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 };
  38
  39 static const char *decorate_get_color(int decorate_use_color, enum decoration_type ix)
  40 {
  41         if (want_color(decorate_use_color))
  42                 return decoration_colors[ix];
  43         return "";
  44 }
  45
  46 define_list_config_array(color_decorate_slots);
  47
  48 int parse_decorate_color_config(const char *var, const char *slot_name, const char *value)
  49 {
  50         int slot = LOOKUP_CONFIG(color_decorate_slots, slot_name);
  51         if (slot < 0)
  52                 return 0;
  53         if (!value)
  54                 return config_error_nonbool(var);
  55         return color_parse(value, decoration_colors[slot]);
  56 }
  57
  58 /*
  59  * log-tree.c uses DIFF_OPT_TST for determining whether to use color
  60  * for showing the commit sha1, use the same check for --decorate
  61  */
  62 #define decorate_get_color_opt(o, ix) \
  63         decorate_get_color((o)->use_color, ix)
  64
  65 void add_name_decoration(enum decoration_type type, const char *name, struct object *obj)
  66 {
  67         struct name_decoration *res;
  68         FLEX_ALLOC_STR(res, name, name);
  69         res->type = type;
  70         res->next = add_decoration(&name_decoration, obj, res);
  71 }
  72
  73 const struct name_decoration *get_name_decoration(const struct object *obj)
  74 {
  75         return lookup_decoration(&name_decoration, obj);
  76 }
  77
  78 static int add_ref_decoration(const char *refname, const struct object_id *oid,
  79                               int flags, void *cb_data)
  80 {
  81         struct object *obj;
  82         enum decoration_type type = DECORATION_NONE;
  83         struct decoration_filter *filter = (struct decoration_filter *)cb_data;
  84
  85         if (filter && !ref_filter_match(refname,
  86                               filter->include_ref_pattern,
  87                               filter->exclude_ref_pattern))
  88                 return 0;
  89
  90         if (starts_with(refname, git_replace_ref_base)) {
  91                 struct object_id original_oid;
  92                 if (!check_replace_refs)
  93                         return 0;
  94                 if (get_oid_hex(refname + strlen(git_replace_ref_base),
  95                                 &original_oid)) {
  96                         warning("invalid replace ref %s", refname);
  97                         return 0;
  98                 }
  99                 obj = parse_object(&original_oid);
 100                 if (obj)
 101                         add_name_decoration(DECORATION_GRAFTED, "replaced", obj);
 102                 return 0;
 103         }
 104
 105         obj = parse_object(oid);
 106         if (!obj)
 107                 return 0;
 108
 109         if (starts_with(refname, "refs/heads/"))
 110                 type = DECORATION_REF_LOCAL;
 111         else if (starts_with(refname, "refs/remotes/"))
 112                 type = DECORATION_REF_REMOTE;
 113         else if (starts_with(refname, "refs/tags/"))
 114                 type = DECORATION_REF_TAG;
 115         else if (!strcmp(refname, "refs/stash"))
 116                 type = DECORATION_REF_STASH;
 117         else if (!strcmp(refname, "HEAD"))
 118                 type = DECORATION_REF_HEAD;
 119
 120         add_name_decoration(type, refname, obj);
 121         while (obj->type == OBJ_TAG) {
 122                 obj = ((struct tag *)obj)->tagged;
 123                 if (!obj)
 124                         break;
 125                 if (!obj->parsed)
 126                         parse_object(&obj->oid);
 127                 add_name_decoration(DECORATION_REF_TAG, refname, obj);
 128         }
 129         return 0;
 130 }
 131
 132 static int add_graft_decoration(const struct commit_graft *graft, void *cb_data)
 133 {
 134         struct commit *commit = lookup_commit(&graft->oid);
 135         if (!commit)
 136                 return 0;
 137         add_name_decoration(DECORATION_GRAFTED, "grafted", &commit->object);
 138         return 0;
 139 }
 140
 141 void load_ref_decorations(struct decoration_filter *filter, int flags)
 142 {
 143         if (!decoration_loaded) {
 144                 if (filter) {
 145                         struct string_list_item *item;
 146                         for_each_string_list_item(item, filter->exclude_ref_pattern) {
 147                                 normalize_glob_ref(item, NULL, item->string);
 148                         }
 149                         for_each_string_list_item(item, filter->include_ref_pattern) {
 150                                 normalize_glob_ref(item, NULL, item->string);
 151                         }
 152                 }
 153                 decoration_loaded = 1;
 154                 decoration_flags = flags;
 155                 for_each_ref(add_ref_decoration, filter);
 156                 head_ref(add_ref_decoration, filter);
 157                 for_each_commit_graft(add_graft_decoration, filter);
 158         }
 159 }
 160
 161 static void show_parents(struct commit *commit, int abbrev, FILE *file)
 162 {
 163         struct commit_list *p;
 164         for (p = commit->parents; p ; p = p->next) {
 165                 struct commit *parent = p->item;
 166                 fprintf(file, " %s", find_unique_abbrev(&parent->object.oid, abbrev));
 167         }
 168 }
 169
 170 static void show_children(struct rev_info *opt, struct commit *commit, int abbrev)
 171 {
 172         struct commit_list *p = lookup_decoration(&opt->children, &commit->object);
 173         for ( ; p; p = p->next) {
 174                 fprintf(opt->diffopt.file, " %s", find_unique_abbrev(&p->item->object.oid, abbrev));
 175         }
 176 }
 177
 178 /*
 179  * Do we have HEAD in the output, and also the branch it points at?
 180  * If so, find that decoration entry for that current branch.
 181  */
 182 static const struct name_decoration *current_pointed_by_HEAD(const struct name_decoration *decoration)
 183 {
 184         const struct name_decoration *list, *head = NULL;
 185         const char *branch_name = NULL;
 186         int rru_flags;
 187
 188         /* First find HEAD */
 189         for (list = decoration; list; list = list->next)
 190                 if (list->type == DECORATION_REF_HEAD) {
 191                         head = list;
 192                         break;
 193                 }
 194         if (!head)
 195                 return NULL;
 196
 197         /* Now resolve and find the matching current branch */
 198         branch_name = resolve_ref_unsafe("HEAD", 0, NULL, &rru_flags);
 199         if (!branch_name || !(rru_flags & REF_ISSYMREF))
 200                 return NULL;
 201
 202         if (!starts_with(branch_name, "refs/"))
 203                 return NULL;
 204
 205         /* OK, do we have that ref in the list? */
 206         for (list = decoration; list; list = list->next)
 207                 if ((list->type == DECORATION_REF_LOCAL) &&
 208                     !strcmp(branch_name, list->name)) {
 209                         return list;
 210                 }
 211
 212         return NULL;
 213 }
 214
 215 static void show_name(struct strbuf *sb, const struct name_decoration *decoration)
 216 {
 217         if (decoration_flags == DECORATE_SHORT_REFS)
 218                 strbuf_addstr(sb, prettify_refname(decoration->name));
 219         else
 220                 strbuf_addstr(sb, decoration->name);
 221 }
 222
 223 /*
 224  * The caller makes sure there is no funny color before calling.
 225  * format_decorations_extended makes sure the same after return.
 226  */
 227 void format_decorations_extended(struct strbuf *sb,
 228                         const struct commit *commit,
 229                         int use_color,
 230                         const char *prefix,
 231                         const char *separator,
 232                         const char *suffix)
 233 {
 234         const struct name_decoration *decoration;
 235         const struct name_decoration *current_and_HEAD;
 236         const char *color_commit =
 237                 diff_get_color(use_color, DIFF_COMMIT);
 238         const char *color_reset =
 239                 decorate_get_color(use_color, DECORATION_NONE);
 240
 241         decoration = get_name_decoration(&commit->object);
 242         if (!decoration)
 243                 return;
 244
 245         current_and_HEAD = current_pointed_by_HEAD(decoration);
 246         while (decoration) {
 247                 /*
 248                  * When both current and HEAD are there, only
 249                  * show HEAD->current where HEAD would have
 250                  * appeared, skipping the entry for current.
 251                  */
 252                 if (decoration != current_and_HEAD) {
 253                         strbuf_addstr(sb, color_commit);
 254                         strbuf_addstr(sb, prefix);
 255                         strbuf_addstr(sb, color_reset);
 256                         strbuf_addstr(sb, decorate_get_color(use_color, decoration->type));
 257                         if (decoration->type == DECORATION_REF_TAG)
 258                                 strbuf_addstr(sb, "tag: ");
 259
 260                         show_name(sb, decoration);
 261
 262                         if (current_and_HEAD &&
 263                             decoration->type == DECORATION_REF_HEAD) {
 264                                 strbuf_addstr(sb, " -> ");
 265                                 strbuf_addstr(sb, color_reset);
 266                                 strbuf_addstr(sb, decorate_get_color(use_color, current_and_HEAD->type));
 267                                 show_name(sb, current_and_HEAD);
 268                         }
 269                         strbuf_addstr(sb, color_reset);
 270
 271                         prefix = separator;
 272                 }
 273                 decoration = decoration->next;
 274         }
 275         strbuf_addstr(sb, color_commit);
 276         strbuf_addstr(sb, suffix);
 277         strbuf_addstr(sb, color_reset);
 278 }
 279
 280 void show_decorations(struct rev_info *opt, struct commit *commit)
 281 {
 282         struct strbuf sb = STRBUF_INIT;
 283
 284         if (opt->show_source && commit->util)
 285                 fprintf(opt->diffopt.file, "\t%s", (char *) commit->util);
 286         if (!opt->show_decorations)
 287                 return;
 288         format_decorations(&sb, commit, opt->diffopt.use_color);
 289         fputs(sb.buf, opt->diffopt.file);
 290         strbuf_release(&sb);
 291 }
 292
 293 static unsigned int digits_in_number(unsigned int number)
 294 {
 295         unsigned int i = 10, result = 1;
 296         while (i <= number) {
 297                 i *= 10;
 298                 result++;
 299         }
 300         return result;
 301 }
 302
 303 void fmt_output_subject(struct strbuf *filename,
 304                         const char *subject,
 305                         struct rev_info *info)
 306 {
 307         const char *suffix = info->patch_suffix;
 308         int nr = info->nr;
 309         int start_len = filename->len;
 310         int max_len = start_len + FORMAT_PATCH_NAME_MAX - (strlen(suffix) + 1);
 311
 312         if (0 < info->reroll_count)
 313                 strbuf_addf(filename, "v%d-", info->reroll_count);
 314         strbuf_addf(filename, "%04d-%s", nr, subject);
 315
 316         if (max_len < filename->len)
 317                 strbuf_setlen(filename, max_len);
 318         strbuf_addstr(filename, suffix);
 319 }
 320
 321 void fmt_output_commit(struct strbuf *filename,
 322                        struct commit *commit,
 323                        struct rev_info *info)
 324 {
 325         struct pretty_print_context ctx = {0};
 326         struct strbuf subject = STRBUF_INIT;
 327
 328         format_commit_message(commit, "%f", &subject, &ctx);
 329         fmt_output_subject(filename, subject.buf, info);
 330         strbuf_release(&subject);
 331 }
 332
 333 void fmt_output_email_subject(struct strbuf *sb, struct rev_info *opt)
 334 {
 335         if (opt->total > 0) {
 336                 strbuf_addf(sb, "Subject: [%s%s%0*d/%d] ",
 337                             opt->subject_prefix,
 338                             *opt->subject_prefix ? " " : "",
 339                             digits_in_number(opt->total),
 340                             opt->nr, opt->total);
 341         } else if (opt->total == 0 && opt->subject_prefix && *opt->subject_prefix) {
 342                 strbuf_addf(sb, "Subject: [%s] ",
 343                             opt->subject_prefix);
 344         } else {
 345                 strbuf_addstr(sb, "Subject: ");
 346         }
 347 }
 348
 349 void log_write_email_headers(struct rev_info *opt, struct commit *commit,
 350                              const char **extra_headers_p,
 351                              int *need_8bit_cte_p,
 352                              int maybe_multipart)
 353 {
 354         const char *extra_headers = opt->extra_headers;
 355         const char *name = oid_to_hex(opt->zero_commit ?
 356                                       &null_oid : &commit->object.oid);
 357
 358         *need_8bit_cte_p = 0; /* unknown */
 359
 360         fprintf(opt->diffopt.file, "From %s Mon Sep 17 00:00:00 2001\n", name);
 361         graph_show_oneline(opt->graph);
 362         if (opt->message_id) {
 363                 fprintf(opt->diffopt.file, "Message-Id: <%s>\n", opt->message_id);
 364                 graph_show_oneline(opt->graph);
 365         }
 366         if (opt->ref_message_ids && opt->ref_message_ids->nr > 0) {
 367                 int i, n;
 368                 n = opt->ref_message_ids->nr;
 369                 fprintf(opt->diffopt.file, "In-Reply-To: <%s>\n", opt->ref_message_ids->items[n-1].string);
 370                 for (i = 0; i < n; i++)
 371                         fprintf(opt->diffopt.file, "%s<%s>\n", (i > 0 ? "\t" : "References: "),
 372                                opt->ref_message_ids->items[i].string);
 373                 graph_show_oneline(opt->graph);
 374         }
 375         if (opt->mime_boundary && maybe_multipart) {
 376                 static char subject_buffer[1024];
 377                 static char buffer[1024];
 378                 struct strbuf filename =  STRBUF_INIT;
 379                 *need_8bit_cte_p = -1; /* NEVER */
 380                 snprintf(subject_buffer, sizeof(subject_buffer) - 1,
 381                          "%s"
 382                          "MIME-Version: 1.0\n"
 383                          "Content-Type: multipart/mixed;"
 384                          " boundary=\"%s%s\"\n"
 385                          "\n"
 386                          "This is a multi-part message in MIME "
 387                          "format.\n"
 388                          "--%s%s\n"
 389                          "Content-Type: text/plain; "
 390                          "charset=UTF-8; format=fixed\n"
 391                          "Content-Transfer-Encoding: 8bit\n\n",
 392                          extra_headers ? extra_headers : "",
 393                          mime_boundary_leader, opt->mime_boundary,
 394                          mime_boundary_leader, opt->mime_boundary);
 395                 extra_headers = subject_buffer;
 396
 397                 if (opt->numbered_files)
 398                         strbuf_addf(&filename, "%d", opt->nr);
 399                 else
 400                         fmt_output_commit(&filename, commit, opt);
 401                 snprintf(buffer, sizeof(buffer) - 1,
 402                          "\n--%s%s\n"
 403                          "Content-Type: text/x-patch;"
 404                          " name=\"%s\"\n"
 405                          "Content-Transfer-Encoding: 8bit\n"
 406                          "Content-Disposition: %s;"
 407                          " filename=\"%s\"\n\n",
 408                          mime_boundary_leader, opt->mime_boundary,
 409                          filename.buf,
 410                          opt->no_inline ? "attachment" : "inline",
 411                          filename.buf);
 412                 opt->diffopt.stat_sep = buffer;
 413                 strbuf_release(&filename);
 414         }
 415         *extra_headers_p = extra_headers;
 416 }
 417
 418 static void show_sig_lines(struct rev_info *opt, int status, const char *bol)
 419 {
 420         const char *color, *reset, *eol;
 421
 422         color = diff_get_color_opt(&opt->diffopt,
 423                                    status ? DIFF_WHITESPACE : DIFF_FRAGINFO);
 424         reset = diff_get_color_opt(&opt->diffopt, DIFF_RESET);
 425         while (*bol) {
 426                 eol = strchrnul(bol, '\n');
 427                 fprintf(opt->diffopt.file, "%s%.*s%s%s", color, (int)(eol - bol), bol, reset,
 428                        *eol ? "\n" : "");
 429                 graph_show_oneline(opt->graph);
 430                 bol = (*eol) ? (eol + 1) : eol;
 431         }
 432 }
 433
 434 static void show_signature(struct rev_info *opt, struct commit *commit)
 435 {
 436         struct strbuf payload = STRBUF_INIT;
 437         struct strbuf signature = STRBUF_INIT;
 438         struct strbuf gpg_output = STRBUF_INIT;
 439         int status;
 440
 441         if (parse_signed_commit(commit, &payload, &signature) <= 0)
 442                 goto out;
 443
 444         status = verify_signed_buffer(payload.buf, payload.len,
 445                                       signature.buf, signature.len,
 446                                       &gpg_output, NULL);
 447         if (status && !gpg_output.len)
 448                 strbuf_addstr(&gpg_output, "No signature\n");
 449
 450         show_sig_lines(opt, status, gpg_output.buf);
 451
 452  out:
 453         strbuf_release(&gpg_output);
 454         strbuf_release(&payload);
 455         strbuf_release(&signature);
 456 }
 457
 458 static int which_parent(const struct object_id *oid, const struct commit *commit)
 459 {
 460         int nth;
 461         const struct commit_list *parent;
 462
 463         for (nth = 0, parent = commit->parents; parent; parent = parent->next) {
 464                 if (!oidcmp(&parent->item->object.oid, oid))
 465                         return nth;
 466                 nth++;
 467         }
 468         return -1;
 469 }
 470
 471 static int is_common_merge(const struct commit *commit)
 472 {
 473         return (commit->parents
 474                 && commit->parents->next
 475                 && !commit->parents->next->next);
 476 }
 477
 478 static int show_one_mergetag(struct commit *commit,
 479                              struct commit_extra_header *extra,
 480                              void *data)
 481 {
 482         struct rev_info *opt = (struct rev_info *)data;
 483         struct object_id oid;
 484         struct tag *tag;
 485         struct strbuf verify_message;
 486         int status, nth;
 487         size_t payload_size, gpg_message_offset;
 488
 489         hash_object_file(extra->value, extra->len, type_name(OBJ_TAG), &oid);
 490         tag = lookup_tag(&oid);
 491         if (!tag)
 492                 return -1; /* error message already given */
 493
 494         strbuf_init(&verify_message, 256);
 495         if (parse_tag_buffer(tag, extra->value, extra->len))
 496                 strbuf_addstr(&verify_message, "malformed mergetag\n");
 497         else if (is_common_merge(commit) &&
 498                  !oidcmp(&tag->tagged->oid,
 499                           &commit->parents->next->item->object.oid))
 500                 strbuf_addf(&verify_message,
 501                             "merged tag '%s'\n", tag->tag);
 502         else if ((nth = which_parent(&tag->tagged->oid, commit)) < 0)
 503                 strbuf_addf(&verify_message, "tag %s names a non-parent %s\n",
 504                                     tag->tag, tag->tagged->oid.hash);
 505         else
 506                 strbuf_addf(&verify_message,
 507                             "parent #%d, tagged '%s'\n", nth + 1, tag->tag);
 508         gpg_message_offset = verify_message.len;
 509
 510         payload_size = parse_signature(extra->value, extra->len);
 511         status = -1;
 512         if (extra->len > payload_size) {
 513                 /* could have a good signature */
 514                 if (!verify_signed_buffer(extra->value, payload_size,
 515                                           extra->value + payload_size,
 516                                           extra->len - payload_size,
 517                                           &verify_message, NULL))
 518                         status = 0; /* good */
 519                 else if (verify_message.len <= gpg_message_offset)
 520                         strbuf_addstr(&verify_message, "No signature\n");
 521                 /* otherwise we couldn't verify, which is shown as bad */
 522         }
 523
 524         show_sig_lines(opt, status, verify_message.buf);
 525         strbuf_release(&verify_message);
 526         return 0;
 527 }
 528
 529 static int show_mergetag(struct rev_info *opt, struct commit *commit)
 530 {
 531         return for_each_mergetag(show_one_mergetag, commit, opt);
 532 }
 533
 534 void show_log(struct rev_info *opt)
 535 {
 536         struct strbuf msgbuf = STRBUF_INIT;
 537         struct log_info *log = opt->loginfo;
 538         struct commit *commit = log->commit, *parent = log->parent;
 539         int abbrev_commit = opt->abbrev_commit ? opt->abbrev : GIT_SHA1_HEXSZ;
 540         const char *extra_headers = opt->extra_headers;
 541         struct pretty_print_context ctx = {0};
 542
 543         opt->loginfo = NULL;
 544         if (!opt->verbose_header) {
 545                 graph_show_commit(opt->graph);
 546
 547                 if (!opt->graph)
 548                         put_revision_mark(opt, commit);
 549                 fputs(find_unique_abbrev(&commit->object.oid, abbrev_commit), opt->diffopt.file);
 550                 if (opt->print_parents)
 551                         show_parents(commit, abbrev_commit, opt->diffopt.file);
 552                 if (opt->children.name)
 553                         show_children(opt, commit, abbrev_commit);
 554                 show_decorations(opt, commit);
 555                 if (opt->graph && !graph_is_commit_finished(opt->graph)) {
 556                         putc('\n', opt->diffopt.file);
 557                         graph_show_remainder(opt->graph);
 558                 }
 559                 putc(opt->diffopt.line_termination, opt->diffopt.file);
 560                 return;
 561         }
 562
 563         /*
 564          * If use_terminator is set, we already handled any record termination
 565          * at the end of the last record.
 566          * Otherwise, add a diffopt.line_termination character before all
 567          * entries but the first.  (IOW, as a separator between entries)
 568          */
 569         if (opt->shown_one && !opt->use_terminator) {
 570                 /*
 571                  * If entries are separated by a newline, the output
 572                  * should look human-readable.  If the last entry ended
 573                  * with a newline, print the graph output before this
 574                  * newline.  Otherwise it will end up as a completely blank
 575                  * line and will look like a gap in the graph.
 576                  *
 577                  * If the entry separator is not a newline, the output is
 578                  * primarily intended for programmatic consumption, and we
 579                  * never want the extra graph output before the entry
 580                  * separator.
 581                  */
 582                 if (opt->diffopt.line_termination == '\n' &&
 583                     !opt->missing_newline)
 584                         graph_show_padding(opt->graph);
 585                 putc(opt->diffopt.line_termination, opt->diffopt.file);
 586         }
 587         opt->shown_one = 1;
 588
 589         /*
 590          * If the history graph was requested,
 591          * print the graph, up to this commit's line
 592          */
 593         graph_show_commit(opt->graph);
 594
 595         /*
 596          * Print header line of header..
 597          */
 598
 599         if (cmit_fmt_is_mail(opt->commit_format)) {
 600                 log_write_email_headers(opt, commit, &extra_headers,
 601                                         &ctx.need_8bit_cte, 1);
 602                 ctx.rev = opt;
 603                 ctx.print_email_subject = 1;
 604         } else if (opt->commit_format != CMIT_FMT_USERFORMAT) {
 605                 fputs(diff_get_color_opt(&opt->diffopt, DIFF_COMMIT), opt->diffopt.file);
 606                 if (opt->commit_format != CMIT_FMT_ONELINE)
 607                         fputs("commit ", opt->diffopt.file);
 608
 609                 if (!opt->graph)
 610                         put_revision_mark(opt, commit);
 611                 fputs(find_unique_abbrev(&commit->object.oid,
 612                                          abbrev_commit),
 613                       opt->diffopt.file);
 614                 if (opt->print_parents)
 615                         show_parents(commit, abbrev_commit, opt->diffopt.file);
 616                 if (opt->children.name)
 617                         show_children(opt, commit, abbrev_commit);
 618                 if (parent)
 619                         fprintf(opt->diffopt.file, " (from %s)",
 620                                find_unique_abbrev(&parent->object.oid, abbrev_commit));
 621                 fputs(diff_get_color_opt(&opt->diffopt, DIFF_RESET), opt->diffopt.file);
 622                 show_decorations(opt, commit);
 623                 if (opt->commit_format == CMIT_FMT_ONELINE) {
 624                         putc(' ', opt->diffopt.file);
 625                 } else {
 626                         putc('\n', opt->diffopt.file);
 627                         graph_show_oneline(opt->graph);
 628                 }
 629                 if (opt->reflog_info) {
 630                         /*
 631                          * setup_revisions() ensures that opt->reflog_info
 632                          * and opt->graph cannot both be set,
 633                          * so we don't need to worry about printing the
 634                          * graph info here.
 635                          */
 636                         show_reflog_message(opt->reflog_info,
 637                                             opt->commit_format == CMIT_FMT_ONELINE,
 638                                             &opt->date_mode,
 639                                             opt->date_mode_explicit);
 640                         if (opt->commit_format == CMIT_FMT_ONELINE)
 641                                 return;
 642                 }
 643         }
 644
 645         if (opt->show_signature) {
 646                 show_signature(opt, commit);
 647                 show_mergetag(opt, commit);
 648         }
 649
 650         if (opt->show_notes) {
 651                 int raw;
 652                 struct strbuf notebuf = STRBUF_INIT;
 653
 654                 raw = (opt->commit_format == CMIT_FMT_USERFORMAT);
 655                 format_display_notes(&commit->object.oid, &notebuf,
 656                                      get_log_output_encoding(), raw);
 657                 ctx.notes_message = notebuf.len
 658                         ? strbuf_detach(&notebuf, NULL)
 659                         : xcalloc(1, 1);
 660         }
 661
 662         /*
 663          * And then the pretty-printed message itself
 664          */
 665         if (ctx.need_8bit_cte >= 0 && opt->add_signoff)
 666                 ctx.need_8bit_cte =
 667                         has_non_ascii(fmt_name(getenv("GIT_COMMITTER_NAME"),
 668                                                getenv("GIT_COMMITTER_EMAIL")));
 669         ctx.date_mode = opt->date_mode;
 670         ctx.date_mode_explicit = opt->date_mode_explicit;
 671         ctx.abbrev = opt->diffopt.abbrev;
 672         ctx.after_subject = extra_headers;
 673         ctx.preserve_subject = opt->preserve_subject;
 674         ctx.reflog_info = opt->reflog_info;
 675         ctx.fmt = opt->commit_format;
 676         ctx.mailmap = opt->mailmap;
 677         ctx.color = opt->diffopt.use_color;
 678         ctx.expand_tabs_in_log = opt->expand_tabs_in_log;
 679         ctx.output_encoding = get_log_output_encoding();
 680         if (opt->from_ident.mail_begin && opt->from_ident.name_begin)
 681                 ctx.from_ident = &opt->from_ident;
 682         if (opt->graph)
 683                 ctx.graph_width = graph_width(opt->graph);
 684         pretty_print_commit(&ctx, commit, &msgbuf);
 685
 686         if (opt->add_signoff)
 687                 append_signoff(&msgbuf, 0, APPEND_SIGNOFF_DEDUP);
 688
 689         if ((ctx.fmt != CMIT_FMT_USERFORMAT) &&
 690             ctx.notes_message && *ctx.notes_message) {
 691                 if (cmit_fmt_is_mail(ctx.fmt)) {
 692                         strbuf_addstr(&msgbuf, "---\n");
 693                         opt->shown_dashes = 1;
 694                 }
 695                 strbuf_addstr(&msgbuf, ctx.notes_message);
 696         }
 697
 698         if (opt->show_log_size) {
 699                 fprintf(opt->diffopt.file, "log size %i\n", (int)msgbuf.len);
 700                 graph_show_oneline(opt->graph);
 701         }
 702
 703         /*
 704          * Set opt->missing_newline if msgbuf doesn't
 705          * end in a newline (including if it is empty)
 706          */
 707         if (!msgbuf.len || msgbuf.buf[msgbuf.len - 1] != '\n')
 708                 opt->missing_newline = 1;
 709         else
 710                 opt->missing_newline = 0;
 711
 712         graph_show_commit_msg(opt->graph, opt->diffopt.file, &msgbuf);
 713         if (opt->use_terminator && !commit_format_is_empty(opt->commit_format)) {
 714                 if (!opt->missing_newline)
 715                         graph_show_padding(opt->graph);
 716                 putc(opt->diffopt.line_termination, opt->diffopt.file);
 717         }
 718
 719         strbuf_release(&msgbuf);
 720         free(ctx.notes_message);
 721 }
 722
 723 int log_tree_diff_flush(struct rev_info *opt)
 724 {
 725         opt->shown_dashes = 0;
 726         diffcore_std(&opt->diffopt);
 727
 728         if (diff_queue_is_empty()) {
 729                 int saved_fmt = opt->diffopt.output_format;
 730                 opt->diffopt.output_format = DIFF_FORMAT_NO_OUTPUT;
 731                 diff_flush(&opt->diffopt);
 732                 opt->diffopt.output_format = saved_fmt;
 733                 return 0;
 734         }
 735
 736         if (opt->loginfo && !opt->no_commit_id) {
 737                 show_log(opt);
 738                 if ((opt->diffopt.output_format & ~DIFF_FORMAT_NO_OUTPUT) &&
 739                     opt->verbose_header &&
 740                     opt->commit_format != CMIT_FMT_ONELINE &&
 741                     !commit_format_is_empty(opt->commit_format)) {
 742                         /*
 743                          * When showing a verbose header (i.e. log message),
 744                          * and not in --pretty=oneline format, we would want
 745                          * an extra newline between the end of log and the
 746                          * diff/diffstat output for readability.
 747                          */
 748                         int pch = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_PATCH;
 749                         if (opt->diffopt.output_prefix) {
 750                                 struct strbuf *msg = NULL;
 751                                 msg = opt->diffopt.output_prefix(&opt->diffopt,
 752                                         opt->diffopt.output_prefix_data);
 753                                 fwrite(msg->buf, msg->len, 1, opt->diffopt.file);
 754                         }
 755
 756                         /*
 757                          * We may have shown three-dashes line early
 758                          * between notes and the log message, in which
 759                          * case we only want a blank line after the
 760                          * notes without (an extra) three-dashes line.
 761                          * Otherwise, we show the three-dashes line if
 762                          * we are showing the patch with diffstat, but
 763                          * in that case, there is no extra blank line
 764                          * after the three-dashes line.
 765                          */
 766                         if (!opt->shown_dashes &&
 767                             (pch & opt->diffopt.output_format) == pch)
 768                                 fprintf(opt->diffopt.file, "---");
 769                         putc('\n', opt->diffopt.file);
 770                 }
 771         }
 772         diff_flush(&opt->diffopt);
 773         return 1;
 774 }
 775
 776 static int do_diff_combined(struct rev_info *opt, struct commit *commit)
 777 {
 778         diff_tree_combined_merge(commit, opt->dense_combined_merges, opt);
 779         return !opt->loginfo;
 780 }
 781
 782 /*
 783  * Show the diff of a commit.
 784  *
 785  * Return true if we printed any log info messages
 786  */
 787 static int log_tree_diff(struct rev_info *opt, struct commit *commit, struct log_info *log)
 788 {
 789         int showed_log;
 790         struct commit_list *parents;
 791         struct object_id *oid;
 792
 793         if (!opt->diff && !opt->diffopt.flags.exit_with_status)
 794                 return 0;
 795
 796         parse_commit_or_die(commit);
 797         oid = get_commit_tree_oid(commit);
 798
 799         /* Root commit? */
 800         parents = get_saved_parents(opt, commit);
 801         if (!parents) {
 802                 if (opt->show_root_diff) {
 803                         diff_root_tree_oid(oid, "", &opt->diffopt);
 804                         log_tree_diff_flush(opt);
 805                 }
 806                 return !opt->loginfo;
 807         }
 808
 809         /* More than one parent? */
 810         if (parents && parents->next) {
 811                 if (opt->ignore_merges)
 812                         return 0;
 813                 else if (opt->combine_merges)
 814                         return do_diff_combined(opt, commit);
 815                 else if (opt->first_parent_only) {
 816                         /*
 817                          * Generate merge log entry only for the first
 818                          * parent, showing summary diff of the others
 819                          * we merged _in_.
 820                          */
 821                         parse_commit_or_die(parents->item);
 822                         diff_tree_oid(get_commit_tree_oid(parents->item),
 823                                       oid, "", &opt->diffopt);
 824                         log_tree_diff_flush(opt);
 825                         return !opt->loginfo;
 826                 }
 827
 828                 /* If we show individual diffs, show the parent info */
 829                 log->parent = parents->item;
 830         }
 831
 832         showed_log = 0;
 833         for (;;) {
 834                 struct commit *parent = parents->item;
 835
 836                 parse_commit_or_die(parent);
 837                 diff_tree_oid(get_commit_tree_oid(parent),
 838                               oid, "", &opt->diffopt);
 839                 log_tree_diff_flush(opt);
 840
 841                 showed_log |= !opt->loginfo;
 842
 843                 /* Set up the log info for the next parent, if any.. */
 844                 parents = parents->next;
 845                 if (!parents)
 846                         break;
 847                 log->parent = parents->item;
 848                 opt->loginfo = log;
 849         }
 850         return showed_log;
 851 }
 852
 853 int log_tree_commit(struct rev_info *opt, struct commit *commit)
 854 {
 855         struct log_info log;
 856         int shown, close_file = opt->diffopt.close_file;
 857
 858         log.commit = commit;
 859         log.parent = NULL;
 860         opt->loginfo = &log;
 861         opt->diffopt.close_file = 0;
 862
 863         if (opt->line_level_traverse)
 864                 return line_log_print(opt, commit);
 865
 866         if (opt->track_linear && !opt->linear && !opt->reverse_output_stage)
 867                 fprintf(opt->diffopt.file, "\n%s\n", opt->break_bar);
 868         shown = log_tree_diff(opt, commit, &log);
 869         if (!shown && opt->loginfo && opt->always_show_header) {
 870                 log.parent = NULL;
 871                 show_log(opt);
 872                 shown = 1;
 873         }
 874         if (opt->track_linear && !opt->linear && opt->reverse_output_stage)
 875                 fprintf(opt->diffopt.file, "\n%s\n", opt->break_bar);
 876         opt->loginfo = NULL;
 877         maybe_flush_or_die(opt->diffopt.file, "stdout");
 878         if (close_file)
 879                 fclose(opt->diffopt.file);
 880         return shown;
 881 }