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