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