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 "run-command.h"
  18 #include "shortlog.h"
  19 #include "remote.h"
  20 #include "string-list.h"
  21 #include "parse-options.h"
  22
  23 /* Set a default date-time format for git log ("log.date" config variable) */
  24 static const char *default_date_mode = NULL;
  25
  26 static int default_show_root = 1;
  27 static const char *fmt_patch_subject_prefix = "PATCH";
  28 static const char *fmt_pretty;
  29
  30 static const char * const builtin_log_usage =
  31         "git log [<options>] [<since>..<until>] [[--] <path>...]\n"
  32         "   or: git show [options] <object>...";
  33
  34 static void cmd_log_init(int argc, const char **argv, const char *prefix,
  35                          struct rev_info *rev, struct setup_revision_opt *opt)
  36 {
  37         int i;
  38         int decoration_style = 0;
  39
  40         rev->abbrev = DEFAULT_ABBREV;
  41         rev->commit_format = CMIT_FMT_DEFAULT;
  42         if (fmt_pretty)
  43                 get_commit_format(fmt_pretty, rev);
  44         rev->verbose_header = 1;
  45         DIFF_OPT_SET(&rev->diffopt, RECURSIVE);
  46         rev->show_root_diff = default_show_root;
  47         rev->subject_prefix = fmt_patch_subject_prefix;
  48         DIFF_OPT_SET(&rev->diffopt, ALLOW_TEXTCONV);
  49
  50         if (default_date_mode)
  51                 rev->date_mode = parse_date_format(default_date_mode);
  52
  53         /*
  54          * Check for -h before setup_revisions(), or "git log -h" will
  55          * fail when run without a git directory.
  56          */
  57         if (argc == 2 && !strcmp(argv[1], "-h"))
  58                 usage(builtin_log_usage);
  59         argc = setup_revisions(argc, argv, rev, opt);
  60
  61         if (!rev->show_notes_given && !rev->pretty_given)
  62                 rev->show_notes = 1;
  63         if (rev->show_notes)
  64                 init_display_notes(&rev->notes_opt);
  65
  66         if (rev->diffopt.pickaxe || rev->diffopt.filter)
  67                 rev->always_show_header = 0;
  68         if (DIFF_OPT_TST(&rev->diffopt, FOLLOW_RENAMES)) {
  69                 rev->always_show_header = 0;
  70                 if (rev->diffopt.nr_paths != 1)
  71                         usage("git logs can only follow renames on one pathname at a time");
  72         }
  73         for (i = 1; i < argc; i++) {
  74                 const char *arg = argv[i];
  75                 if (!strcmp(arg, "--decorate")) {
  76                         decoration_style = DECORATE_SHORT_REFS;
  77                 } else if (!prefixcmp(arg, "--decorate=")) {
  78                         const char *v = skip_prefix(arg, "--decorate=");
  79                         if (!strcmp(v, "full"))
  80                                 decoration_style = DECORATE_FULL_REFS;
  81                         else if (!strcmp(v, "short"))
  82                                 decoration_style = DECORATE_SHORT_REFS;
  83                         else
  84                                 die("invalid --decorate option: %s", arg);
  85                 } else if (!strcmp(arg, "--source")) {
  86                         rev->show_source = 1;
  87                 } else if (!strcmp(arg, "-h")) {
  88                         usage(builtin_log_usage);
  89                 } else
  90                         die("unrecognized argument: %s", arg);
  91         }
  92         if (decoration_style) {
  93                 rev->show_decorations = 1;
  94                 load_ref_decorations(decoration_style);
  95         }
  96 }
  97
  98 /*
  99  * This gives a rough estimate for how many commits we
 100  * will print out in the list.
 101  */
 102 static int estimate_commit_count(struct rev_info *rev, struct commit_list *list)
 103 {
 104         int n = 0;
 105
 106         while (list) {
 107                 struct commit *commit = list->item;
 108                 unsigned int flags = commit->object.flags;
 109                 list = list->next;
 110                 if (!(flags & (TREESAME | UNINTERESTING)))
 111                         n++;
 112         }
 113         return n;
 114 }
 115
 116 static void show_early_header(struct rev_info *rev, const char *stage, int nr)
 117 {
 118         if (rev->shown_one) {
 119                 rev->shown_one = 0;
 120                 if (rev->commit_format != CMIT_FMT_ONELINE)
 121                         putchar(rev->diffopt.line_termination);
 122         }
 123         printf("Final output: %d %s\n", nr, stage);
 124 }
 125
 126 static struct itimerval early_output_timer;
 127
 128 static void log_show_early(struct rev_info *revs, struct commit_list *list)
 129 {
 130         int i = revs->early_output;
 131         int show_header = 1;
 132
 133         sort_in_topological_order(&list, revs->lifo);
 134         while (list && i) {
 135                 struct commit *commit = list->item;
 136                 switch (simplify_commit(revs, commit)) {
 137                 case commit_show:
 138                         if (show_header) {
 139                                 int n = estimate_commit_count(revs, list);
 140                                 show_early_header(revs, "incomplete", n);
 141                                 show_header = 0;
 142                         }
 143                         log_tree_commit(revs, commit);
 144                         i--;
 145                         break;
 146                 case commit_ignore:
 147                         break;
 148                 case commit_error:
 149                         return;
 150                 }
 151                 list = list->next;
 152         }
 153
 154         /* Did we already get enough commits for the early output? */
 155         if (!i)
 156                 return;
 157
 158         /*
 159          * ..if no, then repeat it twice a second until we
 160          * do.
 161          *
 162          * NOTE! We don't use "it_interval", because if the
 163          * reader isn't listening, we want our output to be
 164          * throttled by the writing, and not have the timer
 165          * trigger every second even if we're blocked on a
 166          * reader!
 167          */
 168         early_output_timer.it_value.tv_sec = 0;
 169         early_output_timer.it_value.tv_usec = 500000;
 170         setitimer(ITIMER_REAL, &early_output_timer, NULL);
 171 }
 172
 173 static void early_output(int signal)
 174 {
 175         show_early_output = log_show_early;
 176 }
 177
 178 static void setup_early_output(struct rev_info *rev)
 179 {
 180         struct sigaction sa;
 181
 182         /*
 183          * Set up the signal handler, minimally intrusively:
 184          * we only set a single volatile integer word (not
 185          * using sigatomic_t - trying to avoid unnecessary
 186          * system dependencies and headers), and using
 187          * SA_RESTART.
 188          */
 189         memset(&sa, 0, sizeof(sa));
 190         sa.sa_handler = early_output;
 191         sigemptyset(&sa.sa_mask);
 192         sa.sa_flags = SA_RESTART;
 193         sigaction(SIGALRM, &sa, NULL);
 194
 195         /*
 196          * If we can get the whole output in less than a
 197          * tenth of a second, don't even bother doing the
 198          * early-output thing..
 199          *
 200          * This is a one-time-only trigger.
 201          */
 202         early_output_timer.it_value.tv_sec = 0;
 203         early_output_timer.it_value.tv_usec = 100000;
 204         setitimer(ITIMER_REAL, &early_output_timer, NULL);
 205 }
 206
 207 static void finish_early_output(struct rev_info *rev)
 208 {
 209         int n = estimate_commit_count(rev, rev->commits);
 210         signal(SIGALRM, SIG_IGN);
 211         show_early_header(rev, "done", n);
 212 }
 213
 214 static int cmd_log_walk(struct rev_info *rev)
 215 {
 216         struct commit *commit;
 217
 218         if (rev->early_output)
 219                 setup_early_output(rev);
 220
 221         if (prepare_revision_walk(rev))
 222                 die("revision walk setup failed");
 223
 224         if (rev->early_output)
 225                 finish_early_output(rev);
 226
 227         /*
 228          * For --check and --exit-code, the exit code is based on CHECK_FAILED
 229          * and HAS_CHANGES being accumulated in rev->diffopt, so be careful to
 230          * retain that state information if replacing rev->diffopt in this loop
 231          */
 232         while ((commit = get_revision(rev)) != NULL) {
 233                 log_tree_commit(rev, commit);
 234                 if (!rev->reflog_info) {
 235                         /* we allow cycles in reflog ancestry */
 236                         free(commit->buffer);
 237                         commit->buffer = NULL;
 238                 }
 239                 free_commit_list(commit->parents);
 240                 commit->parents = NULL;
 241         }
 242         if (rev->diffopt.output_format & DIFF_FORMAT_CHECKDIFF &&
 243             DIFF_OPT_TST(&rev->diffopt, CHECK_FAILED)) {
 244                 return 02;
 245         }
 246         return diff_result_code(&rev->diffopt, 0);
 247 }
 248
 249 static int git_log_config(const char *var, const char *value, void *cb)
 250 {
 251         if (!strcmp(var, "format.pretty"))
 252                 return git_config_string(&fmt_pretty, var, value);
 253         if (!strcmp(var, "format.subjectprefix"))
 254                 return git_config_string(&fmt_patch_subject_prefix, var, value);
 255         if (!strcmp(var, "log.date"))
 256                 return git_config_string(&default_date_mode, var, value);
 257         if (!strcmp(var, "log.showroot")) {
 258                 default_show_root = git_config_bool(var, value);
 259                 return 0;
 260         }
 261         return git_diff_ui_config(var, value, cb);
 262 }
 263
 264 int cmd_whatchanged(int argc, const char **argv, const char *prefix)
 265 {
 266         struct rev_info rev;
 267         struct setup_revision_opt opt;
 268
 269         git_config(git_log_config, NULL);
 270
 271         if (diff_use_color_default == -1)
 272                 diff_use_color_default = git_use_color_default;
 273
 274         init_revisions(&rev, prefix);
 275         rev.diff = 1;
 276         rev.simplify_history = 0;
 277         memset(&opt, 0, sizeof(opt));
 278         opt.def = "HEAD";
 279         cmd_log_init(argc, argv, prefix, &rev, &opt);
 280         if (!rev.diffopt.output_format)
 281                 rev.diffopt.output_format = DIFF_FORMAT_RAW;
 282         return cmd_log_walk(&rev);
 283 }
 284
 285 static void show_tagger(char *buf, int len, struct rev_info *rev)
 286 {
 287         struct strbuf out = STRBUF_INIT;
 288
 289         pp_user_info("Tagger", rev->commit_format, &out, buf, rev->date_mode,
 290                 git_log_output_encoding ?
 291                 git_log_output_encoding: git_commit_encoding);
 292         printf("%s", out.buf);
 293         strbuf_release(&out);
 294 }
 295
 296 static int show_object(const unsigned char *sha1, int show_tag_object,
 297         struct rev_info *rev)
 298 {
 299         unsigned long size;
 300         enum object_type type;
 301         char *buf = read_sha1_file(sha1, &type, &size);
 302         int offset = 0;
 303
 304         if (!buf)
 305                 return error("Could not read object %s", sha1_to_hex(sha1));
 306
 307         if (show_tag_object)
 308                 while (offset < size && buf[offset] != '\n') {
 309                         int new_offset = offset + 1;
 310                         while (new_offset < size && buf[new_offset++] != '\n')
 311                                 ; /* do nothing */
 312                         if (!prefixcmp(buf + offset, "tagger "))
 313                                 show_tagger(buf + offset + 7,
 314                                             new_offset - offset - 7, rev);
 315                         offset = new_offset;
 316                 }
 317
 318         if (offset < size)
 319                 fwrite(buf + offset, size - offset, 1, stdout);
 320         free(buf);
 321         return 0;
 322 }
 323
 324 static int show_tree_object(const unsigned char *sha1,
 325                 const char *base, int baselen,
 326                 const char *pathname, unsigned mode, int stage, void *context)
 327 {
 328         printf("%s%s\n", pathname, S_ISDIR(mode) ? "/" : "");
 329         return 0;
 330 }
 331
 332 static void show_rev_tweak_rev(struct rev_info *rev, struct setup_revision_opt *opt)
 333 {
 334         if (rev->ignore_merges) {
 335                 /* There was no "-m" on the command line */
 336                 rev->ignore_merges = 0;
 337                 if (!rev->first_parent_only && !rev->combine_merges) {
 338                         /* No "--first-parent", "-c", nor "--cc" */
 339                         rev->combine_merges = 1;
 340                         rev->dense_combined_merges = 1;
 341                 }
 342         }
 343         if (!rev->diffopt.output_format)
 344                 rev->diffopt.output_format = DIFF_FORMAT_PATCH;
 345 }
 346
 347 int cmd_show(int argc, const char **argv, const char *prefix)
 348 {
 349         struct rev_info rev;
 350         struct object_array_entry *objects;
 351         struct setup_revision_opt opt;
 352         int i, count, ret = 0;
 353
 354         git_config(git_log_config, NULL);
 355
 356         if (diff_use_color_default == -1)
 357                 diff_use_color_default = git_use_color_default;
 358
 359         init_revisions(&rev, prefix);
 360         rev.diff = 1;
 361         rev.always_show_header = 1;
 362         rev.no_walk = 1;
 363         memset(&opt, 0, sizeof(opt));
 364         opt.def = "HEAD";
 365         opt.tweak = show_rev_tweak_rev;
 366         cmd_log_init(argc, argv, prefix, &rev, &opt);
 367
 368         count = rev.pending.nr;
 369         objects = rev.pending.objects;
 370         for (i = 0; i < count && !ret; i++) {
 371                 struct object *o = objects[i].item;
 372                 const char *name = objects[i].name;
 373                 switch (o->type) {
 374                 case OBJ_BLOB:
 375                         ret = show_object(o->sha1, 0, NULL);
 376                         break;
 377                 case OBJ_TAG: {
 378                         struct tag *t = (struct tag *)o;
 379
 380                         if (rev.shown_one)
 381                                 putchar('\n');
 382                         printf("%stag %s%s\n",
 383                                         diff_get_color_opt(&rev.diffopt, DIFF_COMMIT),
 384                                         t->tag,
 385                                         diff_get_color_opt(&rev.diffopt, DIFF_RESET));
 386                         ret = show_object(o->sha1, 1, &rev);
 387                         rev.shown_one = 1;
 388                         if (ret)
 389                                 break;
 390                         o = parse_object(t->tagged->sha1);
 391                         if (!o)
 392                                 ret = error("Could not read object %s",
 393                                             sha1_to_hex(t->tagged->sha1));
 394                         objects[i].item = o;
 395                         i--;
 396                         break;
 397                 }
 398                 case OBJ_TREE:
 399                         if (rev.shown_one)
 400                                 putchar('\n');
 401                         printf("%stree %s%s\n\n",
 402                                         diff_get_color_opt(&rev.diffopt, DIFF_COMMIT),
 403                                         name,
 404                                         diff_get_color_opt(&rev.diffopt, DIFF_RESET));
 405                         read_tree_recursive((struct tree *)o, "", 0, 0, NULL,
 406                                         show_tree_object, NULL);
 407                         rev.shown_one = 1;
 408                         break;
 409                 case OBJ_COMMIT:
 410                         rev.pending.nr = rev.pending.alloc = 0;
 411                         rev.pending.objects = NULL;
 412                         add_object_array(o, name, &rev.pending);
 413                         ret = cmd_log_walk(&rev);
 414                         break;
 415                 default:
 416                         ret = error("Unknown type: %d", o->type);
 417                 }
 418         }
 419         free(objects);
 420         return ret;
 421 }
 422
 423 /*
 424  * This is equivalent to "git log -g --abbrev-commit --pretty=oneline"
 425  */
 426 int cmd_log_reflog(int argc, const char **argv, const char *prefix)
 427 {
 428         struct rev_info rev;
 429         struct setup_revision_opt opt;
 430
 431         git_config(git_log_config, NULL);
 432
 433         if (diff_use_color_default == -1)
 434                 diff_use_color_default = git_use_color_default;
 435
 436         init_revisions(&rev, prefix);
 437         init_reflog_walk(&rev.reflog_info);
 438         rev.abbrev_commit = 1;
 439         rev.verbose_header = 1;
 440         memset(&opt, 0, sizeof(opt));
 441         opt.def = "HEAD";
 442         cmd_log_init(argc, argv, prefix, &rev, &opt);
 443
 444         /*
 445          * This means that we override whatever commit format the user gave
 446          * on the cmd line.  Sad, but cmd_log_init() currently doesn't
 447          * allow us to set a different default.
 448          */
 449         rev.commit_format = CMIT_FMT_ONELINE;
 450         rev.use_terminator = 1;
 451         rev.always_show_header = 1;
 452
 453         /*
 454          * We get called through "git reflog", so unlike the other log
 455          * routines, we need to set up our pager manually..
 456          */
 457         setup_pager();
 458
 459         return cmd_log_walk(&rev);
 460 }
 461
 462 int cmd_log(int argc, const char **argv, const char *prefix)
 463 {
 464         struct rev_info rev;
 465         struct setup_revision_opt opt;
 466
 467         git_config(git_log_config, NULL);
 468
 469         if (diff_use_color_default == -1)
 470                 diff_use_color_default = git_use_color_default;
 471
 472         init_revisions(&rev, prefix);
 473         rev.always_show_header = 1;
 474         memset(&opt, 0, sizeof(opt));
 475         opt.def = "HEAD";
 476         cmd_log_init(argc, argv, prefix, &rev, &opt);
 477         return cmd_log_walk(&rev);
 478 }
 479
 480 /* format-patch */
 481
 482 static const char *fmt_patch_suffix = ".patch";
 483 static int numbered = 0;
 484 static int auto_number = 1;
 485
 486 static char *default_attach = NULL;
 487
 488 static struct string_list extra_hdr;
 489 static struct string_list extra_to;
 490 static struct string_list extra_cc;
 491
 492 static void add_header(const char *value)
 493 {
 494         struct string_list_item *item;
 495         int len = strlen(value);
 496         while (len && value[len - 1] == '\n')
 497                 len--;
 498
 499         if (!strncasecmp(value, "to: ", 4)) {
 500                 item = string_list_append(value + 4, &extra_to);
 501                 len -= 4;
 502         } else if (!strncasecmp(value, "cc: ", 4)) {
 503                 item = string_list_append(value + 4, &extra_cc);
 504                 len -= 4;
 505         } else {
 506                 item = string_list_append(value, &extra_hdr);
 507         }
 508
 509         item->string[len] = '\0';
 510 }
 511
 512 #define THREAD_SHALLOW 1
 513 #define THREAD_DEEP 2
 514 static int thread = 0;
 515 static int do_signoff = 0;
 516
 517 static int git_format_config(const char *var, const char *value, void *cb)
 518 {
 519         if (!strcmp(var, "format.headers")) {
 520                 if (!value)
 521                         die("format.headers without value");
 522                 add_header(value);
 523                 return 0;
 524         }
 525         if (!strcmp(var, "format.suffix"))
 526                 return git_config_string(&fmt_patch_suffix, var, value);
 527         if (!strcmp(var, "format.to")) {
 528                 if (!value)
 529                         return config_error_nonbool(var);
 530                 string_list_append(value, &extra_to);
 531                 return 0;
 532         }
 533         if (!strcmp(var, "format.cc")) {
 534                 if (!value)
 535                         return config_error_nonbool(var);
 536                 string_list_append(value, &extra_cc);
 537                 return 0;
 538         }
 539         if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
 540                 return 0;
 541         }
 542         if (!strcmp(var, "format.numbered")) {
 543                 if (value && !strcasecmp(value, "auto")) {
 544                         auto_number = 1;
 545                         return 0;
 546                 }
 547                 numbered = git_config_bool(var, value);
 548                 auto_number = auto_number && numbered;
 549                 return 0;
 550         }
 551         if (!strcmp(var, "format.attach")) {
 552                 if (value && *value)
 553                         default_attach = xstrdup(value);
 554                 else
 555                         default_attach = xstrdup(git_version_string);
 556                 return 0;
 557         }
 558         if (!strcmp(var, "format.thread")) {
 559                 if (value && !strcasecmp(value, "deep")) {
 560                         thread = THREAD_DEEP;
 561                         return 0;
 562                 }
 563                 if (value && !strcasecmp(value, "shallow")) {
 564                         thread = THREAD_SHALLOW;
 565                         return 0;
 566                 }
 567                 thread = git_config_bool(var, value) && THREAD_SHALLOW;
 568                 return 0;
 569         }
 570         if (!strcmp(var, "format.signoff")) {
 571                 do_signoff = git_config_bool(var, value);
 572                 return 0;
 573         }
 574
 575         return git_log_config(var, value, cb);
 576 }
 577
 578 static FILE *realstdout = NULL;
 579 static const char *output_directory = NULL;
 580 static int outdir_offset;
 581
 582 static int reopen_stdout(struct commit *commit, struct rev_info *rev)
 583 {
 584         struct strbuf filename = STRBUF_INIT;
 585         int suffix_len = strlen(fmt_patch_suffix) + 1;
 586
 587         if (output_directory) {
 588                 strbuf_addstr(&filename, output_directory);
 589                 if (filename.len >=
 590                     PATH_MAX - FORMAT_PATCH_NAME_MAX - suffix_len)
 591                         return error("name of output directory is too long");
 592                 if (filename.buf[filename.len - 1] != '/')
 593                         strbuf_addch(&filename, '/');
 594         }
 595
 596         get_patch_filename(commit, rev->nr, fmt_patch_suffix, &filename);
 597
 598         if (!DIFF_OPT_TST(&rev->diffopt, QUICK))
 599                 fprintf(realstdout, "%s\n", filename.buf + outdir_offset);
 600
 601         if (freopen(filename.buf, "w", stdout) == NULL)
 602                 return error("Cannot open patch file %s", filename.buf);
 603
 604         strbuf_release(&filename);
 605         return 0;
 606 }
 607
 608 static void get_patch_ids(struct rev_info *rev, struct patch_ids *ids, const char *prefix)
 609 {
 610         struct rev_info check_rev;
 611         struct commit *commit;
 612         struct object *o1, *o2;
 613         unsigned flags1, flags2;
 614
 615         if (rev->pending.nr != 2)
 616                 die("Need exactly one range.");
 617
 618         o1 = rev->pending.objects[0].item;
 619         flags1 = o1->flags;
 620         o2 = rev->pending.objects[1].item;
 621         flags2 = o2->flags;
 622
 623         if ((flags1 & UNINTERESTING) == (flags2 & UNINTERESTING))
 624                 die("Not a range.");
 625
 626         init_patch_ids(ids);
 627
 628         /* given a range a..b get all patch ids for b..a */
 629         init_revisions(&check_rev, prefix);
 630         o1->flags ^= UNINTERESTING;
 631         o2->flags ^= UNINTERESTING;
 632         add_pending_object(&check_rev, o1, "o1");
 633         add_pending_object(&check_rev, o2, "o2");
 634         if (prepare_revision_walk(&check_rev))
 635                 die("revision walk setup failed");
 636
 637         while ((commit = get_revision(&check_rev)) != NULL) {
 638                 /* ignore merges */
 639                 if (commit->parents && commit->parents->next)
 640                         continue;
 641
 642                 add_commit_patch_id(commit, ids);
 643         }
 644
 645         /* reset for next revision walk */
 646         clear_commit_marks((struct commit *)o1,
 647                         SEEN | UNINTERESTING | SHOWN | ADDED);
 648         clear_commit_marks((struct commit *)o2,
 649                         SEEN | UNINTERESTING | SHOWN | ADDED);
 650         o1->flags = flags1;
 651         o2->flags = flags2;
 652 }
 653
 654 static void gen_message_id(struct rev_info *info, char *base)
 655 {
 656         const char *committer = git_committer_info(IDENT_WARN_ON_NO_NAME);
 657         const char *email_start = strrchr(committer, '<');
 658         const char *email_end = strrchr(committer, '>');
 659         struct strbuf buf = STRBUF_INIT;
 660         if (!email_start || !email_end || email_start > email_end - 1)
 661                 die("Could not extract email from committer identity.");
 662         strbuf_addf(&buf, "%s.%lu.git.%.*s", base,
 663                     (unsigned long) time(NULL),
 664                     (int)(email_end - email_start - 1), email_start + 1);
 665         info->message_id = strbuf_detach(&buf, NULL);
 666 }
 667
 668 static void make_cover_letter(struct rev_info *rev, int use_stdout,
 669                               int numbered, int numbered_files,
 670                               struct commit *origin,
 671                               int nr, struct commit **list, struct commit *head)
 672 {
 673         const char *committer;
 674         const char *subject_start = NULL;
 675         const char *body = "*** SUBJECT HERE ***\n\n*** BLURB HERE ***\n";
 676         const char *msg;
 677         const char *extra_headers = rev->extra_headers;
 678         struct shortlog log;
 679         struct strbuf sb = STRBUF_INIT;
 680         int i;
 681         const char *encoding = "UTF-8";
 682         struct diff_options opts;
 683         int need_8bit_cte = 0;
 684         struct commit *commit = NULL;
 685
 686         if (rev->commit_format != CMIT_FMT_EMAIL)
 687                 die("Cover letter needs email format");
 688
 689         committer = git_committer_info(0);
 690
 691         if (!numbered_files) {
 692                 /*
 693                  * We fake a commit for the cover letter so we get the filename
 694                  * desired.
 695                  */
 696                 commit = xcalloc(1, sizeof(*commit));
 697                 commit->buffer = xmalloc(400);
 698                 snprintf(commit->buffer, 400,
 699                         "tree 0000000000000000000000000000000000000000\n"
 700                         "parent %s\n"
 701                         "author %s\n"
 702                         "committer %s\n\n"
 703                         "cover letter\n",
 704                         sha1_to_hex(head->object.sha1), committer, committer);
 705         }
 706
 707         if (!use_stdout && reopen_stdout(commit, rev))
 708                 return;
 709
 710         if (commit) {
 711
 712                 free(commit->buffer);
 713                 free(commit);
 714         }
 715
 716         log_write_email_headers(rev, head, &subject_start, &extra_headers,
 717                                 &need_8bit_cte);
 718
 719         for (i = 0; !need_8bit_cte && i < nr; i++)
 720                 if (has_non_ascii(list[i]->buffer))
 721                         need_8bit_cte = 1;
 722
 723         msg = body;
 724         pp_user_info(NULL, CMIT_FMT_EMAIL, &sb, committer, DATE_RFC2822,
 725                      encoding);
 726         pp_title_line(CMIT_FMT_EMAIL, &msg, &sb, subject_start, extra_headers,
 727                       encoding, need_8bit_cte);
 728         pp_remainder(CMIT_FMT_EMAIL, &msg, &sb, 0);
 729         printf("%s\n", sb.buf);
 730
 731         strbuf_release(&sb);
 732
 733         shortlog_init(&log);
 734         log.wrap_lines = 1;
 735         log.wrap = 72;
 736         log.in1 = 2;
 737         log.in2 = 4;
 738         for (i = 0; i < nr; i++)
 739                 shortlog_add_commit(&log, list[i]);
 740
 741         shortlog_output(&log);
 742
 743         /*
 744          * We can only do diffstat with a unique reference point
 745          */
 746         if (!origin)
 747                 return;
 748
 749         memcpy(&opts, &rev->diffopt, sizeof(opts));
 750         opts.output_format = DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT;
 751
 752         diff_setup_done(&opts);
 753
 754         diff_tree_sha1(origin->tree->object.sha1,
 755                        head->tree->object.sha1,
 756                        "", &opts);
 757         diffcore_std(&opts);
 758         diff_flush(&opts);
 759
 760         printf("\n");
 761 }
 762
 763 static const char *clean_message_id(const char *msg_id)
 764 {
 765         char ch;
 766         const char *a, *z, *m;
 767
 768         m = msg_id;
 769         while ((ch = *m) && (isspace(ch) || (ch == '<')))
 770                 m++;
 771         a = m;
 772         z = NULL;
 773         while ((ch = *m)) {
 774                 if (!isspace(ch) && (ch != '>'))
 775                         z = m;
 776                 m++;
 777         }
 778         if (!z)
 779                 die("insane in-reply-to: %s", msg_id);
 780         if (++z == m)
 781                 return a;
 782         return xmemdupz(a, z - a);
 783 }
 784
 785 static const char *set_outdir(const char *prefix, const char *output_directory)
 786 {
 787         if (output_directory && is_absolute_path(output_directory))
 788                 return output_directory;
 789
 790         if (!prefix || !*prefix) {
 791                 if (output_directory)
 792                         return output_directory;
 793                 /* The user did not explicitly ask for "./" */
 794                 outdir_offset = 2;
 795                 return "./";
 796         }
 797
 798         outdir_offset = strlen(prefix);
 799         if (!output_directory)
 800                 return prefix;
 801
 802         return xstrdup(prefix_filename(prefix, outdir_offset,
 803                                        output_directory));
 804 }
 805
 806 static const char * const builtin_format_patch_usage[] = {
 807         "git format-patch [options] [<since> | <revision range>]",
 808         NULL
 809 };
 810
 811 static int keep_subject = 0;
 812
 813 static int keep_callback(const struct option *opt, const char *arg, int unset)
 814 {
 815         ((struct rev_info *)opt->value)->total = -1;
 816         keep_subject = 1;
 817         return 0;
 818 }
 819
 820 static int subject_prefix = 0;
 821
 822 static int subject_prefix_callback(const struct option *opt, const char *arg,
 823                             int unset)
 824 {
 825         subject_prefix = 1;
 826         ((struct rev_info *)opt->value)->subject_prefix = arg;
 827         return 0;
 828 }
 829
 830 static int numbered_cmdline_opt = 0;
 831
 832 static int numbered_callback(const struct option *opt, const char *arg,
 833                              int unset)
 834 {
 835         *(int *)opt->value = numbered_cmdline_opt = unset ? 0 : 1;
 836         if (unset)
 837                 auto_number =  0;
 838         return 0;
 839 }
 840
 841 static int no_numbered_callback(const struct option *opt, const char *arg,
 842                                 int unset)
 843 {
 844         return numbered_callback(opt, arg, 1);
 845 }
 846
 847 static int output_directory_callback(const struct option *opt, const char *arg,
 848                               int unset)
 849 {
 850         const char **dir = (const char **)opt->value;
 851         if (*dir)
 852                 die("Two output directories?");
 853         *dir = arg;
 854         return 0;
 855 }
 856
 857 static int thread_callback(const struct option *opt, const char *arg, int unset)
 858 {
 859         int *thread = (int *)opt->value;
 860         if (unset)
 861                 *thread = 0;
 862         else if (!arg || !strcmp(arg, "shallow"))
 863                 *thread = THREAD_SHALLOW;
 864         else if (!strcmp(arg, "deep"))
 865                 *thread = THREAD_DEEP;
 866         else
 867                 return 1;
 868         return 0;
 869 }
 870
 871 static int attach_callback(const struct option *opt, const char *arg, int unset)
 872 {
 873         struct rev_info *rev = (struct rev_info *)opt->value;
 874         if (unset)
 875                 rev->mime_boundary = NULL;
 876         else if (arg)
 877                 rev->mime_boundary = arg;
 878         else
 879                 rev->mime_boundary = git_version_string;
 880         rev->no_inline = unset ? 0 : 1;
 881         return 0;
 882 }
 883
 884 static int inline_callback(const struct option *opt, const char *arg, int unset)
 885 {
 886         struct rev_info *rev = (struct rev_info *)opt->value;
 887         if (unset)
 888                 rev->mime_boundary = NULL;
 889         else if (arg)
 890                 rev->mime_boundary = arg;
 891         else
 892                 rev->mime_boundary = git_version_string;
 893         rev->no_inline = 0;
 894         return 0;
 895 }
 896
 897 static int header_callback(const struct option *opt, const char *arg, int unset)
 898 {
 899         if (unset) {
 900                 string_list_clear(&extra_hdr, 0);
 901                 string_list_clear(&extra_to, 0);
 902                 string_list_clear(&extra_cc, 0);
 903         } else {
 904             add_header(arg);
 905         }
 906         return 0;
 907 }
 908
 909 static int to_callback(const struct option *opt, const char *arg, int unset)
 910 {
 911         if (unset)
 912                 string_list_clear(&extra_to, 0);
 913         else
 914                 string_list_append(arg, &extra_to);
 915         return 0;
 916 }
 917
 918 static int cc_callback(const struct option *opt, const char *arg, int unset)
 919 {
 920         if (unset)
 921                 string_list_clear(&extra_cc, 0);
 922         else
 923                 string_list_append(arg, &extra_cc);
 924         return 0;
 925 }
 926
 927 int cmd_format_patch(int argc, const char **argv, const char *prefix)
 928 {
 929         struct commit *commit;
 930         struct commit **list = NULL;
 931         struct rev_info rev;
 932         struct setup_revision_opt s_r_opt;
 933         int nr = 0, total, i;
 934         int use_stdout = 0;
 935         int start_number = -1;
 936         int numbered_files = 0;         /* _just_ numbers */
 937         int ignore_if_in_upstream = 0;
 938         int cover_letter = 0;
 939         int boundary_count = 0;
 940         int no_binary_diff = 0;
 941         struct commit *origin = NULL, *head = NULL;
 942         const char *in_reply_to = NULL;
 943         struct patch_ids ids;
 944         char *add_signoff = NULL;
 945         struct strbuf buf = STRBUF_INIT;
 946         int use_patch_format = 0;
 947         const struct option builtin_format_patch_options[] = {
 948                 { OPTION_CALLBACK, 'n', "numbered", &numbered, NULL,
 949                             "use [PATCH n/m] even with a single patch",
 950                             PARSE_OPT_NOARG, numbered_callback },
 951                 { OPTION_CALLBACK, 'N', "no-numbered", &numbered, NULL,
 952                             "use [PATCH] even with multiple patches",
 953                             PARSE_OPT_NOARG, no_numbered_callback },
 954                 OPT_BOOLEAN('s', "signoff", &do_signoff, "add Signed-off-by:"),
 955                 OPT_BOOLEAN(0, "stdout", &use_stdout,
 956                             "print patches to standard out"),
 957                 OPT_BOOLEAN(0, "cover-letter", &cover_letter,
 958                             "generate a cover letter"),
 959                 OPT_BOOLEAN(0, "numbered-files", &numbered_files,
 960                             "use simple number sequence for output file names"),
 961                 OPT_STRING(0, "suffix", &fmt_patch_suffix, "sfx",
 962                             "use <sfx> instead of '.patch'"),
 963                 OPT_INTEGER(0, "start-number", &start_number,
 964                             "start numbering patches at <n> instead of 1"),
 965                 { OPTION_CALLBACK, 0, "subject-prefix", &rev, "prefix",
 966                             "Use [<prefix>] instead of [PATCH]",
 967                             PARSE_OPT_NONEG, subject_prefix_callback },
 968                 { OPTION_CALLBACK, 'o', "output-directory", &output_directory,
 969                             "dir", "store resulting files in <dir>",
 970                             PARSE_OPT_NONEG, output_directory_callback },
 971                 { OPTION_CALLBACK, 'k', "keep-subject", &rev, NULL,
 972                             "don't strip/add [PATCH]",
 973                             PARSE_OPT_NOARG | PARSE_OPT_NONEG, keep_callback },
 974                 OPT_BOOLEAN(0, "no-binary", &no_binary_diff,
 975                             "don't output binary diffs"),
 976                 OPT_BOOLEAN(0, "ignore-if-in-upstream", &ignore_if_in_upstream,
 977                             "don't include a patch matching a commit upstream"),
 978                 { OPTION_BOOLEAN, 'p', "no-stat", &use_patch_format, NULL,
 979                   "show patch format instead of default (patch + stat)",
 980                   PARSE_OPT_NONEG | PARSE_OPT_NOARG },
 981                 OPT_GROUP("Messaging"),
 982                 { OPTION_CALLBACK, 0, "add-header", NULL, "header",
 983                             "add email header", 0, header_callback },
 984                 { OPTION_CALLBACK, 0, "to", NULL, "email", "add To: header",
 985                             0, to_callback },
 986                 { OPTION_CALLBACK, 0, "cc", NULL, "email", "add Cc: header",
 987                             0, cc_callback },
 988                 OPT_STRING(0, "in-reply-to", &in_reply_to, "message-id",
 989                             "make first mail a reply to <message-id>"),
 990                 { OPTION_CALLBACK, 0, "attach", &rev, "boundary",
 991                             "attach the patch", PARSE_OPT_OPTARG,
 992                             attach_callback },
 993                 { OPTION_CALLBACK, 0, "inline", &rev, "boundary",
 994                             "inline the patch",
 995                             PARSE_OPT_OPTARG | PARSE_OPT_NONEG,
 996                             inline_callback },
 997                 { OPTION_CALLBACK, 0, "thread", &thread, "style",
 998                             "enable message threading, styles: shallow, deep",
 999                             PARSE_OPT_OPTARG, thread_callback },
1000                 OPT_END()
1001         };
1002
1003         extra_hdr.strdup_strings = 1;
1004         extra_to.strdup_strings = 1;
1005         extra_cc.strdup_strings = 1;
1006         git_config(git_format_config, NULL);
1007         init_revisions(&rev, prefix);
1008         rev.commit_format = CMIT_FMT_EMAIL;
1009         rev.verbose_header = 1;
1010         rev.diff = 1;
1011         rev.combine_merges = 0;
1012         rev.ignore_merges = 1;
1013         DIFF_OPT_SET(&rev.diffopt, RECURSIVE);
1014         rev.subject_prefix = fmt_patch_subject_prefix;
1015         memset(&s_r_opt, 0, sizeof(s_r_opt));
1016         s_r_opt.def = "HEAD";
1017
1018         if (default_attach) {
1019                 rev.mime_boundary = default_attach;
1020                 rev.no_inline = 1;
1021         }
1022
1023         /*
1024          * Parse the arguments before setup_revisions(), or something
1025          * like "git format-patch -o a123 HEAD^.." may fail; a123 is
1026          * possibly a valid SHA1.
1027          */
1028         argc = parse_options(argc, argv, prefix, builtin_format_patch_options,
1029                              builtin_format_patch_usage,
1030                              PARSE_OPT_KEEP_ARGV0 | PARSE_OPT_KEEP_UNKNOWN |
1031                              PARSE_OPT_KEEP_DASHDASH);
1032
1033         if (do_signoff) {
1034                 const char *committer;
1035                 const char *endpos;
1036                 committer = git_committer_info(IDENT_ERROR_ON_NO_NAME);
1037                 endpos = strchr(committer, '>');
1038                 if (!endpos)
1039                         die("bogus committer info %s", committer);
1040                 add_signoff = xmemdupz(committer, endpos - committer + 1);
1041         }
1042
1043         for (i = 0; i < extra_hdr.nr; i++) {
1044                 strbuf_addstr(&buf, extra_hdr.items[i].string);
1045                 strbuf_addch(&buf, '\n');
1046         }
1047
1048         if (extra_to.nr)
1049                 strbuf_addstr(&buf, "To: ");
1050         for (i = 0; i < extra_to.nr; i++) {
1051                 if (i)
1052                         strbuf_addstr(&buf, "    ");
1053                 strbuf_addstr(&buf, extra_to.items[i].string);
1054                 if (i + 1 < extra_to.nr)
1055                         strbuf_addch(&buf, ',');
1056                 strbuf_addch(&buf, '\n');
1057         }
1058
1059         if (extra_cc.nr)
1060                 strbuf_addstr(&buf, "Cc: ");
1061         for (i = 0; i < extra_cc.nr; i++) {
1062                 if (i)
1063                         strbuf_addstr(&buf, "    ");
1064                 strbuf_addstr(&buf, extra_cc.items[i].string);
1065                 if (i + 1 < extra_cc.nr)
1066                         strbuf_addch(&buf, ',');
1067                 strbuf_addch(&buf, '\n');
1068         }
1069
1070         rev.extra_headers = strbuf_detach(&buf, NULL);
1071
1072         if (start_number < 0)
1073                 start_number = 1;
1074
1075         /*
1076          * If numbered is set solely due to format.numbered in config,
1077          * and it would conflict with --keep-subject (-k) from the
1078          * command line, reset "numbered".
1079          */
1080         if (numbered && keep_subject && !numbered_cmdline_opt)
1081                 numbered = 0;
1082
1083         if (numbered && keep_subject)
1084                 die ("-n and -k are mutually exclusive.");
1085         if (keep_subject && subject_prefix)
1086                 die ("--subject-prefix and -k are mutually exclusive.");
1087
1088         argc = setup_revisions(argc, argv, &rev, &s_r_opt);
1089         if (argc > 1)
1090                 die ("unrecognized argument: %s", argv[1]);
1091
1092         if (rev.diffopt.output_format & DIFF_FORMAT_NAME)
1093                 die("--name-only does not make sense");
1094         if (rev.diffopt.output_format & DIFF_FORMAT_NAME_STATUS)
1095                 die("--name-status does not make sense");
1096         if (rev.diffopt.output_format & DIFF_FORMAT_CHECKDIFF)
1097                 die("--check does not make sense");
1098
1099         if (!use_patch_format &&
1100                 (!rev.diffopt.output_format ||
1101                  rev.diffopt.output_format == DIFF_FORMAT_PATCH))
1102                 rev.diffopt.output_format = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_SUMMARY;
1103
1104         /* Always generate a patch */
1105         rev.diffopt.output_format |= DIFF_FORMAT_PATCH;
1106
1107         if (!DIFF_OPT_TST(&rev.diffopt, TEXT) && !no_binary_diff)
1108                 DIFF_OPT_SET(&rev.diffopt, BINARY);
1109
1110         if (rev.show_notes)
1111                 init_display_notes(&rev.notes_opt);
1112
1113         if (!use_stdout)
1114                 output_directory = set_outdir(prefix, output_directory);
1115
1116         if (output_directory) {
1117                 if (use_stdout)
1118                         die("standard output, or directory, which one?");
1119                 if (mkdir(output_directory, 0777) < 0 && errno != EEXIST)
1120                         die_errno("Could not create directory '%s'",
1121                                   output_directory);
1122         }
1123
1124         if (rev.pending.nr == 1) {
1125                 if (rev.max_count < 0 && !rev.show_root_diff) {
1126                         /*
1127                          * This is traditional behaviour of "git format-patch
1128                          * origin" that prepares what the origin side still
1129                          * does not have.
1130                          */
1131                         rev.pending.objects[0].item->flags |= UNINTERESTING;
1132                         add_head_to_pending(&rev);
1133                 }
1134                 /*
1135                  * Otherwise, it is "format-patch -22 HEAD", and/or
1136                  * "format-patch --root HEAD".  The user wants
1137                  * get_revision() to do the usual traversal.
1138                  */
1139         }
1140
1141         /*
1142          * We cannot move this anywhere earlier because we do want to
1143          * know if --root was given explicitly from the command line.
1144          */
1145         rev.show_root_diff = 1;
1146
1147         if (cover_letter) {
1148                 /* remember the range */
1149                 int i;
1150                 for (i = 0; i < rev.pending.nr; i++) {
1151                         struct object *o = rev.pending.objects[i].item;
1152                         if (!(o->flags & UNINTERESTING))
1153                                 head = (struct commit *)o;
1154                 }
1155                 /* We can't generate a cover letter without any patches */
1156                 if (!head)
1157                         return 0;
1158         }
1159
1160         if (ignore_if_in_upstream)
1161                 get_patch_ids(&rev, &ids, prefix);
1162
1163         if (!use_stdout)
1164                 realstdout = xfdopen(xdup(1), "w");
1165
1166         if (prepare_revision_walk(&rev))
1167                 die("revision walk setup failed");
1168         rev.boundary = 1;
1169         while ((commit = get_revision(&rev)) != NULL) {
1170                 if (commit->object.flags & BOUNDARY) {
1171                         boundary_count++;
1172                         origin = (boundary_count == 1) ? commit : NULL;
1173                         continue;
1174                 }
1175
1176                 /* ignore merges */
1177                 if (commit->parents && commit->parents->next)
1178                         continue;
1179
1180                 if (ignore_if_in_upstream &&
1181                                 has_commit_patch_id(commit, &ids))
1182                         continue;
1183
1184                 nr++;
1185                 list = xrealloc(list, nr * sizeof(list[0]));
1186                 list[nr - 1] = commit;
1187         }
1188         total = nr;
1189         if (!keep_subject && auto_number && total > 1)
1190                 numbered = 1;
1191         if (numbered)
1192                 rev.total = total + start_number - 1;
1193         if (in_reply_to || thread || cover_letter)
1194                 rev.ref_message_ids = xcalloc(1, sizeof(struct string_list));
1195         if (in_reply_to) {
1196                 const char *msgid = clean_message_id(in_reply_to);
1197                 string_list_append(msgid, rev.ref_message_ids);
1198         }
1199         rev.numbered_files = numbered_files;
1200         rev.patch_suffix = fmt_patch_suffix;
1201         if (cover_letter) {
1202                 if (thread)
1203                         gen_message_id(&rev, "cover");
1204                 make_cover_letter(&rev, use_stdout, numbered, numbered_files,
1205                                   origin, nr, list, head);
1206                 total++;
1207                 start_number--;
1208         }
1209         rev.add_signoff = add_signoff;
1210         while (0 <= --nr) {
1211                 int shown;
1212                 commit = list[nr];
1213                 rev.nr = total - nr + (start_number - 1);
1214                 /* Make the second and subsequent mails replies to the first */
1215                 if (thread) {
1216                         /* Have we already had a message ID? */
1217                         if (rev.message_id) {
1218                                 /*
1219                                  * For deep threading: make every mail
1220                                  * a reply to the previous one, no
1221                                  * matter what other options are set.
1222                                  *
1223                                  * For shallow threading:
1224                                  *
1225                                  * Without --cover-letter and
1226                                  * --in-reply-to, make every mail a
1227                                  * reply to the one before.
1228                                  *
1229                                  * With --in-reply-to but no
1230                                  * --cover-letter, make every mail a
1231                                  * reply to the <reply-to>.
1232                                  *
1233                                  * With --cover-letter, make every
1234                                  * mail but the cover letter a reply
1235                                  * to the cover letter.  The cover
1236                                  * letter is a reply to the
1237                                  * --in-reply-to, if specified.
1238                                  */
1239                                 if (thread == THREAD_SHALLOW
1240                                     && rev.ref_message_ids->nr > 0
1241                                     && (!cover_letter || rev.nr > 1))
1242                                         free(rev.message_id);
1243                                 else
1244                                         string_list_append(rev.message_id,
1245                                                            rev.ref_message_ids);
1246                         }
1247                         gen_message_id(&rev, sha1_to_hex(commit->object.sha1));
1248                 }
1249
1250                 if (!use_stdout && reopen_stdout(numbered_files ? NULL : commit,
1251                                                  &rev))
1252                         die("Failed to create output files");
1253                 shown = log_tree_commit(&rev, commit);
1254                 free(commit->buffer);
1255                 commit->buffer = NULL;
1256
1257                 /* We put one extra blank line between formatted
1258                  * patches and this flag is used by log-tree code
1259                  * to see if it needs to emit a LF before showing
1260                  * the log; when using one file per patch, we do
1261                  * not want the extra blank line.
1262                  */
1263                 if (!use_stdout)
1264                         rev.shown_one = 0;
1265                 if (shown) {
1266                         if (rev.mime_boundary)
1267                                 printf("\n--%s%s--\n\n\n",
1268                                        mime_boundary_leader,
1269                                        rev.mime_boundary);
1270                         else
1271                                 printf("-- \n%s\n\n", git_version_string);
1272                 }
1273                 if (!use_stdout)
1274                         fclose(stdout);
1275         }
1276         free(list);
1277         string_list_clear(&extra_to, 0);
1278         string_list_clear(&extra_cc, 0);
1279         string_list_clear(&extra_hdr, 0);
1280         if (ignore_if_in_upstream)
1281                 free_patch_ids(&ids);
1282         return 0;
1283 }
1284
1285 static int add_pending_commit(const char *arg, struct rev_info *revs, int flags)
1286 {
1287         unsigned char sha1[20];
1288         if (get_sha1(arg, sha1) == 0) {
1289                 struct commit *commit = lookup_commit_reference(sha1);
1290                 if (commit) {
1291                         commit->object.flags |= flags;
1292                         add_pending_object(revs, &commit->object, arg);
1293                         return 0;
1294                 }
1295         }
1296         return -1;
1297 }
1298
1299 static const char cherry_usage[] =
1300 "git cherry [-v] [<upstream> [<head> [<limit>]]]";
1301 int cmd_cherry(int argc, const char **argv, const char *prefix)
1302 {
1303         struct rev_info revs;
1304         struct patch_ids ids;
1305         struct commit *commit;
1306         struct commit_list *list = NULL;
1307         struct branch *current_branch;
1308         const char *upstream;
1309         const char *head = "HEAD";
1310         const char *limit = NULL;
1311         int verbose = 0;
1312
1313         if (argc > 1 && !strcmp(argv[1], "-v")) {
1314                 verbose = 1;
1315                 argc--;
1316                 argv++;
1317         }
1318
1319         if (argc > 1 && !strcmp(argv[1], "-h"))
1320                 usage(cherry_usage);
1321
1322         switch (argc) {
1323         case 4:
1324                 limit = argv[3];
1325                 /* FALLTHROUGH */
1326         case 3:
1327                 head = argv[2];
1328                 /* FALLTHROUGH */
1329         case 2:
1330                 upstream = argv[1];
1331                 break;
1332         default:
1333                 current_branch = branch_get(NULL);
1334                 if (!current_branch || !current_branch->merge
1335                                         || !current_branch->merge[0]
1336                                         || !current_branch->merge[0]->dst) {
1337                         fprintf(stderr, "Could not find a tracked"
1338                                         " remote branch, please"
1339                                         " specify <upstream> manually.\n");
1340                         usage(cherry_usage);
1341                 }
1342
1343                 upstream = current_branch->merge[0]->dst;
1344         }
1345
1346         init_revisions(&revs, prefix);
1347         revs.diff = 1;
1348         revs.combine_merges = 0;
1349         revs.ignore_merges = 1;
1350         DIFF_OPT_SET(&revs.diffopt, RECURSIVE);
1351
1352         if (add_pending_commit(head, &revs, 0))
1353                 die("Unknown commit %s", head);
1354         if (add_pending_commit(upstream, &revs, UNINTERESTING))
1355                 die("Unknown commit %s", upstream);
1356
1357         /* Don't say anything if head and upstream are the same. */
1358         if (revs.pending.nr == 2) {
1359                 struct object_array_entry *o = revs.pending.objects;
1360                 if (hashcmp(o[0].item->sha1, o[1].item->sha1) == 0)
1361                         return 0;
1362         }
1363
1364         get_patch_ids(&revs, &ids, prefix);
1365
1366         if (limit && add_pending_commit(limit, &revs, UNINTERESTING))
1367                 die("Unknown commit %s", limit);
1368
1369         /* reverse the list of commits */
1370         if (prepare_revision_walk(&revs))
1371                 die("revision walk setup failed");
1372         while ((commit = get_revision(&revs)) != NULL) {
1373                 /* ignore merges */
1374                 if (commit->parents && commit->parents->next)
1375                         continue;
1376
1377                 commit_list_insert(commit, &list);
1378         }
1379
1380         while (list) {
1381                 char sign = '+';
1382
1383                 commit = list->item;
1384                 if (has_commit_patch_id(commit, &ids))
1385                         sign = '-';
1386
1387                 if (verbose) {
1388                         struct strbuf buf = STRBUF_INIT;
1389                         struct pretty_print_context ctx = {0};
1390                         pretty_print_commit(CMIT_FMT_ONELINE, commit,
1391                                             &buf, &ctx);
1392                         printf("%c %s %s\n", sign,
1393                                sha1_to_hex(commit->object.sha1), buf.buf);
1394                         strbuf_release(&buf);
1395                 }
1396                 else {
1397                         printf("%c %s\n", sign,
1398                                sha1_to_hex(commit->object.sha1));
1399                 }
1400
1401                 list = list->next;
1402         }
1403
1404         free_patch_ids(&ids);
1405         return 0;
1406 }