rev-list.c

   1 #include "cache.h"
   2 #include "tag.h"
   3 #include "commit.h"
   4 #include "tree.h"
   5 #include "blob.h"
   6 #include "epoch.h"
   7
   8 #define SEEN            (1u << 0)
   9 #define INTERESTING     (1u << 1)
  10 #define COUNTED         (1u << 2)
  11 #define SHOWN           (1u << 3)
  12
  13 static const char rev_list_usage[] =
  14         "git-rev-list [OPTION] commit-id <commit-id>\n"
  15                       "  --max-count=nr\n"
  16                       "  --max-age=epoch\n"
  17                       "  --min-age=epoch\n"
  18                       "  --bisect\n"
  19                       "  --objects\n"
  20                       "  --unpacked\n"
  21                       "  --header\n"
  22                       "  --pretty\n"
  23                       "  --merge-order [ --show-breaks ]";
  24
  25 static int unpacked = 0;
  26 static int bisect_list = 0;
  27 static int tag_objects = 0;
  28 static int tree_objects = 0;
  29 static int blob_objects = 0;
  30 static int verbose_header = 0;
  31 static int show_parents = 0;
  32 static int hdr_termination = 0;
  33 static const char *prefix = "";
  34 static unsigned long max_age = -1;
  35 static unsigned long min_age = -1;
  36 static int max_count = -1;
  37 static enum cmit_fmt commit_format = CMIT_FMT_RAW;
  38 static int merge_order = 0;
  39 static int show_breaks = 0;
  40 static int stop_traversal = 0;
  41 static int topo_order = 0;
  42
  43 static void show_commit(struct commit *commit)
  44 {
  45         commit->object.flags |= SHOWN;
  46         if (show_breaks) {
  47                 prefix = "| ";
  48                 if (commit->object.flags & DISCONTINUITY) {
  49                         prefix = "^ ";
  50                 } else if (commit->object.flags & BOUNDARY) {
  51                         prefix = "= ";
  52                 }
  53         }
  54         printf("%s%s", prefix, sha1_to_hex(commit->object.sha1));
  55         if (show_parents) {
  56                 struct commit_list *parents = commit->parents;
  57                 while (parents) {
  58                         printf(" %s", sha1_to_hex(parents->item->object.sha1));
  59                         parents = parents->next;
  60                 }
  61         }
  62         putchar('\n');
  63         if (verbose_header) {
  64                 static char pretty_header[16384];
  65                 pretty_print_commit(commit_format, commit->buffer, ~0, pretty_header, sizeof(pretty_header));
  66                 printf("%s%c", pretty_header, hdr_termination);
  67         }
  68         fflush(stdout);
  69 }
  70
  71 static int filter_commit(struct commit * commit)
  72 {
  73         if (stop_traversal && (commit->object.flags & BOUNDARY))
  74                 return STOP;
  75         if (commit->object.flags & (UNINTERESTING|SHOWN))
  76                 return CONTINUE;
  77         if (min_age != -1 && (commit->date > min_age))
  78                 return CONTINUE;
  79         if (max_age != -1 && (commit->date < max_age)) {
  80                 stop_traversal=1;
  81                 return merge_order?CONTINUE:STOP;
  82         }
  83         if (max_count != -1 && !max_count--)
  84                 return STOP;
  85         return DO;
  86 }
  87
  88 static int process_commit(struct commit * commit)
  89 {
  90         int action=filter_commit(commit);
  91
  92         if (action == STOP) {
  93                 return STOP;
  94         }
  95
  96         if (action == CONTINUE) {
  97                 return CONTINUE;
  98         }
  99
 100         show_commit(commit);
 101
 102         return CONTINUE;
 103 }
 104
 105 static struct object_list **add_object(struct object *obj, struct object_list **p, const char *name)
 106 {
 107         struct object_list *entry = xmalloc(sizeof(*entry));
 108         entry->item = obj;
 109         entry->next = *p;
 110         entry->name = name;
 111         *p = entry;
 112         return &entry->next;
 113 }
 114
 115 static struct object_list **process_blob(struct blob *blob, struct object_list **p, const char *name)
 116 {
 117         struct object *obj = &blob->object;
 118
 119         if (!blob_objects)
 120                 return p;
 121         if (obj->flags & (UNINTERESTING | SEEN))
 122                 return p;
 123         obj->flags |= SEEN;
 124         return add_object(obj, p, name);
 125 }
 126
 127 static struct object_list **process_tree(struct tree *tree, struct object_list **p, const char *name)
 128 {
 129         struct object *obj = &tree->object;
 130         struct tree_entry_list *entry;
 131
 132         if (!tree_objects)
 133                 return p;
 134         if (obj->flags & (UNINTERESTING | SEEN))
 135                 return p;
 136         if (parse_tree(tree) < 0)
 137                 die("bad tree object %s", sha1_to_hex(obj->sha1));
 138         obj->flags |= SEEN;
 139         p = add_object(obj, p, name);
 140         for (entry = tree->entries ; entry ; entry = entry->next) {
 141                 if (entry->directory)
 142                         p = process_tree(entry->item.tree, p, entry->name);
 143                 else
 144                         p = process_blob(entry->item.blob, p, entry->name);
 145         }
 146         return p;
 147 }
 148
 149 static struct object_list *pending_objects = NULL;
 150
 151 static void show_commit_list(struct commit_list *list)
 152 {
 153         struct object_list *objects = NULL, **p = &objects, *pending;
 154         while (list) {
 155                 struct commit *commit = pop_most_recent_commit(&list, SEEN);
 156
 157                 p = process_tree(commit->tree, p, "");
 158                 if (process_commit(commit) == STOP)
 159                         break;
 160         }
 161         for (pending = pending_objects; pending; pending = pending->next) {
 162                 struct object *obj = pending->item;
 163                 const char *name = pending->name;
 164                 if (obj->flags & (UNINTERESTING | SEEN))
 165                         continue;
 166                 if (obj->type == tag_type) {
 167                         obj->flags |= SEEN;
 168                         p = add_object(obj, p, name);
 169                         continue;
 170                 }
 171                 if (obj->type == tree_type) {
 172                         p = process_tree((struct tree *)obj, p, name);
 173                         continue;
 174                 }
 175                 if (obj->type == blob_type) {
 176                         p = process_blob((struct blob *)obj, p, name);
 177                         continue;
 178                 }
 179                 die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
 180         }
 181         while (objects) {
 182                 printf("%s %s\n", sha1_to_hex(objects->item->sha1), objects->name);
 183                 objects = objects->next;
 184         }
 185 }
 186
 187 static void mark_blob_uninteresting(struct blob *blob)
 188 {
 189         if (!blob_objects)
 190                 return;
 191         if (blob->object.flags & UNINTERESTING)
 192                 return;
 193         blob->object.flags |= UNINTERESTING;
 194 }
 195
 196 static void mark_tree_uninteresting(struct tree *tree)
 197 {
 198         struct object *obj = &tree->object;
 199         struct tree_entry_list *entry;
 200
 201         if (!tree_objects)
 202                 return;
 203         if (obj->flags & UNINTERESTING)
 204                 return;
 205         obj->flags |= UNINTERESTING;
 206         if (!has_sha1_file(obj->sha1))
 207                 return;
 208         if (parse_tree(tree) < 0)
 209                 die("bad tree %s", sha1_to_hex(obj->sha1));
 210         entry = tree->entries;
 211         while (entry) {
 212                 if (entry->directory)
 213                         mark_tree_uninteresting(entry->item.tree);
 214                 else
 215                         mark_blob_uninteresting(entry->item.blob);
 216                 entry = entry->next;
 217         }
 218 }
 219
 220 static void mark_parents_uninteresting(struct commit *commit)
 221 {
 222         struct commit_list *parents = commit->parents;
 223
 224         if (tree_objects)
 225                 mark_tree_uninteresting(commit->tree);
 226         while (parents) {
 227                 struct commit *commit = parents->item;
 228                 commit->object.flags |= UNINTERESTING;
 229
 230                 /*
 231                  * A missing commit is ok iff its parent is marked
 232                  * uninteresting.
 233                  *
 234                  * We just mark such a thing parsed, so that when
 235                  * it is popped next time around, we won't be trying
 236                  * to parse it and get an error.
 237                  */
 238                 if (!has_sha1_file(commit->object.sha1))
 239                         commit->object.parsed = 1;
 240                 parents = parents->next;
 241         }
 242 }
 243
 244 static int everybody_uninteresting(struct commit_list *orig)
 245 {
 246         struct commit_list *list = orig;
 247         while (list) {
 248                 struct commit *commit = list->item;
 249                 list = list->next;
 250                 if (commit->object.flags & UNINTERESTING)
 251                         continue;
 252                 return 0;
 253         }
 254
 255         /*
 256          * Ok, go back and mark all the edge trees uninteresting,
 257          * since otherwise we can have situations where a parent
 258          * that was marked uninteresting (and we never even had
 259          * to look at) had lots of objects that we don't want to
 260          * include.
 261          *
 262          * NOTE! This still doesn't mean that the object list is
 263          * "correct", since we may end up listing objects that
 264          * even older commits (that we don't list) do actually
 265          * reference, but it gets us to a minimal list (or very
 266          * close) in practice.
 267          */
 268         if (!tree_objects)
 269                 return 1;
 270
 271         while (orig) {
 272                 struct commit *commit = orig->item;
 273                 if (!parse_commit(commit) && commit->tree)
 274                         mark_tree_uninteresting(commit->tree);
 275                 orig = orig->next;
 276         }
 277         return 1;
 278 }
 279
 280 /*
 281  * This is a truly stupid algorithm, but it's only
 282  * used for bisection, and we just don't care enough.
 283  *
 284  * We care just barely enough to avoid recursing for
 285  * non-merge entries.
 286  */
 287 static int count_distance(struct commit_list *entry)
 288 {
 289         int nr = 0;
 290
 291         while (entry) {
 292                 struct commit *commit = entry->item;
 293                 struct commit_list *p;
 294
 295                 if (commit->object.flags & (UNINTERESTING | COUNTED))
 296                         break;
 297                 nr++;
 298                 commit->object.flags |= COUNTED;
 299                 p = commit->parents;
 300                 entry = p;
 301                 if (p) {
 302                         p = p->next;
 303                         while (p) {
 304                                 nr += count_distance(p);
 305                                 p = p->next;
 306                         }
 307                 }
 308         }
 309         return nr;
 310 }
 311
 312 static void clear_distance(struct commit_list *list)
 313 {
 314         while (list) {
 315                 struct commit *commit = list->item;
 316                 commit->object.flags &= ~COUNTED;
 317                 list = list->next;
 318         }
 319 }
 320
 321 static struct commit_list *find_bisection(struct commit_list *list)
 322 {
 323         int nr, closest;
 324         struct commit_list *p, *best;
 325
 326         nr = 0;
 327         p = list;
 328         while (p) {
 329                 nr++;
 330                 p = p->next;
 331         }
 332         closest = 0;
 333         best = list;
 334
 335         p = list;
 336         while (p) {
 337                 int distance = count_distance(p);
 338                 clear_distance(list);
 339                 if (nr - distance < distance)
 340                         distance = nr - distance;
 341                 if (distance > closest) {
 342                         best = p;
 343                         closest = distance;
 344                 }
 345                 p = p->next;
 346         }
 347         if (best)
 348                 best->next = NULL;
 349         return best;
 350 }
 351
 352 static struct commit_list *limit_list(struct commit_list *list)
 353 {
 354         struct commit_list *newlist = NULL;
 355         struct commit_list **p = &newlist;
 356         while (list) {
 357                 struct commit *commit = pop_most_recent_commit(&list, SEEN);
 358                 struct object *obj = &commit->object;
 359
 360                 if (unpacked && has_sha1_pack(obj->sha1))
 361                         obj->flags |= UNINTERESTING;
 362                 if (obj->flags & UNINTERESTING) {
 363                         mark_parents_uninteresting(commit);
 364                         if (everybody_uninteresting(list))
 365                                 break;
 366                         continue;
 367                 }
 368                 p = &commit_list_insert(commit, p)->next;
 369         }
 370         if (bisect_list)
 371                 newlist = find_bisection(newlist);
 372         return newlist;
 373 }
 374
 375 static void add_pending_object(struct object *obj, const char *name)
 376 {
 377         add_object(obj, &pending_objects, name);
 378 }
 379
 380 static struct commit *get_commit_reference(const char *name, unsigned int flags)
 381 {
 382         unsigned char sha1[20];
 383         struct object *object;
 384
 385         if (get_sha1(name, sha1))
 386                 usage(rev_list_usage);
 387         object = parse_object(sha1);
 388         if (!object)
 389                 die("bad object %s", name);
 390
 391         /*
 392          * Tag object? Look what it points to..
 393          */
 394         while (object->type == tag_type) {
 395                 struct tag *tag = (struct tag *) object;
 396                 object->flags |= flags;
 397                 if (tag_objects && !(object->flags & UNINTERESTING))
 398                         add_pending_object(object, tag->tag);
 399                 object = parse_object(tag->tagged->sha1);
 400         }
 401
 402         /*
 403          * Commit object? Just return it, we'll do all the complex
 404          * reachability crud.
 405          */
 406         if (object->type == commit_type) {
 407                 struct commit *commit = (struct commit *)object;
 408                 object->flags |= flags;
 409                 if (parse_commit(commit) < 0)
 410                         die("unable to parse commit %s", name);
 411                 if (flags & UNINTERESTING)
 412                         mark_parents_uninteresting(commit);
 413                 return commit;
 414         }
 415
 416         /*
 417          * Tree object? Either mark it uniniteresting, or add it
 418          * to the list of objects to look at later..
 419          */
 420         if (object->type == tree_type) {
 421                 struct tree *tree = (struct tree *)object;
 422                 if (!tree_objects)
 423                         return NULL;
 424                 if (flags & UNINTERESTING) {
 425                         mark_tree_uninteresting(tree);
 426                         return NULL;
 427                 }
 428                 add_pending_object(object, "");
 429                 return NULL;
 430         }
 431
 432         /*
 433          * Blob object? You know the drill by now..
 434          */
 435         if (object->type == blob_type) {
 436                 struct blob *blob = (struct blob *)object;
 437                 if (!blob_objects)
 438                         return NULL;
 439                 if (flags & UNINTERESTING) {
 440                         mark_blob_uninteresting(blob);
 441                         return NULL;
 442                 }
 443                 add_pending_object(object, "");
 444                 return NULL;
 445         }
 446         die("%s is unknown object", name);
 447 }
 448
 449 int main(int argc, char **argv)
 450 {
 451         struct commit_list *list = NULL;
 452         int i, limited = 0;
 453
 454         for (i = 1 ; i < argc; i++) {
 455                 int flags;
 456                 char *arg = argv[i];
 457                 struct commit *commit;
 458
 459                 if (!strncmp(arg, "--max-count=", 12)) {
 460                         max_count = atoi(arg + 12);
 461                         continue;
 462                 }
 463                 if (!strncmp(arg, "--max-age=", 10)) {
 464                         max_age = atoi(arg + 10);
 465                         continue;
 466                 }
 467                 if (!strncmp(arg, "--min-age=", 10)) {
 468                         min_age = atoi(arg + 10);
 469                         continue;
 470                 }
 471                 if (!strcmp(arg, "--header")) {
 472                         verbose_header = 1;
 473                         continue;
 474                 }
 475                 if (!strncmp(arg, "--pretty", 8)) {
 476                         commit_format = get_commit_format(arg+8);
 477                         verbose_header = 1;
 478                         hdr_termination = '\n';
 479                         prefix = "commit ";
 480                         continue;
 481                 }
 482                 if (!strcmp(arg, "--parents")) {
 483                         show_parents = 1;
 484                         continue;
 485                 }
 486                 if (!strcmp(arg, "--bisect")) {
 487                         bisect_list = 1;
 488                         continue;
 489                 }
 490                 if (!strcmp(arg, "--objects")) {
 491                         tag_objects = 1;
 492                         tree_objects = 1;
 493                         blob_objects = 1;
 494                         continue;
 495                 }
 496                 if (!strcmp(arg, "--unpacked")) {
 497                         unpacked = 1;
 498                         limited = 1;
 499                         continue;
 500                 }
 501                 if (!strcmp(arg, "--merge-order")) {
 502                         merge_order = 1;
 503                         continue;
 504                 }
 505                 if (!strcmp(arg, "--show-breaks")) {
 506                         show_breaks = 1;
 507                         continue;
 508                 }
 509                 if (!strcmp(arg, "--topo-order")) {
 510                         topo_order = 1;
 511                         limited = 1;
 512                         continue;
 513                 }
 514
 515                 flags = 0;
 516                 if (*arg == '^') {
 517                         flags = UNINTERESTING;
 518                         arg++;
 519                         limited = 1;
 520                 }
 521                 if (show_breaks && !merge_order)
 522                         usage(rev_list_usage);
 523                 commit = get_commit_reference(arg, flags);
 524                 if (!commit)
 525                         continue;
 526                 if (commit->object.flags & SEEN)
 527                         continue;
 528                 commit->object.flags |= SEEN;
 529                 commit_list_insert(commit, &list);
 530         }
 531
 532         if (!merge_order) {
 533                 sort_by_date(&list);
 534                 if (limited)
 535                         list = limit_list(list);
 536                 if (topo_order)
 537                         sort_in_topological_order(&list);
 538                 show_commit_list(list);
 539         } else {
 540                 if (sort_list_in_merge_order(list, &process_commit)) {
 541                           die("merge order sort failed\n");
 542                 }
 543         }
 544
 545         return 0;
 546 }