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 int decoration_style;
  28 static const char *fmt_patch_subject_prefix = "PATCH";
  29 static const char *fmt_pretty;
  30
  31 static const char * const builtin_log_usage =
  32         "git log [<options>] [<since>..<until>] [[--] <path>...]\n"
  33         "   or: git show [options] <object>...";
  34
  35 static int parse_decoration_style(const char *var, const char *value)
  36 {
  37         switch (git_config_maybe_bool(var, value)) {
  38         case 1:
  39                 return DECORATE_SHORT_REFS;
  40         case 0:
  41                 return 0;
  42         default:
  43                 break;
  44         }
  45         if (!strcmp(value, "full"))
  46                 return DECORATE_FULL_REFS;
  47         else if (!strcmp(value, "short"))
  48                 return DECORATE_SHORT_REFS;
  49         return -1;
  50 }
  51
  52 static void cmd_log_init(int argc, const char **argv, const char *prefix,
  53                          struct rev_info *rev, struct setup_revision_opt *opt)
  54 {
  55         int i;
  56         int decoration_given = 0;
  57         struct userformat_want w;
  58
  59         rev->abbrev = DEFAULT_ABBREV;
  60         rev->commit_format = CMIT_FMT_DEFAULT;
  61         if (fmt_pretty)
  62                 get_commit_format(fmt_pretty, rev);
  63         rev->verbose_header = 1;
  64         DIFF_OPT_SET(&rev->diffopt, RECURSIVE);
  65         rev->show_root_diff = default_show_root;
  66         rev->subject_prefix = fmt_patch_subject_prefix;
  67         DIFF_OPT_SET(&rev->diffopt, ALLOW_TEXTCONV);
  68
  69         if (default_date_mode)
  70                 rev->date_mode = parse_date_format(default_date_mode);
  71
  72         /*
  73          * Check for -h before setup_revisions(), or "git log -h" will
  74          * fail when run without a git directory.
  75          */
  76         if (argc == 2 && !strcmp(argv[1], "-h"))
  77                 usage(builtin_log_usage);
  78         argc = setup_revisions(argc, argv, rev, opt);
  79
  80         memset(&w, 0, sizeof(w));
  81         userformat_find_requirements(NULL, &w);
  82
  83         if (!rev->show_notes_given && (!rev->pretty_given || w.notes))
  84                 rev->show_notes = 1;
  85         if (rev->show_notes)
  86                 init_display_notes(&rev->notes_opt);
  87
  88         if (rev->diffopt.pickaxe || rev->diffopt.filter)
  89                 rev->always_show_header = 0;
  90         if (DIFF_OPT_TST(&rev->diffopt, FOLLOW_RENAMES)) {
  91                 rev->always_show_header = 0;
  92                 if (rev->diffopt.nr_paths != 1)
  93                         usage("git logs can only follow renames on one pathname at a time");
  94         }
  95         for (i = 1; i < argc; i++) {
  96                 const char *arg = argv[i];
  97                 if (!strcmp(arg, "--decorate")) {
  98                         decoration_style = DECORATE_SHORT_REFS;
  99                         decoration_given = 1;
 100                 } else if (!prefixcmp(arg, "--decorate=")) {
 101                         const char *v = skip_prefix(arg, "--decorate=");
 102                         decoration_style = parse_decoration_style(arg, v);
 103                         if (decoration_style < 0)
 104                                 die("invalid --decorate option: %s", arg);
 105                         decoration_given = 1;
 106                 } else if (!strcmp(arg, "--no-decorate")) {
 107                         decoration_style = 0;
 108                 } else if (!strcmp(arg, "--source")) {
 109                         rev->show_source = 1;
 110                 } else if (!strcmp(arg, "-h")) {
 111                         usage(builtin_log_usage);
 112                 } else
 113                         die("unrecognized argument: %s", arg);
 114         }
 115
 116         /*
 117          * defeat log.decorate configuration interacting with --pretty=raw
 118          * from the command line.
 119          */
 120         if (!decoration_given && rev->pretty_given
 121             && rev->commit_format == CMIT_FMT_RAW)
 122                 decoration_style = 0;
 123
 124         if (decoration_style) {
 125                 rev->show_decorations = 1;
 126                 load_ref_decorations(decoration_style);
 127         }
 128 }
 129
 130 /*
 131  * This gives a rough estimate for how many commits we
 132  * will print out in the list.
 133  */
 134 static int estimate_commit_count(struct rev_info *rev, struct commit_list *list)
 135 {
 136         int n = 0;
 137
 138         while (list) {
 139                 struct commit *commit = list->item;
 140                 unsigned int flags = commit->object.flags;
 141                 list = list->next;
 142                 if (!(flags & (TREESAME | UNINTERESTING)))
 143                         n++;
 144         }
 145         return n;
 146 }
 147
 148 static void show_early_header(struct rev_info *rev, const char *stage, int nr)
 149 {
 150         if (rev->shown_one) {
 151                 rev->shown_one = 0;
 152                 if (rev->commit_format != CMIT_FMT_ONELINE)
 153                         putchar(rev->diffopt.line_termination);
 154         }
 155         printf("Final output: %d %s\n", nr, stage);
 156 }
 157
 158 static struct itimerval early_output_timer;
 159
 160 static void log_show_early(struct rev_info *revs, struct commit_list *list)
 161 {
 162         int i = revs->early_output;
 163         int show_header = 1;
 164
 165         sort_in_topological_order(&list, revs->lifo);
 166         while (list && i) {
 167                 struct commit *commit = list->item;
 168                 switch (simplify_commit(revs, commit)) {
 169                 case commit_show:
 170                         if (show_header) {
 171                                 int n = estimate_commit_count(revs, list);
 172                                 show_early_header(revs, "incomplete", n);
 173                                 show_header = 0;
 174                         }
 175                         log_tree_commit(revs, commit);
 176                         i--;
 177                         break;
 178                 case commit_ignore:
 179                         break;
 180                 case commit_error:
 181                         return;
 182                 }
 183                 list = list->next;
 184         }
 185
 186         /* Did we already get enough commits for the early output? */
 187         if (!i)
 188                 return;
 189
 190         /*
 191          * ..if no, then repeat it twice a second until we
 192          * do.
 193          *
 194          * NOTE! We don't use "it_interval", because if the
 195          * reader isn't listening, we want our output to be
 196          * throttled by the writing, and not have the timer
 197          * trigger every second even if we're blocked on a
 198          * reader!
 199          */
 200         early_output_timer.it_value.tv_sec = 0;
 201         early_output_timer.it_value.tv_usec = 500000;
 202         setitimer(ITIMER_REAL, &early_output_timer, NULL);
 203 }
 204
 205 static void early_output(int signal)
 206 {
 207         show_early_output = log_show_early;
 208 }
 209
 210 static void setup_early_output(struct rev_info *rev)
 211 {
 212         struct sigaction sa;
 213
 214         /*
 215          * Set up the signal handler, minimally intrusively:
 216          * we only set a single volatile integer word (not
 217          * using sigatomic_t - trying to avoid unnecessary
 218          * system dependencies and headers), and using
 219          * SA_RESTART.
 220          */
 221         memset(&sa, 0, sizeof(sa));
 222         sa.sa_handler = early_output;
 223         sigemptyset(&sa.sa_mask);
 224         sa.sa_flags = SA_RESTART;
 225         sigaction(SIGALRM, &sa, NULL);
 226
 227         /*
 228          * If we can get the whole output in less than a
 229          * tenth of a second, don't even bother doing the
 230          * early-output thing..
 231          *
 232          * This is a one-time-only trigger.
 233          */
 234         early_output_timer.it_value.tv_sec = 0;
 235         early_output_timer.it_value.tv_usec = 100000;
 236         setitimer(ITIMER_REAL, &early_output_timer, NULL);
 237 }
 238
 239 static void finish_early_output(struct rev_info *rev)
 240 {
 241         int n = estimate_commit_count(rev, rev->commits);
 242         signal(SIGALRM, SIG_IGN);
 243         show_early_header(rev, "done", n);
 244 }
 245
 246 static int cmd_log_walk(struct rev_info *rev)
 247 {
 248         struct commit *commit;
 249
 250         if (rev->early_output)
 251                 setup_early_output(rev);
 252
 253         if (prepare_revision_walk(rev))
 254                 die("revision walk setup failed");
 255
 256         if (rev->early_output)
 257                 finish_early_output(rev);
 258
 259         /*
 260          * For --check and --exit-code, the exit code is based on CHECK_FAILED
 261          * and HAS_CHANGES being accumulated in rev->diffopt, so be careful to
 262          * retain that state information if replacing rev->diffopt in this loop
 263          */
 264         while ((commit = get_revision(rev)) != NULL) {
 265                 log_tree_commit(rev, commit);
 266                 if (!rev->reflog_info) {
 267                         /* we allow cycles in reflog ancestry */
 268                         free(commit->buffer);
 269                         commit->buffer = NULL;
 270                 }
 271                 free_commit_list(commit->parents);
 272                 commit->parents = NULL;
 273         }
 274         if (rev->diffopt.output_format & DIFF_FORMAT_CHECKDIFF &&
 275             DIFF_OPT_TST(&rev->diffopt, CHECK_FAILED)) {
 276                 return 02;
 277         }
 278         return diff_result_code(&rev->diffopt, 0);
 279 }
 280
 281 static int git_log_config(const char *var, const char *value, void *cb)
 282 {
 283         if (!strcmp(var, "format.pretty"))
 284                 return git_config_string(&fmt_pretty, var, value);
 285         if (!strcmp(var, "format.subjectprefix"))
 286                 return git_config_string(&fmt_patch_subject_prefix, var, value);
 287         if (!strcmp(var, "log.date"))
 288                 return git_config_string(&default_date_mode, var, value);
 289         if (!strcmp(var, "log.decorate")) {
 290                 decoration_style = parse_decoration_style(var, value);
 291                 if (decoration_style < 0)
 292                         decoration_style = 0; /* maybe warn? */
 293                 return 0;
 294         }
 295         if (!strcmp(var, "log.showroot")) {
 296                 default_show_root = git_config_bool(var, value);
 297                 return 0;
 298         }
 299         return git_diff_ui_config(var, value, cb);
 300 }
 301
 302 int cmd_whatchanged(int argc, const char **argv, const char *prefix)
 303 {
 304         struct rev_info rev;
 305         struct setup_revision_opt opt;
 306
 307         git_config(git_log_config, NULL);
 308
 309         if (diff_use_color_default == -1)
 310                 diff_use_color_default = git_use_color_default;
 311
 312         init_revisions(&rev, prefix);
 313         rev.diff = 1;
 314         rev.simplify_history = 0;
 315         memset(&opt, 0, sizeof(opt));
 316         opt.def = "HEAD";
 317         cmd_log_init(argc, argv, prefix, &rev, &opt);
 318         if (!rev.diffopt.output_format)
 319                 rev.diffopt.output_format = DIFF_FORMAT_RAW;
 320         return cmd_log_walk(&rev);
 321 }
 322
 323 static void show_tagger(char *buf, int len, struct rev_info *rev)
 324 {
 325         struct strbuf out = STRBUF_INIT;
 326
 327         pp_user_info("Tagger", rev->commit_format, &out, buf, rev->date_mode,
 328                 git_log_output_encoding ?
 329                 git_log_output_encoding: git_commit_encoding);
 330         printf("%s", out.buf);
 331         strbuf_release(&out);
 332 }
 333
 334 static int show_object(const unsigned char *sha1, int show_tag_object,
 335         struct rev_info *rev)
 336 {
 337         unsigned long size;
 338         enum object_type type;
 339         char *buf = read_sha1_file(sha1, &type, &size);
 340         int offset = 0;
 341
 342         if (!buf)
 343                 return error("Could not read object %s", sha1_to_hex(sha1));
 344
 345         if (show_tag_object)
 346                 while (offset < size && buf[offset] != '\n') {
 347                         int new_offset = offset + 1;
 348                         while (new_offset < size && buf[new_offset++] != '\n')
 349                                 ; /* do nothing */
 350                         if (!prefixcmp(buf + offset, "tagger "))
 351                                 show_tagger(buf + offset + 7,
 352                                             new_offset - offset - 7, rev);
 353                         offset = new_offset;
 354                 }
 355
 356         if (offset < size)
 357                 fwrite(buf + offset, size - offset, 1, stdout);
 358         free(buf);
 359         return 0;
 360 }
 361
 362 static int show_tree_object(const unsigned char *sha1,
 363                 const char *base, int baselen,
 364                 const char *pathname, unsigned mode, int stage, void *context)
 365 {
 366         printf("%s%s\n", pathname, S_ISDIR(mode) ? "/" : "");
 367         return 0;
 368 }
 369
 370 static void show_rev_tweak_rev(struct rev_info *rev, struct setup_revision_opt *opt)
 371 {
 372         if (rev->ignore_merges) {
 373                 /* There was no "-m" on the command line */
 374                 rev->ignore_merges = 0;
 375                 if (!rev->first_parent_only && !rev->combine_merges) {
 376                         /* No "--first-parent", "-c", nor "--cc" */
 377                         rev->combine_merges = 1;
 378                         rev->dense_combined_merges = 1;
 379                 }
 380         }
 381         if (!rev->diffopt.output_format)
 382                 rev->diffopt.output_format = DIFF_FORMAT_PATCH;
 383 }
 384
 385 int cmd_show(int argc, const char **argv, const char *prefix)
 386 {
 387         struct rev_info rev;
 388         struct object_array_entry *objects;
 389         struct setup_revision_opt opt;
 390         int i, count, ret = 0;
 391
 392         git_config(git_log_config, NULL);
 393
 394         if (diff_use_color_default == -1)
 395                 diff_use_color_default = git_use_color_default;
 396
 397         init_revisions(&rev, prefix);
 398         rev.diff = 1;
 399         rev.always_show_header = 1;
 400         rev.no_walk = 1;
 401         memset(&opt, 0, sizeof(opt));
 402         opt.def = "HEAD";
 403         opt.tweak = show_rev_tweak_rev;
 404         cmd_log_init(argc, argv, prefix, &rev, &opt);
 405
 406         count = rev.pending.nr;
 407         objects = rev.pending.objects;
 408         for (i = 0; i < count && !ret; i++) {
 409                 struct object *o = objects[i].item;
 410                 const char *name = objects[i].name;
 411                 switch (o->type) {
 412                 case OBJ_BLOB:
 413                         ret = show_object(o->sha1, 0, NULL);
 414                         break;
 415                 case OBJ_TAG: {
 416                         struct tag *t = (struct tag *)o;
 417
 418                         if (rev.shown_one)
 419                                 putchar('\n');
 420                         printf("%stag %s%s\n",
 421                                         diff_get_color_opt(&rev.diffopt, DIFF_COMMIT),
 422                                         t->tag,
 423                                         diff_get_color_opt(&rev.diffopt, DIFF_RESET));
 424                         ret = show_object(o->sha1, 1, &rev);
 425                         rev.shown_one = 1;
 426                         if (ret)
 427                                 break;
 428                         o = parse_object(t->tagged->sha1);
 429                         if (!o)
 430                                 ret = error("Could not read object %s",
 431                                             sha1_to_hex(t->tagged->sha1));
 432                         objects[i].item = o;
 433                         i--;
 434                         break;
 435                 }
 436                 case OBJ_TREE:
 437                         if (rev.shown_one)
 438                                 putchar('\n');
 439                         printf("%stree %s%s\n\n",
 440                                         diff_get_color_opt(&rev.diffopt, DIFF_COMMIT),
 441                                         name,
 442                                         diff_get_color_opt(&rev.diffopt, DIFF_RESET));
 443                         read_tree_recursive((struct tree *)o, "", 0, 0, NULL,
 444                                         show_tree_object, NULL);
 445                         rev.shown_one = 1;
 446                         break;
 447                 case OBJ_COMMIT:
 448                         rev.pending.nr = rev.pending.alloc = 0;
 449                         rev.pending.objects = NULL;
 450                         add_object_array(o, name, &rev.pending);
 451                         ret = cmd_log_walk(&rev);
 452                         break;
 453                 default:
 454                         ret = error("Unknown type: %d", o->type);
 455                 }
 456         }
 457         free(objects);
 458         return ret;
 459 }
 460
 461 /*
 462  * This is equivalent to "git log -g --abbrev-commit --pretty=oneline"
 463  */
 464 int cmd_log_reflog(int argc, const char **argv, const char *prefix)
 465 {
 466         struct rev_info rev;
 467         struct setup_revision_opt opt;
 468
 469         git_config(git_log_config, NULL);
 470
 471         if (diff_use_color_default == -1)
 472                 diff_use_color_default = git_use_color_default;
 473
 474         init_revisions(&rev, prefix);
 475         init_reflog_walk(&rev.reflog_info);
 476         rev.abbrev_commit = 1;
 477         rev.verbose_header = 1;
 478         memset(&opt, 0, sizeof(opt));
 479         opt.def = "HEAD";
 480         cmd_log_init(argc, argv, prefix, &rev, &opt);
 481
 482         /*
 483          * This means that we override whatever commit format the user gave
 484          * on the cmd line.  Sad, but cmd_log_init() currently doesn't
 485          * allow us to set a different default.
 486          */
 487         rev.commit_format = CMIT_FMT_ONELINE;
 488         rev.use_terminator = 1;
 489         rev.always_show_header = 1;
 490
 491         /*
 492          * We get called through "git reflog", so unlike the other log
 493          * routines, we need to set up our pager manually..
 494          */
 495         setup_pager();
 496
 497         return cmd_log_walk(&rev);
 498 }
 499
 500 int cmd_log(int argc, const char **argv, const char *prefix)
 501 {
 502         struct rev_info rev;
 503         struct setup_revision_opt opt;
 504
 505         git_config(git_log_config, NULL);
 506
 507         if (diff_use_color_default == -1)
 508                 diff_use_color_default = git_use_color_default;
 509
 510         init_revisions(&rev, prefix);
 511         rev.always_show_header = 1;
 512         memset(&opt, 0, sizeof(opt));
 513         opt.def = "HEAD";
 514         cmd_log_init(argc, argv, prefix, &rev, &opt);
 515         return cmd_log_walk(&rev);
 516 }
 517
 518 /* format-patch */
 519
 520 static const char *fmt_patch_suffix = ".patch";
 521 static int numbered = 0;
 522 static int auto_number = 1;
 523
 524 static char *default_attach = NULL;
 525
 526 static struct string_list extra_hdr;
 527 static struct string_list extra_to;
 528 static struct string_list extra_cc;
 529
 530 static void add_header(const char *value)
 531 {
 532         struct string_list_item *item;
 533         int len = strlen(value);
 534         while (len && value[len - 1] == '\n')
 535                 len--;
 536
 537         if (!strncasecmp(value, "to: ", 4)) {
 538                 item = string_list_append(value + 4, &extra_to);
 539                 len -= 4;
 540         } else if (!strncasecmp(value, "cc: ", 4)) {
 541                 item = string_list_append(value + 4, &extra_cc);
 542                 len -= 4;
 543         } else {
 544                 item = string_list_append(value, &extra_hdr);
 545         }
 546
 547         item->string[len] = '\0';
 548 }
 549
 550 #define THREAD_SHALLOW 1
 551 #define THREAD_DEEP 2
 552 static int thread = 0;
 553 static int do_signoff = 0;
 554
 555 static int git_format_config(const char *var, const char *value, void *cb)
 556 {
 557         if (!strcmp(var, "format.headers")) {
 558                 if (!value)
 559                         die("format.headers without value");
 560                 add_header(value);
 561                 return 0;
 562         }
 563         if (!strcmp(var, "format.suffix"))
 564                 return git_config_string(&fmt_patch_suffix, var, value);
 565         if (!strcmp(var, "format.to")) {
 566                 if (!value)
 567                         return config_error_nonbool(var);
 568                 string_list_append(value, &extra_to);
 569                 return 0;
 570         }
 571         if (!strcmp(var, "format.cc")) {
 572                 if (!value)
 573                         return config_error_nonbool(var);
 574                 string_list_append(value, &extra_cc);
 575                 return 0;
 576         }
 577         if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
 578                 return 0;
 579         }
 580         if (!strcmp(var, "format.numbered")) {
 581                 if (value && !strcasecmp(value, "auto")) {
 582                         auto_number = 1;
 583                         return 0;
 584                 }
 585                 numbered = git_config_bool(var, value);
 586                 auto_number = auto_number && numbered;
 587                 return 0;
 588         }
 589         if (!strcmp(var, "format.attach")) {
 590                 if (value && *value)
 591                         default_attach = xstrdup(value);
 592                 else
 593                         default_attach = xstrdup(git_version_string);
 594                 return 0;
 595         }
 596         if (!strcmp(var, "format.thread")) {
 597                 if (value && !strcasecmp(value, "deep")) {
 598                         thread = THREAD_DEEP;
 599                         return 0;
 600                 }
 601                 if (value && !strcasecmp(value, "shallow")) {
 602                         thread = THREAD_SHALLOW;
 603                         return 0;
 604                 }
 605                 thread = git_config_bool(var, value) && THREAD_SHALLOW;
 606                 return 0;
 607         }
 608         if (!strcmp(var, "format.signoff")) {
 609                 do_signoff = git_config_bool(var, value);
 610                 return 0;
 611         }
 612
 613         return git_log_config(var, value, cb);
 614 }
 615
 616 static FILE *realstdout = NULL;
 617 static const char *output_directory = NULL;
 618 static int outdir_offset;
 619
 620 static int reopen_stdout(struct commit *commit, struct rev_info *rev)
 621 {
 622         struct strbuf filename = STRBUF_INIT;
 623         int suffix_len = strlen(fmt_patch_suffix) + 1;
 624
 625         if (output_directory) {
 626                 strbuf_addstr(&filename, output_directory);
 627                 if (filename.len >=
 628                     PATH_MAX - FORMAT_PATCH_NAME_MAX - suffix_len)
 629                         return error("name of output directory is too long");
 630                 if (filename.buf[filename.len - 1] != '/')
 631                         strbuf_addch(&filename, '/');
 632         }
 633
 634         get_patch_filename(commit, rev->nr, fmt_patch_suffix, &filename);
 635
 636         if (!DIFF_OPT_TST(&rev->diffopt, QUICK))
 637                 fprintf(realstdout, "%s\n", filename.buf + outdir_offset);
 638
 639         if (freopen(filename.buf, "w", stdout) == NULL)
 640                 return error("Cannot open patch file %s", filename.buf);
 641
 642         strbuf_release(&filename);
 643         return 0;
 644 }
 645
 646 static void get_patch_ids(struct rev_info *rev, struct patch_ids *ids, const char *prefix)
 647 {
 648         struct rev_info check_rev;
 649         struct commit *commit;
 650         struct object *o1, *o2;
 651         unsigned flags1, flags2;
 652
 653         if (rev->pending.nr != 2)
 654                 die("Need exactly one range.");
 655
 656         o1 = rev->pending.objects[0].item;
 657         flags1 = o1->flags;
 658         o2 = rev->pending.objects[1].item;
 659         flags2 = o2->flags;
 660
 661         if ((flags1 & UNINTERESTING) == (flags2 & UNINTERESTING))
 662                 die("Not a range.");
 663
 664         init_patch_ids(ids);
 665
 666         /* given a range a..b get all patch ids for b..a */
 667         init_revisions(&check_rev, prefix);
 668         o1->flags ^= UNINTERESTING;
 669         o2->flags ^= UNINTERESTING;
 670         add_pending_object(&check_rev, o1, "o1");
 671         add_pending_object(&check_rev, o2, "o2");
 672         if (prepare_revision_walk(&check_rev))
 673                 die("revision walk setup failed");
 674
 675         while ((commit = get_revision(&check_rev)) != NULL) {
 676                 /* ignore merges */
 677                 if (commit->parents && commit->parents->next)
 678                         continue;
 679
 680                 add_commit_patch_id(commit, ids);
 681         }
 682
 683         /* reset for next revision walk */
 684         clear_commit_marks((struct commit *)o1,
 685                         SEEN | UNINTERESTING | SHOWN | ADDED);
 686         clear_commit_marks((struct commit *)o2,
 687                         SEEN | UNINTERESTING | SHOWN | ADDED);
 688         o1->flags = flags1;
 689         o2->flags = flags2;
 690 }
 691
 692 static void gen_message_id(struct rev_info *info, char *base)
 693 {
 694         const char *committer = git_committer_info(IDENT_WARN_ON_NO_NAME);
 695         const char *email_start = strrchr(committer, '<');
 696         const char *email_end = strrchr(committer, '>');
 697         struct strbuf buf = STRBUF_INIT;
 698         if (!email_start || !email_end || email_start > email_end - 1)
 699                 die("Could not extract email from committer identity.");
 700         strbuf_addf(&buf, "%s.%lu.git.%.*s", base,
 701                     (unsigned long) time(NULL),
 702                     (int)(email_end - email_start - 1), email_start + 1);
 703         info->message_id = strbuf_detach(&buf, NULL);
 704 }
 705
 706 static void make_cover_letter(struct rev_info *rev, int use_stdout,
 707                               int numbered, int numbered_files,
 708                               struct commit *origin,
 709                               int nr, struct commit **list, struct commit *head)
 710 {
 711         const char *committer;
 712         const char *subject_start = NULL;
 713         const char *body = "*** SUBJECT HERE ***\n\n*** BLURB HERE ***\n";
 714         const char *msg;
 715         const char *extra_headers = rev->extra_headers;
 716         struct shortlog log;
 717         struct strbuf sb = STRBUF_INIT;
 718         int i;
 719         const char *encoding = "UTF-8";
 720         struct diff_options opts;
 721         int need_8bit_cte = 0;
 722         struct commit *commit = NULL;
 723
 724         if (rev->commit_format != CMIT_FMT_EMAIL)
 725                 die("Cover letter needs email format");
 726
 727         committer = git_committer_info(0);
 728
 729         if (!numbered_files) {
 730                 /*
 731                  * We fake a commit for the cover letter so we get the filename
 732                  * desired.
 733                  */
 734                 commit = xcalloc(1, sizeof(*commit));
 735                 commit->buffer = xmalloc(400);
 736                 snprintf(commit->buffer, 400,
 737                         "tree 0000000000000000000000000000000000000000\n"
 738                         "parent %s\n"
 739                         "author %s\n"
 740                         "committer %s\n\n"
 741                         "cover letter\n",
 742                         sha1_to_hex(head->object.sha1), committer, committer);
 743         }
 744
 745         if (!use_stdout && reopen_stdout(commit, rev))
 746                 return;
 747
 748         if (commit) {
 749
 750                 free(commit->buffer);
 751                 free(commit);
 752         }
 753
 754         log_write_email_headers(rev, head, &subject_start, &extra_headers,
 755                                 &need_8bit_cte);
 756
 757         for (i = 0; !need_8bit_cte && i < nr; i++)
 758                 if (has_non_ascii(list[i]->buffer))
 759                         need_8bit_cte = 1;
 760
 761         msg = body;
 762         pp_user_info(NULL, CMIT_FMT_EMAIL, &sb, committer, DATE_RFC2822,
 763                      encoding);
 764         pp_title_line(CMIT_FMT_EMAIL, &msg, &sb, subject_start, extra_headers,
 765                       encoding, need_8bit_cte);
 766         pp_remainder(CMIT_FMT_EMAIL, &msg, &sb, 0);
 767         printf("%s\n", sb.buf);
 768
 769         strbuf_release(&sb);
 770
 771         shortlog_init(&log);
 772         log.wrap_lines = 1;
 773         log.wrap = 72;
 774         log.in1 = 2;
 775         log.in2 = 4;
 776         for (i = 0; i < nr; i++)
 777                 shortlog_add_commit(&log, list[i]);
 778
 779         shortlog_output(&log);
 780
 781         /*
 782          * We can only do diffstat with a unique reference point
 783          */
 784         if (!origin)
 785                 return;
 786
 787         memcpy(&opts, &rev->diffopt, sizeof(opts));
 788         opts.output_format = DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT;
 789
 790         diff_setup_done(&opts);
 791
 792         diff_tree_sha1(origin->tree->object.sha1,
 793                        head->tree->object.sha1,
 794                        "", &opts);
 795         diffcore_std(&opts);
 796         diff_flush(&opts);
 797
 798         printf("\n");
 799 }
 800
 801 static const char *clean_message_id(const char *msg_id)
 802 {
 803         char ch;
 804         const char *a, *z, *m;
 805
 806         m = msg_id;
 807         while ((ch = *m) && (isspace(ch) || (ch == '<')))
 808                 m++;
 809         a = m;
 810         z = NULL;
 811         while ((ch = *m)) {
 812                 if (!isspace(ch) && (ch != '>'))
 813                         z = m;
 814                 m++;
 815         }
 816         if (!z)
 817                 die("insane in-reply-to: %s", msg_id);
 818         if (++z == m)
 819                 return a;
 820         return xmemdupz(a, z - a);
 821 }
 822
 823 static const char *set_outdir(const char *prefix, const char *output_directory)
 824 {
 825         if (output_directory && is_absolute_path(output_directory))
 826                 return output_directory;
 827
 828         if (!prefix || !*prefix) {
 829                 if (output_directory)
 830                         return output_directory;
 831                 /* The user did not explicitly ask for "./" */
 832                 outdir_offset = 2;
 833                 return "./";
 834         }
 835
 836         outdir_offset = strlen(prefix);
 837         if (!output_directory)
 838                 return prefix;
 839
 840         return xstrdup(prefix_filename(prefix, outdir_offset,
 841                                        output_directory));
 842 }
 843
 844 static const char * const builtin_format_patch_usage[] = {
 845         "git format-patch [options] [<since> | <revision range>]",
 846         NULL
 847 };
 848
 849 static int keep_subject = 0;
 850
 851 static int keep_callback(const struct option *opt, const char *arg, int unset)
 852 {
 853         ((struct rev_info *)opt->value)->total = -1;
 854         keep_subject = 1;
 855         return 0;
 856 }
 857
 858 static int subject_prefix = 0;
 859
 860 static int subject_prefix_callback(const struct option *opt, const char *arg,
 861                             int unset)
 862 {
 863         subject_prefix = 1;
 864         ((struct rev_info *)opt->value)->subject_prefix = arg;
 865         return 0;
 866 }
 867
 868 static int numbered_cmdline_opt = 0;
 869
 870 static int numbered_callback(const struct option *opt, const char *arg,
 871                              int unset)
 872 {
 873         *(int *)opt->value = numbered_cmdline_opt = unset ? 0 : 1;
 874         if (unset)
 875                 auto_number =  0;
 876         return 0;
 877 }
 878
 879 static int no_numbered_callback(const struct option *opt, const char *arg,
 880                                 int unset)
 881 {
 882         return numbered_callback(opt, arg, 1);
 883 }
 884
 885 static int output_directory_callback(const struct option *opt, const char *arg,
 886                               int unset)
 887 {
 888         const char **dir = (const char **)opt->value;
 889         if (*dir)
 890                 die("Two output directories?");
 891         *dir = arg;
 892         return 0;
 893 }
 894
 895 static int thread_callback(const struct option *opt, const char *arg, int unset)
 896 {
 897         int *thread = (int *)opt->value;
 898         if (unset)
 899                 *thread = 0;
 900         else if (!arg || !strcmp(arg, "shallow"))
 901                 *thread = THREAD_SHALLOW;
 902         else if (!strcmp(arg, "deep"))
 903                 *thread = THREAD_DEEP;
 904         else
 905                 return 1;
 906         return 0;
 907 }
 908
 909 static int attach_callback(const struct option *opt, const char *arg, int unset)
 910 {
 911         struct rev_info *rev = (struct rev_info *)opt->value;
 912         if (unset)
 913                 rev->mime_boundary = NULL;
 914         else if (arg)
 915                 rev->mime_boundary = arg;
 916         else
 917                 rev->mime_boundary = git_version_string;
 918         rev->no_inline = unset ? 0 : 1;
 919         return 0;
 920 }
 921
 922 static int inline_callback(const struct option *opt, const char *arg, int unset)
 923 {
 924         struct rev_info *rev = (struct rev_info *)opt->value;
 925         if (unset)
 926                 rev->mime_boundary = NULL;
 927         else if (arg)
 928                 rev->mime_boundary = arg;
 929         else
 930                 rev->mime_boundary = git_version_string;
 931         rev->no_inline = 0;
 932         return 0;
 933 }
 934
 935 static int header_callback(const struct option *opt, const char *arg, int unset)
 936 {
 937         if (unset) {
 938                 string_list_clear(&extra_hdr, 0);
 939                 string_list_clear(&extra_to, 0);
 940                 string_list_clear(&extra_cc, 0);
 941         } else {
 942             add_header(arg);
 943         }
 944         return 0;
 945 }
 946
 947 static int to_callback(const struct option *opt, const char *arg, int unset)
 948 {
 949         if (unset)
 950                 string_list_clear(&extra_to, 0);
 951         else
 952                 string_list_append(arg, &extra_to);
 953         return 0;
 954 }
 955
 956 static int cc_callback(const struct option *opt, const char *arg, int unset)
 957 {
 958         if (unset)
 959                 string_list_clear(&extra_cc, 0);
 960         else
 961                 string_list_append(arg, &extra_cc);
 962         return 0;
 963 }
 964
 965 int cmd_format_patch(int argc, const char **argv, const char *prefix)
 966 {
 967         struct commit *commit;
 968         struct commit **list = NULL;
 969         struct rev_info rev;
 970         struct setup_revision_opt s_r_opt;
 971         int nr = 0, total, i;
 972         int use_stdout = 0;
 973         int start_number = -1;
 974         int numbered_files = 0;         /* _just_ numbers */
 975         int ignore_if_in_upstream = 0;
 976         int cover_letter = 0;
 977         int boundary_count = 0;
 978         int no_binary_diff = 0;
 979         struct commit *origin = NULL, *head = NULL;
 980         const char *in_reply_to = NULL;
 981         struct patch_ids ids;
 982         char *add_signoff = NULL;
 983         struct strbuf buf = STRBUF_INIT;
 984         int use_patch_format = 0;
 985         const struct option builtin_format_patch_options[] = {
 986                 { OPTION_CALLBACK, 'n', "numbered", &numbered, NULL,
 987                             "use [PATCH n/m] even with a single patch",
 988                             PARSE_OPT_NOARG, numbered_callback },
 989                 { OPTION_CALLBACK, 'N', "no-numbered", &numbered, NULL,
 990                             "use [PATCH] even with multiple patches",
 991                             PARSE_OPT_NOARG, no_numbered_callback },
 992                 OPT_BOOLEAN('s', "signoff", &do_signoff, "add Signed-off-by:"),
 993                 OPT_BOOLEAN(0, "stdout", &use_stdout,
 994                             "print patches to standard out"),
 995                 OPT_BOOLEAN(0, "cover-letter", &cover_letter,
 996                             "generate a cover letter"),
 997                 OPT_BOOLEAN(0, "numbered-files", &numbered_files,
 998                             "use simple number sequence for output file names"),
 999                 OPT_STRING(0, "suffix", &fmt_patch_suffix, "sfx",
1000                             "use <sfx> instead of '.patch'"),
1001                 OPT_INTEGER(0, "start-number", &start_number,
1002                             "start numbering patches at <n> instead of 1"),
1003                 { OPTION_CALLBACK, 0, "subject-prefix", &rev, "prefix",
1004                             "Use [<prefix>] instead of [PATCH]",
1005                             PARSE_OPT_NONEG, subject_prefix_callback },
1006                 { OPTION_CALLBACK, 'o', "output-directory", &output_directory,
1007                             "dir", "store resulting files in <dir>",
1008                             PARSE_OPT_NONEG, output_directory_callback },
1009                 { OPTION_CALLBACK, 'k', "keep-subject", &rev, NULL,
1010                             "don't strip/add [PATCH]",
1011                             PARSE_OPT_NOARG | PARSE_OPT_NONEG, keep_callback },
1012                 OPT_BOOLEAN(0, "no-binary", &no_binary_diff,
1013                             "don't output binary diffs"),
1014                 OPT_BOOLEAN(0, "ignore-if-in-upstream", &ignore_if_in_upstream,
1015                             "don't include a patch matching a commit upstream"),
1016                 { OPTION_BOOLEAN, 'p', "no-stat", &use_patch_format, NULL,
1017                   "show patch format instead of default (patch + stat)",
1018                   PARSE_OPT_NONEG | PARSE_OPT_NOARG },
1019                 OPT_GROUP("Messaging"),
1020                 { OPTION_CALLBACK, 0, "add-header", NULL, "header",
1021                             "add email header", 0, header_callback },
1022                 { OPTION_CALLBACK, 0, "to", NULL, "email", "add To: header",
1023                             0, to_callback },
1024                 { OPTION_CALLBACK, 0, "cc", NULL, "email", "add Cc: header",
1025                             0, cc_callback },
1026                 OPT_STRING(0, "in-reply-to", &in_reply_to, "message-id",
1027                             "make first mail a reply to <message-id>"),
1028                 { OPTION_CALLBACK, 0, "attach", &rev, "boundary",
1029                             "attach the patch", PARSE_OPT_OPTARG,
1030                             attach_callback },
1031                 { OPTION_CALLBACK, 0, "inline", &rev, "boundary",
1032                             "inline the patch",
1033                             PARSE_OPT_OPTARG | PARSE_OPT_NONEG,
1034                             inline_callback },
1035                 { OPTION_CALLBACK, 0, "thread", &thread, "style",
1036                             "enable message threading, styles: shallow, deep",
1037                             PARSE_OPT_OPTARG, thread_callback },
1038                 OPT_END()
1039         };
1040
1041         extra_hdr.strdup_strings = 1;
1042         extra_to.strdup_strings = 1;
1043         extra_cc.strdup_strings = 1;
1044         git_config(git_format_config, NULL);
1045         init_revisions(&rev, prefix);
1046         rev.commit_format = CMIT_FMT_EMAIL;
1047         rev.verbose_header = 1;
1048         rev.diff = 1;
1049         rev.combine_merges = 0;
1050         rev.ignore_merges = 1;
1051         DIFF_OPT_SET(&rev.diffopt, RECURSIVE);
1052         rev.subject_prefix = fmt_patch_subject_prefix;
1053         memset(&s_r_opt, 0, sizeof(s_r_opt));
1054         s_r_opt.def = "HEAD";
1055
1056         if (default_attach) {
1057                 rev.mime_boundary = default_attach;
1058                 rev.no_inline = 1;
1059         }
1060
1061         /*
1062          * Parse the arguments before setup_revisions(), or something
1063          * like "git format-patch -o a123 HEAD^.." may fail; a123 is
1064          * possibly a valid SHA1.
1065          */
1066         argc = parse_options(argc, argv, prefix, builtin_format_patch_options,
1067                              builtin_format_patch_usage,
1068                              PARSE_OPT_KEEP_ARGV0 | PARSE_OPT_KEEP_UNKNOWN |
1069                              PARSE_OPT_KEEP_DASHDASH);
1070
1071         if (do_signoff) {
1072                 const char *committer;
1073                 const char *endpos;
1074                 committer = git_committer_info(IDENT_ERROR_ON_NO_NAME);
1075                 endpos = strchr(committer, '>');
1076                 if (!endpos)
1077                         die("bogus committer info %s", committer);
1078                 add_signoff = xmemdupz(committer, endpos - committer + 1);
1079         }
1080
1081         for (i = 0; i < extra_hdr.nr; i++) {
1082                 strbuf_addstr(&buf, extra_hdr.items[i].string);
1083                 strbuf_addch(&buf, '\n');
1084         }
1085
1086         if (extra_to.nr)
1087                 strbuf_addstr(&buf, "To: ");
1088         for (i = 0; i < extra_to.nr; i++) {
1089                 if (i)
1090                         strbuf_addstr(&buf, "    ");
1091                 strbuf_addstr(&buf, extra_to.items[i].string);
1092                 if (i + 1 < extra_to.nr)
1093                         strbuf_addch(&buf, ',');
1094                 strbuf_addch(&buf, '\n');
1095         }
1096
1097         if (extra_cc.nr)
1098                 strbuf_addstr(&buf, "Cc: ");
1099         for (i = 0; i < extra_cc.nr; i++) {
1100                 if (i)
1101                         strbuf_addstr(&buf, "    ");
1102                 strbuf_addstr(&buf, extra_cc.items[i].string);
1103                 if (i + 1 < extra_cc.nr)
1104                         strbuf_addch(&buf, ',');
1105                 strbuf_addch(&buf, '\n');
1106         }
1107
1108         rev.extra_headers = strbuf_detach(&buf, NULL);
1109
1110         if (start_number < 0)
1111                 start_number = 1;
1112
1113         /*
1114          * If numbered is set solely due to format.numbered in config,
1115          * and it would conflict with --keep-subject (-k) from the
1116          * command line, reset "numbered".
1117          */
1118         if (numbered && keep_subject && !numbered_cmdline_opt)
1119                 numbered = 0;
1120
1121         if (numbered && keep_subject)
1122                 die ("-n and -k are mutually exclusive.");
1123         if (keep_subject && subject_prefix)
1124                 die ("--subject-prefix and -k are mutually exclusive.");
1125
1126         argc = setup_revisions(argc, argv, &rev, &s_r_opt);
1127         if (argc > 1)
1128                 die ("unrecognized argument: %s", argv[1]);
1129
1130         if (rev.diffopt.output_format & DIFF_FORMAT_NAME)
1131                 die("--name-only does not make sense");
1132         if (rev.diffopt.output_format & DIFF_FORMAT_NAME_STATUS)
1133                 die("--name-status does not make sense");
1134         if (rev.diffopt.output_format & DIFF_FORMAT_CHECKDIFF)
1135                 die("--check does not make sense");
1136
1137         if (!use_patch_format &&
1138                 (!rev.diffopt.output_format ||
1139                  rev.diffopt.output_format == DIFF_FORMAT_PATCH))
1140                 rev.diffopt.output_format = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_SUMMARY;
1141
1142         /* Always generate a patch */
1143         rev.diffopt.output_format |= DIFF_FORMAT_PATCH;
1144
1145         if (!DIFF_OPT_TST(&rev.diffopt, TEXT) && !no_binary_diff)
1146                 DIFF_OPT_SET(&rev.diffopt, BINARY);
1147
1148         if (rev.show_notes)
1149                 init_display_notes(&rev.notes_opt);
1150
1151         if (!use_stdout)
1152                 output_directory = set_outdir(prefix, output_directory);
1153
1154         if (output_directory) {
1155                 if (use_stdout)
1156                         die("standard output, or directory, which one?");
1157                 if (mkdir(output_directory, 0777) < 0 && errno != EEXIST)
1158                         die_errno("Could not create directory '%s'",
1159                                   output_directory);
1160         }
1161
1162         if (rev.pending.nr == 1) {
1163                 if (rev.max_count < 0 && !rev.show_root_diff) {
1164                         /*
1165                          * This is traditional behaviour of "git format-patch
1166                          * origin" that prepares what the origin side still
1167                          * does not have.
1168                          */
1169                         rev.pending.objects[0].item->flags |= UNINTERESTING;
1170                         add_head_to_pending(&rev);
1171                 }
1172                 /*
1173                  * Otherwise, it is "format-patch -22 HEAD", and/or
1174                  * "format-patch --root HEAD".  The user wants
1175                  * get_revision() to do the usual traversal.
1176                  */
1177         }
1178
1179         /*
1180          * We cannot move this anywhere earlier because we do want to
1181          * know if --root was given explicitly from the command line.
1182          */
1183         rev.show_root_diff = 1;
1184
1185         if (cover_letter) {
1186                 /* remember the range */
1187                 int i;
1188                 for (i = 0; i < rev.pending.nr; i++) {
1189                         struct object *o = rev.pending.objects[i].item;
1190                         if (!(o->flags & UNINTERESTING))
1191                                 head = (struct commit *)o;
1192                 }
1193                 /* We can't generate a cover letter without any patches */
1194                 if (!head)
1195                         return 0;
1196         }
1197
1198         if (ignore_if_in_upstream) {
1199                 /* Don't say anything if head and upstream are the same. */
1200                 if (rev.pending.nr == 2) {
1201                         struct object_array_entry *o = rev.pending.objects;
1202                         if (hashcmp(o[0].item->sha1, o[1].item->sha1) == 0)
1203                                 return 0;
1204                 }
1205                 get_patch_ids(&rev, &ids, prefix);
1206         }
1207
1208         if (!use_stdout)
1209                 realstdout = xfdopen(xdup(1), "w");
1210
1211         if (prepare_revision_walk(&rev))
1212                 die("revision walk setup failed");
1213         rev.boundary = 1;
1214         while ((commit = get_revision(&rev)) != NULL) {
1215                 if (commit->object.flags & BOUNDARY) {
1216                         boundary_count++;
1217                         origin = (boundary_count == 1) ? commit : NULL;
1218                         continue;
1219                 }
1220
1221                 /* ignore merges */
1222                 if (commit->parents && commit->parents->next)
1223                         continue;
1224
1225                 if (ignore_if_in_upstream &&
1226                                 has_commit_patch_id(commit, &ids))
1227                         continue;
1228
1229                 nr++;
1230                 list = xrealloc(list, nr * sizeof(list[0]));
1231                 list[nr - 1] = commit;
1232         }
1233         total = nr;
1234         if (!keep_subject && auto_number && total > 1)
1235                 numbered = 1;
1236         if (numbered)
1237                 rev.total = total + start_number - 1;
1238         if (in_reply_to || thread || cover_letter)
1239                 rev.ref_message_ids = xcalloc(1, sizeof(struct string_list));
1240         if (in_reply_to) {
1241                 const char *msgid = clean_message_id(in_reply_to);
1242                 string_list_append(msgid, rev.ref_message_ids);
1243         }
1244         rev.numbered_files = numbered_files;
1245         rev.patch_suffix = fmt_patch_suffix;
1246         if (cover_letter) {
1247                 if (thread)
1248                         gen_message_id(&rev, "cover");
1249                 make_cover_letter(&rev, use_stdout, numbered, numbered_files,
1250                                   origin, nr, list, head);
1251                 total++;
1252                 start_number--;
1253         }
1254         rev.add_signoff = add_signoff;
1255         while (0 <= --nr) {
1256                 int shown;
1257                 commit = list[nr];
1258                 rev.nr = total - nr + (start_number - 1);
1259                 /* Make the second and subsequent mails replies to the first */
1260                 if (thread) {
1261                         /* Have we already had a message ID? */
1262                         if (rev.message_id) {
1263                                 /*
1264                                  * For deep threading: make every mail
1265                                  * a reply to the previous one, no
1266                                  * matter what other options are set.
1267                                  *
1268                                  * For shallow threading:
1269                                  *
1270                                  * Without --cover-letter and
1271                                  * --in-reply-to, make every mail a
1272                                  * reply to the one before.
1273                                  *
1274                                  * With --in-reply-to but no
1275                                  * --cover-letter, make every mail a
1276                                  * reply to the <reply-to>.
1277                                  *
1278                                  * With --cover-letter, make every
1279                                  * mail but the cover letter a reply
1280                                  * to the cover letter.  The cover
1281                                  * letter is a reply to the
1282                                  * --in-reply-to, if specified.
1283                                  */
1284                                 if (thread == THREAD_SHALLOW
1285                                     && rev.ref_message_ids->nr > 0
1286                                     && (!cover_letter || rev.nr > 1))
1287                                         free(rev.message_id);
1288                                 else
1289                                         string_list_append(rev.message_id,
1290                                                            rev.ref_message_ids);
1291                         }
1292                         gen_message_id(&rev, sha1_to_hex(commit->object.sha1));
1293                 }
1294
1295                 if (!use_stdout && reopen_stdout(numbered_files ? NULL : commit,
1296                                                  &rev))
1297                         die("Failed to create output files");
1298                 shown = log_tree_commit(&rev, commit);
1299                 free(commit->buffer);
1300                 commit->buffer = NULL;
1301
1302                 /* We put one extra blank line between formatted
1303                  * patches and this flag is used by log-tree code
1304                  * to see if it needs to emit a LF before showing
1305                  * the log; when using one file per patch, we do
1306                  * not want the extra blank line.
1307                  */
1308                 if (!use_stdout)
1309                         rev.shown_one = 0;
1310                 if (shown) {
1311                         if (rev.mime_boundary)
1312                                 printf("\n--%s%s--\n\n\n",
1313                                        mime_boundary_leader,
1314                                        rev.mime_boundary);
1315                         else
1316                                 printf("-- \n%s\n\n", git_version_string);
1317                 }
1318                 if (!use_stdout)
1319                         fclose(stdout);
1320         }
1321         free(list);
1322         string_list_clear(&extra_to, 0);
1323         string_list_clear(&extra_cc, 0);
1324         string_list_clear(&extra_hdr, 0);
1325         if (ignore_if_in_upstream)
1326                 free_patch_ids(&ids);
1327         return 0;
1328 }
1329
1330 static int add_pending_commit(const char *arg, struct rev_info *revs, int flags)
1331 {
1332         unsigned char sha1[20];
1333         if (get_sha1(arg, sha1) == 0) {
1334                 struct commit *commit = lookup_commit_reference(sha1);
1335                 if (commit) {
1336                         commit->object.flags |= flags;
1337                         add_pending_object(revs, &commit->object, arg);
1338                         return 0;
1339                 }
1340         }
1341         return -1;
1342 }
1343
1344 static const char * const cherry_usage[] = {
1345         "git cherry [-v] [<upstream> [<head> [<limit>]]]",
1346         NULL
1347 };
1348
1349 int cmd_cherry(int argc, const char **argv, const char *prefix)
1350 {
1351         struct rev_info revs;
1352         struct patch_ids ids;
1353         struct commit *commit;
1354         struct commit_list *list = NULL;
1355         struct branch *current_branch;
1356         const char *upstream;
1357         const char *head = "HEAD";
1358         const char *limit = NULL;
1359         int verbose = 0, abbrev = 0;
1360
1361         struct option options[] = {
1362                 OPT__ABBREV(&abbrev),
1363                 OPT__VERBOSE(&verbose),
1364                 OPT_END()
1365         };
1366
1367         argc = parse_options(argc, argv, prefix, options, cherry_usage, 0);
1368
1369         switch (argc) {
1370         case 3:
1371                 limit = argv[2];
1372                 /* FALLTHROUGH */
1373         case 2:
1374                 head = argv[1];
1375                 /* FALLTHROUGH */
1376         case 1:
1377                 upstream = argv[0];
1378                 break;
1379         default:
1380                 current_branch = branch_get(NULL);
1381                 if (!current_branch || !current_branch->merge
1382                                         || !current_branch->merge[0]
1383                                         || !current_branch->merge[0]->dst) {
1384                         fprintf(stderr, "Could not find a tracked"
1385                                         " remote branch, please"
1386                                         " specify <upstream> manually.\n");
1387                         usage_with_options(cherry_usage, options);
1388                 }
1389
1390                 upstream = current_branch->merge[0]->dst;
1391         }
1392
1393         init_revisions(&revs, prefix);
1394         revs.diff = 1;
1395         revs.combine_merges = 0;
1396         revs.ignore_merges = 1;
1397         DIFF_OPT_SET(&revs.diffopt, RECURSIVE);
1398
1399         if (add_pending_commit(head, &revs, 0))
1400                 die("Unknown commit %s", head);
1401         if (add_pending_commit(upstream, &revs, UNINTERESTING))
1402                 die("Unknown commit %s", upstream);
1403
1404         /* Don't say anything if head and upstream are the same. */
1405         if (revs.pending.nr == 2) {
1406                 struct object_array_entry *o = revs.pending.objects;
1407                 if (hashcmp(o[0].item->sha1, o[1].item->sha1) == 0)
1408                         return 0;
1409         }
1410
1411         get_patch_ids(&revs, &ids, prefix);
1412
1413         if (limit && add_pending_commit(limit, &revs, UNINTERESTING))
1414                 die("Unknown commit %s", limit);
1415
1416         /* reverse the list of commits */
1417         if (prepare_revision_walk(&revs))
1418                 die("revision walk setup failed");
1419         while ((commit = get_revision(&revs)) != NULL) {
1420                 /* ignore merges */
1421                 if (commit->parents && commit->parents->next)
1422                         continue;
1423
1424                 commit_list_insert(commit, &list);
1425         }
1426
1427         while (list) {
1428                 char sign = '+';
1429
1430                 commit = list->item;
1431                 if (has_commit_patch_id(commit, &ids))
1432                         sign = '-';
1433
1434                 if (verbose) {
1435                         struct strbuf buf = STRBUF_INIT;
1436                         struct pretty_print_context ctx = {0};
1437                         pretty_print_commit(CMIT_FMT_ONELINE, commit,
1438                                             &buf, &ctx);
1439                         printf("%c %s %s\n", sign,
1440                                find_unique_abbrev(commit->object.sha1, abbrev),
1441                                buf.buf);
1442                         strbuf_release(&buf);
1443                 }
1444                 else {
1445                         printf("%c %s\n", sign,
1446                                find_unique_abbrev(commit->object.sha1, abbrev));
1447                 }
1448
1449                 list = list->next;
1450         }
1451
1452         free_patch_ids(&ids);
1453         return 0;
1454 }