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