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