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 static const char *fmt_patch_subject_prefix = "PATCH";
  20
  21 /* this is in builtin-diff.c */
  22 void add_head(struct rev_info *revs);
  23
  24 static 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
  34 static 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
  49 static 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->diffopt.recursive = 1;
  59         rev->show_root_diff = default_show_root;
  60         rev->subject_prefix = fmt_patch_subject_prefix;
  61         argc = setup_revisions(argc, argv, rev, "HEAD");
  62         if (rev->diffopt.pickaxe || rev->diffopt.filter)
  63                 rev->always_show_header = 0;
  64         if (rev->diffopt.follow_renames) {
  65                 rev->always_show_header = 0;
  66                 if (rev->diffopt.nr_paths != 1)
  67                         usage("git logs can only follow renames on one pathname at a time");
  68         }
  69         for (i = 1; i < argc; i++) {
  70                 const char *arg = argv[i];
  71                 if (!strcmp(arg, "--decorate")) {
  72                         if (!decorate)
  73                                 for_each_ref(add_ref_decoration, NULL);
  74                         decorate = 1;
  75                 } else
  76                         die("unrecognized argument: %s", arg);
  77         }
  78 }
  79
  80 static int cmd_log_walk(struct rev_info *rev)
  81 {
  82         struct commit *commit;
  83
  84         prepare_revision_walk(rev);
  85         while ((commit = get_revision(rev)) != NULL) {
  86                 log_tree_commit(rev, commit);
  87                 if (!rev->reflog_info) {
  88                         /* we allow cycles in reflog ancestry */
  89                         free(commit->buffer);
  90                         commit->buffer = NULL;
  91                 }
  92                 free_commit_list(commit->parents);
  93                 commit->parents = NULL;
  94         }
  95         return 0;
  96 }
  97
  98 static int git_log_config(const char *var, const char *value)
  99 {
 100         if (!strcmp(var, "format.subjectprefix")) {
 101                 if (!value)
 102                         die("format.subjectprefix without value");
 103                 fmt_patch_subject_prefix = xstrdup(value);
 104                 return 0;
 105         }
 106         if (!strcmp(var, "log.showroot")) {
 107                 default_show_root = git_config_bool(var, value);
 108                 return 0;
 109         }
 110         return git_diff_ui_config(var, value);
 111 }
 112
 113 int cmd_whatchanged(int argc, const char **argv, const char *prefix)
 114 {
 115         struct rev_info rev;
 116
 117         git_config(git_log_config);
 118         init_revisions(&rev, prefix);
 119         rev.diff = 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
 127 static 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
 151 static 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
 159 int 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.combine_merges = 1;
 169         rev.dense_combined_merges = 1;
 170         rev.always_show_header = 1;
 171         rev.ignore_merges = 0;
 172         rev.no_walk = 1;
 173         cmd_log_init(argc, argv, prefix, &rev);
 174
 175         count = rev.pending.nr;
 176         objects = rev.pending.objects;
 177         for (i = 0; i < count && !ret; i++) {
 178                 struct object *o = objects[i].item;
 179                 const char *name = objects[i].name;
 180                 switch (o->type) {
 181                 case OBJ_BLOB:
 182                         ret = show_object(o->sha1, 0);
 183                         break;
 184                 case OBJ_TAG: {
 185                         struct tag *t = (struct tag *)o;
 186
 187                         printf("%stag %s%s\n\n",
 188                                         diff_get_color(rev.diffopt.color_diff,
 189                                                 DIFF_COMMIT),
 190                                         t->tag,
 191                                         diff_get_color(rev.diffopt.color_diff,
 192                                                 DIFF_RESET));
 193                         ret = show_object(o->sha1, 1);
 194                         objects[i].item = (struct object *)t->tagged;
 195                         i--;
 196                         break;
 197                 }
 198                 case OBJ_TREE:
 199                         printf("%stree %s%s\n\n",
 200                                         diff_get_color(rev.diffopt.color_diff,
 201                                                 DIFF_COMMIT),
 202                                         name,
 203                                         diff_get_color(rev.diffopt.color_diff,
 204                                                 DIFF_RESET));
 205                         read_tree_recursive((struct tree *)o, "", 0, 0, NULL,
 206                                         show_tree_object);
 207                         break;
 208                 case OBJ_COMMIT:
 209                         rev.pending.nr = rev.pending.alloc = 0;
 210                         rev.pending.objects = NULL;
 211                         add_object_array(o, name, &rev.pending);
 212                         ret = cmd_log_walk(&rev);
 213                         break;
 214                 default:
 215                         ret = error("Unknown type: %d", o->type);
 216                 }
 217         }
 218         free(objects);
 219         return ret;
 220 }
 221
 222 /*
 223  * This is equivalent to "git log -g --abbrev-commit --pretty=oneline"
 224  */
 225 int cmd_log_reflog(int argc, const char **argv, const char *prefix)
 226 {
 227         struct rev_info rev;
 228
 229         git_config(git_log_config);
 230         init_revisions(&rev, prefix);
 231         init_reflog_walk(&rev.reflog_info);
 232         rev.abbrev_commit = 1;
 233         rev.verbose_header = 1;
 234         cmd_log_init(argc, argv, prefix, &rev);
 235
 236         /*
 237          * This means that we override whatever commit format the user gave
 238          * on the cmd line.  Sad, but cmd_log_init() currently doesn't
 239          * allow us to set a different default.
 240          */
 241         rev.commit_format = CMIT_FMT_ONELINE;
 242         rev.always_show_header = 1;
 243
 244         /*
 245          * We get called through "git reflog", so unlike the other log
 246          * routines, we need to set up our pager manually..
 247          */
 248         setup_pager();
 249
 250         return cmd_log_walk(&rev);
 251 }
 252
 253 int cmd_log(int argc, const char **argv, const char *prefix)
 254 {
 255         struct rev_info rev;
 256
 257         git_config(git_log_config);
 258         init_revisions(&rev, prefix);
 259         rev.always_show_header = 1;
 260         cmd_log_init(argc, argv, prefix, &rev);
 261         return cmd_log_walk(&rev);
 262 }
 263
 264 /* format-patch */
 265 #define FORMAT_PATCH_NAME_MAX 64
 266
 267 static int istitlechar(char c)
 268 {
 269         return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') ||
 270                 (c >= '0' && c <= '9') || c == '.' || c == '_';
 271 }
 272
 273 static char *extra_headers = NULL;
 274 static int extra_headers_size = 0;
 275 static const char *fmt_patch_suffix = ".patch";
 276 static int numbered = 0;
 277 static int auto_number = 0;
 278
 279 static int git_format_config(const char *var, const char *value)
 280 {
 281         if (!strcmp(var, "format.headers")) {
 282                 int len;
 283
 284                 if (!value)
 285                         die("format.headers without value");
 286                 len = strlen(value);
 287                 extra_headers_size += len + 1;
 288                 extra_headers = xrealloc(extra_headers, extra_headers_size);
 289                 extra_headers[extra_headers_size - len - 1] = 0;
 290                 strcat(extra_headers, value);
 291                 return 0;
 292         }
 293         if (!strcmp(var, "format.suffix")) {
 294                 if (!value)
 295                         die("format.suffix without value");
 296                 fmt_patch_suffix = xstrdup(value);
 297                 return 0;
 298         }
 299         if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
 300                 return 0;
 301         }
 302         if (!strcmp(var, "format.numbered")) {
 303                 if (!strcasecmp(value, "auto")) {
 304                         auto_number = 1;
 305                         return 0;
 306                 }
 307
 308                 numbered = git_config_bool(var, value);
 309                 return 0;
 310         }
 311
 312         return git_log_config(var, value);
 313 }
 314
 315
 316 static FILE *realstdout = NULL;
 317 static const char *output_directory = NULL;
 318
 319 static int reopen_stdout(struct commit *commit, int nr, int keep_subject,
 320                          int numbered_files)
 321 {
 322         char filename[PATH_MAX];
 323         char *sol;
 324         int len = 0;
 325         int suffix_len = strlen(fmt_patch_suffix) + 1;
 326
 327         if (output_directory) {
 328                 if (strlen(output_directory) >=
 329                     sizeof(filename) - FORMAT_PATCH_NAME_MAX - suffix_len)
 330                         return error("name of output directory is too long");
 331                 strlcpy(filename, output_directory, sizeof(filename) - suffix_len);
 332                 len = strlen(filename);
 333                 if (filename[len - 1] != '/')
 334                         filename[len++] = '/';
 335         }
 336
 337         if (numbered_files) {
 338                 sprintf(filename + len, "%d", nr);
 339                 len = strlen(filename);
 340
 341         } else {
 342                 sprintf(filename + len, "%04d", nr);
 343                 len = strlen(filename);
 344
 345                 sol = strstr(commit->buffer, "\n\n");
 346                 if (sol) {
 347                         int j, space = 1;
 348
 349                         sol += 2;
 350                         /* strip [PATCH] or [PATCH blabla] */
 351                         if (!keep_subject && !prefixcmp(sol, "[PATCH")) {
 352                                 char *eos = strchr(sol + 6, ']');
 353                                 if (eos) {
 354                                         while (isspace(*eos))
 355                                                 eos++;
 356                                         sol = eos;
 357                                 }
 358                         }
 359
 360                         for (j = 0;
 361                              j < FORMAT_PATCH_NAME_MAX - suffix_len - 5 &&
 362                                      len < sizeof(filename) - suffix_len &&
 363                                      sol[j] && sol[j] != '\n';
 364                              j++) {
 365                                 if (istitlechar(sol[j])) {
 366                                         if (space) {
 367                                                 filename[len++] = '-';
 368                                                 space = 0;
 369                                         }
 370                                         filename[len++] = sol[j];
 371                                         if (sol[j] == '.')
 372                                                 while (sol[j + 1] == '.')
 373                                                         j++;
 374                                 } else
 375                                         space = 1;
 376                         }
 377                         while (filename[len - 1] == '.'
 378                                || filename[len - 1] == '-')
 379                                 len--;
 380                         filename[len] = 0;
 381                 }
 382                 if (len + suffix_len >= sizeof(filename))
 383                         return error("Patch pathname too long");
 384                 strcpy(filename + len, fmt_patch_suffix);
 385         }
 386
 387         fprintf(realstdout, "%s\n", filename);
 388         if (freopen(filename, "w", stdout) == NULL)
 389                 return error("Cannot open patch file %s",filename);
 390
 391         return 0;
 392 }
 393
 394 static void get_patch_ids(struct rev_info *rev, struct patch_ids *ids, const char *prefix)
 395 {
 396         struct rev_info check_rev;
 397         struct commit *commit;
 398         struct object *o1, *o2;
 399         unsigned flags1, flags2;
 400
 401         if (rev->pending.nr != 2)
 402                 die("Need exactly one range.");
 403
 404         o1 = rev->pending.objects[0].item;
 405         flags1 = o1->flags;
 406         o2 = rev->pending.objects[1].item;
 407         flags2 = o2->flags;
 408
 409         if ((flags1 & UNINTERESTING) == (flags2 & UNINTERESTING))
 410                 die("Not a range.");
 411
 412         init_patch_ids(ids);
 413
 414         /* given a range a..b get all patch ids for b..a */
 415         init_revisions(&check_rev, prefix);
 416         o1->flags ^= UNINTERESTING;
 417         o2->flags ^= UNINTERESTING;
 418         add_pending_object(&check_rev, o1, "o1");
 419         add_pending_object(&check_rev, o2, "o2");
 420         prepare_revision_walk(&check_rev);
 421
 422         while ((commit = get_revision(&check_rev)) != NULL) {
 423                 /* ignore merges */
 424                 if (commit->parents && commit->parents->next)
 425                         continue;
 426
 427                 add_commit_patch_id(commit, ids);
 428         }
 429
 430         /* reset for next revision walk */
 431         clear_commit_marks((struct commit *)o1,
 432                         SEEN | UNINTERESTING | SHOWN | ADDED);
 433         clear_commit_marks((struct commit *)o2,
 434                         SEEN | UNINTERESTING | SHOWN | ADDED);
 435         o1->flags = flags1;
 436         o2->flags = flags2;
 437 }
 438
 439 static void gen_message_id(char *dest, unsigned int length, char *base)
 440 {
 441         const char *committer = git_committer_info(-1);
 442         const char *email_start = strrchr(committer, '<');
 443         const char *email_end = strrchr(committer, '>');
 444         if(!email_start || !email_end || email_start > email_end - 1)
 445                 die("Could not extract email from committer identity.");
 446         snprintf(dest, length, "%s.%lu.git.%.*s", base,
 447                  (unsigned long) time(NULL),
 448                  (int)(email_end - email_start - 1), email_start + 1);
 449 }
 450
 451 static const char *clean_message_id(const char *msg_id)
 452 {
 453         char ch;
 454         const char *a, *z, *m;
 455
 456         m = msg_id;
 457         while ((ch = *m) && (isspace(ch) || (ch == '<')))
 458                 m++;
 459         a = m;
 460         z = NULL;
 461         while ((ch = *m)) {
 462                 if (!isspace(ch) && (ch != '>'))
 463                         z = m;
 464                 m++;
 465         }
 466         if (!z)
 467                 die("insane in-reply-to: %s", msg_id);
 468         if (++z == m)
 469                 return a;
 470         return xmemdupz(a, z - a);
 471 }
 472
 473 int cmd_format_patch(int argc, const char **argv, const char *prefix)
 474 {
 475         struct commit *commit;
 476         struct commit **list = NULL;
 477         struct rev_info rev;
 478         int nr = 0, total, i, j;
 479         int use_stdout = 0;
 480         int start_number = -1;
 481         int keep_subject = 0;
 482         int numbered_files = 0;         /* _just_ numbers */
 483         int subject_prefix = 0;
 484         int ignore_if_in_upstream = 0;
 485         int thread = 0;
 486         const char *in_reply_to = NULL;
 487         struct patch_ids ids;
 488         char *add_signoff = NULL;
 489         char message_id[1024];
 490         char ref_message_id[1024];
 491
 492         git_config(git_format_config);
 493         init_revisions(&rev, prefix);
 494         rev.commit_format = CMIT_FMT_EMAIL;
 495         rev.verbose_header = 1;
 496         rev.diff = 1;
 497         rev.combine_merges = 0;
 498         rev.ignore_merges = 1;
 499         rev.diffopt.msg_sep = "";
 500         rev.diffopt.recursive = 1;
 501
 502         rev.subject_prefix = fmt_patch_subject_prefix;
 503         rev.extra_headers = extra_headers;
 504
 505         /*
 506          * Parse the arguments before setup_revisions(), or something
 507          * like "git format-patch -o a123 HEAD^.." may fail; a123 is
 508          * possibly a valid SHA1.
 509          */
 510         for (i = 1, j = 1; i < argc; i++) {
 511                 if (!strcmp(argv[i], "--stdout"))
 512                         use_stdout = 1;
 513                 else if (!strcmp(argv[i], "-n") ||
 514                                 !strcmp(argv[i], "--numbered"))
 515                         numbered = 1;
 516                 else if (!strcmp(argv[i], "-N") ||
 517                                 !strcmp(argv[i], "--no-numbered")) {
 518                         numbered = 0;
 519                         auto_number = 0;
 520                 }
 521                 else if (!prefixcmp(argv[i], "--start-number="))
 522                         start_number = strtol(argv[i] + 15, NULL, 10);
 523                 else if (!strcmp(argv[i], "--numbered-files"))
 524                         numbered_files = 1;
 525                 else if (!strcmp(argv[i], "--start-number")) {
 526                         i++;
 527                         if (i == argc)
 528                                 die("Need a number for --start-number");
 529                         start_number = strtol(argv[i], NULL, 10);
 530                 }
 531                 else if (!strcmp(argv[i], "-k") ||
 532                                 !strcmp(argv[i], "--keep-subject")) {
 533                         keep_subject = 1;
 534                         rev.total = -1;
 535                 }
 536                 else if (!strcmp(argv[i], "--output-directory") ||
 537                          !strcmp(argv[i], "-o")) {
 538                         i++;
 539                         if (argc <= i)
 540                                 die("Which directory?");
 541                         if (output_directory)
 542                                 die("Two output directories?");
 543                         output_directory = argv[i];
 544                 }
 545                 else if (!strcmp(argv[i], "--signoff") ||
 546                          !strcmp(argv[i], "-s")) {
 547                         const char *committer;
 548                         const char *endpos;
 549                         committer = git_committer_info(1);
 550                         endpos = strchr(committer, '>');
 551                         if (!endpos)
 552                                 die("bogos committer info %s\n", committer);
 553                         add_signoff = xmemdupz(committer, endpos - committer + 1);
 554                 }
 555                 else if (!strcmp(argv[i], "--attach")) {
 556                         rev.mime_boundary = git_version_string;
 557                         rev.no_inline = 1;
 558                 }
 559                 else if (!prefixcmp(argv[i], "--attach=")) {
 560                         rev.mime_boundary = argv[i] + 9;
 561                         rev.no_inline = 1;
 562                 }
 563                 else if (!strcmp(argv[i], "--inline")) {
 564                         rev.mime_boundary = git_version_string;
 565                         rev.no_inline = 0;
 566                 }
 567                 else if (!prefixcmp(argv[i], "--inline=")) {
 568                         rev.mime_boundary = argv[i] + 9;
 569                         rev.no_inline = 0;
 570                 }
 571                 else if (!strcmp(argv[i], "--ignore-if-in-upstream"))
 572                         ignore_if_in_upstream = 1;
 573                 else if (!strcmp(argv[i], "--thread"))
 574                         thread = 1;
 575                 else if (!prefixcmp(argv[i], "--in-reply-to="))
 576                         in_reply_to = argv[i] + 14;
 577                 else if (!strcmp(argv[i], "--in-reply-to")) {
 578                         i++;
 579                         if (i == argc)
 580                                 die("Need a Message-Id for --in-reply-to");
 581                         in_reply_to = argv[i];
 582                 } else if (!prefixcmp(argv[i], "--subject-prefix=")) {
 583                         subject_prefix = 1;
 584                         rev.subject_prefix = argv[i] + 17;
 585                 } else if (!prefixcmp(argv[i], "--suffix="))
 586                         fmt_patch_suffix = argv[i] + 9;
 587                 else
 588                         argv[j++] = argv[i];
 589         }
 590         argc = j;
 591
 592         if (start_number < 0)
 593                 start_number = 1;
 594         if (numbered && keep_subject)
 595                 die ("-n and -k are mutually exclusive.");
 596         if (keep_subject && subject_prefix)
 597                 die ("--subject-prefix and -k are mutually exclusive.");
 598         if (numbered_files && use_stdout)
 599                 die ("--numbered-files and --stdout are mutually exclusive.");
 600
 601         argc = setup_revisions(argc, argv, &rev, "HEAD");
 602         if (argc > 1)
 603                 die ("unrecognized argument: %s", argv[1]);
 604
 605         if (!rev.diffopt.output_format)
 606                 rev.diffopt.output_format = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_SUMMARY | DIFF_FORMAT_PATCH;
 607
 608         if (!rev.diffopt.text)
 609                 rev.diffopt.binary = 1;
 610
 611         if (!output_directory && !use_stdout)
 612                 output_directory = prefix;
 613
 614         if (output_directory) {
 615                 if (use_stdout)
 616                         die("standard output, or directory, which one?");
 617                 if (mkdir(output_directory, 0777) < 0 && errno != EEXIST)
 618                         die("Could not create directory %s",
 619                             output_directory);
 620         }
 621
 622         if (rev.pending.nr == 1) {
 623                 if (rev.max_count < 0 && !rev.show_root_diff) {
 624                         /*
 625                          * This is traditional behaviour of "git format-patch
 626                          * origin" that prepares what the origin side still
 627                          * does not have.
 628                          */
 629                         rev.pending.objects[0].item->flags |= UNINTERESTING;
 630                         add_head(&rev);
 631                 }
 632                 /*
 633                  * Otherwise, it is "format-patch -22 HEAD", and/or
 634                  * "format-patch --root HEAD".  The user wants
 635                  * get_revision() to do the usual traversal.
 636                  */
 637         }
 638
 639         if (ignore_if_in_upstream)
 640                 get_patch_ids(&rev, &ids, prefix);
 641
 642         if (!use_stdout)
 643                 realstdout = xfdopen(xdup(1), "w");
 644
 645         prepare_revision_walk(&rev);
 646         while ((commit = get_revision(&rev)) != NULL) {
 647                 /* ignore merges */
 648                 if (commit->parents && commit->parents->next)
 649                         continue;
 650
 651                 if (ignore_if_in_upstream &&
 652                                 has_commit_patch_id(commit, &ids))
 653                         continue;
 654
 655                 nr++;
 656                 list = xrealloc(list, nr * sizeof(list[0]));
 657                 list[nr - 1] = commit;
 658         }
 659         total = nr;
 660         if (!keep_subject && auto_number && total > 1)
 661                 numbered = 1;
 662         if (numbered)
 663                 rev.total = total + start_number - 1;
 664         rev.add_signoff = add_signoff;
 665         if (in_reply_to)
 666                 rev.ref_message_id = clean_message_id(in_reply_to);
 667         while (0 <= --nr) {
 668                 int shown;
 669                 commit = list[nr];
 670                 rev.nr = total - nr + (start_number - 1);
 671                 /* Make the second and subsequent mails replies to the first */
 672                 if (thread) {
 673                         if (nr == (total - 2)) {
 674                                 strncpy(ref_message_id, message_id,
 675                                         sizeof(ref_message_id));
 676                                 ref_message_id[sizeof(ref_message_id)-1]='\0';
 677                                 rev.ref_message_id = ref_message_id;
 678                         }
 679                         gen_message_id(message_id, sizeof(message_id),
 680                                        sha1_to_hex(commit->object.sha1));
 681                         rev.message_id = message_id;
 682                 }
 683                 if (!use_stdout)
 684                         if (reopen_stdout(commit, rev.nr, keep_subject,
 685                                           numbered_files))
 686                                 die("Failed to create output files");
 687                 shown = log_tree_commit(&rev, commit);
 688                 free(commit->buffer);
 689                 commit->buffer = NULL;
 690
 691                 /* We put one extra blank line between formatted
 692                  * patches and this flag is used by log-tree code
 693                  * to see if it needs to emit a LF before showing
 694                  * the log; when using one file per patch, we do
 695                  * not want the extra blank line.
 696                  */
 697                 if (!use_stdout)
 698                         rev.shown_one = 0;
 699                 if (shown) {
 700                         if (rev.mime_boundary)
 701                                 printf("\n--%s%s--\n\n\n",
 702                                        mime_boundary_leader,
 703                                        rev.mime_boundary);
 704                         else
 705                                 printf("-- \n%s\n\n", git_version_string);
 706                 }
 707                 if (!use_stdout)
 708                         fclose(stdout);
 709         }
 710         free(list);
 711         if (ignore_if_in_upstream)
 712                 free_patch_ids(&ids);
 713         return 0;
 714 }
 715
 716 static int add_pending_commit(const char *arg, struct rev_info *revs, int flags)
 717 {
 718         unsigned char sha1[20];
 719         if (get_sha1(arg, sha1) == 0) {
 720                 struct commit *commit = lookup_commit_reference(sha1);
 721                 if (commit) {
 722                         commit->object.flags |= flags;
 723                         add_pending_object(revs, &commit->object, arg);
 724                         return 0;
 725                 }
 726         }
 727         return -1;
 728 }
 729
 730 static const char cherry_usage[] =
 731 "git-cherry [-v] <upstream> [<head>] [<limit>]";
 732 int cmd_cherry(int argc, const char **argv, const char *prefix)
 733 {
 734         struct rev_info revs;
 735         struct patch_ids ids;
 736         struct commit *commit;
 737         struct commit_list *list = NULL;
 738         const char *upstream;
 739         const char *head = "HEAD";
 740         const char *limit = NULL;
 741         int verbose = 0;
 742
 743         if (argc > 1 && !strcmp(argv[1], "-v")) {
 744                 verbose = 1;
 745                 argc--;
 746                 argv++;
 747         }
 748
 749         switch (argc) {
 750         case 4:
 751                 limit = argv[3];
 752                 /* FALLTHROUGH */
 753         case 3:
 754                 head = argv[2];
 755                 /* FALLTHROUGH */
 756         case 2:
 757                 upstream = argv[1];
 758                 break;
 759         default:
 760                 usage(cherry_usage);
 761         }
 762
 763         init_revisions(&revs, prefix);
 764         revs.diff = 1;
 765         revs.combine_merges = 0;
 766         revs.ignore_merges = 1;
 767         revs.diffopt.recursive = 1;
 768
 769         if (add_pending_commit(head, &revs, 0))
 770                 die("Unknown commit %s", head);
 771         if (add_pending_commit(upstream, &revs, UNINTERESTING))
 772                 die("Unknown commit %s", upstream);
 773
 774         /* Don't say anything if head and upstream are the same. */
 775         if (revs.pending.nr == 2) {
 776                 struct object_array_entry *o = revs.pending.objects;
 777                 if (hashcmp(o[0].item->sha1, o[1].item->sha1) == 0)
 778                         return 0;
 779         }
 780
 781         get_patch_ids(&revs, &ids, prefix);
 782
 783         if (limit && add_pending_commit(limit, &revs, UNINTERESTING))
 784                 die("Unknown commit %s", limit);
 785
 786         /* reverse the list of commits */
 787         prepare_revision_walk(&revs);
 788         while ((commit = get_revision(&revs)) != NULL) {
 789                 /* ignore merges */
 790                 if (commit->parents && commit->parents->next)
 791                         continue;
 792
 793                 commit_list_insert(commit, &list);
 794         }
 795
 796         while (list) {
 797                 char sign = '+';
 798
 799                 commit = list->item;
 800                 if (has_commit_patch_id(commit, &ids))
 801                         sign = '-';
 802
 803                 if (verbose) {
 804                         struct strbuf buf;
 805                         strbuf_init(&buf, 0);
 806                         pretty_print_commit(CMIT_FMT_ONELINE, commit,
 807                                             &buf, 0, NULL, NULL, 0, 0);
 808                         printf("%c %s %s\n", sign,
 809                                sha1_to_hex(commit->object.sha1), buf.buf);
 810                         strbuf_release(&buf);
 811                 }
 812                 else {
 813                         printf("%c %s\n", sign,
 814                                sha1_to_hex(commit->object.sha1));
 815                 }
 816
 817                 list = list->next;
 818         }
 819
 820         free_patch_ids(&ids);
 821         return 0;
 822 }