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

   1 #include "cache.h"
   2 #include "config.h"
   3 #include "diff.h"
   4 #include "commit.h"
   5 #include "tag.h"
   6 #include "graph.h"
   7 #include "log-tree.h"
   8 #include "reflog-walk.h"
   9 #include "refs.h"
  10 #include "string-list.h"
  11 #include "color.h"
  12 #include "gpg-interface.h"
  13 #include "sequencer.h"
  14 #include "line-log.h"
  15 #include "help.h"
  16
  17 static struct decoration name_decoration = { "object names" };
  18 static int decoration_loaded;
  19 static int decoration_flags;
  20
  21 static char decoration_colors[][COLOR_MAXLEN] = {
  22         GIT_COLOR_RESET,
  23         GIT_COLOR_BOLD_GREEN,   /* REF_LOCAL */
  24         GIT_COLOR_BOLD_RED,     /* REF_REMOTE */
  25         GIT_COLOR_BOLD_YELLOW,  /* REF_TAG */
  26         GIT_COLOR_BOLD_MAGENTA, /* REF_STASH */
  27         GIT_COLOR_BOLD_CYAN,    /* REF_HEAD */
  28         GIT_COLOR_BOLD_BLUE,    /* GRAFTED */
  29 };
  30
  31 static const char *color_decorate_slots[] = {
  32         [DECORATION_REF_LOCAL]  = "branch",
  33         [DECORATION_REF_REMOTE] = "remoteBranch",
  34         [DECORATION_REF_TAG]    = "tag",
  35         [DECORATION_REF_STASH]  = "stash",
  36         [DECORATION_REF_HEAD]   = "HEAD",
  37         [DECORATION_GRAFTED]    = "grafted",
  38 };
  39
  40 static const char *decorate_get_color(int decorate_use_color, enum decoration_type ix)
  41 {
  42         if (want_color(decorate_use_color))
  43                 return decoration_colors[ix];
  44         return "";
  45 }
  46
  47 define_list_config_array(color_decorate_slots);
  48
  49 int parse_decorate_color_config(const char *var, const char *slot_name, const char *value)
  50 {
  51         int slot = LOOKUP_CONFIG(color_decorate_slots, slot_name);
  52         if (slot < 0)
  53                 return 0;
  54         if (!value)
  55                 return config_error_nonbool(var);
  56         return color_parse(value, decoration_colors[slot]);
  57 }
  58
  59 /*
  60  * log-tree.c uses DIFF_OPT_TST for determining whether to use color
  61  * for showing the commit sha1, use the same check for --decorate
  62  */
  63 #define decorate_get_color_opt(o, ix) \
  64         decorate_get_color((o)->use_color, ix)
  65
  66 void add_name_decoration(enum decoration_type type, const char *name, struct object *obj)
  67 {
  68         struct name_decoration *res;
  69         FLEX_ALLOC_STR(res, name, name);
  70         res->type = type;
  71         res->next = add_decoration(&name_decoration, obj, res);
  72 }
  73
  74 const struct name_decoration *get_name_decoration(const struct object *obj)
  75 {
  76         return lookup_decoration(&name_decoration, obj);
  77 }
  78
  79 static int add_ref_decoration(const char *refname, const struct object_id *oid,
  80                               int flags, void *cb_data)
  81 {
  82         struct object *obj;
  83         enum decoration_type type = DECORATION_NONE;
  84         struct decoration_filter *filter = (struct decoration_filter *)cb_data;
  85
  86         if (filter && !ref_filter_match(refname,
  87                               filter->include_ref_pattern,
  88                               filter->exclude_ref_pattern))
  89                 return 0;
  90
  91         if (starts_with(refname, git_replace_ref_base)) {
  92                 struct object_id original_oid;
  93                 if (!check_replace_refs)
  94                         return 0;
  95                 if (get_oid_hex(refname + strlen(git_replace_ref_base),
  96                                 &original_oid)) {
  97                         warning("invalid replace ref %s", refname);
  98                         return 0;
  99                 }
 100                 obj = parse_object(&original_oid);
 101                 if (obj)
 102                         add_name_decoration(DECORATION_GRAFTED, "replaced", obj);
 103                 return 0;
 104         }
 105
 106         obj = parse_object(oid);
 107         if (!obj)
 108                 return 0;
 109
 110         if (starts_with(refname, "refs/heads/"))
 111                 type = DECORATION_REF_LOCAL;
 112         else if (starts_with(refname, "refs/remotes/"))
 113                 type = DECORATION_REF_REMOTE;
 114         else if (starts_with(refname, "refs/tags/"))
 115                 type = DECORATION_REF_TAG;
 116         else if (!strcmp(refname, "refs/stash"))
 117                 type = DECORATION_REF_STASH;
 118         else if (!strcmp(refname, "HEAD"))
 119                 type = DECORATION_REF_HEAD;
 120
 121         add_name_decoration(type, refname, obj);
 122         while (obj->type == OBJ_TAG) {
 123                 obj = ((struct tag *)obj)->tagged;
 124                 if (!obj)
 125                         break;
 126                 if (!obj->parsed)
 127                         parse_object(&obj->oid);
 128                 add_name_decoration(DECORATION_REF_TAG, refname, obj);
 129         }
 130         return 0;
 131 }
 132
 133 static int add_graft_decoration(const struct commit_graft *graft, void *cb_data)
 134 {
 135         struct commit *commit = lookup_commit(&graft->oid);
 136         if (!commit)
 137                 return 0;
 138         add_name_decoration(DECORATION_GRAFTED, "grafted", &commit->object);
 139         return 0;
 140 }
 141
 142 void load_ref_decorations(struct decoration_filter *filter, int flags)
 143 {
 144         if (!decoration_loaded) {
 145                 if (filter) {
 146                         struct string_list_item *item;
 147                         for_each_string_list_item(item, filter->exclude_ref_pattern) {
 148                                 normalize_glob_ref(item, NULL, item->string);
 149                         }
 150                         for_each_string_list_item(item, filter->include_ref_pattern) {
 151                                 normalize_glob_ref(item, NULL, item->string);
 152                         }
 153                 }
 154                 decoration_loaded = 1;
 155                 decoration_flags = flags;
 156                 for_each_ref(add_ref_decoration, filter);
 157                 head_ref(add_ref_decoration, filter);
 158                 for_each_commit_graft(add_graft_decoration, filter);
 159         }
 160 }
 161
 162 static void show_parents(struct commit *commit, int abbrev, FILE *file)
 163 {
 164         struct commit_list *p;
 165         for (p = commit->parents; p ; p = p->next) {
 166                 struct commit *parent = p->item;
 167                 fprintf(file, " %s", find_unique_abbrev(&parent->object.oid, abbrev));
 168         }
 169 }
 170
 171 static void show_children(struct rev_info *opt, struct commit *commit, int abbrev)
 172 {
 173         struct commit_list *p = lookup_decoration(&opt->children, &commit->object);
 174         for ( ; p; p = p->next) {
 175                 fprintf(opt->diffopt.file, " %s", find_unique_abbrev(&p->item->object.oid, abbrev));
 176         }
 177 }
 178
 179 /*
 180  * Do we have HEAD in the output, and also the branch it points at?
 181  * If so, find that decoration entry for that current branch.
 182  */
 183 static const struct name_decoration *current_pointed_by_HEAD(const struct name_decoration *decoration)
 184 {
 185         const struct name_decoration *list, *head = NULL;
 186         const char *branch_name = NULL;
 187         int rru_flags;
 188
 189         /* First find HEAD */
 190         for (list = decoration; list; list = list->next)
 191                 if (list->type == DECORATION_REF_HEAD) {
 192                         head = list;
 193                         break;
 194                 }
 195         if (!head)
 196                 return NULL;
 197
 198         /* Now resolve and find the matching current branch */
 199         branch_name = resolve_ref_unsafe("HEAD", 0, NULL, &rru_flags);
 200         if (!branch_name || !(rru_flags & REF_ISSYMREF))
 201                 return NULL;
 202
 203         if (!starts_with(branch_name, "refs/"))
 204                 return NULL;
 205
 206         /* OK, do we have that ref in the list? */
 207         for (list = decoration; list; list = list->next)
 208                 if ((list->type == DECORATION_REF_LOCAL) &&
 209                     !strcmp(branch_name, list->name)) {
 210                         return list;
 211                 }
 212
 213         return NULL;
 214 }
 215
 216 static void show_name(struct strbuf *sb, const struct name_decoration *decoration)
 217 {
 218         if (decoration_flags == DECORATE_SHORT_REFS)
 219                 strbuf_addstr(sb, prettify_refname(decoration->name));
 220         else
 221                 strbuf_addstr(sb, decoration->name);
 222 }
 223
 224 /*
 225  * The caller makes sure there is no funny color before calling.
 226  * format_decorations_extended makes sure the same after return.
 227  */
 228 void format_decorations_extended(struct strbuf *sb,
 229                         const struct commit *commit,
 230                         int use_color,
 231                         const char *prefix,
 232                         const char *separator,
 233                         const char *suffix)
 234 {
 235         const struct name_decoration *decoration;
 236         const struct name_decoration *current_and_HEAD;
 237         const char *color_commit =
 238                 diff_get_color(use_color, DIFF_COMMIT);
 239         const char *color_reset =
 240                 decorate_get_color(use_color, DECORATION_NONE);
 241
 242         decoration = get_name_decoration(&commit->object);
 243         if (!decoration)
 244                 return;
 245
 246         current_and_HEAD = current_pointed_by_HEAD(decoration);
 247         while (decoration) {
 248                 /*
 249                  * When both current and HEAD are there, only
 250                  * show HEAD->current where HEAD would have
 251                  * appeared, skipping the entry for current.
 252                  */
 253                 if (decoration != current_and_HEAD) {
 254                         strbuf_addstr(sb, color_commit);
 255                         strbuf_addstr(sb, prefix);
 256                         strbuf_addstr(sb, color_reset);
 257                         strbuf_addstr(sb, decorate_get_color(use_color, decoration->type));
 258                         if (decoration->type == DECORATION_REF_TAG)
 259                                 strbuf_addstr(sb, "tag: ");
 260
 261                         show_name(sb, decoration);
 262
 263                         if (current_and_HEAD &&
 264                             decoration->type == DECORATION_REF_HEAD) {
 265                                 strbuf_addstr(sb, " -> ");
 266                                 strbuf_addstr(sb, color_reset);
 267                                 strbuf_addstr(sb, decorate_get_color(use_color, current_and_HEAD->type));
 268                                 show_name(sb, current_and_HEAD);
 269                         }
 270                         strbuf_addstr(sb, color_reset);
 271
 272                         prefix = separator;
 273                 }
 274                 decoration = decoration->next;
 275         }
 276         strbuf_addstr(sb, color_commit);
 277         strbuf_addstr(sb, suffix);
 278         strbuf_addstr(sb, color_reset);
 279 }
 280
 281 void show_decorations(struct rev_info *opt, struct commit *commit)
 282 {
 283         struct strbuf sb = STRBUF_INIT;
 284
 285         if (opt->sources) {
 286                 char **slot = revision_sources_peek(opt->sources, commit);
 287
 288                 if (slot && *slot)
 289                         fprintf(opt->diffopt.file, "\t%s", *slot);
 290         }
 291         if (!opt->show_decorations)
 292                 return;
 293         format_decorations(&sb, commit, opt->diffopt.use_color);
 294         fputs(sb.buf, opt->diffopt.file);
 295         strbuf_release(&sb);
 296 }
 297
 298 static unsigned int digits_in_number(unsigned int number)
 299 {
 300         unsigned int i = 10, result = 1;
 301         while (i <= number) {
 302                 i *= 10;
 303                 result++;
 304         }
 305         return result;
 306 }
 307
 308 void fmt_output_subject(struct strbuf *filename,
 309                         const char *subject,
 310                         struct rev_info *info)
 311 {
 312         const char *suffix = info->patch_suffix;
 313         int nr = info->nr;
 314         int start_len = filename->len;
 315         int max_len = start_len + FORMAT_PATCH_NAME_MAX - (strlen(suffix) + 1);
 316
 317         if (0 < info->reroll_count)
 318                 strbuf_addf(filename, "v%d-", info->reroll_count);
 319         strbuf_addf(filename, "%04d-%s", nr, subject);
 320
 321         if (max_len < filename->len)
 322                 strbuf_setlen(filename, max_len);
 323         strbuf_addstr(filename, suffix);
 324 }
 325
 326 void fmt_output_commit(struct strbuf *filename,
 327                        struct commit *commit,
 328                        struct rev_info *info)
 329 {
 330         struct pretty_print_context ctx = {0};
 331         struct strbuf subject = STRBUF_INIT;
 332
 333         format_commit_message(commit, "%f", &subject, &ctx);
 334         fmt_output_subject(filename, subject.buf, info);
 335         strbuf_release(&subject);
 336 }
 337
 338 void fmt_output_email_subject(struct strbuf *sb, struct rev_info *opt)
 339 {
 340         if (opt->total > 0) {
 341                 strbuf_addf(sb, "Subject: [%s%s%0*d/%d] ",
 342                             opt->subject_prefix,
 343                             *opt->subject_prefix ? " " : "",
 344                             digits_in_number(opt->total),
 345                             opt->nr, opt->total);
 346         } else if (opt->total == 0 && opt->subject_prefix && *opt->subject_prefix) {
 347                 strbuf_addf(sb, "Subject: [%s] ",
 348                             opt->subject_prefix);
 349         } else {
 350                 strbuf_addstr(sb, "Subject: ");
 351         }
 352 }
 353
 354 void log_write_email_headers(struct rev_info *opt, struct commit *commit,
 355                              const char **extra_headers_p,
 356                              int *need_8bit_cte_p,
 357                              int maybe_multipart)
 358 {
 359         const char *extra_headers = opt->extra_headers;
 360         const char *name = oid_to_hex(opt->zero_commit ?
 361                                       &null_oid : &commit->object.oid);
 362
 363         *need_8bit_cte_p = 0; /* unknown */
 364
 365         fprintf(opt->diffopt.file, "From %s Mon Sep 17 00:00:00 2001\n", name);
 366         graph_show_oneline(opt->graph);
 367         if (opt->message_id) {
 368                 fprintf(opt->diffopt.file, "Message-Id: <%s>\n", opt->message_id);
 369                 graph_show_oneline(opt->graph);
 370         }
 371         if (opt->ref_message_ids && opt->ref_message_ids->nr > 0) {
 372                 int i, n;
 373                 n = opt->ref_message_ids->nr;
 374                 fprintf(opt->diffopt.file, "In-Reply-To: <%s>\n", opt->ref_message_ids->items[n-1].string);
 375                 for (i = 0; i < n; i++)
 376                         fprintf(opt->diffopt.file, "%s<%s>\n", (i > 0 ? "\t" : "References: "),
 377                                opt->ref_message_ids->items[i].string);
 378                 graph_show_oneline(opt->graph);
 379         }
 380         if (opt->mime_boundary && maybe_multipart) {
 381                 static struct strbuf subject_buffer = STRBUF_INIT;
 382                 static struct strbuf buffer = STRBUF_INIT;
 383                 struct strbuf filename =  STRBUF_INIT;
 384                 *need_8bit_cte_p = -1; /* NEVER */
 385
 386                 strbuf_reset(&subject_buffer);
 387                 strbuf_reset(&buffer);
 388
 389                 strbuf_addf(&subject_buffer,
 390                          "%s"
 391                          "MIME-Version: 1.0\n"
 392                          "Content-Type: multipart/mixed;"
 393                          " boundary=\"%s%s\"\n"
 394                          "\n"
 395                          "This is a multi-part message in MIME "
 396                          "format.\n"
 397                          "--%s%s\n"
 398                          "Content-Type: text/plain; "
 399                          "charset=UTF-8; format=fixed\n"
 400                          "Content-Transfer-Encoding: 8bit\n\n",
 401                          extra_headers ? extra_headers : "",
 402                          mime_boundary_leader, opt->mime_boundary,
 403                          mime_boundary_leader, opt->mime_boundary);
 404                 extra_headers = subject_buffer.buf;
 405
 406                 if (opt->numbered_files)
 407                         strbuf_addf(&filename, "%d", opt->nr);
 408                 else
 409                         fmt_output_commit(&filename, commit, opt);
 410                 strbuf_addf(&buffer,
 411                          "\n--%s%s\n"
 412                          "Content-Type: text/x-patch;"
 413                          " name=\"%s\"\n"
 414                          "Content-Transfer-Encoding: 8bit\n"
 415                          "Content-Disposition: %s;"
 416                          " filename=\"%s\"\n\n",
 417                          mime_boundary_leader, opt->mime_boundary,
 418                          filename.buf,
 419                          opt->no_inline ? "attachment" : "inline",
 420                          filename.buf);
 421                 opt->diffopt.stat_sep = buffer.buf;
 422                 strbuf_release(&filename);
 423         }
 424         *extra_headers_p = extra_headers;
 425 }
 426
 427 static void show_sig_lines(struct rev_info *opt, int status, const char *bol)
 428 {
 429         const char *color, *reset, *eol;
 430
 431         color = diff_get_color_opt(&opt->diffopt,
 432                                    status ? DIFF_WHITESPACE : DIFF_FRAGINFO);
 433         reset = diff_get_color_opt(&opt->diffopt, DIFF_RESET);
 434         while (*bol) {
 435                 eol = strchrnul(bol, '\n');
 436                 fprintf(opt->diffopt.file, "%s%.*s%s%s", color, (int)(eol - bol), bol, reset,
 437                        *eol ? "\n" : "");
 438                 graph_show_oneline(opt->graph);
 439                 bol = (*eol) ? (eol + 1) : eol;
 440         }
 441 }
 442
 443 static void show_signature(struct rev_info *opt, struct commit *commit)
 444 {
 445         struct strbuf payload = STRBUF_INIT;
 446         struct strbuf signature = STRBUF_INIT;
 447         struct strbuf gpg_output = STRBUF_INIT;
 448         int status;
 449
 450         if (parse_signed_commit(commit, &payload, &signature) <= 0)
 451                 goto out;
 452
 453         status = verify_signed_buffer(payload.buf, payload.len,
 454                                       signature.buf, signature.len,
 455                                       &gpg_output, NULL);
 456         if (status && !gpg_output.len)
 457                 strbuf_addstr(&gpg_output, "No signature\n");
 458
 459         show_sig_lines(opt, status, gpg_output.buf);
 460
 461  out:
 462         strbuf_release(&gpg_output);
 463         strbuf_release(&payload);
 464         strbuf_release(&signature);
 465 }
 466
 467 static int which_parent(const struct object_id *oid, const struct commit *commit)
 468 {
 469         int nth;
 470         const struct commit_list *parent;
 471
 472         for (nth = 0, parent = commit->parents; parent; parent = parent->next) {
 473                 if (!oidcmp(&parent->item->object.oid, oid))
 474                         return nth;
 475                 nth++;
 476         }
 477         return -1;
 478 }
 479
 480 static int is_common_merge(const struct commit *commit)
 481 {
 482         return (commit->parents
 483                 && commit->parents->next
 484                 && !commit->parents->next->next);
 485 }
 486
 487 static int show_one_mergetag(struct commit *commit,
 488                              struct commit_extra_header *extra,
 489                              void *data)
 490 {
 491         struct rev_info *opt = (struct rev_info *)data;
 492         struct object_id oid;
 493         struct tag *tag;
 494         struct strbuf verify_message;
 495         int status, nth;
 496         size_t payload_size, gpg_message_offset;
 497
 498         hash_object_file(extra->value, extra->len, type_name(OBJ_TAG), &oid);
 499         tag = lookup_tag(&oid);
 500         if (!tag)
 501                 return -1; /* error message already given */
 502
 503         strbuf_init(&verify_message, 256);
 504         if (parse_tag_buffer(tag, extra->value, extra->len))
 505                 strbuf_addstr(&verify_message, "malformed mergetag\n");
 506         else if (is_common_merge(commit) &&
 507                  !oidcmp(&tag->tagged->oid,
 508                           &commit->parents->next->item->object.oid))
 509                 strbuf_addf(&verify_message,
 510                             "merged tag '%s'\n", tag->tag);
 511         else if ((nth = which_parent(&tag->tagged->oid, commit)) < 0)
 512                 strbuf_addf(&verify_message, "tag %s names a non-parent %s\n",
 513                                     tag->tag, tag->tagged->oid.hash);
 514         else
 515                 strbuf_addf(&verify_message,
 516                             "parent #%d, tagged '%s'\n", nth + 1, tag->tag);
 517         gpg_message_offset = verify_message.len;
 518
 519         payload_size = parse_signature(extra->value, extra->len);
 520         status = -1;
 521         if (extra->len > payload_size) {
 522                 /* could have a good signature */
 523                 if (!verify_signed_buffer(extra->value, payload_size,
 524                                           extra->value + payload_size,
 525                                           extra->len - payload_size,
 526                                           &verify_message, NULL))
 527                         status = 0; /* good */
 528                 else if (verify_message.len <= gpg_message_offset)
 529                         strbuf_addstr(&verify_message, "No signature\n");
 530                 /* otherwise we couldn't verify, which is shown as bad */
 531         }
 532
 533         show_sig_lines(opt, status, verify_message.buf);
 534         strbuf_release(&verify_message);
 535         return 0;
 536 }
 537
 538 static int show_mergetag(struct rev_info *opt, struct commit *commit)
 539 {
 540         return for_each_mergetag(show_one_mergetag, commit, opt);
 541 }
 542
 543 void show_log(struct rev_info *opt)
 544 {
 545         struct strbuf msgbuf = STRBUF_INIT;
 546         struct log_info *log = opt->loginfo;
 547         struct commit *commit = log->commit, *parent = log->parent;
 548         int abbrev_commit = opt->abbrev_commit ? opt->abbrev : GIT_SHA1_HEXSZ;
 549         const char *extra_headers = opt->extra_headers;
 550         struct pretty_print_context ctx = {0};
 551
 552         opt->loginfo = NULL;
 553         if (!opt->verbose_header) {
 554                 graph_show_commit(opt->graph);
 555
 556                 if (!opt->graph)
 557                         put_revision_mark(opt, commit);
 558                 fputs(find_unique_abbrev(&commit->object.oid, abbrev_commit), opt->diffopt.file);
 559                 if (opt->print_parents)
 560                         show_parents(commit, abbrev_commit, opt->diffopt.file);
 561                 if (opt->children.name)
 562                         show_children(opt, commit, abbrev_commit);
 563                 show_decorations(opt, commit);
 564                 if (opt->graph && !graph_is_commit_finished(opt->graph)) {
 565                         putc('\n', opt->diffopt.file);
 566                         graph_show_remainder(opt->graph);
 567                 }
 568                 putc(opt->diffopt.line_termination, opt->diffopt.file);
 569                 return;
 570         }
 571
 572         /*
 573          * If use_terminator is set, we already handled any record termination
 574          * at the end of the last record.
 575          * Otherwise, add a diffopt.line_termination character before all
 576          * entries but the first.  (IOW, as a separator between entries)
 577          */
 578         if (opt->shown_one && !opt->use_terminator) {
 579                 /*
 580                  * If entries are separated by a newline, the output
 581                  * should look human-readable.  If the last entry ended
 582                  * with a newline, print the graph output before this
 583                  * newline.  Otherwise it will end up as a completely blank
 584                  * line and will look like a gap in the graph.
 585                  *
 586                  * If the entry separator is not a newline, the output is
 587                  * primarily intended for programmatic consumption, and we
 588                  * never want the extra graph output before the entry
 589                  * separator.
 590                  */
 591                 if (opt->diffopt.line_termination == '\n' &&
 592                     !opt->missing_newline)
 593                         graph_show_padding(opt->graph);
 594                 putc(opt->diffopt.line_termination, opt->diffopt.file);
 595         }
 596         opt->shown_one = 1;
 597
 598         /*
 599          * If the history graph was requested,
 600          * print the graph, up to this commit's line
 601          */
 602         graph_show_commit(opt->graph);
 603
 604         /*
 605          * Print header line of header..
 606          */
 607
 608         if (cmit_fmt_is_mail(opt->commit_format)) {
 609                 log_write_email_headers(opt, commit, &extra_headers,
 610                                         &ctx.need_8bit_cte, 1);
 611                 ctx.rev = opt;
 612                 ctx.print_email_subject = 1;
 613         } else if (opt->commit_format != CMIT_FMT_USERFORMAT) {
 614                 fputs(diff_get_color_opt(&opt->diffopt, DIFF_COMMIT), opt->diffopt.file);
 615                 if (opt->commit_format != CMIT_FMT_ONELINE)
 616                         fputs("commit ", opt->diffopt.file);
 617
 618                 if (!opt->graph)
 619                         put_revision_mark(opt, commit);
 620                 fputs(find_unique_abbrev(&commit->object.oid,
 621                                          abbrev_commit),
 622                       opt->diffopt.file);
 623                 if (opt->print_parents)
 624                         show_parents(commit, abbrev_commit, opt->diffopt.file);
 625                 if (opt->children.name)
 626                         show_children(opt, commit, abbrev_commit);
 627                 if (parent)
 628                         fprintf(opt->diffopt.file, " (from %s)",
 629                                find_unique_abbrev(&parent->object.oid, abbrev_commit));
 630                 fputs(diff_get_color_opt(&opt->diffopt, DIFF_RESET), opt->diffopt.file);
 631                 show_decorations(opt, commit);
 632                 if (opt->commit_format == CMIT_FMT_ONELINE) {
 633                         putc(' ', opt->diffopt.file);
 634                 } else {
 635                         putc('\n', opt->diffopt.file);
 636                         graph_show_oneline(opt->graph);
 637                 }
 638                 if (opt->reflog_info) {
 639                         /*
 640                          * setup_revisions() ensures that opt->reflog_info
 641                          * and opt->graph cannot both be set,
 642                          * so we don't need to worry about printing the
 643                          * graph info here.
 644                          */
 645                         show_reflog_message(opt->reflog_info,
 646                                             opt->commit_format == CMIT_FMT_ONELINE,
 647                                             &opt->date_mode,
 648                                             opt->date_mode_explicit);
 649                         if (opt->commit_format == CMIT_FMT_ONELINE)
 650                                 return;
 651                 }
 652         }
 653
 654         if (opt->show_signature) {
 655                 show_signature(opt, commit);
 656                 show_mergetag(opt, commit);
 657         }
 658
 659         if (opt->show_notes) {
 660                 int raw;
 661                 struct strbuf notebuf = STRBUF_INIT;
 662
 663                 raw = (opt->commit_format == CMIT_FMT_USERFORMAT);
 664                 format_display_notes(&commit->object.oid, &notebuf,
 665                                      get_log_output_encoding(), raw);
 666                 ctx.notes_message = notebuf.len
 667                         ? strbuf_detach(&notebuf, NULL)
 668                         : xcalloc(1, 1);
 669         }
 670
 671         /*
 672          * And then the pretty-printed message itself
 673          */
 674         if (ctx.need_8bit_cte >= 0 && opt->add_signoff)
 675                 ctx.need_8bit_cte =
 676                         has_non_ascii(fmt_name(getenv("GIT_COMMITTER_NAME"),
 677                                                getenv("GIT_COMMITTER_EMAIL")));
 678         ctx.date_mode = opt->date_mode;
 679         ctx.date_mode_explicit = opt->date_mode_explicit;
 680         ctx.abbrev = opt->diffopt.abbrev;
 681         ctx.after_subject = extra_headers;
 682         ctx.preserve_subject = opt->preserve_subject;
 683         ctx.reflog_info = opt->reflog_info;
 684         ctx.fmt = opt->commit_format;
 685         ctx.mailmap = opt->mailmap;
 686         ctx.color = opt->diffopt.use_color;
 687         ctx.expand_tabs_in_log = opt->expand_tabs_in_log;
 688         ctx.output_encoding = get_log_output_encoding();
 689         if (opt->from_ident.mail_begin && opt->from_ident.name_begin)
 690                 ctx.from_ident = &opt->from_ident;
 691         if (opt->graph)
 692                 ctx.graph_width = graph_width(opt->graph);
 693         pretty_print_commit(&ctx, commit, &msgbuf);
 694
 695         if (opt->add_signoff)
 696                 append_signoff(&msgbuf, 0, APPEND_SIGNOFF_DEDUP);
 697
 698         if ((ctx.fmt != CMIT_FMT_USERFORMAT) &&
 699             ctx.notes_message && *ctx.notes_message) {
 700                 if (cmit_fmt_is_mail(ctx.fmt)) {
 701                         strbuf_addstr(&msgbuf, "---\n");
 702                         opt->shown_dashes = 1;
 703                 }
 704                 strbuf_addstr(&msgbuf, ctx.notes_message);
 705         }
 706
 707         if (opt->show_log_size) {
 708                 fprintf(opt->diffopt.file, "log size %i\n", (int)msgbuf.len);
 709                 graph_show_oneline(opt->graph);
 710         }
 711
 712         /*
 713          * Set opt->missing_newline if msgbuf doesn't
 714          * end in a newline (including if it is empty)
 715          */
 716         if (!msgbuf.len || msgbuf.buf[msgbuf.len - 1] != '\n')
 717                 opt->missing_newline = 1;
 718         else
 719                 opt->missing_newline = 0;
 720
 721         graph_show_commit_msg(opt->graph, opt->diffopt.file, &msgbuf);
 722         if (opt->use_terminator && !commit_format_is_empty(opt->commit_format)) {
 723                 if (!opt->missing_newline)
 724                         graph_show_padding(opt->graph);
 725                 putc(opt->diffopt.line_termination, opt->diffopt.file);
 726         }
 727
 728         strbuf_release(&msgbuf);
 729         free(ctx.notes_message);
 730 }
 731
 732 int log_tree_diff_flush(struct rev_info *opt)
 733 {
 734         opt->shown_dashes = 0;
 735         diffcore_std(&opt->diffopt);
 736
 737         if (diff_queue_is_empty()) {
 738                 int saved_fmt = opt->diffopt.output_format;
 739                 opt->diffopt.output_format = DIFF_FORMAT_NO_OUTPUT;
 740                 diff_flush(&opt->diffopt);
 741                 opt->diffopt.output_format = saved_fmt;
 742                 return 0;
 743         }
 744
 745         if (opt->loginfo && !opt->no_commit_id) {
 746                 show_log(opt);
 747                 if ((opt->diffopt.output_format & ~DIFF_FORMAT_NO_OUTPUT) &&
 748                     opt->verbose_header &&
 749                     opt->commit_format != CMIT_FMT_ONELINE &&
 750                     !commit_format_is_empty(opt->commit_format)) {
 751                         /*
 752                          * When showing a verbose header (i.e. log message),
 753                          * and not in --pretty=oneline format, we would want
 754                          * an extra newline between the end of log and the
 755                          * diff/diffstat output for readability.
 756                          */
 757                         int pch = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_PATCH;
 758                         if (opt->diffopt.output_prefix) {
 759                                 struct strbuf *msg = NULL;
 760                                 msg = opt->diffopt.output_prefix(&opt->diffopt,
 761                                         opt->diffopt.output_prefix_data);
 762                                 fwrite(msg->buf, msg->len, 1, opt->diffopt.file);
 763                         }
 764
 765                         /*
 766                          * We may have shown three-dashes line early
 767                          * between notes and the log message, in which
 768                          * case we only want a blank line after the
 769                          * notes without (an extra) three-dashes line.
 770                          * Otherwise, we show the three-dashes line if
 771                          * we are showing the patch with diffstat, but
 772                          * in that case, there is no extra blank line
 773                          * after the three-dashes line.
 774                          */
 775                         if (!opt->shown_dashes &&
 776                             (pch & opt->diffopt.output_format) == pch)
 777                                 fprintf(opt->diffopt.file, "---");
 778                         putc('\n', opt->diffopt.file);
 779                 }
 780         }
 781         diff_flush(&opt->diffopt);
 782         return 1;
 783 }
 784
 785 static int do_diff_combined(struct rev_info *opt, struct commit *commit)
 786 {
 787         diff_tree_combined_merge(commit, opt->dense_combined_merges, opt);
 788         return !opt->loginfo;
 789 }
 790
 791 /*
 792  * Show the diff of a commit.
 793  *
 794  * Return true if we printed any log info messages
 795  */
 796 static int log_tree_diff(struct rev_info *opt, struct commit *commit, struct log_info *log)
 797 {
 798         int showed_log;
 799         struct commit_list *parents;
 800         struct object_id *oid;
 801
 802         if (!opt->diff && !opt->diffopt.flags.exit_with_status)
 803                 return 0;
 804
 805         parse_commit_or_die(commit);
 806         oid = get_commit_tree_oid(commit);
 807
 808         /* Root commit? */
 809         parents = get_saved_parents(opt, commit);
 810         if (!parents) {
 811                 if (opt->show_root_diff) {
 812                         diff_root_tree_oid(oid, "", &opt->diffopt);
 813                         log_tree_diff_flush(opt);
 814                 }
 815                 return !opt->loginfo;
 816         }
 817
 818         /* More than one parent? */
 819         if (parents && parents->next) {
 820                 if (opt->ignore_merges)
 821                         return 0;
 822                 else if (opt->combine_merges)
 823                         return do_diff_combined(opt, commit);
 824                 else if (opt->first_parent_only) {
 825                         /*
 826                          * Generate merge log entry only for the first
 827                          * parent, showing summary diff of the others
 828                          * we merged _in_.
 829                          */
 830                         parse_commit_or_die(parents->item);
 831                         diff_tree_oid(get_commit_tree_oid(parents->item),
 832                                       oid, "", &opt->diffopt);
 833                         log_tree_diff_flush(opt);
 834                         return !opt->loginfo;
 835                 }
 836
 837                 /* If we show individual diffs, show the parent info */
 838                 log->parent = parents->item;
 839         }
 840
 841         showed_log = 0;
 842         for (;;) {
 843                 struct commit *parent = parents->item;
 844
 845                 parse_commit_or_die(parent);
 846                 diff_tree_oid(get_commit_tree_oid(parent),
 847                               oid, "", &opt->diffopt);
 848                 log_tree_diff_flush(opt);
 849
 850                 showed_log |= !opt->loginfo;
 851
 852                 /* Set up the log info for the next parent, if any.. */
 853                 parents = parents->next;
 854                 if (!parents)
 855                         break;
 856                 log->parent = parents->item;
 857                 opt->loginfo = log;
 858         }
 859         return showed_log;
 860 }
 861
 862 int log_tree_commit(struct rev_info *opt, struct commit *commit)
 863 {
 864         struct log_info log;
 865         int shown, close_file = opt->diffopt.close_file;
 866
 867         log.commit = commit;
 868         log.parent = NULL;
 869         opt->loginfo = &log;
 870         opt->diffopt.close_file = 0;
 871
 872         if (opt->line_level_traverse)
 873                 return line_log_print(opt, commit);
 874
 875         if (opt->track_linear && !opt->linear && !opt->reverse_output_stage)
 876                 fprintf(opt->diffopt.file, "\n%s\n", opt->break_bar);
 877         shown = log_tree_diff(opt, commit, &log);
 878         if (!shown && opt->loginfo && opt->always_show_header) {
 879                 log.parent = NULL;
 880                 show_log(opt);
 881                 shown = 1;
 882         }
 883         if (opt->track_linear && !opt->linear && opt->reverse_output_stage)
 884                 fprintf(opt->diffopt.file, "\n%s\n", opt->break_bar);
 885         opt->loginfo = NULL;
 886         maybe_flush_or_die(opt->diffopt.file, "stdout");
 887         if (close_file)
 888                 fclose(opt->diffopt.file);
 889         return shown;
 890 }