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 #include "branch.h"
  23 #include "streaming.h"
  24 #include "version.h"
  25
  26 /* Set a default date-time format for git log ("log.date" config variable) */
  27 static const char *default_date_mode = NULL;
  28
  29 static int default_abbrev_commit;
  30 static int default_show_root = 1;
  31 static int decoration_style;
  32 static int decoration_given;
  33 static const char *fmt_patch_subject_prefix = "PATCH";
  34 static const char *fmt_pretty;
  35
  36 static const char * const builtin_log_usage[] = {
  37         "git log [<options>] [<since>..<until>] [[--] <path>...]\n"
  38         "   or: git show [options] <object>...",
  39         NULL
  40 };
  41
  42 static int parse_decoration_style(const char *var, const char *value)
  43 {
  44         switch (git_config_maybe_bool(var, value)) {
  45         case 1:
  46                 return DECORATE_SHORT_REFS;
  47         case 0:
  48                 return 0;
  49         default:
  50                 break;
  51         }
  52         if (!strcmp(value, "full"))
  53                 return DECORATE_FULL_REFS;
  54         else if (!strcmp(value, "short"))
  55                 return DECORATE_SHORT_REFS;
  56         return -1;
  57 }
  58
  59 static int decorate_callback(const struct option *opt, const char *arg, int unset)
  60 {
  61         if (unset)
  62                 decoration_style = 0;
  63         else if (arg)
  64                 decoration_style = parse_decoration_style("command line", arg);
  65         else
  66                 decoration_style = DECORATE_SHORT_REFS;
  67
  68         if (decoration_style < 0)
  69                 die("invalid --decorate option: %s", arg);
  70
  71         decoration_given = 1;
  72
  73         return 0;
  74 }
  75
  76 static void cmd_log_init_defaults(struct rev_info *rev)
  77 {
  78         if (fmt_pretty)
  79                 get_commit_format(fmt_pretty, rev);
  80         rev->verbose_header = 1;
  81         DIFF_OPT_SET(&rev->diffopt, RECURSIVE);
  82         rev->diffopt.stat_width = -1; /* use full terminal width */
  83         rev->diffopt.stat_graph_width = -1; /* respect statGraphWidth config */
  84         rev->abbrev_commit = default_abbrev_commit;
  85         rev->show_root_diff = default_show_root;
  86         rev->subject_prefix = fmt_patch_subject_prefix;
  87         DIFF_OPT_SET(&rev->diffopt, ALLOW_TEXTCONV);
  88
  89         if (default_date_mode)
  90                 rev->date_mode = parse_date_format(default_date_mode);
  91 }
  92
  93 static void cmd_log_init_finish(int argc, const char **argv, const char *prefix,
  94                          struct rev_info *rev, struct setup_revision_opt *opt)
  95 {
  96         struct userformat_want w;
  97         int quiet = 0, source = 0;
  98
  99         const struct option builtin_log_options[] = {
 100                 OPT_BOOLEAN(0, "quiet", &quiet, "suppress diff output"),
 101                 OPT_BOOLEAN(0, "source", &source, "show source"),
 102                 { OPTION_CALLBACK, 0, "decorate", NULL, NULL, "decorate options",
 103                   PARSE_OPT_OPTARG, decorate_callback},
 104                 OPT_END()
 105         };
 106
 107         argc = parse_options(argc, argv, prefix,
 108                              builtin_log_options, builtin_log_usage,
 109                              PARSE_OPT_KEEP_ARGV0 | PARSE_OPT_KEEP_UNKNOWN |
 110                              PARSE_OPT_KEEP_DASHDASH);
 111
 112         argc = setup_revisions(argc, argv, rev, opt);
 113         if (quiet)
 114                 rev->diffopt.output_format |= DIFF_FORMAT_NO_OUTPUT;
 115
 116         /* Any arguments at this point are not recognized */
 117         if (argc > 1)
 118                 die("unrecognized argument: %s", argv[1]);
 119
 120         memset(&w, 0, sizeof(w));
 121         userformat_find_requirements(NULL, &w);
 122
 123         if (!rev->show_notes_given && (!rev->pretty_given || w.notes))
 124                 rev->show_notes = 1;
 125         if (rev->show_notes)
 126                 init_display_notes(&rev->notes_opt);
 127
 128         if (rev->diffopt.pickaxe || rev->diffopt.filter)
 129                 rev->always_show_header = 0;
 130         if (DIFF_OPT_TST(&rev->diffopt, FOLLOW_RENAMES)) {
 131                 rev->always_show_header = 0;
 132                 if (rev->diffopt.pathspec.nr != 1)
 133                         usage("git logs can only follow renames on one pathname at a time");
 134         }
 135
 136         if (source)
 137                 rev->show_source = 1;
 138
 139         if (rev->pretty_given && rev->commit_format == CMIT_FMT_RAW) {
 140                 /*
 141                  * "log --pretty=raw" is special; ignore UI oriented
 142                  * configuration variables such as decoration.
 143                  */
 144                 if (!decoration_given)
 145                         decoration_style = 0;
 146                 if (!rev->abbrev_commit_given)
 147                         rev->abbrev_commit = 0;
 148         }
 149
 150         if (decoration_style) {
 151                 rev->show_decorations = 1;
 152                 load_ref_decorations(decoration_style);
 153         }
 154         setup_pager();
 155 }
 156
 157 static void cmd_log_init(int argc, const char **argv, const char *prefix,
 158                          struct rev_info *rev, struct setup_revision_opt *opt)
 159 {
 160         cmd_log_init_defaults(rev);
 161         cmd_log_init_finish(argc, argv, prefix, rev, opt);
 162 }
 163
 164 /*
 165  * This gives a rough estimate for how many commits we
 166  * will print out in the list.
 167  */
 168 static int estimate_commit_count(struct rev_info *rev, struct commit_list *list)
 169 {
 170         int n = 0;
 171
 172         while (list) {
 173                 struct commit *commit = list->item;
 174                 unsigned int flags = commit->object.flags;
 175                 list = list->next;
 176                 if (!(flags & (TREESAME | UNINTERESTING)))
 177                         n++;
 178         }
 179         return n;
 180 }
 181
 182 static void show_early_header(struct rev_info *rev, const char *stage, int nr)
 183 {
 184         if (rev->shown_one) {
 185                 rev->shown_one = 0;
 186                 if (rev->commit_format != CMIT_FMT_ONELINE)
 187                         putchar(rev->diffopt.line_termination);
 188         }
 189         printf(_("Final output: %d %s\n"), nr, stage);
 190 }
 191
 192 static struct itimerval early_output_timer;
 193
 194 static void log_show_early(struct rev_info *revs, struct commit_list *list)
 195 {
 196         int i = revs->early_output;
 197         int show_header = 1;
 198
 199         sort_in_topological_order(&list, revs->lifo);
 200         while (list && i) {
 201                 struct commit *commit = list->item;
 202                 switch (simplify_commit(revs, commit)) {
 203                 case commit_show:
 204                         if (show_header) {
 205                                 int n = estimate_commit_count(revs, list);
 206                                 show_early_header(revs, "incomplete", n);
 207                                 show_header = 0;
 208                         }
 209                         log_tree_commit(revs, commit);
 210                         i--;
 211                         break;
 212                 case commit_ignore:
 213                         break;
 214                 case commit_error:
 215                         return;
 216                 }
 217                 list = list->next;
 218         }
 219
 220         /* Did we already get enough commits for the early output? */
 221         if (!i)
 222                 return;
 223
 224         /*
 225          * ..if no, then repeat it twice a second until we
 226          * do.
 227          *
 228          * NOTE! We don't use "it_interval", because if the
 229          * reader isn't listening, we want our output to be
 230          * throttled by the writing, and not have the timer
 231          * trigger every second even if we're blocked on a
 232          * reader!
 233          */
 234         early_output_timer.it_value.tv_sec = 0;
 235         early_output_timer.it_value.tv_usec = 500000;
 236         setitimer(ITIMER_REAL, &early_output_timer, NULL);
 237 }
 238
 239 static void early_output(int signal)
 240 {
 241         show_early_output = log_show_early;
 242 }
 243
 244 static void setup_early_output(struct rev_info *rev)
 245 {
 246         struct sigaction sa;
 247
 248         /*
 249          * Set up the signal handler, minimally intrusively:
 250          * we only set a single volatile integer word (not
 251          * using sigatomic_t - trying to avoid unnecessary
 252          * system dependencies and headers), and using
 253          * SA_RESTART.
 254          */
 255         memset(&sa, 0, sizeof(sa));
 256         sa.sa_handler = early_output;
 257         sigemptyset(&sa.sa_mask);
 258         sa.sa_flags = SA_RESTART;
 259         sigaction(SIGALRM, &sa, NULL);
 260
 261         /*
 262          * If we can get the whole output in less than a
 263          * tenth of a second, don't even bother doing the
 264          * early-output thing..
 265          *
 266          * This is a one-time-only trigger.
 267          */
 268         early_output_timer.it_value.tv_sec = 0;
 269         early_output_timer.it_value.tv_usec = 100000;
 270         setitimer(ITIMER_REAL, &early_output_timer, NULL);
 271 }
 272
 273 static void finish_early_output(struct rev_info *rev)
 274 {
 275         int n = estimate_commit_count(rev, rev->commits);
 276         signal(SIGALRM, SIG_IGN);
 277         show_early_header(rev, "done", n);
 278 }
 279
 280 static int cmd_log_walk(struct rev_info *rev)
 281 {
 282         struct commit *commit;
 283         int saved_nrl = 0;
 284         int saved_dcctc = 0;
 285
 286         if (rev->early_output)
 287                 setup_early_output(rev);
 288
 289         if (prepare_revision_walk(rev))
 290                 die(_("revision walk setup failed"));
 291
 292         if (rev->early_output)
 293                 finish_early_output(rev);
 294
 295         /*
 296          * For --check and --exit-code, the exit code is based on CHECK_FAILED
 297          * and HAS_CHANGES being accumulated in rev->diffopt, so be careful to
 298          * retain that state information if replacing rev->diffopt in this loop
 299          */
 300         while ((commit = get_revision(rev)) != NULL) {
 301                 if (!log_tree_commit(rev, commit) &&
 302                     rev->max_count >= 0)
 303                         /*
 304                          * We decremented max_count in get_revision,
 305                          * but we didn't actually show the commit.
 306                          */
 307                         rev->max_count++;
 308                 if (!rev->reflog_info) {
 309                         /* we allow cycles in reflog ancestry */
 310                         free(commit->buffer);
 311                         commit->buffer = NULL;
 312                 }
 313                 free_commit_list(commit->parents);
 314                 commit->parents = NULL;
 315                 if (saved_nrl < rev->diffopt.needed_rename_limit)
 316                         saved_nrl = rev->diffopt.needed_rename_limit;
 317                 if (rev->diffopt.degraded_cc_to_c)
 318                         saved_dcctc = 1;
 319         }
 320         rev->diffopt.degraded_cc_to_c = saved_dcctc;
 321         rev->diffopt.needed_rename_limit = saved_nrl;
 322
 323         if (rev->diffopt.output_format & DIFF_FORMAT_CHECKDIFF &&
 324             DIFF_OPT_TST(&rev->diffopt, CHECK_FAILED)) {
 325                 return 02;
 326         }
 327         return diff_result_code(&rev->diffopt, 0);
 328 }
 329
 330 static int git_log_config(const char *var, const char *value, void *cb)
 331 {
 332         if (!strcmp(var, "format.pretty"))
 333                 return git_config_string(&fmt_pretty, var, value);
 334         if (!strcmp(var, "format.subjectprefix"))
 335                 return git_config_string(&fmt_patch_subject_prefix, var, value);
 336         if (!strcmp(var, "log.abbrevcommit")) {
 337                 default_abbrev_commit = git_config_bool(var, value);
 338                 return 0;
 339         }
 340         if (!strcmp(var, "log.date"))
 341                 return git_config_string(&default_date_mode, var, value);
 342         if (!strcmp(var, "log.decorate")) {
 343                 decoration_style = parse_decoration_style(var, value);
 344                 if (decoration_style < 0)
 345                         decoration_style = 0; /* maybe warn? */
 346                 return 0;
 347         }
 348         if (!strcmp(var, "log.showroot")) {
 349                 default_show_root = git_config_bool(var, value);
 350                 return 0;
 351         }
 352         if (!prefixcmp(var, "color.decorate."))
 353                 return parse_decorate_color_config(var, 15, value);
 354
 355         return git_diff_ui_config(var, value, cb);
 356 }
 357
 358 int cmd_whatchanged(int argc, const char **argv, const char *prefix)
 359 {
 360         struct rev_info rev;
 361         struct setup_revision_opt opt;
 362
 363         git_config(git_log_config, NULL);
 364
 365         init_revisions(&rev, prefix);
 366         rev.diff = 1;
 367         rev.simplify_history = 0;
 368         memset(&opt, 0, sizeof(opt));
 369         opt.def = "HEAD";
 370         cmd_log_init(argc, argv, prefix, &rev, &opt);
 371         if (!rev.diffopt.output_format)
 372                 rev.diffopt.output_format = DIFF_FORMAT_RAW;
 373         return cmd_log_walk(&rev);
 374 }
 375
 376 static void show_tagger(char *buf, int len, struct rev_info *rev)
 377 {
 378         struct strbuf out = STRBUF_INIT;
 379         struct pretty_print_context pp = {0};
 380
 381         pp.fmt = rev->commit_format;
 382         pp.date_mode = rev->date_mode;
 383         pp_user_info(&pp, "Tagger", &out, buf, get_log_output_encoding());
 384         printf("%s", out.buf);
 385         strbuf_release(&out);
 386 }
 387
 388 static int show_blob_object(const unsigned char *sha1, struct rev_info *rev)
 389 {
 390         fflush(stdout);
 391         return stream_blob_to_fd(1, sha1, NULL, 0);
 392 }
 393
 394 static int show_tag_object(const unsigned char *sha1, struct rev_info *rev)
 395 {
 396         unsigned long size;
 397         enum object_type type;
 398         char *buf = read_sha1_file(sha1, &type, &size);
 399         int offset = 0;
 400
 401         if (!buf)
 402                 return error(_("Could not read object %s"), sha1_to_hex(sha1));
 403
 404         assert(type == OBJ_TAG);
 405         while (offset < size && buf[offset] != '\n') {
 406                 int new_offset = offset + 1;
 407                 while (new_offset < size && buf[new_offset++] != '\n')
 408                         ; /* do nothing */
 409                 if (!prefixcmp(buf + offset, "tagger "))
 410                         show_tagger(buf + offset + 7,
 411                                     new_offset - offset - 7, rev);
 412                 offset = new_offset;
 413         }
 414
 415         if (offset < size)
 416                 fwrite(buf + offset, size - offset, 1, stdout);
 417         free(buf);
 418         return 0;
 419 }
 420
 421 static int show_tree_object(const unsigned char *sha1,
 422                 const char *base, int baselen,
 423                 const char *pathname, unsigned mode, int stage, void *context)
 424 {
 425         printf("%s%s\n", pathname, S_ISDIR(mode) ? "/" : "");
 426         return 0;
 427 }
 428
 429 static void show_rev_tweak_rev(struct rev_info *rev, struct setup_revision_opt *opt)
 430 {
 431         if (rev->ignore_merges) {
 432                 /* There was no "-m" on the command line */
 433                 rev->ignore_merges = 0;
 434                 if (!rev->first_parent_only && !rev->combine_merges) {
 435                         /* No "--first-parent", "-c", nor "--cc" */
 436                         rev->combine_merges = 1;
 437                         rev->dense_combined_merges = 1;
 438                 }
 439         }
 440         if (!rev->diffopt.output_format)
 441                 rev->diffopt.output_format = DIFF_FORMAT_PATCH;
 442 }
 443
 444 int cmd_show(int argc, const char **argv, const char *prefix)
 445 {
 446         struct rev_info rev;
 447         struct object_array_entry *objects;
 448         struct setup_revision_opt opt;
 449         struct pathspec match_all;
 450         int i, count, ret = 0;
 451
 452         git_config(git_log_config, NULL);
 453
 454         init_pathspec(&match_all, NULL);
 455         init_revisions(&rev, prefix);
 456         rev.diff = 1;
 457         rev.always_show_header = 1;
 458         rev.no_walk = 1;
 459         rev.diffopt.stat_width = -1;    /* Scale to real terminal size */
 460
 461         memset(&opt, 0, sizeof(opt));
 462         opt.def = "HEAD";
 463         opt.tweak = show_rev_tweak_rev;
 464         cmd_log_init(argc, argv, prefix, &rev, &opt);
 465
 466         if (!rev.no_walk)
 467                 return cmd_log_walk(&rev);
 468
 469         count = rev.pending.nr;
 470         objects = rev.pending.objects;
 471         for (i = 0; i < count && !ret; i++) {
 472                 struct object *o = objects[i].item;
 473                 const char *name = objects[i].name;
 474                 switch (o->type) {
 475                 case OBJ_BLOB:
 476                         ret = show_blob_object(o->sha1, NULL);
 477                         break;
 478                 case OBJ_TAG: {
 479                         struct tag *t = (struct tag *)o;
 480
 481                         if (rev.shown_one)
 482                                 putchar('\n');
 483                         printf("%stag %s%s\n",
 484                                         diff_get_color_opt(&rev.diffopt, DIFF_COMMIT),
 485                                         t->tag,
 486                                         diff_get_color_opt(&rev.diffopt, DIFF_RESET));
 487                         ret = show_tag_object(o->sha1, &rev);
 488                         rev.shown_one = 1;
 489                         if (ret)
 490                                 break;
 491                         o = parse_object(t->tagged->sha1);
 492                         if (!o)
 493                                 ret = error(_("Could not read object %s"),
 494                                             sha1_to_hex(t->tagged->sha1));
 495                         objects[i].item = o;
 496                         i--;
 497                         break;
 498                 }
 499                 case OBJ_TREE:
 500                         if (rev.shown_one)
 501                                 putchar('\n');
 502                         printf("%stree %s%s\n\n",
 503                                         diff_get_color_opt(&rev.diffopt, DIFF_COMMIT),
 504                                         name,
 505                                         diff_get_color_opt(&rev.diffopt, DIFF_RESET));
 506                         read_tree_recursive((struct tree *)o, "", 0, 0, &match_all,
 507                                         show_tree_object, NULL);
 508                         rev.shown_one = 1;
 509                         break;
 510                 case OBJ_COMMIT:
 511                         rev.pending.nr = rev.pending.alloc = 0;
 512                         rev.pending.objects = NULL;
 513                         add_object_array(o, name, &rev.pending);
 514                         ret = cmd_log_walk(&rev);
 515                         break;
 516                 default:
 517                         ret = error(_("Unknown type: %d"), o->type);
 518                 }
 519         }
 520         free(objects);
 521         return ret;
 522 }
 523
 524 /*
 525  * This is equivalent to "git log -g --abbrev-commit --pretty=oneline"
 526  */
 527 int cmd_log_reflog(int argc, const char **argv, const char *prefix)
 528 {
 529         struct rev_info rev;
 530         struct setup_revision_opt opt;
 531
 532         git_config(git_log_config, NULL);
 533
 534         init_revisions(&rev, prefix);
 535         init_reflog_walk(&rev.reflog_info);
 536         rev.verbose_header = 1;
 537         memset(&opt, 0, sizeof(opt));
 538         opt.def = "HEAD";
 539         cmd_log_init_defaults(&rev);
 540         rev.abbrev_commit = 1;
 541         rev.commit_format = CMIT_FMT_ONELINE;
 542         rev.use_terminator = 1;
 543         rev.always_show_header = 1;
 544         cmd_log_init_finish(argc, argv, prefix, &rev, &opt);
 545
 546         return cmd_log_walk(&rev);
 547 }
 548
 549 int cmd_log(int argc, const char **argv, const char *prefix)
 550 {
 551         struct rev_info rev;
 552         struct setup_revision_opt opt;
 553
 554         git_config(git_log_config, NULL);
 555
 556         init_revisions(&rev, prefix);
 557         rev.always_show_header = 1;
 558         memset(&opt, 0, sizeof(opt));
 559         opt.def = "HEAD";
 560         cmd_log_init(argc, argv, prefix, &rev, &opt);
 561         return cmd_log_walk(&rev);
 562 }
 563
 564 /* format-patch */
 565
 566 static const char *fmt_patch_suffix = ".patch";
 567 static int numbered = 0;
 568 static int auto_number = 1;
 569
 570 static char *default_attach = NULL;
 571
 572 static struct string_list extra_hdr;
 573 static struct string_list extra_to;
 574 static struct string_list extra_cc;
 575
 576 static void add_header(const char *value)
 577 {
 578         struct string_list_item *item;
 579         int len = strlen(value);
 580         while (len && value[len - 1] == '\n')
 581                 len--;
 582
 583         if (!strncasecmp(value, "to: ", 4)) {
 584                 item = string_list_append(&extra_to, value + 4);
 585                 len -= 4;
 586         } else if (!strncasecmp(value, "cc: ", 4)) {
 587                 item = string_list_append(&extra_cc, value + 4);
 588                 len -= 4;
 589         } else {
 590                 item = string_list_append(&extra_hdr, value);
 591         }
 592
 593         item->string[len] = '\0';
 594 }
 595
 596 #define THREAD_SHALLOW 1
 597 #define THREAD_DEEP 2
 598 static int thread;
 599 static int do_signoff;
 600 static const char *signature = git_version_string;
 601
 602 static int git_format_config(const char *var, const char *value, void *cb)
 603 {
 604         if (!strcmp(var, "format.headers")) {
 605                 if (!value)
 606                         die(_("format.headers without value"));
 607                 add_header(value);
 608                 return 0;
 609         }
 610         if (!strcmp(var, "format.suffix"))
 611                 return git_config_string(&fmt_patch_suffix, var, value);
 612         if (!strcmp(var, "format.to")) {
 613                 if (!value)
 614                         return config_error_nonbool(var);
 615                 string_list_append(&extra_to, value);
 616                 return 0;
 617         }
 618         if (!strcmp(var, "format.cc")) {
 619                 if (!value)
 620                         return config_error_nonbool(var);
 621                 string_list_append(&extra_cc, value);
 622                 return 0;
 623         }
 624         if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff") ||
 625             !strcmp(var, "color.ui")) {
 626                 return 0;
 627         }
 628         if (!strcmp(var, "format.numbered")) {
 629                 if (value && !strcasecmp(value, "auto")) {
 630                         auto_number = 1;
 631                         return 0;
 632                 }
 633                 numbered = git_config_bool(var, value);
 634                 auto_number = auto_number && numbered;
 635                 return 0;
 636         }
 637         if (!strcmp(var, "format.attach")) {
 638                 if (value && *value)
 639                         default_attach = xstrdup(value);
 640                 else
 641                         default_attach = xstrdup(git_version_string);
 642                 return 0;
 643         }
 644         if (!strcmp(var, "format.thread")) {
 645                 if (value && !strcasecmp(value, "deep")) {
 646                         thread = THREAD_DEEP;
 647                         return 0;
 648                 }
 649                 if (value && !strcasecmp(value, "shallow")) {
 650                         thread = THREAD_SHALLOW;
 651                         return 0;
 652                 }
 653                 thread = git_config_bool(var, value) && THREAD_SHALLOW;
 654                 return 0;
 655         }
 656         if (!strcmp(var, "format.signoff")) {
 657                 do_signoff = git_config_bool(var, value);
 658                 return 0;
 659         }
 660         if (!strcmp(var, "format.signature"))
 661                 return git_config_string(&signature, var, value);
 662
 663         return git_log_config(var, value, cb);
 664 }
 665
 666 static FILE *realstdout = NULL;
 667 static const char *output_directory = NULL;
 668 static int outdir_offset;
 669
 670 static int reopen_stdout(struct commit *commit, const char *subject,
 671                          struct rev_info *rev, int quiet)
 672 {
 673         struct strbuf filename = STRBUF_INIT;
 674         int suffix_len = strlen(fmt_patch_suffix) + 1;
 675
 676         if (output_directory) {
 677                 strbuf_addstr(&filename, output_directory);
 678                 if (filename.len >=
 679                     PATH_MAX - FORMAT_PATCH_NAME_MAX - suffix_len)
 680                         return error(_("name of output directory is too long"));
 681                 if (filename.buf[filename.len - 1] != '/')
 682                         strbuf_addch(&filename, '/');
 683         }
 684
 685         get_patch_filename(commit, subject, rev->nr, fmt_patch_suffix, &filename);
 686
 687         if (!quiet)
 688                 fprintf(realstdout, "%s\n", filename.buf + outdir_offset);
 689
 690         if (freopen(filename.buf, "w", stdout) == NULL)
 691                 return error(_("Cannot open patch file %s"), filename.buf);
 692
 693         strbuf_release(&filename);
 694         return 0;
 695 }
 696
 697 static void get_patch_ids(struct rev_info *rev, struct patch_ids *ids, const char *prefix)
 698 {
 699         struct rev_info check_rev;
 700         struct commit *commit;
 701         struct object *o1, *o2;
 702         unsigned flags1, flags2;
 703
 704         if (rev->pending.nr != 2)
 705                 die(_("Need exactly one range."));
 706
 707         o1 = rev->pending.objects[0].item;
 708         flags1 = o1->flags;
 709         o2 = rev->pending.objects[1].item;
 710         flags2 = o2->flags;
 711
 712         if ((flags1 & UNINTERESTING) == (flags2 & UNINTERESTING))
 713                 die(_("Not a range."));
 714
 715         init_patch_ids(ids);
 716
 717         /* given a range a..b get all patch ids for b..a */
 718         init_revisions(&check_rev, prefix);
 719         o1->flags ^= UNINTERESTING;
 720         o2->flags ^= UNINTERESTING;
 721         add_pending_object(&check_rev, o1, "o1");
 722         add_pending_object(&check_rev, o2, "o2");
 723         if (prepare_revision_walk(&check_rev))
 724                 die(_("revision walk setup failed"));
 725
 726         while ((commit = get_revision(&check_rev)) != NULL) {
 727                 /* ignore merges */
 728                 if (commit->parents && commit->parents->next)
 729                         continue;
 730
 731                 add_commit_patch_id(commit, ids);
 732         }
 733
 734         /* reset for next revision walk */
 735         clear_commit_marks((struct commit *)o1,
 736                         SEEN | UNINTERESTING | SHOWN | ADDED);
 737         clear_commit_marks((struct commit *)o2,
 738                         SEEN | UNINTERESTING | SHOWN | ADDED);
 739         o1->flags = flags1;
 740         o2->flags = flags2;
 741 }
 742
 743 static void gen_message_id(struct rev_info *info, char *base)
 744 {
 745         struct strbuf buf = STRBUF_INIT;
 746         strbuf_addf(&buf, "%s.%lu.git.%s", base,
 747                     (unsigned long) time(NULL),
 748                     git_committer_info(IDENT_NO_NAME|IDENT_NO_DATE|IDENT_STRICT));
 749         info->message_id = strbuf_detach(&buf, NULL);
 750 }
 751
 752 static void print_signature(void)
 753 {
 754         if (signature && *signature)
 755                 printf("-- \n%s\n\n", signature);
 756 }
 757
 758 static void add_branch_description(struct strbuf *buf, const char *branch_name)
 759 {
 760         struct strbuf desc = STRBUF_INIT;
 761         if (!branch_name || !*branch_name)
 762                 return;
 763         read_branch_desc(&desc, branch_name);
 764         if (desc.len) {
 765                 strbuf_addch(buf, '\n');
 766                 strbuf_add(buf, desc.buf, desc.len);
 767                 strbuf_addch(buf, '\n');
 768         }
 769 }
 770
 771 static void make_cover_letter(struct rev_info *rev, int use_stdout,
 772                               int numbered, int numbered_files,
 773                               struct commit *origin,
 774                               int nr, struct commit **list, struct commit *head,
 775                               const char *branch_name,
 776                               int quiet)
 777 {
 778         const char *committer;
 779         const char *body = "*** SUBJECT HERE ***\n\n*** BLURB HERE ***\n";
 780         const char *msg;
 781         struct shortlog log;
 782         struct strbuf sb = STRBUF_INIT;
 783         int i;
 784         const char *encoding = "UTF-8";
 785         struct diff_options opts;
 786         int need_8bit_cte = 0;
 787         struct pretty_print_context pp = {0};
 788
 789         if (rev->commit_format != CMIT_FMT_EMAIL)
 790                 die(_("Cover letter needs email format"));
 791
 792         committer = git_committer_info(0);
 793
 794         if (!use_stdout &&
 795             reopen_stdout(NULL, numbered_files ? NULL : "cover-letter", rev, quiet))
 796                 return;
 797
 798         log_write_email_headers(rev, head, &pp.subject, &pp.after_subject,
 799                                 &need_8bit_cte);
 800
 801         for (i = 0; !need_8bit_cte && i < nr; i++)
 802                 if (has_non_ascii(list[i]->buffer))
 803                         need_8bit_cte = 1;
 804
 805         msg = body;
 806         pp.fmt = CMIT_FMT_EMAIL;
 807         pp.date_mode = DATE_RFC2822;
 808         pp_user_info(&pp, NULL, &sb, committer, encoding);
 809         pp_title_line(&pp, &msg, &sb, encoding, need_8bit_cte);
 810         pp_remainder(&pp, &msg, &sb, 0);
 811         add_branch_description(&sb, branch_name);
 812         printf("%s\n", sb.buf);
 813
 814         strbuf_release(&sb);
 815
 816         shortlog_init(&log);
 817         log.wrap_lines = 1;
 818         log.wrap = 72;
 819         log.in1 = 2;
 820         log.in2 = 4;
 821         for (i = 0; i < nr; i++)
 822                 shortlog_add_commit(&log, list[i]);
 823
 824         shortlog_output(&log);
 825
 826         /*
 827          * We can only do diffstat with a unique reference point
 828          */
 829         if (!origin)
 830                 return;
 831
 832         memcpy(&opts, &rev->diffopt, sizeof(opts));
 833         opts.output_format = DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT;
 834
 835         diff_setup_done(&opts);
 836
 837         diff_tree_sha1(origin->tree->object.sha1,
 838                        head->tree->object.sha1,
 839                        "", &opts);
 840         diffcore_std(&opts);
 841         diff_flush(&opts);
 842
 843         printf("\n");
 844         print_signature();
 845 }
 846
 847 static const char *clean_message_id(const char *msg_id)
 848 {
 849         char ch;
 850         const char *a, *z, *m;
 851
 852         m = msg_id;
 853         while ((ch = *m) && (isspace(ch) || (ch == '<')))
 854                 m++;
 855         a = m;
 856         z = NULL;
 857         while ((ch = *m)) {
 858                 if (!isspace(ch) && (ch != '>'))
 859                         z = m;
 860                 m++;
 861         }
 862         if (!z)
 863                 die(_("insane in-reply-to: %s"), msg_id);
 864         if (++z == m)
 865                 return a;
 866         return xmemdupz(a, z - a);
 867 }
 868
 869 static const char *set_outdir(const char *prefix, const char *output_directory)
 870 {
 871         if (output_directory && is_absolute_path(output_directory))
 872                 return output_directory;
 873
 874         if (!prefix || !*prefix) {
 875                 if (output_directory)
 876                         return output_directory;
 877                 /* The user did not explicitly ask for "./" */
 878                 outdir_offset = 2;
 879                 return "./";
 880         }
 881
 882         outdir_offset = strlen(prefix);
 883         if (!output_directory)
 884                 return prefix;
 885
 886         return xstrdup(prefix_filename(prefix, outdir_offset,
 887                                        output_directory));
 888 }
 889
 890 static const char * const builtin_format_patch_usage[] = {
 891         "git format-patch [options] [<since> | <revision range>]",
 892         NULL
 893 };
 894
 895 static int keep_subject = 0;
 896
 897 static int keep_callback(const struct option *opt, const char *arg, int unset)
 898 {
 899         ((struct rev_info *)opt->value)->total = -1;
 900         keep_subject = 1;
 901         return 0;
 902 }
 903
 904 static int subject_prefix = 0;
 905
 906 static int subject_prefix_callback(const struct option *opt, const char *arg,
 907                             int unset)
 908 {
 909         subject_prefix = 1;
 910         ((struct rev_info *)opt->value)->subject_prefix = arg;
 911         return 0;
 912 }
 913
 914 static int numbered_cmdline_opt = 0;
 915
 916 static int numbered_callback(const struct option *opt, const char *arg,
 917                              int unset)
 918 {
 919         *(int *)opt->value = numbered_cmdline_opt = unset ? 0 : 1;
 920         if (unset)
 921                 auto_number =  0;
 922         return 0;
 923 }
 924
 925 static int no_numbered_callback(const struct option *opt, const char *arg,
 926                                 int unset)
 927 {
 928         return numbered_callback(opt, arg, 1);
 929 }
 930
 931 static int output_directory_callback(const struct option *opt, const char *arg,
 932                               int unset)
 933 {
 934         const char **dir = (const char **)opt->value;
 935         if (*dir)
 936                 die(_("Two output directories?"));
 937         *dir = arg;
 938         return 0;
 939 }
 940
 941 static int thread_callback(const struct option *opt, const char *arg, int unset)
 942 {
 943         int *thread = (int *)opt->value;
 944         if (unset)
 945                 *thread = 0;
 946         else if (!arg || !strcmp(arg, "shallow"))
 947                 *thread = THREAD_SHALLOW;
 948         else if (!strcmp(arg, "deep"))
 949                 *thread = THREAD_DEEP;
 950         else
 951                 return 1;
 952         return 0;
 953 }
 954
 955 static int attach_callback(const struct option *opt, const char *arg, int unset)
 956 {
 957         struct rev_info *rev = (struct rev_info *)opt->value;
 958         if (unset)
 959                 rev->mime_boundary = NULL;
 960         else if (arg)
 961                 rev->mime_boundary = arg;
 962         else
 963                 rev->mime_boundary = git_version_string;
 964         rev->no_inline = unset ? 0 : 1;
 965         return 0;
 966 }
 967
 968 static int inline_callback(const struct option *opt, const char *arg, int unset)
 969 {
 970         struct rev_info *rev = (struct rev_info *)opt->value;
 971         if (unset)
 972                 rev->mime_boundary = NULL;
 973         else if (arg)
 974                 rev->mime_boundary = arg;
 975         else
 976                 rev->mime_boundary = git_version_string;
 977         rev->no_inline = 0;
 978         return 0;
 979 }
 980
 981 static int header_callback(const struct option *opt, const char *arg, int unset)
 982 {
 983         if (unset) {
 984                 string_list_clear(&extra_hdr, 0);
 985                 string_list_clear(&extra_to, 0);
 986                 string_list_clear(&extra_cc, 0);
 987         } else {
 988             add_header(arg);
 989         }
 990         return 0;
 991 }
 992
 993 static int to_callback(const struct option *opt, const char *arg, int unset)
 994 {
 995         if (unset)
 996                 string_list_clear(&extra_to, 0);
 997         else
 998                 string_list_append(&extra_to, arg);
 999         return 0;
1000 }
1001
1002 static int cc_callback(const struct option *opt, const char *arg, int unset)
1003 {
1004         if (unset)
1005                 string_list_clear(&extra_cc, 0);
1006         else
1007                 string_list_append(&extra_cc, arg);
1008         return 0;
1009 }
1010
1011 static char *find_branch_name(struct rev_info *rev)
1012 {
1013         int i, positive = -1;
1014         unsigned char branch_sha1[20];
1015         struct strbuf buf = STRBUF_INIT;
1016         const char *branch;
1017
1018         for (i = 0; i < rev->cmdline.nr; i++) {
1019                 if (rev->cmdline.rev[i].flags & UNINTERESTING)
1020                         continue;
1021                 if (positive < 0)
1022                         positive = i;
1023                 else
1024                         return NULL;
1025         }
1026         if (positive < 0)
1027                 return NULL;
1028         strbuf_addf(&buf, "refs/heads/%s", rev->cmdline.rev[positive].name);
1029         branch = resolve_ref_unsafe(buf.buf, branch_sha1, 1, NULL);
1030         if (!branch ||
1031             prefixcmp(branch, "refs/heads/") ||
1032             hashcmp(rev->cmdline.rev[positive].item->sha1, branch_sha1))
1033                 branch = NULL;
1034         strbuf_release(&buf);
1035         if (branch)
1036                 return xstrdup(rev->cmdline.rev[positive].name);
1037         return NULL;
1038 }
1039
1040 int cmd_format_patch(int argc, const char **argv, const char *prefix)
1041 {
1042         struct commit *commit;
1043         struct commit **list = NULL;
1044         struct rev_info rev;
1045         struct setup_revision_opt s_r_opt;
1046         int nr = 0, total, i;
1047         int use_stdout = 0;
1048         int start_number = -1;
1049         int numbered_files = 0;         /* _just_ numbers */
1050         int ignore_if_in_upstream = 0;
1051         int cover_letter = 0;
1052         int boundary_count = 0;
1053         int no_binary_diff = 0;
1054         struct commit *origin = NULL, *head = NULL;
1055         const char *in_reply_to = NULL;
1056         struct patch_ids ids;
1057         char *add_signoff = NULL;
1058         struct strbuf buf = STRBUF_INIT;
1059         int use_patch_format = 0;
1060         int quiet = 0;
1061         char *branch_name = NULL;
1062         const struct option builtin_format_patch_options[] = {
1063                 { OPTION_CALLBACK, 'n', "numbered", &numbered, NULL,
1064                             "use [PATCH n/m] even with a single patch",
1065                             PARSE_OPT_NOARG, numbered_callback },
1066                 { OPTION_CALLBACK, 'N', "no-numbered", &numbered, NULL,
1067                             "use [PATCH] even with multiple patches",
1068                             PARSE_OPT_NOARG, no_numbered_callback },
1069                 OPT_BOOLEAN('s', "signoff", &do_signoff, "add Signed-off-by:"),
1070                 OPT_BOOLEAN(0, "stdout", &use_stdout,
1071                             "print patches to standard out"),
1072                 OPT_BOOLEAN(0, "cover-letter", &cover_letter,
1073                             "generate a cover letter"),
1074                 OPT_BOOLEAN(0, "numbered-files", &numbered_files,
1075                             "use simple number sequence for output file names"),
1076                 OPT_STRING(0, "suffix", &fmt_patch_suffix, "sfx",
1077                             "use <sfx> instead of '.patch'"),
1078                 OPT_INTEGER(0, "start-number", &start_number,
1079                             "start numbering patches at <n> instead of 1"),
1080                 { OPTION_CALLBACK, 0, "subject-prefix", &rev, "prefix",
1081                             "Use [<prefix>] instead of [PATCH]",
1082                             PARSE_OPT_NONEG, subject_prefix_callback },
1083                 { OPTION_CALLBACK, 'o', "output-directory", &output_directory,
1084                             "dir", "store resulting files in <dir>",
1085                             PARSE_OPT_NONEG, output_directory_callback },
1086                 { OPTION_CALLBACK, 'k', "keep-subject", &rev, NULL,
1087                             "don't strip/add [PATCH]",
1088                             PARSE_OPT_NOARG | PARSE_OPT_NONEG, keep_callback },
1089                 OPT_BOOLEAN(0, "no-binary", &no_binary_diff,
1090                             "don't output binary diffs"),
1091                 OPT_BOOLEAN(0, "ignore-if-in-upstream", &ignore_if_in_upstream,
1092                             "don't include a patch matching a commit upstream"),
1093                 { OPTION_BOOLEAN, 'p', "no-stat", &use_patch_format, NULL,
1094                   "show patch format instead of default (patch + stat)",
1095                   PARSE_OPT_NONEG | PARSE_OPT_NOARG },
1096                 OPT_GROUP("Messaging"),
1097                 { OPTION_CALLBACK, 0, "add-header", NULL, "header",
1098                             "add email header", 0, header_callback },
1099                 { OPTION_CALLBACK, 0, "to", NULL, "email", "add To: header",
1100                             0, to_callback },
1101                 { OPTION_CALLBACK, 0, "cc", NULL, "email", "add Cc: header",
1102                             0, cc_callback },
1103                 OPT_STRING(0, "in-reply-to", &in_reply_to, "message-id",
1104                             "make first mail a reply to <message-id>"),
1105                 { OPTION_CALLBACK, 0, "attach", &rev, "boundary",
1106                             "attach the patch", PARSE_OPT_OPTARG,
1107                             attach_callback },
1108                 { OPTION_CALLBACK, 0, "inline", &rev, "boundary",
1109                             "inline the patch",
1110                             PARSE_OPT_OPTARG | PARSE_OPT_NONEG,
1111                             inline_callback },
1112                 { OPTION_CALLBACK, 0, "thread", &thread, "style",
1113                             "enable message threading, styles: shallow, deep",
1114                             PARSE_OPT_OPTARG, thread_callback },
1115                 OPT_STRING(0, "signature", &signature, "signature",
1116                             "add a signature"),
1117                 OPT_BOOLEAN(0, "quiet", &quiet,
1118                             "don't print the patch filenames"),
1119                 OPT_END()
1120         };
1121
1122         extra_hdr.strdup_strings = 1;
1123         extra_to.strdup_strings = 1;
1124         extra_cc.strdup_strings = 1;
1125         git_config(git_format_config, NULL);
1126         init_revisions(&rev, prefix);
1127         rev.commit_format = CMIT_FMT_EMAIL;
1128         rev.verbose_header = 1;
1129         rev.diff = 1;
1130         rev.max_parents = 1;
1131         DIFF_OPT_SET(&rev.diffopt, RECURSIVE);
1132         rev.subject_prefix = fmt_patch_subject_prefix;
1133         memset(&s_r_opt, 0, sizeof(s_r_opt));
1134         s_r_opt.def = "HEAD";
1135
1136         if (default_attach) {
1137                 rev.mime_boundary = default_attach;
1138                 rev.no_inline = 1;
1139         }
1140
1141         /*
1142          * Parse the arguments before setup_revisions(), or something
1143          * like "git format-patch -o a123 HEAD^.." may fail; a123 is
1144          * possibly a valid SHA1.
1145          */
1146         argc = parse_options(argc, argv, prefix, builtin_format_patch_options,
1147                              builtin_format_patch_usage,
1148                              PARSE_OPT_KEEP_ARGV0 | PARSE_OPT_KEEP_UNKNOWN |
1149                              PARSE_OPT_KEEP_DASHDASH);
1150
1151         if (do_signoff) {
1152                 const char *committer;
1153                 const char *endpos;
1154                 committer = git_committer_info(IDENT_STRICT);
1155                 endpos = strchr(committer, '>');
1156                 if (!endpos)
1157                         die(_("bogus committer info %s"), committer);
1158                 add_signoff = xmemdupz(committer, endpos - committer + 1);
1159         }
1160
1161         for (i = 0; i < extra_hdr.nr; i++) {
1162                 strbuf_addstr(&buf, extra_hdr.items[i].string);
1163                 strbuf_addch(&buf, '\n');
1164         }
1165
1166         if (extra_to.nr)
1167                 strbuf_addstr(&buf, "To: ");
1168         for (i = 0; i < extra_to.nr; i++) {
1169                 if (i)
1170                         strbuf_addstr(&buf, "    ");
1171                 strbuf_addstr(&buf, extra_to.items[i].string);
1172                 if (i + 1 < extra_to.nr)
1173                         strbuf_addch(&buf, ',');
1174                 strbuf_addch(&buf, '\n');
1175         }
1176
1177         if (extra_cc.nr)
1178                 strbuf_addstr(&buf, "Cc: ");
1179         for (i = 0; i < extra_cc.nr; i++) {
1180                 if (i)
1181                         strbuf_addstr(&buf, "    ");
1182                 strbuf_addstr(&buf, extra_cc.items[i].string);
1183                 if (i + 1 < extra_cc.nr)
1184                         strbuf_addch(&buf, ',');
1185                 strbuf_addch(&buf, '\n');
1186         }
1187
1188         rev.extra_headers = strbuf_detach(&buf, NULL);
1189
1190         if (start_number < 0)
1191                 start_number = 1;
1192
1193         /*
1194          * If numbered is set solely due to format.numbered in config,
1195          * and it would conflict with --keep-subject (-k) from the
1196          * command line, reset "numbered".
1197          */
1198         if (numbered && keep_subject && !numbered_cmdline_opt)
1199                 numbered = 0;
1200
1201         if (numbered && keep_subject)
1202                 die (_("-n and -k are mutually exclusive."));
1203         if (keep_subject && subject_prefix)
1204                 die (_("--subject-prefix and -k are mutually exclusive."));
1205         rev.preserve_subject = keep_subject;
1206
1207         argc = setup_revisions(argc, argv, &rev, &s_r_opt);
1208         if (argc > 1)
1209                 die (_("unrecognized argument: %s"), argv[1]);
1210
1211         if (rev.diffopt.output_format & DIFF_FORMAT_NAME)
1212                 die(_("--name-only does not make sense"));
1213         if (rev.diffopt.output_format & DIFF_FORMAT_NAME_STATUS)
1214                 die(_("--name-status does not make sense"));
1215         if (rev.diffopt.output_format & DIFF_FORMAT_CHECKDIFF)
1216                 die(_("--check does not make sense"));
1217
1218         if (!use_patch_format &&
1219                 (!rev.diffopt.output_format ||
1220                  rev.diffopt.output_format == DIFF_FORMAT_PATCH))
1221                 rev.diffopt.output_format = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_SUMMARY;
1222
1223         /* Always generate a patch */
1224         rev.diffopt.output_format |= DIFF_FORMAT_PATCH;
1225
1226         if (!DIFF_OPT_TST(&rev.diffopt, TEXT) && !no_binary_diff)
1227                 DIFF_OPT_SET(&rev.diffopt, BINARY);
1228
1229         if (rev.show_notes)
1230                 init_display_notes(&rev.notes_opt);
1231
1232         if (!use_stdout)
1233                 output_directory = set_outdir(prefix, output_directory);
1234         else
1235                 setup_pager();
1236
1237         if (output_directory) {
1238                 if (use_stdout)
1239                         die(_("standard output, or directory, which one?"));
1240                 if (mkdir(output_directory, 0777) < 0 && errno != EEXIST)
1241                         die_errno(_("Could not create directory '%s'"),
1242                                   output_directory);
1243         }
1244
1245         if (rev.pending.nr == 1) {
1246                 if (rev.max_count < 0 && !rev.show_root_diff) {
1247                         /*
1248                          * This is traditional behaviour of "git format-patch
1249                          * origin" that prepares what the origin side still
1250                          * does not have.
1251                          */
1252                         unsigned char sha1[20];
1253                         const char *ref;
1254
1255                         rev.pending.objects[0].item->flags |= UNINTERESTING;
1256                         add_head_to_pending(&rev);
1257                         ref = resolve_ref_unsafe("HEAD", sha1, 1, NULL);
1258                         if (ref && !prefixcmp(ref, "refs/heads/"))
1259                                 branch_name = xstrdup(ref + strlen("refs/heads/"));
1260                         else
1261                                 branch_name = xstrdup(""); /* no branch */
1262                 }
1263                 /*
1264                  * Otherwise, it is "format-patch -22 HEAD", and/or
1265                  * "format-patch --root HEAD".  The user wants
1266                  * get_revision() to do the usual traversal.
1267                  */
1268         }
1269
1270         /*
1271          * We cannot move this anywhere earlier because we do want to
1272          * know if --root was given explicitly from the command line.
1273          */
1274         rev.show_root_diff = 1;
1275
1276         if (cover_letter) {
1277                 /*
1278                  * NEEDSWORK:randomly pick one positive commit to show
1279                  * diffstat; this is often the tip and the command
1280                  * happens to do the right thing in most cases, but a
1281                  * complex command like "--cover-letter a b c ^bottom"
1282                  * picks "c" and shows diffstat between bottom..c
1283                  * which may not match what the series represents at
1284                  * all and totally broken.
1285                  */
1286                 int i;
1287                 for (i = 0; i < rev.pending.nr; i++) {
1288                         struct object *o = rev.pending.objects[i].item;
1289                         if (!(o->flags & UNINTERESTING))
1290                                 head = (struct commit *)o;
1291                 }
1292                 /* There is nothing to show; it is not an error, though. */
1293                 if (!head)
1294                         return 0;
1295                 if (!branch_name)
1296                         branch_name = find_branch_name(&rev);
1297         }
1298
1299         if (ignore_if_in_upstream) {
1300                 /* Don't say anything if head and upstream are the same. */
1301                 if (rev.pending.nr == 2) {
1302                         struct object_array_entry *o = rev.pending.objects;
1303                         if (hashcmp(o[0].item->sha1, o[1].item->sha1) == 0)
1304                                 return 0;
1305                 }
1306                 get_patch_ids(&rev, &ids, prefix);
1307         }
1308
1309         if (!use_stdout)
1310                 realstdout = xfdopen(xdup(1), "w");
1311
1312         if (prepare_revision_walk(&rev))
1313                 die(_("revision walk setup failed"));
1314         rev.boundary = 1;
1315         while ((commit = get_revision(&rev)) != NULL) {
1316                 if (commit->object.flags & BOUNDARY) {
1317                         boundary_count++;
1318                         origin = (boundary_count == 1) ? commit : NULL;
1319                         continue;
1320                 }
1321
1322                 if (ignore_if_in_upstream &&
1323                                 has_commit_patch_id(commit, &ids))
1324                         continue;
1325
1326                 nr++;
1327                 list = xrealloc(list, nr * sizeof(list[0]));
1328                 list[nr - 1] = commit;
1329         }
1330         total = nr;
1331         if (!keep_subject && auto_number && total > 1)
1332                 numbered = 1;
1333         if (numbered)
1334                 rev.total = total + start_number - 1;
1335         if (in_reply_to || thread || cover_letter)
1336                 rev.ref_message_ids = xcalloc(1, sizeof(struct string_list));
1337         if (in_reply_to) {
1338                 const char *msgid = clean_message_id(in_reply_to);
1339                 string_list_append(rev.ref_message_ids, msgid);
1340         }
1341         rev.numbered_files = numbered_files;
1342         rev.patch_suffix = fmt_patch_suffix;
1343         if (cover_letter) {
1344                 if (thread)
1345                         gen_message_id(&rev, "cover");
1346                 make_cover_letter(&rev, use_stdout, numbered, numbered_files,
1347                                   origin, nr, list, head, branch_name, quiet);
1348                 total++;
1349                 start_number--;
1350         }
1351         rev.add_signoff = add_signoff;
1352         while (0 <= --nr) {
1353                 int shown;
1354                 commit = list[nr];
1355                 rev.nr = total - nr + (start_number - 1);
1356                 /* Make the second and subsequent mails replies to the first */
1357                 if (thread) {
1358                         /* Have we already had a message ID? */
1359                         if (rev.message_id) {
1360                                 /*
1361                                  * For deep threading: make every mail
1362                                  * a reply to the previous one, no
1363                                  * matter what other options are set.
1364                                  *
1365                                  * For shallow threading:
1366                                  *
1367                                  * Without --cover-letter and
1368                                  * --in-reply-to, make every mail a
1369                                  * reply to the one before.
1370                                  *
1371                                  * With --in-reply-to but no
1372                                  * --cover-letter, make every mail a
1373                                  * reply to the <reply-to>.
1374                                  *
1375                                  * With --cover-letter, make every
1376                                  * mail but the cover letter a reply
1377                                  * to the cover letter.  The cover
1378                                  * letter is a reply to the
1379                                  * --in-reply-to, if specified.
1380                                  */
1381                                 if (thread == THREAD_SHALLOW
1382                                     && rev.ref_message_ids->nr > 0
1383                                     && (!cover_letter || rev.nr > 1))
1384                                         free(rev.message_id);
1385                                 else
1386                                         string_list_append(rev.ref_message_ids,
1387                                                            rev.message_id);
1388                         }
1389                         gen_message_id(&rev, sha1_to_hex(commit->object.sha1));
1390                 }
1391
1392                 if (!use_stdout &&
1393                     reopen_stdout(numbered_files ? NULL : commit, NULL, &rev, quiet))
1394                         die(_("Failed to create output files"));
1395                 shown = log_tree_commit(&rev, commit);
1396                 free(commit->buffer);
1397                 commit->buffer = NULL;
1398
1399                 /* We put one extra blank line between formatted
1400                  * patches and this flag is used by log-tree code
1401                  * to see if it needs to emit a LF before showing
1402                  * the log; when using one file per patch, we do
1403                  * not want the extra blank line.
1404                  */
1405                 if (!use_stdout)
1406                         rev.shown_one = 0;
1407                 if (shown) {
1408                         if (rev.mime_boundary)
1409                                 printf("\n--%s%s--\n\n\n",
1410                                        mime_boundary_leader,
1411                                        rev.mime_boundary);
1412                         else
1413                                 print_signature();
1414                 }
1415                 if (!use_stdout)
1416                         fclose(stdout);
1417         }
1418         free(list);
1419         free(branch_name);
1420         string_list_clear(&extra_to, 0);
1421         string_list_clear(&extra_cc, 0);
1422         string_list_clear(&extra_hdr, 0);
1423         if (ignore_if_in_upstream)
1424                 free_patch_ids(&ids);
1425         return 0;
1426 }
1427
1428 static int add_pending_commit(const char *arg, struct rev_info *revs, int flags)
1429 {
1430         unsigned char sha1[20];
1431         if (get_sha1(arg, sha1) == 0) {
1432                 struct commit *commit = lookup_commit_reference(sha1);
1433                 if (commit) {
1434                         commit->object.flags |= flags;
1435                         add_pending_object(revs, &commit->object, arg);
1436                         return 0;
1437                 }
1438         }
1439         return -1;
1440 }
1441
1442 static const char * const cherry_usage[] = {
1443         "git cherry [-v] [<upstream> [<head> [<limit>]]]",
1444         NULL
1445 };
1446
1447 static void print_commit(char sign, struct commit *commit, int verbose,
1448                          int abbrev)
1449 {
1450         if (!verbose) {
1451                 printf("%c %s\n", sign,
1452                        find_unique_abbrev(commit->object.sha1, abbrev));
1453         } else {
1454                 struct strbuf buf = STRBUF_INIT;
1455                 pp_commit_easy(CMIT_FMT_ONELINE, commit, &buf);
1456                 printf("%c %s %s\n", sign,
1457                        find_unique_abbrev(commit->object.sha1, abbrev),
1458                        buf.buf);
1459                 strbuf_release(&buf);
1460         }
1461 }
1462
1463 int cmd_cherry(int argc, const char **argv, const char *prefix)
1464 {
1465         struct rev_info revs;
1466         struct patch_ids ids;
1467         struct commit *commit;
1468         struct commit_list *list = NULL;
1469         struct branch *current_branch;
1470         const char *upstream;
1471         const char *head = "HEAD";
1472         const char *limit = NULL;
1473         int verbose = 0, abbrev = 0;
1474
1475         struct option options[] = {
1476                 OPT__ABBREV(&abbrev),
1477                 OPT__VERBOSE(&verbose, "be verbose"),
1478                 OPT_END()
1479         };
1480
1481         argc = parse_options(argc, argv, prefix, options, cherry_usage, 0);
1482
1483         switch (argc) {
1484         case 3:
1485                 limit = argv[2];
1486                 /* FALLTHROUGH */
1487         case 2:
1488                 head = argv[1];
1489                 /* FALLTHROUGH */
1490         case 1:
1491                 upstream = argv[0];
1492                 break;
1493         default:
1494                 current_branch = branch_get(NULL);
1495                 if (!current_branch || !current_branch->merge
1496                                         || !current_branch->merge[0]
1497                                         || !current_branch->merge[0]->dst) {
1498                         fprintf(stderr, _("Could not find a tracked"
1499                                         " remote branch, please"
1500                                         " specify <upstream> manually.\n"));
1501                         usage_with_options(cherry_usage, options);
1502                 }
1503
1504                 upstream = current_branch->merge[0]->dst;
1505         }
1506
1507         init_revisions(&revs, prefix);
1508         revs.diff = 1;
1509         revs.combine_merges = 0;
1510         revs.ignore_merges = 1;
1511         DIFF_OPT_SET(&revs.diffopt, RECURSIVE);
1512
1513         if (add_pending_commit(head, &revs, 0))
1514                 die(_("Unknown commit %s"), head);
1515         if (add_pending_commit(upstream, &revs, UNINTERESTING))
1516                 die(_("Unknown commit %s"), upstream);
1517
1518         /* Don't say anything if head and upstream are the same. */
1519         if (revs.pending.nr == 2) {
1520                 struct object_array_entry *o = revs.pending.objects;
1521                 if (hashcmp(o[0].item->sha1, o[1].item->sha1) == 0)
1522                         return 0;
1523         }
1524
1525         get_patch_ids(&revs, &ids, prefix);
1526
1527         if (limit && add_pending_commit(limit, &revs, UNINTERESTING))
1528                 die(_("Unknown commit %s"), limit);
1529
1530         /* reverse the list of commits */
1531         if (prepare_revision_walk(&revs))
1532                 die(_("revision walk setup failed"));
1533         while ((commit = get_revision(&revs)) != NULL) {
1534                 /* ignore merges */
1535                 if (commit->parents && commit->parents->next)
1536                         continue;
1537
1538                 commit_list_insert(commit, &list);
1539         }
1540
1541         while (list) {
1542                 char sign = '+';
1543
1544                 commit = list->item;
1545                 if (has_commit_patch_id(commit, &ids))
1546                         sign = '-';
1547                 print_commit(sign, commit, verbose, abbrev);
1548                 list = list->next;
1549         }
1550
1551         free_patch_ids(&ids);
1552         return 0;
1553 }