Andrew's git / gitweb.git / commit.c
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commit.con commit read-tree: --prefix=<path>/ option. (f4c6f2d)
   1#include "cache.h"
   2#include "tag.h"
   3#include "commit.h"
   4
   5int save_commit_buffer = 1;
   6
   7struct sort_node
   8{
   9        /*
  10         * the number of children of the associated commit
  11         * that also occur in the list being sorted.
  12         */
  13        unsigned int indegree;
  14
  15        /*
  16         * reference to original list item that we will re-use
  17         * on output.
  18         */
  19        struct commit_list * list_item;
  20
  21};
  22
  23const char *commit_type = "commit";
  24
  25enum cmit_fmt get_commit_format(const char *arg)
  26{
  27        if (!*arg)
  28                return CMIT_FMT_DEFAULT;
  29        if (!strcmp(arg, "=raw"))
  30                return CMIT_FMT_RAW;
  31        if (!strcmp(arg, "=medium"))
  32                return CMIT_FMT_MEDIUM;
  33        if (!strcmp(arg, "=short"))
  34                return CMIT_FMT_SHORT;
  35        if (!strcmp(arg, "=full"))
  36                return CMIT_FMT_FULL;
  37        if (!strcmp(arg, "=fuller"))
  38                return CMIT_FMT_FULLER;
  39        if (!strcmp(arg, "=oneline"))
  40                return CMIT_FMT_ONELINE;
  41        die("invalid --pretty format");
  42}
  43
  44static struct commit *check_commit(struct object *obj,
  45                                   const unsigned char *sha1,
  46                                   int quiet)
  47{
  48        if (obj->type != commit_type) {
  49                if (!quiet)
  50                        error("Object %s is a %s, not a commit",
  51                              sha1_to_hex(sha1), obj->type);
  52                return NULL;
  53        }
  54        return (struct commit *) obj;
  55}
  56
  57struct commit *lookup_commit_reference_gently(const unsigned char *sha1,
  58                                              int quiet)
  59{
  60        struct object *obj = deref_tag(parse_object(sha1), NULL, 0);
  61
  62        if (!obj)
  63                return NULL;
  64        return check_commit(obj, sha1, quiet);
  65}
  66
  67struct commit *lookup_commit_reference(const unsigned char *sha1)
  68{
  69        return lookup_commit_reference_gently(sha1, 0);
  70}
  71
  72struct commit *lookup_commit(const unsigned char *sha1)
  73{
  74        struct object *obj = lookup_object(sha1);
  75        if (!obj) {
  76                struct commit *ret = xcalloc(1, sizeof(struct commit));
  77                created_object(sha1, &ret->object);
  78                ret->object.type = commit_type;
  79                return ret;
  80        }
  81        if (!obj->type)
  82                obj->type = commit_type;
  83        return check_commit(obj, sha1, 0);
  84}
  85
  86static unsigned long parse_commit_date(const char *buf)
  87{
  88        unsigned long date;
  89
  90        if (memcmp(buf, "author", 6))
  91                return 0;
  92        while (*buf++ != '\n')
  93                /* nada */;
  94        if (memcmp(buf, "committer", 9))
  95                return 0;
  96        while (*buf++ != '>')
  97                /* nada */;
  98        date = strtoul(buf, NULL, 10);
  99        if (date == ULONG_MAX)
 100                date = 0;
 101        return date;
 102}
 103
 104static struct commit_graft **commit_graft;
 105static int commit_graft_alloc, commit_graft_nr;
 106
 107static int commit_graft_pos(const unsigned char *sha1)
 108{
 109        int lo, hi;
 110        lo = 0;
 111        hi = commit_graft_nr;
 112        while (lo < hi) {
 113                int mi = (lo + hi) / 2;
 114                struct commit_graft *graft = commit_graft[mi];
 115                int cmp = memcmp(sha1, graft->sha1, 20);
 116                if (!cmp)
 117                        return mi;
 118                if (cmp < 0)
 119                        hi = mi;
 120                else
 121                        lo = mi + 1;
 122        }
 123        return -lo - 1;
 124}
 125
 126int register_commit_graft(struct commit_graft *graft, int ignore_dups)
 127{
 128        int pos = commit_graft_pos(graft->sha1);
 129        
 130        if (0 <= pos) {
 131                if (ignore_dups)
 132                        free(graft);
 133                else {
 134                        free(commit_graft[pos]);
 135                        commit_graft[pos] = graft;
 136                }
 137                return 1;
 138        }
 139        pos = -pos - 1;
 140        if (commit_graft_alloc <= ++commit_graft_nr) {
 141                commit_graft_alloc = alloc_nr(commit_graft_alloc);
 142                commit_graft = xrealloc(commit_graft,
 143                                        sizeof(*commit_graft) *
 144                                        commit_graft_alloc);
 145        }
 146        if (pos < commit_graft_nr)
 147                memmove(commit_graft + pos + 1,
 148                        commit_graft + pos,
 149                        (commit_graft_nr - pos - 1) *
 150                        sizeof(*commit_graft));
 151        commit_graft[pos] = graft;
 152        return 0;
 153}
 154
 155struct commit_graft *read_graft_line(char *buf, int len)
 156{
 157        /* The format is just "Commit Parent1 Parent2 ...\n" */
 158        int i;
 159        struct commit_graft *graft = NULL;
 160
 161        if (buf[len-1] == '\n')
 162                buf[--len] = 0;
 163        if (buf[0] == '#' || buf[0] == '\0')
 164                return NULL;
 165        if ((len + 1) % 41) {
 166        bad_graft_data:
 167                error("bad graft data: %s", buf);
 168                free(graft);
 169                return NULL;
 170        }
 171        i = (len + 1) / 41 - 1;
 172        graft = xmalloc(sizeof(*graft) + 20 * i);
 173        graft->nr_parent = i;
 174        if (get_sha1_hex(buf, graft->sha1))
 175                goto bad_graft_data;
 176        for (i = 40; i < len; i += 41) {
 177                if (buf[i] != ' ')
 178                        goto bad_graft_data;
 179                if (get_sha1_hex(buf + i + 1, graft->parent[i/41]))
 180                        goto bad_graft_data;
 181        }
 182        return graft;
 183}
 184
 185int read_graft_file(const char *graft_file)
 186{
 187        FILE *fp = fopen(graft_file, "r");
 188        char buf[1024];
 189        if (!fp)
 190                return -1;
 191        while (fgets(buf, sizeof(buf), fp)) {
 192                /* The format is just "Commit Parent1 Parent2 ...\n" */
 193                int len = strlen(buf);
 194                struct commit_graft *graft = read_graft_line(buf, len);
 195                if (!graft)
 196                        continue;
 197                if (register_commit_graft(graft, 1))
 198                        error("duplicate graft data: %s", buf);
 199        }
 200        fclose(fp);
 201        return 0;
 202}
 203
 204static void prepare_commit_graft(void)
 205{
 206        static int commit_graft_prepared;
 207        char *graft_file;
 208
 209        if (commit_graft_prepared)
 210                return;
 211        graft_file = get_graft_file();
 212        read_graft_file(graft_file);
 213        commit_graft_prepared = 1;
 214}
 215
 216static struct commit_graft *lookup_commit_graft(const unsigned char *sha1)
 217{
 218        int pos;
 219        prepare_commit_graft();
 220        pos = commit_graft_pos(sha1);
 221        if (pos < 0)
 222                return NULL;
 223        return commit_graft[pos];
 224}
 225
 226int parse_commit_buffer(struct commit *item, void *buffer, unsigned long size)
 227{
 228        char *bufptr = buffer;
 229        unsigned char parent[20];
 230        struct commit_list **pptr;
 231        struct commit_graft *graft;
 232        unsigned n_refs = 0;
 233
 234        if (item->object.parsed)
 235                return 0;
 236        item->object.parsed = 1;
 237        if (memcmp(bufptr, "tree ", 5))
 238                return error("bogus commit object %s", sha1_to_hex(item->object.sha1));
 239        if (get_sha1_hex(bufptr + 5, parent) < 0)
 240                return error("bad tree pointer in commit %s",
 241                             sha1_to_hex(item->object.sha1));
 242        item->tree = lookup_tree(parent);
 243        if (item->tree)
 244                n_refs++;
 245        bufptr += 46; /* "tree " + "hex sha1" + "\n" */
 246        pptr = &item->parents;
 247
 248        graft = lookup_commit_graft(item->object.sha1);
 249        while (!memcmp(bufptr, "parent ", 7)) {
 250                struct commit *new_parent;
 251
 252                if (get_sha1_hex(bufptr + 7, parent) || bufptr[47] != '\n')
 253                        return error("bad parents in commit %s", sha1_to_hex(item->object.sha1));
 254                bufptr += 48;
 255                if (graft)
 256                        continue;
 257                new_parent = lookup_commit(parent);
 258                if (new_parent) {
 259                        pptr = &commit_list_insert(new_parent, pptr)->next;
 260                        n_refs++;
 261                }
 262        }
 263        if (graft) {
 264                int i;
 265                struct commit *new_parent;
 266                for (i = 0; i < graft->nr_parent; i++) {
 267                        new_parent = lookup_commit(graft->parent[i]);
 268                        if (!new_parent)
 269                                continue;
 270                        pptr = &commit_list_insert(new_parent, pptr)->next;
 271                        n_refs++;
 272                }
 273        }
 274        item->date = parse_commit_date(bufptr);
 275
 276        if (track_object_refs) {
 277                unsigned i = 0;
 278                struct commit_list *p;
 279                struct object_refs *refs = alloc_object_refs(n_refs);
 280                if (item->tree)
 281                        refs->ref[i++] = &item->tree->object;
 282                for (p = item->parents; p; p = p->next)
 283                        refs->ref[i++] = &p->item->object;
 284                set_object_refs(&item->object, refs);
 285        }
 286
 287        return 0;
 288}
 289
 290int parse_commit(struct commit *item)
 291{
 292        char type[20];
 293        void *buffer;
 294        unsigned long size;
 295        int ret;
 296
 297        if (item->object.parsed)
 298                return 0;
 299        buffer = read_sha1_file(item->object.sha1, type, &size);
 300        if (!buffer)
 301                return error("Could not read %s",
 302                             sha1_to_hex(item->object.sha1));
 303        if (strcmp(type, commit_type)) {
 304                free(buffer);
 305                return error("Object %s not a commit",
 306                             sha1_to_hex(item->object.sha1));
 307        }
 308        ret = parse_commit_buffer(item, buffer, size);
 309        if (save_commit_buffer && !ret) {
 310                item->buffer = buffer;
 311                return 0;
 312        }
 313        free(buffer);
 314        return ret;
 315}
 316
 317struct commit_list *commit_list_insert(struct commit *item, struct commit_list **list_p)
 318{
 319        struct commit_list *new_list = xmalloc(sizeof(struct commit_list));
 320        new_list->item = item;
 321        new_list->next = *list_p;
 322        *list_p = new_list;
 323        return new_list;
 324}
 325
 326void free_commit_list(struct commit_list *list)
 327{
 328        while (list) {
 329                struct commit_list *temp = list;
 330                list = temp->next;
 331                free(temp);
 332        }
 333}
 334
 335struct commit_list * insert_by_date(struct commit *item, struct commit_list **list)
 336{
 337        struct commit_list **pp = list;
 338        struct commit_list *p;
 339        while ((p = *pp) != NULL) {
 340                if (p->item->date < item->date) {
 341                        break;
 342                }
 343                pp = &p->next;
 344        }
 345        return commit_list_insert(item, pp);
 346}
 347
 348        
 349void sort_by_date(struct commit_list **list)
 350{
 351        struct commit_list *ret = NULL;
 352        while (*list) {
 353                insert_by_date((*list)->item, &ret);
 354                *list = (*list)->next;
 355        }
 356        *list = ret;
 357}
 358
 359struct commit *pop_most_recent_commit(struct commit_list **list,
 360                                      unsigned int mark)
 361{
 362        struct commit *ret = (*list)->item;
 363        struct commit_list *parents = ret->parents;
 364        struct commit_list *old = *list;
 365
 366        *list = (*list)->next;
 367        free(old);
 368
 369        while (parents) {
 370                struct commit *commit = parents->item;
 371                parse_commit(commit);
 372                if (!(commit->object.flags & mark)) {
 373                        commit->object.flags |= mark;
 374                        insert_by_date(commit, list);
 375                }
 376                parents = parents->next;
 377        }
 378        return ret;
 379}
 380
 381void clear_commit_marks(struct commit *commit, unsigned int mark)
 382{
 383        struct commit_list *parents;
 384
 385        parents = commit->parents;
 386        commit->object.flags &= ~mark;
 387        while (parents) {
 388                struct commit *parent = parents->item;
 389                if (parent && parent->object.parsed &&
 390                    (parent->object.flags & mark))
 391                        clear_commit_marks(parent, mark);
 392                parents = parents->next;
 393        }
 394}
 395
 396/*
 397 * Generic support for pretty-printing the header
 398 */
 399static int get_one_line(const char *msg, unsigned long len)
 400{
 401        int ret = 0;
 402
 403        while (len--) {
 404                char c = *msg++;
 405                if (!c)
 406                        break;
 407                ret++;
 408                if (c == '\n')
 409                        break;
 410        }
 411        return ret;
 412}
 413
 414static int add_user_info(const char *what, enum cmit_fmt fmt, char *buf, const char *line)
 415{
 416        char *date;
 417        int namelen;
 418        unsigned long time;
 419        int tz, ret;
 420        const char *filler = "    ";
 421
 422        if (fmt == CMIT_FMT_ONELINE)
 423                return 0;
 424        date = strchr(line, '>');
 425        if (!date)
 426                return 0;
 427        namelen = ++date - line;
 428        time = strtoul(date, &date, 10);
 429        tz = strtol(date, NULL, 10);
 430
 431        ret = sprintf(buf, "%s: %.*s%.*s\n", what,
 432                      (fmt == CMIT_FMT_FULLER) ? 4 : 0,
 433                      filler, namelen, line);
 434        switch (fmt) {
 435        case CMIT_FMT_MEDIUM:
 436                ret += sprintf(buf + ret, "Date:   %s\n", show_date(time, tz));
 437                break;
 438        case CMIT_FMT_FULLER:
 439                ret += sprintf(buf + ret, "%sDate: %s\n", what, show_date(time, tz));
 440                break;
 441        default:
 442                /* notin' */
 443                break;
 444        }
 445        return ret;
 446}
 447
 448static int is_empty_line(const char *line, int len)
 449{
 450        while (len && isspace(line[len-1]))
 451                len--;
 452        return !len;
 453}
 454
 455static int add_merge_info(enum cmit_fmt fmt, char *buf, const struct commit *commit, int abbrev)
 456{
 457        struct commit_list *parent = commit->parents;
 458        int offset;
 459
 460        if ((fmt == CMIT_FMT_ONELINE) || !parent || !parent->next)
 461                return 0;
 462
 463        offset = sprintf(buf, "Merge:");
 464
 465        while (parent) {
 466                struct commit *p = parent->item;
 467                const char *hex = abbrev
 468                        ? find_unique_abbrev(p->object.sha1, abbrev)
 469                        : sha1_to_hex(p->object.sha1);
 470                char *dots = (abbrev && strlen(hex) != 40) ? "..." : "";
 471                parent = parent->next;
 472
 473                offset += sprintf(buf + offset, " %s%s", hex, dots);
 474        }
 475        buf[offset++] = '\n';
 476        return offset;
 477}
 478
 479unsigned long pretty_print_commit(enum cmit_fmt fmt, const struct commit *commit, unsigned long len, char *buf, unsigned long space, int abbrev)
 480{
 481        int hdr = 1, body = 0;
 482        unsigned long offset = 0;
 483        int indent = (fmt == CMIT_FMT_ONELINE) ? 0 : 4;
 484        int parents_shown = 0;
 485        const char *msg = commit->buffer;
 486
 487        for (;;) {
 488                const char *line = msg;
 489                int linelen = get_one_line(msg, len);
 490
 491                if (!linelen)
 492                        break;
 493
 494                /*
 495                 * We want some slop for indentation and a possible
 496                 * final "...". Thus the "+ 20".
 497                 */
 498                if (offset + linelen + 20 > space) {
 499                        memcpy(buf + offset, "    ...\n", 8);
 500                        offset += 8;
 501                        break;
 502                }
 503
 504                msg += linelen;
 505                len -= linelen;
 506                if (hdr) {
 507                        if (linelen == 1) {
 508                                hdr = 0;
 509                                if (fmt != CMIT_FMT_ONELINE)
 510                                        buf[offset++] = '\n';
 511                                continue;
 512                        }
 513                        if (fmt == CMIT_FMT_RAW) {
 514                                memcpy(buf + offset, line, linelen);
 515                                offset += linelen;
 516                                continue;
 517                        }
 518                        if (!memcmp(line, "parent ", 7)) {
 519                                if (linelen != 48)
 520                                        die("bad parent line in commit");
 521                                continue;
 522                        }
 523
 524                        if (!parents_shown) {
 525                                offset += add_merge_info(fmt, buf + offset,
 526                                                         commit, abbrev);
 527                                parents_shown = 1;
 528                                continue;
 529                        }
 530                        /*
 531                         * MEDIUM == DEFAULT shows only author with dates.
 532                         * FULL shows both authors but not dates.
 533                         * FULLER shows both authors and dates.
 534                         */
 535                        if (!memcmp(line, "author ", 7))
 536                                offset += add_user_info("Author", fmt,
 537                                                        buf + offset,
 538                                                        line + 7);
 539                        if (!memcmp(line, "committer ", 10) &&
 540                            (fmt == CMIT_FMT_FULL || fmt == CMIT_FMT_FULLER))
 541                                offset += add_user_info("Commit", fmt,
 542                                                        buf + offset,
 543                                                        line + 10);
 544                        continue;
 545                }
 546
 547                if (is_empty_line(line, linelen)) {
 548                        if (!body)
 549                                continue;
 550                        if (fmt == CMIT_FMT_SHORT)
 551                                break;
 552                } else {
 553                        body = 1;
 554                }
 555
 556                memset(buf + offset, ' ', indent);
 557                memcpy(buf + offset + indent, line, linelen);
 558                offset += linelen + indent;
 559                if (fmt == CMIT_FMT_ONELINE)
 560                        break;
 561        }
 562        while (offset && isspace(buf[offset-1]))
 563                offset--;
 564        /* Make sure there is an EOLN for the non-oneline case */
 565        if (fmt != CMIT_FMT_ONELINE)
 566                buf[offset++] = '\n';
 567        buf[offset] = '\0';
 568        return offset;
 569}
 570
 571struct commit *pop_commit(struct commit_list **stack)
 572{
 573        struct commit_list *top = *stack;
 574        struct commit *item = top ? top->item : NULL;
 575
 576        if (top) {
 577                *stack = top->next;
 578                free(top);
 579        }
 580        return item;
 581}
 582
 583int count_parents(struct commit * commit)
 584{
 585        int count = 0;
 586        struct commit_list * parents = commit->parents;
 587        for (count=0;parents; parents=parents->next,count++)
 588          ;
 589        return count;
 590}
 591
 592void topo_sort_default_setter(struct commit *c, void *data)
 593{
 594        c->object.util = data;
 595}
 596
 597void *topo_sort_default_getter(struct commit *c)
 598{
 599        return c->object.util;
 600}
 601
 602/*
 603 * Performs an in-place topological sort on the list supplied.
 604 */
 605void sort_in_topological_order(struct commit_list ** list, int lifo)
 606{
 607        sort_in_topological_order_fn(list, lifo, topo_sort_default_setter,
 608                                     topo_sort_default_getter);
 609}
 610
 611void sort_in_topological_order_fn(struct commit_list ** list, int lifo,
 612                                  topo_sort_set_fn_t setter,
 613                                  topo_sort_get_fn_t getter)
 614{
 615        struct commit_list * next = *list;
 616        struct commit_list * work = NULL, **insert;
 617        struct commit_list ** pptr = list;
 618        struct sort_node * nodes;
 619        struct sort_node * next_nodes;
 620        int count = 0;
 621
 622        /* determine the size of the list */
 623        while (next) {
 624                next = next->next;
 625                count++;
 626        }
 627        
 628        if (!count)
 629                return;
 630        /* allocate an array to help sort the list */
 631        nodes = xcalloc(count, sizeof(*nodes));
 632        /* link the list to the array */
 633        next_nodes = nodes;
 634        next=*list;
 635        while (next) {
 636                next_nodes->list_item = next;
 637                setter(next->item, next_nodes);
 638                next_nodes++;
 639                next = next->next;
 640        }
 641        /* update the indegree */
 642        next=*list;
 643        while (next) {
 644                struct commit_list * parents = next->item->parents;
 645                while (parents) {
 646                        struct commit * parent=parents->item;
 647                        struct sort_node * pn = (struct sort_node *) getter(parent);
 648
 649                        if (pn)
 650                                pn->indegree++;
 651                        parents=parents->next;
 652                }
 653                next=next->next;
 654        }
 655        /* 
 656         * find the tips
 657         *
 658         * tips are nodes not reachable from any other node in the list 
 659         * 
 660         * the tips serve as a starting set for the work queue.
 661         */
 662        next=*list;
 663        insert = &work;
 664        while (next) {
 665                struct sort_node * node = (struct sort_node *) getter(next->item);
 666
 667                if (node->indegree == 0) {
 668                        insert = &commit_list_insert(next->item, insert)->next;
 669                }
 670                next=next->next;
 671        }
 672
 673        /* process the list in topological order */
 674        if (!lifo)
 675                sort_by_date(&work);
 676        while (work) {
 677                struct commit * work_item = pop_commit(&work);
 678                struct sort_node * work_node = (struct sort_node *) getter(work_item);
 679                struct commit_list * parents = work_item->parents;
 680
 681                while (parents) {
 682                        struct commit * parent=parents->item;
 683                        struct sort_node * pn = (struct sort_node *) getter(parent);
 684
 685                        if (pn) {
 686                                /*
 687                                 * parents are only enqueued for emission 
 688                                 * when all their children have been emitted thereby
 689                                 * guaranteeing topological order.
 690                                 */
 691                                pn->indegree--;
 692                                if (!pn->indegree) {
 693                                        if (!lifo)
 694                                                insert_by_date(parent, &work);
 695                                        else
 696                                                commit_list_insert(parent, &work);
 697                                }
 698                        }
 699                        parents=parents->next;
 700                }
 701                /*
 702                 * work_item is a commit all of whose children
 703                 * have already been emitted. we can emit it now.
 704                 */
 705                *pptr = work_node->list_item;
 706                pptr = &(*pptr)->next;
 707                *pptr = NULL;
 708                setter(work_item, NULL);
 709        }
 710        free(nodes);
 711}