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