git.oblomov.eu Git - git/blob - 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 #include "string-list.h"
  21
  22 /* Set a default date-time format for git log ("log.date" config variable) */
  23 static const char *default_date_mode = NULL;
  24
  25 static int default_show_root = 1;
  26 static const char *fmt_patch_subject_prefix = "PATCH";
  27 static const char *fmt_pretty;
  28
  29 static void cmd_log_init(int argc, const char **argv, const char *prefix,
  30                       struct rev_info *rev)
  31 {
  32         int i;
  33
  34         rev->abbrev = DEFAULT_ABBREV;
  35         rev->commit_format = CMIT_FMT_DEFAULT;
  36         if (fmt_pretty)
  37                 get_commit_format(fmt_pretty, rev);
  38         rev->verbose_header = 1;
  39         DIFF_OPT_SET(&rev->diffopt, RECURSIVE);
  40         rev->show_root_diff = default_show_root;
  41         rev->subject_prefix = fmt_patch_subject_prefix;
  42         DIFF_OPT_SET(&rev->diffopt, ALLOW_TEXTCONV);
  43
  44         if (default_date_mode)
  45                 rev->date_mode = parse_date_format(default_date_mode);
  46
  47         argc = setup_revisions(argc, argv, rev, "HEAD");
  48
  49         if (rev->diffopt.pickaxe || rev->diffopt.filter)
  50                 rev->always_show_header = 0;
  51         if (DIFF_OPT_TST(&rev->diffopt, FOLLOW_RENAMES)) {
  52                 rev->always_show_header = 0;
  53                 if (rev->diffopt.nr_paths != 1)
  54                         usage("git logs can only follow renames on one pathname at a time");
  55         }
  56         for (i = 1; i < argc; i++) {
  57                 const char *arg = argv[i];
  58                 if (!strcmp(arg, "--decorate")) {
  59                         load_ref_decorations();
  60                         rev->show_decorations = 1;
  61                 } else if (!strcmp(arg, "--source")) {
  62                         rev->show_source = 1;
  63                 } else
  64                         die("unrecognized argument: %s", arg);
  65         }
  66 }
  67
  68 /*
  69  * This gives a rough estimate for how many commits we
  70  * will print out in the list.
  71  */
  72 static int estimate_commit_count(struct rev_info *rev, struct commit_list *list)
  73 {
  74         int n = 0;
  75
  76         while (list) {
  77                 struct commit *commit = list->item;
  78                 unsigned int flags = commit->object.flags;
  79                 list = list->next;
  80                 if (!(flags & (TREESAME | UNINTERESTING)))
  81                         n++;
  82         }
  83         return n;
  84 }
  85
  86 static void show_early_header(struct rev_info *rev, const char *stage, int nr)
  87 {
  88         if (rev->shown_one) {
  89                 rev->shown_one = 0;
  90                 if (rev->commit_format != CMIT_FMT_ONELINE)
  91                         putchar(rev->diffopt.line_termination);
  92         }
  93         printf("Final output: %d %s\n", nr, stage);
  94 }
  95
  96 struct itimerval early_output_timer;
  97
  98 static void log_show_early(struct rev_info *revs, struct commit_list *list)
  99 {
 100         int i = revs->early_output;
 101         int show_header = 1;
 102
 103         sort_in_topological_order(&list, revs->lifo);
 104         while (list && i) {
 105                 struct commit *commit = list->item;
 106                 switch (simplify_commit(revs, commit)) {
 107                 case commit_show:
 108                         if (show_header) {
 109                                 int n = estimate_commit_count(revs, list);
 110                                 show_early_header(revs, "incomplete", n);
 111                                 show_header = 0;
 112                         }
 113                         log_tree_commit(revs, commit);
 114                         i--;
 115                         break;
 116                 case commit_ignore:
 117                         break;
 118                 case commit_error:
 119                         return;
 120                 }
 121                 list = list->next;
 122         }
 123
 124         /* Did we already get enough commits for the early output? */
 125         if (!i)
 126                 return;
 127
 128         /*
 129          * ..if no, then repeat it twice a second until we
 130          * do.
 131          *
 132          * NOTE! We don't use "it_interval", because if the
 133          * reader isn't listening, we want our output to be
 134          * throttled by the writing, and not have the timer
 135          * trigger every second even if we're blocked on a
 136          * reader!
 137          */
 138         early_output_timer.it_value.tv_sec = 0;
 139         early_output_timer.it_value.tv_usec = 500000;
 140         setitimer(ITIMER_REAL, &early_output_timer, NULL);
 141 }
 142
 143 static void early_output(int signal)
 144 {
 145         show_early_output = log_show_early;
 146 }
 147
 148 static void setup_early_output(struct rev_info *rev)
 149 {
 150         struct sigaction sa;
 151
 152         /*
 153          * Set up the signal handler, minimally intrusively:
 154          * we only set a single volatile integer word (not
 155          * using sigatomic_t - trying to avoid unnecessary
 156          * system dependencies and headers), and using
 157          * SA_RESTART.
 158          */
 159         memset(&sa, 0, sizeof(sa));
 160         sa.sa_handler = early_output;
 161         sigemptyset(&sa.sa_mask);
 162         sa.sa_flags = SA_RESTART;
 163         sigaction(SIGALRM, &sa, NULL);
 164
 165         /*
 166          * If we can get the whole output in less than a
 167          * tenth of a second, don't even bother doing the
 168          * early-output thing..
 169          *
 170          * This is a one-time-only trigger.
 171          */
 172         early_output_timer.it_value.tv_sec = 0;
 173         early_output_timer.it_value.tv_usec = 100000;
 174         setitimer(ITIMER_REAL, &early_output_timer, NULL);
 175 }
 176
 177 static void finish_early_output(struct rev_info *rev)
 178 {
 179         int n = estimate_commit_count(rev, rev->commits);
 180         signal(SIGALRM, SIG_IGN);
 181         show_early_header(rev, "done", n);
 182 }
 183
 184 static int cmd_log_walk(struct rev_info *rev)
 185 {
 186         struct commit *commit;
 187
 188         if (rev->early_output)
 189                 setup_early_output(rev);
 190
 191         if (prepare_revision_walk(rev))
 192                 die("revision walk setup failed");
 193
 194         if (rev->early_output)
 195                 finish_early_output(rev);
 196
 197         /*
 198          * For --check and --exit-code, the exit code is based on CHECK_FAILED
 199          * and HAS_CHANGES being accumulated in rev->diffopt, so be careful to
 200          * retain that state information if replacing rev->diffopt in this loop
 201          */
 202         while ((commit = get_revision(rev)) != NULL) {
 203                 log_tree_commit(rev, commit);
 204                 if (!rev->reflog_info) {
 205                         /* we allow cycles in reflog ancestry */
 206                         free(commit->buffer);
 207                         commit->buffer = NULL;
 208                 }
 209                 free_commit_list(commit->parents);
 210                 commit->parents = NULL;
 211         }
 212         if (rev->diffopt.output_format & DIFF_FORMAT_CHECKDIFF &&
 213             DIFF_OPT_TST(&rev->diffopt, CHECK_FAILED)) {
 214                 return 02;
 215         }
 216         return diff_result_code(&rev->diffopt, 0);
 217 }
 218
 219 static int git_log_config(const char *var, const char *value, void *cb)
 220 {
 221         if (!strcmp(var, "format.pretty"))
 222                 return git_config_string(&fmt_pretty, var, value);
 223         if (!strcmp(var, "format.subjectprefix"))
 224                 return git_config_string(&fmt_patch_subject_prefix, var, value);
 225         if (!strcmp(var, "log.date"))
 226                 return git_config_string(&default_date_mode, var, value);
 227         if (!strcmp(var, "log.showroot")) {
 228                 default_show_root = git_config_bool(var, value);
 229                 return 0;
 230         }
 231         return git_diff_ui_config(var, value, cb);
 232 }
 233
 234 int cmd_whatchanged(int argc, const char **argv, const char *prefix)
 235 {
 236         struct rev_info rev;
 237
 238         git_config(git_log_config, NULL);
 239
 240         if (diff_use_color_default == -1)
 241                 diff_use_color_default = git_use_color_default;
 242
 243         init_revisions(&rev, prefix);
 244         rev.diff = 1;
 245         rev.simplify_history = 0;
 246         cmd_log_init(argc, argv, prefix, &rev);
 247         if (!rev.diffopt.output_format)
 248                 rev.diffopt.output_format = DIFF_FORMAT_RAW;
 249         return cmd_log_walk(&rev);
 250 }
 251
 252 static void show_tagger(char *buf, int len, struct rev_info *rev)
 253 {
 254         struct strbuf out = STRBUF_INIT;
 255
 256         pp_user_info("Tagger", rev->commit_format, &out, buf, rev->date_mode,
 257                 git_log_output_encoding ?
 258                 git_log_output_encoding: git_commit_encoding);
 259         printf("%s\n", out.buf);
 260         strbuf_release(&out);
 261 }
 262
 263 static int show_object(const unsigned char *sha1, int show_tag_object,
 264         struct rev_info *rev)
 265 {
 266         unsigned long size;
 267         enum object_type type;
 268         char *buf = read_sha1_file(sha1, &type, &size);
 269         int offset = 0;
 270
 271         if (!buf)
 272                 return error("Could not read object %s", sha1_to_hex(sha1));
 273
 274         if (show_tag_object)
 275                 while (offset < size && buf[offset] != '\n') {
 276                         int new_offset = offset + 1;
 277                         while (new_offset < size && buf[new_offset++] != '\n')
 278                                 ; /* do nothing */
 279                         if (!prefixcmp(buf + offset, "tagger "))
 280                                 show_tagger(buf + offset + 7,
 281                                             new_offset - offset - 7, rev);
 282                         offset = new_offset;
 283                 }
 284
 285         if (offset < size)
 286                 fwrite(buf + offset, size - offset, 1, stdout);
 287         free(buf);
 288         return 0;
 289 }
 290
 291 static int show_tree_object(const unsigned char *sha1,
 292                 const char *base, int baselen,
 293                 const char *pathname, unsigned mode, int stage, void *context)
 294 {
 295         printf("%s%s\n", pathname, S_ISDIR(mode) ? "/" : "");
 296         return 0;
 297 }
 298
 299 int cmd_show(int argc, const char **argv, const char *prefix)
 300 {
 301         struct rev_info rev;
 302         struct object_array_entry *objects;
 303         int i, count, ret = 0;
 304
 305         git_config(git_log_config, NULL);
 306
 307         if (diff_use_color_default == -1)
 308                 diff_use_color_default = git_use_color_default;
 309
 310         init_revisions(&rev, prefix);
 311         rev.diff = 1;
 312         rev.combine_merges = 1;
 313         rev.dense_combined_merges = 1;
 314         rev.always_show_header = 1;
 315         rev.ignore_merges = 0;
 316         rev.no_walk = 1;
 317         cmd_log_init(argc, argv, prefix, &rev);
 318
 319         count = rev.pending.nr;
 320         objects = rev.pending.objects;
 321         for (i = 0; i < count && !ret; i++) {
 322                 struct object *o = objects[i].item;
 323                 const char *name = objects[i].name;
 324                 switch (o->type) {
 325                 case OBJ_BLOB:
 326                         ret = show_object(o->sha1, 0, NULL);
 327                         break;
 328                 case OBJ_TAG: {
 329                         struct tag *t = (struct tag *)o;
 330
 331                         printf("%stag %s%s\n",
 332                                         diff_get_color_opt(&rev.diffopt, DIFF_COMMIT),
 333                                         t->tag,
 334                                         diff_get_color_opt(&rev.diffopt, DIFF_RESET));
 335                         ret = show_object(o->sha1, 1, &rev);
 336                         if (ret)
 337                                 break;
 338                         o = parse_object(t->tagged->sha1);
 339                         if (!o)
 340                                 ret = error("Could not read object %s",
 341                                             sha1_to_hex(t->tagged->sha1));
 342                         objects[i].item = o;
 343                         i--;
 344                         break;
 345                 }
 346                 case OBJ_TREE:
 347                         printf("%stree %s%s\n\n",
 348                                         diff_get_color_opt(&rev.diffopt, DIFF_COMMIT),
 349                                         name,
 350                                         diff_get_color_opt(&rev.diffopt, DIFF_RESET));
 351                         read_tree_recursive((struct tree *)o, "", 0, 0, NULL,
 352                                         show_tree_object, NULL);
 353                         break;
 354                 case OBJ_COMMIT:
 355                         rev.pending.nr = rev.pending.alloc = 0;
 356                         rev.pending.objects = NULL;
 357                         add_object_array(o, name, &rev.pending);
 358                         ret = cmd_log_walk(&rev);
 359                         break;
 360                 default:
 361                         ret = error("Unknown type: %d", o->type);
 362                 }
 363         }
 364         free(objects);
 365         return ret;
 366 }
 367
 368 /*
 369  * This is equivalent to "git log -g --abbrev-commit --pretty=oneline"
 370  */
 371 int cmd_log_reflog(int argc, const char **argv, const char *prefix)
 372 {
 373         struct rev_info rev;
 374
 375         git_config(git_log_config, NULL);
 376
 377         if (diff_use_color_default == -1)
 378                 diff_use_color_default = git_use_color_default;
 379
 380         init_revisions(&rev, prefix);
 381         init_reflog_walk(&rev.reflog_info);
 382         rev.abbrev_commit = 1;
 383         rev.verbose_header = 1;
 384         cmd_log_init(argc, argv, prefix, &rev);
 385
 386         /*
 387          * This means that we override whatever commit format the user gave
 388          * on the cmd line.  Sad, but cmd_log_init() currently doesn't
 389          * allow us to set a different default.
 390          */
 391         rev.commit_format = CMIT_FMT_ONELINE;
 392         rev.use_terminator = 1;
 393         rev.always_show_header = 1;
 394
 395         /*
 396          * We get called through "git reflog", so unlike the other log
 397          * routines, we need to set up our pager manually..
 398          */
 399         setup_pager();
 400
 401         return cmd_log_walk(&rev);
 402 }
 403
 404 int cmd_log(int argc, const char **argv, const char *prefix)
 405 {
 406         struct rev_info rev;
 407
 408         git_config(git_log_config, NULL);
 409
 410         if (diff_use_color_default == -1)
 411                 diff_use_color_default = git_use_color_default;
 412
 413         init_revisions(&rev, prefix);
 414         rev.always_show_header = 1;
 415         cmd_log_init(argc, argv, prefix, &rev);
 416         return cmd_log_walk(&rev);
 417 }
 418
 419 /* format-patch */
 420
 421 static const char *fmt_patch_suffix = ".patch";
 422 static int numbered = 0;
 423 static int auto_number = 1;
 424
 425 static char *default_attach = NULL;
 426
 427 static char **extra_hdr;
 428 static int extra_hdr_nr;
 429 static int extra_hdr_alloc;
 430
 431 static char **extra_to;
 432 static int extra_to_nr;
 433 static int extra_to_alloc;
 434
 435 static char **extra_cc;
 436 static int extra_cc_nr;
 437 static int extra_cc_alloc;
 438
 439 static void add_header(const char *value)
 440 {
 441         int len = strlen(value);
 442         while (len && value[len - 1] == '\n')
 443                 len--;
 444         if (!strncasecmp(value, "to: ", 4)) {
 445                 ALLOC_GROW(extra_to, extra_to_nr + 1, extra_to_alloc);
 446                 extra_to[extra_to_nr++] = xstrndup(value + 4, len - 4);
 447                 return;
 448         }
 449         if (!strncasecmp(value, "cc: ", 4)) {
 450                 ALLOC_GROW(extra_cc, extra_cc_nr + 1, extra_cc_alloc);
 451                 extra_cc[extra_cc_nr++] = xstrndup(value + 4, len - 4);
 452                 return;
 453         }
 454         ALLOC_GROW(extra_hdr, extra_hdr_nr + 1, extra_hdr_alloc);
 455         extra_hdr[extra_hdr_nr++] = xstrndup(value, len);
 456 }
 457
 458 #define THREAD_SHALLOW 1
 459 #define THREAD_DEEP 2
 460 static int thread = 0;
 461 static int do_signoff = 0;
 462
 463 static int git_format_config(const char *var, const char *value, void *cb)
 464 {
 465         if (!strcmp(var, "format.headers")) {
 466                 if (!value)
 467                         die("format.headers without value");
 468                 add_header(value);
 469                 return 0;
 470         }
 471         if (!strcmp(var, "format.suffix"))
 472                 return git_config_string(&fmt_patch_suffix, var, value);
 473         if (!strcmp(var, "format.cc")) {
 474                 if (!value)
 475                         return config_error_nonbool(var);
 476                 ALLOC_GROW(extra_cc, extra_cc_nr + 1, extra_cc_alloc);
 477                 extra_cc[extra_cc_nr++] = xstrdup(value);
 478                 return 0;
 479         }
 480         if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
 481                 return 0;
 482         }
 483         if (!strcmp(var, "format.numbered")) {
 484                 if (value && !strcasecmp(value, "auto")) {
 485                         auto_number = 1;
 486                         return 0;
 487                 }
 488                 numbered = git_config_bool(var, value);
 489                 auto_number = auto_number && numbered;
 490                 return 0;
 491         }
 492         if (!strcmp(var, "format.attach")) {
 493                 if (value && *value)
 494                         default_attach = xstrdup(value);
 495                 else
 496                         default_attach = xstrdup(git_version_string);
 497                 return 0;
 498         }
 499         if (!strcmp(var, "format.thread")) {
 500                 if (value && !strcasecmp(value, "deep")) {
 501                         thread = THREAD_DEEP;
 502                         return 0;
 503                 }
 504                 if (value && !strcasecmp(value, "shallow")) {
 505                         thread = THREAD_SHALLOW;
 506                         return 0;
 507                 }
 508                 thread = git_config_bool(var, value) && THREAD_SHALLOW;
 509                 return 0;
 510         }
 511         if (!strcmp(var, "format.signoff")) {
 512                 do_signoff = git_config_bool(var, value);
 513                 return 0;
 514         }
 515
 516         return git_log_config(var, value, cb);
 517 }
 518
 519 static FILE *realstdout = NULL;
 520 static const char *output_directory = NULL;
 521 static int outdir_offset;
 522
 523 static int reopen_stdout(struct commit *commit, struct rev_info *rev)
 524 {
 525         struct strbuf filename = STRBUF_INIT;
 526         int suffix_len = strlen(fmt_patch_suffix) + 1;
 527
 528         if (output_directory) {
 529                 strbuf_addstr(&filename, output_directory);
 530                 if (filename.len >=
 531                     PATH_MAX - FORMAT_PATCH_NAME_MAX - suffix_len)
 532                         return error("name of output directory is too long");
 533                 if (filename.buf[filename.len - 1] != '/')
 534                         strbuf_addch(&filename, '/');
 535         }
 536
 537         get_patch_filename(commit, rev->nr, fmt_patch_suffix, &filename);
 538
 539         if (!DIFF_OPT_TST(&rev->diffopt, QUIET))
 540                 fprintf(realstdout, "%s\n", filename.buf + outdir_offset);
 541
 542         if (freopen(filename.buf, "w", stdout) == NULL)
 543                 return error("Cannot open patch file %s", filename.buf);
 544
 545         strbuf_release(&filename);
 546         return 0;
 547 }
 548
 549 static void get_patch_ids(struct rev_info *rev, struct patch_ids *ids, const char *prefix)
 550 {
 551         struct rev_info check_rev;
 552         struct commit *commit;
 553         struct object *o1, *o2;
 554         unsigned flags1, flags2;
 555
 556         if (rev->pending.nr != 2)
 557                 die("Need exactly one range.");
 558
 559         o1 = rev->pending.objects[0].item;
 560         flags1 = o1->flags;
 561         o2 = rev->pending.objects[1].item;
 562         flags2 = o2->flags;
 563
 564         if ((flags1 & UNINTERESTING) == (flags2 & UNINTERESTING))
 565                 die("Not a range.");
 566
 567         init_patch_ids(ids);
 568
 569         /* given a range a..b get all patch ids for b..a */
 570         init_revisions(&check_rev, prefix);
 571         o1->flags ^= UNINTERESTING;
 572         o2->flags ^= UNINTERESTING;
 573         add_pending_object(&check_rev, o1, "o1");
 574         add_pending_object(&check_rev, o2, "o2");
 575         if (prepare_revision_walk(&check_rev))
 576                 die("revision walk setup failed");
 577
 578         while ((commit = get_revision(&check_rev)) != NULL) {
 579                 /* ignore merges */
 580                 if (commit->parents && commit->parents->next)
 581                         continue;
 582
 583                 add_commit_patch_id(commit, ids);
 584         }
 585
 586         /* reset for next revision walk */
 587         clear_commit_marks((struct commit *)o1,
 588                         SEEN | UNINTERESTING | SHOWN | ADDED);
 589         clear_commit_marks((struct commit *)o2,
 590                         SEEN | UNINTERESTING | SHOWN | ADDED);
 591         o1->flags = flags1;
 592         o2->flags = flags2;
 593 }
 594
 595 static void gen_message_id(struct rev_info *info, char *base)
 596 {
 597         const char *committer = git_committer_info(IDENT_WARN_ON_NO_NAME);
 598         const char *email_start = strrchr(committer, '<');
 599         const char *email_end = strrchr(committer, '>');
 600         struct strbuf buf = STRBUF_INIT;
 601         if (!email_start || !email_end || email_start > email_end - 1)
 602                 die("Could not extract email from committer identity.");
 603         strbuf_addf(&buf, "%s.%lu.git.%.*s", base,
 604                     (unsigned long) time(NULL),
 605                     (int)(email_end - email_start - 1), email_start + 1);
 606         info->message_id = strbuf_detach(&buf, NULL);
 607 }
 608
 609 static void make_cover_letter(struct rev_info *rev, int use_stdout,
 610                               int numbered, int numbered_files,
 611                               struct commit *origin,
 612                               int nr, struct commit **list, struct commit *head)
 613 {
 614         const char *committer;
 615         const char *subject_start = NULL;
 616         const char *body = "*** SUBJECT HERE ***\n\n*** BLURB HERE ***\n";
 617         const char *msg;
 618         const char *extra_headers = rev->extra_headers;
 619         struct shortlog log;
 620         struct strbuf sb = STRBUF_INIT;
 621         int i;
 622         const char *encoding = "utf-8";
 623         struct diff_options opts;
 624         int need_8bit_cte = 0;
 625         struct commit *commit = NULL;
 626
 627         if (rev->commit_format != CMIT_FMT_EMAIL)
 628                 die("Cover letter needs email format");
 629
 630         committer = git_committer_info(0);
 631
 632         if (!numbered_files) {
 633                 /*
 634                  * We fake a commit for the cover letter so we get the filename
 635                  * desired.
 636                  */
 637                 commit = xcalloc(1, sizeof(*commit));
 638                 commit->buffer = xmalloc(400);
 639                 snprintf(commit->buffer, 400,
 640                         "tree 0000000000000000000000000000000000000000\n"
 641                         "parent %s\n"
 642                         "author %s\n"
 643                         "committer %s\n\n"
 644                         "cover letter\n",
 645                         sha1_to_hex(head->object.sha1), committer, committer);
 646         }
 647
 648         if (!use_stdout && reopen_stdout(commit, rev))
 649                 return;
 650
 651         if (commit) {
 652
 653                 free(commit->buffer);
 654                 free(commit);
 655         }
 656
 657         log_write_email_headers(rev, head, &subject_start, &extra_headers,
 658                                 &need_8bit_cte);
 659
 660         msg = body;
 661         pp_user_info(NULL, CMIT_FMT_EMAIL, &sb, committer, DATE_RFC2822,
 662                      encoding);
 663         pp_title_line(CMIT_FMT_EMAIL, &msg, &sb, subject_start, extra_headers,
 664                       encoding, need_8bit_cte);
 665         pp_remainder(CMIT_FMT_EMAIL, &msg, &sb, 0);
 666         printf("%s\n", sb.buf);
 667
 668         strbuf_release(&sb);
 669
 670         shortlog_init(&log);
 671         log.wrap_lines = 1;
 672         log.wrap = 72;
 673         log.in1 = 2;
 674         log.in2 = 4;
 675         for (i = 0; i < nr; i++)
 676                 shortlog_add_commit(&log, list[i]);
 677
 678         shortlog_output(&log);
 679
 680         /*
 681          * We can only do diffstat with a unique reference point
 682          */
 683         if (!origin)
 684                 return;
 685
 686         memcpy(&opts, &rev->diffopt, sizeof(opts));
 687         opts.output_format = DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT;
 688
 689         diff_setup_done(&opts);
 690
 691         diff_tree_sha1(origin->tree->object.sha1,
 692                        head->tree->object.sha1,
 693                        "", &opts);
 694         diffcore_std(&opts);
 695         diff_flush(&opts);
 696
 697         printf("\n");
 698 }
 699
 700 static const char *clean_message_id(const char *msg_id)
 701 {
 702         char ch;
 703         const char *a, *z, *m;
 704
 705         m = msg_id;
 706         while ((ch = *m) && (isspace(ch) || (ch == '<')))
 707                 m++;
 708         a = m;
 709         z = NULL;
 710         while ((ch = *m)) {
 711                 if (!isspace(ch) && (ch != '>'))
 712                         z = m;
 713                 m++;
 714         }
 715         if (!z)
 716                 die("insane in-reply-to: %s", msg_id);
 717         if (++z == m)
 718                 return a;
 719         return xmemdupz(a, z - a);
 720 }
 721
 722 static const char *set_outdir(const char *prefix, const char *output_directory)
 723 {
 724         if (output_directory && is_absolute_path(output_directory))
 725                 return output_directory;
 726
 727         if (!prefix || !*prefix) {
 728                 if (output_directory)
 729                         return output_directory;
 730                 /* The user did not explicitly ask for "./" */
 731                 outdir_offset = 2;
 732                 return "./";
 733         }
 734
 735         outdir_offset = strlen(prefix);
 736         if (!output_directory)
 737                 return prefix;
 738
 739         return xstrdup(prefix_filename(prefix, outdir_offset,
 740                                        output_directory));
 741 }
 742
 743 int cmd_format_patch(int argc, const char **argv, const char *prefix)
 744 {
 745         struct commit *commit;
 746         struct commit **list = NULL;
 747         struct rev_info rev;
 748         int nr = 0, total, i, j;
 749         int use_stdout = 0;
 750         int start_number = -1;
 751         int keep_subject = 0;
 752         int numbered_files = 0;         /* _just_ numbers */
 753         int subject_prefix = 0;
 754         int ignore_if_in_upstream = 0;
 755         int cover_letter = 0;
 756         int boundary_count = 0;
 757         int no_binary_diff = 0;
 758         struct commit *origin = NULL, *head = NULL;
 759         const char *in_reply_to = NULL;
 760         struct patch_ids ids;
 761         char *add_signoff = NULL;
 762         struct strbuf buf = STRBUF_INIT;
 763
 764         git_config(git_format_config, NULL);
 765         init_revisions(&rev, prefix);
 766         rev.commit_format = CMIT_FMT_EMAIL;
 767         rev.verbose_header = 1;
 768         rev.diff = 1;
 769         rev.combine_merges = 0;
 770         rev.ignore_merges = 1;
 771         DIFF_OPT_SET(&rev.diffopt, RECURSIVE);
 772
 773         rev.subject_prefix = fmt_patch_subject_prefix;
 774
 775         if (default_attach) {
 776                 rev.mime_boundary = default_attach;
 777                 rev.no_inline = 1;
 778         }
 779
 780         /*
 781          * Parse the arguments before setup_revisions(), or something
 782          * like "git format-patch -o a123 HEAD^.." may fail; a123 is
 783          * possibly a valid SHA1.
 784          */
 785         for (i = 1, j = 1; i < argc; i++) {
 786                 if (!strcmp(argv[i], "--stdout"))
 787                         use_stdout = 1;
 788                 else if (!strcmp(argv[i], "-n") ||
 789                                 !strcmp(argv[i], "--numbered"))
 790                         numbered = 1;
 791                 else if (!strcmp(argv[i], "-N") ||
 792                                 !strcmp(argv[i], "--no-numbered")) {
 793                         numbered = 0;
 794                         auto_number = 0;
 795                 }
 796                 else if (!prefixcmp(argv[i], "--start-number="))
 797                         start_number = strtol(argv[i] + 15, NULL, 10);
 798                 else if (!strcmp(argv[i], "--numbered-files"))
 799                         numbered_files = 1;
 800                 else if (!strcmp(argv[i], "--start-number")) {
 801                         i++;
 802                         if (i == argc)
 803                                 die("Need a number for --start-number");
 804                         start_number = strtol(argv[i], NULL, 10);
 805                 }
 806                 else if (!prefixcmp(argv[i], "--cc=")) {
 807                         ALLOC_GROW(extra_cc, extra_cc_nr + 1, extra_cc_alloc);
 808                         extra_cc[extra_cc_nr++] = xstrdup(argv[i] + 5);
 809                 }
 810                 else if (!strcmp(argv[i], "-k") ||
 811                                 !strcmp(argv[i], "--keep-subject")) {
 812                         keep_subject = 1;
 813                         rev.total = -1;
 814                 }
 815                 else if (!strcmp(argv[i], "--output-directory") ||
 816                          !strcmp(argv[i], "-o")) {
 817                         i++;
 818                         if (argc <= i)
 819                                 die("Which directory?");
 820                         if (output_directory)
 821                                 die("Two output directories?");
 822                         output_directory = argv[i];
 823                 }
 824                 else if (!strcmp(argv[i], "--signoff") ||
 825                          !strcmp(argv[i], "-s")) {
 826                         do_signoff = 1;
 827                 }
 828                 else if (!strcmp(argv[i], "--attach")) {
 829                         rev.mime_boundary = git_version_string;
 830                         rev.no_inline = 1;
 831                 }
 832                 else if (!prefixcmp(argv[i], "--attach=")) {
 833                         rev.mime_boundary = argv[i] + 9;
 834                         rev.no_inline = 1;
 835                 }
 836                 else if (!strcmp(argv[i], "--no-attach")) {
 837                         rev.mime_boundary = NULL;
 838                         rev.no_inline = 0;
 839                 }
 840                 else if (!strcmp(argv[i], "--inline")) {
 841                         rev.mime_boundary = git_version_string;
 842                         rev.no_inline = 0;
 843                 }
 844                 else if (!prefixcmp(argv[i], "--inline=")) {
 845                         rev.mime_boundary = argv[i] + 9;
 846                         rev.no_inline = 0;
 847                 }
 848                 else if (!strcmp(argv[i], "--ignore-if-in-upstream"))
 849                         ignore_if_in_upstream = 1;
 850                 else if (!strcmp(argv[i], "--thread")
 851                         || !strcmp(argv[i], "--thread=shallow"))
 852                         thread = THREAD_SHALLOW;
 853                 else if (!strcmp(argv[i], "--thread=deep"))
 854                         thread = THREAD_DEEP;
 855                 else if (!strcmp(argv[i], "--no-thread"))
 856                         thread = 0;
 857                 else if (!prefixcmp(argv[i], "--in-reply-to="))
 858                         in_reply_to = argv[i] + 14;
 859                 else if (!strcmp(argv[i], "--in-reply-to")) {
 860                         i++;
 861                         if (i == argc)
 862                                 die("Need a Message-Id for --in-reply-to");
 863                         in_reply_to = argv[i];
 864                 } else if (!prefixcmp(argv[i], "--subject-prefix=")) {
 865                         subject_prefix = 1;
 866                         rev.subject_prefix = argv[i] + 17;
 867                 } else if (!prefixcmp(argv[i], "--suffix="))
 868                         fmt_patch_suffix = argv[i] + 9;
 869                 else if (!strcmp(argv[i], "--cover-letter"))
 870                         cover_letter = 1;
 871                 else if (!strcmp(argv[i], "--no-binary"))
 872                         no_binary_diff = 1;
 873                 else if (!prefixcmp(argv[i], "--add-header="))
 874                         add_header(argv[i] + 13);
 875                 else
 876                         argv[j++] = argv[i];
 877         }
 878         argc = j;
 879
 880         if (do_signoff) {
 881                 const char *committer;
 882                 const char *endpos;
 883                 committer = git_committer_info(IDENT_ERROR_ON_NO_NAME);
 884                 endpos = strchr(committer, '>');
 885                 if (!endpos)
 886                         die("bogus committer info %s", committer);
 887                 add_signoff = xmemdupz(committer, endpos - committer + 1);
 888         }
 889
 890         for (i = 0; i < extra_hdr_nr; i++) {
 891                 strbuf_addstr(&buf, extra_hdr[i]);
 892                 strbuf_addch(&buf, '\n');
 893         }
 894
 895         if (extra_to_nr)
 896                 strbuf_addstr(&buf, "To: ");
 897         for (i = 0; i < extra_to_nr; i++) {
 898                 if (i)
 899                         strbuf_addstr(&buf, "    ");
 900                 strbuf_addstr(&buf, extra_to[i]);
 901                 if (i + 1 < extra_to_nr)
 902                         strbuf_addch(&buf, ',');
 903                 strbuf_addch(&buf, '\n');
 904         }
 905
 906         if (extra_cc_nr)
 907                 strbuf_addstr(&buf, "Cc: ");
 908         for (i = 0; i < extra_cc_nr; i++) {
 909                 if (i)
 910                         strbuf_addstr(&buf, "    ");
 911                 strbuf_addstr(&buf, extra_cc[i]);
 912                 if (i + 1 < extra_cc_nr)
 913                         strbuf_addch(&buf, ',');
 914                 strbuf_addch(&buf, '\n');
 915         }
 916
 917         rev.extra_headers = strbuf_detach(&buf, 0);
 918
 919         if (start_number < 0)
 920                 start_number = 1;
 921         if (numbered && keep_subject)
 922                 die ("-n and -k are mutually exclusive.");
 923         if (keep_subject && subject_prefix)
 924                 die ("--subject-prefix and -k are mutually exclusive.");
 925
 926         argc = setup_revisions(argc, argv, &rev, "HEAD");
 927         if (argc > 1)
 928                 die ("unrecognized argument: %s", argv[1]);
 929
 930         if (!rev.diffopt.output_format
 931                 || rev.diffopt.output_format == DIFF_FORMAT_PATCH)
 932                 rev.diffopt.output_format = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_SUMMARY | DIFF_FORMAT_PATCH;
 933
 934         if (!DIFF_OPT_TST(&rev.diffopt, TEXT) && !no_binary_diff)
 935                 DIFF_OPT_SET(&rev.diffopt, BINARY);
 936
 937         if (!use_stdout)
 938                 output_directory = set_outdir(prefix, output_directory);
 939
 940         if (output_directory) {
 941                 if (use_stdout)
 942                         die("standard output, or directory, which one?");
 943                 if (mkdir(output_directory, 0777) < 0 && errno != EEXIST)
 944                         die("Could not create directory %s",
 945                             output_directory);
 946         }
 947
 948         if (rev.pending.nr == 1) {
 949                 if (rev.max_count < 0 && !rev.show_root_diff) {
 950                         /*
 951                          * This is traditional behaviour of "git format-patch
 952                          * origin" that prepares what the origin side still
 953                          * does not have.
 954                          */
 955                         rev.pending.objects[0].item->flags |= UNINTERESTING;
 956                         add_head_to_pending(&rev);
 957                 }
 958                 /*
 959                  * Otherwise, it is "format-patch -22 HEAD", and/or
 960                  * "format-patch --root HEAD".  The user wants
 961                  * get_revision() to do the usual traversal.
 962                  */
 963         }
 964
 965         /*
 966          * We cannot move this anywhere earlier because we do want to
 967          * know if --root was given explicitly from the comand line.
 968          */
 969         rev.show_root_diff = 1;
 970
 971         if (cover_letter) {
 972                 /* remember the range */
 973                 int i;
 974                 for (i = 0; i < rev.pending.nr; i++) {
 975                         struct object *o = rev.pending.objects[i].item;
 976                         if (!(o->flags & UNINTERESTING))
 977                                 head = (struct commit *)o;
 978                 }
 979                 /* We can't generate a cover letter without any patches */
 980                 if (!head)
 981                         return 0;
 982         }
 983
 984         if (ignore_if_in_upstream)
 985                 get_patch_ids(&rev, &ids, prefix);
 986
 987         if (!use_stdout)
 988                 realstdout = xfdopen(xdup(1), "w");
 989
 990         if (prepare_revision_walk(&rev))
 991                 die("revision walk setup failed");
 992         rev.boundary = 1;
 993         while ((commit = get_revision(&rev)) != NULL) {
 994                 if (commit->object.flags & BOUNDARY) {
 995                         boundary_count++;
 996                         origin = (boundary_count == 1) ? commit : NULL;
 997                         continue;
 998                 }
 999
1000                 /* ignore merges */
1001                 if (commit->parents && commit->parents->next)
1002                         continue;
1003
1004                 if (ignore_if_in_upstream &&
1005                                 has_commit_patch_id(commit, &ids))
1006                         continue;
1007
1008                 nr++;
1009                 list = xrealloc(list, nr * sizeof(list[0]));
1010                 list[nr - 1] = commit;
1011         }
1012         total = nr;
1013         if (!keep_subject && auto_number && total > 1)
1014                 numbered = 1;
1015         if (numbered)
1016                 rev.total = total + start_number - 1;
1017         if (in_reply_to || thread || cover_letter)
1018                 rev.ref_message_ids = xcalloc(1, sizeof(struct string_list));
1019         if (in_reply_to) {
1020                 const char *msgid = clean_message_id(in_reply_to);
1021                 string_list_append(msgid, rev.ref_message_ids);
1022         }
1023         rev.numbered_files = numbered_files;
1024         rev.patch_suffix = fmt_patch_suffix;
1025         if (cover_letter) {
1026                 if (thread)
1027                         gen_message_id(&rev, "cover");
1028                 make_cover_letter(&rev, use_stdout, numbered, numbered_files,
1029                                   origin, nr, list, head);
1030                 total++;
1031                 start_number--;
1032         }
1033         rev.add_signoff = add_signoff;
1034         while (0 <= --nr) {
1035                 int shown;
1036                 commit = list[nr];
1037                 rev.nr = total - nr + (start_number - 1);
1038                 /* Make the second and subsequent mails replies to the first */
1039                 if (thread) {
1040                         /* Have we already had a message ID? */
1041                         if (rev.message_id) {
1042                                 /*
1043                                  * For deep threading: make every mail
1044                                  * a reply to the previous one, no
1045                                  * matter what other options are set.
1046                                  *
1047                                  * For shallow threading:
1048                                  *
1049                                  * Without --cover-letter and
1050                                  * --in-reply-to, make every mail a
1051                                  * reply to the one before.
1052                                  *
1053                                  * With --in-reply-to but no
1054                                  * --cover-letter, make every mail a
1055                                  * reply to the <reply-to>.
1056                                  *
1057                                  * With --cover-letter, make every
1058                                  * mail but the cover letter a reply
1059                                  * to the cover letter.  The cover
1060                                  * letter is a reply to the
1061                                  * --in-reply-to, if specified.
1062                                  */
1063                                 if (thread == THREAD_SHALLOW
1064                                     && rev.ref_message_ids->nr > 0
1065                                     && (!cover_letter || rev.nr > 1))
1066                                         free(rev.message_id);
1067                                 else
1068                                         string_list_append(rev.message_id,
1069                                                            rev.ref_message_ids);
1070                         }
1071                         gen_message_id(&rev, sha1_to_hex(commit->object.sha1));
1072                 }
1073
1074                 if (!use_stdout && reopen_stdout(numbered_files ? NULL : commit,
1075                                                  &rev))
1076                         die("Failed to create output files");
1077                 shown = log_tree_commit(&rev, commit);
1078                 free(commit->buffer);
1079                 commit->buffer = NULL;
1080
1081                 /* We put one extra blank line between formatted
1082                  * patches and this flag is used by log-tree code
1083                  * to see if it needs to emit a LF before showing
1084                  * the log; when using one file per patch, we do
1085                  * not want the extra blank line.
1086                  */
1087                 if (!use_stdout)
1088                         rev.shown_one = 0;
1089                 if (shown) {
1090                         if (rev.mime_boundary)
1091                                 printf("\n--%s%s--\n\n\n",
1092                                        mime_boundary_leader,
1093                                        rev.mime_boundary);
1094                         else
1095                                 printf("-- \n%s\n\n", git_version_string);
1096                 }
1097                 if (!use_stdout)
1098                         fclose(stdout);
1099         }
1100         free(list);
1101         if (ignore_if_in_upstream)
1102                 free_patch_ids(&ids);
1103         return 0;
1104 }
1105
1106 static int add_pending_commit(const char *arg, struct rev_info *revs, int flags)
1107 {
1108         unsigned char sha1[20];
1109         if (get_sha1(arg, sha1) == 0) {
1110                 struct commit *commit = lookup_commit_reference(sha1);
1111                 if (commit) {
1112                         commit->object.flags |= flags;
1113                         add_pending_object(revs, &commit->object, arg);
1114                         return 0;
1115                 }
1116         }
1117         return -1;
1118 }
1119
1120 static const char cherry_usage[] =
1121 "git cherry [-v] [<upstream> [<head> [<limit>]]]";
1122 int cmd_cherry(int argc, const char **argv, const char *prefix)
1123 {
1124         struct rev_info revs;
1125         struct patch_ids ids;
1126         struct commit *commit;
1127         struct commit_list *list = NULL;
1128         struct branch *current_branch;
1129         const char *upstream;
1130         const char *head = "HEAD";
1131         const char *limit = NULL;
1132         int verbose = 0;
1133
1134         if (argc > 1 && !strcmp(argv[1], "-v")) {
1135                 verbose = 1;
1136                 argc--;
1137                 argv++;
1138         }
1139
1140         switch (argc) {
1141         case 4:
1142                 limit = argv[3];
1143                 /* FALLTHROUGH */
1144         case 3:
1145                 head = argv[2];
1146                 /* FALLTHROUGH */
1147         case 2:
1148                 upstream = argv[1];
1149                 break;
1150         default:
1151                 current_branch = branch_get(NULL);
1152                 if (!current_branch || !current_branch->merge
1153                                         || !current_branch->merge[0]
1154                                         || !current_branch->merge[0]->dst) {
1155                         fprintf(stderr, "Could not find a tracked"
1156                                         " remote branch, please"
1157                                         " specify <upstream> manually.\n");
1158                         usage(cherry_usage);
1159                 }
1160
1161                 upstream = current_branch->merge[0]->dst;
1162         }
1163
1164         init_revisions(&revs, prefix);
1165         revs.diff = 1;
1166         revs.combine_merges = 0;
1167         revs.ignore_merges = 1;
1168         DIFF_OPT_SET(&revs.diffopt, RECURSIVE);
1169
1170         if (add_pending_commit(head, &revs, 0))
1171                 die("Unknown commit %s", head);
1172         if (add_pending_commit(upstream, &revs, UNINTERESTING))
1173                 die("Unknown commit %s", upstream);
1174
1175         /* Don't say anything if head and upstream are the same. */
1176         if (revs.pending.nr == 2) {
1177                 struct object_array_entry *o = revs.pending.objects;
1178                 if (hashcmp(o[0].item->sha1, o[1].item->sha1) == 0)
1179                         return 0;
1180         }
1181
1182         get_patch_ids(&revs, &ids, prefix);
1183
1184         if (limit && add_pending_commit(limit, &revs, UNINTERESTING))
1185                 die("Unknown commit %s", limit);
1186
1187         /* reverse the list of commits */
1188         if (prepare_revision_walk(&revs))
1189                 die("revision walk setup failed");
1190         while ((commit = get_revision(&revs)) != NULL) {
1191                 /* ignore merges */
1192                 if (commit->parents && commit->parents->next)
1193                         continue;
1194
1195                 commit_list_insert(commit, &list);
1196         }
1197
1198         while (list) {
1199                 char sign = '+';
1200
1201                 commit = list->item;
1202                 if (has_commit_patch_id(commit, &ids))
1203                         sign = '-';
1204
1205                 if (verbose) {
1206                         struct strbuf buf = STRBUF_INIT;
1207                         pretty_print_commit(CMIT_FMT_ONELINE, commit,
1208                                             &buf, 0, NULL, NULL, 0, 0);
1209                         printf("%c %s %s\n", sign,
1210                                sha1_to_hex(commit->object.sha1), buf.buf);
1211                         strbuf_release(&buf);
1212                 }
1213                 else {
1214                         printf("%c %s\n", sign,
1215                                sha1_to_hex(commit->object.sha1));
1216                 }
1217
1218                 list = list->next;
1219         }
1220
1221         free_patch_ids(&ids);
1222         return 0;
1223 }