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
 277 static int git_format_config(const char *var, const char *value)
 278 {
 279         if (!strcmp(var, "format.headers")) {
 280                 int len;
 281
 282                 if (!value)
 283                         die("format.headers without value");
 284                 len = strlen(value);
 285                 extra_headers_size += len + 1;
 286                 extra_headers = xrealloc(extra_headers, extra_headers_size);
 287                 extra_headers[extra_headers_size - len - 1] = 0;
 288                 strcat(extra_headers, value);
 289                 return 0;
 290         }
 291         if (!strcmp(var, "format.suffix")) {
 292                 if (!value)
 293                         die("format.suffix without value");
 294                 fmt_patch_suffix = xstrdup(value);
 295                 return 0;
 296         }
 297         if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
 298                 return 0;
 299         }
 300
 301         return git_log_config(var, value);
 302 }
 303
 304
 305 static FILE *realstdout = NULL;
 306 static const char *output_directory = NULL;
 307
 308 static int reopen_stdout(struct commit *commit, int nr, int keep_subject,
 309                          int numbered_files)
 310 {
 311         char filename[PATH_MAX];
 312         char *sol;
 313         int len = 0;
 314         int suffix_len = strlen(fmt_patch_suffix) + 1;
 315
 316         if (output_directory) {
 317                 if (strlen(output_directory) >=
 318                     sizeof(filename) - FORMAT_PATCH_NAME_MAX - suffix_len)
 319                         return error("name of output directory is too long");
 320                 strlcpy(filename, output_directory, sizeof(filename) - suffix_len);
 321                 len = strlen(filename);
 322                 if (filename[len - 1] != '/')
 323                         filename[len++] = '/';
 324         }
 325
 326         if (numbered_files) {
 327                 sprintf(filename + len, "%d", nr);
 328                 len = strlen(filename);
 329
 330         } else {
 331                 sprintf(filename + len, "%04d", nr);
 332                 len = strlen(filename);
 333
 334                 sol = strstr(commit->buffer, "\n\n");
 335                 if (sol) {
 336                         int j, space = 1;
 337
 338                         sol += 2;
 339                         /* strip [PATCH] or [PATCH blabla] */
 340                         if (!keep_subject && !prefixcmp(sol, "[PATCH")) {
 341                                 char *eos = strchr(sol + 6, ']');
 342                                 if (eos) {
 343                                         while (isspace(*eos))
 344                                                 eos++;
 345                                         sol = eos;
 346                                 }
 347                         }
 348
 349                         for (j = 0;
 350                              j < FORMAT_PATCH_NAME_MAX - suffix_len - 5 &&
 351                                      len < sizeof(filename) - suffix_len &&
 352                                      sol[j] && sol[j] != '\n';
 353                              j++) {
 354                                 if (istitlechar(sol[j])) {
 355                                         if (space) {
 356                                                 filename[len++] = '-';
 357                                                 space = 0;
 358                                         }
 359                                         filename[len++] = sol[j];
 360                                         if (sol[j] == '.')
 361                                                 while (sol[j + 1] == '.')
 362                                                         j++;
 363                                 } else
 364                                         space = 1;
 365                         }
 366                         while (filename[len - 1] == '.'
 367                                || filename[len - 1] == '-')
 368                                 len--;
 369                         filename[len] = 0;
 370                 }
 371                 if (len + suffix_len >= sizeof(filename))
 372                         return error("Patch pathname too long");
 373                 strcpy(filename + len, fmt_patch_suffix);
 374         }
 375
 376         fprintf(realstdout, "%s\n", filename);
 377         if (freopen(filename, "w", stdout) == NULL)
 378                 return error("Cannot open patch file %s",filename);
 379
 380         return 0;
 381 }
 382
 383 static void get_patch_ids(struct rev_info *rev, struct patch_ids *ids, const char *prefix)
 384 {
 385         struct rev_info check_rev;
 386         struct commit *commit;
 387         struct object *o1, *o2;
 388         unsigned flags1, flags2;
 389
 390         if (rev->pending.nr != 2)
 391                 die("Need exactly one range.");
 392
 393         o1 = rev->pending.objects[0].item;
 394         flags1 = o1->flags;
 395         o2 = rev->pending.objects[1].item;
 396         flags2 = o2->flags;
 397
 398         if ((flags1 & UNINTERESTING) == (flags2 & UNINTERESTING))
 399                 die("Not a range.");
 400
 401         init_patch_ids(ids);
 402
 403         /* given a range a..b get all patch ids for b..a */
 404         init_revisions(&check_rev, prefix);
 405         o1->flags ^= UNINTERESTING;
 406         o2->flags ^= UNINTERESTING;
 407         add_pending_object(&check_rev, o1, "o1");
 408         add_pending_object(&check_rev, o2, "o2");
 409         prepare_revision_walk(&check_rev);
 410
 411         while ((commit = get_revision(&check_rev)) != NULL) {
 412                 /* ignore merges */
 413                 if (commit->parents && commit->parents->next)
 414                         continue;
 415
 416                 add_commit_patch_id(commit, ids);
 417         }
 418
 419         /* reset for next revision walk */
 420         clear_commit_marks((struct commit *)o1,
 421                         SEEN | UNINTERESTING | SHOWN | ADDED);
 422         clear_commit_marks((struct commit *)o2,
 423                         SEEN | UNINTERESTING | SHOWN | ADDED);
 424         o1->flags = flags1;
 425         o2->flags = flags2;
 426 }
 427
 428 static void gen_message_id(char *dest, unsigned int length, char *base)
 429 {
 430         const char *committer = git_committer_info(-1);
 431         const char *email_start = strrchr(committer, '<');
 432         const char *email_end = strrchr(committer, '>');
 433         if(!email_start || !email_end || email_start > email_end - 1)
 434                 die("Could not extract email from committer identity.");
 435         snprintf(dest, length, "%s.%lu.git.%.*s", base,
 436                  (unsigned long) time(NULL),
 437                  (int)(email_end - email_start - 1), email_start + 1);
 438 }
 439
 440 static const char *clean_message_id(const char *msg_id)
 441 {
 442         char ch;
 443         const char *a, *z, *m;
 444         char *n;
 445         size_t len;
 446
 447         m = msg_id;
 448         while ((ch = *m) && (isspace(ch) || (ch == '<')))
 449                 m++;
 450         a = m;
 451         z = NULL;
 452         while ((ch = *m)) {
 453                 if (!isspace(ch) && (ch != '>'))
 454                         z = m;
 455                 m++;
 456         }
 457         if (!z)
 458                 die("insane in-reply-to: %s", msg_id);
 459         if (++z == m)
 460                 return a;
 461         len = z - a;
 462         n = xmalloc(len + 1);
 463         memcpy(n, a, len);
 464         n[len] = 0;
 465         return n;
 466 }
 467
 468 int cmd_format_patch(int argc, const char **argv, const char *prefix)
 469 {
 470         struct commit *commit;
 471         struct commit **list = NULL;
 472         struct rev_info rev;
 473         int nr = 0, total, i, j;
 474         int use_stdout = 0;
 475         int numbered = 0;
 476         int start_number = -1;
 477         int keep_subject = 0;
 478         int numbered_files = 0;         /* _just_ numbers */
 479         int subject_prefix = 0;
 480         int ignore_if_in_upstream = 0;
 481         int thread = 0;
 482         const char *in_reply_to = NULL;
 483         struct patch_ids ids;
 484         char *add_signoff = NULL;
 485         char message_id[1024];
 486         char ref_message_id[1024];
 487
 488         git_config(git_format_config);
 489         init_revisions(&rev, prefix);
 490         rev.commit_format = CMIT_FMT_EMAIL;
 491         rev.verbose_header = 1;
 492         rev.diff = 1;
 493         rev.combine_merges = 0;
 494         rev.ignore_merges = 1;
 495         rev.diffopt.msg_sep = "";
 496         rev.diffopt.recursive = 1;
 497
 498         rev.subject_prefix = fmt_patch_subject_prefix;
 499         rev.extra_headers = extra_headers;
 500
 501         /*
 502          * Parse the arguments before setup_revisions(), or something
 503          * like "git format-patch -o a123 HEAD^.." may fail; a123 is
 504          * possibly a valid SHA1.
 505          */
 506         for (i = 1, j = 1; i < argc; i++) {
 507                 if (!strcmp(argv[i], "--stdout"))
 508                         use_stdout = 1;
 509                 else if (!strcmp(argv[i], "-n") ||
 510                                 !strcmp(argv[i], "--numbered"))
 511                         numbered = 1;
 512                 else if (!prefixcmp(argv[i], "--start-number="))
 513                         start_number = strtol(argv[i] + 15, NULL, 10);
 514                 else if (!strcmp(argv[i], "--numbered-files"))
 515                         numbered_files = 1;
 516                 else if (!strcmp(argv[i], "--start-number")) {
 517                         i++;
 518                         if (i == argc)
 519                                 die("Need a number for --start-number");
 520                         start_number = strtol(argv[i], NULL, 10);
 521                 }
 522                 else if (!strcmp(argv[i], "-k") ||
 523                                 !strcmp(argv[i], "--keep-subject")) {
 524                         keep_subject = 1;
 525                         rev.total = -1;
 526                 }
 527                 else if (!strcmp(argv[i], "--output-directory") ||
 528                          !strcmp(argv[i], "-o")) {
 529                         i++;
 530                         if (argc <= i)
 531                                 die("Which directory?");
 532                         if (output_directory)
 533                                 die("Two output directories?");
 534                         output_directory = argv[i];
 535                 }
 536                 else if (!strcmp(argv[i], "--signoff") ||
 537                          !strcmp(argv[i], "-s")) {
 538                         const char *committer;
 539                         const char *endpos;
 540                         committer = git_committer_info(1);
 541                         endpos = strchr(committer, '>');
 542                         if (!endpos)
 543                                 die("bogos committer info %s\n", committer);
 544                         add_signoff = xmalloc(endpos - committer + 2);
 545                         memcpy(add_signoff, committer, endpos - committer + 1);
 546                         add_signoff[endpos - committer + 1] = 0;
 547                 }
 548                 else if (!strcmp(argv[i], "--attach")) {
 549                         rev.mime_boundary = git_version_string;
 550                         rev.no_inline = 1;
 551                 }
 552                 else if (!prefixcmp(argv[i], "--attach=")) {
 553                         rev.mime_boundary = argv[i] + 9;
 554                         rev.no_inline = 1;
 555                 }
 556                 else if (!strcmp(argv[i], "--inline")) {
 557                         rev.mime_boundary = git_version_string;
 558                         rev.no_inline = 0;
 559                 }
 560                 else if (!prefixcmp(argv[i], "--inline=")) {
 561                         rev.mime_boundary = argv[i] + 9;
 562                         rev.no_inline = 0;
 563                 }
 564                 else if (!strcmp(argv[i], "--ignore-if-in-upstream"))
 565                         ignore_if_in_upstream = 1;
 566                 else if (!strcmp(argv[i], "--thread"))
 567                         thread = 1;
 568                 else if (!prefixcmp(argv[i], "--in-reply-to="))
 569                         in_reply_to = argv[i] + 14;
 570                 else if (!strcmp(argv[i], "--in-reply-to")) {
 571                         i++;
 572                         if (i == argc)
 573                                 die("Need a Message-Id for --in-reply-to");
 574                         in_reply_to = argv[i];
 575                 } else if (!prefixcmp(argv[i], "--subject-prefix=")) {
 576                         subject_prefix = 1;
 577                         rev.subject_prefix = argv[i] + 17;
 578                 } else if (!prefixcmp(argv[i], "--suffix="))
 579                         fmt_patch_suffix = argv[i] + 9;
 580                 else
 581                         argv[j++] = argv[i];
 582         }
 583         argc = j;
 584
 585         if (start_number < 0)
 586                 start_number = 1;
 587         if (numbered && keep_subject)
 588                 die ("-n and -k are mutually exclusive.");
 589         if (keep_subject && subject_prefix)
 590                 die ("--subject-prefix and -k are mutually exclusive.");
 591         if (numbered_files && use_stdout)
 592                 die ("--numbered-files and --stdout are mutually exclusive.");
 593
 594         argc = setup_revisions(argc, argv, &rev, "HEAD");
 595         if (argc > 1)
 596                 die ("unrecognized argument: %s", argv[1]);
 597
 598         if (!rev.diffopt.output_format)
 599                 rev.diffopt.output_format = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_SUMMARY | DIFF_FORMAT_PATCH;
 600
 601         if (!rev.diffopt.text)
 602                 rev.diffopt.binary = 1;
 603
 604         if (!output_directory && !use_stdout)
 605                 output_directory = prefix;
 606
 607         if (output_directory) {
 608                 if (use_stdout)
 609                         die("standard output, or directory, which one?");
 610                 if (mkdir(output_directory, 0777) < 0 && errno != EEXIST)
 611                         die("Could not create directory %s",
 612                             output_directory);
 613         }
 614
 615         if (rev.pending.nr == 1) {
 616                 if (rev.max_count < 0 && !rev.show_root_diff) {
 617                         /*
 618                          * This is traditional behaviour of "git format-patch
 619                          * origin" that prepares what the origin side still
 620                          * does not have.
 621                          */
 622                         rev.pending.objects[0].item->flags |= UNINTERESTING;
 623                         add_head(&rev);
 624                 }
 625                 /*
 626                  * Otherwise, it is "format-patch -22 HEAD", and/or
 627                  * "format-patch --root HEAD".  The user wants
 628                  * get_revision() to do the usual traversal.
 629                  */
 630         }
 631
 632         if (ignore_if_in_upstream)
 633                 get_patch_ids(&rev, &ids, prefix);
 634
 635         if (!use_stdout)
 636                 realstdout = xfdopen(xdup(1), "w");
 637
 638         prepare_revision_walk(&rev);
 639         while ((commit = get_revision(&rev)) != NULL) {
 640                 /* ignore merges */
 641                 if (commit->parents && commit->parents->next)
 642                         continue;
 643
 644                 if (ignore_if_in_upstream &&
 645                                 has_commit_patch_id(commit, &ids))
 646                         continue;
 647
 648                 nr++;
 649                 list = xrealloc(list, nr * sizeof(list[0]));
 650                 list[nr - 1] = commit;
 651         }
 652         total = nr;
 653         if (numbered)
 654                 rev.total = total + start_number - 1;
 655         rev.add_signoff = add_signoff;
 656         if (in_reply_to)
 657                 rev.ref_message_id = clean_message_id(in_reply_to);
 658         while (0 <= --nr) {
 659                 int shown;
 660                 commit = list[nr];
 661                 rev.nr = total - nr + (start_number - 1);
 662                 /* Make the second and subsequent mails replies to the first */
 663                 if (thread) {
 664                         if (nr == (total - 2)) {
 665                                 strncpy(ref_message_id, message_id,
 666                                         sizeof(ref_message_id));
 667                                 ref_message_id[sizeof(ref_message_id)-1]='\0';
 668                                 rev.ref_message_id = ref_message_id;
 669                         }
 670                         gen_message_id(message_id, sizeof(message_id),
 671                                        sha1_to_hex(commit->object.sha1));
 672                         rev.message_id = message_id;
 673                 }
 674                 if (!use_stdout)
 675                         if (reopen_stdout(commit, rev.nr, keep_subject,
 676                                           numbered_files))
 677                                 die("Failed to create output files");
 678                 shown = log_tree_commit(&rev, commit);
 679                 free(commit->buffer);
 680                 commit->buffer = NULL;
 681
 682                 /* We put one extra blank line between formatted
 683                  * patches and this flag is used by log-tree code
 684                  * to see if it needs to emit a LF before showing
 685                  * the log; when using one file per patch, we do
 686                  * not want the extra blank line.
 687                  */
 688                 if (!use_stdout)
 689                         rev.shown_one = 0;
 690                 if (shown) {
 691                         if (rev.mime_boundary)
 692                                 printf("\n--%s%s--\n\n\n",
 693                                        mime_boundary_leader,
 694                                        rev.mime_boundary);
 695                         else
 696                                 printf("-- \n%s\n\n", git_version_string);
 697                 }
 698                 if (!use_stdout)
 699                         fclose(stdout);
 700         }
 701         free(list);
 702         if (ignore_if_in_upstream)
 703                 free_patch_ids(&ids);
 704         return 0;
 705 }
 706
 707 static int add_pending_commit(const char *arg, struct rev_info *revs, int flags)
 708 {
 709         unsigned char sha1[20];
 710         if (get_sha1(arg, sha1) == 0) {
 711                 struct commit *commit = lookup_commit_reference(sha1);
 712                 if (commit) {
 713                         commit->object.flags |= flags;
 714                         add_pending_object(revs, &commit->object, arg);
 715                         return 0;
 716                 }
 717         }
 718         return -1;
 719 }
 720
 721 static const char cherry_usage[] =
 722 "git-cherry [-v] <upstream> [<head>] [<limit>]";
 723 int cmd_cherry(int argc, const char **argv, const char *prefix)
 724 {
 725         struct rev_info revs;
 726         struct patch_ids ids;
 727         struct commit *commit;
 728         struct commit_list *list = NULL;
 729         const char *upstream;
 730         const char *head = "HEAD";
 731         const char *limit = NULL;
 732         int verbose = 0;
 733
 734         if (argc > 1 && !strcmp(argv[1], "-v")) {
 735                 verbose = 1;
 736                 argc--;
 737                 argv++;
 738         }
 739
 740         switch (argc) {
 741         case 4:
 742                 limit = argv[3];
 743                 /* FALLTHROUGH */
 744         case 3:
 745                 head = argv[2];
 746                 /* FALLTHROUGH */
 747         case 2:
 748                 upstream = argv[1];
 749                 break;
 750         default:
 751                 usage(cherry_usage);
 752         }
 753
 754         init_revisions(&revs, prefix);
 755         revs.diff = 1;
 756         revs.combine_merges = 0;
 757         revs.ignore_merges = 1;
 758         revs.diffopt.recursive = 1;
 759
 760         if (add_pending_commit(head, &revs, 0))
 761                 die("Unknown commit %s", head);
 762         if (add_pending_commit(upstream, &revs, UNINTERESTING))
 763                 die("Unknown commit %s", upstream);
 764
 765         /* Don't say anything if head and upstream are the same. */
 766         if (revs.pending.nr == 2) {
 767                 struct object_array_entry *o = revs.pending.objects;
 768                 if (hashcmp(o[0].item->sha1, o[1].item->sha1) == 0)
 769                         return 0;
 770         }
 771
 772         get_patch_ids(&revs, &ids, prefix);
 773
 774         if (limit && add_pending_commit(limit, &revs, UNINTERESTING))
 775                 die("Unknown commit %s", limit);
 776
 777         /* reverse the list of commits */
 778         prepare_revision_walk(&revs);
 779         while ((commit = get_revision(&revs)) != NULL) {
 780                 /* ignore merges */
 781                 if (commit->parents && commit->parents->next)
 782                         continue;
 783
 784                 commit_list_insert(commit, &list);
 785         }
 786
 787         while (list) {
 788                 char sign = '+';
 789
 790                 commit = list->item;
 791                 if (has_commit_patch_id(commit, &ids))
 792                         sign = '-';
 793
 794                 if (verbose) {
 795                         char *buf = NULL;
 796                         unsigned long buflen = 0;
 797                         pretty_print_commit(CMIT_FMT_ONELINE, commit, ~0,
 798                                             &buf, &buflen, 0, NULL, NULL, 0);
 799                         printf("%c %s %s\n", sign,
 800                                sha1_to_hex(commit->object.sha1), buf);
 801                         free(buf);
 802                 }
 803                 else {
 804                         printf("%c %s\n", sign,
 805                                sha1_to_hex(commit->object.sha1));
 806                 }
 807
 808                 list = list->next;
 809         }
 810
 811         free_patch_ids(&ids);
 812         return 0;
 813 }