git.oblomov.eu Git - git/blob - builtin/log.c

   1 /*
   2  * Builtin "git log" and related commands (show, whatchanged)
   3  *
   4  * (C) Copyright 2006 Linus Torvalds
   5  *               2006 Junio Hamano
   6  */
   7 #include "cache.h"
   8 #include "color.h"
   9 #include "commit.h"
  10 #include "diff.h"
  11 #include "revision.h"
  12 #include "log-tree.h"
  13 #include "builtin.h"
  14 #include "tag.h"
  15 #include "reflog-walk.h"
  16 #include "patch-ids.h"
  17 #include "run-command.h"
  18 #include "shortlog.h"
  19 #include "remote.h"
  20 #include "string-list.h"
  21 #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 (starts_with(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 (starts_with(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", or "--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 const char *signature_file;
 677 static int config_cover_letter;
 678
 679 enum {
 680         COVER_UNSET,
 681         COVER_OFF,
 682         COVER_ON,
 683         COVER_AUTO
 684 };
 685
 686 static int git_format_config(const char *var, const char *value, void *cb)
 687 {
 688         if (!strcmp(var, "format.headers")) {
 689                 if (!value)
 690                         die(_("format.headers without value"));
 691                 add_header(value);
 692                 return 0;
 693         }
 694         if (!strcmp(var, "format.suffix"))
 695                 return git_config_string(&fmt_patch_suffix, var, value);
 696         if (!strcmp(var, "format.to")) {
 697                 if (!value)
 698                         return config_error_nonbool(var);
 699                 string_list_append(&extra_to, value);
 700                 return 0;
 701         }
 702         if (!strcmp(var, "format.cc")) {
 703                 if (!value)
 704                         return config_error_nonbool(var);
 705                 string_list_append(&extra_cc, value);
 706                 return 0;
 707         }
 708         if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff") ||
 709             !strcmp(var, "color.ui")) {
 710                 return 0;
 711         }
 712         if (!strcmp(var, "format.numbered")) {
 713                 if (value && !strcasecmp(value, "auto")) {
 714                         auto_number = 1;
 715                         return 0;
 716                 }
 717                 numbered = git_config_bool(var, value);
 718                 auto_number = auto_number && numbered;
 719                 return 0;
 720         }
 721         if (!strcmp(var, "format.attach")) {
 722                 if (value && *value)
 723                         default_attach = xstrdup(value);
 724                 else
 725                         default_attach = xstrdup(git_version_string);
 726                 return 0;
 727         }
 728         if (!strcmp(var, "format.thread")) {
 729                 if (value && !strcasecmp(value, "deep")) {
 730                         thread = THREAD_DEEP;
 731                         return 0;
 732                 }
 733                 if (value && !strcasecmp(value, "shallow")) {
 734                         thread = THREAD_SHALLOW;
 735                         return 0;
 736                 }
 737                 thread = git_config_bool(var, value) && THREAD_SHALLOW;
 738                 return 0;
 739         }
 740         if (!strcmp(var, "format.signoff")) {
 741                 do_signoff = git_config_bool(var, value);
 742                 return 0;
 743         }
 744         if (!strcmp(var, "format.signature"))
 745                 return git_config_string(&signature, var, value);
 746         if (!strcmp(var, "format.signaturefile"))
 747                 return git_config_pathname(&signature_file, var, value);
 748         if (!strcmp(var, "format.coverletter")) {
 749                 if (value && !strcasecmp(value, "auto")) {
 750                         config_cover_letter = COVER_AUTO;
 751                         return 0;
 752                 }
 753                 config_cover_letter = git_config_bool(var, value) ? COVER_ON : COVER_OFF;
 754                 return 0;
 755         }
 756
 757         return git_log_config(var, value, cb);
 758 }
 759
 760 static FILE *realstdout = NULL;
 761 static const char *output_directory = NULL;
 762 static int outdir_offset;
 763
 764 static int reopen_stdout(struct commit *commit, const char *subject,
 765                          struct rev_info *rev, int quiet)
 766 {
 767         struct strbuf filename = STRBUF_INIT;
 768         int suffix_len = strlen(rev->patch_suffix) + 1;
 769
 770         if (output_directory) {
 771                 strbuf_addstr(&filename, output_directory);
 772                 if (filename.len >=
 773                     PATH_MAX - FORMAT_PATCH_NAME_MAX - suffix_len)
 774                         return error(_("name of output directory is too long"));
 775                 if (filename.buf[filename.len - 1] != '/')
 776                         strbuf_addch(&filename, '/');
 777         }
 778
 779         if (rev->numbered_files)
 780                 strbuf_addf(&filename, "%d", rev->nr);
 781         else if (commit)
 782                 fmt_output_commit(&filename, commit, rev);
 783         else
 784                 fmt_output_subject(&filename, subject, rev);
 785
 786         if (!quiet)
 787                 fprintf(realstdout, "%s\n", filename.buf + outdir_offset);
 788
 789         if (freopen(filename.buf, "w", stdout) == NULL)
 790                 return error(_("Cannot open patch file %s"), filename.buf);
 791
 792         strbuf_release(&filename);
 793         return 0;
 794 }
 795
 796 static void get_patch_ids(struct rev_info *rev, struct patch_ids *ids)
 797 {
 798         struct rev_info check_rev;
 799         struct commit *commit;
 800         struct object *o1, *o2;
 801         unsigned flags1, flags2;
 802
 803         if (rev->pending.nr != 2)
 804                 die(_("Need exactly one range."));
 805
 806         o1 = rev->pending.objects[0].item;
 807         flags1 = o1->flags;
 808         o2 = rev->pending.objects[1].item;
 809         flags2 = o2->flags;
 810
 811         if ((flags1 & UNINTERESTING) == (flags2 & UNINTERESTING))
 812                 die(_("Not a range."));
 813
 814         init_patch_ids(ids);
 815
 816         /* given a range a..b get all patch ids for b..a */
 817         init_revisions(&check_rev, rev->prefix);
 818         check_rev.max_parents = 1;
 819         o1->flags ^= UNINTERESTING;
 820         o2->flags ^= UNINTERESTING;
 821         add_pending_object(&check_rev, o1, "o1");
 822         add_pending_object(&check_rev, o2, "o2");
 823         if (prepare_revision_walk(&check_rev))
 824                 die(_("revision walk setup failed"));
 825
 826         while ((commit = get_revision(&check_rev)) != NULL) {
 827                 add_commit_patch_id(commit, ids);
 828         }
 829
 830         /* reset for next revision walk */
 831         clear_commit_marks((struct commit *)o1,
 832                         SEEN | UNINTERESTING | SHOWN | ADDED);
 833         clear_commit_marks((struct commit *)o2,
 834                         SEEN | UNINTERESTING | SHOWN | ADDED);
 835         o1->flags = flags1;
 836         o2->flags = flags2;
 837 }
 838
 839 static void gen_message_id(struct rev_info *info, char *base)
 840 {
 841         struct strbuf buf = STRBUF_INIT;
 842         strbuf_addf(&buf, "%s.%lu.git.%s", base,
 843                     (unsigned long) time(NULL),
 844                     git_committer_info(IDENT_NO_NAME|IDENT_NO_DATE|IDENT_STRICT));
 845         info->message_id = strbuf_detach(&buf, NULL);
 846 }
 847
 848 static void print_signature(void)
 849 {
 850         if (!signature || !*signature)
 851                 return;
 852
 853         printf("-- \n%s", signature);
 854         if (signature[strlen(signature)-1] != '\n')
 855                 putchar('\n');
 856         putchar('\n');
 857 }
 858
 859 static void add_branch_description(struct strbuf *buf, const char *branch_name)
 860 {
 861         struct strbuf desc = STRBUF_INIT;
 862         if (!branch_name || !*branch_name)
 863                 return;
 864         read_branch_desc(&desc, branch_name);
 865         if (desc.len) {
 866                 strbuf_addch(buf, '\n');
 867                 strbuf_add(buf, desc.buf, desc.len);
 868                 strbuf_addch(buf, '\n');
 869         }
 870 }
 871
 872 static char *find_branch_name(struct rev_info *rev)
 873 {
 874         int i, positive = -1;
 875         unsigned char branch_sha1[20];
 876         const unsigned char *tip_sha1;
 877         const char *ref;
 878         char *full_ref, *branch = NULL;
 879
 880         for (i = 0; i < rev->cmdline.nr; i++) {
 881                 if (rev->cmdline.rev[i].flags & UNINTERESTING)
 882                         continue;
 883                 if (positive < 0)
 884                         positive = i;
 885                 else
 886                         return NULL;
 887         }
 888         if (positive < 0)
 889                 return NULL;
 890         ref = rev->cmdline.rev[positive].name;
 891         tip_sha1 = rev->cmdline.rev[positive].item->sha1;
 892         if (dwim_ref(ref, strlen(ref), branch_sha1, &full_ref) &&
 893             starts_with(full_ref, "refs/heads/") &&
 894             !hashcmp(tip_sha1, branch_sha1))
 895                 branch = xstrdup(full_ref + strlen("refs/heads/"));
 896         free(full_ref);
 897         return branch;
 898 }
 899
 900 static void make_cover_letter(struct rev_info *rev, int use_stdout,
 901                               struct commit *origin,
 902                               int nr, struct commit **list,
 903                               const char *branch_name,
 904                               int quiet)
 905 {
 906         const char *committer;
 907         const char *body = "*** SUBJECT HERE ***\n\n*** BLURB HERE ***\n";
 908         const char *msg;
 909         struct shortlog log;
 910         struct strbuf sb = STRBUF_INIT;
 911         int i;
 912         const char *encoding = "UTF-8";
 913         struct diff_options opts;
 914         int need_8bit_cte = 0;
 915         struct pretty_print_context pp = {0};
 916         struct commit *head = list[0];
 917
 918         if (rev->commit_format != CMIT_FMT_EMAIL)
 919                 die(_("Cover letter needs email format"));
 920
 921         committer = git_committer_info(0);
 922
 923         if (!use_stdout &&
 924             reopen_stdout(NULL, rev->numbered_files ? NULL : "cover-letter", rev, quiet))
 925                 return;
 926
 927         log_write_email_headers(rev, head, &pp.subject, &pp.after_subject,
 928                                 &need_8bit_cte);
 929
 930         for (i = 0; !need_8bit_cte && i < nr; i++)
 931                 if (has_non_ascii(list[i]->buffer))
 932                         need_8bit_cte = 1;
 933
 934         if (!branch_name)
 935                 branch_name = find_branch_name(rev);
 936
 937         msg = body;
 938         pp.fmt = CMIT_FMT_EMAIL;
 939         pp.date_mode = DATE_RFC2822;
 940         pp_user_info(&pp, NULL, &sb, committer, encoding);
 941         pp_title_line(&pp, &msg, &sb, encoding, need_8bit_cte);
 942         pp_remainder(&pp, &msg, &sb, 0);
 943         add_branch_description(&sb, branch_name);
 944         printf("%s\n", sb.buf);
 945
 946         strbuf_release(&sb);
 947
 948         shortlog_init(&log);
 949         log.wrap_lines = 1;
 950         log.wrap = 72;
 951         log.in1 = 2;
 952         log.in2 = 4;
 953         for (i = 0; i < nr; i++)
 954                 shortlog_add_commit(&log, list[i]);
 955
 956         shortlog_output(&log);
 957
 958         /*
 959          * We can only do diffstat with a unique reference point
 960          */
 961         if (!origin)
 962                 return;
 963
 964         memcpy(&opts, &rev->diffopt, sizeof(opts));
 965         opts.output_format = DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT;
 966
 967         diff_setup_done(&opts);
 968
 969         diff_tree_sha1(origin->tree->object.sha1,
 970                        head->tree->object.sha1,
 971                        "", &opts);
 972         diffcore_std(&opts);
 973         diff_flush(&opts);
 974
 975         printf("\n");
 976         print_signature();
 977 }
 978
 979 static const char *clean_message_id(const char *msg_id)
 980 {
 981         char ch;
 982         const char *a, *z, *m;
 983
 984         m = msg_id;
 985         while ((ch = *m) && (isspace(ch) || (ch == '<')))
 986                 m++;
 987         a = m;
 988         z = NULL;
 989         while ((ch = *m)) {
 990                 if (!isspace(ch) && (ch != '>'))
 991                         z = m;
 992                 m++;
 993         }
 994         if (!z)
 995                 die(_("insane in-reply-to: %s"), msg_id);
 996         if (++z == m)
 997                 return a;
 998         return xmemdupz(a, z - a);
 999 }
1000
1001 static const char *set_outdir(const char *prefix, const char *output_directory)
1002 {
1003         if (output_directory && is_absolute_path(output_directory))
1004                 return output_directory;
1005
1006         if (!prefix || !*prefix) {
1007                 if (output_directory)
1008                         return output_directory;
1009                 /* The user did not explicitly ask for "./" */
1010                 outdir_offset = 2;
1011                 return "./";
1012         }
1013
1014         outdir_offset = strlen(prefix);
1015         if (!output_directory)
1016                 return prefix;
1017
1018         return xstrdup(prefix_filename(prefix, outdir_offset,
1019                                        output_directory));
1020 }
1021
1022 static const char * const builtin_format_patch_usage[] = {
1023         N_("git format-patch [options] [<since> | <revision range>]"),
1024         NULL
1025 };
1026
1027 static int keep_subject = 0;
1028
1029 static int keep_callback(const struct option *opt, const char *arg, int unset)
1030 {
1031         ((struct rev_info *)opt->value)->total = -1;
1032         keep_subject = 1;
1033         return 0;
1034 }
1035
1036 static int subject_prefix = 0;
1037
1038 static int subject_prefix_callback(const struct option *opt, const char *arg,
1039                             int unset)
1040 {
1041         subject_prefix = 1;
1042         ((struct rev_info *)opt->value)->subject_prefix = arg;
1043         return 0;
1044 }
1045
1046 static int numbered_cmdline_opt = 0;
1047
1048 static int numbered_callback(const struct option *opt, const char *arg,
1049                              int unset)
1050 {
1051         *(int *)opt->value = numbered_cmdline_opt = unset ? 0 : 1;
1052         if (unset)
1053                 auto_number =  0;
1054         return 0;
1055 }
1056
1057 static int no_numbered_callback(const struct option *opt, const char *arg,
1058                                 int unset)
1059 {
1060         return numbered_callback(opt, arg, 1);
1061 }
1062
1063 static int output_directory_callback(const struct option *opt, const char *arg,
1064                               int unset)
1065 {
1066         const char **dir = (const char **)opt->value;
1067         if (*dir)
1068                 die(_("Two output directories?"));
1069         *dir = arg;
1070         return 0;
1071 }
1072
1073 static int thread_callback(const struct option *opt, const char *arg, int unset)
1074 {
1075         int *thread = (int *)opt->value;
1076         if (unset)
1077                 *thread = 0;
1078         else if (!arg || !strcmp(arg, "shallow"))
1079                 *thread = THREAD_SHALLOW;
1080         else if (!strcmp(arg, "deep"))
1081                 *thread = THREAD_DEEP;
1082         else
1083                 return 1;
1084         return 0;
1085 }
1086
1087 static int attach_callback(const struct option *opt, const char *arg, int unset)
1088 {
1089         struct rev_info *rev = (struct rev_info *)opt->value;
1090         if (unset)
1091                 rev->mime_boundary = NULL;
1092         else if (arg)
1093                 rev->mime_boundary = arg;
1094         else
1095                 rev->mime_boundary = git_version_string;
1096         rev->no_inline = unset ? 0 : 1;
1097         return 0;
1098 }
1099
1100 static int inline_callback(const struct option *opt, const char *arg, int unset)
1101 {
1102         struct rev_info *rev = (struct rev_info *)opt->value;
1103         if (unset)
1104                 rev->mime_boundary = NULL;
1105         else if (arg)
1106                 rev->mime_boundary = arg;
1107         else
1108                 rev->mime_boundary = git_version_string;
1109         rev->no_inline = 0;
1110         return 0;
1111 }
1112
1113 static int header_callback(const struct option *opt, const char *arg, int unset)
1114 {
1115         if (unset) {
1116                 string_list_clear(&extra_hdr, 0);
1117                 string_list_clear(&extra_to, 0);
1118                 string_list_clear(&extra_cc, 0);
1119         } else {
1120             add_header(arg);
1121         }
1122         return 0;
1123 }
1124
1125 static int to_callback(const struct option *opt, const char *arg, int unset)
1126 {
1127         if (unset)
1128                 string_list_clear(&extra_to, 0);
1129         else
1130                 string_list_append(&extra_to, arg);
1131         return 0;
1132 }
1133
1134 static int cc_callback(const struct option *opt, const char *arg, int unset)
1135 {
1136         if (unset)
1137                 string_list_clear(&extra_cc, 0);
1138         else
1139                 string_list_append(&extra_cc, arg);
1140         return 0;
1141 }
1142
1143 static int from_callback(const struct option *opt, const char *arg, int unset)
1144 {
1145         char **from = opt->value;
1146
1147         free(*from);
1148
1149         if (unset)
1150                 *from = NULL;
1151         else if (arg)
1152                 *from = xstrdup(arg);
1153         else
1154                 *from = xstrdup(git_committer_info(IDENT_NO_DATE));
1155         return 0;
1156 }
1157
1158 int cmd_format_patch(int argc, const char **argv, const char *prefix)
1159 {
1160         struct commit *commit;
1161         struct commit **list = NULL;
1162         struct rev_info rev;
1163         struct setup_revision_opt s_r_opt;
1164         int nr = 0, total, i;
1165         int use_stdout = 0;
1166         int start_number = -1;
1167         int just_numbers = 0;
1168         int ignore_if_in_upstream = 0;
1169         int cover_letter = -1;
1170         int boundary_count = 0;
1171         int no_binary_diff = 0;
1172         struct commit *origin = NULL;
1173         const char *in_reply_to = NULL;
1174         struct patch_ids ids;
1175         struct strbuf buf = STRBUF_INIT;
1176         int use_patch_format = 0;
1177         int quiet = 0;
1178         int reroll_count = -1;
1179         char *branch_name = NULL;
1180         char *from = NULL;
1181         const struct option builtin_format_patch_options[] = {
1182                 { OPTION_CALLBACK, 'n', "numbered", &numbered, NULL,
1183                             N_("use [PATCH n/m] even with a single patch"),
1184                             PARSE_OPT_NOARG, numbered_callback },
1185                 { OPTION_CALLBACK, 'N', "no-numbered", &numbered, NULL,
1186                             N_("use [PATCH] even with multiple patches"),
1187                             PARSE_OPT_NOARG, no_numbered_callback },
1188                 OPT_BOOL('s', "signoff", &do_signoff, N_("add Signed-off-by:")),
1189                 OPT_BOOL(0, "stdout", &use_stdout,
1190                             N_("print patches to standard out")),
1191                 OPT_BOOL(0, "cover-letter", &cover_letter,
1192                             N_("generate a cover letter")),
1193                 OPT_BOOL(0, "numbered-files", &just_numbers,
1194                             N_("use simple number sequence for output file names")),
1195                 OPT_STRING(0, "suffix", &fmt_patch_suffix, N_("sfx"),
1196                             N_("use <sfx> instead of '.patch'")),
1197                 OPT_INTEGER(0, "start-number", &start_number,
1198                             N_("start numbering patches at <n> instead of 1")),
1199                 OPT_INTEGER('v', "reroll-count", &reroll_count,
1200                             N_("mark the series as Nth re-roll")),
1201                 { OPTION_CALLBACK, 0, "subject-prefix", &rev, N_("prefix"),
1202                             N_("Use [<prefix>] instead of [PATCH]"),
1203                             PARSE_OPT_NONEG, subject_prefix_callback },
1204                 { OPTION_CALLBACK, 'o', "output-directory", &output_directory,
1205                             N_("dir"), N_("store resulting files in <dir>"),
1206                             PARSE_OPT_NONEG, output_directory_callback },
1207                 { OPTION_CALLBACK, 'k', "keep-subject", &rev, NULL,
1208                             N_("don't strip/add [PATCH]"),
1209                             PARSE_OPT_NOARG | PARSE_OPT_NONEG, keep_callback },
1210                 OPT_BOOL(0, "no-binary", &no_binary_diff,
1211                          N_("don't output binary diffs")),
1212                 OPT_BOOL(0, "ignore-if-in-upstream", &ignore_if_in_upstream,
1213                          N_("don't include a patch matching a commit upstream")),
1214                 { OPTION_SET_INT, 'p', "no-stat", &use_patch_format, NULL,
1215                   N_("show patch format instead of default (patch + stat)"),
1216                   PARSE_OPT_NONEG | PARSE_OPT_NOARG, NULL, 1},
1217                 OPT_GROUP(N_("Messaging")),
1218                 { OPTION_CALLBACK, 0, "add-header", NULL, N_("header"),
1219                             N_("add email header"), 0, header_callback },
1220                 { OPTION_CALLBACK, 0, "to", NULL, N_("email"), N_("add To: header"),
1221                             0, to_callback },
1222                 { OPTION_CALLBACK, 0, "cc", NULL, N_("email"), N_("add Cc: header"),
1223                             0, cc_callback },
1224                 { OPTION_CALLBACK, 0, "from", &from, N_("ident"),
1225                             N_("set From address to <ident> (or committer ident if absent)"),
1226                             PARSE_OPT_OPTARG, from_callback },
1227                 OPT_STRING(0, "in-reply-to", &in_reply_to, N_("message-id"),
1228                             N_("make first mail a reply to <message-id>")),
1229                 { OPTION_CALLBACK, 0, "attach", &rev, N_("boundary"),
1230                             N_("attach the patch"), PARSE_OPT_OPTARG,
1231                             attach_callback },
1232                 { OPTION_CALLBACK, 0, "inline", &rev, N_("boundary"),
1233                             N_("inline the patch"),
1234                             PARSE_OPT_OPTARG | PARSE_OPT_NONEG,
1235                             inline_callback },
1236                 { OPTION_CALLBACK, 0, "thread", &thread, N_("style"),
1237                             N_("enable message threading, styles: shallow, deep"),
1238                             PARSE_OPT_OPTARG, thread_callback },
1239                 OPT_STRING(0, "signature", &signature, N_("signature"),
1240                             N_("add a signature")),
1241                 OPT_FILENAME(0, "signature-file", &signature_file,
1242                                 N_("add a signature from a file")),
1243                 OPT__QUIET(&quiet, N_("don't print the patch filenames")),
1244                 OPT_END()
1245         };
1246
1247         extra_hdr.strdup_strings = 1;
1248         extra_to.strdup_strings = 1;
1249         extra_cc.strdup_strings = 1;
1250         init_grep_defaults();
1251         git_config(git_format_config, NULL);
1252         init_revisions(&rev, prefix);
1253         rev.commit_format = CMIT_FMT_EMAIL;
1254         rev.verbose_header = 1;
1255         rev.diff = 1;
1256         rev.max_parents = 1;
1257         DIFF_OPT_SET(&rev.diffopt, RECURSIVE);
1258         rev.subject_prefix = fmt_patch_subject_prefix;
1259         memset(&s_r_opt, 0, sizeof(s_r_opt));
1260         s_r_opt.def = "HEAD";
1261         s_r_opt.revarg_opt = REVARG_COMMITTISH;
1262
1263         if (default_attach) {
1264                 rev.mime_boundary = default_attach;
1265                 rev.no_inline = 1;
1266         }
1267
1268         /*
1269          * Parse the arguments before setup_revisions(), or something
1270          * like "git format-patch -o a123 HEAD^.." may fail; a123 is
1271          * possibly a valid SHA1.
1272          */
1273         argc = parse_options(argc, argv, prefix, builtin_format_patch_options,
1274                              builtin_format_patch_usage,
1275                              PARSE_OPT_KEEP_ARGV0 | PARSE_OPT_KEEP_UNKNOWN |
1276                              PARSE_OPT_KEEP_DASHDASH);
1277
1278         if (0 < reroll_count) {
1279                 struct strbuf sprefix = STRBUF_INIT;
1280                 strbuf_addf(&sprefix, "%s v%d",
1281                             rev.subject_prefix, reroll_count);
1282                 rev.reroll_count = reroll_count;
1283                 rev.subject_prefix = strbuf_detach(&sprefix, NULL);
1284         }
1285
1286         for (i = 0; i < extra_hdr.nr; i++) {
1287                 strbuf_addstr(&buf, extra_hdr.items[i].string);
1288                 strbuf_addch(&buf, '\n');
1289         }
1290
1291         if (extra_to.nr)
1292                 strbuf_addstr(&buf, "To: ");
1293         for (i = 0; i < extra_to.nr; i++) {
1294                 if (i)
1295                         strbuf_addstr(&buf, "    ");
1296                 strbuf_addstr(&buf, extra_to.items[i].string);
1297                 if (i + 1 < extra_to.nr)
1298                         strbuf_addch(&buf, ',');
1299                 strbuf_addch(&buf, '\n');
1300         }
1301
1302         if (extra_cc.nr)
1303                 strbuf_addstr(&buf, "Cc: ");
1304         for (i = 0; i < extra_cc.nr; i++) {
1305                 if (i)
1306                         strbuf_addstr(&buf, "    ");
1307                 strbuf_addstr(&buf, extra_cc.items[i].string);
1308                 if (i + 1 < extra_cc.nr)
1309                         strbuf_addch(&buf, ',');
1310                 strbuf_addch(&buf, '\n');
1311         }
1312
1313         rev.extra_headers = strbuf_detach(&buf, NULL);
1314
1315         if (from) {
1316                 if (split_ident_line(&rev.from_ident, from, strlen(from)))
1317                         die(_("invalid ident line: %s"), from);
1318         }
1319
1320         if (start_number < 0)
1321                 start_number = 1;
1322
1323         /*
1324          * If numbered is set solely due to format.numbered in config,
1325          * and it would conflict with --keep-subject (-k) from the
1326          * command line, reset "numbered".
1327          */
1328         if (numbered && keep_subject && !numbered_cmdline_opt)
1329                 numbered = 0;
1330
1331         if (numbered && keep_subject)
1332                 die (_("-n and -k are mutually exclusive."));
1333         if (keep_subject && subject_prefix)
1334                 die (_("--subject-prefix and -k are mutually exclusive."));
1335         rev.preserve_subject = keep_subject;
1336
1337         argc = setup_revisions(argc, argv, &rev, &s_r_opt);
1338         if (argc > 1)
1339                 die (_("unrecognized argument: %s"), argv[1]);
1340
1341         if (rev.diffopt.output_format & DIFF_FORMAT_NAME)
1342                 die(_("--name-only does not make sense"));
1343         if (rev.diffopt.output_format & DIFF_FORMAT_NAME_STATUS)
1344                 die(_("--name-status does not make sense"));
1345         if (rev.diffopt.output_format & DIFF_FORMAT_CHECKDIFF)
1346                 die(_("--check does not make sense"));
1347
1348         if (!use_patch_format &&
1349                 (!rev.diffopt.output_format ||
1350                  rev.diffopt.output_format == DIFF_FORMAT_PATCH))
1351                 rev.diffopt.output_format = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_SUMMARY;
1352
1353         /* Always generate a patch */
1354         rev.diffopt.output_format |= DIFF_FORMAT_PATCH;
1355
1356         if (!DIFF_OPT_TST(&rev.diffopt, TEXT) && !no_binary_diff)
1357                 DIFF_OPT_SET(&rev.diffopt, BINARY);
1358
1359         if (rev.show_notes)
1360                 init_display_notes(&rev.notes_opt);
1361
1362         if (!use_stdout)
1363                 output_directory = set_outdir(prefix, output_directory);
1364         else
1365                 setup_pager();
1366
1367         if (output_directory) {
1368                 if (use_stdout)
1369                         die(_("standard output, or directory, which one?"));
1370                 if (mkdir(output_directory, 0777) < 0 && errno != EEXIST)
1371                         die_errno(_("Could not create directory '%s'"),
1372                                   output_directory);
1373         }
1374
1375         if (rev.pending.nr == 1) {
1376                 int check_head = 0;
1377
1378                 if (rev.max_count < 0 && !rev.show_root_diff) {
1379                         /*
1380                          * This is traditional behaviour of "git format-patch
1381                          * origin" that prepares what the origin side still
1382                          * does not have.
1383                          */
1384                         rev.pending.objects[0].item->flags |= UNINTERESTING;
1385                         add_head_to_pending(&rev);
1386                         check_head = 1;
1387                 }
1388                 /*
1389                  * Otherwise, it is "format-patch -22 HEAD", and/or
1390                  * "format-patch --root HEAD".  The user wants
1391                  * get_revision() to do the usual traversal.
1392                  */
1393
1394                 if (!strcmp(rev.pending.objects[0].name, "HEAD"))
1395                         check_head = 1;
1396
1397                 if (check_head) {
1398                         unsigned char sha1[20];
1399                         const char *ref;
1400                         ref = resolve_ref_unsafe("HEAD", sha1, 1, NULL);
1401                         if (ref && starts_with(ref, "refs/heads/"))
1402                                 branch_name = xstrdup(ref + strlen("refs/heads/"));
1403                         else
1404                                 branch_name = xstrdup(""); /* no branch */
1405                 }
1406         }
1407
1408         /*
1409          * We cannot move this anywhere earlier because we do want to
1410          * know if --root was given explicitly from the command line.
1411          */
1412         rev.show_root_diff = 1;
1413
1414         if (ignore_if_in_upstream) {
1415                 /* Don't say anything if head and upstream are the same. */
1416                 if (rev.pending.nr == 2) {
1417                         struct object_array_entry *o = rev.pending.objects;
1418                         if (hashcmp(o[0].item->sha1, o[1].item->sha1) == 0)
1419                                 return 0;
1420                 }
1421                 get_patch_ids(&rev, &ids);
1422         }
1423
1424         if (!use_stdout)
1425                 realstdout = xfdopen(xdup(1), "w");
1426
1427         if (prepare_revision_walk(&rev))
1428                 die(_("revision walk setup failed"));
1429         rev.boundary = 1;
1430         while ((commit = get_revision(&rev)) != NULL) {
1431                 if (commit->object.flags & BOUNDARY) {
1432                         boundary_count++;
1433                         origin = (boundary_count == 1) ? commit : NULL;
1434                         continue;
1435                 }
1436
1437                 if (ignore_if_in_upstream &&
1438                                 has_commit_patch_id(commit, &ids))
1439                         continue;
1440
1441                 nr++;
1442                 list = xrealloc(list, nr * sizeof(list[0]));
1443                 list[nr - 1] = commit;
1444         }
1445         if (nr == 0)
1446                 /* nothing to do */
1447                 return 0;
1448         total = nr;
1449         if (!keep_subject && auto_number && total > 1)
1450                 numbered = 1;
1451         if (numbered)
1452                 rev.total = total + start_number - 1;
1453         if (cover_letter == -1) {
1454                 if (config_cover_letter == COVER_AUTO)
1455                         cover_letter = (total > 1);
1456                 else
1457                         cover_letter = (config_cover_letter == COVER_ON);
1458         }
1459
1460         if (!signature) {
1461                 ; /* --no-signature inhibits all signatures */
1462         } else if (signature && signature != git_version_string) {
1463                 ; /* non-default signature already set */
1464         } else if (signature_file) {
1465                 struct strbuf buf = STRBUF_INIT;
1466
1467                 if (strbuf_read_file(&buf, signature_file, 128) < 0)
1468                         die_errno(_("unable to read signature file '%s'"), signature_file);
1469                 signature = strbuf_detach(&buf, NULL);
1470         }
1471
1472         if (in_reply_to || thread || cover_letter)
1473                 rev.ref_message_ids = xcalloc(1, sizeof(struct string_list));
1474         if (in_reply_to) {
1475                 const char *msgid = clean_message_id(in_reply_to);
1476                 string_list_append(rev.ref_message_ids, msgid);
1477         }
1478         rev.numbered_files = just_numbers;
1479         rev.patch_suffix = fmt_patch_suffix;
1480         if (cover_letter) {
1481                 if (thread)
1482                         gen_message_id(&rev, "cover");
1483                 make_cover_letter(&rev, use_stdout,
1484                                   origin, nr, list, branch_name, quiet);
1485                 total++;
1486                 start_number--;
1487         }
1488         rev.add_signoff = do_signoff;
1489         while (0 <= --nr) {
1490                 int shown;
1491                 commit = list[nr];
1492                 rev.nr = total - nr + (start_number - 1);
1493                 /* Make the second and subsequent mails replies to the first */
1494                 if (thread) {
1495                         /* Have we already had a message ID? */
1496                         if (rev.message_id) {
1497                                 /*
1498                                  * For deep threading: make every mail
1499                                  * a reply to the previous one, no
1500                                  * matter what other options are set.
1501                                  *
1502                                  * For shallow threading:
1503                                  *
1504                                  * Without --cover-letter and
1505                                  * --in-reply-to, make every mail a
1506                                  * reply to the one before.
1507                                  *
1508                                  * With --in-reply-to but no
1509                                  * --cover-letter, make every mail a
1510                                  * reply to the <reply-to>.
1511                                  *
1512                                  * With --cover-letter, make every
1513                                  * mail but the cover letter a reply
1514                                  * to the cover letter.  The cover
1515                                  * letter is a reply to the
1516                                  * --in-reply-to, if specified.
1517                                  */
1518                                 if (thread == THREAD_SHALLOW
1519                                     && rev.ref_message_ids->nr > 0
1520                                     && (!cover_letter || rev.nr > 1))
1521                                         free(rev.message_id);
1522                                 else
1523                                         string_list_append(rev.ref_message_ids,
1524                                                            rev.message_id);
1525                         }
1526                         gen_message_id(&rev, sha1_to_hex(commit->object.sha1));
1527                 }
1528
1529                 if (!use_stdout &&
1530                     reopen_stdout(rev.numbered_files ? NULL : commit, NULL, &rev, quiet))
1531                         die(_("Failed to create output files"));
1532                 shown = log_tree_commit(&rev, commit);
1533                 free(commit->buffer);
1534                 commit->buffer = NULL;
1535
1536                 /* We put one extra blank line between formatted
1537                  * patches and this flag is used by log-tree code
1538                  * to see if it needs to emit a LF before showing
1539                  * the log; when using one file per patch, we do
1540                  * not want the extra blank line.
1541                  */
1542                 if (!use_stdout)
1543                         rev.shown_one = 0;
1544                 if (shown) {
1545                         if (rev.mime_boundary)
1546                                 printf("\n--%s%s--\n\n\n",
1547                                        mime_boundary_leader,
1548                                        rev.mime_boundary);
1549                         else
1550                                 print_signature();
1551                 }
1552                 if (!use_stdout)
1553                         fclose(stdout);
1554         }
1555         free(list);
1556         free(branch_name);
1557         string_list_clear(&extra_to, 0);
1558         string_list_clear(&extra_cc, 0);
1559         string_list_clear(&extra_hdr, 0);
1560         if (ignore_if_in_upstream)
1561                 free_patch_ids(&ids);
1562         return 0;
1563 }
1564
1565 static int add_pending_commit(const char *arg, struct rev_info *revs, int flags)
1566 {
1567         unsigned char sha1[20];
1568         if (get_sha1(arg, sha1) == 0) {
1569                 struct commit *commit = lookup_commit_reference(sha1);
1570                 if (commit) {
1571                         commit->object.flags |= flags;
1572                         add_pending_object(revs, &commit->object, arg);
1573                         return 0;
1574                 }
1575         }
1576         return -1;
1577 }
1578
1579 static const char * const cherry_usage[] = {
1580         N_("git cherry [-v] [<upstream> [<head> [<limit>]]]"),
1581         NULL
1582 };
1583
1584 static void print_commit(char sign, struct commit *commit, int verbose,
1585                          int abbrev)
1586 {
1587         if (!verbose) {
1588                 printf("%c %s\n", sign,
1589                        find_unique_abbrev(commit->object.sha1, abbrev));
1590         } else {
1591                 struct strbuf buf = STRBUF_INIT;
1592                 pp_commit_easy(CMIT_FMT_ONELINE, commit, &buf);
1593                 printf("%c %s %s\n", sign,
1594                        find_unique_abbrev(commit->object.sha1, abbrev),
1595                        buf.buf);
1596                 strbuf_release(&buf);
1597         }
1598 }
1599
1600 int cmd_cherry(int argc, const char **argv, const char *prefix)
1601 {
1602         struct rev_info revs;
1603         struct patch_ids ids;
1604         struct commit *commit;
1605         struct commit_list *list = NULL;
1606         struct branch *current_branch;
1607         const char *upstream;
1608         const char *head = "HEAD";
1609         const char *limit = NULL;
1610         int verbose = 0, abbrev = 0;
1611
1612         struct option options[] = {
1613                 OPT__ABBREV(&abbrev),
1614                 OPT__VERBOSE(&verbose, N_("be verbose")),
1615                 OPT_END()
1616         };
1617
1618         argc = parse_options(argc, argv, prefix, options, cherry_usage, 0);
1619
1620         switch (argc) {
1621         case 3:
1622                 limit = argv[2];
1623                 /* FALLTHROUGH */
1624         case 2:
1625                 head = argv[1];
1626                 /* FALLTHROUGH */
1627         case 1:
1628                 upstream = argv[0];
1629                 break;
1630         default:
1631                 current_branch = branch_get(NULL);
1632                 if (!current_branch || !current_branch->merge
1633                                         || !current_branch->merge[0]
1634                                         || !current_branch->merge[0]->dst) {
1635                         fprintf(stderr, _("Could not find a tracked"
1636                                         " remote branch, please"
1637                                         " specify <upstream> manually.\n"));
1638                         usage_with_options(cherry_usage, options);
1639                 }
1640
1641                 upstream = current_branch->merge[0]->dst;
1642         }
1643
1644         init_revisions(&revs, prefix);
1645         revs.max_parents = 1;
1646
1647         if (add_pending_commit(head, &revs, 0))
1648                 die(_("Unknown commit %s"), head);
1649         if (add_pending_commit(upstream, &revs, UNINTERESTING))
1650                 die(_("Unknown commit %s"), upstream);
1651
1652         /* Don't say anything if head and upstream are the same. */
1653         if (revs.pending.nr == 2) {
1654                 struct object_array_entry *o = revs.pending.objects;
1655                 if (hashcmp(o[0].item->sha1, o[1].item->sha1) == 0)
1656                         return 0;
1657         }
1658
1659         get_patch_ids(&revs, &ids);
1660
1661         if (limit && add_pending_commit(limit, &revs, UNINTERESTING))
1662                 die(_("Unknown commit %s"), limit);
1663
1664         /* reverse the list of commits */
1665         if (prepare_revision_walk(&revs))
1666                 die(_("revision walk setup failed"));
1667         while ((commit = get_revision(&revs)) != NULL) {
1668                 commit_list_insert(commit, &list);
1669         }
1670
1671         while (list) {
1672                 char sign = '+';
1673
1674                 commit = list->item;
1675                 if (has_commit_patch_id(commit, &ids))
1676                         sign = '-';
1677                 print_commit(sign, commit, verbose, abbrev);
1678                 list = list->next;
1679         }
1680
1681         free_patch_ids(&ids);
1682         return 0;
1683 }