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 "refs.h"
   9 #include "color.h"
  10 #include "commit.h"
  11 #include "diff.h"
  12 #include "revision.h"
  13 #include "log-tree.h"
  14 #include "builtin.h"
  15 #include "tag.h"
  16 #include "reflog-walk.h"
  17 #include "patch-ids.h"
  18 #include "run-command.h"
  19 #include "shortlog.h"
  20 #include "remote.h"
  21 #include "string-list.h"
  22 #include "parse-options.h"
  23 #include "line-log.h"
  24 #include "branch.h"
  25 #include "streaming.h"
  26 #include "version.h"
  27 #include "mailmap.h"
  28 #include "gpg-interface.h"
  29
  30 /* Set a default date-time format for git log ("log.date" config variable) */
  31 static const char *default_date_mode = NULL;
  32
  33 static int default_abbrev_commit;
  34 static int default_show_root = 1;
  35 static int default_follow;
  36 static int default_show_signature;
  37 static int decoration_style;
  38 static int decoration_given;
  39 static int use_mailmap_config;
  40 static const char *fmt_patch_subject_prefix = "PATCH";
  41 static const char *fmt_pretty;
  42
  43 static const char * const builtin_log_usage[] = {
  44         N_("git log [<options>] [<revision-range>] [[--] <path>...]"),
  45         N_("git show [<options>] <object>..."),
  46         NULL
  47 };
  48
  49 struct line_opt_callback_data {
  50         struct rev_info *rev;
  51         const char *prefix;
  52         struct string_list args;
  53 };
  54
  55 static int auto_decoration_style(void)
  56 {
  57         return (isatty(1) || pager_in_use()) ? DECORATE_SHORT_REFS : 0;
  58 }
  59
  60 static int parse_decoration_style(const char *var, const char *value)
  61 {
  62         switch (git_config_maybe_bool(var, value)) {
  63         case 1:
  64                 return DECORATE_SHORT_REFS;
  65         case 0:
  66                 return 0;
  67         default:
  68                 break;
  69         }
  70         if (!strcmp(value, "full"))
  71                 return DECORATE_FULL_REFS;
  72         else if (!strcmp(value, "short"))
  73                 return DECORATE_SHORT_REFS;
  74         else if (!strcmp(value, "auto"))
  75                 return auto_decoration_style();
  76         return -1;
  77 }
  78
  79 static int decorate_callback(const struct option *opt, const char *arg, int unset)
  80 {
  81         if (unset)
  82                 decoration_style = 0;
  83         else if (arg)
  84                 decoration_style = parse_decoration_style("command line", arg);
  85         else
  86                 decoration_style = DECORATE_SHORT_REFS;
  87
  88         if (decoration_style < 0)
  89                 die(_("invalid --decorate option: %s"), arg);
  90
  91         decoration_given = 1;
  92
  93         return 0;
  94 }
  95
  96 static int log_line_range_callback(const struct option *option, const char *arg, int unset)
  97 {
  98         struct line_opt_callback_data *data = option->value;
  99
 100         if (!arg)
 101                 return -1;
 102
 103         data->rev->line_level_traverse = 1;
 104         string_list_append(&data->args, arg);
 105
 106         return 0;
 107 }
 108
 109 static void init_log_defaults(void)
 110 {
 111         init_grep_defaults();
 112         init_diff_ui_defaults();
 113 }
 114
 115 static void cmd_log_init_defaults(struct rev_info *rev)
 116 {
 117         if (fmt_pretty)
 118                 get_commit_format(fmt_pretty, rev);
 119         if (default_follow)
 120                 DIFF_OPT_SET(&rev->diffopt, DEFAULT_FOLLOW_RENAMES);
 121         rev->verbose_header = 1;
 122         DIFF_OPT_SET(&rev->diffopt, RECURSIVE);
 123         rev->diffopt.stat_width = -1; /* use full terminal width */
 124         rev->diffopt.stat_graph_width = -1; /* respect statGraphWidth config */
 125         rev->abbrev_commit = default_abbrev_commit;
 126         rev->show_root_diff = default_show_root;
 127         rev->subject_prefix = fmt_patch_subject_prefix;
 128         rev->show_signature = default_show_signature;
 129         DIFF_OPT_SET(&rev->diffopt, ALLOW_TEXTCONV);
 130
 131         if (default_date_mode)
 132                 parse_date_format(default_date_mode, &rev->date_mode);
 133         rev->diffopt.touched_flags = 0;
 134 }
 135
 136 static void cmd_log_init_finish(int argc, const char **argv, const char *prefix,
 137                          struct rev_info *rev, struct setup_revision_opt *opt)
 138 {
 139         struct userformat_want w;
 140         int quiet = 0, source = 0, mailmap = 0;
 141         static struct line_opt_callback_data line_cb = {NULL, NULL, STRING_LIST_INIT_DUP};
 142
 143         const struct option builtin_log_options[] = {
 144                 OPT__QUIET(&quiet, N_("suppress diff output")),
 145                 OPT_BOOL(0, "source", &source, N_("show source")),
 146                 OPT_BOOL(0, "use-mailmap", &mailmap, N_("Use mail map file")),
 147                 { OPTION_CALLBACK, 0, "decorate", NULL, NULL, N_("decorate options"),
 148                   PARSE_OPT_OPTARG, decorate_callback},
 149                 OPT_CALLBACK('L', NULL, &line_cb, "n,m:file",
 150                              N_("Process line range n,m in file, counting from 1"),
 151                              log_line_range_callback),
 152                 OPT_END()
 153         };
 154
 155         line_cb.rev = rev;
 156         line_cb.prefix = prefix;
 157
 158         mailmap = use_mailmap_config;
 159         argc = parse_options(argc, argv, prefix,
 160                              builtin_log_options, builtin_log_usage,
 161                              PARSE_OPT_KEEP_ARGV0 | PARSE_OPT_KEEP_UNKNOWN |
 162                              PARSE_OPT_KEEP_DASHDASH);
 163
 164         if (quiet)
 165                 rev->diffopt.output_format |= DIFF_FORMAT_NO_OUTPUT;
 166         argc = setup_revisions(argc, argv, rev, opt);
 167
 168         /* Any arguments at this point are not recognized */
 169         if (argc > 1)
 170                 die(_("unrecognized argument: %s"), argv[1]);
 171
 172         memset(&w, 0, sizeof(w));
 173         userformat_find_requirements(NULL, &w);
 174
 175         if (!rev->show_notes_given && (!rev->pretty_given || w.notes))
 176                 rev->show_notes = 1;
 177         if (rev->show_notes)
 178                 init_display_notes(&rev->notes_opt);
 179
 180         if (rev->diffopt.pickaxe || rev->diffopt.filter ||
 181             DIFF_OPT_TST(&rev->diffopt, FOLLOW_RENAMES))
 182                 rev->always_show_header = 0;
 183
 184         if (source)
 185                 rev->show_source = 1;
 186
 187         if (mailmap) {
 188                 rev->mailmap = xcalloc(1, sizeof(struct string_list));
 189                 read_mailmap(rev->mailmap, NULL);
 190         }
 191
 192         if (rev->pretty_given && rev->commit_format == CMIT_FMT_RAW) {
 193                 /*
 194                  * "log --pretty=raw" is special; ignore UI oriented
 195                  * configuration variables such as decoration.
 196                  */
 197                 if (!decoration_given)
 198                         decoration_style = 0;
 199                 if (!rev->abbrev_commit_given)
 200                         rev->abbrev_commit = 0;
 201         }
 202
 203         if (decoration_style) {
 204                 rev->show_decorations = 1;
 205                 load_ref_decorations(decoration_style);
 206         }
 207
 208         if (rev->line_level_traverse)
 209                 line_log_init(rev, line_cb.prefix, &line_cb.args);
 210
 211         setup_pager();
 212 }
 213
 214 static void cmd_log_init(int argc, const char **argv, const char *prefix,
 215                          struct rev_info *rev, struct setup_revision_opt *opt)
 216 {
 217         cmd_log_init_defaults(rev);
 218         cmd_log_init_finish(argc, argv, prefix, rev, opt);
 219 }
 220
 221 /*
 222  * This gives a rough estimate for how many commits we
 223  * will print out in the list.
 224  */
 225 static int estimate_commit_count(struct rev_info *rev, struct commit_list *list)
 226 {
 227         int n = 0;
 228
 229         while (list) {
 230                 struct commit *commit = list->item;
 231                 unsigned int flags = commit->object.flags;
 232                 list = list->next;
 233                 if (!(flags & (TREESAME | UNINTERESTING)))
 234                         n++;
 235         }
 236         return n;
 237 }
 238
 239 static void show_early_header(struct rev_info *rev, const char *stage, int nr)
 240 {
 241         if (rev->shown_one) {
 242                 rev->shown_one = 0;
 243                 if (rev->commit_format != CMIT_FMT_ONELINE)
 244                         putchar(rev->diffopt.line_termination);
 245         }
 246         fprintf(rev->diffopt.file, _("Final output: %d %s\n"), nr, stage);
 247 }
 248
 249 static struct itimerval early_output_timer;
 250
 251 static void log_show_early(struct rev_info *revs, struct commit_list *list)
 252 {
 253         int i = revs->early_output, close_file = revs->diffopt.close_file;
 254         int show_header = 1;
 255
 256         revs->diffopt.close_file = 0;
 257         sort_in_topological_order(&list, revs->sort_order);
 258         while (list && i) {
 259                 struct commit *commit = list->item;
 260                 switch (simplify_commit(revs, commit)) {
 261                 case commit_show:
 262                         if (show_header) {
 263                                 int n = estimate_commit_count(revs, list);
 264                                 show_early_header(revs, "incomplete", n);
 265                                 show_header = 0;
 266                         }
 267                         log_tree_commit(revs, commit);
 268                         i--;
 269                         break;
 270                 case commit_ignore:
 271                         break;
 272                 case commit_error:
 273                         if (close_file)
 274                                 fclose(revs->diffopt.file);
 275                         return;
 276                 }
 277                 list = list->next;
 278         }
 279
 280         /* Did we already get enough commits for the early output? */
 281         if (!i) {
 282                 if (close_file)
 283                         fclose(revs->diffopt.file);
 284                 return;
 285         }
 286
 287         /*
 288          * ..if no, then repeat it twice a second until we
 289          * do.
 290          *
 291          * NOTE! We don't use "it_interval", because if the
 292          * reader isn't listening, we want our output to be
 293          * throttled by the writing, and not have the timer
 294          * trigger every second even if we're blocked on a
 295          * reader!
 296          */
 297         early_output_timer.it_value.tv_sec = 0;
 298         early_output_timer.it_value.tv_usec = 500000;
 299         setitimer(ITIMER_REAL, &early_output_timer, NULL);
 300 }
 301
 302 static void early_output(int signal)
 303 {
 304         show_early_output = log_show_early;
 305 }
 306
 307 static void setup_early_output(struct rev_info *rev)
 308 {
 309         struct sigaction sa;
 310
 311         /*
 312          * Set up the signal handler, minimally intrusively:
 313          * we only set a single volatile integer word (not
 314          * using sigatomic_t - trying to avoid unnecessary
 315          * system dependencies and headers), and using
 316          * SA_RESTART.
 317          */
 318         memset(&sa, 0, sizeof(sa));
 319         sa.sa_handler = early_output;
 320         sigemptyset(&sa.sa_mask);
 321         sa.sa_flags = SA_RESTART;
 322         sigaction(SIGALRM, &sa, NULL);
 323
 324         /*
 325          * If we can get the whole output in less than a
 326          * tenth of a second, don't even bother doing the
 327          * early-output thing..
 328          *
 329          * This is a one-time-only trigger.
 330          */
 331         early_output_timer.it_value.tv_sec = 0;
 332         early_output_timer.it_value.tv_usec = 100000;
 333         setitimer(ITIMER_REAL, &early_output_timer, NULL);
 334 }
 335
 336 static void finish_early_output(struct rev_info *rev)
 337 {
 338         int n = estimate_commit_count(rev, rev->commits);
 339         signal(SIGALRM, SIG_IGN);
 340         show_early_header(rev, "done", n);
 341 }
 342
 343 static int cmd_log_walk(struct rev_info *rev)
 344 {
 345         struct commit *commit;
 346         int saved_nrl = 0;
 347         int saved_dcctc = 0, close_file = rev->diffopt.close_file;
 348
 349         if (rev->early_output)
 350                 setup_early_output(rev);
 351
 352         if (prepare_revision_walk(rev))
 353                 die(_("revision walk setup failed"));
 354
 355         if (rev->early_output)
 356                 finish_early_output(rev);
 357
 358         /*
 359          * For --check and --exit-code, the exit code is based on CHECK_FAILED
 360          * and HAS_CHANGES being accumulated in rev->diffopt, so be careful to
 361          * retain that state information if replacing rev->diffopt in this loop
 362          */
 363         rev->diffopt.close_file = 0;
 364         while ((commit = get_revision(rev)) != NULL) {
 365                 if (!log_tree_commit(rev, commit) && rev->max_count >= 0)
 366                         /*
 367                          * We decremented max_count in get_revision,
 368                          * but we didn't actually show the commit.
 369                          */
 370                         rev->max_count++;
 371                 if (!rev->reflog_info) {
 372                         /* we allow cycles in reflog ancestry */
 373                         free_commit_buffer(commit);
 374                 }
 375                 free_commit_list(commit->parents);
 376                 commit->parents = NULL;
 377                 if (saved_nrl < rev->diffopt.needed_rename_limit)
 378                         saved_nrl = rev->diffopt.needed_rename_limit;
 379                 if (rev->diffopt.degraded_cc_to_c)
 380                         saved_dcctc = 1;
 381         }
 382         rev->diffopt.degraded_cc_to_c = saved_dcctc;
 383         rev->diffopt.needed_rename_limit = saved_nrl;
 384         if (close_file)
 385                 fclose(rev->diffopt.file);
 386
 387         if (rev->diffopt.output_format & DIFF_FORMAT_CHECKDIFF &&
 388             DIFF_OPT_TST(&rev->diffopt, CHECK_FAILED)) {
 389                 return 02;
 390         }
 391         return diff_result_code(&rev->diffopt, 0);
 392 }
 393
 394 static int git_log_config(const char *var, const char *value, void *cb)
 395 {
 396         const char *slot_name;
 397
 398         if (!strcmp(var, "format.pretty"))
 399                 return git_config_string(&fmt_pretty, var, value);
 400         if (!strcmp(var, "format.subjectprefix"))
 401                 return git_config_string(&fmt_patch_subject_prefix, var, value);
 402         if (!strcmp(var, "log.abbrevcommit")) {
 403                 default_abbrev_commit = git_config_bool(var, value);
 404                 return 0;
 405         }
 406         if (!strcmp(var, "log.date"))
 407                 return git_config_string(&default_date_mode, var, value);
 408         if (!strcmp(var, "log.decorate")) {
 409                 decoration_style = parse_decoration_style(var, value);
 410                 if (decoration_style < 0)
 411                         decoration_style = 0; /* maybe warn? */
 412                 return 0;
 413         } else {
 414                 decoration_style = auto_decoration_style();
 415         }
 416         if (!strcmp(var, "log.showroot")) {
 417                 default_show_root = git_config_bool(var, value);
 418                 return 0;
 419         }
 420         if (!strcmp(var, "log.follow")) {
 421                 default_follow = git_config_bool(var, value);
 422                 return 0;
 423         }
 424         if (skip_prefix(var, "color.decorate.", &slot_name))
 425                 return parse_decorate_color_config(var, slot_name, value);
 426         if (!strcmp(var, "log.mailmap")) {
 427                 use_mailmap_config = git_config_bool(var, value);
 428                 return 0;
 429         }
 430         if (!strcmp(var, "log.showsignature")) {
 431                 default_show_signature = git_config_bool(var, value);
 432                 return 0;
 433         }
 434
 435         if (grep_config(var, value, cb) < 0)
 436                 return -1;
 437         if (git_gpg_config(var, value, cb) < 0)
 438                 return -1;
 439         return git_diff_ui_config(var, value, cb);
 440 }
 441
 442 int cmd_whatchanged(int argc, const char **argv, const char *prefix)
 443 {
 444         struct rev_info rev;
 445         struct setup_revision_opt opt;
 446
 447         init_log_defaults();
 448         git_config(git_log_config, NULL);
 449
 450         init_revisions(&rev, prefix);
 451         rev.diff = 1;
 452         rev.simplify_history = 0;
 453         memset(&opt, 0, sizeof(opt));
 454         opt.def = "HEAD";
 455         opt.revarg_opt = REVARG_COMMITTISH;
 456         cmd_log_init(argc, argv, prefix, &rev, &opt);
 457         if (!rev.diffopt.output_format)
 458                 rev.diffopt.output_format = DIFF_FORMAT_RAW;
 459         return cmd_log_walk(&rev);
 460 }
 461
 462 static void show_tagger(char *buf, int len, struct rev_info *rev)
 463 {
 464         struct strbuf out = STRBUF_INIT;
 465         struct pretty_print_context pp = {0};
 466
 467         pp.fmt = rev->commit_format;
 468         pp.date_mode = rev->date_mode;
 469         pp_user_info(&pp, "Tagger", &out, buf, get_log_output_encoding());
 470         fprintf(rev->diffopt.file, "%s", out.buf);
 471         strbuf_release(&out);
 472 }
 473
 474 static int show_blob_object(const struct object_id *oid, struct rev_info *rev, const char *obj_name)
 475 {
 476         struct object_id oidc;
 477         struct object_context obj_context;
 478         char *buf;
 479         unsigned long size;
 480
 481         fflush(rev->diffopt.file);
 482         if (!DIFF_OPT_TOUCHED(&rev->diffopt, ALLOW_TEXTCONV) ||
 483             !DIFF_OPT_TST(&rev->diffopt, ALLOW_TEXTCONV))
 484                 return stream_blob_to_fd(1, oid, NULL, 0);
 485
 486         if (get_sha1_with_context(obj_name, 0, oidc.hash, &obj_context))
 487                 die(_("Not a valid object name %s"), obj_name);
 488         if (!obj_context.path[0] ||
 489             !textconv_object(obj_context.path, obj_context.mode, &oidc, 1, &buf, &size))
 490                 return stream_blob_to_fd(1, oid, NULL, 0);
 491
 492         if (!buf)
 493                 die(_("git show %s: bad file"), obj_name);
 494
 495         write_or_die(1, buf, size);
 496         return 0;
 497 }
 498
 499 static int show_tag_object(const struct object_id *oid, struct rev_info *rev)
 500 {
 501         unsigned long size;
 502         enum object_type type;
 503         char *buf = read_sha1_file(oid->hash, &type, &size);
 504         int offset = 0;
 505
 506         if (!buf)
 507                 return error(_("Could not read object %s"), oid_to_hex(oid));
 508
 509         assert(type == OBJ_TAG);
 510         while (offset < size && buf[offset] != '\n') {
 511                 int new_offset = offset + 1;
 512                 while (new_offset < size && buf[new_offset++] != '\n')
 513                         ; /* do nothing */
 514                 if (starts_with(buf + offset, "tagger "))
 515                         show_tagger(buf + offset + 7,
 516                                     new_offset - offset - 7, rev);
 517                 offset = new_offset;
 518         }
 519
 520         if (offset < size)
 521                 fwrite(buf + offset, size - offset, 1, rev->diffopt.file);
 522         free(buf);
 523         return 0;
 524 }
 525
 526 static int show_tree_object(const unsigned char *sha1,
 527                 struct strbuf *base,
 528                 const char *pathname, unsigned mode, int stage, void *context)
 529 {
 530         FILE *file = context;
 531         fprintf(file, "%s%s\n", pathname, S_ISDIR(mode) ? "/" : "");
 532         return 0;
 533 }
 534
 535 static void show_setup_revisions_tweak(struct rev_info *rev,
 536                                        struct setup_revision_opt *opt)
 537 {
 538         if (rev->ignore_merges) {
 539                 /* There was no "-m" on the command line */
 540                 rev->ignore_merges = 0;
 541                 if (!rev->first_parent_only && !rev->combine_merges) {
 542                         /* No "--first-parent", "-c", or "--cc" */
 543                         rev->combine_merges = 1;
 544                         rev->dense_combined_merges = 1;
 545                 }
 546         }
 547         if (!rev->diffopt.output_format)
 548                 rev->diffopt.output_format = DIFF_FORMAT_PATCH;
 549 }
 550
 551 int cmd_show(int argc, const char **argv, const char *prefix)
 552 {
 553         struct rev_info rev;
 554         struct object_array_entry *objects;
 555         struct setup_revision_opt opt;
 556         struct pathspec match_all;
 557         int i, count, ret = 0;
 558
 559         init_log_defaults();
 560         git_config(git_log_config, NULL);
 561
 562         memset(&match_all, 0, sizeof(match_all));
 563         init_revisions(&rev, prefix);
 564         rev.diff = 1;
 565         rev.always_show_header = 1;
 566         rev.no_walk = REVISION_WALK_NO_WALK_SORTED;
 567         rev.diffopt.stat_width = -1;    /* Scale to real terminal size */
 568
 569         memset(&opt, 0, sizeof(opt));
 570         opt.def = "HEAD";
 571         opt.tweak = show_setup_revisions_tweak;
 572         cmd_log_init(argc, argv, prefix, &rev, &opt);
 573
 574         if (!rev.no_walk)
 575                 return cmd_log_walk(&rev);
 576
 577         count = rev.pending.nr;
 578         objects = rev.pending.objects;
 579         for (i = 0; i < count && !ret; i++) {
 580                 struct object *o = objects[i].item;
 581                 const char *name = objects[i].name;
 582                 switch (o->type) {
 583                 case OBJ_BLOB:
 584                         ret = show_blob_object(&o->oid, &rev, name);
 585                         break;
 586                 case OBJ_TAG: {
 587                         struct tag *t = (struct tag *)o;
 588
 589                         if (rev.shown_one)
 590                                 putchar('\n');
 591                         fprintf(rev.diffopt.file, "%stag %s%s\n",
 592                                         diff_get_color_opt(&rev.diffopt, DIFF_COMMIT),
 593                                         t->tag,
 594                                         diff_get_color_opt(&rev.diffopt, DIFF_RESET));
 595                         ret = show_tag_object(&o->oid, &rev);
 596                         rev.shown_one = 1;
 597                         if (ret)
 598                                 break;
 599                         o = parse_object(t->tagged->oid.hash);
 600                         if (!o)
 601                                 ret = error(_("Could not read object %s"),
 602                                             oid_to_hex(&t->tagged->oid));
 603                         objects[i].item = o;
 604                         i--;
 605                         break;
 606                 }
 607                 case OBJ_TREE:
 608                         if (rev.shown_one)
 609                                 putchar('\n');
 610                         fprintf(rev.diffopt.file, "%stree %s%s\n\n",
 611                                         diff_get_color_opt(&rev.diffopt, DIFF_COMMIT),
 612                                         name,
 613                                         diff_get_color_opt(&rev.diffopt, DIFF_RESET));
 614                         read_tree_recursive((struct tree *)o, "", 0, 0, &match_all,
 615                                         show_tree_object, rev.diffopt.file);
 616                         rev.shown_one = 1;
 617                         break;
 618                 case OBJ_COMMIT:
 619                         rev.pending.nr = rev.pending.alloc = 0;
 620                         rev.pending.objects = NULL;
 621                         add_object_array(o, name, &rev.pending);
 622                         ret = cmd_log_walk(&rev);
 623                         break;
 624                 default:
 625                         ret = error(_("Unknown type: %d"), o->type);
 626                 }
 627         }
 628         free(objects);
 629         return ret;
 630 }
 631
 632 /*
 633  * This is equivalent to "git log -g --abbrev-commit --pretty=oneline"
 634  */
 635 int cmd_log_reflog(int argc, const char **argv, const char *prefix)
 636 {
 637         struct rev_info rev;
 638         struct setup_revision_opt opt;
 639
 640         init_log_defaults();
 641         git_config(git_log_config, NULL);
 642
 643         init_revisions(&rev, prefix);
 644         init_reflog_walk(&rev.reflog_info);
 645         rev.verbose_header = 1;
 646         memset(&opt, 0, sizeof(opt));
 647         opt.def = "HEAD";
 648         cmd_log_init_defaults(&rev);
 649         rev.abbrev_commit = 1;
 650         rev.commit_format = CMIT_FMT_ONELINE;
 651         rev.use_terminator = 1;
 652         rev.always_show_header = 1;
 653         cmd_log_init_finish(argc, argv, prefix, &rev, &opt);
 654
 655         return cmd_log_walk(&rev);
 656 }
 657
 658 static void log_setup_revisions_tweak(struct rev_info *rev,
 659                                       struct setup_revision_opt *opt)
 660 {
 661         if (DIFF_OPT_TST(&rev->diffopt, DEFAULT_FOLLOW_RENAMES) &&
 662             rev->prune_data.nr == 1)
 663                 DIFF_OPT_SET(&rev->diffopt, FOLLOW_RENAMES);
 664
 665         /* Turn --cc/-c into -p --cc/-c when -p was not given */
 666         if (!rev->diffopt.output_format && rev->combine_merges)
 667                 rev->diffopt.output_format = DIFF_FORMAT_PATCH;
 668
 669         /* Turn -m on when --cc/-c was given */
 670         if (rev->combine_merges)
 671                 rev->ignore_merges = 0;
 672 }
 673
 674 int cmd_log(int argc, const char **argv, const char *prefix)
 675 {
 676         struct rev_info rev;
 677         struct setup_revision_opt opt;
 678
 679         init_log_defaults();
 680         git_config(git_log_config, NULL);
 681
 682         init_revisions(&rev, prefix);
 683         rev.always_show_header = 1;
 684         memset(&opt, 0, sizeof(opt));
 685         opt.def = "HEAD";
 686         opt.revarg_opt = REVARG_COMMITTISH;
 687         opt.tweak = log_setup_revisions_tweak;
 688         cmd_log_init(argc, argv, prefix, &rev, &opt);
 689         return cmd_log_walk(&rev);
 690 }
 691
 692 /* format-patch */
 693
 694 static const char *fmt_patch_suffix = ".patch";
 695 static int numbered = 0;
 696 static int auto_number = 1;
 697
 698 static char *default_attach = NULL;
 699
 700 static struct string_list extra_hdr = STRING_LIST_INIT_NODUP;
 701 static struct string_list extra_to = STRING_LIST_INIT_NODUP;
 702 static struct string_list extra_cc = STRING_LIST_INIT_NODUP;
 703
 704 static void add_header(const char *value)
 705 {
 706         struct string_list_item *item;
 707         int len = strlen(value);
 708         while (len && value[len - 1] == '\n')
 709                 len--;
 710
 711         if (!strncasecmp(value, "to: ", 4)) {
 712                 item = string_list_append(&extra_to, value + 4);
 713                 len -= 4;
 714         } else if (!strncasecmp(value, "cc: ", 4)) {
 715                 item = string_list_append(&extra_cc, value + 4);
 716                 len -= 4;
 717         } else {
 718                 item = string_list_append(&extra_hdr, value);
 719         }
 720
 721         item->string[len] = '\0';
 722 }
 723
 724 #define THREAD_SHALLOW 1
 725 #define THREAD_DEEP 2
 726 static int thread;
 727 static int do_signoff;
 728 static int base_auto;
 729 static char *from;
 730 static const char *signature = git_version_string;
 731 static const char *signature_file;
 732 static int config_cover_letter;
 733 static const char *config_output_directory;
 734
 735 enum {
 736         COVER_UNSET,
 737         COVER_OFF,
 738         COVER_ON,
 739         COVER_AUTO
 740 };
 741
 742 static int git_format_config(const char *var, const char *value, void *cb)
 743 {
 744         if (!strcmp(var, "format.headers")) {
 745                 if (!value)
 746                         die(_("format.headers without value"));
 747                 add_header(value);
 748                 return 0;
 749         }
 750         if (!strcmp(var, "format.suffix"))
 751                 return git_config_string(&fmt_patch_suffix, var, value);
 752         if (!strcmp(var, "format.to")) {
 753                 if (!value)
 754                         return config_error_nonbool(var);
 755                 string_list_append(&extra_to, value);
 756                 return 0;
 757         }
 758         if (!strcmp(var, "format.cc")) {
 759                 if (!value)
 760                         return config_error_nonbool(var);
 761                 string_list_append(&extra_cc, value);
 762                 return 0;
 763         }
 764         if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff") ||
 765             !strcmp(var, "color.ui") || !strcmp(var, "diff.submodule")) {
 766                 return 0;
 767         }
 768         if (!strcmp(var, "format.numbered")) {
 769                 if (value && !strcasecmp(value, "auto")) {
 770                         auto_number = 1;
 771                         return 0;
 772                 }
 773                 numbered = git_config_bool(var, value);
 774                 auto_number = auto_number && numbered;
 775                 return 0;
 776         }
 777         if (!strcmp(var, "format.attach")) {
 778                 if (value && *value)
 779                         default_attach = xstrdup(value);
 780                 else
 781                         default_attach = xstrdup(git_version_string);
 782                 return 0;
 783         }
 784         if (!strcmp(var, "format.thread")) {
 785                 if (value && !strcasecmp(value, "deep")) {
 786                         thread = THREAD_DEEP;
 787                         return 0;
 788                 }
 789                 if (value && !strcasecmp(value, "shallow")) {
 790                         thread = THREAD_SHALLOW;
 791                         return 0;
 792                 }
 793                 thread = git_config_bool(var, value) && THREAD_SHALLOW;
 794                 return 0;
 795         }
 796         if (!strcmp(var, "format.signoff")) {
 797                 do_signoff = git_config_bool(var, value);
 798                 return 0;
 799         }
 800         if (!strcmp(var, "format.signature"))
 801                 return git_config_string(&signature, var, value);
 802         if (!strcmp(var, "format.signaturefile"))
 803                 return git_config_pathname(&signature_file, var, value);
 804         if (!strcmp(var, "format.coverletter")) {
 805                 if (value && !strcasecmp(value, "auto")) {
 806                         config_cover_letter = COVER_AUTO;
 807                         return 0;
 808                 }
 809                 config_cover_letter = git_config_bool(var, value) ? COVER_ON : COVER_OFF;
 810                 return 0;
 811         }
 812         if (!strcmp(var, "format.outputdirectory"))
 813                 return git_config_string(&config_output_directory, var, value);
 814         if (!strcmp(var, "format.useautobase")) {
 815                 base_auto = git_config_bool(var, value);
 816                 return 0;
 817         }
 818         if (!strcmp(var, "format.from")) {
 819                 int b = git_config_maybe_bool(var, value);
 820                 free(from);
 821                 if (b < 0)
 822                         from = xstrdup(value);
 823                 else if (b)
 824                         from = xstrdup(git_committer_info(IDENT_NO_DATE));
 825                 else
 826                         from = NULL;
 827                 return 0;
 828         }
 829
 830         return git_log_config(var, value, cb);
 831 }
 832
 833 static const char *output_directory = NULL;
 834 static int outdir_offset;
 835
 836 static int open_next_file(struct commit *commit, const char *subject,
 837                          struct rev_info *rev, int quiet)
 838 {
 839         struct strbuf filename = STRBUF_INIT;
 840         int suffix_len = strlen(rev->patch_suffix) + 1;
 841
 842         if (output_directory) {
 843                 strbuf_addstr(&filename, output_directory);
 844                 if (filename.len >=
 845                     PATH_MAX - FORMAT_PATCH_NAME_MAX - suffix_len)
 846                         return error(_("name of output directory is too long"));
 847                 strbuf_complete(&filename, '/');
 848         }
 849
 850         if (rev->numbered_files)
 851                 strbuf_addf(&filename, "%d", rev->nr);
 852         else if (commit)
 853                 fmt_output_commit(&filename, commit, rev);
 854         else
 855                 fmt_output_subject(&filename, subject, rev);
 856
 857         if (!quiet)
 858                 printf("%s\n", filename.buf + outdir_offset);
 859
 860         if ((rev->diffopt.file = fopen(filename.buf, "w")) == NULL)
 861                 return error(_("Cannot open patch file %s"), filename.buf);
 862
 863         strbuf_release(&filename);
 864         return 0;
 865 }
 866
 867 static void get_patch_ids(struct rev_info *rev, struct patch_ids *ids)
 868 {
 869         struct rev_info check_rev;
 870         struct commit *commit, *c1, *c2;
 871         struct object *o1, *o2;
 872         unsigned flags1, flags2;
 873
 874         if (rev->pending.nr != 2)
 875                 die(_("Need exactly one range."));
 876
 877         o1 = rev->pending.objects[0].item;
 878         o2 = rev->pending.objects[1].item;
 879         flags1 = o1->flags;
 880         flags2 = o2->flags;
 881         c1 = lookup_commit_reference(o1->oid.hash);
 882         c2 = lookup_commit_reference(o2->oid.hash);
 883
 884         if ((flags1 & UNINTERESTING) == (flags2 & UNINTERESTING))
 885                 die(_("Not a range."));
 886
 887         init_patch_ids(ids);
 888
 889         /* given a range a..b get all patch ids for b..a */
 890         init_revisions(&check_rev, rev->prefix);
 891         check_rev.max_parents = 1;
 892         o1->flags ^= UNINTERESTING;
 893         o2->flags ^= UNINTERESTING;
 894         add_pending_object(&check_rev, o1, "o1");
 895         add_pending_object(&check_rev, o2, "o2");
 896         if (prepare_revision_walk(&check_rev))
 897                 die(_("revision walk setup failed"));
 898
 899         while ((commit = get_revision(&check_rev)) != NULL) {
 900                 add_commit_patch_id(commit, ids);
 901         }
 902
 903         /* reset for next revision walk */
 904         clear_commit_marks(c1, SEEN | UNINTERESTING | SHOWN | ADDED);
 905         clear_commit_marks(c2, SEEN | UNINTERESTING | SHOWN | ADDED);
 906         o1->flags = flags1;
 907         o2->flags = flags2;
 908 }
 909
 910 static void gen_message_id(struct rev_info *info, char *base)
 911 {
 912         struct strbuf buf = STRBUF_INIT;
 913         strbuf_addf(&buf, "%s.%lu.git.%s", base,
 914                     (unsigned long) time(NULL),
 915                     git_committer_info(IDENT_NO_NAME|IDENT_NO_DATE|IDENT_STRICT));
 916         info->message_id = strbuf_detach(&buf, NULL);
 917 }
 918
 919 static void print_signature(FILE *file)
 920 {
 921         if (!signature || !*signature)
 922                 return;
 923
 924         fprintf(file, "-- \n%s", signature);
 925         if (signature[strlen(signature)-1] != '\n')
 926                 putc('\n', file);
 927         putc('\n', file);
 928 }
 929
 930 static void add_branch_description(struct strbuf *buf, const char *branch_name)
 931 {
 932         struct strbuf desc = STRBUF_INIT;
 933         if (!branch_name || !*branch_name)
 934                 return;
 935         read_branch_desc(&desc, branch_name);
 936         if (desc.len) {
 937                 strbuf_addch(buf, '\n');
 938                 strbuf_addbuf(buf, &desc);
 939                 strbuf_addch(buf, '\n');
 940         }
 941         strbuf_release(&desc);
 942 }
 943
 944 static char *find_branch_name(struct rev_info *rev)
 945 {
 946         int i, positive = -1;
 947         struct object_id branch_oid;
 948         const struct object_id *tip_oid;
 949         const char *ref, *v;
 950         char *full_ref, *branch = NULL;
 951
 952         for (i = 0; i < rev->cmdline.nr; i++) {
 953                 if (rev->cmdline.rev[i].flags & UNINTERESTING)
 954                         continue;
 955                 if (positive < 0)
 956                         positive = i;
 957                 else
 958                         return NULL;
 959         }
 960         if (positive < 0)
 961                 return NULL;
 962         ref = rev->cmdline.rev[positive].name;
 963         tip_oid = &rev->cmdline.rev[positive].item->oid;
 964         if (dwim_ref(ref, strlen(ref), branch_oid.hash, &full_ref) &&
 965             skip_prefix(full_ref, "refs/heads/", &v) &&
 966             !oidcmp(tip_oid, &branch_oid))
 967                 branch = xstrdup(v);
 968         free(full_ref);
 969         return branch;
 970 }
 971
 972 static void make_cover_letter(struct rev_info *rev, int use_stdout,
 973                               struct commit *origin,
 974                               int nr, struct commit **list,
 975                               const char *branch_name,
 976                               int quiet)
 977 {
 978         const char *committer;
 979         const char *body = "*** SUBJECT HERE ***\n\n*** BLURB HERE ***\n";
 980         const char *msg;
 981         struct shortlog log;
 982         struct strbuf sb = STRBUF_INIT;
 983         int i;
 984         const char *encoding = "UTF-8";
 985         struct diff_options opts;
 986         int need_8bit_cte = 0;
 987         struct pretty_print_context pp = {0};
 988         struct commit *head = list[0];
 989
 990         if (!cmit_fmt_is_mail(rev->commit_format))
 991                 die(_("Cover letter needs email format"));
 992
 993         committer = git_committer_info(0);
 994
 995         if (!use_stdout &&
 996             open_next_file(NULL, rev->numbered_files ? NULL : "cover-letter", rev, quiet))
 997                 return;
 998
 999         log_write_email_headers(rev, head, &pp.after_subject, &need_8bit_cte);
1000
1001         for (i = 0; !need_8bit_cte && i < nr; i++) {
1002                 const char *buf = get_commit_buffer(list[i], NULL);
1003                 if (has_non_ascii(buf))
1004                         need_8bit_cte = 1;
1005                 unuse_commit_buffer(list[i], buf);
1006         }
1007
1008         if (!branch_name)
1009                 branch_name = find_branch_name(rev);
1010
1011         msg = body;
1012         pp.fmt = CMIT_FMT_EMAIL;
1013         pp.date_mode.type = DATE_RFC2822;
1014         pp.rev = rev;
1015         pp.print_email_subject = 1;
1016         pp_user_info(&pp, NULL, &sb, committer, encoding);
1017         pp_title_line(&pp, &msg, &sb, encoding, need_8bit_cte);
1018         pp_remainder(&pp, &msg, &sb, 0);
1019         add_branch_description(&sb, branch_name);
1020         fprintf(rev->diffopt.file, "%s\n", sb.buf);
1021
1022         strbuf_release(&sb);
1023
1024         shortlog_init(&log);
1025         log.wrap_lines = 1;
1026         log.wrap = 72;
1027         log.in1 = 2;
1028         log.in2 = 4;
1029         log.file = rev->diffopt.file;
1030         for (i = 0; i < nr; i++)
1031                 shortlog_add_commit(&log, list[i]);
1032
1033         shortlog_output(&log);
1034
1035         /*
1036          * We can only do diffstat with a unique reference point
1037          */
1038         if (!origin)
1039                 return;
1040
1041         memcpy(&opts, &rev->diffopt, sizeof(opts));
1042         opts.output_format = DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT;
1043
1044         diff_setup_done(&opts);
1045
1046         diff_tree_sha1(origin->tree->object.oid.hash,
1047                        head->tree->object.oid.hash,
1048                        "", &opts);
1049         diffcore_std(&opts);
1050         diff_flush(&opts);
1051
1052         fprintf(rev->diffopt.file, "\n");
1053 }
1054
1055 static const char *clean_message_id(const char *msg_id)
1056 {
1057         char ch;
1058         const char *a, *z, *m;
1059
1060         m = msg_id;
1061         while ((ch = *m) && (isspace(ch) || (ch == '<')))
1062                 m++;
1063         a = m;
1064         z = NULL;
1065         while ((ch = *m)) {
1066                 if (!isspace(ch) && (ch != '>'))
1067                         z = m;
1068                 m++;
1069         }
1070         if (!z)
1071                 die(_("insane in-reply-to: %s"), msg_id);
1072         if (++z == m)
1073                 return a;
1074         return xmemdupz(a, z - a);
1075 }
1076
1077 static const char *set_outdir(const char *prefix, const char *output_directory)
1078 {
1079         if (output_directory && is_absolute_path(output_directory))
1080                 return output_directory;
1081
1082         if (!prefix || !*prefix) {
1083                 if (output_directory)
1084                         return output_directory;
1085                 /* The user did not explicitly ask for "./" */
1086                 outdir_offset = 2;
1087                 return "./";
1088         }
1089
1090         outdir_offset = strlen(prefix);
1091         if (!output_directory)
1092                 return prefix;
1093
1094         return prefix_filename(prefix, output_directory);
1095 }
1096
1097 static const char * const builtin_format_patch_usage[] = {
1098         N_("git format-patch [<options>] [<since> | <revision-range>]"),
1099         NULL
1100 };
1101
1102 static int keep_subject = 0;
1103
1104 static int keep_callback(const struct option *opt, const char *arg, int unset)
1105 {
1106         ((struct rev_info *)opt->value)->total = -1;
1107         keep_subject = 1;
1108         return 0;
1109 }
1110
1111 static int subject_prefix = 0;
1112
1113 static int subject_prefix_callback(const struct option *opt, const char *arg,
1114                             int unset)
1115 {
1116         subject_prefix = 1;
1117         ((struct rev_info *)opt->value)->subject_prefix = arg;
1118         return 0;
1119 }
1120
1121 static int rfc_callback(const struct option *opt, const char *arg, int unset)
1122 {
1123         return subject_prefix_callback(opt, "RFC PATCH", unset);
1124 }
1125
1126 static int numbered_cmdline_opt = 0;
1127
1128 static int numbered_callback(const struct option *opt, const char *arg,
1129                              int unset)
1130 {
1131         *(int *)opt->value = numbered_cmdline_opt = unset ? 0 : 1;
1132         if (unset)
1133                 auto_number =  0;
1134         return 0;
1135 }
1136
1137 static int no_numbered_callback(const struct option *opt, const char *arg,
1138                                 int unset)
1139 {
1140         return numbered_callback(opt, arg, 1);
1141 }
1142
1143 static int output_directory_callback(const struct option *opt, const char *arg,
1144                               int unset)
1145 {
1146         const char **dir = (const char **)opt->value;
1147         if (*dir)
1148                 die(_("Two output directories?"));
1149         *dir = arg;
1150         return 0;
1151 }
1152
1153 static int thread_callback(const struct option *opt, const char *arg, int unset)
1154 {
1155         int *thread = (int *)opt->value;
1156         if (unset)
1157                 *thread = 0;
1158         else if (!arg || !strcmp(arg, "shallow"))
1159                 *thread = THREAD_SHALLOW;
1160         else if (!strcmp(arg, "deep"))
1161                 *thread = THREAD_DEEP;
1162         else
1163                 return 1;
1164         return 0;
1165 }
1166
1167 static int attach_callback(const struct option *opt, const char *arg, int unset)
1168 {
1169         struct rev_info *rev = (struct rev_info *)opt->value;
1170         if (unset)
1171                 rev->mime_boundary = NULL;
1172         else if (arg)
1173                 rev->mime_boundary = arg;
1174         else
1175                 rev->mime_boundary = git_version_string;
1176         rev->no_inline = unset ? 0 : 1;
1177         return 0;
1178 }
1179
1180 static int inline_callback(const struct option *opt, const char *arg, int unset)
1181 {
1182         struct rev_info *rev = (struct rev_info *)opt->value;
1183         if (unset)
1184                 rev->mime_boundary = NULL;
1185         else if (arg)
1186                 rev->mime_boundary = arg;
1187         else
1188                 rev->mime_boundary = git_version_string;
1189         rev->no_inline = 0;
1190         return 0;
1191 }
1192
1193 static int header_callback(const struct option *opt, const char *arg, int unset)
1194 {
1195         if (unset) {
1196                 string_list_clear(&extra_hdr, 0);
1197                 string_list_clear(&extra_to, 0);
1198                 string_list_clear(&extra_cc, 0);
1199         } else {
1200             add_header(arg);
1201         }
1202         return 0;
1203 }
1204
1205 static int to_callback(const struct option *opt, const char *arg, int unset)
1206 {
1207         if (unset)
1208                 string_list_clear(&extra_to, 0);
1209         else
1210                 string_list_append(&extra_to, arg);
1211         return 0;
1212 }
1213
1214 static int cc_callback(const struct option *opt, const char *arg, int unset)
1215 {
1216         if (unset)
1217                 string_list_clear(&extra_cc, 0);
1218         else
1219                 string_list_append(&extra_cc, arg);
1220         return 0;
1221 }
1222
1223 static int from_callback(const struct option *opt, const char *arg, int unset)
1224 {
1225         char **from = opt->value;
1226
1227         free(*from);
1228
1229         if (unset)
1230                 *from = NULL;
1231         else if (arg)
1232                 *from = xstrdup(arg);
1233         else
1234                 *from = xstrdup(git_committer_info(IDENT_NO_DATE));
1235         return 0;
1236 }
1237
1238 struct base_tree_info {
1239         struct object_id base_commit;
1240         int nr_patch_id, alloc_patch_id;
1241         struct object_id *patch_id;
1242 };
1243
1244 static struct commit *get_base_commit(const char *base_commit,
1245                                       struct commit **list,
1246                                       int total)
1247 {
1248         struct commit *base = NULL;
1249         struct commit **rev;
1250         int i = 0, rev_nr = 0;
1251
1252         if (base_commit && strcmp(base_commit, "auto")) {
1253                 base = lookup_commit_reference_by_name(base_commit);
1254                 if (!base)
1255                         die(_("Unknown commit %s"), base_commit);
1256         } else if ((base_commit && !strcmp(base_commit, "auto")) || base_auto) {
1257                 struct branch *curr_branch = branch_get(NULL);
1258                 const char *upstream = branch_get_upstream(curr_branch, NULL);
1259                 if (upstream) {
1260                         struct commit_list *base_list;
1261                         struct commit *commit;
1262                         struct object_id oid;
1263
1264                         if (get_oid(upstream, &oid))
1265                                 die(_("Failed to resolve '%s' as a valid ref."), upstream);
1266                         commit = lookup_commit_or_die(oid.hash, "upstream base");
1267                         base_list = get_merge_bases_many(commit, total, list);
1268                         /* There should be one and only one merge base. */
1269                         if (!base_list || base_list->next)
1270                                 die(_("Could not find exact merge base."));
1271                         base = base_list->item;
1272                         free_commit_list(base_list);
1273                 } else {
1274                         die(_("Failed to get upstream, if you want to record base commit automatically,\n"
1275                               "please use git branch --set-upstream-to to track a remote branch.\n"
1276                               "Or you could specify base commit by --base=<base-commit-id> manually."));
1277                 }
1278         }
1279
1280         ALLOC_ARRAY(rev, total);
1281         for (i = 0; i < total; i++)
1282                 rev[i] = list[i];
1283
1284         rev_nr = total;
1285         /*
1286          * Get merge base through pair-wise computations
1287          * and store it in rev[0].
1288          */
1289         while (rev_nr > 1) {
1290                 for (i = 0; i < rev_nr / 2; i++) {
1291                         struct commit_list *merge_base;
1292                         merge_base = get_merge_bases(rev[2 * i], rev[2 * i + 1]);
1293                         if (!merge_base || merge_base->next)
1294                                 die(_("Failed to find exact merge base"));
1295
1296                         rev[i] = merge_base->item;
1297                 }
1298
1299                 if (rev_nr % 2)
1300                         rev[i] = rev[2 * i];
1301                 rev_nr = (rev_nr + 1) / 2;
1302         }
1303
1304         if (!in_merge_bases(base, rev[0]))
1305                 die(_("base commit should be the ancestor of revision list"));
1306
1307         for (i = 0; i < total; i++) {
1308                 if (base == list[i])
1309                         die(_("base commit shouldn't be in revision list"));
1310         }
1311
1312         free(rev);
1313         return base;
1314 }
1315
1316 static void prepare_bases(struct base_tree_info *bases,
1317                           struct commit *base,
1318                           struct commit **list,
1319                           int total)
1320 {
1321         struct commit *commit;
1322         struct rev_info revs;
1323         struct diff_options diffopt;
1324         int i;
1325
1326         if (!base)
1327                 return;
1328
1329         diff_setup(&diffopt);
1330         DIFF_OPT_SET(&diffopt, RECURSIVE);
1331         diff_setup_done(&diffopt);
1332
1333         oidcpy(&bases->base_commit, &base->object.oid);
1334
1335         init_revisions(&revs, NULL);
1336         revs.max_parents = 1;
1337         revs.topo_order = 1;
1338         for (i = 0; i < total; i++) {
1339                 list[i]->object.flags &= ~UNINTERESTING;
1340                 add_pending_object(&revs, &list[i]->object, "rev_list");
1341                 list[i]->util = (void *)1;
1342         }
1343         base->object.flags |= UNINTERESTING;
1344         add_pending_object(&revs, &base->object, "base");
1345
1346         if (prepare_revision_walk(&revs))
1347                 die(_("revision walk setup failed"));
1348         /*
1349          * Traverse the commits list, get prerequisite patch ids
1350          * and stuff them in bases structure.
1351          */
1352         while ((commit = get_revision(&revs)) != NULL) {
1353                 struct object_id oid;
1354                 struct object_id *patch_id;
1355                 if (commit->util)
1356                         continue;
1357                 if (commit_patch_id(commit, &diffopt, oid.hash, 0))
1358                         die(_("cannot get patch id"));
1359                 ALLOC_GROW(bases->patch_id, bases->nr_patch_id + 1, bases->alloc_patch_id);
1360                 patch_id = bases->patch_id + bases->nr_patch_id;
1361                 oidcpy(patch_id, &oid);
1362                 bases->nr_patch_id++;
1363         }
1364 }
1365
1366 static void print_bases(struct base_tree_info *bases, FILE *file)
1367 {
1368         int i;
1369
1370         /* Only do this once, either for the cover or for the first one */
1371         if (is_null_oid(&bases->base_commit))
1372                 return;
1373
1374         /* Show the base commit */
1375         fprintf(file, "\nbase-commit: %s\n", oid_to_hex(&bases->base_commit));
1376
1377         /* Show the prerequisite patches */
1378         for (i = bases->nr_patch_id - 1; i >= 0; i--)
1379                 fprintf(file, "prerequisite-patch-id: %s\n", oid_to_hex(&bases->patch_id[i]));
1380
1381         free(bases->patch_id);
1382         bases->nr_patch_id = 0;
1383         bases->alloc_patch_id = 0;
1384         oidclr(&bases->base_commit);
1385 }
1386
1387 int cmd_format_patch(int argc, const char **argv, const char *prefix)
1388 {
1389         struct commit *commit;
1390         struct commit **list = NULL;
1391         struct rev_info rev;
1392         struct setup_revision_opt s_r_opt;
1393         int nr = 0, total, i;
1394         int use_stdout = 0;
1395         int start_number = -1;
1396         int just_numbers = 0;
1397         int ignore_if_in_upstream = 0;
1398         int cover_letter = -1;
1399         int boundary_count = 0;
1400         int no_binary_diff = 0;
1401         int zero_commit = 0;
1402         struct commit *origin = NULL;
1403         const char *in_reply_to = NULL;
1404         struct patch_ids ids;
1405         struct strbuf buf = STRBUF_INIT;
1406         int use_patch_format = 0;
1407         int quiet = 0;
1408         int reroll_count = -1;
1409         char *branch_name = NULL;
1410         char *base_commit = NULL;
1411         struct base_tree_info bases;
1412
1413         const struct option builtin_format_patch_options[] = {
1414                 { OPTION_CALLBACK, 'n', "numbered", &numbered, NULL,
1415                             N_("use [PATCH n/m] even with a single patch"),
1416                             PARSE_OPT_NOARG, numbered_callback },
1417                 { OPTION_CALLBACK, 'N', "no-numbered", &numbered, NULL,
1418                             N_("use [PATCH] even with multiple patches"),
1419                             PARSE_OPT_NOARG, no_numbered_callback },
1420                 OPT_BOOL('s', "signoff", &do_signoff, N_("add Signed-off-by:")),
1421                 OPT_BOOL(0, "stdout", &use_stdout,
1422                             N_("print patches to standard out")),
1423                 OPT_BOOL(0, "cover-letter", &cover_letter,
1424                             N_("generate a cover letter")),
1425                 OPT_BOOL(0, "numbered-files", &just_numbers,
1426                             N_("use simple number sequence for output file names")),
1427                 OPT_STRING(0, "suffix", &fmt_patch_suffix, N_("sfx"),
1428                             N_("use <sfx> instead of '.patch'")),
1429                 OPT_INTEGER(0, "start-number", &start_number,
1430                             N_("start numbering patches at <n> instead of 1")),
1431                 OPT_INTEGER('v', "reroll-count", &reroll_count,
1432                             N_("mark the series as Nth re-roll")),
1433                 { OPTION_CALLBACK, 0, "rfc", &rev, NULL,
1434                             N_("Use [RFC PATCH] instead of [PATCH]"),
1435                             PARSE_OPT_NOARG | PARSE_OPT_NONEG, rfc_callback },
1436                 { OPTION_CALLBACK, 0, "subject-prefix", &rev, N_("prefix"),
1437                             N_("Use [<prefix>] instead of [PATCH]"),
1438                             PARSE_OPT_NONEG, subject_prefix_callback },
1439                 { OPTION_CALLBACK, 'o', "output-directory", &output_directory,
1440                             N_("dir"), N_("store resulting files in <dir>"),
1441                             PARSE_OPT_NONEG, output_directory_callback },
1442                 { OPTION_CALLBACK, 'k', "keep-subject", &rev, NULL,
1443                             N_("don't strip/add [PATCH]"),
1444                             PARSE_OPT_NOARG | PARSE_OPT_NONEG, keep_callback },
1445                 OPT_BOOL(0, "no-binary", &no_binary_diff,
1446                          N_("don't output binary diffs")),
1447                 OPT_BOOL(0, "zero-commit", &zero_commit,
1448                          N_("output all-zero hash in From header")),
1449                 OPT_BOOL(0, "ignore-if-in-upstream", &ignore_if_in_upstream,
1450                          N_("don't include a patch matching a commit upstream")),
1451                 { OPTION_SET_INT, 'p', "no-stat", &use_patch_format, NULL,
1452                   N_("show patch format instead of default (patch + stat)"),
1453                   PARSE_OPT_NONEG | PARSE_OPT_NOARG, NULL, 1},
1454                 OPT_GROUP(N_("Messaging")),
1455                 { OPTION_CALLBACK, 0, "add-header", NULL, N_("header"),
1456                             N_("add email header"), 0, header_callback },
1457                 { OPTION_CALLBACK, 0, "to", NULL, N_("email"), N_("add To: header"),
1458                             0, to_callback },
1459                 { OPTION_CALLBACK, 0, "cc", NULL, N_("email"), N_("add Cc: header"),
1460                             0, cc_callback },
1461                 { OPTION_CALLBACK, 0, "from", &from, N_("ident"),
1462                             N_("set From address to <ident> (or committer ident if absent)"),
1463                             PARSE_OPT_OPTARG, from_callback },
1464                 OPT_STRING(0, "in-reply-to", &in_reply_to, N_("message-id"),
1465                             N_("make first mail a reply to <message-id>")),
1466                 { OPTION_CALLBACK, 0, "attach", &rev, N_("boundary"),
1467                             N_("attach the patch"), PARSE_OPT_OPTARG,
1468                             attach_callback },
1469                 { OPTION_CALLBACK, 0, "inline", &rev, N_("boundary"),
1470                             N_("inline the patch"),
1471                             PARSE_OPT_OPTARG | PARSE_OPT_NONEG,
1472                             inline_callback },
1473                 { OPTION_CALLBACK, 0, "thread", &thread, N_("style"),
1474                             N_("enable message threading, styles: shallow, deep"),
1475                             PARSE_OPT_OPTARG, thread_callback },
1476                 OPT_STRING(0, "signature", &signature, N_("signature"),
1477                             N_("add a signature")),
1478                 OPT_STRING(0, "base", &base_commit, N_("base-commit"),
1479                            N_("add prerequisite tree info to the patch series")),
1480                 OPT_FILENAME(0, "signature-file", &signature_file,
1481                                 N_("add a signature from a file")),
1482                 OPT__QUIET(&quiet, N_("don't print the patch filenames")),
1483                 OPT_END()
1484         };
1485
1486         extra_hdr.strdup_strings = 1;
1487         extra_to.strdup_strings = 1;
1488         extra_cc.strdup_strings = 1;
1489         init_log_defaults();
1490         git_config(git_format_config, NULL);
1491         init_revisions(&rev, prefix);
1492         rev.commit_format = CMIT_FMT_EMAIL;
1493         rev.expand_tabs_in_log_default = 0;
1494         rev.verbose_header = 1;
1495         rev.diff = 1;
1496         rev.max_parents = 1;
1497         DIFF_OPT_SET(&rev.diffopt, RECURSIVE);
1498         rev.subject_prefix = fmt_patch_subject_prefix;
1499         memset(&s_r_opt, 0, sizeof(s_r_opt));
1500         s_r_opt.def = "HEAD";
1501         s_r_opt.revarg_opt = REVARG_COMMITTISH;
1502
1503         if (default_attach) {
1504                 rev.mime_boundary = default_attach;
1505                 rev.no_inline = 1;
1506         }
1507
1508         /*
1509          * Parse the arguments before setup_revisions(), or something
1510          * like "git format-patch -o a123 HEAD^.." may fail; a123 is
1511          * possibly a valid SHA1.
1512          */
1513         argc = parse_options(argc, argv, prefix, builtin_format_patch_options,
1514                              builtin_format_patch_usage,
1515                              PARSE_OPT_KEEP_ARGV0 | PARSE_OPT_KEEP_UNKNOWN |
1516                              PARSE_OPT_KEEP_DASHDASH);
1517
1518         if (0 < reroll_count) {
1519                 struct strbuf sprefix = STRBUF_INIT;
1520                 strbuf_addf(&sprefix, "%s v%d",
1521                             rev.subject_prefix, reroll_count);
1522                 rev.reroll_count = reroll_count;
1523                 rev.subject_prefix = strbuf_detach(&sprefix, NULL);
1524         }
1525
1526         for (i = 0; i < extra_hdr.nr; i++) {
1527                 strbuf_addstr(&buf, extra_hdr.items[i].string);
1528                 strbuf_addch(&buf, '\n');
1529         }
1530
1531         if (extra_to.nr)
1532                 strbuf_addstr(&buf, "To: ");
1533         for (i = 0; i < extra_to.nr; i++) {
1534                 if (i)
1535                         strbuf_addstr(&buf, "    ");
1536                 strbuf_addstr(&buf, extra_to.items[i].string);
1537                 if (i + 1 < extra_to.nr)
1538                         strbuf_addch(&buf, ',');
1539                 strbuf_addch(&buf, '\n');
1540         }
1541
1542         if (extra_cc.nr)
1543                 strbuf_addstr(&buf, "Cc: ");
1544         for (i = 0; i < extra_cc.nr; i++) {
1545                 if (i)
1546                         strbuf_addstr(&buf, "    ");
1547                 strbuf_addstr(&buf, extra_cc.items[i].string);
1548                 if (i + 1 < extra_cc.nr)
1549                         strbuf_addch(&buf, ',');
1550                 strbuf_addch(&buf, '\n');
1551         }
1552
1553         rev.extra_headers = strbuf_detach(&buf, NULL);
1554
1555         if (from) {
1556                 if (split_ident_line(&rev.from_ident, from, strlen(from)))
1557                         die(_("invalid ident line: %s"), from);
1558         }
1559
1560         if (start_number < 0)
1561                 start_number = 1;
1562
1563         /*
1564          * If numbered is set solely due to format.numbered in config,
1565          * and it would conflict with --keep-subject (-k) from the
1566          * command line, reset "numbered".
1567          */
1568         if (numbered && keep_subject && !numbered_cmdline_opt)
1569                 numbered = 0;
1570
1571         if (numbered && keep_subject)
1572                 die (_("-n and -k are mutually exclusive."));
1573         if (keep_subject && subject_prefix)
1574                 die (_("--subject-prefix/--rfc and -k are mutually exclusive."));
1575         rev.preserve_subject = keep_subject;
1576
1577         argc = setup_revisions(argc, argv, &rev, &s_r_opt);
1578         if (argc > 1)
1579                 die (_("unrecognized argument: %s"), argv[1]);
1580
1581         if (rev.diffopt.output_format & DIFF_FORMAT_NAME)
1582                 die(_("--name-only does not make sense"));
1583         if (rev.diffopt.output_format & DIFF_FORMAT_NAME_STATUS)
1584                 die(_("--name-status does not make sense"));
1585         if (rev.diffopt.output_format & DIFF_FORMAT_CHECKDIFF)
1586                 die(_("--check does not make sense"));
1587
1588         if (!use_patch_format &&
1589                 (!rev.diffopt.output_format ||
1590                  rev.diffopt.output_format == DIFF_FORMAT_PATCH))
1591                 rev.diffopt.output_format = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_SUMMARY;
1592
1593         /* Always generate a patch */
1594         rev.diffopt.output_format |= DIFF_FORMAT_PATCH;
1595
1596         rev.zero_commit = zero_commit;
1597
1598         if (!DIFF_OPT_TST(&rev.diffopt, TEXT) && !no_binary_diff)
1599                 DIFF_OPT_SET(&rev.diffopt, BINARY);
1600
1601         if (rev.show_notes)
1602                 init_display_notes(&rev.notes_opt);
1603
1604         if (!output_directory && !use_stdout)
1605                 output_directory = config_output_directory;
1606
1607         if (!use_stdout)
1608                 output_directory = set_outdir(prefix, output_directory);
1609         else
1610                 setup_pager();
1611
1612         if (output_directory) {
1613                 if (rev.diffopt.use_color != GIT_COLOR_ALWAYS)
1614                         rev.diffopt.use_color = GIT_COLOR_NEVER;
1615                 if (use_stdout)
1616                         die(_("standard output, or directory, which one?"));
1617                 if (mkdir(output_directory, 0777) < 0 && errno != EEXIST)
1618                         die_errno(_("Could not create directory '%s'"),
1619                                   output_directory);
1620         }
1621
1622         if (rev.pending.nr == 1) {
1623                 int check_head = 0;
1624
1625                 if (rev.max_count < 0 && !rev.show_root_diff) {
1626                         /*
1627                          * This is traditional behaviour of "git format-patch
1628                          * origin" that prepares what the origin side still
1629                          * does not have.
1630                          */
1631                         rev.pending.objects[0].item->flags |= UNINTERESTING;
1632                         add_head_to_pending(&rev);
1633                         check_head = 1;
1634                 }
1635                 /*
1636                  * Otherwise, it is "format-patch -22 HEAD", and/or
1637                  * "format-patch --root HEAD".  The user wants
1638                  * get_revision() to do the usual traversal.
1639                  */
1640
1641                 if (!strcmp(rev.pending.objects[0].name, "HEAD"))
1642                         check_head = 1;
1643
1644                 if (check_head) {
1645                         struct object_id oid;
1646                         const char *ref, *v;
1647                         ref = resolve_ref_unsafe("HEAD", RESOLVE_REF_READING,
1648                                                  oid.hash, NULL);
1649                         if (ref && skip_prefix(ref, "refs/heads/", &v))
1650                                 branch_name = xstrdup(v);
1651                         else
1652                                 branch_name = xstrdup(""); /* no branch */
1653                 }
1654         }
1655
1656         /*
1657          * We cannot move this anywhere earlier because we do want to
1658          * know if --root was given explicitly from the command line.
1659          */
1660         rev.show_root_diff = 1;
1661
1662         if (ignore_if_in_upstream) {
1663                 /* Don't say anything if head and upstream are the same. */
1664                 if (rev.pending.nr == 2) {
1665                         struct object_array_entry *o = rev.pending.objects;
1666                         if (oidcmp(&o[0].item->oid, &o[1].item->oid) == 0)
1667                                 return 0;
1668                 }
1669                 get_patch_ids(&rev, &ids);
1670         }
1671
1672         if (prepare_revision_walk(&rev))
1673                 die(_("revision walk setup failed"));
1674         rev.boundary = 1;
1675         while ((commit = get_revision(&rev)) != NULL) {
1676                 if (commit->object.flags & BOUNDARY) {
1677                         boundary_count++;
1678                         origin = (boundary_count == 1) ? commit : NULL;
1679                         continue;
1680                 }
1681
1682                 if (ignore_if_in_upstream && has_commit_patch_id(commit, &ids))
1683                         continue;
1684
1685                 nr++;
1686                 REALLOC_ARRAY(list, nr);
1687                 list[nr - 1] = commit;
1688         }
1689         if (nr == 0)
1690                 /* nothing to do */
1691                 return 0;
1692         total = nr;
1693         if (cover_letter == -1) {
1694                 if (config_cover_letter == COVER_AUTO)
1695                         cover_letter = (total > 1);
1696                 else
1697                         cover_letter = (config_cover_letter == COVER_ON);
1698         }
1699         if (!keep_subject && auto_number && (total > 1 || cover_letter))
1700                 numbered = 1;
1701         if (numbered)
1702                 rev.total = total + start_number - 1;
1703
1704         if (!signature) {
1705                 ; /* --no-signature inhibits all signatures */
1706         } else if (signature && signature != git_version_string) {
1707                 ; /* non-default signature already set */
1708         } else if (signature_file) {
1709                 struct strbuf buf = STRBUF_INIT;
1710
1711                 if (strbuf_read_file(&buf, signature_file, 128) < 0)
1712                         die_errno(_("unable to read signature file '%s'"), signature_file);
1713                 signature = strbuf_detach(&buf, NULL);
1714         }
1715
1716         memset(&bases, 0, sizeof(bases));
1717         if (base_commit || base_auto) {
1718                 struct commit *base = get_base_commit(base_commit, list, nr);
1719                 reset_revision_walk();
1720                 prepare_bases(&bases, base, list, nr);
1721         }
1722
1723         if (in_reply_to || thread || cover_letter)
1724                 rev.ref_message_ids = xcalloc(1, sizeof(struct string_list));
1725         if (in_reply_to) {
1726                 const char *msgid = clean_message_id(in_reply_to);
1727                 string_list_append(rev.ref_message_ids, msgid);
1728         }
1729         rev.numbered_files = just_numbers;
1730         rev.patch_suffix = fmt_patch_suffix;
1731         if (cover_letter) {
1732                 if (thread)
1733                         gen_message_id(&rev, "cover");
1734                 make_cover_letter(&rev, use_stdout,
1735                                   origin, nr, list, branch_name, quiet);
1736                 print_bases(&bases, rev.diffopt.file);
1737                 print_signature(rev.diffopt.file);
1738                 total++;
1739                 start_number--;
1740         }
1741         rev.add_signoff = do_signoff;
1742         while (0 <= --nr) {
1743                 int shown;
1744                 commit = list[nr];
1745                 rev.nr = total - nr + (start_number - 1);
1746                 /* Make the second and subsequent mails replies to the first */
1747                 if (thread) {
1748                         /* Have we already had a message ID? */
1749                         if (rev.message_id) {
1750                                 /*
1751                                  * For deep threading: make every mail
1752                                  * a reply to the previous one, no
1753                                  * matter what other options are set.
1754                                  *
1755                                  * For shallow threading:
1756                                  *
1757                                  * Without --cover-letter and
1758                                  * --in-reply-to, make every mail a
1759                                  * reply to the one before.
1760                                  *
1761                                  * With --in-reply-to but no
1762                                  * --cover-letter, make every mail a
1763                                  * reply to the <reply-to>.
1764                                  *
1765                                  * With --cover-letter, make every
1766                                  * mail but the cover letter a reply
1767                                  * to the cover letter.  The cover
1768                                  * letter is a reply to the
1769                                  * --in-reply-to, if specified.
1770                                  */
1771                                 if (thread == THREAD_SHALLOW
1772                                     && rev.ref_message_ids->nr > 0
1773                                     && (!cover_letter || rev.nr > 1))
1774                                         free(rev.message_id);
1775                                 else
1776                                         string_list_append(rev.ref_message_ids,
1777                                                            rev.message_id);
1778                         }
1779                         gen_message_id(&rev, oid_to_hex(&commit->object.oid));
1780                 }
1781
1782                 if (!use_stdout &&
1783                     open_next_file(rev.numbered_files ? NULL : commit, NULL, &rev, quiet))
1784                         die(_("Failed to create output files"));
1785                 shown = log_tree_commit(&rev, commit);
1786                 free_commit_buffer(commit);
1787
1788                 /* We put one extra blank line between formatted
1789                  * patches and this flag is used by log-tree code
1790                  * to see if it needs to emit a LF before showing
1791                  * the log; when using one file per patch, we do
1792                  * not want the extra blank line.
1793                  */
1794                 if (!use_stdout)
1795                         rev.shown_one = 0;
1796                 if (shown) {
1797                         print_bases(&bases, rev.diffopt.file);
1798                         if (rev.mime_boundary)
1799                                 fprintf(rev.diffopt.file, "\n--%s%s--\n\n\n",
1800                                        mime_boundary_leader,
1801                                        rev.mime_boundary);
1802                         else
1803                                 print_signature(rev.diffopt.file);
1804                 }
1805                 if (!use_stdout)
1806                         fclose(rev.diffopt.file);
1807         }
1808         free(list);
1809         free(branch_name);
1810         string_list_clear(&extra_to, 0);
1811         string_list_clear(&extra_cc, 0);
1812         string_list_clear(&extra_hdr, 0);
1813         if (ignore_if_in_upstream)
1814                 free_patch_ids(&ids);
1815         return 0;
1816 }
1817
1818 static int add_pending_commit(const char *arg, struct rev_info *revs, int flags)
1819 {
1820         struct object_id oid;
1821         if (get_oid(arg, &oid) == 0) {
1822                 struct commit *commit = lookup_commit_reference(oid.hash);
1823                 if (commit) {
1824                         commit->object.flags |= flags;
1825                         add_pending_object(revs, &commit->object, arg);
1826                         return 0;
1827                 }
1828         }
1829         return -1;
1830 }
1831
1832 static const char * const cherry_usage[] = {
1833         N_("git cherry [-v] [<upstream> [<head> [<limit>]]]"),
1834         NULL
1835 };
1836
1837 static void print_commit(char sign, struct commit *commit, int verbose,
1838                          int abbrev, FILE *file)
1839 {
1840         if (!verbose) {
1841                 fprintf(file, "%c %s\n", sign,
1842                        find_unique_abbrev(commit->object.oid.hash, abbrev));
1843         } else {
1844                 struct strbuf buf = STRBUF_INIT;
1845                 pp_commit_easy(CMIT_FMT_ONELINE, commit, &buf);
1846                 fprintf(file, "%c %s %s\n", sign,
1847                        find_unique_abbrev(commit->object.oid.hash, abbrev),
1848                        buf.buf);
1849                 strbuf_release(&buf);
1850         }
1851 }
1852
1853 int cmd_cherry(int argc, const char **argv, const char *prefix)
1854 {
1855         struct rev_info revs;
1856         struct patch_ids ids;
1857         struct commit *commit;
1858         struct commit_list *list = NULL;
1859         struct branch *current_branch;
1860         const char *upstream;
1861         const char *head = "HEAD";
1862         const char *limit = NULL;
1863         int verbose = 0, abbrev = 0;
1864
1865         struct option options[] = {
1866                 OPT__ABBREV(&abbrev),
1867                 OPT__VERBOSE(&verbose, N_("be verbose")),
1868                 OPT_END()
1869         };
1870
1871         argc = parse_options(argc, argv, prefix, options, cherry_usage, 0);
1872
1873         switch (argc) {
1874         case 3:
1875                 limit = argv[2];
1876                 /* FALLTHROUGH */
1877         case 2:
1878                 head = argv[1];
1879                 /* FALLTHROUGH */
1880         case 1:
1881                 upstream = argv[0];
1882                 break;
1883         default:
1884                 current_branch = branch_get(NULL);
1885                 upstream = branch_get_upstream(current_branch, NULL);
1886                 if (!upstream) {
1887                         fprintf(stderr, _("Could not find a tracked"
1888                                         " remote branch, please"
1889                                         " specify <upstream> manually.\n"));
1890                         usage_with_options(cherry_usage, options);
1891                 }
1892         }
1893
1894         init_revisions(&revs, prefix);
1895         revs.max_parents = 1;
1896
1897         if (add_pending_commit(head, &revs, 0))
1898                 die(_("Unknown commit %s"), head);
1899         if (add_pending_commit(upstream, &revs, UNINTERESTING))
1900                 die(_("Unknown commit %s"), upstream);
1901
1902         /* Don't say anything if head and upstream are the same. */
1903         if (revs.pending.nr == 2) {
1904                 struct object_array_entry *o = revs.pending.objects;
1905                 if (oidcmp(&o[0].item->oid, &o[1].item->oid) == 0)
1906                         return 0;
1907         }
1908
1909         get_patch_ids(&revs, &ids);
1910
1911         if (limit && add_pending_commit(limit, &revs, UNINTERESTING))
1912                 die(_("Unknown commit %s"), limit);
1913
1914         /* reverse the list of commits */
1915         if (prepare_revision_walk(&revs))
1916                 die(_("revision walk setup failed"));
1917         while ((commit = get_revision(&revs)) != NULL) {
1918                 commit_list_insert(commit, &list);
1919         }
1920
1921         while (list) {
1922                 char sign = '+';
1923
1924                 commit = list->item;
1925                 if (has_commit_patch_id(commit, &ids))
1926                         sign = '-';
1927                 print_commit(sign, commit, verbose, abbrev, revs.diffopt.file);
1928                 list = list->next;
1929         }
1930
1931         free_patch_ids(&ids);
1932         return 0;
1933 }