builtin-log.c

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