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 #include "gpg-interface.h"
  12 #include "sequencer.h"
  13
  14 struct decoration name_decoration = { "object names" };
  15
  16 enum decoration_type {
  17         DECORATION_NONE = 0,
  18         DECORATION_REF_LOCAL,
  19         DECORATION_REF_REMOTE,
  20         DECORATION_REF_TAG,
  21         DECORATION_REF_STASH,
  22         DECORATION_REF_HEAD,
  23         DECORATION_GRAFTED,
  24 };
  25
  26 static char decoration_colors[][COLOR_MAXLEN] = {
  27         GIT_COLOR_RESET,
  28         GIT_COLOR_BOLD_GREEN,   /* REF_LOCAL */
  29         GIT_COLOR_BOLD_RED,     /* REF_REMOTE */
  30         GIT_COLOR_BOLD_YELLOW,  /* REF_TAG */
  31         GIT_COLOR_BOLD_MAGENTA, /* REF_STASH */
  32         GIT_COLOR_BOLD_CYAN,    /* REF_HEAD */
  33         GIT_COLOR_BOLD_BLUE,    /* GRAFTED */
  34 };
  35
  36 static const char *decorate_get_color(int decorate_use_color, enum decoration_type ix)
  37 {
  38         if (want_color(decorate_use_color))
  39                 return decoration_colors[ix];
  40         return "";
  41 }
  42
  43 static int parse_decorate_color_slot(const char *slot)
  44 {
  45         /*
  46          * We're comparing with 'ignore-case' on
  47          * (because config.c sets them all tolower),
  48          * but let's match the letters in the literal
  49          * string values here with how they are
  50          * documented in Documentation/config.txt, for
  51          * consistency.
  52          *
  53          * We love being consistent, don't we?
  54          */
  55         if (!strcasecmp(slot, "branch"))
  56                 return DECORATION_REF_LOCAL;
  57         if (!strcasecmp(slot, "remoteBranch"))
  58                 return DECORATION_REF_REMOTE;
  59         if (!strcasecmp(slot, "tag"))
  60                 return DECORATION_REF_TAG;
  61         if (!strcasecmp(slot, "stash"))
  62                 return DECORATION_REF_STASH;
  63         if (!strcasecmp(slot, "HEAD"))
  64                 return DECORATION_REF_HEAD;
  65         return -1;
  66 }
  67
  68 int parse_decorate_color_config(const char *var, const int ofs, const char *value)
  69 {
  70         int slot = parse_decorate_color_slot(var + ofs);
  71         if (slot < 0)
  72                 return 0;
  73         if (!value)
  74                 return config_error_nonbool(var);
  75         color_parse(value, var, decoration_colors[slot]);
  76         return 0;
  77 }
  78
  79 /*
  80  * log-tree.c uses DIFF_OPT_TST for determining whether to use color
  81  * for showing the commit sha1, use the same check for --decorate
  82  */
  83 #define decorate_get_color_opt(o, ix) \
  84         decorate_get_color((o)->use_color, ix)
  85
  86 static void add_name_decoration(enum decoration_type type, const char *name, struct object *obj)
  87 {
  88         int nlen = strlen(name);
  89         struct name_decoration *res = xmalloc(sizeof(struct name_decoration) + nlen);
  90         memcpy(res->name, name, nlen + 1);
  91         res->type = type;
  92         res->next = add_decoration(&name_decoration, obj, res);
  93 }
  94
  95 static int add_ref_decoration(const char *refname, const unsigned char *sha1, int flags, void *cb_data)
  96 {
  97         struct object *obj;
  98         enum decoration_type type = DECORATION_NONE;
  99
 100         if (!prefixcmp(refname, "refs/replace/")) {
 101                 unsigned char original_sha1[20];
 102                 if (!read_replace_refs)
 103                         return 0;
 104                 if (get_sha1_hex(refname + 13, original_sha1)) {
 105                         warning("invalid replace ref %s", refname);
 106                         return 0;
 107                 }
 108                 obj = parse_object(original_sha1);
 109                 if (obj)
 110                         add_name_decoration(DECORATION_GRAFTED, "replaced", obj);
 111                 return 0;
 112         }
 113
 114         obj = parse_object(sha1);
 115         if (!obj)
 116                 return 0;
 117
 118         if (!prefixcmp(refname, "refs/heads/"))
 119                 type = DECORATION_REF_LOCAL;
 120         else if (!prefixcmp(refname, "refs/remotes/"))
 121                 type = DECORATION_REF_REMOTE;
 122         else if (!prefixcmp(refname, "refs/tags/"))
 123                 type = DECORATION_REF_TAG;
 124         else if (!strcmp(refname, "refs/stash"))
 125                 type = DECORATION_REF_STASH;
 126         else if (!strcmp(refname, "HEAD"))
 127                 type = DECORATION_REF_HEAD;
 128
 129         if (!cb_data || *(int *)cb_data == DECORATE_SHORT_REFS)
 130                 refname = prettify_refname(refname);
 131         add_name_decoration(type, refname, obj);
 132         while (obj->type == OBJ_TAG) {
 133                 obj = ((struct tag *)obj)->tagged;
 134                 if (!obj)
 135                         break;
 136                 add_name_decoration(DECORATION_REF_TAG, refname, obj);
 137         }
 138         return 0;
 139 }
 140
 141 static int add_graft_decoration(const struct commit_graft *graft, void *cb_data)
 142 {
 143         struct commit *commit = lookup_commit(graft->sha1);
 144         if (!commit)
 145                 return 0;
 146         add_name_decoration(DECORATION_GRAFTED, "grafted", &commit->object);
 147         return 0;
 148 }
 149
 150 void load_ref_decorations(int flags)
 151 {
 152         static int loaded;
 153         if (!loaded) {
 154                 loaded = 1;
 155                 for_each_ref(add_ref_decoration, &flags);
 156                 head_ref(add_ref_decoration, &flags);
 157                 for_each_commit_graft(add_graft_decoration, NULL);
 158         }
 159 }
 160
 161 static void show_parents(struct commit *commit, int abbrev)
 162 {
 163         struct commit_list *p;
 164         for (p = commit->parents; p ; p = p->next) {
 165                 struct commit *parent = p->item;
 166                 printf(" %s", find_unique_abbrev(parent->object.sha1, 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                 printf(" %s", find_unique_abbrev(p->item->object.sha1, abbrev));
 175         }
 176 }
 177
 178 void show_decorations(struct rev_info *opt, struct commit *commit)
 179 {
 180         const char *prefix;
 181         struct name_decoration *decoration;
 182         const char *color_commit =
 183                 diff_get_color_opt(&opt->diffopt, DIFF_COMMIT);
 184         const char *color_reset =
 185                 decorate_get_color_opt(&opt->diffopt, DECORATION_NONE);
 186
 187         if (opt->show_source && commit->util)
 188                 printf("\t%s", (char *) commit->util);
 189         if (!opt->show_decorations)
 190                 return;
 191         decoration = lookup_decoration(&name_decoration, &commit->object);
 192         if (!decoration)
 193                 return;
 194         prefix = " (";
 195         while (decoration) {
 196                 printf("%s", prefix);
 197                 fputs(decorate_get_color_opt(&opt->diffopt, decoration->type),
 198                       stdout);
 199                 if (decoration->type == DECORATION_REF_TAG)
 200                         fputs("tag: ", stdout);
 201                 printf("%s", decoration->name);
 202                 fputs(color_reset, stdout);
 203                 fputs(color_commit, stdout);
 204                 prefix = ", ";
 205                 decoration = decoration->next;
 206         }
 207         putchar(')');
 208 }
 209
 210 static unsigned int digits_in_number(unsigned int number)
 211 {
 212         unsigned int i = 10, result = 1;
 213         while (i <= number) {
 214                 i *= 10;
 215                 result++;
 216         }
 217         return result;
 218 }
 219
 220 void fmt_output_subject(struct strbuf *filename,
 221                         const char *subject,
 222                         struct rev_info *info)
 223 {
 224         const char *suffix = info->patch_suffix;
 225         int nr = info->nr;
 226         int start_len = filename->len;
 227         int max_len = start_len + FORMAT_PATCH_NAME_MAX - (strlen(suffix) + 1);
 228
 229         if (0 < info->reroll_count)
 230                 strbuf_addf(filename, "v%d-", info->reroll_count);
 231         strbuf_addf(filename, "%04d-%s", nr, subject);
 232
 233         if (max_len < filename->len)
 234                 strbuf_setlen(filename, max_len);
 235         strbuf_addstr(filename, suffix);
 236 }
 237
 238 void fmt_output_commit(struct strbuf *filename,
 239                        struct commit *commit,
 240                        struct rev_info *info)
 241 {
 242         struct pretty_print_context ctx = {0};
 243         struct strbuf subject = STRBUF_INIT;
 244
 245         format_commit_message(commit, "%f", &subject, &ctx);
 246         fmt_output_subject(filename, subject.buf, info);
 247         strbuf_release(&subject);
 248 }
 249
 250 void log_write_email_headers(struct rev_info *opt, struct commit *commit,
 251                              const char **subject_p,
 252                              const char **extra_headers_p,
 253                              int *need_8bit_cte_p)
 254 {
 255         const char *subject = NULL;
 256         const char *extra_headers = opt->extra_headers;
 257         const char *name = sha1_to_hex(commit->object.sha1);
 258
 259         *need_8bit_cte_p = 0; /* unknown */
 260         if (opt->total > 0) {
 261                 static char buffer[64];
 262                 snprintf(buffer, sizeof(buffer),
 263                          "Subject: [%s%s%0*d/%d] ",
 264                          opt->subject_prefix,
 265                          *opt->subject_prefix ? " " : "",
 266                          digits_in_number(opt->total),
 267                          opt->nr, opt->total);
 268                 subject = buffer;
 269         } else if (opt->total == 0 && opt->subject_prefix && *opt->subject_prefix) {
 270                 static char buffer[256];
 271                 snprintf(buffer, sizeof(buffer),
 272                          "Subject: [%s] ",
 273                          opt->subject_prefix);
 274                 subject = buffer;
 275         } else {
 276                 subject = "Subject: ";
 277         }
 278
 279         printf("From %s Mon Sep 17 00:00:00 2001\n", name);
 280         graph_show_oneline(opt->graph);
 281         if (opt->message_id) {
 282                 printf("Message-Id: <%s>\n", opt->message_id);
 283                 graph_show_oneline(opt->graph);
 284         }
 285         if (opt->ref_message_ids && opt->ref_message_ids->nr > 0) {
 286                 int i, n;
 287                 n = opt->ref_message_ids->nr;
 288                 printf("In-Reply-To: <%s>\n", opt->ref_message_ids->items[n-1].string);
 289                 for (i = 0; i < n; i++)
 290                         printf("%s<%s>\n", (i > 0 ? "\t" : "References: "),
 291                                opt->ref_message_ids->items[i].string);
 292                 graph_show_oneline(opt->graph);
 293         }
 294         if (opt->mime_boundary) {
 295                 static char subject_buffer[1024];
 296                 static char buffer[1024];
 297                 struct strbuf filename =  STRBUF_INIT;
 298                 *need_8bit_cte_p = -1; /* NEVER */
 299                 snprintf(subject_buffer, sizeof(subject_buffer) - 1,
 300                          "%s"
 301                          "MIME-Version: 1.0\n"
 302                          "Content-Type: multipart/mixed;"
 303                          " boundary=\"%s%s\"\n"
 304                          "\n"
 305                          "This is a multi-part message in MIME "
 306                          "format.\n"
 307                          "--%s%s\n"
 308                          "Content-Type: text/plain; "
 309                          "charset=UTF-8; format=fixed\n"
 310                          "Content-Transfer-Encoding: 8bit\n\n",
 311                          extra_headers ? extra_headers : "",
 312                          mime_boundary_leader, opt->mime_boundary,
 313                          mime_boundary_leader, opt->mime_boundary);
 314                 extra_headers = subject_buffer;
 315
 316                 if (opt->numbered_files)
 317                         strbuf_addf(&filename, "%d", opt->nr);
 318                 else
 319                         fmt_output_commit(&filename, commit, opt);
 320                 snprintf(buffer, sizeof(buffer) - 1,
 321                          "\n--%s%s\n"
 322                          "Content-Type: text/x-patch;"
 323                          " name=\"%s\"\n"
 324                          "Content-Transfer-Encoding: 8bit\n"
 325                          "Content-Disposition: %s;"
 326                          " filename=\"%s\"\n\n",
 327                          mime_boundary_leader, opt->mime_boundary,
 328                          filename.buf,
 329                          opt->no_inline ? "attachment" : "inline",
 330                          filename.buf);
 331                 opt->diffopt.stat_sep = buffer;
 332                 strbuf_release(&filename);
 333         }
 334         *subject_p = subject;
 335         *extra_headers_p = extra_headers;
 336 }
 337
 338 static void show_sig_lines(struct rev_info *opt, int status, const char *bol)
 339 {
 340         const char *color, *reset, *eol;
 341
 342         color = diff_get_color_opt(&opt->diffopt,
 343                                    status ? DIFF_WHITESPACE : DIFF_FRAGINFO);
 344         reset = diff_get_color_opt(&opt->diffopt, DIFF_RESET);
 345         while (*bol) {
 346                 eol = strchrnul(bol, '\n');
 347                 printf("%s%.*s%s%s", color, (int)(eol - bol), bol, reset,
 348                        *eol ? "\n" : "");
 349                 bol = (*eol) ? (eol + 1) : eol;
 350         }
 351 }
 352
 353 static void show_signature(struct rev_info *opt, struct commit *commit)
 354 {
 355         struct strbuf payload = STRBUF_INIT;
 356         struct strbuf signature = STRBUF_INIT;
 357         struct strbuf gpg_output = STRBUF_INIT;
 358         int status;
 359
 360         if (parse_signed_commit(commit->object.sha1, &payload, &signature) <= 0)
 361                 goto out;
 362
 363         status = verify_signed_buffer(payload.buf, payload.len,
 364                                       signature.buf, signature.len,
 365                                       &gpg_output, NULL);
 366         if (status && !gpg_output.len)
 367                 strbuf_addstr(&gpg_output, "No signature\n");
 368
 369         show_sig_lines(opt, status, gpg_output.buf);
 370
 371  out:
 372         strbuf_release(&gpg_output);
 373         strbuf_release(&payload);
 374         strbuf_release(&signature);
 375 }
 376
 377 static int which_parent(const unsigned char *sha1, const struct commit *commit)
 378 {
 379         int nth;
 380         const struct commit_list *parent;
 381
 382         for (nth = 0, parent = commit->parents; parent; parent = parent->next) {
 383                 if (!hashcmp(parent->item->object.sha1, sha1))
 384                         return nth;
 385                 nth++;
 386         }
 387         return -1;
 388 }
 389
 390 static int is_common_merge(const struct commit *commit)
 391 {
 392         return (commit->parents
 393                 && commit->parents->next
 394                 && !commit->parents->next->next);
 395 }
 396
 397 static void show_one_mergetag(struct rev_info *opt,
 398                               struct commit_extra_header *extra,
 399                               struct commit *commit)
 400 {
 401         unsigned char sha1[20];
 402         struct tag *tag;
 403         struct strbuf verify_message;
 404         int status, nth;
 405         size_t payload_size, gpg_message_offset;
 406
 407         hash_sha1_file(extra->value, extra->len, typename(OBJ_TAG), sha1);
 408         tag = lookup_tag(sha1);
 409         if (!tag)
 410                 return; /* error message already given */
 411
 412         strbuf_init(&verify_message, 256);
 413         if (parse_tag_buffer(tag, extra->value, extra->len))
 414                 strbuf_addstr(&verify_message, "malformed mergetag\n");
 415         else if (is_common_merge(commit) &&
 416                  !hashcmp(tag->tagged->sha1,
 417                           commit->parents->next->item->object.sha1))
 418                 strbuf_addf(&verify_message,
 419                             "merged tag '%s'\n", tag->tag);
 420         else if ((nth = which_parent(tag->tagged->sha1, commit)) < 0)
 421                 strbuf_addf(&verify_message, "tag %s names a non-parent %s\n",
 422                                     tag->tag, tag->tagged->sha1);
 423         else
 424                 strbuf_addf(&verify_message,
 425                             "parent #%d, tagged '%s'\n", nth + 1, tag->tag);
 426         gpg_message_offset = verify_message.len;
 427
 428         payload_size = parse_signature(extra->value, extra->len);
 429         status = -1;
 430         if (extra->len > payload_size)
 431                 if (verify_signed_buffer(extra->value, payload_size,
 432                                          extra->value + payload_size,
 433                                          extra->len - payload_size,
 434                                          &verify_message, NULL)) {
 435                         if (verify_message.len <= gpg_message_offset)
 436                                 strbuf_addstr(&verify_message, "No signature\n");
 437                         else
 438                                 status = 0;
 439                 }
 440
 441         show_sig_lines(opt, status, verify_message.buf);
 442         strbuf_release(&verify_message);
 443 }
 444
 445 static void show_mergetag(struct rev_info *opt, struct commit *commit)
 446 {
 447         struct commit_extra_header *extra, *to_free;
 448
 449         to_free = read_commit_extra_headers(commit, NULL);
 450         for (extra = to_free; extra; extra = extra->next) {
 451                 if (strcmp(extra->key, "mergetag"))
 452                         continue; /* not a merge tag */
 453                 show_one_mergetag(opt, extra, commit);
 454         }
 455         free_commit_extra_headers(to_free);
 456 }
 457
 458 void show_log(struct rev_info *opt)
 459 {
 460         struct strbuf msgbuf = STRBUF_INIT;
 461         struct log_info *log = opt->loginfo;
 462         struct commit *commit = log->commit, *parent = log->parent;
 463         int abbrev_commit = opt->abbrev_commit ? opt->abbrev : 40;
 464         const char *extra_headers = opt->extra_headers;
 465         struct pretty_print_context ctx = {0};
 466
 467         opt->loginfo = NULL;
 468         if (!opt->verbose_header) {
 469                 graph_show_commit(opt->graph);
 470
 471                 if (!opt->graph)
 472                         put_revision_mark(opt, commit);
 473                 fputs(find_unique_abbrev(commit->object.sha1, abbrev_commit), stdout);
 474                 if (opt->print_parents)
 475                         show_parents(commit, abbrev_commit);
 476                 if (opt->children.name)
 477                         show_children(opt, commit, abbrev_commit);
 478                 show_decorations(opt, commit);
 479                 if (opt->graph && !graph_is_commit_finished(opt->graph)) {
 480                         putchar('\n');
 481                         graph_show_remainder(opt->graph);
 482                 }
 483                 putchar(opt->diffopt.line_termination);
 484                 return;
 485         }
 486
 487         /*
 488          * If use_terminator is set, we already handled any record termination
 489          * at the end of the last record.
 490          * Otherwise, add a diffopt.line_termination character before all
 491          * entries but the first.  (IOW, as a separator between entries)
 492          */
 493         if (opt->shown_one && !opt->use_terminator) {
 494                 /*
 495                  * If entries are separated by a newline, the output
 496                  * should look human-readable.  If the last entry ended
 497                  * with a newline, print the graph output before this
 498                  * newline.  Otherwise it will end up as a completely blank
 499                  * line and will look like a gap in the graph.
 500                  *
 501                  * If the entry separator is not a newline, the output is
 502                  * primarily intended for programmatic consumption, and we
 503                  * never want the extra graph output before the entry
 504                  * separator.
 505                  */
 506                 if (opt->diffopt.line_termination == '\n' &&
 507                     !opt->missing_newline)
 508                         graph_show_padding(opt->graph);
 509                 putchar(opt->diffopt.line_termination);
 510         }
 511         opt->shown_one = 1;
 512
 513         /*
 514          * If the history graph was requested,
 515          * print the graph, up to this commit's line
 516          */
 517         graph_show_commit(opt->graph);
 518
 519         /*
 520          * Print header line of header..
 521          */
 522
 523         if (opt->commit_format == CMIT_FMT_EMAIL) {
 524                 log_write_email_headers(opt, commit, &ctx.subject, &extra_headers,
 525                                         &ctx.need_8bit_cte);
 526         } else if (opt->commit_format != CMIT_FMT_USERFORMAT) {
 527                 fputs(diff_get_color_opt(&opt->diffopt, DIFF_COMMIT), stdout);
 528                 if (opt->commit_format != CMIT_FMT_ONELINE)
 529                         fputs("commit ", stdout);
 530
 531                 if (!opt->graph)
 532                         put_revision_mark(opt, commit);
 533                 fputs(find_unique_abbrev(commit->object.sha1, abbrev_commit),
 534                       stdout);
 535                 if (opt->print_parents)
 536                         show_parents(commit, abbrev_commit);
 537                 if (opt->children.name)
 538                         show_children(opt, commit, abbrev_commit);
 539                 if (parent)
 540                         printf(" (from %s)",
 541                                find_unique_abbrev(parent->object.sha1,
 542                                                   abbrev_commit));
 543                 show_decorations(opt, commit);
 544                 printf("%s", diff_get_color_opt(&opt->diffopt, DIFF_RESET));
 545                 if (opt->commit_format == CMIT_FMT_ONELINE) {
 546                         putchar(' ');
 547                 } else {
 548                         putchar('\n');
 549                         graph_show_oneline(opt->graph);
 550                 }
 551                 if (opt->reflog_info) {
 552                         /*
 553                          * setup_revisions() ensures that opt->reflog_info
 554                          * and opt->graph cannot both be set,
 555                          * so we don't need to worry about printing the
 556                          * graph info here.
 557                          */
 558                         show_reflog_message(opt->reflog_info,
 559                                             opt->commit_format == CMIT_FMT_ONELINE,
 560                                             opt->date_mode,
 561                                             opt->date_mode_explicit);
 562                         if (opt->commit_format == CMIT_FMT_ONELINE)
 563                                 return;
 564                 }
 565         }
 566
 567         if (opt->show_signature) {
 568                 show_signature(opt, commit);
 569                 show_mergetag(opt, commit);
 570         }
 571
 572         if (!commit->buffer)
 573                 return;
 574
 575         if (opt->show_notes) {
 576                 int raw;
 577                 struct strbuf notebuf = STRBUF_INIT;
 578
 579                 raw = (opt->commit_format == CMIT_FMT_USERFORMAT);
 580                 format_display_notes(commit->object.sha1, &notebuf,
 581                                      get_log_output_encoding(), raw);
 582                 ctx.notes_message = notebuf.len
 583                         ? strbuf_detach(&notebuf, NULL)
 584                         : xcalloc(1, 1);
 585         }
 586
 587         /*
 588          * And then the pretty-printed message itself
 589          */
 590         if (ctx.need_8bit_cte >= 0 && opt->add_signoff)
 591                 ctx.need_8bit_cte =
 592                         has_non_ascii(fmt_name(getenv("GIT_COMMITTER_NAME"),
 593                                                getenv("GIT_COMMITTER_EMAIL")));
 594         ctx.date_mode = opt->date_mode;
 595         ctx.date_mode_explicit = opt->date_mode_explicit;
 596         ctx.abbrev = opt->diffopt.abbrev;
 597         ctx.after_subject = extra_headers;
 598         ctx.preserve_subject = opt->preserve_subject;
 599         ctx.reflog_info = opt->reflog_info;
 600         ctx.fmt = opt->commit_format;
 601         ctx.mailmap = opt->mailmap;
 602         ctx.color = opt->diffopt.use_color;
 603         pretty_print_commit(&ctx, commit, &msgbuf);
 604
 605         if (opt->add_signoff)
 606                 append_signoff(&msgbuf, 0, APPEND_SIGNOFF_DEDUP);
 607
 608         if ((ctx.fmt != CMIT_FMT_USERFORMAT) &&
 609             ctx.notes_message && *ctx.notes_message) {
 610                 if (ctx.fmt == CMIT_FMT_EMAIL) {
 611                         strbuf_addstr(&msgbuf, "---\n");
 612                         opt->shown_dashes = 1;
 613                 }
 614                 strbuf_addstr(&msgbuf, ctx.notes_message);
 615         }
 616
 617         if (opt->show_log_size) {
 618                 printf("log size %i\n", (int)msgbuf.len);
 619                 graph_show_oneline(opt->graph);
 620         }
 621
 622         /*
 623          * Set opt->missing_newline if msgbuf doesn't
 624          * end in a newline (including if it is empty)
 625          */
 626         if (!msgbuf.len || msgbuf.buf[msgbuf.len - 1] != '\n')
 627                 opt->missing_newline = 1;
 628         else
 629                 opt->missing_newline = 0;
 630
 631         if (opt->graph)
 632                 graph_show_commit_msg(opt->graph, &msgbuf);
 633         else
 634                 fwrite(msgbuf.buf, sizeof(char), msgbuf.len, stdout);
 635         if (opt->use_terminator) {
 636                 if (!opt->missing_newline)
 637                         graph_show_padding(opt->graph);
 638                 putchar(opt->diffopt.line_termination);
 639         }
 640
 641         strbuf_release(&msgbuf);
 642         free(ctx.notes_message);
 643 }
 644
 645 int log_tree_diff_flush(struct rev_info *opt)
 646 {
 647         opt->shown_dashes = 0;
 648         diffcore_std(&opt->diffopt);
 649
 650         if (diff_queue_is_empty()) {
 651                 int saved_fmt = opt->diffopt.output_format;
 652                 opt->diffopt.output_format = DIFF_FORMAT_NO_OUTPUT;
 653                 diff_flush(&opt->diffopt);
 654                 opt->diffopt.output_format = saved_fmt;
 655                 return 0;
 656         }
 657
 658         if (opt->loginfo && !opt->no_commit_id) {
 659                 show_log(opt);
 660                 if ((opt->diffopt.output_format & ~DIFF_FORMAT_NO_OUTPUT) &&
 661                     opt->verbose_header &&
 662                     opt->commit_format != CMIT_FMT_ONELINE) {
 663                         /*
 664                          * When showing a verbose header (i.e. log message),
 665                          * and not in --pretty=oneline format, we would want
 666                          * an extra newline between the end of log and the
 667                          * diff/diffstat output for readability.
 668                          */
 669                         int pch = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_PATCH;
 670                         if (opt->diffopt.output_prefix) {
 671                                 struct strbuf *msg = NULL;
 672                                 msg = opt->diffopt.output_prefix(&opt->diffopt,
 673                                         opt->diffopt.output_prefix_data);
 674                                 fwrite(msg->buf, msg->len, 1, stdout);
 675                         }
 676
 677                         /*
 678                          * We may have shown three-dashes line early
 679                          * between notes and the log message, in which
 680                          * case we only want a blank line after the
 681                          * notes without (an extra) three-dashes line.
 682                          * Otherwise, we show the three-dashes line if
 683                          * we are showing the patch with diffstat, but
 684                          * in that case, there is no extra blank line
 685                          * after the three-dashes line.
 686                          */
 687                         if (!opt->shown_dashes &&
 688                             (pch & opt->diffopt.output_format) == pch)
 689                                 printf("---");
 690                         putchar('\n');
 691                 }
 692         }
 693         diff_flush(&opt->diffopt);
 694         return 1;
 695 }
 696
 697 static int do_diff_combined(struct rev_info *opt, struct commit *commit)
 698 {
 699         diff_tree_combined_merge(commit, opt->dense_combined_merges, opt);
 700         return !opt->loginfo;
 701 }
 702
 703 /*
 704  * Show the diff of a commit.
 705  *
 706  * Return true if we printed any log info messages
 707  */
 708 static int log_tree_diff(struct rev_info *opt, struct commit *commit, struct log_info *log)
 709 {
 710         int showed_log;
 711         struct commit_list *parents;
 712         unsigned const char *sha1 = commit->object.sha1;
 713
 714         if (!opt->diff && !DIFF_OPT_TST(&opt->diffopt, EXIT_WITH_STATUS))
 715                 return 0;
 716
 717         /* Root commit? */
 718         parents = commit->parents;
 719         if (!parents) {
 720                 if (opt->show_root_diff) {
 721                         diff_root_tree_sha1(sha1, "", &opt->diffopt);
 722                         log_tree_diff_flush(opt);
 723                 }
 724                 return !opt->loginfo;
 725         }
 726
 727         /* More than one parent? */
 728         if (parents && parents->next) {
 729                 if (opt->ignore_merges)
 730                         return 0;
 731                 else if (opt->combine_merges)
 732                         return do_diff_combined(opt, commit);
 733                 else if (opt->first_parent_only) {
 734                         /*
 735                          * Generate merge log entry only for the first
 736                          * parent, showing summary diff of the others
 737                          * we merged _in_.
 738                          */
 739                         diff_tree_sha1(parents->item->object.sha1, sha1, "", &opt->diffopt);
 740                         log_tree_diff_flush(opt);
 741                         return !opt->loginfo;
 742                 }
 743
 744                 /* If we show individual diffs, show the parent info */
 745                 log->parent = parents->item;
 746         }
 747
 748         showed_log = 0;
 749         for (;;) {
 750                 struct commit *parent = parents->item;
 751
 752                 diff_tree_sha1(parent->object.sha1, sha1, "", &opt->diffopt);
 753                 log_tree_diff_flush(opt);
 754
 755                 showed_log |= !opt->loginfo;
 756
 757                 /* Set up the log info for the next parent, if any.. */
 758                 parents = parents->next;
 759                 if (!parents)
 760                         break;
 761                 log->parent = parents->item;
 762                 opt->loginfo = log;
 763         }
 764         return showed_log;
 765 }
 766
 767 int log_tree_commit(struct rev_info *opt, struct commit *commit)
 768 {
 769         struct log_info log;
 770         int shown;
 771
 772         log.commit = commit;
 773         log.parent = NULL;
 774         opt->loginfo = &log;
 775
 776         shown = log_tree_diff(opt, commit, &log);
 777         if (!shown && opt->loginfo && opt->always_show_header) {
 778                 log.parent = NULL;
 779                 show_log(opt);
 780                 shown = 1;
 781         }
 782         opt->loginfo = NULL;
 783         maybe_flush_or_die(stdout, "stdout");
 784         return shown;
 785 }