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 static void add_name_decoration(const char *prefix, const char *name, struct object *obj)
  22 {
  23         int plen = strlen(prefix);
  24         int nlen = strlen(name);
  25         struct name_decoration *res = xmalloc(sizeof(struct name_decoration) + plen + nlen);
  26         memcpy(res->name, prefix, plen);
  27         memcpy(res->name + plen, name, nlen + 1);
  28         res->next = add_decoration(&name_decoration, obj, res);
  29 }
  30
  31 static int add_ref_decoration(const char *refname, const unsigned char *sha1, int flags, void *cb_data)
  32 {
  33         struct object *obj = parse_object(sha1);
  34         if (!obj)
  35                 return 0;
  36         add_name_decoration("", refname, obj);
  37         while (obj->type == OBJ_TAG) {
  38                 obj = ((struct tag *)obj)->tagged;
  39                 if (!obj)
  40                         break;
  41                 add_name_decoration("tag: ", refname, obj);
  42         }
  43         return 0;
  44 }
  45
  46 static void cmd_log_init(int argc, const char **argv, const char *prefix,
  47                       struct rev_info *rev)
  48 {
  49         int i;
  50         int decorate = 0;
  51
  52         rev->abbrev = DEFAULT_ABBREV;
  53         rev->commit_format = CMIT_FMT_DEFAULT;
  54         rev->verbose_header = 1;
  55         DIFF_OPT_SET(&rev->diffopt, RECURSIVE);
  56         rev->show_root_diff = default_show_root;
  57         rev->subject_prefix = fmt_patch_subject_prefix;
  58         argc = setup_revisions(argc, argv, rev, "HEAD");
  59         if (rev->diffopt.pickaxe || rev->diffopt.filter)
  60                 rev->always_show_header = 0;
  61         if (DIFF_OPT_TST(&rev->diffopt, FOLLOW_RENAMES)) {
  62                 rev->always_show_header = 0;
  63                 if (rev->diffopt.nr_paths != 1)
  64                         usage("git logs can only follow renames on one pathname at a time");
  65         }
  66         for (i = 1; i < argc; i++) {
  67                 const char *arg = argv[i];
  68                 if (!strcmp(arg, "--decorate")) {
  69                         if (!decorate)
  70                                 for_each_ref(add_ref_decoration, NULL);
  71                         decorate = 1;
  72                 } else
  73                         die("unrecognized argument: %s", arg);
  74         }
  75 }
  76
  77 /*
  78  * This gives a rough estimate for how many commits we
  79  * will print out in the list.
  80  */
  81 static int estimate_commit_count(struct rev_info *rev, struct commit_list *list)
  82 {
  83         int n = 0;
  84
  85         while (list) {
  86                 struct commit *commit = list->item;
  87                 unsigned int flags = commit->object.flags;
  88                 list = list->next;
  89                 if (!(flags & (TREESAME | UNINTERESTING)))
  90                         n++;
  91         }
  92         return n;
  93 }
  94
  95 static void show_early_header(struct rev_info *rev, const char *stage, int nr)
  96 {
  97         if (rev->shown_one) {
  98                 rev->shown_one = 0;
  99                 if (rev->commit_format != CMIT_FMT_ONELINE)
 100                         putchar(rev->diffopt.line_termination);
 101         }
 102         printf("Final output: %d %s\n", nr, stage);
 103 }
 104
 105 struct itimerval early_output_timer;
 106
 107 static void log_show_early(struct rev_info *revs, struct commit_list *list)
 108 {
 109         int i = revs->early_output;
 110         int show_header = 1;
 111
 112         sort_in_topological_order(&list, revs->lifo);
 113         while (list && i) {
 114                 struct commit *commit = list->item;
 115                 switch (simplify_commit(revs, commit)) {
 116                 case commit_show:
 117                         if (show_header) {
 118                                 int n = estimate_commit_count(revs, list);
 119                                 show_early_header(revs, "incomplete", n);
 120                                 show_header = 0;
 121                         }
 122                         log_tree_commit(revs, commit);
 123                         i--;
 124                         break;
 125                 case commit_ignore:
 126                         break;
 127                 case commit_error:
 128                         return;
 129                 }
 130                 list = list->next;
 131         }
 132
 133         /* Did we already get enough commits for the early output? */
 134         if (!i)
 135                 return;
 136
 137         /*
 138          * ..if no, then repeat it twice a second until we
 139          * do.
 140          *
 141          * NOTE! We don't use "it_interval", because if the
 142          * reader isn't listening, we want our output to be
 143          * throttled by the writing, and not have the timer
 144          * trigger every second even if we're blocked on a
 145          * reader!
 146          */
 147         early_output_timer.it_value.tv_sec = 0;
 148         early_output_timer.it_value.tv_usec = 500000;
 149         setitimer(ITIMER_REAL, &early_output_timer, NULL);
 150 }
 151
 152 static void early_output(int signal)
 153 {
 154         show_early_output = log_show_early;
 155 }
 156
 157 static void setup_early_output(struct rev_info *rev)
 158 {
 159         struct sigaction sa;
 160
 161         /*
 162          * Set up the signal handler, minimally intrusively:
 163          * we only set a single volatile integer word (not
 164          * using sigatomic_t - trying to avoid unnecessary
 165          * system dependencies and headers), and using
 166          * SA_RESTART.
 167          */
 168         memset(&sa, 0, sizeof(sa));
 169         sa.sa_handler = early_output;
 170         sigemptyset(&sa.sa_mask);
 171         sa.sa_flags = SA_RESTART;
 172         sigaction(SIGALRM, &sa, NULL);
 173
 174         /*
 175          * If we can get the whole output in less than a
 176          * tenth of a second, don't even bother doing the
 177          * early-output thing..
 178          *
 179          * This is a one-time-only trigger.
 180          */
 181         early_output_timer.it_value.tv_sec = 0;
 182         early_output_timer.it_value.tv_usec = 100000;
 183         setitimer(ITIMER_REAL, &early_output_timer, NULL);
 184 }
 185
 186 static void finish_early_output(struct rev_info *rev)
 187 {
 188         int n = estimate_commit_count(rev, rev->commits);
 189         signal(SIGALRM, SIG_IGN);
 190         show_early_header(rev, "done", n);
 191 }
 192
 193 static int cmd_log_walk(struct rev_info *rev)
 194 {
 195         struct commit *commit;
 196
 197         if (rev->early_output)
 198                 setup_early_output(rev);
 199
 200         prepare_revision_walk(rev);
 201
 202         if (rev->early_output)
 203                 finish_early_output(rev);
 204
 205         while ((commit = get_revision(rev)) != NULL) {
 206                 log_tree_commit(rev, commit);
 207                 if (!rev->reflog_info) {
 208                         /* we allow cycles in reflog ancestry */
 209                         free(commit->buffer);
 210                         commit->buffer = NULL;
 211                 }
 212                 free_commit_list(commit->parents);
 213                 commit->parents = NULL;
 214         }
 215         return 0;
 216 }
 217
 218 static int git_log_config(const char *var, const char *value)
 219 {
 220         if (!strcmp(var, "format.subjectprefix")) {
 221                 if (!value)
 222                         die("format.subjectprefix without value");
 223                 fmt_patch_subject_prefix = xstrdup(value);
 224                 return 0;
 225         }
 226         if (!strcmp(var, "log.showroot")) {
 227                 default_show_root = git_config_bool(var, value);
 228                 return 0;
 229         }
 230         return git_diff_ui_config(var, value);
 231 }
 232
 233 int cmd_whatchanged(int argc, const char **argv, const char *prefix)
 234 {
 235         struct rev_info rev;
 236
 237         git_config(git_log_config);
 238         init_revisions(&rev, prefix);
 239         rev.diff = 1;
 240         rev.simplify_history = 0;
 241         cmd_log_init(argc, argv, prefix, &rev);
 242         if (!rev.diffopt.output_format)
 243                 rev.diffopt.output_format = DIFF_FORMAT_RAW;
 244         return cmd_log_walk(&rev);
 245 }
 246
 247 static int show_object(const unsigned char *sha1, int suppress_header)
 248 {
 249         unsigned long size;
 250         enum object_type type;
 251         char *buf = read_sha1_file(sha1, &type, &size);
 252         int offset = 0;
 253
 254         if (!buf)
 255                 return error("Could not read object %s", sha1_to_hex(sha1));
 256
 257         if (suppress_header)
 258                 while (offset < size && buf[offset++] != '\n') {
 259                         int new_offset = offset;
 260                         while (new_offset < size && buf[new_offset++] != '\n')
 261                                 ; /* do nothing */
 262                         offset = new_offset;
 263                 }
 264
 265         if (offset < size)
 266                 fwrite(buf + offset, size - offset, 1, stdout);
 267         free(buf);
 268         return 0;
 269 }
 270
 271 static int show_tree_object(const unsigned char *sha1,
 272                 const char *base, int baselen,
 273                 const char *pathname, unsigned mode, int stage)
 274 {
 275         printf("%s%s\n", pathname, S_ISDIR(mode) ? "/" : "");
 276         return 0;
 277 }
 278
 279 int cmd_show(int argc, const char **argv, const char *prefix)
 280 {
 281         struct rev_info rev;
 282         struct object_array_entry *objects;
 283         int i, count, ret = 0;
 284
 285         git_config(git_log_config);
 286         init_revisions(&rev, prefix);
 287         rev.diff = 1;
 288         rev.combine_merges = 1;
 289         rev.dense_combined_merges = 1;
 290         rev.always_show_header = 1;
 291         rev.ignore_merges = 0;
 292         rev.no_walk = 1;
 293         cmd_log_init(argc, argv, prefix, &rev);
 294
 295         count = rev.pending.nr;
 296         objects = rev.pending.objects;
 297         for (i = 0; i < count && !ret; i++) {
 298                 struct object *o = objects[i].item;
 299                 const char *name = objects[i].name;
 300                 switch (o->type) {
 301                 case OBJ_BLOB:
 302                         ret = show_object(o->sha1, 0);
 303                         break;
 304                 case OBJ_TAG: {
 305                         struct tag *t = (struct tag *)o;
 306
 307                         printf("%stag %s%s\n\n",
 308                                         diff_get_color_opt(&rev.diffopt, DIFF_COMMIT),
 309                                         t->tag,
 310                                         diff_get_color_opt(&rev.diffopt, DIFF_RESET));
 311                         ret = show_object(o->sha1, 1);
 312                         objects[i].item = (struct object *)t->tagged;
 313                         i--;
 314                         break;
 315                 }
 316                 case OBJ_TREE:
 317                         printf("%stree %s%s\n\n",
 318                                         diff_get_color_opt(&rev.diffopt, DIFF_COMMIT),
 319                                         name,
 320                                         diff_get_color_opt(&rev.diffopt, DIFF_RESET));
 321                         read_tree_recursive((struct tree *)o, "", 0, 0, NULL,
 322                                         show_tree_object);
 323                         break;
 324                 case OBJ_COMMIT:
 325                         rev.pending.nr = rev.pending.alloc = 0;
 326                         rev.pending.objects = NULL;
 327                         add_object_array(o, name, &rev.pending);
 328                         ret = cmd_log_walk(&rev);
 329                         break;
 330                 default:
 331                         ret = error("Unknown type: %d", o->type);
 332                 }
 333         }
 334         free(objects);
 335         return ret;
 336 }
 337
 338 /*
 339  * This is equivalent to "git log -g --abbrev-commit --pretty=oneline"
 340  */
 341 int cmd_log_reflog(int argc, const char **argv, const char *prefix)
 342 {
 343         struct rev_info rev;
 344
 345         git_config(git_log_config);
 346         init_revisions(&rev, prefix);
 347         init_reflog_walk(&rev.reflog_info);
 348         rev.abbrev_commit = 1;
 349         rev.verbose_header = 1;
 350         cmd_log_init(argc, argv, prefix, &rev);
 351
 352         /*
 353          * This means that we override whatever commit format the user gave
 354          * on the cmd line.  Sad, but cmd_log_init() currently doesn't
 355          * allow us to set a different default.
 356          */
 357         rev.commit_format = CMIT_FMT_ONELINE;
 358         rev.always_show_header = 1;
 359
 360         /*
 361          * We get called through "git reflog", so unlike the other log
 362          * routines, we need to set up our pager manually..
 363          */
 364         setup_pager();
 365
 366         return cmd_log_walk(&rev);
 367 }
 368
 369 int cmd_log(int argc, const char **argv, const char *prefix)
 370 {
 371         struct rev_info rev;
 372
 373         git_config(git_log_config);
 374         init_revisions(&rev, prefix);
 375         rev.always_show_header = 1;
 376         cmd_log_init(argc, argv, prefix, &rev);
 377         return cmd_log_walk(&rev);
 378 }
 379
 380 /* format-patch */
 381 #define FORMAT_PATCH_NAME_MAX 64
 382
 383 static int istitlechar(char c)
 384 {
 385         return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') ||
 386                 (c >= '0' && c <= '9') || c == '.' || c == '_';
 387 }
 388
 389 static char *extra_headers = NULL;
 390 static int extra_headers_size = 0;
 391 static const char *fmt_patch_suffix = ".patch";
 392 static int numbered = 0;
 393 static int auto_number = 0;
 394
 395 static int git_format_config(const char *var, const char *value)
 396 {
 397         if (!strcmp(var, "format.headers")) {
 398                 int len;
 399
 400                 if (!value)
 401                         die("format.headers without value");
 402                 len = strlen(value);
 403                 extra_headers_size += len + 1;
 404                 extra_headers = xrealloc(extra_headers, extra_headers_size);
 405                 extra_headers[extra_headers_size - len - 1] = 0;
 406                 strcat(extra_headers, value);
 407                 return 0;
 408         }
 409         if (!strcmp(var, "format.suffix")) {
 410                 if (!value)
 411                         die("format.suffix without value");
 412                 fmt_patch_suffix = xstrdup(value);
 413                 return 0;
 414         }
 415         if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
 416                 return 0;
 417         }
 418         if (!strcmp(var, "format.numbered")) {
 419                 if (!strcasecmp(value, "auto")) {
 420                         auto_number = 1;
 421                         return 0;
 422                 }
 423
 424                 numbered = git_config_bool(var, value);
 425                 return 0;
 426         }
 427
 428         return git_log_config(var, value);
 429 }
 430
 431
 432 static FILE *realstdout = NULL;
 433 static const char *output_directory = NULL;
 434
 435 static int reopen_stdout(struct commit *commit, int nr, int keep_subject,
 436                          int numbered_files)
 437 {
 438         char filename[PATH_MAX];
 439         char *sol;
 440         int len = 0;
 441         int suffix_len = strlen(fmt_patch_suffix) + 1;
 442
 443         if (output_directory) {
 444                 if (strlen(output_directory) >=
 445                     sizeof(filename) - FORMAT_PATCH_NAME_MAX - suffix_len)
 446                         return error("name of output directory is too long");
 447                 strlcpy(filename, output_directory, sizeof(filename) - suffix_len);
 448                 len = strlen(filename);
 449                 if (filename[len - 1] != '/')
 450                         filename[len++] = '/';
 451         }
 452
 453         if (numbered_files) {
 454                 sprintf(filename + len, "%d", nr);
 455                 len = strlen(filename);
 456
 457         } else {
 458                 sprintf(filename + len, "%04d", nr);
 459                 len = strlen(filename);
 460
 461                 sol = strstr(commit->buffer, "\n\n");
 462                 if (sol) {
 463                         int j, space = 1;
 464
 465                         sol += 2;
 466                         /* strip [PATCH] or [PATCH blabla] */
 467                         if (!keep_subject && !prefixcmp(sol, "[PATCH")) {
 468                                 char *eos = strchr(sol + 6, ']');
 469                                 if (eos) {
 470                                         while (isspace(*eos))
 471                                                 eos++;
 472                                         sol = eos;
 473                                 }
 474                         }
 475
 476                         for (j = 0;
 477                              j < FORMAT_PATCH_NAME_MAX - suffix_len - 5 &&
 478                                      len < sizeof(filename) - suffix_len &&
 479                                      sol[j] && sol[j] != '\n';
 480                              j++) {
 481                                 if (istitlechar(sol[j])) {
 482                                         if (space) {
 483                                                 filename[len++] = '-';
 484                                                 space = 0;
 485                                         }
 486                                         filename[len++] = sol[j];
 487                                         if (sol[j] == '.')
 488                                                 while (sol[j + 1] == '.')
 489                                                         j++;
 490                                 } else
 491                                         space = 1;
 492                         }
 493                         while (filename[len - 1] == '.'
 494                                || filename[len - 1] == '-')
 495                                 len--;
 496                         filename[len] = 0;
 497                 }
 498                 if (len + suffix_len >= sizeof(filename))
 499                         return error("Patch pathname too long");
 500                 strcpy(filename + len, fmt_patch_suffix);
 501         }
 502
 503         fprintf(realstdout, "%s\n", filename);
 504         if (freopen(filename, "w", stdout) == NULL)
 505                 return error("Cannot open patch file %s",filename);
 506
 507         return 0;
 508 }
 509
 510 static void get_patch_ids(struct rev_info *rev, struct patch_ids *ids, const char *prefix)
 511 {
 512         struct rev_info check_rev;
 513         struct commit *commit;
 514         struct object *o1, *o2;
 515         unsigned flags1, flags2;
 516
 517         if (rev->pending.nr != 2)
 518                 die("Need exactly one range.");
 519
 520         o1 = rev->pending.objects[0].item;
 521         flags1 = o1->flags;
 522         o2 = rev->pending.objects[1].item;
 523         flags2 = o2->flags;
 524
 525         if ((flags1 & UNINTERESTING) == (flags2 & UNINTERESTING))
 526                 die("Not a range.");
 527
 528         init_patch_ids(ids);
 529
 530         /* given a range a..b get all patch ids for b..a */
 531         init_revisions(&check_rev, prefix);
 532         o1->flags ^= UNINTERESTING;
 533         o2->flags ^= UNINTERESTING;
 534         add_pending_object(&check_rev, o1, "o1");
 535         add_pending_object(&check_rev, o2, "o2");
 536         prepare_revision_walk(&check_rev);
 537
 538         while ((commit = get_revision(&check_rev)) != NULL) {
 539                 /* ignore merges */
 540                 if (commit->parents && commit->parents->next)
 541                         continue;
 542
 543                 add_commit_patch_id(commit, ids);
 544         }
 545
 546         /* reset for next revision walk */
 547         clear_commit_marks((struct commit *)o1,
 548                         SEEN | UNINTERESTING | SHOWN | ADDED);
 549         clear_commit_marks((struct commit *)o2,
 550                         SEEN | UNINTERESTING | SHOWN | ADDED);
 551         o1->flags = flags1;
 552         o2->flags = flags2;
 553 }
 554
 555 static void gen_message_id(char *dest, unsigned int length, char *base)
 556 {
 557         const char *committer = git_committer_info(IDENT_WARN_ON_NO_NAME);
 558         const char *email_start = strrchr(committer, '<');
 559         const char *email_end = strrchr(committer, '>');
 560         if(!email_start || !email_end || email_start > email_end - 1)
 561                 die("Could not extract email from committer identity.");
 562         snprintf(dest, length, "%s.%lu.git.%.*s", base,
 563                  (unsigned long) time(NULL),
 564                  (int)(email_end - email_start - 1), email_start + 1);
 565 }
 566
 567 static const char *clean_message_id(const char *msg_id)
 568 {
 569         char ch;
 570         const char *a, *z, *m;
 571
 572         m = msg_id;
 573         while ((ch = *m) && (isspace(ch) || (ch == '<')))
 574                 m++;
 575         a = m;
 576         z = NULL;
 577         while ((ch = *m)) {
 578                 if (!isspace(ch) && (ch != '>'))
 579                         z = m;
 580                 m++;
 581         }
 582         if (!z)
 583                 die("insane in-reply-to: %s", msg_id);
 584         if (++z == m)
 585                 return a;
 586         return xmemdupz(a, z - a);
 587 }
 588
 589 int cmd_format_patch(int argc, const char **argv, const char *prefix)
 590 {
 591         struct commit *commit;
 592         struct commit **list = NULL;
 593         struct rev_info rev;
 594         int nr = 0, total, i, j;
 595         int use_stdout = 0;
 596         int start_number = -1;
 597         int keep_subject = 0;
 598         int numbered_files = 0;         /* _just_ numbers */
 599         int subject_prefix = 0;
 600         int ignore_if_in_upstream = 0;
 601         int thread = 0;
 602         const char *in_reply_to = NULL;
 603         struct patch_ids ids;
 604         char *add_signoff = NULL;
 605         char message_id[1024];
 606         char ref_message_id[1024];
 607
 608         git_config(git_format_config);
 609         init_revisions(&rev, prefix);
 610         rev.commit_format = CMIT_FMT_EMAIL;
 611         rev.verbose_header = 1;
 612         rev.diff = 1;
 613         rev.combine_merges = 0;
 614         rev.ignore_merges = 1;
 615         rev.diffopt.msg_sep = "";
 616         DIFF_OPT_SET(&rev.diffopt, RECURSIVE);
 617
 618         rev.subject_prefix = fmt_patch_subject_prefix;
 619         rev.extra_headers = extra_headers;
 620
 621         /*
 622          * Parse the arguments before setup_revisions(), or something
 623          * like "git format-patch -o a123 HEAD^.." may fail; a123 is
 624          * possibly a valid SHA1.
 625          */
 626         for (i = 1, j = 1; i < argc; i++) {
 627                 if (!strcmp(argv[i], "--stdout"))
 628                         use_stdout = 1;
 629                 else if (!strcmp(argv[i], "-n") ||
 630                                 !strcmp(argv[i], "--numbered"))
 631                         numbered = 1;
 632                 else if (!strcmp(argv[i], "-N") ||
 633                                 !strcmp(argv[i], "--no-numbered")) {
 634                         numbered = 0;
 635                         auto_number = 0;
 636                 }
 637                 else if (!prefixcmp(argv[i], "--start-number="))
 638                         start_number = strtol(argv[i] + 15, NULL, 10);
 639                 else if (!strcmp(argv[i], "--numbered-files"))
 640                         numbered_files = 1;
 641                 else if (!strcmp(argv[i], "--start-number")) {
 642                         i++;
 643                         if (i == argc)
 644                                 die("Need a number for --start-number");
 645                         start_number = strtol(argv[i], NULL, 10);
 646                 }
 647                 else if (!strcmp(argv[i], "-k") ||
 648                                 !strcmp(argv[i], "--keep-subject")) {
 649                         keep_subject = 1;
 650                         rev.total = -1;
 651                 }
 652                 else if (!strcmp(argv[i], "--output-directory") ||
 653                          !strcmp(argv[i], "-o")) {
 654                         i++;
 655                         if (argc <= i)
 656                                 die("Which directory?");
 657                         if (output_directory)
 658                                 die("Two output directories?");
 659                         output_directory = argv[i];
 660                 }
 661                 else if (!strcmp(argv[i], "--signoff") ||
 662                          !strcmp(argv[i], "-s")) {
 663                         const char *committer;
 664                         const char *endpos;
 665                         committer = git_committer_info(IDENT_ERROR_ON_NO_NAME);
 666                         endpos = strchr(committer, '>');
 667                         if (!endpos)
 668                                 die("bogos committer info %s\n", committer);
 669                         add_signoff = xmemdupz(committer, endpos - committer + 1);
 670                 }
 671                 else if (!strcmp(argv[i], "--attach")) {
 672                         rev.mime_boundary = git_version_string;
 673                         rev.no_inline = 1;
 674                 }
 675                 else if (!prefixcmp(argv[i], "--attach=")) {
 676                         rev.mime_boundary = argv[i] + 9;
 677                         rev.no_inline = 1;
 678                 }
 679                 else if (!strcmp(argv[i], "--inline")) {
 680                         rev.mime_boundary = git_version_string;
 681                         rev.no_inline = 0;
 682                 }
 683                 else if (!prefixcmp(argv[i], "--inline=")) {
 684                         rev.mime_boundary = argv[i] + 9;
 685                         rev.no_inline = 0;
 686                 }
 687                 else if (!strcmp(argv[i], "--ignore-if-in-upstream"))
 688                         ignore_if_in_upstream = 1;
 689                 else if (!strcmp(argv[i], "--thread"))
 690                         thread = 1;
 691                 else if (!prefixcmp(argv[i], "--in-reply-to="))
 692                         in_reply_to = argv[i] + 14;
 693                 else if (!strcmp(argv[i], "--in-reply-to")) {
 694                         i++;
 695                         if (i == argc)
 696                                 die("Need a Message-Id for --in-reply-to");
 697                         in_reply_to = argv[i];
 698                 } else if (!prefixcmp(argv[i], "--subject-prefix=")) {
 699                         subject_prefix = 1;
 700                         rev.subject_prefix = argv[i] + 17;
 701                 } else if (!prefixcmp(argv[i], "--suffix="))
 702                         fmt_patch_suffix = argv[i] + 9;
 703                 else
 704                         argv[j++] = argv[i];
 705         }
 706         argc = j;
 707
 708         if (start_number < 0)
 709                 start_number = 1;
 710         if (numbered && keep_subject)
 711                 die ("-n and -k are mutually exclusive.");
 712         if (keep_subject && subject_prefix)
 713                 die ("--subject-prefix and -k are mutually exclusive.");
 714         if (numbered_files && use_stdout)
 715                 die ("--numbered-files and --stdout are mutually exclusive.");
 716
 717         argc = setup_revisions(argc, argv, &rev, "HEAD");
 718         if (argc > 1)
 719                 die ("unrecognized argument: %s", argv[1]);
 720
 721         if (!rev.diffopt.output_format)
 722                 rev.diffopt.output_format = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_SUMMARY | DIFF_FORMAT_PATCH;
 723
 724         if (!DIFF_OPT_TST(&rev.diffopt, TEXT))
 725                 DIFF_OPT_SET(&rev.diffopt, BINARY);
 726
 727         if (!output_directory && !use_stdout)
 728                 output_directory = prefix;
 729
 730         if (output_directory) {
 731                 if (use_stdout)
 732                         die("standard output, or directory, which one?");
 733                 if (mkdir(output_directory, 0777) < 0 && errno != EEXIST)
 734                         die("Could not create directory %s",
 735                             output_directory);
 736         }
 737
 738         if (rev.pending.nr == 1) {
 739                 if (rev.max_count < 0 && !rev.show_root_diff) {
 740                         /*
 741                          * This is traditional behaviour of "git format-patch
 742                          * origin" that prepares what the origin side still
 743                          * does not have.
 744                          */
 745                         rev.pending.objects[0].item->flags |= UNINTERESTING;
 746                         add_head_to_pending(&rev);
 747                 }
 748                 /*
 749                  * Otherwise, it is "format-patch -22 HEAD", and/or
 750                  * "format-patch --root HEAD".  The user wants
 751                  * get_revision() to do the usual traversal.
 752                  */
 753         }
 754
 755         if (ignore_if_in_upstream)
 756                 get_patch_ids(&rev, &ids, prefix);
 757
 758         if (!use_stdout)
 759                 realstdout = xfdopen(xdup(1), "w");
 760
 761         prepare_revision_walk(&rev);
 762         while ((commit = get_revision(&rev)) != NULL) {
 763                 /* ignore merges */
 764                 if (commit->parents && commit->parents->next)
 765                         continue;
 766
 767                 if (ignore_if_in_upstream &&
 768                                 has_commit_patch_id(commit, &ids))
 769                         continue;
 770
 771                 nr++;
 772                 list = xrealloc(list, nr * sizeof(list[0]));
 773                 list[nr - 1] = commit;
 774         }
 775         total = nr;
 776         if (!keep_subject && auto_number && total > 1)
 777                 numbered = 1;
 778         if (numbered)
 779                 rev.total = total + start_number - 1;
 780         rev.add_signoff = add_signoff;
 781         if (in_reply_to)
 782                 rev.ref_message_id = clean_message_id(in_reply_to);
 783         while (0 <= --nr) {
 784                 int shown;
 785                 commit = list[nr];
 786                 rev.nr = total - nr + (start_number - 1);
 787                 /* Make the second and subsequent mails replies to the first */
 788                 if (thread) {
 789                         if (nr == (total - 2)) {
 790                                 strncpy(ref_message_id, message_id,
 791                                         sizeof(ref_message_id));
 792                                 ref_message_id[sizeof(ref_message_id)-1]='\0';
 793                                 rev.ref_message_id = ref_message_id;
 794                         }
 795                         gen_message_id(message_id, sizeof(message_id),
 796                                        sha1_to_hex(commit->object.sha1));
 797                         rev.message_id = message_id;
 798                 }
 799                 if (!use_stdout)
 800                         if (reopen_stdout(commit, rev.nr, keep_subject,
 801                                           numbered_files))
 802                                 die("Failed to create output files");
 803                 shown = log_tree_commit(&rev, commit);
 804                 free(commit->buffer);
 805                 commit->buffer = NULL;
 806
 807                 /* We put one extra blank line between formatted
 808                  * patches and this flag is used by log-tree code
 809                  * to see if it needs to emit a LF before showing
 810                  * the log; when using one file per patch, we do
 811                  * not want the extra blank line.
 812                  */
 813                 if (!use_stdout)
 814                         rev.shown_one = 0;
 815                 if (shown) {
 816                         if (rev.mime_boundary)
 817                                 printf("\n--%s%s--\n\n\n",
 818                                        mime_boundary_leader,
 819                                        rev.mime_boundary);
 820                         else
 821                                 printf("-- \n%s\n\n", git_version_string);
 822                 }
 823                 if (!use_stdout)
 824                         fclose(stdout);
 825         }
 826         free(list);
 827         if (ignore_if_in_upstream)
 828                 free_patch_ids(&ids);
 829         return 0;
 830 }
 831
 832 static int add_pending_commit(const char *arg, struct rev_info *revs, int flags)
 833 {
 834         unsigned char sha1[20];
 835         if (get_sha1(arg, sha1) == 0) {
 836                 struct commit *commit = lookup_commit_reference(sha1);
 837                 if (commit) {
 838                         commit->object.flags |= flags;
 839                         add_pending_object(revs, &commit->object, arg);
 840                         return 0;
 841                 }
 842         }
 843         return -1;
 844 }
 845
 846 static const char cherry_usage[] =
 847 "git-cherry [-v] <upstream> [<head>] [<limit>]";
 848 int cmd_cherry(int argc, const char **argv, const char *prefix)
 849 {
 850         struct rev_info revs;
 851         struct patch_ids ids;
 852         struct commit *commit;
 853         struct commit_list *list = NULL;
 854         const char *upstream;
 855         const char *head = "HEAD";
 856         const char *limit = NULL;
 857         int verbose = 0;
 858
 859         if (argc > 1 && !strcmp(argv[1], "-v")) {
 860                 verbose = 1;
 861                 argc--;
 862                 argv++;
 863         }
 864
 865         switch (argc) {
 866         case 4:
 867                 limit = argv[3];
 868                 /* FALLTHROUGH */
 869         case 3:
 870                 head = argv[2];
 871                 /* FALLTHROUGH */
 872         case 2:
 873                 upstream = argv[1];
 874                 break;
 875         default:
 876                 usage(cherry_usage);
 877         }
 878
 879         init_revisions(&revs, prefix);
 880         revs.diff = 1;
 881         revs.combine_merges = 0;
 882         revs.ignore_merges = 1;
 883         DIFF_OPT_SET(&revs.diffopt, RECURSIVE);
 884
 885         if (add_pending_commit(head, &revs, 0))
 886                 die("Unknown commit %s", head);
 887         if (add_pending_commit(upstream, &revs, UNINTERESTING))
 888                 die("Unknown commit %s", upstream);
 889
 890         /* Don't say anything if head and upstream are the same. */
 891         if (revs.pending.nr == 2) {
 892                 struct object_array_entry *o = revs.pending.objects;
 893                 if (hashcmp(o[0].item->sha1, o[1].item->sha1) == 0)
 894                         return 0;
 895         }
 896
 897         get_patch_ids(&revs, &ids, prefix);
 898
 899         if (limit && add_pending_commit(limit, &revs, UNINTERESTING))
 900                 die("Unknown commit %s", limit);
 901
 902         /* reverse the list of commits */
 903         prepare_revision_walk(&revs);
 904         while ((commit = get_revision(&revs)) != NULL) {
 905                 /* ignore merges */
 906                 if (commit->parents && commit->parents->next)
 907                         continue;
 908
 909                 commit_list_insert(commit, &list);
 910         }
 911
 912         while (list) {
 913                 char sign = '+';
 914
 915                 commit = list->item;
 916                 if (has_commit_patch_id(commit, &ids))
 917                         sign = '-';
 918
 919                 if (verbose) {
 920                         struct strbuf buf;
 921                         strbuf_init(&buf, 0);
 922                         pretty_print_commit(CMIT_FMT_ONELINE, commit,
 923                                             &buf, 0, NULL, NULL, 0, 0);
 924                         printf("%c %s %s\n", sign,
 925                                sha1_to_hex(commit->object.sha1), buf.buf);
 926                         strbuf_release(&buf);
 927                 }
 928                 else {
 929                         printf("%c %s\n", sign,
 930                                sha1_to_hex(commit->object.sha1));
 931                 }
 932
 933                 list = list->next;
 934         }
 935
 936         free_patch_ids(&ids);
 937         return 0;
 938 }