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