builtin/log.c

   1 /*
   2  * Builtin "git log" and related commands (show, whatchanged)
   3  *
   4  * (C) Copyright 2006 Linus Torvalds
   5  *               2006 Junio Hamano
   6  */
   7 #include "cache.h"
   8 #include "color.h"
   9 #include "commit.h"
  10 #include "diff.h"
  11 #include "revision.h"
  12 #include "log-tree.h"
  13 #include "builtin.h"
  14 #include "tag.h"
  15 #include "reflog-walk.h"
  16 #include "patch-ids.h"
  17 #include "run-command.h"
  18 #include "shortlog.h"
  19 #include "remote.h"
  20 #include "string-list.h"
  21 #include "parse-options.h"
  22 #include "line-log.h"
  23 #include "branch.h"
  24 #include "streaming.h"
  25 #include "version.h"
  26 #include "mailmap.h"
  27 #include "gpg-interface.h"
  28
  29 /* Set a default date-time format for git log ("log.date" config variable) */
  30 static const char *default_date_mode = NULL;
  31
  32 static int default_abbrev_commit;
  33 static int default_show_root = 1;
  34 static int decoration_style;
  35 static int decoration_given;
  36 static int use_mailmap_config;
  37 static const char *fmt_patch_subject_prefix = "PATCH";
  38 static const char *fmt_pretty;
  39
  40 static const char * const builtin_log_usage[] = {
  41         N_("git log [<options>] [<revision range>] [[--] <path>...]\n")
  42         N_("   or: git show [options] <object>..."),
  43         NULL
  44 };
  45
  46 struct line_opt_callback_data {
  47         struct rev_info *rev;
  48         const char *prefix;
  49         struct string_list args;
  50 };
  51
  52 static int parse_decoration_style(const char *var, const char *value)
  53 {
  54         switch (git_config_maybe_bool(var, value)) {
  55         case 1:
  56                 return DECORATE_SHORT_REFS;
  57         case 0:
  58                 return 0;
  59         default:
  60                 break;
  61         }
  62         if (!strcmp(value, "full"))
  63                 return DECORATE_FULL_REFS;
  64         else if (!strcmp(value, "short"))
  65                 return DECORATE_SHORT_REFS;
  66         return -1;
  67 }
  68
  69 static int decorate_callback(const struct option *opt, const char *arg, int unset)
  70 {
  71         if (unset)
  72                 decoration_style = 0;
  73         else if (arg)
  74                 decoration_style = parse_decoration_style("command line", arg);
  75         else
  76                 decoration_style = DECORATE_SHORT_REFS;
  77
  78         if (decoration_style < 0)
  79                 die("invalid --decorate option: %s", arg);
  80
  81         decoration_given = 1;
  82
  83         return 0;
  84 }
  85
  86 static int log_line_range_callback(const struct option *option, const char *arg, int unset)
  87 {
  88         struct line_opt_callback_data *data = option->value;
  89
  90         if (!arg)
  91                 return -1;
  92
  93         data->rev->line_level_traverse = 1;
  94         string_list_append(&data->args, arg);
  95
  96         return 0;
  97 }
  98
  99 static void cmd_log_init_defaults(struct rev_info *rev)
 100 {
 101         if (fmt_pretty)
 102                 get_commit_format(fmt_pretty, rev);
 103         rev->verbose_header = 1;
 104         DIFF_OPT_SET(&rev->diffopt, RECURSIVE);
 105         rev->diffopt.stat_width = -1; /* use full terminal width */
 106         rev->diffopt.stat_graph_width = -1; /* respect statGraphWidth config */
 107         rev->abbrev_commit = default_abbrev_commit;
 108         rev->show_root_diff = default_show_root;
 109         rev->subject_prefix = fmt_patch_subject_prefix;
 110         DIFF_OPT_SET(&rev->diffopt, ALLOW_TEXTCONV);
 111
 112         if (default_date_mode)
 113                 rev->date_mode = parse_date_format(default_date_mode);
 114         rev->diffopt.touched_flags = 0;
 115 }
 116
 117 static void cmd_log_init_finish(int argc, const char **argv, const char *prefix,
 118                          struct rev_info *rev, struct setup_revision_opt *opt)
 119 {
 120         struct userformat_want w;
 121         int quiet = 0, source = 0, mailmap = 0;
 122         static struct line_opt_callback_data line_cb = {NULL, NULL, STRING_LIST_INIT_DUP};
 123
 124         const struct option builtin_log_options[] = {
 125                 OPT__QUIET(&quiet, N_("suppress diff output")),
 126                 OPT_BOOL(0, "source", &source, N_("show source")),
 127                 OPT_BOOL(0, "use-mailmap", &mailmap, N_("Use mail map file")),
 128                 { OPTION_CALLBACK, 0, "decorate", NULL, NULL, N_("decorate options"),
 129                   PARSE_OPT_OPTARG, decorate_callback},
 130                 OPT_CALLBACK('L', NULL, &line_cb, "n,m:file",
 131                              "Process line range n,m in file, counting from 1",
 132                              log_line_range_callback),
 133                 OPT_END()
 134         };
 135
 136         line_cb.rev = rev;
 137         line_cb.prefix = prefix;
 138
 139         mailmap = use_mailmap_config;
 140         argc = parse_options(argc, argv, prefix,
 141                              builtin_log_options, builtin_log_usage,
 142                              PARSE_OPT_KEEP_ARGV0 | PARSE_OPT_KEEP_UNKNOWN |
 143                              PARSE_OPT_KEEP_DASHDASH);
 144
 145         if (quiet)
 146                 rev->diffopt.output_format |= DIFF_FORMAT_NO_OUTPUT;
 147         argc = setup_revisions(argc, argv, rev, opt);
 148
 149         /* Any arguments at this point are not recognized */
 150         if (argc > 1)
 151                 die("unrecognized argument: %s", argv[1]);
 152
 153         memset(&w, 0, sizeof(w));
 154         userformat_find_requirements(NULL, &w);
 155
 156         if (!rev->show_notes_given && (!rev->pretty_given || w.notes))
 157                 rev->show_notes = 1;
 158         if (rev->show_notes)
 159                 init_display_notes(&rev->notes_opt);
 160
 161         if (rev->diffopt.pickaxe || rev->diffopt.filter)
 162                 rev->always_show_header = 0;
 163         if (DIFF_OPT_TST(&rev->diffopt, FOLLOW_RENAMES)) {
 164                 rev->always_show_header = 0;
 165                 if (rev->diffopt.pathspec.nr != 1)
 166                         usage("git logs can only follow renames on one pathname at a time");
 167         }
 168
 169         if (source)
 170                 rev->show_source = 1;
 171
 172         if (mailmap) {
 173                 rev->mailmap = xcalloc(1, sizeof(struct string_list));
 174                 read_mailmap(rev->mailmap, NULL);
 175         }
 176
 177         if (rev->pretty_given && rev->commit_format == CMIT_FMT_RAW) {
 178                 /*
 179                  * "log --pretty=raw" is special; ignore UI oriented
 180                  * configuration variables such as decoration.
 181                  */
 182                 if (!decoration_given)
 183                         decoration_style = 0;
 184                 if (!rev->abbrev_commit_given)
 185                         rev->abbrev_commit = 0;
 186         }
 187
 188         if (decoration_style) {
 189                 rev->show_decorations = 1;
 190                 load_ref_decorations(decoration_style);
 191         }
 192
 193         if (rev->line_level_traverse)
 194                 line_log_init(rev, line_cb.prefix, &line_cb.args);
 195
 196         setup_pager();
 197 }
 198
 199 static void cmd_log_init(int argc, const char **argv, const char *prefix,
 200                          struct rev_info *rev, struct setup_revision_opt *opt)
 201 {
 202         cmd_log_init_defaults(rev);
 203         cmd_log_init_finish(argc, argv, prefix, rev, opt);
 204 }
 205
 206 /*
 207  * This gives a rough estimate for how many commits we
 208  * will print out in the list.
 209  */
 210 static int estimate_commit_count(struct rev_info *rev, struct commit_list *list)
 211 {
 212         int n = 0;
 213
 214         while (list) {
 215                 struct commit *commit = list->item;
 216                 unsigned int flags = commit->object.flags;
 217                 list = list->next;
 218                 if (!(flags & (TREESAME | UNINTERESTING)))
 219                         n++;
 220         }
 221         return n;
 222 }
 223
 224 static void show_early_header(struct rev_info *rev, const char *stage, int nr)
 225 {
 226         if (rev->shown_one) {
 227                 rev->shown_one = 0;
 228                 if (rev->commit_format != CMIT_FMT_ONELINE)
 229                         putchar(rev->diffopt.line_termination);
 230         }
 231         printf(_("Final output: %d %s\n"), nr, stage);
 232 }
 233
 234 static struct itimerval early_output_timer;
 235
 236 static void log_show_early(struct rev_info *revs, struct commit_list *list)
 237 {
 238         int i = revs->early_output;
 239         int show_header = 1;
 240
 241         sort_in_topological_order(&list, revs->sort_order);
 242         while (list && i) {
 243                 struct commit *commit = list->item;
 244                 switch (simplify_commit(revs, commit)) {
 245                 case commit_show:
 246                         if (show_header) {
 247                                 int n = estimate_commit_count(revs, list);
 248                                 show_early_header(revs, "incomplete", n);
 249                                 show_header = 0;
 250                         }
 251                         log_tree_commit(revs, commit);
 252                         i--;
 253                         break;
 254                 case commit_ignore:
 255                         break;
 256                 case commit_error:
 257                         return;
 258                 }
 259                 list = list->next;
 260         }
 261
 262         /* Did we already get enough commits for the early output? */
 263         if (!i)
 264                 return;
 265
 266         /*
 267          * ..if no, then repeat it twice a second until we
 268          * do.
 269          *
 270          * NOTE! We don't use "it_interval", because if the
 271          * reader isn't listening, we want our output to be
 272          * throttled by the writing, and not have the timer
 273          * trigger every second even if we're blocked on a
 274          * reader!
 275          */
 276         early_output_timer.it_value.tv_sec = 0;
 277         early_output_timer.it_value.tv_usec = 500000;
 278         setitimer(ITIMER_REAL, &early_output_timer, NULL);
 279 }
 280
 281 static void early_output(int signal)
 282 {
 283         show_early_output = log_show_early;
 284 }
 285
 286 static void setup_early_output(struct rev_info *rev)
 287 {
 288         struct sigaction sa;
 289
 290         /*
 291          * Set up the signal handler, minimally intrusively:
 292          * we only set a single volatile integer word (not
 293          * using sigatomic_t - trying to avoid unnecessary
 294          * system dependencies and headers), and using
 295          * SA_RESTART.
 296          */
 297         memset(&sa, 0, sizeof(sa));
 298         sa.sa_handler = early_output;
 299         sigemptyset(&sa.sa_mask);
 300         sa.sa_flags = SA_RESTART;
 301         sigaction(SIGALRM, &sa, NULL);
 302
 303         /*
 304          * If we can get the whole output in less than a
 305          * tenth of a second, don't even bother doing the
 306          * early-output thing..
 307          *
 308          * This is a one-time-only trigger.
 309          */
 310         early_output_timer.it_value.tv_sec = 0;
 311         early_output_timer.it_value.tv_usec = 100000;
 312         setitimer(ITIMER_REAL, &early_output_timer, NULL);
 313 }
 314
 315 static void finish_early_output(struct rev_info *rev)
 316 {
 317         int n = estimate_commit_count(rev, rev->commits);
 318         signal(SIGALRM, SIG_IGN);
 319         show_early_header(rev, "done", n);
 320 }
 321
 322 static int cmd_log_walk(struct rev_info *rev)
 323 {
 324         struct commit *commit;
 325         int saved_nrl = 0;
 326         int saved_dcctc = 0;
 327
 328         if (rev->early_output)
 329                 setup_early_output(rev);
 330
 331         if (prepare_revision_walk(rev))
 332                 die(_("revision walk setup failed"));
 333
 334         if (rev->early_output)
 335                 finish_early_output(rev);
 336
 337         /*
 338          * For --check and --exit-code, the exit code is based on CHECK_FAILED
 339          * and HAS_CHANGES being accumulated in rev->diffopt, so be careful to
 340          * retain that state information if replacing rev->diffopt in this loop
 341          */
 342         while ((commit = get_revision(rev)) != NULL) {
 343                 if (!log_tree_commit(rev, commit) &&
 344                     rev->max_count >= 0)
 345                         /*
 346                          * We decremented max_count in get_revision,
 347                          * but we didn't actually show the commit.
 348                          */
 349                         rev->max_count++;
 350                 if (!rev->reflog_info) {
 351                         /* we allow cycles in reflog ancestry */
 352                         free(commit->buffer);
 353                         commit->buffer = NULL;
 354                 }
 355                 free_commit_list(commit->parents);
 356                 commit->parents = NULL;
 357                 if (saved_nrl < rev->diffopt.needed_rename_limit)
 358                         saved_nrl = rev->diffopt.needed_rename_limit;
 359                 if (rev->diffopt.degraded_cc_to_c)
 360                         saved_dcctc = 1;
 361         }
 362         rev->diffopt.degraded_cc_to_c = saved_dcctc;
 363         rev->diffopt.needed_rename_limit = saved_nrl;
 364
 365         if (rev->diffopt.output_format & DIFF_FORMAT_CHECKDIFF &&
 366             DIFF_OPT_TST(&rev->diffopt, CHECK_FAILED)) {
 367                 return 02;
 368         }
 369         return diff_result_code(&rev->diffopt, 0);
 370 }
 371
 372 static int git_log_config(const char *var, const char *value, void *cb)
 373 {
 374         if (!strcmp(var, "format.pretty"))
 375                 return git_config_string(&fmt_pretty, var, value);
 376         if (!strcmp(var, "format.subjectprefix"))
 377                 return git_config_string(&fmt_patch_subject_prefix, var, value);
 378         if (!strcmp(var, "log.abbrevcommit")) {
 379                 default_abbrev_commit = git_config_bool(var, value);
 380                 return 0;
 381         }
 382         if (!strcmp(var, "log.date"))
 383                 return git_config_string(&default_date_mode, var, value);
 384         if (!strcmp(var, "log.decorate")) {
 385                 decoration_style = parse_decoration_style(var, value);
 386                 if (decoration_style < 0)
 387                         decoration_style = 0; /* maybe warn? */
 388                 return 0;
 389         }
 390         if (!strcmp(var, "log.showroot")) {
 391                 default_show_root = git_config_bool(var, value);
 392                 return 0;
 393         }
 394         if (!prefixcmp(var, "color.decorate."))
 395                 return parse_decorate_color_config(var, 15, value);
 396         if (!strcmp(var, "log.mailmap")) {
 397                 use_mailmap_config = git_config_bool(var, value);
 398                 return 0;
 399         }
 400
 401         if (grep_config(var, value, cb) < 0)
 402                 return -1;
 403         if (git_gpg_config(var, value, cb) < 0)
 404                 return -1;
 405         return git_diff_ui_config(var, value, cb);
 406 }
 407
 408 int cmd_whatchanged(int argc, const char **argv, const char *prefix)
 409 {
 410         struct rev_info rev;
 411         struct setup_revision_opt opt;
 412
 413         init_grep_defaults();
 414         git_config(git_log_config, NULL);
 415
 416         init_revisions(&rev, prefix);
 417         rev.diff = 1;
 418         rev.simplify_history = 0;
 419         memset(&opt, 0, sizeof(opt));
 420         opt.def = "HEAD";
 421         opt.revarg_opt = REVARG_COMMITTISH;
 422         cmd_log_init(argc, argv, prefix, &rev, &opt);
 423         if (!rev.diffopt.output_format)
 424                 rev.diffopt.output_format = DIFF_FORMAT_RAW;
 425         return cmd_log_walk(&rev);
 426 }
 427
 428 static void show_tagger(char *buf, int len, struct rev_info *rev)
 429 {
 430         struct strbuf out = STRBUF_INIT;
 431         struct pretty_print_context pp = {0};
 432
 433         pp.fmt = rev->commit_format;
 434         pp.date_mode = rev->date_mode;
 435         pp_user_info(&pp, "Tagger", &out, buf, get_log_output_encoding());
 436         printf("%s", out.buf);
 437         strbuf_release(&out);
 438 }
 439
 440 static int show_blob_object(const unsigned char *sha1, struct rev_info *rev, const char *obj_name)
 441 {
 442         unsigned char sha1c[20];
 443         struct object_context obj_context;
 444         char *buf;
 445         unsigned long size;
 446
 447         fflush(stdout);
 448         if (!DIFF_OPT_TOUCHED(&rev->diffopt, ALLOW_TEXTCONV) ||
 449             !DIFF_OPT_TST(&rev->diffopt, ALLOW_TEXTCONV))
 450                 return stream_blob_to_fd(1, sha1, NULL, 0);
 451
 452         if (get_sha1_with_context(obj_name, 0, sha1c, &obj_context))
 453                 die("Not a valid object name %s", obj_name);
 454         if (!obj_context.path[0] ||
 455             !textconv_object(obj_context.path, obj_context.mode, sha1c, 1, &buf, &size))
 456                 return stream_blob_to_fd(1, sha1, NULL, 0);
 457
 458         if (!buf)
 459                 die("git show %s: bad file", obj_name);
 460
 461         write_or_die(1, buf, size);
 462         return 0;
 463 }
 464
 465 static int show_tag_object(const unsigned char *sha1, struct rev_info *rev)
 466 {
 467         unsigned long size;
 468         enum object_type type;
 469         char *buf = read_sha1_file(sha1, &type, &size);
 470         int offset = 0;
 471
 472         if (!buf)
 473                 return error(_("Could not read object %s"), sha1_to_hex(sha1));
 474
 475         assert(type == OBJ_TAG);
 476         while (offset < size && buf[offset] != '\n') {
 477                 int new_offset = offset + 1;
 478                 while (new_offset < size && buf[new_offset++] != '\n')
 479                         ; /* do nothing */
 480                 if (!prefixcmp(buf + offset, "tagger "))
 481                         show_tagger(buf + offset + 7,
 482                                     new_offset - offset - 7, rev);
 483                 offset = new_offset;
 484         }
 485
 486         if (offset < size)
 487                 fwrite(buf + offset, size - offset, 1, stdout);
 488         free(buf);
 489         return 0;
 490 }
 491
 492 static int show_tree_object(const unsigned char *sha1,
 493                 const char *base, int baselen,
 494                 const char *pathname, unsigned mode, int stage, void *context)
 495 {
 496         printf("%s%s\n", pathname, S_ISDIR(mode) ? "/" : "");
 497         return 0;
 498 }
 499
 500 static void show_rev_tweak_rev(struct rev_info *rev, struct setup_revision_opt *opt)
 501 {
 502         if (rev->ignore_merges) {
 503                 /* There was no "-m" on the command line */
 504                 rev->ignore_merges = 0;
 505                 if (!rev->first_parent_only && !rev->combine_merges) {
 506                         /* No "--first-parent", "-c", nor "--cc" */
 507                         rev->combine_merges = 1;
 508                         rev->dense_combined_merges = 1;
 509                 }
 510         }
 511         if (!rev->diffopt.output_format)
 512                 rev->diffopt.output_format = DIFF_FORMAT_PATCH;
 513 }
 514
 515 int cmd_show(int argc, const char **argv, const char *prefix)
 516 {
 517         struct rev_info rev;
 518         struct object_array_entry *objects;
 519         struct setup_revision_opt opt;
 520         struct pathspec match_all;
 521         int i, count, ret = 0;
 522
 523         init_grep_defaults();
 524         git_config(git_log_config, NULL);
 525
 526         memset(&match_all, 0, sizeof(match_all));
 527         init_revisions(&rev, prefix);
 528         rev.diff = 1;
 529         rev.always_show_header = 1;
 530         rev.no_walk = REVISION_WALK_NO_WALK_SORTED;
 531         rev.diffopt.stat_width = -1;    /* Scale to real terminal size */
 532
 533         memset(&opt, 0, sizeof(opt));
 534         opt.def = "HEAD";
 535         opt.tweak = show_rev_tweak_rev;
 536         cmd_log_init(argc, argv, prefix, &rev, &opt);
 537
 538         if (!rev.no_walk)
 539                 return cmd_log_walk(&rev);
 540
 541         count = rev.pending.nr;
 542         objects = rev.pending.objects;
 543         for (i = 0; i < count && !ret; i++) {
 544                 struct object *o = objects[i].item;
 545                 const char *name = objects[i].name;
 546                 switch (o->type) {
 547                 case OBJ_BLOB:
 548                         ret = show_blob_object(o->sha1, &rev, name);
 549                         break;
 550                 case OBJ_TAG: {
 551                         struct tag *t = (struct tag *)o;
 552
 553                         if (rev.shown_one)
 554                                 putchar('\n');
 555                         printf("%stag %s%s\n",
 556                                         diff_get_color_opt(&rev.diffopt, DIFF_COMMIT),
 557                                         t->tag,
 558                                         diff_get_color_opt(&rev.diffopt, DIFF_RESET));
 559                         ret = show_tag_object(o->sha1, &rev);
 560                         rev.shown_one = 1;
 561                         if (ret)
 562                                 break;
 563                         o = parse_object(t->tagged->sha1);
 564                         if (!o)
 565                                 ret = error(_("Could not read object %s"),
 566                                             sha1_to_hex(t->tagged->sha1));
 567                         objects[i].item = o;
 568                         i--;
 569                         break;
 570                 }
 571                 case OBJ_TREE:
 572                         if (rev.shown_one)
 573                                 putchar('\n');
 574                         printf("%stree %s%s\n\n",
 575                                         diff_get_color_opt(&rev.diffopt, DIFF_COMMIT),
 576                                         name,
 577                                         diff_get_color_opt(&rev.diffopt, DIFF_RESET));
 578                         read_tree_recursive((struct tree *)o, "", 0, 0, &match_all,
 579                                         show_tree_object, NULL);
 580                         rev.shown_one = 1;
 581                         break;
 582                 case OBJ_COMMIT:
 583                         rev.pending.nr = rev.pending.alloc = 0;
 584                         rev.pending.objects = NULL;
 585                         add_object_array(o, name, &rev.pending);
 586                         ret = cmd_log_walk(&rev);
 587                         break;
 588                 default:
 589                         ret = error(_("Unknown type: %d"), o->type);
 590                 }
 591         }
 592         free(objects);
 593         return ret;
 594 }
 595
 596 /*
 597  * This is equivalent to "git log -g --abbrev-commit --pretty=oneline"
 598  */
 599 int cmd_log_reflog(int argc, const char **argv, const char *prefix)
 600 {
 601         struct rev_info rev;
 602         struct setup_revision_opt opt;
 603
 604         init_grep_defaults();
 605         git_config(git_log_config, NULL);
 606
 607         init_revisions(&rev, prefix);
 608         init_reflog_walk(&rev.reflog_info);
 609         rev.verbose_header = 1;
 610         memset(&opt, 0, sizeof(opt));
 611         opt.def = "HEAD";
 612         cmd_log_init_defaults(&rev);
 613         rev.abbrev_commit = 1;
 614         rev.commit_format = CMIT_FMT_ONELINE;
 615         rev.use_terminator = 1;
 616         rev.always_show_header = 1;
 617         cmd_log_init_finish(argc, argv, prefix, &rev, &opt);
 618
 619         return cmd_log_walk(&rev);
 620 }
 621
 622 int cmd_log(int argc, const char **argv, const char *prefix)
 623 {
 624         struct rev_info rev;
 625         struct setup_revision_opt opt;
 626
 627         init_grep_defaults();
 628         git_config(git_log_config, NULL);
 629
 630         init_revisions(&rev, prefix);
 631         rev.always_show_header = 1;
 632         memset(&opt, 0, sizeof(opt));
 633         opt.def = "HEAD";
 634         opt.revarg_opt = REVARG_COMMITTISH;
 635         cmd_log_init(argc, argv, prefix, &rev, &opt);
 636         return cmd_log_walk(&rev);
 637 }
 638
 639 /* format-patch */
 640
 641 static const char *fmt_patch_suffix = ".patch";
 642 static int numbered = 0;
 643 static int auto_number = 1;
 644
 645 static char *default_attach = NULL;
 646
 647 static struct string_list extra_hdr;
 648 static struct string_list extra_to;
 649 static struct string_list extra_cc;
 650
 651 static void add_header(const char *value)
 652 {
 653         struct string_list_item *item;
 654         int len = strlen(value);
 655         while (len && value[len - 1] == '\n')
 656                 len--;
 657
 658         if (!strncasecmp(value, "to: ", 4)) {
 659                 item = string_list_append(&extra_to, value + 4);
 660                 len -= 4;
 661         } else if (!strncasecmp(value, "cc: ", 4)) {
 662                 item = string_list_append(&extra_cc, value + 4);
 663                 len -= 4;
 664         } else {
 665                 item = string_list_append(&extra_hdr, value);
 666         }
 667
 668         item->string[len] = '\0';
 669 }
 670
 671 #define THREAD_SHALLOW 1
 672 #define THREAD_DEEP 2
 673 static int thread;
 674 static int do_signoff;
 675 static const char *signature = git_version_string;
 676 static int config_cover_letter;
 677
 678 enum {
 679         COVER_UNSET,
 680         COVER_OFF,
 681         COVER_ON,
 682         COVER_AUTO
 683 };
 684
 685 static int git_format_config(const char *var, const char *value, void *cb)
 686 {
 687         if (!strcmp(var, "format.headers")) {
 688                 if (!value)
 689                         die(_("format.headers without value"));
 690                 add_header(value);
 691                 return 0;
 692         }
 693         if (!strcmp(var, "format.suffix"))
 694                 return git_config_string(&fmt_patch_suffix, var, value);
 695         if (!strcmp(var, "format.to")) {
 696                 if (!value)
 697                         return config_error_nonbool(var);
 698                 string_list_append(&extra_to, value);
 699                 return 0;
 700         }
 701         if (!strcmp(var, "format.cc")) {
 702                 if (!value)
 703                         return config_error_nonbool(var);
 704                 string_list_append(&extra_cc, value);
 705                 return 0;
 706         }
 707         if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff") ||
 708             !strcmp(var, "color.ui")) {
 709                 return 0;
 710         }
 711         if (!strcmp(var, "format.numbered")) {
 712                 if (value && !strcasecmp(value, "auto")) {
 713                         auto_number = 1;
 714                         return 0;
 715                 }
 716                 numbered = git_config_bool(var, value);
 717                 auto_number = auto_number && numbered;
 718                 return 0;
 719         }
 720         if (!strcmp(var, "format.attach")) {
 721                 if (value && *value)
 722                         default_attach = xstrdup(value);
 723                 else
 724                         default_attach = xstrdup(git_version_string);
 725                 return 0;
 726         }
 727         if (!strcmp(var, "format.thread")) {
 728                 if (value && !strcasecmp(value, "deep")) {
 729                         thread = THREAD_DEEP;
 730                         return 0;
 731                 }
 732                 if (value && !strcasecmp(value, "shallow")) {
 733                         thread = THREAD_SHALLOW;
 734                         return 0;
 735                 }
 736                 thread = git_config_bool(var, value) && THREAD_SHALLOW;
 737                 return 0;
 738         }
 739         if (!strcmp(var, "format.signoff")) {
 740                 do_signoff = git_config_bool(var, value);
 741                 return 0;
 742         }
 743         if (!strcmp(var, "format.signature"))
 744                 return git_config_string(&signature, var, value);
 745         if (!strcmp(var, "format.coverletter")) {
 746                 if (value && !strcasecmp(value, "auto")) {
 747                         config_cover_letter = COVER_AUTO;
 748                         return 0;
 749                 }
 750                 config_cover_letter = git_config_bool(var, value) ? COVER_ON : COVER_OFF;
 751                 return 0;
 752         }
 753
 754         return git_log_config(var, value, cb);
 755 }
 756
 757 static FILE *realstdout = NULL;
 758 static const char *output_directory = NULL;
 759 static int outdir_offset;
 760
 761 static int reopen_stdout(struct commit *commit, const char *subject,
 762                          struct rev_info *rev, int quiet)
 763 {
 764         struct strbuf filename = STRBUF_INIT;
 765         int suffix_len = strlen(rev->patch_suffix) + 1;
 766
 767         if (output_directory) {
 768                 strbuf_addstr(&filename, output_directory);
 769                 if (filename.len >=
 770                     PATH_MAX - FORMAT_PATCH_NAME_MAX - suffix_len)
 771                         return error(_("name of output directory is too long"));
 772                 if (filename.buf[filename.len - 1] != '/')
 773                         strbuf_addch(&filename, '/');
 774         }
 775
 776         if (rev->numbered_files)
 777                 strbuf_addf(&filename, "%d", rev->nr);
 778         else if (commit)
 779                 fmt_output_commit(&filename, commit, rev);
 780         else
 781                 fmt_output_subject(&filename, subject, rev);
 782
 783         if (!quiet)
 784                 fprintf(realstdout, "%s\n", filename.buf + outdir_offset);
 785
 786         if (freopen(filename.buf, "w", stdout) == NULL)
 787                 return error(_("Cannot open patch file %s"), filename.buf);
 788
 789         strbuf_release(&filename);
 790         return 0;
 791 }
 792
 793 static void get_patch_ids(struct rev_info *rev, struct patch_ids *ids)
 794 {
 795         struct rev_info check_rev;
 796         struct commit *commit;
 797         struct object *o1, *o2;
 798         unsigned flags1, flags2;
 799
 800         if (rev->pending.nr != 2)
 801                 die(_("Need exactly one range."));
 802
 803         o1 = rev->pending.objects[0].item;
 804         flags1 = o1->flags;
 805         o2 = rev->pending.objects[1].item;
 806         flags2 = o2->flags;
 807
 808         if ((flags1 & UNINTERESTING) == (flags2 & UNINTERESTING))
 809                 die(_("Not a range."));
 810
 811         init_patch_ids(ids);
 812
 813         /* given a range a..b get all patch ids for b..a */
 814         init_revisions(&check_rev, rev->prefix);
 815         check_rev.max_parents = 1;
 816         o1->flags ^= UNINTERESTING;
 817         o2->flags ^= UNINTERESTING;
 818         add_pending_object(&check_rev, o1, "o1");
 819         add_pending_object(&check_rev, o2, "o2");
 820         if (prepare_revision_walk(&check_rev))
 821                 die(_("revision walk setup failed"));
 822
 823         while ((commit = get_revision(&check_rev)) != NULL) {
 824                 add_commit_patch_id(commit, ids);
 825         }
 826
 827         /* reset for next revision walk */
 828         clear_commit_marks((struct commit *)o1,
 829                         SEEN | UNINTERESTING | SHOWN | ADDED);
 830         clear_commit_marks((struct commit *)o2,
 831                         SEEN | UNINTERESTING | SHOWN | ADDED);
 832         o1->flags = flags1;
 833         o2->flags = flags2;
 834 }
 835
 836 static void gen_message_id(struct rev_info *info, char *base)
 837 {
 838         struct strbuf buf = STRBUF_INIT;
 839         strbuf_addf(&buf, "%s.%lu.git.%s", base,
 840                     (unsigned long) time(NULL),
 841                     git_committer_info(IDENT_NO_NAME|IDENT_NO_DATE|IDENT_STRICT));
 842         info->message_id = strbuf_detach(&buf, NULL);
 843 }
 844
 845 static void print_signature(void)
 846 {
 847         if (signature && *signature)
 848                 printf("-- \n%s\n\n", signature);
 849 }
 850
 851 static void add_branch_description(struct strbuf *buf, const char *branch_name)
 852 {
 853         struct strbuf desc = STRBUF_INIT;
 854         if (!branch_name || !*branch_name)
 855                 return;
 856         read_branch_desc(&desc, branch_name);
 857         if (desc.len) {
 858                 strbuf_addch(buf, '\n');
 859                 strbuf_add(buf, desc.buf, desc.len);
 860                 strbuf_addch(buf, '\n');
 861         }
 862 }
 863
 864 static char *find_branch_name(struct rev_info *rev)
 865 {
 866         int i, positive = -1;
 867         unsigned char branch_sha1[20];
 868         const unsigned char *tip_sha1;
 869         const char *ref;
 870         char *full_ref, *branch = NULL;
 871
 872         for (i = 0; i < rev->cmdline.nr; i++) {
 873                 if (rev->cmdline.rev[i].flags & UNINTERESTING)
 874                         continue;
 875                 if (positive < 0)
 876                         positive = i;
 877                 else
 878                         return NULL;
 879         }
 880         if (positive < 0)
 881                 return NULL;
 882         ref = rev->cmdline.rev[positive].name;
 883         tip_sha1 = rev->cmdline.rev[positive].item->sha1;
 884         if (dwim_ref(ref, strlen(ref), branch_sha1, &full_ref) &&
 885             !prefixcmp(full_ref, "refs/heads/") &&
 886             !hashcmp(tip_sha1, branch_sha1))
 887                 branch = xstrdup(full_ref + strlen("refs/heads/"));
 888         free(full_ref);
 889         return branch;
 890 }
 891
 892 static void make_cover_letter(struct rev_info *rev, int use_stdout,
 893                               struct commit *origin,
 894                               int nr, struct commit **list,
 895                               const char *branch_name,
 896                               int quiet)
 897 {
 898         const char *committer;
 899         const char *body = "*** SUBJECT HERE ***\n\n*** BLURB HERE ***\n";
 900         const char *msg;
 901         struct shortlog log;
 902         struct strbuf sb = STRBUF_INIT;
 903         int i;
 904         const char *encoding = "UTF-8";
 905         struct diff_options opts;
 906         int need_8bit_cte = 0;
 907         struct pretty_print_context pp = {0};
 908         struct commit *head = list[0];
 909
 910         if (rev->commit_format != CMIT_FMT_EMAIL)
 911                 die(_("Cover letter needs email format"));
 912
 913         committer = git_committer_info(0);
 914
 915         if (!use_stdout &&
 916             reopen_stdout(NULL, rev->numbered_files ? NULL : "cover-letter", rev, quiet))
 917                 return;
 918
 919         log_write_email_headers(rev, head, &pp.subject, &pp.after_subject,
 920                                 &need_8bit_cte);
 921
 922         for (i = 0; !need_8bit_cte && i < nr; i++)
 923                 if (has_non_ascii(list[i]->buffer))
 924                         need_8bit_cte = 1;
 925
 926         if (!branch_name)
 927                 branch_name = find_branch_name(rev);
 928
 929         msg = body;
 930         pp.fmt = CMIT_FMT_EMAIL;
 931         pp.date_mode = DATE_RFC2822;
 932         pp_user_info(&pp, NULL, &sb, committer, encoding);
 933         pp_title_line(&pp, &msg, &sb, encoding, need_8bit_cte);
 934         pp_remainder(&pp, &msg, &sb, 0);
 935         add_branch_description(&sb, branch_name);
 936         printf("%s\n", sb.buf);
 937
 938         strbuf_release(&sb);
 939
 940         shortlog_init(&log);
 941         log.wrap_lines = 1;
 942         log.wrap = 72;
 943         log.in1 = 2;
 944         log.in2 = 4;
 945         for (i = 0; i < nr; i++)
 946                 shortlog_add_commit(&log, list[i]);
 947
 948         shortlog_output(&log);
 949
 950         /*
 951          * We can only do diffstat with a unique reference point
 952          */
 953         if (!origin)
 954                 return;
 955
 956         memcpy(&opts, &rev->diffopt, sizeof(opts));
 957         opts.output_format = DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT;
 958
 959         diff_setup_done(&opts);
 960
 961         diff_tree_sha1(origin->tree->object.sha1,
 962                        head->tree->object.sha1,
 963                        "", &opts);
 964         diffcore_std(&opts);
 965         diff_flush(&opts);
 966
 967         printf("\n");
 968         print_signature();
 969 }
 970
 971 static const char *clean_message_id(const char *msg_id)
 972 {
 973         char ch;
 974         const char *a, *z, *m;
 975
 976         m = msg_id;
 977         while ((ch = *m) && (isspace(ch) || (ch == '<')))
 978                 m++;
 979         a = m;
 980         z = NULL;
 981         while ((ch = *m)) {
 982                 if (!isspace(ch) && (ch != '>'))
 983                         z = m;
 984                 m++;
 985         }
 986         if (!z)
 987                 die(_("insane in-reply-to: %s"), msg_id);
 988         if (++z == m)
 989                 return a;
 990         return xmemdupz(a, z - a);
 991 }
 992
 993 static const char *set_outdir(const char *prefix, const char *output_directory)
 994 {
 995         if (output_directory && is_absolute_path(output_directory))
 996                 return output_directory;
 997
 998         if (!prefix || !*prefix) {
 999                 if (output_directory)
1000                         return output_directory;
1001                 /* The user did not explicitly ask for "./" */
1002                 outdir_offset = 2;
1003                 return "./";
1004         }
1005
1006         outdir_offset = strlen(prefix);
1007         if (!output_directory)
1008                 return prefix;
1009
1010         return xstrdup(prefix_filename(prefix, outdir_offset,
1011                                        output_directory));
1012 }
1013
1014 static const char * const builtin_format_patch_usage[] = {
1015         N_("git format-patch [options] [<since> | <revision range>]"),
1016         NULL
1017 };
1018
1019 static int keep_subject = 0;
1020
1021 static int keep_callback(const struct option *opt, const char *arg, int unset)
1022 {
1023         ((struct rev_info *)opt->value)->total = -1;
1024         keep_subject = 1;
1025         return 0;
1026 }
1027
1028 static int subject_prefix = 0;
1029
1030 static int subject_prefix_callback(const struct option *opt, const char *arg,
1031                             int unset)
1032 {
1033         subject_prefix = 1;
1034         ((struct rev_info *)opt->value)->subject_prefix = arg;
1035         return 0;
1036 }
1037
1038 static int numbered_cmdline_opt = 0;
1039
1040 static int numbered_callback(const struct option *opt, const char *arg,
1041                              int unset)
1042 {
1043         *(int *)opt->value = numbered_cmdline_opt = unset ? 0 : 1;
1044         if (unset)
1045                 auto_number =  0;
1046         return 0;
1047 }
1048
1049 static int no_numbered_callback(const struct option *opt, const char *arg,
1050                                 int unset)
1051 {
1052         return numbered_callback(opt, arg, 1);
1053 }
1054
1055 static int output_directory_callback(const struct option *opt, const char *arg,
1056                               int unset)
1057 {
1058         const char **dir = (const char **)opt->value;
1059         if (*dir)
1060                 die(_("Two output directories?"));
1061         *dir = arg;
1062         return 0;
1063 }
1064
1065 static int thread_callback(const struct option *opt, const char *arg, int unset)
1066 {
1067         int *thread = (int *)opt->value;
1068         if (unset)
1069                 *thread = 0;
1070         else if (!arg || !strcmp(arg, "shallow"))
1071                 *thread = THREAD_SHALLOW;
1072         else if (!strcmp(arg, "deep"))
1073                 *thread = THREAD_DEEP;
1074         else
1075                 return 1;
1076         return 0;
1077 }
1078
1079 static int attach_callback(const struct option *opt, const char *arg, int unset)
1080 {
1081         struct rev_info *rev = (struct rev_info *)opt->value;
1082         if (unset)
1083                 rev->mime_boundary = NULL;
1084         else if (arg)
1085                 rev->mime_boundary = arg;
1086         else
1087                 rev->mime_boundary = git_version_string;
1088         rev->no_inline = unset ? 0 : 1;
1089         return 0;
1090 }
1091
1092 static int inline_callback(const struct option *opt, const char *arg, int unset)
1093 {
1094         struct rev_info *rev = (struct rev_info *)opt->value;
1095         if (unset)
1096                 rev->mime_boundary = NULL;
1097         else if (arg)
1098                 rev->mime_boundary = arg;
1099         else
1100                 rev->mime_boundary = git_version_string;
1101         rev->no_inline = 0;
1102         return 0;
1103 }
1104
1105 static int header_callback(const struct option *opt, const char *arg, int unset)
1106 {
1107         if (unset) {
1108                 string_list_clear(&extra_hdr, 0);
1109                 string_list_clear(&extra_to, 0);
1110                 string_list_clear(&extra_cc, 0);
1111         } else {
1112             add_header(arg);
1113         }
1114         return 0;
1115 }
1116
1117 static int to_callback(const struct option *opt, const char *arg, int unset)
1118 {
1119         if (unset)
1120                 string_list_clear(&extra_to, 0);
1121         else
1122                 string_list_append(&extra_to, arg);
1123         return 0;
1124 }
1125
1126 static int cc_callback(const struct option *opt, const char *arg, int unset)
1127 {
1128         if (unset)
1129                 string_list_clear(&extra_cc, 0);
1130         else
1131                 string_list_append(&extra_cc, arg);
1132         return 0;
1133 }
1134
1135 static int from_callback(const struct option *opt, const char *arg, int unset)
1136 {
1137         char **from = opt->value;
1138
1139         free(*from);
1140
1141         if (unset)
1142                 *from = NULL;
1143         else if (arg)
1144                 *from = xstrdup(arg);
1145         else
1146                 *from = xstrdup(git_committer_info(IDENT_NO_DATE));
1147         return 0;
1148 }
1149
1150 int cmd_format_patch(int argc, const char **argv, const char *prefix)
1151 {
1152         struct commit *commit;
1153         struct commit **list = NULL;
1154         struct rev_info rev;
1155         struct setup_revision_opt s_r_opt;
1156         int nr = 0, total, i;
1157         int use_stdout = 0;
1158         int start_number = -1;
1159         int just_numbers = 0;
1160         int ignore_if_in_upstream = 0;
1161         int cover_letter = -1;
1162         int boundary_count = 0;
1163         int no_binary_diff = 0;
1164         struct commit *origin = NULL;
1165         const char *in_reply_to = NULL;
1166         struct patch_ids ids;
1167         struct strbuf buf = STRBUF_INIT;
1168         int use_patch_format = 0;
1169         int quiet = 0;
1170         int reroll_count = -1;
1171         char *branch_name = NULL;
1172         char *from = NULL;
1173         const struct option builtin_format_patch_options[] = {
1174                 { OPTION_CALLBACK, 'n', "numbered", &numbered, NULL,
1175                             N_("use [PATCH n/m] even with a single patch"),
1176                             PARSE_OPT_NOARG, numbered_callback },
1177                 { OPTION_CALLBACK, 'N', "no-numbered", &numbered, NULL,
1178                             N_("use [PATCH] even with multiple patches"),
1179                             PARSE_OPT_NOARG, no_numbered_callback },
1180                 OPT_BOOL('s', "signoff", &do_signoff, N_("add Signed-off-by:")),
1181                 OPT_BOOL(0, "stdout", &use_stdout,
1182                             N_("print patches to standard out")),
1183                 OPT_BOOL(0, "cover-letter", &cover_letter,
1184                             N_("generate a cover letter")),
1185                 OPT_BOOL(0, "numbered-files", &just_numbers,
1186                             N_("use simple number sequence for output file names")),
1187                 OPT_STRING(0, "suffix", &fmt_patch_suffix, N_("sfx"),
1188                             N_("use <sfx> instead of '.patch'")),
1189                 OPT_INTEGER(0, "start-number", &start_number,
1190                             N_("start numbering patches at <n> instead of 1")),
1191                 OPT_INTEGER('v', "reroll-count", &reroll_count,
1192                             N_("mark the series as Nth re-roll")),
1193                 { OPTION_CALLBACK, 0, "subject-prefix", &rev, N_("prefix"),
1194                             N_("Use [<prefix>] instead of [PATCH]"),
1195                             PARSE_OPT_NONEG, subject_prefix_callback },
1196                 { OPTION_CALLBACK, 'o', "output-directory", &output_directory,
1197                             N_("dir"), N_("store resulting files in <dir>"),
1198                             PARSE_OPT_NONEG, output_directory_callback },
1199                 { OPTION_CALLBACK, 'k', "keep-subject", &rev, NULL,
1200                             N_("don't strip/add [PATCH]"),
1201                             PARSE_OPT_NOARG | PARSE_OPT_NONEG, keep_callback },
1202                 OPT_BOOL(0, "no-binary", &no_binary_diff,
1203                          N_("don't output binary diffs")),
1204                 OPT_BOOL(0, "ignore-if-in-upstream", &ignore_if_in_upstream,
1205                          N_("don't include a patch matching a commit upstream")),
1206                 { OPTION_SET_INT, 'p', "no-stat", &use_patch_format, NULL,
1207                   N_("show patch format instead of default (patch + stat)"),
1208                   PARSE_OPT_NONEG | PARSE_OPT_NOARG, NULL, 1},
1209                 OPT_GROUP(N_("Messaging")),
1210                 { OPTION_CALLBACK, 0, "add-header", NULL, N_("header"),
1211                             N_("add email header"), 0, header_callback },
1212                 { OPTION_CALLBACK, 0, "to", NULL, N_("email"), N_("add To: header"),
1213                             0, to_callback },
1214                 { OPTION_CALLBACK, 0, "cc", NULL, N_("email"), N_("add Cc: header"),
1215                             0, cc_callback },
1216                 { OPTION_CALLBACK, 0, "from", &from, N_("ident"),
1217                             N_("set From address to <ident> (or committer ident if absent)"),
1218                             PARSE_OPT_OPTARG, from_callback },
1219                 OPT_STRING(0, "in-reply-to", &in_reply_to, N_("message-id"),
1220                             N_("make first mail a reply to <message-id>")),
1221                 { OPTION_CALLBACK, 0, "attach", &rev, N_("boundary"),
1222                             N_("attach the patch"), PARSE_OPT_OPTARG,
1223                             attach_callback },
1224                 { OPTION_CALLBACK, 0, "inline", &rev, N_("boundary"),
1225                             N_("inline the patch"),
1226                             PARSE_OPT_OPTARG | PARSE_OPT_NONEG,
1227                             inline_callback },
1228                 { OPTION_CALLBACK, 0, "thread", &thread, N_("style"),
1229                             N_("enable message threading, styles: shallow, deep"),
1230                             PARSE_OPT_OPTARG, thread_callback },
1231                 OPT_STRING(0, "signature", &signature, N_("signature"),
1232                             N_("add a signature")),
1233                 OPT__QUIET(&quiet, N_("don't print the patch filenames")),
1234                 OPT_END()
1235         };
1236
1237         extra_hdr.strdup_strings = 1;
1238         extra_to.strdup_strings = 1;
1239         extra_cc.strdup_strings = 1;
1240         init_grep_defaults();
1241         git_config(git_format_config, NULL);
1242         init_revisions(&rev, prefix);
1243         rev.commit_format = CMIT_FMT_EMAIL;
1244         rev.verbose_header = 1;
1245         rev.diff = 1;
1246         rev.max_parents = 1;
1247         DIFF_OPT_SET(&rev.diffopt, RECURSIVE);
1248         rev.subject_prefix = fmt_patch_subject_prefix;
1249         memset(&s_r_opt, 0, sizeof(s_r_opt));
1250         s_r_opt.def = "HEAD";
1251         s_r_opt.revarg_opt = REVARG_COMMITTISH;
1252
1253         if (default_attach) {
1254                 rev.mime_boundary = default_attach;
1255                 rev.no_inline = 1;
1256         }
1257
1258         /*
1259          * Parse the arguments before setup_revisions(), or something
1260          * like "git format-patch -o a123 HEAD^.." may fail; a123 is
1261          * possibly a valid SHA1.
1262          */
1263         argc = parse_options(argc, argv, prefix, builtin_format_patch_options,
1264                              builtin_format_patch_usage,
1265                              PARSE_OPT_KEEP_ARGV0 | PARSE_OPT_KEEP_UNKNOWN |
1266                              PARSE_OPT_KEEP_DASHDASH);
1267
1268         if (0 < reroll_count) {
1269                 struct strbuf sprefix = STRBUF_INIT;
1270                 strbuf_addf(&sprefix, "%s v%d",
1271                             rev.subject_prefix, reroll_count);
1272                 rev.reroll_count = reroll_count;
1273                 rev.subject_prefix = strbuf_detach(&sprefix, NULL);
1274         }
1275
1276         for (i = 0; i < extra_hdr.nr; i++) {
1277                 strbuf_addstr(&buf, extra_hdr.items[i].string);
1278                 strbuf_addch(&buf, '\n');
1279         }
1280
1281         if (extra_to.nr)
1282                 strbuf_addstr(&buf, "To: ");
1283         for (i = 0; i < extra_to.nr; i++) {
1284                 if (i)
1285                         strbuf_addstr(&buf, "    ");
1286                 strbuf_addstr(&buf, extra_to.items[i].string);
1287                 if (i + 1 < extra_to.nr)
1288                         strbuf_addch(&buf, ',');
1289                 strbuf_addch(&buf, '\n');
1290         }
1291
1292         if (extra_cc.nr)
1293                 strbuf_addstr(&buf, "Cc: ");
1294         for (i = 0; i < extra_cc.nr; i++) {
1295                 if (i)
1296                         strbuf_addstr(&buf, "    ");
1297                 strbuf_addstr(&buf, extra_cc.items[i].string);
1298                 if (i + 1 < extra_cc.nr)
1299                         strbuf_addch(&buf, ',');
1300                 strbuf_addch(&buf, '\n');
1301         }
1302
1303         rev.extra_headers = strbuf_detach(&buf, NULL);
1304
1305         if (from) {
1306                 if (split_ident_line(&rev.from_ident, from, strlen(from)))
1307                         die(_("invalid ident line: %s"), from);
1308         }
1309
1310         if (start_number < 0)
1311                 start_number = 1;
1312
1313         /*
1314          * If numbered is set solely due to format.numbered in config,
1315          * and it would conflict with --keep-subject (-k) from the
1316          * command line, reset "numbered".
1317          */
1318         if (numbered && keep_subject && !numbered_cmdline_opt)
1319                 numbered = 0;
1320
1321         if (numbered && keep_subject)
1322                 die (_("-n and -k are mutually exclusive."));
1323         if (keep_subject && subject_prefix)
1324                 die (_("--subject-prefix and -k are mutually exclusive."));
1325         rev.preserve_subject = keep_subject;
1326
1327         argc = setup_revisions(argc, argv, &rev, &s_r_opt);
1328         if (argc > 1)
1329                 die (_("unrecognized argument: %s"), argv[1]);
1330
1331         if (rev.diffopt.output_format & DIFF_FORMAT_NAME)
1332                 die(_("--name-only does not make sense"));
1333         if (rev.diffopt.output_format & DIFF_FORMAT_NAME_STATUS)
1334                 die(_("--name-status does not make sense"));
1335         if (rev.diffopt.output_format & DIFF_FORMAT_CHECKDIFF)
1336                 die(_("--check does not make sense"));
1337
1338         if (!use_patch_format &&
1339                 (!rev.diffopt.output_format ||
1340                  rev.diffopt.output_format == DIFF_FORMAT_PATCH))
1341                 rev.diffopt.output_format = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_SUMMARY;
1342
1343         /* Always generate a patch */
1344         rev.diffopt.output_format |= DIFF_FORMAT_PATCH;
1345
1346         if (!DIFF_OPT_TST(&rev.diffopt, TEXT) && !no_binary_diff)
1347                 DIFF_OPT_SET(&rev.diffopt, BINARY);
1348
1349         if (rev.show_notes)
1350                 init_display_notes(&rev.notes_opt);
1351
1352         if (!use_stdout)
1353                 output_directory = set_outdir(prefix, output_directory);
1354         else
1355                 setup_pager();
1356
1357         if (output_directory) {
1358                 if (use_stdout)
1359                         die(_("standard output, or directory, which one?"));
1360                 if (mkdir(output_directory, 0777) < 0 && errno != EEXIST)
1361                         die_errno(_("Could not create directory '%s'"),
1362                                   output_directory);
1363         }
1364
1365         if (rev.pending.nr == 1) {
1366                 int check_head = 0;
1367
1368                 if (rev.max_count < 0 && !rev.show_root_diff) {
1369                         /*
1370                          * This is traditional behaviour of "git format-patch
1371                          * origin" that prepares what the origin side still
1372                          * does not have.
1373                          */
1374                         rev.pending.objects[0].item->flags |= UNINTERESTING;
1375                         add_head_to_pending(&rev);
1376                         check_head = 1;
1377                 }
1378                 /*
1379                  * Otherwise, it is "format-patch -22 HEAD", and/or
1380                  * "format-patch --root HEAD".  The user wants
1381                  * get_revision() to do the usual traversal.
1382                  */
1383
1384                 if (!strcmp(rev.pending.objects[0].name, "HEAD"))
1385                         check_head = 1;
1386
1387                 if (check_head) {
1388                         unsigned char sha1[20];
1389                         const char *ref;
1390                         ref = resolve_ref_unsafe("HEAD", sha1, 1, NULL);
1391                         if (ref && !prefixcmp(ref, "refs/heads/"))
1392                                 branch_name = xstrdup(ref + strlen("refs/heads/"));
1393                         else
1394                                 branch_name = xstrdup(""); /* no branch */
1395                 }
1396         }
1397
1398         /*
1399          * We cannot move this anywhere earlier because we do want to
1400          * know if --root was given explicitly from the command line.
1401          */
1402         rev.show_root_diff = 1;
1403
1404         if (ignore_if_in_upstream) {
1405                 /* Don't say anything if head and upstream are the same. */
1406                 if (rev.pending.nr == 2) {
1407                         struct object_array_entry *o = rev.pending.objects;
1408                         if (hashcmp(o[0].item->sha1, o[1].item->sha1) == 0)
1409                                 return 0;
1410                 }
1411                 get_patch_ids(&rev, &ids);
1412         }
1413
1414         if (!use_stdout)
1415                 realstdout = xfdopen(xdup(1), "w");
1416
1417         if (prepare_revision_walk(&rev))
1418                 die(_("revision walk setup failed"));
1419         rev.boundary = 1;
1420         while ((commit = get_revision(&rev)) != NULL) {
1421                 if (commit->object.flags & BOUNDARY) {
1422                         boundary_count++;
1423                         origin = (boundary_count == 1) ? commit : NULL;
1424                         continue;
1425                 }
1426
1427                 if (ignore_if_in_upstream &&
1428                                 has_commit_patch_id(commit, &ids))
1429                         continue;
1430
1431                 nr++;
1432                 list = xrealloc(list, nr * sizeof(list[0]));
1433                 list[nr - 1] = commit;
1434         }
1435         if (nr == 0)
1436                 /* nothing to do */
1437                 return 0;
1438         total = nr;
1439         if (!keep_subject && auto_number && total > 1)
1440                 numbered = 1;
1441         if (numbered)
1442                 rev.total = total + start_number - 1;
1443         if (cover_letter == -1) {
1444                 if (config_cover_letter == COVER_AUTO)
1445                         cover_letter = (total > 1);
1446                 else
1447                         cover_letter = (config_cover_letter == COVER_ON);
1448         }
1449
1450         if (in_reply_to || thread || cover_letter)
1451                 rev.ref_message_ids = xcalloc(1, sizeof(struct string_list));
1452         if (in_reply_to) {
1453                 const char *msgid = clean_message_id(in_reply_to);
1454                 string_list_append(rev.ref_message_ids, msgid);
1455         }
1456         rev.numbered_files = just_numbers;
1457         rev.patch_suffix = fmt_patch_suffix;
1458         if (cover_letter) {
1459                 if (thread)
1460                         gen_message_id(&rev, "cover");
1461                 make_cover_letter(&rev, use_stdout,
1462                                   origin, nr, list, branch_name, quiet);
1463                 total++;
1464                 start_number--;
1465         }
1466         rev.add_signoff = do_signoff;
1467         while (0 <= --nr) {
1468                 int shown;
1469                 commit = list[nr];
1470                 rev.nr = total - nr + (start_number - 1);
1471                 /* Make the second and subsequent mails replies to the first */
1472                 if (thread) {
1473                         /* Have we already had a message ID? */
1474                         if (rev.message_id) {
1475                                 /*
1476                                  * For deep threading: make every mail
1477                                  * a reply to the previous one, no
1478                                  * matter what other options are set.
1479                                  *
1480                                  * For shallow threading:
1481                                  *
1482                                  * Without --cover-letter and
1483                                  * --in-reply-to, make every mail a
1484                                  * reply to the one before.
1485                                  *
1486                                  * With --in-reply-to but no
1487                                  * --cover-letter, make every mail a
1488                                  * reply to the <reply-to>.
1489                                  *
1490                                  * With --cover-letter, make every
1491                                  * mail but the cover letter a reply
1492                                  * to the cover letter.  The cover
1493                                  * letter is a reply to the
1494                                  * --in-reply-to, if specified.
1495                                  */
1496                                 if (thread == THREAD_SHALLOW
1497                                     && rev.ref_message_ids->nr > 0
1498                                     && (!cover_letter || rev.nr > 1))
1499                                         free(rev.message_id);
1500                                 else
1501                                         string_list_append(rev.ref_message_ids,
1502                                                            rev.message_id);
1503                         }
1504                         gen_message_id(&rev, sha1_to_hex(commit->object.sha1));
1505                 }
1506
1507                 if (!use_stdout &&
1508                     reopen_stdout(rev.numbered_files ? NULL : commit, NULL, &rev, quiet))
1509                         die(_("Failed to create output files"));
1510                 shown = log_tree_commit(&rev, commit);
1511                 free(commit->buffer);
1512                 commit->buffer = NULL;
1513
1514                 /* We put one extra blank line between formatted
1515                  * patches and this flag is used by log-tree code
1516                  * to see if it needs to emit a LF before showing
1517                  * the log; when using one file per patch, we do
1518                  * not want the extra blank line.
1519                  */
1520                 if (!use_stdout)
1521                         rev.shown_one = 0;
1522                 if (shown) {
1523                         if (rev.mime_boundary)
1524                                 printf("\n--%s%s--\n\n\n",
1525                                        mime_boundary_leader,
1526                                        rev.mime_boundary);
1527                         else
1528                                 print_signature();
1529                 }
1530                 if (!use_stdout)
1531                         fclose(stdout);
1532         }
1533         free(list);
1534         free(branch_name);
1535         string_list_clear(&extra_to, 0);
1536         string_list_clear(&extra_cc, 0);
1537         string_list_clear(&extra_hdr, 0);
1538         if (ignore_if_in_upstream)
1539                 free_patch_ids(&ids);
1540         return 0;
1541 }
1542
1543 static int add_pending_commit(const char *arg, struct rev_info *revs, int flags)
1544 {
1545         unsigned char sha1[20];
1546         if (get_sha1(arg, sha1) == 0) {
1547                 struct commit *commit = lookup_commit_reference(sha1);
1548                 if (commit) {
1549                         commit->object.flags |= flags;
1550                         add_pending_object(revs, &commit->object, arg);
1551                         return 0;
1552                 }
1553         }
1554         return -1;
1555 }
1556
1557 static const char * const cherry_usage[] = {
1558         N_("git cherry [-v] [<upstream> [<head> [<limit>]]]"),
1559         NULL
1560 };
1561
1562 static void print_commit(char sign, struct commit *commit, int verbose,
1563                          int abbrev)
1564 {
1565         if (!verbose) {
1566                 printf("%c %s\n", sign,
1567                        find_unique_abbrev(commit->object.sha1, abbrev));
1568         } else {
1569                 struct strbuf buf = STRBUF_INIT;
1570                 pp_commit_easy(CMIT_FMT_ONELINE, commit, &buf);
1571                 printf("%c %s %s\n", sign,
1572                        find_unique_abbrev(commit->object.sha1, abbrev),
1573                        buf.buf);
1574                 strbuf_release(&buf);
1575         }
1576 }
1577
1578 int cmd_cherry(int argc, const char **argv, const char *prefix)
1579 {
1580         struct rev_info revs;
1581         struct patch_ids ids;
1582         struct commit *commit;
1583         struct commit_list *list = NULL;
1584         struct branch *current_branch;
1585         const char *upstream;
1586         const char *head = "HEAD";
1587         const char *limit = NULL;
1588         int verbose = 0, abbrev = 0;
1589
1590         struct option options[] = {
1591                 OPT__ABBREV(&abbrev),
1592                 OPT__VERBOSE(&verbose, N_("be verbose")),
1593                 OPT_END()
1594         };
1595
1596         argc = parse_options(argc, argv, prefix, options, cherry_usage, 0);
1597
1598         switch (argc) {
1599         case 3:
1600                 limit = argv[2];
1601                 /* FALLTHROUGH */
1602         case 2:
1603                 head = argv[1];
1604                 /* FALLTHROUGH */
1605         case 1:
1606                 upstream = argv[0];
1607                 break;
1608         default:
1609                 current_branch = branch_get(NULL);
1610                 if (!current_branch || !current_branch->merge
1611                                         || !current_branch->merge[0]
1612                                         || !current_branch->merge[0]->dst) {
1613                         fprintf(stderr, _("Could not find a tracked"
1614                                         " remote branch, please"
1615                                         " specify <upstream> manually.\n"));
1616                         usage_with_options(cherry_usage, options);
1617                 }
1618
1619                 upstream = current_branch->merge[0]->dst;
1620         }
1621
1622         init_revisions(&revs, prefix);
1623         revs.max_parents = 1;
1624
1625         if (add_pending_commit(head, &revs, 0))
1626                 die(_("Unknown commit %s"), head);
1627         if (add_pending_commit(upstream, &revs, UNINTERESTING))
1628                 die(_("Unknown commit %s"), upstream);
1629
1630         /* Don't say anything if head and upstream are the same. */
1631         if (revs.pending.nr == 2) {
1632                 struct object_array_entry *o = revs.pending.objects;
1633                 if (hashcmp(o[0].item->sha1, o[1].item->sha1) == 0)
1634                         return 0;
1635         }
1636
1637         get_patch_ids(&revs, &ids);
1638
1639         if (limit && add_pending_commit(limit, &revs, UNINTERESTING))
1640                 die(_("Unknown commit %s"), limit);
1641
1642         /* reverse the list of commits */
1643         if (prepare_revision_walk(&revs))
1644                 die(_("revision walk setup failed"));
1645         while ((commit = get_revision(&revs)) != NULL) {
1646                 commit_list_insert(commit, &list);
1647         }
1648
1649         while (list) {
1650                 char sign = '+';
1651
1652                 commit = list->item;
1653                 if (has_commit_patch_id(commit, &ids))
1654                         sign = '-';
1655                 print_commit(sign, commit, verbose, abbrev);
1656                 list = list->next;
1657         }
1658
1659         free_patch_ids(&ids);
1660         return 0;
1661 }