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 "refs.h"
  18 #include "run-command.h"
  19 #include "shortlog.h"
  20
  21 static int default_show_root = 1;
  22 static const char *fmt_patch_subject_prefix = "PATCH";
  23
  24 static void add_name_decoration(const char *prefix, const char *name, struct object *obj)
  25 {
  26         int plen = strlen(prefix);
  27         int nlen = strlen(name);
  28         struct name_decoration *res = xmalloc(sizeof(struct name_decoration) + plen + nlen);
  29         memcpy(res->name, prefix, plen);
  30         memcpy(res->name + plen, name, nlen + 1);
  31         res->next = add_decoration(&name_decoration, obj, res);
  32 }
  33
  34 static int add_ref_decoration(const char *refname, const unsigned char *sha1, int flags, void *cb_data)
  35 {
  36         struct object *obj = parse_object(sha1);
  37         if (!obj)
  38                 return 0;
  39         add_name_decoration("", refname, obj);
  40         while (obj->type == OBJ_TAG) {
  41                 obj = ((struct tag *)obj)->tagged;
  42                 if (!obj)
  43                         break;
  44                 add_name_decoration("tag: ", refname, obj);
  45         }
  46         return 0;
  47 }
  48
  49 static void cmd_log_init(int argc, const char **argv, const char *prefix,
  50                       struct rev_info *rev)
  51 {
  52         int i;
  53         int decorate = 0;
  54
  55         rev->abbrev = DEFAULT_ABBREV;
  56         rev->commit_format = CMIT_FMT_DEFAULT;
  57         rev->verbose_header = 1;
  58         DIFF_OPT_SET(&rev->diffopt, RECURSIVE);
  59         rev->show_root_diff = default_show_root;
  60         rev->subject_prefix = fmt_patch_subject_prefix;
  61         argc = setup_revisions(argc, argv, rev, "HEAD");
  62         if (rev->diffopt.pickaxe || rev->diffopt.filter)
  63                 rev->always_show_header = 0;
  64         if (DIFF_OPT_TST(&rev->diffopt, FOLLOW_RENAMES)) {
  65                 rev->always_show_header = 0;
  66                 if (rev->diffopt.nr_paths != 1)
  67                         usage("git logs can only follow renames on one pathname at a time");
  68         }
  69         for (i = 1; i < argc; i++) {
  70                 const char *arg = argv[i];
  71                 if (!strcmp(arg, "--decorate")) {
  72                         if (!decorate)
  73                                 for_each_ref(add_ref_decoration, NULL);
  74                         decorate = 1;
  75                 } else
  76                         die("unrecognized argument: %s", arg);
  77         }
  78 }
  79
  80 /*
  81  * This gives a rough estimate for how many commits we
  82  * will print out in the list.
  83  */
  84 static int estimate_commit_count(struct rev_info *rev, struct commit_list *list)
  85 {
  86         int n = 0;
  87
  88         while (list) {
  89                 struct commit *commit = list->item;
  90                 unsigned int flags = commit->object.flags;
  91                 list = list->next;
  92                 if (!(flags & (TREESAME | UNINTERESTING)))
  93                         n++;
  94         }
  95         return n;
  96 }
  97
  98 static void show_early_header(struct rev_info *rev, const char *stage, int nr)
  99 {
 100         if (rev->shown_one) {
 101                 rev->shown_one = 0;
 102                 if (rev->commit_format != CMIT_FMT_ONELINE)
 103                         putchar(rev->diffopt.line_termination);
 104         }
 105         printf("Final output: %d %s\n", nr, stage);
 106 }
 107
 108 struct itimerval early_output_timer;
 109
 110 static void log_show_early(struct rev_info *revs, struct commit_list *list)
 111 {
 112         int i = revs->early_output;
 113         int show_header = 1;
 114
 115         sort_in_topological_order(&list, revs->lifo);
 116         while (list && i) {
 117                 struct commit *commit = list->item;
 118                 switch (simplify_commit(revs, commit)) {
 119                 case commit_show:
 120                         if (show_header) {
 121                                 int n = estimate_commit_count(revs, list);
 122                                 show_early_header(revs, "incomplete", n);
 123                                 show_header = 0;
 124                         }
 125                         log_tree_commit(revs, commit);
 126                         i--;
 127                         break;
 128                 case commit_ignore:
 129                         break;
 130                 case commit_error:
 131                         return;
 132                 }
 133                 list = list->next;
 134         }
 135
 136         /* Did we already get enough commits for the early output? */
 137         if (!i)
 138                 return;
 139
 140         /*
 141          * ..if no, then repeat it twice a second until we
 142          * do.
 143          *
 144          * NOTE! We don't use "it_interval", because if the
 145          * reader isn't listening, we want our output to be
 146          * throttled by the writing, and not have the timer
 147          * trigger every second even if we're blocked on a
 148          * reader!
 149          */
 150         early_output_timer.it_value.tv_sec = 0;
 151         early_output_timer.it_value.tv_usec = 500000;
 152         setitimer(ITIMER_REAL, &early_output_timer, NULL);
 153 }
 154
 155 static void early_output(int signal)
 156 {
 157         show_early_output = log_show_early;
 158 }
 159
 160 static void setup_early_output(struct rev_info *rev)
 161 {
 162         struct sigaction sa;
 163
 164         /*
 165          * Set up the signal handler, minimally intrusively:
 166          * we only set a single volatile integer word (not
 167          * using sigatomic_t - trying to avoid unnecessary
 168          * system dependencies and headers), and using
 169          * SA_RESTART.
 170          */
 171         memset(&sa, 0, sizeof(sa));
 172         sa.sa_handler = early_output;
 173         sigemptyset(&sa.sa_mask);
 174         sa.sa_flags = SA_RESTART;
 175         sigaction(SIGALRM, &sa, NULL);
 176
 177         /*
 178          * If we can get the whole output in less than a
 179          * tenth of a second, don't even bother doing the
 180          * early-output thing..
 181          *
 182          * This is a one-time-only trigger.
 183          */
 184         early_output_timer.it_value.tv_sec = 0;
 185         early_output_timer.it_value.tv_usec = 100000;
 186         setitimer(ITIMER_REAL, &early_output_timer, NULL);
 187 }
 188
 189 static void finish_early_output(struct rev_info *rev)
 190 {
 191         int n = estimate_commit_count(rev, rev->commits);
 192         signal(SIGALRM, SIG_IGN);
 193         show_early_header(rev, "done", n);
 194 }
 195
 196 static int cmd_log_walk(struct rev_info *rev)
 197 {
 198         struct commit *commit;
 199
 200         if (rev->early_output)
 201                 setup_early_output(rev);
 202
 203         if (prepare_revision_walk(rev))
 204                 die("revision walk setup failed");
 205
 206         if (rev->early_output)
 207                 finish_early_output(rev);
 208
 209         while ((commit = get_revision(rev)) != NULL) {
 210                 log_tree_commit(rev, commit);
 211                 if (!rev->reflog_info) {
 212                         /* we allow cycles in reflog ancestry */
 213                         free(commit->buffer);
 214                         commit->buffer = NULL;
 215                 }
 216                 free_commit_list(commit->parents);
 217                 commit->parents = NULL;
 218         }
 219         return 0;
 220 }
 221
 222 static int git_log_config(const char *var, const char *value)
 223 {
 224         if (!strcmp(var, "format.subjectprefix")) {
 225                 if (!value)
 226                         config_error_nonbool(var);
 227                 fmt_patch_subject_prefix = xstrdup(value);
 228                 return 0;
 229         }
 230         if (!strcmp(var, "log.showroot")) {
 231                 default_show_root = git_config_bool(var, value);
 232                 return 0;
 233         }
 234         return git_diff_ui_config(var, value);
 235 }
 236
 237 int cmd_whatchanged(int argc, const char **argv, const char *prefix)
 238 {
 239         struct rev_info rev;
 240
 241         git_config(git_log_config);
 242
 243         if (diff_use_color_default == -1)
 244                 diff_use_color_default = git_use_color_default;
 245
 246         init_revisions(&rev, prefix);
 247         rev.diff = 1;
 248         rev.simplify_history = 0;
 249         cmd_log_init(argc, argv, prefix, &rev);
 250         if (!rev.diffopt.output_format)
 251                 rev.diffopt.output_format = DIFF_FORMAT_RAW;
 252         return cmd_log_walk(&rev);
 253 }
 254
 255 static void show_tagger(char *buf, int len, struct rev_info *rev)
 256 {
 257         char *email_end, *p;
 258         unsigned long date;
 259         int tz;
 260
 261         email_end = memchr(buf, '>', len);
 262         if (!email_end)
 263                 return;
 264         p = ++email_end;
 265         while (isspace(*p))
 266                 p++;
 267         date = strtoul(p, &p, 10);
 268         while (isspace(*p))
 269                 p++;
 270         tz = (int)strtol(p, NULL, 10);
 271         printf("Tagger: %.*s\nDate:   %s\n", (int)(email_end - buf), buf,
 272                show_date(date, tz, rev->date_mode));
 273 }
 274
 275 static int show_object(const unsigned char *sha1, int show_tag_object,
 276         struct rev_info *rev)
 277 {
 278         unsigned long size;
 279         enum object_type type;
 280         char *buf = read_sha1_file(sha1, &type, &size);
 281         int offset = 0;
 282
 283         if (!buf)
 284                 return error("Could not read object %s", sha1_to_hex(sha1));
 285
 286         if (show_tag_object)
 287                 while (offset < size && buf[offset] != '\n') {
 288                         int new_offset = offset + 1;
 289                         while (new_offset < size && buf[new_offset++] != '\n')
 290                                 ; /* do nothing */
 291                         if (!prefixcmp(buf + offset, "tagger "))
 292                                 show_tagger(buf + offset + 7,
 293                                             new_offset - offset - 7, rev);
 294                         offset = new_offset;
 295                 }
 296
 297         if (offset < size)
 298                 fwrite(buf + offset, size - offset, 1, stdout);
 299         free(buf);
 300         return 0;
 301 }
 302
 303 static int show_tree_object(const unsigned char *sha1,
 304                 const char *base, int baselen,
 305                 const char *pathname, unsigned mode, int stage)
 306 {
 307         printf("%s%s\n", pathname, S_ISDIR(mode) ? "/" : "");
 308         return 0;
 309 }
 310
 311 int cmd_show(int argc, const char **argv, const char *prefix)
 312 {
 313         struct rev_info rev;
 314         struct object_array_entry *objects;
 315         int i, count, ret = 0;
 316
 317         git_config(git_log_config);
 318
 319         if (diff_use_color_default == -1)
 320                 diff_use_color_default = git_use_color_default;
 321
 322         init_revisions(&rev, prefix);
 323         rev.diff = 1;
 324         rev.combine_merges = 1;
 325         rev.dense_combined_merges = 1;
 326         rev.always_show_header = 1;
 327         rev.ignore_merges = 0;
 328         rev.no_walk = 1;
 329         cmd_log_init(argc, argv, prefix, &rev);
 330
 331         count = rev.pending.nr;
 332         objects = rev.pending.objects;
 333         for (i = 0; i < count && !ret; i++) {
 334                 struct object *o = objects[i].item;
 335                 const char *name = objects[i].name;
 336                 switch (o->type) {
 337                 case OBJ_BLOB:
 338                         ret = show_object(o->sha1, 0, NULL);
 339                         break;
 340                 case OBJ_TAG: {
 341                         struct tag *t = (struct tag *)o;
 342
 343                         printf("%stag %s%s\n",
 344                                         diff_get_color_opt(&rev.diffopt, DIFF_COMMIT),
 345                                         t->tag,
 346                                         diff_get_color_opt(&rev.diffopt, DIFF_RESET));
 347                         ret = show_object(o->sha1, 1, &rev);
 348                         objects[i].item = (struct object *)t->tagged;
 349                         i--;
 350                         break;
 351                 }
 352                 case OBJ_TREE:
 353                         printf("%stree %s%s\n\n",
 354                                         diff_get_color_opt(&rev.diffopt, DIFF_COMMIT),
 355                                         name,
 356                                         diff_get_color_opt(&rev.diffopt, DIFF_RESET));
 357                         read_tree_recursive((struct tree *)o, "", 0, 0, NULL,
 358                                         show_tree_object);
 359                         break;
 360                 case OBJ_COMMIT:
 361                         rev.pending.nr = rev.pending.alloc = 0;
 362                         rev.pending.objects = NULL;
 363                         add_object_array(o, name, &rev.pending);
 364                         ret = cmd_log_walk(&rev);
 365                         break;
 366                 default:
 367                         ret = error("Unknown type: %d", o->type);
 368                 }
 369         }
 370         free(objects);
 371         return ret;
 372 }
 373
 374 /*
 375  * This is equivalent to "git log -g --abbrev-commit --pretty=oneline"
 376  */
 377 int cmd_log_reflog(int argc, const char **argv, const char *prefix)
 378 {
 379         struct rev_info rev;
 380
 381         git_config(git_log_config);
 382
 383         if (diff_use_color_default == -1)
 384                 diff_use_color_default = git_use_color_default;
 385
 386         init_revisions(&rev, prefix);
 387         init_reflog_walk(&rev.reflog_info);
 388         rev.abbrev_commit = 1;
 389         rev.verbose_header = 1;
 390         cmd_log_init(argc, argv, prefix, &rev);
 391
 392         /*
 393          * This means that we override whatever commit format the user gave
 394          * on the cmd line.  Sad, but cmd_log_init() currently doesn't
 395          * allow us to set a different default.
 396          */
 397         rev.commit_format = CMIT_FMT_ONELINE;
 398         rev.always_show_header = 1;
 399
 400         /*
 401          * We get called through "git reflog", so unlike the other log
 402          * routines, we need to set up our pager manually..
 403          */
 404         setup_pager();
 405
 406         return cmd_log_walk(&rev);
 407 }
 408
 409 int cmd_log(int argc, const char **argv, const char *prefix)
 410 {
 411         struct rev_info rev;
 412
 413         git_config(git_log_config);
 414
 415         if (diff_use_color_default == -1)
 416                 diff_use_color_default = git_use_color_default;
 417
 418         init_revisions(&rev, prefix);
 419         rev.always_show_header = 1;
 420         cmd_log_init(argc, argv, prefix, &rev);
 421         return cmd_log_walk(&rev);
 422 }
 423
 424 /* format-patch */
 425 #define FORMAT_PATCH_NAME_MAX 64
 426
 427 static int istitlechar(char c)
 428 {
 429         return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') ||
 430                 (c >= '0' && c <= '9') || c == '.' || c == '_';
 431 }
 432
 433 static const char *fmt_patch_suffix = ".patch";
 434 static int numbered = 0;
 435 static int auto_number = 0;
 436
 437 static char **extra_hdr;
 438 static int extra_hdr_nr;
 439 static int extra_hdr_alloc;
 440
 441 static char **extra_to;
 442 static int extra_to_nr;
 443 static int extra_to_alloc;
 444
 445 static char **extra_cc;
 446 static int extra_cc_nr;
 447 static int extra_cc_alloc;
 448
 449 static void add_header(const char *value)
 450 {
 451         int len = strlen(value);
 452         while (value[len - 1] == '\n')
 453                 len--;
 454         if (!strncasecmp(value, "to: ", 4)) {
 455                 ALLOC_GROW(extra_to, extra_to_nr + 1, extra_to_alloc);
 456                 extra_to[extra_to_nr++] = xstrndup(value + 4, len - 4);
 457                 return;
 458         }
 459         if (!strncasecmp(value, "cc: ", 4)) {
 460                 ALLOC_GROW(extra_cc, extra_cc_nr + 1, extra_cc_alloc);
 461                 extra_cc[extra_cc_nr++] = xstrndup(value + 4, len - 4);
 462                 return;
 463         }
 464         ALLOC_GROW(extra_hdr, extra_hdr_nr + 1, extra_hdr_alloc);
 465         extra_hdr[extra_hdr_nr++] = xstrndup(value, len);
 466 }
 467
 468 static int git_format_config(const char *var, const char *value)
 469 {
 470         if (!strcmp(var, "format.headers")) {
 471                 if (!value)
 472                         die("format.headers without value");
 473                 add_header(value);
 474                 return 0;
 475         }
 476         if (!strcmp(var, "format.suffix")) {
 477                 if (!value)
 478                         return config_error_nonbool(var);
 479                 fmt_patch_suffix = xstrdup(value);
 480                 return 0;
 481         }
 482         if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
 483                 return 0;
 484         }
 485         if (!strcmp(var, "format.numbered")) {
 486                 if (value && !strcasecmp(value, "auto")) {
 487                         auto_number = 1;
 488                         return 0;
 489                 }
 490                 numbered = git_config_bool(var, value);
 491                 return 0;
 492         }
 493
 494         return git_log_config(var, value);
 495 }
 496
 497
 498 static const char *get_oneline_for_filename(struct commit *commit,
 499                                             int keep_subject)
 500 {
 501         static char filename[PATH_MAX];
 502         char *sol;
 503         int len = 0;
 504         int suffix_len = strlen(fmt_patch_suffix) + 1;
 505
 506         sol = strstr(commit->buffer, "\n\n");
 507         if (!sol)
 508                 filename[0] = '\0';
 509         else {
 510                 int j, space = 0;
 511
 512                 sol += 2;
 513                 /* strip [PATCH] or [PATCH blabla] */
 514                 if (!keep_subject && !prefixcmp(sol, "[PATCH")) {
 515                         char *eos = strchr(sol + 6, ']');
 516                         if (eos) {
 517                                 while (isspace(*eos))
 518                                         eos++;
 519                                 sol = eos;
 520                         }
 521                 }
 522
 523                 for (j = 0;
 524                      j < FORMAT_PATCH_NAME_MAX - suffix_len - 5 &&
 525                              len < sizeof(filename) - suffix_len &&
 526                              sol[j] && sol[j] != '\n';
 527                      j++) {
 528                         if (istitlechar(sol[j])) {
 529                                 if (space) {
 530                                         filename[len++] = '-';
 531                                         space = 0;
 532                                 }
 533                                 filename[len++] = sol[j];
 534                                 if (sol[j] == '.')
 535                                         while (sol[j + 1] == '.')
 536                                                 j++;
 537                         } else
 538                                 space = 1;
 539                 }
 540                 while (filename[len - 1] == '.'
 541                        || filename[len - 1] == '-')
 542                         len--;
 543                 filename[len] = '\0';
 544         }
 545         return filename;
 546 }
 547
 548 static FILE *realstdout = NULL;
 549 static const char *output_directory = NULL;
 550
 551 static int reopen_stdout(const char *oneline, int nr, int total)
 552 {
 553         char filename[PATH_MAX];
 554         int len = 0;
 555         int suffix_len = strlen(fmt_patch_suffix) + 1;
 556
 557         if (output_directory) {
 558                 len = snprintf(filename, sizeof(filename), "%s",
 559                                 output_directory);
 560                 if (len >=
 561                     sizeof(filename) - FORMAT_PATCH_NAME_MAX - suffix_len)
 562                         return error("name of output directory is too long");
 563                 if (filename[len - 1] != '/')
 564                         filename[len++] = '/';
 565         }
 566
 567         if (!oneline)
 568                 len += sprintf(filename + len, "%d", nr);
 569         else {
 570                 len += sprintf(filename + len, "%04d-", nr);
 571                 len += snprintf(filename + len, sizeof(filename) - len - 1
 572                                 - suffix_len, "%s", oneline);
 573                 strcpy(filename + len, fmt_patch_suffix);
 574         }
 575
 576         fprintf(realstdout, "%s\n", filename);
 577         if (freopen(filename, "w", stdout) == NULL)
 578                 return error("Cannot open patch file %s",filename);
 579
 580         return 0;
 581 }
 582
 583 static void get_patch_ids(struct rev_info *rev, struct patch_ids *ids, const char *prefix)
 584 {
 585         struct rev_info check_rev;
 586         struct commit *commit;
 587         struct object *o1, *o2;
 588         unsigned flags1, flags2;
 589
 590         if (rev->pending.nr != 2)
 591                 die("Need exactly one range.");
 592
 593         o1 = rev->pending.objects[0].item;
 594         flags1 = o1->flags;
 595         o2 = rev->pending.objects[1].item;
 596         flags2 = o2->flags;
 597
 598         if ((flags1 & UNINTERESTING) == (flags2 & UNINTERESTING))
 599                 die("Not a range.");
 600
 601         init_patch_ids(ids);
 602
 603         /* given a range a..b get all patch ids for b..a */
 604         init_revisions(&check_rev, prefix);
 605         o1->flags ^= UNINTERESTING;
 606         o2->flags ^= UNINTERESTING;
 607         add_pending_object(&check_rev, o1, "o1");
 608         add_pending_object(&check_rev, o2, "o2");
 609         if (prepare_revision_walk(&check_rev))
 610                 die("revision walk setup failed");
 611
 612         while ((commit = get_revision(&check_rev)) != NULL) {
 613                 /* ignore merges */
 614                 if (commit->parents && commit->parents->next)
 615                         continue;
 616
 617                 add_commit_patch_id(commit, ids);
 618         }
 619
 620         /* reset for next revision walk */
 621         clear_commit_marks((struct commit *)o1,
 622                         SEEN | UNINTERESTING | SHOWN | ADDED);
 623         clear_commit_marks((struct commit *)o2,
 624                         SEEN | UNINTERESTING | SHOWN | ADDED);
 625         o1->flags = flags1;
 626         o2->flags = flags2;
 627 }
 628
 629 static void gen_message_id(struct rev_info *info, char *base)
 630 {
 631         const char *committer = git_committer_info(IDENT_WARN_ON_NO_NAME);
 632         const char *email_start = strrchr(committer, '<');
 633         const char *email_end = strrchr(committer, '>');
 634         struct strbuf buf;
 635         if (!email_start || !email_end || email_start > email_end - 1)
 636                 die("Could not extract email from committer identity.");
 637         strbuf_init(&buf, 0);
 638         strbuf_addf(&buf, "%s.%lu.git.%.*s", base,
 639                     (unsigned long) time(NULL),
 640                     (int)(email_end - email_start - 1), email_start + 1);
 641         info->message_id = strbuf_detach(&buf, NULL);
 642 }
 643
 644 static void make_cover_letter(struct rev_info *rev, int use_stdout,
 645                               int numbered, int numbered_files,
 646                               struct commit *origin,
 647                               int nr, struct commit **list, struct commit *head)
 648 {
 649         const char *committer;
 650         const char *origin_sha1, *head_sha1;
 651         const char *argv[7];
 652         const char *subject_start = NULL;
 653         const char *body = "*** SUBJECT HERE ***\n\n*** BLURB HERE ***\n";
 654         const char *msg;
 655         const char *extra_headers = rev->extra_headers;
 656         struct shortlog log;
 657         struct strbuf sb;
 658         int i;
 659         const char *encoding = "utf-8";
 660
 661         if (rev->commit_format != CMIT_FMT_EMAIL)
 662                 die("Cover letter needs email format");
 663
 664         if (!use_stdout && reopen_stdout(numbered_files ?
 665                                 NULL : "cover-letter", 0, rev->total))
 666                 return;
 667
 668         head_sha1 = sha1_to_hex(head->object.sha1);
 669
 670         log_write_email_headers(rev, head_sha1, &subject_start, &extra_headers);
 671
 672         committer = git_committer_info(0);
 673
 674         msg = body;
 675         strbuf_init(&sb, 0);
 676         pp_user_info(NULL, CMIT_FMT_EMAIL, &sb, committer, DATE_RFC2822,
 677                      encoding);
 678         pp_title_line(CMIT_FMT_EMAIL, &msg, &sb, subject_start, extra_headers,
 679                       encoding, 0);
 680         pp_remainder(CMIT_FMT_EMAIL, &msg, &sb, 0);
 681         printf("%s\n", sb.buf);
 682
 683         strbuf_release(&sb);
 684
 685         shortlog_init(&log);
 686         for (i = 0; i < nr; i++)
 687                 shortlog_add_commit(&log, list[i]);
 688
 689         shortlog_output(&log);
 690
 691         /*
 692          * We can only do diffstat with a unique reference point
 693          */
 694         if (!origin)
 695                 return;
 696
 697         origin_sha1 = sha1_to_hex(origin->object.sha1);
 698
 699         argv[0] = "diff";
 700         argv[1] = "--stat";
 701         argv[2] = "--summary";
 702         argv[3] = head_sha1;
 703         argv[4] = "--not";
 704         argv[5] = origin_sha1;
 705         argv[6] = "--";
 706         argv[7] = NULL;
 707         fflush(stdout);
 708         run_command_v_opt(argv, RUN_GIT_CMD);
 709
 710         fflush(stdout);
 711         printf("\n");
 712 }
 713
 714 static const char *clean_message_id(const char *msg_id)
 715 {
 716         char ch;
 717         const char *a, *z, *m;
 718
 719         m = msg_id;
 720         while ((ch = *m) && (isspace(ch) || (ch == '<')))
 721                 m++;
 722         a = m;
 723         z = NULL;
 724         while ((ch = *m)) {
 725                 if (!isspace(ch) && (ch != '>'))
 726                         z = m;
 727                 m++;
 728         }
 729         if (!z)
 730                 die("insane in-reply-to: %s", msg_id);
 731         if (++z == m)
 732                 return a;
 733         return xmemdupz(a, z - a);
 734 }
 735
 736 int cmd_format_patch(int argc, const char **argv, const char *prefix)
 737 {
 738         struct commit *commit;
 739         struct commit **list = NULL;
 740         struct rev_info rev;
 741         int nr = 0, total, i, j;
 742         int use_stdout = 0;
 743         int start_number = -1;
 744         int keep_subject = 0;
 745         int numbered_files = 0;         /* _just_ numbers */
 746         int subject_prefix = 0;
 747         int ignore_if_in_upstream = 0;
 748         int thread = 0;
 749         int cover_letter = 0;
 750         int boundary_count = 0;
 751         struct commit *origin = NULL, *head = NULL;
 752         const char *in_reply_to = NULL;
 753         struct patch_ids ids;
 754         char *add_signoff = NULL;
 755         struct strbuf buf;
 756
 757         git_config(git_format_config);
 758         init_revisions(&rev, prefix);
 759         rev.commit_format = CMIT_FMT_EMAIL;
 760         rev.verbose_header = 1;
 761         rev.diff = 1;
 762         rev.combine_merges = 0;
 763         rev.ignore_merges = 1;
 764         rev.diffopt.msg_sep = "";
 765         DIFF_OPT_SET(&rev.diffopt, RECURSIVE);
 766
 767         rev.subject_prefix = fmt_patch_subject_prefix;
 768
 769         /*
 770          * Parse the arguments before setup_revisions(), or something
 771          * like "git format-patch -o a123 HEAD^.." may fail; a123 is
 772          * possibly a valid SHA1.
 773          */
 774         for (i = 1, j = 1; i < argc; i++) {
 775                 if (!strcmp(argv[i], "--stdout"))
 776                         use_stdout = 1;
 777                 else if (!strcmp(argv[i], "-n") ||
 778                                 !strcmp(argv[i], "--numbered"))
 779                         numbered = 1;
 780                 else if (!strcmp(argv[i], "-N") ||
 781                                 !strcmp(argv[i], "--no-numbered")) {
 782                         numbered = 0;
 783                         auto_number = 0;
 784                 }
 785                 else if (!prefixcmp(argv[i], "--start-number="))
 786                         start_number = strtol(argv[i] + 15, NULL, 10);
 787                 else if (!strcmp(argv[i], "--numbered-files"))
 788                         numbered_files = 1;
 789                 else if (!strcmp(argv[i], "--start-number")) {
 790                         i++;
 791                         if (i == argc)
 792                                 die("Need a number for --start-number");
 793                         start_number = strtol(argv[i], NULL, 10);
 794                 }
 795                 else if (!prefixcmp(argv[i], "--cc=")) {
 796                         ALLOC_GROW(extra_cc, extra_cc_nr + 1, extra_cc_alloc);
 797                         extra_cc[extra_cc_nr++] = xstrdup(argv[i] + 5);
 798                 }
 799                 else if (!strcmp(argv[i], "-k") ||
 800                                 !strcmp(argv[i], "--keep-subject")) {
 801                         keep_subject = 1;
 802                         rev.total = -1;
 803                 }
 804                 else if (!strcmp(argv[i], "--output-directory") ||
 805                          !strcmp(argv[i], "-o")) {
 806                         i++;
 807                         if (argc <= i)
 808                                 die("Which directory?");
 809                         if (output_directory)
 810                                 die("Two output directories?");
 811                         output_directory = argv[i];
 812                 }
 813                 else if (!strcmp(argv[i], "--signoff") ||
 814                          !strcmp(argv[i], "-s")) {
 815                         const char *committer;
 816                         const char *endpos;
 817                         committer = git_committer_info(IDENT_ERROR_ON_NO_NAME);
 818                         endpos = strchr(committer, '>');
 819                         if (!endpos)
 820                                 die("bogos committer info %s\n", committer);
 821                         add_signoff = xmemdupz(committer, endpos - committer + 1);
 822                 }
 823                 else if (!strcmp(argv[i], "--attach")) {
 824                         rev.mime_boundary = git_version_string;
 825                         rev.no_inline = 1;
 826                 }
 827                 else if (!prefixcmp(argv[i], "--attach=")) {
 828                         rev.mime_boundary = argv[i] + 9;
 829                         rev.no_inline = 1;
 830                 }
 831                 else if (!strcmp(argv[i], "--inline")) {
 832                         rev.mime_boundary = git_version_string;
 833                         rev.no_inline = 0;
 834                 }
 835                 else if (!prefixcmp(argv[i], "--inline=")) {
 836                         rev.mime_boundary = argv[i] + 9;
 837                         rev.no_inline = 0;
 838                 }
 839                 else if (!strcmp(argv[i], "--ignore-if-in-upstream"))
 840                         ignore_if_in_upstream = 1;
 841                 else if (!strcmp(argv[i], "--thread"))
 842                         thread = 1;
 843                 else if (!prefixcmp(argv[i], "--in-reply-to="))
 844                         in_reply_to = argv[i] + 14;
 845                 else if (!strcmp(argv[i], "--in-reply-to")) {
 846                         i++;
 847                         if (i == argc)
 848                                 die("Need a Message-Id for --in-reply-to");
 849                         in_reply_to = argv[i];
 850                 } else if (!prefixcmp(argv[i], "--subject-prefix=")) {
 851                         subject_prefix = 1;
 852                         rev.subject_prefix = argv[i] + 17;
 853                 } else if (!prefixcmp(argv[i], "--suffix="))
 854                         fmt_patch_suffix = argv[i] + 9;
 855                 else if (!strcmp(argv[i], "--cover-letter"))
 856                         cover_letter = 1;
 857                 else
 858                         argv[j++] = argv[i];
 859         }
 860         argc = j;
 861
 862         strbuf_init(&buf, 0);
 863
 864         for (i = 0; i < extra_hdr_nr; i++) {
 865                 strbuf_addstr(&buf, extra_hdr[i]);
 866                 strbuf_addch(&buf, '\n');
 867         }
 868
 869         if (extra_to_nr)
 870                 strbuf_addstr(&buf, "To: ");
 871         for (i = 0; i < extra_to_nr; i++) {
 872                 if (i)
 873                         strbuf_addstr(&buf, "    ");
 874                 strbuf_addstr(&buf, extra_to[i]);
 875                 if (i + 1 < extra_to_nr)
 876                         strbuf_addch(&buf, ',');
 877                 strbuf_addch(&buf, '\n');
 878         }
 879
 880         if (extra_cc_nr)
 881                 strbuf_addstr(&buf, "Cc: ");
 882         for (i = 0; i < extra_cc_nr; i++) {
 883                 if (i)
 884                         strbuf_addstr(&buf, "    ");
 885                 strbuf_addstr(&buf, extra_cc[i]);
 886                 if (i + 1 < extra_cc_nr)
 887                         strbuf_addch(&buf, ',');
 888                 strbuf_addch(&buf, '\n');
 889         }
 890
 891         rev.extra_headers = strbuf_detach(&buf, 0);
 892
 893         if (start_number < 0)
 894                 start_number = 1;
 895         if (numbered && keep_subject)
 896                 die ("-n and -k are mutually exclusive.");
 897         if (keep_subject && subject_prefix)
 898                 die ("--subject-prefix and -k are mutually exclusive.");
 899         if (numbered_files && use_stdout)
 900                 die ("--numbered-files and --stdout are mutually exclusive.");
 901
 902         argc = setup_revisions(argc, argv, &rev, "HEAD");
 903         if (argc > 1)
 904                 die ("unrecognized argument: %s", argv[1]);
 905
 906         if (!rev.diffopt.output_format)
 907                 rev.diffopt.output_format = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_SUMMARY | DIFF_FORMAT_PATCH;
 908
 909         if (!DIFF_OPT_TST(&rev.diffopt, TEXT))
 910                 DIFF_OPT_SET(&rev.diffopt, BINARY);
 911
 912         if (!output_directory && !use_stdout)
 913                 output_directory = prefix;
 914
 915         if (output_directory) {
 916                 if (use_stdout)
 917                         die("standard output, or directory, which one?");
 918                 if (mkdir(output_directory, 0777) < 0 && errno != EEXIST)
 919                         die("Could not create directory %s",
 920                             output_directory);
 921         }
 922
 923         if (rev.pending.nr == 1) {
 924                 if (rev.max_count < 0 && !rev.show_root_diff) {
 925                         /*
 926                          * This is traditional behaviour of "git format-patch
 927                          * origin" that prepares what the origin side still
 928                          * does not have.
 929                          */
 930                         rev.pending.objects[0].item->flags |= UNINTERESTING;
 931                         add_head_to_pending(&rev);
 932                 }
 933                 /*
 934                  * Otherwise, it is "format-patch -22 HEAD", and/or
 935                  * "format-patch --root HEAD".  The user wants
 936                  * get_revision() to do the usual traversal.
 937                  */
 938         }
 939         if (cover_letter) {
 940                 /* remember the range */
 941                 int i;
 942                 for (i = 0; i < rev.pending.nr; i++) {
 943                         struct object *o = rev.pending.objects[i].item;
 944                         if (!(o->flags & UNINTERESTING))
 945                                 head = (struct commit *)o;
 946                 }
 947                 /* We can't generate a cover letter without any patches */
 948                 if (!head)
 949                         return 0;
 950         }
 951
 952         if (ignore_if_in_upstream)
 953                 get_patch_ids(&rev, &ids, prefix);
 954
 955         if (!use_stdout)
 956                 realstdout = xfdopen(xdup(1), "w");
 957
 958         if (prepare_revision_walk(&rev))
 959                 die("revision walk setup failed");
 960         rev.boundary = 1;
 961         while ((commit = get_revision(&rev)) != NULL) {
 962                 if (commit->object.flags & BOUNDARY) {
 963                         fprintf(stderr, "Boundary %s\n", sha1_to_hex(commit->object.sha1));
 964                         boundary_count++;
 965                         origin = (boundary_count == 1) ? commit : NULL;
 966                         continue;
 967                 }
 968
 969                 /* ignore merges */
 970                 if (commit->parents && commit->parents->next)
 971                         continue;
 972
 973                 if (ignore_if_in_upstream &&
 974                                 has_commit_patch_id(commit, &ids))
 975                         continue;
 976
 977                 nr++;
 978                 list = xrealloc(list, nr * sizeof(list[0]));
 979                 list[nr - 1] = commit;
 980         }
 981         total = nr;
 982         if (!keep_subject && auto_number && total > 1)
 983                 numbered = 1;
 984         if (numbered)
 985                 rev.total = total + start_number - 1;
 986         if (in_reply_to)
 987                 rev.ref_message_id = clean_message_id(in_reply_to);
 988         if (cover_letter) {
 989                 if (thread)
 990                         gen_message_id(&rev, "cover");
 991                 make_cover_letter(&rev, use_stdout, numbered, numbered_files,
 992                                   origin, nr, list, head);
 993                 total++;
 994                 start_number--;
 995         }
 996         rev.add_signoff = add_signoff;
 997         while (0 <= --nr) {
 998                 int shown;
 999                 commit = list[nr];
1000                 rev.nr = total - nr + (start_number - 1);
1001                 /* Make the second and subsequent mails replies to the first */
1002                 if (thread) {
1003                         /* Have we already had a message ID? */
1004                         if (rev.message_id) {
1005                                 /*
1006                                  * If we've got the ID to be a reply
1007                                  * to, discard the current ID;
1008                                  * otherwise, make everything a reply
1009                                  * to that.
1010                                  */
1011                                 if (rev.ref_message_id)
1012                                         free(rev.message_id);
1013                                 else
1014                                         rev.ref_message_id = rev.message_id;
1015                         }
1016                         gen_message_id(&rev, sha1_to_hex(commit->object.sha1));
1017                 }
1018                 if (!use_stdout && reopen_stdout(numbered_files ? NULL :
1019                                 get_oneline_for_filename(commit, keep_subject),
1020                                 rev.nr, rev.total))
1021                         die("Failed to create output files");
1022                 shown = log_tree_commit(&rev, commit);
1023                 free(commit->buffer);
1024                 commit->buffer = NULL;
1025
1026                 /* We put one extra blank line between formatted
1027                  * patches and this flag is used by log-tree code
1028                  * to see if it needs to emit a LF before showing
1029                  * the log; when using one file per patch, we do
1030                  * not want the extra blank line.
1031                  */
1032                 if (!use_stdout)
1033                         rev.shown_one = 0;
1034                 if (shown) {
1035                         if (rev.mime_boundary)
1036                                 printf("\n--%s%s--\n\n\n",
1037                                        mime_boundary_leader,
1038                                        rev.mime_boundary);
1039                         else
1040                                 printf("-- \n%s\n\n", git_version_string);
1041                 }
1042                 if (!use_stdout)
1043                         fclose(stdout);
1044         }
1045         free(list);
1046         if (ignore_if_in_upstream)
1047                 free_patch_ids(&ids);
1048         return 0;
1049 }
1050
1051 static int add_pending_commit(const char *arg, struct rev_info *revs, int flags)
1052 {
1053         unsigned char sha1[20];
1054         if (get_sha1(arg, sha1) == 0) {
1055                 struct commit *commit = lookup_commit_reference(sha1);
1056                 if (commit) {
1057                         commit->object.flags |= flags;
1058                         add_pending_object(revs, &commit->object, arg);
1059                         return 0;
1060                 }
1061         }
1062         return -1;
1063 }
1064
1065 static const char cherry_usage[] =
1066 "git-cherry [-v] <upstream> [<head>] [<limit>]";
1067 int cmd_cherry(int argc, const char **argv, const char *prefix)
1068 {
1069         struct rev_info revs;
1070         struct patch_ids ids;
1071         struct commit *commit;
1072         struct commit_list *list = NULL;
1073         const char *upstream;
1074         const char *head = "HEAD";
1075         const char *limit = NULL;
1076         int verbose = 0;
1077
1078         if (argc > 1 && !strcmp(argv[1], "-v")) {
1079                 verbose = 1;
1080                 argc--;
1081                 argv++;
1082         }
1083
1084         switch (argc) {
1085         case 4:
1086                 limit = argv[3];
1087                 /* FALLTHROUGH */
1088         case 3:
1089                 head = argv[2];
1090                 /* FALLTHROUGH */
1091         case 2:
1092                 upstream = argv[1];
1093                 break;
1094         default:
1095                 usage(cherry_usage);
1096         }
1097
1098         init_revisions(&revs, prefix);
1099         revs.diff = 1;
1100         revs.combine_merges = 0;
1101         revs.ignore_merges = 1;
1102         DIFF_OPT_SET(&revs.diffopt, RECURSIVE);
1103
1104         if (add_pending_commit(head, &revs, 0))
1105                 die("Unknown commit %s", head);
1106         if (add_pending_commit(upstream, &revs, UNINTERESTING))
1107                 die("Unknown commit %s", upstream);
1108
1109         /* Don't say anything if head and upstream are the same. */
1110         if (revs.pending.nr == 2) {
1111                 struct object_array_entry *o = revs.pending.objects;
1112                 if (hashcmp(o[0].item->sha1, o[1].item->sha1) == 0)
1113                         return 0;
1114         }
1115
1116         get_patch_ids(&revs, &ids, prefix);
1117
1118         if (limit && add_pending_commit(limit, &revs, UNINTERESTING))
1119                 die("Unknown commit %s", limit);
1120
1121         /* reverse the list of commits */
1122         if (prepare_revision_walk(&revs))
1123                 die("revision walk setup failed");
1124         while ((commit = get_revision(&revs)) != NULL) {
1125                 /* ignore merges */
1126                 if (commit->parents && commit->parents->next)
1127                         continue;
1128
1129                 commit_list_insert(commit, &list);
1130         }
1131
1132         while (list) {
1133                 char sign = '+';
1134
1135                 commit = list->item;
1136                 if (has_commit_patch_id(commit, &ids))
1137                         sign = '-';
1138
1139                 if (verbose) {
1140                         struct strbuf buf;
1141                         strbuf_init(&buf, 0);
1142                         pretty_print_commit(CMIT_FMT_ONELINE, commit,
1143                                             &buf, 0, NULL, NULL, 0, 0);
1144                         printf("%c %s %s\n", sign,
1145                                sha1_to_hex(commit->object.sha1), buf.buf);
1146                         strbuf_release(&buf);
1147                 }
1148                 else {
1149                         printf("%c %s\n", sign,
1150                                sha1_to_hex(commit->object.sha1));
1151                 }
1152
1153                 list = list->next;
1154         }
1155
1156         free_patch_ids(&ids);
1157         return 0;
1158 }