Andrew's git / gitweb.git / builtin-log.c
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builtin-log.con commit Alter git-checkout reflog message to include "from" branch (49aba0b)
   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;
  19static const char *fmt_patch_subject_prefix = "PATCH";
  20
  21/* this is in builtin-diff.c */
  22void add_head(struct rev_info *revs);
  23
  24static void add_name_decoration(const char *prefix, const char *name, struct object *obj)
  25{
  26        int plen = strlen(prefix);
  27        int nlen = strlen(name);
  28        struct name_decoration *res = xmalloc(sizeof(struct name_decoration) + plen + nlen);
  29        memcpy(res->name, prefix, plen);
  30        memcpy(res->name + plen, name, nlen + 1);
  31        res->next = add_decoration(&name_decoration, obj, res);
  32}
  33
  34static int add_ref_decoration(const char *refname, const unsigned char *sha1, int flags, void *cb_data)
  35{
  36        struct object *obj = parse_object(sha1);
  37        if (!obj)
  38                return 0;
  39        add_name_decoration("", refname, obj);
  40        while (obj->type == OBJ_TAG) {
  41                obj = ((struct tag *)obj)->tagged;
  42                if (!obj)
  43                        break;
  44                add_name_decoration("tag: ", refname, obj);
  45        }
  46        return 0;
  47}
  48
  49static void cmd_log_init(int argc, const char **argv, const char *prefix,
  50                      struct rev_info *rev)
  51{
  52        int i;
  53        int decorate = 0;
  54
  55        rev->abbrev = DEFAULT_ABBREV;
  56        rev->commit_format = CMIT_FMT_DEFAULT;
  57        rev->verbose_header = 1;
  58        rev->show_root_diff = default_show_root;
  59        rev->subject_prefix = fmt_patch_subject_prefix;
  60        argc = setup_revisions(argc, argv, rev, "HEAD");
  61        if (rev->diffopt.pickaxe || rev->diffopt.filter)
  62                rev->always_show_header = 0;
  63        if (rev->diffopt.follow_renames) {
  64                rev->always_show_header = 0;
  65                if (rev->diffopt.nr_paths != 1)
  66                        usage("git logs can only follow renames on one pathname at a time");
  67        }
  68        for (i = 1; i < argc; i++) {
  69                const char *arg = argv[i];
  70                if (!strcmp(arg, "--decorate")) {
  71                        if (!decorate)
  72                                for_each_ref(add_ref_decoration, NULL);
  73                        decorate = 1;
  74                } else
  75                        die("unrecognized argument: %s", arg);
  76        }
  77}
  78
  79static int cmd_log_walk(struct rev_info *rev)
  80{
  81        struct commit *commit;
  82
  83        prepare_revision_walk(rev);
  84        while ((commit = get_revision(rev)) != NULL) {
  85                log_tree_commit(rev, commit);
  86                if (!rev->reflog_info) {
  87                        /* we allow cycles in reflog ancestry */
  88                        free(commit->buffer);
  89                        commit->buffer = NULL;
  90                }
  91                free_commit_list(commit->parents);
  92                commit->parents = NULL;
  93        }
  94        return 0;
  95}
  96
  97static int git_log_config(const char *var, const char *value)
  98{
  99        if (!strcmp(var, "format.subjectprefix")) {
 100                if (!value)
 101                        die("format.subjectprefix without value");
 102                fmt_patch_subject_prefix = xstrdup(value);
 103                return 0;
 104        }
 105        if (!strcmp(var, "log.showroot")) {
 106                default_show_root = git_config_bool(var, value);
 107                return 0;
 108        }
 109        return git_diff_ui_config(var, value);
 110}
 111
 112int cmd_whatchanged(int argc, const char **argv, const char *prefix)
 113{
 114        struct rev_info rev;
 115
 116        git_config(git_log_config);
 117        init_revisions(&rev, prefix);
 118        rev.diff = 1;
 119        rev.diffopt.recursive = 1;
 120        rev.simplify_history = 0;
 121        cmd_log_init(argc, argv, prefix, &rev);
 122        if (!rev.diffopt.output_format)
 123                rev.diffopt.output_format = DIFF_FORMAT_RAW;
 124        return cmd_log_walk(&rev);
 125}
 126
 127static int show_object(const unsigned char *sha1, int suppress_header)
 128{
 129        unsigned long size;
 130        enum object_type type;
 131        char *buf = read_sha1_file(sha1, &type, &size);
 132        int offset = 0;
 133
 134        if (!buf)
 135                return error("Could not read object %s", sha1_to_hex(sha1));
 136
 137        if (suppress_header)
 138                while (offset < size && buf[offset++] != '\n') {
 139                        int new_offset = offset;
 140                        while (new_offset < size && buf[new_offset++] != '\n')
 141                                ; /* do nothing */
 142                        offset = new_offset;
 143                }
 144
 145        if (offset < size)
 146                fwrite(buf + offset, size - offset, 1, stdout);
 147        free(buf);
 148        return 0;
 149}
 150
 151static int show_tree_object(const unsigned char *sha1,
 152                const char *base, int baselen,
 153                const char *pathname, unsigned mode, int stage)
 154{
 155        printf("%s%s\n", pathname, S_ISDIR(mode) ? "/" : "");
 156        return 0;
 157}
 158
 159int cmd_show(int argc, const char **argv, const char *prefix)
 160{
 161        struct rev_info rev;
 162        struct object_array_entry *objects;
 163        int i, count, ret = 0;
 164
 165        git_config(git_log_config);
 166        init_revisions(&rev, prefix);
 167        rev.diff = 1;
 168        rev.diffopt.recursive = 1;
 169        rev.combine_merges = 1;
 170        rev.dense_combined_merges = 1;
 171        rev.always_show_header = 1;
 172        rev.ignore_merges = 0;
 173        rev.no_walk = 1;
 174        cmd_log_init(argc, argv, prefix, &rev);
 175
 176        count = rev.pending.nr;
 177        objects = rev.pending.objects;
 178        for (i = 0; i < count && !ret; i++) {
 179                struct object *o = objects[i].item;
 180                const char *name = objects[i].name;
 181                switch (o->type) {
 182                case OBJ_BLOB:
 183                        ret = show_object(o->sha1, 0);
 184                        break;
 185                case OBJ_TAG: {
 186                        struct tag *t = (struct tag *)o;
 187
 188                        printf("%stag %s%s\n\n",
 189                                        diff_get_color(rev.diffopt.color_diff,
 190                                                DIFF_COMMIT),
 191                                        t->tag,
 192                                        diff_get_color(rev.diffopt.color_diff,
 193                                                DIFF_RESET));
 194                        ret = show_object(o->sha1, 1);
 195                        objects[i].item = (struct object *)t->tagged;
 196                        i--;
 197                        break;
 198                }
 199                case OBJ_TREE:
 200                        printf("%stree %s%s\n\n",
 201                                        diff_get_color(rev.diffopt.color_diff,
 202                                                DIFF_COMMIT),
 203                                        name,
 204                                        diff_get_color(rev.diffopt.color_diff,
 205                                                DIFF_RESET));
 206                        read_tree_recursive((struct tree *)o, "", 0, 0, NULL,
 207                                        show_tree_object);
 208                        break;
 209                case OBJ_COMMIT:
 210                        rev.pending.nr = rev.pending.alloc = 0;
 211                        rev.pending.objects = NULL;
 212                        add_object_array(o, name, &rev.pending);
 213                        ret = cmd_log_walk(&rev);
 214                        break;
 215                default:
 216                        ret = error("Unknown type: %d", o->type);
 217                }
 218        }
 219        free(objects);
 220        return ret;
 221}
 222
 223/*
 224 * This is equivalent to "git log -g --abbrev-commit --pretty=oneline"
 225 */
 226int cmd_log_reflog(int argc, const char **argv, const char *prefix)
 227{
 228        struct rev_info rev;
 229
 230        git_config(git_log_config);
 231        init_revisions(&rev, prefix);
 232        init_reflog_walk(&rev.reflog_info);
 233        rev.abbrev_commit = 1;
 234        rev.verbose_header = 1;
 235        cmd_log_init(argc, argv, prefix, &rev);
 236
 237        /*
 238         * This means that we override whatever commit format the user gave
 239         * on the cmd line.  Sad, but cmd_log_init() currently doesn't
 240         * allow us to set a different default.
 241         */
 242        rev.commit_format = CMIT_FMT_ONELINE;
 243        rev.always_show_header = 1;
 244
 245        /*
 246         * We get called through "git reflog", so unlike the other log
 247         * routines, we need to set up our pager manually..
 248         */
 249        setup_pager();
 250
 251        return cmd_log_walk(&rev);
 252}
 253
 254int cmd_log(int argc, const char **argv, const char *prefix)
 255{
 256        struct rev_info rev;
 257
 258        git_config(git_log_config);
 259        init_revisions(&rev, prefix);
 260        rev.always_show_header = 1;
 261        cmd_log_init(argc, argv, prefix, &rev);
 262        return cmd_log_walk(&rev);
 263}
 264
 265/* format-patch */
 266#define FORMAT_PATCH_NAME_MAX 64
 267
 268static int istitlechar(char c)
 269{
 270        return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') ||
 271                (c >= '0' && c <= '9') || c == '.' || c == '_';
 272}
 273
 274static char *extra_headers = NULL;
 275static int extra_headers_size = 0;
 276static const char *fmt_patch_suffix = ".patch";
 277
 278static int git_format_config(const char *var, const char *value)
 279{
 280        if (!strcmp(var, "format.headers")) {
 281                int len;
 282
 283                if (!value)
 284                        die("format.headers without value");
 285                len = strlen(value);
 286                extra_headers_size += len + 1;
 287                extra_headers = xrealloc(extra_headers, extra_headers_size);
 288                extra_headers[extra_headers_size - len - 1] = 0;
 289                strcat(extra_headers, value);
 290                return 0;
 291        }
 292        if (!strcmp(var, "format.suffix")) {
 293                if (!value)
 294                        die("format.suffix without value");
 295                fmt_patch_suffix = xstrdup(value);
 296                return 0;
 297        }
 298        if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
 299                return 0;
 300        }
 301
 302        return git_log_config(var, value);
 303}
 304
 305
 306static FILE *realstdout = NULL;
 307static const char *output_directory = NULL;
 308
 309static int reopen_stdout(struct commit *commit, int nr, int keep_subject,
 310                         int numbered_files)
 311{
 312        char filename[PATH_MAX];
 313        char *sol;
 314        int len = 0;
 315        int suffix_len = strlen(fmt_patch_suffix) + 1;
 316
 317        if (output_directory) {
 318                if (strlen(output_directory) >=
 319                    sizeof(filename) - FORMAT_PATCH_NAME_MAX - suffix_len)
 320                        return error("name of output directory is too long");
 321                strlcpy(filename, output_directory, sizeof(filename) - suffix_len);
 322                len = strlen(filename);
 323                if (filename[len - 1] != '/')
 324                        filename[len++] = '/';
 325        }
 326
 327        if (numbered_files) {
 328                sprintf(filename + len, "%d", nr);
 329                len = strlen(filename);
 330
 331        } else {
 332                sprintf(filename + len, "%04d", nr);
 333                len = strlen(filename);
 334
 335                sol = strstr(commit->buffer, "\n\n");
 336                if (sol) {
 337                        int j, space = 1;
 338
 339                        sol += 2;
 340                        /* strip [PATCH] or [PATCH blabla] */
 341                        if (!keep_subject && !prefixcmp(sol, "[PATCH")) {
 342                                char *eos = strchr(sol + 6, ']');
 343                                if (eos) {
 344                                        while (isspace(*eos))
 345                                                eos++;
 346                                        sol = eos;
 347                                }
 348                        }
 349
 350                        for (j = 0;
 351                             j < FORMAT_PATCH_NAME_MAX - suffix_len - 5 &&
 352                                     len < sizeof(filename) - suffix_len &&
 353                                     sol[j] && sol[j] != '\n';
 354                             j++) {
 355                                if (istitlechar(sol[j])) {
 356                                        if (space) {
 357                                                filename[len++] = '-';
 358                                                space = 0;
 359                                        }
 360                                        filename[len++] = sol[j];
 361                                        if (sol[j] == '.')
 362                                                while (sol[j + 1] == '.')
 363                                                        j++;
 364                                } else
 365                                        space = 1;
 366                        }
 367                        while (filename[len - 1] == '.'
 368                               || filename[len - 1] == '-')
 369                                len--;
 370                        filename[len] = 0;
 371                }
 372                if (len + suffix_len >= sizeof(filename))
 373                        return error("Patch pathname too long");
 374                strcpy(filename + len, fmt_patch_suffix);
 375        }
 376
 377        fprintf(realstdout, "%s\n", filename);
 378        if (freopen(filename, "w", stdout) == NULL)
 379                return error("Cannot open patch file %s",filename);
 380
 381        return 0;
 382}
 383
 384static void get_patch_ids(struct rev_info *rev, struct patch_ids *ids, const char *prefix)
 385{
 386        struct rev_info check_rev;
 387        struct commit *commit;
 388        struct object *o1, *o2;
 389        unsigned flags1, flags2;
 390
 391        if (rev->pending.nr != 2)
 392                die("Need exactly one range.");
 393
 394        o1 = rev->pending.objects[0].item;
 395        flags1 = o1->flags;
 396        o2 = rev->pending.objects[1].item;
 397        flags2 = o2->flags;
 398
 399        if ((flags1 & UNINTERESTING) == (flags2 & UNINTERESTING))
 400                die("Not a range.");
 401
 402        init_patch_ids(ids);
 403
 404        /* given a range a..b get all patch ids for b..a */
 405        init_revisions(&check_rev, prefix);
 406        o1->flags ^= UNINTERESTING;
 407        o2->flags ^= UNINTERESTING;
 408        add_pending_object(&check_rev, o1, "o1");
 409        add_pending_object(&check_rev, o2, "o2");
 410        prepare_revision_walk(&check_rev);
 411
 412        while ((commit = get_revision(&check_rev)) != NULL) {
 413                /* ignore merges */
 414                if (commit->parents && commit->parents->next)
 415                        continue;
 416
 417                add_commit_patch_id(commit, ids);
 418        }
 419
 420        /* reset for next revision walk */
 421        clear_commit_marks((struct commit *)o1,
 422                        SEEN | UNINTERESTING | SHOWN | ADDED);
 423        clear_commit_marks((struct commit *)o2,
 424                        SEEN | UNINTERESTING | SHOWN | ADDED);
 425        o1->flags = flags1;
 426        o2->flags = flags2;
 427}
 428
 429static void gen_message_id(char *dest, unsigned int length, char *base)
 430{
 431        const char *committer = git_committer_info(-1);
 432        const char *email_start = strrchr(committer, '<');
 433        const char *email_end = strrchr(committer, '>');
 434        if(!email_start || !email_end || email_start > email_end - 1)
 435                die("Could not extract email from committer identity.");
 436        snprintf(dest, length, "%s.%lu.git.%.*s", base,
 437                 (unsigned long) time(NULL),
 438                 (int)(email_end - email_start - 1), email_start + 1);
 439}
 440
 441int cmd_format_patch(int argc, const char **argv, const char *prefix)
 442{
 443        struct commit *commit;
 444        struct commit **list = NULL;
 445        struct rev_info rev;
 446        int nr = 0, total, i, j;
 447        int use_stdout = 0;
 448        int numbered = 0;
 449        int start_number = -1;
 450        int keep_subject = 0;
 451        int numbered_files = 0;         /* _just_ numbers */
 452        int subject_prefix = 0;
 453        int ignore_if_in_upstream = 0;
 454        int thread = 0;
 455        const char *in_reply_to = NULL;
 456        struct patch_ids ids;
 457        char *add_signoff = NULL;
 458        char message_id[1024];
 459        char ref_message_id[1024];
 460
 461        git_config(git_format_config);
 462        init_revisions(&rev, prefix);
 463        rev.commit_format = CMIT_FMT_EMAIL;
 464        rev.verbose_header = 1;
 465        rev.diff = 1;
 466        rev.combine_merges = 0;
 467        rev.ignore_merges = 1;
 468        rev.diffopt.msg_sep = "";
 469        rev.diffopt.recursive = 1;
 470
 471        rev.subject_prefix = fmt_patch_subject_prefix;
 472        rev.extra_headers = extra_headers;
 473
 474        /*
 475         * Parse the arguments before setup_revisions(), or something
 476         * like "git format-patch -o a123 HEAD^.." may fail; a123 is
 477         * possibly a valid SHA1.
 478         */
 479        for (i = 1, j = 1; i < argc; i++) {
 480                if (!strcmp(argv[i], "--stdout"))
 481                        use_stdout = 1;
 482                else if (!strcmp(argv[i], "-n") ||
 483                                !strcmp(argv[i], "--numbered"))
 484                        numbered = 1;
 485                else if (!prefixcmp(argv[i], "--start-number="))
 486                        start_number = strtol(argv[i] + 15, NULL, 10);
 487                else if (!strcmp(argv[i], "--numbered-files"))
 488                        numbered_files = 1;
 489                else if (!strcmp(argv[i], "--start-number")) {
 490                        i++;
 491                        if (i == argc)
 492                                die("Need a number for --start-number");
 493                        start_number = strtol(argv[i], NULL, 10);
 494                }
 495                else if (!strcmp(argv[i], "-k") ||
 496                                !strcmp(argv[i], "--keep-subject")) {
 497                        keep_subject = 1;
 498                        rev.total = -1;
 499                }
 500                else if (!strcmp(argv[i], "--output-directory") ||
 501                         !strcmp(argv[i], "-o")) {
 502                        i++;
 503                        if (argc <= i)
 504                                die("Which directory?");
 505                        if (output_directory)
 506                                die("Two output directories?");
 507                        output_directory = argv[i];
 508                }
 509                else if (!strcmp(argv[i], "--signoff") ||
 510                         !strcmp(argv[i], "-s")) {
 511                        const char *committer;
 512                        const char *endpos;
 513                        committer = git_committer_info(1);
 514                        endpos = strchr(committer, '>');
 515                        if (!endpos)
 516                                die("bogos committer info %s\n", committer);
 517                        add_signoff = xmalloc(endpos - committer + 2);
 518                        memcpy(add_signoff, committer, endpos - committer + 1);
 519                        add_signoff[endpos - committer + 1] = 0;
 520                }
 521                else if (!strcmp(argv[i], "--attach")) {
 522                        rev.mime_boundary = git_version_string;
 523                        rev.no_inline = 1;
 524                }
 525                else if (!prefixcmp(argv[i], "--attach=")) {
 526                        rev.mime_boundary = argv[i] + 9;
 527                        rev.no_inline = 1;
 528                }
 529                else if (!strcmp(argv[i], "--inline")) {
 530                        rev.mime_boundary = git_version_string;
 531                        rev.no_inline = 0;
 532                }
 533                else if (!prefixcmp(argv[i], "--inline=")) {
 534                        rev.mime_boundary = argv[i] + 9;
 535                        rev.no_inline = 0;
 536                }
 537                else if (!strcmp(argv[i], "--ignore-if-in-upstream"))
 538                        ignore_if_in_upstream = 1;
 539                else if (!strcmp(argv[i], "--thread"))
 540                        thread = 1;
 541                else if (!prefixcmp(argv[i], "--in-reply-to="))
 542                        in_reply_to = argv[i] + 14;
 543                else if (!strcmp(argv[i], "--in-reply-to")) {
 544                        i++;
 545                        if (i == argc)
 546                                die("Need a Message-Id for --in-reply-to");
 547                        in_reply_to = argv[i];
 548                } else if (!prefixcmp(argv[i], "--subject-prefix=")) {
 549                        subject_prefix = 1;
 550                        rev.subject_prefix = argv[i] + 17;
 551                } else if (!prefixcmp(argv[i], "--suffix="))
 552                        fmt_patch_suffix = argv[i] + 9;
 553                else
 554                        argv[j++] = argv[i];
 555        }
 556        argc = j;
 557
 558        if (start_number < 0)
 559                start_number = 1;
 560        if (numbered && keep_subject)
 561                die ("-n and -k are mutually exclusive.");
 562        if (keep_subject && subject_prefix)
 563                die ("--subject-prefix and -k are mutually exclusive.");
 564        if (numbered_files && use_stdout)
 565                die ("--numbered-files and --stdout are mutually exclusive.");
 566
 567        argc = setup_revisions(argc, argv, &rev, "HEAD");
 568        if (argc > 1)
 569                die ("unrecognized argument: %s", argv[1]);
 570
 571        if (!rev.diffopt.output_format)
 572                rev.diffopt.output_format = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_SUMMARY | DIFF_FORMAT_PATCH;
 573
 574        if (!rev.diffopt.text)
 575                rev.diffopt.binary = 1;
 576
 577        if (!output_directory && !use_stdout)
 578                output_directory = prefix;
 579
 580        if (output_directory) {
 581                if (use_stdout)
 582                        die("standard output, or directory, which one?");
 583                if (mkdir(output_directory, 0777) < 0 && errno != EEXIST)
 584                        die("Could not create directory %s",
 585                            output_directory);
 586        }
 587
 588        if (rev.pending.nr == 1) {
 589                if (rev.max_count < 0) {
 590                        rev.pending.objects[0].item->flags |= UNINTERESTING;
 591                        add_head(&rev);
 592                }
 593                /* Otherwise, it is "format-patch -22 HEAD", and
 594                 * get_revision() would return only the specified count.
 595                 */
 596        }
 597
 598        if (ignore_if_in_upstream)
 599                get_patch_ids(&rev, &ids, prefix);
 600
 601        if (!use_stdout)
 602                realstdout = xfdopen(xdup(1), "w");
 603
 604        prepare_revision_walk(&rev);
 605        while ((commit = get_revision(&rev)) != NULL) {
 606                /* ignore merges */
 607                if (commit->parents && commit->parents->next)
 608                        continue;
 609
 610                if (ignore_if_in_upstream &&
 611                                has_commit_patch_id(commit, &ids))
 612                        continue;
 613
 614                nr++;
 615                list = xrealloc(list, nr * sizeof(list[0]));
 616                list[nr - 1] = commit;
 617        }
 618        total = nr;
 619        if (numbered)
 620                rev.total = total + start_number - 1;
 621        rev.add_signoff = add_signoff;
 622        rev.ref_message_id = in_reply_to;
 623        while (0 <= --nr) {
 624                int shown;
 625                commit = list[nr];
 626                rev.nr = total - nr + (start_number - 1);
 627                /* Make the second and subsequent mails replies to the first */
 628                if (thread) {
 629                        if (nr == (total - 2)) {
 630                                strncpy(ref_message_id, message_id,
 631                                        sizeof(ref_message_id));
 632                                ref_message_id[sizeof(ref_message_id)-1]='\0';
 633                                rev.ref_message_id = ref_message_id;
 634                        }
 635                        gen_message_id(message_id, sizeof(message_id),
 636                                       sha1_to_hex(commit->object.sha1));
 637                        rev.message_id = message_id;
 638                }
 639                if (!use_stdout)
 640                        if (reopen_stdout(commit, rev.nr, keep_subject,
 641                                          numbered_files))
 642                                die("Failed to create output files");
 643                shown = log_tree_commit(&rev, commit);
 644                free(commit->buffer);
 645                commit->buffer = NULL;
 646
 647                /* We put one extra blank line between formatted
 648                 * patches and this flag is used by log-tree code
 649                 * to see if it needs to emit a LF before showing
 650                 * the log; when using one file per patch, we do
 651                 * not want the extra blank line.
 652                 */
 653                if (!use_stdout)
 654                        rev.shown_one = 0;
 655                if (shown) {
 656                        if (rev.mime_boundary)
 657                                printf("\n--%s%s--\n\n\n",
 658                                       mime_boundary_leader,
 659                                       rev.mime_boundary);
 660                        else
 661                                printf("-- \n%s\n\n", git_version_string);
 662                }
 663                if (!use_stdout)
 664                        fclose(stdout);
 665        }
 666        free(list);
 667        if (ignore_if_in_upstream)
 668                free_patch_ids(&ids);
 669        return 0;
 670}
 671
 672static int add_pending_commit(const char *arg, struct rev_info *revs, int flags)
 673{
 674        unsigned char sha1[20];
 675        if (get_sha1(arg, sha1) == 0) {
 676                struct commit *commit = lookup_commit_reference(sha1);
 677                if (commit) {
 678                        commit->object.flags |= flags;
 679                        add_pending_object(revs, &commit->object, arg);
 680                        return 0;
 681                }
 682        }
 683        return -1;
 684}
 685
 686static const char cherry_usage[] =
 687"git-cherry [-v] <upstream> [<head>] [<limit>]";
 688int cmd_cherry(int argc, const char **argv, const char *prefix)
 689{
 690        struct rev_info revs;
 691        struct patch_ids ids;
 692        struct commit *commit;
 693        struct commit_list *list = NULL;
 694        const char *upstream;
 695        const char *head = "HEAD";
 696        const char *limit = NULL;
 697        int verbose = 0;
 698
 699        if (argc > 1 && !strcmp(argv[1], "-v")) {
 700                verbose = 1;
 701                argc--;
 702                argv++;
 703        }
 704
 705        switch (argc) {
 706        case 4:
 707                limit = argv[3];
 708                /* FALLTHROUGH */
 709        case 3:
 710                head = argv[2];
 711                /* FALLTHROUGH */
 712        case 2:
 713                upstream = argv[1];
 714                break;
 715        default:
 716                usage(cherry_usage);
 717        }
 718
 719        init_revisions(&revs, prefix);
 720        revs.diff = 1;
 721        revs.combine_merges = 0;
 722        revs.ignore_merges = 1;
 723        revs.diffopt.recursive = 1;
 724
 725        if (add_pending_commit(head, &revs, 0))
 726                die("Unknown commit %s", head);
 727        if (add_pending_commit(upstream, &revs, UNINTERESTING))
 728                die("Unknown commit %s", upstream);
 729
 730        /* Don't say anything if head and upstream are the same. */
 731        if (revs.pending.nr == 2) {
 732                struct object_array_entry *o = revs.pending.objects;
 733                if (hashcmp(o[0].item->sha1, o[1].item->sha1) == 0)
 734                        return 0;
 735        }
 736
 737        get_patch_ids(&revs, &ids, prefix);
 738
 739        if (limit && add_pending_commit(limit, &revs, UNINTERESTING))
 740                die("Unknown commit %s", limit);
 741
 742        /* reverse the list of commits */
 743        prepare_revision_walk(&revs);
 744        while ((commit = get_revision(&revs)) != NULL) {
 745                /* ignore merges */
 746                if (commit->parents && commit->parents->next)
 747                        continue;
 748
 749                commit_list_insert(commit, &list);
 750        }
 751
 752        while (list) {
 753                char sign = '+';
 754
 755                commit = list->item;
 756                if (has_commit_patch_id(commit, &ids))
 757                        sign = '-';
 758
 759                if (verbose) {
 760                        char *buf = NULL;
 761                        unsigned long buflen = 0;
 762                        pretty_print_commit(CMIT_FMT_ONELINE, commit, ~0,
 763                                            &buf, &buflen, 0, NULL, NULL, 0);
 764                        printf("%c %s %s\n", sign,
 765                               sha1_to_hex(commit->object.sha1), buf);
 766                        free(buf);
 767                }
 768                else {
 769                        printf("%c %s\n", sign,
 770                               sha1_to_hex(commit->object.sha1));
 771                }
 772
 773                list = list->next;
 774        }
 775
 776        free_patch_ids(&ids);
 777        return 0;
 778}