git.oblomov.eu Git - git/blob - 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 #include "revision.h"
  13 #include "utf8.h"
  14 #include "git-compat-util.h"
  15 #include "version.h"
  16
  17 typedef enum { FIELD_STR, FIELD_ULONG, FIELD_TIME } cmp_type;
  18
  19 static struct {
  20         const char *name;
  21         cmp_type cmp_type;
  22 } valid_atom[] = {
  23         { "refname" },
  24         { "objecttype" },
  25         { "objectsize", FIELD_ULONG },
  26         { "objectname" },
  27         { "tree" },
  28         { "parent" },
  29         { "numparent", FIELD_ULONG },
  30         { "object" },
  31         { "type" },
  32         { "tag" },
  33         { "author" },
  34         { "authorname" },
  35         { "authoremail" },
  36         { "authordate", FIELD_TIME },
  37         { "committer" },
  38         { "committername" },
  39         { "committeremail" },
  40         { "committerdate", FIELD_TIME },
  41         { "tagger" },
  42         { "taggername" },
  43         { "taggeremail" },
  44         { "taggerdate", FIELD_TIME },
  45         { "creator" },
  46         { "creatordate", FIELD_TIME },
  47         { "subject" },
  48         { "body" },
  49         { "contents" },
  50         { "upstream" },
  51         { "push" },
  52         { "symref" },
  53         { "flag" },
  54         { "HEAD" },
  55         { "color" },
  56         { "align" },
  57         { "end" },
  58 };
  59
  60 #define REF_FORMATTING_STATE_INIT  { 0, NULL }
  61
  62 struct align {
  63         align_type position;
  64         unsigned int width;
  65 };
  66
  67 struct contents {
  68         unsigned int lines;
  69         struct object_id oid;
  70 };
  71
  72 struct ref_formatting_stack {
  73         struct ref_formatting_stack *prev;
  74         struct strbuf output;
  75         void (*at_end)(struct ref_formatting_stack *stack);
  76         void *at_end_data;
  77 };
  78
  79 struct ref_formatting_state {
  80         int quote_style;
  81         struct ref_formatting_stack *stack;
  82 };
  83
  84 struct atom_value {
  85         const char *s;
  86         union {
  87                 struct align align;
  88                 struct contents contents;
  89         } u;
  90         void (*handler)(struct atom_value *atomv, struct ref_formatting_state *state);
  91         unsigned long ul; /* used for sorting when not FIELD_STR */
  92 };
  93
  94 /*
  95  * An atom is a valid field atom listed above, possibly prefixed with
  96  * a "*" to denote deref_tag().
  97  *
  98  * We parse given format string and sort specifiers, and make a list
  99  * of properties that we need to extract out of objects.  ref_array_item
 100  * structure will hold an array of values extracted that can be
 101  * indexed with the "atom number", which is an index into this
 102  * array.
 103  */
 104 static const char **used_atom;
 105 static cmp_type *used_atom_type;
 106 static int used_atom_cnt, need_tagged, need_symref;
 107 static int need_color_reset_at_eol;
 108
 109 /*
 110  * Used to parse format string and sort specifiers
 111  */
 112 int parse_ref_filter_atom(const char *atom, const char *ep)
 113 {
 114         const char *sp;
 115         int i, at;
 116
 117         sp = atom;
 118         if (*sp == '*' && sp < ep)
 119                 sp++; /* deref */
 120         if (ep <= sp)
 121                 die("malformed field name: %.*s", (int)(ep-atom), atom);
 122
 123         /* Do we have the atom already used elsewhere? */
 124         for (i = 0; i < used_atom_cnt; i++) {
 125                 int len = strlen(used_atom[i]);
 126                 if (len == ep - atom && !memcmp(used_atom[i], atom, len))
 127                         return i;
 128         }
 129
 130         /* Is the atom a valid one? */
 131         for (i = 0; i < ARRAY_SIZE(valid_atom); i++) {
 132                 int len = strlen(valid_atom[i].name);
 133                 /*
 134                  * If the atom name has a colon, strip it and everything after
 135                  * it off - it specifies the format for this entry, and
 136                  * shouldn't be used for checking against the valid_atom
 137                  * table.
 138                  */
 139                 const char *formatp = strchr(sp, ':');
 140                 if (!formatp || ep < formatp)
 141                         formatp = ep;
 142                 if (len == formatp - sp && !memcmp(valid_atom[i].name, sp, len))
 143                         break;
 144         }
 145
 146         if (ARRAY_SIZE(valid_atom) <= i)
 147                 die("unknown field name: %.*s", (int)(ep-atom), atom);
 148
 149         /* Add it in, including the deref prefix */
 150         at = used_atom_cnt;
 151         used_atom_cnt++;
 152         REALLOC_ARRAY(used_atom, used_atom_cnt);
 153         REALLOC_ARRAY(used_atom_type, used_atom_cnt);
 154         used_atom[at] = xmemdupz(atom, ep - atom);
 155         used_atom_type[at] = valid_atom[i].cmp_type;
 156         if (*atom == '*')
 157                 need_tagged = 1;
 158         if (!strcmp(used_atom[at], "symref"))
 159                 need_symref = 1;
 160         return at;
 161 }
 162
 163 static void quote_formatting(struct strbuf *s, const char *str, int quote_style)
 164 {
 165         switch (quote_style) {
 166         case QUOTE_NONE:
 167                 strbuf_addstr(s, str);
 168                 break;
 169         case QUOTE_SHELL:
 170                 sq_quote_buf(s, str);
 171                 break;
 172         case QUOTE_PERL:
 173                 perl_quote_buf(s, str);
 174                 break;
 175         case QUOTE_PYTHON:
 176                 python_quote_buf(s, str);
 177                 break;
 178         case QUOTE_TCL:
 179                 tcl_quote_buf(s, str);
 180                 break;
 181         }
 182 }
 183
 184 static void append_atom(struct atom_value *v, struct ref_formatting_state *state)
 185 {
 186         /*
 187          * Quote formatting is only done when the stack has a single
 188          * element. Otherwise quote formatting is done on the
 189          * element's entire output strbuf when the %(end) atom is
 190          * encountered.
 191          */
 192         if (!state->stack->prev)
 193                 quote_formatting(&state->stack->output, v->s, state->quote_style);
 194         else
 195                 strbuf_addstr(&state->stack->output, v->s);
 196 }
 197
 198 static void push_stack_element(struct ref_formatting_stack **stack)
 199 {
 200         struct ref_formatting_stack *s = xcalloc(1, sizeof(struct ref_formatting_stack));
 201
 202         strbuf_init(&s->output, 0);
 203         s->prev = *stack;
 204         *stack = s;
 205 }
 206
 207 static void pop_stack_element(struct ref_formatting_stack **stack)
 208 {
 209         struct ref_formatting_stack *current = *stack;
 210         struct ref_formatting_stack *prev = current->prev;
 211
 212         if (prev)
 213                 strbuf_addbuf(&prev->output, &current->output);
 214         strbuf_release(&current->output);
 215         free(current);
 216         *stack = prev;
 217 }
 218
 219 static void end_align_handler(struct ref_formatting_stack *stack)
 220 {
 221         struct align *align = (struct align *)stack->at_end_data;
 222         struct strbuf s = STRBUF_INIT;
 223
 224         strbuf_utf8_align(&s, align->position, align->width, stack->output.buf);
 225         strbuf_swap(&stack->output, &s);
 226         strbuf_release(&s);
 227 }
 228
 229 static void align_atom_handler(struct atom_value *atomv, struct ref_formatting_state *state)
 230 {
 231         struct ref_formatting_stack *new;
 232
 233         push_stack_element(&state->stack);
 234         new = state->stack;
 235         new->at_end = end_align_handler;
 236         new->at_end_data = &atomv->u.align;
 237 }
 238
 239 static void end_atom_handler(struct atom_value *atomv, struct ref_formatting_state *state)
 240 {
 241         struct ref_formatting_stack *current = state->stack;
 242         struct strbuf s = STRBUF_INIT;
 243
 244         if (!current->at_end)
 245                 die(_("format: %%(end) atom used without corresponding atom"));
 246         current->at_end(current);
 247
 248         /*
 249          * Perform quote formatting when the stack element is that of
 250          * a supporting atom. If nested then perform quote formatting
 251          * only on the topmost supporting atom.
 252          */
 253         if (!state->stack->prev->prev) {
 254                 quote_formatting(&s, current->output.buf, state->quote_style);
 255                 strbuf_swap(&current->output, &s);
 256         }
 257         strbuf_release(&s);
 258         pop_stack_element(&state->stack);
 259 }
 260
 261 static int match_atom_name(const char *name, const char *atom_name, const char **val)
 262 {
 263         const char *body;
 264
 265         if (!skip_prefix(name, atom_name, &body))
 266                 return 0; /* doesn't even begin with "atom_name" */
 267         if (!body[0]) {
 268                 *val = NULL; /* %(atom_name) and no customization */
 269                 return 1;
 270         }
 271         if (body[0] != ':')
 272                 return 0; /* "atom_namefoo" is not "atom_name" or "atom_name:..." */
 273         *val = body + 1; /* "atom_name:val" */
 274         return 1;
 275 }
 276
 277 /*
 278  * In a format string, find the next occurrence of %(atom).
 279  */
 280 static const char *find_next(const char *cp)
 281 {
 282         while (*cp) {
 283                 if (*cp == '%') {
 284                         /*
 285                          * %( is the start of an atom;
 286                          * %% is a quoted per-cent.
 287                          */
 288                         if (cp[1] == '(')
 289                                 return cp;
 290                         else if (cp[1] == '%')
 291                                 cp++; /* skip over two % */
 292                         /* otherwise this is a singleton, literal % */
 293                 }
 294                 cp++;
 295         }
 296         return NULL;
 297 }
 298
 299 /*
 300  * Make sure the format string is well formed, and parse out
 301  * the used atoms.
 302  */
 303 int verify_ref_format(const char *format)
 304 {
 305         const char *cp, *sp;
 306
 307         need_color_reset_at_eol = 0;
 308         for (cp = format; *cp && (sp = find_next(cp)); ) {
 309                 const char *color, *ep = strchr(sp, ')');
 310                 int at;
 311
 312                 if (!ep)
 313                         return error("malformed format string %s", sp);
 314                 /* sp points at "%(" and ep points at the closing ")" */
 315                 at = parse_ref_filter_atom(sp + 2, ep);
 316                 cp = ep + 1;
 317
 318                 if (skip_prefix(used_atom[at], "color:", &color))
 319                         need_color_reset_at_eol = !!strcmp(color, "reset");
 320         }
 321         return 0;
 322 }
 323
 324 /*
 325  * Given an object name, read the object data and size, and return a
 326  * "struct object".  If the object data we are returning is also borrowed
 327  * by the "struct object" representation, set *eaten as well---it is a
 328  * signal from parse_object_buffer to us not to free the buffer.
 329  */
 330 static void *get_obj(const unsigned char *sha1, struct object **obj, unsigned long *sz, int *eaten)
 331 {
 332         enum object_type type;
 333         void *buf = read_sha1_file(sha1, &type, sz);
 334
 335         if (buf)
 336                 *obj = parse_object_buffer(sha1, type, *sz, buf, eaten);
 337         else
 338                 *obj = NULL;
 339         return buf;
 340 }
 341
 342 static int grab_objectname(const char *name, const unsigned char *sha1,
 343                             struct atom_value *v)
 344 {
 345         if (!strcmp(name, "objectname")) {
 346                 v->s = xstrdup(sha1_to_hex(sha1));
 347                 return 1;
 348         }
 349         if (!strcmp(name, "objectname:short")) {
 350                 v->s = xstrdup(find_unique_abbrev(sha1, DEFAULT_ABBREV));
 351                 return 1;
 352         }
 353         return 0;
 354 }
 355
 356 /* See grab_values */
 357 static void grab_common_values(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 358 {
 359         int i;
 360
 361         for (i = 0; i < used_atom_cnt; i++) {
 362                 const char *name = used_atom[i];
 363                 struct atom_value *v = &val[i];
 364                 if (!!deref != (*name == '*'))
 365                         continue;
 366                 if (deref)
 367                         name++;
 368                 if (!strcmp(name, "objecttype"))
 369                         v->s = typename(obj->type);
 370                 else if (!strcmp(name, "objectsize")) {
 371                         v->ul = sz;
 372                         v->s = xstrfmt("%lu", sz);
 373                 }
 374                 else if (deref)
 375                         grab_objectname(name, obj->oid.hash, v);
 376         }
 377 }
 378
 379 /* See grab_values */
 380 static void grab_tag_values(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 381 {
 382         int i;
 383         struct tag *tag = (struct tag *) obj;
 384
 385         for (i = 0; i < used_atom_cnt; i++) {
 386                 const char *name = used_atom[i];
 387                 struct atom_value *v = &val[i];
 388                 if (!!deref != (*name == '*'))
 389                         continue;
 390                 if (deref)
 391                         name++;
 392                 if (!strcmp(name, "tag"))
 393                         v->s = tag->tag;
 394                 else if (!strcmp(name, "type") && tag->tagged)
 395                         v->s = typename(tag->tagged->type);
 396                 else if (!strcmp(name, "object") && tag->tagged)
 397                         v->s = xstrdup(oid_to_hex(&tag->tagged->oid));
 398         }
 399 }
 400
 401 /* See grab_values */
 402 static void grab_commit_values(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 403 {
 404         int i;
 405         struct commit *commit = (struct commit *) obj;
 406
 407         for (i = 0; i < used_atom_cnt; i++) {
 408                 const char *name = used_atom[i];
 409                 struct atom_value *v = &val[i];
 410                 if (!!deref != (*name == '*'))
 411                         continue;
 412                 if (deref)
 413                         name++;
 414                 if (!strcmp(name, "tree")) {
 415                         v->s = xstrdup(oid_to_hex(&commit->tree->object.oid));
 416                 }
 417                 else if (!strcmp(name, "numparent")) {
 418                         v->ul = commit_list_count(commit->parents);
 419                         v->s = xstrfmt("%lu", v->ul);
 420                 }
 421                 else if (!strcmp(name, "parent")) {
 422                         struct commit_list *parents;
 423                         struct strbuf s = STRBUF_INIT;
 424                         for (parents = commit->parents; parents; parents = parents->next) {
 425                                 struct commit *parent = parents->item;
 426                                 if (parents != commit->parents)
 427                                         strbuf_addch(&s, ' ');
 428                                 strbuf_addstr(&s, oid_to_hex(&parent->object.oid));
 429                         }
 430                         v->s = strbuf_detach(&s, NULL);
 431                 }
 432         }
 433 }
 434
 435 static const char *find_wholine(const char *who, int wholen, const char *buf, unsigned long sz)
 436 {
 437         const char *eol;
 438         while (*buf) {
 439                 if (!strncmp(buf, who, wholen) &&
 440                     buf[wholen] == ' ')
 441                         return buf + wholen + 1;
 442                 eol = strchr(buf, '\n');
 443                 if (!eol)
 444                         return "";
 445                 eol++;
 446                 if (*eol == '\n')
 447                         return ""; /* end of header */
 448                 buf = eol;
 449         }
 450         return "";
 451 }
 452
 453 static const char *copy_line(const char *buf)
 454 {
 455         const char *eol = strchrnul(buf, '\n');
 456         return xmemdupz(buf, eol - buf);
 457 }
 458
 459 static const char *copy_name(const char *buf)
 460 {
 461         const char *cp;
 462         for (cp = buf; *cp && *cp != '\n'; cp++) {
 463                 if (!strncmp(cp, " <", 2))
 464                         return xmemdupz(buf, cp - buf);
 465         }
 466         return "";
 467 }
 468
 469 static const char *copy_email(const char *buf)
 470 {
 471         const char *email = strchr(buf, '<');
 472         const char *eoemail;
 473         if (!email)
 474                 return "";
 475         eoemail = strchr(email, '>');
 476         if (!eoemail)
 477                 return "";
 478         return xmemdupz(email, eoemail + 1 - email);
 479 }
 480
 481 static char *copy_subject(const char *buf, unsigned long len)
 482 {
 483         char *r = xmemdupz(buf, len);
 484         int i;
 485
 486         for (i = 0; i < len; i++)
 487                 if (r[i] == '\n')
 488                         r[i] = ' ';
 489
 490         return r;
 491 }
 492
 493 static void grab_date(const char *buf, struct atom_value *v, const char *atomname)
 494 {
 495         const char *eoemail = strstr(buf, "> ");
 496         char *zone;
 497         unsigned long timestamp;
 498         long tz;
 499         struct date_mode date_mode = { DATE_NORMAL };
 500         const char *formatp;
 501
 502         /*
 503          * We got here because atomname ends in "date" or "date<something>";
 504          * it's not possible that <something> is not ":<format>" because
 505          * parse_ref_filter_atom() wouldn't have allowed it, so we can assume that no
 506          * ":" means no format is specified, and use the default.
 507          */
 508         formatp = strchr(atomname, ':');
 509         if (formatp != NULL) {
 510                 formatp++;
 511                 parse_date_format(formatp, &date_mode);
 512         }
 513
 514         if (!eoemail)
 515                 goto bad;
 516         timestamp = strtoul(eoemail + 2, &zone, 10);
 517         if (timestamp == ULONG_MAX)
 518                 goto bad;
 519         tz = strtol(zone, NULL, 10);
 520         if ((tz == LONG_MIN || tz == LONG_MAX) && errno == ERANGE)
 521                 goto bad;
 522         v->s = xstrdup(show_date(timestamp, tz, &date_mode));
 523         v->ul = timestamp;
 524         return;
 525  bad:
 526         v->s = "";
 527         v->ul = 0;
 528 }
 529
 530 /* See grab_values */
 531 static void grab_person(const char *who, struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 532 {
 533         int i;
 534         int wholen = strlen(who);
 535         const char *wholine = NULL;
 536
 537         for (i = 0; i < used_atom_cnt; i++) {
 538                 const char *name = used_atom[i];
 539                 struct atom_value *v = &val[i];
 540                 if (!!deref != (*name == '*'))
 541                         continue;
 542                 if (deref)
 543                         name++;
 544                 if (strncmp(who, name, wholen))
 545                         continue;
 546                 if (name[wholen] != 0 &&
 547                     strcmp(name + wholen, "name") &&
 548                     strcmp(name + wholen, "email") &&
 549                     !starts_with(name + wholen, "date"))
 550                         continue;
 551                 if (!wholine)
 552                         wholine = find_wholine(who, wholen, buf, sz);
 553                 if (!wholine)
 554                         return; /* no point looking for it */
 555                 if (name[wholen] == 0)
 556                         v->s = copy_line(wholine);
 557                 else if (!strcmp(name + wholen, "name"))
 558                         v->s = copy_name(wholine);
 559                 else if (!strcmp(name + wholen, "email"))
 560                         v->s = copy_email(wholine);
 561                 else if (starts_with(name + wholen, "date"))
 562                         grab_date(wholine, v, name);
 563         }
 564
 565         /*
 566          * For a tag or a commit object, if "creator" or "creatordate" is
 567          * requested, do something special.
 568          */
 569         if (strcmp(who, "tagger") && strcmp(who, "committer"))
 570                 return; /* "author" for commit object is not wanted */
 571         if (!wholine)
 572                 wholine = find_wholine(who, wholen, buf, sz);
 573         if (!wholine)
 574                 return;
 575         for (i = 0; i < used_atom_cnt; i++) {
 576                 const char *name = used_atom[i];
 577                 struct atom_value *v = &val[i];
 578                 if (!!deref != (*name == '*'))
 579                         continue;
 580                 if (deref)
 581                         name++;
 582
 583                 if (starts_with(name, "creatordate"))
 584                         grab_date(wholine, v, name);
 585                 else if (!strcmp(name, "creator"))
 586                         v->s = copy_line(wholine);
 587         }
 588 }
 589
 590 static void find_subpos(const char *buf, unsigned long sz,
 591                         const char **sub, unsigned long *sublen,
 592                         const char **body, unsigned long *bodylen,
 593                         unsigned long *nonsiglen,
 594                         const char **sig, unsigned long *siglen)
 595 {
 596         const char *eol;
 597         /* skip past header until we hit empty line */
 598         while (*buf && *buf != '\n') {
 599                 eol = strchrnul(buf, '\n');
 600                 if (*eol)
 601                         eol++;
 602                 buf = eol;
 603         }
 604         /* skip any empty lines */
 605         while (*buf == '\n')
 606                 buf++;
 607
 608         /* parse signature first; we might not even have a subject line */
 609         *sig = buf + parse_signature(buf, strlen(buf));
 610         *siglen = strlen(*sig);
 611
 612         /* subject is first non-empty line */
 613         *sub = buf;
 614         /* subject goes to first empty line */
 615         while (buf < *sig && *buf && *buf != '\n') {
 616                 eol = strchrnul(buf, '\n');
 617                 if (*eol)
 618                         eol++;
 619                 buf = eol;
 620         }
 621         *sublen = buf - *sub;
 622         /* drop trailing newline, if present */
 623         if (*sublen && (*sub)[*sublen - 1] == '\n')
 624                 *sublen -= 1;
 625
 626         /* skip any empty lines */
 627         while (*buf == '\n')
 628                 buf++;
 629         *body = buf;
 630         *bodylen = strlen(buf);
 631         *nonsiglen = *sig - buf;
 632 }
 633
 634 /*
 635  * If 'lines' is greater than 0, append that many lines from the given
 636  * 'buf' of length 'size' to the given strbuf.
 637  */
 638 static void append_lines(struct strbuf *out, const char *buf, unsigned long size, int lines)
 639 {
 640         int i;
 641         const char *sp, *eol;
 642         size_t len;
 643
 644         sp = buf;
 645
 646         for (i = 0; i < lines && sp < buf + size; i++) {
 647                 if (i)
 648                         strbuf_addstr(out, "\n    ");
 649                 eol = memchr(sp, '\n', size - (sp - buf));
 650                 len = eol ? eol - sp : size - (sp - buf);
 651                 strbuf_add(out, sp, len);
 652                 if (!eol)
 653                         break;
 654                 sp = eol + 1;
 655         }
 656 }
 657
 658 /* See grab_values */
 659 static void grab_sub_body_contents(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 660 {
 661         int i;
 662         const char *subpos = NULL, *bodypos = NULL, *sigpos = NULL;
 663         unsigned long sublen = 0, bodylen = 0, nonsiglen = 0, siglen = 0;
 664
 665         for (i = 0; i < used_atom_cnt; i++) {
 666                 const char *name = used_atom[i];
 667                 struct atom_value *v = &val[i];
 668                 const char *valp = NULL;
 669                 if (!!deref != (*name == '*'))
 670                         continue;
 671                 if (deref)
 672                         name++;
 673                 if (strcmp(name, "subject") &&
 674                     strcmp(name, "body") &&
 675                     strcmp(name, "contents") &&
 676                     strcmp(name, "contents:subject") &&
 677                     strcmp(name, "contents:body") &&
 678                     strcmp(name, "contents:signature") &&
 679                     !starts_with(name, "contents:lines="))
 680                         continue;
 681                 if (!subpos)
 682                         find_subpos(buf, sz,
 683                                     &subpos, &sublen,
 684                                     &bodypos, &bodylen, &nonsiglen,
 685                                     &sigpos, &siglen);
 686
 687                 if (!strcmp(name, "subject"))
 688                         v->s = copy_subject(subpos, sublen);
 689                 else if (!strcmp(name, "contents:subject"))
 690                         v->s = copy_subject(subpos, sublen);
 691                 else if (!strcmp(name, "body"))
 692                         v->s = xmemdupz(bodypos, bodylen);
 693                 else if (!strcmp(name, "contents:body"))
 694                         v->s = xmemdupz(bodypos, nonsiglen);
 695                 else if (!strcmp(name, "contents:signature"))
 696                         v->s = xmemdupz(sigpos, siglen);
 697                 else if (!strcmp(name, "contents"))
 698                         v->s = xstrdup(subpos);
 699                 else if (skip_prefix(name, "contents:lines=", &valp)) {
 700                         struct strbuf s = STRBUF_INIT;
 701                         const char *contents_end = bodylen + bodypos - siglen;
 702
 703                         if (strtoul_ui(valp, 10, &v->u.contents.lines))
 704                                 die(_("positive value expected contents:lines=%s"), valp);
 705                         /*  Size is the length of the message after removing the signature */
 706                         append_lines(&s, subpos, contents_end - subpos, v->u.contents.lines);
 707                         v->s = strbuf_detach(&s, NULL);
 708                 }
 709         }
 710 }
 711
 712 /*
 713  * We want to have empty print-string for field requests
 714  * that do not apply (e.g. "authordate" for a tag object)
 715  */
 716 static void fill_missing_values(struct atom_value *val)
 717 {
 718         int i;
 719         for (i = 0; i < used_atom_cnt; i++) {
 720                 struct atom_value *v = &val[i];
 721                 if (v->s == NULL)
 722                         v->s = "";
 723         }
 724 }
 725
 726 /*
 727  * val is a list of atom_value to hold returned values.  Extract
 728  * the values for atoms in used_atom array out of (obj, buf, sz).
 729  * when deref is false, (obj, buf, sz) is the object that is
 730  * pointed at by the ref itself; otherwise it is the object the
 731  * ref (which is a tag) refers to.
 732  */
 733 static void grab_values(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 734 {
 735         grab_common_values(val, deref, obj, buf, sz);
 736         switch (obj->type) {
 737         case OBJ_TAG:
 738                 grab_tag_values(val, deref, obj, buf, sz);
 739                 grab_sub_body_contents(val, deref, obj, buf, sz);
 740                 grab_person("tagger", val, deref, obj, buf, sz);
 741                 break;
 742         case OBJ_COMMIT:
 743                 grab_commit_values(val, deref, obj, buf, sz);
 744                 grab_sub_body_contents(val, deref, obj, buf, sz);
 745                 grab_person("author", val, deref, obj, buf, sz);
 746                 grab_person("committer", val, deref, obj, buf, sz);
 747                 break;
 748         case OBJ_TREE:
 749                 /* grab_tree_values(val, deref, obj, buf, sz); */
 750                 break;
 751         case OBJ_BLOB:
 752                 /* grab_blob_values(val, deref, obj, buf, sz); */
 753                 break;
 754         default:
 755                 die("Eh?  Object of type %d?", obj->type);
 756         }
 757 }
 758
 759 static inline char *copy_advance(char *dst, const char *src)
 760 {
 761         while (*src)
 762                 *dst++ = *src++;
 763         return dst;
 764 }
 765
 766 /*
 767  * Parse the object referred by ref, and grab needed value.
 768  */
 769 static void populate_value(struct ref_array_item *ref)
 770 {
 771         void *buf;
 772         struct object *obj;
 773         int eaten, i;
 774         unsigned long size;
 775         const unsigned char *tagged;
 776
 777         ref->value = xcalloc(used_atom_cnt, sizeof(struct atom_value));
 778
 779         if (need_symref && (ref->flag & REF_ISSYMREF) && !ref->symref) {
 780                 unsigned char unused1[20];
 781                 ref->symref = resolve_refdup(ref->refname, RESOLVE_REF_READING,
 782                                              unused1, NULL);
 783                 if (!ref->symref)
 784                         ref->symref = "";
 785         }
 786
 787         /* Fill in specials first */
 788         for (i = 0; i < used_atom_cnt; i++) {
 789                 const char *name = used_atom[i];
 790                 struct atom_value *v = &ref->value[i];
 791                 int deref = 0;
 792                 const char *refname;
 793                 const char *formatp;
 794                 const char *valp;
 795                 struct branch *branch = NULL;
 796
 797                 v->handler = append_atom;
 798
 799                 if (*name == '*') {
 800                         deref = 1;
 801                         name++;
 802                 }
 803
 804                 if (starts_with(name, "refname"))
 805                         refname = ref->refname;
 806                 else if (starts_with(name, "symref"))
 807                         refname = ref->symref ? ref->symref : "";
 808                 else if (starts_with(name, "upstream")) {
 809                         const char *branch_name;
 810                         /* only local branches may have an upstream */
 811                         if (!skip_prefix(ref->refname, "refs/heads/",
 812                                          &branch_name))
 813                                 continue;
 814                         branch = branch_get(branch_name);
 815
 816                         refname = branch_get_upstream(branch, NULL);
 817                         if (!refname)
 818                                 continue;
 819                 } else if (starts_with(name, "push")) {
 820                         const char *branch_name;
 821                         if (!skip_prefix(ref->refname, "refs/heads/",
 822                                          &branch_name))
 823                                 continue;
 824                         branch = branch_get(branch_name);
 825
 826                         refname = branch_get_push(branch, NULL);
 827                         if (!refname)
 828                                 continue;
 829                 } else if (match_atom_name(name, "color", &valp)) {
 830                         char color[COLOR_MAXLEN] = "";
 831
 832                         if (!valp)
 833                                 die(_("expected format: %%(color:<color>)"));
 834                         if (color_parse(valp, color) < 0)
 835                                 die(_("unable to parse format"));
 836                         v->s = xstrdup(color);
 837                         continue;
 838                 } else if (!strcmp(name, "flag")) {
 839                         char buf[256], *cp = buf;
 840                         if (ref->flag & REF_ISSYMREF)
 841                                 cp = copy_advance(cp, ",symref");
 842                         if (ref->flag & REF_ISPACKED)
 843                                 cp = copy_advance(cp, ",packed");
 844                         if (cp == buf)
 845                                 v->s = "";
 846                         else {
 847                                 *cp = '\0';
 848                                 v->s = xstrdup(buf + 1);
 849                         }
 850                         continue;
 851                 } else if (!deref && grab_objectname(name, ref->objectname, v)) {
 852                         continue;
 853                 } else if (!strcmp(name, "HEAD")) {
 854                         const char *head;
 855                         unsigned char sha1[20];
 856
 857                         head = resolve_ref_unsafe("HEAD", RESOLVE_REF_READING,
 858                                                   sha1, NULL);
 859                         if (!strcmp(ref->refname, head))
 860                                 v->s = "*";
 861                         else
 862                                 v->s = " ";
 863                         continue;
 864                 } else if (match_atom_name(name, "align", &valp)) {
 865                         struct align *align = &v->u.align;
 866                         struct strbuf **s, **to_free;
 867                         int width = -1;
 868
 869                         if (!valp)
 870                                 die(_("expected format: %%(align:<width>,<position>)"));
 871
 872                         /*
 873                          * TODO: Implement a function similar to strbuf_split_str()
 874                          * which would omit the separator from the end of each value.
 875                          */
 876                         s = to_free = strbuf_split_str(valp, ',', 0);
 877
 878                         align->position = ALIGN_LEFT;
 879
 880                         while (*s) {
 881                                 /*  Strip trailing comma */
 882                                 if (s[1])
 883                                         strbuf_setlen(s[0], s[0]->len - 1);
 884                                 if (!strtoul_ui(s[0]->buf, 10, (unsigned int *)&width))
 885                                         ;
 886                                 else if (!strcmp(s[0]->buf, "left"))
 887                                         align->position = ALIGN_LEFT;
 888                                 else if (!strcmp(s[0]->buf, "right"))
 889                                         align->position = ALIGN_RIGHT;
 890                                 else if (!strcmp(s[0]->buf, "middle"))
 891                                         align->position = ALIGN_MIDDLE;
 892                                 else
 893                                         die(_("improper format entered align:%s"), s[0]->buf);
 894                                 s++;
 895                         }
 896
 897                         if (width < 0)
 898                                 die(_("positive width expected with the %%(align) atom"));
 899                         align->width = width;
 900                         strbuf_list_free(to_free);
 901                         v->handler = align_atom_handler;
 902                         continue;
 903                 } else if (!strcmp(name, "end")) {
 904                         v->handler = end_atom_handler;
 905                         continue;
 906                 } else
 907                         continue;
 908
 909                 formatp = strchr(name, ':');
 910                 if (formatp) {
 911                         int num_ours, num_theirs;
 912
 913                         formatp++;
 914                         if (!strcmp(formatp, "short"))
 915                                 refname = shorten_unambiguous_ref(refname,
 916                                                       warn_ambiguous_refs);
 917                         else if (!strcmp(formatp, "track") &&
 918                                  (starts_with(name, "upstream") ||
 919                                   starts_with(name, "push"))) {
 920
 921                                 if (stat_tracking_info(branch, &num_ours,
 922                                                        &num_theirs, NULL))
 923                                         continue;
 924
 925                                 if (!num_ours && !num_theirs)
 926                                         v->s = "";
 927                                 else if (!num_ours)
 928                                         v->s = xstrfmt("[behind %d]", num_theirs);
 929                                 else if (!num_theirs)
 930                                         v->s = xstrfmt("[ahead %d]", num_ours);
 931                                 else
 932                                         v->s = xstrfmt("[ahead %d, behind %d]",
 933                                                        num_ours, num_theirs);
 934                                 continue;
 935                         } else if (!strcmp(formatp, "trackshort") &&
 936                                    (starts_with(name, "upstream") ||
 937                                     starts_with(name, "push"))) {
 938                                 assert(branch);
 939
 940                                 if (stat_tracking_info(branch, &num_ours,
 941                                                         &num_theirs, NULL))
 942                                         continue;
 943
 944                                 if (!num_ours && !num_theirs)
 945                                         v->s = "=";
 946                                 else if (!num_ours)
 947                                         v->s = "<";
 948                                 else if (!num_theirs)
 949                                         v->s = ">";
 950                                 else
 951                                         v->s = "<>";
 952                                 continue;
 953                         } else
 954                                 die("unknown %.*s format %s",
 955                                     (int)(formatp - name), name, formatp);
 956                 }
 957
 958                 if (!deref)
 959                         v->s = refname;
 960                 else
 961                         v->s = xstrfmt("%s^{}", refname);
 962         }
 963
 964         for (i = 0; i < used_atom_cnt; i++) {
 965                 struct atom_value *v = &ref->value[i];
 966                 if (v->s == NULL)
 967                         goto need_obj;
 968         }
 969         return;
 970
 971  need_obj:
 972         buf = get_obj(ref->objectname, &obj, &size, &eaten);
 973         if (!buf)
 974                 die("missing object %s for %s",
 975                     sha1_to_hex(ref->objectname), ref->refname);
 976         if (!obj)
 977                 die("parse_object_buffer failed on %s for %s",
 978                     sha1_to_hex(ref->objectname), ref->refname);
 979
 980         grab_values(ref->value, 0, obj, buf, size);
 981         if (!eaten)
 982                 free(buf);
 983
 984         /*
 985          * If there is no atom that wants to know about tagged
 986          * object, we are done.
 987          */
 988         if (!need_tagged || (obj->type != OBJ_TAG))
 989                 return;
 990
 991         /*
 992          * If it is a tag object, see if we use a value that derefs
 993          * the object, and if we do grab the object it refers to.
 994          */
 995         tagged = ((struct tag *)obj)->tagged->oid.hash;
 996
 997         /*
 998          * NEEDSWORK: This derefs tag only once, which
 999          * is good to deal with chains of trust, but
1000          * is not consistent with what deref_tag() does
1001          * which peels the onion to the core.
1002          */
1003         buf = get_obj(tagged, &obj, &size, &eaten);
1004         if (!buf)
1005                 die("missing object %s for %s",
1006                     sha1_to_hex(tagged), ref->refname);
1007         if (!obj)
1008                 die("parse_object_buffer failed on %s for %s",
1009                     sha1_to_hex(tagged), ref->refname);
1010         grab_values(ref->value, 1, obj, buf, size);
1011         if (!eaten)
1012                 free(buf);
1013 }
1014
1015 /*
1016  * Given a ref, return the value for the atom.  This lazily gets value
1017  * out of the object by calling populate value.
1018  */
1019 static void get_ref_atom_value(struct ref_array_item *ref, int atom, struct atom_value **v)
1020 {
1021         if (!ref->value) {
1022                 populate_value(ref);
1023                 fill_missing_values(ref->value);
1024         }
1025         *v = &ref->value[atom];
1026 }
1027
1028 enum contains_result {
1029         CONTAINS_UNKNOWN = -1,
1030         CONTAINS_NO = 0,
1031         CONTAINS_YES = 1
1032 };
1033
1034 /*
1035  * Mimicking the real stack, this stack lives on the heap, avoiding stack
1036  * overflows.
1037  *
1038  * At each recursion step, the stack items points to the commits whose
1039  * ancestors are to be inspected.
1040  */
1041 struct contains_stack {
1042         int nr, alloc;
1043         struct contains_stack_entry {
1044                 struct commit *commit;
1045                 struct commit_list *parents;
1046         } *contains_stack;
1047 };
1048
1049 static int in_commit_list(const struct commit_list *want, struct commit *c)
1050 {
1051         for (; want; want = want->next)
1052                 if (!oidcmp(&want->item->object.oid, &c->object.oid))
1053                         return 1;
1054         return 0;
1055 }
1056
1057 /*
1058  * Test whether the candidate or one of its parents is contained in the list.
1059  * Do not recurse to find out, though, but return -1 if inconclusive.
1060  */
1061 static enum contains_result contains_test(struct commit *candidate,
1062                             const struct commit_list *want)
1063 {
1064         /* was it previously marked as containing a want commit? */
1065         if (candidate->object.flags & TMP_MARK)
1066                 return 1;
1067         /* or marked as not possibly containing a want commit? */
1068         if (candidate->object.flags & UNINTERESTING)
1069                 return 0;
1070         /* or are we it? */
1071         if (in_commit_list(want, candidate)) {
1072                 candidate->object.flags |= TMP_MARK;
1073                 return 1;
1074         }
1075
1076         if (parse_commit(candidate) < 0)
1077                 return 0;
1078
1079         return -1;
1080 }
1081
1082 static void push_to_contains_stack(struct commit *candidate, struct contains_stack *contains_stack)
1083 {
1084         ALLOC_GROW(contains_stack->contains_stack, contains_stack->nr + 1, contains_stack->alloc);
1085         contains_stack->contains_stack[contains_stack->nr].commit = candidate;
1086         contains_stack->contains_stack[contains_stack->nr++].parents = candidate->parents;
1087 }
1088
1089 static enum contains_result contains_tag_algo(struct commit *candidate,
1090                 const struct commit_list *want)
1091 {
1092         struct contains_stack contains_stack = { 0, 0, NULL };
1093         int result = contains_test(candidate, want);
1094
1095         if (result != CONTAINS_UNKNOWN)
1096                 return result;
1097
1098         push_to_contains_stack(candidate, &contains_stack);
1099         while (contains_stack.nr) {
1100                 struct contains_stack_entry *entry = &contains_stack.contains_stack[contains_stack.nr - 1];
1101                 struct commit *commit = entry->commit;
1102                 struct commit_list *parents = entry->parents;
1103
1104                 if (!parents) {
1105                         commit->object.flags |= UNINTERESTING;
1106                         contains_stack.nr--;
1107                 }
1108                 /*
1109                  * If we just popped the stack, parents->item has been marked,
1110                  * therefore contains_test will return a meaningful 0 or 1.
1111                  */
1112                 else switch (contains_test(parents->item, want)) {
1113                 case CONTAINS_YES:
1114                         commit->object.flags |= TMP_MARK;
1115                         contains_stack.nr--;
1116                         break;
1117                 case CONTAINS_NO:
1118                         entry->parents = parents->next;
1119                         break;
1120                 case CONTAINS_UNKNOWN:
1121                         push_to_contains_stack(parents->item, &contains_stack);
1122                         break;
1123                 }
1124         }
1125         free(contains_stack.contains_stack);
1126         return contains_test(candidate, want);
1127 }
1128
1129 static int commit_contains(struct ref_filter *filter, struct commit *commit)
1130 {
1131         if (filter->with_commit_tag_algo)
1132                 return contains_tag_algo(commit, filter->with_commit);
1133         return is_descendant_of(commit, filter->with_commit);
1134 }
1135
1136 /*
1137  * Return 1 if the refname matches one of the patterns, otherwise 0.
1138  * A pattern can be a literal prefix (e.g. a refname "refs/heads/master"
1139  * matches a pattern "refs/heads/mas") or a wildcard (e.g. the same ref
1140  * matches "refs/heads/mas*", too).
1141  */
1142 static int match_pattern(const char **patterns, const char *refname)
1143 {
1144         /*
1145          * When no '--format' option is given we need to skip the prefix
1146          * for matching refs of tags and branches.
1147          */
1148         (void)(skip_prefix(refname, "refs/tags/", &refname) ||
1149                skip_prefix(refname, "refs/heads/", &refname) ||
1150                skip_prefix(refname, "refs/remotes/", &refname) ||
1151                skip_prefix(refname, "refs/", &refname));
1152
1153         for (; *patterns; patterns++) {
1154                 if (!wildmatch(*patterns, refname, 0, NULL))
1155                         return 1;
1156         }
1157         return 0;
1158 }
1159
1160 /*
1161  * Return 1 if the refname matches one of the patterns, otherwise 0.
1162  * A pattern can be path prefix (e.g. a refname "refs/heads/master"
1163  * matches a pattern "refs/heads/" but not "refs/heads/m") or a
1164  * wildcard (e.g. the same ref matches "refs/heads/m*", too).
1165  */
1166 static int match_name_as_path(const char **pattern, const char *refname)
1167 {
1168         int namelen = strlen(refname);
1169         for (; *pattern; pattern++) {
1170                 const char *p = *pattern;
1171                 int plen = strlen(p);
1172
1173                 if ((plen <= namelen) &&
1174                     !strncmp(refname, p, plen) &&
1175                     (refname[plen] == '\0' ||
1176                      refname[plen] == '/' ||
1177                      p[plen-1] == '/'))
1178                         return 1;
1179                 if (!wildmatch(p, refname, WM_PATHNAME, NULL))
1180                         return 1;
1181         }
1182         return 0;
1183 }
1184
1185 /* Return 1 if the refname matches one of the patterns, otherwise 0. */
1186 static int filter_pattern_match(struct ref_filter *filter, const char *refname)
1187 {
1188         if (!*filter->name_patterns)
1189                 return 1; /* No pattern always matches */
1190         if (filter->match_as_path)
1191                 return match_name_as_path(filter->name_patterns, refname);
1192         return match_pattern(filter->name_patterns, refname);
1193 }
1194
1195 /*
1196  * Given a ref (sha1, refname), check if the ref belongs to the array
1197  * of sha1s. If the given ref is a tag, check if the given tag points
1198  * at one of the sha1s in the given sha1 array.
1199  * the given sha1_array.
1200  * NEEDSWORK:
1201  * 1. Only a single level of inderection is obtained, we might want to
1202  * change this to account for multiple levels (e.g. annotated tags
1203  * pointing to annotated tags pointing to a commit.)
1204  * 2. As the refs are cached we might know what refname peels to without
1205  * the need to parse the object via parse_object(). peel_ref() might be a
1206  * more efficient alternative to obtain the pointee.
1207  */
1208 static const unsigned char *match_points_at(struct sha1_array *points_at,
1209                                             const unsigned char *sha1,
1210                                             const char *refname)
1211 {
1212         const unsigned char *tagged_sha1 = NULL;
1213         struct object *obj;
1214
1215         if (sha1_array_lookup(points_at, sha1) >= 0)
1216                 return sha1;
1217         obj = parse_object(sha1);
1218         if (!obj)
1219                 die(_("malformed object at '%s'"), refname);
1220         if (obj->type == OBJ_TAG)
1221                 tagged_sha1 = ((struct tag *)obj)->tagged->oid.hash;
1222         if (tagged_sha1 && sha1_array_lookup(points_at, tagged_sha1) >= 0)
1223                 return tagged_sha1;
1224         return NULL;
1225 }
1226
1227 /* Allocate space for a new ref_array_item and copy the objectname and flag to it */
1228 static struct ref_array_item *new_ref_array_item(const char *refname,
1229                                                  const unsigned char *objectname,
1230                                                  int flag)
1231 {
1232         size_t len = strlen(refname);
1233         struct ref_array_item *ref = xcalloc(1, sizeof(struct ref_array_item) + len + 1);
1234         memcpy(ref->refname, refname, len);
1235         ref->refname[len] = '\0';
1236         hashcpy(ref->objectname, objectname);
1237         ref->flag = flag;
1238
1239         return ref;
1240 }
1241
1242 static int filter_ref_kind(struct ref_filter *filter, const char *refname)
1243 {
1244         unsigned int i;
1245
1246         static struct {
1247                 const char *prefix;
1248                 unsigned int kind;
1249         } ref_kind[] = {
1250                 { "refs/heads/" , FILTER_REFS_BRANCHES },
1251                 { "refs/remotes/" , FILTER_REFS_REMOTES },
1252                 { "refs/tags/", FILTER_REFS_TAGS}
1253         };
1254
1255         if (filter->kind == FILTER_REFS_BRANCHES ||
1256             filter->kind == FILTER_REFS_REMOTES ||
1257             filter->kind == FILTER_REFS_TAGS)
1258                 return filter->kind;
1259         else if (!strcmp(refname, "HEAD"))
1260                 return FILTER_REFS_DETACHED_HEAD;
1261
1262         for (i = 0; i < ARRAY_SIZE(ref_kind); i++) {
1263                 if (starts_with(refname, ref_kind[i].prefix))
1264                         return ref_kind[i].kind;
1265         }
1266
1267         return FILTER_REFS_OTHERS;
1268 }
1269
1270 /*
1271  * A call-back given to for_each_ref().  Filter refs and keep them for
1272  * later object processing.
1273  */
1274 static int ref_filter_handler(const char *refname, const struct object_id *oid, int flag, void *cb_data)
1275 {
1276         struct ref_filter_cbdata *ref_cbdata = cb_data;
1277         struct ref_filter *filter = ref_cbdata->filter;
1278         struct ref_array_item *ref;
1279         struct commit *commit = NULL;
1280         unsigned int kind;
1281
1282         if (flag & REF_BAD_NAME) {
1283                 warning("ignoring ref with broken name %s", refname);
1284                 return 0;
1285         }
1286
1287         if (flag & REF_ISBROKEN) {
1288                 warning("ignoring broken ref %s", refname);
1289                 return 0;
1290         }
1291
1292         /* Obtain the current ref kind from filter_ref_kind() and ignore unwanted refs. */
1293         kind = filter_ref_kind(filter, refname);
1294         if (!(kind & filter->kind))
1295                 return 0;
1296
1297         if (!filter_pattern_match(filter, refname))
1298                 return 0;
1299
1300         if (filter->points_at.nr && !match_points_at(&filter->points_at, oid->hash, refname))
1301                 return 0;
1302
1303         /*
1304          * A merge filter is applied on refs pointing to commits. Hence
1305          * obtain the commit using the 'oid' available and discard all
1306          * non-commits early. The actual filtering is done later.
1307          */
1308         if (filter->merge_commit || filter->with_commit || filter->verbose) {
1309                 commit = lookup_commit_reference_gently(oid->hash, 1);
1310                 if (!commit)
1311                         return 0;
1312                 /* We perform the filtering for the '--contains' option */
1313                 if (filter->with_commit &&
1314                     !commit_contains(filter, commit))
1315                         return 0;
1316         }
1317
1318         /*
1319          * We do not open the object yet; sort may only need refname
1320          * to do its job and the resulting list may yet to be pruned
1321          * by maxcount logic.
1322          */
1323         ref = new_ref_array_item(refname, oid->hash, flag);
1324         ref->commit = commit;
1325
1326         REALLOC_ARRAY(ref_cbdata->array->items, ref_cbdata->array->nr + 1);
1327         ref_cbdata->array->items[ref_cbdata->array->nr++] = ref;
1328         ref->kind = kind;
1329         return 0;
1330 }
1331
1332 /*  Free memory allocated for a ref_array_item */
1333 static void free_array_item(struct ref_array_item *item)
1334 {
1335         free((char *)item->symref);
1336         free(item);
1337 }
1338
1339 /* Free all memory allocated for ref_array */
1340 void ref_array_clear(struct ref_array *array)
1341 {
1342         int i;
1343
1344         for (i = 0; i < array->nr; i++)
1345                 free_array_item(array->items[i]);
1346         free(array->items);
1347         array->items = NULL;
1348         array->nr = array->alloc = 0;
1349 }
1350
1351 static void do_merge_filter(struct ref_filter_cbdata *ref_cbdata)
1352 {
1353         struct rev_info revs;
1354         int i, old_nr;
1355         struct ref_filter *filter = ref_cbdata->filter;
1356         struct ref_array *array = ref_cbdata->array;
1357         struct commit **to_clear = xcalloc(sizeof(struct commit *), array->nr);
1358
1359         init_revisions(&revs, NULL);
1360
1361         for (i = 0; i < array->nr; i++) {
1362                 struct ref_array_item *item = array->items[i];
1363                 add_pending_object(&revs, &item->commit->object, item->refname);
1364                 to_clear[i] = item->commit;
1365         }
1366
1367         filter->merge_commit->object.flags |= UNINTERESTING;
1368         add_pending_object(&revs, &filter->merge_commit->object, "");
1369
1370         revs.limited = 1;
1371         if (prepare_revision_walk(&revs))
1372                 die(_("revision walk setup failed"));
1373
1374         old_nr = array->nr;
1375         array->nr = 0;
1376
1377         for (i = 0; i < old_nr; i++) {
1378                 struct ref_array_item *item = array->items[i];
1379                 struct commit *commit = item->commit;
1380
1381                 int is_merged = !!(commit->object.flags & UNINTERESTING);
1382
1383                 if (is_merged == (filter->merge == REF_FILTER_MERGED_INCLUDE))
1384                         array->items[array->nr++] = array->items[i];
1385                 else
1386                         free_array_item(item);
1387         }
1388
1389         for (i = 0; i < old_nr; i++)
1390                 clear_commit_marks(to_clear[i], ALL_REV_FLAGS);
1391         clear_commit_marks(filter->merge_commit, ALL_REV_FLAGS);
1392         free(to_clear);
1393 }
1394
1395 /*
1396  * API for filtering a set of refs. Based on the type of refs the user
1397  * has requested, we iterate through those refs and apply filters
1398  * as per the given ref_filter structure and finally store the
1399  * filtered refs in the ref_array structure.
1400  */
1401 int filter_refs(struct ref_array *array, struct ref_filter *filter, unsigned int type)
1402 {
1403         struct ref_filter_cbdata ref_cbdata;
1404         int ret = 0;
1405         unsigned int broken = 0;
1406
1407         ref_cbdata.array = array;
1408         ref_cbdata.filter = filter;
1409
1410         if (type & FILTER_REFS_INCLUDE_BROKEN)
1411                 broken = 1;
1412         filter->kind = type & FILTER_REFS_KIND_MASK;
1413
1414         /*  Simple per-ref filtering */
1415         if (!filter->kind)
1416                 die("filter_refs: invalid type");
1417         else {
1418                 /*
1419                  * For common cases where we need only branches or remotes or tags,
1420                  * we only iterate through those refs. If a mix of refs is needed,
1421                  * we iterate over all refs and filter out required refs with the help
1422                  * of filter_ref_kind().
1423                  */
1424                 if (filter->kind == FILTER_REFS_BRANCHES)
1425                         ret = for_each_fullref_in("refs/heads/", ref_filter_handler, &ref_cbdata, broken);
1426                 else if (filter->kind == FILTER_REFS_REMOTES)
1427                         ret = for_each_fullref_in("refs/remotes/", ref_filter_handler, &ref_cbdata, broken);
1428                 else if (filter->kind == FILTER_REFS_TAGS)
1429                         ret = for_each_fullref_in("refs/tags/", ref_filter_handler, &ref_cbdata, broken);
1430                 else if (filter->kind & FILTER_REFS_ALL)
1431                         ret = for_each_fullref_in("", ref_filter_handler, &ref_cbdata, broken);
1432                 if (!ret && (filter->kind & FILTER_REFS_DETACHED_HEAD))
1433                         head_ref(ref_filter_handler, &ref_cbdata);
1434         }
1435
1436
1437         /*  Filters that need revision walking */
1438         if (filter->merge_commit)
1439                 do_merge_filter(&ref_cbdata);
1440
1441         return ret;
1442 }
1443
1444 static int cmp_ref_sorting(struct ref_sorting *s, struct ref_array_item *a, struct ref_array_item *b)
1445 {
1446         struct atom_value *va, *vb;
1447         int cmp;
1448         cmp_type cmp_type = used_atom_type[s->atom];
1449
1450         get_ref_atom_value(a, s->atom, &va);
1451         get_ref_atom_value(b, s->atom, &vb);
1452         if (s->version)
1453                 cmp = versioncmp(va->s, vb->s);
1454         else if (cmp_type == FIELD_STR)
1455                 cmp = strcmp(va->s, vb->s);
1456         else {
1457                 if (va->ul < vb->ul)
1458                         cmp = -1;
1459                 else if (va->ul == vb->ul)
1460                         cmp = strcmp(a->refname, b->refname);
1461                 else
1462                         cmp = 1;
1463         }
1464
1465         return (s->reverse) ? -cmp : cmp;
1466 }
1467
1468 static struct ref_sorting *ref_sorting;
1469 static int compare_refs(const void *a_, const void *b_)
1470 {
1471         struct ref_array_item *a = *((struct ref_array_item **)a_);
1472         struct ref_array_item *b = *((struct ref_array_item **)b_);
1473         struct ref_sorting *s;
1474
1475         for (s = ref_sorting; s; s = s->next) {
1476                 int cmp = cmp_ref_sorting(s, a, b);
1477                 if (cmp)
1478                         return cmp;
1479         }
1480         return 0;
1481 }
1482
1483 void ref_array_sort(struct ref_sorting *sorting, struct ref_array *array)
1484 {
1485         ref_sorting = sorting;
1486         qsort(array->items, array->nr, sizeof(struct ref_array_item *), compare_refs);
1487 }
1488
1489 static int hex1(char ch)
1490 {
1491         if ('0' <= ch && ch <= '9')
1492                 return ch - '0';
1493         else if ('a' <= ch && ch <= 'f')
1494                 return ch - 'a' + 10;
1495         else if ('A' <= ch && ch <= 'F')
1496                 return ch - 'A' + 10;
1497         return -1;
1498 }
1499 static int hex2(const char *cp)
1500 {
1501         if (cp[0] && cp[1])
1502                 return (hex1(cp[0]) << 4) | hex1(cp[1]);
1503         else
1504                 return -1;
1505 }
1506
1507 static void append_literal(const char *cp, const char *ep, struct ref_formatting_state *state)
1508 {
1509         struct strbuf *s = &state->stack->output;
1510
1511         while (*cp && (!ep || cp < ep)) {
1512                 if (*cp == '%') {
1513                         if (cp[1] == '%')
1514                                 cp++;
1515                         else {
1516                                 int ch = hex2(cp + 1);
1517                                 if (0 <= ch) {
1518                                         strbuf_addch(s, ch);
1519                                         cp += 3;
1520                                         continue;
1521                                 }
1522                         }
1523                 }
1524                 strbuf_addch(s, *cp);
1525                 cp++;
1526         }
1527 }
1528
1529 void show_ref_array_item(struct ref_array_item *info, const char *format, int quote_style)
1530 {
1531         const char *cp, *sp, *ep;
1532         struct strbuf *final_buf;
1533         struct ref_formatting_state state = REF_FORMATTING_STATE_INIT;
1534
1535         state.quote_style = quote_style;
1536         push_stack_element(&state.stack);
1537
1538         for (cp = format; *cp && (sp = find_next(cp)); cp = ep + 1) {
1539                 struct atom_value *atomv;
1540
1541                 ep = strchr(sp, ')');
1542                 if (cp < sp)
1543                         append_literal(cp, sp, &state);
1544                 get_ref_atom_value(info, parse_ref_filter_atom(sp + 2, ep), &atomv);
1545                 atomv->handler(atomv, &state);
1546         }
1547         if (*cp) {
1548                 sp = cp + strlen(cp);
1549                 append_literal(cp, sp, &state);
1550         }
1551         if (need_color_reset_at_eol) {
1552                 struct atom_value resetv;
1553                 char color[COLOR_MAXLEN] = "";
1554
1555                 if (color_parse("reset", color) < 0)
1556                         die("BUG: couldn't parse 'reset' as a color");
1557                 resetv.s = color;
1558                 append_atom(&resetv, &state);
1559         }
1560         if (state.stack->prev)
1561                 die(_("format: %%(end) atom missing"));
1562         final_buf = &state.stack->output;
1563         fwrite(final_buf->buf, 1, final_buf->len, stdout);
1564         pop_stack_element(&state.stack);
1565         putchar('\n');
1566 }
1567
1568 /*  If no sorting option is given, use refname to sort as default */
1569 struct ref_sorting *ref_default_sorting(void)
1570 {
1571         static const char cstr_name[] = "refname";
1572
1573         struct ref_sorting *sorting = xcalloc(1, sizeof(*sorting));
1574
1575         sorting->next = NULL;
1576         sorting->atom = parse_ref_filter_atom(cstr_name, cstr_name + strlen(cstr_name));
1577         return sorting;
1578 }
1579
1580 int parse_opt_ref_sorting(const struct option *opt, const char *arg, int unset)
1581 {
1582         struct ref_sorting **sorting_tail = opt->value;
1583         struct ref_sorting *s;
1584         int len;
1585
1586         if (!arg) /* should --no-sort void the list ? */
1587                 return -1;
1588
1589         s = xcalloc(1, sizeof(*s));
1590         s->next = *sorting_tail;
1591         *sorting_tail = s;
1592
1593         if (*arg == '-') {
1594                 s->reverse = 1;
1595                 arg++;
1596         }
1597         if (skip_prefix(arg, "version:", &arg) ||
1598             skip_prefix(arg, "v:", &arg))
1599                 s->version = 1;
1600         len = strlen(arg);
1601         s->atom = parse_ref_filter_atom(arg, arg+len);
1602         return 0;
1603 }
1604
1605 int parse_opt_merge_filter(const struct option *opt, const char *arg, int unset)
1606 {
1607         struct ref_filter *rf = opt->value;
1608         unsigned char sha1[20];
1609
1610         rf->merge = starts_with(opt->long_name, "no")
1611                 ? REF_FILTER_MERGED_OMIT
1612                 : REF_FILTER_MERGED_INCLUDE;
1613
1614         if (get_sha1(arg, sha1))
1615                 die(_("malformed object name %s"), arg);
1616
1617         rf->merge_commit = lookup_commit_reference_gently(sha1, 0);
1618         if (!rf->merge_commit)
1619                 return opterror(opt, "must point to a commit", 0);
1620
1621         return 0;
1622 }