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