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           (LAST_EPOCH_FLAG << 2)
  12
  13 static const char rev_list_usage[] =
  14         "usage: 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
  42 static void show_commit(struct commit *commit)
  43 {
  44         commit->object.flags |= SHOWN;
  45         if (show_breaks) {
  46                 prefix = "| ";
  47                 if (commit->object.flags & DISCONTINUITY) {
  48                         prefix = "^ ";
  49                 } else if (commit->object.flags & BOUNDARY) {
  50                         prefix = "= ";
  51                 }
  52         }
  53         printf("%s%s", prefix, sha1_to_hex(commit->object.sha1));
  54         if (show_parents) {
  55                 struct commit_list *parents = commit->parents;
  56                 while (parents) {
  57                         printf(" %s", sha1_to_hex(parents->item->object.sha1));
  58                         parents = parents->next;
  59                 }
  60         }
  61         putchar('\n');
  62         if (verbose_header) {
  63                 static char pretty_header[16384];
  64                 pretty_print_commit(commit_format, commit->buffer, ~0, pretty_header, sizeof(pretty_header));
  65                 printf("%s%c", pretty_header, hdr_termination);
  66         }
  67 }
  68
  69 static int filter_commit(struct commit * commit)
  70 {
  71         if (merge_order && stop_traversal && commit->object.flags & BOUNDARY)
  72                 return STOP;
  73         if (commit->object.flags & (UNINTERESTING|SHOWN))
  74                 return CONTINUE;
  75         if (min_age != -1 && (commit->date > min_age))
  76                 return CONTINUE;
  77         if (max_age != -1 && (commit->date < max_age)) {
  78                 if (!merge_order)
  79                         return STOP;
  80                 else {
  81                         stop_traversal = 1;
  82                         return CONTINUE;
  83                 }
  84         }
  85         if (max_count != -1 && !max_count--)
  86                 return STOP;
  87         return DO;
  88 }
  89
  90 static int process_commit(struct commit * commit)
  91 {
  92         int action=filter_commit(commit);
  93
  94         if (action == STOP) {
  95                 return STOP;
  96         }
  97
  98         if (action == CONTINUE) {
  99                 return CONTINUE;
 100         }
 101
 102         show_commit(commit);
 103
 104         return CONTINUE;
 105 }
 106
 107 static struct object_list **add_object(struct object *obj, struct object_list **p, const char *name)
 108 {
 109         struct object_list *entry = xmalloc(sizeof(*entry));
 110         entry->item = obj;
 111         entry->next = *p;
 112         entry->name = name;
 113         *p = entry;
 114         return &entry->next;
 115 }
 116
 117 static struct object_list **process_blob(struct blob *blob, struct object_list **p, const char *name)
 118 {
 119         struct object *obj = &blob->object;
 120
 121         if (!blob_objects)
 122                 return p;
 123         if (obj->flags & (UNINTERESTING | SEEN))
 124                 return p;
 125         obj->flags |= SEEN;
 126         return add_object(obj, p, name);
 127 }
 128
 129 static struct object_list **process_tree(struct tree *tree, struct object_list **p, const char *name)
 130 {
 131         struct object *obj = &tree->object;
 132         struct tree_entry_list *entry;
 133
 134         if (!tree_objects)
 135                 return p;
 136         if (obj->flags & (UNINTERESTING | SEEN))
 137                 return p;
 138         if (parse_tree(tree) < 0)
 139                 die("bad tree object %s", sha1_to_hex(obj->sha1));
 140         obj->flags |= SEEN;
 141         p = add_object(obj, p, name);
 142         for (entry = tree->entries ; entry ; entry = entry->next) {
 143                 if (entry->directory)
 144                         p = process_tree(entry->item.tree, p, entry->name);
 145                 else
 146                         p = process_blob(entry->item.blob, p, entry->name);
 147         }
 148         return p;
 149 }
 150
 151 static struct object_list *pending_objects = NULL;
 152
 153 static void show_commit_list(struct commit_list *list)
 154 {
 155         struct object_list *objects = NULL, **p = &objects, *pending;
 156         while (list) {
 157                 struct commit *commit = pop_most_recent_commit(&list, SEEN);
 158
 159                 p = process_tree(commit->tree, p, "");
 160                 if (process_commit(commit) == STOP)
 161                         break;
 162         }
 163         for (pending = pending_objects; pending; pending = pending->next) {
 164                 struct object *obj = pending->item;
 165                 const char *name = pending->name;
 166                 if (obj->flags & (UNINTERESTING | SEEN))
 167                         continue;
 168                 if (obj->type == tag_type) {
 169                         obj->flags |= SEEN;
 170                         p = add_object(obj, p, name);
 171                         continue;
 172                 }
 173                 if (obj->type == tree_type) {
 174                         p = process_tree((struct tree *)obj, p, name);
 175                         continue;
 176                 }
 177                 if (obj->type == blob_type) {
 178                         p = process_blob((struct blob *)obj, p, name);
 179                         continue;
 180                 }
 181                 die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
 182         }
 183         while (objects) {
 184                 printf("%s %s\n", sha1_to_hex(objects->item->sha1), objects->name);
 185                 objects = objects->next;
 186         }
 187 }
 188
 189 static void mark_blob_uninteresting(struct blob *blob)
 190 {
 191         if (!blob_objects)
 192                 return;
 193         if (blob->object.flags & UNINTERESTING)
 194                 return;
 195         blob->object.flags |= UNINTERESTING;
 196 }
 197
 198 static void mark_tree_uninteresting(struct tree *tree)
 199 {
 200         struct object *obj = &tree->object;
 201         struct tree_entry_list *entry;
 202
 203         if (!tree_objects)
 204                 return;
 205         if (obj->flags & UNINTERESTING)
 206                 return;
 207         obj->flags |= UNINTERESTING;
 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                 parents = parents->next;
 230         }
 231 }
 232
 233 static int everybody_uninteresting(struct commit_list *list)
 234 {
 235         while (list) {
 236                 struct commit *commit = list->item;
 237                 list = list->next;
 238                 if (commit->object.flags & UNINTERESTING)
 239                         continue;
 240                 return 0;
 241         }
 242         return 1;
 243 }
 244
 245 /*
 246  * This is a truly stupid algorithm, but it's only
 247  * used for bisection, and we just don't care enough.
 248  *
 249  * We care just barely enough to avoid recursing for
 250  * non-merge entries.
 251  */
 252 static int count_distance(struct commit_list *entry)
 253 {
 254         int nr = 0;
 255
 256         while (entry) {
 257                 struct commit *commit = entry->item;
 258                 struct commit_list *p;
 259
 260                 if (commit->object.flags & (UNINTERESTING | COUNTED))
 261                         break;
 262                 nr++;
 263                 commit->object.flags |= COUNTED;
 264                 p = commit->parents;
 265                 entry = p;
 266                 if (p) {
 267                         p = p->next;
 268                         while (p) {
 269                                 nr += count_distance(p);
 270                                 p = p->next;
 271                         }
 272                 }
 273         }
 274         return nr;
 275 }
 276
 277 static void clear_distance(struct commit_list *list)
 278 {
 279         while (list) {
 280                 struct commit *commit = list->item;
 281                 commit->object.flags &= ~COUNTED;
 282                 list = list->next;
 283         }
 284 }
 285
 286 static struct commit_list *find_bisection(struct commit_list *list)
 287 {
 288         int nr, closest;
 289         struct commit_list *p, *best;
 290
 291         nr = 0;
 292         p = list;
 293         while (p) {
 294                 nr++;
 295                 p = p->next;
 296         }
 297         closest = 0;
 298         best = list;
 299
 300         p = list;
 301         while (p) {
 302                 int distance = count_distance(p);
 303                 clear_distance(list);
 304                 if (nr - distance < distance)
 305                         distance = nr - distance;
 306                 if (distance > closest) {
 307                         best = p;
 308                         closest = distance;
 309                 }
 310                 p = p->next;
 311         }
 312         if (best)
 313                 best->next = NULL;
 314         return best;
 315 }
 316
 317 static struct commit_list *limit_list(struct commit_list *list)
 318 {
 319         struct commit_list *newlist = NULL;
 320         struct commit_list **p = &newlist;
 321         while (list) {
 322                 struct commit *commit = pop_most_recent_commit(&list, SEEN);
 323                 struct object *obj = &commit->object;
 324
 325                 if (unpacked && has_sha1_pack(obj->sha1))
 326                         obj->flags |= UNINTERESTING;
 327                 if (obj->flags & UNINTERESTING) {
 328                         mark_parents_uninteresting(commit);
 329                         if (everybody_uninteresting(list))
 330                                 break;
 331                         continue;
 332                 }
 333                 p = &commit_list_insert(commit, p)->next;
 334         }
 335         if (bisect_list)
 336                 newlist = find_bisection(newlist);
 337         return newlist;
 338 }
 339
 340 static void add_pending_object(struct object *obj, const char *name)
 341 {
 342         add_object(obj, &pending_objects, name);
 343 }
 344
 345 static struct commit *get_commit_reference(const char *name, unsigned int flags)
 346 {
 347         unsigned char sha1[20];
 348         struct object *object;
 349
 350         if (get_sha1(name, sha1))
 351                 usage(rev_list_usage);
 352         object = parse_object(sha1);
 353         if (!object)
 354                 die("bad object %s", name);
 355
 356         /*
 357          * Tag object? Look what it points to..
 358          */
 359         if (object->type == tag_type) {
 360                 struct tag *tag = (struct tag *) object;
 361                 object->flags |= flags;
 362                 if (tag_objects && !(object->flags & UNINTERESTING))
 363                         add_pending_object(object, tag->tag);
 364                 object = tag->tagged;
 365         }
 366
 367         /*
 368          * Commit object? Just return it, we'll do all the complex
 369          * reachability crud.
 370          */
 371         if (object->type == commit_type) {
 372                 struct commit *commit = (struct commit *)object;
 373                 object->flags |= flags;
 374                 if (parse_commit(commit) < 0)
 375                         die("unable to parse commit %s", name);
 376                 return commit;
 377         }
 378
 379         /*
 380          * Tree object? Either mark it uniniteresting, or add it
 381          * to the list of objects to look at later..
 382          */
 383         if (object->type == tree_type) {
 384                 struct tree *tree = (struct tree *)object;
 385                 if (!tree_objects)
 386                         return NULL;
 387                 if (flags & UNINTERESTING) {
 388                         mark_tree_uninteresting(tree);
 389                         return NULL;
 390                 }
 391                 add_pending_object(object, "");
 392                 return NULL;
 393         }
 394
 395         /*
 396          * Blob object? You know the drill by now..
 397          */
 398         if (object->type == blob_type) {
 399                 struct blob *blob = (struct blob *)object;
 400                 if (!blob_objects)
 401                         return NULL;
 402                 if (flags & UNINTERESTING) {
 403                         mark_blob_uninteresting(blob);
 404                         return NULL;
 405                 }
 406                 add_pending_object(object, "");
 407                 return NULL;
 408         }
 409         die("%s is unknown object", name);
 410 }
 411
 412 int main(int argc, char **argv)
 413 {
 414         struct commit_list *list = NULL;
 415         int i, limited = 0;
 416
 417         for (i = 1 ; i < argc; i++) {
 418                 int flags;
 419                 char *arg = argv[i];
 420                 struct commit *commit;
 421
 422                 if (!strncmp(arg, "--max-count=", 12)) {
 423                         max_count = atoi(arg + 12);
 424                         continue;
 425                 }
 426                 if (!strncmp(arg, "--max-age=", 10)) {
 427                         max_age = atoi(arg + 10);
 428                         continue;
 429                 }
 430                 if (!strncmp(arg, "--min-age=", 10)) {
 431                         min_age = atoi(arg + 10);
 432                         continue;
 433                 }
 434                 if (!strcmp(arg, "--header")) {
 435                         verbose_header = 1;
 436                         continue;
 437                 }
 438                 if (!strncmp(arg, "--pretty", 8)) {
 439                         commit_format = get_commit_format(arg+8);
 440                         verbose_header = 1;
 441                         hdr_termination = '\n';
 442                         prefix = "commit ";
 443                         continue;
 444                 }
 445                 if (!strcmp(arg, "--parents")) {
 446                         show_parents = 1;
 447                         continue;
 448                 }
 449                 if (!strcmp(arg, "--bisect")) {
 450                         bisect_list = 1;
 451                         continue;
 452                 }
 453                 if (!strcmp(arg, "--objects")) {
 454                         tag_objects = 1;
 455                         tree_objects = 1;
 456                         blob_objects = 1;
 457                         continue;
 458                 }
 459                 if (!strcmp(arg, "--unpacked")) {
 460                         unpacked = 1;
 461                         limited = 1;
 462                         continue;
 463                 }
 464                 if (!strncmp(arg, "--merge-order", 13)) {
 465                         merge_order = 1;
 466                         continue;
 467                 }
 468                 if (!strncmp(arg, "--show-breaks", 13)) {
 469                         show_breaks = 1;
 470                         continue;
 471                 }
 472
 473                 flags = 0;
 474                 if (*arg == '^') {
 475                         flags = UNINTERESTING;
 476                         arg++;
 477                         limited = 1;
 478                 }
 479                 if (show_breaks && !merge_order)
 480                         usage(rev_list_usage);
 481                 commit = get_commit_reference(arg, flags);
 482                 if (!commit)
 483                         continue;
 484                 commit_list_insert(commit, &list);
 485         }
 486
 487         if (!merge_order) {
 488                 if (limited)
 489                         list = limit_list(list);
 490                 show_commit_list(list);
 491         } else {
 492                 if (sort_list_in_merge_order(list, &process_commit)) {
 493                           die("merge order sort failed\n");
 494                 }
 495         }
 496
 497         return 0;
 498 }