Andrew's git / gitweb.git / commit.c
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commit.con commit Handle return code of parse_commit in revision machinery (cc0e6c5)
   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
  30struct 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                if (is_rfc2047_special(ch)) {
 515                        sprintf(bp, "=%02X", ch);
 516                        bp += 3;
 517                }
 518                else if (ch == ' ')
 519                        *bp++ = '_';
 520                else
 521                        *bp++ = ch;
 522        }
 523        memcpy(bp, "?=", 2);
 524        bp += 2;
 525        return bp - buf;
 526}
 527
 528static int add_user_info(const char *what, enum cmit_fmt fmt, char *buf,
 529                         const char *line, enum date_mode dmode,
 530                         const char *encoding)
 531{
 532        char *date;
 533        int namelen;
 534        unsigned long time;
 535        int tz, ret;
 536        const char *filler = "    ";
 537
 538        if (fmt == CMIT_FMT_ONELINE)
 539                return 0;
 540        date = strchr(line, '>');
 541        if (!date)
 542                return 0;
 543        namelen = ++date - line;
 544        time = strtoul(date, &date, 10);
 545        tz = strtol(date, NULL, 10);
 546
 547        if (fmt == CMIT_FMT_EMAIL) {
 548                char *name_tail = strchr(line, '<');
 549                int display_name_length;
 550                if (!name_tail)
 551                        return 0;
 552                while (line < name_tail && isspace(name_tail[-1]))
 553                        name_tail--;
 554                display_name_length = name_tail - line;
 555                filler = "";
 556                strcpy(buf, "From: ");
 557                ret = strlen(buf);
 558                ret += add_rfc2047(buf + ret, line, display_name_length,
 559                                   encoding);
 560                memcpy(buf + ret, name_tail, namelen - display_name_length);
 561                ret += namelen - display_name_length;
 562                buf[ret++] = '\n';
 563        }
 564        else {
 565                ret = sprintf(buf, "%s: %.*s%.*s\n", what,
 566                              (fmt == CMIT_FMT_FULLER) ? 4 : 0,
 567                              filler, namelen, line);
 568        }
 569        switch (fmt) {
 570        case CMIT_FMT_MEDIUM:
 571                ret += sprintf(buf + ret, "Date:   %s\n",
 572                               show_date(time, tz, dmode));
 573                break;
 574        case CMIT_FMT_EMAIL:
 575                ret += sprintf(buf + ret, "Date: %s\n",
 576                               show_rfc2822_date(time, tz));
 577                break;
 578        case CMIT_FMT_FULLER:
 579                ret += sprintf(buf + ret, "%sDate: %s\n", what,
 580                               show_date(time, tz, dmode));
 581                break;
 582        default:
 583                /* notin' */
 584                break;
 585        }
 586        return ret;
 587}
 588
 589static int is_empty_line(const char *line, int *len_p)
 590{
 591        int len = *len_p;
 592        while (len && isspace(line[len-1]))
 593                len--;
 594        *len_p = len;
 595        return !len;
 596}
 597
 598static int add_merge_info(enum cmit_fmt fmt, char *buf, const struct commit *commit, int abbrev)
 599{
 600        struct commit_list *parent = commit->parents;
 601        int offset;
 602
 603        if ((fmt == CMIT_FMT_ONELINE) || (fmt == CMIT_FMT_EMAIL) ||
 604            !parent || !parent->next)
 605                return 0;
 606
 607        offset = sprintf(buf, "Merge:");
 608
 609        while (parent) {
 610                struct commit *p = parent->item;
 611                const char *hex = NULL;
 612                const char *dots;
 613                if (abbrev)
 614                        hex = find_unique_abbrev(p->object.sha1, abbrev);
 615                if (!hex)
 616                        hex = sha1_to_hex(p->object.sha1);
 617                dots = (abbrev && strlen(hex) != 40) ?  "..." : "";
 618                parent = parent->next;
 619
 620                offset += sprintf(buf + offset, " %s%s", hex, dots);
 621        }
 622        buf[offset++] = '\n';
 623        return offset;
 624}
 625
 626static char *get_header(const struct commit *commit, const char *key)
 627{
 628        int key_len = strlen(key);
 629        const char *line = commit->buffer;
 630
 631        for (;;) {
 632                const char *eol = strchr(line, '\n'), *next;
 633
 634                if (line == eol)
 635                        return NULL;
 636                if (!eol) {
 637                        eol = line + strlen(line);
 638                        next = NULL;
 639                } else
 640                        next = eol + 1;
 641                if (!strncmp(line, key, key_len) && line[key_len] == ' ') {
 642                        int len = eol - line - key_len;
 643                        char *ret = xmalloc(len);
 644                        memcpy(ret, line + key_len + 1, len - 1);
 645                        ret[len - 1] = '\0';
 646                        return ret;
 647                }
 648                line = next;
 649        }
 650}
 651
 652static char *replace_encoding_header(char *buf, const char *encoding)
 653{
 654        char *encoding_header = strstr(buf, "\nencoding ");
 655        char *header_end = strstr(buf, "\n\n");
 656        char *end_of_encoding_header;
 657        int encoding_header_pos;
 658        int encoding_header_len;
 659        int new_len;
 660        int need_len;
 661        int buflen = strlen(buf) + 1;
 662
 663        if (!header_end)
 664                header_end = buf + buflen;
 665        if (!encoding_header || encoding_header >= header_end)
 666                return buf;
 667        encoding_header++;
 668        end_of_encoding_header = strchr(encoding_header, '\n');
 669        if (!end_of_encoding_header)
 670                return buf; /* should not happen but be defensive */
 671        end_of_encoding_header++;
 672
 673        encoding_header_len = end_of_encoding_header - encoding_header;
 674        encoding_header_pos = encoding_header - buf;
 675
 676        if (is_encoding_utf8(encoding)) {
 677                /* we have re-coded to UTF-8; drop the header */
 678                memmove(encoding_header, end_of_encoding_header,
 679                        buflen - (encoding_header_pos + encoding_header_len));
 680                return buf;
 681        }
 682        new_len = strlen(encoding);
 683        need_len = new_len + strlen("encoding \n");
 684        if (encoding_header_len < need_len) {
 685                buf = xrealloc(buf, buflen + (need_len - encoding_header_len));
 686                encoding_header = buf + encoding_header_pos;
 687                end_of_encoding_header = encoding_header + encoding_header_len;
 688        }
 689        memmove(end_of_encoding_header + (need_len - encoding_header_len),
 690                end_of_encoding_header,
 691                buflen - (encoding_header_pos + encoding_header_len));
 692        memcpy(encoding_header + 9, encoding, strlen(encoding));
 693        encoding_header[9 + new_len] = '\n';
 694        return buf;
 695}
 696
 697static char *logmsg_reencode(const struct commit *commit,
 698                             const char *output_encoding)
 699{
 700        static const char *utf8 = "utf-8";
 701        const char *use_encoding;
 702        char *encoding;
 703        char *out;
 704
 705        if (!*output_encoding)
 706                return NULL;
 707        encoding = get_header(commit, "encoding");
 708        use_encoding = encoding ? encoding : utf8;
 709        if (!strcmp(use_encoding, output_encoding))
 710                out = xstrdup(commit->buffer);
 711        else
 712                out = reencode_string(commit->buffer,
 713                                      output_encoding, use_encoding);
 714        if (out)
 715                out = replace_encoding_header(out, output_encoding);
 716
 717        free(encoding);
 718        return out;
 719}
 720
 721static void fill_person(struct interp *table, const char *msg, int len)
 722{
 723        int start, end, tz = 0;
 724        unsigned long date;
 725        char *ep;
 726
 727        /* parse name */
 728        for (end = 0; end < len && msg[end] != '<'; end++)
 729                ; /* do nothing */
 730        start = end + 1;
 731        while (end > 0 && isspace(msg[end - 1]))
 732                end--;
 733        table[0].value = xstrndup(msg, end);
 734
 735        if (start >= len)
 736                return;
 737
 738        /* parse email */
 739        for (end = start + 1; end < len && msg[end] != '>'; end++)
 740                ; /* do nothing */
 741
 742        if (end >= len)
 743                return;
 744
 745        table[1].value = xstrndup(msg + start, end - start);
 746
 747        /* parse date */
 748        for (start = end + 1; start < len && isspace(msg[start]); start++)
 749                ; /* do nothing */
 750        if (start >= len)
 751                return;
 752        date = strtoul(msg + start, &ep, 10);
 753        if (msg + start == ep)
 754                return;
 755
 756        table[5].value = xstrndup(msg + start, ep - (msg + start));
 757
 758        /* parse tz */
 759        for (start = ep - msg + 1; start < len && isspace(msg[start]); start++)
 760                ; /* do nothing */
 761        if (start + 1 < len) {
 762                tz = strtoul(msg + start + 1, NULL, 10);
 763                if (msg[start] == '-')
 764                        tz = -tz;
 765        }
 766
 767        interp_set_entry(table, 2, show_date(date, tz, 0));
 768        interp_set_entry(table, 3, show_rfc2822_date(date, tz));
 769        interp_set_entry(table, 4, show_date(date, tz, 1));
 770}
 771
 772static long format_commit_message(const struct commit *commit,
 773                const char *msg, char *buf, unsigned long space)
 774{
 775        struct interp table[] = {
 776                { "%H" },       /* commit hash */
 777                { "%h" },       /* abbreviated commit hash */
 778                { "%T" },       /* tree hash */
 779                { "%t" },       /* abbreviated tree hash */
 780                { "%P" },       /* parent hashes */
 781                { "%p" },       /* abbreviated parent hashes */
 782                { "%an" },      /* author name */
 783                { "%ae" },      /* author email */
 784                { "%ad" },      /* author date */
 785                { "%aD" },      /* author date, RFC2822 style */
 786                { "%ar" },      /* author date, relative */
 787                { "%at" },      /* author date, UNIX timestamp */
 788                { "%cn" },      /* committer name */
 789                { "%ce" },      /* committer email */
 790                { "%cd" },      /* committer date */
 791                { "%cD" },      /* committer date, RFC2822 style */
 792                { "%cr" },      /* committer date, relative */
 793                { "%ct" },      /* committer date, UNIX timestamp */
 794                { "%e" },       /* encoding */
 795                { "%s" },       /* subject */
 796                { "%b" },       /* body */
 797                { "%Cred" },    /* red */
 798                { "%Cgreen" },  /* green */
 799                { "%Cblue" },   /* blue */
 800                { "%Creset" },  /* reset color */
 801                { "%n" },       /* newline */
 802                { "%m" },       /* left/right/bottom */
 803        };
 804        enum interp_index {
 805                IHASH = 0, IHASH_ABBREV,
 806                ITREE, ITREE_ABBREV,
 807                IPARENTS, IPARENTS_ABBREV,
 808                IAUTHOR_NAME, IAUTHOR_EMAIL,
 809                IAUTHOR_DATE, IAUTHOR_DATE_RFC2822, IAUTHOR_DATE_RELATIVE,
 810                IAUTHOR_TIMESTAMP,
 811                ICOMMITTER_NAME, ICOMMITTER_EMAIL,
 812                ICOMMITTER_DATE, ICOMMITTER_DATE_RFC2822,
 813                ICOMMITTER_DATE_RELATIVE, ICOMMITTER_TIMESTAMP,
 814                IENCODING,
 815                ISUBJECT,
 816                IBODY,
 817                IRED, IGREEN, IBLUE, IRESET_COLOR,
 818                INEWLINE,
 819                ILEFT_RIGHT,
 820        };
 821        struct commit_list *p;
 822        char parents[1024];
 823        int i;
 824        enum { HEADER, SUBJECT, BODY } state;
 825
 826        if (ILEFT_RIGHT + 1 != ARRAY_SIZE(table))
 827                die("invalid interp table!");
 828
 829        /* these are independent of the commit */
 830        interp_set_entry(table, IRED, "\033[31m");
 831        interp_set_entry(table, IGREEN, "\033[32m");
 832        interp_set_entry(table, IBLUE, "\033[34m");
 833        interp_set_entry(table, IRESET_COLOR, "\033[m");
 834        interp_set_entry(table, INEWLINE, "\n");
 835
 836        /* these depend on the commit */
 837        if (!commit->object.parsed)
 838                parse_object(commit->object.sha1);
 839        interp_set_entry(table, IHASH, sha1_to_hex(commit->object.sha1));
 840        interp_set_entry(table, IHASH_ABBREV,
 841                        find_unique_abbrev(commit->object.sha1,
 842                                DEFAULT_ABBREV));
 843        interp_set_entry(table, ITREE, sha1_to_hex(commit->tree->object.sha1));
 844        interp_set_entry(table, ITREE_ABBREV,
 845                        find_unique_abbrev(commit->tree->object.sha1,
 846                                DEFAULT_ABBREV));
 847        interp_set_entry(table, ILEFT_RIGHT,
 848                         (commit->object.flags & BOUNDARY)
 849                         ? "-"
 850                         : (commit->object.flags & SYMMETRIC_LEFT)
 851                         ? "<"
 852                         : ">");
 853
 854        parents[1] = 0;
 855        for (i = 0, p = commit->parents;
 856                        p && i < sizeof(parents) - 1;
 857                        p = p->next)
 858                i += snprintf(parents + i, sizeof(parents) - i - 1, " %s",
 859                        sha1_to_hex(p->item->object.sha1));
 860        interp_set_entry(table, IPARENTS, parents + 1);
 861
 862        parents[1] = 0;
 863        for (i = 0, p = commit->parents;
 864                        p && i < sizeof(parents) - 1;
 865                        p = p->next)
 866                i += snprintf(parents + i, sizeof(parents) - i - 1, " %s",
 867                        find_unique_abbrev(p->item->object.sha1,
 868                                DEFAULT_ABBREV));
 869        interp_set_entry(table, IPARENTS_ABBREV, parents + 1);
 870
 871        for (i = 0, state = HEADER; msg[i] && state < BODY; i++) {
 872                int eol;
 873                for (eol = i; msg[eol] && msg[eol] != '\n'; eol++)
 874                        ; /* do nothing */
 875
 876                if (state == SUBJECT) {
 877                        table[ISUBJECT].value = xstrndup(msg + i, eol - i);
 878                        i = eol;
 879                }
 880                if (i == eol) {
 881                        state++;
 882                        /* strip empty lines */
 883                        while (msg[eol + 1] == '\n')
 884                                eol++;
 885                } else if (!prefixcmp(msg + i, "author "))
 886                        fill_person(table + IAUTHOR_NAME,
 887                                        msg + i + 7, eol - i - 7);
 888                else if (!prefixcmp(msg + i, "committer "))
 889                        fill_person(table + ICOMMITTER_NAME,
 890                                        msg + i + 10, eol - i - 10);
 891                else if (!prefixcmp(msg + i, "encoding "))
 892                        table[IENCODING].value =
 893                                xstrndup(msg + i + 9, eol - i - 9);
 894                i = eol;
 895        }
 896        if (msg[i])
 897                table[IBODY].value = xstrdup(msg + i);
 898        for (i = 0; i < ARRAY_SIZE(table); i++)
 899                if (!table[i].value)
 900                        interp_set_entry(table, i, "<unknown>");
 901
 902        interpolate(buf, space, user_format, table, ARRAY_SIZE(table));
 903        interp_clear_table(table, ARRAY_SIZE(table));
 904
 905        return strlen(buf);
 906}
 907
 908unsigned long pretty_print_commit(enum cmit_fmt fmt,
 909                                  const struct commit *commit,
 910                                  unsigned long len,
 911                                  char *buf, unsigned long space,
 912                                  int abbrev, const char *subject,
 913                                  const char *after_subject,
 914                                  enum date_mode dmode)
 915{
 916        int hdr = 1, body = 0, seen_title = 0;
 917        unsigned long offset = 0;
 918        int indent = 4;
 919        int parents_shown = 0;
 920        const char *msg = commit->buffer;
 921        int plain_non_ascii = 0;
 922        char *reencoded;
 923        const char *encoding;
 924
 925        if (fmt == CMIT_FMT_USERFORMAT)
 926                return format_commit_message(commit, msg, buf, space);
 927
 928        encoding = (git_log_output_encoding
 929                    ? git_log_output_encoding
 930                    : git_commit_encoding);
 931        if (!encoding)
 932                encoding = "utf-8";
 933        reencoded = logmsg_reencode(commit, encoding);
 934        if (reencoded)
 935                msg = reencoded;
 936
 937        if (fmt == CMIT_FMT_ONELINE || fmt == CMIT_FMT_EMAIL)
 938                indent = 0;
 939
 940        /* After-subject is used to pass in Content-Type: multipart
 941         * MIME header; in that case we do not have to do the
 942         * plaintext content type even if the commit message has
 943         * non 7-bit ASCII character.  Otherwise, check if we need
 944         * to say this is not a 7-bit ASCII.
 945         */
 946        if (fmt == CMIT_FMT_EMAIL && !after_subject) {
 947                int i, ch, in_body;
 948
 949                for (in_body = i = 0; (ch = msg[i]) && i < len; i++) {
 950                        if (!in_body) {
 951                                /* author could be non 7-bit ASCII but
 952                                 * the log may be so; skip over the
 953                                 * header part first.
 954                                 */
 955                                if (ch == '\n' &&
 956                                    i + 1 < len && msg[i+1] == '\n')
 957                                        in_body = 1;
 958                        }
 959                        else if (non_ascii(ch)) {
 960                                plain_non_ascii = 1;
 961                                break;
 962                        }
 963                }
 964        }
 965
 966        for (;;) {
 967                const char *line = msg;
 968                int linelen = get_one_line(msg, len);
 969
 970                if (!linelen)
 971                        break;
 972
 973                /*
 974                 * We want some slop for indentation and a possible
 975                 * final "...". Thus the "+ 20".
 976                 */
 977                if (offset + linelen + 20 > space) {
 978                        memcpy(buf + offset, "    ...\n", 8);
 979                        offset += 8;
 980                        break;
 981                }
 982
 983                msg += linelen;
 984                len -= linelen;
 985                if (hdr) {
 986                        if (linelen == 1) {
 987                                hdr = 0;
 988                                if ((fmt != CMIT_FMT_ONELINE) && !subject)
 989                                        buf[offset++] = '\n';
 990                                continue;
 991                        }
 992                        if (fmt == CMIT_FMT_RAW) {
 993                                memcpy(buf + offset, line, linelen);
 994                                offset += linelen;
 995                                continue;
 996                        }
 997                        if (!memcmp(line, "parent ", 7)) {
 998                                if (linelen != 48)
 999                                        die("bad parent line in commit");
1000                                continue;
1001                        }
1002
1003                        if (!parents_shown) {
1004                                offset += add_merge_info(fmt, buf + offset,
1005                                                         commit, abbrev);
1006                                parents_shown = 1;
1007                                continue;
1008                        }
1009                        /*
1010                         * MEDIUM == DEFAULT shows only author with dates.
1011                         * FULL shows both authors but not dates.
1012                         * FULLER shows both authors and dates.
1013                         */
1014                        if (!memcmp(line, "author ", 7))
1015                                offset += add_user_info("Author", fmt,
1016                                                        buf + offset,
1017                                                        line + 7,
1018                                                        dmode,
1019                                                        encoding);
1020                        if (!memcmp(line, "committer ", 10) &&
1021                            (fmt == CMIT_FMT_FULL || fmt == CMIT_FMT_FULLER))
1022                                offset += add_user_info("Commit", fmt,
1023                                                        buf + offset,
1024                                                        line + 10,
1025                                                        dmode,
1026                                                        encoding);
1027                        continue;
1028                }
1029
1030                if (!subject)
1031                        body = 1;
1032
1033                if (is_empty_line(line, &linelen)) {
1034                        if (!seen_title)
1035                                continue;
1036                        if (!body)
1037                                continue;
1038                        if (subject)
1039                                continue;
1040                        if (fmt == CMIT_FMT_SHORT)
1041                                break;
1042                }
1043
1044                seen_title = 1;
1045                if (subject) {
1046                        int slen = strlen(subject);
1047                        memcpy(buf + offset, subject, slen);
1048                        offset += slen;
1049                        offset += add_rfc2047(buf + offset, line, linelen,
1050                                              encoding);
1051                }
1052                else {
1053                        memset(buf + offset, ' ', indent);
1054                        memcpy(buf + offset + indent, line, linelen);
1055                        offset += linelen + indent;
1056                }
1057                buf[offset++] = '\n';
1058                if (fmt == CMIT_FMT_ONELINE)
1059                        break;
1060                if (subject && plain_non_ascii) {
1061                        int sz;
1062                        char header[512];
1063                        const char *header_fmt =
1064                                "Content-Type: text/plain; charset=%s\n"
1065                                "Content-Transfer-Encoding: 8bit\n";
1066                        sz = snprintf(header, sizeof(header), header_fmt,
1067                                      encoding);
1068                        if (sizeof(header) < sz)
1069                                die("Encoding name %s too long", encoding);
1070                        memcpy(buf + offset, header, sz);
1071                        offset += sz;
1072                }
1073                if (after_subject) {
1074                        int slen = strlen(after_subject);
1075                        if (slen > space - offset - 1)
1076                                slen = space - offset - 1;
1077                        memcpy(buf + offset, after_subject, slen);
1078                        offset += slen;
1079                        after_subject = NULL;
1080                }
1081                subject = NULL;
1082        }
1083        while (offset && isspace(buf[offset-1]))
1084                offset--;
1085        /* Make sure there is an EOLN for the non-oneline case */
1086        if (fmt != CMIT_FMT_ONELINE)
1087                buf[offset++] = '\n';
1088        /*
1089         * make sure there is another EOLN to separate the headers from whatever
1090         * body the caller appends if we haven't already written a body
1091         */
1092        if (fmt == CMIT_FMT_EMAIL && !body)
1093                buf[offset++] = '\n';
1094        buf[offset] = '\0';
1095
1096        free(reencoded);
1097        return offset;
1098}
1099
1100struct commit *pop_commit(struct commit_list **stack)
1101{
1102        struct commit_list *top = *stack;
1103        struct commit *item = top ? top->item : NULL;
1104
1105        if (top) {
1106                *stack = top->next;
1107                free(top);
1108        }
1109        return item;
1110}
1111
1112int count_parents(struct commit * commit)
1113{
1114        int count;
1115        struct commit_list * parents = commit->parents;
1116        for (count = 0; parents; parents = parents->next,count++)
1117                ;
1118        return count;
1119}
1120
1121void topo_sort_default_setter(struct commit *c, void *data)
1122{
1123        c->util = data;
1124}
1125
1126void *topo_sort_default_getter(struct commit *c)
1127{
1128        return c->util;
1129}
1130
1131/*
1132 * Performs an in-place topological sort on the list supplied.
1133 */
1134void sort_in_topological_order(struct commit_list ** list, int lifo)
1135{
1136        sort_in_topological_order_fn(list, lifo, topo_sort_default_setter,
1137                                     topo_sort_default_getter);
1138}
1139
1140void sort_in_topological_order_fn(struct commit_list ** list, int lifo,
1141                                  topo_sort_set_fn_t setter,
1142                                  topo_sort_get_fn_t getter)
1143{
1144        struct commit_list * next = *list;
1145        struct commit_list * work = NULL, **insert;
1146        struct commit_list ** pptr = list;
1147        struct sort_node * nodes;
1148        struct sort_node * next_nodes;
1149        int count = 0;
1150
1151        /* determine the size of the list */
1152        while (next) {
1153                next = next->next;
1154                count++;
1155        }
1156        
1157        if (!count)
1158                return;
1159        /* allocate an array to help sort the list */
1160        nodes = xcalloc(count, sizeof(*nodes));
1161        /* link the list to the array */
1162        next_nodes = nodes;
1163        next=*list;
1164        while (next) {
1165                next_nodes->list_item = next;
1166                setter(next->item, next_nodes);
1167                next_nodes++;
1168                next = next->next;
1169        }
1170        /* update the indegree */
1171        next=*list;
1172        while (next) {
1173                struct commit_list * parents = next->item->parents;
1174                while (parents) {
1175                        struct commit * parent=parents->item;
1176                        struct sort_node * pn = (struct sort_node *) getter(parent);
1177
1178                        if (pn)
1179                                pn->indegree++;
1180                        parents=parents->next;
1181                }
1182                next=next->next;
1183        }
1184        /* 
1185         * find the tips
1186         *
1187         * tips are nodes not reachable from any other node in the list 
1188         * 
1189         * the tips serve as a starting set for the work queue.
1190         */
1191        next=*list;
1192        insert = &work;
1193        while (next) {
1194                struct sort_node * node = (struct sort_node *) getter(next->item);
1195
1196                if (node->indegree == 0) {
1197                        insert = &commit_list_insert(next->item, insert)->next;
1198                }
1199                next=next->next;
1200        }
1201
1202        /* process the list in topological order */
1203        if (!lifo)
1204                sort_by_date(&work);
1205        while (work) {
1206                struct commit * work_item = pop_commit(&work);
1207                struct sort_node * work_node = (struct sort_node *) getter(work_item);
1208                struct commit_list * parents = work_item->parents;
1209
1210                while (parents) {
1211                        struct commit * parent=parents->item;
1212                        struct sort_node * pn = (struct sort_node *) getter(parent);
1213
1214                        if (pn) {
1215                                /*
1216                                 * parents are only enqueued for emission 
1217                                 * when all their children have been emitted thereby
1218                                 * guaranteeing topological order.
1219                                 */
1220                                pn->indegree--;
1221                                if (!pn->indegree) {
1222                                        if (!lifo)
1223                                                insert_by_date(parent, &work);
1224                                        else
1225                                                commit_list_insert(parent, &work);
1226                                }
1227                        }
1228                        parents=parents->next;
1229                }
1230                /*
1231                 * work_item is a commit all of whose children
1232                 * have already been emitted. we can emit it now.
1233                 */
1234                *pptr = work_node->list_item;
1235                pptr = &(*pptr)->next;
1236                *pptr = NULL;
1237                setter(work_item, NULL);
1238        }
1239        free(nodes);
1240}
1241
1242/* merge-base stuff */
1243
1244/* bits #0..15 in revision.h */
1245#define PARENT1         (1u<<16)
1246#define PARENT2         (1u<<17)
1247#define STALE           (1u<<18)
1248#define RESULT          (1u<<19)
1249
1250static const unsigned all_flags = (PARENT1 | PARENT2 | STALE | RESULT);
1251
1252static struct commit *interesting(struct commit_list *list)
1253{
1254        while (list) {
1255                struct commit *commit = list->item;
1256                list = list->next;
1257                if (commit->object.flags & STALE)
1258                        continue;
1259                return commit;
1260        }
1261        return NULL;
1262}
1263
1264static struct commit_list *merge_bases(struct commit *one, struct commit *two)
1265{
1266        struct commit_list *list = NULL;
1267        struct commit_list *result = NULL;
1268
1269        if (one == two)
1270                /* We do not mark this even with RESULT so we do not
1271                 * have to clean it up.
1272                 */
1273                return commit_list_insert(one, &result);
1274
1275        parse_commit(one);
1276        parse_commit(two);
1277
1278        one->object.flags |= PARENT1;
1279        two->object.flags |= PARENT2;
1280        insert_by_date(one, &list);
1281        insert_by_date(two, &list);
1282
1283        while (interesting(list)) {
1284                struct commit *commit;
1285                struct commit_list *parents;
1286                struct commit_list *n;
1287                int flags;
1288
1289                commit = list->item;
1290                n = list->next;
1291                free(list);
1292                list = n;
1293
1294                flags = commit->object.flags & (PARENT1 | PARENT2 | STALE);
1295                if (flags == (PARENT1 | PARENT2)) {
1296                        if (!(commit->object.flags & RESULT)) {
1297                                commit->object.flags |= RESULT;
1298                                insert_by_date(commit, &result);
1299                        }
1300                        /* Mark parents of a found merge stale */
1301                        flags |= STALE;
1302                }
1303                parents = commit->parents;
1304                while (parents) {
1305                        struct commit *p = parents->item;
1306                        parents = parents->next;
1307                        if ((p->object.flags & flags) == flags)
1308                                continue;
1309                        parse_commit(p);
1310                        p->object.flags |= flags;
1311                        insert_by_date(p, &list);
1312                }
1313        }
1314
1315        /* Clean up the result to remove stale ones */
1316        free_commit_list(list);
1317        list = result; result = NULL;
1318        while (list) {
1319                struct commit_list *n = list->next;
1320                if (!(list->item->object.flags & STALE))
1321                        insert_by_date(list->item, &result);
1322                free(list);
1323                list = n;
1324        }
1325        return result;
1326}
1327
1328struct commit_list *get_merge_bases(struct commit *one,
1329                                    struct commit *two,
1330                                    int cleanup)
1331{
1332        struct commit_list *list;
1333        struct commit **rslt;
1334        struct commit_list *result;
1335        int cnt, i, j;
1336
1337        result = merge_bases(one, two);
1338        if (one == two)
1339                return result;
1340        if (!result || !result->next) {
1341                if (cleanup) {
1342                        clear_commit_marks(one, all_flags);
1343                        clear_commit_marks(two, all_flags);
1344                }
1345                return result;
1346        }
1347
1348        /* There are more than one */
1349        cnt = 0;
1350        list = result;
1351        while (list) {
1352                list = list->next;
1353                cnt++;
1354        }
1355        rslt = xcalloc(cnt, sizeof(*rslt));
1356        for (list = result, i = 0; list; list = list->next)
1357                rslt[i++] = list->item;
1358        free_commit_list(result);
1359
1360        clear_commit_marks(one, all_flags);
1361        clear_commit_marks(two, all_flags);
1362        for (i = 0; i < cnt - 1; i++) {
1363                for (j = i+1; j < cnt; j++) {
1364                        if (!rslt[i] || !rslt[j])
1365                                continue;
1366                        result = merge_bases(rslt[i], rslt[j]);
1367                        clear_commit_marks(rslt[i], all_flags);
1368                        clear_commit_marks(rslt[j], all_flags);
1369                        for (list = result; list; list = list->next) {
1370                                if (rslt[i] == list->item)
1371                                        rslt[i] = NULL;
1372                                if (rslt[j] == list->item)
1373                                        rslt[j] = NULL;
1374                        }
1375                }
1376        }
1377
1378        /* Surviving ones in rslt[] are the independent results */
1379        result = NULL;
1380        for (i = 0; i < cnt; i++) {
1381                if (rslt[i])
1382                        insert_by_date(rslt[i], &result);
1383        }
1384        free(rslt);
1385        return result;
1386}
1387
1388int in_merge_bases(struct commit *commit, struct commit **reference, int num)
1389{
1390        struct commit_list *bases, *b;
1391        int ret = 0;
1392
1393        if (num == 1)
1394                bases = get_merge_bases(commit, *reference, 1);
1395        else
1396                die("not yet");
1397        for (b = bases; b; b = b->next) {
1398                if (!hashcmp(commit->object.sha1, b->item->object.sha1)) {
1399                        ret = 1;
1400                        break;
1401                }
1402        }
1403
1404        free_commit_list(bases);
1405        return ret;
1406}