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 "    --date-order\n"
  31 "  formatting output:\n"
  32 "    --parents\n"
  33 "    --objects | --objects-edge\n"
  34 "    --unpacked\n"
  35 "    --header | --pretty\n"
  36 "    --abbrev=nr | --no-abbrev\n"
  37 "  special purpose:\n"
  38 "    --bisect"
  39 ;
  40
  41 static int dense = 1;
  42 static int unpacked = 0;
  43 static int bisect_list = 0;
  44 static int tag_objects = 0;
  45 static int tree_objects = 0;
  46 static int blob_objects = 0;
  47 static int edge_hint = 0;
  48 static int verbose_header = 0;
  49 static int abbrev = DEFAULT_ABBREV;
  50 static int show_parents = 0;
  51 static int hdr_termination = 0;
  52 static const char *commit_prefix = "";
  53 static unsigned long max_age = -1;
  54 static unsigned long min_age = -1;
  55 static int max_count = -1;
  56 static enum cmit_fmt commit_format = CMIT_FMT_RAW;
  57 static int merge_order = 0;
  58 static int show_breaks = 0;
  59 static int stop_traversal = 0;
  60 static int topo_order = 0;
  61 static int lifo = 1;
  62 static int no_merges = 0;
  63 static const char **paths = NULL;
  64 static int remove_empty_trees = 0;
  65
  66 static void show_commit(struct commit *commit)
  67 {
  68         commit->object.flags |= SHOWN;
  69         if (show_breaks) {
  70                 commit_prefix = "| ";
  71                 if (commit->object.flags & DISCONTINUITY) {
  72                         commit_prefix = "^ ";
  73                 } else if (commit->object.flags & BOUNDARY) {
  74                         commit_prefix = "= ";
  75                 }
  76         }
  77         printf("%s%s", commit_prefix, sha1_to_hex(commit->object.sha1));
  78         if (show_parents) {
  79                 struct commit_list *parents = commit->parents;
  80                 while (parents) {
  81                         struct object *o = &(parents->item->object);
  82                         parents = parents->next;
  83                         if (o->flags & TMP_MARK)
  84                                 continue;
  85                         printf(" %s", sha1_to_hex(o->sha1));
  86                         o->flags |= TMP_MARK;
  87                 }
  88                 /* TMP_MARK is a general purpose flag that can
  89                  * be used locally, but the user should clean
  90                  * things up after it is done with them.
  91                  */
  92                 for (parents = commit->parents;
  93                      parents;
  94                      parents = parents->next)
  95                         parents->item->object.flags &= ~TMP_MARK;
  96         }
  97         if (commit_format == CMIT_FMT_ONELINE)
  98                 putchar(' ');
  99         else
 100                 putchar('\n');
 101
 102         if (verbose_header) {
 103                 static char pretty_header[16384];
 104                 pretty_print_commit(commit_format, commit, ~0, pretty_header, sizeof(pretty_header), abbrev);
 105                 printf("%s%c", pretty_header, hdr_termination);
 106         }
 107         fflush(stdout);
 108 }
 109
 110 static int rewrite_one(struct commit **pp)
 111 {
 112         for (;;) {
 113                 struct commit *p = *pp;
 114                 if (p->object.flags & (TREECHANGE | UNINTERESTING))
 115                         return 0;
 116                 if (!p->parents)
 117                         return -1;
 118                 *pp = p->parents->item;
 119         }
 120 }
 121
 122 static void rewrite_parents(struct commit *commit)
 123 {
 124         struct commit_list **pp = &commit->parents;
 125         while (*pp) {
 126                 struct commit_list *parent = *pp;
 127                 if (rewrite_one(&parent->item) < 0) {
 128                         *pp = parent->next;
 129                         continue;
 130                 }
 131                 pp = &parent->next;
 132         }
 133 }
 134
 135 static int filter_commit(struct commit * commit)
 136 {
 137         if (stop_traversal && (commit->object.flags & BOUNDARY))
 138                 return STOP;
 139         if (commit->object.flags & (UNINTERESTING|SHOWN))
 140                 return CONTINUE;
 141         if (min_age != -1 && (commit->date > min_age))
 142                 return CONTINUE;
 143         if (max_age != -1 && (commit->date < max_age)) {
 144                 stop_traversal=1;
 145                 return CONTINUE;
 146         }
 147         if (no_merges && (commit->parents && commit->parents->next))
 148                 return CONTINUE;
 149         if (paths && dense) {
 150                 if (!(commit->object.flags & TREECHANGE))
 151                         return CONTINUE;
 152                 rewrite_parents(commit);
 153         }
 154         return DO;
 155 }
 156
 157 static int process_commit(struct commit * commit)
 158 {
 159         int action=filter_commit(commit);
 160
 161         if (action == STOP) {
 162                 return STOP;
 163         }
 164
 165         if (action == CONTINUE) {
 166                 return CONTINUE;
 167         }
 168
 169         if (max_count != -1 && !max_count--)
 170                 return STOP;
 171
 172         show_commit(commit);
 173
 174         return CONTINUE;
 175 }
 176
 177 static struct object_list **add_object(struct object *obj, struct object_list **p, const char *name)
 178 {
 179         struct object_list *entry = xmalloc(sizeof(*entry));
 180         entry->item = obj;
 181         entry->next = *p;
 182         entry->name = name;
 183         *p = entry;
 184         return &entry->next;
 185 }
 186
 187 static struct object_list **process_blob(struct blob *blob, struct object_list **p, const char *name)
 188 {
 189         struct object *obj = &blob->object;
 190
 191         if (!blob_objects)
 192                 return p;
 193         if (obj->flags & (UNINTERESTING | SEEN))
 194                 return p;
 195         obj->flags |= SEEN;
 196         return add_object(obj, p, name);
 197 }
 198
 199 static struct object_list **process_tree(struct tree *tree, struct object_list **p, const char *name)
 200 {
 201         struct object *obj = &tree->object;
 202         struct tree_entry_list *entry;
 203
 204         if (!tree_objects)
 205                 return p;
 206         if (obj->flags & (UNINTERESTING | SEEN))
 207                 return p;
 208         if (parse_tree(tree) < 0)
 209                 die("bad tree object %s", sha1_to_hex(obj->sha1));
 210         obj->flags |= SEEN;
 211         p = add_object(obj, p, name);
 212         entry = tree->entries;
 213         tree->entries = NULL;
 214         while (entry) {
 215                 struct tree_entry_list *next = entry->next;
 216                 if (entry->directory)
 217                         p = process_tree(entry->item.tree, p, entry->name);
 218                 else
 219                         p = process_blob(entry->item.blob, p, entry->name);
 220                 free(entry);
 221                 entry = next;
 222         }
 223         return p;
 224 }
 225
 226 static struct object_list *pending_objects = NULL;
 227
 228 static void show_commit_list(struct commit_list *list)
 229 {
 230         struct object_list *objects = NULL, **p = &objects, *pending;
 231         while (list) {
 232                 struct commit *commit = pop_most_recent_commit(&list, SEEN);
 233
 234                 p = process_tree(commit->tree, p, "");
 235                 if (process_commit(commit) == STOP)
 236                         break;
 237         }
 238         for (pending = pending_objects; pending; pending = pending->next) {
 239                 struct object *obj = pending->item;
 240                 const char *name = pending->name;
 241                 if (obj->flags & (UNINTERESTING | SEEN))
 242                         continue;
 243                 if (obj->type == tag_type) {
 244                         obj->flags |= SEEN;
 245                         p = add_object(obj, p, name);
 246                         continue;
 247                 }
 248                 if (obj->type == tree_type) {
 249                         p = process_tree((struct tree *)obj, p, name);
 250                         continue;
 251                 }
 252                 if (obj->type == blob_type) {
 253                         p = process_blob((struct blob *)obj, p, name);
 254                         continue;
 255                 }
 256                 die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
 257         }
 258         while (objects) {
 259                 /* An object with name "foo\n0000000000000000000000000000000000000000"
 260                  * can be used confuse downstream git-pack-objects very badly.
 261                  */
 262                 const char *ep = strchr(objects->name, '\n');
 263                 if (ep) {
 264                         printf("%s %.*s\n", sha1_to_hex(objects->item->sha1),
 265                                (int) (ep - objects->name),
 266                                objects->name);
 267                 }
 268                 else
 269                         printf("%s %s\n", sha1_to_hex(objects->item->sha1), objects->name);
 270                 objects = objects->next;
 271         }
 272 }
 273
 274 static void mark_blob_uninteresting(struct blob *blob)
 275 {
 276         if (!blob_objects)
 277                 return;
 278         if (blob->object.flags & UNINTERESTING)
 279                 return;
 280         blob->object.flags |= UNINTERESTING;
 281 }
 282
 283 static void mark_tree_uninteresting(struct tree *tree)
 284 {
 285         struct object *obj = &tree->object;
 286         struct tree_entry_list *entry;
 287
 288         if (!tree_objects)
 289                 return;
 290         if (obj->flags & UNINTERESTING)
 291                 return;
 292         obj->flags |= UNINTERESTING;
 293         if (!has_sha1_file(obj->sha1))
 294                 return;
 295         if (parse_tree(tree) < 0)
 296                 die("bad tree %s", sha1_to_hex(obj->sha1));
 297         entry = tree->entries;
 298         tree->entries = NULL;
 299         while (entry) {
 300                 struct tree_entry_list *next = entry->next;
 301                 if (entry->directory)
 302                         mark_tree_uninteresting(entry->item.tree);
 303                 else
 304                         mark_blob_uninteresting(entry->item.blob);
 305                 free(entry);
 306                 entry = next;
 307         }
 308 }
 309
 310 static void mark_parents_uninteresting(struct commit *commit)
 311 {
 312         struct commit_list *parents = commit->parents;
 313
 314         while (parents) {
 315                 struct commit *commit = parents->item;
 316                 commit->object.flags |= UNINTERESTING;
 317
 318                 /*
 319                  * Normally we haven't parsed the parent
 320                  * yet, so we won't have a parent of a parent
 321                  * here. However, it may turn out that we've
 322                  * reached this commit some other way (where it
 323                  * wasn't uninteresting), in which case we need
 324                  * to mark its parents recursively too..
 325                  */
 326                 if (commit->parents)
 327                         mark_parents_uninteresting(commit);
 328
 329                 /*
 330                  * A missing commit is ok iff its parent is marked
 331                  * uninteresting.
 332                  *
 333                  * We just mark such a thing parsed, so that when
 334                  * it is popped next time around, we won't be trying
 335                  * to parse it and get an error.
 336                  */
 337                 if (!has_sha1_file(commit->object.sha1))
 338                         commit->object.parsed = 1;
 339                 parents = parents->next;
 340         }
 341 }
 342
 343 static int everybody_uninteresting(struct commit_list *orig)
 344 {
 345         struct commit_list *list = orig;
 346         while (list) {
 347                 struct commit *commit = list->item;
 348                 list = list->next;
 349                 if (commit->object.flags & UNINTERESTING)
 350                         continue;
 351                 return 0;
 352         }
 353         return 1;
 354 }
 355
 356 /*
 357  * This is a truly stupid algorithm, but it's only
 358  * used for bisection, and we just don't care enough.
 359  *
 360  * We care just barely enough to avoid recursing for
 361  * non-merge entries.
 362  */
 363 static int count_distance(struct commit_list *entry)
 364 {
 365         int nr = 0;
 366
 367         while (entry) {
 368                 struct commit *commit = entry->item;
 369                 struct commit_list *p;
 370
 371                 if (commit->object.flags & (UNINTERESTING | COUNTED))
 372                         break;
 373                 if (!paths || (commit->object.flags & TREECHANGE))
 374                         nr++;
 375                 commit->object.flags |= COUNTED;
 376                 p = commit->parents;
 377                 entry = p;
 378                 if (p) {
 379                         p = p->next;
 380                         while (p) {
 381                                 nr += count_distance(p);
 382                                 p = p->next;
 383                         }
 384                 }
 385         }
 386
 387         return nr;
 388 }
 389
 390 static void clear_distance(struct commit_list *list)
 391 {
 392         while (list) {
 393                 struct commit *commit = list->item;
 394                 commit->object.flags &= ~COUNTED;
 395                 list = list->next;
 396         }
 397 }
 398
 399 static struct commit_list *find_bisection(struct commit_list *list)
 400 {
 401         int nr, closest;
 402         struct commit_list *p, *best;
 403
 404         nr = 0;
 405         p = list;
 406         while (p) {
 407                 if (!paths || (p->item->object.flags & TREECHANGE))
 408                         nr++;
 409                 p = p->next;
 410         }
 411         closest = 0;
 412         best = list;
 413
 414         for (p = list; p; p = p->next) {
 415                 int distance;
 416
 417                 if (paths && !(p->item->object.flags & TREECHANGE))
 418                         continue;
 419
 420                 distance = count_distance(p);
 421                 clear_distance(list);
 422                 if (nr - distance < distance)
 423                         distance = nr - distance;
 424                 if (distance > closest) {
 425                         best = p;
 426                         closest = distance;
 427                 }
 428         }
 429         if (best)
 430                 best->next = NULL;
 431         return best;
 432 }
 433
 434 static void mark_edge_parents_uninteresting(struct commit *commit)
 435 {
 436         struct commit_list *parents;
 437
 438         for (parents = commit->parents; parents; parents = parents->next) {
 439                 struct commit *parent = parents->item;
 440                 if (!(parent->object.flags & UNINTERESTING))
 441                         continue;
 442                 mark_tree_uninteresting(parent->tree);
 443                 if (edge_hint && !(parent->object.flags & SHOWN)) {
 444                         parent->object.flags |= SHOWN;
 445                         printf("-%s\n", sha1_to_hex(parent->object.sha1));
 446                 }
 447         }
 448 }
 449
 450 static void mark_edges_uninteresting(struct commit_list *list)
 451 {
 452         for ( ; list; list = list->next) {
 453                 struct commit *commit = list->item;
 454
 455                 if (commit->object.flags & UNINTERESTING) {
 456                         mark_tree_uninteresting(commit->tree);
 457                         continue;
 458                 }
 459                 mark_edge_parents_uninteresting(commit);
 460         }
 461 }
 462
 463 #define TREE_SAME       0
 464 #define TREE_NEW        1
 465 #define TREE_DIFFERENT  2
 466 static int tree_difference = TREE_SAME;
 467
 468 static void file_add_remove(struct diff_options *options,
 469                     int addremove, unsigned mode,
 470                     const unsigned char *sha1,
 471                     const char *base, const char *path)
 472 {
 473         int diff = TREE_DIFFERENT;
 474
 475         /*
 476          * Is it an add of a new file? It means that
 477          * the old tree didn't have it at all, so we
 478          * will turn "TREE_SAME" -> "TREE_NEW", but
 479          * leave any "TREE_DIFFERENT" alone (and if
 480          * it already was "TREE_NEW", we'll keep it
 481          * "TREE_NEW" of course).
 482          */
 483         if (addremove == '+') {
 484                 diff = tree_difference;
 485                 if (diff != TREE_SAME)
 486                         return;
 487                 diff = TREE_NEW;
 488         }
 489         tree_difference = diff;
 490 }
 491
 492 static void file_change(struct diff_options *options,
 493                  unsigned old_mode, unsigned new_mode,
 494                  const unsigned char *old_sha1,
 495                  const unsigned char *new_sha1,
 496                  const char *base, const char *path)
 497 {
 498         tree_difference = TREE_DIFFERENT;
 499 }
 500
 501 static struct diff_options diff_opt = {
 502         .recursive = 1,
 503         .add_remove = file_add_remove,
 504         .change = file_change,
 505 };
 506
 507 static int compare_tree(struct tree *t1, struct tree *t2)
 508 {
 509         if (!t1)
 510                 return TREE_NEW;
 511         if (!t2)
 512                 return TREE_DIFFERENT;
 513         tree_difference = TREE_SAME;
 514         if (diff_tree_sha1(t1->object.sha1, t2->object.sha1, "", &diff_opt) < 0)
 515                 return TREE_DIFFERENT;
 516         return tree_difference;
 517 }
 518
 519 static int same_tree_as_empty(struct tree *t1)
 520 {
 521         int retval;
 522         void *tree;
 523         struct tree_desc empty, real;
 524
 525         if (!t1)
 526                 return 0;
 527
 528         tree = read_object_with_reference(t1->object.sha1, "tree", &real.size, NULL);
 529         if (!tree)
 530                 return 0;
 531         real.buf = tree;
 532
 533         empty.buf = "";
 534         empty.size = 0;
 535
 536         tree_difference = 0;
 537         retval = diff_tree(&empty, &real, "", &diff_opt);
 538         free(tree);
 539
 540         return retval >= 0 && !tree_difference;
 541 }
 542
 543 static void try_to_simplify_commit(struct commit *commit)
 544 {
 545         struct commit_list **pp, *parent;
 546
 547         if (!commit->tree)
 548                 return;
 549
 550         if (!commit->parents) {
 551                 if (!same_tree_as_empty(commit->tree))
 552                         commit->object.flags |= TREECHANGE;
 553                 return;
 554         }
 555
 556         pp = &commit->parents;
 557         while ((parent = *pp) != NULL) {
 558                 struct commit *p = parent->item;
 559
 560                 if (p->object.flags & UNINTERESTING) {
 561                         pp = &parent->next;
 562                         continue;
 563                 }
 564
 565                 parse_commit(p);
 566                 switch (compare_tree(p->tree, commit->tree)) {
 567                 case TREE_SAME:
 568                         parent->next = NULL;
 569                         commit->parents = parent;
 570                         return;
 571
 572                 case TREE_NEW:
 573                         if (remove_empty_trees && same_tree_as_empty(p->tree)) {
 574                                 *pp = parent->next;
 575                                 continue;
 576                         }
 577                 /* fallthrough */
 578                 case TREE_DIFFERENT:
 579                         pp = &parent->next;
 580                         continue;
 581                 }
 582                 die("bad tree compare for commit %s", sha1_to_hex(commit->object.sha1));
 583         }
 584         commit->object.flags |= TREECHANGE;
 585 }
 586
 587 static void add_parents_to_list(struct commit *commit, struct commit_list **list)
 588 {
 589         struct commit_list *parent = commit->parents;
 590
 591         /*
 592          * If the commit is uninteresting, don't try to
 593          * prune parents - we want the maximal uninteresting
 594          * set.
 595          *
 596          * Normally we haven't parsed the parent
 597          * yet, so we won't have a parent of a parent
 598          * here. However, it may turn out that we've
 599          * reached this commit some other way (where it
 600          * wasn't uninteresting), in which case we need
 601          * to mark its parents recursively too..
 602          */
 603         if (commit->object.flags & UNINTERESTING) {
 604                 while (parent) {
 605                         struct commit *p = parent->item;
 606                         parent = parent->next;
 607                         parse_commit(p);
 608                         p->object.flags |= UNINTERESTING;
 609                         if (p->parents)
 610                                 mark_parents_uninteresting(p);
 611                         if (p->object.flags & SEEN)
 612                                 continue;
 613                         p->object.flags |= SEEN;
 614                         insert_by_date(p, list);
 615                 }
 616                 return;
 617         }
 618
 619         /*
 620          * Ok, the commit wasn't uninteresting. Try to
 621          * simplify the commit history and find the parent
 622          * that has no differences in the path set if one exists.
 623          */
 624         if (paths)
 625                 try_to_simplify_commit(commit);
 626
 627         parent = commit->parents;
 628         while (parent) {
 629                 struct commit *p = parent->item;
 630
 631                 parent = parent->next;
 632
 633                 parse_commit(p);
 634                 if (p->object.flags & SEEN)
 635                         continue;
 636                 p->object.flags |= SEEN;
 637                 insert_by_date(p, list);
 638         }
 639 }
 640
 641 static struct commit_list *limit_list(struct commit_list *list)
 642 {
 643         struct commit_list *newlist = NULL;
 644         struct commit_list **p = &newlist;
 645         while (list) {
 646                 struct commit_list *entry = list;
 647                 struct commit *commit = list->item;
 648                 struct object *obj = &commit->object;
 649
 650                 list = list->next;
 651                 free(entry);
 652
 653                 if (max_age != -1 && (commit->date < max_age))
 654                         obj->flags |= UNINTERESTING;
 655                 if (unpacked && has_sha1_pack(obj->sha1))
 656                         obj->flags |= UNINTERESTING;
 657                 add_parents_to_list(commit, &list);
 658                 if (obj->flags & UNINTERESTING) {
 659                         mark_parents_uninteresting(commit);
 660                         if (everybody_uninteresting(list))
 661                                 break;
 662                         continue;
 663                 }
 664                 if (min_age != -1 && (commit->date > min_age))
 665                         continue;
 666                 p = &commit_list_insert(commit, p)->next;
 667         }
 668         if (tree_objects)
 669                 mark_edges_uninteresting(newlist);
 670         if (bisect_list)
 671                 newlist = find_bisection(newlist);
 672         return newlist;
 673 }
 674
 675 static void add_pending_object(struct object *obj, const char *name)
 676 {
 677         add_object(obj, &pending_objects, name);
 678 }
 679
 680 static struct commit *get_commit_reference(const char *name, const unsigned char *sha1, unsigned int flags)
 681 {
 682         struct object *object;
 683
 684         object = parse_object(sha1);
 685         if (!object)
 686                 die("bad object %s", name);
 687
 688         /*
 689          * Tag object? Look what it points to..
 690          */
 691         while (object->type == tag_type) {
 692                 struct tag *tag = (struct tag *) object;
 693                 object->flags |= flags;
 694                 if (tag_objects && !(object->flags & UNINTERESTING))
 695                         add_pending_object(object, tag->tag);
 696                 object = parse_object(tag->tagged->sha1);
 697                 if (!object)
 698                         die("bad object %s", sha1_to_hex(tag->tagged->sha1));
 699         }
 700
 701         /*
 702          * Commit object? Just return it, we'll do all the complex
 703          * reachability crud.
 704          */
 705         if (object->type == commit_type) {
 706                 struct commit *commit = (struct commit *)object;
 707                 object->flags |= flags;
 708                 if (parse_commit(commit) < 0)
 709                         die("unable to parse commit %s", name);
 710                 if (flags & UNINTERESTING)
 711                         mark_parents_uninteresting(commit);
 712                 return commit;
 713         }
 714
 715         /*
 716          * Tree object? Either mark it uniniteresting, or add it
 717          * to the list of objects to look at later..
 718          */
 719         if (object->type == tree_type) {
 720                 struct tree *tree = (struct tree *)object;
 721                 if (!tree_objects)
 722                         return NULL;
 723                 if (flags & UNINTERESTING) {
 724                         mark_tree_uninteresting(tree);
 725                         return NULL;
 726                 }
 727                 add_pending_object(object, "");
 728                 return NULL;
 729         }
 730
 731         /*
 732          * Blob object? You know the drill by now..
 733          */
 734         if (object->type == blob_type) {
 735                 struct blob *blob = (struct blob *)object;
 736                 if (!blob_objects)
 737                         return NULL;
 738                 if (flags & UNINTERESTING) {
 739                         mark_blob_uninteresting(blob);
 740                         return NULL;
 741                 }
 742                 add_pending_object(object, "");
 743                 return NULL;
 744         }
 745         die("%s is unknown object", name);
 746 }
 747
 748 static void handle_one_commit(struct commit *com, struct commit_list **lst)
 749 {
 750         if (!com || com->object.flags & SEEN)
 751                 return;
 752         com->object.flags |= SEEN;
 753         commit_list_insert(com, lst);
 754 }
 755
 756 /* for_each_ref() callback does not allow user data -- Yuck. */
 757 static struct commit_list **global_lst;
 758
 759 static int include_one_commit(const char *path, const unsigned char *sha1)
 760 {
 761         struct commit *com = get_commit_reference(path, sha1, 0);
 762         handle_one_commit(com, global_lst);
 763         return 0;
 764 }
 765
 766 static void handle_all(struct commit_list **lst)
 767 {
 768         global_lst = lst;
 769         for_each_ref(include_one_commit);
 770         global_lst = NULL;
 771 }
 772
 773 int main(int argc, const char **argv)
 774 {
 775         const char *prefix = setup_git_directory();
 776         struct commit_list *list = NULL;
 777         int i, limited = 0;
 778
 779         for (i = 1 ; i < argc; i++) {
 780                 int flags;
 781                 const char *arg = argv[i];
 782                 char *dotdot;
 783                 struct commit *commit;
 784                 unsigned char sha1[20];
 785
 786                 /* accept -<digit>, like traditilnal "head" */
 787                 if ((*arg == '-') && isdigit(arg[1])) {
 788                         max_count = atoi(arg + 1);
 789                         continue;
 790                 }
 791                 if (!strcmp(arg, "-n")) {
 792                         if (++i >= argc)
 793                                 die("-n requires an argument");
 794                         max_count = atoi(argv[i]);
 795                         continue;
 796                 }
 797                 if (!strncmp(arg,"-n",2)) {
 798                         max_count = atoi(arg + 2);
 799                         continue;
 800                 }
 801                 if (!strncmp(arg, "--max-count=", 12)) {
 802                         max_count = atoi(arg + 12);
 803                         continue;
 804                 }
 805                 if (!strncmp(arg, "--max-age=", 10)) {
 806                         max_age = atoi(arg + 10);
 807                         limited = 1;
 808                         continue;
 809                 }
 810                 if (!strncmp(arg, "--min-age=", 10)) {
 811                         min_age = atoi(arg + 10);
 812                         limited = 1;
 813                         continue;
 814                 }
 815                 if (!strcmp(arg, "--header")) {
 816                         verbose_header = 1;
 817                         continue;
 818                 }
 819                 if (!strcmp(arg, "--no-abbrev")) {
 820                         abbrev = 0;
 821                         continue;
 822                 }
 823                 if (!strncmp(arg, "--abbrev=", 9)) {
 824                         abbrev = strtoul(arg + 9, NULL, 10);
 825                         if (abbrev && abbrev < MINIMUM_ABBREV)
 826                                 abbrev = MINIMUM_ABBREV;
 827                         else if (40 < abbrev)
 828                                 abbrev = 40;
 829                         continue;
 830                 }
 831                 if (!strncmp(arg, "--pretty", 8)) {
 832                         commit_format = get_commit_format(arg+8);
 833                         verbose_header = 1;
 834                         hdr_termination = '\n';
 835                         if (commit_format == CMIT_FMT_ONELINE)
 836                                 commit_prefix = "";
 837                         else
 838                                 commit_prefix = "commit ";
 839                         continue;
 840                 }
 841                 if (!strncmp(arg, "--no-merges", 11)) {
 842                         no_merges = 1;
 843                         continue;
 844                 }
 845                 if (!strcmp(arg, "--parents")) {
 846                         show_parents = 1;
 847                         continue;
 848                 }
 849                 if (!strcmp(arg, "--bisect")) {
 850                         bisect_list = 1;
 851                         continue;
 852                 }
 853                 if (!strcmp(arg, "--all")) {
 854                         handle_all(&list);
 855                         continue;
 856                 }
 857                 if (!strcmp(arg, "--objects")) {
 858                         tag_objects = 1;
 859                         tree_objects = 1;
 860                         blob_objects = 1;
 861                         continue;
 862                 }
 863                 if (!strcmp(arg, "--objects-edge")) {
 864                         tag_objects = 1;
 865                         tree_objects = 1;
 866                         blob_objects = 1;
 867                         edge_hint = 1;
 868                         continue;
 869                 }
 870                 if (!strcmp(arg, "--unpacked")) {
 871                         unpacked = 1;
 872                         limited = 1;
 873                         continue;
 874                 }
 875                 if (!strcmp(arg, "--merge-order")) {
 876                         merge_order = 1;
 877                         continue;
 878                 }
 879                 if (!strcmp(arg, "--show-breaks")) {
 880                         show_breaks = 1;
 881                         continue;
 882                 }
 883                 if (!strcmp(arg, "--topo-order")) {
 884                         topo_order = 1;
 885                         lifo = 1;
 886                         limited = 1;
 887                         continue;
 888                 }
 889                 if (!strcmp(arg, "--date-order")) {
 890                         topo_order = 1;
 891                         lifo = 0;
 892                         limited = 1;
 893                         continue;
 894                 }
 895                 if (!strcmp(arg, "--dense")) {
 896                         dense = 1;
 897                         continue;
 898                 }
 899                 if (!strcmp(arg, "--sparse")) {
 900                         dense = 0;
 901                         continue;
 902                 }
 903                 if (!strcmp(arg, "--remove-empty")) {
 904                         remove_empty_trees = 1;
 905                         continue;
 906                 }
 907                 if (!strcmp(arg, "--")) {
 908                         i++;
 909                         break;
 910                 }
 911
 912                 if (show_breaks && !merge_order)
 913                         usage(rev_list_usage);
 914
 915                 flags = 0;
 916                 dotdot = strstr(arg, "..");
 917                 if (dotdot) {
 918                         unsigned char from_sha1[20];
 919                         char *next = dotdot + 2;
 920                         *dotdot = 0;
 921                         if (!*next)
 922                                 next = "HEAD";
 923                         if (!get_sha1(arg, from_sha1) && !get_sha1(next, sha1)) {
 924                                 struct commit *exclude;
 925                                 struct commit *include;
 926
 927                                 exclude = get_commit_reference(arg, from_sha1, UNINTERESTING);
 928                                 include = get_commit_reference(next, sha1, 0);
 929                                 if (!exclude || !include)
 930                                         die("Invalid revision range %s..%s", arg, next);
 931                                 limited = 1;
 932                                 handle_one_commit(exclude, &list);
 933                                 handle_one_commit(include, &list);
 934                                 continue;
 935                         }
 936                         *dotdot = '.';
 937                 }
 938                 if (*arg == '^') {
 939                         flags = UNINTERESTING;
 940                         arg++;
 941                         limited = 1;
 942                 }
 943                 if (get_sha1(arg, sha1) < 0) {
 944                         struct stat st;
 945                         if (lstat(arg, &st) < 0)
 946                                 die("'%s': %s", arg, strerror(errno));
 947                         break;
 948                 }
 949                 commit = get_commit_reference(arg, sha1, flags);
 950                 handle_one_commit(commit, &list);
 951         }
 952
 953         if (!list &&
 954             (!(tag_objects||tree_objects||blob_objects) && !pending_objects))
 955                 usage(rev_list_usage);
 956
 957         paths = get_pathspec(prefix, argv + i);
 958         if (paths) {
 959                 limited = 1;
 960                 diff_tree_setup_paths(paths);
 961         }
 962
 963         save_commit_buffer = verbose_header;
 964         track_object_refs = 0;
 965
 966         if (!merge_order) {
 967                 sort_by_date(&list);
 968                 if (list && !limited && max_count == 1 &&
 969                     !tag_objects && !tree_objects && !blob_objects) {
 970                         show_commit(list->item);
 971                         return 0;
 972                 }
 973                 if (limited)
 974                         list = limit_list(list);
 975                 if (topo_order)
 976                         sort_in_topological_order(&list, lifo);
 977                 show_commit_list(list);
 978         } else {
 979 #ifndef NO_OPENSSL
 980                 if (sort_list_in_merge_order(list, &process_commit)) {
 981                         die("merge order sort failed\n");
 982                 }
 983 #else
 984                 die("merge order sort unsupported, OpenSSL not linked");
 985 #endif
 986         }
 987
 988         return 0;
 989 }