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 #define TMP_MARK        (1u << 5) /* for isolated cases; clean after use */
  16
  17 static const char rev_list_usage[] =
  18 "git-rev-list [OPTION] <commit-id>... [ -- paths... ]\n"
  19 "  limiting output:\n"
  20 "    --max-count=nr\n"
  21 "    --max-age=epoch\n"
  22 "    --min-age=epoch\n"
  23 "    --sparse\n"
  24 "    --no-merges\n"
  25 "    --remove-empty\n"
  26 "    --all\n"
  27 "  ordering output:\n"
  28 "    --merge-order [ --show-breaks ]\n"
  29 "    --topo-order\n"
  30 "  formatting output:\n"
  31 "    --parents\n"
  32 "    --objects\n"
  33 "    --unpacked\n"
  34 "    --header | --pretty\n"
  35 "  special purpose:\n"
  36 "    --bisect"
  37 ;
  38
  39 static int dense = 1;
  40 static int unpacked = 0;
  41 static int bisect_list = 0;
  42 static int tag_objects = 0;
  43 static int tree_objects = 0;
  44 static int blob_objects = 0;
  45 static int verbose_header = 0;
  46 static int show_parents = 0;
  47 static int hdr_termination = 0;
  48 static const char *commit_prefix = "";
  49 static unsigned long max_age = -1;
  50 static unsigned long min_age = -1;
  51 static int max_count = -1;
  52 static enum cmit_fmt commit_format = CMIT_FMT_RAW;
  53 static int merge_order = 0;
  54 static int show_breaks = 0;
  55 static int stop_traversal = 0;
  56 static int topo_order = 0;
  57 static int no_merges = 0;
  58 static const char **paths = NULL;
  59 static int remove_empty_trees = 0;
  60
  61 static void show_commit(struct commit *commit)
  62 {
  63         commit->object.flags |= SHOWN;
  64         if (show_breaks) {
  65                 commit_prefix = "| ";
  66                 if (commit->object.flags & DISCONTINUITY) {
  67                         commit_prefix = "^ ";
  68                 } else if (commit->object.flags & BOUNDARY) {
  69                         commit_prefix = "= ";
  70                 }
  71         }
  72         printf("%s%s", commit_prefix, sha1_to_hex(commit->object.sha1));
  73         if (show_parents) {
  74                 struct commit_list *parents = commit->parents;
  75                 while (parents) {
  76                         struct object *o = &(parents->item->object);
  77                         parents = parents->next;
  78                         if (o->flags & TMP_MARK)
  79                                 continue;
  80                         printf(" %s", sha1_to_hex(o->sha1));
  81                         o->flags |= TMP_MARK;
  82                 }
  83                 /* TMP_MARK is a general purpose flag that can
  84                  * be used locally, but the user should clean
  85                  * things up after it is done with them.
  86                  */
  87                 for (parents = commit->parents;
  88                      parents;
  89                      parents = parents->next)
  90                         parents->item->object.flags &= ~TMP_MARK;
  91         }
  92         if (commit_format == CMIT_FMT_ONELINE)
  93                 putchar(' ');
  94         else
  95                 putchar('\n');
  96
  97         if (verbose_header) {
  98                 static char pretty_header[16384];
  99                 pretty_print_commit(commit_format, commit, ~0, pretty_header, sizeof(pretty_header), 0);
 100                 printf("%s%c", pretty_header, hdr_termination);
 101         }
 102         fflush(stdout);
 103 }
 104
 105 static int rewrite_one(struct commit **pp)
 106 {
 107         for (;;) {
 108                 struct commit *p = *pp;
 109                 if (p->object.flags & (TREECHANGE | UNINTERESTING))
 110                         return 0;
 111                 if (!p->parents)
 112                         return -1;
 113                 *pp = p->parents->item;
 114         }
 115 }
 116
 117 static void rewrite_parents(struct commit *commit)
 118 {
 119         struct commit_list **pp = &commit->parents;
 120         while (*pp) {
 121                 struct commit_list *parent = *pp;
 122                 if (rewrite_one(&parent->item) < 0) {
 123                         *pp = parent->next;
 124                         continue;
 125                 }
 126                 pp = &parent->next;
 127         }
 128 }
 129
 130 static int filter_commit(struct commit * commit)
 131 {
 132         if (stop_traversal && (commit->object.flags & BOUNDARY))
 133                 return STOP;
 134         if (commit->object.flags & (UNINTERESTING|SHOWN))
 135                 return CONTINUE;
 136         if (min_age != -1 && (commit->date > min_age))
 137                 return CONTINUE;
 138         if (max_age != -1 && (commit->date < max_age)) {
 139                 stop_traversal=1;
 140                 return CONTINUE;
 141         }
 142         if (no_merges && (commit->parents && commit->parents->next))
 143                 return CONTINUE;
 144         if (paths && dense) {
 145                 if (!(commit->object.flags & TREECHANGE))
 146                         return CONTINUE;
 147                 rewrite_parents(commit);
 148         }
 149         return DO;
 150 }
 151
 152 static int process_commit(struct commit * commit)
 153 {
 154         int action=filter_commit(commit);
 155
 156         if (action == STOP) {
 157                 return STOP;
 158         }
 159
 160         if (action == CONTINUE) {
 161                 return CONTINUE;
 162         }
 163
 164         if (max_count != -1 && !max_count--)
 165                 return STOP;
 166
 167         show_commit(commit);
 168
 169         return CONTINUE;
 170 }
 171
 172 static struct object_list **add_object(struct object *obj, struct object_list **p, const char *name)
 173 {
 174         struct object_list *entry = xmalloc(sizeof(*entry));
 175         entry->item = obj;
 176         entry->next = *p;
 177         entry->name = name;
 178         *p = entry;
 179         return &entry->next;
 180 }
 181
 182 static struct object_list **process_blob(struct blob *blob, struct object_list **p, const char *name)
 183 {
 184         struct object *obj = &blob->object;
 185
 186         if (!blob_objects)
 187                 return p;
 188         if (obj->flags & (UNINTERESTING | SEEN))
 189                 return p;
 190         obj->flags |= SEEN;
 191         return add_object(obj, p, name);
 192 }
 193
 194 static struct object_list **process_tree(struct tree *tree, struct object_list **p, const char *name)
 195 {
 196         struct object *obj = &tree->object;
 197         struct tree_entry_list *entry;
 198
 199         if (!tree_objects)
 200                 return p;
 201         if (obj->flags & (UNINTERESTING | SEEN))
 202                 return p;
 203         if (parse_tree(tree) < 0)
 204                 die("bad tree object %s", sha1_to_hex(obj->sha1));
 205         obj->flags |= SEEN;
 206         p = add_object(obj, p, name);
 207         entry = tree->entries;
 208         tree->entries = NULL;
 209         while (entry) {
 210                 struct tree_entry_list *next = entry->next;
 211                 if (entry->directory)
 212                         p = process_tree(entry->item.tree, p, entry->name);
 213                 else
 214                         p = process_blob(entry->item.blob, p, entry->name);
 215                 free(entry);
 216                 entry = next;
 217         }
 218         return p;
 219 }
 220
 221 static struct object_list *pending_objects = NULL;
 222
 223 static void show_commit_list(struct commit_list *list)
 224 {
 225         struct object_list *objects = NULL, **p = &objects, *pending;
 226         while (list) {
 227                 struct commit *commit = pop_most_recent_commit(&list, SEEN);
 228
 229                 p = process_tree(commit->tree, p, "");
 230                 if (process_commit(commit) == STOP)
 231                         break;
 232         }
 233         for (pending = pending_objects; pending; pending = pending->next) {
 234                 struct object *obj = pending->item;
 235                 const char *name = pending->name;
 236                 if (obj->flags & (UNINTERESTING | SEEN))
 237                         continue;
 238                 if (obj->type == tag_type) {
 239                         obj->flags |= SEEN;
 240                         p = add_object(obj, p, name);
 241                         continue;
 242                 }
 243                 if (obj->type == tree_type) {
 244                         p = process_tree((struct tree *)obj, p, name);
 245                         continue;
 246                 }
 247                 if (obj->type == blob_type) {
 248                         p = process_blob((struct blob *)obj, p, name);
 249                         continue;
 250                 }
 251                 die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
 252         }
 253         while (objects) {
 254                 /* An object with name "foo\n0000000000000000000000000000000000000000"
 255                  * can be used confuse downstream git-pack-objects very badly.
 256                  */
 257                 const char *ep = strchr(objects->name, '\n');
 258                 if (ep) {
 259                         printf("%s %.*s\n", sha1_to_hex(objects->item->sha1),
 260                                (int) (ep - objects->name),
 261                                objects->name);
 262                 }
 263                 else
 264                         printf("%s %s\n", sha1_to_hex(objects->item->sha1), objects->name);
 265                 objects = objects->next;
 266         }
 267 }
 268
 269 static void mark_blob_uninteresting(struct blob *blob)
 270 {
 271         if (!blob_objects)
 272                 return;
 273         if (blob->object.flags & UNINTERESTING)
 274                 return;
 275         blob->object.flags |= UNINTERESTING;
 276 }
 277
 278 static void mark_tree_uninteresting(struct tree *tree)
 279 {
 280         struct object *obj = &tree->object;
 281         struct tree_entry_list *entry;
 282
 283         if (!tree_objects)
 284                 return;
 285         if (obj->flags & UNINTERESTING)
 286                 return;
 287         obj->flags |= UNINTERESTING;
 288         if (!has_sha1_file(obj->sha1))
 289                 return;
 290         if (parse_tree(tree) < 0)
 291                 die("bad tree %s", sha1_to_hex(obj->sha1));
 292         entry = tree->entries;
 293         tree->entries = NULL;
 294         while (entry) {
 295                 struct tree_entry_list *next = entry->next;
 296                 if (entry->directory)
 297                         mark_tree_uninteresting(entry->item.tree);
 298                 else
 299                         mark_blob_uninteresting(entry->item.blob);
 300                 free(entry);
 301                 entry = next;
 302         }
 303 }
 304
 305 static void mark_parents_uninteresting(struct commit *commit)
 306 {
 307         struct commit_list *parents = commit->parents;
 308
 309         while (parents) {
 310                 struct commit *commit = parents->item;
 311                 commit->object.flags |= UNINTERESTING;
 312
 313                 /*
 314                  * Normally we haven't parsed the parent
 315                  * yet, so we won't have a parent of a parent
 316                  * here. However, it may turn out that we've
 317                  * reached this commit some other way (where it
 318                  * wasn't uninteresting), in which case we need
 319                  * to mark its parents recursively too..
 320                  */
 321                 if (commit->parents)
 322                         mark_parents_uninteresting(commit);
 323
 324                 /*
 325                  * A missing commit is ok iff its parent is marked
 326                  * uninteresting.
 327                  *
 328                  * We just mark such a thing parsed, so that when
 329                  * it is popped next time around, we won't be trying
 330                  * to parse it and get an error.
 331                  */
 332                 if (!has_sha1_file(commit->object.sha1))
 333                         commit->object.parsed = 1;
 334                 parents = parents->next;
 335         }
 336 }
 337
 338 static int everybody_uninteresting(struct commit_list *orig)
 339 {
 340         struct commit_list *list = orig;
 341         while (list) {
 342                 struct commit *commit = list->item;
 343                 list = list->next;
 344                 if (commit->object.flags & UNINTERESTING)
 345                         continue;
 346                 return 0;
 347         }
 348         return 1;
 349 }
 350
 351 /*
 352  * This is a truly stupid algorithm, but it's only
 353  * used for bisection, and we just don't care enough.
 354  *
 355  * We care just barely enough to avoid recursing for
 356  * non-merge entries.
 357  */
 358 static int count_distance(struct commit_list *entry)
 359 {
 360         int nr = 0;
 361
 362         while (entry) {
 363                 struct commit *commit = entry->item;
 364                 struct commit_list *p;
 365
 366                 if (commit->object.flags & (UNINTERESTING | COUNTED))
 367                         break;
 368                 if (!paths || (commit->object.flags & TREECHANGE))
 369                         nr++;
 370                 commit->object.flags |= COUNTED;
 371                 p = commit->parents;
 372                 entry = p;
 373                 if (p) {
 374                         p = p->next;
 375                         while (p) {
 376                                 nr += count_distance(p);
 377                                 p = p->next;
 378                         }
 379                 }
 380         }
 381
 382         return nr;
 383 }
 384
 385 static void clear_distance(struct commit_list *list)
 386 {
 387         while (list) {
 388                 struct commit *commit = list->item;
 389                 commit->object.flags &= ~COUNTED;
 390                 list = list->next;
 391         }
 392 }
 393
 394 static struct commit_list *find_bisection(struct commit_list *list)
 395 {
 396         int nr, closest;
 397         struct commit_list *p, *best;
 398
 399         nr = 0;
 400         p = list;
 401         while (p) {
 402                 if (!paths || (p->item->object.flags & TREECHANGE))
 403                         nr++;
 404                 p = p->next;
 405         }
 406         closest = 0;
 407         best = list;
 408
 409         for (p = list; p; p = p->next) {
 410                 int distance;
 411
 412                 if (paths && !(p->item->object.flags & TREECHANGE))
 413                         continue;
 414
 415                 distance = count_distance(p);
 416                 clear_distance(list);
 417                 if (nr - distance < distance)
 418                         distance = nr - distance;
 419                 if (distance > closest) {
 420                         best = p;
 421                         closest = distance;
 422                 }
 423         }
 424         if (best)
 425                 best->next = NULL;
 426         return best;
 427 }
 428
 429 static void mark_edges_uninteresting(struct commit_list *list)
 430 {
 431         for ( ; list; list = list->next) {
 432                 struct commit_list *parents = list->item->parents;
 433
 434                 for ( ; parents; parents = parents->next) {
 435                         struct commit *commit = parents->item;
 436                         if (commit->object.flags & UNINTERESTING)
 437                                 mark_tree_uninteresting(commit->tree);
 438                 }
 439         }
 440 }
 441
 442 #define TREE_SAME       0
 443 #define TREE_NEW        1
 444 #define TREE_DIFFERENT  2
 445 static int tree_difference = TREE_SAME;
 446
 447 static void file_add_remove(struct diff_options *options,
 448                     int addremove, unsigned mode,
 449                     const unsigned char *sha1,
 450                     const char *base, const char *path)
 451 {
 452         int diff = TREE_DIFFERENT;
 453
 454         /*
 455          * Is it an add of a new file? It means that
 456          * the old tree didn't have it at all, so we
 457          * will turn "TREE_SAME" -> "TREE_NEW", but
 458          * leave any "TREE_DIFFERENT" alone (and if
 459          * it already was "TREE_NEW", we'll keep it
 460          * "TREE_NEW" of course).
 461          */
 462         if (addremove == '+') {
 463                 diff = tree_difference;
 464                 if (diff != TREE_SAME)
 465                         return;
 466                 diff = TREE_NEW;
 467         }
 468         tree_difference = diff;
 469 }
 470
 471 static void file_change(struct diff_options *options,
 472                  unsigned old_mode, unsigned new_mode,
 473                  const unsigned char *old_sha1,
 474                  const unsigned char *new_sha1,
 475                  const char *base, const char *path)
 476 {
 477         tree_difference = TREE_DIFFERENT;
 478 }
 479
 480 static struct diff_options diff_opt = {
 481         .recursive = 1,
 482         .add_remove = file_add_remove,
 483         .change = file_change,
 484 };
 485
 486 static int compare_tree(struct tree *t1, struct tree *t2)
 487 {
 488         if (!t1)
 489                 return TREE_NEW;
 490         if (!t2)
 491                 return TREE_DIFFERENT;
 492         tree_difference = TREE_SAME;
 493         if (diff_tree_sha1(t1->object.sha1, t2->object.sha1, "", &diff_opt) < 0)
 494                 return TREE_DIFFERENT;
 495         return tree_difference;
 496 }
 497
 498 static int same_tree_as_empty(struct tree *t1)
 499 {
 500         int retval;
 501         void *tree;
 502         struct tree_desc empty, real;
 503
 504         if (!t1)
 505                 return 0;
 506
 507         tree = read_object_with_reference(t1->object.sha1, "tree", &real.size, NULL);
 508         if (!tree)
 509                 return 0;
 510         real.buf = tree;
 511
 512         empty.buf = "";
 513         empty.size = 0;
 514
 515         tree_difference = 0;
 516         retval = diff_tree(&empty, &real, "", &diff_opt);
 517         free(tree);
 518
 519         return retval >= 0 && !tree_difference;
 520 }
 521
 522 static void try_to_simplify_commit(struct commit *commit)
 523 {
 524         struct commit_list **pp, *parent;
 525
 526         if (!commit->tree)
 527                 return;
 528
 529         if (!commit->parents) {
 530                 if (!same_tree_as_empty(commit->tree))
 531                         commit->object.flags |= TREECHANGE;
 532                 return;
 533         }
 534
 535         pp = &commit->parents;
 536         while ((parent = *pp) != NULL) {
 537                 struct commit *p = parent->item;
 538
 539                 if (p->object.flags & UNINTERESTING) {
 540                         pp = &parent->next;
 541                         continue;
 542                 }
 543
 544                 parse_commit(p);
 545                 switch (compare_tree(p->tree, commit->tree)) {
 546                 case TREE_SAME:
 547                         parent->next = NULL;
 548                         commit->parents = parent;
 549                         return;
 550
 551                 case TREE_NEW:
 552                         if (remove_empty_trees && same_tree_as_empty(p->tree)) {
 553                                 *pp = parent->next;
 554                                 continue;
 555                         }
 556                 /* fallthrough */
 557                 case TREE_DIFFERENT:
 558                         pp = &parent->next;
 559                         continue;
 560                 }
 561                 die("bad tree compare for commit %s", sha1_to_hex(commit->object.sha1));
 562         }
 563         commit->object.flags |= TREECHANGE;
 564 }
 565
 566 static void add_parents_to_list(struct commit *commit, struct commit_list **list)
 567 {
 568         struct commit_list *parent = commit->parents;
 569
 570         /*
 571          * If the commit is uninteresting, don't try to
 572          * prune parents - we want the maximal uninteresting
 573          * set.
 574          *
 575          * Normally we haven't parsed the parent
 576          * yet, so we won't have a parent of a parent
 577          * here. However, it may turn out that we've
 578          * reached this commit some other way (where it
 579          * wasn't uninteresting), in which case we need
 580          * to mark its parents recursively too..
 581          */
 582         if (commit->object.flags & UNINTERESTING) {
 583                 while (parent) {
 584                         struct commit *p = parent->item;
 585                         parent = parent->next;
 586                         parse_commit(p);
 587                         p->object.flags |= UNINTERESTING;
 588                         if (p->parents)
 589                                 mark_parents_uninteresting(p);
 590                         if (p->object.flags & SEEN)
 591                                 continue;
 592                         p->object.flags |= SEEN;
 593                         insert_by_date(p, list);
 594                 }
 595                 return;
 596         }
 597
 598         /*
 599          * Ok, the commit wasn't uninteresting. Try to
 600          * simplify the commit history and find the parent
 601          * that has no differences in the path set if one exists.
 602          */
 603         if (paths)
 604                 try_to_simplify_commit(commit);
 605
 606         parent = commit->parents;
 607         while (parent) {
 608                 struct commit *p = parent->item;
 609
 610                 parent = parent->next;
 611
 612                 parse_commit(p);
 613                 if (p->object.flags & SEEN)
 614                         continue;
 615                 p->object.flags |= SEEN;
 616                 insert_by_date(p, list);
 617         }
 618 }
 619
 620 static struct commit_list *limit_list(struct commit_list *list)
 621 {
 622         struct commit_list *newlist = NULL;
 623         struct commit_list **p = &newlist;
 624         while (list) {
 625                 struct commit_list *entry = list;
 626                 struct commit *commit = list->item;
 627                 struct object *obj = &commit->object;
 628
 629                 list = list->next;
 630                 free(entry);
 631
 632                 if (max_age != -1 && (commit->date < max_age))
 633                         obj->flags |= UNINTERESTING;
 634                 if (unpacked && has_sha1_pack(obj->sha1))
 635                         obj->flags |= UNINTERESTING;
 636                 add_parents_to_list(commit, &list);
 637                 if (obj->flags & UNINTERESTING) {
 638                         mark_parents_uninteresting(commit);
 639                         if (everybody_uninteresting(list))
 640                                 break;
 641                         continue;
 642                 }
 643                 if (min_age != -1 && (commit->date > min_age))
 644                         continue;
 645                 p = &commit_list_insert(commit, p)->next;
 646         }
 647         if (tree_objects)
 648                 mark_edges_uninteresting(newlist);
 649         if (bisect_list)
 650                 newlist = find_bisection(newlist);
 651         return newlist;
 652 }
 653
 654 static void add_pending_object(struct object *obj, const char *name)
 655 {
 656         add_object(obj, &pending_objects, name);
 657 }
 658
 659 static struct commit *get_commit_reference(const char *name, const unsigned char *sha1, unsigned int flags)
 660 {
 661         struct object *object;
 662
 663         object = parse_object(sha1);
 664         if (!object)
 665                 die("bad object %s", name);
 666
 667         /*
 668          * Tag object? Look what it points to..
 669          */
 670         while (object->type == tag_type) {
 671                 struct tag *tag = (struct tag *) object;
 672                 object->flags |= flags;
 673                 if (tag_objects && !(object->flags & UNINTERESTING))
 674                         add_pending_object(object, tag->tag);
 675                 object = parse_object(tag->tagged->sha1);
 676                 if (!object)
 677                         die("bad object %s", sha1_to_hex(tag->tagged->sha1));
 678         }
 679
 680         /*
 681          * Commit object? Just return it, we'll do all the complex
 682          * reachability crud.
 683          */
 684         if (object->type == commit_type) {
 685                 struct commit *commit = (struct commit *)object;
 686                 object->flags |= flags;
 687                 if (parse_commit(commit) < 0)
 688                         die("unable to parse commit %s", name);
 689                 if (flags & UNINTERESTING)
 690                         mark_parents_uninteresting(commit);
 691                 return commit;
 692         }
 693
 694         /*
 695          * Tree object? Either mark it uniniteresting, or add it
 696          * to the list of objects to look at later..
 697          */
 698         if (object->type == tree_type) {
 699                 struct tree *tree = (struct tree *)object;
 700                 if (!tree_objects)
 701                         return NULL;
 702                 if (flags & UNINTERESTING) {
 703                         mark_tree_uninteresting(tree);
 704                         return NULL;
 705                 }
 706                 add_pending_object(object, "");
 707                 return NULL;
 708         }
 709
 710         /*
 711          * Blob object? You know the drill by now..
 712          */
 713         if (object->type == blob_type) {
 714                 struct blob *blob = (struct blob *)object;
 715                 if (!blob_objects)
 716                         return NULL;
 717                 if (flags & UNINTERESTING) {
 718                         mark_blob_uninteresting(blob);
 719                         return NULL;
 720                 }
 721                 add_pending_object(object, "");
 722                 return NULL;
 723         }
 724         die("%s is unknown object", name);
 725 }
 726
 727 static void handle_one_commit(struct commit *com, struct commit_list **lst)
 728 {
 729         if (!com || com->object.flags & SEEN)
 730                 return;
 731         com->object.flags |= SEEN;
 732         commit_list_insert(com, lst);
 733 }
 734
 735 /* for_each_ref() callback does not allow user data -- Yuck. */
 736 static struct commit_list **global_lst;
 737
 738 static int include_one_commit(const char *path, const unsigned char *sha1)
 739 {
 740         struct commit *com = get_commit_reference(path, sha1, 0);
 741         handle_one_commit(com, global_lst);
 742         return 0;
 743 }
 744
 745 static void handle_all(struct commit_list **lst)
 746 {
 747         global_lst = lst;
 748         for_each_ref(include_one_commit);
 749         global_lst = NULL;
 750 }
 751
 752 int main(int argc, const char **argv)
 753 {
 754         const char *prefix = setup_git_directory();
 755         struct commit_list *list = NULL;
 756         int i, limited = 0;
 757
 758         for (i = 1 ; i < argc; i++) {
 759                 int flags;
 760                 const char *arg = argv[i];
 761                 char *dotdot;
 762                 struct commit *commit;
 763                 unsigned char sha1[20];
 764
 765                 /* accept -<digit>, like traditilnal "head" */
 766                 if ((*arg == '-') && isdigit(arg[1])) {
 767                         max_count = atoi(arg + 1);
 768                         continue;
 769                 }
 770                 if (!strcmp(arg, "-n")) {
 771                         if (++i >= argc)
 772                                 die("-n requires an argument");
 773                         max_count = atoi(argv[i]);
 774                         continue;
 775                 }
 776                 if (!strncmp(arg,"-n",2)) {
 777                         max_count = atoi(arg + 2);
 778                         continue;
 779                 }
 780                 if (!strncmp(arg, "--max-count=", 12)) {
 781                         max_count = atoi(arg + 12);
 782                         continue;
 783                 }
 784                 if (!strncmp(arg, "--max-age=", 10)) {
 785                         max_age = atoi(arg + 10);
 786                         limited = 1;
 787                         continue;
 788                 }
 789                 if (!strncmp(arg, "--min-age=", 10)) {
 790                         min_age = atoi(arg + 10);
 791                         limited = 1;
 792                         continue;
 793                 }
 794                 if (!strcmp(arg, "--header")) {
 795                         verbose_header = 1;
 796                         continue;
 797                 }
 798                 if (!strncmp(arg, "--pretty", 8)) {
 799                         commit_format = get_commit_format(arg+8);
 800                         verbose_header = 1;
 801                         hdr_termination = '\n';
 802                         if (commit_format == CMIT_FMT_ONELINE)
 803                                 commit_prefix = "";
 804                         else
 805                                 commit_prefix = "commit ";
 806                         continue;
 807                 }
 808                 if (!strncmp(arg, "--no-merges", 11)) {
 809                         no_merges = 1;
 810                         continue;
 811                 }
 812                 if (!strcmp(arg, "--parents")) {
 813                         show_parents = 1;
 814                         continue;
 815                 }
 816                 if (!strcmp(arg, "--bisect")) {
 817                         bisect_list = 1;
 818                         continue;
 819                 }
 820                 if (!strcmp(arg, "--all")) {
 821                         handle_all(&list);
 822                         continue;
 823                 }
 824                 if (!strcmp(arg, "--objects")) {
 825                         tag_objects = 1;
 826                         tree_objects = 1;
 827                         blob_objects = 1;
 828                         continue;
 829                 }
 830                 if (!strcmp(arg, "--unpacked")) {
 831                         unpacked = 1;
 832                         limited = 1;
 833                         continue;
 834                 }
 835                 if (!strcmp(arg, "--merge-order")) {
 836                         merge_order = 1;
 837                         continue;
 838                 }
 839                 if (!strcmp(arg, "--show-breaks")) {
 840                         show_breaks = 1;
 841                         continue;
 842                 }
 843                 if (!strcmp(arg, "--topo-order")) {
 844                         topo_order = 1;
 845                         limited = 1;
 846                         continue;
 847                 }
 848                 if (!strcmp(arg, "--dense")) {
 849                         dense = 1;
 850                         continue;
 851                 }
 852                 if (!strcmp(arg, "--sparse")) {
 853                         dense = 0;
 854                         continue;
 855                 }
 856                 if (!strcmp(arg, "--remove-empty")) {
 857                         remove_empty_trees = 1;
 858                         continue;
 859                 }
 860                 if (!strcmp(arg, "--")) {
 861                         i++;
 862                         break;
 863                 }
 864
 865                 if (show_breaks && !merge_order)
 866                         usage(rev_list_usage);
 867
 868                 flags = 0;
 869                 dotdot = strstr(arg, "..");
 870                 if (dotdot) {
 871                         unsigned char from_sha1[20];
 872                         char *next = dotdot + 2;
 873                         *dotdot = 0;
 874                         if (!*next)
 875                                 next = "HEAD";
 876                         if (!get_sha1(arg, from_sha1) && !get_sha1(next, sha1)) {
 877                                 struct commit *exclude;
 878                                 struct commit *include;
 879
 880                                 exclude = get_commit_reference(arg, from_sha1, UNINTERESTING);
 881                                 include = get_commit_reference(next, sha1, 0);
 882                                 if (!exclude || !include)
 883                                         die("Invalid revision range %s..%s", arg, next);
 884                                 limited = 1;
 885                                 handle_one_commit(exclude, &list);
 886                                 handle_one_commit(include, &list);
 887                                 continue;
 888                         }
 889                         *dotdot = '.';
 890                 }
 891                 if (*arg == '^') {
 892                         flags = UNINTERESTING;
 893                         arg++;
 894                         limited = 1;
 895                 }
 896                 if (get_sha1(arg, sha1) < 0) {
 897                         struct stat st;
 898                         if (lstat(arg, &st) < 0)
 899                                 die("'%s': %s", arg, strerror(errno));
 900                         break;
 901                 }
 902                 commit = get_commit_reference(arg, sha1, flags);
 903                 handle_one_commit(commit, &list);
 904         }
 905
 906         if (!list &&
 907             (!(tag_objects||tree_objects||blob_objects) && !pending_objects))
 908                 usage(rev_list_usage);
 909
 910         paths = get_pathspec(prefix, argv + i);
 911         if (paths) {
 912                 limited = 1;
 913                 diff_tree_setup_paths(paths);
 914         }
 915
 916         save_commit_buffer = verbose_header;
 917         track_object_refs = 0;
 918
 919         if (!merge_order) {
 920                 sort_by_date(&list);
 921                 if (list && !limited && max_count == 1 &&
 922                     !tag_objects && !tree_objects && !blob_objects) {
 923                         show_commit(list->item);
 924                         return 0;
 925                 }
 926                 if (limited)
 927                         list = limit_list(list);
 928                 if (topo_order)
 929                         sort_in_topological_order(&list);
 930                 show_commit_list(list);
 931         } else {
 932 #ifndef NO_OPENSSL
 933                 if (sort_list_in_merge_order(list, &process_commit)) {
 934                         die("merge order sort failed\n");
 935                 }
 936 #else
 937                 die("merge order sort unsupported, OpenSSL not linked");
 938 #endif
 939         }
 940
 941         return 0;
 942 }