ref-filter.c

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