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

   1 #include "cache.h"
   2 #include "config.h"
   3 #include "diff.h"
   4 #include "object-store.h"
   5 #include "repository.h"
   6 #include "commit.h"
   7 #include "tag.h"
   8 #include "graph.h"
   9 #include "log-tree.h"
  10 #include "reflog-walk.h"
  11 #include "refs.h"
  12 #include "string-list.h"
  13 #include "color.h"
  14 #include "gpg-interface.h"
  15 #include "sequencer.h"
  16 #include "line-log.h"
  17 #include "help.h"
  18 #include "interdiff.h"
  19 #include "range-diff.h"
  20
  21 static struct decoration name_decoration = { "object names" };
  22 static int decoration_loaded;
  23 static int decoration_flags;
  24
  25 static char decoration_colors[][COLOR_MAXLEN] = {
  26         GIT_COLOR_RESET,
  27         GIT_COLOR_BOLD_GREEN,   /* REF_LOCAL */
  28         GIT_COLOR_BOLD_RED,     /* REF_REMOTE */
  29         GIT_COLOR_BOLD_YELLOW,  /* REF_TAG */
  30         GIT_COLOR_BOLD_MAGENTA, /* REF_STASH */
  31         GIT_COLOR_BOLD_CYAN,    /* REF_HEAD */
  32         GIT_COLOR_BOLD_BLUE,    /* GRAFTED */
  33 };
  34
  35 static const char *color_decorate_slots[] = {
  36         [DECORATION_REF_LOCAL]  = "branch",
  37         [DECORATION_REF_REMOTE] = "remoteBranch",
  38         [DECORATION_REF_TAG]    = "tag",
  39         [DECORATION_REF_STASH]  = "stash",
  40         [DECORATION_REF_HEAD]   = "HEAD",
  41         [DECORATION_GRAFTED]    = "grafted",
  42 };
  43
  44 static const char *decorate_get_color(int decorate_use_color, enum decoration_type ix)
  45 {
  46         if (want_color(decorate_use_color))
  47                 return decoration_colors[ix];
  48         return "";
  49 }
  50
  51 define_list_config_array(color_decorate_slots);
  52
  53 int parse_decorate_color_config(const char *var, const char *slot_name, const char *value)
  54 {
  55         int slot = LOOKUP_CONFIG(color_decorate_slots, slot_name);
  56         if (slot < 0)
  57                 return 0;
  58         if (!value)
  59                 return config_error_nonbool(var);
  60         return color_parse(value, decoration_colors[slot]);
  61 }
  62
  63 /*
  64  * log-tree.c uses DIFF_OPT_TST for determining whether to use color
  65  * for showing the commit sha1, use the same check for --decorate
  66  */
  67 #define decorate_get_color_opt(o, ix) \
  68         decorate_get_color((o)->use_color, ix)
  69
  70 void add_name_decoration(enum decoration_type type, const char *name, struct object *obj)
  71 {
  72         struct name_decoration *res;
  73         FLEX_ALLOC_STR(res, name, name);
  74         res->type = type;
  75         res->next = add_decoration(&name_decoration, obj, res);
  76 }
  77
  78 const struct name_decoration *get_name_decoration(const struct object *obj)
  79 {
  80         return lookup_decoration(&name_decoration, obj);
  81 }
  82
  83 static int add_ref_decoration(const char *refname, const struct object_id *oid,
  84                               int flags, void *cb_data)
  85 {
  86         struct object *obj;
  87         enum decoration_type type = DECORATION_NONE;
  88         struct decoration_filter *filter = (struct decoration_filter *)cb_data;
  89
  90         if (filter && !ref_filter_match(refname,
  91                               filter->include_ref_pattern,
  92                               filter->exclude_ref_pattern))
  93                 return 0;
  94
  95         if (starts_with(refname, git_replace_ref_base)) {
  96                 struct object_id original_oid;
  97                 if (!read_replace_refs)
  98                         return 0;
  99                 if (get_oid_hex(refname + strlen(git_replace_ref_base),
 100                                 &original_oid)) {
 101                         warning("invalid replace ref %s", refname);
 102                         return 0;
 103                 }
 104                 obj = parse_object(the_repository, &original_oid);
 105                 if (obj)
 106                         add_name_decoration(DECORATION_GRAFTED, "replaced", obj);
 107                 return 0;
 108         }
 109
 110         obj = parse_object(the_repository, oid);
 111         if (!obj)
 112                 return 0;
 113
 114         if (starts_with(refname, "refs/heads/"))
 115                 type = DECORATION_REF_LOCAL;
 116         else if (starts_with(refname, "refs/remotes/"))
 117                 type = DECORATION_REF_REMOTE;
 118         else if (starts_with(refname, "refs/tags/"))
 119                 type = DECORATION_REF_TAG;
 120         else if (!strcmp(refname, "refs/stash"))
 121                 type = DECORATION_REF_STASH;
 122         else if (!strcmp(refname, "HEAD"))
 123                 type = DECORATION_REF_HEAD;
 124
 125         add_name_decoration(type, refname, obj);
 126         while (obj->type == OBJ_TAG) {
 127                 obj = ((struct tag *)obj)->tagged;
 128                 if (!obj)
 129                         break;
 130                 if (!obj->parsed)
 131                         parse_object(the_repository, &obj->oid);
 132                 add_name_decoration(DECORATION_REF_TAG, refname, obj);
 133         }
 134         return 0;
 135 }
 136
 137 static int add_graft_decoration(const struct commit_graft *graft, void *cb_data)
 138 {
 139         struct commit *commit = lookup_commit(the_repository, &graft->oid);
 140         if (!commit)
 141                 return 0;
 142         add_name_decoration(DECORATION_GRAFTED, "grafted", &commit->object);
 143         return 0;
 144 }
 145
 146 void load_ref_decorations(struct decoration_filter *filter, int flags)
 147 {
 148         if (!decoration_loaded) {
 149                 if (filter) {
 150                         struct string_list_item *item;
 151                         for_each_string_list_item(item, filter->exclude_ref_pattern) {
 152                                 normalize_glob_ref(item, NULL, item->string);
 153                         }
 154                         for_each_string_list_item(item, filter->include_ref_pattern) {
 155                                 normalize_glob_ref(item, NULL, item->string);
 156                         }
 157                 }
 158                 decoration_loaded = 1;
 159                 decoration_flags = flags;
 160                 for_each_ref(add_ref_decoration, filter);
 161                 head_ref(add_ref_decoration, filter);
 162                 for_each_commit_graft(add_graft_decoration, filter);
 163         }
 164 }
 165
 166 static void show_parents(struct commit *commit, int abbrev, FILE *file)
 167 {
 168         struct commit_list *p;
 169         for (p = commit->parents; p ; p = p->next) {
 170                 struct commit *parent = p->item;
 171                 fprintf(file, " %s", find_unique_abbrev(&parent->object.oid, abbrev));
 172         }
 173 }
 174
 175 static void show_children(struct rev_info *opt, struct commit *commit, int abbrev)
 176 {
 177         struct commit_list *p = lookup_decoration(&opt->children, &commit->object);
 178         for ( ; p; p = p->next) {
 179                 fprintf(opt->diffopt.file, " %s", find_unique_abbrev(&p->item->object.oid, abbrev));
 180         }
 181 }
 182
 183 /*
 184  * Do we have HEAD in the output, and also the branch it points at?
 185  * If so, find that decoration entry for that current branch.
 186  */
 187 static const struct name_decoration *current_pointed_by_HEAD(const struct name_decoration *decoration)
 188 {
 189         const struct name_decoration *list, *head = NULL;
 190         const char *branch_name = NULL;
 191         int rru_flags;
 192
 193         /* First find HEAD */
 194         for (list = decoration; list; list = list->next)
 195                 if (list->type == DECORATION_REF_HEAD) {
 196                         head = list;
 197                         break;
 198                 }
 199         if (!head)
 200                 return NULL;
 201
 202         /* Now resolve and find the matching current branch */
 203         branch_name = resolve_ref_unsafe("HEAD", 0, NULL, &rru_flags);
 204         if (!branch_name || !(rru_flags & REF_ISSYMREF))
 205                 return NULL;
 206
 207         if (!starts_with(branch_name, "refs/"))
 208                 return NULL;
 209
 210         /* OK, do we have that ref in the list? */
 211         for (list = decoration; list; list = list->next)
 212                 if ((list->type == DECORATION_REF_LOCAL) &&
 213                     !strcmp(branch_name, list->name)) {
 214                         return list;
 215                 }
 216
 217         return NULL;
 218 }
 219
 220 static void show_name(struct strbuf *sb, const struct name_decoration *decoration)
 221 {
 222         if (decoration_flags == DECORATE_SHORT_REFS)
 223                 strbuf_addstr(sb, prettify_refname(decoration->name));
 224         else
 225                 strbuf_addstr(sb, decoration->name);
 226 }
 227
 228 /*
 229  * The caller makes sure there is no funny color before calling.
 230  * format_decorations_extended makes sure the same after return.
 231  */
 232 void format_decorations_extended(struct strbuf *sb,
 233                         const struct commit *commit,
 234                         int use_color,
 235                         const char *prefix,
 236                         const char *separator,
 237                         const char *suffix)
 238 {
 239         const struct name_decoration *decoration;
 240         const struct name_decoration *current_and_HEAD;
 241         const char *color_commit =
 242                 diff_get_color(use_color, DIFF_COMMIT);
 243         const char *color_reset =
 244                 decorate_get_color(use_color, DECORATION_NONE);
 245
 246         decoration = get_name_decoration(&commit->object);
 247         if (!decoration)
 248                 return;
 249
 250         current_and_HEAD = current_pointed_by_HEAD(decoration);
 251         while (decoration) {
 252                 /*
 253                  * When both current and HEAD are there, only
 254                  * show HEAD->current where HEAD would have
 255                  * appeared, skipping the entry for current.
 256                  */
 257                 if (decoration != current_and_HEAD) {
 258                         strbuf_addstr(sb, color_commit);
 259                         strbuf_addstr(sb, prefix);
 260                         strbuf_addstr(sb, color_reset);
 261                         strbuf_addstr(sb, decorate_get_color(use_color, decoration->type));
 262                         if (decoration->type == DECORATION_REF_TAG)
 263                                 strbuf_addstr(sb, "tag: ");
 264
 265                         show_name(sb, decoration);
 266
 267                         if (current_and_HEAD &&
 268                             decoration->type == DECORATION_REF_HEAD) {
 269                                 strbuf_addstr(sb, " -> ");
 270                                 strbuf_addstr(sb, color_reset);
 271                                 strbuf_addstr(sb, decorate_get_color(use_color, current_and_HEAD->type));
 272                                 show_name(sb, current_and_HEAD);
 273                         }
 274                         strbuf_addstr(sb, color_reset);
 275
 276                         prefix = separator;
 277                 }
 278                 decoration = decoration->next;
 279         }
 280         strbuf_addstr(sb, color_commit);
 281         strbuf_addstr(sb, suffix);
 282         strbuf_addstr(sb, color_reset);
 283 }
 284
 285 void show_decorations(struct rev_info *opt, struct commit *commit)
 286 {
 287         struct strbuf sb = STRBUF_INIT;
 288
 289         if (opt->sources) {
 290                 char **slot = revision_sources_peek(opt->sources, commit);
 291
 292                 if (slot && *slot)
 293                         fprintf(opt->diffopt.file, "\t%s", *slot);
 294         }
 295         if (!opt->show_decorations)
 296                 return;
 297         format_decorations(&sb, commit, opt->diffopt.use_color);
 298         fputs(sb.buf, opt->diffopt.file);
 299         strbuf_release(&sb);
 300 }
 301
 302 static unsigned int digits_in_number(unsigned int number)
 303 {
 304         unsigned int i = 10, result = 1;
 305         while (i <= number) {
 306                 i *= 10;
 307                 result++;
 308         }
 309         return result;
 310 }
 311
 312 void fmt_output_subject(struct strbuf *filename,
 313                         const char *subject,
 314                         struct rev_info *info)
 315 {
 316         const char *suffix = info->patch_suffix;
 317         int nr = info->nr;
 318         int start_len = filename->len;
 319         int max_len = start_len + FORMAT_PATCH_NAME_MAX - (strlen(suffix) + 1);
 320
 321         if (0 < info->reroll_count)
 322                 strbuf_addf(filename, "v%d-", info->reroll_count);
 323         strbuf_addf(filename, "%04d-%s", nr, subject);
 324
 325         if (max_len < filename->len)
 326                 strbuf_setlen(filename, max_len);
 327         strbuf_addstr(filename, suffix);
 328 }
 329
 330 void fmt_output_commit(struct strbuf *filename,
 331                        struct commit *commit,
 332                        struct rev_info *info)
 333 {
 334         struct pretty_print_context ctx = {0};
 335         struct strbuf subject = STRBUF_INIT;
 336
 337         format_commit_message(commit, "%f", &subject, &ctx);
 338         fmt_output_subject(filename, subject.buf, info);
 339         strbuf_release(&subject);
 340 }
 341
 342 void fmt_output_email_subject(struct strbuf *sb, struct rev_info *opt)
 343 {
 344         if (opt->total > 0) {
 345                 strbuf_addf(sb, "Subject: [%s%s%0*d/%d] ",
 346                             opt->subject_prefix,
 347                             *opt->subject_prefix ? " " : "",
 348                             digits_in_number(opt->total),
 349                             opt->nr, opt->total);
 350         } else if (opt->total == 0 && opt->subject_prefix && *opt->subject_prefix) {
 351                 strbuf_addf(sb, "Subject: [%s] ",
 352                             opt->subject_prefix);
 353         } else {
 354                 strbuf_addstr(sb, "Subject: ");
 355         }
 356 }
 357
 358 void log_write_email_headers(struct rev_info *opt, struct commit *commit,
 359                              const char **extra_headers_p,
 360                              int *need_8bit_cte_p,
 361                              int maybe_multipart)
 362 {
 363         const char *extra_headers = opt->extra_headers;
 364         const char *name = oid_to_hex(opt->zero_commit ?
 365                                       &null_oid : &commit->object.oid);
 366
 367         *need_8bit_cte_p = 0; /* unknown */
 368
 369         fprintf(opt->diffopt.file, "From %s Mon Sep 17 00:00:00 2001\n", name);
 370         graph_show_oneline(opt->graph);
 371         if (opt->message_id) {
 372                 fprintf(opt->diffopt.file, "Message-Id: <%s>\n", opt->message_id);
 373                 graph_show_oneline(opt->graph);
 374         }
 375         if (opt->ref_message_ids && opt->ref_message_ids->nr > 0) {
 376                 int i, n;
 377                 n = opt->ref_message_ids->nr;
 378                 fprintf(opt->diffopt.file, "In-Reply-To: <%s>\n", opt->ref_message_ids->items[n-1].string);
 379                 for (i = 0; i < n; i++)
 380                         fprintf(opt->diffopt.file, "%s<%s>\n", (i > 0 ? "\t" : "References: "),
 381                                opt->ref_message_ids->items[i].string);
 382                 graph_show_oneline(opt->graph);
 383         }
 384         if (opt->mime_boundary && maybe_multipart) {
 385                 static struct strbuf subject_buffer = STRBUF_INIT;
 386                 static struct strbuf buffer = STRBUF_INIT;
 387                 struct strbuf filename =  STRBUF_INIT;
 388                 *need_8bit_cte_p = -1; /* NEVER */
 389
 390                 strbuf_reset(&subject_buffer);
 391                 strbuf_reset(&buffer);
 392
 393                 strbuf_addf(&subject_buffer,
 394                          "%s"
 395                          "MIME-Version: 1.0\n"
 396                          "Content-Type: multipart/mixed;"
 397                          " boundary=\"%s%s\"\n"
 398                          "\n"
 399                          "This is a multi-part message in MIME "
 400                          "format.\n"
 401                          "--%s%s\n"
 402                          "Content-Type: text/plain; "
 403                          "charset=UTF-8; format=fixed\n"
 404                          "Content-Transfer-Encoding: 8bit\n\n",
 405                          extra_headers ? extra_headers : "",
 406                          mime_boundary_leader, opt->mime_boundary,
 407                          mime_boundary_leader, opt->mime_boundary);
 408                 extra_headers = subject_buffer.buf;
 409
 410                 if (opt->numbered_files)
 411                         strbuf_addf(&filename, "%d", opt->nr);
 412                 else
 413                         fmt_output_commit(&filename, commit, opt);
 414                 strbuf_addf(&buffer,
 415                          "\n--%s%s\n"
 416                          "Content-Type: text/x-patch;"
 417                          " name=\"%s\"\n"
 418                          "Content-Transfer-Encoding: 8bit\n"
 419                          "Content-Disposition: %s;"
 420                          " filename=\"%s\"\n\n",
 421                          mime_boundary_leader, opt->mime_boundary,
 422                          filename.buf,
 423                          opt->no_inline ? "attachment" : "inline",
 424                          filename.buf);
 425                 opt->diffopt.stat_sep = buffer.buf;
 426                 strbuf_release(&filename);
 427         }
 428         *extra_headers_p = extra_headers;
 429 }
 430
 431 static void show_sig_lines(struct rev_info *opt, int status, const char *bol)
 432 {
 433         const char *color, *reset, *eol;
 434
 435         color = diff_get_color_opt(&opt->diffopt,
 436                                    status ? DIFF_WHITESPACE : DIFF_FRAGINFO);
 437         reset = diff_get_color_opt(&opt->diffopt, DIFF_RESET);
 438         while (*bol) {
 439                 eol = strchrnul(bol, '\n');
 440                 fprintf(opt->diffopt.file, "%s%.*s%s%s", color, (int)(eol - bol), bol, reset,
 441                        *eol ? "\n" : "");
 442                 graph_show_oneline(opt->graph);
 443                 bol = (*eol) ? (eol + 1) : eol;
 444         }
 445 }
 446
 447 static void show_signature(struct rev_info *opt, struct commit *commit)
 448 {
 449         struct strbuf payload = STRBUF_INIT;
 450         struct strbuf signature = STRBUF_INIT;
 451         struct signature_check sigc = { 0 };
 452         int status;
 453
 454         if (parse_signed_commit(commit, &payload, &signature) <= 0)
 455                 goto out;
 456
 457         status = check_signature(payload.buf, payload.len, signature.buf,
 458                                  signature.len, &sigc);
 459         if (status && sigc.result == 'N')
 460                 show_sig_lines(opt, status, "No signature\n");
 461         else {
 462                 show_sig_lines(opt, status, sigc.gpg_output);
 463                 signature_check_clear(&sigc);
 464         }
 465
 466  out:
 467         strbuf_release(&payload);
 468         strbuf_release(&signature);
 469 }
 470
 471 static int which_parent(const struct object_id *oid, const struct commit *commit)
 472 {
 473         int nth;
 474         const struct commit_list *parent;
 475
 476         for (nth = 0, parent = commit->parents; parent; parent = parent->next) {
 477                 if (oideq(&parent->item->object.oid, oid))
 478                         return nth;
 479                 nth++;
 480         }
 481         return -1;
 482 }
 483
 484 static int is_common_merge(const struct commit *commit)
 485 {
 486         return (commit->parents
 487                 && commit->parents->next
 488                 && !commit->parents->next->next);
 489 }
 490
 491 static int show_one_mergetag(struct commit *commit,
 492                              struct commit_extra_header *extra,
 493                              void *data)
 494 {
 495         struct rev_info *opt = (struct rev_info *)data;
 496         struct object_id oid;
 497         struct tag *tag;
 498         struct strbuf verify_message;
 499         struct signature_check sigc = { 0 };
 500         int status, nth;
 501         size_t payload_size, gpg_message_offset;
 502
 503         hash_object_file(extra->value, extra->len, type_name(OBJ_TAG), &oid);
 504         tag = lookup_tag(the_repository, &oid);
 505         if (!tag)
 506                 return -1; /* error message already given */
 507
 508         strbuf_init(&verify_message, 256);
 509         if (parse_tag_buffer(the_repository, tag, extra->value, extra->len))
 510                 strbuf_addstr(&verify_message, "malformed mergetag\n");
 511         else if (is_common_merge(commit) &&
 512                  oideq(&tag->tagged->oid,
 513                        &commit->parents->next->item->object.oid))
 514                 strbuf_addf(&verify_message,
 515                             "merged tag '%s'\n", tag->tag);
 516         else if ((nth = which_parent(&tag->tagged->oid, commit)) < 0)
 517                 strbuf_addf(&verify_message, "tag %s names a non-parent %s\n",
 518                                     tag->tag, tag->tagged->oid.hash);
 519         else
 520                 strbuf_addf(&verify_message,
 521                             "parent #%d, tagged '%s'\n", nth + 1, tag->tag);
 522         gpg_message_offset = verify_message.len;
 523
 524         payload_size = parse_signature(extra->value, extra->len);
 525         status = -1;
 526         if (extra->len > payload_size) {
 527                 /* could have a good signature */
 528                 if (!check_signature(extra->value, payload_size,
 529                                      extra->value + payload_size,
 530                                      extra->len - payload_size, &sigc)) {
 531                         strbuf_addstr(&verify_message, sigc.gpg_output);
 532                         signature_check_clear(&sigc);
 533                         status = 0; /* good */
 534                 } else if (verify_message.len <= gpg_message_offset)
 535                         strbuf_addstr(&verify_message, "No signature\n");
 536                 /* otherwise we couldn't verify, which is shown as bad */
 537         }
 538
 539         show_sig_lines(opt, status, verify_message.buf);
 540         strbuf_release(&verify_message);
 541         return 0;
 542 }
 543
 544 static int show_mergetag(struct rev_info *opt, struct commit *commit)
 545 {
 546         return for_each_mergetag(show_one_mergetag, commit, opt);
 547 }
 548
 549 static void next_commentary_block(struct rev_info *opt, struct strbuf *sb)
 550 {
 551         const char *x = opt->shown_dashes ? "\n" : "---\n";
 552         if (sb)
 553                 strbuf_addstr(sb, x);
 554         else
 555                 fputs(x, opt->diffopt.file);
 556         opt->shown_dashes = 1;
 557 }
 558
 559 void show_log(struct rev_info *opt)
 560 {
 561         struct strbuf msgbuf = STRBUF_INIT;
 562         struct log_info *log = opt->loginfo;
 563         struct commit *commit = log->commit, *parent = log->parent;
 564         int abbrev_commit = opt->abbrev_commit ? opt->abbrev : the_hash_algo->hexsz;
 565         const char *extra_headers = opt->extra_headers;
 566         struct pretty_print_context ctx = {0};
 567
 568         opt->loginfo = NULL;
 569         if (!opt->verbose_header) {
 570                 graph_show_commit(opt->graph);
 571
 572                 if (!opt->graph)
 573                         put_revision_mark(opt, commit);
 574                 fputs(find_unique_abbrev(&commit->object.oid, abbrev_commit), opt->diffopt.file);
 575                 if (opt->print_parents)
 576                         show_parents(commit, abbrev_commit, opt->diffopt.file);
 577                 if (opt->children.name)
 578                         show_children(opt, commit, abbrev_commit);
 579                 show_decorations(opt, commit);
 580                 if (opt->graph && !graph_is_commit_finished(opt->graph)) {
 581                         putc('\n', opt->diffopt.file);
 582                         graph_show_remainder(opt->graph);
 583                 }
 584                 putc(opt->diffopt.line_termination, opt->diffopt.file);
 585                 return;
 586         }
 587
 588         /*
 589          * If use_terminator is set, we already handled any record termination
 590          * at the end of the last record.
 591          * Otherwise, add a diffopt.line_termination character before all
 592          * entries but the first.  (IOW, as a separator between entries)
 593          */
 594         if (opt->shown_one && !opt->use_terminator) {
 595                 /*
 596                  * If entries are separated by a newline, the output
 597                  * should look human-readable.  If the last entry ended
 598                  * with a newline, print the graph output before this
 599                  * newline.  Otherwise it will end up as a completely blank
 600                  * line and will look like a gap in the graph.
 601                  *
 602                  * If the entry separator is not a newline, the output is
 603                  * primarily intended for programmatic consumption, and we
 604                  * never want the extra graph output before the entry
 605                  * separator.
 606                  */
 607                 if (opt->diffopt.line_termination == '\n' &&
 608                     !opt->missing_newline)
 609                         graph_show_padding(opt->graph);
 610                 putc(opt->diffopt.line_termination, opt->diffopt.file);
 611         }
 612         opt->shown_one = 1;
 613
 614         /*
 615          * If the history graph was requested,
 616          * print the graph, up to this commit's line
 617          */
 618         graph_show_commit(opt->graph);
 619
 620         /*
 621          * Print header line of header..
 622          */
 623
 624         if (cmit_fmt_is_mail(opt->commit_format)) {
 625                 log_write_email_headers(opt, commit, &extra_headers,
 626                                         &ctx.need_8bit_cte, 1);
 627                 ctx.rev = opt;
 628                 ctx.print_email_subject = 1;
 629         } else if (opt->commit_format != CMIT_FMT_USERFORMAT) {
 630                 fputs(diff_get_color_opt(&opt->diffopt, DIFF_COMMIT), opt->diffopt.file);
 631                 if (opt->commit_format != CMIT_FMT_ONELINE)
 632                         fputs("commit ", opt->diffopt.file);
 633
 634                 if (!opt->graph)
 635                         put_revision_mark(opt, commit);
 636                 fputs(find_unique_abbrev(&commit->object.oid,
 637                                          abbrev_commit),
 638                       opt->diffopt.file);
 639                 if (opt->print_parents)
 640                         show_parents(commit, abbrev_commit, opt->diffopt.file);
 641                 if (opt->children.name)
 642                         show_children(opt, commit, abbrev_commit);
 643                 if (parent)
 644                         fprintf(opt->diffopt.file, " (from %s)",
 645                                find_unique_abbrev(&parent->object.oid, abbrev_commit));
 646                 fputs(diff_get_color_opt(&opt->diffopt, DIFF_RESET), opt->diffopt.file);
 647                 show_decorations(opt, commit);
 648                 if (opt->commit_format == CMIT_FMT_ONELINE) {
 649                         putc(' ', opt->diffopt.file);
 650                 } else {
 651                         putc('\n', opt->diffopt.file);
 652                         graph_show_oneline(opt->graph);
 653                 }
 654                 if (opt->reflog_info) {
 655                         /*
 656                          * setup_revisions() ensures that opt->reflog_info
 657                          * and opt->graph cannot both be set,
 658                          * so we don't need to worry about printing the
 659                          * graph info here.
 660                          */
 661                         show_reflog_message(opt->reflog_info,
 662                                             opt->commit_format == CMIT_FMT_ONELINE,
 663                                             &opt->date_mode,
 664                                             opt->date_mode_explicit);
 665                         if (opt->commit_format == CMIT_FMT_ONELINE)
 666                                 return;
 667                 }
 668         }
 669
 670         if (opt->show_signature) {
 671                 show_signature(opt, commit);
 672                 show_mergetag(opt, commit);
 673         }
 674
 675         if (opt->show_notes) {
 676                 int raw;
 677                 struct strbuf notebuf = STRBUF_INIT;
 678
 679                 raw = (opt->commit_format == CMIT_FMT_USERFORMAT);
 680                 format_display_notes(&commit->object.oid, &notebuf,
 681                                      get_log_output_encoding(), raw);
 682                 ctx.notes_message = notebuf.len
 683                         ? strbuf_detach(&notebuf, NULL)
 684                         : xcalloc(1, 1);
 685         }
 686
 687         /*
 688          * And then the pretty-printed message itself
 689          */
 690         if (ctx.need_8bit_cte >= 0 && opt->add_signoff)
 691                 ctx.need_8bit_cte =
 692                         has_non_ascii(fmt_name(WANT_COMMITTER_IDENT));
 693         ctx.date_mode = opt->date_mode;
 694         ctx.date_mode_explicit = opt->date_mode_explicit;
 695         ctx.abbrev = opt->diffopt.abbrev;
 696         ctx.after_subject = extra_headers;
 697         ctx.preserve_subject = opt->preserve_subject;
 698         ctx.reflog_info = opt->reflog_info;
 699         ctx.fmt = opt->commit_format;
 700         ctx.mailmap = opt->mailmap;
 701         ctx.color = opt->diffopt.use_color;
 702         ctx.expand_tabs_in_log = opt->expand_tabs_in_log;
 703         ctx.output_encoding = get_log_output_encoding();
 704         ctx.rev = opt;
 705         if (opt->from_ident.mail_begin && opt->from_ident.name_begin)
 706                 ctx.from_ident = &opt->from_ident;
 707         if (opt->graph)
 708                 ctx.graph_width = graph_width(opt->graph);
 709         pretty_print_commit(&ctx, commit, &msgbuf);
 710
 711         if (opt->add_signoff)
 712                 append_signoff(&msgbuf, 0, APPEND_SIGNOFF_DEDUP);
 713
 714         if ((ctx.fmt != CMIT_FMT_USERFORMAT) &&
 715             ctx.notes_message && *ctx.notes_message) {
 716                 if (cmit_fmt_is_mail(ctx.fmt))
 717                         next_commentary_block(opt, &msgbuf);
 718                 strbuf_addstr(&msgbuf, ctx.notes_message);
 719         }
 720
 721         if (opt->show_log_size) {
 722                 fprintf(opt->diffopt.file, "log size %i\n", (int)msgbuf.len);
 723                 graph_show_oneline(opt->graph);
 724         }
 725
 726         /*
 727          * Set opt->missing_newline if msgbuf doesn't
 728          * end in a newline (including if it is empty)
 729          */
 730         if (!msgbuf.len || msgbuf.buf[msgbuf.len - 1] != '\n')
 731                 opt->missing_newline = 1;
 732         else
 733                 opt->missing_newline = 0;
 734
 735         graph_show_commit_msg(opt->graph, opt->diffopt.file, &msgbuf);
 736         if (opt->use_terminator && !commit_format_is_empty(opt->commit_format)) {
 737                 if (!opt->missing_newline)
 738                         graph_show_padding(opt->graph);
 739                 putc(opt->diffopt.line_termination, opt->diffopt.file);
 740         }
 741
 742         strbuf_release(&msgbuf);
 743         free(ctx.notes_message);
 744
 745         if (cmit_fmt_is_mail(ctx.fmt) && opt->idiff_oid1) {
 746                 struct diff_queue_struct dq;
 747
 748                 memcpy(&dq, &diff_queued_diff, sizeof(diff_queued_diff));
 749                 DIFF_QUEUE_CLEAR(&diff_queued_diff);
 750
 751                 next_commentary_block(opt, NULL);
 752                 fprintf_ln(opt->diffopt.file, "%s", opt->idiff_title);
 753                 show_interdiff(opt, 2);
 754
 755                 memcpy(&diff_queued_diff, &dq, sizeof(diff_queued_diff));
 756         }
 757
 758         if (cmit_fmt_is_mail(ctx.fmt) && opt->rdiff1) {
 759                 struct diff_queue_struct dq;
 760                 struct diff_options opts;
 761
 762                 memcpy(&dq, &diff_queued_diff, sizeof(diff_queued_diff));
 763                 DIFF_QUEUE_CLEAR(&diff_queued_diff);
 764
 765                 next_commentary_block(opt, NULL);
 766                 fprintf_ln(opt->diffopt.file, "%s", opt->rdiff_title);
 767                 /*
 768                  * Pass minimum required diff-options to range-diff; others
 769                  * can be added later if deemed desirable.
 770                  */
 771                 diff_setup(&opts);
 772                 opts.file = opt->diffopt.file;
 773                 opts.use_color = opt->diffopt.use_color;
 774                 diff_setup_done(&opts);
 775                 show_range_diff(opt->rdiff1, opt->rdiff2,
 776                                 opt->creation_factor, 1, &opts);
 777
 778                 memcpy(&diff_queued_diff, &dq, sizeof(diff_queued_diff));
 779         }
 780 }
 781
 782 int log_tree_diff_flush(struct rev_info *opt)
 783 {
 784         opt->shown_dashes = 0;
 785         diffcore_std(&opt->diffopt);
 786
 787         if (diff_queue_is_empty()) {
 788                 int saved_fmt = opt->diffopt.output_format;
 789                 opt->diffopt.output_format = DIFF_FORMAT_NO_OUTPUT;
 790                 diff_flush(&opt->diffopt);
 791                 opt->diffopt.output_format = saved_fmt;
 792                 return 0;
 793         }
 794
 795         if (opt->loginfo && !opt->no_commit_id) {
 796                 show_log(opt);
 797                 if ((opt->diffopt.output_format & ~DIFF_FORMAT_NO_OUTPUT) &&
 798                     opt->verbose_header &&
 799                     opt->commit_format != CMIT_FMT_ONELINE &&
 800                     !commit_format_is_empty(opt->commit_format)) {
 801                         /*
 802                          * When showing a verbose header (i.e. log message),
 803                          * and not in --pretty=oneline format, we would want
 804                          * an extra newline between the end of log and the
 805                          * diff/diffstat output for readability.
 806                          */
 807                         int pch = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_PATCH;
 808                         if (opt->diffopt.output_prefix) {
 809                                 struct strbuf *msg = NULL;
 810                                 msg = opt->diffopt.output_prefix(&opt->diffopt,
 811                                         opt->diffopt.output_prefix_data);
 812                                 fwrite(msg->buf, msg->len, 1, opt->diffopt.file);
 813                         }
 814
 815                         /*
 816                          * We may have shown three-dashes line early
 817                          * between generated commentary (notes, etc.)
 818                          * and the log message, in which case we only
 819                          * want a blank line after the commentary
 820                          * without (an extra) three-dashes line.
 821                          * Otherwise, we show the three-dashes line if
 822                          * we are showing the patch with diffstat, but
 823                          * in that case, there is no extra blank line
 824                          * after the three-dashes line.
 825                          */
 826                         if (!opt->shown_dashes &&
 827                             (pch & opt->diffopt.output_format) == pch)
 828                                 fprintf(opt->diffopt.file, "---");
 829                         putc('\n', opt->diffopt.file);
 830                 }
 831         }
 832         diff_flush(&opt->diffopt);
 833         return 1;
 834 }
 835
 836 static int do_diff_combined(struct rev_info *opt, struct commit *commit)
 837 {
 838         diff_tree_combined_merge(commit, opt->dense_combined_merges, opt);
 839         return !opt->loginfo;
 840 }
 841
 842 /*
 843  * Show the diff of a commit.
 844  *
 845  * Return true if we printed any log info messages
 846  */
 847 static int log_tree_diff(struct rev_info *opt, struct commit *commit, struct log_info *log)
 848 {
 849         int showed_log;
 850         struct commit_list *parents;
 851         struct object_id *oid;
 852
 853         if (!opt->diff && !opt->diffopt.flags.exit_with_status)
 854                 return 0;
 855
 856         parse_commit_or_die(commit);
 857         oid = get_commit_tree_oid(commit);
 858
 859         /* Root commit? */
 860         parents = get_saved_parents(opt, commit);
 861         if (!parents) {
 862                 if (opt->show_root_diff) {
 863                         diff_root_tree_oid(oid, "", &opt->diffopt);
 864                         log_tree_diff_flush(opt);
 865                 }
 866                 return !opt->loginfo;
 867         }
 868
 869         /* More than one parent? */
 870         if (parents && parents->next) {
 871                 if (opt->ignore_merges)
 872                         return 0;
 873                 else if (opt->combine_merges)
 874                         return do_diff_combined(opt, commit);
 875                 else if (opt->first_parent_only) {
 876                         /*
 877                          * Generate merge log entry only for the first
 878                          * parent, showing summary diff of the others
 879                          * we merged _in_.
 880                          */
 881                         parse_commit_or_die(parents->item);
 882                         diff_tree_oid(get_commit_tree_oid(parents->item),
 883                                       oid, "", &opt->diffopt);
 884                         log_tree_diff_flush(opt);
 885                         return !opt->loginfo;
 886                 }
 887
 888                 /* If we show individual diffs, show the parent info */
 889                 log->parent = parents->item;
 890         }
 891
 892         showed_log = 0;
 893         for (;;) {
 894                 struct commit *parent = parents->item;
 895
 896                 parse_commit_or_die(parent);
 897                 diff_tree_oid(get_commit_tree_oid(parent),
 898                               oid, "", &opt->diffopt);
 899                 log_tree_diff_flush(opt);
 900
 901                 showed_log |= !opt->loginfo;
 902
 903                 /* Set up the log info for the next parent, if any.. */
 904                 parents = parents->next;
 905                 if (!parents)
 906                         break;
 907                 log->parent = parents->item;
 908                 opt->loginfo = log;
 909         }
 910         return showed_log;
 911 }
 912
 913 int log_tree_commit(struct rev_info *opt, struct commit *commit)
 914 {
 915         struct log_info log;
 916         int shown, close_file = opt->diffopt.close_file;
 917
 918         log.commit = commit;
 919         log.parent = NULL;
 920         opt->loginfo = &log;
 921         opt->diffopt.close_file = 0;
 922
 923         if (opt->line_level_traverse)
 924                 return line_log_print(opt, commit);
 925
 926         if (opt->track_linear && !opt->linear && !opt->reverse_output_stage)
 927                 fprintf(opt->diffopt.file, "\n%s\n", opt->break_bar);
 928         shown = log_tree_diff(opt, commit, &log);
 929         if (!shown && opt->loginfo && opt->always_show_header) {
 930                 log.parent = NULL;
 931                 show_log(opt);
 932                 shown = 1;
 933         }
 934         if (opt->track_linear && !opt->linear && opt->reverse_output_stage)
 935                 fprintf(opt->diffopt.file, "\n%s\n", opt->break_bar);
 936         opt->loginfo = NULL;
 937         maybe_flush_or_die(opt->diffopt.file, "stdout");
 938         if (close_file)
 939                 fclose(opt->diffopt.file);
 940         return shown;
 941 }