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 "color.h"
   9 #include "commit.h"
  10 #include "diff.h"
  11 #include "revision.h"
  12 #include "log-tree.h"
  13 #include "builtin.h"
  14 #include "tag.h"
  15 #include "reflog-walk.h"
  16 #include "patch-ids.h"
  17 #include "refs.h"
  18
  19 static int default_show_root = 1;
  20 static const char *fmt_patch_subject_prefix = "PATCH";
  21
  22 static void add_name_decoration(const char *prefix, const char *name, struct object *obj)
  23 {
  24         int plen = strlen(prefix);
  25         int nlen = strlen(name);
  26         struct name_decoration *res = xmalloc(sizeof(struct name_decoration) + plen + nlen);
  27         memcpy(res->name, prefix, plen);
  28         memcpy(res->name + plen, name, nlen + 1);
  29         res->next = add_decoration(&name_decoration, obj, res);
  30 }
  31
  32 static int add_ref_decoration(const char *refname, const unsigned char *sha1, int flags, void *cb_data)
  33 {
  34         struct object *obj = parse_object(sha1);
  35         if (!obj)
  36                 return 0;
  37         add_name_decoration("", refname, obj);
  38         while (obj->type == OBJ_TAG) {
  39                 obj = ((struct tag *)obj)->tagged;
  40                 if (!obj)
  41                         break;
  42                 add_name_decoration("tag: ", refname, obj);
  43         }
  44         return 0;
  45 }
  46
  47 static void cmd_log_init(int argc, const char **argv, const char *prefix,
  48                       struct rev_info *rev)
  49 {
  50         int i;
  51         int decorate = 0;
  52
  53         rev->abbrev = DEFAULT_ABBREV;
  54         rev->commit_format = CMIT_FMT_DEFAULT;
  55         rev->verbose_header = 1;
  56         DIFF_OPT_SET(&rev->diffopt, RECURSIVE);
  57         rev->show_root_diff = default_show_root;
  58         rev->subject_prefix = fmt_patch_subject_prefix;
  59         argc = setup_revisions(argc, argv, rev, "HEAD");
  60         if (rev->diffopt.pickaxe || rev->diffopt.filter)
  61                 rev->always_show_header = 0;
  62         if (DIFF_OPT_TST(&rev->diffopt, FOLLOW_RENAMES)) {
  63                 rev->always_show_header = 0;
  64                 if (rev->diffopt.nr_paths != 1)
  65                         usage("git logs can only follow renames on one pathname at a time");
  66         }
  67         for (i = 1; i < argc; i++) {
  68                 const char *arg = argv[i];
  69                 if (!strcmp(arg, "--decorate")) {
  70                         if (!decorate)
  71                                 for_each_ref(add_ref_decoration, NULL);
  72                         decorate = 1;
  73                 } else
  74                         die("unrecognized argument: %s", arg);
  75         }
  76 }
  77
  78 /*
  79  * This gives a rough estimate for how many commits we
  80  * will print out in the list.
  81  */
  82 static int estimate_commit_count(struct rev_info *rev, struct commit_list *list)
  83 {
  84         int n = 0;
  85
  86         while (list) {
  87                 struct commit *commit = list->item;
  88                 unsigned int flags = commit->object.flags;
  89                 list = list->next;
  90                 if (!(flags & (TREESAME | UNINTERESTING)))
  91                         n++;
  92         }
  93         return n;
  94 }
  95
  96 static void show_early_header(struct rev_info *rev, const char *stage, int nr)
  97 {
  98         if (rev->shown_one) {
  99                 rev->shown_one = 0;
 100                 if (rev->commit_format != CMIT_FMT_ONELINE)
 101                         putchar(rev->diffopt.line_termination);
 102         }
 103         printf("Final output: %d %s\n", nr, stage);
 104 }
 105
 106 struct itimerval early_output_timer;
 107
 108 static void log_show_early(struct rev_info *revs, struct commit_list *list)
 109 {
 110         int i = revs->early_output;
 111         int show_header = 1;
 112
 113         sort_in_topological_order(&list, revs->lifo);
 114         while (list && i) {
 115                 struct commit *commit = list->item;
 116                 switch (simplify_commit(revs, commit)) {
 117                 case commit_show:
 118                         if (show_header) {
 119                                 int n = estimate_commit_count(revs, list);
 120                                 show_early_header(revs, "incomplete", n);
 121                                 show_header = 0;
 122                         }
 123                         log_tree_commit(revs, commit);
 124                         i--;
 125                         break;
 126                 case commit_ignore:
 127                         break;
 128                 case commit_error:
 129                         return;
 130                 }
 131                 list = list->next;
 132         }
 133
 134         /* Did we already get enough commits for the early output? */
 135         if (!i)
 136                 return;
 137
 138         /*
 139          * ..if no, then repeat it twice a second until we
 140          * do.
 141          *
 142          * NOTE! We don't use "it_interval", because if the
 143          * reader isn't listening, we want our output to be
 144          * throttled by the writing, and not have the timer
 145          * trigger every second even if we're blocked on a
 146          * reader!
 147          */
 148         early_output_timer.it_value.tv_sec = 0;
 149         early_output_timer.it_value.tv_usec = 500000;
 150         setitimer(ITIMER_REAL, &early_output_timer, NULL);
 151 }
 152
 153 static void early_output(int signal)
 154 {
 155         show_early_output = log_show_early;
 156 }
 157
 158 static void setup_early_output(struct rev_info *rev)
 159 {
 160         struct sigaction sa;
 161
 162         /*
 163          * Set up the signal handler, minimally intrusively:
 164          * we only set a single volatile integer word (not
 165          * using sigatomic_t - trying to avoid unnecessary
 166          * system dependencies and headers), and using
 167          * SA_RESTART.
 168          */
 169         memset(&sa, 0, sizeof(sa));
 170         sa.sa_handler = early_output;
 171         sigemptyset(&sa.sa_mask);
 172         sa.sa_flags = SA_RESTART;
 173         sigaction(SIGALRM, &sa, NULL);
 174
 175         /*
 176          * If we can get the whole output in less than a
 177          * tenth of a second, don't even bother doing the
 178          * early-output thing..
 179          *
 180          * This is a one-time-only trigger.
 181          */
 182         early_output_timer.it_value.tv_sec = 0;
 183         early_output_timer.it_value.tv_usec = 100000;
 184         setitimer(ITIMER_REAL, &early_output_timer, NULL);
 185 }
 186
 187 static void finish_early_output(struct rev_info *rev)
 188 {
 189         int n = estimate_commit_count(rev, rev->commits);
 190         signal(SIGALRM, SIG_IGN);
 191         show_early_header(rev, "done", n);
 192 }
 193
 194 static int cmd_log_walk(struct rev_info *rev)
 195 {
 196         struct commit *commit;
 197
 198         if (rev->early_output)
 199                 setup_early_output(rev);
 200
 201         prepare_revision_walk(rev);
 202
 203         if (rev->early_output)
 204                 finish_early_output(rev);
 205
 206         while ((commit = get_revision(rev)) != NULL) {
 207                 log_tree_commit(rev, commit);
 208                 if (!rev->reflog_info) {
 209                         /* we allow cycles in reflog ancestry */
 210                         free(commit->buffer);
 211                         commit->buffer = NULL;
 212                 }
 213                 free_commit_list(commit->parents);
 214                 commit->parents = NULL;
 215         }
 216         return 0;
 217 }
 218
 219 static int git_log_config(const char *var, const char *value)
 220 {
 221         if (!strcmp(var, "format.subjectprefix")) {
 222                 if (!value)
 223                         config_error_nonbool(var);
 224                 fmt_patch_subject_prefix = xstrdup(value);
 225                 return 0;
 226         }
 227         if (!strcmp(var, "log.showroot")) {
 228                 default_show_root = git_config_bool(var, value);
 229                 return 0;
 230         }
 231         return git_diff_ui_config(var, value);
 232 }
 233
 234 int cmd_whatchanged(int argc, const char **argv, const char *prefix)
 235 {
 236         struct rev_info rev;
 237
 238         git_config(git_log_config);
 239
 240         if (diff_use_color_default == -1)
 241                 diff_use_color_default = git_use_color_default;
 242
 243         init_revisions(&rev, prefix);
 244         rev.diff = 1;
 245         rev.simplify_history = 0;
 246         cmd_log_init(argc, argv, prefix, &rev);
 247         if (!rev.diffopt.output_format)
 248                 rev.diffopt.output_format = DIFF_FORMAT_RAW;
 249         return cmd_log_walk(&rev);
 250 }
 251
 252 static void show_tagger(char *buf, int len, struct rev_info *rev)
 253 {
 254         char *email_end, *p;
 255         unsigned long date;
 256         int tz;
 257
 258         email_end = memchr(buf, '>', len);
 259         if (!email_end)
 260                 return;
 261         p = ++email_end;
 262         while (isspace(*p))
 263                 p++;
 264         date = strtoul(p, &p, 10);
 265         while (isspace(*p))
 266                 p++;
 267         tz = (int)strtol(p, NULL, 10);
 268         printf("Tagger: %.*s\nDate:   %s\n", (int)(email_end - buf), buf,
 269                show_date(date, tz, rev->date_mode));
 270 }
 271
 272 static int show_object(const unsigned char *sha1, int show_tag_object,
 273         struct rev_info *rev)
 274 {
 275         unsigned long size;
 276         enum object_type type;
 277         char *buf = read_sha1_file(sha1, &type, &size);
 278         int offset = 0;
 279
 280         if (!buf)
 281                 return error("Could not read object %s", sha1_to_hex(sha1));
 282
 283         if (show_tag_object)
 284                 while (offset < size && buf[offset] != '\n') {
 285                         int new_offset = offset + 1;
 286                         while (new_offset < size && buf[new_offset++] != '\n')
 287                                 ; /* do nothing */
 288                         if (!prefixcmp(buf + offset, "tagger "))
 289                                 show_tagger(buf + offset + 7,
 290                                             new_offset - offset - 7, rev);
 291                         offset = new_offset;
 292                 }
 293
 294         if (offset < size)
 295                 fwrite(buf + offset, size - offset, 1, stdout);
 296         free(buf);
 297         return 0;
 298 }
 299
 300 static int show_tree_object(const unsigned char *sha1,
 301                 const char *base, int baselen,
 302                 const char *pathname, unsigned mode, int stage)
 303 {
 304         printf("%s%s\n", pathname, S_ISDIR(mode) ? "/" : "");
 305         return 0;
 306 }
 307
 308 int cmd_show(int argc, const char **argv, const char *prefix)
 309 {
 310         struct rev_info rev;
 311         struct object_array_entry *objects;
 312         int i, count, ret = 0;
 313
 314         git_config(git_log_config);
 315
 316         if (diff_use_color_default == -1)
 317                 diff_use_color_default = git_use_color_default;
 318
 319         init_revisions(&rev, prefix);
 320         rev.diff = 1;
 321         rev.combine_merges = 1;
 322         rev.dense_combined_merges = 1;
 323         rev.always_show_header = 1;
 324         rev.ignore_merges = 0;
 325         rev.no_walk = 1;
 326         cmd_log_init(argc, argv, prefix, &rev);
 327
 328         count = rev.pending.nr;
 329         objects = rev.pending.objects;
 330         for (i = 0; i < count && !ret; i++) {
 331                 struct object *o = objects[i].item;
 332                 const char *name = objects[i].name;
 333                 switch (o->type) {
 334                 case OBJ_BLOB:
 335                         ret = show_object(o->sha1, 0, NULL);
 336                         break;
 337                 case OBJ_TAG: {
 338                         struct tag *t = (struct tag *)o;
 339
 340                         printf("%stag %s%s\n",
 341                                         diff_get_color_opt(&rev.diffopt, DIFF_COMMIT),
 342                                         t->tag,
 343                                         diff_get_color_opt(&rev.diffopt, DIFF_RESET));
 344                         ret = show_object(o->sha1, 1, &rev);
 345                         objects[i].item = (struct object *)t->tagged;
 346                         i--;
 347                         break;
 348                 }
 349                 case OBJ_TREE:
 350                         printf("%stree %s%s\n\n",
 351                                         diff_get_color_opt(&rev.diffopt, DIFF_COMMIT),
 352                                         name,
 353                                         diff_get_color_opt(&rev.diffopt, DIFF_RESET));
 354                         read_tree_recursive((struct tree *)o, "", 0, 0, NULL,
 355                                         show_tree_object);
 356                         break;
 357                 case OBJ_COMMIT:
 358                         rev.pending.nr = rev.pending.alloc = 0;
 359                         rev.pending.objects = NULL;
 360                         add_object_array(o, name, &rev.pending);
 361                         ret = cmd_log_walk(&rev);
 362                         break;
 363                 default:
 364                         ret = error("Unknown type: %d", o->type);
 365                 }
 366         }
 367         free(objects);
 368         return ret;
 369 }
 370
 371 /*
 372  * This is equivalent to "git log -g --abbrev-commit --pretty=oneline"
 373  */
 374 int cmd_log_reflog(int argc, const char **argv, const char *prefix)
 375 {
 376         struct rev_info rev;
 377
 378         git_config(git_log_config);
 379
 380         if (diff_use_color_default == -1)
 381                 diff_use_color_default = git_use_color_default;
 382
 383         init_revisions(&rev, prefix);
 384         init_reflog_walk(&rev.reflog_info);
 385         rev.abbrev_commit = 1;
 386         rev.verbose_header = 1;
 387         cmd_log_init(argc, argv, prefix, &rev);
 388
 389         /*
 390          * This means that we override whatever commit format the user gave
 391          * on the cmd line.  Sad, but cmd_log_init() currently doesn't
 392          * allow us to set a different default.
 393          */
 394         rev.commit_format = CMIT_FMT_ONELINE;
 395         rev.always_show_header = 1;
 396
 397         /*
 398          * We get called through "git reflog", so unlike the other log
 399          * routines, we need to set up our pager manually..
 400          */
 401         setup_pager();
 402
 403         return cmd_log_walk(&rev);
 404 }
 405
 406 int cmd_log(int argc, const char **argv, const char *prefix)
 407 {
 408         struct rev_info rev;
 409
 410         git_config(git_log_config);
 411
 412         if (diff_use_color_default == -1)
 413                 diff_use_color_default = git_use_color_default;
 414
 415         init_revisions(&rev, prefix);
 416         rev.always_show_header = 1;
 417         cmd_log_init(argc, argv, prefix, &rev);
 418         return cmd_log_walk(&rev);
 419 }
 420
 421 /* format-patch */
 422 #define FORMAT_PATCH_NAME_MAX 64
 423
 424 static int istitlechar(char c)
 425 {
 426         return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') ||
 427                 (c >= '0' && c <= '9') || c == '.' || c == '_';
 428 }
 429
 430 static char *extra_headers = NULL;
 431 static int extra_headers_size = 0;
 432 static const char *fmt_patch_suffix = ".patch";
 433 static int numbered = 0;
 434 static int auto_number = 0;
 435
 436 static int git_format_config(const char *var, const char *value)
 437 {
 438         if (!strcmp(var, "format.headers")) {
 439                 int len;
 440
 441                 if (!value)
 442                         die("format.headers without value");
 443                 len = strlen(value);
 444                 extra_headers_size += len + 1;
 445                 extra_headers = xrealloc(extra_headers, extra_headers_size);
 446                 extra_headers[extra_headers_size - len - 1] = 0;
 447                 strcat(extra_headers, value);
 448                 return 0;
 449         }
 450         if (!strcmp(var, "format.suffix")) {
 451                 if (!value)
 452                         return config_error_nonbool(var);
 453                 fmt_patch_suffix = xstrdup(value);
 454                 return 0;
 455         }
 456         if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
 457                 return 0;
 458         }
 459         if (!strcmp(var, "format.numbered")) {
 460                 if (value && !strcasecmp(value, "auto")) {
 461                         auto_number = 1;
 462                         return 0;
 463                 }
 464                 numbered = git_config_bool(var, value);
 465                 return 0;
 466         }
 467
 468         return git_log_config(var, value);
 469 }
 470
 471
 472 static FILE *realstdout = NULL;
 473 static const char *output_directory = NULL;
 474
 475 static int reopen_stdout(struct commit *commit, int nr, int keep_subject,
 476                          int numbered_files)
 477 {
 478         char filename[PATH_MAX];
 479         char *sol;
 480         int len = 0;
 481         int suffix_len = strlen(fmt_patch_suffix) + 1;
 482
 483         if (output_directory) {
 484                 if (strlen(output_directory) >=
 485                     sizeof(filename) - FORMAT_PATCH_NAME_MAX - suffix_len)
 486                         return error("name of output directory is too long");
 487                 strlcpy(filename, output_directory, sizeof(filename) - suffix_len);
 488                 len = strlen(filename);
 489                 if (filename[len - 1] != '/')
 490                         filename[len++] = '/';
 491         }
 492
 493         if (numbered_files) {
 494                 sprintf(filename + len, "%d", nr);
 495                 len = strlen(filename);
 496
 497         } else {
 498                 sprintf(filename + len, "%04d", nr);
 499                 len = strlen(filename);
 500
 501                 sol = strstr(commit->buffer, "\n\n");
 502                 if (sol) {
 503                         int j, space = 1;
 504
 505                         sol += 2;
 506                         /* strip [PATCH] or [PATCH blabla] */
 507                         if (!keep_subject && !prefixcmp(sol, "[PATCH")) {
 508                                 char *eos = strchr(sol + 6, ']');
 509                                 if (eos) {
 510                                         while (isspace(*eos))
 511                                                 eos++;
 512                                         sol = eos;
 513                                 }
 514                         }
 515
 516                         for (j = 0;
 517                              j < FORMAT_PATCH_NAME_MAX - suffix_len - 5 &&
 518                                      len < sizeof(filename) - suffix_len &&
 519                                      sol[j] && sol[j] != '\n';
 520                              j++) {
 521                                 if (istitlechar(sol[j])) {
 522                                         if (space) {
 523                                                 filename[len++] = '-';
 524                                                 space = 0;
 525                                         }
 526                                         filename[len++] = sol[j];
 527                                         if (sol[j] == '.')
 528                                                 while (sol[j + 1] == '.')
 529                                                         j++;
 530                                 } else
 531                                         space = 1;
 532                         }
 533                         while (filename[len - 1] == '.'
 534                                || filename[len - 1] == '-')
 535                                 len--;
 536                         filename[len] = 0;
 537                 }
 538                 if (len + suffix_len >= sizeof(filename))
 539                         return error("Patch pathname too long");
 540                 strcpy(filename + len, fmt_patch_suffix);
 541         }
 542
 543         fprintf(realstdout, "%s\n", filename);
 544         if (freopen(filename, "w", stdout) == NULL)
 545                 return error("Cannot open patch file %s",filename);
 546
 547         return 0;
 548 }
 549
 550 static void get_patch_ids(struct rev_info *rev, struct patch_ids *ids, const char *prefix)
 551 {
 552         struct rev_info check_rev;
 553         struct commit *commit;
 554         struct object *o1, *o2;
 555         unsigned flags1, flags2;
 556
 557         if (rev->pending.nr != 2)
 558                 die("Need exactly one range.");
 559
 560         o1 = rev->pending.objects[0].item;
 561         flags1 = o1->flags;
 562         o2 = rev->pending.objects[1].item;
 563         flags2 = o2->flags;
 564
 565         if ((flags1 & UNINTERESTING) == (flags2 & UNINTERESTING))
 566                 die("Not a range.");
 567
 568         init_patch_ids(ids);
 569
 570         /* given a range a..b get all patch ids for b..a */
 571         init_revisions(&check_rev, prefix);
 572         o1->flags ^= UNINTERESTING;
 573         o2->flags ^= UNINTERESTING;
 574         add_pending_object(&check_rev, o1, "o1");
 575         add_pending_object(&check_rev, o2, "o2");
 576         prepare_revision_walk(&check_rev);
 577
 578         while ((commit = get_revision(&check_rev)) != NULL) {
 579                 /* ignore merges */
 580                 if (commit->parents && commit->parents->next)
 581                         continue;
 582
 583                 add_commit_patch_id(commit, ids);
 584         }
 585
 586         /* reset for next revision walk */
 587         clear_commit_marks((struct commit *)o1,
 588                         SEEN | UNINTERESTING | SHOWN | ADDED);
 589         clear_commit_marks((struct commit *)o2,
 590                         SEEN | UNINTERESTING | SHOWN | ADDED);
 591         o1->flags = flags1;
 592         o2->flags = flags2;
 593 }
 594
 595 static void gen_message_id(char *dest, unsigned int length, char *base)
 596 {
 597         const char *committer = git_committer_info(IDENT_WARN_ON_NO_NAME);
 598         const char *email_start = strrchr(committer, '<');
 599         const char *email_end = strrchr(committer, '>');
 600         if(!email_start || !email_end || email_start > email_end - 1)
 601                 die("Could not extract email from committer identity.");
 602         snprintf(dest, length, "%s.%lu.git.%.*s", base,
 603                  (unsigned long) time(NULL),
 604                  (int)(email_end - email_start - 1), email_start + 1);
 605 }
 606
 607 static const char *clean_message_id(const char *msg_id)
 608 {
 609         char ch;
 610         const char *a, *z, *m;
 611
 612         m = msg_id;
 613         while ((ch = *m) && (isspace(ch) || (ch == '<')))
 614                 m++;
 615         a = m;
 616         z = NULL;
 617         while ((ch = *m)) {
 618                 if (!isspace(ch) && (ch != '>'))
 619                         z = m;
 620                 m++;
 621         }
 622         if (!z)
 623                 die("insane in-reply-to: %s", msg_id);
 624         if (++z == m)
 625                 return a;
 626         return xmemdupz(a, z - a);
 627 }
 628
 629 int cmd_format_patch(int argc, const char **argv, const char *prefix)
 630 {
 631         struct commit *commit;
 632         struct commit **list = NULL;
 633         struct rev_info rev;
 634         int nr = 0, total, i, j;
 635         int use_stdout = 0;
 636         int start_number = -1;
 637         int keep_subject = 0;
 638         int numbered_files = 0;         /* _just_ numbers */
 639         int subject_prefix = 0;
 640         int ignore_if_in_upstream = 0;
 641         int thread = 0;
 642         const char *in_reply_to = NULL;
 643         struct patch_ids ids;
 644         char *add_signoff = NULL;
 645         char message_id[1024];
 646         char ref_message_id[1024];
 647
 648         git_config(git_format_config);
 649         init_revisions(&rev, prefix);
 650         rev.commit_format = CMIT_FMT_EMAIL;
 651         rev.verbose_header = 1;
 652         rev.diff = 1;
 653         rev.combine_merges = 0;
 654         rev.ignore_merges = 1;
 655         rev.diffopt.msg_sep = "";
 656         DIFF_OPT_SET(&rev.diffopt, RECURSIVE);
 657
 658         rev.subject_prefix = fmt_patch_subject_prefix;
 659         rev.extra_headers = extra_headers;
 660
 661         /*
 662          * Parse the arguments before setup_revisions(), or something
 663          * like "git format-patch -o a123 HEAD^.." may fail; a123 is
 664          * possibly a valid SHA1.
 665          */
 666         for (i = 1, j = 1; i < argc; i++) {
 667                 if (!strcmp(argv[i], "--stdout"))
 668                         use_stdout = 1;
 669                 else if (!strcmp(argv[i], "-n") ||
 670                                 !strcmp(argv[i], "--numbered"))
 671                         numbered = 1;
 672                 else if (!strcmp(argv[i], "-N") ||
 673                                 !strcmp(argv[i], "--no-numbered")) {
 674                         numbered = 0;
 675                         auto_number = 0;
 676                 }
 677                 else if (!prefixcmp(argv[i], "--start-number="))
 678                         start_number = strtol(argv[i] + 15, NULL, 10);
 679                 else if (!strcmp(argv[i], "--numbered-files"))
 680                         numbered_files = 1;
 681                 else if (!strcmp(argv[i], "--start-number")) {
 682                         i++;
 683                         if (i == argc)
 684                                 die("Need a number for --start-number");
 685                         start_number = strtol(argv[i], NULL, 10);
 686                 }
 687                 else if (!strcmp(argv[i], "-k") ||
 688                                 !strcmp(argv[i], "--keep-subject")) {
 689                         keep_subject = 1;
 690                         rev.total = -1;
 691                 }
 692                 else if (!strcmp(argv[i], "--output-directory") ||
 693                          !strcmp(argv[i], "-o")) {
 694                         i++;
 695                         if (argc <= i)
 696                                 die("Which directory?");
 697                         if (output_directory)
 698                                 die("Two output directories?");
 699                         output_directory = argv[i];
 700                 }
 701                 else if (!strcmp(argv[i], "--signoff") ||
 702                          !strcmp(argv[i], "-s")) {
 703                         const char *committer;
 704                         const char *endpos;
 705                         committer = git_committer_info(IDENT_ERROR_ON_NO_NAME);
 706                         endpos = strchr(committer, '>');
 707                         if (!endpos)
 708                                 die("bogos committer info %s\n", committer);
 709                         add_signoff = xmemdupz(committer, endpos - committer + 1);
 710                 }
 711                 else if (!strcmp(argv[i], "--attach")) {
 712                         rev.mime_boundary = git_version_string;
 713                         rev.no_inline = 1;
 714                 }
 715                 else if (!prefixcmp(argv[i], "--attach=")) {
 716                         rev.mime_boundary = argv[i] + 9;
 717                         rev.no_inline = 1;
 718                 }
 719                 else if (!strcmp(argv[i], "--inline")) {
 720                         rev.mime_boundary = git_version_string;
 721                         rev.no_inline = 0;
 722                 }
 723                 else if (!prefixcmp(argv[i], "--inline=")) {
 724                         rev.mime_boundary = argv[i] + 9;
 725                         rev.no_inline = 0;
 726                 }
 727                 else if (!strcmp(argv[i], "--ignore-if-in-upstream"))
 728                         ignore_if_in_upstream = 1;
 729                 else if (!strcmp(argv[i], "--thread"))
 730                         thread = 1;
 731                 else if (!prefixcmp(argv[i], "--in-reply-to="))
 732                         in_reply_to = argv[i] + 14;
 733                 else if (!strcmp(argv[i], "--in-reply-to")) {
 734                         i++;
 735                         if (i == argc)
 736                                 die("Need a Message-Id for --in-reply-to");
 737                         in_reply_to = argv[i];
 738                 } else if (!prefixcmp(argv[i], "--subject-prefix=")) {
 739                         subject_prefix = 1;
 740                         rev.subject_prefix = argv[i] + 17;
 741                 } else if (!prefixcmp(argv[i], "--suffix="))
 742                         fmt_patch_suffix = argv[i] + 9;
 743                 else
 744                         argv[j++] = argv[i];
 745         }
 746         argc = j;
 747
 748         if (start_number < 0)
 749                 start_number = 1;
 750         if (numbered && keep_subject)
 751                 die ("-n and -k are mutually exclusive.");
 752         if (keep_subject && subject_prefix)
 753                 die ("--subject-prefix and -k are mutually exclusive.");
 754         if (numbered_files && use_stdout)
 755                 die ("--numbered-files and --stdout are mutually exclusive.");
 756
 757         argc = setup_revisions(argc, argv, &rev, "HEAD");
 758         if (argc > 1)
 759                 die ("unrecognized argument: %s", argv[1]);
 760
 761         if (!rev.diffopt.output_format)
 762                 rev.diffopt.output_format = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_SUMMARY | DIFF_FORMAT_PATCH;
 763
 764         if (!DIFF_OPT_TST(&rev.diffopt, TEXT))
 765                 DIFF_OPT_SET(&rev.diffopt, BINARY);
 766
 767         if (!output_directory && !use_stdout)
 768                 output_directory = prefix;
 769
 770         if (output_directory) {
 771                 if (use_stdout)
 772                         die("standard output, or directory, which one?");
 773                 if (mkdir(output_directory, 0777) < 0 && errno != EEXIST)
 774                         die("Could not create directory %s",
 775                             output_directory);
 776         }
 777
 778         if (rev.pending.nr == 1) {
 779                 if (rev.max_count < 0 && !rev.show_root_diff) {
 780                         /*
 781                          * This is traditional behaviour of "git format-patch
 782                          * origin" that prepares what the origin side still
 783                          * does not have.
 784                          */
 785                         rev.pending.objects[0].item->flags |= UNINTERESTING;
 786                         add_head_to_pending(&rev);
 787                 }
 788                 /*
 789                  * Otherwise, it is "format-patch -22 HEAD", and/or
 790                  * "format-patch --root HEAD".  The user wants
 791                  * get_revision() to do the usual traversal.
 792                  */
 793         }
 794
 795         if (ignore_if_in_upstream)
 796                 get_patch_ids(&rev, &ids, prefix);
 797
 798         if (!use_stdout)
 799                 realstdout = xfdopen(xdup(1), "w");
 800
 801         prepare_revision_walk(&rev);
 802         while ((commit = get_revision(&rev)) != NULL) {
 803                 /* ignore merges */
 804                 if (commit->parents && commit->parents->next)
 805                         continue;
 806
 807                 if (ignore_if_in_upstream &&
 808                                 has_commit_patch_id(commit, &ids))
 809                         continue;
 810
 811                 nr++;
 812                 list = xrealloc(list, nr * sizeof(list[0]));
 813                 list[nr - 1] = commit;
 814         }
 815         total = nr;
 816         if (!keep_subject && auto_number && total > 1)
 817                 numbered = 1;
 818         if (numbered)
 819                 rev.total = total + start_number - 1;
 820         rev.add_signoff = add_signoff;
 821         if (in_reply_to)
 822                 rev.ref_message_id = clean_message_id(in_reply_to);
 823         while (0 <= --nr) {
 824                 int shown;
 825                 commit = list[nr];
 826                 rev.nr = total - nr + (start_number - 1);
 827                 /* Make the second and subsequent mails replies to the first */
 828                 if (thread) {
 829                         if (nr == (total - 2)) {
 830                                 strncpy(ref_message_id, message_id,
 831                                         sizeof(ref_message_id));
 832                                 ref_message_id[sizeof(ref_message_id)-1]='\0';
 833                                 rev.ref_message_id = ref_message_id;
 834                         }
 835                         gen_message_id(message_id, sizeof(message_id),
 836                                        sha1_to_hex(commit->object.sha1));
 837                         rev.message_id = message_id;
 838                 }
 839                 if (!use_stdout)
 840                         if (reopen_stdout(commit, rev.nr, keep_subject,
 841                                           numbered_files))
 842                                 die("Failed to create output files");
 843                 shown = log_tree_commit(&rev, commit);
 844                 free(commit->buffer);
 845                 commit->buffer = NULL;
 846
 847                 /* We put one extra blank line between formatted
 848                  * patches and this flag is used by log-tree code
 849                  * to see if it needs to emit a LF before showing
 850                  * the log; when using one file per patch, we do
 851                  * not want the extra blank line.
 852                  */
 853                 if (!use_stdout)
 854                         rev.shown_one = 0;
 855                 if (shown) {
 856                         if (rev.mime_boundary)
 857                                 printf("\n--%s%s--\n\n\n",
 858                                        mime_boundary_leader,
 859                                        rev.mime_boundary);
 860                         else
 861                                 printf("-- \n%s\n\n", git_version_string);
 862                 }
 863                 if (!use_stdout)
 864                         fclose(stdout);
 865         }
 866         free(list);
 867         if (ignore_if_in_upstream)
 868                 free_patch_ids(&ids);
 869         return 0;
 870 }
 871
 872 static int add_pending_commit(const char *arg, struct rev_info *revs, int flags)
 873 {
 874         unsigned char sha1[20];
 875         if (get_sha1(arg, sha1) == 0) {
 876                 struct commit *commit = lookup_commit_reference(sha1);
 877                 if (commit) {
 878                         commit->object.flags |= flags;
 879                         add_pending_object(revs, &commit->object, arg);
 880                         return 0;
 881                 }
 882         }
 883         return -1;
 884 }
 885
 886 static const char cherry_usage[] =
 887 "git-cherry [-v] <upstream> [<head>] [<limit>]";
 888 int cmd_cherry(int argc, const char **argv, const char *prefix)
 889 {
 890         struct rev_info revs;
 891         struct patch_ids ids;
 892         struct commit *commit;
 893         struct commit_list *list = NULL;
 894         const char *upstream;
 895         const char *head = "HEAD";
 896         const char *limit = NULL;
 897         int verbose = 0;
 898
 899         if (argc > 1 && !strcmp(argv[1], "-v")) {
 900                 verbose = 1;
 901                 argc--;
 902                 argv++;
 903         }
 904
 905         switch (argc) {
 906         case 4:
 907                 limit = argv[3];
 908                 /* FALLTHROUGH */
 909         case 3:
 910                 head = argv[2];
 911                 /* FALLTHROUGH */
 912         case 2:
 913                 upstream = argv[1];
 914                 break;
 915         default:
 916                 usage(cherry_usage);
 917         }
 918
 919         init_revisions(&revs, prefix);
 920         revs.diff = 1;
 921         revs.combine_merges = 0;
 922         revs.ignore_merges = 1;
 923         DIFF_OPT_SET(&revs.diffopt, RECURSIVE);
 924
 925         if (add_pending_commit(head, &revs, 0))
 926                 die("Unknown commit %s", head);
 927         if (add_pending_commit(upstream, &revs, UNINTERESTING))
 928                 die("Unknown commit %s", upstream);
 929
 930         /* Don't say anything if head and upstream are the same. */
 931         if (revs.pending.nr == 2) {
 932                 struct object_array_entry *o = revs.pending.objects;
 933                 if (hashcmp(o[0].item->sha1, o[1].item->sha1) == 0)
 934                         return 0;
 935         }
 936
 937         get_patch_ids(&revs, &ids, prefix);
 938
 939         if (limit && add_pending_commit(limit, &revs, UNINTERESTING))
 940                 die("Unknown commit %s", limit);
 941
 942         /* reverse the list of commits */
 943         prepare_revision_walk(&revs);
 944         while ((commit = get_revision(&revs)) != NULL) {
 945                 /* ignore merges */
 946                 if (commit->parents && commit->parents->next)
 947                         continue;
 948
 949                 commit_list_insert(commit, &list);
 950         }
 951
 952         while (list) {
 953                 char sign = '+';
 954
 955                 commit = list->item;
 956                 if (has_commit_patch_id(commit, &ids))
 957                         sign = '-';
 958
 959                 if (verbose) {
 960                         struct strbuf buf;
 961                         strbuf_init(&buf, 0);
 962                         pretty_print_commit(CMIT_FMT_ONELINE, commit,
 963                                             &buf, 0, NULL, NULL, 0, 0);
 964                         printf("%c %s %s\n", sign,
 965                                sha1_to_hex(commit->object.sha1), buf.buf);
 966                         strbuf_release(&buf);
 967                 }
 968                 else {
 969                         printf("%c %s\n", sign,
 970                                sha1_to_hex(commit->object.sha1));
 971                 }
 972
 973                 list = list->next;
 974         }
 975
 976         free_patch_ids(&ids);
 977         return 0;
 978 }