Andrew's git / gitweb.git / builtin-log.c
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builtin-log.con commit builtin-pack-object: cache small deltas (e3dfddb)
   1/*
   2 * Builtin "git log" and related commands (show, whatchanged)
   3 *
   4 * (C) Copyright 2006 Linus Torvalds
   5 *               2006 Junio Hamano
   6 */
   7#include "cache.h"
   8#include "commit.h"
   9#include "diff.h"
  10#include "revision.h"
  11#include "log-tree.h"
  12#include "builtin.h"
  13#include "tag.h"
  14#include "reflog-walk.h"
  15#include "patch-ids.h"
  16#include "refs.h"
  17
  18static int default_show_root = 1;
  19
  20/* this is in builtin-diff.c */
  21void add_head(struct rev_info *revs);
  22
  23static void add_name_decoration(const char *prefix, const char *name, struct object *obj)
  24{
  25        int plen = strlen(prefix);
  26        int nlen = strlen(name);
  27        struct name_decoration *res = xmalloc(sizeof(struct name_decoration) + plen + nlen);
  28        memcpy(res->name, prefix, plen);
  29        memcpy(res->name + plen, name, nlen + 1);
  30        res->next = add_decoration(&name_decoration, obj, res);
  31}
  32
  33static int add_ref_decoration(const char *refname, const unsigned char *sha1, int flags, void *cb_data)
  34{
  35        struct object *obj = parse_object(sha1);
  36        if (!obj)
  37                return 0;
  38        add_name_decoration("", refname, obj);
  39        while (obj->type == OBJ_TAG) {
  40                obj = ((struct tag *)obj)->tagged;
  41                if (!obj)
  42                        break;
  43                add_name_decoration("tag: ", refname, obj);
  44        }
  45        return 0;
  46}
  47
  48static void cmd_log_init(int argc, const char **argv, const char *prefix,
  49                      struct rev_info *rev)
  50{
  51        int i;
  52        int decorate = 0;
  53
  54        rev->abbrev = DEFAULT_ABBREV;
  55        rev->commit_format = CMIT_FMT_DEFAULT;
  56        rev->verbose_header = 1;
  57        rev->show_root_diff = default_show_root;
  58        argc = setup_revisions(argc, argv, rev, "HEAD");
  59        if (rev->diffopt.pickaxe || rev->diffopt.filter)
  60                rev->always_show_header = 0;
  61        for (i = 1; i < argc; i++) {
  62                const char *arg = argv[i];
  63                if (!prefixcmp(arg, "--encoding=")) {
  64                        arg += 11;
  65                        if (strcmp(arg, "none"))
  66                                git_log_output_encoding = xstrdup(arg);
  67                        else
  68                                git_log_output_encoding = "";
  69                } else if (!strcmp(arg, "--decorate")) {
  70                        if (!decorate)
  71                                for_each_ref(add_ref_decoration, NULL);
  72                        decorate = 1;
  73                } else
  74                        die("unrecognized argument: %s", arg);
  75        }
  76}
  77
  78static int cmd_log_walk(struct rev_info *rev)
  79{
  80        struct commit *commit;
  81
  82        prepare_revision_walk(rev);
  83        while ((commit = get_revision(rev)) != NULL) {
  84                log_tree_commit(rev, commit);
  85                if (!rev->reflog_info) {
  86                        /* we allow cycles in reflog ancestry */
  87                        free(commit->buffer);
  88                        commit->buffer = NULL;
  89                }
  90                free_commit_list(commit->parents);
  91                commit->parents = NULL;
  92        }
  93        return 0;
  94}
  95
  96static int git_log_config(const char *var, const char *value)
  97{
  98        if (!strcmp(var, "log.showroot")) {
  99                default_show_root = git_config_bool(var, value);
 100                return 0;
 101        }
 102        return git_diff_ui_config(var, value);
 103}
 104
 105int cmd_whatchanged(int argc, const char **argv, const char *prefix)
 106{
 107        struct rev_info rev;
 108
 109        git_config(git_log_config);
 110        init_revisions(&rev, prefix);
 111        rev.diff = 1;
 112        rev.diffopt.recursive = 1;
 113        rev.simplify_history = 0;
 114        cmd_log_init(argc, argv, prefix, &rev);
 115        if (!rev.diffopt.output_format)
 116                rev.diffopt.output_format = DIFF_FORMAT_RAW;
 117        return cmd_log_walk(&rev);
 118}
 119
 120static int show_object(const unsigned char *sha1, int suppress_header)
 121{
 122        unsigned long size;
 123        enum object_type type;
 124        char *buf = read_sha1_file(sha1, &type, &size);
 125        int offset = 0;
 126
 127        if (!buf)
 128                return error("Could not read object %s", sha1_to_hex(sha1));
 129
 130        if (suppress_header)
 131                while (offset < size && buf[offset++] != '\n') {
 132                        int new_offset = offset;
 133                        while (new_offset < size && buf[new_offset++] != '\n')
 134                                ; /* do nothing */
 135                        offset = new_offset;
 136                }
 137
 138        if (offset < size)
 139                fwrite(buf + offset, size - offset, 1, stdout);
 140        free(buf);
 141        return 0;
 142}
 143
 144static int show_tree_object(const unsigned char *sha1,
 145                const char *base, int baselen,
 146                const char *pathname, unsigned mode, int stage)
 147{
 148        printf("%s%s\n", pathname, S_ISDIR(mode) ? "/" : "");
 149        return 0;
 150}
 151
 152int cmd_show(int argc, const char **argv, const char *prefix)
 153{
 154        struct rev_info rev;
 155        struct object_array_entry *objects;
 156        int i, count, ret = 0;
 157
 158        git_config(git_log_config);
 159        init_revisions(&rev, prefix);
 160        rev.diff = 1;
 161        rev.diffopt.recursive = 1;
 162        rev.combine_merges = 1;
 163        rev.dense_combined_merges = 1;
 164        rev.always_show_header = 1;
 165        rev.ignore_merges = 0;
 166        rev.no_walk = 1;
 167        cmd_log_init(argc, argv, prefix, &rev);
 168
 169        count = rev.pending.nr;
 170        objects = rev.pending.objects;
 171        for (i = 0; i < count && !ret; i++) {
 172                struct object *o = objects[i].item;
 173                const char *name = objects[i].name;
 174                switch (o->type) {
 175                case OBJ_BLOB:
 176                        ret = show_object(o->sha1, 0);
 177                        break;
 178                case OBJ_TAG: {
 179                        struct tag *t = (struct tag *)o;
 180
 181                        printf("%stag %s%s\n\n",
 182                                        diff_get_color(rev.diffopt.color_diff,
 183                                                DIFF_COMMIT),
 184                                        t->tag,
 185                                        diff_get_color(rev.diffopt.color_diff,
 186                                                DIFF_RESET));
 187                        ret = show_object(o->sha1, 1);
 188                        objects[i].item = (struct object *)t->tagged;
 189                        i--;
 190                        break;
 191                }
 192                case OBJ_TREE:
 193                        printf("%stree %s%s\n\n",
 194                                        diff_get_color(rev.diffopt.color_diff,
 195                                                DIFF_COMMIT),
 196                                        name,
 197                                        diff_get_color(rev.diffopt.color_diff,
 198                                                DIFF_RESET));
 199                        read_tree_recursive((struct tree *)o, "", 0, 0, NULL,
 200                                        show_tree_object);
 201                        break;
 202                case OBJ_COMMIT:
 203                        rev.pending.nr = rev.pending.alloc = 0;
 204                        rev.pending.objects = NULL;
 205                        add_object_array(o, name, &rev.pending);
 206                        ret = cmd_log_walk(&rev);
 207                        break;
 208                default:
 209                        ret = error("Unknown type: %d", o->type);
 210                }
 211        }
 212        free(objects);
 213        return ret;
 214}
 215
 216/*
 217 * This is equivalent to "git log -g --abbrev-commit --pretty=oneline"
 218 */
 219int cmd_log_reflog(int argc, const char **argv, const char *prefix)
 220{
 221        struct rev_info rev;
 222
 223        git_config(git_log_config);
 224        init_revisions(&rev, prefix);
 225        init_reflog_walk(&rev.reflog_info);
 226        rev.abbrev_commit = 1;
 227        rev.verbose_header = 1;
 228        cmd_log_init(argc, argv, prefix, &rev);
 229
 230        /*
 231         * This means that we override whatever commit format the user gave
 232         * on the cmd line.  Sad, but cmd_log_init() currently doesn't
 233         * allow us to set a different default.
 234         */
 235        rev.commit_format = CMIT_FMT_ONELINE;
 236        rev.always_show_header = 1;
 237
 238        /*
 239         * We get called through "git reflog", so unlike the other log
 240         * routines, we need to set up our pager manually..
 241         */
 242        setup_pager();
 243
 244        return cmd_log_walk(&rev);
 245}
 246
 247int cmd_log(int argc, const char **argv, const char *prefix)
 248{
 249        struct rev_info rev;
 250
 251        git_config(git_log_config);
 252        init_revisions(&rev, prefix);
 253        rev.always_show_header = 1;
 254        cmd_log_init(argc, argv, prefix, &rev);
 255        return cmd_log_walk(&rev);
 256}
 257
 258/* format-patch */
 259#define FORMAT_PATCH_NAME_MAX 64
 260
 261static int istitlechar(char c)
 262{
 263        return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') ||
 264                (c >= '0' && c <= '9') || c == '.' || c == '_';
 265}
 266
 267static char *extra_headers = NULL;
 268static int extra_headers_size = 0;
 269static const char *fmt_patch_suffix = ".patch";
 270
 271static int git_format_config(const char *var, const char *value)
 272{
 273        if (!strcmp(var, "format.headers")) {
 274                int len;
 275
 276                if (!value)
 277                        die("format.headers without value");
 278                len = strlen(value);
 279                extra_headers_size += len + 1;
 280                extra_headers = xrealloc(extra_headers, extra_headers_size);
 281                extra_headers[extra_headers_size - len - 1] = 0;
 282                strcat(extra_headers, value);
 283                return 0;
 284        }
 285        if (!strcmp(var, "format.suffix")) {
 286                if (!value)
 287                        die("format.suffix without value");
 288                fmt_patch_suffix = xstrdup(value);
 289                return 0;
 290        }
 291        if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
 292                return 0;
 293        }
 294        return git_log_config(var, value);
 295}
 296
 297
 298static FILE *realstdout = NULL;
 299static const char *output_directory = NULL;
 300
 301static int reopen_stdout(struct commit *commit, int nr, int keep_subject)
 302{
 303        char filename[PATH_MAX];
 304        char *sol;
 305        int len = 0;
 306        int suffix_len = strlen(fmt_patch_suffix) + 1;
 307
 308        if (output_directory) {
 309                if (strlen(output_directory) >=
 310                    sizeof(filename) - FORMAT_PATCH_NAME_MAX - suffix_len)
 311                        return error("name of output directory is too long");
 312                strlcpy(filename, output_directory, sizeof(filename) - suffix_len);
 313                len = strlen(filename);
 314                if (filename[len - 1] != '/')
 315                        filename[len++] = '/';
 316        }
 317
 318        sprintf(filename + len, "%04d", nr);
 319        len = strlen(filename);
 320
 321        sol = strstr(commit->buffer, "\n\n");
 322        if (sol) {
 323                int j, space = 1;
 324
 325                sol += 2;
 326                /* strip [PATCH] or [PATCH blabla] */
 327                if (!keep_subject && !prefixcmp(sol, "[PATCH")) {
 328                        char *eos = strchr(sol + 6, ']');
 329                        if (eos) {
 330                                while (isspace(*eos))
 331                                        eos++;
 332                                sol = eos;
 333                        }
 334                }
 335
 336                for (j = 0;
 337                     j < FORMAT_PATCH_NAME_MAX - suffix_len - 5 &&
 338                             len < sizeof(filename) - suffix_len &&
 339                             sol[j] && sol[j] != '\n';
 340                     j++) {
 341                        if (istitlechar(sol[j])) {
 342                                if (space) {
 343                                        filename[len++] = '-';
 344                                        space = 0;
 345                                }
 346                                filename[len++] = sol[j];
 347                                if (sol[j] == '.')
 348                                        while (sol[j + 1] == '.')
 349                                                j++;
 350                        } else
 351                                space = 1;
 352                }
 353                while (filename[len - 1] == '.' || filename[len - 1] == '-')
 354                        len--;
 355                filename[len] = 0;
 356        }
 357        if (len + suffix_len >= sizeof(filename))
 358                return error("Patch pathname too long");
 359        strcpy(filename + len, fmt_patch_suffix);
 360        fprintf(realstdout, "%s\n", filename);
 361        if (freopen(filename, "w", stdout) == NULL)
 362                return error("Cannot open patch file %s",filename);
 363        return 0;
 364
 365}
 366
 367static void get_patch_ids(struct rev_info *rev, struct patch_ids *ids, const char *prefix)
 368{
 369        struct rev_info check_rev;
 370        struct commit *commit;
 371        struct object *o1, *o2;
 372        unsigned flags1, flags2;
 373
 374        if (rev->pending.nr != 2)
 375                die("Need exactly one range.");
 376
 377        o1 = rev->pending.objects[0].item;
 378        flags1 = o1->flags;
 379        o2 = rev->pending.objects[1].item;
 380        flags2 = o2->flags;
 381
 382        if ((flags1 & UNINTERESTING) == (flags2 & UNINTERESTING))
 383                die("Not a range.");
 384
 385        init_patch_ids(ids);
 386
 387        /* given a range a..b get all patch ids for b..a */
 388        init_revisions(&check_rev, prefix);
 389        o1->flags ^= UNINTERESTING;
 390        o2->flags ^= UNINTERESTING;
 391        add_pending_object(&check_rev, o1, "o1");
 392        add_pending_object(&check_rev, o2, "o2");
 393        prepare_revision_walk(&check_rev);
 394
 395        while ((commit = get_revision(&check_rev)) != NULL) {
 396                /* ignore merges */
 397                if (commit->parents && commit->parents->next)
 398                        continue;
 399
 400                add_commit_patch_id(commit, ids);
 401        }
 402
 403        /* reset for next revision walk */
 404        clear_commit_marks((struct commit *)o1,
 405                        SEEN | UNINTERESTING | SHOWN | ADDED);
 406        clear_commit_marks((struct commit *)o2,
 407                        SEEN | UNINTERESTING | SHOWN | ADDED);
 408        o1->flags = flags1;
 409        o2->flags = flags2;
 410}
 411
 412static void gen_message_id(char *dest, unsigned int length, char *base)
 413{
 414        const char *committer = git_committer_info(-1);
 415        const char *email_start = strrchr(committer, '<');
 416        const char *email_end = strrchr(committer, '>');
 417        if(!email_start || !email_end || email_start > email_end - 1)
 418                die("Could not extract email from committer identity.");
 419        snprintf(dest, length, "%s.%lu.git.%.*s", base,
 420                 (unsigned long) time(NULL),
 421                 (int)(email_end - email_start - 1), email_start + 1);
 422}
 423
 424int cmd_format_patch(int argc, const char **argv, const char *prefix)
 425{
 426        struct commit *commit;
 427        struct commit **list = NULL;
 428        struct rev_info rev;
 429        int nr = 0, total, i, j;
 430        int use_stdout = 0;
 431        int numbered = 0;
 432        int start_number = -1;
 433        int keep_subject = 0;
 434        int subject_prefix = 0;
 435        int ignore_if_in_upstream = 0;
 436        int thread = 0;
 437        const char *in_reply_to = NULL;
 438        struct patch_ids ids;
 439        char *add_signoff = NULL;
 440        char message_id[1024];
 441        char ref_message_id[1024];
 442
 443        git_config(git_format_config);
 444        init_revisions(&rev, prefix);
 445        rev.commit_format = CMIT_FMT_EMAIL;
 446        rev.verbose_header = 1;
 447        rev.diff = 1;
 448        rev.combine_merges = 0;
 449        rev.ignore_merges = 1;
 450        rev.diffopt.msg_sep = "";
 451        rev.diffopt.recursive = 1;
 452
 453        rev.extra_headers = extra_headers;
 454
 455        /*
 456         * Parse the arguments before setup_revisions(), or something
 457         * like "git format-patch -o a123 HEAD^.." may fail; a123 is
 458         * possibly a valid SHA1.
 459         */
 460        for (i = 1, j = 1; i < argc; i++) {
 461                if (!strcmp(argv[i], "--stdout"))
 462                        use_stdout = 1;
 463                else if (!strcmp(argv[i], "-n") ||
 464                                !strcmp(argv[i], "--numbered"))
 465                        numbered = 1;
 466                else if (!prefixcmp(argv[i], "--start-number="))
 467                        start_number = strtol(argv[i] + 15, NULL, 10);
 468                else if (!strcmp(argv[i], "--start-number")) {
 469                        i++;
 470                        if (i == argc)
 471                                die("Need a number for --start-number");
 472                        start_number = strtol(argv[i], NULL, 10);
 473                }
 474                else if (!strcmp(argv[i], "-k") ||
 475                                !strcmp(argv[i], "--keep-subject")) {
 476                        keep_subject = 1;
 477                        rev.total = -1;
 478                }
 479                else if (!strcmp(argv[i], "--output-directory") ||
 480                         !strcmp(argv[i], "-o")) {
 481                        i++;
 482                        if (argc <= i)
 483                                die("Which directory?");
 484                        if (output_directory)
 485                                die("Two output directories?");
 486                        output_directory = argv[i];
 487                }
 488                else if (!strcmp(argv[i], "--signoff") ||
 489                         !strcmp(argv[i], "-s")) {
 490                        const char *committer;
 491                        const char *endpos;
 492                        committer = git_committer_info(1);
 493                        endpos = strchr(committer, '>');
 494                        if (!endpos)
 495                                die("bogos committer info %s\n", committer);
 496                        add_signoff = xmalloc(endpos - committer + 2);
 497                        memcpy(add_signoff, committer, endpos - committer + 1);
 498                        add_signoff[endpos - committer + 1] = 0;
 499                }
 500                else if (!strcmp(argv[i], "--attach")) {
 501                        rev.mime_boundary = git_version_string;
 502                        rev.no_inline = 1;
 503                }
 504                else if (!prefixcmp(argv[i], "--attach=")) {
 505                        rev.mime_boundary = argv[i] + 9;
 506                        rev.no_inline = 1;
 507                }
 508                else if (!strcmp(argv[i], "--inline")) {
 509                        rev.mime_boundary = git_version_string;
 510                        rev.no_inline = 0;
 511                }
 512                else if (!prefixcmp(argv[i], "--inline=")) {
 513                        rev.mime_boundary = argv[i] + 9;
 514                        rev.no_inline = 0;
 515                }
 516                else if (!strcmp(argv[i], "--ignore-if-in-upstream"))
 517                        ignore_if_in_upstream = 1;
 518                else if (!strcmp(argv[i], "--thread"))
 519                        thread = 1;
 520                else if (!prefixcmp(argv[i], "--in-reply-to="))
 521                        in_reply_to = argv[i] + 14;
 522                else if (!strcmp(argv[i], "--in-reply-to")) {
 523                        i++;
 524                        if (i == argc)
 525                                die("Need a Message-Id for --in-reply-to");
 526                        in_reply_to = argv[i];
 527                } else if (!prefixcmp(argv[i], "--subject-prefix=")) {
 528                        subject_prefix = 1;
 529                        rev.subject_prefix = argv[i] + 17;
 530                } else if (!prefixcmp(argv[i], "--suffix="))
 531                        fmt_patch_suffix = argv[i] + 9;
 532                else
 533                        argv[j++] = argv[i];
 534        }
 535        argc = j;
 536
 537        if (start_number < 0)
 538                start_number = 1;
 539        if (numbered && keep_subject)
 540                die ("-n and -k are mutually exclusive.");
 541        if (keep_subject && subject_prefix)
 542                die ("--subject-prefix and -k are mutually exclusive.");
 543
 544        argc = setup_revisions(argc, argv, &rev, "HEAD");
 545        if (argc > 1)
 546                die ("unrecognized argument: %s", argv[1]);
 547
 548        if (!rev.diffopt.output_format)
 549                rev.diffopt.output_format = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_SUMMARY | DIFF_FORMAT_PATCH;
 550
 551        if (!rev.diffopt.text)
 552                rev.diffopt.binary = 1;
 553
 554        if (!output_directory && !use_stdout)
 555                output_directory = prefix;
 556
 557        if (output_directory) {
 558                if (use_stdout)
 559                        die("standard output, or directory, which one?");
 560                if (mkdir(output_directory, 0777) < 0 && errno != EEXIST)
 561                        die("Could not create directory %s",
 562                            output_directory);
 563        }
 564
 565        if (rev.pending.nr == 1) {
 566                if (rev.max_count < 0) {
 567                        rev.pending.objects[0].item->flags |= UNINTERESTING;
 568                        add_head(&rev);
 569                }
 570                /* Otherwise, it is "format-patch -22 HEAD", and
 571                 * get_revision() would return only the specified count.
 572                 */
 573        }
 574
 575        if (ignore_if_in_upstream)
 576                get_patch_ids(&rev, &ids, prefix);
 577
 578        if (!use_stdout)
 579                realstdout = fdopen(dup(1), "w");
 580
 581        prepare_revision_walk(&rev);
 582        while ((commit = get_revision(&rev)) != NULL) {
 583                /* ignore merges */
 584                if (commit->parents && commit->parents->next)
 585                        continue;
 586
 587                if (ignore_if_in_upstream &&
 588                                has_commit_patch_id(commit, &ids))
 589                        continue;
 590
 591                nr++;
 592                list = xrealloc(list, nr * sizeof(list[0]));
 593                list[nr - 1] = commit;
 594        }
 595        total = nr;
 596        if (numbered)
 597                rev.total = total + start_number - 1;
 598        rev.add_signoff = add_signoff;
 599        rev.ref_message_id = in_reply_to;
 600        while (0 <= --nr) {
 601                int shown;
 602                commit = list[nr];
 603                rev.nr = total - nr + (start_number - 1);
 604                /* Make the second and subsequent mails replies to the first */
 605                if (thread) {
 606                        if (nr == (total - 2)) {
 607                                strncpy(ref_message_id, message_id,
 608                                        sizeof(ref_message_id));
 609                                ref_message_id[sizeof(ref_message_id)-1]='\0';
 610                                rev.ref_message_id = ref_message_id;
 611                        }
 612                        gen_message_id(message_id, sizeof(message_id),
 613                                       sha1_to_hex(commit->object.sha1));
 614                        rev.message_id = message_id;
 615                }
 616                if (!use_stdout)
 617                        if (reopen_stdout(commit, rev.nr, keep_subject))
 618                                die("Failed to create output files");
 619                shown = log_tree_commit(&rev, commit);
 620                free(commit->buffer);
 621                commit->buffer = NULL;
 622
 623                /* We put one extra blank line between formatted
 624                 * patches and this flag is used by log-tree code
 625                 * to see if it needs to emit a LF before showing
 626                 * the log; when using one file per patch, we do
 627                 * not want the extra blank line.
 628                 */
 629                if (!use_stdout)
 630                        rev.shown_one = 0;
 631                if (shown) {
 632                        if (rev.mime_boundary)
 633                                printf("\n--%s%s--\n\n\n",
 634                                       mime_boundary_leader,
 635                                       rev.mime_boundary);
 636                        else
 637                                printf("-- \n%s\n\n", git_version_string);
 638                }
 639                if (!use_stdout)
 640                        fclose(stdout);
 641        }
 642        free(list);
 643        if (ignore_if_in_upstream)
 644                free_patch_ids(&ids);
 645        return 0;
 646}
 647
 648static int add_pending_commit(const char *arg, struct rev_info *revs, int flags)
 649{
 650        unsigned char sha1[20];
 651        if (get_sha1(arg, sha1) == 0) {
 652                struct commit *commit = lookup_commit_reference(sha1);
 653                if (commit) {
 654                        commit->object.flags |= flags;
 655                        add_pending_object(revs, &commit->object, arg);
 656                        return 0;
 657                }
 658        }
 659        return -1;
 660}
 661
 662static const char cherry_usage[] =
 663"git-cherry [-v] <upstream> [<head>] [<limit>]";
 664int cmd_cherry(int argc, const char **argv, const char *prefix)
 665{
 666        struct rev_info revs;
 667        struct patch_ids ids;
 668        struct commit *commit;
 669        struct commit_list *list = NULL;
 670        const char *upstream;
 671        const char *head = "HEAD";
 672        const char *limit = NULL;
 673        int verbose = 0;
 674
 675        if (argc > 1 && !strcmp(argv[1], "-v")) {
 676                verbose = 1;
 677                argc--;
 678                argv++;
 679        }
 680
 681        switch (argc) {
 682        case 4:
 683                limit = argv[3];
 684                /* FALLTHROUGH */
 685        case 3:
 686                head = argv[2];
 687                /* FALLTHROUGH */
 688        case 2:
 689                upstream = argv[1];
 690                break;
 691        default:
 692                usage(cherry_usage);
 693        }
 694
 695        init_revisions(&revs, prefix);
 696        revs.diff = 1;
 697        revs.combine_merges = 0;
 698        revs.ignore_merges = 1;
 699        revs.diffopt.recursive = 1;
 700
 701        if (add_pending_commit(head, &revs, 0))
 702                die("Unknown commit %s", head);
 703        if (add_pending_commit(upstream, &revs, UNINTERESTING))
 704                die("Unknown commit %s", upstream);
 705
 706        /* Don't say anything if head and upstream are the same. */
 707        if (revs.pending.nr == 2) {
 708                struct object_array_entry *o = revs.pending.objects;
 709                if (hashcmp(o[0].item->sha1, o[1].item->sha1) == 0)
 710                        return 0;
 711        }
 712
 713        get_patch_ids(&revs, &ids, prefix);
 714
 715        if (limit && add_pending_commit(limit, &revs, UNINTERESTING))
 716                die("Unknown commit %s", limit);
 717
 718        /* reverse the list of commits */
 719        prepare_revision_walk(&revs);
 720        while ((commit = get_revision(&revs)) != NULL) {
 721                /* ignore merges */
 722                if (commit->parents && commit->parents->next)
 723                        continue;
 724
 725                commit_list_insert(commit, &list);
 726        }
 727
 728        while (list) {
 729                char sign = '+';
 730
 731                commit = list->item;
 732                if (has_commit_patch_id(commit, &ids))
 733                        sign = '-';
 734
 735                if (verbose) {
 736                        static char buf[16384];
 737                        pretty_print_commit(CMIT_FMT_ONELINE, commit, ~0,
 738                                            buf, sizeof(buf), 0, NULL, NULL, 0);
 739                        printf("%c %s %s\n", sign,
 740                               sha1_to_hex(commit->object.sha1), buf);
 741                }
 742                else {
 743                        printf("%c %s\n", sign,
 744                               sha1_to_hex(commit->object.sha1));
 745                }
 746
 747                list = list->next;
 748        }
 749
 750        free_patch_ids(&ids);
 751        return 0;
 752}