293                         return buf + wholen + 1;
 294                 eol = strchr(buf, '\n');
 295                 if (!eol)
 296                         return "";
 297                 eol++;
 298                 if (eol[1] == '\n')
 299                         return ""; /* end of header */
 300                 buf = eol;
 301         }
 302         return "";
 303 }
 304
 305 static const char *copy_line(const char *buf)
 306 {
 307         const char *eol = strchr(buf, '\n');
 308         char *line;
 309         int len;
 310         if (!eol)
 311                 return "";
 312         len = eol - buf;
 313         line = xmalloc(len + 1);
 314         memcpy(line, buf, len);
 315         line[len] = 0;
 316         return line;
 317 }
 318
 319 static const char *copy_name(const char *buf)
 320 {
 321         const char *eol = strchr(buf, '\n');
 322         const char *eoname = strstr(buf, " <");
 323         char *line;
 324         int len;
 325         if (!(eoname && eol && eoname < eol))
 326                 return "";
 327         len = eoname - buf;
 328         line = xmalloc(len + 1);
 329         memcpy(line, buf, len);
 330         line[len] = 0;
 331         return line;
 332 }
 333
 334 static const char *copy_email(const char *buf)
 335 {
 336         const char *email = strchr(buf, '<');
 337         const char *eoemail = strchr(email, '>');
 338         char *line;
 339         int len;
 340         if (!email || !eoemail)
 341                 return "";
 342         eoemail++;
 343         len = eoemail - email;
 344         line = xmalloc(len + 1);
 345         memcpy(line, email, len);
 346         line[len] = 0;
 347         return line;
 348 }
 349
 350 static void grab_date(const char *buf, struct atom_value *v)
 351 {
 352         const char *eoemail = strstr(buf, "> ");
 353         char *zone;
 354         unsigned long timestamp;
 355         long tz;
 356
 357         if (!eoemail)
 358                 goto bad;
 359         timestamp = strtoul(eoemail + 2, &zone, 10);
 360         if (timestamp == ULONG_MAX)
 361                 goto bad;
 362         tz = strtol(zone, NULL, 10);
 363         if ((tz == LONG_MIN || tz == LONG_MAX) && errno == ERANGE)
 364                 goto bad;
 365         v->s = xstrdup(show_date(timestamp, tz, 0));
 366         v->ul = timestamp;
 367         return;
 368  bad:
 369         v->s = "";
 370         v->ul = 0;
 371 }
 372
 373 /* See grab_values */
 374 static void grab_person(const char *who, struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 375 {
 376         int i;
 377         int wholen = strlen(who);
 378         const char *wholine = NULL;
 379
 380         for (i = 0; i < used_atom_cnt; i++) {
 381                 const char *name = used_atom[i];
 382                 struct atom_value *v = &val[i];
 383                 if (!!deref != (*name == '*'))
 384                         continue;
 385                 if (deref)
 386                         name++;
 387                 if (strncmp(who, name, wholen))
 388                         continue;
 389                 if (name[wholen] != 0 &&
 390                     strcmp(name + wholen, "name") &&
 391                     strcmp(name + wholen, "email") &&
 392                     strcmp(name + wholen, "date"))
 393                         continue;
 394                 if (!wholine)
 395                         wholine = find_wholine(who, wholen, buf, sz);
 396                 if (!wholine)
 397                         return; /* no point looking for it */
 398                 if (name[wholen] == 0)
 399                         v->s = copy_line(wholine);
 400                 else if (!strcmp(name + wholen, "name"))
 401                         v->s = copy_name(wholine);
 402                 else if (!strcmp(name + wholen, "email"))
 403                         v->s = copy_email(wholine);
 404                 else if (!strcmp(name + wholen, "date"))
 405                         grab_date(wholine, v);
 406         }
 407
 408         /* For a tag or a commit object, if "creator" or "creatordate" is
 409          * requested, do something special.
 410          */
 411         if (strcmp(who, "tagger") && strcmp(who, "committer"))
 412                 return; /* "author" for commit object is not wanted */
 413         if (!wholine)
 414                 wholine = find_wholine(who, wholen, buf, sz);
 415         if (!wholine)
 416                 return;
 417         for (i = 0; i < used_atom_cnt; i++) {
 418                 const char *name = used_atom[i];
 419                 struct atom_value *v = &val[i];
 420                 if (!!deref != (*name == '*'))
 421                         continue;
 422                 if (deref)
 423                         name++;
 424
 425                 if (!strcmp(name, "creatordate"))
 426                         grab_date(wholine, v);
 427                 else if (!strcmp(name, "creator"))
 428                         v->s = copy_line(wholine);
 429         }
 430 }
 431
 432 static void find_subpos(const char *buf, unsigned long sz, const char **sub, const char **body)
 433 {
 434         while (*buf) {
 435                 const char *eol = strchr(buf, '\n');
 436                 if (!eol)
 437                         return;
 438                 if (eol[1] == '\n') {
 439                         buf = eol + 1;
 440                         break; /* found end of header */
 441                 }
 442                 buf = eol + 1;
 443         }
 444         while (*buf == '\n')
 445                 buf++;
 446         if (!*buf)
 447                 return;
 448         *sub = buf; /* first non-empty line */
 449         buf = strchr(buf, '\n');
 450         if (!buf)
 451                 return; /* no body */
 452         while (*buf == '\n')
 453                 buf++; /* skip blank between subject and body */
 454         *body = buf;
 455 }
 456
 457 /* See grab_values */
 458 static void grab_sub_body_contents(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 459 {
 460         int i;
 461         const char *subpos = NULL, *bodypos = NULL;
 462
 463         for (i = 0; i < used_atom_cnt; i++) {
 464                 const char *name = used_atom[i];
 465                 struct atom_value *v = &val[i];
 466                 if (!!deref != (*name == '*'))
 467                         continue;
 468                 if (deref)
 469                         name++;
 470                 if (strcmp(name, "subject") &&
 471                     strcmp(name, "body") &&
 472                     strcmp(name, "contents"))
 473                         continue;
 474                 if (!subpos)
 475                         find_subpos(buf, sz, &subpos, &bodypos);
 476                 if (!subpos)
 477                         return;
 478
 479                 if (!strcmp(name, "subject"))
 480                         v->s = copy_line(subpos);
 481                 else if (!strcmp(name, "body"))
 482                         v->s = xstrdup(bodypos);
 483                 else if (!strcmp(name, "contents"))
 484                         v->s = xstrdup(subpos);
 485         }
 486 }
 487
 488 /* We want to have empty print-string for field requests
 489  * that do not apply (e.g. "authordate" for a tag object)
 490  */
 491 static void fill_missing_values(struct atom_value *val)
 492 {
 493         int i;
 494         for (i = 0; i < used_atom_cnt; i++) {
 495                 struct atom_value *v = &val[i];
 496                 if (v->s == NULL)
 497                         v->s = "";
 498         }
 499 }
 500
 501 /*
 502  * val is a list of atom_value to hold returned values.  Extract
 503  * the values for atoms in used_atom array out of (obj, buf, sz).
 504  * when deref is false, (obj, buf, sz) is the object that is
 505  * pointed at by the ref itself; otherwise it is the object the
 506  * ref (which is a tag) refers to.
 507  */
 508 static void grab_values(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 509 {
 510         grab_common_values(val, deref, obj, buf, sz);
 511         switch (obj->type) {
 512         case OBJ_TAG:
 513                 grab_tag_values(val, deref, obj, buf, sz);
 514                 grab_sub_body_contents(val, deref, obj, buf, sz);
 515                 grab_person("tagger", val, deref, obj, buf, sz);
 516                 break;
 517         case OBJ_COMMIT:
 518                 grab_commit_values(val, deref, obj, buf, sz);
 519                 grab_sub_body_contents(val, deref, obj, buf, sz);
 520                 grab_person("author", val, deref, obj, buf, sz);
 521                 grab_person("committer", val, deref, obj, buf, sz);
 522                 break;
 523         case OBJ_TREE:
 524                 // grab_tree_values(val, deref, obj, buf, sz);
 525                 break;
 526         case OBJ_BLOB:
 527                 // grab_blob_values(val, deref, obj, buf, sz);
 528                 break;
 529         default:
 530                 die("Eh?  Object of type %d?", obj->type);
 531         }
 532 }
 533
 534 /*
 535  * Parse the object referred by ref, and grab needed value.
 536  */
 537 static void populate_value(struct refinfo *ref)
 538 {
 539         void *buf;
 540         struct object *obj;
 541         int eaten, i;
 542         unsigned long size;
 543         const unsigned char *tagged;
 544
 545         ref->value = xcalloc(sizeof(struct atom_value), used_atom_cnt);
 546
 547         buf = get_obj(ref->objectname, &obj, &size, &eaten);
 548         if (!buf)
 549                 die("missing object %s for %s",
 550                     sha1_to_hex(ref->objectname), ref->refname);
 551         if (!obj)
 552                 die("parse_object_buffer failed on %s for %s",
 553                     sha1_to_hex(ref->objectname), ref->refname);
 554
 555         /* Fill in specials first */
 556         for (i = 0; i < used_atom_cnt; i++) {
 557                 const char *name = used_atom[i];
 558                 struct atom_value *v = &ref->value[i];
 559                 if (!strcmp(name, "refname"))
 560                         v->s = ref->refname;
 561                 else if (!strcmp(name, "*refname")) {
 562                         int len = strlen(ref->refname);
 563                         char *s = xmalloc(len + 4);
 564                         sprintf(s, "%s^{}", ref->refname);
 565                         v->s = s;
 566                 }
 567         }
 568
 569         grab_values(ref->value, 0, obj, buf, size);
 570         if (!eaten)
 571                 free(buf);
 572
 573         /* If there is no atom that wants to know about tagged
 574          * object, we are done.
 575          */
 576         if (!need_tagged || (obj->type != OBJ_TAG))
 577                 return;
 578
 579         /* If it is a tag object, see if we use a value that derefs
 580          * the object, and if we do grab the object it refers to.
 581          */
 582         tagged = ((struct tag *)obj)->tagged->sha1;
 583
 584         /* NEEDSWORK: This derefs tag only once, which
 585          * is good to deal with chains of trust, but
 586          * is not consistent with what deref_tag() does
 587          * which peels the onion to the core.
 588          */
 589         buf = get_obj(tagged, &obj, &size, &eaten);
 590         if (!buf)
 591                 die("missing object %s for %s",
 592                     sha1_to_hex(tagged), ref->refname);
 593         if (!obj)
 594                 die("parse_object_buffer failed on %s for %s",
 595                     sha1_to_hex(tagged), ref->refname);
 596         grab_values(ref->value, 1, obj, buf, size);
 597         if (!eaten)
 598                 free(buf);
 599 }
 600
 601 /*
 602  * Given a ref, return the value for the atom.  This lazily gets value
 603  * out of the object by calling populate value.
 604  */
 605 static void get_value(struct refinfo *ref, int atom, struct atom_value **v)
 606 {
 607         if (!ref->value) {
 608                 populate_value(ref);
 609                 fill_missing_values(ref->value);
 610         }
 611         *v = &ref->value[atom];
 612 }
 613
 614 struct grab_ref_cbdata {
 615         struct refinfo **grab_array;
 616         const char **grab_pattern;
 617         int grab_cnt;
 618 };
 619
 620 /*
 621  * A call-back given to for_each_ref().  It is unfortunate that we
 622  * need to use global variables to pass extra information to this
 623  * function.
 624  */
 625 static int grab_single_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 626 {
 627         struct grab_ref_cbdata *cb = cb_data;
 628         struct refinfo *ref;
 629         int cnt;
 630
 631         if (*cb->grab_pattern) {
 632                 const char **pattern;
 633                 int namelen = strlen(refname);
 634                 for (pattern = cb->grab_pattern; *pattern; pattern++) {
 635                         const char *p = *pattern;
 636                         int plen = strlen(p);
 637
 638                         if ((plen <= namelen) &&
 639                             !strncmp(refname, p, plen) &&
 640                             (refname[plen] == '\0' ||
 641                              refname[plen] == '/'))
 642                                 break;
 643                         if (!fnmatch(p, refname, FNM_PATHNAME))
 644                                 break;
 645                 }
 646                 if (!*pattern)
 647                         return 0;
 648         }
 649
 650         /* We do not open the object yet; sort may only need refname
 651          * to do its job and the resulting list may yet to be pruned
 652          * by maxcount logic.
 653          */
 654         ref = xcalloc(1, sizeof(*ref));
 655         ref->refname = xstrdup(refname);
 656         hashcpy(ref->objectname, sha1);
 657
 658         cnt = cb->grab_cnt;
 659         cb->grab_array = xrealloc(cb->grab_array,
 660                                   sizeof(*cb->grab_array) * (cnt + 1));
 661         cb->grab_array[cnt++] = ref;
 662         cb->grab_cnt = cnt;
 663         return 0;
 664 }
 665
 666 static int cmp_ref_sort(struct ref_sort *s, struct refinfo *a, struct refinfo *b)
 667 {
 668         struct atom_value *va, *vb;
 669         int cmp;
 670         cmp_type cmp_type = used_atom_type[s->atom];
 671
 672         get_value(a, s->atom, &va);
 673         get_value(b, s->atom, &vb);
 674         switch (cmp_type) {
 675         case FIELD_STR:
 676                 cmp = strcmp(va->s, vb->s);
 677                 break;
 678         default:
 679                 if (va->ul < vb->ul)
 680                         cmp = -1;
 681                 else if (va->ul == vb->ul)
 682                         cmp = 0;
 683                 else
 684                         cmp = 1;
 685                 break;
 686         }
 687         return (s->reverse) ? -cmp : cmp;
 688 }
 689
 690 static struct ref_sort *ref_sort;
 691 static int compare_refs(const void *a_, const void *b_)
 692 {
 693         struct refinfo *a = *((struct refinfo **)a_);
 694         struct refinfo *b = *((struct refinfo **)b_);
 695         struct ref_sort *s;
 696
 697         for (s = ref_sort; s; s = s->next) {
 698                 int cmp = cmp_ref_sort(s, a, b);
 699                 if (cmp)
 700                         return cmp;
 701         }
 702         return 0;
 703 }
 704
 705 static void sort_refs(struct ref_sort *sort, struct refinfo **refs, int num_refs)
 706 {
 707         ref_sort = sort;
 708         qsort(refs, num_refs, sizeof(struct refinfo *), compare_refs);
 709 }
 710
 711 static void print_value(struct refinfo *ref, int atom, int quote_style)
 712 {
 713         struct atom_value *v;
 714         get_value(ref, atom, &v);
 715         switch (quote_style) {
 716         case QUOTE_NONE:
 717                 fputs(v->s, stdout);
 718                 break;
 719         case QUOTE_SHELL:
 720                 sq_quote_print(stdout, v->s);
 721                 break;
 722         case QUOTE_PERL:
 723                 perl_quote_print(stdout, v->s);
 724                 break;
 725         case QUOTE_PYTHON:
 726                 python_quote_print(stdout, v->s);
 727                 break;
 728         case QUOTE_TCL:
 729                 tcl_quote_print(stdout, v->s);
 730                 break;
 731         }
 732 }
 733
 734 static int hex1(char ch)
 735 {
 736         if ('0' <= ch && ch <= '9')
 737                 return ch - '0';
 738         else if ('a' <= ch && ch <= 'f')
 739                 return ch - 'a' + 10;
 740         else if ('A' <= ch && ch <= 'F')
 741                 return ch - 'A' + 10;
 742         return -1;
 743 }
 744 static int hex2(const char *cp)
 745 {
 746         if (cp[0] && cp[1])
 747                 return (hex1(cp[0]) << 4) | hex1(cp[1]);
 748         else
 749                 return -1;
 750 }
 751
 752 static void emit(const char *cp, const char *ep)
 753 {
 754         while (*cp && (!ep || cp < ep)) {
 755                 if (*cp == '%') {
 756                         if (cp[1] == '%')
 757                                 cp++;
 758                         else {
 759                                 int ch = hex2(cp + 1);
 760                                 if (0 <= ch) {
 761                                         putchar(ch);
 762                                         cp += 3;
 763                                         continue;
 764                                 }
 765                         }
 766                 }
 767                 putchar(*cp);
 768                 cp++;
 769         }
 770 }
 771
 772 static void show_ref(struct refinfo *info, const char *format, int quote_style)
 773 {
 774         const char *cp, *sp, *ep;
 775
 776         for (cp = format; *cp && (sp = find_next(cp)); cp = ep + 1) {
 777                 ep = strchr(sp, ')');
 778                 if (cp < sp)
 779                         emit(cp, sp);
 780                 print_value(info, parse_atom(sp + 2, ep), quote_style);
 781         }
 782         if (*cp) {
 783                 sp = cp + strlen(cp);
 784                 emit(cp, sp);
 785         }
 786         putchar('\n');
 787 }
 788
 789 static struct ref_sort *default_sort(void)
 790 {
 791         static const char cstr_name[] = "refname";
 792
 793         struct ref_sort *sort = xcalloc(1, sizeof(*sort));
 794
 795         sort->next = NULL;
 796         sort->atom = parse_atom(cstr_name, cstr_name + strlen(cstr_name));
 797         return sort;
 798 }
 799
 800 int cmd_for_each_ref(int ac, const char **av, const char *prefix)
 801 {
 802         int i, num_refs;
 803         const char *format = NULL;
 804         struct ref_sort *sort = NULL, **sort_tail = &sort;
 805         int maxcount = 0;
 806         int quote_style = -1; /* unspecified yet */
 807         struct refinfo **refs;
 808         struct grab_ref_cbdata cbdata;
 809
 810         for (i = 1; i < ac; i++) {
 811                 const char *arg = av[i];
 812                 if (arg[0] != '-')
 813                         break;
 814                 if (!strcmp(arg, "--")) {
 815                         i++;
 816                         break;
 817                 }
 818                 if (!prefixcmp(arg, "--format=")) {
 819                         if (format)
 820                                 die("more than one --format?");
 821                         format = arg + 9;
 822                         continue;
 823                 }
 824                 if (!strcmp(arg, "-s") || !strcmp(arg, "--shell") ) {
 825                         if (0 <= quote_style)
 826                                 die("more than one quoting style?");
 827                         quote_style = QUOTE_SHELL;
 828                         continue;
 829                 }
 830                 if (!strcmp(arg, "-p") || !strcmp(arg, "--perl") ) {
 831                         if (0 <= quote_style)
 832                                 die("more than one quoting style?");
 833                         quote_style = QUOTE_PERL;
 834                         continue;
 835                 }
 836                 if (!strcmp(arg, "--python") ) {
 837                         if (0 <= quote_style)
 838                                 die("more than one quoting style?");
 839                         quote_style = QUOTE_PYTHON;
 840                         continue;
 841                 }
 842                 if (!strcmp(arg, "--tcl") ) {
 843                         if (0 <= quote_style)
 844                                 die("more than one quoting style?");
 845                         quote_style = QUOTE_TCL;
 846                         continue;
 847                 }
 848                 if (!prefixcmp(arg, "--count=")) {
 849                         if (maxcount)
 850                                 die("more than one --count?");
 851                         maxcount = atoi(arg + 8);
 852                         if (maxcount <= 0)
 853                                 die("The number %s did not parse", arg);
 854                         continue;
 855                 }
 856                 if (!prefixcmp(arg, "--sort=")) {
 857                         struct ref_sort *s = xcalloc(1, sizeof(*s));
 858                         int len;
 859
 860                         s->next = NULL;
 861                         *sort_tail = s;
 862                         sort_tail = &s->next;
 863
 864                         arg += 7;
 865                         if (*arg == '-') {
 866                                 s->reverse = 1;
 867                                 arg++;
 868                         }
 869                         len = strlen(arg);
 870                         sort->atom = parse_atom(arg, arg+len);
 871                         continue;
 872                 }
 873                 break;
 874         }
 875         if (quote_style < 0)
 876                 quote_style = QUOTE_NONE;
 877
 878         if (!sort)
 879                 sort = default_sort();
 880         sort_atom_limit = used_atom_cnt;
 881         if (!format)
 882                 format = "%(objectname) %(objecttype)\t%(refname)";
 883
 884         verify_format(format);
 885
 886         memset(&cbdata, 0, sizeof(cbdata));
 887         cbdata.grab_pattern = av + i;
 888         for_each_ref(grab_single_ref, &cbdata);
 889         refs = cbdata.grab_array;
 890         num_refs = cbdata.grab_cnt;
 891
 892         for (i = 0; i < used_atom_cnt; i++) {
 893                 if (used_atom[i][0] == '*') {
 894                         need_tagged = 1;
 895                         break;
 896                 }
 897         }
 898
 899         sort_refs(sort, refs, num_refs);
 900
 901         if (!maxcount || num_refs < maxcount)
 902                 maxcount = num_refs;
 903         for (i = 0; i < maxcount; i++)
 904                 show_ref(refs[i], format, quote_style);
 905         return 0;
 906 }