Andrew's git / gitweb.git / builtin/for-each-ref.c
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builtin / for-each-ref.con commit Merge branch 'nd/index-pack-one-fd-per-thread' into maint (a9041df)
   1#include "builtin.h"
   2#include "cache.h"
   3#include "refs.h"
   4#include "object.h"
   5#include "tag.h"
   6#include "commit.h"
   7#include "tree.h"
   8#include "blob.h"
   9#include "quote.h"
  10#include "parse-options.h"
  11#include "remote.h"
  12#include "color.h"
  13
  14/* Quoting styles */
  15#define QUOTE_NONE 0
  16#define QUOTE_SHELL 1
  17#define QUOTE_PERL 2
  18#define QUOTE_PYTHON 4
  19#define QUOTE_TCL 8
  20
  21typedef enum { FIELD_STR, FIELD_ULONG, FIELD_TIME } cmp_type;
  22
  23struct atom_value {
  24        const char *s;
  25        unsigned long ul; /* used for sorting when not FIELD_STR */
  26};
  27
  28struct ref_sort {
  29        struct ref_sort *next;
  30        int atom; /* index into used_atom array */
  31        unsigned reverse : 1;
  32};
  33
  34struct refinfo {
  35        char *refname;
  36        unsigned char objectname[20];
  37        int flag;
  38        const char *symref;
  39        struct atom_value *value;
  40};
  41
  42static struct {
  43        const char *name;
  44        cmp_type cmp_type;
  45} valid_atom[] = {
  46        { "refname" },
  47        { "objecttype" },
  48        { "objectsize", FIELD_ULONG },
  49        { "objectname" },
  50        { "tree" },
  51        { "parent" },
  52        { "numparent", FIELD_ULONG },
  53        { "object" },
  54        { "type" },
  55        { "tag" },
  56        { "author" },
  57        { "authorname" },
  58        { "authoremail" },
  59        { "authordate", FIELD_TIME },
  60        { "committer" },
  61        { "committername" },
  62        { "committeremail" },
  63        { "committerdate", FIELD_TIME },
  64        { "tagger" },
  65        { "taggername" },
  66        { "taggeremail" },
  67        { "taggerdate", FIELD_TIME },
  68        { "creator" },
  69        { "creatordate", FIELD_TIME },
  70        { "subject" },
  71        { "body" },
  72        { "contents" },
  73        { "contents:subject" },
  74        { "contents:body" },
  75        { "contents:signature" },
  76        { "upstream" },
  77        { "symref" },
  78        { "flag" },
  79        { "HEAD" },
  80        { "color" },
  81};
  82
  83/*
  84 * An atom is a valid field atom listed above, possibly prefixed with
  85 * a "*" to denote deref_tag().
  86 *
  87 * We parse given format string and sort specifiers, and make a list
  88 * of properties that we need to extract out of objects.  refinfo
  89 * structure will hold an array of values extracted that can be
  90 * indexed with the "atom number", which is an index into this
  91 * array.
  92 */
  93static const char **used_atom;
  94static cmp_type *used_atom_type;
  95static int used_atom_cnt, need_tagged, need_symref;
  96static int need_color_reset_at_eol;
  97
  98/*
  99 * Used to parse format string and sort specifiers
 100 */
 101static int parse_atom(const char *atom, const char *ep)
 102{
 103        const char *sp;
 104        int i, at;
 105
 106        sp = atom;
 107        if (*sp == '*' && sp < ep)
 108                sp++; /* deref */
 109        if (ep <= sp)
 110                die("malformed field name: %.*s", (int)(ep-atom), atom);
 111
 112        /* Do we have the atom already used elsewhere? */
 113        for (i = 0; i < used_atom_cnt; i++) {
 114                int len = strlen(used_atom[i]);
 115                if (len == ep - atom && !memcmp(used_atom[i], atom, len))
 116                        return i;
 117        }
 118
 119        /* Is the atom a valid one? */
 120        for (i = 0; i < ARRAY_SIZE(valid_atom); i++) {
 121                int len = strlen(valid_atom[i].name);
 122                /*
 123                 * If the atom name has a colon, strip it and everything after
 124                 * it off - it specifies the format for this entry, and
 125                 * shouldn't be used for checking against the valid_atom
 126                 * table.
 127                 */
 128                const char *formatp = strchr(sp, ':');
 129                if (!formatp || ep < formatp)
 130                        formatp = ep;
 131                if (len == formatp - sp && !memcmp(valid_atom[i].name, sp, len))
 132                        break;
 133        }
 134
 135        if (ARRAY_SIZE(valid_atom) <= i)
 136                die("unknown field name: %.*s", (int)(ep-atom), atom);
 137
 138        /* Add it in, including the deref prefix */
 139        at = used_atom_cnt;
 140        used_atom_cnt++;
 141        used_atom = xrealloc(used_atom,
 142                             (sizeof *used_atom) * used_atom_cnt);
 143        used_atom_type = xrealloc(used_atom_type,
 144                                  (sizeof(*used_atom_type) * used_atom_cnt));
 145        used_atom[at] = xmemdupz(atom, ep - atom);
 146        used_atom_type[at] = valid_atom[i].cmp_type;
 147        if (*atom == '*')
 148                need_tagged = 1;
 149        if (!strcmp(used_atom[at], "symref"))
 150                need_symref = 1;
 151        return at;
 152}
 153
 154/*
 155 * In a format string, find the next occurrence of %(atom).
 156 */
 157static const char *find_next(const char *cp)
 158{
 159        while (*cp) {
 160                if (*cp == '%') {
 161                        /*
 162                         * %( is the start of an atom;
 163                         * %% is a quoted per-cent.
 164                         */
 165                        if (cp[1] == '(')
 166                                return cp;
 167                        else if (cp[1] == '%')
 168                                cp++; /* skip over two % */
 169                        /* otherwise this is a singleton, literal % */
 170                }
 171                cp++;
 172        }
 173        return NULL;
 174}
 175
 176/*
 177 * Make sure the format string is well formed, and parse out
 178 * the used atoms.
 179 */
 180static int verify_format(const char *format)
 181{
 182        const char *cp, *sp;
 183        static const char color_reset[] = "color:reset";
 184
 185        need_color_reset_at_eol = 0;
 186        for (cp = format; *cp && (sp = find_next(cp)); ) {
 187                const char *ep = strchr(sp, ')');
 188                int at;
 189
 190                if (!ep)
 191                        return error("malformed format string %s", sp);
 192                /* sp points at "%(" and ep points at the closing ")" */
 193                at = parse_atom(sp + 2, ep);
 194                cp = ep + 1;
 195
 196                if (!memcmp(used_atom[at], "color:", 6))
 197                        need_color_reset_at_eol = !!strcmp(used_atom[at], color_reset);
 198        }
 199        return 0;
 200}
 201
 202/*
 203 * Given an object name, read the object data and size, and return a
 204 * "struct object".  If the object data we are returning is also borrowed
 205 * by the "struct object" representation, set *eaten as well---it is a
 206 * signal from parse_object_buffer to us not to free the buffer.
 207 */
 208static void *get_obj(const unsigned char *sha1, struct object **obj, unsigned long *sz, int *eaten)
 209{
 210        enum object_type type;
 211        void *buf = read_sha1_file(sha1, &type, sz);
 212
 213        if (buf)
 214                *obj = parse_object_buffer(sha1, type, *sz, buf, eaten);
 215        else
 216                *obj = NULL;
 217        return buf;
 218}
 219
 220static int grab_objectname(const char *name, const unsigned char *sha1,
 221                            struct atom_value *v)
 222{
 223        if (!strcmp(name, "objectname")) {
 224                char *s = xmalloc(41);
 225                strcpy(s, sha1_to_hex(sha1));
 226                v->s = s;
 227                return 1;
 228        }
 229        if (!strcmp(name, "objectname:short")) {
 230                v->s = xstrdup(find_unique_abbrev(sha1, DEFAULT_ABBREV));
 231                return 1;
 232        }
 233        return 0;
 234}
 235
 236/* See grab_values */
 237static void grab_common_values(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 238{
 239        int i;
 240
 241        for (i = 0; i < used_atom_cnt; i++) {
 242                const char *name = used_atom[i];
 243                struct atom_value *v = &val[i];
 244                if (!!deref != (*name == '*'))
 245                        continue;
 246                if (deref)
 247                        name++;
 248                if (!strcmp(name, "objecttype"))
 249                        v->s = typename(obj->type);
 250                else if (!strcmp(name, "objectsize")) {
 251                        char *s = xmalloc(40);
 252                        sprintf(s, "%lu", sz);
 253                        v->ul = sz;
 254                        v->s = s;
 255                }
 256                else if (deref)
 257                        grab_objectname(name, obj->sha1, v);
 258        }
 259}
 260
 261/* See grab_values */
 262static void grab_tag_values(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 263{
 264        int i;
 265        struct tag *tag = (struct tag *) obj;
 266
 267        for (i = 0; i < used_atom_cnt; i++) {
 268                const char *name = used_atom[i];
 269                struct atom_value *v = &val[i];
 270                if (!!deref != (*name == '*'))
 271                        continue;
 272                if (deref)
 273                        name++;
 274                if (!strcmp(name, "tag"))
 275                        v->s = tag->tag;
 276                else if (!strcmp(name, "type") && tag->tagged)
 277                        v->s = typename(tag->tagged->type);
 278                else if (!strcmp(name, "object") && tag->tagged) {
 279                        char *s = xmalloc(41);
 280                        strcpy(s, sha1_to_hex(tag->tagged->sha1));
 281                        v->s = s;
 282                }
 283        }
 284}
 285
 286static int num_parents(struct commit *commit)
 287{
 288        struct commit_list *parents;
 289        int i;
 290
 291        for (i = 0, parents = commit->parents;
 292             parents;
 293             parents = parents->next)
 294                i++;
 295        return i;
 296}
 297
 298/* See grab_values */
 299static void grab_commit_values(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 300{
 301        int i;
 302        struct commit *commit = (struct commit *) obj;
 303
 304        for (i = 0; i < used_atom_cnt; i++) {
 305                const char *name = used_atom[i];
 306                struct atom_value *v = &val[i];
 307                if (!!deref != (*name == '*'))
 308                        continue;
 309                if (deref)
 310                        name++;
 311                if (!strcmp(name, "tree")) {
 312                        char *s = xmalloc(41);
 313                        strcpy(s, sha1_to_hex(commit->tree->object.sha1));
 314                        v->s = s;
 315                }
 316                if (!strcmp(name, "numparent")) {
 317                        char *s = xmalloc(40);
 318                        v->ul = num_parents(commit);
 319                        sprintf(s, "%lu", v->ul);
 320                        v->s = s;
 321                }
 322                else if (!strcmp(name, "parent")) {
 323                        int num = num_parents(commit);
 324                        int i;
 325                        struct commit_list *parents;
 326                        char *s = xmalloc(41 * num + 1);
 327                        v->s = s;
 328                        for (i = 0, parents = commit->parents;
 329                             parents;
 330                             parents = parents->next, i = i + 41) {
 331                                struct commit *parent = parents->item;
 332                                strcpy(s+i, sha1_to_hex(parent->object.sha1));
 333                                if (parents->next)
 334                                        s[i+40] = ' ';
 335                        }
 336                        if (!i)
 337                                *s = '\0';
 338                }
 339        }
 340}
 341
 342static const char *find_wholine(const char *who, int wholen, const char *buf, unsigned long sz)
 343{
 344        const char *eol;
 345        while (*buf) {
 346                if (!strncmp(buf, who, wholen) &&
 347                    buf[wholen] == ' ')
 348                        return buf + wholen + 1;
 349                eol = strchr(buf, '\n');
 350                if (!eol)
 351                        return "";
 352                eol++;
 353                if (*eol == '\n')
 354                        return ""; /* end of header */
 355                buf = eol;
 356        }
 357        return "";
 358}
 359
 360static const char *copy_line(const char *buf)
 361{
 362        const char *eol = strchrnul(buf, '\n');
 363        return xmemdupz(buf, eol - buf);
 364}
 365
 366static const char *copy_name(const char *buf)
 367{
 368        const char *cp;
 369        for (cp = buf; *cp && *cp != '\n'; cp++) {
 370                if (!strncmp(cp, " <", 2))
 371                        return xmemdupz(buf, cp - buf);
 372        }
 373        return "";
 374}
 375
 376static const char *copy_email(const char *buf)
 377{
 378        const char *email = strchr(buf, '<');
 379        const char *eoemail;
 380        if (!email)
 381                return "";
 382        eoemail = strchr(email, '>');
 383        if (!eoemail)
 384                return "";
 385        return xmemdupz(email, eoemail + 1 - email);
 386}
 387
 388static char *copy_subject(const char *buf, unsigned long len)
 389{
 390        char *r = xmemdupz(buf, len);
 391        int i;
 392
 393        for (i = 0; i < len; i++)
 394                if (r[i] == '\n')
 395                        r[i] = ' ';
 396
 397        return r;
 398}
 399
 400static void grab_date(const char *buf, struct atom_value *v, const char *atomname)
 401{
 402        const char *eoemail = strstr(buf, "> ");
 403        char *zone;
 404        unsigned long timestamp;
 405        long tz;
 406        enum date_mode date_mode = DATE_NORMAL;
 407        const char *formatp;
 408
 409        /*
 410         * We got here because atomname ends in "date" or "date<something>";
 411         * it's not possible that <something> is not ":<format>" because
 412         * parse_atom() wouldn't have allowed it, so we can assume that no
 413         * ":" means no format is specified, and use the default.
 414         */
 415        formatp = strchr(atomname, ':');
 416        if (formatp != NULL) {
 417                formatp++;
 418                date_mode = parse_date_format(formatp);
 419        }
 420
 421        if (!eoemail)
 422                goto bad;
 423        timestamp = strtoul(eoemail + 2, &zone, 10);
 424        if (timestamp == ULONG_MAX)
 425                goto bad;
 426        tz = strtol(zone, NULL, 10);
 427        if ((tz == LONG_MIN || tz == LONG_MAX) && errno == ERANGE)
 428                goto bad;
 429        v->s = xstrdup(show_date(timestamp, tz, date_mode));
 430        v->ul = timestamp;
 431        return;
 432 bad:
 433        v->s = "";
 434        v->ul = 0;
 435}
 436
 437/* See grab_values */
 438static void grab_person(const char *who, struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 439{
 440        int i;
 441        int wholen = strlen(who);
 442        const char *wholine = NULL;
 443
 444        for (i = 0; i < used_atom_cnt; i++) {
 445                const char *name = used_atom[i];
 446                struct atom_value *v = &val[i];
 447                if (!!deref != (*name == '*'))
 448                        continue;
 449                if (deref)
 450                        name++;
 451                if (strncmp(who, name, wholen))
 452                        continue;
 453                if (name[wholen] != 0 &&
 454                    strcmp(name + wholen, "name") &&
 455                    strcmp(name + wholen, "email") &&
 456                    !starts_with(name + wholen, "date"))
 457                        continue;
 458                if (!wholine)
 459                        wholine = find_wholine(who, wholen, buf, sz);
 460                if (!wholine)
 461                        return; /* no point looking for it */
 462                if (name[wholen] == 0)
 463                        v->s = copy_line(wholine);
 464                else if (!strcmp(name + wholen, "name"))
 465                        v->s = copy_name(wholine);
 466                else if (!strcmp(name + wholen, "email"))
 467                        v->s = copy_email(wholine);
 468                else if (starts_with(name + wholen, "date"))
 469                        grab_date(wholine, v, name);
 470        }
 471
 472        /*
 473         * For a tag or a commit object, if "creator" or "creatordate" is
 474         * requested, do something special.
 475         */
 476        if (strcmp(who, "tagger") && strcmp(who, "committer"))
 477                return; /* "author" for commit object is not wanted */
 478        if (!wholine)
 479                wholine = find_wholine(who, wholen, buf, sz);
 480        if (!wholine)
 481                return;
 482        for (i = 0; i < used_atom_cnt; i++) {
 483                const char *name = used_atom[i];
 484                struct atom_value *v = &val[i];
 485                if (!!deref != (*name == '*'))
 486                        continue;
 487                if (deref)
 488                        name++;
 489
 490                if (starts_with(name, "creatordate"))
 491                        grab_date(wholine, v, name);
 492                else if (!strcmp(name, "creator"))
 493                        v->s = copy_line(wholine);
 494        }
 495}
 496
 497static void find_subpos(const char *buf, unsigned long sz,
 498                        const char **sub, unsigned long *sublen,
 499                        const char **body, unsigned long *bodylen,
 500                        unsigned long *nonsiglen,
 501                        const char **sig, unsigned long *siglen)
 502{
 503        const char *eol;
 504        /* skip past header until we hit empty line */
 505        while (*buf && *buf != '\n') {
 506                eol = strchrnul(buf, '\n');
 507                if (*eol)
 508                        eol++;
 509                buf = eol;
 510        }
 511        /* skip any empty lines */
 512        while (*buf == '\n')
 513                buf++;
 514
 515        /* parse signature first; we might not even have a subject line */
 516        *sig = buf + parse_signature(buf, strlen(buf));
 517        *siglen = strlen(*sig);
 518
 519        /* subject is first non-empty line */
 520        *sub = buf;
 521        /* subject goes to first empty line */
 522        while (buf < *sig && *buf && *buf != '\n') {
 523                eol = strchrnul(buf, '\n');
 524                if (*eol)
 525                        eol++;
 526                buf = eol;
 527        }
 528        *sublen = buf - *sub;
 529        /* drop trailing newline, if present */
 530        if (*sublen && (*sub)[*sublen - 1] == '\n')
 531                *sublen -= 1;
 532
 533        /* skip any empty lines */
 534        while (*buf == '\n')
 535                buf++;
 536        *body = buf;
 537        *bodylen = strlen(buf);
 538        *nonsiglen = *sig - buf;
 539}
 540
 541/* See grab_values */
 542static void grab_sub_body_contents(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 543{
 544        int i;
 545        const char *subpos = NULL, *bodypos = NULL, *sigpos = NULL;
 546        unsigned long sublen = 0, bodylen = 0, nonsiglen = 0, siglen = 0;
 547
 548        for (i = 0; i < used_atom_cnt; i++) {
 549                const char *name = used_atom[i];
 550                struct atom_value *v = &val[i];
 551                if (!!deref != (*name == '*'))
 552                        continue;
 553                if (deref)
 554                        name++;
 555                if (strcmp(name, "subject") &&
 556                    strcmp(name, "body") &&
 557                    strcmp(name, "contents") &&
 558                    strcmp(name, "contents:subject") &&
 559                    strcmp(name, "contents:body") &&
 560                    strcmp(name, "contents:signature"))
 561                        continue;
 562                if (!subpos)
 563                        find_subpos(buf, sz,
 564                                    &subpos, &sublen,
 565                                    &bodypos, &bodylen, &nonsiglen,
 566                                    &sigpos, &siglen);
 567
 568                if (!strcmp(name, "subject"))
 569                        v->s = copy_subject(subpos, sublen);
 570                else if (!strcmp(name, "contents:subject"))
 571                        v->s = copy_subject(subpos, sublen);
 572                else if (!strcmp(name, "body"))
 573                        v->s = xmemdupz(bodypos, bodylen);
 574                else if (!strcmp(name, "contents:body"))
 575                        v->s = xmemdupz(bodypos, nonsiglen);
 576                else if (!strcmp(name, "contents:signature"))
 577                        v->s = xmemdupz(sigpos, siglen);
 578                else if (!strcmp(name, "contents"))
 579                        v->s = xstrdup(subpos);
 580        }
 581}
 582
 583/*
 584 * We want to have empty print-string for field requests
 585 * that do not apply (e.g. "authordate" for a tag object)
 586 */
 587static void fill_missing_values(struct atom_value *val)
 588{
 589        int i;
 590        for (i = 0; i < used_atom_cnt; i++) {
 591                struct atom_value *v = &val[i];
 592                if (v->s == NULL)
 593                        v->s = "";
 594        }
 595}
 596
 597/*
 598 * val is a list of atom_value to hold returned values.  Extract
 599 * the values for atoms in used_atom array out of (obj, buf, sz).
 600 * when deref is false, (obj, buf, sz) is the object that is
 601 * pointed at by the ref itself; otherwise it is the object the
 602 * ref (which is a tag) refers to.
 603 */
 604static void grab_values(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 605{
 606        grab_common_values(val, deref, obj, buf, sz);
 607        switch (obj->type) {
 608        case OBJ_TAG:
 609                grab_tag_values(val, deref, obj, buf, sz);
 610                grab_sub_body_contents(val, deref, obj, buf, sz);
 611                grab_person("tagger", val, deref, obj, buf, sz);
 612                break;
 613        case OBJ_COMMIT:
 614                grab_commit_values(val, deref, obj, buf, sz);
 615                grab_sub_body_contents(val, deref, obj, buf, sz);
 616                grab_person("author", val, deref, obj, buf, sz);
 617                grab_person("committer", val, deref, obj, buf, sz);
 618                break;
 619        case OBJ_TREE:
 620                /* grab_tree_values(val, deref, obj, buf, sz); */
 621                break;
 622        case OBJ_BLOB:
 623                /* grab_blob_values(val, deref, obj, buf, sz); */
 624                break;
 625        default:
 626                die("Eh?  Object of type %d?", obj->type);
 627        }
 628}
 629
 630static inline char *copy_advance(char *dst, const char *src)
 631{
 632        while (*src)
 633                *dst++ = *src++;
 634        return dst;
 635}
 636
 637/*
 638 * Parse the object referred by ref, and grab needed value.
 639 */
 640static void populate_value(struct refinfo *ref)
 641{
 642        void *buf;
 643        struct object *obj;
 644        int eaten, i;
 645        unsigned long size;
 646        const unsigned char *tagged;
 647
 648        ref->value = xcalloc(sizeof(struct atom_value), used_atom_cnt);
 649
 650        if (need_symref && (ref->flag & REF_ISSYMREF) && !ref->symref) {
 651                unsigned char unused1[20];
 652                ref->symref = resolve_refdup(ref->refname, unused1, 1, NULL);
 653                if (!ref->symref)
 654                        ref->symref = "";
 655        }
 656
 657        /* Fill in specials first */
 658        for (i = 0; i < used_atom_cnt; i++) {
 659                const char *name = used_atom[i];
 660                struct atom_value *v = &ref->value[i];
 661                int deref = 0;
 662                const char *refname;
 663                const char *formatp;
 664                struct branch *branch = NULL;
 665
 666                if (*name == '*') {
 667                        deref = 1;
 668                        name++;
 669                }
 670
 671                if (starts_with(name, "refname"))
 672                        refname = ref->refname;
 673                else if (starts_with(name, "symref"))
 674                        refname = ref->symref ? ref->symref : "";
 675                else if (starts_with(name, "upstream")) {
 676                        /* only local branches may have an upstream */
 677                        if (!starts_with(ref->refname, "refs/heads/"))
 678                                continue;
 679                        branch = branch_get(ref->refname + 11);
 680
 681                        if (!branch || !branch->merge || !branch->merge[0] ||
 682                            !branch->merge[0]->dst)
 683                                continue;
 684                        refname = branch->merge[0]->dst;
 685                } else if (starts_with(name, "color:")) {
 686                        char color[COLOR_MAXLEN] = "";
 687
 688                        color_parse(name + 6, "--format", color);
 689                        v->s = xstrdup(color);
 690                        continue;
 691                } else if (!strcmp(name, "flag")) {
 692                        char buf[256], *cp = buf;
 693                        if (ref->flag & REF_ISSYMREF)
 694                                cp = copy_advance(cp, ",symref");
 695                        if (ref->flag & REF_ISPACKED)
 696                                cp = copy_advance(cp, ",packed");
 697                        if (cp == buf)
 698                                v->s = "";
 699                        else {
 700                                *cp = '\0';
 701                                v->s = xstrdup(buf + 1);
 702                        }
 703                        continue;
 704                } else if (!deref && grab_objectname(name, ref->objectname, v)) {
 705                        continue;
 706                } else if (!strcmp(name, "HEAD")) {
 707                        const char *head;
 708                        unsigned char sha1[20];
 709
 710                        head = resolve_ref_unsafe("HEAD", sha1, 1, NULL);
 711                        if (!strcmp(ref->refname, head))
 712                                v->s = "*";
 713                        else
 714                                v->s = " ";
 715                        continue;
 716                } else
 717                        continue;
 718
 719                formatp = strchr(name, ':');
 720                if (formatp) {
 721                        int num_ours, num_theirs;
 722
 723                        formatp++;
 724                        if (!strcmp(formatp, "short"))
 725                                refname = shorten_unambiguous_ref(refname,
 726                                                      warn_ambiguous_refs);
 727                        else if (!strcmp(formatp, "track") &&
 728                                 starts_with(name, "upstream")) {
 729                                char buf[40];
 730
 731                                stat_tracking_info(branch, &num_ours, &num_theirs);
 732                                if (!num_ours && !num_theirs)
 733                                        v->s = "";
 734                                else if (!num_ours) {
 735                                        sprintf(buf, "[behind %d]", num_theirs);
 736                                        v->s = xstrdup(buf);
 737                                } else if (!num_theirs) {
 738                                        sprintf(buf, "[ahead %d]", num_ours);
 739                                        v->s = xstrdup(buf);
 740                                } else {
 741                                        sprintf(buf, "[ahead %d, behind %d]",
 742                                                num_ours, num_theirs);
 743                                        v->s = xstrdup(buf);
 744                                }
 745                                continue;
 746                        } else if (!strcmp(formatp, "trackshort") &&
 747                                   starts_with(name, "upstream")) {
 748                                assert(branch);
 749                                stat_tracking_info(branch, &num_ours, &num_theirs);
 750                                if (!num_ours && !num_theirs)
 751                                        v->s = "=";
 752                                else if (!num_ours)
 753                                        v->s = "<";
 754                                else if (!num_theirs)
 755                                        v->s = ">";
 756                                else
 757                                        v->s = "<>";
 758                                continue;
 759                        } else
 760                                die("unknown %.*s format %s",
 761                                    (int)(formatp - name), name, formatp);
 762                }
 763
 764                if (!deref)
 765                        v->s = refname;
 766                else {
 767                        int len = strlen(refname);
 768                        char *s = xmalloc(len + 4);
 769                        sprintf(s, "%s^{}", refname);
 770                        v->s = s;
 771                }
 772        }
 773
 774        for (i = 0; i < used_atom_cnt; i++) {
 775                struct atom_value *v = &ref->value[i];
 776                if (v->s == NULL)
 777                        goto need_obj;
 778        }
 779        return;
 780
 781 need_obj:
 782        buf = get_obj(ref->objectname, &obj, &size, &eaten);
 783        if (!buf)
 784                die("missing object %s for %s",
 785                    sha1_to_hex(ref->objectname), ref->refname);
 786        if (!obj)
 787                die("parse_object_buffer failed on %s for %s",
 788                    sha1_to_hex(ref->objectname), ref->refname);
 789
 790        grab_values(ref->value, 0, obj, buf, size);
 791        if (!eaten)
 792                free(buf);
 793
 794        /*
 795         * If there is no atom that wants to know about tagged
 796         * object, we are done.
 797         */
 798        if (!need_tagged || (obj->type != OBJ_TAG))
 799                return;
 800
 801        /*
 802         * If it is a tag object, see if we use a value that derefs
 803         * the object, and if we do grab the object it refers to.
 804         */
 805        tagged = ((struct tag *)obj)->tagged->sha1;
 806
 807        /*
 808         * NEEDSWORK: This derefs tag only once, which
 809         * is good to deal with chains of trust, but
 810         * is not consistent with what deref_tag() does
 811         * which peels the onion to the core.
 812         */
 813        buf = get_obj(tagged, &obj, &size, &eaten);
 814        if (!buf)
 815                die("missing object %s for %s",
 816                    sha1_to_hex(tagged), ref->refname);
 817        if (!obj)
 818                die("parse_object_buffer failed on %s for %s",
 819                    sha1_to_hex(tagged), ref->refname);
 820        grab_values(ref->value, 1, obj, buf, size);
 821        if (!eaten)
 822                free(buf);
 823}
 824
 825/*
 826 * Given a ref, return the value for the atom.  This lazily gets value
 827 * out of the object by calling populate value.
 828 */
 829static void get_value(struct refinfo *ref, int atom, struct atom_value **v)
 830{
 831        if (!ref->value) {
 832                populate_value(ref);
 833                fill_missing_values(ref->value);
 834        }
 835        *v = &ref->value[atom];
 836}
 837
 838struct grab_ref_cbdata {
 839        struct refinfo **grab_array;
 840        const char **grab_pattern;
 841        int grab_cnt;
 842};
 843
 844/*
 845 * A call-back given to for_each_ref().  Filter refs and keep them for
 846 * later object processing.
 847 */
 848static int grab_single_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 849{
 850        struct grab_ref_cbdata *cb = cb_data;
 851        struct refinfo *ref;
 852        int cnt;
 853
 854        if (*cb->grab_pattern) {
 855                const char **pattern;
 856                int namelen = strlen(refname);
 857                for (pattern = cb->grab_pattern; *pattern; pattern++) {
 858                        const char *p = *pattern;
 859                        int plen = strlen(p);
 860
 861                        if ((plen <= namelen) &&
 862                            !strncmp(refname, p, plen) &&
 863                            (refname[plen] == '\0' ||
 864                             refname[plen] == '/' ||
 865                             p[plen-1] == '/'))
 866                                break;
 867                        if (!wildmatch(p, refname, WM_PATHNAME, NULL))
 868                                break;
 869                }
 870                if (!*pattern)
 871                        return 0;
 872        }
 873
 874        /*
 875         * We do not open the object yet; sort may only need refname
 876         * to do its job and the resulting list may yet to be pruned
 877         * by maxcount logic.
 878         */
 879        ref = xcalloc(1, sizeof(*ref));
 880        ref->refname = xstrdup(refname);
 881        hashcpy(ref->objectname, sha1);
 882        ref->flag = flag;
 883
 884        cnt = cb->grab_cnt;
 885        cb->grab_array = xrealloc(cb->grab_array,
 886                                  sizeof(*cb->grab_array) * (cnt + 1));
 887        cb->grab_array[cnt++] = ref;
 888        cb->grab_cnt = cnt;
 889        return 0;
 890}
 891
 892static int cmp_ref_sort(struct ref_sort *s, struct refinfo *a, struct refinfo *b)
 893{
 894        struct atom_value *va, *vb;
 895        int cmp;
 896        cmp_type cmp_type = used_atom_type[s->atom];
 897
 898        get_value(a, s->atom, &va);
 899        get_value(b, s->atom, &vb);
 900        switch (cmp_type) {
 901        case FIELD_STR:
 902                cmp = strcmp(va->s, vb->s);
 903                break;
 904        default:
 905                if (va->ul < vb->ul)
 906                        cmp = -1;
 907                else if (va->ul == vb->ul)
 908                        cmp = 0;
 909                else
 910                        cmp = 1;
 911                break;
 912        }
 913        return (s->reverse) ? -cmp : cmp;
 914}
 915
 916static struct ref_sort *ref_sort;
 917static int compare_refs(const void *a_, const void *b_)
 918{
 919        struct refinfo *a = *((struct refinfo **)a_);
 920        struct refinfo *b = *((struct refinfo **)b_);
 921        struct ref_sort *s;
 922
 923        for (s = ref_sort; s; s = s->next) {
 924                int cmp = cmp_ref_sort(s, a, b);
 925                if (cmp)
 926                        return cmp;
 927        }
 928        return 0;
 929}
 930
 931static void sort_refs(struct ref_sort *sort, struct refinfo **refs, int num_refs)
 932{
 933        ref_sort = sort;
 934        qsort(refs, num_refs, sizeof(struct refinfo *), compare_refs);
 935}
 936
 937static void print_value(struct atom_value *v, int quote_style)
 938{
 939        struct strbuf sb = STRBUF_INIT;
 940        switch (quote_style) {
 941        case QUOTE_NONE:
 942                fputs(v->s, stdout);
 943                break;
 944        case QUOTE_SHELL:
 945                sq_quote_buf(&sb, v->s);
 946                break;
 947        case QUOTE_PERL:
 948                perl_quote_buf(&sb, v->s);
 949                break;
 950        case QUOTE_PYTHON:
 951                python_quote_buf(&sb, v->s);
 952                break;
 953        case QUOTE_TCL:
 954                tcl_quote_buf(&sb, v->s);
 955                break;
 956        }
 957        if (quote_style != QUOTE_NONE) {
 958                fputs(sb.buf, stdout);
 959                strbuf_release(&sb);
 960        }
 961}
 962
 963static int hex1(char ch)
 964{
 965        if ('0' <= ch && ch <= '9')
 966                return ch - '0';
 967        else if ('a' <= ch && ch <= 'f')
 968                return ch - 'a' + 10;
 969        else if ('A' <= ch && ch <= 'F')
 970                return ch - 'A' + 10;
 971        return -1;
 972}
 973static int hex2(const char *cp)
 974{
 975        if (cp[0] && cp[1])
 976                return (hex1(cp[0]) << 4) | hex1(cp[1]);
 977        else
 978                return -1;
 979}
 980
 981static void emit(const char *cp, const char *ep)
 982{
 983        while (*cp && (!ep || cp < ep)) {
 984                if (*cp == '%') {
 985                        if (cp[1] == '%')
 986                                cp++;
 987                        else {
 988                                int ch = hex2(cp + 1);
 989                                if (0 <= ch) {
 990                                        putchar(ch);
 991                                        cp += 3;
 992                                        continue;
 993                                }
 994                        }
 995                }
 996                putchar(*cp);
 997                cp++;
 998        }
 999}
1000
1001static void show_ref(struct refinfo *info, const char *format, int quote_style)
1002{
1003        const char *cp, *sp, *ep;
1004
1005        for (cp = format; *cp && (sp = find_next(cp)); cp = ep + 1) {
1006                struct atom_value *atomv;
1007
1008                ep = strchr(sp, ')');
1009                if (cp < sp)
1010                        emit(cp, sp);
1011                get_value(info, parse_atom(sp + 2, ep), &atomv);
1012                print_value(atomv, quote_style);
1013        }
1014        if (*cp) {
1015                sp = cp + strlen(cp);
1016                emit(cp, sp);
1017        }
1018        if (need_color_reset_at_eol) {
1019                struct atom_value resetv;
1020                char color[COLOR_MAXLEN] = "";
1021
1022                color_parse("reset", "--format", color);
1023                resetv.s = color;
1024                print_value(&resetv, quote_style);
1025        }
1026        putchar('\n');
1027}
1028
1029static struct ref_sort *default_sort(void)
1030{
1031        static const char cstr_name[] = "refname";
1032
1033        struct ref_sort *sort = xcalloc(1, sizeof(*sort));
1034
1035        sort->next = NULL;
1036        sort->atom = parse_atom(cstr_name, cstr_name + strlen(cstr_name));
1037        return sort;
1038}
1039
1040static int opt_parse_sort(const struct option *opt, const char *arg, int unset)
1041{
1042        struct ref_sort **sort_tail = opt->value;
1043        struct ref_sort *s;
1044        int len;
1045
1046        if (!arg) /* should --no-sort void the list ? */
1047                return -1;
1048
1049        s = xcalloc(1, sizeof(*s));
1050        s->next = *sort_tail;
1051        *sort_tail = s;
1052
1053        if (*arg == '-') {
1054                s->reverse = 1;
1055                arg++;
1056        }
1057        len = strlen(arg);
1058        s->atom = parse_atom(arg, arg+len);
1059        return 0;
1060}
1061
1062static char const * const for_each_ref_usage[] = {
1063        N_("git for-each-ref [options] [<pattern>]"),
1064        NULL
1065};
1066
1067int cmd_for_each_ref(int argc, const char **argv, const char *prefix)
1068{
1069        int i, num_refs;
1070        const char *format = "%(objectname) %(objecttype)\t%(refname)";
1071        struct ref_sort *sort = NULL, **sort_tail = &sort;
1072        int maxcount = 0, quote_style = 0;
1073        struct refinfo **refs;
1074        struct grab_ref_cbdata cbdata;
1075
1076        struct option opts[] = {
1077                OPT_BIT('s', "shell", &quote_style,
1078                        N_("quote placeholders suitably for shells"), QUOTE_SHELL),
1079                OPT_BIT('p', "perl",  &quote_style,
1080                        N_("quote placeholders suitably for perl"), QUOTE_PERL),
1081                OPT_BIT(0 , "python", &quote_style,
1082                        N_("quote placeholders suitably for python"), QUOTE_PYTHON),
1083                OPT_BIT(0 , "tcl",  &quote_style,
1084                        N_("quote placeholders suitably for tcl"), QUOTE_TCL),
1085
1086                OPT_GROUP(""),
1087                OPT_INTEGER( 0 , "count", &maxcount, N_("show only <n> matched refs")),
1088                OPT_STRING(  0 , "format", &format, N_("format"), N_("format to use for the output")),
1089                OPT_CALLBACK(0 , "sort", sort_tail, N_("key"),
1090                            N_("field name to sort on"), &opt_parse_sort),
1091                OPT_END(),
1092        };
1093
1094        parse_options(argc, argv, prefix, opts, for_each_ref_usage, 0);
1095        if (maxcount < 0) {
1096                error("invalid --count argument: `%d'", maxcount);
1097                usage_with_options(for_each_ref_usage, opts);
1098        }
1099        if (HAS_MULTI_BITS(quote_style)) {
1100                error("more than one quoting style?");
1101                usage_with_options(for_each_ref_usage, opts);
1102        }
1103        if (verify_format(format))
1104                usage_with_options(for_each_ref_usage, opts);
1105
1106        if (!sort)
1107                sort = default_sort();
1108
1109        /* for warn_ambiguous_refs */
1110        git_config(git_default_config, NULL);
1111
1112        memset(&cbdata, 0, sizeof(cbdata));
1113        cbdata.grab_pattern = argv;
1114        for_each_rawref(grab_single_ref, &cbdata);
1115        refs = cbdata.grab_array;
1116        num_refs = cbdata.grab_cnt;
1117
1118        sort_refs(sort, refs, num_refs);
1119
1120        if (!maxcount || num_refs < maxcount)
1121                maxcount = num_refs;
1122        for (i = 0; i < maxcount; i++)
1123                show_ref(refs[i], format, quote_style);
1124        return 0;
1125}