log-tree.c

   1 #include "cache.h"
   2 #include "diff.h"
   3 #include "commit.h"
   4 #include "tag.h"
   5 #include "graph.h"
   6 #include "log-tree.h"
   7 #include "reflog-walk.h"
   8 #include "refs.h"
   9 #include "string-list.h"
  10 #include "color.h"
  11
  12 struct decoration name_decoration = { "object names" };
  13
  14 enum decoration_type {
  15         DECORATION_NONE = 0,
  16         DECORATION_REF_LOCAL,
  17         DECORATION_REF_REMOTE,
  18         DECORATION_REF_TAG,
  19         DECORATION_REF_STASH,
  20         DECORATION_REF_HEAD,
  21         DECORATION_GRAFTED,
  22 };
  23
  24 static char decoration_colors[][COLOR_MAXLEN] = {
  25         GIT_COLOR_RESET,
  26         GIT_COLOR_BOLD_GREEN,   /* REF_LOCAL */
  27         GIT_COLOR_BOLD_RED,     /* REF_REMOTE */
  28         GIT_COLOR_BOLD_YELLOW,  /* REF_TAG */
  29         GIT_COLOR_BOLD_MAGENTA, /* REF_STASH */
  30         GIT_COLOR_BOLD_CYAN,    /* REF_HEAD */
  31         GIT_COLOR_BOLD_BLUE,    /* GRAFTED */
  32 };
  33
  34 static const char *decorate_get_color(int decorate_use_color, enum decoration_type ix)
  35 {
  36         if (want_color(decorate_use_color))
  37                 return decoration_colors[ix];
  38         return "";
  39 }
  40
  41 static int parse_decorate_color_slot(const char *slot)
  42 {
  43         /*
  44          * We're comparing with 'ignore-case' on
  45          * (because config.c sets them all tolower),
  46          * but let's match the letters in the literal
  47          * string values here with how they are
  48          * documented in Documentation/config.txt, for
  49          * consistency.
  50          *
  51          * We love being consistent, don't we?
  52          */
  53         if (!strcasecmp(slot, "branch"))
  54                 return DECORATION_REF_LOCAL;
  55         if (!strcasecmp(slot, "remoteBranch"))
  56                 return DECORATION_REF_REMOTE;
  57         if (!strcasecmp(slot, "tag"))
  58                 return DECORATION_REF_TAG;
  59         if (!strcasecmp(slot, "stash"))
  60                 return DECORATION_REF_STASH;
  61         if (!strcasecmp(slot, "HEAD"))
  62                 return DECORATION_REF_HEAD;
  63         return -1;
  64 }
  65
  66 int parse_decorate_color_config(const char *var, const int ofs, const char *value)
  67 {
  68         int slot = parse_decorate_color_slot(var + ofs);
  69         if (slot < 0)
  70                 return 0;
  71         if (!value)
  72                 return config_error_nonbool(var);
  73         color_parse(value, var, decoration_colors[slot]);
  74         return 0;
  75 }
  76
  77 /*
  78  * log-tree.c uses DIFF_OPT_TST for determining whether to use color
  79  * for showing the commit sha1, use the same check for --decorate
  80  */
  81 #define decorate_get_color_opt(o, ix) \
  82         decorate_get_color((o)->use_color, ix)
  83
  84 static void add_name_decoration(enum decoration_type type, const char *name, struct object *obj)
  85 {
  86         int nlen = strlen(name);
  87         struct name_decoration *res = xmalloc(sizeof(struct name_decoration) + nlen);
  88         memcpy(res->name, name, nlen + 1);
  89         res->type = type;
  90         res->next = add_decoration(&name_decoration, obj, res);
  91 }
  92
  93 static int add_ref_decoration(const char *refname, const unsigned char *sha1, int flags, void *cb_data)
  94 {
  95         struct object *obj;
  96         enum decoration_type type = DECORATION_NONE;
  97
  98         if (!prefixcmp(refname, "refs/replace/")) {
  99                 unsigned char original_sha1[20];
 100                 if (!read_replace_refs)
 101                         return 0;
 102                 if (get_sha1_hex(refname + 13, original_sha1)) {
 103                         warning("invalid replace ref %s", refname);
 104                         return 0;
 105                 }
 106                 obj = parse_object(original_sha1);
 107                 if (obj)
 108                         add_name_decoration(DECORATION_GRAFTED, "replaced", obj);
 109                 return 0;
 110         }
 111
 112         obj = parse_object(sha1);
 113         if (!obj)
 114                 return 0;
 115
 116         if (!prefixcmp(refname, "refs/heads/"))
 117                 type = DECORATION_REF_LOCAL;
 118         else if (!prefixcmp(refname, "refs/remotes/"))
 119                 type = DECORATION_REF_REMOTE;
 120         else if (!prefixcmp(refname, "refs/tags/"))
 121                 type = DECORATION_REF_TAG;
 122         else if (!prefixcmp(refname, "refs/stash"))
 123                 type = DECORATION_REF_STASH;
 124         else if (!prefixcmp(refname, "HEAD"))
 125                 type = DECORATION_REF_HEAD;
 126
 127         if (!cb_data || *(int *)cb_data == DECORATE_SHORT_REFS)
 128                 refname = prettify_refname(refname);
 129         add_name_decoration(type, refname, obj);
 130         while (obj->type == OBJ_TAG) {
 131                 obj = ((struct tag *)obj)->tagged;
 132                 if (!obj)
 133                         break;
 134                 add_name_decoration(DECORATION_REF_TAG, refname, obj);
 135         }
 136         return 0;
 137 }
 138
 139 static int add_graft_decoration(const struct commit_graft *graft, void *cb_data)
 140 {
 141         struct commit *commit = lookup_commit(graft->sha1);
 142         if (!commit)
 143                 return 0;
 144         add_name_decoration(DECORATION_GRAFTED, "grafted", &commit->object);
 145         return 0;
 146 }
 147
 148 void load_ref_decorations(int flags)
 149 {
 150         static int loaded;
 151         if (!loaded) {
 152                 loaded = 1;
 153                 for_each_ref(add_ref_decoration, &flags);
 154                 head_ref(add_ref_decoration, &flags);
 155                 for_each_commit_graft(add_graft_decoration, NULL);
 156         }
 157 }
 158
 159 static void show_parents(struct commit *commit, int abbrev)
 160 {
 161         struct commit_list *p;
 162         for (p = commit->parents; p ; p = p->next) {
 163                 struct commit *parent = p->item;
 164                 printf(" %s", find_unique_abbrev(parent->object.sha1, abbrev));
 165         }
 166 }
 167
 168 void show_decorations(struct rev_info *opt, struct commit *commit)
 169 {
 170         const char *prefix;
 171         struct name_decoration *decoration;
 172         const char *color_commit =
 173                 diff_get_color_opt(&opt->diffopt, DIFF_COMMIT);
 174         const char *color_reset =
 175                 decorate_get_color_opt(&opt->diffopt, DECORATION_NONE);
 176
 177         if (opt->show_source && commit->util)
 178                 printf("\t%s", (char *) commit->util);
 179         if (!opt->show_decorations)
 180                 return;
 181         decoration = lookup_decoration(&name_decoration, &commit->object);
 182         if (!decoration)
 183                 return;
 184         prefix = " (";
 185         while (decoration) {
 186                 printf("%s", prefix);
 187                 fputs(decorate_get_color_opt(&opt->diffopt, decoration->type),
 188                       stdout);
 189                 if (decoration->type == DECORATION_REF_TAG)
 190                         fputs("tag: ", stdout);
 191                 printf("%s", decoration->name);
 192                 fputs(color_reset, stdout);
 193                 fputs(color_commit, stdout);
 194                 prefix = ", ";
 195                 decoration = decoration->next;
 196         }
 197         putchar(')');
 198 }
 199
 200 /*
 201  * Search for "^[-A-Za-z]+: [^@]+@" pattern. It usually matches
 202  * Signed-off-by: and Acked-by: lines.
 203  */
 204 static int detect_any_signoff(char *letter, int size)
 205 {
 206         char *cp;
 207         int seen_colon = 0;
 208         int seen_at = 0;
 209         int seen_name = 0;
 210         int seen_head = 0;
 211
 212         cp = letter + size;
 213         while (letter <= --cp && *cp == '\n')
 214                 continue;
 215
 216         while (letter <= cp) {
 217                 char ch = *cp--;
 218                 if (ch == '\n')
 219                         break;
 220
 221                 if (!seen_at) {
 222                         if (ch == '@')
 223                                 seen_at = 1;
 224                         continue;
 225                 }
 226                 if (!seen_colon) {
 227                         if (ch == '@')
 228                                 return 0;
 229                         else if (ch == ':')
 230                                 seen_colon = 1;
 231                         else
 232                                 seen_name = 1;
 233                         continue;
 234                 }
 235                 if (('A' <= ch && ch <= 'Z') ||
 236                     ('a' <= ch && ch <= 'z') ||
 237                     ch == '-') {
 238                         seen_head = 1;
 239                         continue;
 240                 }
 241                 /* no empty last line doesn't match */
 242                 return 0;
 243         }
 244         return seen_head && seen_name;
 245 }
 246
 247 static void append_signoff(struct strbuf *sb, const char *signoff)
 248 {
 249         static const char signed_off_by[] = "Signed-off-by: ";
 250         size_t signoff_len = strlen(signoff);
 251         int has_signoff = 0;
 252         char *cp;
 253
 254         cp = sb->buf;
 255
 256         /* First see if we already have the sign-off by the signer */
 257         while ((cp = strstr(cp, signed_off_by))) {
 258
 259                 has_signoff = 1;
 260
 261                 cp += strlen(signed_off_by);
 262                 if (cp + signoff_len >= sb->buf + sb->len)
 263                         break;
 264                 if (strncmp(cp, signoff, signoff_len))
 265                         continue;
 266                 if (!isspace(cp[signoff_len]))
 267                         continue;
 268                 /* we already have him */
 269                 return;
 270         }
 271
 272         if (!has_signoff)
 273                 has_signoff = detect_any_signoff(sb->buf, sb->len);
 274
 275         if (!has_signoff)
 276                 strbuf_addch(sb, '\n');
 277
 278         strbuf_addstr(sb, signed_off_by);
 279         strbuf_add(sb, signoff, signoff_len);
 280         strbuf_addch(sb, '\n');
 281 }
 282
 283 static unsigned int digits_in_number(unsigned int number)
 284 {
 285         unsigned int i = 10, result = 1;
 286         while (i <= number) {
 287                 i *= 10;
 288                 result++;
 289         }
 290         return result;
 291 }
 292
 293 void get_patch_filename(struct commit *commit, int nr, const char *suffix,
 294                         struct strbuf *buf)
 295 {
 296         int suffix_len = strlen(suffix) + 1;
 297         int start_len = buf->len;
 298
 299         strbuf_addf(buf, commit ? "%04d-" : "%d", nr);
 300         if (commit) {
 301                 int max_len = start_len + FORMAT_PATCH_NAME_MAX - suffix_len;
 302                 struct pretty_print_context ctx = {0};
 303                 ctx.date_mode = DATE_NORMAL;
 304
 305                 format_commit_message(commit, "%f", buf, &ctx);
 306                 if (max_len < buf->len)
 307                         strbuf_setlen(buf, max_len);
 308                 strbuf_addstr(buf, suffix);
 309         }
 310 }
 311
 312 void log_write_email_headers(struct rev_info *opt, struct commit *commit,
 313                              const char **subject_p,
 314                              const char **extra_headers_p,
 315                              int *need_8bit_cte_p)
 316 {
 317         const char *subject = NULL;
 318         const char *extra_headers = opt->extra_headers;
 319         const char *name = sha1_to_hex(commit->object.sha1);
 320
 321         *need_8bit_cte_p = 0; /* unknown */
 322         if (opt->total > 0) {
 323                 static char buffer[64];
 324                 snprintf(buffer, sizeof(buffer),
 325                          "Subject: [%s%s%0*d/%d] ",
 326                          opt->subject_prefix,
 327                          *opt->subject_prefix ? " " : "",
 328                          digits_in_number(opt->total),
 329                          opt->nr, opt->total);
 330                 subject = buffer;
 331         } else if (opt->total == 0 && opt->subject_prefix && *opt->subject_prefix) {
 332                 static char buffer[256];
 333                 snprintf(buffer, sizeof(buffer),
 334                          "Subject: [%s] ",
 335                          opt->subject_prefix);
 336                 subject = buffer;
 337         } else {
 338                 subject = "Subject: ";
 339         }
 340
 341         printf("From %s Mon Sep 17 00:00:00 2001\n", name);
 342         graph_show_oneline(opt->graph);
 343         if (opt->message_id) {
 344                 printf("Message-Id: <%s>\n", opt->message_id);
 345                 graph_show_oneline(opt->graph);
 346         }
 347         if (opt->ref_message_ids && opt->ref_message_ids->nr > 0) {
 348                 int i, n;
 349                 n = opt->ref_message_ids->nr;
 350                 printf("In-Reply-To: <%s>\n", opt->ref_message_ids->items[n-1].string);
 351                 for (i = 0; i < n; i++)
 352                         printf("%s<%s>\n", (i > 0 ? "\t" : "References: "),
 353                                opt->ref_message_ids->items[i].string);
 354                 graph_show_oneline(opt->graph);
 355         }
 356         if (opt->mime_boundary) {
 357                 static char subject_buffer[1024];
 358                 static char buffer[1024];
 359                 struct strbuf filename =  STRBUF_INIT;
 360                 *need_8bit_cte_p = -1; /* NEVER */
 361                 snprintf(subject_buffer, sizeof(subject_buffer) - 1,
 362                          "%s"
 363                          "MIME-Version: 1.0\n"
 364                          "Content-Type: multipart/mixed;"
 365                          " boundary=\"%s%s\"\n"
 366                          "\n"
 367                          "This is a multi-part message in MIME "
 368                          "format.\n"
 369                          "--%s%s\n"
 370                          "Content-Type: text/plain; "
 371                          "charset=UTF-8; format=fixed\n"
 372                          "Content-Transfer-Encoding: 8bit\n\n",
 373                          extra_headers ? extra_headers : "",
 374                          mime_boundary_leader, opt->mime_boundary,
 375                          mime_boundary_leader, opt->mime_boundary);
 376                 extra_headers = subject_buffer;
 377
 378                 get_patch_filename(opt->numbered_files ? NULL : commit, opt->nr,
 379                                     opt->patch_suffix, &filename);
 380                 snprintf(buffer, sizeof(buffer) - 1,
 381                          "\n--%s%s\n"
 382                          "Content-Type: text/x-patch;"
 383                          " name=\"%s\"\n"
 384                          "Content-Transfer-Encoding: 8bit\n"
 385                          "Content-Disposition: %s;"
 386                          " filename=\"%s\"\n\n",
 387                          mime_boundary_leader, opt->mime_boundary,
 388                          filename.buf,
 389                          opt->no_inline ? "attachment" : "inline",
 390                          filename.buf);
 391                 opt->diffopt.stat_sep = buffer;
 392                 strbuf_release(&filename);
 393         }
 394         *subject_p = subject;
 395         *extra_headers_p = extra_headers;
 396 }
 397
 398 void show_log(struct rev_info *opt)
 399 {
 400         struct strbuf msgbuf = STRBUF_INIT;
 401         struct log_info *log = opt->loginfo;
 402         struct commit *commit = log->commit, *parent = log->parent;
 403         int abbrev_commit = opt->abbrev_commit ? opt->abbrev : 40;
 404         const char *extra_headers = opt->extra_headers;
 405         struct pretty_print_context ctx = {0};
 406
 407         opt->loginfo = NULL;
 408         ctx.show_notes = opt->show_notes;
 409         if (!opt->verbose_header) {
 410                 graph_show_commit(opt->graph);
 411
 412                 if (!opt->graph)
 413                         put_revision_mark(opt, commit);
 414                 fputs(find_unique_abbrev(commit->object.sha1, abbrev_commit), stdout);
 415                 if (opt->print_parents)
 416                         show_parents(commit, abbrev_commit);
 417                 show_decorations(opt, commit);
 418                 if (opt->graph && !graph_is_commit_finished(opt->graph)) {
 419                         putchar('\n');
 420                         graph_show_remainder(opt->graph);
 421                 }
 422                 putchar(opt->diffopt.line_termination);
 423                 return;
 424         }
 425
 426         /*
 427          * If use_terminator is set, we already handled any record termination
 428          * at the end of the last record.
 429          * Otherwise, add a diffopt.line_termination character before all
 430          * entries but the first.  (IOW, as a separator between entries)
 431          */
 432         if (opt->shown_one && !opt->use_terminator) {
 433                 /*
 434                  * If entries are separated by a newline, the output
 435                  * should look human-readable.  If the last entry ended
 436                  * with a newline, print the graph output before this
 437                  * newline.  Otherwise it will end up as a completely blank
 438                  * line and will look like a gap in the graph.
 439                  *
 440                  * If the entry separator is not a newline, the output is
 441                  * primarily intended for programmatic consumption, and we
 442                  * never want the extra graph output before the entry
 443                  * separator.
 444                  */
 445                 if (opt->diffopt.line_termination == '\n' &&
 446                     !opt->missing_newline)
 447                         graph_show_padding(opt->graph);
 448                 putchar(opt->diffopt.line_termination);
 449         }
 450         opt->shown_one = 1;
 451
 452         /*
 453          * If the history graph was requested,
 454          * print the graph, up to this commit's line
 455          */
 456         graph_show_commit(opt->graph);
 457
 458         /*
 459          * Print header line of header..
 460          */
 461
 462         if (opt->commit_format == CMIT_FMT_EMAIL) {
 463                 log_write_email_headers(opt, commit, &ctx.subject, &extra_headers,
 464                                         &ctx.need_8bit_cte);
 465         } else if (opt->commit_format != CMIT_FMT_USERFORMAT) {
 466                 fputs(diff_get_color_opt(&opt->diffopt, DIFF_COMMIT), stdout);
 467                 if (opt->commit_format != CMIT_FMT_ONELINE)
 468                         fputs("commit ", stdout);
 469
 470                 if (!opt->graph)
 471                         put_revision_mark(opt, commit);
 472                 fputs(find_unique_abbrev(commit->object.sha1, abbrev_commit),
 473                       stdout);
 474                 if (opt->print_parents)
 475                         show_parents(commit, abbrev_commit);
 476                 if (parent)
 477                         printf(" (from %s)",
 478                                find_unique_abbrev(parent->object.sha1,
 479                                                   abbrev_commit));
 480                 show_decorations(opt, commit);
 481                 printf("%s", diff_get_color_opt(&opt->diffopt, DIFF_RESET));
 482                 if (opt->commit_format == CMIT_FMT_ONELINE) {
 483                         putchar(' ');
 484                 } else {
 485                         putchar('\n');
 486                         graph_show_oneline(opt->graph);
 487                 }
 488                 if (opt->reflog_info) {
 489                         /*
 490                          * setup_revisions() ensures that opt->reflog_info
 491                          * and opt->graph cannot both be set,
 492                          * so we don't need to worry about printing the
 493                          * graph info here.
 494                          */
 495                         show_reflog_message(opt->reflog_info,
 496                                     opt->commit_format == CMIT_FMT_ONELINE,
 497                                     opt->date_mode_explicit ?
 498                                         opt->date_mode :
 499                                         DATE_NORMAL);
 500                         if (opt->commit_format == CMIT_FMT_ONELINE)
 501                                 return;
 502                 }
 503         }
 504
 505         if (!commit->buffer)
 506                 return;
 507
 508         /*
 509          * And then the pretty-printed message itself
 510          */
 511         if (ctx.need_8bit_cte >= 0)
 512                 ctx.need_8bit_cte = has_non_ascii(opt->add_signoff);
 513         ctx.date_mode = opt->date_mode;
 514         ctx.abbrev = opt->diffopt.abbrev;
 515         ctx.after_subject = extra_headers;
 516         ctx.preserve_subject = opt->preserve_subject;
 517         ctx.reflog_info = opt->reflog_info;
 518         ctx.fmt = opt->commit_format;
 519         pretty_print_commit(&ctx, commit, &msgbuf);
 520
 521         if (opt->add_signoff)
 522                 append_signoff(&msgbuf, opt->add_signoff);
 523         if (opt->show_log_size) {
 524                 printf("log size %i\n", (int)msgbuf.len);
 525                 graph_show_oneline(opt->graph);
 526         }
 527
 528         /*
 529          * Set opt->missing_newline if msgbuf doesn't
 530          * end in a newline (including if it is empty)
 531          */
 532         if (!msgbuf.len || msgbuf.buf[msgbuf.len - 1] != '\n')
 533                 opt->missing_newline = 1;
 534         else
 535                 opt->missing_newline = 0;
 536
 537         if (opt->graph)
 538                 graph_show_commit_msg(opt->graph, &msgbuf);
 539         else
 540                 fwrite(msgbuf.buf, sizeof(char), msgbuf.len, stdout);
 541         if (opt->use_terminator) {
 542                 if (!opt->missing_newline)
 543                         graph_show_padding(opt->graph);
 544                 putchar('\n');
 545         }
 546
 547         strbuf_release(&msgbuf);
 548 }
 549
 550 int log_tree_diff_flush(struct rev_info *opt)
 551 {
 552         diffcore_std(&opt->diffopt);
 553
 554         if (diff_queue_is_empty()) {
 555                 int saved_fmt = opt->diffopt.output_format;
 556                 opt->diffopt.output_format = DIFF_FORMAT_NO_OUTPUT;
 557                 diff_flush(&opt->diffopt);
 558                 opt->diffopt.output_format = saved_fmt;
 559                 return 0;
 560         }
 561
 562         if (opt->loginfo && !opt->no_commit_id) {
 563                 /* When showing a verbose header (i.e. log message),
 564                  * and not in --pretty=oneline format, we would want
 565                  * an extra newline between the end of log and the
 566                  * output for readability.
 567                  */
 568                 show_log(opt);
 569                 if ((opt->diffopt.output_format & ~DIFF_FORMAT_NO_OUTPUT) &&
 570                     opt->verbose_header &&
 571                     opt->commit_format != CMIT_FMT_ONELINE) {
 572                         int pch = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_PATCH;
 573                         if ((pch & opt->diffopt.output_format) == pch)
 574                                 printf("---");
 575                         if (opt->diffopt.output_prefix) {
 576                                 struct strbuf *msg = NULL;
 577                                 msg = opt->diffopt.output_prefix(&opt->diffopt,
 578                                         opt->diffopt.output_prefix_data);
 579                                 fwrite(msg->buf, msg->len, 1, stdout);
 580                         }
 581                         putchar('\n');
 582                 }
 583         }
 584         diff_flush(&opt->diffopt);
 585         return 1;
 586 }
 587
 588 static int do_diff_combined(struct rev_info *opt, struct commit *commit)
 589 {
 590         unsigned const char *sha1 = commit->object.sha1;
 591
 592         diff_tree_combined_merge(sha1, opt->dense_combined_merges, opt);
 593         return !opt->loginfo;
 594 }
 595
 596 /*
 597  * Show the diff of a commit.
 598  *
 599  * Return true if we printed any log info messages
 600  */
 601 static int log_tree_diff(struct rev_info *opt, struct commit *commit, struct log_info *log)
 602 {
 603         int showed_log;
 604         struct commit_list *parents;
 605         unsigned const char *sha1 = commit->object.sha1;
 606
 607         if (!opt->diff && !DIFF_OPT_TST(&opt->diffopt, EXIT_WITH_STATUS))
 608                 return 0;
 609
 610         /* Root commit? */
 611         parents = commit->parents;
 612         if (!parents) {
 613                 if (opt->show_root_diff) {
 614                         diff_root_tree_sha1(sha1, "", &opt->diffopt);
 615                         log_tree_diff_flush(opt);
 616                 }
 617                 return !opt->loginfo;
 618         }
 619
 620         /* More than one parent? */
 621         if (parents && parents->next) {
 622                 if (opt->ignore_merges)
 623                         return 0;
 624                 else if (opt->combine_merges)
 625                         return do_diff_combined(opt, commit);
 626                 else if (opt->first_parent_only) {
 627                         /*
 628                          * Generate merge log entry only for the first
 629                          * parent, showing summary diff of the others
 630                          * we merged _in_.
 631                          */
 632                         diff_tree_sha1(parents->item->object.sha1, sha1, "", &opt->diffopt);
 633                         log_tree_diff_flush(opt);
 634                         return !opt->loginfo;
 635                 }
 636
 637                 /* If we show individual diffs, show the parent info */
 638                 log->parent = parents->item;
 639         }
 640
 641         showed_log = 0;
 642         for (;;) {
 643                 struct commit *parent = parents->item;
 644
 645                 diff_tree_sha1(parent->object.sha1, sha1, "", &opt->diffopt);
 646                 log_tree_diff_flush(opt);
 647
 648                 showed_log |= !opt->loginfo;
 649
 650                 /* Set up the log info for the next parent, if any.. */
 651                 parents = parents->next;
 652                 if (!parents)
 653                         break;
 654                 log->parent = parents->item;
 655                 opt->loginfo = log;
 656         }
 657         return showed_log;
 658 }
 659
 660 int log_tree_commit(struct rev_info *opt, struct commit *commit)
 661 {
 662         struct log_info log;
 663         int shown;
 664
 665         log.commit = commit;
 666         log.parent = NULL;
 667         opt->loginfo = &log;
 668
 669         shown = log_tree_diff(opt, commit, &log);
 670         if (!shown && opt->loginfo && opt->always_show_header) {
 671                 log.parent = NULL;
 672                 show_log(opt);
 673                 shown = 1;
 674         }
 675         opt->loginfo = NULL;
 676         maybe_flush_or_die(stdout, "stdout");
 677         return shown;
 678 }