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