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 #include "line-log.h"
  14
  15 struct decoration name_decoration = { "object names" };
  16
  17 enum decoration_type {
  18         DECORATION_NONE = 0,
  19         DECORATION_REF_LOCAL,
  20         DECORATION_REF_REMOTE,
  21         DECORATION_REF_TAG,
  22         DECORATION_REF_STASH,
  23         DECORATION_REF_HEAD,
  24         DECORATION_GRAFTED,
  25 };
  26
  27 static char decoration_colors[][COLOR_MAXLEN] = {
  28         GIT_COLOR_RESET,
  29         GIT_COLOR_BOLD_GREEN,   /* REF_LOCAL */
  30         GIT_COLOR_BOLD_RED,     /* REF_REMOTE */
  31         GIT_COLOR_BOLD_YELLOW,  /* REF_TAG */
  32         GIT_COLOR_BOLD_MAGENTA, /* REF_STASH */
  33         GIT_COLOR_BOLD_CYAN,    /* REF_HEAD */
  34         GIT_COLOR_BOLD_BLUE,    /* GRAFTED */
  35 };
  36
  37 static const char *decorate_get_color(int decorate_use_color, enum decoration_type ix)
  38 {
  39         if (want_color(decorate_use_color))
  40                 return decoration_colors[ix];
  41         return "";
  42 }
  43
  44 static int parse_decorate_color_slot(const char *slot)
  45 {
  46         /*
  47          * We're comparing with 'ignore-case' on
  48          * (because config.c sets them all tolower),
  49          * but let's match the letters in the literal
  50          * string values here with how they are
  51          * documented in Documentation/config.txt, for
  52          * consistency.
  53          *
  54          * We love being consistent, don't we?
  55          */
  56         if (!strcasecmp(slot, "branch"))
  57                 return DECORATION_REF_LOCAL;
  58         if (!strcasecmp(slot, "remoteBranch"))
  59                 return DECORATION_REF_REMOTE;
  60         if (!strcasecmp(slot, "tag"))
  61                 return DECORATION_REF_TAG;
  62         if (!strcasecmp(slot, "stash"))
  63                 return DECORATION_REF_STASH;
  64         if (!strcasecmp(slot, "HEAD"))
  65                 return DECORATION_REF_HEAD;
  66         return -1;
  67 }
  68
  69 int parse_decorate_color_config(const char *var, const int ofs, const char *value)
  70 {
  71         int slot = parse_decorate_color_slot(var + ofs);
  72         if (slot < 0)
  73                 return 0;
  74         if (!value)
  75                 return config_error_nonbool(var);
  76         color_parse(value, var, decoration_colors[slot]);
  77         return 0;
  78 }
  79
  80 /*
  81  * log-tree.c uses DIFF_OPT_TST for determining whether to use color
  82  * for showing the commit sha1, use the same check for --decorate
  83  */
  84 #define decorate_get_color_opt(o, ix) \
  85         decorate_get_color((o)->use_color, ix)
  86
  87 static void add_name_decoration(enum decoration_type type, const char *name, struct object *obj)
  88 {
  89         int nlen = strlen(name);
  90         struct name_decoration *res = xmalloc(sizeof(struct name_decoration) + nlen);
  91         memcpy(res->name, name, nlen + 1);
  92         res->type = type;
  93         res->next = add_decoration(&name_decoration, obj, res);
  94 }
  95
  96 static int add_ref_decoration(const char *refname, const unsigned char *sha1, int flags, void *cb_data)
  97 {
  98         struct object *obj;
  99         enum decoration_type type = DECORATION_NONE;
 100
 101         if (!prefixcmp(refname, "refs/replace/")) {
 102                 unsigned char original_sha1[20];
 103                 if (!read_replace_refs)
 104                         return 0;
 105                 if (get_sha1_hex(refname + 13, original_sha1)) {
 106                         warning("invalid replace ref %s", refname);
 107                         return 0;
 108                 }
 109                 obj = parse_object(original_sha1);
 110                 if (obj)
 111                         add_name_decoration(DECORATION_GRAFTED, "replaced", obj);
 112                 return 0;
 113         }
 114
 115         obj = parse_object(sha1);
 116         if (!obj)
 117                 return 0;
 118
 119         if (!prefixcmp(refname, "refs/heads/"))
 120                 type = DECORATION_REF_LOCAL;
 121         else if (!prefixcmp(refname, "refs/remotes/"))
 122                 type = DECORATION_REF_REMOTE;
 123         else if (!prefixcmp(refname, "refs/tags/"))
 124                 type = DECORATION_REF_TAG;
 125         else if (!strcmp(refname, "refs/stash"))
 126                 type = DECORATION_REF_STASH;
 127         else if (!strcmp(refname, "HEAD"))
 128                 type = DECORATION_REF_HEAD;
 129
 130         if (!cb_data || *(int *)cb_data == DECORATE_SHORT_REFS)
 131                 refname = prettify_refname(refname);
 132         add_name_decoration(type, refname, obj);
 133         while (obj->type == OBJ_TAG) {
 134                 obj = ((struct tag *)obj)->tagged;
 135                 if (!obj)
 136                         break;
 137                 if (!obj->parsed)
 138                         parse_object(obj->sha1);
 139                 add_name_decoration(DECORATION_REF_TAG, refname, obj);
 140         }
 141         return 0;
 142 }
 143
 144 static int add_graft_decoration(const struct commit_graft *graft, void *cb_data)
 145 {
 146         struct commit *commit = lookup_commit(graft->sha1);
 147         if (!commit)
 148                 return 0;
 149         add_name_decoration(DECORATION_GRAFTED, "grafted", &commit->object);
 150         return 0;
 151 }
 152
 153 void load_ref_decorations(int flags)
 154 {
 155         static int loaded;
 156         if (!loaded) {
 157                 loaded = 1;
 158                 for_each_ref(add_ref_decoration, &flags);
 159                 head_ref(add_ref_decoration, &flags);
 160                 for_each_commit_graft(add_graft_decoration, NULL);
 161         }
 162 }
 163
 164 static void show_parents(struct commit *commit, int abbrev)
 165 {
 166         struct commit_list *p;
 167         for (p = commit->parents; p ; p = p->next) {
 168                 struct commit *parent = p->item;
 169                 printf(" %s", find_unique_abbrev(parent->object.sha1, abbrev));
 170         }
 171 }
 172
 173 static void show_children(struct rev_info *opt, struct commit *commit, int abbrev)
 174 {
 175         struct commit_list *p = lookup_decoration(&opt->children, &commit->object);
 176         for ( ; p; p = p->next) {
 177                 printf(" %s", find_unique_abbrev(p->item->object.sha1, abbrev));
 178         }
 179 }
 180
 181 /*
 182  * The caller makes sure there is no funny color before
 183  * calling. format_decorations makes sure the same after return.
 184  */
 185 void format_decorations(struct strbuf *sb,
 186                         const struct commit *commit,
 187                         int use_color)
 188 {
 189         const char *prefix;
 190         struct name_decoration *decoration;
 191         const char *color_commit =
 192                 diff_get_color(use_color, DIFF_COMMIT);
 193         const char *color_reset =
 194                 decorate_get_color(use_color, DECORATION_NONE);
 195
 196         decoration = lookup_decoration(&name_decoration, &commit->object);
 197         if (!decoration)
 198                 return;
 199         prefix = " (";
 200         while (decoration) {
 201                 strbuf_addstr(sb, color_commit);
 202                 strbuf_addstr(sb, prefix);
 203                 strbuf_addstr(sb, decorate_get_color(use_color, decoration->type));
 204                 if (decoration->type == DECORATION_REF_TAG)
 205                         strbuf_addstr(sb, "tag: ");
 206                 strbuf_addstr(sb, decoration->name);
 207                 strbuf_addstr(sb, color_reset);
 208                 prefix = ", ";
 209                 decoration = decoration->next;
 210         }
 211         strbuf_addstr(sb, color_commit);
 212         strbuf_addch(sb, ')');
 213         strbuf_addstr(sb, color_reset);
 214 }
 215
 216 void show_decorations(struct rev_info *opt, struct commit *commit)
 217 {
 218         struct strbuf sb = STRBUF_INIT;
 219
 220         if (opt->show_source && commit->util)
 221                 printf("\t%s", (char *) commit->util);
 222         if (!opt->show_decorations)
 223                 return;
 224         format_decorations(&sb, commit, opt->diffopt.use_color);
 225         fputs(sb.buf, stdout);
 226         strbuf_release(&sb);
 227 }
 228
 229 static unsigned int digits_in_number(unsigned int number)
 230 {
 231         unsigned int i = 10, result = 1;
 232         while (i <= number) {
 233                 i *= 10;
 234                 result++;
 235         }
 236         return result;
 237 }
 238
 239 void fmt_output_subject(struct strbuf *filename,
 240                         const char *subject,
 241                         struct rev_info *info)
 242 {
 243         const char *suffix = info->patch_suffix;
 244         int nr = info->nr;
 245         int start_len = filename->len;
 246         int max_len = start_len + FORMAT_PATCH_NAME_MAX - (strlen(suffix) + 1);
 247
 248         if (0 < info->reroll_count)
 249                 strbuf_addf(filename, "v%d-", info->reroll_count);
 250         strbuf_addf(filename, "%04d-%s", nr, subject);
 251
 252         if (max_len < filename->len)
 253                 strbuf_setlen(filename, max_len);
 254         strbuf_addstr(filename, suffix);
 255 }
 256
 257 void fmt_output_commit(struct strbuf *filename,
 258                        struct commit *commit,
 259                        struct rev_info *info)
 260 {
 261         struct pretty_print_context ctx = {0};
 262         struct strbuf subject = STRBUF_INIT;
 263
 264         format_commit_message(commit, "%f", &subject, &ctx);
 265         fmt_output_subject(filename, subject.buf, info);
 266         strbuf_release(&subject);
 267 }
 268
 269 void log_write_email_headers(struct rev_info *opt, struct commit *commit,
 270                              const char **subject_p,
 271                              const char **extra_headers_p,
 272                              int *need_8bit_cte_p)
 273 {
 274         const char *subject = NULL;
 275         const char *extra_headers = opt->extra_headers;
 276         const char *name = sha1_to_hex(commit->object.sha1);
 277
 278         *need_8bit_cte_p = 0; /* unknown */
 279         if (opt->total > 0) {
 280                 static char buffer[64];
 281                 snprintf(buffer, sizeof(buffer),
 282                          "Subject: [%s%s%0*d/%d] ",
 283                          opt->subject_prefix,
 284                          *opt->subject_prefix ? " " : "",
 285                          digits_in_number(opt->total),
 286                          opt->nr, opt->total);
 287                 subject = buffer;
 288         } else if (opt->total == 0 && opt->subject_prefix && *opt->subject_prefix) {
 289                 static char buffer[256];
 290                 snprintf(buffer, sizeof(buffer),
 291                          "Subject: [%s] ",
 292                          opt->subject_prefix);
 293                 subject = buffer;
 294         } else {
 295                 subject = "Subject: ";
 296         }
 297
 298         printf("From %s Mon Sep 17 00:00:00 2001\n", name);
 299         graph_show_oneline(opt->graph);
 300         if (opt->message_id) {
 301                 printf("Message-Id: <%s>\n", opt->message_id);
 302                 graph_show_oneline(opt->graph);
 303         }
 304         if (opt->ref_message_ids && opt->ref_message_ids->nr > 0) {
 305                 int i, n;
 306                 n = opt->ref_message_ids->nr;
 307                 printf("In-Reply-To: <%s>\n", opt->ref_message_ids->items[n-1].string);
 308                 for (i = 0; i < n; i++)
 309                         printf("%s<%s>\n", (i > 0 ? "\t" : "References: "),
 310                                opt->ref_message_ids->items[i].string);
 311                 graph_show_oneline(opt->graph);
 312         }
 313         if (opt->mime_boundary) {
 314                 static char subject_buffer[1024];
 315                 static char buffer[1024];
 316                 struct strbuf filename =  STRBUF_INIT;
 317                 *need_8bit_cte_p = -1; /* NEVER */
 318                 snprintf(subject_buffer, sizeof(subject_buffer) - 1,
 319                          "%s"
 320                          "MIME-Version: 1.0\n"
 321                          "Content-Type: multipart/mixed;"
 322                          " boundary=\"%s%s\"\n"
 323                          "\n"
 324                          "This is a multi-part message in MIME "
 325                          "format.\n"
 326                          "--%s%s\n"
 327                          "Content-Type: text/plain; "
 328                          "charset=UTF-8; format=fixed\n"
 329                          "Content-Transfer-Encoding: 8bit\n\n",
 330                          extra_headers ? extra_headers : "",
 331                          mime_boundary_leader, opt->mime_boundary,
 332                          mime_boundary_leader, opt->mime_boundary);
 333                 extra_headers = subject_buffer;
 334
 335                 if (opt->numbered_files)
 336                         strbuf_addf(&filename, "%d", opt->nr);
 337                 else
 338                         fmt_output_commit(&filename, commit, opt);
 339                 snprintf(buffer, sizeof(buffer) - 1,
 340                          "\n--%s%s\n"
 341                          "Content-Type: text/x-patch;"
 342                          " name=\"%s\"\n"
 343                          "Content-Transfer-Encoding: 8bit\n"
 344                          "Content-Disposition: %s;"
 345                          " filename=\"%s\"\n\n",
 346                          mime_boundary_leader, opt->mime_boundary,
 347                          filename.buf,
 348                          opt->no_inline ? "attachment" : "inline",
 349                          filename.buf);
 350                 opt->diffopt.stat_sep = buffer;
 351                 strbuf_release(&filename);
 352         }
 353         *subject_p = subject;
 354         *extra_headers_p = extra_headers;
 355 }
 356
 357 static void show_sig_lines(struct rev_info *opt, int status, const char *bol)
 358 {
 359         const char *color, *reset, *eol;
 360
 361         color = diff_get_color_opt(&opt->diffopt,
 362                                    status ? DIFF_WHITESPACE : DIFF_FRAGINFO);
 363         reset = diff_get_color_opt(&opt->diffopt, DIFF_RESET);
 364         while (*bol) {
 365                 eol = strchrnul(bol, '\n');
 366                 printf("%s%.*s%s%s", color, (int)(eol - bol), bol, reset,
 367                        *eol ? "\n" : "");
 368                 bol = (*eol) ? (eol + 1) : eol;
 369         }
 370 }
 371
 372 static void show_signature(struct rev_info *opt, struct commit *commit)
 373 {
 374         struct strbuf payload = STRBUF_INIT;
 375         struct strbuf signature = STRBUF_INIT;
 376         struct strbuf gpg_output = STRBUF_INIT;
 377         int status;
 378
 379         if (parse_signed_commit(commit->object.sha1, &payload, &signature) <= 0)
 380                 goto out;
 381
 382         status = verify_signed_buffer(payload.buf, payload.len,
 383                                       signature.buf, signature.len,
 384                                       &gpg_output, NULL);
 385         if (status && !gpg_output.len)
 386                 strbuf_addstr(&gpg_output, "No signature\n");
 387
 388         show_sig_lines(opt, status, gpg_output.buf);
 389
 390  out:
 391         strbuf_release(&gpg_output);
 392         strbuf_release(&payload);
 393         strbuf_release(&signature);
 394 }
 395
 396 static int which_parent(const unsigned char *sha1, const struct commit *commit)
 397 {
 398         int nth;
 399         const struct commit_list *parent;
 400
 401         for (nth = 0, parent = commit->parents; parent; parent = parent->next) {
 402                 if (!hashcmp(parent->item->object.sha1, sha1))
 403                         return nth;
 404                 nth++;
 405         }
 406         return -1;
 407 }
 408
 409 static int is_common_merge(const struct commit *commit)
 410 {
 411         return (commit->parents
 412                 && commit->parents->next
 413                 && !commit->parents->next->next);
 414 }
 415
 416 static void show_one_mergetag(struct rev_info *opt,
 417                               struct commit_extra_header *extra,
 418                               struct commit *commit)
 419 {
 420         unsigned char sha1[20];
 421         struct tag *tag;
 422         struct strbuf verify_message;
 423         int status, nth;
 424         size_t payload_size, gpg_message_offset;
 425
 426         hash_sha1_file(extra->value, extra->len, typename(OBJ_TAG), sha1);
 427         tag = lookup_tag(sha1);
 428         if (!tag)
 429                 return; /* error message already given */
 430
 431         strbuf_init(&verify_message, 256);
 432         if (parse_tag_buffer(tag, extra->value, extra->len))
 433                 strbuf_addstr(&verify_message, "malformed mergetag\n");
 434         else if (is_common_merge(commit) &&
 435                  !hashcmp(tag->tagged->sha1,
 436                           commit->parents->next->item->object.sha1))
 437                 strbuf_addf(&verify_message,
 438                             "merged tag '%s'\n", tag->tag);
 439         else if ((nth = which_parent(tag->tagged->sha1, commit)) < 0)
 440                 strbuf_addf(&verify_message, "tag %s names a non-parent %s\n",
 441                                     tag->tag, tag->tagged->sha1);
 442         else
 443                 strbuf_addf(&verify_message,
 444                             "parent #%d, tagged '%s'\n", nth + 1, tag->tag);
 445         gpg_message_offset = verify_message.len;
 446
 447         payload_size = parse_signature(extra->value, extra->len);
 448         status = -1;
 449         if (extra->len > payload_size)
 450                 if (verify_signed_buffer(extra->value, payload_size,
 451                                          extra->value + payload_size,
 452                                          extra->len - payload_size,
 453                                          &verify_message, NULL)) {
 454                         if (verify_message.len <= gpg_message_offset)
 455                                 strbuf_addstr(&verify_message, "No signature\n");
 456                         else
 457                                 status = 0;
 458                 }
 459
 460         show_sig_lines(opt, status, verify_message.buf);
 461         strbuf_release(&verify_message);
 462 }
 463
 464 static void show_mergetag(struct rev_info *opt, struct commit *commit)
 465 {
 466         struct commit_extra_header *extra, *to_free;
 467
 468         to_free = read_commit_extra_headers(commit, NULL);
 469         for (extra = to_free; extra; extra = extra->next) {
 470                 if (strcmp(extra->key, "mergetag"))
 471                         continue; /* not a merge tag */
 472                 show_one_mergetag(opt, extra, commit);
 473         }
 474         free_commit_extra_headers(to_free);
 475 }
 476
 477 void show_log(struct rev_info *opt)
 478 {
 479         struct strbuf msgbuf = STRBUF_INIT;
 480         struct log_info *log = opt->loginfo;
 481         struct commit *commit = log->commit, *parent = log->parent;
 482         int abbrev_commit = opt->abbrev_commit ? opt->abbrev : 40;
 483         const char *extra_headers = opt->extra_headers;
 484         struct pretty_print_context ctx = {0};
 485
 486         opt->loginfo = NULL;
 487         if (!opt->verbose_header) {
 488                 graph_show_commit(opt->graph);
 489
 490                 if (!opt->graph)
 491                         put_revision_mark(opt, commit);
 492                 fputs(find_unique_abbrev(commit->object.sha1, abbrev_commit), stdout);
 493                 if (opt->print_parents)
 494                         show_parents(commit, abbrev_commit);
 495                 if (opt->children.name)
 496                         show_children(opt, commit, abbrev_commit);
 497                 show_decorations(opt, commit);
 498                 if (opt->graph && !graph_is_commit_finished(opt->graph)) {
 499                         putchar('\n');
 500                         graph_show_remainder(opt->graph);
 501                 }
 502                 putchar(opt->diffopt.line_termination);
 503                 return;
 504         }
 505
 506         /*
 507          * If use_terminator is set, we already handled any record termination
 508          * at the end of the last record.
 509          * Otherwise, add a diffopt.line_termination character before all
 510          * entries but the first.  (IOW, as a separator between entries)
 511          */
 512         if (opt->shown_one && !opt->use_terminator) {
 513                 /*
 514                  * If entries are separated by a newline, the output
 515                  * should look human-readable.  If the last entry ended
 516                  * with a newline, print the graph output before this
 517                  * newline.  Otherwise it will end up as a completely blank
 518                  * line and will look like a gap in the graph.
 519                  *
 520                  * If the entry separator is not a newline, the output is
 521                  * primarily intended for programmatic consumption, and we
 522                  * never want the extra graph output before the entry
 523                  * separator.
 524                  */
 525                 if (opt->diffopt.line_termination == '\n' &&
 526                     !opt->missing_newline)
 527                         graph_show_padding(opt->graph);
 528                 putchar(opt->diffopt.line_termination);
 529         }
 530         opt->shown_one = 1;
 531
 532         /*
 533          * If the history graph was requested,
 534          * print the graph, up to this commit's line
 535          */
 536         graph_show_commit(opt->graph);
 537
 538         /*
 539          * Print header line of header..
 540          */
 541
 542         if (opt->commit_format == CMIT_FMT_EMAIL) {
 543                 log_write_email_headers(opt, commit, &ctx.subject, &extra_headers,
 544                                         &ctx.need_8bit_cte);
 545         } else if (opt->commit_format != CMIT_FMT_USERFORMAT) {
 546                 fputs(diff_get_color_opt(&opt->diffopt, DIFF_COMMIT), stdout);
 547                 if (opt->commit_format != CMIT_FMT_ONELINE)
 548                         fputs("commit ", stdout);
 549
 550                 if (!opt->graph)
 551                         put_revision_mark(opt, commit);
 552                 fputs(find_unique_abbrev(commit->object.sha1, abbrev_commit),
 553                       stdout);
 554                 if (opt->print_parents)
 555                         show_parents(commit, abbrev_commit);
 556                 if (opt->children.name)
 557                         show_children(opt, commit, abbrev_commit);
 558                 if (parent)
 559                         printf(" (from %s)",
 560                                find_unique_abbrev(parent->object.sha1,
 561                                                   abbrev_commit));
 562                 fputs(diff_get_color_opt(&opt->diffopt, DIFF_RESET), stdout);
 563                 show_decorations(opt, commit);
 564                 if (opt->commit_format == CMIT_FMT_ONELINE) {
 565                         putchar(' ');
 566                 } else {
 567                         putchar('\n');
 568                         graph_show_oneline(opt->graph);
 569                 }
 570                 if (opt->reflog_info) {
 571                         /*
 572                          * setup_revisions() ensures that opt->reflog_info
 573                          * and opt->graph cannot both be set,
 574                          * so we don't need to worry about printing the
 575                          * graph info here.
 576                          */
 577                         show_reflog_message(opt->reflog_info,
 578                                             opt->commit_format == CMIT_FMT_ONELINE,
 579                                             opt->date_mode,
 580                                             opt->date_mode_explicit);
 581                         if (opt->commit_format == CMIT_FMT_ONELINE)
 582                                 return;
 583                 }
 584         }
 585
 586         if (opt->show_signature) {
 587                 show_signature(opt, commit);
 588                 show_mergetag(opt, commit);
 589         }
 590
 591         if (!commit->buffer)
 592                 return;
 593
 594         if (opt->show_notes) {
 595                 int raw;
 596                 struct strbuf notebuf = STRBUF_INIT;
 597
 598                 raw = (opt->commit_format == CMIT_FMT_USERFORMAT);
 599                 format_display_notes(commit->object.sha1, &notebuf,
 600                                      get_log_output_encoding(), raw);
 601                 ctx.notes_message = notebuf.len
 602                         ? strbuf_detach(&notebuf, NULL)
 603                         : xcalloc(1, 1);
 604         }
 605
 606         /*
 607          * And then the pretty-printed message itself
 608          */
 609         if (ctx.need_8bit_cte >= 0 && opt->add_signoff)
 610                 ctx.need_8bit_cte =
 611                         has_non_ascii(fmt_name(getenv("GIT_COMMITTER_NAME"),
 612                                                getenv("GIT_COMMITTER_EMAIL")));
 613         ctx.date_mode = opt->date_mode;
 614         ctx.date_mode_explicit = opt->date_mode_explicit;
 615         ctx.abbrev = opt->diffopt.abbrev;
 616         ctx.after_subject = extra_headers;
 617         ctx.preserve_subject = opt->preserve_subject;
 618         ctx.reflog_info = opt->reflog_info;
 619         ctx.fmt = opt->commit_format;
 620         ctx.mailmap = opt->mailmap;
 621         ctx.color = opt->diffopt.use_color;
 622         ctx.output_encoding = get_log_output_encoding();
 623         if (opt->from_ident.mail_begin && opt->from_ident.name_begin)
 624                 ctx.from_ident = &opt->from_ident;
 625         pretty_print_commit(&ctx, commit, &msgbuf);
 626
 627         if (opt->add_signoff)
 628                 append_signoff(&msgbuf, 0, APPEND_SIGNOFF_DEDUP);
 629
 630         if ((ctx.fmt != CMIT_FMT_USERFORMAT) &&
 631             ctx.notes_message && *ctx.notes_message) {
 632                 if (ctx.fmt == CMIT_FMT_EMAIL) {
 633                         strbuf_addstr(&msgbuf, "---\n");
 634                         opt->shown_dashes = 1;
 635                 }
 636                 strbuf_addstr(&msgbuf, ctx.notes_message);
 637         }
 638
 639         if (opt->show_log_size) {
 640                 printf("log size %i\n", (int)msgbuf.len);
 641                 graph_show_oneline(opt->graph);
 642         }
 643
 644         /*
 645          * Set opt->missing_newline if msgbuf doesn't
 646          * end in a newline (including if it is empty)
 647          */
 648         if (!msgbuf.len || msgbuf.buf[msgbuf.len - 1] != '\n')
 649                 opt->missing_newline = 1;
 650         else
 651                 opt->missing_newline = 0;
 652
 653         if (opt->graph)
 654                 graph_show_commit_msg(opt->graph, &msgbuf);
 655         else
 656                 fwrite(msgbuf.buf, sizeof(char), msgbuf.len, stdout);
 657         if (opt->use_terminator) {
 658                 if (!opt->missing_newline)
 659                         graph_show_padding(opt->graph);
 660                 putchar(opt->diffopt.line_termination);
 661         }
 662
 663         strbuf_release(&msgbuf);
 664         free(ctx.notes_message);
 665 }
 666
 667 int log_tree_diff_flush(struct rev_info *opt)
 668 {
 669         opt->shown_dashes = 0;
 670         diffcore_std(&opt->diffopt);
 671
 672         if (diff_queue_is_empty()) {
 673                 int saved_fmt = opt->diffopt.output_format;
 674                 opt->diffopt.output_format = DIFF_FORMAT_NO_OUTPUT;
 675                 diff_flush(&opt->diffopt);
 676                 opt->diffopt.output_format = saved_fmt;
 677                 return 0;
 678         }
 679
 680         if (opt->loginfo && !opt->no_commit_id) {
 681                 show_log(opt);
 682                 if ((opt->diffopt.output_format & ~DIFF_FORMAT_NO_OUTPUT) &&
 683                     opt->verbose_header &&
 684                     opt->commit_format != CMIT_FMT_ONELINE) {
 685                         /*
 686                          * When showing a verbose header (i.e. log message),
 687                          * and not in --pretty=oneline format, we would want
 688                          * an extra newline between the end of log and the
 689                          * diff/diffstat output for readability.
 690                          */
 691                         int pch = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_PATCH;
 692                         if (opt->diffopt.output_prefix) {
 693                                 struct strbuf *msg = NULL;
 694                                 msg = opt->diffopt.output_prefix(&opt->diffopt,
 695                                         opt->diffopt.output_prefix_data);
 696                                 fwrite(msg->buf, msg->len, 1, stdout);
 697                         }
 698
 699                         /*
 700                          * We may have shown three-dashes line early
 701                          * between notes and the log message, in which
 702                          * case we only want a blank line after the
 703                          * notes without (an extra) three-dashes line.
 704                          * Otherwise, we show the three-dashes line if
 705                          * we are showing the patch with diffstat, but
 706                          * in that case, there is no extra blank line
 707                          * after the three-dashes line.
 708                          */
 709                         if (!opt->shown_dashes &&
 710                             (pch & opt->diffopt.output_format) == pch)
 711                                 printf("---");
 712                         putchar('\n');
 713                 }
 714         }
 715         diff_flush(&opt->diffopt);
 716         return 1;
 717 }
 718
 719 static int do_diff_combined(struct rev_info *opt, struct commit *commit)
 720 {
 721         diff_tree_combined_merge(commit, opt->dense_combined_merges, opt);
 722         return !opt->loginfo;
 723 }
 724
 725 /*
 726  * Show the diff of a commit.
 727  *
 728  * Return true if we printed any log info messages
 729  */
 730 static int log_tree_diff(struct rev_info *opt, struct commit *commit, struct log_info *log)
 731 {
 732         int showed_log;
 733         struct commit_list *parents;
 734         unsigned const char *sha1;
 735
 736         if (!opt->diff && !DIFF_OPT_TST(&opt->diffopt, EXIT_WITH_STATUS))
 737                 return 0;
 738
 739         parse_commit(commit);
 740         sha1 = commit->tree->object.sha1;
 741
 742         /* Root commit? */
 743         parents = get_saved_parents(opt, commit);
 744         if (!parents) {
 745                 if (opt->show_root_diff) {
 746                         diff_root_tree_sha1(sha1, "", &opt->diffopt);
 747                         log_tree_diff_flush(opt);
 748                 }
 749                 return !opt->loginfo;
 750         }
 751
 752         /* More than one parent? */
 753         if (parents && parents->next) {
 754                 if (opt->ignore_merges)
 755                         return 0;
 756                 else if (opt->combine_merges)
 757                         return do_diff_combined(opt, commit);
 758                 else if (opt->first_parent_only) {
 759                         /*
 760                          * Generate merge log entry only for the first
 761                          * parent, showing summary diff of the others
 762                          * we merged _in_.
 763                          */
 764                         parse_commit(parents->item);
 765                         diff_tree_sha1(parents->item->tree->object.sha1,
 766                                        sha1, "", &opt->diffopt);
 767                         log_tree_diff_flush(opt);
 768                         return !opt->loginfo;
 769                 }
 770
 771                 /* If we show individual diffs, show the parent info */
 772                 log->parent = parents->item;
 773         }
 774
 775         showed_log = 0;
 776         for (;;) {
 777                 struct commit *parent = parents->item;
 778
 779                 parse_commit(parent);
 780                 diff_tree_sha1(parent->tree->object.sha1,
 781                                sha1, "", &opt->diffopt);
 782                 log_tree_diff_flush(opt);
 783
 784                 showed_log |= !opt->loginfo;
 785
 786                 /* Set up the log info for the next parent, if any.. */
 787                 parents = parents->next;
 788                 if (!parents)
 789                         break;
 790                 log->parent = parents->item;
 791                 opt->loginfo = log;
 792         }
 793         return showed_log;
 794 }
 795
 796 int log_tree_commit(struct rev_info *opt, struct commit *commit)
 797 {
 798         struct log_info log;
 799         int shown;
 800
 801         log.commit = commit;
 802         log.parent = NULL;
 803         opt->loginfo = &log;
 804
 805         if (opt->line_level_traverse)
 806                 return line_log_print(opt, commit);
 807
 808         shown = log_tree_diff(opt, commit, &log);
 809         if (!shown && opt->loginfo && opt->always_show_header) {
 810                 log.parent = NULL;
 811                 show_log(opt);
 812                 shown = 1;
 813         }
 814         opt->loginfo = NULL;
 815         maybe_flush_or_die(stdout, "stdout");
 816         return shown;
 817 }