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
  22 /* Set a default date-time format for git log ("log.date" config variable) */
  23 static const char *default_date_mode = NULL;
  24
  25 static int default_show_root = 1;
  26 static const char *fmt_patch_subject_prefix = "PATCH";
  27 static const char *fmt_pretty;
  28
  29 static void cmd_log_init(int argc, const char **argv, const char *prefix,
  30                       struct rev_info *rev)
  31 {
  32         int i;
  33
  34         rev->abbrev = DEFAULT_ABBREV;
  35         rev->commit_format = CMIT_FMT_DEFAULT;
  36         if (fmt_pretty)
  37                 get_commit_format(fmt_pretty, rev);
  38         rev->verbose_header = 1;
  39         DIFF_OPT_SET(&rev->diffopt, RECURSIVE);
  40         rev->show_root_diff = default_show_root;
  41         rev->subject_prefix = fmt_patch_subject_prefix;
  42         DIFF_OPT_SET(&rev->diffopt, ALLOW_TEXTCONV);
  43
  44         if (default_date_mode)
  45                 rev->date_mode = parse_date_format(default_date_mode);
  46
  47         argc = setup_revisions(argc, argv, rev, "HEAD");
  48
  49         if (rev->diffopt.pickaxe || rev->diffopt.filter)
  50                 rev->always_show_header = 0;
  51         if (DIFF_OPT_TST(&rev->diffopt, FOLLOW_RENAMES)) {
  52                 rev->always_show_header = 0;
  53                 if (rev->diffopt.nr_paths != 1)
  54                         usage("git logs can only follow renames on one pathname at a time");
  55         }
  56         for (i = 1; i < argc; i++) {
  57                 const char *arg = argv[i];
  58                 if (!strcmp(arg, "--decorate")) {
  59                         load_ref_decorations();
  60                         rev->show_decorations = 1;
  61                 } else if (!strcmp(arg, "--source")) {
  62                         rev->show_source = 1;
  63                 } else
  64                         die("unrecognized argument: %s", arg);
  65         }
  66 }
  67
  68 /*
  69  * This gives a rough estimate for how many commits we
  70  * will print out in the list.
  71  */
  72 static int estimate_commit_count(struct rev_info *rev, struct commit_list *list)
  73 {
  74         int n = 0;
  75
  76         while (list) {
  77                 struct commit *commit = list->item;
  78                 unsigned int flags = commit->object.flags;
  79                 list = list->next;
  80                 if (!(flags & (TREESAME | UNINTERESTING)))
  81                         n++;
  82         }
  83         return n;
  84 }
  85
  86 static void show_early_header(struct rev_info *rev, const char *stage, int nr)
  87 {
  88         if (rev->shown_one) {
  89                 rev->shown_one = 0;
  90                 if (rev->commit_format != CMIT_FMT_ONELINE)
  91                         putchar(rev->diffopt.line_termination);
  92         }
  93         printf("Final output: %d %s\n", nr, stage);
  94 }
  95
  96 struct itimerval early_output_timer;
  97
  98 static void log_show_early(struct rev_info *revs, struct commit_list *list)
  99 {
 100         int i = revs->early_output;
 101         int show_header = 1;
 102
 103         sort_in_topological_order(&list, revs->lifo);
 104         while (list && i) {
 105                 struct commit *commit = list->item;
 106                 switch (simplify_commit(revs, commit)) {
 107                 case commit_show:
 108                         if (show_header) {
 109                                 int n = estimate_commit_count(revs, list);
 110                                 show_early_header(revs, "incomplete", n);
 111                                 show_header = 0;
 112                         }
 113                         log_tree_commit(revs, commit);
 114                         i--;
 115                         break;
 116                 case commit_ignore:
 117                         break;
 118                 case commit_error:
 119                         return;
 120                 }
 121                 list = list->next;
 122         }
 123
 124         /* Did we already get enough commits for the early output? */
 125         if (!i)
 126                 return;
 127
 128         /*
 129          * ..if no, then repeat it twice a second until we
 130          * do.
 131          *
 132          * NOTE! We don't use "it_interval", because if the
 133          * reader isn't listening, we want our output to be
 134          * throttled by the writing, and not have the timer
 135          * trigger every second even if we're blocked on a
 136          * reader!
 137          */
 138         early_output_timer.it_value.tv_sec = 0;
 139         early_output_timer.it_value.tv_usec = 500000;
 140         setitimer(ITIMER_REAL, &early_output_timer, NULL);
 141 }
 142
 143 static void early_output(int signal)
 144 {
 145         show_early_output = log_show_early;
 146 }
 147
 148 static void setup_early_output(struct rev_info *rev)
 149 {
 150         struct sigaction sa;
 151
 152         /*
 153          * Set up the signal handler, minimally intrusively:
 154          * we only set a single volatile integer word (not
 155          * using sigatomic_t - trying to avoid unnecessary
 156          * system dependencies and headers), and using
 157          * SA_RESTART.
 158          */
 159         memset(&sa, 0, sizeof(sa));
 160         sa.sa_handler = early_output;
 161         sigemptyset(&sa.sa_mask);
 162         sa.sa_flags = SA_RESTART;
 163         sigaction(SIGALRM, &sa, NULL);
 164
 165         /*
 166          * If we can get the whole output in less than a
 167          * tenth of a second, don't even bother doing the
 168          * early-output thing..
 169          *
 170          * This is a one-time-only trigger.
 171          */
 172         early_output_timer.it_value.tv_sec = 0;
 173         early_output_timer.it_value.tv_usec = 100000;
 174         setitimer(ITIMER_REAL, &early_output_timer, NULL);
 175 }
 176
 177 static void finish_early_output(struct rev_info *rev)
 178 {
 179         int n = estimate_commit_count(rev, rev->commits);
 180         signal(SIGALRM, SIG_IGN);
 181         show_early_header(rev, "done", n);
 182 }
 183
 184 static int cmd_log_walk(struct rev_info *rev)
 185 {
 186         struct commit *commit;
 187
 188         if (rev->early_output)
 189                 setup_early_output(rev);
 190
 191         if (prepare_revision_walk(rev))
 192                 die("revision walk setup failed");
 193
 194         if (rev->early_output)
 195                 finish_early_output(rev);
 196
 197         /*
 198          * For --check and --exit-code, the exit code is based on CHECK_FAILED
 199          * and HAS_CHANGES being accumulated in rev->diffopt, so be careful to
 200          * retain that state information if replacing rev->diffopt in this loop
 201          */
 202         while ((commit = get_revision(rev)) != NULL) {
 203                 log_tree_commit(rev, commit);
 204                 if (!rev->reflog_info) {
 205                         /* we allow cycles in reflog ancestry */
 206                         free(commit->buffer);
 207                         commit->buffer = NULL;
 208                 }
 209                 free_commit_list(commit->parents);
 210                 commit->parents = NULL;
 211         }
 212         if (rev->diffopt.output_format & DIFF_FORMAT_CHECKDIFF &&
 213             DIFF_OPT_TST(&rev->diffopt, CHECK_FAILED)) {
 214                 return 02;
 215         }
 216         return diff_result_code(&rev->diffopt, 0);
 217 }
 218
 219 static int git_log_config(const char *var, const char *value, void *cb)
 220 {
 221         if (!strcmp(var, "format.pretty"))
 222                 return git_config_string(&fmt_pretty, var, value);
 223         if (!strcmp(var, "format.subjectprefix"))
 224                 return git_config_string(&fmt_patch_subject_prefix, var, value);
 225         if (!strcmp(var, "log.date"))
 226                 return git_config_string(&default_date_mode, var, value);
 227         if (!strcmp(var, "log.showroot")) {
 228                 default_show_root = git_config_bool(var, value);
 229                 return 0;
 230         }
 231         return git_diff_ui_config(var, value, cb);
 232 }
 233
 234 int cmd_whatchanged(int argc, const char **argv, const char *prefix)
 235 {
 236         struct rev_info rev;
 237
 238         git_config(git_log_config, NULL);
 239
 240         if (diff_use_color_default == -1)
 241                 diff_use_color_default = git_use_color_default;
 242
 243         init_revisions(&rev, prefix);
 244         rev.diff = 1;
 245         rev.simplify_history = 0;
 246         cmd_log_init(argc, argv, prefix, &rev);
 247         if (!rev.diffopt.output_format)
 248                 rev.diffopt.output_format = DIFF_FORMAT_RAW;
 249         return cmd_log_walk(&rev);
 250 }
 251
 252 static void show_tagger(char *buf, int len, struct rev_info *rev)
 253 {
 254         struct strbuf out = STRBUF_INIT;
 255
 256         pp_user_info("Tagger", rev->commit_format, &out, buf, rev->date_mode,
 257                 git_log_output_encoding ?
 258                 git_log_output_encoding: git_commit_encoding);
 259         printf("%s\n", out.buf);
 260         strbuf_release(&out);
 261 }
 262
 263 static int show_object(const unsigned char *sha1, int show_tag_object,
 264         struct rev_info *rev)
 265 {
 266         unsigned long size;
 267         enum object_type type;
 268         char *buf = read_sha1_file(sha1, &type, &size);
 269         int offset = 0;
 270
 271         if (!buf)
 272                 return error("Could not read object %s", sha1_to_hex(sha1));
 273
 274         if (show_tag_object)
 275                 while (offset < size && buf[offset] != '\n') {
 276                         int new_offset = offset + 1;
 277                         while (new_offset < size && buf[new_offset++] != '\n')
 278                                 ; /* do nothing */
 279                         if (!prefixcmp(buf + offset, "tagger "))
 280                                 show_tagger(buf + offset + 7,
 281                                             new_offset - offset - 7, rev);
 282                         offset = new_offset;
 283                 }
 284
 285         if (offset < size)
 286                 fwrite(buf + offset, size - offset, 1, stdout);
 287         free(buf);
 288         return 0;
 289 }
 290
 291 static int show_tree_object(const unsigned char *sha1,
 292                 const char *base, int baselen,
 293                 const char *pathname, unsigned mode, int stage, void *context)
 294 {
 295         printf("%s%s\n", pathname, S_ISDIR(mode) ? "/" : "");
 296         return 0;
 297 }
 298
 299 int cmd_show(int argc, const char **argv, const char *prefix)
 300 {
 301         struct rev_info rev;
 302         struct object_array_entry *objects;
 303         int i, count, ret = 0;
 304
 305         git_config(git_log_config, NULL);
 306
 307         if (diff_use_color_default == -1)
 308                 diff_use_color_default = git_use_color_default;
 309
 310         init_revisions(&rev, prefix);
 311         rev.diff = 1;
 312         rev.combine_merges = 1;
 313         rev.dense_combined_merges = 1;
 314         rev.always_show_header = 1;
 315         rev.ignore_merges = 0;
 316         rev.no_walk = 1;
 317         cmd_log_init(argc, argv, prefix, &rev);
 318
 319         count = rev.pending.nr;
 320         objects = rev.pending.objects;
 321         for (i = 0; i < count && !ret; i++) {
 322                 struct object *o = objects[i].item;
 323                 const char *name = objects[i].name;
 324                 switch (o->type) {
 325                 case OBJ_BLOB:
 326                         ret = show_object(o->sha1, 0, NULL);
 327                         break;
 328                 case OBJ_TAG: {
 329                         struct tag *t = (struct tag *)o;
 330
 331                         printf("%stag %s%s\n",
 332                                         diff_get_color_opt(&rev.diffopt, DIFF_COMMIT),
 333                                         t->tag,
 334                                         diff_get_color_opt(&rev.diffopt, DIFF_RESET));
 335                         ret = show_object(o->sha1, 1, &rev);
 336                         if (ret)
 337                                 break;
 338                         o = parse_object(t->tagged->sha1);
 339                         if (!o)
 340                                 ret = error("Could not read object %s",
 341                                             sha1_to_hex(t->tagged->sha1));
 342                         objects[i].item = o;
 343                         i--;
 344                         break;
 345                 }
 346                 case OBJ_TREE:
 347                         printf("%stree %s%s\n\n",
 348                                         diff_get_color_opt(&rev.diffopt, DIFF_COMMIT),
 349                                         name,
 350                                         diff_get_color_opt(&rev.diffopt, DIFF_RESET));
 351                         read_tree_recursive((struct tree *)o, "", 0, 0, NULL,
 352                                         show_tree_object, NULL);
 353                         break;
 354                 case OBJ_COMMIT:
 355                         rev.pending.nr = rev.pending.alloc = 0;
 356                         rev.pending.objects = NULL;
 357                         add_object_array(o, name, &rev.pending);
 358                         ret = cmd_log_walk(&rev);
 359                         break;
 360                 default:
 361                         ret = error("Unknown type: %d", o->type);
 362                 }
 363         }
 364         free(objects);
 365         return ret;
 366 }
 367
 368 /*
 369  * This is equivalent to "git log -g --abbrev-commit --pretty=oneline"
 370  */
 371 int cmd_log_reflog(int argc, const char **argv, const char *prefix)
 372 {
 373         struct rev_info rev;
 374
 375         git_config(git_log_config, NULL);
 376
 377         if (diff_use_color_default == -1)
 378                 diff_use_color_default = git_use_color_default;
 379
 380         init_revisions(&rev, prefix);
 381         init_reflog_walk(&rev.reflog_info);
 382         rev.abbrev_commit = 1;
 383         rev.verbose_header = 1;
 384         cmd_log_init(argc, argv, prefix, &rev);
 385
 386         /*
 387          * This means that we override whatever commit format the user gave
 388          * on the cmd line.  Sad, but cmd_log_init() currently doesn't
 389          * allow us to set a different default.
 390          */
 391         rev.commit_format = CMIT_FMT_ONELINE;
 392         rev.use_terminator = 1;
 393         rev.always_show_header = 1;
 394
 395         /*
 396          * We get called through "git reflog", so unlike the other log
 397          * routines, we need to set up our pager manually..
 398          */
 399         setup_pager();
 400
 401         return cmd_log_walk(&rev);
 402 }
 403
 404 int cmd_log(int argc, const char **argv, const char *prefix)
 405 {
 406         struct rev_info rev;
 407
 408         git_config(git_log_config, NULL);
 409
 410         if (diff_use_color_default == -1)
 411                 diff_use_color_default = git_use_color_default;
 412
 413         init_revisions(&rev, prefix);
 414         rev.always_show_header = 1;
 415         cmd_log_init(argc, argv, prefix, &rev);
 416         return cmd_log_walk(&rev);
 417 }
 418
 419 /* format-patch */
 420 #define FORMAT_PATCH_NAME_MAX 64
 421
 422 static int istitlechar(char c)
 423 {
 424         return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') ||
 425                 (c >= '0' && c <= '9') || c == '.' || c == '_';
 426 }
 427
 428 static const char *fmt_patch_suffix = ".patch";
 429 static int numbered = 0;
 430 static int auto_number = 1;
 431
 432 static char *default_attach = NULL;
 433
 434 static char **extra_hdr;
 435 static int extra_hdr_nr;
 436 static int extra_hdr_alloc;
 437
 438 static char **extra_to;
 439 static int extra_to_nr;
 440 static int extra_to_alloc;
 441
 442 static char **extra_cc;
 443 static int extra_cc_nr;
 444 static int extra_cc_alloc;
 445
 446 static void add_header(const char *value)
 447 {
 448         int len = strlen(value);
 449         while (len && value[len - 1] == '\n')
 450                 len--;
 451         if (!strncasecmp(value, "to: ", 4)) {
 452                 ALLOC_GROW(extra_to, extra_to_nr + 1, extra_to_alloc);
 453                 extra_to[extra_to_nr++] = xstrndup(value + 4, len - 4);
 454                 return;
 455         }
 456         if (!strncasecmp(value, "cc: ", 4)) {
 457                 ALLOC_GROW(extra_cc, extra_cc_nr + 1, extra_cc_alloc);
 458                 extra_cc[extra_cc_nr++] = xstrndup(value + 4, len - 4);
 459                 return;
 460         }
 461         ALLOC_GROW(extra_hdr, extra_hdr_nr + 1, extra_hdr_alloc);
 462         extra_hdr[extra_hdr_nr++] = xstrndup(value, len);
 463 }
 464
 465 #define THREAD_SHALLOW 1
 466 #define THREAD_DEEP 2
 467 static int thread = 0;
 468
 469 static int git_format_config(const char *var, const char *value, void *cb)
 470 {
 471         if (!strcmp(var, "format.headers")) {
 472                 if (!value)
 473                         die("format.headers without value");
 474                 add_header(value);
 475                 return 0;
 476         }
 477         if (!strcmp(var, "format.suffix"))
 478                 return git_config_string(&fmt_patch_suffix, var, value);
 479         if (!strcmp(var, "format.cc")) {
 480                 if (!value)
 481                         return config_error_nonbool(var);
 482                 ALLOC_GROW(extra_cc, extra_cc_nr + 1, extra_cc_alloc);
 483                 extra_cc[extra_cc_nr++] = xstrdup(value);
 484                 return 0;
 485         }
 486         if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
 487                 return 0;
 488         }
 489         if (!strcmp(var, "format.numbered")) {
 490                 if (value && !strcasecmp(value, "auto")) {
 491                         auto_number = 1;
 492                         return 0;
 493                 }
 494                 numbered = git_config_bool(var, value);
 495                 auto_number = auto_number && numbered;
 496                 return 0;
 497         }
 498         if (!strcmp(var, "format.attach")) {
 499                 if (value && *value)
 500                         default_attach = xstrdup(value);
 501                 else
 502                         default_attach = xstrdup(git_version_string);
 503                 return 0;
 504         }
 505         if (!strcmp(var, "format.thread")) {
 506                 if (value && !strcasecmp(value, "deep")) {
 507                         thread = THREAD_DEEP;
 508                         return 0;
 509                 }
 510                 if (value && !strcasecmp(value, "shallow")) {
 511                         thread = THREAD_SHALLOW;
 512                         return 0;
 513                 }
 514                 thread = git_config_bool(var, value) && THREAD_SHALLOW;
 515                 return 0;
 516         }
 517
 518         return git_log_config(var, value, cb);
 519 }
 520
 521
 522 static const char *get_oneline_for_filename(struct commit *commit,
 523                                             int keep_subject)
 524 {
 525         static char filename[PATH_MAX];
 526         char *sol;
 527         int len = 0;
 528         int suffix_len = strlen(fmt_patch_suffix) + 1;
 529
 530         sol = strstr(commit->buffer, "\n\n");
 531         if (!sol)
 532                 filename[0] = '\0';
 533         else {
 534                 int j, space = 0;
 535
 536                 sol += 2;
 537                 /* strip [PATCH] or [PATCH blabla] */
 538                 if (!keep_subject && !prefixcmp(sol, "[PATCH")) {
 539                         char *eos = strchr(sol + 6, ']');
 540                         if (eos) {
 541                                 while (isspace(*eos))
 542                                         eos++;
 543                                 sol = eos;
 544                         }
 545                 }
 546
 547                 for (j = 0;
 548                      j < FORMAT_PATCH_NAME_MAX - suffix_len - 5 &&
 549                              len < sizeof(filename) - suffix_len &&
 550                              sol[j] && sol[j] != '\n';
 551                      j++) {
 552                         if (istitlechar(sol[j])) {
 553                                 if (space) {
 554                                         filename[len++] = '-';
 555                                         space = 0;
 556                                 }
 557                                 filename[len++] = sol[j];
 558                                 if (sol[j] == '.')
 559                                         while (sol[j + 1] == '.')
 560                                                 j++;
 561                         } else
 562                                 space = 1;
 563                 }
 564                 while (filename[len - 1] == '.'
 565                        || filename[len - 1] == '-')
 566                         len--;
 567                 filename[len] = '\0';
 568         }
 569         return filename;
 570 }
 571
 572 static FILE *realstdout = NULL;
 573 static const char *output_directory = NULL;
 574 static int outdir_offset;
 575
 576 static int reopen_stdout(const char *oneline, int nr, int total)
 577 {
 578         char filename[PATH_MAX];
 579         int len = 0;
 580         int suffix_len = strlen(fmt_patch_suffix) + 1;
 581
 582         if (output_directory) {
 583                 len = snprintf(filename, sizeof(filename), "%s",
 584                                 output_directory);
 585                 if (len >=
 586                     sizeof(filename) - FORMAT_PATCH_NAME_MAX - suffix_len)
 587                         return error("name of output directory is too long");
 588                 if (filename[len - 1] != '/')
 589                         filename[len++] = '/';
 590         }
 591
 592         if (!oneline)
 593                 len += sprintf(filename + len, "%d", nr);
 594         else {
 595                 len += sprintf(filename + len, "%04d-", nr);
 596                 len += snprintf(filename + len, sizeof(filename) - len - 1
 597                                 - suffix_len, "%s", oneline);
 598                 strcpy(filename + len, fmt_patch_suffix);
 599         }
 600
 601         fprintf(realstdout, "%s\n", filename + outdir_offset);
 602         if (freopen(filename, "w", stdout) == NULL)
 603                 return error("Cannot open patch file %s",filename);
 604
 605         return 0;
 606 }
 607
 608 static void get_patch_ids(struct rev_info *rev, struct patch_ids *ids, const char *prefix)
 609 {
 610         struct rev_info check_rev;
 611         struct commit *commit;
 612         struct object *o1, *o2;
 613         unsigned flags1, flags2;
 614
 615         if (rev->pending.nr != 2)
 616                 die("Need exactly one range.");
 617
 618         o1 = rev->pending.objects[0].item;
 619         flags1 = o1->flags;
 620         o2 = rev->pending.objects[1].item;
 621         flags2 = o2->flags;
 622
 623         if ((flags1 & UNINTERESTING) == (flags2 & UNINTERESTING))
 624                 die("Not a range.");
 625
 626         init_patch_ids(ids);
 627
 628         /* given a range a..b get all patch ids for b..a */
 629         init_revisions(&check_rev, prefix);
 630         o1->flags ^= UNINTERESTING;
 631         o2->flags ^= UNINTERESTING;
 632         add_pending_object(&check_rev, o1, "o1");
 633         add_pending_object(&check_rev, o2, "o2");
 634         if (prepare_revision_walk(&check_rev))
 635                 die("revision walk setup failed");
 636
 637         while ((commit = get_revision(&check_rev)) != NULL) {
 638                 /* ignore merges */
 639                 if (commit->parents && commit->parents->next)
 640                         continue;
 641
 642                 add_commit_patch_id(commit, ids);
 643         }
 644
 645         /* reset for next revision walk */
 646         clear_commit_marks((struct commit *)o1,
 647                         SEEN | UNINTERESTING | SHOWN | ADDED);
 648         clear_commit_marks((struct commit *)o2,
 649                         SEEN | UNINTERESTING | SHOWN | ADDED);
 650         o1->flags = flags1;
 651         o2->flags = flags2;
 652 }
 653
 654 static void gen_message_id(struct rev_info *info, char *base)
 655 {
 656         const char *committer = git_committer_info(IDENT_WARN_ON_NO_NAME);
 657         const char *email_start = strrchr(committer, '<');
 658         const char *email_end = strrchr(committer, '>');
 659         struct strbuf buf = STRBUF_INIT;
 660         if (!email_start || !email_end || email_start > email_end - 1)
 661                 die("Could not extract email from committer identity.");
 662         strbuf_addf(&buf, "%s.%lu.git.%.*s", base,
 663                     (unsigned long) time(NULL),
 664                     (int)(email_end - email_start - 1), email_start + 1);
 665         info->message_id = strbuf_detach(&buf, NULL);
 666 }
 667
 668 static void make_cover_letter(struct rev_info *rev, int use_stdout,
 669                               int numbered, int numbered_files,
 670                               struct commit *origin,
 671                               int nr, struct commit **list, struct commit *head)
 672 {
 673         const char *committer;
 674         char *head_sha1;
 675         const char *subject_start = NULL;
 676         const char *body = "*** SUBJECT HERE ***\n\n*** BLURB HERE ***\n";
 677         const char *msg;
 678         const char *extra_headers = rev->extra_headers;
 679         struct shortlog log;
 680         struct strbuf sb = STRBUF_INIT;
 681         int i;
 682         const char *encoding = "utf-8";
 683         struct diff_options opts;
 684         int need_8bit_cte = 0;
 685
 686         if (rev->commit_format != CMIT_FMT_EMAIL)
 687                 die("Cover letter needs email format");
 688
 689         if (!use_stdout && reopen_stdout(numbered_files ?
 690                                 NULL : "cover-letter", 0, rev->total))
 691                 return;
 692
 693         head_sha1 = sha1_to_hex(head->object.sha1);
 694
 695         log_write_email_headers(rev, head_sha1, &subject_start, &extra_headers,
 696                                 &need_8bit_cte);
 697
 698         committer = git_committer_info(0);
 699
 700         msg = body;
 701         pp_user_info(NULL, CMIT_FMT_EMAIL, &sb, committer, DATE_RFC2822,
 702                      encoding);
 703         pp_title_line(CMIT_FMT_EMAIL, &msg, &sb, subject_start, extra_headers,
 704                       encoding, need_8bit_cte);
 705         pp_remainder(CMIT_FMT_EMAIL, &msg, &sb, 0);
 706         printf("%s\n", sb.buf);
 707
 708         strbuf_release(&sb);
 709
 710         shortlog_init(&log);
 711         log.wrap_lines = 1;
 712         log.wrap = 72;
 713         log.in1 = 2;
 714         log.in2 = 4;
 715         for (i = 0; i < nr; i++)
 716                 shortlog_add_commit(&log, list[i]);
 717
 718         shortlog_output(&log);
 719
 720         /*
 721          * We can only do diffstat with a unique reference point
 722          */
 723         if (!origin)
 724                 return;
 725
 726         memcpy(&opts, &rev->diffopt, sizeof(opts));
 727         opts.output_format = DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT;
 728
 729         diff_setup_done(&opts);
 730
 731         diff_tree_sha1(origin->tree->object.sha1,
 732                        head->tree->object.sha1,
 733                        "", &opts);
 734         diffcore_std(&opts);
 735         diff_flush(&opts);
 736
 737         printf("\n");
 738 }
 739
 740 static const char *clean_message_id(const char *msg_id)
 741 {
 742         char ch;
 743         const char *a, *z, *m;
 744
 745         m = msg_id;
 746         while ((ch = *m) && (isspace(ch) || (ch == '<')))
 747                 m++;
 748         a = m;
 749         z = NULL;
 750         while ((ch = *m)) {
 751                 if (!isspace(ch) && (ch != '>'))
 752                         z = m;
 753                 m++;
 754         }
 755         if (!z)
 756                 die("insane in-reply-to: %s", msg_id);
 757         if (++z == m)
 758                 return a;
 759         return xmemdupz(a, z - a);
 760 }
 761
 762 static const char *set_outdir(const char *prefix, const char *output_directory)
 763 {
 764         if (output_directory && is_absolute_path(output_directory))
 765                 return output_directory;
 766
 767         if (!prefix || !*prefix) {
 768                 if (output_directory)
 769                         return output_directory;
 770                 /* The user did not explicitly ask for "./" */
 771                 outdir_offset = 2;
 772                 return "./";
 773         }
 774
 775         outdir_offset = strlen(prefix);
 776         if (!output_directory)
 777                 return prefix;
 778
 779         return xstrdup(prefix_filename(prefix, outdir_offset,
 780                                        output_directory));
 781 }
 782
 783 int cmd_format_patch(int argc, const char **argv, const char *prefix)
 784 {
 785         struct commit *commit;
 786         struct commit **list = NULL;
 787         struct rev_info rev;
 788         int nr = 0, total, i, j;
 789         int use_stdout = 0;
 790         int start_number = -1;
 791         int keep_subject = 0;
 792         int numbered_files = 0;         /* _just_ numbers */
 793         int subject_prefix = 0;
 794         int ignore_if_in_upstream = 0;
 795         int cover_letter = 0;
 796         int boundary_count = 0;
 797         int no_binary_diff = 0;
 798         struct commit *origin = NULL, *head = NULL;
 799         const char *in_reply_to = NULL;
 800         struct patch_ids ids;
 801         char *add_signoff = NULL;
 802         struct strbuf buf = STRBUF_INIT;
 803
 804         git_config(git_format_config, NULL);
 805         init_revisions(&rev, prefix);
 806         rev.commit_format = CMIT_FMT_EMAIL;
 807         rev.verbose_header = 1;
 808         rev.diff = 1;
 809         rev.combine_merges = 0;
 810         rev.ignore_merges = 1;
 811         DIFF_OPT_SET(&rev.diffopt, RECURSIVE);
 812
 813         rev.subject_prefix = fmt_patch_subject_prefix;
 814
 815         if (default_attach) {
 816                 rev.mime_boundary = default_attach;
 817                 rev.no_inline = 1;
 818         }
 819
 820         /*
 821          * Parse the arguments before setup_revisions(), or something
 822          * like "git format-patch -o a123 HEAD^.." may fail; a123 is
 823          * possibly a valid SHA1.
 824          */
 825         for (i = 1, j = 1; i < argc; i++) {
 826                 if (!strcmp(argv[i], "--stdout"))
 827                         use_stdout = 1;
 828                 else if (!strcmp(argv[i], "-n") ||
 829                                 !strcmp(argv[i], "--numbered"))
 830                         numbered = 1;
 831                 else if (!strcmp(argv[i], "-N") ||
 832                                 !strcmp(argv[i], "--no-numbered")) {
 833                         numbered = 0;
 834                         auto_number = 0;
 835                 }
 836                 else if (!prefixcmp(argv[i], "--start-number="))
 837                         start_number = strtol(argv[i] + 15, NULL, 10);
 838                 else if (!strcmp(argv[i], "--numbered-files"))
 839                         numbered_files = 1;
 840                 else if (!strcmp(argv[i], "--start-number")) {
 841                         i++;
 842                         if (i == argc)
 843                                 die("Need a number for --start-number");
 844                         start_number = strtol(argv[i], NULL, 10);
 845                 }
 846                 else if (!prefixcmp(argv[i], "--cc=")) {
 847                         ALLOC_GROW(extra_cc, extra_cc_nr + 1, extra_cc_alloc);
 848                         extra_cc[extra_cc_nr++] = xstrdup(argv[i] + 5);
 849                 }
 850                 else if (!strcmp(argv[i], "-k") ||
 851                                 !strcmp(argv[i], "--keep-subject")) {
 852                         keep_subject = 1;
 853                         rev.total = -1;
 854                 }
 855                 else if (!strcmp(argv[i], "--output-directory") ||
 856                          !strcmp(argv[i], "-o")) {
 857                         i++;
 858                         if (argc <= i)
 859                                 die("Which directory?");
 860                         if (output_directory)
 861                                 die("Two output directories?");
 862                         output_directory = argv[i];
 863                 }
 864                 else if (!strcmp(argv[i], "--signoff") ||
 865                          !strcmp(argv[i], "-s")) {
 866                         const char *committer;
 867                         const char *endpos;
 868                         committer = git_committer_info(IDENT_ERROR_ON_NO_NAME);
 869                         endpos = strchr(committer, '>');
 870                         if (!endpos)
 871                                 die("bogus committer info %s", committer);
 872                         add_signoff = xmemdupz(committer, endpos - committer + 1);
 873                 }
 874                 else if (!strcmp(argv[i], "--attach")) {
 875                         rev.mime_boundary = git_version_string;
 876                         rev.no_inline = 1;
 877                 }
 878                 else if (!prefixcmp(argv[i], "--attach=")) {
 879                         rev.mime_boundary = argv[i] + 9;
 880                         rev.no_inline = 1;
 881                 }
 882                 else if (!strcmp(argv[i], "--no-attach")) {
 883                         rev.mime_boundary = NULL;
 884                         rev.no_inline = 0;
 885                 }
 886                 else if (!strcmp(argv[i], "--inline")) {
 887                         rev.mime_boundary = git_version_string;
 888                         rev.no_inline = 0;
 889                 }
 890                 else if (!prefixcmp(argv[i], "--inline=")) {
 891                         rev.mime_boundary = argv[i] + 9;
 892                         rev.no_inline = 0;
 893                 }
 894                 else if (!strcmp(argv[i], "--ignore-if-in-upstream"))
 895                         ignore_if_in_upstream = 1;
 896                 else if (!strcmp(argv[i], "--thread")
 897                         || !strcmp(argv[i], "--thread=shallow"))
 898                         thread = THREAD_SHALLOW;
 899                 else if (!strcmp(argv[i], "--thread=deep"))
 900                         thread = THREAD_DEEP;
 901                 else if (!strcmp(argv[i], "--no-thread"))
 902                         thread = 0;
 903                 else if (!prefixcmp(argv[i], "--in-reply-to="))
 904                         in_reply_to = argv[i] + 14;
 905                 else if (!strcmp(argv[i], "--in-reply-to")) {
 906                         i++;
 907                         if (i == argc)
 908                                 die("Need a Message-Id for --in-reply-to");
 909                         in_reply_to = argv[i];
 910                 } else if (!prefixcmp(argv[i], "--subject-prefix=")) {
 911                         subject_prefix = 1;
 912                         rev.subject_prefix = argv[i] + 17;
 913                 } else if (!prefixcmp(argv[i], "--suffix="))
 914                         fmt_patch_suffix = argv[i] + 9;
 915                 else if (!strcmp(argv[i], "--cover-letter"))
 916                         cover_letter = 1;
 917                 else if (!strcmp(argv[i], "--no-binary"))
 918                         no_binary_diff = 1;
 919                 else
 920                         argv[j++] = argv[i];
 921         }
 922         argc = j;
 923
 924         for (i = 0; i < extra_hdr_nr; i++) {
 925                 strbuf_addstr(&buf, extra_hdr[i]);
 926                 strbuf_addch(&buf, '\n');
 927         }
 928
 929         if (extra_to_nr)
 930                 strbuf_addstr(&buf, "To: ");
 931         for (i = 0; i < extra_to_nr; i++) {
 932                 if (i)
 933                         strbuf_addstr(&buf, "    ");
 934                 strbuf_addstr(&buf, extra_to[i]);
 935                 if (i + 1 < extra_to_nr)
 936                         strbuf_addch(&buf, ',');
 937                 strbuf_addch(&buf, '\n');
 938         }
 939
 940         if (extra_cc_nr)
 941                 strbuf_addstr(&buf, "Cc: ");
 942         for (i = 0; i < extra_cc_nr; i++) {
 943                 if (i)
 944                         strbuf_addstr(&buf, "    ");
 945                 strbuf_addstr(&buf, extra_cc[i]);
 946                 if (i + 1 < extra_cc_nr)
 947                         strbuf_addch(&buf, ',');
 948                 strbuf_addch(&buf, '\n');
 949         }
 950
 951         rev.extra_headers = strbuf_detach(&buf, 0);
 952
 953         if (start_number < 0)
 954                 start_number = 1;
 955         if (numbered && keep_subject)
 956                 die ("-n and -k are mutually exclusive.");
 957         if (keep_subject && subject_prefix)
 958                 die ("--subject-prefix and -k are mutually exclusive.");
 959         if (numbered_files && use_stdout)
 960                 die ("--numbered-files and --stdout are mutually exclusive.");
 961
 962         argc = setup_revisions(argc, argv, &rev, "HEAD");
 963         if (argc > 1)
 964                 die ("unrecognized argument: %s", argv[1]);
 965
 966         if (!rev.diffopt.output_format
 967                 || rev.diffopt.output_format == DIFF_FORMAT_PATCH)
 968                 rev.diffopt.output_format = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_SUMMARY | DIFF_FORMAT_PATCH;
 969
 970         if (!DIFF_OPT_TST(&rev.diffopt, TEXT) && !no_binary_diff)
 971                 DIFF_OPT_SET(&rev.diffopt, BINARY);
 972
 973         if (!use_stdout)
 974                 output_directory = set_outdir(prefix, output_directory);
 975
 976         if (output_directory) {
 977                 if (use_stdout)
 978                         die("standard output, or directory, which one?");
 979                 if (mkdir(output_directory, 0777) < 0 && errno != EEXIST)
 980                         die("Could not create directory %s",
 981                             output_directory);
 982         }
 983
 984         if (rev.pending.nr == 1) {
 985                 if (rev.max_count < 0 && !rev.show_root_diff) {
 986                         /*
 987                          * This is traditional behaviour of "git format-patch
 988                          * origin" that prepares what the origin side still
 989                          * does not have.
 990                          */
 991                         rev.pending.objects[0].item->flags |= UNINTERESTING;
 992                         add_head_to_pending(&rev);
 993                 }
 994                 /*
 995                  * Otherwise, it is "format-patch -22 HEAD", and/or
 996                  * "format-patch --root HEAD".  The user wants
 997                  * get_revision() to do the usual traversal.
 998                  */
 999         }
1000
1001         /*
1002          * We cannot move this anywhere earlier because we do want to
1003          * know if --root was given explicitly from the comand line.
1004          */
1005         rev.show_root_diff = 1;
1006
1007         if (cover_letter) {
1008                 /* remember the range */
1009                 int i;
1010                 for (i = 0; i < rev.pending.nr; i++) {
1011                         struct object *o = rev.pending.objects[i].item;
1012                         if (!(o->flags & UNINTERESTING))
1013                                 head = (struct commit *)o;
1014                 }
1015                 /* We can't generate a cover letter without any patches */
1016                 if (!head)
1017                         return 0;
1018         }
1019
1020         if (ignore_if_in_upstream)
1021                 get_patch_ids(&rev, &ids, prefix);
1022
1023         if (!use_stdout)
1024                 realstdout = xfdopen(xdup(1), "w");
1025
1026         if (prepare_revision_walk(&rev))
1027                 die("revision walk setup failed");
1028         rev.boundary = 1;
1029         while ((commit = get_revision(&rev)) != NULL) {
1030                 if (commit->object.flags & BOUNDARY) {
1031                         boundary_count++;
1032                         origin = (boundary_count == 1) ? commit : NULL;
1033                         continue;
1034                 }
1035
1036                 /* ignore merges */
1037                 if (commit->parents && commit->parents->next)
1038                         continue;
1039
1040                 if (ignore_if_in_upstream &&
1041                                 has_commit_patch_id(commit, &ids))
1042                         continue;
1043
1044                 nr++;
1045                 list = xrealloc(list, nr * sizeof(list[0]));
1046                 list[nr - 1] = commit;
1047         }
1048         total = nr;
1049         if (!keep_subject && auto_number && total > 1)
1050                 numbered = 1;
1051         if (numbered)
1052                 rev.total = total + start_number - 1;
1053         if (in_reply_to || thread || cover_letter)
1054                 rev.ref_message_ids = xcalloc(1, sizeof(struct string_list));
1055         if (in_reply_to) {
1056                 const char *msgid = clean_message_id(in_reply_to);
1057                 string_list_append(msgid, rev.ref_message_ids);
1058         }
1059         if (cover_letter) {
1060                 if (thread)
1061                         gen_message_id(&rev, "cover");
1062                 make_cover_letter(&rev, use_stdout, numbered, numbered_files,
1063                                   origin, nr, list, head);
1064                 total++;
1065                 start_number--;
1066         }
1067         rev.add_signoff = add_signoff;
1068         while (0 <= --nr) {
1069                 int shown;
1070                 commit = list[nr];
1071                 rev.nr = total - nr + (start_number - 1);
1072                 /* Make the second and subsequent mails replies to the first */
1073                 if (thread) {
1074                         /* Have we already had a message ID? */
1075                         if (rev.message_id) {
1076                                 /*
1077                                  * For deep threading: make every mail
1078                                  * a reply to the previous one, no
1079                                  * matter what other options are set.
1080                                  *
1081                                  * For shallow threading:
1082                                  *
1083                                  * Without --cover-letter and
1084                                  * --in-reply-to, make every mail a
1085                                  * reply to the one before.
1086                                  *
1087                                  * With --in-reply-to but no
1088                                  * --cover-letter, make every mail a
1089                                  * reply to the <reply-to>.
1090                                  *
1091                                  * With --cover-letter, make every
1092                                  * mail but the cover letter a reply
1093                                  * to the cover letter.  The cover
1094                                  * letter is a reply to the
1095                                  * --in-reply-to, if specified.
1096                                  */
1097                                 if (thread == THREAD_SHALLOW
1098                                     && rev.ref_message_ids->nr > 0
1099                                     && (!cover_letter || rev.nr > 1))
1100                                         free(rev.message_id);
1101                                 else
1102                                         string_list_append(rev.message_id,
1103                                                            rev.ref_message_ids);
1104                         }
1105                         gen_message_id(&rev, sha1_to_hex(commit->object.sha1));
1106                 }
1107                 if (!use_stdout && reopen_stdout(numbered_files ? NULL :
1108                                 get_oneline_for_filename(commit, keep_subject),
1109                                 rev.nr, rev.total))
1110                         die("Failed to create output files");
1111                 shown = log_tree_commit(&rev, commit);
1112                 free(commit->buffer);
1113                 commit->buffer = NULL;
1114
1115                 /* We put one extra blank line between formatted
1116                  * patches and this flag is used by log-tree code
1117                  * to see if it needs to emit a LF before showing
1118                  * the log; when using one file per patch, we do
1119                  * not want the extra blank line.
1120                  */
1121                 if (!use_stdout)
1122                         rev.shown_one = 0;
1123                 if (shown) {
1124                         if (rev.mime_boundary)
1125                                 printf("\n--%s%s--\n\n\n",
1126                                        mime_boundary_leader,
1127                                        rev.mime_boundary);
1128                         else
1129                                 printf("-- \n%s\n\n", git_version_string);
1130                 }
1131                 if (!use_stdout)
1132                         fclose(stdout);
1133         }
1134         free(list);
1135         if (ignore_if_in_upstream)
1136                 free_patch_ids(&ids);
1137         return 0;
1138 }
1139
1140 static int add_pending_commit(const char *arg, struct rev_info *revs, int flags)
1141 {
1142         unsigned char sha1[20];
1143         if (get_sha1(arg, sha1) == 0) {
1144                 struct commit *commit = lookup_commit_reference(sha1);
1145                 if (commit) {
1146                         commit->object.flags |= flags;
1147                         add_pending_object(revs, &commit->object, arg);
1148                         return 0;
1149                 }
1150         }
1151         return -1;
1152 }
1153
1154 static const char cherry_usage[] =
1155 "git cherry [-v] [<upstream> [<head> [<limit>]]]";
1156 int cmd_cherry(int argc, const char **argv, const char *prefix)
1157 {
1158         struct rev_info revs;
1159         struct patch_ids ids;
1160         struct commit *commit;
1161         struct commit_list *list = NULL;
1162         struct branch *current_branch;
1163         const char *upstream;
1164         const char *head = "HEAD";
1165         const char *limit = NULL;
1166         int verbose = 0;
1167
1168         if (argc > 1 && !strcmp(argv[1], "-v")) {
1169                 verbose = 1;
1170                 argc--;
1171                 argv++;
1172         }
1173
1174         switch (argc) {
1175         case 4:
1176                 limit = argv[3];
1177                 /* FALLTHROUGH */
1178         case 3:
1179                 head = argv[2];
1180                 /* FALLTHROUGH */
1181         case 2:
1182                 upstream = argv[1];
1183                 break;
1184         default:
1185                 current_branch = branch_get(NULL);
1186                 if (!current_branch || !current_branch->merge
1187                                         || !current_branch->merge[0]
1188                                         || !current_branch->merge[0]->dst) {
1189                         fprintf(stderr, "Could not find a tracked"
1190                                         " remote branch, please"
1191                                         " specify <upstream> manually.\n");
1192                         usage(cherry_usage);
1193                 }
1194
1195                 upstream = current_branch->merge[0]->dst;
1196         }
1197
1198         init_revisions(&revs, prefix);
1199         revs.diff = 1;
1200         revs.combine_merges = 0;
1201         revs.ignore_merges = 1;
1202         DIFF_OPT_SET(&revs.diffopt, RECURSIVE);
1203
1204         if (add_pending_commit(head, &revs, 0))
1205                 die("Unknown commit %s", head);
1206         if (add_pending_commit(upstream, &revs, UNINTERESTING))
1207                 die("Unknown commit %s", upstream);
1208
1209         /* Don't say anything if head and upstream are the same. */
1210         if (revs.pending.nr == 2) {
1211                 struct object_array_entry *o = revs.pending.objects;
1212                 if (hashcmp(o[0].item->sha1, o[1].item->sha1) == 0)
1213                         return 0;
1214         }
1215
1216         get_patch_ids(&revs, &ids, prefix);
1217
1218         if (limit && add_pending_commit(limit, &revs, UNINTERESTING))
1219                 die("Unknown commit %s", limit);
1220
1221         /* reverse the list of commits */
1222         if (prepare_revision_walk(&revs))
1223                 die("revision walk setup failed");
1224         while ((commit = get_revision(&revs)) != NULL) {
1225                 /* ignore merges */
1226                 if (commit->parents && commit->parents->next)
1227                         continue;
1228
1229                 commit_list_insert(commit, &list);
1230         }
1231
1232         while (list) {
1233                 char sign = '+';
1234
1235                 commit = list->item;
1236                 if (has_commit_patch_id(commit, &ids))
1237                         sign = '-';
1238
1239                 if (verbose) {
1240                         struct strbuf buf = STRBUF_INIT;
1241                         pretty_print_commit(CMIT_FMT_ONELINE, commit,
1242                                             &buf, 0, NULL, NULL, 0, 0);
1243                         printf("%c %s %s\n", sign,
1244                                sha1_to_hex(commit->object.sha1), buf.buf);
1245                         strbuf_release(&buf);
1246                 }
1247                 else {
1248                         printf("%c %s\n", sign,
1249                                sha1_to_hex(commit->object.sha1));
1250                 }
1251
1252                 list = list->next;
1253         }
1254
1255         free_patch_ids(&ids);
1256         return 0;
1257 }