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         fflush(stdout);
  68 }
  69
  70 static int filter_commit(struct commit * commit)
  71 {
  72         if (merge_order && stop_traversal && commit->object.flags & BOUNDARY)
  73                 return STOP;
  74         if (commit->object.flags & (UNINTERESTING|SHOWN))
  75                 return CONTINUE;
  76         if (min_age != -1 && (commit->date > min_age))
  77                 return CONTINUE;
  78         if (max_age != -1 && (commit->date < max_age)) {
  79                 if (!merge_order)
  80                         return STOP;
  81                 else {
  82                         stop_traversal = 1;
  83                         return CONTINUE;
  84                 }
  85         }
  86         if (max_count != -1 && !max_count--)
  87                 return STOP;
  88         return DO;
  89 }
  90
  91 static int process_commit(struct commit * commit)
  92 {
  93         int action=filter_commit(commit);
  94
  95         if (action == STOP) {
  96                 return STOP;
  97         }
  98
  99         if (action == CONTINUE) {
 100                 return CONTINUE;
 101         }
 102
 103         show_commit(commit);
 104
 105         return CONTINUE;
 106 }
 107
 108 static struct object_list **add_object(struct object *obj, struct object_list **p, const char *name)
 109 {
 110         struct object_list *entry = xmalloc(sizeof(*entry));
 111         entry->item = obj;
 112         entry->next = *p;
 113         entry->name = name;
 114         *p = entry;
 115         return &entry->next;
 116 }
 117
 118 static struct object_list **process_blob(struct blob *blob, struct object_list **p, const char *name)
 119 {
 120         struct object *obj = &blob->object;
 121
 122         if (!blob_objects)
 123                 return p;
 124         if (obj->flags & (UNINTERESTING | SEEN))
 125                 return p;
 126         obj->flags |= SEEN;
 127         return add_object(obj, p, name);
 128 }
 129
 130 static struct object_list **process_tree(struct tree *tree, struct object_list **p, const char *name)
 131 {
 132         struct object *obj = &tree->object;
 133         struct tree_entry_list *entry;
 134
 135         if (!tree_objects)
 136                 return p;
 137         if (obj->flags & (UNINTERESTING | SEEN))
 138                 return p;
 139         if (parse_tree(tree) < 0)
 140                 die("bad tree object %s", sha1_to_hex(obj->sha1));
 141         obj->flags |= SEEN;
 142         p = add_object(obj, p, name);
 143         for (entry = tree->entries ; entry ; entry = entry->next) {
 144                 if (entry->directory)
 145                         p = process_tree(entry->item.tree, p, entry->name);
 146                 else
 147                         p = process_blob(entry->item.blob, p, entry->name);
 148         }
 149         return p;
 150 }
 151
 152 static struct object_list *pending_objects = NULL;
 153
 154 static void show_commit_list(struct commit_list *list)
 155 {
 156         struct object_list *objects = NULL, **p = &objects, *pending;
 157         while (list) {
 158                 struct commit *commit = pop_most_recent_commit(&list, SEEN);
 159
 160                 p = process_tree(commit->tree, p, "");
 161                 if (process_commit(commit) == STOP)
 162                         break;
 163         }
 164         for (pending = pending_objects; pending; pending = pending->next) {
 165                 struct object *obj = pending->item;
 166                 const char *name = pending->name;
 167                 if (obj->flags & (UNINTERESTING | SEEN))
 168                         continue;
 169                 if (obj->type == tag_type) {
 170                         obj->flags |= SEEN;
 171                         p = add_object(obj, p, name);
 172                         continue;
 173                 }
 174                 if (obj->type == tree_type) {
 175                         p = process_tree((struct tree *)obj, p, name);
 176                         continue;
 177                 }
 178                 if (obj->type == blob_type) {
 179                         p = process_blob((struct blob *)obj, p, name);
 180                         continue;
 181                 }
 182                 die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
 183         }
 184         while (objects) {
 185                 printf("%s %s\n", sha1_to_hex(objects->item->sha1), objects->name);
 186                 objects = objects->next;
 187         }
 188 }
 189
 190 static void mark_blob_uninteresting(struct blob *blob)
 191 {
 192         if (!blob_objects)
 193                 return;
 194         if (blob->object.flags & UNINTERESTING)
 195                 return;
 196         blob->object.flags |= UNINTERESTING;
 197 }
 198
 199 static void mark_tree_uninteresting(struct tree *tree)
 200 {
 201         struct object *obj = &tree->object;
 202         struct tree_entry_list *entry;
 203
 204         if (!tree_objects)
 205                 return;
 206         if (obj->flags & UNINTERESTING)
 207                 return;
 208         obj->flags |= UNINTERESTING;
 209         if (parse_tree(tree) < 0)
 210                 die("bad tree %s", sha1_to_hex(obj->sha1));
 211         entry = tree->entries;
 212         while (entry) {
 213                 if (entry->directory)
 214                         mark_tree_uninteresting(entry->item.tree);
 215                 else
 216                         mark_blob_uninteresting(entry->item.blob);
 217                 entry = entry->next;
 218         }
 219 }
 220
 221 static void mark_parents_uninteresting(struct commit *commit)
 222 {
 223         struct commit_list *parents = commit->parents;
 224
 225         if (tree_objects)
 226                 mark_tree_uninteresting(commit->tree);
 227         while (parents) {
 228                 struct commit *commit = parents->item;
 229                 commit->object.flags |= UNINTERESTING;
 230                 parents = parents->next;
 231         }
 232 }
 233
 234 static int everybody_uninteresting(struct commit_list *list)
 235 {
 236         while (list) {
 237                 struct commit *commit = list->item;
 238                 list = list->next;
 239                 if (commit->object.flags & UNINTERESTING)
 240                         continue;
 241                 return 0;
 242         }
 243         return 1;
 244 }
 245
 246 /*
 247  * This is a truly stupid algorithm, but it's only
 248  * used for bisection, and we just don't care enough.
 249  *
 250  * We care just barely enough to avoid recursing for
 251  * non-merge entries.
 252  */
 253 static int count_distance(struct commit_list *entry)
 254 {
 255         int nr = 0;
 256
 257         while (entry) {
 258                 struct commit *commit = entry->item;
 259                 struct commit_list *p;
 260
 261                 if (commit->object.flags & (UNINTERESTING | COUNTED))
 262                         break;
 263                 nr++;
 264                 commit->object.flags |= COUNTED;
 265                 p = commit->parents;
 266                 entry = p;
 267                 if (p) {
 268                         p = p->next;
 269                         while (p) {
 270                                 nr += count_distance(p);
 271                                 p = p->next;
 272                         }
 273                 }
 274         }
 275         return nr;
 276 }
 277
 278 static void clear_distance(struct commit_list *list)
 279 {
 280         while (list) {
 281                 struct commit *commit = list->item;
 282                 commit->object.flags &= ~COUNTED;
 283                 list = list->next;
 284         }
 285 }
 286
 287 static struct commit_list *find_bisection(struct commit_list *list)
 288 {
 289         int nr, closest;
 290         struct commit_list *p, *best;
 291
 292         nr = 0;
 293         p = list;
 294         while (p) {
 295                 nr++;
 296                 p = p->next;
 297         }
 298         closest = 0;
 299         best = list;
 300
 301         p = list;
 302         while (p) {
 303                 int distance = count_distance(p);
 304                 clear_distance(list);
 305                 if (nr - distance < distance)
 306                         distance = nr - distance;
 307                 if (distance > closest) {
 308                         best = p;
 309                         closest = distance;
 310                 }
 311                 p = p->next;
 312         }
 313         if (best)
 314                 best->next = NULL;
 315         return best;
 316 }
 317
 318 static struct commit_list *limit_list(struct commit_list *list)
 319 {
 320         struct commit_list *newlist = NULL;
 321         struct commit_list **p = &newlist;
 322         while (list) {
 323                 struct commit *commit = pop_most_recent_commit(&list, SEEN);
 324                 struct object *obj = &commit->object;
 325
 326                 if (unpacked && has_sha1_pack(obj->sha1))
 327                         obj->flags |= UNINTERESTING;
 328                 if (obj->flags & UNINTERESTING) {
 329                         mark_parents_uninteresting(commit);
 330                         if (everybody_uninteresting(list))
 331                                 break;
 332                         continue;
 333                 }
 334                 p = &commit_list_insert(commit, p)->next;
 335         }
 336         if (bisect_list)
 337                 newlist = find_bisection(newlist);
 338         return newlist;
 339 }
 340
 341 static void add_pending_object(struct object *obj, const char *name)
 342 {
 343         add_object(obj, &pending_objects, name);
 344 }
 345
 346 static struct commit *get_commit_reference(const char *name, unsigned int flags)
 347 {
 348         unsigned char sha1[20];
 349         struct object *object;
 350
 351         if (get_sha1(name, sha1))
 352                 usage(rev_list_usage);
 353         object = parse_object(sha1);
 354         if (!object)
 355                 die("bad object %s", name);
 356
 357         /*
 358          * Tag object? Look what it points to..
 359          */
 360         if (object->type == tag_type) {
 361                 struct tag *tag = (struct tag *) object;
 362                 object->flags |= flags;
 363                 if (tag_objects && !(object->flags & UNINTERESTING))
 364                         add_pending_object(object, tag->tag);
 365                 object = tag->tagged;
 366         }
 367
 368         /*
 369          * Commit object? Just return it, we'll do all the complex
 370          * reachability crud.
 371          */
 372         if (object->type == commit_type) {
 373                 struct commit *commit = (struct commit *)object;
 374                 object->flags |= flags;
 375                 if (parse_commit(commit) < 0)
 376                         die("unable to parse commit %s", name);
 377                 return commit;
 378         }
 379
 380         /*
 381          * Tree object? Either mark it uniniteresting, or add it
 382          * to the list of objects to look at later..
 383          */
 384         if (object->type == tree_type) {
 385                 struct tree *tree = (struct tree *)object;
 386                 if (!tree_objects)
 387                         return NULL;
 388                 if (flags & UNINTERESTING) {
 389                         mark_tree_uninteresting(tree);
 390                         return NULL;
 391                 }
 392                 add_pending_object(object, "");
 393                 return NULL;
 394         }
 395
 396         /*
 397          * Blob object? You know the drill by now..
 398          */
 399         if (object->type == blob_type) {
 400                 struct blob *blob = (struct blob *)object;
 401                 if (!blob_objects)
 402                         return NULL;
 403                 if (flags & UNINTERESTING) {
 404                         mark_blob_uninteresting(blob);
 405                         return NULL;
 406                 }
 407                 add_pending_object(object, "");
 408                 return NULL;
 409         }
 410         die("%s is unknown object", name);
 411 }
 412
 413 int main(int argc, char **argv)
 414 {
 415         struct commit_list *list = NULL;
 416         struct commit_list *(*insert)(struct commit *, struct commit_list **);
 417         int i, limited = 0;
 418
 419         insert = insert_by_date;
 420         for (i = 1 ; i < argc; i++) {
 421                 int flags;
 422                 char *arg = argv[i];
 423                 struct commit *commit;
 424
 425                 if (!strncmp(arg, "--max-count=", 12)) {
 426                         max_count = atoi(arg + 12);
 427                         continue;
 428                 }
 429                 if (!strncmp(arg, "--max-age=", 10)) {
 430                         max_age = atoi(arg + 10);
 431                         continue;
 432                 }
 433                 if (!strncmp(arg, "--min-age=", 10)) {
 434                         min_age = atoi(arg + 10);
 435                         continue;
 436                 }
 437                 if (!strcmp(arg, "--header")) {
 438                         verbose_header = 1;
 439                         continue;
 440                 }
 441                 if (!strncmp(arg, "--pretty", 8)) {
 442                         commit_format = get_commit_format(arg+8);
 443                         verbose_header = 1;
 444                         hdr_termination = '\n';
 445                         prefix = "commit ";
 446                         continue;
 447                 }
 448                 if (!strcmp(arg, "--parents")) {
 449                         show_parents = 1;
 450                         continue;
 451                 }
 452                 if (!strcmp(arg, "--bisect")) {
 453                         bisect_list = 1;
 454                         continue;
 455                 }
 456                 if (!strcmp(arg, "--objects")) {
 457                         tag_objects = 1;
 458                         tree_objects = 1;
 459                         blob_objects = 1;
 460                         continue;
 461                 }
 462                 if (!strcmp(arg, "--unpacked")) {
 463                         unpacked = 1;
 464                         limited = 1;
 465                         continue;
 466                 }
 467                 if (!strcmp(arg, "--merge-order")) {
 468                         merge_order = 1;
 469                         insert = commit_list_insert;
 470                         continue;
 471                 }
 472                 if (!strcmp(arg, "--show-breaks")) {
 473                         show_breaks = 1;
 474                         continue;
 475                 }
 476
 477                 flags = 0;
 478                 if (*arg == '^') {
 479                         flags = UNINTERESTING;
 480                         arg++;
 481                         limited = 1;
 482                 }
 483                 if (show_breaks && !merge_order)
 484                         usage(rev_list_usage);
 485                 commit = get_commit_reference(arg, flags);
 486                 if (!commit)
 487                         continue;
 488                 insert(commit, &list);
 489         }
 490
 491         if (!merge_order) {
 492                 if (limited)
 493                         list = limit_list(list);
 494                 show_commit_list(list);
 495         } else {
 496                 if (sort_list_in_merge_order(list, &process_commit)) {
 497                           die("merge order sort failed\n");
 498                 }
 499         }
 500
 501         return 0;
 502 }