Andrew's git / gitweb.git / commit.c
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commit.con commit Use the asyncronous function infrastructure in builtin-fetch-pack.c. (088fab5)
   1#include "cache.h"
   2#include "tag.h"
   3#include "commit.h"
   4#include "pkt-line.h"
   5#include "utf8.h"
   6#include "interpolate.h"
   7#include "diff.h"
   8#include "revision.h"
   9
  10int save_commit_buffer = 1;
  11
  12struct sort_node
  13{
  14        /*
  15         * the number of children of the associated commit
  16         * that also occur in the list being sorted.
  17         */
  18        unsigned int indegree;
  19
  20        /*
  21         * reference to original list item that we will re-use
  22         * on output.
  23         */
  24        struct commit_list * list_item;
  25
  26};
  27
  28const char *commit_type = "commit";
  29
  30static struct cmt_fmt_map {
  31        const char *n;
  32        size_t cmp_len;
  33        enum cmit_fmt v;
  34} cmt_fmts[] = {
  35        { "raw",        1,      CMIT_FMT_RAW },
  36        { "medium",     1,      CMIT_FMT_MEDIUM },
  37        { "short",      1,      CMIT_FMT_SHORT },
  38        { "email",      1,      CMIT_FMT_EMAIL },
  39        { "full",       5,      CMIT_FMT_FULL },
  40        { "fuller",     5,      CMIT_FMT_FULLER },
  41        { "oneline",    1,      CMIT_FMT_ONELINE },
  42        { "format:",    7,      CMIT_FMT_USERFORMAT},
  43};
  44
  45static char *user_format;
  46
  47enum cmit_fmt get_commit_format(const char *arg)
  48{
  49        int i;
  50
  51        if (!arg || !*arg)
  52                return CMIT_FMT_DEFAULT;
  53        if (*arg == '=')
  54                arg++;
  55        if (!prefixcmp(arg, "format:")) {
  56                if (user_format)
  57                        free(user_format);
  58                user_format = xstrdup(arg + 7);
  59                return CMIT_FMT_USERFORMAT;
  60        }
  61        for (i = 0; i < ARRAY_SIZE(cmt_fmts); i++) {
  62                if (!strncmp(arg, cmt_fmts[i].n, cmt_fmts[i].cmp_len) &&
  63                    !strncmp(arg, cmt_fmts[i].n, strlen(arg)))
  64                        return cmt_fmts[i].v;
  65        }
  66
  67        die("invalid --pretty format: %s", arg);
  68}
  69
  70static struct commit *check_commit(struct object *obj,
  71                                   const unsigned char *sha1,
  72                                   int quiet)
  73{
  74        if (obj->type != OBJ_COMMIT) {
  75                if (!quiet)
  76                        error("Object %s is a %s, not a commit",
  77                              sha1_to_hex(sha1), typename(obj->type));
  78                return NULL;
  79        }
  80        return (struct commit *) obj;
  81}
  82
  83struct commit *lookup_commit_reference_gently(const unsigned char *sha1,
  84                                              int quiet)
  85{
  86        struct object *obj = deref_tag(parse_object(sha1), NULL, 0);
  87
  88        if (!obj)
  89                return NULL;
  90        return check_commit(obj, sha1, quiet);
  91}
  92
  93struct commit *lookup_commit_reference(const unsigned char *sha1)
  94{
  95        return lookup_commit_reference_gently(sha1, 0);
  96}
  97
  98struct commit *lookup_commit(const unsigned char *sha1)
  99{
 100        struct object *obj = lookup_object(sha1);
 101        if (!obj)
 102                return create_object(sha1, OBJ_COMMIT, alloc_commit_node());
 103        if (!obj->type)
 104                obj->type = OBJ_COMMIT;
 105        return check_commit(obj, sha1, 0);
 106}
 107
 108static unsigned long parse_commit_date(const char *buf)
 109{
 110        unsigned long date;
 111
 112        if (memcmp(buf, "author", 6))
 113                return 0;
 114        while (*buf++ != '\n')
 115                /* nada */;
 116        if (memcmp(buf, "committer", 9))
 117                return 0;
 118        while (*buf++ != '>')
 119                /* nada */;
 120        date = strtoul(buf, NULL, 10);
 121        if (date == ULONG_MAX)
 122                date = 0;
 123        return date;
 124}
 125
 126static struct commit_graft **commit_graft;
 127static int commit_graft_alloc, commit_graft_nr;
 128
 129static int commit_graft_pos(const unsigned char *sha1)
 130{
 131        int lo, hi;
 132        lo = 0;
 133        hi = commit_graft_nr;
 134        while (lo < hi) {
 135                int mi = (lo + hi) / 2;
 136                struct commit_graft *graft = commit_graft[mi];
 137                int cmp = hashcmp(sha1, graft->sha1);
 138                if (!cmp)
 139                        return mi;
 140                if (cmp < 0)
 141                        hi = mi;
 142                else
 143                        lo = mi + 1;
 144        }
 145        return -lo - 1;
 146}
 147
 148int register_commit_graft(struct commit_graft *graft, int ignore_dups)
 149{
 150        int pos = commit_graft_pos(graft->sha1);
 151
 152        if (0 <= pos) {
 153                if (ignore_dups)
 154                        free(graft);
 155                else {
 156                        free(commit_graft[pos]);
 157                        commit_graft[pos] = graft;
 158                }
 159                return 1;
 160        }
 161        pos = -pos - 1;
 162        if (commit_graft_alloc <= ++commit_graft_nr) {
 163                commit_graft_alloc = alloc_nr(commit_graft_alloc);
 164                commit_graft = xrealloc(commit_graft,
 165                                        sizeof(*commit_graft) *
 166                                        commit_graft_alloc);
 167        }
 168        if (pos < commit_graft_nr)
 169                memmove(commit_graft + pos + 1,
 170                        commit_graft + pos,
 171                        (commit_graft_nr - pos - 1) *
 172                        sizeof(*commit_graft));
 173        commit_graft[pos] = graft;
 174        return 0;
 175}
 176
 177struct commit_graft *read_graft_line(char *buf, int len)
 178{
 179        /* The format is just "Commit Parent1 Parent2 ...\n" */
 180        int i;
 181        struct commit_graft *graft = NULL;
 182
 183        if (buf[len-1] == '\n')
 184                buf[--len] = 0;
 185        if (buf[0] == '#' || buf[0] == '\0')
 186                return NULL;
 187        if ((len + 1) % 41) {
 188        bad_graft_data:
 189                error("bad graft data: %s", buf);
 190                free(graft);
 191                return NULL;
 192        }
 193        i = (len + 1) / 41 - 1;
 194        graft = xmalloc(sizeof(*graft) + 20 * i);
 195        graft->nr_parent = i;
 196        if (get_sha1_hex(buf, graft->sha1))
 197                goto bad_graft_data;
 198        for (i = 40; i < len; i += 41) {
 199                if (buf[i] != ' ')
 200                        goto bad_graft_data;
 201                if (get_sha1_hex(buf + i + 1, graft->parent[i/41]))
 202                        goto bad_graft_data;
 203        }
 204        return graft;
 205}
 206
 207int read_graft_file(const char *graft_file)
 208{
 209        FILE *fp = fopen(graft_file, "r");
 210        char buf[1024];
 211        if (!fp)
 212                return -1;
 213        while (fgets(buf, sizeof(buf), fp)) {
 214                /* The format is just "Commit Parent1 Parent2 ...\n" */
 215                int len = strlen(buf);
 216                struct commit_graft *graft = read_graft_line(buf, len);
 217                if (!graft)
 218                        continue;
 219                if (register_commit_graft(graft, 1))
 220                        error("duplicate graft data: %s", buf);
 221        }
 222        fclose(fp);
 223        return 0;
 224}
 225
 226static void prepare_commit_graft(void)
 227{
 228        static int commit_graft_prepared;
 229        char *graft_file;
 230
 231        if (commit_graft_prepared)
 232                return;
 233        graft_file = get_graft_file();
 234        read_graft_file(graft_file);
 235        /* make sure shallows are read */
 236        is_repository_shallow();
 237        commit_graft_prepared = 1;
 238}
 239
 240static struct commit_graft *lookup_commit_graft(const unsigned char *sha1)
 241{
 242        int pos;
 243        prepare_commit_graft();
 244        pos = commit_graft_pos(sha1);
 245        if (pos < 0)
 246                return NULL;
 247        return commit_graft[pos];
 248}
 249
 250int write_shallow_commits(int fd, int use_pack_protocol)
 251{
 252        int i, count = 0;
 253        for (i = 0; i < commit_graft_nr; i++)
 254                if (commit_graft[i]->nr_parent < 0) {
 255                        const char *hex =
 256                                sha1_to_hex(commit_graft[i]->sha1);
 257                        count++;
 258                        if (use_pack_protocol)
 259                                packet_write(fd, "shallow %s", hex);
 260                        else {
 261                                if (write_in_full(fd, hex,  40) != 40)
 262                                        break;
 263                                if (write_in_full(fd, "\n", 1) != 1)
 264                                        break;
 265                        }
 266                }
 267        return count;
 268}
 269
 270int unregister_shallow(const unsigned char *sha1)
 271{
 272        int pos = commit_graft_pos(sha1);
 273        if (pos < 0)
 274                return -1;
 275        if (pos + 1 < commit_graft_nr)
 276                memcpy(commit_graft + pos, commit_graft + pos + 1,
 277                                sizeof(struct commit_graft *)
 278                                * (commit_graft_nr - pos - 1));
 279        commit_graft_nr--;
 280        return 0;
 281}
 282
 283int parse_commit_buffer(struct commit *item, void *buffer, unsigned long size)
 284{
 285        char *tail = buffer;
 286        char *bufptr = buffer;
 287        unsigned char parent[20];
 288        struct commit_list **pptr;
 289        struct commit_graft *graft;
 290        unsigned n_refs = 0;
 291
 292        if (item->object.parsed)
 293                return 0;
 294        item->object.parsed = 1;
 295        tail += size;
 296        if (tail <= bufptr + 5 || memcmp(bufptr, "tree ", 5))
 297                return error("bogus commit object %s", sha1_to_hex(item->object.sha1));
 298        if (tail <= bufptr + 45 || get_sha1_hex(bufptr + 5, parent) < 0)
 299                return error("bad tree pointer in commit %s",
 300                             sha1_to_hex(item->object.sha1));
 301        item->tree = lookup_tree(parent);
 302        if (item->tree)
 303                n_refs++;
 304        bufptr += 46; /* "tree " + "hex sha1" + "\n" */
 305        pptr = &item->parents;
 306
 307        graft = lookup_commit_graft(item->object.sha1);
 308        while (bufptr + 48 < tail && !memcmp(bufptr, "parent ", 7)) {
 309                struct commit *new_parent;
 310
 311                if (tail <= bufptr + 48 ||
 312                    get_sha1_hex(bufptr + 7, parent) ||
 313                    bufptr[47] != '\n')
 314                        return error("bad parents in commit %s", sha1_to_hex(item->object.sha1));
 315                bufptr += 48;
 316                if (graft)
 317                        continue;
 318                new_parent = lookup_commit(parent);
 319                if (new_parent) {
 320                        pptr = &commit_list_insert(new_parent, pptr)->next;
 321                        n_refs++;
 322                }
 323        }
 324        if (graft) {
 325                int i;
 326                struct commit *new_parent;
 327                for (i = 0; i < graft->nr_parent; i++) {
 328                        new_parent = lookup_commit(graft->parent[i]);
 329                        if (!new_parent)
 330                                continue;
 331                        pptr = &commit_list_insert(new_parent, pptr)->next;
 332                        n_refs++;
 333                }
 334        }
 335        item->date = parse_commit_date(bufptr);
 336
 337        if (track_object_refs) {
 338                unsigned i = 0;
 339                struct commit_list *p;
 340                struct object_refs *refs = alloc_object_refs(n_refs);
 341                if (item->tree)
 342                        refs->ref[i++] = &item->tree->object;
 343                for (p = item->parents; p; p = p->next)
 344                        refs->ref[i++] = &p->item->object;
 345                set_object_refs(&item->object, refs);
 346        }
 347
 348        return 0;
 349}
 350
 351int parse_commit(struct commit *item)
 352{
 353        enum object_type type;
 354        void *buffer;
 355        unsigned long size;
 356        int ret;
 357
 358        if (item->object.parsed)
 359                return 0;
 360        buffer = read_sha1_file(item->object.sha1, &type, &size);
 361        if (!buffer)
 362                return error("Could not read %s",
 363                             sha1_to_hex(item->object.sha1));
 364        if (type != OBJ_COMMIT) {
 365                free(buffer);
 366                return error("Object %s not a commit",
 367                             sha1_to_hex(item->object.sha1));
 368        }
 369        ret = parse_commit_buffer(item, buffer, size);
 370        if (save_commit_buffer && !ret) {
 371                item->buffer = buffer;
 372                return 0;
 373        }
 374        free(buffer);
 375        return ret;
 376}
 377
 378struct commit_list *commit_list_insert(struct commit *item, struct commit_list **list_p)
 379{
 380        struct commit_list *new_list = xmalloc(sizeof(struct commit_list));
 381        new_list->item = item;
 382        new_list->next = *list_p;
 383        *list_p = new_list;
 384        return new_list;
 385}
 386
 387void free_commit_list(struct commit_list *list)
 388{
 389        while (list) {
 390                struct commit_list *temp = list;
 391                list = temp->next;
 392                free(temp);
 393        }
 394}
 395
 396struct commit_list * insert_by_date(struct commit *item, struct commit_list **list)
 397{
 398        struct commit_list **pp = list;
 399        struct commit_list *p;
 400        while ((p = *pp) != NULL) {
 401                if (p->item->date < item->date) {
 402                        break;
 403                }
 404                pp = &p->next;
 405        }
 406        return commit_list_insert(item, pp);
 407}
 408
 409
 410void sort_by_date(struct commit_list **list)
 411{
 412        struct commit_list *ret = NULL;
 413        while (*list) {
 414                insert_by_date((*list)->item, &ret);
 415                *list = (*list)->next;
 416        }
 417        *list = ret;
 418}
 419
 420struct commit *pop_most_recent_commit(struct commit_list **list,
 421                                      unsigned int mark)
 422{
 423        struct commit *ret = (*list)->item;
 424        struct commit_list *parents = ret->parents;
 425        struct commit_list *old = *list;
 426
 427        *list = (*list)->next;
 428        free(old);
 429
 430        while (parents) {
 431                struct commit *commit = parents->item;
 432                parse_commit(commit);
 433                if (!(commit->object.flags & mark)) {
 434                        commit->object.flags |= mark;
 435                        insert_by_date(commit, list);
 436                }
 437                parents = parents->next;
 438        }
 439        return ret;
 440}
 441
 442void clear_commit_marks(struct commit *commit, unsigned int mark)
 443{
 444        while (commit) {
 445                struct commit_list *parents;
 446
 447                if (!(mark & commit->object.flags))
 448                        return;
 449
 450                commit->object.flags &= ~mark;
 451
 452                parents = commit->parents;
 453                if (!parents)
 454                        return;
 455
 456                while ((parents = parents->next))
 457                        clear_commit_marks(parents->item, mark);
 458
 459                commit = commit->parents->item;
 460        }
 461}
 462
 463/*
 464 * Generic support for pretty-printing the header
 465 */
 466static int get_one_line(const char *msg)
 467{
 468        int ret = 0;
 469
 470        for (;;) {
 471                char c = *msg++;
 472                if (!c)
 473                        break;
 474                ret++;
 475                if (c == '\n')
 476                        break;
 477        }
 478        return ret;
 479}
 480
 481/* High bit set, or ISO-2022-INT */
 482static int non_ascii(int ch)
 483{
 484        ch = (ch & 0xff);
 485        return ((ch & 0x80) || (ch == 0x1b));
 486}
 487
 488static int is_rfc2047_special(char ch)
 489{
 490        return (non_ascii(ch) || (ch == '=') || (ch == '?') || (ch == '_'));
 491}
 492
 493static void add_rfc2047(struct strbuf *sb, const char *line, int len,
 494                       const char *encoding)
 495{
 496        int i, last;
 497
 498        for (i = 0; i < len; i++) {
 499                int ch = line[i];
 500                if (non_ascii(ch))
 501                        goto needquote;
 502                if ((i + 1 < len) && (ch == '=' && line[i+1] == '?'))
 503                        goto needquote;
 504        }
 505        strbuf_add(sb, line, len);
 506        return;
 507
 508needquote:
 509        strbuf_grow(sb, len * 3 + strlen(encoding) + 100);
 510        strbuf_addf(sb, "=?%s?q?", encoding);
 511        for (i = last = 0; i < len; i++) {
 512                unsigned ch = line[i] & 0xFF;
 513                /*
 514                 * We encode ' ' using '=20' even though rfc2047
 515                 * allows using '_' for readability.  Unfortunately,
 516                 * many programs do not understand this and just
 517                 * leave the underscore in place.
 518                 */
 519                if (is_rfc2047_special(ch) || ch == ' ') {
 520                        strbuf_add(sb, line + last, i - last);
 521                        strbuf_addf(sb, "=%02X", ch);
 522                        last = i + 1;
 523                }
 524        }
 525        strbuf_add(sb, line + last, len - last);
 526        strbuf_addstr(sb, "?=");
 527}
 528
 529static void add_user_info(const char *what, enum cmit_fmt fmt, struct strbuf *sb,
 530                         const char *line, enum date_mode dmode,
 531                         const char *encoding)
 532{
 533        char *date;
 534        int namelen;
 535        unsigned long time;
 536        int tz;
 537        const char *filler = "    ";
 538
 539        if (fmt == CMIT_FMT_ONELINE)
 540                return;
 541        date = strchr(line, '>');
 542        if (!date)
 543                return;
 544        namelen = ++date - line;
 545        time = strtoul(date, &date, 10);
 546        tz = strtol(date, NULL, 10);
 547
 548        if (fmt == CMIT_FMT_EMAIL) {
 549                char *name_tail = strchr(line, '<');
 550                int display_name_length;
 551                if (!name_tail)
 552                        return;
 553                while (line < name_tail && isspace(name_tail[-1]))
 554                        name_tail--;
 555                display_name_length = name_tail - line;
 556                filler = "";
 557                strbuf_addstr(sb, "From: ");
 558                add_rfc2047(sb, line, display_name_length, encoding);
 559                strbuf_add(sb, name_tail, namelen - display_name_length);
 560                strbuf_addch(sb, '\n');
 561        } else {
 562                strbuf_addf(sb, "%s: %.*s%.*s\n", what,
 563                              (fmt == CMIT_FMT_FULLER) ? 4 : 0,
 564                              filler, namelen, line);
 565        }
 566        switch (fmt) {
 567        case CMIT_FMT_MEDIUM:
 568                strbuf_addf(sb, "Date:   %s\n", show_date(time, tz, dmode));
 569                break;
 570        case CMIT_FMT_EMAIL:
 571                strbuf_addf(sb, "Date: %s\n", show_date(time, tz, DATE_RFC2822));
 572                break;
 573        case CMIT_FMT_FULLER:
 574                strbuf_addf(sb, "%sDate: %s\n", what, show_date(time, tz, dmode));
 575                break;
 576        default:
 577                /* notin' */
 578                break;
 579        }
 580}
 581
 582static int is_empty_line(const char *line, int *len_p)
 583{
 584        int len = *len_p;
 585        while (len && isspace(line[len-1]))
 586                len--;
 587        *len_p = len;
 588        return !len;
 589}
 590
 591static void add_merge_info(enum cmit_fmt fmt, struct strbuf *sb,
 592                        const struct commit *commit, int abbrev)
 593{
 594        struct commit_list *parent = commit->parents;
 595
 596        if ((fmt == CMIT_FMT_ONELINE) || (fmt == CMIT_FMT_EMAIL) ||
 597            !parent || !parent->next)
 598                return;
 599
 600        strbuf_addstr(sb, "Merge:");
 601
 602        while (parent) {
 603                struct commit *p = parent->item;
 604                const char *hex = NULL;
 605                const char *dots;
 606                if (abbrev)
 607                        hex = find_unique_abbrev(p->object.sha1, abbrev);
 608                if (!hex)
 609                        hex = sha1_to_hex(p->object.sha1);
 610                dots = (abbrev && strlen(hex) != 40) ?  "..." : "";
 611                parent = parent->next;
 612
 613                strbuf_addf(sb, " %s%s", hex, dots);
 614        }
 615        strbuf_addch(sb, '\n');
 616}
 617
 618static char *get_header(const struct commit *commit, const char *key)
 619{
 620        int key_len = strlen(key);
 621        const char *line = commit->buffer;
 622
 623        for (;;) {
 624                const char *eol = strchr(line, '\n'), *next;
 625
 626                if (line == eol)
 627                        return NULL;
 628                if (!eol) {
 629                        eol = line + strlen(line);
 630                        next = NULL;
 631                } else
 632                        next = eol + 1;
 633                if (eol - line > key_len &&
 634                    !strncmp(line, key, key_len) &&
 635                    line[key_len] == ' ') {
 636                        return xmemdupz(line + key_len + 1, eol - line - key_len - 1);
 637                }
 638                line = next;
 639        }
 640}
 641
 642static char *replace_encoding_header(char *buf, const char *encoding)
 643{
 644        struct strbuf tmp;
 645        size_t start, len;
 646        char *cp = buf;
 647
 648        /* guess if there is an encoding header before a \n\n */
 649        while (strncmp(cp, "encoding ", strlen("encoding "))) {
 650                cp = strchr(cp, '\n');
 651                if (!cp || *++cp == '\n')
 652                        return buf;
 653        }
 654        start = cp - buf;
 655        cp = strchr(cp, '\n');
 656        if (!cp)
 657                return buf; /* should not happen but be defensive */
 658        len = cp + 1 - (buf + start);
 659
 660        strbuf_init(&tmp, 0);
 661        strbuf_attach(&tmp, buf, strlen(buf), strlen(buf) + 1);
 662        if (is_encoding_utf8(encoding)) {
 663                /* we have re-coded to UTF-8; drop the header */
 664                strbuf_remove(&tmp, start, len);
 665        } else {
 666                /* just replaces XXXX in 'encoding XXXX\n' */
 667                strbuf_splice(&tmp, start + strlen("encoding "),
 668                                          len - strlen("encoding \n"),
 669                                          encoding, strlen(encoding));
 670        }
 671        return strbuf_detach(&tmp, NULL);
 672}
 673
 674static char *logmsg_reencode(const struct commit *commit,
 675                             const char *output_encoding)
 676{
 677        static const char *utf8 = "utf-8";
 678        const char *use_encoding;
 679        char *encoding;
 680        char *out;
 681
 682        if (!*output_encoding)
 683                return NULL;
 684        encoding = get_header(commit, "encoding");
 685        use_encoding = encoding ? encoding : utf8;
 686        if (!strcmp(use_encoding, output_encoding))
 687                if (encoding) /* we'll strip encoding header later */
 688                        out = xstrdup(commit->buffer);
 689                else
 690                        return NULL; /* nothing to do */
 691        else
 692                out = reencode_string(commit->buffer,
 693                                      output_encoding, use_encoding);
 694        if (out)
 695                out = replace_encoding_header(out, output_encoding);
 696
 697        free(encoding);
 698        return out;
 699}
 700
 701static void fill_person(struct interp *table, const char *msg, int len)
 702{
 703        int start, end, tz = 0;
 704        unsigned long date;
 705        char *ep;
 706
 707        /* parse name */
 708        for (end = 0; end < len && msg[end] != '<'; end++)
 709                ; /* do nothing */
 710        start = end + 1;
 711        while (end > 0 && isspace(msg[end - 1]))
 712                end--;
 713        table[0].value = xmemdupz(msg, end);
 714
 715        if (start >= len)
 716                return;
 717
 718        /* parse email */
 719        for (end = start + 1; end < len && msg[end] != '>'; end++)
 720                ; /* do nothing */
 721
 722        if (end >= len)
 723                return;
 724
 725        table[1].value = xmemdupz(msg + start, end - start);
 726
 727        /* parse date */
 728        for (start = end + 1; start < len && isspace(msg[start]); start++)
 729                ; /* do nothing */
 730        if (start >= len)
 731                return;
 732        date = strtoul(msg + start, &ep, 10);
 733        if (msg + start == ep)
 734                return;
 735
 736        table[5].value = xmemdupz(msg + start, ep - (msg + start));
 737
 738        /* parse tz */
 739        for (start = ep - msg + 1; start < len && isspace(msg[start]); start++)
 740                ; /* do nothing */
 741        if (start + 1 < len) {
 742                tz = strtoul(msg + start + 1, NULL, 10);
 743                if (msg[start] == '-')
 744                        tz = -tz;
 745        }
 746
 747        interp_set_entry(table, 2, show_date(date, tz, DATE_NORMAL));
 748        interp_set_entry(table, 3, show_date(date, tz, DATE_RFC2822));
 749        interp_set_entry(table, 4, show_date(date, tz, DATE_RELATIVE));
 750        interp_set_entry(table, 6, show_date(date, tz, DATE_ISO8601));
 751}
 752
 753void format_commit_message(const struct commit *commit,
 754                           const void *format, struct strbuf *sb)
 755{
 756        struct interp table[] = {
 757                { "%H" },       /* commit hash */
 758                { "%h" },       /* abbreviated commit hash */
 759                { "%T" },       /* tree hash */
 760                { "%t" },       /* abbreviated tree hash */
 761                { "%P" },       /* parent hashes */
 762                { "%p" },       /* abbreviated parent hashes */
 763                { "%an" },      /* author name */
 764                { "%ae" },      /* author email */
 765                { "%ad" },      /* author date */
 766                { "%aD" },      /* author date, RFC2822 style */
 767                { "%ar" },      /* author date, relative */
 768                { "%at" },      /* author date, UNIX timestamp */
 769                { "%ai" },      /* author date, ISO 8601 */
 770                { "%cn" },      /* committer name */
 771                { "%ce" },      /* committer email */
 772                { "%cd" },      /* committer date */
 773                { "%cD" },      /* committer date, RFC2822 style */
 774                { "%cr" },      /* committer date, relative */
 775                { "%ct" },      /* committer date, UNIX timestamp */
 776                { "%ci" },      /* committer date, ISO 8601 */
 777                { "%e" },       /* encoding */
 778                { "%s" },       /* subject */
 779                { "%b" },       /* body */
 780                { "%Cred" },    /* red */
 781                { "%Cgreen" },  /* green */
 782                { "%Cblue" },   /* blue */
 783                { "%Creset" },  /* reset color */
 784                { "%n" },       /* newline */
 785                { "%m" },       /* left/right/bottom */
 786        };
 787        enum interp_index {
 788                IHASH = 0, IHASH_ABBREV,
 789                ITREE, ITREE_ABBREV,
 790                IPARENTS, IPARENTS_ABBREV,
 791                IAUTHOR_NAME, IAUTHOR_EMAIL,
 792                IAUTHOR_DATE, IAUTHOR_DATE_RFC2822, IAUTHOR_DATE_RELATIVE,
 793                IAUTHOR_TIMESTAMP, IAUTHOR_ISO8601,
 794                ICOMMITTER_NAME, ICOMMITTER_EMAIL,
 795                ICOMMITTER_DATE, ICOMMITTER_DATE_RFC2822,
 796                ICOMMITTER_DATE_RELATIVE, ICOMMITTER_TIMESTAMP,
 797                ICOMMITTER_ISO8601,
 798                IENCODING,
 799                ISUBJECT,
 800                IBODY,
 801                IRED, IGREEN, IBLUE, IRESET_COLOR,
 802                INEWLINE,
 803                ILEFT_RIGHT,
 804        };
 805        struct commit_list *p;
 806        char parents[1024];
 807        unsigned long len;
 808        int i;
 809        enum { HEADER, SUBJECT, BODY } state;
 810        const char *msg = commit->buffer;
 811
 812        if (ILEFT_RIGHT + 1 != ARRAY_SIZE(table))
 813                die("invalid interp table!");
 814
 815        /* these are independent of the commit */
 816        interp_set_entry(table, IRED, "\033[31m");
 817        interp_set_entry(table, IGREEN, "\033[32m");
 818        interp_set_entry(table, IBLUE, "\033[34m");
 819        interp_set_entry(table, IRESET_COLOR, "\033[m");
 820        interp_set_entry(table, INEWLINE, "\n");
 821
 822        /* these depend on the commit */
 823        if (!commit->object.parsed)
 824                parse_object(commit->object.sha1);
 825        interp_set_entry(table, IHASH, sha1_to_hex(commit->object.sha1));
 826        interp_set_entry(table, IHASH_ABBREV,
 827                        find_unique_abbrev(commit->object.sha1,
 828                                DEFAULT_ABBREV));
 829        interp_set_entry(table, ITREE, sha1_to_hex(commit->tree->object.sha1));
 830        interp_set_entry(table, ITREE_ABBREV,
 831                        find_unique_abbrev(commit->tree->object.sha1,
 832                                DEFAULT_ABBREV));
 833        interp_set_entry(table, ILEFT_RIGHT,
 834                         (commit->object.flags & BOUNDARY)
 835                         ? "-"
 836                         : (commit->object.flags & SYMMETRIC_LEFT)
 837                         ? "<"
 838                         : ">");
 839
 840        parents[1] = 0;
 841        for (i = 0, p = commit->parents;
 842                        p && i < sizeof(parents) - 1;
 843                        p = p->next)
 844                i += snprintf(parents + i, sizeof(parents) - i - 1, " %s",
 845                        sha1_to_hex(p->item->object.sha1));
 846        interp_set_entry(table, IPARENTS, parents + 1);
 847
 848        parents[1] = 0;
 849        for (i = 0, p = commit->parents;
 850                        p && i < sizeof(parents) - 1;
 851                        p = p->next)
 852                i += snprintf(parents + i, sizeof(parents) - i - 1, " %s",
 853                        find_unique_abbrev(p->item->object.sha1,
 854                                DEFAULT_ABBREV));
 855        interp_set_entry(table, IPARENTS_ABBREV, parents + 1);
 856
 857        for (i = 0, state = HEADER; msg[i] && state < BODY; i++) {
 858                int eol;
 859                for (eol = i; msg[eol] && msg[eol] != '\n'; eol++)
 860                        ; /* do nothing */
 861
 862                if (state == SUBJECT) {
 863                        table[ISUBJECT].value = xmemdupz(msg + i, eol - i);
 864                        i = eol;
 865                }
 866                if (i == eol) {
 867                        state++;
 868                        /* strip empty lines */
 869                        while (msg[eol + 1] == '\n')
 870                                eol++;
 871                } else if (!prefixcmp(msg + i, "author "))
 872                        fill_person(table + IAUTHOR_NAME,
 873                                        msg + i + 7, eol - i - 7);
 874                else if (!prefixcmp(msg + i, "committer "))
 875                        fill_person(table + ICOMMITTER_NAME,
 876                                        msg + i + 10, eol - i - 10);
 877                else if (!prefixcmp(msg + i, "encoding "))
 878                        table[IENCODING].value =
 879                                xmemdupz(msg + i + 9, eol - i - 9);
 880                i = eol;
 881        }
 882        if (msg[i])
 883                table[IBODY].value = xstrdup(msg + i);
 884
 885        len = interpolate(sb->buf + sb->len, strbuf_avail(sb),
 886                                format, table, ARRAY_SIZE(table));
 887        if (len > strbuf_avail(sb)) {
 888                strbuf_grow(sb, len);
 889                interpolate(sb->buf + sb->len, strbuf_avail(sb) + 1,
 890                                        format, table, ARRAY_SIZE(table));
 891        }
 892        strbuf_setlen(sb, sb->len + len);
 893        interp_clear_table(table, ARRAY_SIZE(table));
 894}
 895
 896static void pp_header(enum cmit_fmt fmt,
 897                      int abbrev,
 898                      enum date_mode dmode,
 899                      const char *encoding,
 900                      const struct commit *commit,
 901                      const char **msg_p,
 902                      struct strbuf *sb)
 903{
 904        int parents_shown = 0;
 905
 906        for (;;) {
 907                const char *line = *msg_p;
 908                int linelen = get_one_line(*msg_p);
 909
 910                if (!linelen)
 911                        return;
 912                *msg_p += linelen;
 913
 914                if (linelen == 1)
 915                        /* End of header */
 916                        return;
 917
 918                if (fmt == CMIT_FMT_RAW) {
 919                        strbuf_add(sb, line, linelen);
 920                        continue;
 921                }
 922
 923                if (!memcmp(line, "parent ", 7)) {
 924                        if (linelen != 48)
 925                                die("bad parent line in commit");
 926                        continue;
 927                }
 928
 929                if (!parents_shown) {
 930                        struct commit_list *parent;
 931                        int num;
 932                        for (parent = commit->parents, num = 0;
 933                             parent;
 934                             parent = parent->next, num++)
 935                                ;
 936                        /* with enough slop */
 937                        strbuf_grow(sb, num * 50 + 20);
 938                        add_merge_info(fmt, sb, commit, abbrev);
 939                        parents_shown = 1;
 940                }
 941
 942                /*
 943                 * MEDIUM == DEFAULT shows only author with dates.
 944                 * FULL shows both authors but not dates.
 945                 * FULLER shows both authors and dates.
 946                 */
 947                if (!memcmp(line, "author ", 7)) {
 948                        strbuf_grow(sb, linelen + 80);
 949                        add_user_info("Author", fmt, sb, line + 7, dmode, encoding);
 950                }
 951                if (!memcmp(line, "committer ", 10) &&
 952                    (fmt == CMIT_FMT_FULL || fmt == CMIT_FMT_FULLER)) {
 953                        strbuf_grow(sb, linelen + 80);
 954                        add_user_info("Commit", fmt, sb, line + 10, dmode, encoding);
 955                }
 956        }
 957}
 958
 959static void pp_title_line(enum cmit_fmt fmt,
 960                          const char **msg_p,
 961                          struct strbuf *sb,
 962                          const char *subject,
 963                          const char *after_subject,
 964                          const char *encoding,
 965                          int plain_non_ascii)
 966{
 967        struct strbuf title;
 968
 969        strbuf_init(&title, 80);
 970
 971        for (;;) {
 972                const char *line = *msg_p;
 973                int linelen = get_one_line(line);
 974
 975                *msg_p += linelen;
 976                if (!linelen || is_empty_line(line, &linelen))
 977                        break;
 978
 979                strbuf_grow(&title, linelen + 2);
 980                if (title.len) {
 981                        if (fmt == CMIT_FMT_EMAIL) {
 982                                strbuf_addch(&title, '\n');
 983                        }
 984                        strbuf_addch(&title, ' ');
 985                }
 986                strbuf_add(&title, line, linelen);
 987        }
 988
 989        strbuf_grow(sb, title.len + 1024);
 990        if (subject) {
 991                strbuf_addstr(sb, subject);
 992                add_rfc2047(sb, title.buf, title.len, encoding);
 993        } else {
 994                strbuf_addbuf(sb, &title);
 995        }
 996        strbuf_addch(sb, '\n');
 997
 998        if (plain_non_ascii) {
 999                const char *header_fmt =
1000                        "MIME-Version: 1.0\n"
1001                        "Content-Type: text/plain; charset=%s\n"
1002                        "Content-Transfer-Encoding: 8bit\n";
1003                strbuf_addf(sb, header_fmt, encoding);
1004        }
1005        if (after_subject) {
1006                strbuf_addstr(sb, after_subject);
1007        }
1008        if (fmt == CMIT_FMT_EMAIL) {
1009                strbuf_addch(sb, '\n');
1010        }
1011        strbuf_release(&title);
1012}
1013
1014static void pp_remainder(enum cmit_fmt fmt,
1015                         const char **msg_p,
1016                         struct strbuf *sb,
1017                         int indent)
1018{
1019        int first = 1;
1020        for (;;) {
1021                const char *line = *msg_p;
1022                int linelen = get_one_line(line);
1023                *msg_p += linelen;
1024
1025                if (!linelen)
1026                        break;
1027
1028                if (is_empty_line(line, &linelen)) {
1029                        if (first)
1030                                continue;
1031                        if (fmt == CMIT_FMT_SHORT)
1032                                break;
1033                }
1034                first = 0;
1035
1036                strbuf_grow(sb, linelen + indent + 20);
1037                if (indent) {
1038                        memset(sb->buf + sb->len, ' ', indent);
1039                        strbuf_setlen(sb, sb->len + indent);
1040                }
1041                strbuf_add(sb, line, linelen);
1042                strbuf_addch(sb, '\n');
1043        }
1044}
1045
1046void pretty_print_commit(enum cmit_fmt fmt, const struct commit *commit,
1047                                  struct strbuf *sb, int abbrev,
1048                                  const char *subject, const char *after_subject,
1049                                  enum date_mode dmode)
1050{
1051        unsigned long beginning_of_body;
1052        int indent = 4;
1053        const char *msg = commit->buffer;
1054        int plain_non_ascii = 0;
1055        char *reencoded;
1056        const char *encoding;
1057
1058        if (fmt == CMIT_FMT_USERFORMAT) {
1059                format_commit_message(commit, user_format, sb);
1060                return;
1061        }
1062
1063        encoding = (git_log_output_encoding
1064                    ? git_log_output_encoding
1065                    : git_commit_encoding);
1066        if (!encoding)
1067                encoding = "utf-8";
1068        reencoded = logmsg_reencode(commit, encoding);
1069        if (reencoded) {
1070                msg = reencoded;
1071        }
1072
1073        if (fmt == CMIT_FMT_ONELINE || fmt == CMIT_FMT_EMAIL)
1074                indent = 0;
1075
1076        /* After-subject is used to pass in Content-Type: multipart
1077         * MIME header; in that case we do not have to do the
1078         * plaintext content type even if the commit message has
1079         * non 7-bit ASCII character.  Otherwise, check if we need
1080         * to say this is not a 7-bit ASCII.
1081         */
1082        if (fmt == CMIT_FMT_EMAIL && !after_subject) {
1083                int i, ch, in_body;
1084
1085                for (in_body = i = 0; (ch = msg[i]); i++) {
1086                        if (!in_body) {
1087                                /* author could be non 7-bit ASCII but
1088                                 * the log may be so; skip over the
1089                                 * header part first.
1090                                 */
1091                                if (ch == '\n' && msg[i+1] == '\n')
1092                                        in_body = 1;
1093                        }
1094                        else if (non_ascii(ch)) {
1095                                plain_non_ascii = 1;
1096                                break;
1097                        }
1098                }
1099        }
1100
1101        pp_header(fmt, abbrev, dmode, encoding, commit, &msg, sb);
1102        if (fmt != CMIT_FMT_ONELINE && !subject) {
1103                strbuf_addch(sb, '\n');
1104        }
1105
1106        /* Skip excess blank lines at the beginning of body, if any... */
1107        for (;;) {
1108                int linelen = get_one_line(msg);
1109                int ll = linelen;
1110                if (!linelen)
1111                        break;
1112                if (!is_empty_line(msg, &ll))
1113                        break;
1114                msg += linelen;
1115        }
1116
1117        /* These formats treat the title line specially. */
1118        if (fmt == CMIT_FMT_ONELINE || fmt == CMIT_FMT_EMAIL)
1119                pp_title_line(fmt, &msg, sb, subject,
1120                              after_subject, encoding, plain_non_ascii);
1121
1122        beginning_of_body = sb->len;
1123        if (fmt != CMIT_FMT_ONELINE)
1124                pp_remainder(fmt, &msg, sb, indent);
1125        strbuf_rtrim(sb);
1126
1127        /* Make sure there is an EOLN for the non-oneline case */
1128        if (fmt != CMIT_FMT_ONELINE)
1129                strbuf_addch(sb, '\n');
1130
1131        /*
1132         * The caller may append additional body text in e-mail
1133         * format.  Make sure we did not strip the blank line
1134         * between the header and the body.
1135         */
1136        if (fmt == CMIT_FMT_EMAIL && sb->len <= beginning_of_body)
1137                strbuf_addch(sb, '\n');
1138        free(reencoded);
1139}
1140
1141struct commit *pop_commit(struct commit_list **stack)
1142{
1143        struct commit_list *top = *stack;
1144        struct commit *item = top ? top->item : NULL;
1145
1146        if (top) {
1147                *stack = top->next;
1148                free(top);
1149        }
1150        return item;
1151}
1152
1153void topo_sort_default_setter(struct commit *c, void *data)
1154{
1155        c->util = data;
1156}
1157
1158void *topo_sort_default_getter(struct commit *c)
1159{
1160        return c->util;
1161}
1162
1163/*
1164 * Performs an in-place topological sort on the list supplied.
1165 */
1166void sort_in_topological_order(struct commit_list ** list, int lifo)
1167{
1168        sort_in_topological_order_fn(list, lifo, topo_sort_default_setter,
1169                                     topo_sort_default_getter);
1170}
1171
1172void sort_in_topological_order_fn(struct commit_list ** list, int lifo,
1173                                  topo_sort_set_fn_t setter,
1174                                  topo_sort_get_fn_t getter)
1175{
1176        struct commit_list * next = *list;
1177        struct commit_list * work = NULL, **insert;
1178        struct commit_list ** pptr = list;
1179        struct sort_node * nodes;
1180        struct sort_node * next_nodes;
1181        int count = 0;
1182
1183        /* determine the size of the list */
1184        while (next) {
1185                next = next->next;
1186                count++;
1187        }
1188
1189        if (!count)
1190                return;
1191        /* allocate an array to help sort the list */
1192        nodes = xcalloc(count, sizeof(*nodes));
1193        /* link the list to the array */
1194        next_nodes = nodes;
1195        next=*list;
1196        while (next) {
1197                next_nodes->list_item = next;
1198                setter(next->item, next_nodes);
1199                next_nodes++;
1200                next = next->next;
1201        }
1202        /* update the indegree */
1203        next=*list;
1204        while (next) {
1205                struct commit_list * parents = next->item->parents;
1206                while (parents) {
1207                        struct commit * parent=parents->item;
1208                        struct sort_node * pn = (struct sort_node *) getter(parent);
1209
1210                        if (pn)
1211                                pn->indegree++;
1212                        parents=parents->next;
1213                }
1214                next=next->next;
1215        }
1216        /*
1217         * find the tips
1218         *
1219         * tips are nodes not reachable from any other node in the list
1220         *
1221         * the tips serve as a starting set for the work queue.
1222         */
1223        next=*list;
1224        insert = &work;
1225        while (next) {
1226                struct sort_node * node = (struct sort_node *) getter(next->item);
1227
1228                if (node->indegree == 0) {
1229                        insert = &commit_list_insert(next->item, insert)->next;
1230                }
1231                next=next->next;
1232        }
1233
1234        /* process the list in topological order */
1235        if (!lifo)
1236                sort_by_date(&work);
1237        while (work) {
1238                struct commit * work_item = pop_commit(&work);
1239                struct sort_node * work_node = (struct sort_node *) getter(work_item);
1240                struct commit_list * parents = work_item->parents;
1241
1242                while (parents) {
1243                        struct commit * parent=parents->item;
1244                        struct sort_node * pn = (struct sort_node *) getter(parent);
1245
1246                        if (pn) {
1247                                /*
1248                                 * parents are only enqueued for emission
1249                                 * when all their children have been emitted thereby
1250                                 * guaranteeing topological order.
1251                                 */
1252                                pn->indegree--;
1253                                if (!pn->indegree) {
1254                                        if (!lifo)
1255                                                insert_by_date(parent, &work);
1256                                        else
1257                                                commit_list_insert(parent, &work);
1258                                }
1259                        }
1260                        parents=parents->next;
1261                }
1262                /*
1263                 * work_item is a commit all of whose children
1264                 * have already been emitted. we can emit it now.
1265                 */
1266                *pptr = work_node->list_item;
1267                pptr = &(*pptr)->next;
1268                *pptr = NULL;
1269                setter(work_item, NULL);
1270        }
1271        free(nodes);
1272}
1273
1274/* merge-base stuff */
1275
1276/* bits #0..15 in revision.h */
1277#define PARENT1         (1u<<16)
1278#define PARENT2         (1u<<17)
1279#define STALE           (1u<<18)
1280#define RESULT          (1u<<19)
1281
1282static const unsigned all_flags = (PARENT1 | PARENT2 | STALE | RESULT);
1283
1284static struct commit *interesting(struct commit_list *list)
1285{
1286        while (list) {
1287                struct commit *commit = list->item;
1288                list = list->next;
1289                if (commit->object.flags & STALE)
1290                        continue;
1291                return commit;
1292        }
1293        return NULL;
1294}
1295
1296static struct commit_list *merge_bases(struct commit *one, struct commit *two)
1297{
1298        struct commit_list *list = NULL;
1299        struct commit_list *result = NULL;
1300
1301        if (one == two)
1302                /* We do not mark this even with RESULT so we do not
1303                 * have to clean it up.
1304                 */
1305                return commit_list_insert(one, &result);
1306
1307        parse_commit(one);
1308        parse_commit(two);
1309
1310        one->object.flags |= PARENT1;
1311        two->object.flags |= PARENT2;
1312        insert_by_date(one, &list);
1313        insert_by_date(two, &list);
1314
1315        while (interesting(list)) {
1316                struct commit *commit;
1317                struct commit_list *parents;
1318                struct commit_list *n;
1319                int flags;
1320
1321                commit = list->item;
1322                n = list->next;
1323                free(list);
1324                list = n;
1325
1326                flags = commit->object.flags & (PARENT1 | PARENT2 | STALE);
1327                if (flags == (PARENT1 | PARENT2)) {
1328                        if (!(commit->object.flags & RESULT)) {
1329                                commit->object.flags |= RESULT;
1330                                insert_by_date(commit, &result);
1331                        }
1332                        /* Mark parents of a found merge stale */
1333                        flags |= STALE;
1334                }
1335                parents = commit->parents;
1336                while (parents) {
1337                        struct commit *p = parents->item;
1338                        parents = parents->next;
1339                        if ((p->object.flags & flags) == flags)
1340                                continue;
1341                        parse_commit(p);
1342                        p->object.flags |= flags;
1343                        insert_by_date(p, &list);
1344                }
1345        }
1346
1347        /* Clean up the result to remove stale ones */
1348        free_commit_list(list);
1349        list = result; result = NULL;
1350        while (list) {
1351                struct commit_list *n = list->next;
1352                if (!(list->item->object.flags & STALE))
1353                        insert_by_date(list->item, &result);
1354                free(list);
1355                list = n;
1356        }
1357        return result;
1358}
1359
1360struct commit_list *get_merge_bases(struct commit *one,
1361                                        struct commit *two, int cleanup)
1362{
1363        struct commit_list *list;
1364        struct commit **rslt;
1365        struct commit_list *result;
1366        int cnt, i, j;
1367
1368        result = merge_bases(one, two);
1369        if (one == two)
1370                return result;
1371        if (!result || !result->next) {
1372                if (cleanup) {
1373                        clear_commit_marks(one, all_flags);
1374                        clear_commit_marks(two, all_flags);
1375                }
1376                return result;
1377        }
1378
1379        /* There are more than one */
1380        cnt = 0;
1381        list = result;
1382        while (list) {
1383                list = list->next;
1384                cnt++;
1385        }
1386        rslt = xcalloc(cnt, sizeof(*rslt));
1387        for (list = result, i = 0; list; list = list->next)
1388                rslt[i++] = list->item;
1389        free_commit_list(result);
1390
1391        clear_commit_marks(one, all_flags);
1392        clear_commit_marks(two, all_flags);
1393        for (i = 0; i < cnt - 1; i++) {
1394                for (j = i+1; j < cnt; j++) {
1395                        if (!rslt[i] || !rslt[j])
1396                                continue;
1397                        result = merge_bases(rslt[i], rslt[j]);
1398                        clear_commit_marks(rslt[i], all_flags);
1399                        clear_commit_marks(rslt[j], all_flags);
1400                        for (list = result; list; list = list->next) {
1401                                if (rslt[i] == list->item)
1402                                        rslt[i] = NULL;
1403                                if (rslt[j] == list->item)
1404                                        rslt[j] = NULL;
1405                        }
1406                }
1407        }
1408
1409        /* Surviving ones in rslt[] are the independent results */
1410        result = NULL;
1411        for (i = 0; i < cnt; i++) {
1412                if (rslt[i])
1413                        insert_by_date(rslt[i], &result);
1414        }
1415        free(rslt);
1416        return result;
1417}
1418
1419int in_merge_bases(struct commit *commit, struct commit **reference, int num)
1420{
1421        struct commit_list *bases, *b;
1422        int ret = 0;
1423
1424        if (num == 1)
1425                bases = get_merge_bases(commit, *reference, 1);
1426        else
1427                die("not yet");
1428        for (b = bases; b; b = b->next) {
1429                if (!hashcmp(commit->object.sha1, b->item->object.sha1)) {
1430                        ret = 1;
1431                        break;
1432                }
1433        }
1434
1435        free_commit_list(bases);
1436        return ret;
1437}