Andrew's git / gitweb.git / commit.c
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commit.con commit Support cvs via git-shell (0c696fe)
   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)
 462{
 463        int ret = 0;
 464
 465        for (;;) {
 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 void add_rfc2047(struct strbuf *sb, const char *line, int len,
 489                       const char *encoding)
 490{
 491        int i, last;
 492
 493        for (i = 0; i < len; i++) {
 494                int ch = line[i];
 495                if (non_ascii(ch))
 496                        goto needquote;
 497                if ((i + 1 < len) && (ch == '=' && line[i+1] == '?'))
 498                        goto needquote;
 499        }
 500        strbuf_add(sb, line, len);
 501        return;
 502
 503needquote:
 504        strbuf_grow(sb, len * 3 + strlen(encoding) + 100);
 505        strbuf_addf(sb, "=?%s?q?", encoding);
 506        for (i = last = 0; i < len; i++) {
 507                unsigned ch = line[i] & 0xFF;
 508                /*
 509                 * We encode ' ' using '=20' even though rfc2047
 510                 * allows using '_' for readability.  Unfortunately,
 511                 * many programs do not understand this and just
 512                 * leave the underscore in place.
 513                 */
 514                if (is_rfc2047_special(ch) || ch == ' ') {
 515                        strbuf_add(sb, line + last, i - last);
 516                        strbuf_addf(sb, "=%02X", ch);
 517                        last = i + 1;
 518                }
 519        }
 520        strbuf_add(sb, line + last, len - last);
 521        strbuf_addstr(sb, "?=");
 522}
 523
 524static void add_user_info(const char *what, enum cmit_fmt fmt, struct strbuf *sb,
 525                         const char *line, enum date_mode dmode,
 526                         const char *encoding)
 527{
 528        char *date;
 529        int namelen;
 530        unsigned long time;
 531        int tz;
 532        const char *filler = "    ";
 533
 534        if (fmt == CMIT_FMT_ONELINE)
 535                return;
 536        date = strchr(line, '>');
 537        if (!date)
 538                return;
 539        namelen = ++date - line;
 540        time = strtoul(date, &date, 10);
 541        tz = strtol(date, NULL, 10);
 542
 543        if (fmt == CMIT_FMT_EMAIL) {
 544                char *name_tail = strchr(line, '<');
 545                int display_name_length;
 546                if (!name_tail)
 547                        return;
 548                while (line < name_tail && isspace(name_tail[-1]))
 549                        name_tail--;
 550                display_name_length = name_tail - line;
 551                filler = "";
 552                strbuf_addstr(sb, "From: ");
 553                add_rfc2047(sb, line, display_name_length, encoding);
 554                strbuf_add(sb, name_tail, namelen - display_name_length);
 555                strbuf_addch(sb, '\n');
 556        } else {
 557                strbuf_addf(sb, "%s: %.*s%.*s\n", what,
 558                              (fmt == CMIT_FMT_FULLER) ? 4 : 0,
 559                              filler, namelen, line);
 560        }
 561        switch (fmt) {
 562        case CMIT_FMT_MEDIUM:
 563                strbuf_addf(sb, "Date:   %s\n", show_date(time, tz, dmode));
 564                break;
 565        case CMIT_FMT_EMAIL:
 566                strbuf_addf(sb, "Date: %s\n", show_date(time, tz, DATE_RFC2822));
 567                break;
 568        case CMIT_FMT_FULLER:
 569                strbuf_addf(sb, "%sDate: %s\n", what, show_date(time, tz, dmode));
 570                break;
 571        default:
 572                /* notin' */
 573                break;
 574        }
 575}
 576
 577static int is_empty_line(const char *line, int *len_p)
 578{
 579        int len = *len_p;
 580        while (len && isspace(line[len-1]))
 581                len--;
 582        *len_p = len;
 583        return !len;
 584}
 585
 586static void add_merge_info(enum cmit_fmt fmt, struct strbuf *sb,
 587                        const struct commit *commit, int abbrev)
 588{
 589        struct commit_list *parent = commit->parents;
 590
 591        if ((fmt == CMIT_FMT_ONELINE) || (fmt == CMIT_FMT_EMAIL) ||
 592            !parent || !parent->next)
 593                return;
 594
 595        strbuf_addstr(sb, "Merge:");
 596
 597        while (parent) {
 598                struct commit *p = parent->item;
 599                const char *hex = NULL;
 600                const char *dots;
 601                if (abbrev)
 602                        hex = find_unique_abbrev(p->object.sha1, abbrev);
 603                if (!hex)
 604                        hex = sha1_to_hex(p->object.sha1);
 605                dots = (abbrev && strlen(hex) != 40) ?  "..." : "";
 606                parent = parent->next;
 607
 608                strbuf_addf(sb, " %s%s", hex, dots);
 609        }
 610        strbuf_addch(sb, '\n');
 611}
 612
 613static char *get_header(const struct commit *commit, const char *key)
 614{
 615        int key_len = strlen(key);
 616        const char *line = commit->buffer;
 617
 618        for (;;) {
 619                const char *eol = strchr(line, '\n'), *next;
 620
 621                if (line == eol)
 622                        return NULL;
 623                if (!eol) {
 624                        eol = line + strlen(line);
 625                        next = NULL;
 626                } else
 627                        next = eol + 1;
 628                if (eol - line > key_len &&
 629                    !strncmp(line, key, key_len) &&
 630                    line[key_len] == ' ') {
 631                        return xmemdupz(line + key_len + 1, eol - line - key_len - 1);
 632                }
 633                line = next;
 634        }
 635}
 636
 637static char *replace_encoding_header(char *buf, const char *encoding)
 638{
 639        struct strbuf tmp;
 640        size_t start, len;
 641        char *cp = buf;
 642
 643        /* guess if there is an encoding header before a \n\n */
 644        while (strncmp(cp, "encoding ", strlen("encoding "))) {
 645                cp = strchr(cp, '\n');
 646                if (!cp || *++cp == '\n')
 647                        return buf;
 648        }
 649        start = cp - buf;
 650        cp = strchr(cp, '\n');
 651        if (!cp)
 652                return buf; /* should not happen but be defensive */
 653        len = cp + 1 - (buf + start);
 654
 655        strbuf_init(&tmp, 0);
 656        strbuf_attach(&tmp, buf, strlen(buf), strlen(buf) + 1);
 657        if (is_encoding_utf8(encoding)) {
 658                /* we have re-coded to UTF-8; drop the header */
 659                strbuf_remove(&tmp, start, len);
 660        } else {
 661                /* just replaces XXXX in 'encoding XXXX\n' */
 662                strbuf_splice(&tmp, start + strlen("encoding "),
 663                                          len - strlen("encoding \n"),
 664                                          encoding, strlen(encoding));
 665        }
 666        return strbuf_detach(&tmp, NULL);
 667}
 668
 669static char *logmsg_reencode(const struct commit *commit,
 670                             const char *output_encoding)
 671{
 672        static const char *utf8 = "utf-8";
 673        const char *use_encoding;
 674        char *encoding;
 675        char *out;
 676
 677        if (!*output_encoding)
 678                return NULL;
 679        encoding = get_header(commit, "encoding");
 680        use_encoding = encoding ? encoding : utf8;
 681        if (!strcmp(use_encoding, output_encoding))
 682                if (encoding) /* we'll strip encoding header later */
 683                        out = xstrdup(commit->buffer);
 684                else
 685                        return NULL; /* nothing to do */
 686        else
 687                out = reencode_string(commit->buffer,
 688                                      output_encoding, use_encoding);
 689        if (out)
 690                out = replace_encoding_header(out, output_encoding);
 691
 692        free(encoding);
 693        return out;
 694}
 695
 696static void fill_person(struct interp *table, const char *msg, int len)
 697{
 698        int start, end, tz = 0;
 699        unsigned long date;
 700        char *ep;
 701
 702        /* parse name */
 703        for (end = 0; end < len && msg[end] != '<'; end++)
 704                ; /* do nothing */
 705        start = end + 1;
 706        while (end > 0 && isspace(msg[end - 1]))
 707                end--;
 708        table[0].value = xmemdupz(msg, end);
 709
 710        if (start >= len)
 711                return;
 712
 713        /* parse email */
 714        for (end = start + 1; end < len && msg[end] != '>'; end++)
 715                ; /* do nothing */
 716
 717        if (end >= len)
 718                return;
 719
 720        table[1].value = xmemdupz(msg + start, end - start);
 721
 722        /* parse date */
 723        for (start = end + 1; start < len && isspace(msg[start]); start++)
 724                ; /* do nothing */
 725        if (start >= len)
 726                return;
 727        date = strtoul(msg + start, &ep, 10);
 728        if (msg + start == ep)
 729                return;
 730
 731        table[5].value = xmemdupz(msg + start, ep - (msg + start));
 732
 733        /* parse tz */
 734        for (start = ep - msg + 1; start < len && isspace(msg[start]); start++)
 735                ; /* do nothing */
 736        if (start + 1 < len) {
 737                tz = strtoul(msg + start + 1, NULL, 10);
 738                if (msg[start] == '-')
 739                        tz = -tz;
 740        }
 741
 742        interp_set_entry(table, 2, show_date(date, tz, DATE_NORMAL));
 743        interp_set_entry(table, 3, show_date(date, tz, DATE_RFC2822));
 744        interp_set_entry(table, 4, show_date(date, tz, DATE_RELATIVE));
 745        interp_set_entry(table, 6, show_date(date, tz, DATE_ISO8601));
 746}
 747
 748void format_commit_message(const struct commit *commit,
 749                           const void *format, struct strbuf *sb)
 750{
 751        struct interp table[] = {
 752                { "%H" },       /* commit hash */
 753                { "%h" },       /* abbreviated commit hash */
 754                { "%T" },       /* tree hash */
 755                { "%t" },       /* abbreviated tree hash */
 756                { "%P" },       /* parent hashes */
 757                { "%p" },       /* abbreviated parent hashes */
 758                { "%an" },      /* author name */
 759                { "%ae" },      /* author email */
 760                { "%ad" },      /* author date */
 761                { "%aD" },      /* author date, RFC2822 style */
 762                { "%ar" },      /* author date, relative */
 763                { "%at" },      /* author date, UNIX timestamp */
 764                { "%ai" },      /* author date, ISO 8601 */
 765                { "%cn" },      /* committer name */
 766                { "%ce" },      /* committer email */
 767                { "%cd" },      /* committer date */
 768                { "%cD" },      /* committer date, RFC2822 style */
 769                { "%cr" },      /* committer date, relative */
 770                { "%ct" },      /* committer date, UNIX timestamp */
 771                { "%ci" },      /* committer date, ISO 8601 */
 772                { "%e" },       /* encoding */
 773                { "%s" },       /* subject */
 774                { "%b" },       /* body */
 775                { "%Cred" },    /* red */
 776                { "%Cgreen" },  /* green */
 777                { "%Cblue" },   /* blue */
 778                { "%Creset" },  /* reset color */
 779                { "%n" },       /* newline */
 780                { "%m" },       /* left/right/bottom */
 781        };
 782        enum interp_index {
 783                IHASH = 0, IHASH_ABBREV,
 784                ITREE, ITREE_ABBREV,
 785                IPARENTS, IPARENTS_ABBREV,
 786                IAUTHOR_NAME, IAUTHOR_EMAIL,
 787                IAUTHOR_DATE, IAUTHOR_DATE_RFC2822, IAUTHOR_DATE_RELATIVE,
 788                IAUTHOR_TIMESTAMP, IAUTHOR_ISO8601,
 789                ICOMMITTER_NAME, ICOMMITTER_EMAIL,
 790                ICOMMITTER_DATE, ICOMMITTER_DATE_RFC2822,
 791                ICOMMITTER_DATE_RELATIVE, ICOMMITTER_TIMESTAMP,
 792                ICOMMITTER_ISO8601,
 793                IENCODING,
 794                ISUBJECT,
 795                IBODY,
 796                IRED, IGREEN, IBLUE, IRESET_COLOR,
 797                INEWLINE,
 798                ILEFT_RIGHT,
 799        };
 800        struct commit_list *p;
 801        char parents[1024];
 802        unsigned long len;
 803        int i;
 804        enum { HEADER, SUBJECT, BODY } state;
 805        const char *msg = commit->buffer;
 806
 807        if (ILEFT_RIGHT + 1 != ARRAY_SIZE(table))
 808                die("invalid interp table!");
 809
 810        /* these are independent of the commit */
 811        interp_set_entry(table, IRED, "\033[31m");
 812        interp_set_entry(table, IGREEN, "\033[32m");
 813        interp_set_entry(table, IBLUE, "\033[34m");
 814        interp_set_entry(table, IRESET_COLOR, "\033[m");
 815        interp_set_entry(table, INEWLINE, "\n");
 816
 817        /* these depend on the commit */
 818        if (!commit->object.parsed)
 819                parse_object(commit->object.sha1);
 820        interp_set_entry(table, IHASH, sha1_to_hex(commit->object.sha1));
 821        interp_set_entry(table, IHASH_ABBREV,
 822                        find_unique_abbrev(commit->object.sha1,
 823                                DEFAULT_ABBREV));
 824        interp_set_entry(table, ITREE, sha1_to_hex(commit->tree->object.sha1));
 825        interp_set_entry(table, ITREE_ABBREV,
 826                        find_unique_abbrev(commit->tree->object.sha1,
 827                                DEFAULT_ABBREV));
 828        interp_set_entry(table, ILEFT_RIGHT,
 829                         (commit->object.flags & BOUNDARY)
 830                         ? "-"
 831                         : (commit->object.flags & SYMMETRIC_LEFT)
 832                         ? "<"
 833                         : ">");
 834
 835        parents[1] = 0;
 836        for (i = 0, p = commit->parents;
 837                        p && i < sizeof(parents) - 1;
 838                        p = p->next)
 839                i += snprintf(parents + i, sizeof(parents) - i - 1, " %s",
 840                        sha1_to_hex(p->item->object.sha1));
 841        interp_set_entry(table, IPARENTS, parents + 1);
 842
 843        parents[1] = 0;
 844        for (i = 0, p = commit->parents;
 845                        p && i < sizeof(parents) - 1;
 846                        p = p->next)
 847                i += snprintf(parents + i, sizeof(parents) - i - 1, " %s",
 848                        find_unique_abbrev(p->item->object.sha1,
 849                                DEFAULT_ABBREV));
 850        interp_set_entry(table, IPARENTS_ABBREV, parents + 1);
 851
 852        for (i = 0, state = HEADER; msg[i] && state < BODY; i++) {
 853                int eol;
 854                for (eol = i; msg[eol] && msg[eol] != '\n'; eol++)
 855                        ; /* do nothing */
 856
 857                if (state == SUBJECT) {
 858                        table[ISUBJECT].value = xmemdupz(msg + i, eol - i);
 859                        i = eol;
 860                }
 861                if (i == eol) {
 862                        state++;
 863                        /* strip empty lines */
 864                        while (msg[eol + 1] == '\n')
 865                                eol++;
 866                } else if (!prefixcmp(msg + i, "author "))
 867                        fill_person(table + IAUTHOR_NAME,
 868                                        msg + i + 7, eol - i - 7);
 869                else if (!prefixcmp(msg + i, "committer "))
 870                        fill_person(table + ICOMMITTER_NAME,
 871                                        msg + i + 10, eol - i - 10);
 872                else if (!prefixcmp(msg + i, "encoding "))
 873                        table[IENCODING].value =
 874                                xmemdupz(msg + i + 9, eol - i - 9);
 875                i = eol;
 876        }
 877        if (msg[i])
 878                table[IBODY].value = xstrdup(msg + i);
 879
 880        len = interpolate(sb->buf + sb->len, strbuf_avail(sb),
 881                                format, table, ARRAY_SIZE(table));
 882        if (len > strbuf_avail(sb)) {
 883                strbuf_grow(sb, len);
 884                interpolate(sb->buf + sb->len, strbuf_avail(sb) + 1,
 885                                        format, table, ARRAY_SIZE(table));
 886        }
 887        strbuf_setlen(sb, sb->len + len);
 888        interp_clear_table(table, ARRAY_SIZE(table));
 889}
 890
 891static void pp_header(enum cmit_fmt fmt,
 892                      int abbrev,
 893                      enum date_mode dmode,
 894                      const char *encoding,
 895                      const struct commit *commit,
 896                      const char **msg_p,
 897                      struct strbuf *sb)
 898{
 899        int parents_shown = 0;
 900
 901        for (;;) {
 902                const char *line = *msg_p;
 903                int linelen = get_one_line(*msg_p);
 904
 905                if (!linelen)
 906                        return;
 907                *msg_p += linelen;
 908
 909                if (linelen == 1)
 910                        /* End of header */
 911                        return;
 912
 913                if (fmt == CMIT_FMT_RAW) {
 914                        strbuf_add(sb, line, linelen);
 915                        continue;
 916                }
 917
 918                if (!memcmp(line, "parent ", 7)) {
 919                        if (linelen != 48)
 920                                die("bad parent line in commit");
 921                        continue;
 922                }
 923
 924                if (!parents_shown) {
 925                        struct commit_list *parent;
 926                        int num;
 927                        for (parent = commit->parents, num = 0;
 928                             parent;
 929                             parent = parent->next, num++)
 930                                ;
 931                        /* with enough slop */
 932                        strbuf_grow(sb, num * 50 + 20);
 933                        add_merge_info(fmt, sb, commit, abbrev);
 934                        parents_shown = 1;
 935                }
 936
 937                /*
 938                 * MEDIUM == DEFAULT shows only author with dates.
 939                 * FULL shows both authors but not dates.
 940                 * FULLER shows both authors and dates.
 941                 */
 942                if (!memcmp(line, "author ", 7)) {
 943                        strbuf_grow(sb, linelen + 80);
 944                        add_user_info("Author", fmt, sb, line + 7, dmode, encoding);
 945                }
 946                if (!memcmp(line, "committer ", 10) &&
 947                    (fmt == CMIT_FMT_FULL || fmt == CMIT_FMT_FULLER)) {
 948                        strbuf_grow(sb, linelen + 80);
 949                        add_user_info("Commit", fmt, sb, line + 10, dmode, encoding);
 950                }
 951        }
 952}
 953
 954static void pp_title_line(enum cmit_fmt fmt,
 955                          const char **msg_p,
 956                          struct strbuf *sb,
 957                          const char *subject,
 958                          const char *after_subject,
 959                          const char *encoding,
 960                          int plain_non_ascii)
 961{
 962        struct strbuf title;
 963
 964        strbuf_init(&title, 80);
 965
 966        for (;;) {
 967                const char *line = *msg_p;
 968                int linelen = get_one_line(line);
 969
 970                *msg_p += linelen;
 971                if (!linelen || is_empty_line(line, &linelen))
 972                        break;
 973
 974                strbuf_grow(&title, linelen + 2);
 975                if (title.len) {
 976                        if (fmt == CMIT_FMT_EMAIL) {
 977                                strbuf_addch(&title, '\n');
 978                        }
 979                        strbuf_addch(&title, ' ');
 980                }
 981                strbuf_add(&title, line, linelen);
 982        }
 983
 984        strbuf_grow(sb, title.len + 1024);
 985        if (subject) {
 986                strbuf_addstr(sb, subject);
 987                add_rfc2047(sb, title.buf, title.len, encoding);
 988        } else {
 989                strbuf_addbuf(sb, &title);
 990        }
 991        strbuf_addch(sb, '\n');
 992
 993        if (plain_non_ascii) {
 994                const char *header_fmt =
 995                        "MIME-Version: 1.0\n"
 996                        "Content-Type: text/plain; charset=%s\n"
 997                        "Content-Transfer-Encoding: 8bit\n";
 998                strbuf_addf(sb, header_fmt, encoding);
 999        }
1000        if (after_subject) {
1001                strbuf_addstr(sb, after_subject);
1002        }
1003        if (fmt == CMIT_FMT_EMAIL) {
1004                strbuf_addch(sb, '\n');
1005        }
1006        strbuf_release(&title);
1007}
1008
1009static void pp_remainder(enum cmit_fmt fmt,
1010                         const char **msg_p,
1011                         struct strbuf *sb,
1012                         int indent)
1013{
1014        int first = 1;
1015        for (;;) {
1016                const char *line = *msg_p;
1017                int linelen = get_one_line(line);
1018                *msg_p += linelen;
1019
1020                if (!linelen)
1021                        break;
1022
1023                if (is_empty_line(line, &linelen)) {
1024                        if (first)
1025                                continue;
1026                        if (fmt == CMIT_FMT_SHORT)
1027                                break;
1028                }
1029                first = 0;
1030
1031                strbuf_grow(sb, linelen + indent + 20);
1032                if (indent) {
1033                        memset(sb->buf + sb->len, ' ', indent);
1034                        strbuf_setlen(sb, sb->len + indent);
1035                }
1036                strbuf_add(sb, line, linelen);
1037                strbuf_addch(sb, '\n');
1038        }
1039}
1040
1041void pretty_print_commit(enum cmit_fmt fmt, const struct commit *commit,
1042                                  struct strbuf *sb, int abbrev,
1043                                  const char *subject, const char *after_subject,
1044                                  enum date_mode dmode)
1045{
1046        unsigned long beginning_of_body;
1047        int indent = 4;
1048        const char *msg = commit->buffer;
1049        int plain_non_ascii = 0;
1050        char *reencoded;
1051        const char *encoding;
1052
1053        if (fmt == CMIT_FMT_USERFORMAT) {
1054                format_commit_message(commit, user_format, sb);
1055                return;
1056        }
1057
1058        encoding = (git_log_output_encoding
1059                    ? git_log_output_encoding
1060                    : git_commit_encoding);
1061        if (!encoding)
1062                encoding = "utf-8";
1063        reencoded = logmsg_reencode(commit, encoding);
1064        if (reencoded) {
1065                msg = reencoded;
1066        }
1067
1068        if (fmt == CMIT_FMT_ONELINE || fmt == CMIT_FMT_EMAIL)
1069                indent = 0;
1070
1071        /* After-subject is used to pass in Content-Type: multipart
1072         * MIME header; in that case we do not have to do the
1073         * plaintext content type even if the commit message has
1074         * non 7-bit ASCII character.  Otherwise, check if we need
1075         * to say this is not a 7-bit ASCII.
1076         */
1077        if (fmt == CMIT_FMT_EMAIL && !after_subject) {
1078                int i, ch, in_body;
1079
1080                for (in_body = i = 0; (ch = msg[i]); i++) {
1081                        if (!in_body) {
1082                                /* author could be non 7-bit ASCII but
1083                                 * the log may be so; skip over the
1084                                 * header part first.
1085                                 */
1086                                if (ch == '\n' && msg[i+1] == '\n')
1087                                        in_body = 1;
1088                        }
1089                        else if (non_ascii(ch)) {
1090                                plain_non_ascii = 1;
1091                                break;
1092                        }
1093                }
1094        }
1095
1096        pp_header(fmt, abbrev, dmode, encoding, commit, &msg, sb);
1097        if (fmt != CMIT_FMT_ONELINE && !subject) {
1098                strbuf_addch(sb, '\n');
1099        }
1100
1101        /* Skip excess blank lines at the beginning of body, if any... */
1102        for (;;) {
1103                int linelen = get_one_line(msg);
1104                int ll = linelen;
1105                if (!linelen)
1106                        break;
1107                if (!is_empty_line(msg, &ll))
1108                        break;
1109                msg += linelen;
1110        }
1111
1112        /* These formats treat the title line specially. */
1113        if (fmt == CMIT_FMT_ONELINE || fmt == CMIT_FMT_EMAIL)
1114                pp_title_line(fmt, &msg, sb, subject,
1115                              after_subject, encoding, plain_non_ascii);
1116
1117        beginning_of_body = sb->len;
1118        if (fmt != CMIT_FMT_ONELINE)
1119                pp_remainder(fmt, &msg, sb, indent);
1120        strbuf_rtrim(sb);
1121
1122        /* Make sure there is an EOLN for the non-oneline case */
1123        if (fmt != CMIT_FMT_ONELINE)
1124                strbuf_addch(sb, '\n');
1125
1126        /*
1127         * The caller may append additional body text in e-mail
1128         * format.  Make sure we did not strip the blank line
1129         * between the header and the body.
1130         */
1131        if (fmt == CMIT_FMT_EMAIL && sb->len <= beginning_of_body)
1132                strbuf_addch(sb, '\n');
1133        free(reencoded);
1134}
1135
1136struct commit *pop_commit(struct commit_list **stack)
1137{
1138        struct commit_list *top = *stack;
1139        struct commit *item = top ? top->item : NULL;
1140
1141        if (top) {
1142                *stack = top->next;
1143                free(top);
1144        }
1145        return item;
1146}
1147
1148void topo_sort_default_setter(struct commit *c, void *data)
1149{
1150        c->util = data;
1151}
1152
1153void *topo_sort_default_getter(struct commit *c)
1154{
1155        return c->util;
1156}
1157
1158/*
1159 * Performs an in-place topological sort on the list supplied.
1160 */
1161void sort_in_topological_order(struct commit_list ** list, int lifo)
1162{
1163        sort_in_topological_order_fn(list, lifo, topo_sort_default_setter,
1164                                     topo_sort_default_getter);
1165}
1166
1167void sort_in_topological_order_fn(struct commit_list ** list, int lifo,
1168                                  topo_sort_set_fn_t setter,
1169                                  topo_sort_get_fn_t getter)
1170{
1171        struct commit_list * next = *list;
1172        struct commit_list * work = NULL, **insert;
1173        struct commit_list ** pptr = list;
1174        struct sort_node * nodes;
1175        struct sort_node * next_nodes;
1176        int count = 0;
1177
1178        /* determine the size of the list */
1179        while (next) {
1180                next = next->next;
1181                count++;
1182        }
1183
1184        if (!count)
1185                return;
1186        /* allocate an array to help sort the list */
1187        nodes = xcalloc(count, sizeof(*nodes));
1188        /* link the list to the array */
1189        next_nodes = nodes;
1190        next=*list;
1191        while (next) {
1192                next_nodes->list_item = next;
1193                setter(next->item, next_nodes);
1194                next_nodes++;
1195                next = next->next;
1196        }
1197        /* update the indegree */
1198        next=*list;
1199        while (next) {
1200                struct commit_list * parents = next->item->parents;
1201                while (parents) {
1202                        struct commit * parent=parents->item;
1203                        struct sort_node * pn = (struct sort_node *) getter(parent);
1204
1205                        if (pn)
1206                                pn->indegree++;
1207                        parents=parents->next;
1208                }
1209                next=next->next;
1210        }
1211        /*
1212         * find the tips
1213         *
1214         * tips are nodes not reachable from any other node in the list
1215         *
1216         * the tips serve as a starting set for the work queue.
1217         */
1218        next=*list;
1219        insert = &work;
1220        while (next) {
1221                struct sort_node * node = (struct sort_node *) getter(next->item);
1222
1223                if (node->indegree == 0) {
1224                        insert = &commit_list_insert(next->item, insert)->next;
1225                }
1226                next=next->next;
1227        }
1228
1229        /* process the list in topological order */
1230        if (!lifo)
1231                sort_by_date(&work);
1232        while (work) {
1233                struct commit * work_item = pop_commit(&work);
1234                struct sort_node * work_node = (struct sort_node *) getter(work_item);
1235                struct commit_list * parents = work_item->parents;
1236
1237                while (parents) {
1238                        struct commit * parent=parents->item;
1239                        struct sort_node * pn = (struct sort_node *) getter(parent);
1240
1241                        if (pn) {
1242                                /*
1243                                 * parents are only enqueued for emission
1244                                 * when all their children have been emitted thereby
1245                                 * guaranteeing topological order.
1246                                 */
1247                                pn->indegree--;
1248                                if (!pn->indegree) {
1249                                        if (!lifo)
1250                                                insert_by_date(parent, &work);
1251                                        else
1252                                                commit_list_insert(parent, &work);
1253                                }
1254                        }
1255                        parents=parents->next;
1256                }
1257                /*
1258                 * work_item is a commit all of whose children
1259                 * have already been emitted. we can emit it now.
1260                 */
1261                *pptr = work_node->list_item;
1262                pptr = &(*pptr)->next;
1263                *pptr = NULL;
1264                setter(work_item, NULL);
1265        }
1266        free(nodes);
1267}
1268
1269/* merge-base stuff */
1270
1271/* bits #0..15 in revision.h */
1272#define PARENT1         (1u<<16)
1273#define PARENT2         (1u<<17)
1274#define STALE           (1u<<18)
1275#define RESULT          (1u<<19)
1276
1277static const unsigned all_flags = (PARENT1 | PARENT2 | STALE | RESULT);
1278
1279static struct commit *interesting(struct commit_list *list)
1280{
1281        while (list) {
1282                struct commit *commit = list->item;
1283                list = list->next;
1284                if (commit->object.flags & STALE)
1285                        continue;
1286                return commit;
1287        }
1288        return NULL;
1289}
1290
1291static struct commit_list *merge_bases(struct commit *one, struct commit *two)
1292{
1293        struct commit_list *list = NULL;
1294        struct commit_list *result = NULL;
1295
1296        if (one == two)
1297                /* We do not mark this even with RESULT so we do not
1298                 * have to clean it up.
1299                 */
1300                return commit_list_insert(one, &result);
1301
1302        parse_commit(one);
1303        parse_commit(two);
1304
1305        one->object.flags |= PARENT1;
1306        two->object.flags |= PARENT2;
1307        insert_by_date(one, &list);
1308        insert_by_date(two, &list);
1309
1310        while (interesting(list)) {
1311                struct commit *commit;
1312                struct commit_list *parents;
1313                struct commit_list *n;
1314                int flags;
1315
1316                commit = list->item;
1317                n = list->next;
1318                free(list);
1319                list = n;
1320
1321                flags = commit->object.flags & (PARENT1 | PARENT2 | STALE);
1322                if (flags == (PARENT1 | PARENT2)) {
1323                        if (!(commit->object.flags & RESULT)) {
1324                                commit->object.flags |= RESULT;
1325                                insert_by_date(commit, &result);
1326                        }
1327                        /* Mark parents of a found merge stale */
1328                        flags |= STALE;
1329                }
1330                parents = commit->parents;
1331                while (parents) {
1332                        struct commit *p = parents->item;
1333                        parents = parents->next;
1334                        if ((p->object.flags & flags) == flags)
1335                                continue;
1336                        parse_commit(p);
1337                        p->object.flags |= flags;
1338                        insert_by_date(p, &list);
1339                }
1340        }
1341
1342        /* Clean up the result to remove stale ones */
1343        free_commit_list(list);
1344        list = result; result = NULL;
1345        while (list) {
1346                struct commit_list *n = list->next;
1347                if (!(list->item->object.flags & STALE))
1348                        insert_by_date(list->item, &result);
1349                free(list);
1350                list = n;
1351        }
1352        return result;
1353}
1354
1355struct commit_list *get_merge_bases(struct commit *one,
1356                                        struct commit *two, int cleanup)
1357{
1358        struct commit_list *list;
1359        struct commit **rslt;
1360        struct commit_list *result;
1361        int cnt, i, j;
1362
1363        result = merge_bases(one, two);
1364        if (one == two)
1365                return result;
1366        if (!result || !result->next) {
1367                if (cleanup) {
1368                        clear_commit_marks(one, all_flags);
1369                        clear_commit_marks(two, all_flags);
1370                }
1371                return result;
1372        }
1373
1374        /* There are more than one */
1375        cnt = 0;
1376        list = result;
1377        while (list) {
1378                list = list->next;
1379                cnt++;
1380        }
1381        rslt = xcalloc(cnt, sizeof(*rslt));
1382        for (list = result, i = 0; list; list = list->next)
1383                rslt[i++] = list->item;
1384        free_commit_list(result);
1385
1386        clear_commit_marks(one, all_flags);
1387        clear_commit_marks(two, all_flags);
1388        for (i = 0; i < cnt - 1; i++) {
1389                for (j = i+1; j < cnt; j++) {
1390                        if (!rslt[i] || !rslt[j])
1391                                continue;
1392                        result = merge_bases(rslt[i], rslt[j]);
1393                        clear_commit_marks(rslt[i], all_flags);
1394                        clear_commit_marks(rslt[j], all_flags);
1395                        for (list = result; list; list = list->next) {
1396                                if (rslt[i] == list->item)
1397                                        rslt[i] = NULL;
1398                                if (rslt[j] == list->item)
1399                                        rslt[j] = NULL;
1400                        }
1401                }
1402        }
1403
1404        /* Surviving ones in rslt[] are the independent results */
1405        result = NULL;
1406        for (i = 0; i < cnt; i++) {
1407                if (rslt[i])
1408                        insert_by_date(rslt[i], &result);
1409        }
1410        free(rslt);
1411        return result;
1412}
1413
1414int in_merge_bases(struct commit *commit, struct commit **reference, int num)
1415{
1416        struct commit_list *bases, *b;
1417        int ret = 0;
1418
1419        if (num == 1)
1420                bases = get_merge_bases(commit, *reference, 1);
1421        else
1422                die("not yet");
1423        for (b = bases; b; b = b->next) {
1424                if (!hashcmp(commit->object.sha1, b->item->object.sha1)) {
1425                        ret = 1;
1426                        break;
1427                }
1428        }
1429
1430        free_commit_list(bases);
1431        return ret;
1432}