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 #define USE_THE_INDEX_COMPATIBILITY_MACROS
   8 #include "cache.h"
   9 #include "config.h"
  10 #include "refs.h"
  11 #include "object-store.h"
  12 #include "color.h"
  13 #include "commit.h"
  14 #include "diff.h"
  15 #include "revision.h"
  16 #include "log-tree.h"
  17 #include "builtin.h"
  18 #include "tag.h"
  19 #include "reflog-walk.h"
  20 #include "patch-ids.h"
  21 #include "run-command.h"
  22 #include "shortlog.h"
  23 #include "remote.h"
  24 #include "string-list.h"
  25 #include "parse-options.h"
  26 #include "line-log.h"
  27 #include "branch.h"
  28 #include "streaming.h"
  29 #include "version.h"
  30 #include "mailmap.h"
  31 #include "gpg-interface.h"
  32 #include "progress.h"
  33 #include "commit-slab.h"
  34 #include "repository.h"
  35 #include "commit-reach.h"
  36 #include "interdiff.h"
  37 #include "range-diff.h"
  38
  39 #define MAIL_DEFAULT_WRAP 72
  40
  41 /* Set a default date-time format for git log ("log.date" config variable) */
  42 static const char *default_date_mode = NULL;
  43
  44 static int default_abbrev_commit;
  45 static int default_show_root = 1;
  46 static int default_follow;
  47 static int default_show_signature;
  48 static int decoration_style;
  49 static int decoration_given;
  50 static int use_mailmap_config;
  51 static const char *fmt_patch_subject_prefix = "PATCH";
  52 static const char *fmt_pretty;
  53
  54 static const char * const builtin_log_usage[] = {
  55         N_("git log [<options>] [<revision-range>] [[--] <path>...]"),
  56         N_("git show [<options>] <object>..."),
  57         NULL
  58 };
  59
  60 struct line_opt_callback_data {
  61         struct rev_info *rev;
  62         const char *prefix;
  63         struct string_list args;
  64 };
  65
  66 static int auto_decoration_style(void)
  67 {
  68         return (isatty(1) || pager_in_use()) ? DECORATE_SHORT_REFS : 0;
  69 }
  70
  71 static int parse_decoration_style(const char *value)
  72 {
  73         switch (git_parse_maybe_bool(value)) {
  74         case 1:
  75                 return DECORATE_SHORT_REFS;
  76         case 0:
  77                 return 0;
  78         default:
  79                 break;
  80         }
  81         if (!strcmp(value, "full"))
  82                 return DECORATE_FULL_REFS;
  83         else if (!strcmp(value, "short"))
  84                 return DECORATE_SHORT_REFS;
  85         else if (!strcmp(value, "auto"))
  86                 return auto_decoration_style();
  87         return -1;
  88 }
  89
  90 static int decorate_callback(const struct option *opt, const char *arg, int unset)
  91 {
  92         if (unset)
  93                 decoration_style = 0;
  94         else if (arg)
  95                 decoration_style = parse_decoration_style(arg);
  96         else
  97                 decoration_style = DECORATE_SHORT_REFS;
  98
  99         if (decoration_style < 0)
 100                 die(_("invalid --decorate option: %s"), arg);
 101
 102         decoration_given = 1;
 103
 104         return 0;
 105 }
 106
 107 static int log_line_range_callback(const struct option *option, const char *arg, int unset)
 108 {
 109         struct line_opt_callback_data *data = option->value;
 110
 111         BUG_ON_OPT_NEG(unset);
 112
 113         if (!arg)
 114                 return -1;
 115
 116         data->rev->line_level_traverse = 1;
 117         string_list_append(&data->args, arg);
 118
 119         return 0;
 120 }
 121
 122 static void init_log_defaults(void)
 123 {
 124         init_grep_defaults(the_repository);
 125         init_diff_ui_defaults();
 126
 127         decoration_style = auto_decoration_style();
 128 }
 129
 130 static void cmd_log_init_defaults(struct rev_info *rev)
 131 {
 132         if (fmt_pretty)
 133                 get_commit_format(fmt_pretty, rev);
 134         if (default_follow)
 135                 rev->diffopt.flags.default_follow_renames = 1;
 136         rev->verbose_header = 1;
 137         rev->diffopt.flags.recursive = 1;
 138         rev->diffopt.stat_width = -1; /* use full terminal width */
 139         rev->diffopt.stat_graph_width = -1; /* respect statGraphWidth config */
 140         rev->abbrev_commit = default_abbrev_commit;
 141         rev->show_root_diff = default_show_root;
 142         rev->subject_prefix = fmt_patch_subject_prefix;
 143         rev->show_signature = default_show_signature;
 144         rev->diffopt.flags.allow_textconv = 1;
 145
 146         if (default_date_mode)
 147                 parse_date_format(default_date_mode, &rev->date_mode);
 148 }
 149
 150 static void cmd_log_init_finish(int argc, const char **argv, const char *prefix,
 151                          struct rev_info *rev, struct setup_revision_opt *opt)
 152 {
 153         struct userformat_want w;
 154         int quiet = 0, source = 0, mailmap = 0;
 155         static struct line_opt_callback_data line_cb = {NULL, NULL, STRING_LIST_INIT_DUP};
 156         static struct string_list decorate_refs_exclude = STRING_LIST_INIT_NODUP;
 157         static struct string_list decorate_refs_include = STRING_LIST_INIT_NODUP;
 158         struct decoration_filter decoration_filter = {&decorate_refs_include,
 159                                                       &decorate_refs_exclude};
 160         static struct revision_sources revision_sources;
 161
 162         const struct option builtin_log_options[] = {
 163                 OPT__QUIET(&quiet, N_("suppress diff output")),
 164                 OPT_BOOL(0, "source", &source, N_("show source")),
 165                 OPT_BOOL(0, "use-mailmap", &mailmap, N_("Use mail map file")),
 166                 OPT_STRING_LIST(0, "decorate-refs", &decorate_refs_include,
 167                                 N_("pattern"), N_("only decorate refs that match <pattern>")),
 168                 OPT_STRING_LIST(0, "decorate-refs-exclude", &decorate_refs_exclude,
 169                                 N_("pattern"), N_("do not decorate refs that match <pattern>")),
 170                 { OPTION_CALLBACK, 0, "decorate", NULL, NULL, N_("decorate options"),
 171                   PARSE_OPT_OPTARG, decorate_callback},
 172                 OPT_CALLBACK('L', NULL, &line_cb, "n,m:file",
 173                              N_("Process line range n,m in file, counting from 1"),
 174                              log_line_range_callback),
 175                 OPT_END()
 176         };
 177
 178         line_cb.rev = rev;
 179         line_cb.prefix = prefix;
 180
 181         mailmap = use_mailmap_config;
 182         argc = parse_options(argc, argv, prefix,
 183                              builtin_log_options, builtin_log_usage,
 184                              PARSE_OPT_KEEP_ARGV0 | PARSE_OPT_KEEP_UNKNOWN |
 185                              PARSE_OPT_KEEP_DASHDASH);
 186
 187         if (quiet)
 188                 rev->diffopt.output_format |= DIFF_FORMAT_NO_OUTPUT;
 189         argc = setup_revisions(argc, argv, rev, opt);
 190
 191         /* Any arguments at this point are not recognized */
 192         if (argc > 1)
 193                 die(_("unrecognized argument: %s"), argv[1]);
 194
 195         memset(&w, 0, sizeof(w));
 196         userformat_find_requirements(NULL, &w);
 197
 198         if (!rev->show_notes_given && (!rev->pretty_given || w.notes))
 199                 rev->show_notes = 1;
 200         if (rev->show_notes)
 201                 init_display_notes(&rev->notes_opt);
 202
 203         if ((rev->diffopt.pickaxe_opts & DIFF_PICKAXE_KINDS_MASK) ||
 204             rev->diffopt.filter || rev->diffopt.flags.follow_renames)
 205                 rev->always_show_header = 0;
 206
 207         if (source || w.source) {
 208                 init_revision_sources(&revision_sources);
 209                 rev->sources = &revision_sources;
 210         }
 211
 212         if (mailmap) {
 213                 rev->mailmap = xcalloc(1, sizeof(struct string_list));
 214                 read_mailmap(rev->mailmap, NULL);
 215         }
 216
 217         if (rev->pretty_given && rev->commit_format == CMIT_FMT_RAW) {
 218                 /*
 219                  * "log --pretty=raw" is special; ignore UI oriented
 220                  * configuration variables such as decoration.
 221                  */
 222                 if (!decoration_given)
 223                         decoration_style = 0;
 224                 if (!rev->abbrev_commit_given)
 225                         rev->abbrev_commit = 0;
 226         }
 227
 228         if (decoration_style) {
 229                 rev->show_decorations = 1;
 230                 load_ref_decorations(&decoration_filter, decoration_style);
 231         }
 232
 233         if (rev->line_level_traverse)
 234                 line_log_init(rev, line_cb.prefix, &line_cb.args);
 235
 236         setup_pager();
 237 }
 238
 239 static void cmd_log_init(int argc, const char **argv, const char *prefix,
 240                          struct rev_info *rev, struct setup_revision_opt *opt)
 241 {
 242         cmd_log_init_defaults(rev);
 243         cmd_log_init_finish(argc, argv, prefix, rev, opt);
 244 }
 245
 246 /*
 247  * This gives a rough estimate for how many commits we
 248  * will print out in the list.
 249  */
 250 static int estimate_commit_count(struct rev_info *rev, struct commit_list *list)
 251 {
 252         int n = 0;
 253
 254         while (list) {
 255                 struct commit *commit = list->item;
 256                 unsigned int flags = commit->object.flags;
 257                 list = list->next;
 258                 if (!(flags & (TREESAME | UNINTERESTING)))
 259                         n++;
 260         }
 261         return n;
 262 }
 263
 264 static void show_early_header(struct rev_info *rev, const char *stage, int nr)
 265 {
 266         if (rev->shown_one) {
 267                 rev->shown_one = 0;
 268                 if (rev->commit_format != CMIT_FMT_ONELINE)
 269                         putchar(rev->diffopt.line_termination);
 270         }
 271         fprintf(rev->diffopt.file, _("Final output: %d %s\n"), nr, stage);
 272 }
 273
 274 static struct itimerval early_output_timer;
 275
 276 static void log_show_early(struct rev_info *revs, struct commit_list *list)
 277 {
 278         int i = revs->early_output, close_file = revs->diffopt.close_file;
 279         int show_header = 1;
 280
 281         revs->diffopt.close_file = 0;
 282         sort_in_topological_order(&list, revs->sort_order);
 283         while (list && i) {
 284                 struct commit *commit = list->item;
 285                 switch (simplify_commit(revs, commit)) {
 286                 case commit_show:
 287                         if (show_header) {
 288                                 int n = estimate_commit_count(revs, list);
 289                                 show_early_header(revs, "incomplete", n);
 290                                 show_header = 0;
 291                         }
 292                         log_tree_commit(revs, commit);
 293                         i--;
 294                         break;
 295                 case commit_ignore:
 296                         break;
 297                 case commit_error:
 298                         if (close_file)
 299                                 fclose(revs->diffopt.file);
 300                         return;
 301                 }
 302                 list = list->next;
 303         }
 304
 305         /* Did we already get enough commits for the early output? */
 306         if (!i) {
 307                 if (close_file)
 308                         fclose(revs->diffopt.file);
 309                 return;
 310         }
 311
 312         /*
 313          * ..if no, then repeat it twice a second until we
 314          * do.
 315          *
 316          * NOTE! We don't use "it_interval", because if the
 317          * reader isn't listening, we want our output to be
 318          * throttled by the writing, and not have the timer
 319          * trigger every second even if we're blocked on a
 320          * reader!
 321          */
 322         early_output_timer.it_value.tv_sec = 0;
 323         early_output_timer.it_value.tv_usec = 500000;
 324         setitimer(ITIMER_REAL, &early_output_timer, NULL);
 325 }
 326
 327 static void early_output(int signal)
 328 {
 329         show_early_output = log_show_early;
 330 }
 331
 332 static void setup_early_output(struct rev_info *rev)
 333 {
 334         struct sigaction sa;
 335
 336         /*
 337          * Set up the signal handler, minimally intrusively:
 338          * we only set a single volatile integer word (not
 339          * using sigatomic_t - trying to avoid unnecessary
 340          * system dependencies and headers), and using
 341          * SA_RESTART.
 342          */
 343         memset(&sa, 0, sizeof(sa));
 344         sa.sa_handler = early_output;
 345         sigemptyset(&sa.sa_mask);
 346         sa.sa_flags = SA_RESTART;
 347         sigaction(SIGALRM, &sa, NULL);
 348
 349         /*
 350          * If we can get the whole output in less than a
 351          * tenth of a second, don't even bother doing the
 352          * early-output thing..
 353          *
 354          * This is a one-time-only trigger.
 355          */
 356         early_output_timer.it_value.tv_sec = 0;
 357         early_output_timer.it_value.tv_usec = 100000;
 358         setitimer(ITIMER_REAL, &early_output_timer, NULL);
 359 }
 360
 361 static void finish_early_output(struct rev_info *rev)
 362 {
 363         int n = estimate_commit_count(rev, rev->commits);
 364         signal(SIGALRM, SIG_IGN);
 365         show_early_header(rev, "done", n);
 366 }
 367
 368 static int cmd_log_walk(struct rev_info *rev)
 369 {
 370         struct commit *commit;
 371         int saved_nrl = 0;
 372         int saved_dcctc = 0, close_file = rev->diffopt.close_file;
 373
 374         if (rev->early_output)
 375                 setup_early_output(rev);
 376
 377         if (prepare_revision_walk(rev))
 378                 die(_("revision walk setup failed"));
 379
 380         if (rev->early_output)
 381                 finish_early_output(rev);
 382
 383         /*
 384          * For --check and --exit-code, the exit code is based on CHECK_FAILED
 385          * and HAS_CHANGES being accumulated in rev->diffopt, so be careful to
 386          * retain that state information if replacing rev->diffopt in this loop
 387          */
 388         rev->diffopt.close_file = 0;
 389         while ((commit = get_revision(rev)) != NULL) {
 390                 if (!log_tree_commit(rev, commit) && rev->max_count >= 0)
 391                         /*
 392                          * We decremented max_count in get_revision,
 393                          * but we didn't actually show the commit.
 394                          */
 395                         rev->max_count++;
 396                 if (!rev->reflog_info) {
 397                         /*
 398                          * We may show a given commit multiple times when
 399                          * walking the reflogs.
 400                          */
 401                         free_commit_buffer(the_repository->parsed_objects,
 402                                            commit);
 403                         free_commit_list(commit->parents);
 404                         commit->parents = NULL;
 405                 }
 406                 if (saved_nrl < rev->diffopt.needed_rename_limit)
 407                         saved_nrl = rev->diffopt.needed_rename_limit;
 408                 if (rev->diffopt.degraded_cc_to_c)
 409                         saved_dcctc = 1;
 410         }
 411         rev->diffopt.degraded_cc_to_c = saved_dcctc;
 412         rev->diffopt.needed_rename_limit = saved_nrl;
 413         if (close_file)
 414                 fclose(rev->diffopt.file);
 415
 416         if (rev->diffopt.output_format & DIFF_FORMAT_CHECKDIFF &&
 417             rev->diffopt.flags.check_failed) {
 418                 return 02;
 419         }
 420         return diff_result_code(&rev->diffopt, 0);
 421 }
 422
 423 static int git_log_config(const char *var, const char *value, void *cb)
 424 {
 425         const char *slot_name;
 426
 427         if (!strcmp(var, "format.pretty"))
 428                 return git_config_string(&fmt_pretty, var, value);
 429         if (!strcmp(var, "format.subjectprefix"))
 430                 return git_config_string(&fmt_patch_subject_prefix, var, value);
 431         if (!strcmp(var, "log.abbrevcommit")) {
 432                 default_abbrev_commit = git_config_bool(var, value);
 433                 return 0;
 434         }
 435         if (!strcmp(var, "log.date"))
 436                 return git_config_string(&default_date_mode, var, value);
 437         if (!strcmp(var, "log.decorate")) {
 438                 decoration_style = parse_decoration_style(value);
 439                 if (decoration_style < 0)
 440                         decoration_style = 0; /* maybe warn? */
 441                 return 0;
 442         }
 443         if (!strcmp(var, "log.showroot")) {
 444                 default_show_root = git_config_bool(var, value);
 445                 return 0;
 446         }
 447         if (!strcmp(var, "log.follow")) {
 448                 default_follow = git_config_bool(var, value);
 449                 return 0;
 450         }
 451         if (skip_prefix(var, "color.decorate.", &slot_name))
 452                 return parse_decorate_color_config(var, slot_name, value);
 453         if (!strcmp(var, "log.mailmap")) {
 454                 use_mailmap_config = git_config_bool(var, value);
 455                 return 0;
 456         }
 457         if (!strcmp(var, "log.showsignature")) {
 458                 default_show_signature = git_config_bool(var, value);
 459                 return 0;
 460         }
 461
 462         if (grep_config(var, value, cb) < 0)
 463                 return -1;
 464         if (git_gpg_config(var, value, cb) < 0)
 465                 return -1;
 466         return git_diff_ui_config(var, value, cb);
 467 }
 468
 469 int cmd_whatchanged(int argc, const char **argv, const char *prefix)
 470 {
 471         struct rev_info rev;
 472         struct setup_revision_opt opt;
 473
 474         init_log_defaults();
 475         git_config(git_log_config, NULL);
 476
 477         repo_init_revisions(the_repository, &rev, prefix);
 478         rev.diff = 1;
 479         rev.simplify_history = 0;
 480         memset(&opt, 0, sizeof(opt));
 481         opt.def = "HEAD";
 482         opt.revarg_opt = REVARG_COMMITTISH;
 483         cmd_log_init(argc, argv, prefix, &rev, &opt);
 484         if (!rev.diffopt.output_format)
 485                 rev.diffopt.output_format = DIFF_FORMAT_RAW;
 486         return cmd_log_walk(&rev);
 487 }
 488
 489 static void show_tagger(char *buf, int len, struct rev_info *rev)
 490 {
 491         struct strbuf out = STRBUF_INIT;
 492         struct pretty_print_context pp = {0};
 493
 494         pp.fmt = rev->commit_format;
 495         pp.date_mode = rev->date_mode;
 496         pp_user_info(&pp, "Tagger", &out, buf, get_log_output_encoding());
 497         fprintf(rev->diffopt.file, "%s", out.buf);
 498         strbuf_release(&out);
 499 }
 500
 501 static int show_blob_object(const struct object_id *oid, struct rev_info *rev, const char *obj_name)
 502 {
 503         struct object_id oidc;
 504         struct object_context obj_context;
 505         char *buf;
 506         unsigned long size;
 507
 508         fflush(rev->diffopt.file);
 509         if (!rev->diffopt.flags.textconv_set_via_cmdline ||
 510             !rev->diffopt.flags.allow_textconv)
 511                 return stream_blob_to_fd(1, oid, NULL, 0);
 512
 513         if (get_oid_with_context(the_repository, obj_name,
 514                                  GET_OID_RECORD_PATH,
 515                                  &oidc, &obj_context))
 516                 die(_("Not a valid object name %s"), obj_name);
 517         if (!obj_context.path ||
 518             !textconv_object(the_repository, obj_context.path,
 519                              obj_context.mode, &oidc, 1, &buf, &size)) {
 520                 free(obj_context.path);
 521                 return stream_blob_to_fd(1, oid, NULL, 0);
 522         }
 523
 524         if (!buf)
 525                 die(_("git show %s: bad file"), obj_name);
 526
 527         write_or_die(1, buf, size);
 528         free(obj_context.path);
 529         return 0;
 530 }
 531
 532 static int show_tag_object(const struct object_id *oid, struct rev_info *rev)
 533 {
 534         unsigned long size;
 535         enum object_type type;
 536         char *buf = read_object_file(oid, &type, &size);
 537         int offset = 0;
 538
 539         if (!buf)
 540                 return error(_("Could not read object %s"), oid_to_hex(oid));
 541
 542         assert(type == OBJ_TAG);
 543         while (offset < size && buf[offset] != '\n') {
 544                 int new_offset = offset + 1;
 545                 while (new_offset < size && buf[new_offset++] != '\n')
 546                         ; /* do nothing */
 547                 if (starts_with(buf + offset, "tagger "))
 548                         show_tagger(buf + offset + 7,
 549                                     new_offset - offset - 7, rev);
 550                 offset = new_offset;
 551         }
 552
 553         if (offset < size)
 554                 fwrite(buf + offset, size - offset, 1, rev->diffopt.file);
 555         free(buf);
 556         return 0;
 557 }
 558
 559 static int show_tree_object(const struct object_id *oid,
 560                 struct strbuf *base,
 561                 const char *pathname, unsigned mode, int stage, void *context)
 562 {
 563         FILE *file = context;
 564         fprintf(file, "%s%s\n", pathname, S_ISDIR(mode) ? "/" : "");
 565         return 0;
 566 }
 567
 568 static void show_setup_revisions_tweak(struct rev_info *rev,
 569                                        struct setup_revision_opt *opt)
 570 {
 571         if (rev->ignore_merges) {
 572                 /* There was no "-m" on the command line */
 573                 rev->ignore_merges = 0;
 574                 if (!rev->first_parent_only && !rev->combine_merges) {
 575                         /* No "--first-parent", "-c", or "--cc" */
 576                         rev->combine_merges = 1;
 577                         rev->dense_combined_merges = 1;
 578                 }
 579         }
 580         if (!rev->diffopt.output_format)
 581                 rev->diffopt.output_format = DIFF_FORMAT_PATCH;
 582 }
 583
 584 int cmd_show(int argc, const char **argv, const char *prefix)
 585 {
 586         struct rev_info rev;
 587         struct object_array_entry *objects;
 588         struct setup_revision_opt opt;
 589         struct pathspec match_all;
 590         int i, count, ret = 0;
 591
 592         init_log_defaults();
 593         git_config(git_log_config, NULL);
 594
 595         memset(&match_all, 0, sizeof(match_all));
 596         repo_init_revisions(the_repository, &rev, prefix);
 597         rev.diff = 1;
 598         rev.always_show_header = 1;
 599         rev.no_walk = REVISION_WALK_NO_WALK_SORTED;
 600         rev.diffopt.stat_width = -1;    /* Scale to real terminal size */
 601
 602         memset(&opt, 0, sizeof(opt));
 603         opt.def = "HEAD";
 604         opt.tweak = show_setup_revisions_tweak;
 605         cmd_log_init(argc, argv, prefix, &rev, &opt);
 606
 607         if (!rev.no_walk)
 608                 return cmd_log_walk(&rev);
 609
 610         count = rev.pending.nr;
 611         objects = rev.pending.objects;
 612         for (i = 0; i < count && !ret; i++) {
 613                 struct object *o = objects[i].item;
 614                 const char *name = objects[i].name;
 615                 switch (o->type) {
 616                 case OBJ_BLOB:
 617                         ret = show_blob_object(&o->oid, &rev, name);
 618                         break;
 619                 case OBJ_TAG: {
 620                         struct tag *t = (struct tag *)o;
 621
 622                         if (rev.shown_one)
 623                                 putchar('\n');
 624                         fprintf(rev.diffopt.file, "%stag %s%s\n",
 625                                         diff_get_color_opt(&rev.diffopt, DIFF_COMMIT),
 626                                         t->tag,
 627                                         diff_get_color_opt(&rev.diffopt, DIFF_RESET));
 628                         ret = show_tag_object(&o->oid, &rev);
 629                         rev.shown_one = 1;
 630                         if (ret)
 631                                 break;
 632                         o = parse_object(the_repository, &t->tagged->oid);
 633                         if (!o)
 634                                 ret = error(_("Could not read object %s"),
 635                                             oid_to_hex(&t->tagged->oid));
 636                         objects[i].item = o;
 637                         i--;
 638                         break;
 639                 }
 640                 case OBJ_TREE:
 641                         if (rev.shown_one)
 642                                 putchar('\n');
 643                         fprintf(rev.diffopt.file, "%stree %s%s\n\n",
 644                                         diff_get_color_opt(&rev.diffopt, DIFF_COMMIT),
 645                                         name,
 646                                         diff_get_color_opt(&rev.diffopt, DIFF_RESET));
 647                         read_tree_recursive(the_repository, (struct tree *)o, "",
 648                                             0, 0, &match_all, show_tree_object,
 649                                             rev.diffopt.file);
 650                         rev.shown_one = 1;
 651                         break;
 652                 case OBJ_COMMIT:
 653                         rev.pending.nr = rev.pending.alloc = 0;
 654                         rev.pending.objects = NULL;
 655                         add_object_array(o, name, &rev.pending);
 656                         ret = cmd_log_walk(&rev);
 657                         break;
 658                 default:
 659                         ret = error(_("Unknown type: %d"), o->type);
 660                 }
 661         }
 662         free(objects);
 663         return ret;
 664 }
 665
 666 /*
 667  * This is equivalent to "git log -g --abbrev-commit --pretty=oneline"
 668  */
 669 int cmd_log_reflog(int argc, const char **argv, const char *prefix)
 670 {
 671         struct rev_info rev;
 672         struct setup_revision_opt opt;
 673
 674         init_log_defaults();
 675         git_config(git_log_config, NULL);
 676
 677         repo_init_revisions(the_repository, &rev, prefix);
 678         init_reflog_walk(&rev.reflog_info);
 679         rev.verbose_header = 1;
 680         memset(&opt, 0, sizeof(opt));
 681         opt.def = "HEAD";
 682         cmd_log_init_defaults(&rev);
 683         rev.abbrev_commit = 1;
 684         rev.commit_format = CMIT_FMT_ONELINE;
 685         rev.use_terminator = 1;
 686         rev.always_show_header = 1;
 687         cmd_log_init_finish(argc, argv, prefix, &rev, &opt);
 688
 689         return cmd_log_walk(&rev);
 690 }
 691
 692 static void log_setup_revisions_tweak(struct rev_info *rev,
 693                                       struct setup_revision_opt *opt)
 694 {
 695         if (rev->diffopt.flags.default_follow_renames &&
 696             rev->prune_data.nr == 1)
 697                 rev->diffopt.flags.follow_renames = 1;
 698
 699         /* Turn --cc/-c into -p --cc/-c when -p was not given */
 700         if (!rev->diffopt.output_format && rev->combine_merges)
 701                 rev->diffopt.output_format = DIFF_FORMAT_PATCH;
 702
 703         /* Turn -m on when --cc/-c was given */
 704         if (rev->combine_merges)
 705                 rev->ignore_merges = 0;
 706 }
 707
 708 int cmd_log(int argc, const char **argv, const char *prefix)
 709 {
 710         struct rev_info rev;
 711         struct setup_revision_opt opt;
 712
 713         init_log_defaults();
 714         git_config(git_log_config, NULL);
 715
 716         repo_init_revisions(the_repository, &rev, prefix);
 717         rev.always_show_header = 1;
 718         memset(&opt, 0, sizeof(opt));
 719         opt.def = "HEAD";
 720         opt.revarg_opt = REVARG_COMMITTISH;
 721         opt.tweak = log_setup_revisions_tweak;
 722         cmd_log_init(argc, argv, prefix, &rev, &opt);
 723         return cmd_log_walk(&rev);
 724 }
 725
 726 /* format-patch */
 727
 728 static const char *fmt_patch_suffix = ".patch";
 729 static int numbered = 0;
 730 static int auto_number = 1;
 731
 732 static char *default_attach = NULL;
 733
 734 static struct string_list extra_hdr = STRING_LIST_INIT_NODUP;
 735 static struct string_list extra_to = STRING_LIST_INIT_NODUP;
 736 static struct string_list extra_cc = STRING_LIST_INIT_NODUP;
 737
 738 static void add_header(const char *value)
 739 {
 740         struct string_list_item *item;
 741         int len = strlen(value);
 742         while (len && value[len - 1] == '\n')
 743                 len--;
 744
 745         if (!strncasecmp(value, "to: ", 4)) {
 746                 item = string_list_append(&extra_to, value + 4);
 747                 len -= 4;
 748         } else if (!strncasecmp(value, "cc: ", 4)) {
 749                 item = string_list_append(&extra_cc, value + 4);
 750                 len -= 4;
 751         } else {
 752                 item = string_list_append(&extra_hdr, value);
 753         }
 754
 755         item->string[len] = '\0';
 756 }
 757
 758 #define THREAD_SHALLOW 1
 759 #define THREAD_DEEP 2
 760 static int thread;
 761 static int do_signoff;
 762 static int base_auto;
 763 static char *from;
 764 static const char *signature = git_version_string;
 765 static const char *signature_file;
 766 static int config_cover_letter;
 767 static const char *config_output_directory;
 768
 769 enum {
 770         COVER_UNSET,
 771         COVER_OFF,
 772         COVER_ON,
 773         COVER_AUTO
 774 };
 775
 776 static int git_format_config(const char *var, const char *value, void *cb)
 777 {
 778         if (!strcmp(var, "format.headers")) {
 779                 if (!value)
 780                         die(_("format.headers without value"));
 781                 add_header(value);
 782                 return 0;
 783         }
 784         if (!strcmp(var, "format.suffix"))
 785                 return git_config_string(&fmt_patch_suffix, var, value);
 786         if (!strcmp(var, "format.to")) {
 787                 if (!value)
 788                         return config_error_nonbool(var);
 789                 string_list_append(&extra_to, value);
 790                 return 0;
 791         }
 792         if (!strcmp(var, "format.cc")) {
 793                 if (!value)
 794                         return config_error_nonbool(var);
 795                 string_list_append(&extra_cc, value);
 796                 return 0;
 797         }
 798         if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff") ||
 799             !strcmp(var, "color.ui") || !strcmp(var, "diff.submodule")) {
 800                 return 0;
 801         }
 802         if (!strcmp(var, "format.numbered")) {
 803                 if (value && !strcasecmp(value, "auto")) {
 804                         auto_number = 1;
 805                         return 0;
 806                 }
 807                 numbered = git_config_bool(var, value);
 808                 auto_number = auto_number && numbered;
 809                 return 0;
 810         }
 811         if (!strcmp(var, "format.attach")) {
 812                 if (value && *value)
 813                         default_attach = xstrdup(value);
 814                 else
 815                         default_attach = xstrdup(git_version_string);
 816                 return 0;
 817         }
 818         if (!strcmp(var, "format.thread")) {
 819                 if (value && !strcasecmp(value, "deep")) {
 820                         thread = THREAD_DEEP;
 821                         return 0;
 822                 }
 823                 if (value && !strcasecmp(value, "shallow")) {
 824                         thread = THREAD_SHALLOW;
 825                         return 0;
 826                 }
 827                 thread = git_config_bool(var, value) && THREAD_SHALLOW;
 828                 return 0;
 829         }
 830         if (!strcmp(var, "format.signoff")) {
 831                 do_signoff = git_config_bool(var, value);
 832                 return 0;
 833         }
 834         if (!strcmp(var, "format.signature"))
 835                 return git_config_string(&signature, var, value);
 836         if (!strcmp(var, "format.signaturefile"))
 837                 return git_config_pathname(&signature_file, var, value);
 838         if (!strcmp(var, "format.coverletter")) {
 839                 if (value && !strcasecmp(value, "auto")) {
 840                         config_cover_letter = COVER_AUTO;
 841                         return 0;
 842                 }
 843                 config_cover_letter = git_config_bool(var, value) ? COVER_ON : COVER_OFF;
 844                 return 0;
 845         }
 846         if (!strcmp(var, "format.outputdirectory"))
 847                 return git_config_string(&config_output_directory, var, value);
 848         if (!strcmp(var, "format.useautobase")) {
 849                 base_auto = git_config_bool(var, value);
 850                 return 0;
 851         }
 852         if (!strcmp(var, "format.from")) {
 853                 int b = git_parse_maybe_bool(value);
 854                 free(from);
 855                 if (b < 0)
 856                         from = xstrdup(value);
 857                 else if (b)
 858                         from = xstrdup(git_committer_info(IDENT_NO_DATE));
 859                 else
 860                         from = NULL;
 861                 return 0;
 862         }
 863
 864         return git_log_config(var, value, cb);
 865 }
 866
 867 static const char *output_directory = NULL;
 868 static int outdir_offset;
 869
 870 static int open_next_file(struct commit *commit, const char *subject,
 871                          struct rev_info *rev, int quiet)
 872 {
 873         struct strbuf filename = STRBUF_INIT;
 874         int suffix_len = strlen(rev->patch_suffix) + 1;
 875
 876         if (output_directory) {
 877                 strbuf_addstr(&filename, output_directory);
 878                 if (filename.len >=
 879                     PATH_MAX - FORMAT_PATCH_NAME_MAX - suffix_len) {
 880                         strbuf_release(&filename);
 881                         return error(_("name of output directory is too long"));
 882                 }
 883                 strbuf_complete(&filename, '/');
 884         }
 885
 886         if (rev->numbered_files)
 887                 strbuf_addf(&filename, "%d", rev->nr);
 888         else if (commit)
 889                 fmt_output_commit(&filename, commit, rev);
 890         else
 891                 fmt_output_subject(&filename, subject, rev);
 892
 893         if (!quiet)
 894                 printf("%s\n", filename.buf + outdir_offset);
 895
 896         if ((rev->diffopt.file = fopen(filename.buf, "w")) == NULL) {
 897                 error_errno(_("Cannot open patch file %s"), filename.buf);
 898                 strbuf_release(&filename);
 899                 return -1;
 900         }
 901
 902         strbuf_release(&filename);
 903         return 0;
 904 }
 905
 906 static void get_patch_ids(struct rev_info *rev, struct patch_ids *ids)
 907 {
 908         struct rev_info check_rev;
 909         struct commit *commit, *c1, *c2;
 910         struct object *o1, *o2;
 911         unsigned flags1, flags2;
 912
 913         if (rev->pending.nr != 2)
 914                 die(_("Need exactly one range."));
 915
 916         o1 = rev->pending.objects[0].item;
 917         o2 = rev->pending.objects[1].item;
 918         flags1 = o1->flags;
 919         flags2 = o2->flags;
 920         c1 = lookup_commit_reference(the_repository, &o1->oid);
 921         c2 = lookup_commit_reference(the_repository, &o2->oid);
 922
 923         if ((flags1 & UNINTERESTING) == (flags2 & UNINTERESTING))
 924                 die(_("Not a range."));
 925
 926         init_patch_ids(the_repository, ids);
 927
 928         /* given a range a..b get all patch ids for b..a */
 929         repo_init_revisions(the_repository, &check_rev, rev->prefix);
 930         check_rev.max_parents = 1;
 931         o1->flags ^= UNINTERESTING;
 932         o2->flags ^= UNINTERESTING;
 933         add_pending_object(&check_rev, o1, "o1");
 934         add_pending_object(&check_rev, o2, "o2");
 935         if (prepare_revision_walk(&check_rev))
 936                 die(_("revision walk setup failed"));
 937
 938         while ((commit = get_revision(&check_rev)) != NULL) {
 939                 add_commit_patch_id(commit, ids);
 940         }
 941
 942         /* reset for next revision walk */
 943         clear_commit_marks(c1, SEEN | UNINTERESTING | SHOWN | ADDED);
 944         clear_commit_marks(c2, SEEN | UNINTERESTING | SHOWN | ADDED);
 945         o1->flags = flags1;
 946         o2->flags = flags2;
 947 }
 948
 949 static void gen_message_id(struct rev_info *info, char *base)
 950 {
 951         struct strbuf buf = STRBUF_INIT;
 952         strbuf_addf(&buf, "%s.%"PRItime".git.%s", base,
 953                     (timestamp_t) time(NULL),
 954                     git_committer_info(IDENT_NO_NAME|IDENT_NO_DATE|IDENT_STRICT));
 955         info->message_id = strbuf_detach(&buf, NULL);
 956 }
 957
 958 static void print_signature(FILE *file)
 959 {
 960         if (!signature || !*signature)
 961                 return;
 962
 963         fprintf(file, "-- \n%s", signature);
 964         if (signature[strlen(signature)-1] != '\n')
 965                 putc('\n', file);
 966         putc('\n', file);
 967 }
 968
 969 static void add_branch_description(struct strbuf *buf, const char *branch_name)
 970 {
 971         struct strbuf desc = STRBUF_INIT;
 972         if (!branch_name || !*branch_name)
 973                 return;
 974         read_branch_desc(&desc, branch_name);
 975         if (desc.len) {
 976                 strbuf_addch(buf, '\n');
 977                 strbuf_addbuf(buf, &desc);
 978                 strbuf_addch(buf, '\n');
 979         }
 980         strbuf_release(&desc);
 981 }
 982
 983 static char *find_branch_name(struct rev_info *rev)
 984 {
 985         int i, positive = -1;
 986         struct object_id branch_oid;
 987         const struct object_id *tip_oid;
 988         const char *ref, *v;
 989         char *full_ref, *branch = NULL;
 990
 991         for (i = 0; i < rev->cmdline.nr; i++) {
 992                 if (rev->cmdline.rev[i].flags & UNINTERESTING)
 993                         continue;
 994                 if (positive < 0)
 995                         positive = i;
 996                 else
 997                         return NULL;
 998         }
 999         if (positive < 0)
1000                 return NULL;
1001         ref = rev->cmdline.rev[positive].name;
1002         tip_oid = &rev->cmdline.rev[positive].item->oid;
1003         if (dwim_ref(ref, strlen(ref), &branch_oid, &full_ref) &&
1004             skip_prefix(full_ref, "refs/heads/", &v) &&
1005             oideq(tip_oid, &branch_oid))
1006                 branch = xstrdup(v);
1007         free(full_ref);
1008         return branch;
1009 }
1010
1011 static void show_diffstat(struct rev_info *rev,
1012                           struct commit *origin, struct commit *head)
1013 {
1014         struct diff_options opts;
1015
1016         memcpy(&opts, &rev->diffopt, sizeof(opts));
1017         opts.output_format = DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT;
1018         diff_setup_done(&opts);
1019
1020         diff_tree_oid(get_commit_tree_oid(origin),
1021                       get_commit_tree_oid(head),
1022                       "", &opts);
1023         diffcore_std(&opts);
1024         diff_flush(&opts);
1025
1026         fprintf(rev->diffopt.file, "\n");
1027 }
1028
1029 static void make_cover_letter(struct rev_info *rev, int use_stdout,
1030                               struct commit *origin,
1031                               int nr, struct commit **list,
1032                               const char *branch_name,
1033                               int quiet)
1034 {
1035         const char *committer;
1036         const char *body = "*** SUBJECT HERE ***\n\n*** BLURB HERE ***\n";
1037         const char *msg;
1038         struct shortlog log;
1039         struct strbuf sb = STRBUF_INIT;
1040         int i;
1041         const char *encoding = "UTF-8";
1042         int need_8bit_cte = 0;
1043         struct pretty_print_context pp = {0};
1044         struct commit *head = list[0];
1045
1046         if (!cmit_fmt_is_mail(rev->commit_format))
1047                 die(_("Cover letter needs email format"));
1048
1049         committer = git_committer_info(0);
1050
1051         if (!use_stdout &&
1052             open_next_file(NULL, rev->numbered_files ? NULL : "cover-letter", rev, quiet))
1053                 return;
1054
1055         log_write_email_headers(rev, head, &pp.after_subject, &need_8bit_cte, 0);
1056
1057         for (i = 0; !need_8bit_cte && i < nr; i++) {
1058                 const char *buf = get_commit_buffer(list[i], NULL);
1059                 if (has_non_ascii(buf))
1060                         need_8bit_cte = 1;
1061                 unuse_commit_buffer(list[i], buf);
1062         }
1063
1064         if (!branch_name)
1065                 branch_name = find_branch_name(rev);
1066
1067         msg = body;
1068         pp.fmt = CMIT_FMT_EMAIL;
1069         pp.date_mode.type = DATE_RFC2822;
1070         pp.rev = rev;
1071         pp.print_email_subject = 1;
1072         pp_user_info(&pp, NULL, &sb, committer, encoding);
1073         pp_title_line(&pp, &msg, &sb, encoding, need_8bit_cte);
1074         pp_remainder(&pp, &msg, &sb, 0);
1075         add_branch_description(&sb, branch_name);
1076         fprintf(rev->diffopt.file, "%s\n", sb.buf);
1077
1078         strbuf_release(&sb);
1079
1080         shortlog_init(&log);
1081         log.wrap_lines = 1;
1082         log.wrap = MAIL_DEFAULT_WRAP;
1083         log.in1 = 2;
1084         log.in2 = 4;
1085         log.file = rev->diffopt.file;
1086         for (i = 0; i < nr; i++)
1087                 shortlog_add_commit(&log, list[i]);
1088
1089         shortlog_output(&log);
1090
1091         /* We can only do diffstat with a unique reference point */
1092         if (origin)
1093                 show_diffstat(rev, origin, head);
1094
1095         if (rev->idiff_oid1) {
1096                 fprintf_ln(rev->diffopt.file, "%s", rev->idiff_title);
1097                 show_interdiff(rev, 0);
1098         }
1099
1100         if (rev->rdiff1) {
1101                 /*
1102                  * Pass minimum required diff-options to range-diff; others
1103                  * can be added later if deemed desirable.
1104                  */
1105                 struct diff_options opts;
1106                 diff_setup(&opts);
1107                 opts.file = rev->diffopt.file;
1108                 opts.use_color = rev->diffopt.use_color;
1109                 diff_setup_done(&opts);
1110                 fprintf_ln(rev->diffopt.file, "%s", rev->rdiff_title);
1111                 show_range_diff(rev->rdiff1, rev->rdiff2,
1112                                 rev->creation_factor, 1, &opts);
1113         }
1114 }
1115
1116 static const char *clean_message_id(const char *msg_id)
1117 {
1118         char ch;
1119         const char *a, *z, *m;
1120
1121         m = msg_id;
1122         while ((ch = *m) && (isspace(ch) || (ch == '<')))
1123                 m++;
1124         a = m;
1125         z = NULL;
1126         while ((ch = *m)) {
1127                 if (!isspace(ch) && (ch != '>'))
1128                         z = m;
1129                 m++;
1130         }
1131         if (!z)
1132                 die(_("insane in-reply-to: %s"), msg_id);
1133         if (++z == m)
1134                 return a;
1135         return xmemdupz(a, z - a);
1136 }
1137
1138 static const char *set_outdir(const char *prefix, const char *output_directory)
1139 {
1140         if (output_directory && is_absolute_path(output_directory))
1141                 return output_directory;
1142
1143         if (!prefix || !*prefix) {
1144                 if (output_directory)
1145                         return output_directory;
1146                 /* The user did not explicitly ask for "./" */
1147                 outdir_offset = 2;
1148                 return "./";
1149         }
1150
1151         outdir_offset = strlen(prefix);
1152         if (!output_directory)
1153                 return prefix;
1154
1155         return prefix_filename(prefix, output_directory);
1156 }
1157
1158 static const char * const builtin_format_patch_usage[] = {
1159         N_("git format-patch [<options>] [<since> | <revision-range>]"),
1160         NULL
1161 };
1162
1163 static int keep_subject = 0;
1164
1165 static int keep_callback(const struct option *opt, const char *arg, int unset)
1166 {
1167         BUG_ON_OPT_NEG(unset);
1168         BUG_ON_OPT_ARG(arg);
1169         ((struct rev_info *)opt->value)->total = -1;
1170         keep_subject = 1;
1171         return 0;
1172 }
1173
1174 static int subject_prefix = 0;
1175
1176 static int subject_prefix_callback(const struct option *opt, const char *arg,
1177                             int unset)
1178 {
1179         BUG_ON_OPT_NEG(unset);
1180         subject_prefix = 1;
1181         ((struct rev_info *)opt->value)->subject_prefix = arg;
1182         return 0;
1183 }
1184
1185 static int rfc_callback(const struct option *opt, const char *arg, int unset)
1186 {
1187         BUG_ON_OPT_NEG(unset);
1188         BUG_ON_OPT_ARG(arg);
1189         return subject_prefix_callback(opt, "RFC PATCH", unset);
1190 }
1191
1192 static int numbered_cmdline_opt = 0;
1193
1194 static int numbered_callback(const struct option *opt, const char *arg,
1195                              int unset)
1196 {
1197         BUG_ON_OPT_ARG(arg);
1198         *(int *)opt->value = numbered_cmdline_opt = unset ? 0 : 1;
1199         if (unset)
1200                 auto_number =  0;
1201         return 0;
1202 }
1203
1204 static int no_numbered_callback(const struct option *opt, const char *arg,
1205                                 int unset)
1206 {
1207         BUG_ON_OPT_NEG(unset);
1208         return numbered_callback(opt, arg, 1);
1209 }
1210
1211 static int output_directory_callback(const struct option *opt, const char *arg,
1212                               int unset)
1213 {
1214         const char **dir = (const char **)opt->value;
1215         BUG_ON_OPT_NEG(unset);
1216         if (*dir)
1217                 die(_("Two output directories?"));
1218         *dir = arg;
1219         return 0;
1220 }
1221
1222 static int thread_callback(const struct option *opt, const char *arg, int unset)
1223 {
1224         int *thread = (int *)opt->value;
1225         if (unset)
1226                 *thread = 0;
1227         else if (!arg || !strcmp(arg, "shallow"))
1228                 *thread = THREAD_SHALLOW;
1229         else if (!strcmp(arg, "deep"))
1230                 *thread = THREAD_DEEP;
1231         else
1232                 return 1;
1233         return 0;
1234 }
1235
1236 static int attach_callback(const struct option *opt, const char *arg, int unset)
1237 {
1238         struct rev_info *rev = (struct rev_info *)opt->value;
1239         if (unset)
1240                 rev->mime_boundary = NULL;
1241         else if (arg)
1242                 rev->mime_boundary = arg;
1243         else
1244                 rev->mime_boundary = git_version_string;
1245         rev->no_inline = unset ? 0 : 1;
1246         return 0;
1247 }
1248
1249 static int inline_callback(const struct option *opt, const char *arg, int unset)
1250 {
1251         struct rev_info *rev = (struct rev_info *)opt->value;
1252         if (unset)
1253                 rev->mime_boundary = NULL;
1254         else if (arg)
1255                 rev->mime_boundary = arg;
1256         else
1257                 rev->mime_boundary = git_version_string;
1258         rev->no_inline = 0;
1259         return 0;
1260 }
1261
1262 static int header_callback(const struct option *opt, const char *arg, int unset)
1263 {
1264         if (unset) {
1265                 string_list_clear(&extra_hdr, 0);
1266                 string_list_clear(&extra_to, 0);
1267                 string_list_clear(&extra_cc, 0);
1268         } else {
1269             add_header(arg);
1270         }
1271         return 0;
1272 }
1273
1274 static int to_callback(const struct option *opt, const char *arg, int unset)
1275 {
1276         if (unset)
1277                 string_list_clear(&extra_to, 0);
1278         else
1279                 string_list_append(&extra_to, arg);
1280         return 0;
1281 }
1282
1283 static int cc_callback(const struct option *opt, const char *arg, int unset)
1284 {
1285         if (unset)
1286                 string_list_clear(&extra_cc, 0);
1287         else
1288                 string_list_append(&extra_cc, arg);
1289         return 0;
1290 }
1291
1292 static int from_callback(const struct option *opt, const char *arg, int unset)
1293 {
1294         char **from = opt->value;
1295
1296         free(*from);
1297
1298         if (unset)
1299                 *from = NULL;
1300         else if (arg)
1301                 *from = xstrdup(arg);
1302         else
1303                 *from = xstrdup(git_committer_info(IDENT_NO_DATE));
1304         return 0;
1305 }
1306
1307 struct base_tree_info {
1308         struct object_id base_commit;
1309         int nr_patch_id, alloc_patch_id;
1310         struct object_id *patch_id;
1311 };
1312
1313 static struct commit *get_base_commit(const char *base_commit,
1314                                       struct commit **list,
1315                                       int total)
1316 {
1317         struct commit *base = NULL;
1318         struct commit **rev;
1319         int i = 0, rev_nr = 0;
1320
1321         if (base_commit && strcmp(base_commit, "auto")) {
1322                 base = lookup_commit_reference_by_name(base_commit);
1323                 if (!base)
1324                         die(_("Unknown commit %s"), base_commit);
1325         } else if ((base_commit && !strcmp(base_commit, "auto")) || base_auto) {
1326                 struct branch *curr_branch = branch_get(NULL);
1327                 const char *upstream = branch_get_upstream(curr_branch, NULL);
1328                 if (upstream) {
1329                         struct commit_list *base_list;
1330                         struct commit *commit;
1331                         struct object_id oid;
1332
1333                         if (get_oid(upstream, &oid))
1334                                 die(_("Failed to resolve '%s' as a valid ref."), upstream);
1335                         commit = lookup_commit_or_die(&oid, "upstream base");
1336                         base_list = get_merge_bases_many(commit, total, list);
1337                         /* There should be one and only one merge base. */
1338                         if (!base_list || base_list->next)
1339                                 die(_("Could not find exact merge base."));
1340                         base = base_list->item;
1341                         free_commit_list(base_list);
1342                 } else {
1343                         die(_("Failed to get upstream, if you want to record base commit automatically,\n"
1344                               "please use git branch --set-upstream-to to track a remote branch.\n"
1345                               "Or you could specify base commit by --base=<base-commit-id> manually."));
1346                 }
1347         }
1348
1349         ALLOC_ARRAY(rev, total);
1350         for (i = 0; i < total; i++)
1351                 rev[i] = list[i];
1352
1353         rev_nr = total;
1354         /*
1355          * Get merge base through pair-wise computations
1356          * and store it in rev[0].
1357          */
1358         while (rev_nr > 1) {
1359                 for (i = 0; i < rev_nr / 2; i++) {
1360                         struct commit_list *merge_base;
1361                         merge_base = get_merge_bases(rev[2 * i], rev[2 * i + 1]);
1362                         if (!merge_base || merge_base->next)
1363                                 die(_("Failed to find exact merge base"));
1364
1365                         rev[i] = merge_base->item;
1366                 }
1367
1368                 if (rev_nr % 2)
1369                         rev[i] = rev[2 * i];
1370                 rev_nr = DIV_ROUND_UP(rev_nr, 2);
1371         }
1372
1373         if (!in_merge_bases(base, rev[0]))
1374                 die(_("base commit should be the ancestor of revision list"));
1375
1376         for (i = 0; i < total; i++) {
1377                 if (base == list[i])
1378                         die(_("base commit shouldn't be in revision list"));
1379         }
1380
1381         free(rev);
1382         return base;
1383 }
1384
1385 define_commit_slab(commit_base, int);
1386
1387 static void prepare_bases(struct base_tree_info *bases,
1388                           struct commit *base,
1389                           struct commit **list,
1390                           int total)
1391 {
1392         struct commit *commit;
1393         struct rev_info revs;
1394         struct diff_options diffopt;
1395         struct commit_base commit_base;
1396         int i;
1397
1398         if (!base)
1399                 return;
1400
1401         init_commit_base(&commit_base);
1402         repo_diff_setup(the_repository, &diffopt);
1403         diffopt.flags.recursive = 1;
1404         diff_setup_done(&diffopt);
1405
1406         oidcpy(&bases->base_commit, &base->object.oid);
1407
1408         repo_init_revisions(the_repository, &revs, NULL);
1409         revs.max_parents = 1;
1410         revs.topo_order = 1;
1411         for (i = 0; i < total; i++) {
1412                 list[i]->object.flags &= ~UNINTERESTING;
1413                 add_pending_object(&revs, &list[i]->object, "rev_list");
1414                 *commit_base_at(&commit_base, list[i]) = 1;
1415         }
1416         base->object.flags |= UNINTERESTING;
1417         add_pending_object(&revs, &base->object, "base");
1418
1419         if (prepare_revision_walk(&revs))
1420                 die(_("revision walk setup failed"));
1421         /*
1422          * Traverse the commits list, get prerequisite patch ids
1423          * and stuff them in bases structure.
1424          */
1425         while ((commit = get_revision(&revs)) != NULL) {
1426                 struct object_id oid;
1427                 struct object_id *patch_id;
1428                 if (*commit_base_at(&commit_base, commit))
1429                         continue;
1430                 if (commit_patch_id(commit, &diffopt, &oid, 0))
1431                         die(_("cannot get patch id"));
1432                 ALLOC_GROW(bases->patch_id, bases->nr_patch_id + 1, bases->alloc_patch_id);
1433                 patch_id = bases->patch_id + bases->nr_patch_id;
1434                 oidcpy(patch_id, &oid);
1435                 bases->nr_patch_id++;
1436         }
1437         clear_commit_base(&commit_base);
1438 }
1439
1440 static void print_bases(struct base_tree_info *bases, FILE *file)
1441 {
1442         int i;
1443
1444         /* Only do this once, either for the cover or for the first one */
1445         if (is_null_oid(&bases->base_commit))
1446                 return;
1447
1448         /* Show the base commit */
1449         fprintf(file, "\nbase-commit: %s\n", oid_to_hex(&bases->base_commit));
1450
1451         /* Show the prerequisite patches */
1452         for (i = bases->nr_patch_id - 1; i >= 0; i--)
1453                 fprintf(file, "prerequisite-patch-id: %s\n", oid_to_hex(&bases->patch_id[i]));
1454
1455         free(bases->patch_id);
1456         bases->nr_patch_id = 0;
1457         bases->alloc_patch_id = 0;
1458         oidclr(&bases->base_commit);
1459 }
1460
1461 static const char *diff_title(struct strbuf *sb, int reroll_count,
1462                        const char *generic, const char *rerolled)
1463 {
1464         if (reroll_count <= 0)
1465                 strbuf_addstr(sb, generic);
1466         else /* RFC may be v0, so allow -v1 to diff against v0 */
1467                 strbuf_addf(sb, rerolled, reroll_count - 1);
1468         return sb->buf;
1469 }
1470
1471 static void infer_range_diff_ranges(struct strbuf *r1,
1472                                     struct strbuf *r2,
1473                                     const char *prev,
1474                                     struct commit *origin,
1475                                     struct commit *head)
1476 {
1477         const char *head_oid = oid_to_hex(&head->object.oid);
1478
1479         if (!strstr(prev, "..")) {
1480                 strbuf_addf(r1, "%s..%s", head_oid, prev);
1481                 strbuf_addf(r2, "%s..%s", prev, head_oid);
1482         } else if (!origin) {
1483                 die(_("failed to infer range-diff ranges"));
1484         } else {
1485                 strbuf_addstr(r1, prev);
1486                 strbuf_addf(r2, "%s..%s",
1487                             oid_to_hex(&origin->object.oid), head_oid);
1488         }
1489 }
1490
1491 int cmd_format_patch(int argc, const char **argv, const char *prefix)
1492 {
1493         struct commit *commit;
1494         struct commit **list = NULL;
1495         struct rev_info rev;
1496         struct setup_revision_opt s_r_opt;
1497         int nr = 0, total, i;
1498         int use_stdout = 0;
1499         int start_number = -1;
1500         int just_numbers = 0;
1501         int ignore_if_in_upstream = 0;
1502         int cover_letter = -1;
1503         int boundary_count = 0;
1504         int no_binary_diff = 0;
1505         int zero_commit = 0;
1506         struct commit *origin = NULL;
1507         const char *in_reply_to = NULL;
1508         struct patch_ids ids;
1509         struct strbuf buf = STRBUF_INIT;
1510         int use_patch_format = 0;
1511         int quiet = 0;
1512         int reroll_count = -1;
1513         char *branch_name = NULL;
1514         char *base_commit = NULL;
1515         struct base_tree_info bases;
1516         int show_progress = 0;
1517         struct progress *progress = NULL;
1518         struct oid_array idiff_prev = OID_ARRAY_INIT;
1519         struct strbuf idiff_title = STRBUF_INIT;
1520         const char *rdiff_prev = NULL;
1521         struct strbuf rdiff1 = STRBUF_INIT;
1522         struct strbuf rdiff2 = STRBUF_INIT;
1523         struct strbuf rdiff_title = STRBUF_INIT;
1524         int creation_factor = -1;
1525
1526         const struct option builtin_format_patch_options[] = {
1527                 { OPTION_CALLBACK, 'n', "numbered", &numbered, NULL,
1528                             N_("use [PATCH n/m] even with a single patch"),
1529                             PARSE_OPT_NOARG, numbered_callback },
1530                 { OPTION_CALLBACK, 'N', "no-numbered", &numbered, NULL,
1531                             N_("use [PATCH] even with multiple patches"),
1532                             PARSE_OPT_NOARG | PARSE_OPT_NONEG, no_numbered_callback },
1533                 OPT_BOOL('s', "signoff", &do_signoff, N_("add Signed-off-by:")),
1534                 OPT_BOOL(0, "stdout", &use_stdout,
1535                             N_("print patches to standard out")),
1536                 OPT_BOOL(0, "cover-letter", &cover_letter,
1537                             N_("generate a cover letter")),
1538                 OPT_BOOL(0, "numbered-files", &just_numbers,
1539                             N_("use simple number sequence for output file names")),
1540                 OPT_STRING(0, "suffix", &fmt_patch_suffix, N_("sfx"),
1541                             N_("use <sfx> instead of '.patch'")),
1542                 OPT_INTEGER(0, "start-number", &start_number,
1543                             N_("start numbering patches at <n> instead of 1")),
1544                 OPT_INTEGER('v', "reroll-count", &reroll_count,
1545                             N_("mark the series as Nth re-roll")),
1546                 { OPTION_CALLBACK, 0, "rfc", &rev, NULL,
1547                             N_("Use [RFC PATCH] instead of [PATCH]"),
1548                             PARSE_OPT_NOARG | PARSE_OPT_NONEG, rfc_callback },
1549                 { OPTION_CALLBACK, 0, "subject-prefix", &rev, N_("prefix"),
1550                             N_("Use [<prefix>] instead of [PATCH]"),
1551                             PARSE_OPT_NONEG, subject_prefix_callback },
1552                 { OPTION_CALLBACK, 'o', "output-directory", &output_directory,
1553                             N_("dir"), N_("store resulting files in <dir>"),
1554                             PARSE_OPT_NONEG, output_directory_callback },
1555                 { OPTION_CALLBACK, 'k', "keep-subject", &rev, NULL,
1556                             N_("don't strip/add [PATCH]"),
1557                             PARSE_OPT_NOARG | PARSE_OPT_NONEG, keep_callback },
1558                 OPT_BOOL(0, "no-binary", &no_binary_diff,
1559                          N_("don't output binary diffs")),
1560                 OPT_BOOL(0, "zero-commit", &zero_commit,
1561                          N_("output all-zero hash in From header")),
1562                 OPT_BOOL(0, "ignore-if-in-upstream", &ignore_if_in_upstream,
1563                          N_("don't include a patch matching a commit upstream")),
1564                 OPT_SET_INT_F('p', "no-stat", &use_patch_format,
1565                               N_("show patch format instead of default (patch + stat)"),
1566                               1, PARSE_OPT_NONEG),
1567                 OPT_GROUP(N_("Messaging")),
1568                 { OPTION_CALLBACK, 0, "add-header", NULL, N_("header"),
1569                             N_("add email header"), 0, header_callback },
1570                 { OPTION_CALLBACK, 0, "to", NULL, N_("email"), N_("add To: header"),
1571                             0, to_callback },
1572                 { OPTION_CALLBACK, 0, "cc", NULL, N_("email"), N_("add Cc: header"),
1573                             0, cc_callback },
1574                 { OPTION_CALLBACK, 0, "from", &from, N_("ident"),
1575                             N_("set From address to <ident> (or committer ident if absent)"),
1576                             PARSE_OPT_OPTARG, from_callback },
1577                 OPT_STRING(0, "in-reply-to", &in_reply_to, N_("message-id"),
1578                             N_("make first mail a reply to <message-id>")),
1579                 { OPTION_CALLBACK, 0, "attach", &rev, N_("boundary"),
1580                             N_("attach the patch"), PARSE_OPT_OPTARG,
1581                             attach_callback },
1582                 { OPTION_CALLBACK, 0, "inline", &rev, N_("boundary"),
1583                             N_("inline the patch"),
1584                             PARSE_OPT_OPTARG | PARSE_OPT_NONEG,
1585                             inline_callback },
1586                 { OPTION_CALLBACK, 0, "thread", &thread, N_("style"),
1587                             N_("enable message threading, styles: shallow, deep"),
1588                             PARSE_OPT_OPTARG, thread_callback },
1589                 OPT_STRING(0, "signature", &signature, N_("signature"),
1590                             N_("add a signature")),
1591                 OPT_STRING(0, "base", &base_commit, N_("base-commit"),
1592                            N_("add prerequisite tree info to the patch series")),
1593                 OPT_FILENAME(0, "signature-file", &signature_file,
1594                                 N_("add a signature from a file")),
1595                 OPT__QUIET(&quiet, N_("don't print the patch filenames")),
1596                 OPT_BOOL(0, "progress", &show_progress,
1597                          N_("show progress while generating patches")),
1598                 OPT_CALLBACK(0, "interdiff", &idiff_prev, N_("rev"),
1599                              N_("show changes against <rev> in cover letter or single patch"),
1600                              parse_opt_object_name),
1601                 OPT_STRING(0, "range-diff", &rdiff_prev, N_("refspec"),
1602                            N_("show changes against <refspec> in cover letter or single patch")),
1603                 OPT_INTEGER(0, "creation-factor", &creation_factor,
1604                             N_("percentage by which creation is weighted")),
1605                 OPT_END()
1606         };
1607
1608         extra_hdr.strdup_strings = 1;
1609         extra_to.strdup_strings = 1;
1610         extra_cc.strdup_strings = 1;
1611         init_log_defaults();
1612         git_config(git_format_config, NULL);
1613         repo_init_revisions(the_repository, &rev, prefix);
1614         rev.commit_format = CMIT_FMT_EMAIL;
1615         rev.expand_tabs_in_log_default = 0;
1616         rev.verbose_header = 1;
1617         rev.diff = 1;
1618         rev.max_parents = 1;
1619         rev.diffopt.flags.recursive = 1;
1620         rev.subject_prefix = fmt_patch_subject_prefix;
1621         memset(&s_r_opt, 0, sizeof(s_r_opt));
1622         s_r_opt.def = "HEAD";
1623         s_r_opt.revarg_opt = REVARG_COMMITTISH;
1624
1625         if (default_attach) {
1626                 rev.mime_boundary = default_attach;
1627                 rev.no_inline = 1;
1628         }
1629
1630         /*
1631          * Parse the arguments before setup_revisions(), or something
1632          * like "git format-patch -o a123 HEAD^.." may fail; a123 is
1633          * possibly a valid SHA1.
1634          */
1635         argc = parse_options(argc, argv, prefix, builtin_format_patch_options,
1636                              builtin_format_patch_usage,
1637                              PARSE_OPT_KEEP_ARGV0 | PARSE_OPT_KEEP_UNKNOWN |
1638                              PARSE_OPT_KEEP_DASHDASH);
1639
1640         if (0 < reroll_count) {
1641                 struct strbuf sprefix = STRBUF_INIT;
1642                 strbuf_addf(&sprefix, "%s v%d",
1643                             rev.subject_prefix, reroll_count);
1644                 rev.reroll_count = reroll_count;
1645                 rev.subject_prefix = strbuf_detach(&sprefix, NULL);
1646         }
1647
1648         for (i = 0; i < extra_hdr.nr; i++) {
1649                 strbuf_addstr(&buf, extra_hdr.items[i].string);
1650                 strbuf_addch(&buf, '\n');
1651         }
1652
1653         if (extra_to.nr)
1654                 strbuf_addstr(&buf, "To: ");
1655         for (i = 0; i < extra_to.nr; i++) {
1656                 if (i)
1657                         strbuf_addstr(&buf, "    ");
1658                 strbuf_addstr(&buf, extra_to.items[i].string);
1659                 if (i + 1 < extra_to.nr)
1660                         strbuf_addch(&buf, ',');
1661                 strbuf_addch(&buf, '\n');
1662         }
1663
1664         if (extra_cc.nr)
1665                 strbuf_addstr(&buf, "Cc: ");
1666         for (i = 0; i < extra_cc.nr; i++) {
1667                 if (i)
1668                         strbuf_addstr(&buf, "    ");
1669                 strbuf_addstr(&buf, extra_cc.items[i].string);
1670                 if (i + 1 < extra_cc.nr)
1671                         strbuf_addch(&buf, ',');
1672                 strbuf_addch(&buf, '\n');
1673         }
1674
1675         rev.extra_headers = strbuf_detach(&buf, NULL);
1676
1677         if (from) {
1678                 if (split_ident_line(&rev.from_ident, from, strlen(from)))
1679                         die(_("invalid ident line: %s"), from);
1680         }
1681
1682         if (start_number < 0)
1683                 start_number = 1;
1684
1685         /*
1686          * If numbered is set solely due to format.numbered in config,
1687          * and it would conflict with --keep-subject (-k) from the
1688          * command line, reset "numbered".
1689          */
1690         if (numbered && keep_subject && !numbered_cmdline_opt)
1691                 numbered = 0;
1692
1693         if (numbered && keep_subject)
1694                 die(_("-n and -k are mutually exclusive"));
1695         if (keep_subject && subject_prefix)
1696                 die(_("--subject-prefix/--rfc and -k are mutually exclusive"));
1697         rev.preserve_subject = keep_subject;
1698
1699         argc = setup_revisions(argc, argv, &rev, &s_r_opt);
1700         if (argc > 1)
1701                 die(_("unrecognized argument: %s"), argv[1]);
1702
1703         if (rev.diffopt.output_format & DIFF_FORMAT_NAME)
1704                 die(_("--name-only does not make sense"));
1705         if (rev.diffopt.output_format & DIFF_FORMAT_NAME_STATUS)
1706                 die(_("--name-status does not make sense"));
1707         if (rev.diffopt.output_format & DIFF_FORMAT_CHECKDIFF)
1708                 die(_("--check does not make sense"));
1709
1710         if (!use_patch_format &&
1711                 (!rev.diffopt.output_format ||
1712                  rev.diffopt.output_format == DIFF_FORMAT_PATCH))
1713                 rev.diffopt.output_format = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_SUMMARY;
1714         if (!rev.diffopt.stat_width)
1715                 rev.diffopt.stat_width = MAIL_DEFAULT_WRAP;
1716
1717         /* Always generate a patch */
1718         rev.diffopt.output_format |= DIFF_FORMAT_PATCH;
1719
1720         rev.zero_commit = zero_commit;
1721
1722         if (!rev.diffopt.flags.text && !no_binary_diff)
1723                 rev.diffopt.flags.binary = 1;
1724
1725         if (rev.show_notes)
1726                 init_display_notes(&rev.notes_opt);
1727
1728         if (!output_directory && !use_stdout)
1729                 output_directory = config_output_directory;
1730
1731         if (!use_stdout)
1732                 output_directory = set_outdir(prefix, output_directory);
1733         else
1734                 setup_pager();
1735
1736         if (output_directory) {
1737                 if (rev.diffopt.use_color != GIT_COLOR_ALWAYS)
1738                         rev.diffopt.use_color = GIT_COLOR_NEVER;
1739                 if (use_stdout)
1740                         die(_("standard output, or directory, which one?"));
1741                 if (mkdir(output_directory, 0777) < 0 && errno != EEXIST)
1742                         die_errno(_("Could not create directory '%s'"),
1743                                   output_directory);
1744         }
1745
1746         if (rev.pending.nr == 1) {
1747                 int check_head = 0;
1748
1749                 if (rev.max_count < 0 && !rev.show_root_diff) {
1750                         /*
1751                          * This is traditional behaviour of "git format-patch
1752                          * origin" that prepares what the origin side still
1753                          * does not have.
1754                          */
1755                         rev.pending.objects[0].item->flags |= UNINTERESTING;
1756                         add_head_to_pending(&rev);
1757                         check_head = 1;
1758                 }
1759                 /*
1760                  * Otherwise, it is "format-patch -22 HEAD", and/or
1761                  * "format-patch --root HEAD".  The user wants
1762                  * get_revision() to do the usual traversal.
1763                  */
1764
1765                 if (!strcmp(rev.pending.objects[0].name, "HEAD"))
1766                         check_head = 1;
1767
1768                 if (check_head) {
1769                         const char *ref, *v;
1770                         ref = resolve_ref_unsafe("HEAD", RESOLVE_REF_READING,
1771                                                  NULL, NULL);
1772                         if (ref && skip_prefix(ref, "refs/heads/", &v))
1773                                 branch_name = xstrdup(v);
1774                         else
1775                                 branch_name = xstrdup(""); /* no branch */
1776                 }
1777         }
1778
1779         /*
1780          * We cannot move this anywhere earlier because we do want to
1781          * know if --root was given explicitly from the command line.
1782          */
1783         rev.show_root_diff = 1;
1784
1785         if (ignore_if_in_upstream) {
1786                 /* Don't say anything if head and upstream are the same. */
1787                 if (rev.pending.nr == 2) {
1788                         struct object_array_entry *o = rev.pending.objects;
1789                         if (oideq(&o[0].item->oid, &o[1].item->oid))
1790                                 goto done;
1791                 }
1792                 get_patch_ids(&rev, &ids);
1793         }
1794
1795         if (prepare_revision_walk(&rev))
1796                 die(_("revision walk setup failed"));
1797         rev.boundary = 1;
1798         while ((commit = get_revision(&rev)) != NULL) {
1799                 if (commit->object.flags & BOUNDARY) {
1800                         boundary_count++;
1801                         origin = (boundary_count == 1) ? commit : NULL;
1802                         continue;
1803                 }
1804
1805                 if (ignore_if_in_upstream && has_commit_patch_id(commit, &ids))
1806                         continue;
1807
1808                 nr++;
1809                 REALLOC_ARRAY(list, nr);
1810                 list[nr - 1] = commit;
1811         }
1812         if (nr == 0)
1813                 /* nothing to do */
1814                 goto done;
1815         total = nr;
1816         if (cover_letter == -1) {
1817                 if (config_cover_letter == COVER_AUTO)
1818                         cover_letter = (total > 1);
1819                 else
1820                         cover_letter = (config_cover_letter == COVER_ON);
1821         }
1822         if (!keep_subject && auto_number && (total > 1 || cover_letter))
1823                 numbered = 1;
1824         if (numbered)
1825                 rev.total = total + start_number - 1;
1826
1827         if (idiff_prev.nr) {
1828                 if (!cover_letter && total != 1)
1829                         die(_("--interdiff requires --cover-letter or single patch"));
1830                 rev.idiff_oid1 = &idiff_prev.oid[idiff_prev.nr - 1];
1831                 rev.idiff_oid2 = get_commit_tree_oid(list[0]);
1832                 rev.idiff_title = diff_title(&idiff_title, reroll_count,
1833                                              _("Interdiff:"),
1834                                              _("Interdiff against v%d:"));
1835         }
1836
1837         if (creation_factor < 0)
1838                 creation_factor = RANGE_DIFF_CREATION_FACTOR_DEFAULT;
1839         else if (!rdiff_prev)
1840                 die(_("--creation-factor requires --range-diff"));
1841
1842         if (rdiff_prev) {
1843                 if (!cover_letter && total != 1)
1844                         die(_("--range-diff requires --cover-letter or single patch"));
1845
1846                 infer_range_diff_ranges(&rdiff1, &rdiff2, rdiff_prev,
1847                                         origin, list[0]);
1848                 rev.rdiff1 = rdiff1.buf;
1849                 rev.rdiff2 = rdiff2.buf;
1850                 rev.creation_factor = creation_factor;
1851                 rev.rdiff_title = diff_title(&rdiff_title, reroll_count,
1852                                              _("Range-diff:"),
1853                                              _("Range-diff against v%d:"));
1854         }
1855
1856         if (!signature) {
1857                 ; /* --no-signature inhibits all signatures */
1858         } else if (signature && signature != git_version_string) {
1859                 ; /* non-default signature already set */
1860         } else if (signature_file) {
1861                 struct strbuf buf = STRBUF_INIT;
1862
1863                 if (strbuf_read_file(&buf, signature_file, 128) < 0)
1864                         die_errno(_("unable to read signature file '%s'"), signature_file);
1865                 signature = strbuf_detach(&buf, NULL);
1866         }
1867
1868         memset(&bases, 0, sizeof(bases));
1869         if (base_commit || base_auto) {
1870                 struct commit *base = get_base_commit(base_commit, list, nr);
1871                 reset_revision_walk();
1872                 clear_object_flags(UNINTERESTING);
1873                 prepare_bases(&bases, base, list, nr);
1874         }
1875
1876         if (in_reply_to || thread || cover_letter)
1877                 rev.ref_message_ids = xcalloc(1, sizeof(struct string_list));
1878         if (in_reply_to) {
1879                 const char *msgid = clean_message_id(in_reply_to);
1880                 string_list_append(rev.ref_message_ids, msgid);
1881         }
1882         rev.numbered_files = just_numbers;
1883         rev.patch_suffix = fmt_patch_suffix;
1884         if (cover_letter) {
1885                 if (thread)
1886                         gen_message_id(&rev, "cover");
1887                 make_cover_letter(&rev, use_stdout,
1888                                   origin, nr, list, branch_name, quiet);
1889                 print_bases(&bases, rev.diffopt.file);
1890                 print_signature(rev.diffopt.file);
1891                 total++;
1892                 start_number--;
1893                 /* interdiff/range-diff in cover-letter; omit from patches */
1894                 rev.idiff_oid1 = NULL;
1895                 rev.rdiff1 = NULL;
1896         }
1897         rev.add_signoff = do_signoff;
1898
1899         if (show_progress)
1900                 progress = start_delayed_progress(_("Generating patches"), total);
1901         while (0 <= --nr) {
1902                 int shown;
1903                 display_progress(progress, total - nr);
1904                 commit = list[nr];
1905                 rev.nr = total - nr + (start_number - 1);
1906                 /* Make the second and subsequent mails replies to the first */
1907                 if (thread) {
1908                         /* Have we already had a message ID? */
1909                         if (rev.message_id) {
1910                                 /*
1911                                  * For deep threading: make every mail
1912                                  * a reply to the previous one, no
1913                                  * matter what other options are set.
1914                                  *
1915                                  * For shallow threading:
1916                                  *
1917                                  * Without --cover-letter and
1918                                  * --in-reply-to, make every mail a
1919                                  * reply to the one before.
1920                                  *
1921                                  * With --in-reply-to but no
1922                                  * --cover-letter, make every mail a
1923                                  * reply to the <reply-to>.
1924                                  *
1925                                  * With --cover-letter, make every
1926                                  * mail but the cover letter a reply
1927                                  * to the cover letter.  The cover
1928                                  * letter is a reply to the
1929                                  * --in-reply-to, if specified.
1930                                  */
1931                                 if (thread == THREAD_SHALLOW
1932                                     && rev.ref_message_ids->nr > 0
1933                                     && (!cover_letter || rev.nr > 1))
1934                                         free(rev.message_id);
1935                                 else
1936                                         string_list_append(rev.ref_message_ids,
1937                                                            rev.message_id);
1938                         }
1939                         gen_message_id(&rev, oid_to_hex(&commit->object.oid));
1940                 }
1941
1942                 if (!use_stdout &&
1943                     open_next_file(rev.numbered_files ? NULL : commit, NULL, &rev, quiet))
1944                         die(_("Failed to create output files"));
1945                 shown = log_tree_commit(&rev, commit);
1946                 free_commit_buffer(the_repository->parsed_objects,
1947                                    commit);
1948
1949                 /* We put one extra blank line between formatted
1950                  * patches and this flag is used by log-tree code
1951                  * to see if it needs to emit a LF before showing
1952                  * the log; when using one file per patch, we do
1953                  * not want the extra blank line.
1954                  */
1955                 if (!use_stdout)
1956                         rev.shown_one = 0;
1957                 if (shown) {
1958                         print_bases(&bases, rev.diffopt.file);
1959                         if (rev.mime_boundary)
1960                                 fprintf(rev.diffopt.file, "\n--%s%s--\n\n\n",
1961                                        mime_boundary_leader,
1962                                        rev.mime_boundary);
1963                         else
1964                                 print_signature(rev.diffopt.file);
1965                 }
1966                 if (!use_stdout)
1967                         fclose(rev.diffopt.file);
1968         }
1969         stop_progress(&progress);
1970         free(list);
1971         free(branch_name);
1972         string_list_clear(&extra_to, 0);
1973         string_list_clear(&extra_cc, 0);
1974         string_list_clear(&extra_hdr, 0);
1975         if (ignore_if_in_upstream)
1976                 free_patch_ids(&ids);
1977
1978 done:
1979         oid_array_clear(&idiff_prev);
1980         strbuf_release(&idiff_title);
1981         strbuf_release(&rdiff1);
1982         strbuf_release(&rdiff2);
1983         strbuf_release(&rdiff_title);
1984         return 0;
1985 }
1986
1987 static int add_pending_commit(const char *arg, struct rev_info *revs, int flags)
1988 {
1989         struct object_id oid;
1990         if (get_oid(arg, &oid) == 0) {
1991                 struct commit *commit = lookup_commit_reference(the_repository,
1992                                                                 &oid);
1993                 if (commit) {
1994                         commit->object.flags |= flags;
1995                         add_pending_object(revs, &commit->object, arg);
1996                         return 0;
1997                 }
1998         }
1999         return -1;
2000 }
2001
2002 static const char * const cherry_usage[] = {
2003         N_("git cherry [-v] [<upstream> [<head> [<limit>]]]"),
2004         NULL
2005 };
2006
2007 static void print_commit(char sign, struct commit *commit, int verbose,
2008                          int abbrev, FILE *file)
2009 {
2010         if (!verbose) {
2011                 fprintf(file, "%c %s\n", sign,
2012                        find_unique_abbrev(&commit->object.oid, abbrev));
2013         } else {
2014                 struct strbuf buf = STRBUF_INIT;
2015                 pp_commit_easy(CMIT_FMT_ONELINE, commit, &buf);
2016                 fprintf(file, "%c %s %s\n", sign,
2017                        find_unique_abbrev(&commit->object.oid, abbrev),
2018                        buf.buf);
2019                 strbuf_release(&buf);
2020         }
2021 }
2022
2023 int cmd_cherry(int argc, const char **argv, const char *prefix)
2024 {
2025         struct rev_info revs;
2026         struct patch_ids ids;
2027         struct commit *commit;
2028         struct commit_list *list = NULL;
2029         struct branch *current_branch;
2030         const char *upstream;
2031         const char *head = "HEAD";
2032         const char *limit = NULL;
2033         int verbose = 0, abbrev = 0;
2034
2035         struct option options[] = {
2036                 OPT__ABBREV(&abbrev),
2037                 OPT__VERBOSE(&verbose, N_("be verbose")),
2038                 OPT_END()
2039         };
2040
2041         argc = parse_options(argc, argv, prefix, options, cherry_usage, 0);
2042
2043         switch (argc) {
2044         case 3:
2045                 limit = argv[2];
2046                 /* FALLTHROUGH */
2047         case 2:
2048                 head = argv[1];
2049                 /* FALLTHROUGH */
2050         case 1:
2051                 upstream = argv[0];
2052                 break;
2053         default:
2054                 current_branch = branch_get(NULL);
2055                 upstream = branch_get_upstream(current_branch, NULL);
2056                 if (!upstream) {
2057                         fprintf(stderr, _("Could not find a tracked"
2058                                         " remote branch, please"
2059                                         " specify <upstream> manually.\n"));
2060                         usage_with_options(cherry_usage, options);
2061                 }
2062         }
2063
2064         repo_init_revisions(the_repository, &revs, prefix);
2065         revs.max_parents = 1;
2066
2067         if (add_pending_commit(head, &revs, 0))
2068                 die(_("Unknown commit %s"), head);
2069         if (add_pending_commit(upstream, &revs, UNINTERESTING))
2070                 die(_("Unknown commit %s"), upstream);
2071
2072         /* Don't say anything if head and upstream are the same. */
2073         if (revs.pending.nr == 2) {
2074                 struct object_array_entry *o = revs.pending.objects;
2075                 if (oideq(&o[0].item->oid, &o[1].item->oid))
2076                         return 0;
2077         }
2078
2079         get_patch_ids(&revs, &ids);
2080
2081         if (limit && add_pending_commit(limit, &revs, UNINTERESTING))
2082                 die(_("Unknown commit %s"), limit);
2083
2084         /* reverse the list of commits */
2085         if (prepare_revision_walk(&revs))
2086                 die(_("revision walk setup failed"));
2087         while ((commit = get_revision(&revs)) != NULL) {
2088                 commit_list_insert(commit, &list);
2089         }
2090
2091         while (list) {
2092                 char sign = '+';
2093
2094                 commit = list->item;
2095                 if (has_commit_patch_id(commit, &ids))
2096                         sign = '-';
2097                 print_commit(sign, commit, verbose, abbrev, revs.diffopt.file);
2098                 list = list->next;
2099         }
2100
2101         free_patch_ids(&ids);
2102         return 0;
2103 }