Andrew's git / gitweb.git / commit.c
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commit.con commit git-svn: dcommit prints out the URL to be committed to (15d5475)
   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        struct commit_list *parents;
 445
 446        commit->object.flags &= ~mark;
 447        parents = commit->parents;
 448        while (parents) {
 449                struct commit *parent = parents->item;
 450
 451                /* Have we already cleared this? */
 452                if (mark & parent->object.flags)
 453                        clear_commit_marks(parent, mark);
 454                parents = parents->next;
 455        }
 456}
 457
 458/*
 459 * Generic support for pretty-printing the header
 460 */
 461static int get_one_line(const char *msg, unsigned long len)
 462{
 463        int ret = 0;
 464
 465        while (len--) {
 466                char c = *msg++;
 467                if (!c)
 468                        break;
 469                ret++;
 470                if (c == '\n')
 471                        break;
 472        }
 473        return ret;
 474}
 475
 476/* High bit set, or ISO-2022-INT */
 477static int non_ascii(int ch)
 478{
 479        ch = (ch & 0xff);
 480        return ((ch & 0x80) || (ch == 0x1b));
 481}
 482
 483static int is_rfc2047_special(char ch)
 484{
 485        return (non_ascii(ch) || (ch == '=') || (ch == '?') || (ch == '_'));
 486}
 487
 488static int add_rfc2047(char *buf, const char *line, int len,
 489                       const char *encoding)
 490{
 491        char *bp = buf;
 492        int i, needquote;
 493        char q_encoding[128];
 494        const char *q_encoding_fmt = "=?%s?q?";
 495
 496        for (i = needquote = 0; !needquote && i < len; i++) {
 497                int ch = line[i];
 498                if (non_ascii(ch))
 499                        needquote++;
 500                if ((i + 1 < len) &&
 501                    (ch == '=' && line[i+1] == '?'))
 502                        needquote++;
 503        }
 504        if (!needquote)
 505                return sprintf(buf, "%.*s", len, line);
 506
 507        i = snprintf(q_encoding, sizeof(q_encoding), q_encoding_fmt, encoding);
 508        if (sizeof(q_encoding) < i)
 509                die("Insanely long encoding name %s", encoding);
 510        memcpy(bp, q_encoding, i);
 511        bp += i;
 512        for (i = 0; i < len; i++) {
 513                unsigned ch = line[i] & 0xFF;
 514                /*
 515                 * We encode ' ' using '=20' even though rfc2047
 516                 * allows using '_' for readability.  Unfortunately,
 517                 * many programs do not understand this and just
 518                 * leave the underscore in place.
 519                 */
 520                if (is_rfc2047_special(ch) || ch == ' ') {
 521                        sprintf(bp, "=%02X", ch);
 522                        bp += 3;
 523                }
 524                else
 525                        *bp++ = ch;
 526        }
 527        memcpy(bp, "?=", 2);
 528        bp += 2;
 529        return bp - buf;
 530}
 531
 532static unsigned long bound_rfc2047(unsigned long len, const char *encoding)
 533{
 534        /* upper bound of q encoded string of length 'len' */
 535        unsigned long elen = strlen(encoding);
 536
 537        return len * 3 + elen + 100;
 538}
 539
 540static int add_user_info(const char *what, enum cmit_fmt fmt, char *buf,
 541                         const char *line, enum date_mode dmode,
 542                         const char *encoding)
 543{
 544        char *date;
 545        int namelen;
 546        unsigned long time;
 547        int tz, ret;
 548        const char *filler = "    ";
 549
 550        if (fmt == CMIT_FMT_ONELINE)
 551                return 0;
 552        date = strchr(line, '>');
 553        if (!date)
 554                return 0;
 555        namelen = ++date - line;
 556        time = strtoul(date, &date, 10);
 557        tz = strtol(date, NULL, 10);
 558
 559        if (fmt == CMIT_FMT_EMAIL) {
 560                char *name_tail = strchr(line, '<');
 561                int display_name_length;
 562                if (!name_tail)
 563                        return 0;
 564                while (line < name_tail && isspace(name_tail[-1]))
 565                        name_tail--;
 566                display_name_length = name_tail - line;
 567                filler = "";
 568                strcpy(buf, "From: ");
 569                ret = strlen(buf);
 570                ret += add_rfc2047(buf + ret, line, display_name_length,
 571                                   encoding);
 572                memcpy(buf + ret, name_tail, namelen - display_name_length);
 573                ret += namelen - display_name_length;
 574                buf[ret++] = '\n';
 575        }
 576        else {
 577                ret = sprintf(buf, "%s: %.*s%.*s\n", what,
 578                              (fmt == CMIT_FMT_FULLER) ? 4 : 0,
 579                              filler, namelen, line);
 580        }
 581        switch (fmt) {
 582        case CMIT_FMT_MEDIUM:
 583                ret += sprintf(buf + ret, "Date:   %s\n",
 584                               show_date(time, tz, dmode));
 585                break;
 586        case CMIT_FMT_EMAIL:
 587                ret += sprintf(buf + ret, "Date: %s\n",
 588                               show_date(time, tz, DATE_RFC2822));
 589                break;
 590        case CMIT_FMT_FULLER:
 591                ret += sprintf(buf + ret, "%sDate: %s\n", what,
 592                               show_date(time, tz, dmode));
 593                break;
 594        default:
 595                /* notin' */
 596                break;
 597        }
 598        return ret;
 599}
 600
 601static int is_empty_line(const char *line, int *len_p)
 602{
 603        int len = *len_p;
 604        while (len && isspace(line[len-1]))
 605                len--;
 606        *len_p = len;
 607        return !len;
 608}
 609
 610static int add_merge_info(enum cmit_fmt fmt, char *buf, const struct commit *commit, int abbrev)
 611{
 612        struct commit_list *parent = commit->parents;
 613        int offset;
 614
 615        if ((fmt == CMIT_FMT_ONELINE) || (fmt == CMIT_FMT_EMAIL) ||
 616            !parent || !parent->next)
 617                return 0;
 618
 619        offset = sprintf(buf, "Merge:");
 620
 621        while (parent) {
 622                struct commit *p = parent->item;
 623                const char *hex = NULL;
 624                const char *dots;
 625                if (abbrev)
 626                        hex = find_unique_abbrev(p->object.sha1, abbrev);
 627                if (!hex)
 628                        hex = sha1_to_hex(p->object.sha1);
 629                dots = (abbrev && strlen(hex) != 40) ?  "..." : "";
 630                parent = parent->next;
 631
 632                offset += sprintf(buf + offset, " %s%s", hex, dots);
 633        }
 634        buf[offset++] = '\n';
 635        return offset;
 636}
 637
 638static char *get_header(const struct commit *commit, const char *key)
 639{
 640        int key_len = strlen(key);
 641        const char *line = commit->buffer;
 642
 643        for (;;) {
 644                const char *eol = strchr(line, '\n'), *next;
 645
 646                if (line == eol)
 647                        return NULL;
 648                if (!eol) {
 649                        eol = line + strlen(line);
 650                        next = NULL;
 651                } else
 652                        next = eol + 1;
 653                if (eol - line > key_len &&
 654                    !strncmp(line, key, key_len) &&
 655                    line[key_len] == ' ') {
 656                        int len = eol - line - key_len;
 657                        char *ret = xmalloc(len);
 658                        memcpy(ret, line + key_len + 1, len - 1);
 659                        ret[len - 1] = '\0';
 660                        return ret;
 661                }
 662                line = next;
 663        }
 664}
 665
 666static char *replace_encoding_header(char *buf, const char *encoding)
 667{
 668        char *encoding_header = strstr(buf, "\nencoding ");
 669        char *header_end = strstr(buf, "\n\n");
 670        char *end_of_encoding_header;
 671        int encoding_header_pos;
 672        int encoding_header_len;
 673        int new_len;
 674        int need_len;
 675        int buflen = strlen(buf) + 1;
 676
 677        if (!header_end)
 678                header_end = buf + buflen;
 679        if (!encoding_header || encoding_header >= header_end)
 680                return buf;
 681        encoding_header++;
 682        end_of_encoding_header = strchr(encoding_header, '\n');
 683        if (!end_of_encoding_header)
 684                return buf; /* should not happen but be defensive */
 685        end_of_encoding_header++;
 686
 687        encoding_header_len = end_of_encoding_header - encoding_header;
 688        encoding_header_pos = encoding_header - buf;
 689
 690        if (is_encoding_utf8(encoding)) {
 691                /* we have re-coded to UTF-8; drop the header */
 692                memmove(encoding_header, end_of_encoding_header,
 693                        buflen - (encoding_header_pos + encoding_header_len));
 694                return buf;
 695        }
 696        new_len = strlen(encoding);
 697        need_len = new_len + strlen("encoding \n");
 698        if (encoding_header_len < need_len) {
 699                buf = xrealloc(buf, buflen + (need_len - encoding_header_len));
 700                encoding_header = buf + encoding_header_pos;
 701                end_of_encoding_header = encoding_header + encoding_header_len;
 702        }
 703        memmove(end_of_encoding_header + (need_len - encoding_header_len),
 704                end_of_encoding_header,
 705                buflen - (encoding_header_pos + encoding_header_len));
 706        memcpy(encoding_header + 9, encoding, strlen(encoding));
 707        encoding_header[9 + new_len] = '\n';
 708        return buf;
 709}
 710
 711static char *logmsg_reencode(const struct commit *commit,
 712                             const char *output_encoding)
 713{
 714        static const char *utf8 = "utf-8";
 715        const char *use_encoding;
 716        char *encoding;
 717        char *out;
 718
 719        if (!*output_encoding)
 720                return NULL;
 721        encoding = get_header(commit, "encoding");
 722        use_encoding = encoding ? encoding : utf8;
 723        if (!strcmp(use_encoding, output_encoding))
 724                if (encoding) /* we'll strip encoding header later */
 725                        out = xstrdup(commit->buffer);
 726                else
 727                        return NULL; /* nothing to do */
 728        else
 729                out = reencode_string(commit->buffer,
 730                                      output_encoding, use_encoding);
 731        if (out)
 732                out = replace_encoding_header(out, output_encoding);
 733
 734        free(encoding);
 735        return out;
 736}
 737
 738static void fill_person(struct interp *table, const char *msg, int len)
 739{
 740        int start, end, tz = 0;
 741        unsigned long date;
 742        char *ep;
 743
 744        /* parse name */
 745        for (end = 0; end < len && msg[end] != '<'; end++)
 746                ; /* do nothing */
 747        start = end + 1;
 748        while (end > 0 && isspace(msg[end - 1]))
 749                end--;
 750        table[0].value = xstrndup(msg, end);
 751
 752        if (start >= len)
 753                return;
 754
 755        /* parse email */
 756        for (end = start + 1; end < len && msg[end] != '>'; end++)
 757                ; /* do nothing */
 758
 759        if (end >= len)
 760                return;
 761
 762        table[1].value = xstrndup(msg + start, end - start);
 763
 764        /* parse date */
 765        for (start = end + 1; start < len && isspace(msg[start]); start++)
 766                ; /* do nothing */
 767        if (start >= len)
 768                return;
 769        date = strtoul(msg + start, &ep, 10);
 770        if (msg + start == ep)
 771                return;
 772
 773        table[5].value = xstrndup(msg + start, ep - (msg + start));
 774
 775        /* parse tz */
 776        for (start = ep - msg + 1; start < len && isspace(msg[start]); start++)
 777                ; /* do nothing */
 778        if (start + 1 < len) {
 779                tz = strtoul(msg + start + 1, NULL, 10);
 780                if (msg[start] == '-')
 781                        tz = -tz;
 782        }
 783
 784        interp_set_entry(table, 2, show_date(date, tz, DATE_NORMAL));
 785        interp_set_entry(table, 3, show_date(date, tz, DATE_RFC2822));
 786        interp_set_entry(table, 4, show_date(date, tz, DATE_RELATIVE));
 787        interp_set_entry(table, 6, show_date(date, tz, DATE_ISO8601));
 788}
 789
 790static long format_commit_message(const struct commit *commit,
 791                const char *msg, char **buf_p, unsigned long *space_p)
 792{
 793        struct interp table[] = {
 794                { "%H" },       /* commit hash */
 795                { "%h" },       /* abbreviated commit hash */
 796                { "%T" },       /* tree hash */
 797                { "%t" },       /* abbreviated tree hash */
 798                { "%P" },       /* parent hashes */
 799                { "%p" },       /* abbreviated parent hashes */
 800                { "%an" },      /* author name */
 801                { "%ae" },      /* author email */
 802                { "%ad" },      /* author date */
 803                { "%aD" },      /* author date, RFC2822 style */
 804                { "%ar" },      /* author date, relative */
 805                { "%at" },      /* author date, UNIX timestamp */
 806                { "%ai" },      /* author date, ISO 8601 */
 807                { "%cn" },      /* committer name */
 808                { "%ce" },      /* committer email */
 809                { "%cd" },      /* committer date */
 810                { "%cD" },      /* committer date, RFC2822 style */
 811                { "%cr" },      /* committer date, relative */
 812                { "%ct" },      /* committer date, UNIX timestamp */
 813                { "%ci" },      /* committer date, ISO 8601 */
 814                { "%e" },       /* encoding */
 815                { "%s" },       /* subject */
 816                { "%b" },       /* body */
 817                { "%Cred" },    /* red */
 818                { "%Cgreen" },  /* green */
 819                { "%Cblue" },   /* blue */
 820                { "%Creset" },  /* reset color */
 821                { "%n" },       /* newline */
 822                { "%m" },       /* left/right/bottom */
 823        };
 824        enum interp_index {
 825                IHASH = 0, IHASH_ABBREV,
 826                ITREE, ITREE_ABBREV,
 827                IPARENTS, IPARENTS_ABBREV,
 828                IAUTHOR_NAME, IAUTHOR_EMAIL,
 829                IAUTHOR_DATE, IAUTHOR_DATE_RFC2822, IAUTHOR_DATE_RELATIVE,
 830                IAUTHOR_TIMESTAMP, IAUTHOR_ISO8601,
 831                ICOMMITTER_NAME, ICOMMITTER_EMAIL,
 832                ICOMMITTER_DATE, ICOMMITTER_DATE_RFC2822,
 833                ICOMMITTER_DATE_RELATIVE, ICOMMITTER_TIMESTAMP,
 834                ICOMMITTER_ISO8601,
 835                IENCODING,
 836                ISUBJECT,
 837                IBODY,
 838                IRED, IGREEN, IBLUE, IRESET_COLOR,
 839                INEWLINE,
 840                ILEFT_RIGHT,
 841        };
 842        struct commit_list *p;
 843        char parents[1024];
 844        int i;
 845        enum { HEADER, SUBJECT, BODY } state;
 846
 847        if (ILEFT_RIGHT + 1 != ARRAY_SIZE(table))
 848                die("invalid interp table!");
 849
 850        /* these are independent of the commit */
 851        interp_set_entry(table, IRED, "\033[31m");
 852        interp_set_entry(table, IGREEN, "\033[32m");
 853        interp_set_entry(table, IBLUE, "\033[34m");
 854        interp_set_entry(table, IRESET_COLOR, "\033[m");
 855        interp_set_entry(table, INEWLINE, "\n");
 856
 857        /* these depend on the commit */
 858        if (!commit->object.parsed)
 859                parse_object(commit->object.sha1);
 860        interp_set_entry(table, IHASH, sha1_to_hex(commit->object.sha1));
 861        interp_set_entry(table, IHASH_ABBREV,
 862                        find_unique_abbrev(commit->object.sha1,
 863                                DEFAULT_ABBREV));
 864        interp_set_entry(table, ITREE, sha1_to_hex(commit->tree->object.sha1));
 865        interp_set_entry(table, ITREE_ABBREV,
 866                        find_unique_abbrev(commit->tree->object.sha1,
 867                                DEFAULT_ABBREV));
 868        interp_set_entry(table, ILEFT_RIGHT,
 869                         (commit->object.flags & BOUNDARY)
 870                         ? "-"
 871                         : (commit->object.flags & SYMMETRIC_LEFT)
 872                         ? "<"
 873                         : ">");
 874
 875        parents[1] = 0;
 876        for (i = 0, p = commit->parents;
 877                        p && i < sizeof(parents) - 1;
 878                        p = p->next)
 879                i += snprintf(parents + i, sizeof(parents) - i - 1, " %s",
 880                        sha1_to_hex(p->item->object.sha1));
 881        interp_set_entry(table, IPARENTS, parents + 1);
 882
 883        parents[1] = 0;
 884        for (i = 0, p = commit->parents;
 885                        p && i < sizeof(parents) - 1;
 886                        p = p->next)
 887                i += snprintf(parents + i, sizeof(parents) - i - 1, " %s",
 888                        find_unique_abbrev(p->item->object.sha1,
 889                                DEFAULT_ABBREV));
 890        interp_set_entry(table, IPARENTS_ABBREV, parents + 1);
 891
 892        for (i = 0, state = HEADER; msg[i] && state < BODY; i++) {
 893                int eol;
 894                for (eol = i; msg[eol] && msg[eol] != '\n'; eol++)
 895                        ; /* do nothing */
 896
 897                if (state == SUBJECT) {
 898                        table[ISUBJECT].value = xstrndup(msg + i, eol - i);
 899                        i = eol;
 900                }
 901                if (i == eol) {
 902                        state++;
 903                        /* strip empty lines */
 904                        while (msg[eol + 1] == '\n')
 905                                eol++;
 906                } else if (!prefixcmp(msg + i, "author "))
 907                        fill_person(table + IAUTHOR_NAME,
 908                                        msg + i + 7, eol - i - 7);
 909                else if (!prefixcmp(msg + i, "committer "))
 910                        fill_person(table + ICOMMITTER_NAME,
 911                                        msg + i + 10, eol - i - 10);
 912                else if (!prefixcmp(msg + i, "encoding "))
 913                        table[IENCODING].value =
 914                                xstrndup(msg + i + 9, eol - i - 9);
 915                i = eol;
 916        }
 917        if (msg[i])
 918                table[IBODY].value = xstrdup(msg + i);
 919        for (i = 0; i < ARRAY_SIZE(table); i++)
 920                if (!table[i].value)
 921                        interp_set_entry(table, i, "<unknown>");
 922
 923        do {
 924                char *buf = *buf_p;
 925                unsigned long space = *space_p;
 926
 927                space = interpolate(buf, space, user_format,
 928                                    table, ARRAY_SIZE(table));
 929                if (!space)
 930                        break;
 931                buf = xrealloc(buf, space);
 932                *buf_p = buf;
 933                *space_p = space;
 934        } while (1);
 935        interp_clear_table(table, ARRAY_SIZE(table));
 936
 937        return strlen(*buf_p);
 938}
 939
 940static void pp_header(enum cmit_fmt fmt,
 941                      int abbrev,
 942                      enum date_mode dmode,
 943                      const char *encoding,
 944                      const struct commit *commit,
 945                      const char **msg_p,
 946                      unsigned long *len_p,
 947                      unsigned long *ofs_p,
 948                      char **buf_p,
 949                      unsigned long *space_p)
 950{
 951        int parents_shown = 0;
 952
 953        for (;;) {
 954                const char *line = *msg_p;
 955                char *dst;
 956                int linelen = get_one_line(*msg_p, *len_p);
 957                unsigned long len;
 958
 959                if (!linelen)
 960                        return;
 961                *msg_p += linelen;
 962                *len_p -= linelen;
 963
 964                if (linelen == 1)
 965                        /* End of header */
 966                        return;
 967
 968                ALLOC_GROW(*buf_p, linelen + *ofs_p + 20, *space_p);
 969                dst = *buf_p + *ofs_p;
 970
 971                if (fmt == CMIT_FMT_RAW) {
 972                        memcpy(dst, line, linelen);
 973                        *ofs_p += linelen;
 974                        continue;
 975                }
 976
 977                if (!memcmp(line, "parent ", 7)) {
 978                        if (linelen != 48)
 979                                die("bad parent line in commit");
 980                        continue;
 981                }
 982
 983                if (!parents_shown) {
 984                        struct commit_list *parent;
 985                        int num;
 986                        for (parent = commit->parents, num = 0;
 987                             parent;
 988                             parent = parent->next, num++)
 989                                ;
 990                        /* with enough slop */
 991                        num = *ofs_p + num * 50 + 20;
 992                        ALLOC_GROW(*buf_p, num, *space_p);
 993                        dst = *buf_p + *ofs_p;
 994                        *ofs_p += add_merge_info(fmt, dst, commit, abbrev);
 995                        parents_shown = 1;
 996                }
 997
 998                /*
 999                 * MEDIUM == DEFAULT shows only author with dates.
1000                 * FULL shows both authors but not dates.
1001                 * FULLER shows both authors and dates.
1002                 */
1003                if (!memcmp(line, "author ", 7)) {
1004                        len = linelen;
1005                        if (fmt == CMIT_FMT_EMAIL)
1006                                len = bound_rfc2047(linelen, encoding);
1007                        ALLOC_GROW(*buf_p, *ofs_p + len + 80, *space_p);
1008                        dst = *buf_p + *ofs_p;
1009                        *ofs_p += add_user_info("Author", fmt, dst,
1010                                                line + 7, dmode, encoding);
1011                }
1012
1013                if (!memcmp(line, "committer ", 10) &&
1014                    (fmt == CMIT_FMT_FULL || fmt == CMIT_FMT_FULLER)) {
1015                        len = linelen;
1016                        if (fmt == CMIT_FMT_EMAIL)
1017                                len = bound_rfc2047(linelen, encoding);
1018                        ALLOC_GROW(*buf_p, *ofs_p + len + 80, *space_p);
1019                        dst = *buf_p + *ofs_p;
1020                        *ofs_p += add_user_info("Commit", fmt, dst,
1021                                                line + 10, dmode, encoding);
1022                }
1023        }
1024}
1025
1026static void pp_title_line(enum cmit_fmt fmt,
1027                          const char **msg_p,
1028                          unsigned long *len_p,
1029                          unsigned long *ofs_p,
1030                          char **buf_p,
1031                          unsigned long *space_p,
1032                          int indent,
1033                          const char *subject,
1034                          const char *after_subject,
1035                          const char *encoding,
1036                          int plain_non_ascii)
1037{
1038        char *title;
1039        unsigned long title_alloc, title_len;
1040        unsigned long len;
1041
1042        title_len = 0;
1043        title_alloc = 80;
1044        title = xmalloc(title_alloc);
1045        for (;;) {
1046                const char *line = *msg_p;
1047                int linelen = get_one_line(line, *len_p);
1048                *msg_p += linelen;
1049                *len_p -= linelen;
1050
1051                if (!linelen || is_empty_line(line, &linelen))
1052                        break;
1053
1054                if (title_alloc <= title_len + linelen + 2) {
1055                        title_alloc = title_len + linelen + 80;
1056                        title = xrealloc(title, title_alloc);
1057                }
1058                len = 0;
1059                if (title_len) {
1060                        if (fmt == CMIT_FMT_EMAIL) {
1061                                len++;
1062                                title[title_len++] = '\n';
1063                        }
1064                        len++;
1065                        title[title_len++] = ' ';
1066                }
1067                memcpy(title + title_len, line, linelen);
1068                title_len += linelen;
1069        }
1070
1071        /* Enough slop for the MIME header and rfc2047 */
1072        len = bound_rfc2047(title_len, encoding)+ 1000;
1073        if (subject)
1074                len += strlen(subject);
1075        if (after_subject)
1076                len += strlen(after_subject);
1077        if (encoding)
1078                len += strlen(encoding);
1079        ALLOC_GROW(*buf_p, title_len + *ofs_p + len, *space_p);
1080
1081        if (subject) {
1082                len = strlen(subject);
1083                memcpy(*buf_p + *ofs_p, subject, len);
1084                *ofs_p += len;
1085                *ofs_p += add_rfc2047(*buf_p + *ofs_p,
1086                                      title, title_len, encoding);
1087        } else {
1088                memcpy(*buf_p + *ofs_p, title, title_len);
1089                *ofs_p += title_len;
1090        }
1091        (*buf_p)[(*ofs_p)++] = '\n';
1092        if (plain_non_ascii) {
1093                const char *header_fmt =
1094                        "MIME-Version: 1.0\n"
1095                        "Content-Type: text/plain; charset=%s\n"
1096                        "Content-Transfer-Encoding: 8bit\n";
1097                *ofs_p += snprintf(*buf_p + *ofs_p,
1098                                   *space_p - *ofs_p,
1099                                   header_fmt, encoding);
1100        }
1101        if (after_subject) {
1102                len = strlen(after_subject);
1103                memcpy(*buf_p + *ofs_p, after_subject, len);
1104                *ofs_p += len;
1105        }
1106        free(title);
1107        if (fmt == CMIT_FMT_EMAIL) {
1108                ALLOC_GROW(*buf_p, *ofs_p + 20, *space_p);
1109                (*buf_p)[(*ofs_p)++] = '\n';
1110        }
1111}
1112
1113static void pp_remainder(enum cmit_fmt fmt,
1114                         const char **msg_p,
1115                         unsigned long *len_p,
1116                         unsigned long *ofs_p,
1117                         char **buf_p,
1118                         unsigned long *space_p,
1119                         int indent)
1120{
1121        int first = 1;
1122        for (;;) {
1123                const char *line = *msg_p;
1124                int linelen = get_one_line(line, *len_p);
1125                *msg_p += linelen;
1126                *len_p -= linelen;
1127
1128                if (!linelen)
1129                        break;
1130
1131                if (is_empty_line(line, &linelen)) {
1132                        if (first)
1133                                continue;
1134                        if (fmt == CMIT_FMT_SHORT)
1135                                break;
1136                }
1137                first = 0;
1138
1139                ALLOC_GROW(*buf_p, *ofs_p + linelen + indent + 20, *space_p);
1140                if (indent) {
1141                        memset(*buf_p + *ofs_p, ' ', indent);
1142                        *ofs_p += indent;
1143                }
1144                memcpy(*buf_p + *ofs_p, line, linelen);
1145                *ofs_p += linelen;
1146                (*buf_p)[(*ofs_p)++] = '\n';
1147        }
1148}
1149
1150unsigned long pretty_print_commit(enum cmit_fmt fmt,
1151                                  const struct commit *commit,
1152                                  unsigned long len,
1153                                  char **buf_p, unsigned long *space_p,
1154                                  int abbrev, const char *subject,
1155                                  const char *after_subject,
1156                                  enum date_mode dmode)
1157{
1158        unsigned long offset = 0;
1159        unsigned long beginning_of_body;
1160        int indent = 4;
1161        const char *msg = commit->buffer;
1162        int plain_non_ascii = 0;
1163        char *reencoded;
1164        const char *encoding;
1165        char *buf;
1166
1167        if (fmt == CMIT_FMT_USERFORMAT)
1168                return format_commit_message(commit, msg, buf_p, space_p);
1169
1170        encoding = (git_log_output_encoding
1171                    ? git_log_output_encoding
1172                    : git_commit_encoding);
1173        if (!encoding)
1174                encoding = "utf-8";
1175        reencoded = logmsg_reencode(commit, encoding);
1176        if (reencoded) {
1177                msg = reencoded;
1178                len = strlen(reencoded);
1179        }
1180
1181        if (fmt == CMIT_FMT_ONELINE || fmt == CMIT_FMT_EMAIL)
1182                indent = 0;
1183
1184        /* After-subject is used to pass in Content-Type: multipart
1185         * MIME header; in that case we do not have to do the
1186         * plaintext content type even if the commit message has
1187         * non 7-bit ASCII character.  Otherwise, check if we need
1188         * to say this is not a 7-bit ASCII.
1189         */
1190        if (fmt == CMIT_FMT_EMAIL && !after_subject) {
1191                int i, ch, in_body;
1192
1193                for (in_body = i = 0; (ch = msg[i]) && i < len; i++) {
1194                        if (!in_body) {
1195                                /* author could be non 7-bit ASCII but
1196                                 * the log may be so; skip over the
1197                                 * header part first.
1198                                 */
1199                                if (ch == '\n' &&
1200                                    i + 1 < len && msg[i+1] == '\n')
1201                                        in_body = 1;
1202                        }
1203                        else if (non_ascii(ch)) {
1204                                plain_non_ascii = 1;
1205                                break;
1206                        }
1207                }
1208        }
1209
1210        pp_header(fmt, abbrev, dmode, encoding,
1211                  commit, &msg, &len,
1212                  &offset, buf_p, space_p);
1213        if (fmt != CMIT_FMT_ONELINE && !subject) {
1214                ALLOC_GROW(*buf_p, offset + 20, *space_p);
1215                (*buf_p)[offset++] = '\n';
1216        }
1217
1218        /* Skip excess blank lines at the beginning of body, if any... */
1219        for (;;) {
1220                int linelen = get_one_line(msg, len);
1221                int ll = linelen;
1222                if (!linelen)
1223                        break;
1224                if (!is_empty_line(msg, &ll))
1225                        break;
1226                msg += linelen;
1227                len -= linelen;
1228        }
1229
1230        /* These formats treat the title line specially. */
1231        if (fmt == CMIT_FMT_ONELINE
1232            || fmt == CMIT_FMT_EMAIL)
1233                pp_title_line(fmt, &msg, &len, &offset,
1234                              buf_p, space_p, indent,
1235                              subject, after_subject, encoding,
1236                              plain_non_ascii);
1237
1238        beginning_of_body = offset;
1239        if (fmt != CMIT_FMT_ONELINE)
1240                pp_remainder(fmt, &msg, &len, &offset,
1241                             buf_p, space_p, indent);
1242
1243        while (offset && isspace((*buf_p)[offset-1]))
1244                offset--;
1245
1246        ALLOC_GROW(*buf_p, offset + 20, *space_p);
1247        buf = *buf_p;
1248
1249        /* Make sure there is an EOLN for the non-oneline case */
1250        if (fmt != CMIT_FMT_ONELINE)
1251                buf[offset++] = '\n';
1252
1253        /*
1254         * The caller may append additional body text in e-mail
1255         * format.  Make sure we did not strip the blank line
1256         * between the header and the body.
1257         */
1258        if (fmt == CMIT_FMT_EMAIL && offset <= beginning_of_body)
1259                buf[offset++] = '\n';
1260        buf[offset] = '\0';
1261        free(reencoded);
1262        return offset;
1263}
1264
1265struct commit *pop_commit(struct commit_list **stack)
1266{
1267        struct commit_list *top = *stack;
1268        struct commit *item = top ? top->item : NULL;
1269
1270        if (top) {
1271                *stack = top->next;
1272                free(top);
1273        }
1274        return item;
1275}
1276
1277void topo_sort_default_setter(struct commit *c, void *data)
1278{
1279        c->util = data;
1280}
1281
1282void *topo_sort_default_getter(struct commit *c)
1283{
1284        return c->util;
1285}
1286
1287/*
1288 * Performs an in-place topological sort on the list supplied.
1289 */
1290void sort_in_topological_order(struct commit_list ** list, int lifo)
1291{
1292        sort_in_topological_order_fn(list, lifo, topo_sort_default_setter,
1293                                     topo_sort_default_getter);
1294}
1295
1296void sort_in_topological_order_fn(struct commit_list ** list, int lifo,
1297                                  topo_sort_set_fn_t setter,
1298                                  topo_sort_get_fn_t getter)
1299{
1300        struct commit_list * next = *list;
1301        struct commit_list * work = NULL, **insert;
1302        struct commit_list ** pptr = list;
1303        struct sort_node * nodes;
1304        struct sort_node * next_nodes;
1305        int count = 0;
1306
1307        /* determine the size of the list */
1308        while (next) {
1309                next = next->next;
1310                count++;
1311        }
1312
1313        if (!count)
1314                return;
1315        /* allocate an array to help sort the list */
1316        nodes = xcalloc(count, sizeof(*nodes));
1317        /* link the list to the array */
1318        next_nodes = nodes;
1319        next=*list;
1320        while (next) {
1321                next_nodes->list_item = next;
1322                setter(next->item, next_nodes);
1323                next_nodes++;
1324                next = next->next;
1325        }
1326        /* update the indegree */
1327        next=*list;
1328        while (next) {
1329                struct commit_list * parents = next->item->parents;
1330                while (parents) {
1331                        struct commit * parent=parents->item;
1332                        struct sort_node * pn = (struct sort_node *) getter(parent);
1333
1334                        if (pn)
1335                                pn->indegree++;
1336                        parents=parents->next;
1337                }
1338                next=next->next;
1339        }
1340        /*
1341         * find the tips
1342         *
1343         * tips are nodes not reachable from any other node in the list
1344         *
1345         * the tips serve as a starting set for the work queue.
1346         */
1347        next=*list;
1348        insert = &work;
1349        while (next) {
1350                struct sort_node * node = (struct sort_node *) getter(next->item);
1351
1352                if (node->indegree == 0) {
1353                        insert = &commit_list_insert(next->item, insert)->next;
1354                }
1355                next=next->next;
1356        }
1357
1358        /* process the list in topological order */
1359        if (!lifo)
1360                sort_by_date(&work);
1361        while (work) {
1362                struct commit * work_item = pop_commit(&work);
1363                struct sort_node * work_node = (struct sort_node *) getter(work_item);
1364                struct commit_list * parents = work_item->parents;
1365
1366                while (parents) {
1367                        struct commit * parent=parents->item;
1368                        struct sort_node * pn = (struct sort_node *) getter(parent);
1369
1370                        if (pn) {
1371                                /*
1372                                 * parents are only enqueued for emission
1373                                 * when all their children have been emitted thereby
1374                                 * guaranteeing topological order.
1375                                 */
1376                                pn->indegree--;
1377                                if (!pn->indegree) {
1378                                        if (!lifo)
1379                                                insert_by_date(parent, &work);
1380                                        else
1381                                                commit_list_insert(parent, &work);
1382                                }
1383                        }
1384                        parents=parents->next;
1385                }
1386                /*
1387                 * work_item is a commit all of whose children
1388                 * have already been emitted. we can emit it now.
1389                 */
1390                *pptr = work_node->list_item;
1391                pptr = &(*pptr)->next;
1392                *pptr = NULL;
1393                setter(work_item, NULL);
1394        }
1395        free(nodes);
1396}
1397
1398/* merge-base stuff */
1399
1400/* bits #0..15 in revision.h */
1401#define PARENT1         (1u<<16)
1402#define PARENT2         (1u<<17)
1403#define STALE           (1u<<18)
1404#define RESULT          (1u<<19)
1405
1406static const unsigned all_flags = (PARENT1 | PARENT2 | STALE | RESULT);
1407
1408static struct commit *interesting(struct commit_list *list)
1409{
1410        while (list) {
1411                struct commit *commit = list->item;
1412                list = list->next;
1413                if (commit->object.flags & STALE)
1414                        continue;
1415                return commit;
1416        }
1417        return NULL;
1418}
1419
1420static struct commit_list *merge_bases(struct commit *one, struct commit *two)
1421{
1422        struct commit_list *list = NULL;
1423        struct commit_list *result = NULL;
1424
1425        if (one == two)
1426                /* We do not mark this even with RESULT so we do not
1427                 * have to clean it up.
1428                 */
1429                return commit_list_insert(one, &result);
1430
1431        parse_commit(one);
1432        parse_commit(two);
1433
1434        one->object.flags |= PARENT1;
1435        two->object.flags |= PARENT2;
1436        insert_by_date(one, &list);
1437        insert_by_date(two, &list);
1438
1439        while (interesting(list)) {
1440                struct commit *commit;
1441                struct commit_list *parents;
1442                struct commit_list *n;
1443                int flags;
1444
1445                commit = list->item;
1446                n = list->next;
1447                free(list);
1448                list = n;
1449
1450                flags = commit->object.flags & (PARENT1 | PARENT2 | STALE);
1451                if (flags == (PARENT1 | PARENT2)) {
1452                        if (!(commit->object.flags & RESULT)) {
1453                                commit->object.flags |= RESULT;
1454                                insert_by_date(commit, &result);
1455                        }
1456                        /* Mark parents of a found merge stale */
1457                        flags |= STALE;
1458                }
1459                parents = commit->parents;
1460                while (parents) {
1461                        struct commit *p = parents->item;
1462                        parents = parents->next;
1463                        if ((p->object.flags & flags) == flags)
1464                                continue;
1465                        parse_commit(p);
1466                        p->object.flags |= flags;
1467                        insert_by_date(p, &list);
1468                }
1469        }
1470
1471        /* Clean up the result to remove stale ones */
1472        free_commit_list(list);
1473        list = result; result = NULL;
1474        while (list) {
1475                struct commit_list *n = list->next;
1476                if (!(list->item->object.flags & STALE))
1477                        insert_by_date(list->item, &result);
1478                free(list);
1479                list = n;
1480        }
1481        return result;
1482}
1483
1484struct commit_list *get_merge_bases(struct commit *one,
1485                                    struct commit *two,
1486                                    int cleanup)
1487{
1488        struct commit_list *list;
1489        struct commit **rslt;
1490        struct commit_list *result;
1491        int cnt, i, j;
1492
1493        result = merge_bases(one, two);
1494        if (one == two)
1495                return result;
1496        if (!result || !result->next) {
1497                if (cleanup) {
1498                        clear_commit_marks(one, all_flags);
1499                        clear_commit_marks(two, all_flags);
1500                }
1501                return result;
1502        }
1503
1504        /* There are more than one */
1505        cnt = 0;
1506        list = result;
1507        while (list) {
1508                list = list->next;
1509                cnt++;
1510        }
1511        rslt = xcalloc(cnt, sizeof(*rslt));
1512        for (list = result, i = 0; list; list = list->next)
1513                rslt[i++] = list->item;
1514        free_commit_list(result);
1515
1516        clear_commit_marks(one, all_flags);
1517        clear_commit_marks(two, all_flags);
1518        for (i = 0; i < cnt - 1; i++) {
1519                for (j = i+1; j < cnt; j++) {
1520                        if (!rslt[i] || !rslt[j])
1521                                continue;
1522                        result = merge_bases(rslt[i], rslt[j]);
1523                        clear_commit_marks(rslt[i], all_flags);
1524                        clear_commit_marks(rslt[j], all_flags);
1525                        for (list = result; list; list = list->next) {
1526                                if (rslt[i] == list->item)
1527                                        rslt[i] = NULL;
1528                                if (rslt[j] == list->item)
1529                                        rslt[j] = NULL;
1530                        }
1531                }
1532        }
1533
1534        /* Surviving ones in rslt[] are the independent results */
1535        result = NULL;
1536        for (i = 0; i < cnt; i++) {
1537                if (rslt[i])
1538                        insert_by_date(rslt[i], &result);
1539        }
1540        free(rslt);
1541        return result;
1542}
1543
1544int in_merge_bases(struct commit *commit, struct commit **reference, int num)
1545{
1546        struct commit_list *bases, *b;
1547        int ret = 0;
1548
1549        if (num == 1)
1550                bases = get_merge_bases(commit, *reference, 1);
1551        else
1552                die("not yet");
1553        for (b = bases; b; b = b->next) {
1554                if (!hashcmp(commit->object.sha1, b->item->object.sha1)) {
1555                        ret = 1;
1556                        break;
1557                }
1558        }
1559
1560        free_commit_list(bases);
1561        return ret;
1562}