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         load_ref_decorations(NULL, DECORATE_SHORT_REFS);
  81         return lookup_decoration(&name_decoration, obj);
  82 }
  83
  84 static int add_ref_decoration(const char *refname, const struct object_id *oid,
  85                               int flags, void *cb_data)
  86 {
  87         struct object *obj;
  88         enum decoration_type type = DECORATION_NONE;
  89         struct decoration_filter *filter = (struct decoration_filter *)cb_data;
  90
  91         if (filter && !ref_filter_match(refname,
  92                               filter->include_ref_pattern,
  93                               filter->exclude_ref_pattern))
  94                 return 0;
  95
  96         if (starts_with(refname, git_replace_ref_base)) {
  97                 struct object_id original_oid;
  98                 if (!read_replace_refs)
  99                         return 0;
 100                 if (get_oid_hex(refname + strlen(git_replace_ref_base),
 101                                 &original_oid)) {
 102                         warning("invalid replace ref %s", refname);
 103                         return 0;
 104                 }
 105                 obj = parse_object(the_repository, &original_oid);
 106                 if (obj)
 107                         add_name_decoration(DECORATION_GRAFTED, "replaced", obj);
 108                 return 0;
 109         }
 110
 111         obj = parse_object(the_repository, oid);
 112         if (!obj)
 113                 return 0;
 114
 115         if (starts_with(refname, "refs/heads/"))
 116                 type = DECORATION_REF_LOCAL;
 117         else if (starts_with(refname, "refs/remotes/"))
 118                 type = DECORATION_REF_REMOTE;
 119         else if (starts_with(refname, "refs/tags/"))
 120                 type = DECORATION_REF_TAG;
 121         else if (!strcmp(refname, "refs/stash"))
 122                 type = DECORATION_REF_STASH;
 123         else if (!strcmp(refname, "HEAD"))
 124                 type = DECORATION_REF_HEAD;
 125
 126         add_name_decoration(type, refname, obj);
 127         while (obj->type == OBJ_TAG) {
 128                 obj = ((struct tag *)obj)->tagged;
 129                 if (!obj)
 130                         break;
 131                 if (!obj->parsed)
 132                         parse_object(the_repository, &obj->oid);
 133                 add_name_decoration(DECORATION_REF_TAG, refname, obj);
 134         }
 135         return 0;
 136 }
 137
 138 static int add_graft_decoration(const struct commit_graft *graft, void *cb_data)
 139 {
 140         struct commit *commit = lookup_commit(the_repository, &graft->oid);
 141         if (!commit)
 142                 return 0;
 143         add_name_decoration(DECORATION_GRAFTED, "grafted", &commit->object);
 144         return 0;
 145 }
 146
 147 void load_ref_decorations(struct decoration_filter *filter, int flags)
 148 {
 149         if (!decoration_loaded) {
 150                 if (filter) {
 151                         struct string_list_item *item;
 152                         for_each_string_list_item(item, filter->exclude_ref_pattern) {
 153                                 normalize_glob_ref(item, NULL, item->string);
 154                         }
 155                         for_each_string_list_item(item, filter->include_ref_pattern) {
 156                                 normalize_glob_ref(item, NULL, item->string);
 157                         }
 158                 }
 159                 decoration_loaded = 1;
 160                 decoration_flags = flags;
 161                 for_each_ref(add_ref_decoration, filter);
 162                 head_ref(add_ref_decoration, filter);
 163                 for_each_commit_graft(add_graft_decoration, filter);
 164         }
 165 }
 166
 167 static void show_parents(struct commit *commit, int abbrev, FILE *file)
 168 {
 169         struct commit_list *p;
 170         for (p = commit->parents; p ; p = p->next) {
 171                 struct commit *parent = p->item;
 172                 fprintf(file, " %s", find_unique_abbrev(&parent->object.oid, abbrev));
 173         }
 174 }
 175
 176 static void show_children(struct rev_info *opt, struct commit *commit, int abbrev)
 177 {
 178         struct commit_list *p = lookup_decoration(&opt->children, &commit->object);
 179         for ( ; p; p = p->next) {
 180                 fprintf(opt->diffopt.file, " %s", find_unique_abbrev(&p->item->object.oid, abbrev));
 181         }
 182 }
 183
 184 /*
 185  * Do we have HEAD in the output, and also the branch it points at?
 186  * If so, find that decoration entry for that current branch.
 187  */
 188 static const struct name_decoration *current_pointed_by_HEAD(const struct name_decoration *decoration)
 189 {
 190         const struct name_decoration *list, *head = NULL;
 191         const char *branch_name = NULL;
 192         int rru_flags;
 193
 194         /* First find HEAD */
 195         for (list = decoration; list; list = list->next)
 196                 if (list->type == DECORATION_REF_HEAD) {
 197                         head = list;
 198                         break;
 199                 }
 200         if (!head)
 201                 return NULL;
 202
 203         /* Now resolve and find the matching current branch */
 204         branch_name = resolve_ref_unsafe("HEAD", 0, NULL, &rru_flags);
 205         if (!branch_name || !(rru_flags & REF_ISSYMREF))
 206                 return NULL;
 207
 208         if (!starts_with(branch_name, "refs/"))
 209                 return NULL;
 210
 211         /* OK, do we have that ref in the list? */
 212         for (list = decoration; list; list = list->next)
 213                 if ((list->type == DECORATION_REF_LOCAL) &&
 214                     !strcmp(branch_name, list->name)) {
 215                         return list;
 216                 }
 217
 218         return NULL;
 219 }
 220
 221 static void show_name(struct strbuf *sb, const struct name_decoration *decoration)
 222 {
 223         if (decoration_flags == DECORATE_SHORT_REFS)
 224                 strbuf_addstr(sb, prettify_refname(decoration->name));
 225         else
 226                 strbuf_addstr(sb, decoration->name);
 227 }
 228
 229 /*
 230  * The caller makes sure there is no funny color before calling.
 231  * format_decorations_extended makes sure the same after return.
 232  */
 233 void format_decorations_extended(struct strbuf *sb,
 234                         const struct commit *commit,
 235                         int use_color,
 236                         const char *prefix,
 237                         const char *separator,
 238                         const char *suffix)
 239 {
 240         const struct name_decoration *decoration;
 241         const struct name_decoration *current_and_HEAD;
 242         const char *color_commit =
 243                 diff_get_color(use_color, DIFF_COMMIT);
 244         const char *color_reset =
 245                 decorate_get_color(use_color, DECORATION_NONE);
 246
 247         decoration = get_name_decoration(&commit->object);
 248         if (!decoration)
 249                 return;
 250
 251         current_and_HEAD = current_pointed_by_HEAD(decoration);
 252         while (decoration) {
 253                 /*
 254                  * When both current and HEAD are there, only
 255                  * show HEAD->current where HEAD would have
 256                  * appeared, skipping the entry for current.
 257                  */
 258                 if (decoration != current_and_HEAD) {
 259                         strbuf_addstr(sb, color_commit);
 260                         strbuf_addstr(sb, prefix);
 261                         strbuf_addstr(sb, color_reset);
 262                         strbuf_addstr(sb, decorate_get_color(use_color, decoration->type));
 263                         if (decoration->type == DECORATION_REF_TAG)
 264                                 strbuf_addstr(sb, "tag: ");
 265
 266                         show_name(sb, decoration);
 267
 268                         if (current_and_HEAD &&
 269                             decoration->type == DECORATION_REF_HEAD) {
 270                                 strbuf_addstr(sb, " -> ");
 271                                 strbuf_addstr(sb, color_reset);
 272                                 strbuf_addstr(sb, decorate_get_color(use_color, current_and_HEAD->type));
 273                                 show_name(sb, current_and_HEAD);
 274                         }
 275                         strbuf_addstr(sb, color_reset);
 276
 277                         prefix = separator;
 278                 }
 279                 decoration = decoration->next;
 280         }
 281         strbuf_addstr(sb, color_commit);
 282         strbuf_addstr(sb, suffix);
 283         strbuf_addstr(sb, color_reset);
 284 }
 285
 286 void show_decorations(struct rev_info *opt, struct commit *commit)
 287 {
 288         struct strbuf sb = STRBUF_INIT;
 289
 290         if (opt->sources) {
 291                 char **slot = revision_sources_peek(opt->sources, commit);
 292
 293                 if (slot && *slot)
 294                         fprintf(opt->diffopt.file, "\t%s", *slot);
 295         }
 296         if (!opt->show_decorations)
 297                 return;
 298         format_decorations(&sb, commit, opt->diffopt.use_color);
 299         fputs(sb.buf, opt->diffopt.file);
 300         strbuf_release(&sb);
 301 }
 302
 303 static unsigned int digits_in_number(unsigned int number)
 304 {
 305         unsigned int i = 10, result = 1;
 306         while (i <= number) {
 307                 i *= 10;
 308                 result++;
 309         }
 310         return result;
 311 }
 312
 313 void fmt_output_subject(struct strbuf *filename,
 314                         const char *subject,
 315                         struct rev_info *info)
 316 {
 317         const char *suffix = info->patch_suffix;
 318         int nr = info->nr;
 319         int start_len = filename->len;
 320         int max_len = start_len + FORMAT_PATCH_NAME_MAX - (strlen(suffix) + 1);
 321
 322         if (0 < info->reroll_count)
 323                 strbuf_addf(filename, "v%d-", info->reroll_count);
 324         strbuf_addf(filename, "%04d-%s", nr, subject);
 325
 326         if (max_len < filename->len)
 327                 strbuf_setlen(filename, max_len);
 328         strbuf_addstr(filename, suffix);
 329 }
 330
 331 void fmt_output_commit(struct strbuf *filename,
 332                        struct commit *commit,
 333                        struct rev_info *info)
 334 {
 335         struct pretty_print_context ctx = {0};
 336         struct strbuf subject = STRBUF_INIT;
 337
 338         format_commit_message(commit, "%f", &subject, &ctx);
 339         fmt_output_subject(filename, subject.buf, info);
 340         strbuf_release(&subject);
 341 }
 342
 343 void fmt_output_email_subject(struct strbuf *sb, struct rev_info *opt)
 344 {
 345         if (opt->total > 0) {
 346                 strbuf_addf(sb, "Subject: [%s%s%0*d/%d] ",
 347                             opt->subject_prefix,
 348                             *opt->subject_prefix ? " " : "",
 349                             digits_in_number(opt->total),
 350                             opt->nr, opt->total);
 351         } else if (opt->total == 0 && opt->subject_prefix && *opt->subject_prefix) {
 352                 strbuf_addf(sb, "Subject: [%s] ",
 353                             opt->subject_prefix);
 354         } else {
 355                 strbuf_addstr(sb, "Subject: ");
 356         }
 357 }
 358
 359 void log_write_email_headers(struct rev_info *opt, struct commit *commit,
 360                              const char **extra_headers_p,
 361                              int *need_8bit_cte_p,
 362                              int maybe_multipart)
 363 {
 364         const char *extra_headers = opt->extra_headers;
 365         const char *name = oid_to_hex(opt->zero_commit ?
 366                                       &null_oid : &commit->object.oid);
 367
 368         *need_8bit_cte_p = 0; /* unknown */
 369
 370         fprintf(opt->diffopt.file, "From %s Mon Sep 17 00:00:00 2001\n", name);
 371         graph_show_oneline(opt->graph);
 372         if (opt->message_id) {
 373                 fprintf(opt->diffopt.file, "Message-Id: <%s>\n", opt->message_id);
 374                 graph_show_oneline(opt->graph);
 375         }
 376         if (opt->ref_message_ids && opt->ref_message_ids->nr > 0) {
 377                 int i, n;
 378                 n = opt->ref_message_ids->nr;
 379                 fprintf(opt->diffopt.file, "In-Reply-To: <%s>\n", opt->ref_message_ids->items[n-1].string);
 380                 for (i = 0; i < n; i++)
 381                         fprintf(opt->diffopt.file, "%s<%s>\n", (i > 0 ? "\t" : "References: "),
 382                                opt->ref_message_ids->items[i].string);
 383                 graph_show_oneline(opt->graph);
 384         }
 385         if (opt->mime_boundary && maybe_multipart) {
 386                 static struct strbuf subject_buffer = STRBUF_INIT;
 387                 static struct strbuf buffer = STRBUF_INIT;
 388                 struct strbuf filename =  STRBUF_INIT;
 389                 *need_8bit_cte_p = -1; /* NEVER */
 390
 391                 strbuf_reset(&subject_buffer);
 392                 strbuf_reset(&buffer);
 393
 394                 strbuf_addf(&subject_buffer,
 395                          "%s"
 396                          "MIME-Version: 1.0\n"
 397                          "Content-Type: multipart/mixed;"
 398                          " boundary=\"%s%s\"\n"
 399                          "\n"
 400                          "This is a multi-part message in MIME "
 401                          "format.\n"
 402                          "--%s%s\n"
 403                          "Content-Type: text/plain; "
 404                          "charset=UTF-8; format=fixed\n"
 405                          "Content-Transfer-Encoding: 8bit\n\n",
 406                          extra_headers ? extra_headers : "",
 407                          mime_boundary_leader, opt->mime_boundary,
 408                          mime_boundary_leader, opt->mime_boundary);
 409                 extra_headers = subject_buffer.buf;
 410
 411                 if (opt->numbered_files)
 412                         strbuf_addf(&filename, "%d", opt->nr);
 413                 else
 414                         fmt_output_commit(&filename, commit, opt);
 415                 strbuf_addf(&buffer,
 416                          "\n--%s%s\n"
 417                          "Content-Type: text/x-patch;"
 418                          " name=\"%s\"\n"
 419                          "Content-Transfer-Encoding: 8bit\n"
 420                          "Content-Disposition: %s;"
 421                          " filename=\"%s\"\n\n",
 422                          mime_boundary_leader, opt->mime_boundary,
 423                          filename.buf,
 424                          opt->no_inline ? "attachment" : "inline",
 425                          filename.buf);
 426                 opt->diffopt.stat_sep = buffer.buf;
 427                 strbuf_release(&filename);
 428         }
 429         *extra_headers_p = extra_headers;
 430 }
 431
 432 static void show_sig_lines(struct rev_info *opt, int status, const char *bol)
 433 {
 434         const char *color, *reset, *eol;
 435
 436         color = diff_get_color_opt(&opt->diffopt,
 437                                    status ? DIFF_WHITESPACE : DIFF_FRAGINFO);
 438         reset = diff_get_color_opt(&opt->diffopt, DIFF_RESET);
 439         while (*bol) {
 440                 eol = strchrnul(bol, '\n');
 441                 fprintf(opt->diffopt.file, "%s%.*s%s%s", color, (int)(eol - bol), bol, reset,
 442                        *eol ? "\n" : "");
 443                 graph_show_oneline(opt->graph);
 444                 bol = (*eol) ? (eol + 1) : eol;
 445         }
 446 }
 447
 448 static void show_signature(struct rev_info *opt, struct commit *commit)
 449 {
 450         struct strbuf payload = STRBUF_INIT;
 451         struct strbuf signature = STRBUF_INIT;
 452         struct strbuf gpg_output = STRBUF_INIT;
 453         int status;
 454
 455         if (parse_signed_commit(commit, &payload, &signature) <= 0)
 456                 goto out;
 457
 458         status = verify_signed_buffer(payload.buf, payload.len,
 459                                       signature.buf, signature.len,
 460                                       &gpg_output, NULL);
 461         if (status && !gpg_output.len)
 462                 strbuf_addstr(&gpg_output, "No signature\n");
 463
 464         show_sig_lines(opt, status, gpg_output.buf);
 465
 466  out:
 467         strbuf_release(&gpg_output);
 468         strbuf_release(&payload);
 469         strbuf_release(&signature);
 470 }
 471
 472 static int which_parent(const struct object_id *oid, const struct commit *commit)
 473 {
 474         int nth;
 475         const struct commit_list *parent;
 476
 477         for (nth = 0, parent = commit->parents; parent; parent = parent->next) {
 478                 if (oideq(&parent->item->object.oid, oid))
 479                         return nth;
 480                 nth++;
 481         }
 482         return -1;
 483 }
 484
 485 static int is_common_merge(const struct commit *commit)
 486 {
 487         return (commit->parents
 488                 && commit->parents->next
 489                 && !commit->parents->next->next);
 490 }
 491
 492 static int show_one_mergetag(struct commit *commit,
 493                              struct commit_extra_header *extra,
 494                              void *data)
 495 {
 496         struct rev_info *opt = (struct rev_info *)data;
 497         struct object_id oid;
 498         struct tag *tag;
 499         struct strbuf verify_message;
 500         int status, nth;
 501         size_t payload_size, gpg_message_offset;
 502
 503         hash_object_file(the_hash_algo, extra->value, extra->len,
 504                          type_name(OBJ_TAG), &oid);
 505         tag = lookup_tag(the_repository, &oid);
 506         if (!tag)
 507                 return -1; /* error message already given */
 508
 509         strbuf_init(&verify_message, 256);
 510         if (parse_tag_buffer(the_repository, tag, extra->value, extra->len))
 511                 strbuf_addstr(&verify_message, "malformed mergetag\n");
 512         else if (is_common_merge(commit) &&
 513                  oideq(&tag->tagged->oid,
 514                        &commit->parents->next->item->object.oid))
 515                 strbuf_addf(&verify_message,
 516                             "merged tag '%s'\n", tag->tag);
 517         else if ((nth = which_parent(&tag->tagged->oid, commit)) < 0)
 518                 strbuf_addf(&verify_message, "tag %s names a non-parent %s\n",
 519                                     tag->tag, tag->tagged->oid.hash);
 520         else
 521                 strbuf_addf(&verify_message,
 522                             "parent #%d, tagged '%s'\n", nth + 1, tag->tag);
 523         gpg_message_offset = verify_message.len;
 524
 525         payload_size = parse_signature(extra->value, extra->len);
 526         status = -1;
 527         if (extra->len > payload_size) {
 528                 /* could have a good signature */
 529                 if (!verify_signed_buffer(extra->value, payload_size,
 530                                           extra->value + payload_size,
 531                                           extra->len - payload_size,
 532                                           &verify_message, NULL))
 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 = strbuf_detach(&notebuf, NULL);
 683         }
 684
 685         /*
 686          * And then the pretty-printed message itself
 687          */
 688         if (ctx.need_8bit_cte >= 0 && opt->add_signoff)
 689                 ctx.need_8bit_cte =
 690                         has_non_ascii(fmt_name(WANT_COMMITTER_IDENT));
 691         ctx.date_mode = opt->date_mode;
 692         ctx.date_mode_explicit = opt->date_mode_explicit;
 693         ctx.abbrev = opt->diffopt.abbrev;
 694         ctx.after_subject = extra_headers;
 695         ctx.preserve_subject = opt->preserve_subject;
 696         ctx.reflog_info = opt->reflog_info;
 697         ctx.fmt = opt->commit_format;
 698         ctx.mailmap = opt->mailmap;
 699         ctx.color = opt->diffopt.use_color;
 700         ctx.expand_tabs_in_log = opt->expand_tabs_in_log;
 701         ctx.output_encoding = get_log_output_encoding();
 702         ctx.rev = opt;
 703         if (opt->from_ident.mail_begin && opt->from_ident.name_begin)
 704                 ctx.from_ident = &opt->from_ident;
 705         if (opt->graph)
 706                 ctx.graph_width = graph_width(opt->graph);
 707         pretty_print_commit(&ctx, commit, &msgbuf);
 708
 709         if (opt->add_signoff)
 710                 append_signoff(&msgbuf, 0, APPEND_SIGNOFF_DEDUP);
 711
 712         if ((ctx.fmt != CMIT_FMT_USERFORMAT) &&
 713             ctx.notes_message && *ctx.notes_message) {
 714                 if (cmit_fmt_is_mail(ctx.fmt))
 715                         next_commentary_block(opt, &msgbuf);
 716                 strbuf_addstr(&msgbuf, ctx.notes_message);
 717         }
 718
 719         if (opt->show_log_size) {
 720                 fprintf(opt->diffopt.file, "log size %i\n", (int)msgbuf.len);
 721                 graph_show_oneline(opt->graph);
 722         }
 723
 724         /*
 725          * Set opt->missing_newline if msgbuf doesn't
 726          * end in a newline (including if it is empty)
 727          */
 728         if (!msgbuf.len || msgbuf.buf[msgbuf.len - 1] != '\n')
 729                 opt->missing_newline = 1;
 730         else
 731                 opt->missing_newline = 0;
 732
 733         graph_show_commit_msg(opt->graph, opt->diffopt.file, &msgbuf);
 734         if (opt->use_terminator && !commit_format_is_empty(opt->commit_format)) {
 735                 if (!opt->missing_newline)
 736                         graph_show_padding(opt->graph);
 737                 putc(opt->diffopt.line_termination, opt->diffopt.file);
 738         }
 739
 740         strbuf_release(&msgbuf);
 741         free(ctx.notes_message);
 742
 743         if (cmit_fmt_is_mail(ctx.fmt) && opt->idiff_oid1) {
 744                 struct diff_queue_struct dq;
 745
 746                 memcpy(&dq, &diff_queued_diff, sizeof(diff_queued_diff));
 747                 DIFF_QUEUE_CLEAR(&diff_queued_diff);
 748
 749                 next_commentary_block(opt, NULL);
 750                 fprintf_ln(opt->diffopt.file, "%s", opt->idiff_title);
 751                 show_interdiff(opt, 2);
 752
 753                 memcpy(&diff_queued_diff, &dq, sizeof(diff_queued_diff));
 754         }
 755
 756         if (cmit_fmt_is_mail(ctx.fmt) && opt->rdiff1) {
 757                 struct diff_queue_struct dq;
 758                 struct diff_options opts;
 759
 760                 memcpy(&dq, &diff_queued_diff, sizeof(diff_queued_diff));
 761                 DIFF_QUEUE_CLEAR(&diff_queued_diff);
 762
 763                 next_commentary_block(opt, NULL);
 764                 fprintf_ln(opt->diffopt.file, "%s", opt->rdiff_title);
 765                 /*
 766                  * Pass minimum required diff-options to range-diff; others
 767                  * can be added later if deemed desirable.
 768                  */
 769                 diff_setup(&opts);
 770                 opts.file = opt->diffopt.file;
 771                 opts.use_color = opt->diffopt.use_color;
 772                 diff_setup_done(&opts);
 773                 show_range_diff(opt->rdiff1, opt->rdiff2,
 774                                 opt->creation_factor, 1, &opts, NULL);
 775
 776                 memcpy(&diff_queued_diff, &dq, sizeof(diff_queued_diff));
 777         }
 778 }
 779
 780 int log_tree_diff_flush(struct rev_info *opt)
 781 {
 782         opt->shown_dashes = 0;
 783         diffcore_std(&opt->diffopt);
 784
 785         if (diff_queue_is_empty()) {
 786                 int saved_fmt = opt->diffopt.output_format;
 787                 opt->diffopt.output_format = DIFF_FORMAT_NO_OUTPUT;
 788                 diff_flush(&opt->diffopt);
 789                 opt->diffopt.output_format = saved_fmt;
 790                 return 0;
 791         }
 792
 793         if (opt->loginfo && !opt->no_commit_id) {
 794                 show_log(opt);
 795                 if ((opt->diffopt.output_format & ~DIFF_FORMAT_NO_OUTPUT) &&
 796                     opt->verbose_header &&
 797                     opt->commit_format != CMIT_FMT_ONELINE &&
 798                     !commit_format_is_empty(opt->commit_format)) {
 799                         /*
 800                          * When showing a verbose header (i.e. log message),
 801                          * and not in --pretty=oneline format, we would want
 802                          * an extra newline between the end of log and the
 803                          * diff/diffstat output for readability.
 804                          */
 805                         int pch = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_PATCH;
 806                         if (opt->diffopt.output_prefix) {
 807                                 struct strbuf *msg = NULL;
 808                                 msg = opt->diffopt.output_prefix(&opt->diffopt,
 809                                         opt->diffopt.output_prefix_data);
 810                                 fwrite(msg->buf, msg->len, 1, opt->diffopt.file);
 811                         }
 812
 813                         /*
 814                          * We may have shown three-dashes line early
 815                          * between generated commentary (notes, etc.)
 816                          * and the log message, in which case we only
 817                          * want a blank line after the commentary
 818                          * without (an extra) three-dashes line.
 819                          * Otherwise, we show the three-dashes line if
 820                          * we are showing the patch with diffstat, but
 821                          * in that case, there is no extra blank line
 822                          * after the three-dashes line.
 823                          */
 824                         if (!opt->shown_dashes &&
 825                             (pch & opt->diffopt.output_format) == pch)
 826                                 fprintf(opt->diffopt.file, "---");
 827                         putc('\n', opt->diffopt.file);
 828                 }
 829         }
 830         diff_flush(&opt->diffopt);
 831         return 1;
 832 }
 833
 834 static int do_diff_combined(struct rev_info *opt, struct commit *commit)
 835 {
 836         diff_tree_combined_merge(commit, opt->dense_combined_merges, opt);
 837         return !opt->loginfo;
 838 }
 839
 840 /*
 841  * Show the diff of a commit.
 842  *
 843  * Return true if we printed any log info messages
 844  */
 845 static int log_tree_diff(struct rev_info *opt, struct commit *commit, struct log_info *log)
 846 {
 847         int showed_log;
 848         struct commit_list *parents;
 849         struct object_id *oid;
 850
 851         if (!opt->diff && !opt->diffopt.flags.exit_with_status)
 852                 return 0;
 853
 854         parse_commit_or_die(commit);
 855         oid = get_commit_tree_oid(commit);
 856
 857         /* Root commit? */
 858         parents = get_saved_parents(opt, commit);
 859         if (!parents) {
 860                 if (opt->show_root_diff) {
 861                         diff_root_tree_oid(oid, "", &opt->diffopt);
 862                         log_tree_diff_flush(opt);
 863                 }
 864                 return !opt->loginfo;
 865         }
 866
 867         /* More than one parent? */
 868         if (parents && parents->next) {
 869                 if (opt->ignore_merges)
 870                         return 0;
 871                 else if (opt->combine_merges)
 872                         return do_diff_combined(opt, commit);
 873                 else if (opt->first_parent_only) {
 874                         /*
 875                          * Generate merge log entry only for the first
 876                          * parent, showing summary diff of the others
 877                          * we merged _in_.
 878                          */
 879                         parse_commit_or_die(parents->item);
 880                         diff_tree_oid(get_commit_tree_oid(parents->item),
 881                                       oid, "", &opt->diffopt);
 882                         log_tree_diff_flush(opt);
 883                         return !opt->loginfo;
 884                 }
 885
 886                 /* If we show individual diffs, show the parent info */
 887                 log->parent = parents->item;
 888         }
 889
 890         showed_log = 0;
 891         for (;;) {
 892                 struct commit *parent = parents->item;
 893
 894                 parse_commit_or_die(parent);
 895                 diff_tree_oid(get_commit_tree_oid(parent),
 896                               oid, "", &opt->diffopt);
 897                 log_tree_diff_flush(opt);
 898
 899                 showed_log |= !opt->loginfo;
 900
 901                 /* Set up the log info for the next parent, if any.. */
 902                 parents = parents->next;
 903                 if (!parents)
 904                         break;
 905                 log->parent = parents->item;
 906                 opt->loginfo = log;
 907         }
 908         return showed_log;
 909 }
 910
 911 int log_tree_commit(struct rev_info *opt, struct commit *commit)
 912 {
 913         struct log_info log;
 914         int shown, close_file = opt->diffopt.close_file;
 915
 916         log.commit = commit;
 917         log.parent = NULL;
 918         opt->loginfo = &log;
 919         opt->diffopt.close_file = 0;
 920
 921         if (opt->line_level_traverse)
 922                 return line_log_print(opt, commit);
 923
 924         if (opt->track_linear && !opt->linear && !opt->reverse_output_stage)
 925                 fprintf(opt->diffopt.file, "\n%s\n", opt->break_bar);
 926         shown = log_tree_diff(opt, commit, &log);
 927         if (!shown && opt->loginfo && opt->always_show_header) {
 928                 log.parent = NULL;
 929                 show_log(opt);
 930                 shown = 1;
 931         }
 932         if (opt->track_linear && !opt->linear && opt->reverse_output_stage)
 933                 fprintf(opt->diffopt.file, "\n%s\n", opt->break_bar);
 934         opt->loginfo = NULL;
 935         maybe_flush_or_die(opt->diffopt.file, "stdout");
 936         if (close_file)
 937                 fclose(opt->diffopt.file);
 938         return shown;
 939 }