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 #include "parse-options.h"
  11 #include "remote.h"
  12 #include "color.h"
  13
  14 /* Quoting styles */
  15 #define QUOTE_NONE 0
  16 #define QUOTE_SHELL 1
  17 #define QUOTE_PERL 2
  18 #define QUOTE_PYTHON 4
  19 #define QUOTE_TCL 8
  20
  21 typedef enum { FIELD_STR, FIELD_ULONG, FIELD_TIME } cmp_type;
  22
  23 struct atom_value {
  24         const char *s;
  25         unsigned long ul; /* used for sorting when not FIELD_STR */
  26 };
  27
  28 struct ref_sort {
  29         struct ref_sort *next;
  30         int atom; /* index into used_atom array */
  31         unsigned reverse : 1;
  32 };
  33
  34 struct refinfo {
  35         char *refname;
  36         unsigned char objectname[20];
  37         int flag;
  38         const char *symref;
  39         struct atom_value *value;
  40 };
  41
  42 static struct {
  43         const char *name;
  44         cmp_type cmp_type;
  45 } valid_atom[] = {
  46         { "refname" },
  47         { "objecttype" },
  48         { "objectsize", FIELD_ULONG },
  49         { "objectname" },
  50         { "tree" },
  51         { "parent" },
  52         { "numparent", FIELD_ULONG },
  53         { "object" },
  54         { "type" },
  55         { "tag" },
  56         { "author" },
  57         { "authorname" },
  58         { "authoremail" },
  59         { "authordate", FIELD_TIME },
  60         { "committer" },
  61         { "committername" },
  62         { "committeremail" },
  63         { "committerdate", FIELD_TIME },
  64         { "tagger" },
  65         { "taggername" },
  66         { "taggeremail" },
  67         { "taggerdate", FIELD_TIME },
  68         { "creator" },
  69         { "creatordate", FIELD_TIME },
  70         { "subject" },
  71         { "body" },
  72         { "contents" },
  73         { "contents:subject" },
  74         { "contents:body" },
  75         { "contents:signature" },
  76         { "upstream" },
  77         { "push" },
  78         { "symref" },
  79         { "flag" },
  80         { "HEAD" },
  81         { "color" },
  82 };
  83
  84 /*
  85  * An atom is a valid field atom listed above, possibly prefixed with
  86  * a "*" to denote deref_tag().
  87  *
  88  * We parse given format string and sort specifiers, and make a list
  89  * of properties that we need to extract out of objects.  refinfo
  90  * structure will hold an array of values extracted that can be
  91  * indexed with the "atom number", which is an index into this
  92  * array.
  93  */
  94 static const char **used_atom;
  95 static cmp_type *used_atom_type;
  96 static int used_atom_cnt, need_tagged, need_symref;
  97 static int need_color_reset_at_eol;
  98
  99 /*
 100  * Used to parse format string and sort specifiers
 101  */
 102 static int parse_atom(const char *atom, const char *ep)
 103 {
 104         const char *sp;
 105         int i, at;
 106
 107         sp = atom;
 108         if (*sp == '*' && sp < ep)
 109                 sp++; /* deref */
 110         if (ep <= sp)
 111                 die("malformed field name: %.*s", (int)(ep-atom), atom);
 112
 113         /* Do we have the atom already used elsewhere? */
 114         for (i = 0; i < used_atom_cnt; i++) {
 115                 int len = strlen(used_atom[i]);
 116                 if (len == ep - atom && !memcmp(used_atom[i], atom, len))
 117                         return i;
 118         }
 119
 120         /* Is the atom a valid one? */
 121         for (i = 0; i < ARRAY_SIZE(valid_atom); i++) {
 122                 int len = strlen(valid_atom[i].name);
 123                 /*
 124                  * If the atom name has a colon, strip it and everything after
 125                  * it off - it specifies the format for this entry, and
 126                  * shouldn't be used for checking against the valid_atom
 127                  * table.
 128                  */
 129                 const char *formatp = strchr(sp, ':');
 130                 if (!formatp || ep < formatp)
 131                         formatp = ep;
 132                 if (len == formatp - sp && !memcmp(valid_atom[i].name, sp, len))
 133                         break;
 134         }
 135
 136         if (ARRAY_SIZE(valid_atom) <= i)
 137                 die("unknown field name: %.*s", (int)(ep-atom), atom);
 138
 139         /* Add it in, including the deref prefix */
 140         at = used_atom_cnt;
 141         used_atom_cnt++;
 142         REALLOC_ARRAY(used_atom, used_atom_cnt);
 143         REALLOC_ARRAY(used_atom_type, used_atom_cnt);
 144         used_atom[at] = xmemdupz(atom, ep - atom);
 145         used_atom_type[at] = valid_atom[i].cmp_type;
 146         if (*atom == '*')
 147                 need_tagged = 1;
 148         if (!strcmp(used_atom[at], "symref"))
 149                 need_symref = 1;
 150         return at;
 151 }
 152
 153 /*
 154  * In a format string, find the next occurrence of %(atom).
 155  */
 156 static const char *find_next(const char *cp)
 157 {
 158         while (*cp) {
 159                 if (*cp == '%') {
 160                         /*
 161                          * %( is the start of an atom;
 162                          * %% is a quoted per-cent.
 163                          */
 164                         if (cp[1] == '(')
 165                                 return cp;
 166                         else if (cp[1] == '%')
 167                                 cp++; /* skip over two % */
 168                         /* otherwise this is a singleton, literal % */
 169                 }
 170                 cp++;
 171         }
 172         return NULL;
 173 }
 174
 175 /*
 176  * Make sure the format string is well formed, and parse out
 177  * the used atoms.
 178  */
 179 static int verify_format(const char *format)
 180 {
 181         const char *cp, *sp;
 182
 183         need_color_reset_at_eol = 0;
 184         for (cp = format; *cp && (sp = find_next(cp)); ) {
 185                 const char *color, *ep = strchr(sp, ')');
 186                 int at;
 187
 188                 if (!ep)
 189                         return error("malformed format string %s", sp);
 190                 /* sp points at "%(" and ep points at the closing ")" */
 191                 at = parse_atom(sp + 2, ep);
 192                 cp = ep + 1;
 193
 194                 if (skip_prefix(used_atom[at], "color:", &color))
 195                         need_color_reset_at_eol = !!strcmp(color, "reset");
 196         }
 197         return 0;
 198 }
 199
 200 /*
 201  * Given an object name, read the object data and size, and return a
 202  * "struct object".  If the object data we are returning is also borrowed
 203  * by the "struct object" representation, set *eaten as well---it is a
 204  * signal from parse_object_buffer to us not to free the buffer.
 205  */
 206 static void *get_obj(const unsigned char *sha1, struct object **obj, unsigned long *sz, int *eaten)
 207 {
 208         enum object_type type;
 209         void *buf = read_sha1_file(sha1, &type, sz);
 210
 211         if (buf)
 212                 *obj = parse_object_buffer(sha1, type, *sz, buf, eaten);
 213         else
 214                 *obj = NULL;
 215         return buf;
 216 }
 217
 218 static int grab_objectname(const char *name, const unsigned char *sha1,
 219                             struct atom_value *v)
 220 {
 221         if (!strcmp(name, "objectname")) {
 222                 char *s = xmalloc(41);
 223                 strcpy(s, sha1_to_hex(sha1));
 224                 v->s = s;
 225                 return 1;
 226         }
 227         if (!strcmp(name, "objectname:short")) {
 228                 v->s = xstrdup(find_unique_abbrev(sha1, DEFAULT_ABBREV));
 229                 return 1;
 230         }
 231         return 0;
 232 }
 233
 234 /* See grab_values */
 235 static void grab_common_values(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 236 {
 237         int i;
 238
 239         for (i = 0; i < used_atom_cnt; i++) {
 240                 const char *name = used_atom[i];
 241                 struct atom_value *v = &val[i];
 242                 if (!!deref != (*name == '*'))
 243                         continue;
 244                 if (deref)
 245                         name++;
 246                 if (!strcmp(name, "objecttype"))
 247                         v->s = typename(obj->type);
 248                 else if (!strcmp(name, "objectsize")) {
 249                         char *s = xmalloc(40);
 250                         sprintf(s, "%lu", sz);
 251                         v->ul = sz;
 252                         v->s = s;
 253                 }
 254                 else if (deref)
 255                         grab_objectname(name, obj->sha1, v);
 256         }
 257 }
 258
 259 /* See grab_values */
 260 static void grab_tag_values(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 261 {
 262         int i;
 263         struct tag *tag = (struct tag *) obj;
 264
 265         for (i = 0; i < used_atom_cnt; i++) {
 266                 const char *name = used_atom[i];
 267                 struct atom_value *v = &val[i];
 268                 if (!!deref != (*name == '*'))
 269                         continue;
 270                 if (deref)
 271                         name++;
 272                 if (!strcmp(name, "tag"))
 273                         v->s = tag->tag;
 274                 else if (!strcmp(name, "type") && tag->tagged)
 275                         v->s = typename(tag->tagged->type);
 276                 else if (!strcmp(name, "object") && tag->tagged) {
 277                         char *s = xmalloc(41);
 278                         strcpy(s, sha1_to_hex(tag->tagged->sha1));
 279                         v->s = s;
 280                 }
 281         }
 282 }
 283
 284 /* See grab_values */
 285 static void grab_commit_values(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 286 {
 287         int i;
 288         struct commit *commit = (struct commit *) obj;
 289
 290         for (i = 0; i < used_atom_cnt; i++) {
 291                 const char *name = used_atom[i];
 292                 struct atom_value *v = &val[i];
 293                 if (!!deref != (*name == '*'))
 294                         continue;
 295                 if (deref)
 296                         name++;
 297                 if (!strcmp(name, "tree")) {
 298                         char *s = xmalloc(41);
 299                         strcpy(s, sha1_to_hex(commit->tree->object.sha1));
 300                         v->s = s;
 301                 }
 302                 if (!strcmp(name, "numparent")) {
 303                         char *s = xmalloc(40);
 304                         v->ul = commit_list_count(commit->parents);
 305                         sprintf(s, "%lu", v->ul);
 306                         v->s = s;
 307                 }
 308                 else if (!strcmp(name, "parent")) {
 309                         int num = commit_list_count(commit->parents);
 310                         int i;
 311                         struct commit_list *parents;
 312                         char *s = xmalloc(41 * num + 1);
 313                         v->s = s;
 314                         for (i = 0, parents = commit->parents;
 315                              parents;
 316                              parents = parents->next, i = i + 41) {
 317                                 struct commit *parent = parents->item;
 318                                 strcpy(s+i, sha1_to_hex(parent->object.sha1));
 319                                 if (parents->next)
 320                                         s[i+40] = ' ';
 321                         }
 322                         if (!i)
 323                                 *s = '\0';
 324                 }
 325         }
 326 }
 327
 328 static const char *find_wholine(const char *who, int wholen, const char *buf, unsigned long sz)
 329 {
 330         const char *eol;
 331         while (*buf) {
 332                 if (!strncmp(buf, who, wholen) &&
 333                     buf[wholen] == ' ')
 334                         return buf + wholen + 1;
 335                 eol = strchr(buf, '\n');
 336                 if (!eol)
 337                         return "";
 338                 eol++;
 339                 if (*eol == '\n')
 340                         return ""; /* end of header */
 341                 buf = eol;
 342         }
 343         return "";
 344 }
 345
 346 static const char *copy_line(const char *buf)
 347 {
 348         const char *eol = strchrnul(buf, '\n');
 349         return xmemdupz(buf, eol - buf);
 350 }
 351
 352 static const char *copy_name(const char *buf)
 353 {
 354         const char *cp;
 355         for (cp = buf; *cp && *cp != '\n'; cp++) {
 356                 if (!strncmp(cp, " <", 2))
 357                         return xmemdupz(buf, cp - buf);
 358         }
 359         return "";
 360 }
 361
 362 static const char *copy_email(const char *buf)
 363 {
 364         const char *email = strchr(buf, '<');
 365         const char *eoemail;
 366         if (!email)
 367                 return "";
 368         eoemail = strchr(email, '>');
 369         if (!eoemail)
 370                 return "";
 371         return xmemdupz(email, eoemail + 1 - email);
 372 }
 373
 374 static char *copy_subject(const char *buf, unsigned long len)
 375 {
 376         char *r = xmemdupz(buf, len);
 377         int i;
 378
 379         for (i = 0; i < len; i++)
 380                 if (r[i] == '\n')
 381                         r[i] = ' ';
 382
 383         return r;
 384 }
 385
 386 static void grab_date(const char *buf, struct atom_value *v, const char *atomname)
 387 {
 388         const char *eoemail = strstr(buf, "> ");
 389         char *zone;
 390         unsigned long timestamp;
 391         long tz;
 392         struct date_mode date_mode = { DATE_NORMAL };
 393         const char *formatp;
 394
 395         /*
 396          * We got here because atomname ends in "date" or "date<something>";
 397          * it's not possible that <something> is not ":<format>" because
 398          * parse_atom() wouldn't have allowed it, so we can assume that no
 399          * ":" means no format is specified, and use the default.
 400          */
 401         formatp = strchr(atomname, ':');
 402         if (formatp != NULL) {
 403                 formatp++;
 404                 parse_date_format(formatp, &date_mode);
 405         }
 406
 407         if (!eoemail)
 408                 goto bad;
 409         timestamp = strtoul(eoemail + 2, &zone, 10);
 410         if (timestamp == ULONG_MAX)
 411                 goto bad;
 412         tz = strtol(zone, NULL, 10);
 413         if ((tz == LONG_MIN || tz == LONG_MAX) && errno == ERANGE)
 414                 goto bad;
 415         v->s = xstrdup(show_date(timestamp, tz, &date_mode));
 416         v->ul = timestamp;
 417         return;
 418  bad:
 419         v->s = "";
 420         v->ul = 0;
 421 }
 422
 423 /* See grab_values */
 424 static void grab_person(const char *who, struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 425 {
 426         int i;
 427         int wholen = strlen(who);
 428         const char *wholine = NULL;
 429
 430         for (i = 0; i < used_atom_cnt; i++) {
 431                 const char *name = used_atom[i];
 432                 struct atom_value *v = &val[i];
 433                 if (!!deref != (*name == '*'))
 434                         continue;
 435                 if (deref)
 436                         name++;
 437                 if (strncmp(who, name, wholen))
 438                         continue;
 439                 if (name[wholen] != 0 &&
 440                     strcmp(name + wholen, "name") &&
 441                     strcmp(name + wholen, "email") &&
 442                     !starts_with(name + wholen, "date"))
 443                         continue;
 444                 if (!wholine)
 445                         wholine = find_wholine(who, wholen, buf, sz);
 446                 if (!wholine)
 447                         return; /* no point looking for it */
 448                 if (name[wholen] == 0)
 449                         v->s = copy_line(wholine);
 450                 else if (!strcmp(name + wholen, "name"))
 451                         v->s = copy_name(wholine);
 452                 else if (!strcmp(name + wholen, "email"))
 453                         v->s = copy_email(wholine);
 454                 else if (starts_with(name + wholen, "date"))
 455                         grab_date(wholine, v, name);
 456         }
 457
 458         /*
 459          * For a tag or a commit object, if "creator" or "creatordate" is
 460          * requested, do something special.
 461          */
 462         if (strcmp(who, "tagger") && strcmp(who, "committer"))
 463                 return; /* "author" for commit object is not wanted */
 464         if (!wholine)
 465                 wholine = find_wholine(who, wholen, buf, sz);
 466         if (!wholine)
 467                 return;
 468         for (i = 0; i < used_atom_cnt; i++) {
 469                 const char *name = used_atom[i];
 470                 struct atom_value *v = &val[i];
 471                 if (!!deref != (*name == '*'))
 472                         continue;
 473                 if (deref)
 474                         name++;
 475
 476                 if (starts_with(name, "creatordate"))
 477                         grab_date(wholine, v, name);
 478                 else if (!strcmp(name, "creator"))
 479                         v->s = copy_line(wholine);
 480         }
 481 }
 482
 483 static void find_subpos(const char *buf, unsigned long sz,
 484                         const char **sub, unsigned long *sublen,
 485                         const char **body, unsigned long *bodylen,
 486                         unsigned long *nonsiglen,
 487                         const char **sig, unsigned long *siglen)
 488 {
 489         const char *eol;
 490         /* skip past header until we hit empty line */
 491         while (*buf && *buf != '\n') {
 492                 eol = strchrnul(buf, '\n');
 493                 if (*eol)
 494                         eol++;
 495                 buf = eol;
 496         }
 497         /* skip any empty lines */
 498         while (*buf == '\n')
 499                 buf++;
 500
 501         /* parse signature first; we might not even have a subject line */
 502         *sig = buf + parse_signature(buf, strlen(buf));
 503         *siglen = strlen(*sig);
 504
 505         /* subject is first non-empty line */
 506         *sub = buf;
 507         /* subject goes to first empty line */
 508         while (buf < *sig && *buf && *buf != '\n') {
 509                 eol = strchrnul(buf, '\n');
 510                 if (*eol)
 511                         eol++;
 512                 buf = eol;
 513         }
 514         *sublen = buf - *sub;
 515         /* drop trailing newline, if present */
 516         if (*sublen && (*sub)[*sublen - 1] == '\n')
 517                 *sublen -= 1;
 518
 519         /* skip any empty lines */
 520         while (*buf == '\n')
 521                 buf++;
 522         *body = buf;
 523         *bodylen = strlen(buf);
 524         *nonsiglen = *sig - buf;
 525 }
 526
 527 /* See grab_values */
 528 static void grab_sub_body_contents(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 529 {
 530         int i;
 531         const char *subpos = NULL, *bodypos = NULL, *sigpos = NULL;
 532         unsigned long sublen = 0, bodylen = 0, nonsiglen = 0, siglen = 0;
 533
 534         for (i = 0; i < used_atom_cnt; i++) {
 535                 const char *name = used_atom[i];
 536                 struct atom_value *v = &val[i];
 537                 if (!!deref != (*name == '*'))
 538                         continue;
 539                 if (deref)
 540                         name++;
 541                 if (strcmp(name, "subject") &&
 542                     strcmp(name, "body") &&
 543                     strcmp(name, "contents") &&
 544                     strcmp(name, "contents:subject") &&
 545                     strcmp(name, "contents:body") &&
 546                     strcmp(name, "contents:signature"))
 547                         continue;
 548                 if (!subpos)
 549                         find_subpos(buf, sz,
 550                                     &subpos, &sublen,
 551                                     &bodypos, &bodylen, &nonsiglen,
 552                                     &sigpos, &siglen);
 553
 554                 if (!strcmp(name, "subject"))
 555                         v->s = copy_subject(subpos, sublen);
 556                 else if (!strcmp(name, "contents:subject"))
 557                         v->s = copy_subject(subpos, sublen);
 558                 else if (!strcmp(name, "body"))
 559                         v->s = xmemdupz(bodypos, bodylen);
 560                 else if (!strcmp(name, "contents:body"))
 561                         v->s = xmemdupz(bodypos, nonsiglen);
 562                 else if (!strcmp(name, "contents:signature"))
 563                         v->s = xmemdupz(sigpos, siglen);
 564                 else if (!strcmp(name, "contents"))
 565                         v->s = xstrdup(subpos);
 566         }
 567 }
 568
 569 /*
 570  * We want to have empty print-string for field requests
 571  * that do not apply (e.g. "authordate" for a tag object)
 572  */
 573 static void fill_missing_values(struct atom_value *val)
 574 {
 575         int i;
 576         for (i = 0; i < used_atom_cnt; i++) {
 577                 struct atom_value *v = &val[i];
 578                 if (v->s == NULL)
 579                         v->s = "";
 580         }
 581 }
 582
 583 /*
 584  * val is a list of atom_value to hold returned values.  Extract
 585  * the values for atoms in used_atom array out of (obj, buf, sz).
 586  * when deref is false, (obj, buf, sz) is the object that is
 587  * pointed at by the ref itself; otherwise it is the object the
 588  * ref (which is a tag) refers to.
 589  */
 590 static void grab_values(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 591 {
 592         grab_common_values(val, deref, obj, buf, sz);
 593         switch (obj->type) {
 594         case OBJ_TAG:
 595                 grab_tag_values(val, deref, obj, buf, sz);
 596                 grab_sub_body_contents(val, deref, obj, buf, sz);
 597                 grab_person("tagger", val, deref, obj, buf, sz);
 598                 break;
 599         case OBJ_COMMIT:
 600                 grab_commit_values(val, deref, obj, buf, sz);
 601                 grab_sub_body_contents(val, deref, obj, buf, sz);
 602                 grab_person("author", val, deref, obj, buf, sz);
 603                 grab_person("committer", val, deref, obj, buf, sz);
 604                 break;
 605         case OBJ_TREE:
 606                 /* grab_tree_values(val, deref, obj, buf, sz); */
 607                 break;
 608         case OBJ_BLOB:
 609                 /* grab_blob_values(val, deref, obj, buf, sz); */
 610                 break;
 611         default:
 612                 die("Eh?  Object of type %d?", obj->type);
 613         }
 614 }
 615
 616 static inline char *copy_advance(char *dst, const char *src)
 617 {
 618         while (*src)
 619                 *dst++ = *src++;
 620         return dst;
 621 }
 622
 623 /*
 624  * Parse the object referred by ref, and grab needed value.
 625  */
 626 static void populate_value(struct refinfo *ref)
 627 {
 628         void *buf;
 629         struct object *obj;
 630         int eaten, i;
 631         unsigned long size;
 632         const unsigned char *tagged;
 633
 634         ref->value = xcalloc(used_atom_cnt, sizeof(struct atom_value));
 635
 636         if (need_symref && (ref->flag & REF_ISSYMREF) && !ref->symref) {
 637                 unsigned char unused1[20];
 638                 ref->symref = resolve_refdup(ref->refname, RESOLVE_REF_READING,
 639                                              unused1, NULL);
 640                 if (!ref->symref)
 641                         ref->symref = "";
 642         }
 643
 644         /* Fill in specials first */
 645         for (i = 0; i < used_atom_cnt; i++) {
 646                 const char *name = used_atom[i];
 647                 struct atom_value *v = &ref->value[i];
 648                 int deref = 0;
 649                 const char *refname;
 650                 const char *formatp;
 651                 struct branch *branch = NULL;
 652
 653                 if (*name == '*') {
 654                         deref = 1;
 655                         name++;
 656                 }
 657
 658                 if (starts_with(name, "refname"))
 659                         refname = ref->refname;
 660                 else if (starts_with(name, "symref"))
 661                         refname = ref->symref ? ref->symref : "";
 662                 else if (starts_with(name, "upstream")) {
 663                         const char *branch_name;
 664                         /* only local branches may have an upstream */
 665                         if (!skip_prefix(ref->refname, "refs/heads/",
 666                                          &branch_name))
 667                                 continue;
 668                         branch = branch_get(branch_name);
 669
 670                         refname = branch_get_upstream(branch, NULL);
 671                         if (!refname)
 672                                 continue;
 673                 } else if (starts_with(name, "push")) {
 674                         const char *branch_name;
 675                         if (!skip_prefix(ref->refname, "refs/heads/",
 676                                          &branch_name))
 677                                 continue;
 678                         branch = branch_get(branch_name);
 679
 680                         refname = branch_get_push(branch, NULL);
 681                         if (!refname)
 682                                 continue;
 683                 } else if (starts_with(name, "color:")) {
 684                         char color[COLOR_MAXLEN] = "";
 685
 686                         if (color_parse(name + 6, color) < 0)
 687                                 die(_("unable to parse format"));
 688                         v->s = xstrdup(color);
 689                         continue;
 690                 } else if (!strcmp(name, "flag")) {
 691                         char buf[256], *cp = buf;
 692                         if (ref->flag & REF_ISSYMREF)
 693                                 cp = copy_advance(cp, ",symref");
 694                         if (ref->flag & REF_ISPACKED)
 695                                 cp = copy_advance(cp, ",packed");
 696                         if (cp == buf)
 697                                 v->s = "";
 698                         else {
 699                                 *cp = '\0';
 700                                 v->s = xstrdup(buf + 1);
 701                         }
 702                         continue;
 703                 } else if (!deref && grab_objectname(name, ref->objectname, v)) {
 704                         continue;
 705                 } else if (!strcmp(name, "HEAD")) {
 706                         const char *head;
 707                         unsigned char sha1[20];
 708
 709                         head = resolve_ref_unsafe("HEAD", RESOLVE_REF_READING,
 710                                                   sha1, NULL);
 711                         if (!strcmp(ref->refname, head))
 712                                 v->s = "*";
 713                         else
 714                                 v->s = " ";
 715                         continue;
 716                 } else
 717                         continue;
 718
 719                 formatp = strchr(name, ':');
 720                 if (formatp) {
 721                         int num_ours, num_theirs;
 722
 723                         formatp++;
 724                         if (!strcmp(formatp, "short"))
 725                                 refname = shorten_unambiguous_ref(refname,
 726                                                       warn_ambiguous_refs);
 727                         else if (!strcmp(formatp, "track") &&
 728                                  (starts_with(name, "upstream") ||
 729                                   starts_with(name, "push"))) {
 730                                 char buf[40];
 731
 732                                 if (stat_tracking_info(branch, &num_ours,
 733                                                        &num_theirs, NULL))
 734                                         continue;
 735
 736                                 if (!num_ours && !num_theirs)
 737                                         v->s = "";
 738                                 else if (!num_ours) {
 739                                         sprintf(buf, "[behind %d]", num_theirs);
 740                                         v->s = xstrdup(buf);
 741                                 } else if (!num_theirs) {
 742                                         sprintf(buf, "[ahead %d]", num_ours);
 743                                         v->s = xstrdup(buf);
 744                                 } else {
 745                                         sprintf(buf, "[ahead %d, behind %d]",
 746                                                 num_ours, num_theirs);
 747                                         v->s = xstrdup(buf);
 748                                 }
 749                                 continue;
 750                         } else if (!strcmp(formatp, "trackshort") &&
 751                                    (starts_with(name, "upstream") ||
 752                                     starts_with(name, "push"))) {
 753                                 assert(branch);
 754
 755                                 if (stat_tracking_info(branch, &num_ours,
 756                                                         &num_theirs, NULL))
 757                                         continue;
 758
 759                                 if (!num_ours && !num_theirs)
 760                                         v->s = "=";
 761                                 else if (!num_ours)
 762                                         v->s = "<";
 763                                 else if (!num_theirs)
 764                                         v->s = ">";
 765                                 else
 766                                         v->s = "<>";
 767                                 continue;
 768                         } else
 769                                 die("unknown %.*s format %s",
 770                                     (int)(formatp - name), name, formatp);
 771                 }
 772
 773                 if (!deref)
 774                         v->s = refname;
 775                 else {
 776                         int len = strlen(refname);
 777                         char *s = xmalloc(len + 4);
 778                         sprintf(s, "%s^{}", refname);
 779                         v->s = s;
 780                 }
 781         }
 782
 783         for (i = 0; i < used_atom_cnt; i++) {
 784                 struct atom_value *v = &ref->value[i];
 785                 if (v->s == NULL)
 786                         goto need_obj;
 787         }
 788         return;
 789
 790  need_obj:
 791         buf = get_obj(ref->objectname, &obj, &size, &eaten);
 792         if (!buf)
 793                 die("missing object %s for %s",
 794                     sha1_to_hex(ref->objectname), ref->refname);
 795         if (!obj)
 796                 die("parse_object_buffer failed on %s for %s",
 797                     sha1_to_hex(ref->objectname), ref->refname);
 798
 799         grab_values(ref->value, 0, obj, buf, size);
 800         if (!eaten)
 801                 free(buf);
 802
 803         /*
 804          * If there is no atom that wants to know about tagged
 805          * object, we are done.
 806          */
 807         if (!need_tagged || (obj->type != OBJ_TAG))
 808                 return;
 809
 810         /*
 811          * If it is a tag object, see if we use a value that derefs
 812          * the object, and if we do grab the object it refers to.
 813          */
 814         tagged = ((struct tag *)obj)->tagged->sha1;
 815
 816         /*
 817          * NEEDSWORK: This derefs tag only once, which
 818          * is good to deal with chains of trust, but
 819          * is not consistent with what deref_tag() does
 820          * which peels the onion to the core.
 821          */
 822         buf = get_obj(tagged, &obj, &size, &eaten);
 823         if (!buf)
 824                 die("missing object %s for %s",
 825                     sha1_to_hex(tagged), ref->refname);
 826         if (!obj)
 827                 die("parse_object_buffer failed on %s for %s",
 828                     sha1_to_hex(tagged), ref->refname);
 829         grab_values(ref->value, 1, obj, buf, size);
 830         if (!eaten)
 831                 free(buf);
 832 }
 833
 834 /*
 835  * Given a ref, return the value for the atom.  This lazily gets value
 836  * out of the object by calling populate value.
 837  */
 838 static void get_value(struct refinfo *ref, int atom, struct atom_value **v)
 839 {
 840         if (!ref->value) {
 841                 populate_value(ref);
 842                 fill_missing_values(ref->value);
 843         }
 844         *v = &ref->value[atom];
 845 }
 846
 847 struct grab_ref_cbdata {
 848         struct refinfo **grab_array;
 849         const char **grab_pattern;
 850         int grab_cnt;
 851 };
 852
 853 /*
 854  * A call-back given to for_each_ref().  Filter refs and keep them for
 855  * later object processing.
 856  */
 857 static int grab_single_ref(const char *refname, const struct object_id *oid,
 858                            int flag, void *cb_data)
 859 {
 860         struct grab_ref_cbdata *cb = cb_data;
 861         struct refinfo *ref;
 862         int cnt;
 863
 864         if (flag & REF_BAD_NAME) {
 865                   warning("ignoring ref with broken name %s", refname);
 866                   return 0;
 867         }
 868
 869         if (flag & REF_ISBROKEN) {
 870                   warning("ignoring broken ref %s", refname);
 871                   return 0;
 872         }
 873
 874         if (*cb->grab_pattern) {
 875                 const char **pattern;
 876                 int namelen = strlen(refname);
 877                 for (pattern = cb->grab_pattern; *pattern; pattern++) {
 878                         const char *p = *pattern;
 879                         int plen = strlen(p);
 880
 881                         if ((plen <= namelen) &&
 882                             !strncmp(refname, p, plen) &&
 883                             (refname[plen] == '\0' ||
 884                              refname[plen] == '/' ||
 885                              p[plen-1] == '/'))
 886                                 break;
 887                         if (!wildmatch(p, refname, WM_PATHNAME, NULL))
 888                                 break;
 889                 }
 890                 if (!*pattern)
 891                         return 0;
 892         }
 893
 894         /*
 895          * We do not open the object yet; sort may only need refname
 896          * to do its job and the resulting list may yet to be pruned
 897          * by maxcount logic.
 898          */
 899         ref = xcalloc(1, sizeof(*ref));
 900         ref->refname = xstrdup(refname);
 901         hashcpy(ref->objectname, oid->hash);
 902         ref->flag = flag;
 903
 904         cnt = cb->grab_cnt;
 905         REALLOC_ARRAY(cb->grab_array, cnt + 1);
 906         cb->grab_array[cnt++] = ref;
 907         cb->grab_cnt = cnt;
 908         return 0;
 909 }
 910
 911 static int cmp_ref_sort(struct ref_sort *s, struct refinfo *a, struct refinfo *b)
 912 {
 913         struct atom_value *va, *vb;
 914         int cmp;
 915         cmp_type cmp_type = used_atom_type[s->atom];
 916
 917         get_value(a, s->atom, &va);
 918         get_value(b, s->atom, &vb);
 919         switch (cmp_type) {
 920         case FIELD_STR:
 921                 cmp = strcmp(va->s, vb->s);
 922                 break;
 923         default:
 924                 if (va->ul < vb->ul)
 925                         cmp = -1;
 926                 else if (va->ul == vb->ul)
 927                         cmp = 0;
 928                 else
 929                         cmp = 1;
 930                 break;
 931         }
 932         return (s->reverse) ? -cmp : cmp;
 933 }
 934
 935 static struct ref_sort *ref_sort;
 936 static int compare_refs(const void *a_, const void *b_)
 937 {
 938         struct refinfo *a = *((struct refinfo **)a_);
 939         struct refinfo *b = *((struct refinfo **)b_);
 940         struct ref_sort *s;
 941
 942         for (s = ref_sort; s; s = s->next) {
 943                 int cmp = cmp_ref_sort(s, a, b);
 944                 if (cmp)
 945                         return cmp;
 946         }
 947         return 0;
 948 }
 949
 950 static void sort_refs(struct ref_sort *sort, struct refinfo **refs, int num_refs)
 951 {
 952         ref_sort = sort;
 953         qsort(refs, num_refs, sizeof(struct refinfo *), compare_refs);
 954 }
 955
 956 static void print_value(struct atom_value *v, int quote_style)
 957 {
 958         struct strbuf sb = STRBUF_INIT;
 959         switch (quote_style) {
 960         case QUOTE_NONE:
 961                 fputs(v->s, stdout);
 962                 break;
 963         case QUOTE_SHELL:
 964                 sq_quote_buf(&sb, v->s);
 965                 break;
 966         case QUOTE_PERL:
 967                 perl_quote_buf(&sb, v->s);
 968                 break;
 969         case QUOTE_PYTHON:
 970                 python_quote_buf(&sb, v->s);
 971                 break;
 972         case QUOTE_TCL:
 973                 tcl_quote_buf(&sb, v->s);
 974                 break;
 975         }
 976         if (quote_style != QUOTE_NONE) {
 977                 fputs(sb.buf, stdout);
 978                 strbuf_release(&sb);
 979         }
 980 }
 981
 982 static int hex1(char ch)
 983 {
 984         if ('0' <= ch && ch <= '9')
 985                 return ch - '0';
 986         else if ('a' <= ch && ch <= 'f')
 987                 return ch - 'a' + 10;
 988         else if ('A' <= ch && ch <= 'F')
 989                 return ch - 'A' + 10;
 990         return -1;
 991 }
 992 static int hex2(const char *cp)
 993 {
 994         if (cp[0] && cp[1])
 995                 return (hex1(cp[0]) << 4) | hex1(cp[1]);
 996         else
 997                 return -1;
 998 }
 999
1000 static void emit(const char *cp, const char *ep)
1001 {
1002         while (*cp && (!ep || cp < ep)) {
1003                 if (*cp == '%') {
1004                         if (cp[1] == '%')
1005                                 cp++;
1006                         else {
1007                                 int ch = hex2(cp + 1);
1008                                 if (0 <= ch) {
1009                                         putchar(ch);
1010                                         cp += 3;
1011                                         continue;
1012                                 }
1013                         }
1014                 }
1015                 putchar(*cp);
1016                 cp++;
1017         }
1018 }
1019
1020 static void show_ref(struct refinfo *info, const char *format, int quote_style)
1021 {
1022         const char *cp, *sp, *ep;
1023
1024         for (cp = format; *cp && (sp = find_next(cp)); cp = ep + 1) {
1025                 struct atom_value *atomv;
1026
1027                 ep = strchr(sp, ')');
1028                 if (cp < sp)
1029                         emit(cp, sp);
1030                 get_value(info, parse_atom(sp + 2, ep), &atomv);
1031                 print_value(atomv, quote_style);
1032         }
1033         if (*cp) {
1034                 sp = cp + strlen(cp);
1035                 emit(cp, sp);
1036         }
1037         if (need_color_reset_at_eol) {
1038                 struct atom_value resetv;
1039                 char color[COLOR_MAXLEN] = "";
1040
1041                 if (color_parse("reset", color) < 0)
1042                         die("BUG: couldn't parse 'reset' as a color");
1043                 resetv.s = color;
1044                 print_value(&resetv, quote_style);
1045         }
1046         putchar('\n');
1047 }
1048
1049 static struct ref_sort *default_sort(void)
1050 {
1051         static const char cstr_name[] = "refname";
1052
1053         struct ref_sort *sort = xcalloc(1, sizeof(*sort));
1054
1055         sort->next = NULL;
1056         sort->atom = parse_atom(cstr_name, cstr_name + strlen(cstr_name));
1057         return sort;
1058 }
1059
1060 static int opt_parse_sort(const struct option *opt, const char *arg, int unset)
1061 {
1062         struct ref_sort **sort_tail = opt->value;
1063         struct ref_sort *s;
1064         int len;
1065
1066         if (!arg) /* should --no-sort void the list ? */
1067                 return -1;
1068
1069         s = xcalloc(1, sizeof(*s));
1070         s->next = *sort_tail;
1071         *sort_tail = s;
1072
1073         if (*arg == '-') {
1074                 s->reverse = 1;
1075                 arg++;
1076         }
1077         len = strlen(arg);
1078         s->atom = parse_atom(arg, arg+len);
1079         return 0;
1080 }
1081
1082 static char const * const for_each_ref_usage[] = {
1083         N_("git for-each-ref [<options>] [<pattern>]"),
1084         NULL
1085 };
1086
1087 int cmd_for_each_ref(int argc, const char **argv, const char *prefix)
1088 {
1089         int i, num_refs;
1090         const char *format = "%(objectname) %(objecttype)\t%(refname)";
1091         struct ref_sort *sort = NULL, **sort_tail = &sort;
1092         int maxcount = 0, quote_style = 0;
1093         struct refinfo **refs;
1094         struct grab_ref_cbdata cbdata;
1095
1096         struct option opts[] = {
1097                 OPT_BIT('s', "shell", &quote_style,
1098                         N_("quote placeholders suitably for shells"), QUOTE_SHELL),
1099                 OPT_BIT('p', "perl",  &quote_style,
1100                         N_("quote placeholders suitably for perl"), QUOTE_PERL),
1101                 OPT_BIT(0 , "python", &quote_style,
1102                         N_("quote placeholders suitably for python"), QUOTE_PYTHON),
1103                 OPT_BIT(0 , "tcl",  &quote_style,
1104                         N_("quote placeholders suitably for Tcl"), QUOTE_TCL),
1105
1106                 OPT_GROUP(""),
1107                 OPT_INTEGER( 0 , "count", &maxcount, N_("show only <n> matched refs")),
1108                 OPT_STRING(  0 , "format", &format, N_("format"), N_("format to use for the output")),
1109                 OPT_CALLBACK(0 , "sort", sort_tail, N_("key"),
1110                             N_("field name to sort on"), &opt_parse_sort),
1111                 OPT_END(),
1112         };
1113
1114         parse_options(argc, argv, prefix, opts, for_each_ref_usage, 0);
1115         if (maxcount < 0) {
1116                 error("invalid --count argument: `%d'", maxcount);
1117                 usage_with_options(for_each_ref_usage, opts);
1118         }
1119         if (HAS_MULTI_BITS(quote_style)) {
1120                 error("more than one quoting style?");
1121                 usage_with_options(for_each_ref_usage, opts);
1122         }
1123         if (verify_format(format))
1124                 usage_with_options(for_each_ref_usage, opts);
1125
1126         if (!sort)
1127                 sort = default_sort();
1128
1129         /* for warn_ambiguous_refs */
1130         git_config(git_default_config, NULL);
1131
1132         memset(&cbdata, 0, sizeof(cbdata));
1133         cbdata.grab_pattern = argv;
1134         for_each_rawref(grab_single_ref, &cbdata);
1135         refs = cbdata.grab_array;
1136         num_refs = cbdata.grab_cnt;
1137
1138         sort_refs(sort, refs, num_refs);
1139
1140         if (!maxcount || num_refs < maxcount)
1141                 maxcount = num_refs;
1142         for (i = 0; i < maxcount; i++)
1143                 show_ref(refs[i], format, quote_style);
1144         return 0;
1145 }