revision.con commit Reduce the number of connects when fetching (ba22785)
   1#include "cache.h"
   2#include "tag.h"
   3#include "blob.h"
   4#include "tree.h"
   5#include "commit.h"
   6#include "diff.h"
   7#include "refs.h"
   8#include "revision.h"
   9#include "grep.h"
  10#include "reflog-walk.h"
  11#include "patch-ids.h"
  12
  13volatile show_early_output_fn_t show_early_output;
  14
  15static char *path_name(struct name_path *path, const char *name)
  16{
  17        struct name_path *p;
  18        char *n, *m;
  19        int nlen = strlen(name);
  20        int len = nlen + 1;
  21
  22        for (p = path; p; p = p->up) {
  23                if (p->elem_len)
  24                        len += p->elem_len + 1;
  25        }
  26        n = xmalloc(len);
  27        m = n + len - (nlen + 1);
  28        strcpy(m, name);
  29        for (p = path; p; p = p->up) {
  30                if (p->elem_len) {
  31                        m -= p->elem_len + 1;
  32                        memcpy(m, p->elem, p->elem_len);
  33                        m[p->elem_len] = '/';
  34                }
  35        }
  36        return n;
  37}
  38
  39void add_object(struct object *obj,
  40                struct object_array *p,
  41                struct name_path *path,
  42                const char *name)
  43{
  44        add_object_array(obj, path_name(path, name), p);
  45}
  46
  47static void mark_blob_uninteresting(struct blob *blob)
  48{
  49        if (blob->object.flags & UNINTERESTING)
  50                return;
  51        blob->object.flags |= UNINTERESTING;
  52}
  53
  54void mark_tree_uninteresting(struct tree *tree)
  55{
  56        struct tree_desc desc;
  57        struct name_entry entry;
  58        struct object *obj = &tree->object;
  59
  60        if (obj->flags & UNINTERESTING)
  61                return;
  62        obj->flags |= UNINTERESTING;
  63        if (!has_sha1_file(obj->sha1))
  64                return;
  65        if (parse_tree(tree) < 0)
  66                die("bad tree %s", sha1_to_hex(obj->sha1));
  67
  68        init_tree_desc(&desc, tree->buffer, tree->size);
  69        while (tree_entry(&desc, &entry)) {
  70                switch (object_type(entry.mode)) {
  71                case OBJ_TREE:
  72                        mark_tree_uninteresting(lookup_tree(entry.sha1));
  73                        break;
  74                case OBJ_BLOB:
  75                        mark_blob_uninteresting(lookup_blob(entry.sha1));
  76                        break;
  77                default:
  78                        /* Subproject commit - not in this repository */
  79                        break;
  80                }
  81        }
  82
  83        /*
  84         * We don't care about the tree any more
  85         * after it has been marked uninteresting.
  86         */
  87        free(tree->buffer);
  88        tree->buffer = NULL;
  89}
  90
  91void mark_parents_uninteresting(struct commit *commit)
  92{
  93        struct commit_list *parents = commit->parents;
  94
  95        while (parents) {
  96                struct commit *commit = parents->item;
  97                if (!(commit->object.flags & UNINTERESTING)) {
  98                        commit->object.flags |= UNINTERESTING;
  99
 100                        /*
 101                         * Normally we haven't parsed the parent
 102                         * yet, so we won't have a parent of a parent
 103                         * here. However, it may turn out that we've
 104                         * reached this commit some other way (where it
 105                         * wasn't uninteresting), in which case we need
 106                         * to mark its parents recursively too..
 107                         */
 108                        if (commit->parents)
 109                                mark_parents_uninteresting(commit);
 110                }
 111
 112                /*
 113                 * A missing commit is ok iff its parent is marked
 114                 * uninteresting.
 115                 *
 116                 * We just mark such a thing parsed, so that when
 117                 * it is popped next time around, we won't be trying
 118                 * to parse it and get an error.
 119                 */
 120                if (!has_sha1_file(commit->object.sha1))
 121                        commit->object.parsed = 1;
 122                parents = parents->next;
 123        }
 124}
 125
 126static void add_pending_object_with_mode(struct rev_info *revs, struct object *obj, const char *name, unsigned mode)
 127{
 128        if (revs->no_walk && (obj->flags & UNINTERESTING))
 129                die("object ranges do not make sense when not walking revisions");
 130        if (revs->reflog_info && obj->type == OBJ_COMMIT &&
 131                        add_reflog_for_walk(revs->reflog_info,
 132                                (struct commit *)obj, name))
 133                return;
 134        add_object_array_with_mode(obj, name, &revs->pending, mode);
 135}
 136
 137void add_pending_object(struct rev_info *revs, struct object *obj, const char *name)
 138{
 139        add_pending_object_with_mode(revs, obj, name, S_IFINVALID);
 140}
 141
 142void add_head_to_pending(struct rev_info *revs)
 143{
 144        unsigned char sha1[20];
 145        struct object *obj;
 146        if (get_sha1("HEAD", sha1))
 147                return;
 148        obj = parse_object(sha1);
 149        if (!obj)
 150                return;
 151        add_pending_object(revs, obj, "HEAD");
 152}
 153
 154static struct object *get_reference(struct rev_info *revs, const char *name, const unsigned char *sha1, unsigned int flags)
 155{
 156        struct object *object;
 157
 158        object = parse_object(sha1);
 159        if (!object)
 160                die("bad object %s", name);
 161        object->flags |= flags;
 162        return object;
 163}
 164
 165static struct commit *handle_commit(struct rev_info *revs, struct object *object, const char *name)
 166{
 167        unsigned long flags = object->flags;
 168
 169        /*
 170         * Tag object? Look what it points to..
 171         */
 172        while (object->type == OBJ_TAG) {
 173                struct tag *tag = (struct tag *) object;
 174                if (revs->tag_objects && !(flags & UNINTERESTING))
 175                        add_pending_object(revs, object, tag->tag);
 176                object = parse_object(tag->tagged->sha1);
 177                if (!object)
 178                        die("bad object %s", sha1_to_hex(tag->tagged->sha1));
 179        }
 180
 181        /*
 182         * Commit object? Just return it, we'll do all the complex
 183         * reachability crud.
 184         */
 185        if (object->type == OBJ_COMMIT) {
 186                struct commit *commit = (struct commit *)object;
 187                if (parse_commit(commit) < 0)
 188                        die("unable to parse commit %s", name);
 189                if (flags & UNINTERESTING) {
 190                        commit->object.flags |= UNINTERESTING;
 191                        mark_parents_uninteresting(commit);
 192                        revs->limited = 1;
 193                }
 194                return commit;
 195        }
 196
 197        /*
 198         * Tree object? Either mark it uniniteresting, or add it
 199         * to the list of objects to look at later..
 200         */
 201        if (object->type == OBJ_TREE) {
 202                struct tree *tree = (struct tree *)object;
 203                if (!revs->tree_objects)
 204                        return NULL;
 205                if (flags & UNINTERESTING) {
 206                        mark_tree_uninteresting(tree);
 207                        return NULL;
 208                }
 209                add_pending_object(revs, object, "");
 210                return NULL;
 211        }
 212
 213        /*
 214         * Blob object? You know the drill by now..
 215         */
 216        if (object->type == OBJ_BLOB) {
 217                struct blob *blob = (struct blob *)object;
 218                if (!revs->blob_objects)
 219                        return NULL;
 220                if (flags & UNINTERESTING) {
 221                        mark_blob_uninteresting(blob);
 222                        return NULL;
 223                }
 224                add_pending_object(revs, object, "");
 225                return NULL;
 226        }
 227        die("%s is unknown object", name);
 228}
 229
 230static int everybody_uninteresting(struct commit_list *orig)
 231{
 232        struct commit_list *list = orig;
 233        while (list) {
 234                struct commit *commit = list->item;
 235                list = list->next;
 236                if (commit->object.flags & UNINTERESTING)
 237                        continue;
 238                return 0;
 239        }
 240        return 1;
 241}
 242
 243/*
 244 * The goal is to get REV_TREE_NEW as the result only if the
 245 * diff consists of all '+' (and no other changes), and
 246 * REV_TREE_DIFFERENT otherwise (of course if the trees are
 247 * the same we want REV_TREE_SAME).  That means that once we
 248 * get to REV_TREE_DIFFERENT, we do not have to look any further.
 249 */
 250static int tree_difference = REV_TREE_SAME;
 251
 252static void file_add_remove(struct diff_options *options,
 253                    int addremove, unsigned mode,
 254                    const unsigned char *sha1,
 255                    const char *base, const char *path)
 256{
 257        int diff = REV_TREE_DIFFERENT;
 258
 259        /*
 260         * Is it an add of a new file? It means that the old tree
 261         * didn't have it at all, so we will turn "REV_TREE_SAME" ->
 262         * "REV_TREE_NEW", but leave any "REV_TREE_DIFFERENT" alone
 263         * (and if it already was "REV_TREE_NEW", we'll keep it
 264         * "REV_TREE_NEW" of course).
 265         */
 266        if (addremove == '+') {
 267                diff = tree_difference;
 268                if (diff != REV_TREE_SAME)
 269                        return;
 270                diff = REV_TREE_NEW;
 271        }
 272        tree_difference = diff;
 273        if (tree_difference == REV_TREE_DIFFERENT)
 274                DIFF_OPT_SET(options, HAS_CHANGES);
 275}
 276
 277static void file_change(struct diff_options *options,
 278                 unsigned old_mode, unsigned new_mode,
 279                 const unsigned char *old_sha1,
 280                 const unsigned char *new_sha1,
 281                 const char *base, const char *path)
 282{
 283        tree_difference = REV_TREE_DIFFERENT;
 284        DIFF_OPT_SET(options, HAS_CHANGES);
 285}
 286
 287static int rev_compare_tree(struct rev_info *revs, struct tree *t1, struct tree *t2)
 288{
 289        if (!t1)
 290                return REV_TREE_NEW;
 291        if (!t2)
 292                return REV_TREE_DIFFERENT;
 293        tree_difference = REV_TREE_SAME;
 294        DIFF_OPT_CLR(&revs->pruning, HAS_CHANGES);
 295        if (diff_tree_sha1(t1->object.sha1, t2->object.sha1, "",
 296                           &revs->pruning) < 0)
 297                return REV_TREE_DIFFERENT;
 298        return tree_difference;
 299}
 300
 301static int rev_same_tree_as_empty(struct rev_info *revs, struct tree *t1)
 302{
 303        int retval;
 304        void *tree;
 305        unsigned long size;
 306        struct tree_desc empty, real;
 307
 308        if (!t1)
 309                return 0;
 310
 311        tree = read_object_with_reference(t1->object.sha1, tree_type, &size, NULL);
 312        if (!tree)
 313                return 0;
 314        init_tree_desc(&real, tree, size);
 315        init_tree_desc(&empty, "", 0);
 316
 317        tree_difference = REV_TREE_SAME;
 318        DIFF_OPT_CLR(&revs->pruning, HAS_CHANGES);
 319        retval = diff_tree(&empty, &real, "", &revs->pruning);
 320        free(tree);
 321
 322        return retval >= 0 && (tree_difference == REV_TREE_SAME);
 323}
 324
 325static void try_to_simplify_commit(struct rev_info *revs, struct commit *commit)
 326{
 327        struct commit_list **pp, *parent;
 328        int tree_changed = 0, tree_same = 0;
 329
 330        /*
 331         * If we don't do pruning, everything is interesting
 332         */
 333        if (!revs->prune)
 334                return;
 335
 336        if (!commit->tree)
 337                return;
 338
 339        if (!commit->parents) {
 340                if (rev_same_tree_as_empty(revs, commit->tree))
 341                        commit->object.flags |= TREESAME;
 342                return;
 343        }
 344
 345        /*
 346         * Normal non-merge commit? If we don't want to make the
 347         * history dense, we consider it always to be a change..
 348         */
 349        if (!revs->dense && !commit->parents->next)
 350                return;
 351
 352        pp = &commit->parents;
 353        while ((parent = *pp) != NULL) {
 354                struct commit *p = parent->item;
 355
 356                if (parse_commit(p) < 0)
 357                        die("cannot simplify commit %s (because of %s)",
 358                            sha1_to_hex(commit->object.sha1),
 359                            sha1_to_hex(p->object.sha1));
 360                switch (rev_compare_tree(revs, p->tree, commit->tree)) {
 361                case REV_TREE_SAME:
 362                        tree_same = 1;
 363                        if (!revs->simplify_history || (p->object.flags & UNINTERESTING)) {
 364                                /* Even if a merge with an uninteresting
 365                                 * side branch brought the entire change
 366                                 * we are interested in, we do not want
 367                                 * to lose the other branches of this
 368                                 * merge, so we just keep going.
 369                                 */
 370                                pp = &parent->next;
 371                                continue;
 372                        }
 373                        parent->next = NULL;
 374                        commit->parents = parent;
 375                        commit->object.flags |= TREESAME;
 376                        return;
 377
 378                case REV_TREE_NEW:
 379                        if (revs->remove_empty_trees &&
 380                            rev_same_tree_as_empty(revs, p->tree)) {
 381                                /* We are adding all the specified
 382                                 * paths from this parent, so the
 383                                 * history beyond this parent is not
 384                                 * interesting.  Remove its parents
 385                                 * (they are grandparents for us).
 386                                 * IOW, we pretend this parent is a
 387                                 * "root" commit.
 388                                 */
 389                                if (parse_commit(p) < 0)
 390                                        die("cannot simplify commit %s (invalid %s)",
 391                                            sha1_to_hex(commit->object.sha1),
 392                                            sha1_to_hex(p->object.sha1));
 393                                p->parents = NULL;
 394                        }
 395                /* fallthrough */
 396                case REV_TREE_DIFFERENT:
 397                        tree_changed = 1;
 398                        pp = &parent->next;
 399                        continue;
 400                }
 401                die("bad tree compare for commit %s", sha1_to_hex(commit->object.sha1));
 402        }
 403        if (tree_changed && !tree_same)
 404                return;
 405        commit->object.flags |= TREESAME;
 406}
 407
 408static int add_parents_to_list(struct rev_info *revs, struct commit *commit, struct commit_list **list)
 409{
 410        struct commit_list *parent = commit->parents;
 411        unsigned left_flag;
 412        int add, rest;
 413
 414        if (commit->object.flags & ADDED)
 415                return 0;
 416        commit->object.flags |= ADDED;
 417
 418        /*
 419         * If the commit is uninteresting, don't try to
 420         * prune parents - we want the maximal uninteresting
 421         * set.
 422         *
 423         * Normally we haven't parsed the parent
 424         * yet, so we won't have a parent of a parent
 425         * here. However, it may turn out that we've
 426         * reached this commit some other way (where it
 427         * wasn't uninteresting), in which case we need
 428         * to mark its parents recursively too..
 429         */
 430        if (commit->object.flags & UNINTERESTING) {
 431                while (parent) {
 432                        struct commit *p = parent->item;
 433                        parent = parent->next;
 434                        if (parse_commit(p) < 0)
 435                                return -1;
 436                        p->object.flags |= UNINTERESTING;
 437                        if (p->parents)
 438                                mark_parents_uninteresting(p);
 439                        if (p->object.flags & SEEN)
 440                                continue;
 441                        p->object.flags |= SEEN;
 442                        insert_by_date(p, list);
 443                }
 444                return 0;
 445        }
 446
 447        /*
 448         * Ok, the commit wasn't uninteresting. Try to
 449         * simplify the commit history and find the parent
 450         * that has no differences in the path set if one exists.
 451         */
 452        try_to_simplify_commit(revs, commit);
 453
 454        if (revs->no_walk)
 455                return 0;
 456
 457        left_flag = (commit->object.flags & SYMMETRIC_LEFT);
 458
 459        rest = !revs->first_parent_only;
 460        for (parent = commit->parents, add = 1; parent; add = rest) {
 461                struct commit *p = parent->item;
 462
 463                parent = parent->next;
 464                if (parse_commit(p) < 0)
 465                        return -1;
 466                p->object.flags |= left_flag;
 467                if (p->object.flags & SEEN)
 468                        continue;
 469                p->object.flags |= SEEN;
 470                if (add)
 471                        insert_by_date(p, list);
 472        }
 473        return 0;
 474}
 475
 476static void cherry_pick_list(struct commit_list *list, struct rev_info *revs)
 477{
 478        struct commit_list *p;
 479        int left_count = 0, right_count = 0;
 480        int left_first;
 481        struct patch_ids ids;
 482
 483        /* First count the commits on the left and on the right */
 484        for (p = list; p; p = p->next) {
 485                struct commit *commit = p->item;
 486                unsigned flags = commit->object.flags;
 487                if (flags & BOUNDARY)
 488                        ;
 489                else if (flags & SYMMETRIC_LEFT)
 490                        left_count++;
 491                else
 492                        right_count++;
 493        }
 494
 495        left_first = left_count < right_count;
 496        init_patch_ids(&ids);
 497        if (revs->diffopt.nr_paths) {
 498                ids.diffopts.nr_paths = revs->diffopt.nr_paths;
 499                ids.diffopts.paths = revs->diffopt.paths;
 500                ids.diffopts.pathlens = revs->diffopt.pathlens;
 501        }
 502
 503        /* Compute patch-ids for one side */
 504        for (p = list; p; p = p->next) {
 505                struct commit *commit = p->item;
 506                unsigned flags = commit->object.flags;
 507
 508                if (flags & BOUNDARY)
 509                        continue;
 510                /*
 511                 * If we have fewer left, left_first is set and we omit
 512                 * commits on the right branch in this loop.  If we have
 513                 * fewer right, we skip the left ones.
 514                 */
 515                if (left_first != !!(flags & SYMMETRIC_LEFT))
 516                        continue;
 517                commit->util = add_commit_patch_id(commit, &ids);
 518        }
 519
 520        /* Check the other side */
 521        for (p = list; p; p = p->next) {
 522                struct commit *commit = p->item;
 523                struct patch_id *id;
 524                unsigned flags = commit->object.flags;
 525
 526                if (flags & BOUNDARY)
 527                        continue;
 528                /*
 529                 * If we have fewer left, left_first is set and we omit
 530                 * commits on the left branch in this loop.
 531                 */
 532                if (left_first == !!(flags & SYMMETRIC_LEFT))
 533                        continue;
 534
 535                /*
 536                 * Have we seen the same patch id?
 537                 */
 538                id = has_commit_patch_id(commit, &ids);
 539                if (!id)
 540                        continue;
 541                id->seen = 1;
 542                commit->object.flags |= SHOWN;
 543        }
 544
 545        /* Now check the original side for seen ones */
 546        for (p = list; p; p = p->next) {
 547                struct commit *commit = p->item;
 548                struct patch_id *ent;
 549
 550                ent = commit->util;
 551                if (!ent)
 552                        continue;
 553                if (ent->seen)
 554                        commit->object.flags |= SHOWN;
 555                commit->util = NULL;
 556        }
 557
 558        free_patch_ids(&ids);
 559}
 560
 561static int limit_list(struct rev_info *revs)
 562{
 563        struct commit_list *list = revs->commits;
 564        struct commit_list *newlist = NULL;
 565        struct commit_list **p = &newlist;
 566
 567        while (list) {
 568                struct commit_list *entry = list;
 569                struct commit *commit = list->item;
 570                struct object *obj = &commit->object;
 571                show_early_output_fn_t show;
 572
 573                list = list->next;
 574                free(entry);
 575
 576                if (revs->max_age != -1 && (commit->date < revs->max_age))
 577                        obj->flags |= UNINTERESTING;
 578                if (add_parents_to_list(revs, commit, &list) < 0)
 579                        return -1;
 580                if (obj->flags & UNINTERESTING) {
 581                        mark_parents_uninteresting(commit);
 582                        if (everybody_uninteresting(list))
 583                                break;
 584                        continue;
 585                }
 586                if (revs->min_age != -1 && (commit->date > revs->min_age))
 587                        continue;
 588                p = &commit_list_insert(commit, p)->next;
 589
 590                show = show_early_output;
 591                if (!show)
 592                        continue;
 593
 594                show(revs, newlist);
 595                show_early_output = NULL;
 596        }
 597        if (revs->cherry_pick)
 598                cherry_pick_list(newlist, revs);
 599
 600        revs->commits = newlist;
 601        return 0;
 602}
 603
 604struct all_refs_cb {
 605        int all_flags;
 606        int warned_bad_reflog;
 607        struct rev_info *all_revs;
 608        const char *name_for_errormsg;
 609};
 610
 611static int handle_one_ref(const char *path, const unsigned char *sha1, int flag, void *cb_data)
 612{
 613        struct all_refs_cb *cb = cb_data;
 614        struct object *object = get_reference(cb->all_revs, path, sha1,
 615                                              cb->all_flags);
 616        add_pending_object(cb->all_revs, object, path);
 617        return 0;
 618}
 619
 620static void handle_all(struct rev_info *revs, unsigned flags)
 621{
 622        struct all_refs_cb cb;
 623        cb.all_revs = revs;
 624        cb.all_flags = flags;
 625        for_each_ref(handle_one_ref, &cb);
 626}
 627
 628static void handle_one_reflog_commit(unsigned char *sha1, void *cb_data)
 629{
 630        struct all_refs_cb *cb = cb_data;
 631        if (!is_null_sha1(sha1)) {
 632                struct object *o = parse_object(sha1);
 633                if (o) {
 634                        o->flags |= cb->all_flags;
 635                        add_pending_object(cb->all_revs, o, "");
 636                }
 637                else if (!cb->warned_bad_reflog) {
 638                        warning("reflog of '%s' references pruned commits",
 639                                cb->name_for_errormsg);
 640                        cb->warned_bad_reflog = 1;
 641                }
 642        }
 643}
 644
 645static int handle_one_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
 646                const char *email, unsigned long timestamp, int tz,
 647                const char *message, void *cb_data)
 648{
 649        handle_one_reflog_commit(osha1, cb_data);
 650        handle_one_reflog_commit(nsha1, cb_data);
 651        return 0;
 652}
 653
 654static int handle_one_reflog(const char *path, const unsigned char *sha1, int flag, void *cb_data)
 655{
 656        struct all_refs_cb *cb = cb_data;
 657        cb->warned_bad_reflog = 0;
 658        cb->name_for_errormsg = path;
 659        for_each_reflog_ent(path, handle_one_reflog_ent, cb_data);
 660        return 0;
 661}
 662
 663static void handle_reflog(struct rev_info *revs, unsigned flags)
 664{
 665        struct all_refs_cb cb;
 666        cb.all_revs = revs;
 667        cb.all_flags = flags;
 668        for_each_reflog(handle_one_reflog, &cb);
 669}
 670
 671static int add_parents_only(struct rev_info *revs, const char *arg, int flags)
 672{
 673        unsigned char sha1[20];
 674        struct object *it;
 675        struct commit *commit;
 676        struct commit_list *parents;
 677
 678        if (*arg == '^') {
 679                flags ^= UNINTERESTING;
 680                arg++;
 681        }
 682        if (get_sha1(arg, sha1))
 683                return 0;
 684        while (1) {
 685                it = get_reference(revs, arg, sha1, 0);
 686                if (it->type != OBJ_TAG)
 687                        break;
 688                hashcpy(sha1, ((struct tag*)it)->tagged->sha1);
 689        }
 690        if (it->type != OBJ_COMMIT)
 691                return 0;
 692        commit = (struct commit *)it;
 693        for (parents = commit->parents; parents; parents = parents->next) {
 694                it = &parents->item->object;
 695                it->flags |= flags;
 696                add_pending_object(revs, it, arg);
 697        }
 698        return 1;
 699}
 700
 701void init_revisions(struct rev_info *revs, const char *prefix)
 702{
 703        memset(revs, 0, sizeof(*revs));
 704
 705        revs->abbrev = DEFAULT_ABBREV;
 706        revs->ignore_merges = 1;
 707        revs->simplify_history = 1;
 708        DIFF_OPT_SET(&revs->pruning, RECURSIVE);
 709        DIFF_OPT_SET(&revs->pruning, QUIET);
 710        revs->pruning.add_remove = file_add_remove;
 711        revs->pruning.change = file_change;
 712        revs->lifo = 1;
 713        revs->dense = 1;
 714        revs->prefix = prefix;
 715        revs->max_age = -1;
 716        revs->min_age = -1;
 717        revs->skip_count = -1;
 718        revs->max_count = -1;
 719
 720        revs->commit_format = CMIT_FMT_DEFAULT;
 721
 722        diff_setup(&revs->diffopt);
 723}
 724
 725static void add_pending_commit_list(struct rev_info *revs,
 726                                    struct commit_list *commit_list,
 727                                    unsigned int flags)
 728{
 729        while (commit_list) {
 730                struct object *object = &commit_list->item->object;
 731                object->flags |= flags;
 732                add_pending_object(revs, object, sha1_to_hex(object->sha1));
 733                commit_list = commit_list->next;
 734        }
 735}
 736
 737static void prepare_show_merge(struct rev_info *revs)
 738{
 739        struct commit_list *bases;
 740        struct commit *head, *other;
 741        unsigned char sha1[20];
 742        const char **prune = NULL;
 743        int i, prune_num = 1; /* counting terminating NULL */
 744
 745        if (get_sha1("HEAD", sha1) || !(head = lookup_commit(sha1)))
 746                die("--merge without HEAD?");
 747        if (get_sha1("MERGE_HEAD", sha1) || !(other = lookup_commit(sha1)))
 748                die("--merge without MERGE_HEAD?");
 749        add_pending_object(revs, &head->object, "HEAD");
 750        add_pending_object(revs, &other->object, "MERGE_HEAD");
 751        bases = get_merge_bases(head, other, 1);
 752        while (bases) {
 753                struct commit *it = bases->item;
 754                struct commit_list *n = bases->next;
 755                free(bases);
 756                bases = n;
 757                it->object.flags |= UNINTERESTING;
 758                add_pending_object(revs, &it->object, "(merge-base)");
 759        }
 760
 761        if (!active_nr)
 762                read_cache();
 763        for (i = 0; i < active_nr; i++) {
 764                struct cache_entry *ce = active_cache[i];
 765                if (!ce_stage(ce))
 766                        continue;
 767                if (ce_path_match(ce, revs->prune_data)) {
 768                        prune_num++;
 769                        prune = xrealloc(prune, sizeof(*prune) * prune_num);
 770                        prune[prune_num-2] = ce->name;
 771                        prune[prune_num-1] = NULL;
 772                }
 773                while ((i+1 < active_nr) &&
 774                       ce_same_name(ce, active_cache[i+1]))
 775                        i++;
 776        }
 777        revs->prune_data = prune;
 778}
 779
 780int handle_revision_arg(const char *arg, struct rev_info *revs,
 781                        int flags,
 782                        int cant_be_filename)
 783{
 784        unsigned mode;
 785        char *dotdot;
 786        struct object *object;
 787        unsigned char sha1[20];
 788        int local_flags;
 789
 790        dotdot = strstr(arg, "..");
 791        if (dotdot) {
 792                unsigned char from_sha1[20];
 793                const char *next = dotdot + 2;
 794                const char *this = arg;
 795                int symmetric = *next == '.';
 796                unsigned int flags_exclude = flags ^ UNINTERESTING;
 797
 798                *dotdot = 0;
 799                next += symmetric;
 800
 801                if (!*next)
 802                        next = "HEAD";
 803                if (dotdot == arg)
 804                        this = "HEAD";
 805                if (!get_sha1(this, from_sha1) &&
 806                    !get_sha1(next, sha1)) {
 807                        struct commit *a, *b;
 808                        struct commit_list *exclude;
 809
 810                        a = lookup_commit_reference(from_sha1);
 811                        b = lookup_commit_reference(sha1);
 812                        if (!a || !b) {
 813                                die(symmetric ?
 814                                    "Invalid symmetric difference expression %s...%s" :
 815                                    "Invalid revision range %s..%s",
 816                                    arg, next);
 817                        }
 818
 819                        if (!cant_be_filename) {
 820                                *dotdot = '.';
 821                                verify_non_filename(revs->prefix, arg);
 822                        }
 823
 824                        if (symmetric) {
 825                                exclude = get_merge_bases(a, b, 1);
 826                                add_pending_commit_list(revs, exclude,
 827                                                        flags_exclude);
 828                                free_commit_list(exclude);
 829                                a->object.flags |= flags | SYMMETRIC_LEFT;
 830                        } else
 831                                a->object.flags |= flags_exclude;
 832                        b->object.flags |= flags;
 833                        add_pending_object(revs, &a->object, this);
 834                        add_pending_object(revs, &b->object, next);
 835                        return 0;
 836                }
 837                *dotdot = '.';
 838        }
 839        dotdot = strstr(arg, "^@");
 840        if (dotdot && !dotdot[2]) {
 841                *dotdot = 0;
 842                if (add_parents_only(revs, arg, flags))
 843                        return 0;
 844                *dotdot = '^';
 845        }
 846        dotdot = strstr(arg, "^!");
 847        if (dotdot && !dotdot[2]) {
 848                *dotdot = 0;
 849                if (!add_parents_only(revs, arg, flags ^ UNINTERESTING))
 850                        *dotdot = '^';
 851        }
 852
 853        local_flags = 0;
 854        if (*arg == '^') {
 855                local_flags = UNINTERESTING;
 856                arg++;
 857        }
 858        if (get_sha1_with_mode(arg, sha1, &mode))
 859                return -1;
 860        if (!cant_be_filename)
 861                verify_non_filename(revs->prefix, arg);
 862        object = get_reference(revs, arg, sha1, flags ^ local_flags);
 863        add_pending_object_with_mode(revs, object, arg, mode);
 864        return 0;
 865}
 866
 867static void add_grep(struct rev_info *revs, const char *ptn, enum grep_pat_token what)
 868{
 869        if (!revs->grep_filter) {
 870                struct grep_opt *opt = xcalloc(1, sizeof(*opt));
 871                opt->status_only = 1;
 872                opt->pattern_tail = &(opt->pattern_list);
 873                opt->regflags = REG_NEWLINE;
 874                revs->grep_filter = opt;
 875        }
 876        append_grep_pattern(revs->grep_filter, ptn,
 877                            "command line", 0, what);
 878}
 879
 880static void add_header_grep(struct rev_info *revs, const char *field, const char *pattern)
 881{
 882        char *pat;
 883        const char *prefix;
 884        int patlen, fldlen;
 885
 886        fldlen = strlen(field);
 887        patlen = strlen(pattern);
 888        pat = xmalloc(patlen + fldlen + 10);
 889        prefix = ".*";
 890        if (*pattern == '^') {
 891                prefix = "";
 892                pattern++;
 893        }
 894        sprintf(pat, "^%s %s%s", field, prefix, pattern);
 895        add_grep(revs, pat, GREP_PATTERN_HEAD);
 896}
 897
 898static void add_message_grep(struct rev_info *revs, const char *pattern)
 899{
 900        add_grep(revs, pattern, GREP_PATTERN_BODY);
 901}
 902
 903static void add_ignore_packed(struct rev_info *revs, const char *name)
 904{
 905        int num = ++revs->num_ignore_packed;
 906
 907        revs->ignore_packed = xrealloc(revs->ignore_packed,
 908                                       sizeof(const char **) * (num + 1));
 909        revs->ignore_packed[num-1] = name;
 910        revs->ignore_packed[num] = NULL;
 911}
 912
 913/*
 914 * Parse revision information, filling in the "rev_info" structure,
 915 * and removing the used arguments from the argument list.
 916 *
 917 * Returns the number of arguments left that weren't recognized
 918 * (which are also moved to the head of the argument list)
 919 */
 920int setup_revisions(int argc, const char **argv, struct rev_info *revs, const char *def)
 921{
 922        int i, flags, seen_dashdash, show_merge;
 923        const char **unrecognized = argv + 1;
 924        int left = 1;
 925        int all_match = 0;
 926        int regflags = 0;
 927
 928        /* First, search for "--" */
 929        seen_dashdash = 0;
 930        for (i = 1; i < argc; i++) {
 931                const char *arg = argv[i];
 932                if (strcmp(arg, "--"))
 933                        continue;
 934                argv[i] = NULL;
 935                argc = i;
 936                if (argv[i + 1])
 937                        revs->prune_data = get_pathspec(revs->prefix, argv + i + 1);
 938                seen_dashdash = 1;
 939                break;
 940        }
 941
 942        flags = show_merge = 0;
 943        for (i = 1; i < argc; i++) {
 944                const char *arg = argv[i];
 945                if (*arg == '-') {
 946                        int opts;
 947                        if (!prefixcmp(arg, "--max-count=")) {
 948                                revs->max_count = atoi(arg + 12);
 949                                continue;
 950                        }
 951                        if (!prefixcmp(arg, "--skip=")) {
 952                                revs->skip_count = atoi(arg + 7);
 953                                continue;
 954                        }
 955                        /* accept -<digit>, like traditional "head" */
 956                        if ((*arg == '-') && isdigit(arg[1])) {
 957                                revs->max_count = atoi(arg + 1);
 958                                continue;
 959                        }
 960                        if (!strcmp(arg, "-n")) {
 961                                if (argc <= i + 1)
 962                                        die("-n requires an argument");
 963                                revs->max_count = atoi(argv[++i]);
 964                                continue;
 965                        }
 966                        if (!prefixcmp(arg, "-n")) {
 967                                revs->max_count = atoi(arg + 2);
 968                                continue;
 969                        }
 970                        if (!prefixcmp(arg, "--max-age=")) {
 971                                revs->max_age = atoi(arg + 10);
 972                                continue;
 973                        }
 974                        if (!prefixcmp(arg, "--since=")) {
 975                                revs->max_age = approxidate(arg + 8);
 976                                continue;
 977                        }
 978                        if (!prefixcmp(arg, "--after=")) {
 979                                revs->max_age = approxidate(arg + 8);
 980                                continue;
 981                        }
 982                        if (!prefixcmp(arg, "--min-age=")) {
 983                                revs->min_age = atoi(arg + 10);
 984                                continue;
 985                        }
 986                        if (!prefixcmp(arg, "--before=")) {
 987                                revs->min_age = approxidate(arg + 9);
 988                                continue;
 989                        }
 990                        if (!prefixcmp(arg, "--until=")) {
 991                                revs->min_age = approxidate(arg + 8);
 992                                continue;
 993                        }
 994                        if (!strcmp(arg, "--all")) {
 995                                handle_all(revs, flags);
 996                                continue;
 997                        }
 998                        if (!strcmp(arg, "--first-parent")) {
 999                                revs->first_parent_only = 1;
1000                                continue;
1001                        }
1002                        if (!strcmp(arg, "--reflog")) {
1003                                handle_reflog(revs, flags);
1004                                continue;
1005                        }
1006                        if (!strcmp(arg, "-g") ||
1007                                        !strcmp(arg, "--walk-reflogs")) {
1008                                init_reflog_walk(&revs->reflog_info);
1009                                continue;
1010                        }
1011                        if (!strcmp(arg, "--not")) {
1012                                flags ^= UNINTERESTING;
1013                                continue;
1014                        }
1015                        if (!strcmp(arg, "--default")) {
1016                                if (++i >= argc)
1017                                        die("bad --default argument");
1018                                def = argv[i];
1019                                continue;
1020                        }
1021                        if (!strcmp(arg, "--merge")) {
1022                                show_merge = 1;
1023                                continue;
1024                        }
1025                        if (!strcmp(arg, "--topo-order")) {
1026                                revs->topo_order = 1;
1027                                continue;
1028                        }
1029                        if (!strcmp(arg, "--date-order")) {
1030                                revs->lifo = 0;
1031                                revs->topo_order = 1;
1032                                continue;
1033                        }
1034                        if (!prefixcmp(arg, "--early-output")) {
1035                                int count = 100;
1036                                switch (arg[14]) {
1037                                case '=':
1038                                        count = atoi(arg+15);
1039                                        /* Fallthrough */
1040                                case 0:
1041                                        revs->topo_order = 1;
1042                                        revs->early_output = count;
1043                                        continue;
1044                                }
1045                        }
1046                        if (!strcmp(arg, "--parents")) {
1047                                revs->parents = 1;
1048                                continue;
1049                        }
1050                        if (!strcmp(arg, "--dense")) {
1051                                revs->dense = 1;
1052                                continue;
1053                        }
1054                        if (!strcmp(arg, "--sparse")) {
1055                                revs->dense = 0;
1056                                continue;
1057                        }
1058                        if (!strcmp(arg, "--remove-empty")) {
1059                                revs->remove_empty_trees = 1;
1060                                continue;
1061                        }
1062                        if (!strcmp(arg, "--no-merges")) {
1063                                revs->no_merges = 1;
1064                                continue;
1065                        }
1066                        if (!strcmp(arg, "--boundary")) {
1067                                revs->boundary = 1;
1068                                continue;
1069                        }
1070                        if (!strcmp(arg, "--left-right")) {
1071                                revs->left_right = 1;
1072                                continue;
1073                        }
1074                        if (!strcmp(arg, "--cherry-pick")) {
1075                                revs->cherry_pick = 1;
1076                                revs->limited = 1;
1077                                continue;
1078                        }
1079                        if (!strcmp(arg, "--objects")) {
1080                                revs->tag_objects = 1;
1081                                revs->tree_objects = 1;
1082                                revs->blob_objects = 1;
1083                                continue;
1084                        }
1085                        if (!strcmp(arg, "--objects-edge")) {
1086                                revs->tag_objects = 1;
1087                                revs->tree_objects = 1;
1088                                revs->blob_objects = 1;
1089                                revs->edge_hint = 1;
1090                                continue;
1091                        }
1092                        if (!strcmp(arg, "--unpacked")) {
1093                                revs->unpacked = 1;
1094                                free(revs->ignore_packed);
1095                                revs->ignore_packed = NULL;
1096                                revs->num_ignore_packed = 0;
1097                                continue;
1098                        }
1099                        if (!prefixcmp(arg, "--unpacked=")) {
1100                                revs->unpacked = 1;
1101                                add_ignore_packed(revs, arg+11);
1102                                continue;
1103                        }
1104                        if (!strcmp(arg, "-r")) {
1105                                revs->diff = 1;
1106                                DIFF_OPT_SET(&revs->diffopt, RECURSIVE);
1107                                continue;
1108                        }
1109                        if (!strcmp(arg, "-t")) {
1110                                revs->diff = 1;
1111                                DIFF_OPT_SET(&revs->diffopt, RECURSIVE);
1112                                DIFF_OPT_SET(&revs->diffopt, TREE_IN_RECURSIVE);
1113                                continue;
1114                        }
1115                        if (!strcmp(arg, "-m")) {
1116                                revs->ignore_merges = 0;
1117                                continue;
1118                        }
1119                        if (!strcmp(arg, "-c")) {
1120                                revs->diff = 1;
1121                                revs->dense_combined_merges = 0;
1122                                revs->combine_merges = 1;
1123                                continue;
1124                        }
1125                        if (!strcmp(arg, "--cc")) {
1126                                revs->diff = 1;
1127                                revs->dense_combined_merges = 1;
1128                                revs->combine_merges = 1;
1129                                continue;
1130                        }
1131                        if (!strcmp(arg, "-v")) {
1132                                revs->verbose_header = 1;
1133                                continue;
1134                        }
1135                        if (!prefixcmp(arg, "--pretty")) {
1136                                revs->verbose_header = 1;
1137                                revs->commit_format = get_commit_format(arg+8);
1138                                continue;
1139                        }
1140                        if (!strcmp(arg, "--root")) {
1141                                revs->show_root_diff = 1;
1142                                continue;
1143                        }
1144                        if (!strcmp(arg, "--no-commit-id")) {
1145                                revs->no_commit_id = 1;
1146                                continue;
1147                        }
1148                        if (!strcmp(arg, "--always")) {
1149                                revs->always_show_header = 1;
1150                                continue;
1151                        }
1152                        if (!strcmp(arg, "--no-abbrev")) {
1153                                revs->abbrev = 0;
1154                                continue;
1155                        }
1156                        if (!strcmp(arg, "--abbrev")) {
1157                                revs->abbrev = DEFAULT_ABBREV;
1158                                continue;
1159                        }
1160                        if (!prefixcmp(arg, "--abbrev=")) {
1161                                revs->abbrev = strtoul(arg + 9, NULL, 10);
1162                                if (revs->abbrev < MINIMUM_ABBREV)
1163                                        revs->abbrev = MINIMUM_ABBREV;
1164                                else if (revs->abbrev > 40)
1165                                        revs->abbrev = 40;
1166                                continue;
1167                        }
1168                        if (!strcmp(arg, "--abbrev-commit")) {
1169                                revs->abbrev_commit = 1;
1170                                continue;
1171                        }
1172                        if (!strcmp(arg, "--full-diff")) {
1173                                revs->diff = 1;
1174                                revs->full_diff = 1;
1175                                continue;
1176                        }
1177                        if (!strcmp(arg, "--full-history")) {
1178                                revs->simplify_history = 0;
1179                                continue;
1180                        }
1181                        if (!strcmp(arg, "--relative-date")) {
1182                                revs->date_mode = DATE_RELATIVE;
1183                                continue;
1184                        }
1185                        if (!strncmp(arg, "--date=", 7)) {
1186                                revs->date_mode = parse_date_format(arg + 7);
1187                                continue;
1188                        }
1189                        if (!strcmp(arg, "--log-size")) {
1190                                revs->show_log_size = 1;
1191                                continue;
1192                        }
1193
1194                        /*
1195                         * Grepping the commit log
1196                         */
1197                        if (!prefixcmp(arg, "--author=")) {
1198                                add_header_grep(revs, "author", arg+9);
1199                                continue;
1200                        }
1201                        if (!prefixcmp(arg, "--committer=")) {
1202                                add_header_grep(revs, "committer", arg+12);
1203                                continue;
1204                        }
1205                        if (!prefixcmp(arg, "--grep=")) {
1206                                add_message_grep(revs, arg+7);
1207                                continue;
1208                        }
1209                        if (!strcmp(arg, "--extended-regexp") ||
1210                            !strcmp(arg, "-E")) {
1211                                regflags |= REG_EXTENDED;
1212                                continue;
1213                        }
1214                        if (!strcmp(arg, "--regexp-ignore-case") ||
1215                            !strcmp(arg, "-i")) {
1216                                regflags |= REG_ICASE;
1217                                continue;
1218                        }
1219                        if (!strcmp(arg, "--all-match")) {
1220                                all_match = 1;
1221                                continue;
1222                        }
1223                        if (!prefixcmp(arg, "--encoding=")) {
1224                                arg += 11;
1225                                if (strcmp(arg, "none"))
1226                                        git_log_output_encoding = xstrdup(arg);
1227                                else
1228                                        git_log_output_encoding = "";
1229                                continue;
1230                        }
1231                        if (!strcmp(arg, "--reverse")) {
1232                                revs->reverse ^= 1;
1233                                continue;
1234                        }
1235                        if (!strcmp(arg, "--no-walk")) {
1236                                revs->no_walk = 1;
1237                                continue;
1238                        }
1239                        if (!strcmp(arg, "--do-walk")) {
1240                                revs->no_walk = 0;
1241                                continue;
1242                        }
1243
1244                        opts = diff_opt_parse(&revs->diffopt, argv+i, argc-i);
1245                        if (opts > 0) {
1246                                i += opts - 1;
1247                                continue;
1248                        }
1249                        *unrecognized++ = arg;
1250                        left++;
1251                        continue;
1252                }
1253
1254                if (handle_revision_arg(arg, revs, flags, seen_dashdash)) {
1255                        int j;
1256                        if (seen_dashdash || *arg == '^')
1257                                die("bad revision '%s'", arg);
1258
1259                        /* If we didn't have a "--":
1260                         * (1) all filenames must exist;
1261                         * (2) all rev-args must not be interpretable
1262                         *     as a valid filename.
1263                         * but the latter we have checked in the main loop.
1264                         */
1265                        for (j = i; j < argc; j++)
1266                                verify_filename(revs->prefix, argv[j]);
1267
1268                        revs->prune_data = get_pathspec(revs->prefix,
1269                                                        argv + i);
1270                        break;
1271                }
1272        }
1273
1274        if (revs->grep_filter)
1275                revs->grep_filter->regflags |= regflags;
1276
1277        if (show_merge)
1278                prepare_show_merge(revs);
1279        if (def && !revs->pending.nr) {
1280                unsigned char sha1[20];
1281                struct object *object;
1282                unsigned mode;
1283                if (get_sha1_with_mode(def, sha1, &mode))
1284                        die("bad default revision '%s'", def);
1285                object = get_reference(revs, def, sha1, 0);
1286                add_pending_object_with_mode(revs, object, def, mode);
1287        }
1288
1289        /* Did the user ask for any diff output? Run the diff! */
1290        if (revs->diffopt.output_format & ~DIFF_FORMAT_NO_OUTPUT)
1291                revs->diff = 1;
1292
1293        /* Pickaxe, diff-filter and rename following need diffs */
1294        if (revs->diffopt.pickaxe ||
1295            revs->diffopt.filter ||
1296            DIFF_OPT_TST(&revs->diffopt, FOLLOW_RENAMES))
1297                revs->diff = 1;
1298
1299        if (revs->topo_order)
1300                revs->limited = 1;
1301
1302        if (revs->prune_data) {
1303                diff_tree_setup_paths(revs->prune_data, &revs->pruning);
1304                /* Can't prune commits with rename following: the paths change.. */
1305                if (!DIFF_OPT_TST(&revs->diffopt, FOLLOW_RENAMES))
1306                        revs->prune = 1;
1307                if (!revs->full_diff)
1308                        diff_tree_setup_paths(revs->prune_data, &revs->diffopt);
1309        }
1310        if (revs->combine_merges) {
1311                revs->ignore_merges = 0;
1312                if (revs->dense_combined_merges && !revs->diffopt.output_format)
1313                        revs->diffopt.output_format = DIFF_FORMAT_PATCH;
1314        }
1315        revs->diffopt.abbrev = revs->abbrev;
1316        if (diff_setup_done(&revs->diffopt) < 0)
1317                die("diff_setup_done failed");
1318
1319        if (revs->grep_filter) {
1320                revs->grep_filter->all_match = all_match;
1321                compile_grep_patterns(revs->grep_filter);
1322        }
1323
1324        if (revs->reverse && revs->reflog_info)
1325                die("cannot combine --reverse with --walk-reflogs");
1326
1327        return left;
1328}
1329
1330int prepare_revision_walk(struct rev_info *revs)
1331{
1332        int nr = revs->pending.nr;
1333        struct object_array_entry *e, *list;
1334
1335        e = list = revs->pending.objects;
1336        revs->pending.nr = 0;
1337        revs->pending.alloc = 0;
1338        revs->pending.objects = NULL;
1339        while (--nr >= 0) {
1340                struct commit *commit = handle_commit(revs, e->item, e->name);
1341                if (commit) {
1342                        if (!(commit->object.flags & SEEN)) {
1343                                commit->object.flags |= SEEN;
1344                                insert_by_date(commit, &revs->commits);
1345                        }
1346                }
1347                e++;
1348        }
1349        free(list);
1350
1351        if (revs->no_walk)
1352                return 0;
1353        if (revs->limited)
1354                if (limit_list(revs) < 0)
1355                        return -1;
1356        if (revs->topo_order)
1357                sort_in_topological_order(&revs->commits, revs->lifo);
1358        return 0;
1359}
1360
1361enum rewrite_result {
1362        rewrite_one_ok,
1363        rewrite_one_noparents,
1364        rewrite_one_error,
1365};
1366
1367static enum rewrite_result rewrite_one(struct rev_info *revs, struct commit **pp)
1368{
1369        for (;;) {
1370                struct commit *p = *pp;
1371                if (!revs->limited)
1372                        if (add_parents_to_list(revs, p, &revs->commits) < 0)
1373                                return rewrite_one_error;
1374                if (p->parents && p->parents->next)
1375                        return rewrite_one_ok;
1376                if (p->object.flags & UNINTERESTING)
1377                        return rewrite_one_ok;
1378                if (!(p->object.flags & TREESAME))
1379                        return rewrite_one_ok;
1380                if (!p->parents)
1381                        return rewrite_one_noparents;
1382                *pp = p->parents->item;
1383        }
1384}
1385
1386static void remove_duplicate_parents(struct commit *commit)
1387{
1388        struct commit_list **pp, *p;
1389
1390        /* Examine existing parents while marking ones we have seen... */
1391        pp = &commit->parents;
1392        while ((p = *pp) != NULL) {
1393                struct commit *parent = p->item;
1394                if (parent->object.flags & TMP_MARK) {
1395                        *pp = p->next;
1396                        continue;
1397                }
1398                parent->object.flags |= TMP_MARK;
1399                pp = &p->next;
1400        }
1401        /* ... and clear the temporary mark */
1402        for (p = commit->parents; p; p = p->next)
1403                p->item->object.flags &= ~TMP_MARK;
1404}
1405
1406static int rewrite_parents(struct rev_info *revs, struct commit *commit)
1407{
1408        struct commit_list **pp = &commit->parents;
1409        while (*pp) {
1410                struct commit_list *parent = *pp;
1411                switch (rewrite_one(revs, &parent->item)) {
1412                case rewrite_one_ok:
1413                        break;
1414                case rewrite_one_noparents:
1415                        *pp = parent->next;
1416                        continue;
1417                case rewrite_one_error:
1418                        return -1;
1419                }
1420                pp = &parent->next;
1421        }
1422        remove_duplicate_parents(commit);
1423        return 0;
1424}
1425
1426static int commit_match(struct commit *commit, struct rev_info *opt)
1427{
1428        if (!opt->grep_filter)
1429                return 1;
1430        return grep_buffer(opt->grep_filter,
1431                           NULL, /* we say nothing, not even filename */
1432                           commit->buffer, strlen(commit->buffer));
1433}
1434
1435enum commit_action simplify_commit(struct rev_info *revs, struct commit *commit)
1436{
1437        if (commit->object.flags & SHOWN)
1438                return commit_ignore;
1439        if (revs->unpacked && has_sha1_pack(commit->object.sha1, revs->ignore_packed))
1440                return commit_ignore;
1441        if (commit->object.flags & UNINTERESTING)
1442                return commit_ignore;
1443        if (revs->min_age != -1 && (commit->date > revs->min_age))
1444                return commit_ignore;
1445        if (revs->no_merges && commit->parents && commit->parents->next)
1446                return commit_ignore;
1447        if (!commit_match(commit, revs))
1448                return commit_ignore;
1449        if (revs->prune && revs->dense) {
1450                /* Commit without changes? */
1451                if (commit->object.flags & TREESAME) {
1452                        /* drop merges unless we want parenthood */
1453                        if (!revs->parents)
1454                                return commit_ignore;
1455                        /* non-merge - always ignore it */
1456                        if (!commit->parents || !commit->parents->next)
1457                                return commit_ignore;
1458                }
1459                if (revs->parents && rewrite_parents(revs, commit) < 0)
1460                        return commit_error;
1461        }
1462        return commit_show;
1463}
1464
1465static struct commit *get_revision_1(struct rev_info *revs)
1466{
1467        if (!revs->commits)
1468                return NULL;
1469
1470        do {
1471                struct commit_list *entry = revs->commits;
1472                struct commit *commit = entry->item;
1473
1474                revs->commits = entry->next;
1475                free(entry);
1476
1477                if (revs->reflog_info)
1478                        fake_reflog_parent(revs->reflog_info, commit);
1479
1480                /*
1481                 * If we haven't done the list limiting, we need to look at
1482                 * the parents here. We also need to do the date-based limiting
1483                 * that we'd otherwise have done in limit_list().
1484                 */
1485                if (!revs->limited) {
1486                        if (revs->max_age != -1 &&
1487                            (commit->date < revs->max_age))
1488                                continue;
1489                        if (add_parents_to_list(revs, commit, &revs->commits) < 0)
1490                                return NULL;
1491                }
1492
1493                switch (simplify_commit(revs, commit)) {
1494                case commit_ignore:
1495                        continue;
1496                case commit_error:
1497                        return NULL;
1498                default:
1499                        return commit;
1500                }
1501        } while (revs->commits);
1502        return NULL;
1503}
1504
1505static void gc_boundary(struct object_array *array)
1506{
1507        unsigned nr = array->nr;
1508        unsigned alloc = array->alloc;
1509        struct object_array_entry *objects = array->objects;
1510
1511        if (alloc <= nr) {
1512                unsigned i, j;
1513                for (i = j = 0; i < nr; i++) {
1514                        if (objects[i].item->flags & SHOWN)
1515                                continue;
1516                        if (i != j)
1517                                objects[j] = objects[i];
1518                        j++;
1519                }
1520                for (i = j; i < nr; i++)
1521                        objects[i].item = NULL;
1522                array->nr = j;
1523        }
1524}
1525
1526struct commit *get_revision(struct rev_info *revs)
1527{
1528        struct commit *c = NULL;
1529        struct commit_list *l;
1530
1531        if (revs->boundary == 2) {
1532                unsigned i;
1533                struct object_array *array = &revs->boundary_commits;
1534                struct object_array_entry *objects = array->objects;
1535                for (i = 0; i < array->nr; i++) {
1536                        c = (struct commit *)(objects[i].item);
1537                        if (!c)
1538                                continue;
1539                        if (!(c->object.flags & CHILD_SHOWN))
1540                                continue;
1541                        if (!(c->object.flags & SHOWN))
1542                                break;
1543                }
1544                if (array->nr <= i)
1545                        return NULL;
1546
1547                c->object.flags |= SHOWN | BOUNDARY;
1548                return c;
1549        }
1550
1551        if (revs->reverse) {
1552                int limit = -1;
1553
1554                if (0 <= revs->max_count) {
1555                        limit = revs->max_count;
1556                        if (0 < revs->skip_count)
1557                                limit += revs->skip_count;
1558                }
1559                l = NULL;
1560                while ((c = get_revision_1(revs))) {
1561                        commit_list_insert(c, &l);
1562                        if ((0 < limit) && !--limit)
1563                                break;
1564                }
1565                revs->commits = l;
1566                revs->reverse = 0;
1567                revs->max_count = -1;
1568                c = NULL;
1569        }
1570
1571        /*
1572         * Now pick up what they want to give us
1573         */
1574        c = get_revision_1(revs);
1575        if (c) {
1576                while (0 < revs->skip_count) {
1577                        revs->skip_count--;
1578                        c = get_revision_1(revs);
1579                        if (!c)
1580                                break;
1581                }
1582        }
1583
1584        /*
1585         * Check the max_count.
1586         */
1587        switch (revs->max_count) {
1588        case -1:
1589                break;
1590        case 0:
1591                c = NULL;
1592                break;
1593        default:
1594                revs->max_count--;
1595        }
1596
1597        if (c)
1598                c->object.flags |= SHOWN;
1599
1600        if (!revs->boundary) {
1601                return c;
1602        }
1603
1604        if (!c) {
1605                /*
1606                 * get_revision_1() runs out the commits, and
1607                 * we are done computing the boundaries.
1608                 * switch to boundary commits output mode.
1609                 */
1610                revs->boundary = 2;
1611                return get_revision(revs);
1612        }
1613
1614        /*
1615         * boundary commits are the commits that are parents of the
1616         * ones we got from get_revision_1() but they themselves are
1617         * not returned from get_revision_1().  Before returning
1618         * 'c', we need to mark its parents that they could be boundaries.
1619         */
1620
1621        for (l = c->parents; l; l = l->next) {
1622                struct object *p;
1623                p = &(l->item->object);
1624                if (p->flags & (CHILD_SHOWN | SHOWN))
1625                        continue;
1626                p->flags |= CHILD_SHOWN;
1627                gc_boundary(&revs->boundary_commits);
1628                add_object_array(p, NULL, &revs->boundary_commits);
1629        }
1630
1631        return c;
1632}