builtin-log.c

   1 /*
   2  * Builtin "git log" and related commands (show, whatchanged)
   3  *
   4  * (C) Copyright 2006 Linus Torvalds
   5  *               2006 Junio Hamano
   6  */
   7 #include "cache.h"
   8 #include "color.h"
   9 #include "commit.h"
  10 #include "diff.h"
  11 #include "revision.h"
  12 #include "log-tree.h"
  13 #include "builtin.h"
  14 #include "tag.h"
  15 #include "reflog-walk.h"
  16 #include "patch-ids.h"
  17 #include "run-command.h"
  18 #include "shortlog.h"
  19 #include "remote.h"
  20
  21 /* Set a default date-time format for git log ("log.date" config variable) */
  22 static const char *default_date_mode = NULL;
  23
  24 static int default_show_root = 1;
  25 static const char *fmt_patch_subject_prefix = "PATCH";
  26 static const char *fmt_pretty;
  27
  28 static void cmd_log_init(int argc, const char **argv, const char *prefix,
  29                       struct rev_info *rev)
  30 {
  31         int i;
  32
  33         rev->abbrev = DEFAULT_ABBREV;
  34         rev->commit_format = CMIT_FMT_DEFAULT;
  35         if (fmt_pretty)
  36                 get_commit_format(fmt_pretty, rev);
  37         rev->verbose_header = 1;
  38         DIFF_OPT_SET(&rev->diffopt, RECURSIVE);
  39         rev->show_root_diff = default_show_root;
  40         rev->subject_prefix = fmt_patch_subject_prefix;
  41         DIFF_OPT_SET(&rev->diffopt, ALLOW_TEXTCONV);
  42
  43         if (default_date_mode)
  44                 rev->date_mode = parse_date_format(default_date_mode);
  45
  46         argc = setup_revisions(argc, argv, rev, "HEAD");
  47
  48         if (rev->diffopt.pickaxe || rev->diffopt.filter)
  49                 rev->always_show_header = 0;
  50         if (DIFF_OPT_TST(&rev->diffopt, FOLLOW_RENAMES)) {
  51                 rev->always_show_header = 0;
  52                 if (rev->diffopt.nr_paths != 1)
  53                         usage("git logs can only follow renames on one pathname at a time");
  54         }
  55         for (i = 1; i < argc; i++) {
  56                 const char *arg = argv[i];
  57                 if (!strcmp(arg, "--decorate")) {
  58                         load_ref_decorations();
  59                         rev->show_decorations = 1;
  60                 } else if (!strcmp(arg, "--source")) {
  61                         rev->show_source = 1;
  62                 } else
  63                         die("unrecognized argument: %s", arg);
  64         }
  65 }
  66
  67 /*
  68  * This gives a rough estimate for how many commits we
  69  * will print out in the list.
  70  */
  71 static int estimate_commit_count(struct rev_info *rev, struct commit_list *list)
  72 {
  73         int n = 0;
  74
  75         while (list) {
  76                 struct commit *commit = list->item;
  77                 unsigned int flags = commit->object.flags;
  78                 list = list->next;
  79                 if (!(flags & (TREESAME | UNINTERESTING)))
  80                         n++;
  81         }
  82         return n;
  83 }
  84
  85 static void show_early_header(struct rev_info *rev, const char *stage, int nr)
  86 {
  87         if (rev->shown_one) {
  88                 rev->shown_one = 0;
  89                 if (rev->commit_format != CMIT_FMT_ONELINE)
  90                         putchar(rev->diffopt.line_termination);
  91         }
  92         printf("Final output: %d %s\n", nr, stage);
  93 }
  94
  95 struct itimerval early_output_timer;
  96
  97 static void log_show_early(struct rev_info *revs, struct commit_list *list)
  98 {
  99         int i = revs->early_output;
 100         int show_header = 1;
 101
 102         sort_in_topological_order(&list, revs->lifo);
 103         while (list && i) {
 104                 struct commit *commit = list->item;
 105                 switch (simplify_commit(revs, commit)) {
 106                 case commit_show:
 107                         if (show_header) {
 108                                 int n = estimate_commit_count(revs, list);
 109                                 show_early_header(revs, "incomplete", n);
 110                                 show_header = 0;
 111                         }
 112                         log_tree_commit(revs, commit);
 113                         i--;
 114                         break;
 115                 case commit_ignore:
 116                         break;
 117                 case commit_error:
 118                         return;
 119                 }
 120                 list = list->next;
 121         }
 122
 123         /* Did we already get enough commits for the early output? */
 124         if (!i)
 125                 return;
 126
 127         /*
 128          * ..if no, then repeat it twice a second until we
 129          * do.
 130          *
 131          * NOTE! We don't use "it_interval", because if the
 132          * reader isn't listening, we want our output to be
 133          * throttled by the writing, and not have the timer
 134          * trigger every second even if we're blocked on a
 135          * reader!
 136          */
 137         early_output_timer.it_value.tv_sec = 0;
 138         early_output_timer.it_value.tv_usec = 500000;
 139         setitimer(ITIMER_REAL, &early_output_timer, NULL);
 140 }
 141
 142 static void early_output(int signal)
 143 {
 144         show_early_output = log_show_early;
 145 }
 146
 147 static void setup_early_output(struct rev_info *rev)
 148 {
 149         struct sigaction sa;
 150
 151         /*
 152          * Set up the signal handler, minimally intrusively:
 153          * we only set a single volatile integer word (not
 154          * using sigatomic_t - trying to avoid unnecessary
 155          * system dependencies and headers), and using
 156          * SA_RESTART.
 157          */
 158         memset(&sa, 0, sizeof(sa));
 159         sa.sa_handler = early_output;
 160         sigemptyset(&sa.sa_mask);
 161         sa.sa_flags = SA_RESTART;
 162         sigaction(SIGALRM, &sa, NULL);
 163
 164         /*
 165          * If we can get the whole output in less than a
 166          * tenth of a second, don't even bother doing the
 167          * early-output thing..
 168          *
 169          * This is a one-time-only trigger.
 170          */
 171         early_output_timer.it_value.tv_sec = 0;
 172         early_output_timer.it_value.tv_usec = 100000;
 173         setitimer(ITIMER_REAL, &early_output_timer, NULL);
 174 }
 175
 176 static void finish_early_output(struct rev_info *rev)
 177 {
 178         int n = estimate_commit_count(rev, rev->commits);
 179         signal(SIGALRM, SIG_IGN);
 180         show_early_header(rev, "done", n);
 181 }
 182
 183 static int cmd_log_walk(struct rev_info *rev)
 184 {
 185         struct commit *commit;
 186
 187         if (rev->early_output)
 188                 setup_early_output(rev);
 189
 190         if (prepare_revision_walk(rev))
 191                 die("revision walk setup failed");
 192
 193         if (rev->early_output)
 194                 finish_early_output(rev);
 195
 196         /*
 197          * For --check and --exit-code, the exit code is based on CHECK_FAILED
 198          * and HAS_CHANGES being accumulated in rev->diffopt, so be careful to
 199          * retain that state information if replacing rev->diffopt in this loop
 200          */
 201         while ((commit = get_revision(rev)) != NULL) {
 202                 log_tree_commit(rev, commit);
 203                 if (!rev->reflog_info) {
 204                         /* we allow cycles in reflog ancestry */
 205                         free(commit->buffer);
 206                         commit->buffer = NULL;
 207                 }
 208                 free_commit_list(commit->parents);
 209                 commit->parents = NULL;
 210         }
 211         if (rev->diffopt.output_format & DIFF_FORMAT_CHECKDIFF &&
 212             DIFF_OPT_TST(&rev->diffopt, CHECK_FAILED)) {
 213                 return 02;
 214         }
 215         return diff_result_code(&rev->diffopt, 0);
 216 }
 217
 218 static int git_log_config(const char *var, const char *value, void *cb)
 219 {
 220         if (!strcmp(var, "format.pretty"))
 221                 return git_config_string(&fmt_pretty, var, value);
 222         if (!strcmp(var, "format.subjectprefix"))
 223                 return git_config_string(&fmt_patch_subject_prefix, var, value);
 224         if (!strcmp(var, "log.date"))
 225                 return git_config_string(&default_date_mode, var, value);
 226         if (!strcmp(var, "log.showroot")) {
 227                 default_show_root = git_config_bool(var, value);
 228                 return 0;
 229         }
 230         return git_diff_ui_config(var, value, cb);
 231 }
 232
 233 int cmd_whatchanged(int argc, const char **argv, const char *prefix)
 234 {
 235         struct rev_info rev;
 236
 237         git_config(git_log_config, NULL);
 238
 239         if (diff_use_color_default == -1)
 240                 diff_use_color_default = git_use_color_default;
 241
 242         init_revisions(&rev, prefix);
 243         rev.diff = 1;
 244         rev.simplify_history = 0;
 245         cmd_log_init(argc, argv, prefix, &rev);
 246         if (!rev.diffopt.output_format)
 247                 rev.diffopt.output_format = DIFF_FORMAT_RAW;
 248         return cmd_log_walk(&rev);
 249 }
 250
 251 static void show_tagger(char *buf, int len, struct rev_info *rev)
 252 {
 253         struct strbuf out = STRBUF_INIT;
 254
 255         pp_user_info("Tagger", rev->commit_format, &out, buf, rev->date_mode,
 256                 git_log_output_encoding ?
 257                 git_log_output_encoding: git_commit_encoding);
 258         printf("%s\n", out.buf);
 259         strbuf_release(&out);
 260 }
 261
 262 static int show_object(const unsigned char *sha1, int show_tag_object,
 263         struct rev_info *rev)
 264 {
 265         unsigned long size;
 266         enum object_type type;
 267         char *buf = read_sha1_file(sha1, &type, &size);
 268         int offset = 0;
 269
 270         if (!buf)
 271                 return error("Could not read object %s", sha1_to_hex(sha1));
 272
 273         if (show_tag_object)
 274                 while (offset < size && buf[offset] != '\n') {
 275                         int new_offset = offset + 1;
 276                         while (new_offset < size && buf[new_offset++] != '\n')
 277                                 ; /* do nothing */
 278                         if (!prefixcmp(buf + offset, "tagger "))
 279                                 show_tagger(buf + offset + 7,
 280                                             new_offset - offset - 7, rev);
 281                         offset = new_offset;
 282                 }
 283
 284         if (offset < size)
 285                 fwrite(buf + offset, size - offset, 1, stdout);
 286         free(buf);
 287         return 0;
 288 }
 289
 290 static int show_tree_object(const unsigned char *sha1,
 291                 const char *base, int baselen,
 292                 const char *pathname, unsigned mode, int stage, void *context)
 293 {
 294         printf("%s%s\n", pathname, S_ISDIR(mode) ? "/" : "");
 295         return 0;
 296 }
 297
 298 int cmd_show(int argc, const char **argv, const char *prefix)
 299 {
 300         struct rev_info rev;
 301         struct object_array_entry *objects;
 302         int i, count, ret = 0;
 303
 304         git_config(git_log_config, NULL);
 305
 306         if (diff_use_color_default == -1)
 307                 diff_use_color_default = git_use_color_default;
 308
 309         init_revisions(&rev, prefix);
 310         rev.diff = 1;
 311         rev.combine_merges = 1;
 312         rev.dense_combined_merges = 1;
 313         rev.always_show_header = 1;
 314         rev.ignore_merges = 0;
 315         rev.no_walk = 1;
 316         cmd_log_init(argc, argv, prefix, &rev);
 317
 318         count = rev.pending.nr;
 319         objects = rev.pending.objects;
 320         for (i = 0; i < count && !ret; i++) {
 321                 struct object *o = objects[i].item;
 322                 const char *name = objects[i].name;
 323                 switch (o->type) {
 324                 case OBJ_BLOB:
 325                         ret = show_object(o->sha1, 0, NULL);
 326                         break;
 327                 case OBJ_TAG: {
 328                         struct tag *t = (struct tag *)o;
 329
 330                         printf("%stag %s%s\n",
 331                                         diff_get_color_opt(&rev.diffopt, DIFF_COMMIT),
 332                                         t->tag,
 333                                         diff_get_color_opt(&rev.diffopt, DIFF_RESET));
 334                         ret = show_object(o->sha1, 1, &rev);
 335                         if (ret)
 336                                 break;
 337                         o = parse_object(t->tagged->sha1);
 338                         if (!o)
 339                                 ret = error("Could not read object %s",
 340                                             sha1_to_hex(t->tagged->sha1));
 341                         objects[i].item = o;
 342                         i--;
 343                         break;
 344                 }
 345                 case OBJ_TREE:
 346                         printf("%stree %s%s\n\n",
 347                                         diff_get_color_opt(&rev.diffopt, DIFF_COMMIT),
 348                                         name,
 349                                         diff_get_color_opt(&rev.diffopt, DIFF_RESET));
 350                         read_tree_recursive((struct tree *)o, "", 0, 0, NULL,
 351                                         show_tree_object, NULL);
 352                         break;
 353                 case OBJ_COMMIT:
 354                         rev.pending.nr = rev.pending.alloc = 0;
 355                         rev.pending.objects = NULL;
 356                         add_object_array(o, name, &rev.pending);
 357                         ret = cmd_log_walk(&rev);
 358                         break;
 359                 default:
 360                         ret = error("Unknown type: %d", o->type);
 361                 }
 362         }
 363         free(objects);
 364         return ret;
 365 }
 366
 367 /*
 368  * This is equivalent to "git log -g --abbrev-commit --pretty=oneline"
 369  */
 370 int cmd_log_reflog(int argc, const char **argv, const char *prefix)
 371 {
 372         struct rev_info rev;
 373
 374         git_config(git_log_config, NULL);
 375
 376         if (diff_use_color_default == -1)
 377                 diff_use_color_default = git_use_color_default;
 378
 379         init_revisions(&rev, prefix);
 380         init_reflog_walk(&rev.reflog_info);
 381         rev.abbrev_commit = 1;
 382         rev.verbose_header = 1;
 383         cmd_log_init(argc, argv, prefix, &rev);
 384
 385         /*
 386          * This means that we override whatever commit format the user gave
 387          * on the cmd line.  Sad, but cmd_log_init() currently doesn't
 388          * allow us to set a different default.
 389          */
 390         rev.commit_format = CMIT_FMT_ONELINE;
 391         rev.use_terminator = 1;
 392         rev.always_show_header = 1;
 393
 394         /*
 395          * We get called through "git reflog", so unlike the other log
 396          * routines, we need to set up our pager manually..
 397          */
 398         setup_pager();
 399
 400         return cmd_log_walk(&rev);
 401 }
 402
 403 int cmd_log(int argc, const char **argv, const char *prefix)
 404 {
 405         struct rev_info rev;
 406
 407         git_config(git_log_config, NULL);
 408
 409         if (diff_use_color_default == -1)
 410                 diff_use_color_default = git_use_color_default;
 411
 412         init_revisions(&rev, prefix);
 413         rev.always_show_header = 1;
 414         cmd_log_init(argc, argv, prefix, &rev);
 415         return cmd_log_walk(&rev);
 416 }
 417
 418 /* format-patch */
 419 #define FORMAT_PATCH_NAME_MAX 64
 420
 421 static int istitlechar(char c)
 422 {
 423         return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') ||
 424                 (c >= '0' && c <= '9') || c == '.' || c == '_';
 425 }
 426
 427 static const char *fmt_patch_suffix = ".patch";
 428 static int numbered = 0;
 429 static int auto_number = 1;
 430
 431 static char *default_attach = NULL;
 432
 433 static char **extra_hdr;
 434 static int extra_hdr_nr;
 435 static int extra_hdr_alloc;
 436
 437 static char **extra_to;
 438 static int extra_to_nr;
 439 static int extra_to_alloc;
 440
 441 static char **extra_cc;
 442 static int extra_cc_nr;
 443 static int extra_cc_alloc;
 444
 445 static void add_header(const char *value)
 446 {
 447         int len = strlen(value);
 448         while (len && value[len - 1] == '\n')
 449                 len--;
 450         if (!strncasecmp(value, "to: ", 4)) {
 451                 ALLOC_GROW(extra_to, extra_to_nr + 1, extra_to_alloc);
 452                 extra_to[extra_to_nr++] = xstrndup(value + 4, len - 4);
 453                 return;
 454         }
 455         if (!strncasecmp(value, "cc: ", 4)) {
 456                 ALLOC_GROW(extra_cc, extra_cc_nr + 1, extra_cc_alloc);
 457                 extra_cc[extra_cc_nr++] = xstrndup(value + 4, len - 4);
 458                 return;
 459         }
 460         ALLOC_GROW(extra_hdr, extra_hdr_nr + 1, extra_hdr_alloc);
 461         extra_hdr[extra_hdr_nr++] = xstrndup(value, len);
 462 }
 463
 464 static int git_format_config(const char *var, const char *value, void *cb)
 465 {
 466         if (!strcmp(var, "format.headers")) {
 467                 if (!value)
 468                         die("format.headers without value");
 469                 add_header(value);
 470                 return 0;
 471         }
 472         if (!strcmp(var, "format.suffix"))
 473                 return git_config_string(&fmt_patch_suffix, var, value);
 474         if (!strcmp(var, "format.cc")) {
 475                 if (!value)
 476                         return config_error_nonbool(var);
 477                 ALLOC_GROW(extra_cc, extra_cc_nr + 1, extra_cc_alloc);
 478                 extra_cc[extra_cc_nr++] = xstrdup(value);
 479                 return 0;
 480         }
 481         if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
 482                 return 0;
 483         }
 484         if (!strcmp(var, "format.numbered")) {
 485                 if (value && !strcasecmp(value, "auto")) {
 486                         auto_number = 1;
 487                         return 0;
 488                 }
 489                 numbered = git_config_bool(var, value);
 490                 auto_number = auto_number && numbered;
 491                 return 0;
 492         }
 493         if (!strcmp(var, "format.attach")) {
 494                 if (value && *value)
 495                         default_attach = xstrdup(value);
 496                 else
 497                         default_attach = xstrdup(git_version_string);
 498                 return 0;
 499         }
 500
 501
 502         return git_log_config(var, value, cb);
 503 }
 504
 505
 506 static const char *get_oneline_for_filename(struct commit *commit,
 507                                             int keep_subject)
 508 {
 509         static char filename[PATH_MAX];
 510         char *sol;
 511         int len = 0;
 512         int suffix_len = strlen(fmt_patch_suffix) + 1;
 513
 514         sol = strstr(commit->buffer, "\n\n");
 515         if (!sol)
 516                 filename[0] = '\0';
 517         else {
 518                 int j, space = 0;
 519
 520                 sol += 2;
 521                 /* strip [PATCH] or [PATCH blabla] */
 522                 if (!keep_subject && !prefixcmp(sol, "[PATCH")) {
 523                         char *eos = strchr(sol + 6, ']');
 524                         if (eos) {
 525                                 while (isspace(*eos))
 526                                         eos++;
 527                                 sol = eos;
 528                         }
 529                 }
 530
 531                 for (j = 0;
 532                      j < FORMAT_PATCH_NAME_MAX - suffix_len - 5 &&
 533                              len < sizeof(filename) - suffix_len &&
 534                              sol[j] && sol[j] != '\n';
 535                      j++) {
 536                         if (istitlechar(sol[j])) {
 537                                 if (space) {
 538                                         filename[len++] = '-';
 539                                         space = 0;
 540                                 }
 541                                 filename[len++] = sol[j];
 542                                 if (sol[j] == '.')
 543                                         while (sol[j + 1] == '.')
 544                                                 j++;
 545                         } else
 546                                 space = 1;
 547                 }
 548                 while (filename[len - 1] == '.'
 549                        || filename[len - 1] == '-')
 550                         len--;
 551                 filename[len] = '\0';
 552         }
 553         return filename;
 554 }
 555
 556 static FILE *realstdout = NULL;
 557 static const char *output_directory = NULL;
 558 static int outdir_offset;
 559
 560 static int reopen_stdout(const char *oneline, int nr, int total)
 561 {
 562         char filename[PATH_MAX];
 563         int len = 0;
 564         int suffix_len = strlen(fmt_patch_suffix) + 1;
 565
 566         if (output_directory) {
 567                 len = snprintf(filename, sizeof(filename), "%s",
 568                                 output_directory);
 569                 if (len >=
 570                     sizeof(filename) - FORMAT_PATCH_NAME_MAX - suffix_len)
 571                         return error("name of output directory is too long");
 572                 if (filename[len - 1] != '/')
 573                         filename[len++] = '/';
 574         }
 575
 576         if (!oneline)
 577                 len += sprintf(filename + len, "%d", nr);
 578         else {
 579                 len += sprintf(filename + len, "%04d-", nr);
 580                 len += snprintf(filename + len, sizeof(filename) - len - 1
 581                                 - suffix_len, "%s", oneline);
 582                 strcpy(filename + len, fmt_patch_suffix);
 583         }
 584
 585         fprintf(realstdout, "%s\n", filename + outdir_offset);
 586         if (freopen(filename, "w", stdout) == NULL)
 587                 return error("Cannot open patch file %s",filename);
 588
 589         return 0;
 590 }
 591
 592 static void get_patch_ids(struct rev_info *rev, struct patch_ids *ids, const char *prefix)
 593 {
 594         struct rev_info check_rev;
 595         struct commit *commit;
 596         struct object *o1, *o2;
 597         unsigned flags1, flags2;
 598
 599         if (rev->pending.nr != 2)
 600                 die("Need exactly one range.");
 601
 602         o1 = rev->pending.objects[0].item;
 603         flags1 = o1->flags;
 604         o2 = rev->pending.objects[1].item;
 605         flags2 = o2->flags;
 606
 607         if ((flags1 & UNINTERESTING) == (flags2 & UNINTERESTING))
 608                 die("Not a range.");
 609
 610         init_patch_ids(ids);
 611
 612         /* given a range a..b get all patch ids for b..a */
 613         init_revisions(&check_rev, prefix);
 614         o1->flags ^= UNINTERESTING;
 615         o2->flags ^= UNINTERESTING;
 616         add_pending_object(&check_rev, o1, "o1");
 617         add_pending_object(&check_rev, o2, "o2");
 618         if (prepare_revision_walk(&check_rev))
 619                 die("revision walk setup failed");
 620
 621         while ((commit = get_revision(&check_rev)) != NULL) {
 622                 /* ignore merges */
 623                 if (commit->parents && commit->parents->next)
 624                         continue;
 625
 626                 add_commit_patch_id(commit, ids);
 627         }
 628
 629         /* reset for next revision walk */
 630         clear_commit_marks((struct commit *)o1,
 631                         SEEN | UNINTERESTING | SHOWN | ADDED);
 632         clear_commit_marks((struct commit *)o2,
 633                         SEEN | UNINTERESTING | SHOWN | ADDED);
 634         o1->flags = flags1;
 635         o2->flags = flags2;
 636 }
 637
 638 static void gen_message_id(struct rev_info *info, char *base)
 639 {
 640         const char *committer = git_committer_info(IDENT_WARN_ON_NO_NAME);
 641         const char *email_start = strrchr(committer, '<');
 642         const char *email_end = strrchr(committer, '>');
 643         struct strbuf buf = STRBUF_INIT;
 644         if (!email_start || !email_end || email_start > email_end - 1)
 645                 die("Could not extract email from committer identity.");
 646         strbuf_addf(&buf, "%s.%lu.git.%.*s", base,
 647                     (unsigned long) time(NULL),
 648                     (int)(email_end - email_start - 1), email_start + 1);
 649         info->message_id = strbuf_detach(&buf, NULL);
 650 }
 651
 652 static void make_cover_letter(struct rev_info *rev, int use_stdout,
 653                               int numbered, int numbered_files,
 654                               struct commit *origin,
 655                               int nr, struct commit **list, struct commit *head)
 656 {
 657         const char *committer;
 658         char *head_sha1;
 659         const char *subject_start = NULL;
 660         const char *body = "*** SUBJECT HERE ***\n\n*** BLURB HERE ***\n";
 661         const char *msg;
 662         const char *extra_headers = rev->extra_headers;
 663         struct shortlog log;
 664         struct strbuf sb = STRBUF_INIT;
 665         int i;
 666         const char *encoding = "utf-8";
 667         struct diff_options opts;
 668         int need_8bit_cte = 0;
 669
 670         if (rev->commit_format != CMIT_FMT_EMAIL)
 671                 die("Cover letter needs email format");
 672
 673         if (!use_stdout && reopen_stdout(numbered_files ?
 674                                 NULL : "cover-letter", 0, rev->total))
 675                 return;
 676
 677         head_sha1 = sha1_to_hex(head->object.sha1);
 678
 679         log_write_email_headers(rev, head_sha1, &subject_start, &extra_headers,
 680                                 &need_8bit_cte);
 681
 682         committer = git_committer_info(0);
 683
 684         msg = body;
 685         pp_user_info(NULL, CMIT_FMT_EMAIL, &sb, committer, DATE_RFC2822,
 686                      encoding);
 687         pp_title_line(CMIT_FMT_EMAIL, &msg, &sb, subject_start, extra_headers,
 688                       encoding, need_8bit_cte);
 689         pp_remainder(CMIT_FMT_EMAIL, &msg, &sb, 0);
 690         printf("%s\n", sb.buf);
 691
 692         strbuf_release(&sb);
 693
 694         shortlog_init(&log);
 695         log.wrap_lines = 1;
 696         log.wrap = 72;
 697         log.in1 = 2;
 698         log.in2 = 4;
 699         for (i = 0; i < nr; i++)
 700                 shortlog_add_commit(&log, list[i]);
 701
 702         shortlog_output(&log);
 703
 704         /*
 705          * We can only do diffstat with a unique reference point
 706          */
 707         if (!origin)
 708                 return;
 709
 710         memcpy(&opts, &rev->diffopt, sizeof(opts));
 711         opts.output_format = DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT;
 712
 713         diff_setup_done(&opts);
 714
 715         diff_tree_sha1(origin->tree->object.sha1,
 716                        head->tree->object.sha1,
 717                        "", &opts);
 718         diffcore_std(&opts);
 719         diff_flush(&opts);
 720
 721         printf("\n");
 722 }
 723
 724 static const char *clean_message_id(const char *msg_id)
 725 {
 726         char ch;
 727         const char *a, *z, *m;
 728
 729         m = msg_id;
 730         while ((ch = *m) && (isspace(ch) || (ch == '<')))
 731                 m++;
 732         a = m;
 733         z = NULL;
 734         while ((ch = *m)) {
 735                 if (!isspace(ch) && (ch != '>'))
 736                         z = m;
 737                 m++;
 738         }
 739         if (!z)
 740                 die("insane in-reply-to: %s", msg_id);
 741         if (++z == m)
 742                 return a;
 743         return xmemdupz(a, z - a);
 744 }
 745
 746 static const char *set_outdir(const char *prefix, const char *output_directory)
 747 {
 748         if (output_directory && is_absolute_path(output_directory))
 749                 return output_directory;
 750
 751         if (!prefix || !*prefix) {
 752                 if (output_directory)
 753                         return output_directory;
 754                 /* The user did not explicitly ask for "./" */
 755                 outdir_offset = 2;
 756                 return "./";
 757         }
 758
 759         outdir_offset = strlen(prefix);
 760         if (!output_directory)
 761                 return prefix;
 762
 763         return xstrdup(prefix_filename(prefix, outdir_offset,
 764                                        output_directory));
 765 }
 766
 767 int cmd_format_patch(int argc, const char **argv, const char *prefix)
 768 {
 769         struct commit *commit;
 770         struct commit **list = NULL;
 771         struct rev_info rev;
 772         int nr = 0, total, i, j;
 773         int use_stdout = 0;
 774         int start_number = -1;
 775         int keep_subject = 0;
 776         int numbered_files = 0;         /* _just_ numbers */
 777         int subject_prefix = 0;
 778         int ignore_if_in_upstream = 0;
 779         int thread = 0;
 780         int cover_letter = 0;
 781         int boundary_count = 0;
 782         int no_binary_diff = 0;
 783         struct commit *origin = NULL, *head = NULL;
 784         const char *in_reply_to = NULL;
 785         struct patch_ids ids;
 786         char *add_signoff = NULL;
 787         struct strbuf buf = STRBUF_INIT;
 788
 789         git_config(git_format_config, NULL);
 790         init_revisions(&rev, prefix);
 791         rev.commit_format = CMIT_FMT_EMAIL;
 792         rev.verbose_header = 1;
 793         rev.diff = 1;
 794         rev.combine_merges = 0;
 795         rev.ignore_merges = 1;
 796         DIFF_OPT_SET(&rev.diffopt, RECURSIVE);
 797
 798         rev.subject_prefix = fmt_patch_subject_prefix;
 799
 800         if (default_attach) {
 801                 rev.mime_boundary = default_attach;
 802                 rev.no_inline = 1;
 803         }
 804
 805         /*
 806          * Parse the arguments before setup_revisions(), or something
 807          * like "git format-patch -o a123 HEAD^.." may fail; a123 is
 808          * possibly a valid SHA1.
 809          */
 810         for (i = 1, j = 1; i < argc; i++) {
 811                 if (!strcmp(argv[i], "--stdout"))
 812                         use_stdout = 1;
 813                 else if (!strcmp(argv[i], "-n") ||
 814                                 !strcmp(argv[i], "--numbered"))
 815                         numbered = 1;
 816                 else if (!strcmp(argv[i], "-N") ||
 817                                 !strcmp(argv[i], "--no-numbered")) {
 818                         numbered = 0;
 819                         auto_number = 0;
 820                 }
 821                 else if (!prefixcmp(argv[i], "--start-number="))
 822                         start_number = strtol(argv[i] + 15, NULL, 10);
 823                 else if (!strcmp(argv[i], "--numbered-files"))
 824                         numbered_files = 1;
 825                 else if (!strcmp(argv[i], "--start-number")) {
 826                         i++;
 827                         if (i == argc)
 828                                 die("Need a number for --start-number");
 829                         start_number = strtol(argv[i], NULL, 10);
 830                 }
 831                 else if (!prefixcmp(argv[i], "--cc=")) {
 832                         ALLOC_GROW(extra_cc, extra_cc_nr + 1, extra_cc_alloc);
 833                         extra_cc[extra_cc_nr++] = xstrdup(argv[i] + 5);
 834                 }
 835                 else if (!strcmp(argv[i], "-k") ||
 836                                 !strcmp(argv[i], "--keep-subject")) {
 837                         keep_subject = 1;
 838                         rev.total = -1;
 839                 }
 840                 else if (!strcmp(argv[i], "--output-directory") ||
 841                          !strcmp(argv[i], "-o")) {
 842                         i++;
 843                         if (argc <= i)
 844                                 die("Which directory?");
 845                         if (output_directory)
 846                                 die("Two output directories?");
 847                         output_directory = argv[i];
 848                 }
 849                 else if (!strcmp(argv[i], "--signoff") ||
 850                          !strcmp(argv[i], "-s")) {
 851                         const char *committer;
 852                         const char *endpos;
 853                         committer = git_committer_info(IDENT_ERROR_ON_NO_NAME);
 854                         endpos = strchr(committer, '>');
 855                         if (!endpos)
 856                                 die("bogus committer info %s", committer);
 857                         add_signoff = xmemdupz(committer, endpos - committer + 1);
 858                 }
 859                 else if (!strcmp(argv[i], "--attach")) {
 860                         rev.mime_boundary = git_version_string;
 861                         rev.no_inline = 1;
 862                 }
 863                 else if (!prefixcmp(argv[i], "--attach=")) {
 864                         rev.mime_boundary = argv[i] + 9;
 865                         rev.no_inline = 1;
 866                 }
 867                 else if (!strcmp(argv[i], "--no-attach")) {
 868                         rev.mime_boundary = NULL;
 869                         rev.no_inline = 0;
 870                 }
 871                 else if (!strcmp(argv[i], "--inline")) {
 872                         rev.mime_boundary = git_version_string;
 873                         rev.no_inline = 0;
 874                 }
 875                 else if (!prefixcmp(argv[i], "--inline=")) {
 876                         rev.mime_boundary = argv[i] + 9;
 877                         rev.no_inline = 0;
 878                 }
 879                 else if (!strcmp(argv[i], "--ignore-if-in-upstream"))
 880                         ignore_if_in_upstream = 1;
 881                 else if (!strcmp(argv[i], "--thread"))
 882                         thread = 1;
 883                 else if (!prefixcmp(argv[i], "--in-reply-to="))
 884                         in_reply_to = argv[i] + 14;
 885                 else if (!strcmp(argv[i], "--in-reply-to")) {
 886                         i++;
 887                         if (i == argc)
 888                                 die("Need a Message-Id for --in-reply-to");
 889                         in_reply_to = argv[i];
 890                 } else if (!prefixcmp(argv[i], "--subject-prefix=")) {
 891                         subject_prefix = 1;
 892                         rev.subject_prefix = argv[i] + 17;
 893                 } else if (!prefixcmp(argv[i], "--suffix="))
 894                         fmt_patch_suffix = argv[i] + 9;
 895                 else if (!strcmp(argv[i], "--cover-letter"))
 896                         cover_letter = 1;
 897                 else if (!strcmp(argv[i], "--no-binary"))
 898                         no_binary_diff = 1;
 899                 else
 900                         argv[j++] = argv[i];
 901         }
 902         argc = j;
 903
 904         for (i = 0; i < extra_hdr_nr; i++) {
 905                 strbuf_addstr(&buf, extra_hdr[i]);
 906                 strbuf_addch(&buf, '\n');
 907         }
 908
 909         if (extra_to_nr)
 910                 strbuf_addstr(&buf, "To: ");
 911         for (i = 0; i < extra_to_nr; i++) {
 912                 if (i)
 913                         strbuf_addstr(&buf, "    ");
 914                 strbuf_addstr(&buf, extra_to[i]);
 915                 if (i + 1 < extra_to_nr)
 916                         strbuf_addch(&buf, ',');
 917                 strbuf_addch(&buf, '\n');
 918         }
 919
 920         if (extra_cc_nr)
 921                 strbuf_addstr(&buf, "Cc: ");
 922         for (i = 0; i < extra_cc_nr; i++) {
 923                 if (i)
 924                         strbuf_addstr(&buf, "    ");
 925                 strbuf_addstr(&buf, extra_cc[i]);
 926                 if (i + 1 < extra_cc_nr)
 927                         strbuf_addch(&buf, ',');
 928                 strbuf_addch(&buf, '\n');
 929         }
 930
 931         rev.extra_headers = strbuf_detach(&buf, 0);
 932
 933         if (start_number < 0)
 934                 start_number = 1;
 935         if (numbered && keep_subject)
 936                 die ("-n and -k are mutually exclusive.");
 937         if (keep_subject && subject_prefix)
 938                 die ("--subject-prefix and -k are mutually exclusive.");
 939         if (numbered_files && use_stdout)
 940                 die ("--numbered-files and --stdout are mutually exclusive.");
 941
 942         argc = setup_revisions(argc, argv, &rev, "HEAD");
 943         if (argc > 1)
 944                 die ("unrecognized argument: %s", argv[1]);
 945
 946         if (!rev.diffopt.output_format
 947                 || rev.diffopt.output_format == DIFF_FORMAT_PATCH)
 948                 rev.diffopt.output_format = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_SUMMARY | DIFF_FORMAT_PATCH;
 949
 950         if (!DIFF_OPT_TST(&rev.diffopt, TEXT) && !no_binary_diff)
 951                 DIFF_OPT_SET(&rev.diffopt, BINARY);
 952
 953         if (!use_stdout)
 954                 output_directory = set_outdir(prefix, output_directory);
 955
 956         if (output_directory) {
 957                 if (use_stdout)
 958                         die("standard output, or directory, which one?");
 959                 if (mkdir(output_directory, 0777) < 0 && errno != EEXIST)
 960                         die("Could not create directory %s",
 961                             output_directory);
 962         }
 963
 964         if (rev.pending.nr == 1) {
 965                 if (rev.max_count < 0 && !rev.show_root_diff) {
 966                         /*
 967                          * This is traditional behaviour of "git format-patch
 968                          * origin" that prepares what the origin side still
 969                          * does not have.
 970                          */
 971                         rev.pending.objects[0].item->flags |= UNINTERESTING;
 972                         add_head_to_pending(&rev);
 973                 }
 974                 /*
 975                  * Otherwise, it is "format-patch -22 HEAD", and/or
 976                  * "format-patch --root HEAD".  The user wants
 977                  * get_revision() to do the usual traversal.
 978                  */
 979         }
 980
 981         /*
 982          * We cannot move this anywhere earlier because we do want to
 983          * know if --root was given explicitly from the comand line.
 984          */
 985         rev.show_root_diff = 1;
 986
 987         if (cover_letter) {
 988                 /* remember the range */
 989                 int i;
 990                 for (i = 0; i < rev.pending.nr; i++) {
 991                         struct object *o = rev.pending.objects[i].item;
 992                         if (!(o->flags & UNINTERESTING))
 993                                 head = (struct commit *)o;
 994                 }
 995                 /* We can't generate a cover letter without any patches */
 996                 if (!head)
 997                         return 0;
 998         }
 999
1000         if (ignore_if_in_upstream)
1001                 get_patch_ids(&rev, &ids, prefix);
1002
1003         if (!use_stdout)
1004                 realstdout = xfdopen(xdup(1), "w");
1005
1006         if (prepare_revision_walk(&rev))
1007                 die("revision walk setup failed");
1008         rev.boundary = 1;
1009         while ((commit = get_revision(&rev)) != NULL) {
1010                 if (commit->object.flags & BOUNDARY) {
1011                         boundary_count++;
1012                         origin = (boundary_count == 1) ? commit : NULL;
1013                         continue;
1014                 }
1015
1016                 /* ignore merges */
1017                 if (commit->parents && commit->parents->next)
1018                         continue;
1019
1020                 if (ignore_if_in_upstream &&
1021                                 has_commit_patch_id(commit, &ids))
1022                         continue;
1023
1024                 nr++;
1025                 list = xrealloc(list, nr * sizeof(list[0]));
1026                 list[nr - 1] = commit;
1027         }
1028         total = nr;
1029         if (!keep_subject && auto_number && total > 1)
1030                 numbered = 1;
1031         if (numbered)
1032                 rev.total = total + start_number - 1;
1033         if (in_reply_to)
1034                 rev.ref_message_id = clean_message_id(in_reply_to);
1035         if (cover_letter) {
1036                 if (thread)
1037                         gen_message_id(&rev, "cover");
1038                 make_cover_letter(&rev, use_stdout, numbered, numbered_files,
1039                                   origin, nr, list, head);
1040                 total++;
1041                 start_number--;
1042         }
1043         rev.add_signoff = add_signoff;
1044         while (0 <= --nr) {
1045                 int shown;
1046                 commit = list[nr];
1047                 rev.nr = total - nr + (start_number - 1);
1048                 /* Make the second and subsequent mails replies to the first */
1049                 if (thread) {
1050                         /* Have we already had a message ID? */
1051                         if (rev.message_id) {
1052                                 /*
1053                                  * If we've got the ID to be a reply
1054                                  * to, discard the current ID;
1055                                  * otherwise, make everything a reply
1056                                  * to that.
1057                                  */
1058                                 if (rev.ref_message_id)
1059                                         free(rev.message_id);
1060                                 else
1061                                         rev.ref_message_id = rev.message_id;
1062                         }
1063                         gen_message_id(&rev, sha1_to_hex(commit->object.sha1));
1064                 }
1065                 if (!use_stdout && reopen_stdout(numbered_files ? NULL :
1066                                 get_oneline_for_filename(commit, keep_subject),
1067                                 rev.nr, rev.total))
1068                         die("Failed to create output files");
1069                 shown = log_tree_commit(&rev, commit);
1070                 free(commit->buffer);
1071                 commit->buffer = NULL;
1072
1073                 /* We put one extra blank line between formatted
1074                  * patches and this flag is used by log-tree code
1075                  * to see if it needs to emit a LF before showing
1076                  * the log; when using one file per patch, we do
1077                  * not want the extra blank line.
1078                  */
1079                 if (!use_stdout)
1080                         rev.shown_one = 0;
1081                 if (shown) {
1082                         if (rev.mime_boundary)
1083                                 printf("\n--%s%s--\n\n\n",
1084                                        mime_boundary_leader,
1085                                        rev.mime_boundary);
1086                         else
1087                                 printf("-- \n%s\n\n", git_version_string);
1088                 }
1089                 if (!use_stdout)
1090                         fclose(stdout);
1091         }
1092         free(list);
1093         if (ignore_if_in_upstream)
1094                 free_patch_ids(&ids);
1095         return 0;
1096 }
1097
1098 static int add_pending_commit(const char *arg, struct rev_info *revs, int flags)
1099 {
1100         unsigned char sha1[20];
1101         if (get_sha1(arg, sha1) == 0) {
1102                 struct commit *commit = lookup_commit_reference(sha1);
1103                 if (commit) {
1104                         commit->object.flags |= flags;
1105                         add_pending_object(revs, &commit->object, arg);
1106                         return 0;
1107                 }
1108         }
1109         return -1;
1110 }
1111
1112 static const char cherry_usage[] =
1113 "git cherry [-v] [<upstream> [<head> [<limit>]]]";
1114 int cmd_cherry(int argc, const char **argv, const char *prefix)
1115 {
1116         struct rev_info revs;
1117         struct patch_ids ids;
1118         struct commit *commit;
1119         struct commit_list *list = NULL;
1120         struct branch *current_branch;
1121         const char *upstream;
1122         const char *head = "HEAD";
1123         const char *limit = NULL;
1124         int verbose = 0;
1125
1126         if (argc > 1 && !strcmp(argv[1], "-v")) {
1127                 verbose = 1;
1128                 argc--;
1129                 argv++;
1130         }
1131
1132         switch (argc) {
1133         case 4:
1134                 limit = argv[3];
1135                 /* FALLTHROUGH */
1136         case 3:
1137                 head = argv[2];
1138                 /* FALLTHROUGH */
1139         case 2:
1140                 upstream = argv[1];
1141                 break;
1142         default:
1143                 current_branch = branch_get(NULL);
1144                 if (!current_branch || !current_branch->merge
1145                                         || !current_branch->merge[0]
1146                                         || !current_branch->merge[0]->dst) {
1147                         fprintf(stderr, "Could not find a tracked"
1148                                         " remote branch, please"
1149                                         " specify <upstream> manually.\n");
1150                         usage(cherry_usage);
1151                 }
1152
1153                 upstream = current_branch->merge[0]->dst;
1154         }
1155
1156         init_revisions(&revs, prefix);
1157         revs.diff = 1;
1158         revs.combine_merges = 0;
1159         revs.ignore_merges = 1;
1160         DIFF_OPT_SET(&revs.diffopt, RECURSIVE);
1161
1162         if (add_pending_commit(head, &revs, 0))
1163                 die("Unknown commit %s", head);
1164         if (add_pending_commit(upstream, &revs, UNINTERESTING))
1165                 die("Unknown commit %s", upstream);
1166
1167         /* Don't say anything if head and upstream are the same. */
1168         if (revs.pending.nr == 2) {
1169                 struct object_array_entry *o = revs.pending.objects;
1170                 if (hashcmp(o[0].item->sha1, o[1].item->sha1) == 0)
1171                         return 0;
1172         }
1173
1174         get_patch_ids(&revs, &ids, prefix);
1175
1176         if (limit && add_pending_commit(limit, &revs, UNINTERESTING))
1177                 die("Unknown commit %s", limit);
1178
1179         /* reverse the list of commits */
1180         if (prepare_revision_walk(&revs))
1181                 die("revision walk setup failed");
1182         while ((commit = get_revision(&revs)) != NULL) {
1183                 /* ignore merges */
1184                 if (commit->parents && commit->parents->next)
1185                         continue;
1186
1187                 commit_list_insert(commit, &list);
1188         }
1189
1190         while (list) {
1191                 char sign = '+';
1192
1193                 commit = list->item;
1194                 if (has_commit_patch_id(commit, &ids))
1195                         sign = '-';
1196
1197                 if (verbose) {
1198                         struct strbuf buf = STRBUF_INIT;
1199                         pretty_print_commit(CMIT_FMT_ONELINE, commit,
1200                                             &buf, 0, NULL, NULL, 0, 0);
1201                         printf("%c %s %s\n", sign,
1202                                sha1_to_hex(commit->object.sha1), buf.buf);
1203                         strbuf_release(&buf);
1204                 }
1205                 else {
1206                         printf("%c %s\n", sign,
1207                                sha1_to_hex(commit->object.sha1));
1208                 }
1209
1210                 list = list->next;
1211         }
1212
1213         free_patch_ids(&ids);
1214         return 0;
1215 }