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