builtin/rev-list.c

   1 #include "cache.h"
   2 #include "config.h"
   3 #include "commit.h"
   4 #include "diff.h"
   5 #include "revision.h"
   6 #include "list-objects.h"
   7 #include "list-objects-filter.h"
   8 #include "list-objects-filter-options.h"
   9 #include "object.h"
  10 #include "object-store.h"
  11 #include "pack.h"
  12 #include "pack-bitmap.h"
  13 #include "builtin.h"
  14 #include "log-tree.h"
  15 #include "graph.h"
  16 #include "bisect.h"
  17 #include "progress.h"
  18 #include "reflog-walk.h"
  19 #include "oidset.h"
  20 #include "packfile.h"
  21
  22 static const char rev_list_usage[] =
  23 "git rev-list [OPTION] <commit-id>... [ -- paths... ]\n"
  24 "  limiting output:\n"
  25 "    --max-count=<n>\n"
  26 "    --max-age=<epoch>\n"
  27 "    --min-age=<epoch>\n"
  28 "    --sparse\n"
  29 "    --no-merges\n"
  30 "    --min-parents=<n>\n"
  31 "    --no-min-parents\n"
  32 "    --max-parents=<n>\n"
  33 "    --no-max-parents\n"
  34 "    --remove-empty\n"
  35 "    --all\n"
  36 "    --branches\n"
  37 "    --tags\n"
  38 "    --remotes\n"
  39 "    --stdin\n"
  40 "    --quiet\n"
  41 "  ordering output:\n"
  42 "    --topo-order\n"
  43 "    --date-order\n"
  44 "    --reverse\n"
  45 "  formatting output:\n"
  46 "    --parents\n"
  47 "    --children\n"
  48 "    --objects | --objects-edge\n"
  49 "    --unpacked\n"
  50 "    --header | --pretty\n"
  51 "    --[no-]object-names\n"
  52 "    --abbrev=<n> | --no-abbrev\n"
  53 "    --abbrev-commit\n"
  54 "    --left-right\n"
  55 "    --count\n"
  56 "  special purpose:\n"
  57 "    --bisect\n"
  58 "    --bisect-vars\n"
  59 "    --bisect-all"
  60 ;
  61
  62 static struct progress *progress;
  63 static unsigned progress_counter;
  64
  65 static struct list_objects_filter_options filter_options;
  66 static struct oidset omitted_objects;
  67 static int arg_print_omitted; /* print objects omitted by filter */
  68
  69 static struct oidset missing_objects;
  70 enum missing_action {
  71         MA_ERROR = 0,    /* fail if any missing objects are encountered */
  72         MA_ALLOW_ANY,    /* silently allow ALL missing objects */
  73         MA_PRINT,        /* print ALL missing objects in special section */
  74         MA_ALLOW_PROMISOR, /* silently allow all missing PROMISOR objects */
  75 };
  76 static enum missing_action arg_missing_action;
  77
  78 /* display only the oid of each object encountered */
  79 static int arg_show_object_names = 1;
  80
  81 #define DEFAULT_OIDSET_SIZE     (16*1024)
  82
  83 static void finish_commit(struct commit *commit);
  84 static void show_commit(struct commit *commit, void *data)
  85 {
  86         struct rev_list_info *info = data;
  87         struct rev_info *revs = info->revs;
  88
  89         display_progress(progress, ++progress_counter);
  90
  91         if (info->flags & REV_LIST_QUIET) {
  92                 finish_commit(commit);
  93                 return;
  94         }
  95
  96         graph_show_commit(revs->graph);
  97
  98         if (revs->count) {
  99                 if (commit->object.flags & PATCHSAME)
 100                         revs->count_same++;
 101                 else if (commit->object.flags & SYMMETRIC_LEFT)
 102                         revs->count_left++;
 103                 else
 104                         revs->count_right++;
 105                 finish_commit(commit);
 106                 return;
 107         }
 108
 109         if (info->show_timestamp)
 110                 printf("%"PRItime" ", commit->date);
 111         if (info->header_prefix)
 112                 fputs(info->header_prefix, stdout);
 113
 114         if (!revs->graph)
 115                 fputs(get_revision_mark(revs, commit), stdout);
 116         if (revs->abbrev_commit && revs->abbrev)
 117                 fputs(find_unique_abbrev(&commit->object.oid, revs->abbrev),
 118                       stdout);
 119         else
 120                 fputs(oid_to_hex(&commit->object.oid), stdout);
 121         if (revs->print_parents) {
 122                 struct commit_list *parents = commit->parents;
 123                 while (parents) {
 124                         printf(" %s", oid_to_hex(&parents->item->object.oid));
 125                         parents = parents->next;
 126                 }
 127         }
 128         if (revs->children.name) {
 129                 struct commit_list *children;
 130
 131                 children = lookup_decoration(&revs->children, &commit->object);
 132                 while (children) {
 133                         printf(" %s", oid_to_hex(&children->item->object.oid));
 134                         children = children->next;
 135                 }
 136         }
 137         show_decorations(revs, commit);
 138         if (revs->commit_format == CMIT_FMT_ONELINE)
 139                 putchar(' ');
 140         else
 141                 putchar('\n');
 142
 143         if (revs->verbose_header) {
 144                 struct strbuf buf = STRBUF_INIT;
 145                 struct pretty_print_context ctx = {0};
 146                 ctx.abbrev = revs->abbrev;
 147                 ctx.date_mode = revs->date_mode;
 148                 ctx.date_mode_explicit = revs->date_mode_explicit;
 149                 ctx.fmt = revs->commit_format;
 150                 ctx.output_encoding = get_log_output_encoding();
 151                 ctx.color = revs->diffopt.use_color;
 152                 pretty_print_commit(&ctx, commit, &buf);
 153                 if (buf.len) {
 154                         if (revs->commit_format != CMIT_FMT_ONELINE)
 155                                 graph_show_oneline(revs->graph);
 156
 157                         graph_show_commit_msg(revs->graph, stdout, &buf);
 158
 159                         /*
 160                          * Add a newline after the commit message.
 161                          *
 162                          * Usually, this newline produces a blank
 163                          * padding line between entries, in which case
 164                          * we need to add graph padding on this line.
 165                          *
 166                          * However, the commit message may not end in a
 167                          * newline.  In this case the newline simply
 168                          * ends the last line of the commit message,
 169                          * and we don't need any graph output.  (This
 170                          * always happens with CMIT_FMT_ONELINE, and it
 171                          * happens with CMIT_FMT_USERFORMAT when the
 172                          * format doesn't explicitly end in a newline.)
 173                          */
 174                         if (buf.len && buf.buf[buf.len - 1] == '\n')
 175                                 graph_show_padding(revs->graph);
 176                         putchar(info->hdr_termination);
 177                 } else {
 178                         /*
 179                          * If the message buffer is empty, just show
 180                          * the rest of the graph output for this
 181                          * commit.
 182                          */
 183                         if (graph_show_remainder(revs->graph))
 184                                 putchar('\n');
 185                         if (revs->commit_format == CMIT_FMT_ONELINE)
 186                                 putchar('\n');
 187                 }
 188                 strbuf_release(&buf);
 189         } else {
 190                 if (graph_show_remainder(revs->graph))
 191                         putchar('\n');
 192         }
 193         maybe_flush_or_die(stdout, "stdout");
 194         finish_commit(commit);
 195 }
 196
 197 static void finish_commit(struct commit *commit)
 198 {
 199         if (commit->parents) {
 200                 free_commit_list(commit->parents);
 201                 commit->parents = NULL;
 202         }
 203         free_commit_buffer(the_repository->parsed_objects,
 204                            commit);
 205 }
 206
 207 static inline void finish_object__ma(struct object *obj)
 208 {
 209         /*
 210          * Whether or not we try to dynamically fetch missing objects
 211          * from the server, we currently DO NOT have the object.  We
 212          * can either print, allow (ignore), or conditionally allow
 213          * (ignore) them.
 214          */
 215         switch (arg_missing_action) {
 216         case MA_ERROR:
 217                 die("missing %s object '%s'",
 218                     type_name(obj->type), oid_to_hex(&obj->oid));
 219                 return;
 220
 221         case MA_ALLOW_ANY:
 222                 return;
 223
 224         case MA_PRINT:
 225                 oidset_insert(&missing_objects, &obj->oid);
 226                 return;
 227
 228         case MA_ALLOW_PROMISOR:
 229                 if (is_promisor_object(&obj->oid))
 230                         return;
 231                 die("unexpected missing %s object '%s'",
 232                     type_name(obj->type), oid_to_hex(&obj->oid));
 233                 return;
 234
 235         default:
 236                 BUG("unhandled missing_action");
 237                 return;
 238         }
 239 }
 240
 241 static int finish_object(struct object *obj, const char *name, void *cb_data)
 242 {
 243         struct rev_list_info *info = cb_data;
 244         if (oid_object_info_extended(the_repository, &obj->oid, NULL, 0) < 0) {
 245                 finish_object__ma(obj);
 246                 return 1;
 247         }
 248         if (info->revs->verify_objects && !obj->parsed && obj->type != OBJ_COMMIT)
 249                 parse_object(the_repository, &obj->oid);
 250         return 0;
 251 }
 252
 253 static void show_object(struct object *obj, const char *name, void *cb_data)
 254 {
 255         struct rev_list_info *info = cb_data;
 256         struct rev_info *revs = info->revs;
 257
 258         if (finish_object(obj, name, cb_data))
 259                 return;
 260         display_progress(progress, ++progress_counter);
 261         if (info->flags & REV_LIST_QUIET)
 262                 return;
 263
 264         if (revs->count) {
 265                 /*
 266                  * The object count is always accumulated in the .count_right
 267                  * field for traversal that is not a left-right traversal,
 268                  * and cmd_rev_list() made sure that a .count request that
 269                  * wants to count non-commit objects, which is handled by
 270                  * the show_object() callback, does not ask for .left_right.
 271                  */
 272                 revs->count_right++;
 273                 return;
 274         }
 275
 276         if (arg_show_object_names)
 277                 show_object_with_name(stdout, obj, name);
 278         else
 279                 printf("%s\n", oid_to_hex(&obj->oid));
 280 }
 281
 282 static void show_edge(struct commit *commit)
 283 {
 284         printf("-%s\n", oid_to_hex(&commit->object.oid));
 285 }
 286
 287 static void print_var_str(const char *var, const char *val)
 288 {
 289         printf("%s='%s'\n", var, val);
 290 }
 291
 292 static void print_var_int(const char *var, int val)
 293 {
 294         printf("%s=%d\n", var, val);
 295 }
 296
 297 static int show_bisect_vars(struct rev_list_info *info, int reaches, int all)
 298 {
 299         int cnt, flags = info->flags;
 300         char hex[GIT_MAX_HEXSZ + 1] = "";
 301         struct commit_list *tried;
 302         struct rev_info *revs = info->revs;
 303
 304         if (!revs->commits)
 305                 return 1;
 306
 307         revs->commits = filter_skipped(revs->commits, &tried,
 308                                        flags & BISECT_SHOW_ALL,
 309                                        NULL, NULL);
 310
 311         /*
 312          * revs->commits can reach "reaches" commits among
 313          * "all" commits.  If it is good, then there are
 314          * (all-reaches) commits left to be bisected.
 315          * On the other hand, if it is bad, then the set
 316          * to bisect is "reaches".
 317          * A bisect set of size N has (N-1) commits further
 318          * to test, as we already know one bad one.
 319          */
 320         cnt = all - reaches;
 321         if (cnt < reaches)
 322                 cnt = reaches;
 323
 324         if (revs->commits)
 325                 oid_to_hex_r(hex, &revs->commits->item->object.oid);
 326
 327         if (flags & BISECT_SHOW_ALL) {
 328                 traverse_commit_list(revs, show_commit, show_object, info);
 329                 printf("------\n");
 330         }
 331
 332         print_var_str("bisect_rev", hex);
 333         print_var_int("bisect_nr", cnt - 1);
 334         print_var_int("bisect_good", all - reaches - 1);
 335         print_var_int("bisect_bad", reaches - 1);
 336         print_var_int("bisect_all", all);
 337         print_var_int("bisect_steps", estimate_bisect_steps(all));
 338
 339         return 0;
 340 }
 341
 342 static int show_object_fast(
 343         const struct object_id *oid,
 344         enum object_type type,
 345         int exclude,
 346         uint32_t name_hash,
 347         struct packed_git *found_pack,
 348         off_t found_offset)
 349 {
 350         fprintf(stdout, "%s\n", oid_to_hex(oid));
 351         return 1;
 352 }
 353
 354 static inline int parse_missing_action_value(const char *value)
 355 {
 356         if (!strcmp(value, "error")) {
 357                 arg_missing_action = MA_ERROR;
 358                 return 1;
 359         }
 360
 361         if (!strcmp(value, "allow-any")) {
 362                 arg_missing_action = MA_ALLOW_ANY;
 363                 fetch_if_missing = 0;
 364                 return 1;
 365         }
 366
 367         if (!strcmp(value, "print")) {
 368                 arg_missing_action = MA_PRINT;
 369                 fetch_if_missing = 0;
 370                 return 1;
 371         }
 372
 373         if (!strcmp(value, "allow-promisor")) {
 374                 arg_missing_action = MA_ALLOW_PROMISOR;
 375                 fetch_if_missing = 0;
 376                 return 1;
 377         }
 378
 379         return 0;
 380 }
 381
 382 static int try_bitmap_count(struct rev_info *revs,
 383                             struct list_objects_filter_options *filter)
 384 {
 385         uint32_t commit_count = 0,
 386                  tag_count = 0,
 387                  tree_count = 0,
 388                  blob_count = 0;
 389         int max_count;
 390         struct bitmap_index *bitmap_git;
 391
 392         /* This function only handles counting, not general traversal. */
 393         if (!revs->count)
 394                 return -1;
 395
 396         /*
 397          * A bitmap result can't know left/right, etc, because we don't
 398          * actually traverse.
 399          */
 400         if (revs->left_right || revs->cherry_mark)
 401                 return -1;
 402
 403         /*
 404          * If we're counting reachable objects, we can't handle a max count of
 405          * commits to traverse, since we don't know which objects go with which
 406          * commit.
 407          */
 408         if (revs->max_count >= 0 &&
 409             (revs->tag_objects || revs->tree_objects || revs->blob_objects))
 410                 return -1;
 411
 412         /*
 413          * This must be saved before doing any walking, since the revision
 414          * machinery will count it down to zero while traversing.
 415          */
 416         max_count = revs->max_count;
 417
 418         bitmap_git = prepare_bitmap_walk(revs, filter);
 419         if (!bitmap_git)
 420                 return -1;
 421
 422         count_bitmap_commit_list(bitmap_git, &commit_count,
 423                                  revs->tree_objects ? &tree_count : NULL,
 424                                  revs->blob_objects ? &blob_count : NULL,
 425                                  revs->tag_objects ? &tag_count : NULL);
 426         if (max_count >= 0 && max_count < commit_count)
 427                 commit_count = max_count;
 428
 429         printf("%d\n", commit_count + tree_count + blob_count + tag_count);
 430         free_bitmap_index(bitmap_git);
 431         return 0;
 432 }
 433
 434 static int try_bitmap_traversal(struct rev_info *revs,
 435                                 struct list_objects_filter_options *filter)
 436 {
 437         struct bitmap_index *bitmap_git;
 438
 439         /*
 440          * We can't use a bitmap result with a traversal limit, since the set
 441          * of commits we'd get would be essentially random.
 442          */
 443         if (revs->max_count >= 0)
 444                 return -1;
 445
 446         bitmap_git = prepare_bitmap_walk(revs, filter);
 447         if (!bitmap_git)
 448                 return -1;
 449
 450         traverse_bitmap_commit_list(bitmap_git, revs, &show_object_fast);
 451         free_bitmap_index(bitmap_git);
 452         return 0;
 453 }
 454
 455 int cmd_rev_list(int argc, const char **argv, const char *prefix)
 456 {
 457         struct rev_info revs;
 458         struct rev_list_info info;
 459         struct setup_revision_opt s_r_opt = {
 460                 .allow_exclude_promisor_objects = 1,
 461         };
 462         int i;
 463         int bisect_list = 0;
 464         int bisect_show_vars = 0;
 465         int bisect_find_all = 0;
 466         int use_bitmap_index = 0;
 467         const char *show_progress = NULL;
 468
 469         if (argc == 2 && !strcmp(argv[1], "-h"))
 470                 usage(rev_list_usage);
 471
 472         git_config(git_default_config, NULL);
 473         repo_init_revisions(the_repository, &revs, prefix);
 474         revs.abbrev = DEFAULT_ABBREV;
 475         revs.commit_format = CMIT_FMT_UNSPECIFIED;
 476
 477         /*
 478          * Scan the argument list before invoking setup_revisions(), so that we
 479          * know if fetch_if_missing needs to be set to 0.
 480          *
 481          * "--exclude-promisor-objects" acts as a pre-filter on missing objects
 482          * by not crossing the boundary from realized objects to promisor
 483          * objects.
 484          *
 485          * Let "--missing" to conditionally set fetch_if_missing.
 486          */
 487         for (i = 1; i < argc; i++) {
 488                 const char *arg = argv[i];
 489                 if (!strcmp(arg, "--exclude-promisor-objects")) {
 490                         fetch_if_missing = 0;
 491                         revs.exclude_promisor_objects = 1;
 492                         break;
 493                 }
 494         }
 495         for (i = 1; i < argc; i++) {
 496                 const char *arg = argv[i];
 497                 if (skip_prefix(arg, "--missing=", &arg)) {
 498                         if (revs.exclude_promisor_objects)
 499                                 die(_("cannot combine --exclude-promisor-objects and --missing"));
 500                         if (parse_missing_action_value(arg))
 501                                 break;
 502                 }
 503         }
 504
 505         if (arg_missing_action)
 506                 revs.do_not_die_on_missing_tree = 1;
 507
 508         argc = setup_revisions(argc, argv, &revs, &s_r_opt);
 509
 510         memset(&info, 0, sizeof(info));
 511         info.revs = &revs;
 512         if (revs.bisect)
 513                 bisect_list = 1;
 514
 515         if (revs.diffopt.flags.quick)
 516                 info.flags |= REV_LIST_QUIET;
 517         for (i = 1 ; i < argc; i++) {
 518                 const char *arg = argv[i];
 519
 520                 if (!strcmp(arg, "--header")) {
 521                         revs.verbose_header = 1;
 522                         continue;
 523                 }
 524                 if (!strcmp(arg, "--timestamp")) {
 525                         info.show_timestamp = 1;
 526                         continue;
 527                 }
 528                 if (!strcmp(arg, "--bisect")) {
 529                         bisect_list = 1;
 530                         continue;
 531                 }
 532                 if (!strcmp(arg, "--bisect-all")) {
 533                         bisect_list = 1;
 534                         bisect_find_all = 1;
 535                         info.flags |= BISECT_SHOW_ALL;
 536                         revs.show_decorations = 1;
 537                         continue;
 538                 }
 539                 if (!strcmp(arg, "--bisect-vars")) {
 540                         bisect_list = 1;
 541                         bisect_show_vars = 1;
 542                         continue;
 543                 }
 544                 if (!strcmp(arg, "--use-bitmap-index")) {
 545                         use_bitmap_index = 1;
 546                         continue;
 547                 }
 548                 if (!strcmp(arg, "--test-bitmap")) {
 549                         test_bitmap_walk(&revs);
 550                         return 0;
 551                 }
 552                 if (skip_prefix(arg, "--progress=", &arg)) {
 553                         show_progress = arg;
 554                         continue;
 555                 }
 556
 557                 if (skip_prefix(arg, ("--" CL_ARG__FILTER "="), &arg)) {
 558                         parse_list_objects_filter(&filter_options, arg);
 559                         if (filter_options.choice && !revs.blob_objects)
 560                                 die(_("object filtering requires --objects"));
 561                         continue;
 562                 }
 563                 if (!strcmp(arg, ("--no-" CL_ARG__FILTER))) {
 564                         list_objects_filter_set_no_filter(&filter_options);
 565                         continue;
 566                 }
 567                 if (!strcmp(arg, "--filter-print-omitted")) {
 568                         arg_print_omitted = 1;
 569                         continue;
 570                 }
 571
 572                 if (!strcmp(arg, "--exclude-promisor-objects"))
 573                         continue; /* already handled above */
 574                 if (skip_prefix(arg, "--missing=", &arg))
 575                         continue; /* already handled above */
 576
 577                 if (!strcmp(arg, ("--no-object-names"))) {
 578                         arg_show_object_names = 0;
 579                         continue;
 580                 }
 581
 582                 if (!strcmp(arg, ("--object-names"))) {
 583                         arg_show_object_names = 1;
 584                         continue;
 585                 }
 586
 587                 usage(rev_list_usage);
 588
 589         }
 590         if (revs.commit_format != CMIT_FMT_UNSPECIFIED) {
 591                 /* The command line has a --pretty  */
 592                 info.hdr_termination = '\n';
 593                 if (revs.commit_format == CMIT_FMT_ONELINE)
 594                         info.header_prefix = "";
 595                 else
 596                         info.header_prefix = "commit ";
 597         }
 598         else if (revs.verbose_header)
 599                 /* Only --header was specified */
 600                 revs.commit_format = CMIT_FMT_RAW;
 601
 602         if ((!revs.commits && reflog_walk_empty(revs.reflog_info) &&
 603              (!(revs.tag_objects || revs.tree_objects || revs.blob_objects) &&
 604               !revs.pending.nr) &&
 605              !revs.rev_input_given && !revs.read_from_stdin) ||
 606             revs.diff)
 607                 usage(rev_list_usage);
 608
 609         if (revs.show_notes)
 610                 die(_("rev-list does not support display of notes"));
 611
 612         if (revs.count &&
 613             (revs.tag_objects || revs.tree_objects || revs.blob_objects) &&
 614             (revs.left_right || revs.cherry_mark))
 615                 die(_("marked counting is incompatible with --objects"));
 616
 617         save_commit_buffer = (revs.verbose_header ||
 618                               revs.grep_filter.pattern_list ||
 619                               revs.grep_filter.header_list);
 620         if (bisect_list)
 621                 revs.limited = 1;
 622
 623         if (show_progress)
 624                 progress = start_delayed_progress(show_progress, 0);
 625
 626         if (use_bitmap_index) {
 627                 if (!try_bitmap_count(&revs, &filter_options))
 628                         return 0;
 629                 if (!try_bitmap_traversal(&revs, &filter_options))
 630                         return 0;
 631         }
 632
 633         if (prepare_revision_walk(&revs))
 634                 die("revision walk setup failed");
 635         if (revs.tree_objects)
 636                 mark_edges_uninteresting(&revs, show_edge, 0);
 637
 638         if (bisect_list) {
 639                 int reaches, all;
 640                 unsigned bisect_flags = 0;
 641
 642                 if (bisect_find_all)
 643                         bisect_flags |= FIND_BISECTION_ALL;
 644
 645                 if (revs.first_parent_only)
 646                         bisect_flags |= FIND_BISECTION_FIRST_PARENT_ONLY;
 647
 648                 find_bisection(&revs.commits, &reaches, &all, bisect_flags);
 649
 650                 if (bisect_show_vars)
 651                         return show_bisect_vars(&info, reaches, all);
 652         }
 653
 654         if (arg_print_omitted)
 655                 oidset_init(&omitted_objects, DEFAULT_OIDSET_SIZE);
 656         if (arg_missing_action == MA_PRINT)
 657                 oidset_init(&missing_objects, DEFAULT_OIDSET_SIZE);
 658
 659         traverse_commit_list_filtered(
 660                 &filter_options, &revs, show_commit, show_object, &info,
 661                 (arg_print_omitted ? &omitted_objects : NULL));
 662
 663         if (arg_print_omitted) {
 664                 struct oidset_iter iter;
 665                 struct object_id *oid;
 666                 oidset_iter_init(&omitted_objects, &iter);
 667                 while ((oid = oidset_iter_next(&iter)))
 668                         printf("~%s\n", oid_to_hex(oid));
 669                 oidset_clear(&omitted_objects);
 670         }
 671         if (arg_missing_action == MA_PRINT) {
 672                 struct oidset_iter iter;
 673                 struct object_id *oid;
 674                 oidset_iter_init(&missing_objects, &iter);
 675                 while ((oid = oidset_iter_next(&iter)))
 676                         printf("?%s\n", oid_to_hex(oid));
 677                 oidset_clear(&missing_objects);
 678         }
 679
 680         stop_progress(&progress);
 681
 682         if (revs.count) {
 683                 if (revs.left_right && revs.cherry_mark)
 684                         printf("%d\t%d\t%d\n", revs.count_left, revs.count_right, revs.count_same);
 685                 else if (revs.left_right)
 686                         printf("%d\t%d\n", revs.count_left, revs.count_right);
 687                 else if (revs.cherry_mark)
 688                         printf("%d\t%d\n", revs.count_left + revs.count_right, revs.count_same);
 689                 else
 690                         printf("%d\n", revs.count_left + revs.count_right);
 691         }
 692
 693         return 0;
 694 }