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