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