rev-list.c

   1 #include "cache.h"
   2 #include "refs.h"
   3 #include "tag.h"
   4 #include "commit.h"
   5 #include "tree.h"
   6 #include "blob.h"
   7 #include "epoch.h"
   8 #include "diff.h"
   9
  10 #define SEEN            (1u << 0)
  11 #define INTERESTING     (1u << 1)
  12 #define COUNTED         (1u << 2)
  13 #define SHOWN           (1u << 3)
  14 #define TREECHANGE      (1u << 4)
  15
  16 static const char rev_list_usage[] =
  17 "git-rev-list [OPTION] <commit-id>... [ -- paths... ]\n"
  18 "  limiting output:\n"
  19 "    --max-count=nr\n"
  20 "    --max-age=epoch\n"
  21 "    --min-age=epoch\n"
  22 "    --sparse\n"
  23 "    --no-merges\n"
  24 "    --all\n"
  25 "  ordering output:\n"
  26 "    --merge-order [ --show-breaks ]\n"
  27 "    --topo-order\n"
  28 "  formatting output:\n"
  29 "    --parents\n"
  30 "    --objects\n"
  31 "    --unpacked\n"
  32 "    --header | --pretty\n"
  33 "  special purpose:\n"
  34 "    --bisect"
  35 ;
  36
  37 static int dense = 1;
  38 static int unpacked = 0;
  39 static int bisect_list = 0;
  40 static int tag_objects = 0;
  41 static int tree_objects = 0;
  42 static int blob_objects = 0;
  43 static int verbose_header = 0;
  44 static int show_parents = 0;
  45 static int hdr_termination = 0;
  46 static const char *commit_prefix = "";
  47 static unsigned long max_age = -1;
  48 static unsigned long min_age = -1;
  49 static int max_count = -1;
  50 static enum cmit_fmt commit_format = CMIT_FMT_RAW;
  51 static int merge_order = 0;
  52 static int show_breaks = 0;
  53 static int stop_traversal = 0;
  54 static int topo_order = 0;
  55 static int no_merges = 0;
  56 static const char **paths = NULL;
  57 static int remove_empty_trees = 0;
  58
  59 static void show_commit(struct commit *commit)
  60 {
  61         commit->object.flags |= SHOWN;
  62         if (show_breaks) {
  63                 commit_prefix = "| ";
  64                 if (commit->object.flags & DISCONTINUITY) {
  65                         commit_prefix = "^ ";
  66                 } else if (commit->object.flags & BOUNDARY) {
  67                         commit_prefix = "= ";
  68                 }
  69         }
  70         printf("%s%s", commit_prefix, sha1_to_hex(commit->object.sha1));
  71         if (show_parents) {
  72                 struct commit_list *parents = commit->parents;
  73                 while (parents) {
  74                         printf(" %s", sha1_to_hex(parents->item->object.sha1));
  75                         parents = parents->next;
  76                 }
  77         }
  78         if (commit_format == CMIT_FMT_ONELINE)
  79                 putchar(' ');
  80         else
  81                 putchar('\n');
  82
  83         if (verbose_header) {
  84                 static char pretty_header[16384];
  85                 pretty_print_commit(commit_format, commit->buffer, ~0, pretty_header, sizeof(pretty_header));
  86                 printf("%s%c", pretty_header, hdr_termination);
  87         }
  88         fflush(stdout);
  89 }
  90
  91 static int rewrite_one(struct commit **pp)
  92 {
  93         for (;;) {
  94                 struct commit *p = *pp;
  95                 if (p->object.flags & (TREECHANGE | UNINTERESTING))
  96                         return 0;
  97                 if (!p->parents)
  98                         return -1;
  99                 *pp = p->parents->item;
 100         }
 101 }
 102
 103 static void rewrite_parents(struct commit *commit)
 104 {
 105         struct commit_list **pp = &commit->parents;
 106         while (*pp) {
 107                 struct commit_list *parent = *pp;
 108                 if (rewrite_one(&parent->item) < 0) {
 109                         *pp = parent->next;
 110                         continue;
 111                 }
 112                 pp = &parent->next;
 113         }
 114 }
 115
 116 static int filter_commit(struct commit * commit)
 117 {
 118         if (stop_traversal && (commit->object.flags & BOUNDARY))
 119                 return STOP;
 120         if (commit->object.flags & (UNINTERESTING|SHOWN))
 121                 return CONTINUE;
 122         if (min_age != -1 && (commit->date > min_age))
 123                 return CONTINUE;
 124         if (max_age != -1 && (commit->date < max_age)) {
 125                 stop_traversal=1;
 126                 return CONTINUE;
 127         }
 128         if (no_merges && (commit->parents && commit->parents->next))
 129                 return CONTINUE;
 130         if (paths && dense) {
 131                 if (!(commit->object.flags & TREECHANGE))
 132                         return CONTINUE;
 133                 rewrite_parents(commit);
 134         }
 135         return DO;
 136 }
 137
 138 static int process_commit(struct commit * commit)
 139 {
 140         int action=filter_commit(commit);
 141
 142         if (action == STOP) {
 143                 return STOP;
 144         }
 145
 146         if (action == CONTINUE) {
 147                 return CONTINUE;
 148         }
 149
 150         if (max_count != -1 && !max_count--)
 151                 return STOP;
 152
 153         show_commit(commit);
 154
 155         return CONTINUE;
 156 }
 157
 158 static struct object_list **add_object(struct object *obj, struct object_list **p, const char *name)
 159 {
 160         struct object_list *entry = xmalloc(sizeof(*entry));
 161         entry->item = obj;
 162         entry->next = *p;
 163         entry->name = name;
 164         *p = entry;
 165         return &entry->next;
 166 }
 167
 168 static struct object_list **process_blob(struct blob *blob, struct object_list **p, const char *name)
 169 {
 170         struct object *obj = &blob->object;
 171
 172         if (!blob_objects)
 173                 return p;
 174         if (obj->flags & (UNINTERESTING | SEEN))
 175                 return p;
 176         obj->flags |= SEEN;
 177         return add_object(obj, p, name);
 178 }
 179
 180 static struct object_list **process_tree(struct tree *tree, struct object_list **p, const char *name)
 181 {
 182         struct object *obj = &tree->object;
 183         struct tree_entry_list *entry;
 184
 185         if (!tree_objects)
 186                 return p;
 187         if (obj->flags & (UNINTERESTING | SEEN))
 188                 return p;
 189         if (parse_tree(tree) < 0)
 190                 die("bad tree object %s", sha1_to_hex(obj->sha1));
 191         obj->flags |= SEEN;
 192         p = add_object(obj, p, name);
 193         entry = tree->entries;
 194         tree->entries = NULL;
 195         while (entry) {
 196                 struct tree_entry_list *next = entry->next;
 197                 if (entry->directory)
 198                         p = process_tree(entry->item.tree, p, entry->name);
 199                 else
 200                         p = process_blob(entry->item.blob, p, entry->name);
 201                 free(entry);
 202                 entry = next;
 203         }
 204         return p;
 205 }
 206
 207 static struct object_list *pending_objects = NULL;
 208
 209 static void show_commit_list(struct commit_list *list)
 210 {
 211         struct object_list *objects = NULL, **p = &objects, *pending;
 212         while (list) {
 213                 struct commit *commit = pop_most_recent_commit(&list, SEEN);
 214
 215                 p = process_tree(commit->tree, p, "");
 216                 if (process_commit(commit) == STOP)
 217                         break;
 218         }
 219         for (pending = pending_objects; pending; pending = pending->next) {
 220                 struct object *obj = pending->item;
 221                 const char *name = pending->name;
 222                 if (obj->flags & (UNINTERESTING | SEEN))
 223                         continue;
 224                 if (obj->type == tag_type) {
 225                         obj->flags |= SEEN;
 226                         p = add_object(obj, p, name);
 227                         continue;
 228                 }
 229                 if (obj->type == tree_type) {
 230                         p = process_tree((struct tree *)obj, p, name);
 231                         continue;
 232                 }
 233                 if (obj->type == blob_type) {
 234                         p = process_blob((struct blob *)obj, p, name);
 235                         continue;
 236                 }
 237                 die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
 238         }
 239         while (objects) {
 240                 /* An object with name "foo\n0000000000000000000000000000000000000000"
 241                  * can be used confuse downstream git-pack-objects very badly.
 242                  */
 243                 const char *ep = strchr(objects->name, '\n');
 244                 if (ep) {
 245                         printf("%s %.*s\n", sha1_to_hex(objects->item->sha1),
 246                                (int) (ep - objects->name),
 247                                objects->name);
 248                 }
 249                 else
 250                         printf("%s %s\n", sha1_to_hex(objects->item->sha1), objects->name);
 251                 objects = objects->next;
 252         }
 253 }
 254
 255 static void mark_blob_uninteresting(struct blob *blob)
 256 {
 257         if (!blob_objects)
 258                 return;
 259         if (blob->object.flags & UNINTERESTING)
 260                 return;
 261         blob->object.flags |= UNINTERESTING;
 262 }
 263
 264 static void mark_tree_uninteresting(struct tree *tree)
 265 {
 266         struct object *obj = &tree->object;
 267         struct tree_entry_list *entry;
 268
 269         if (!tree_objects)
 270                 return;
 271         if (obj->flags & UNINTERESTING)
 272                 return;
 273         obj->flags |= UNINTERESTING;
 274         if (!has_sha1_file(obj->sha1))
 275                 return;
 276         if (parse_tree(tree) < 0)
 277                 die("bad tree %s", sha1_to_hex(obj->sha1));
 278         entry = tree->entries;
 279         tree->entries = NULL;
 280         while (entry) {
 281                 struct tree_entry_list *next = entry->next;
 282                 if (entry->directory)
 283                         mark_tree_uninteresting(entry->item.tree);
 284                 else
 285                         mark_blob_uninteresting(entry->item.blob);
 286                 free(entry);
 287                 entry = next;
 288         }
 289 }
 290
 291 static void mark_parents_uninteresting(struct commit *commit)
 292 {
 293         struct commit_list *parents = commit->parents;
 294
 295         while (parents) {
 296                 struct commit *commit = parents->item;
 297                 commit->object.flags |= UNINTERESTING;
 298
 299                 /*
 300                  * Normally we haven't parsed the parent
 301                  * yet, so we won't have a parent of a parent
 302                  * here. However, it may turn out that we've
 303                  * reached this commit some other way (where it
 304                  * wasn't uninteresting), in which case we need
 305                  * to mark its parents recursively too..
 306                  */
 307                 if (commit->parents)
 308                         mark_parents_uninteresting(commit);
 309
 310                 /*
 311                  * A missing commit is ok iff its parent is marked
 312                  * uninteresting.
 313                  *
 314                  * We just mark such a thing parsed, so that when
 315                  * it is popped next time around, we won't be trying
 316                  * to parse it and get an error.
 317                  */
 318                 if (!has_sha1_file(commit->object.sha1))
 319                         commit->object.parsed = 1;
 320                 parents = parents->next;
 321         }
 322 }
 323
 324 static int everybody_uninteresting(struct commit_list *orig)
 325 {
 326         struct commit_list *list = orig;
 327         while (list) {
 328                 struct commit *commit = list->item;
 329                 list = list->next;
 330                 if (commit->object.flags & UNINTERESTING)
 331                         continue;
 332                 return 0;
 333         }
 334         return 1;
 335 }
 336
 337 /*
 338  * This is a truly stupid algorithm, but it's only
 339  * used for bisection, and we just don't care enough.
 340  *
 341  * We care just barely enough to avoid recursing for
 342  * non-merge entries.
 343  */
 344 static int count_distance(struct commit_list *entry)
 345 {
 346         int nr = 0;
 347
 348         while (entry) {
 349                 struct commit *commit = entry->item;
 350                 struct commit_list *p;
 351
 352                 if (commit->object.flags & (UNINTERESTING | COUNTED))
 353                         break;
 354                 if (!paths || (commit->object.flags & TREECHANGE))
 355                         nr++;
 356                 commit->object.flags |= COUNTED;
 357                 p = commit->parents;
 358                 entry = p;
 359                 if (p) {
 360                         p = p->next;
 361                         while (p) {
 362                                 nr += count_distance(p);
 363                                 p = p->next;
 364                         }
 365                 }
 366         }
 367
 368         return nr;
 369 }
 370
 371 static void clear_distance(struct commit_list *list)
 372 {
 373         while (list) {
 374                 struct commit *commit = list->item;
 375                 commit->object.flags &= ~COUNTED;
 376                 list = list->next;
 377         }
 378 }
 379
 380 static struct commit_list *find_bisection(struct commit_list *list)
 381 {
 382         int nr, closest;
 383         struct commit_list *p, *best;
 384
 385         nr = 0;
 386         p = list;
 387         while (p) {
 388                 if (!paths || (p->item->object.flags & TREECHANGE))
 389                         nr++;
 390                 p = p->next;
 391         }
 392         closest = 0;
 393         best = list;
 394
 395         for (p = list; p; p = p->next) {
 396                 int distance;
 397
 398                 if (paths && !(p->item->object.flags & TREECHANGE))
 399                         continue;
 400
 401                 distance = count_distance(p);
 402                 clear_distance(list);
 403                 if (nr - distance < distance)
 404                         distance = nr - distance;
 405                 if (distance > closest) {
 406                         best = p;
 407                         closest = distance;
 408                 }
 409         }
 410         if (best)
 411                 best->next = NULL;
 412         return best;
 413 }
 414
 415 static void mark_edges_uninteresting(struct commit_list *list)
 416 {
 417         for ( ; list; list = list->next) {
 418                 struct commit_list *parents = list->item->parents;
 419
 420                 for ( ; parents; parents = parents->next) {
 421                         struct commit *commit = parents->item;
 422                         if (commit->object.flags & UNINTERESTING)
 423                                 mark_tree_uninteresting(commit->tree);
 424                 }
 425         }
 426 }
 427
 428 #define TREE_SAME       0
 429 #define TREE_NEW        1
 430 #define TREE_DIFFERENT  2
 431 static int tree_difference = TREE_SAME;
 432
 433 static void file_add_remove(struct diff_options *options,
 434                     int addremove, unsigned mode,
 435                     const unsigned char *sha1,
 436                     const char *base, const char *path)
 437 {
 438         int diff = TREE_DIFFERENT;
 439
 440         /*
 441          * Is it an add of a new file? It means that
 442          * the old tree didn't have it at all, so we
 443          * will turn "TREE_SAME" -> "TREE_NEW", but
 444          * leave any "TREE_DIFFERENT" alone (and if
 445          * it already was "TREE_NEW", we'll keep it
 446          * "TREE_NEW" of course).
 447          */
 448         if (addremove == '+') {
 449                 diff = tree_difference;
 450                 if (diff != TREE_SAME)
 451                         return;
 452                 diff = TREE_NEW;
 453         }
 454         tree_difference = diff;
 455 }
 456
 457 static void file_change(struct diff_options *options,
 458                  unsigned old_mode, unsigned new_mode,
 459                  const unsigned char *old_sha1,
 460                  const unsigned char *new_sha1,
 461                  const char *base, const char *path)
 462 {
 463         tree_difference = TREE_DIFFERENT;
 464 }
 465
 466 static struct diff_options diff_opt = {
 467         .recursive = 1,
 468         .add_remove = file_add_remove,
 469         .change = file_change,
 470 };
 471
 472 static int compare_tree(struct tree *t1, struct tree *t2)
 473 {
 474         if (!t1)
 475                 return TREE_NEW;
 476         if (!t2)
 477                 return TREE_DIFFERENT;
 478         tree_difference = TREE_SAME;
 479         if (diff_tree_sha1(t1->object.sha1, t2->object.sha1, "", &diff_opt) < 0)
 480                 return TREE_DIFFERENT;
 481         return tree_difference;
 482 }
 483
 484 static int same_tree_as_empty(struct tree *t1)
 485 {
 486         int retval;
 487         void *tree;
 488         struct tree_desc empty, real;
 489
 490         if (!t1)
 491                 return 0;
 492
 493         tree = read_object_with_reference(t1->object.sha1, "tree", &real.size, NULL);
 494         if (!tree)
 495                 return 0;
 496         real.buf = tree;
 497
 498         empty.buf = "";
 499         empty.size = 0;
 500
 501         tree_difference = 0;
 502         retval = diff_tree(&empty, &real, "", &diff_opt);
 503         free(tree);
 504
 505         return retval >= 0 && !tree_difference;
 506 }
 507
 508 static void try_to_simplify_commit(struct commit *commit)
 509 {
 510         struct commit_list **pp, *parent;
 511
 512         if (!commit->tree)
 513                 return;
 514
 515         if (!commit->parents) {
 516                 if (!same_tree_as_empty(commit->tree))
 517                         commit->object.flags |= TREECHANGE;
 518                 return;
 519         }
 520
 521         pp = &commit->parents;
 522         while ((parent = *pp) != NULL) {
 523                 struct commit *p = parent->item;
 524
 525                 if (p->object.flags & UNINTERESTING) {
 526                         pp = &parent->next;
 527                         continue;
 528                 }
 529
 530                 parse_commit(p);
 531                 switch (compare_tree(p->tree, commit->tree)) {
 532                 case TREE_SAME:
 533                         parent->next = NULL;
 534                         commit->parents = parent;
 535                         return;
 536
 537                 case TREE_NEW:
 538                         if (remove_empty_trees && same_tree_as_empty(p->tree)) {
 539                                 *pp = parent->next;
 540                                 continue;
 541                         }
 542                 /* fallthrough */
 543                 case TREE_DIFFERENT:
 544                         pp = &parent->next;
 545                         continue;
 546                 }
 547                 die("bad tree compare for commit %s", sha1_to_hex(commit->object.sha1));
 548         }
 549         commit->object.flags |= TREECHANGE;
 550 }
 551
 552 static void add_parents_to_list(struct commit *commit, struct commit_list **list)
 553 {
 554         struct commit_list *parent = commit->parents;
 555
 556         /*
 557          * If the commit is uninteresting, don't try to
 558          * prune parents - we want the maximal uninteresting
 559          * set.
 560          *
 561          * Normally we haven't parsed the parent
 562          * yet, so we won't have a parent of a parent
 563          * here. However, it may turn out that we've
 564          * reached this commit some other way (where it
 565          * wasn't uninteresting), in which case we need
 566          * to mark its parents recursively too..
 567          */
 568         if (commit->object.flags & UNINTERESTING) {
 569                 while (parent) {
 570                         struct commit *p = parent->item;
 571                         parent = parent->next;
 572                         parse_commit(p);
 573                         p->object.flags |= UNINTERESTING;
 574                         if (p->parents)
 575                                 mark_parents_uninteresting(p);
 576                         if (p->object.flags & SEEN)
 577                                 continue;
 578                         p->object.flags |= SEEN;
 579                         insert_by_date(p, list);
 580                 }
 581                 return;
 582         }
 583
 584         /*
 585          * Ok, the commit wasn't uninteresting. Try to
 586          * simplify the commit history and find the parent
 587          * that has no differences in the path set if one exists.
 588          */
 589         if (paths)
 590                 try_to_simplify_commit(commit);
 591
 592         parent = commit->parents;
 593         while (parent) {
 594                 struct commit *p = parent->item;
 595
 596                 parent = parent->next;
 597
 598                 parse_commit(p);
 599                 if (p->object.flags & SEEN)
 600                         continue;
 601                 p->object.flags |= SEEN;
 602                 insert_by_date(p, list);
 603         }
 604 }
 605
 606 static struct commit_list *limit_list(struct commit_list *list)
 607 {
 608         struct commit_list *newlist = NULL;
 609         struct commit_list **p = &newlist;
 610         while (list) {
 611                 struct commit_list *entry = list;
 612                 struct commit *commit = list->item;
 613                 struct object *obj = &commit->object;
 614
 615                 list = list->next;
 616                 free(entry);
 617
 618                 if (max_age != -1 && (commit->date < max_age))
 619                         obj->flags |= UNINTERESTING;
 620                 if (unpacked && has_sha1_pack(obj->sha1))
 621                         obj->flags |= UNINTERESTING;
 622                 add_parents_to_list(commit, &list);
 623                 if (obj->flags & UNINTERESTING) {
 624                         mark_parents_uninteresting(commit);
 625                         if (everybody_uninteresting(list))
 626                                 break;
 627                         continue;
 628                 }
 629                 if (min_age != -1 && (commit->date > min_age))
 630                         continue;
 631                 p = &commit_list_insert(commit, p)->next;
 632         }
 633         if (tree_objects)
 634                 mark_edges_uninteresting(newlist);
 635         if (bisect_list)
 636                 newlist = find_bisection(newlist);
 637         return newlist;
 638 }
 639
 640 static void add_pending_object(struct object *obj, const char *name)
 641 {
 642         add_object(obj, &pending_objects, name);
 643 }
 644
 645 static struct commit *get_commit_reference(const char *name, const unsigned char *sha1, unsigned int flags)
 646 {
 647         struct object *object;
 648
 649         object = parse_object(sha1);
 650         if (!object)
 651                 die("bad object %s", name);
 652
 653         /*
 654          * Tag object? Look what it points to..
 655          */
 656         while (object->type == tag_type) {
 657                 struct tag *tag = (struct tag *) object;
 658                 object->flags |= flags;
 659                 if (tag_objects && !(object->flags & UNINTERESTING))
 660                         add_pending_object(object, tag->tag);
 661                 object = parse_object(tag->tagged->sha1);
 662                 if (!object)
 663                         die("bad object %s", sha1_to_hex(tag->tagged->sha1));
 664         }
 665
 666         /*
 667          * Commit object? Just return it, we'll do all the complex
 668          * reachability crud.
 669          */
 670         if (object->type == commit_type) {
 671                 struct commit *commit = (struct commit *)object;
 672                 object->flags |= flags;
 673                 if (parse_commit(commit) < 0)
 674                         die("unable to parse commit %s", name);
 675                 if (flags & UNINTERESTING)
 676                         mark_parents_uninteresting(commit);
 677                 return commit;
 678         }
 679
 680         /*
 681          * Tree object? Either mark it uniniteresting, or add it
 682          * to the list of objects to look at later..
 683          */
 684         if (object->type == tree_type) {
 685                 struct tree *tree = (struct tree *)object;
 686                 if (!tree_objects)
 687                         return NULL;
 688                 if (flags & UNINTERESTING) {
 689                         mark_tree_uninteresting(tree);
 690                         return NULL;
 691                 }
 692                 add_pending_object(object, "");
 693                 return NULL;
 694         }
 695
 696         /*
 697          * Blob object? You know the drill by now..
 698          */
 699         if (object->type == blob_type) {
 700                 struct blob *blob = (struct blob *)object;
 701                 if (!blob_objects)
 702                         return NULL;
 703                 if (flags & UNINTERESTING) {
 704                         mark_blob_uninteresting(blob);
 705                         return NULL;
 706                 }
 707                 add_pending_object(object, "");
 708                 return NULL;
 709         }
 710         die("%s is unknown object", name);
 711 }
 712
 713 static void handle_one_commit(struct commit *com, struct commit_list **lst)
 714 {
 715         if (!com || com->object.flags & SEEN)
 716                 return;
 717         com->object.flags |= SEEN;
 718         commit_list_insert(com, lst);
 719 }
 720
 721 /* for_each_ref() callback does not allow user data -- Yuck. */
 722 static struct commit_list **global_lst;
 723
 724 static int include_one_commit(const char *path, const unsigned char *sha1)
 725 {
 726         struct commit *com = get_commit_reference(path, sha1, 0);
 727         handle_one_commit(com, global_lst);
 728         return 0;
 729 }
 730
 731 static void handle_all(struct commit_list **lst)
 732 {
 733         global_lst = lst;
 734         for_each_ref(include_one_commit);
 735         global_lst = NULL;
 736 }
 737
 738 int main(int argc, const char **argv)
 739 {
 740         const char *prefix = setup_git_directory();
 741         struct commit_list *list = NULL;
 742         int i, limited = 0;
 743
 744         for (i = 1 ; i < argc; i++) {
 745                 int flags;
 746                 const char *arg = argv[i];
 747                 char *dotdot;
 748                 struct commit *commit;
 749                 unsigned char sha1[20];
 750
 751                 if (!strncmp(arg, "--max-count=", 12)) {
 752                         max_count = atoi(arg + 12);
 753                         continue;
 754                 }
 755                 if (!strncmp(arg, "--max-age=", 10)) {
 756                         max_age = atoi(arg + 10);
 757                         limited = 1;
 758                         continue;
 759                 }
 760                 if (!strncmp(arg, "--min-age=", 10)) {
 761                         min_age = atoi(arg + 10);
 762                         limited = 1;
 763                         continue;
 764                 }
 765                 if (!strcmp(arg, "--header")) {
 766                         verbose_header = 1;
 767                         continue;
 768                 }
 769                 if (!strncmp(arg, "--pretty", 8)) {
 770                         commit_format = get_commit_format(arg+8);
 771                         verbose_header = 1;
 772                         hdr_termination = '\n';
 773                         if (commit_format == CMIT_FMT_ONELINE)
 774                                 commit_prefix = "";
 775                         else
 776                                 commit_prefix = "commit ";
 777                         continue;
 778                 }
 779                 if (!strncmp(arg, "--no-merges", 11)) {
 780                         no_merges = 1;
 781                         continue;
 782                 }
 783                 if (!strcmp(arg, "--parents")) {
 784                         show_parents = 1;
 785                         continue;
 786                 }
 787                 if (!strcmp(arg, "--bisect")) {
 788                         bisect_list = 1;
 789                         continue;
 790                 }
 791                 if (!strcmp(arg, "--all")) {
 792                         handle_all(&list);
 793                         continue;
 794                 }
 795                 if (!strcmp(arg, "--objects")) {
 796                         tag_objects = 1;
 797                         tree_objects = 1;
 798                         blob_objects = 1;
 799                         continue;
 800                 }
 801                 if (!strcmp(arg, "--unpacked")) {
 802                         unpacked = 1;
 803                         limited = 1;
 804                         continue;
 805                 }
 806                 if (!strcmp(arg, "--merge-order")) {
 807                         merge_order = 1;
 808                         continue;
 809                 }
 810                 if (!strcmp(arg, "--show-breaks")) {
 811                         show_breaks = 1;
 812                         continue;
 813                 }
 814                 if (!strcmp(arg, "--topo-order")) {
 815                         topo_order = 1;
 816                         limited = 1;
 817                         continue;
 818                 }
 819                 if (!strcmp(arg, "--dense")) {
 820                         dense = 1;
 821                         continue;
 822                 }
 823                 if (!strcmp(arg, "--sparse")) {
 824                         dense = 0;
 825                         continue;
 826                 }
 827                 if (!strcmp(arg, "--remove-empty")) {
 828                         remove_empty_trees = 1;
 829                         continue;
 830                 }
 831                 if (!strcmp(arg, "--")) {
 832                         i++;
 833                         break;
 834                 }
 835
 836                 if (show_breaks && !merge_order)
 837                         usage(rev_list_usage);
 838
 839                 flags = 0;
 840                 dotdot = strstr(arg, "..");
 841                 if (dotdot) {
 842                         unsigned char from_sha1[20];
 843                         char *next = dotdot + 2;
 844                         *dotdot = 0;
 845                         if (!*next)
 846                                 next = "HEAD";
 847                         if (!get_sha1(arg, from_sha1) && !get_sha1(next, sha1)) {
 848                                 struct commit *exclude;
 849                                 struct commit *include;
 850
 851                                 exclude = get_commit_reference(arg, from_sha1, UNINTERESTING);
 852                                 include = get_commit_reference(next, sha1, 0);
 853                                 if (!exclude || !include)
 854                                         die("Invalid revision range %s..%s", arg, next);
 855                                 limited = 1;
 856                                 handle_one_commit(exclude, &list);
 857                                 handle_one_commit(include, &list);
 858                                 continue;
 859                         }
 860                         *dotdot = '.';
 861                 }
 862                 if (*arg == '^') {
 863                         flags = UNINTERESTING;
 864                         arg++;
 865                         limited = 1;
 866                 }
 867                 if (get_sha1(arg, sha1) < 0) {
 868                         struct stat st;
 869                         if (lstat(arg, &st) < 0)
 870                                 die("'%s': %s", arg, strerror(errno));
 871                         break;
 872                 }
 873                 commit = get_commit_reference(arg, sha1, flags);
 874                 handle_one_commit(commit, &list);
 875         }
 876
 877         if (!list &&
 878             (!(tag_objects||tree_objects||blob_objects) && !pending_objects))
 879                 usage(rev_list_usage);
 880
 881         paths = get_pathspec(prefix, argv + i);
 882         if (paths) {
 883                 limited = 1;
 884                 diff_tree_setup_paths(paths);
 885         }
 886
 887         save_commit_buffer = verbose_header;
 888         track_object_refs = 0;
 889
 890         if (!merge_order) {
 891                 sort_by_date(&list);
 892                 if (list && !limited && max_count == 1 &&
 893                     !tag_objects && !tree_objects && !blob_objects) {
 894                         show_commit(list->item);
 895                         return 0;
 896                 }
 897                 if (limited)
 898                         list = limit_list(list);
 899                 if (topo_order)
 900                         sort_in_topological_order(&list);
 901                 show_commit_list(list);
 902         } else {
 903 #ifndef NO_OPENSSL
 904                 if (sort_list_in_merge_order(list, &process_commit)) {
 905                         die("merge order sort failed\n");
 906                 }
 907 #else
 908                 die("merge order sort unsupported, OpenSSL not linked");
 909 #endif
 910         }
 911
 912         return 0;
 913 }