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 (starts_with(refname, "refs/replace/")) {
 102                 unsigned char original_sha1[20];
 103                 if (!check_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 (starts_with(refname, "refs/heads/"))
 120                 type = DECORATION_REF_LOCAL;
 121         else if (starts_with(refname, "refs/remotes/"))
 122                 type = DECORATION_REF_REMOTE;
 123         else if (starts_with(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                 graph_show_oneline(opt->graph);
 369                 bol = (*eol) ? (eol + 1) : eol;
 370         }
 371 }
 372
 373 static void show_signature(struct rev_info *opt, struct commit *commit)
 374 {
 375         struct strbuf payload = STRBUF_INIT;
 376         struct strbuf signature = STRBUF_INIT;
 377         struct strbuf gpg_output = STRBUF_INIT;
 378         int status;
 379
 380         if (parse_signed_commit(commit, &payload, &signature) <= 0)
 381                 goto out;
 382
 383         status = verify_signed_buffer(payload.buf, payload.len,
 384                                       signature.buf, signature.len,
 385                                       &gpg_output, NULL);
 386         if (status && !gpg_output.len)
 387                 strbuf_addstr(&gpg_output, "No signature\n");
 388
 389         show_sig_lines(opt, status, gpg_output.buf);
 390
 391  out:
 392         strbuf_release(&gpg_output);
 393         strbuf_release(&payload);
 394         strbuf_release(&signature);
 395 }
 396
 397 static int which_parent(const unsigned char *sha1, const struct commit *commit)
 398 {
 399         int nth;
 400         const struct commit_list *parent;
 401
 402         for (nth = 0, parent = commit->parents; parent; parent = parent->next) {
 403                 if (!hashcmp(parent->item->object.sha1, sha1))
 404                         return nth;
 405                 nth++;
 406         }
 407         return -1;
 408 }
 409
 410 static int is_common_merge(const struct commit *commit)
 411 {
 412         return (commit->parents
 413                 && commit->parents->next
 414                 && !commit->parents->next->next);
 415 }
 416
 417 static void show_one_mergetag(struct rev_info *opt,
 418                               struct commit_extra_header *extra,
 419                               struct commit *commit)
 420 {
 421         unsigned char sha1[20];
 422         struct tag *tag;
 423         struct strbuf verify_message;
 424         int status, nth;
 425         size_t payload_size, gpg_message_offset;
 426
 427         hash_sha1_file(extra->value, extra->len, typename(OBJ_TAG), sha1);
 428         tag = lookup_tag(sha1);
 429         if (!tag)
 430                 return; /* error message already given */
 431
 432         strbuf_init(&verify_message, 256);
 433         if (parse_tag_buffer(tag, extra->value, extra->len))
 434                 strbuf_addstr(&verify_message, "malformed mergetag\n");
 435         else if (is_common_merge(commit) &&
 436                  !hashcmp(tag->tagged->sha1,
 437                           commit->parents->next->item->object.sha1))
 438                 strbuf_addf(&verify_message,
 439                             "merged tag '%s'\n", tag->tag);
 440         else if ((nth = which_parent(tag->tagged->sha1, commit)) < 0)
 441                 strbuf_addf(&verify_message, "tag %s names a non-parent %s\n",
 442                                     tag->tag, tag->tagged->sha1);
 443         else
 444                 strbuf_addf(&verify_message,
 445                             "parent #%d, tagged '%s'\n", nth + 1, tag->tag);
 446         gpg_message_offset = verify_message.len;
 447
 448         payload_size = parse_signature(extra->value, extra->len);
 449         status = -1;
 450         if (extra->len > payload_size) {
 451                 /* could have a good signature */
 452                 if (!verify_signed_buffer(extra->value, payload_size,
 453                                           extra->value + payload_size,
 454                                           extra->len - payload_size,
 455                                           &verify_message, NULL))
 456                         status = 0; /* good */
 457                 else if (verify_message.len <= gpg_message_offset)
 458                         strbuf_addstr(&verify_message, "No signature\n");
 459                 /* otherwise we couldn't verify, which is shown as bad */
 460         }
 461
 462         show_sig_lines(opt, status, verify_message.buf);
 463         strbuf_release(&verify_message);
 464 }
 465
 466 static void show_mergetag(struct rev_info *opt, struct commit *commit)
 467 {
 468         struct commit_extra_header *extra, *to_free;
 469
 470         to_free = read_commit_extra_headers(commit, NULL);
 471         for (extra = to_free; extra; extra = extra->next) {
 472                 if (strcmp(extra->key, "mergetag"))
 473                         continue; /* not a merge tag */
 474                 show_one_mergetag(opt, extra, commit);
 475         }
 476         free_commit_extra_headers(to_free);
 477 }
 478
 479 void show_log(struct rev_info *opt)
 480 {
 481         struct strbuf msgbuf = STRBUF_INIT;
 482         struct log_info *log = opt->loginfo;
 483         struct commit *commit = log->commit, *parent = log->parent;
 484         int abbrev_commit = opt->abbrev_commit ? opt->abbrev : 40;
 485         const char *extra_headers = opt->extra_headers;
 486         struct pretty_print_context ctx = {0};
 487
 488         opt->loginfo = NULL;
 489         if (!opt->verbose_header) {
 490                 graph_show_commit(opt->graph);
 491
 492                 if (!opt->graph)
 493                         put_revision_mark(opt, commit);
 494                 fputs(find_unique_abbrev(commit->object.sha1, abbrev_commit), stdout);
 495                 if (opt->print_parents)
 496                         show_parents(commit, abbrev_commit);
 497                 if (opt->children.name)
 498                         show_children(opt, commit, abbrev_commit);
 499                 show_decorations(opt, commit);
 500                 if (opt->graph && !graph_is_commit_finished(opt->graph)) {
 501                         putchar('\n');
 502                         graph_show_remainder(opt->graph);
 503                 }
 504                 putchar(opt->diffopt.line_termination);
 505                 return;
 506         }
 507
 508         /*
 509          * If use_terminator is set, we already handled any record termination
 510          * at the end of the last record.
 511          * Otherwise, add a diffopt.line_termination character before all
 512          * entries but the first.  (IOW, as a separator between entries)
 513          */
 514         if (opt->shown_one && !opt->use_terminator) {
 515                 /*
 516                  * If entries are separated by a newline, the output
 517                  * should look human-readable.  If the last entry ended
 518                  * with a newline, print the graph output before this
 519                  * newline.  Otherwise it will end up as a completely blank
 520                  * line and will look like a gap in the graph.
 521                  *
 522                  * If the entry separator is not a newline, the output is
 523                  * primarily intended for programmatic consumption, and we
 524                  * never want the extra graph output before the entry
 525                  * separator.
 526                  */
 527                 if (opt->diffopt.line_termination == '\n' &&
 528                     !opt->missing_newline)
 529                         graph_show_padding(opt->graph);
 530                 putchar(opt->diffopt.line_termination);
 531         }
 532         opt->shown_one = 1;
 533
 534         /*
 535          * If the history graph was requested,
 536          * print the graph, up to this commit's line
 537          */
 538         graph_show_commit(opt->graph);
 539
 540         /*
 541          * Print header line of header..
 542          */
 543
 544         if (opt->commit_format == CMIT_FMT_EMAIL) {
 545                 log_write_email_headers(opt, commit, &ctx.subject, &extra_headers,
 546                                         &ctx.need_8bit_cte);
 547         } else if (opt->commit_format != CMIT_FMT_USERFORMAT) {
 548                 fputs(diff_get_color_opt(&opt->diffopt, DIFF_COMMIT), stdout);
 549                 if (opt->commit_format != CMIT_FMT_ONELINE)
 550                         fputs("commit ", stdout);
 551
 552                 if (!opt->graph)
 553                         put_revision_mark(opt, commit);
 554                 fputs(find_unique_abbrev(commit->object.sha1, abbrev_commit),
 555                       stdout);
 556                 if (opt->print_parents)
 557                         show_parents(commit, abbrev_commit);
 558                 if (opt->children.name)
 559                         show_children(opt, commit, abbrev_commit);
 560                 if (parent)
 561                         printf(" (from %s)",
 562                                find_unique_abbrev(parent->object.sha1,
 563                                                   abbrev_commit));
 564                 fputs(diff_get_color_opt(&opt->diffopt, DIFF_RESET), stdout);
 565                 show_decorations(opt, commit);
 566                 if (opt->commit_format == CMIT_FMT_ONELINE) {
 567                         putchar(' ');
 568                 } else {
 569                         putchar('\n');
 570                         graph_show_oneline(opt->graph);
 571                 }
 572                 if (opt->reflog_info) {
 573                         /*
 574                          * setup_revisions() ensures that opt->reflog_info
 575                          * and opt->graph cannot both be set,
 576                          * so we don't need to worry about printing the
 577                          * graph info here.
 578                          */
 579                         show_reflog_message(opt->reflog_info,
 580                                             opt->commit_format == CMIT_FMT_ONELINE,
 581                                             opt->date_mode,
 582                                             opt->date_mode_explicit);
 583                         if (opt->commit_format == CMIT_FMT_ONELINE)
 584                                 return;
 585                 }
 586         }
 587
 588         if (opt->show_signature) {
 589                 show_signature(opt, commit);
 590                 show_mergetag(opt, commit);
 591         }
 592
 593         if (!get_cached_commit_buffer(commit, NULL))
 594                 return;
 595
 596         if (opt->show_notes) {
 597                 int raw;
 598                 struct strbuf notebuf = STRBUF_INIT;
 599
 600                 raw = (opt->commit_format == CMIT_FMT_USERFORMAT);
 601                 format_display_notes(commit->object.sha1, &notebuf,
 602                                      get_log_output_encoding(), raw);
 603                 ctx.notes_message = notebuf.len
 604                         ? strbuf_detach(&notebuf, NULL)
 605                         : xcalloc(1, 1);
 606         }
 607
 608         /*
 609          * And then the pretty-printed message itself
 610          */
 611         if (ctx.need_8bit_cte >= 0 && opt->add_signoff)
 612                 ctx.need_8bit_cte =
 613                         has_non_ascii(fmt_name(getenv("GIT_COMMITTER_NAME"),
 614                                                getenv("GIT_COMMITTER_EMAIL")));
 615         ctx.date_mode = opt->date_mode;
 616         ctx.date_mode_explicit = opt->date_mode_explicit;
 617         ctx.abbrev = opt->diffopt.abbrev;
 618         ctx.after_subject = extra_headers;
 619         ctx.preserve_subject = opt->preserve_subject;
 620         ctx.reflog_info = opt->reflog_info;
 621         ctx.fmt = opt->commit_format;
 622         ctx.mailmap = opt->mailmap;
 623         ctx.color = opt->diffopt.use_color;
 624         ctx.output_encoding = get_log_output_encoding();
 625         if (opt->from_ident.mail_begin && opt->from_ident.name_begin)
 626                 ctx.from_ident = &opt->from_ident;
 627         pretty_print_commit(&ctx, commit, &msgbuf);
 628
 629         if (opt->add_signoff)
 630                 append_signoff(&msgbuf, 0, APPEND_SIGNOFF_DEDUP);
 631
 632         if ((ctx.fmt != CMIT_FMT_USERFORMAT) &&
 633             ctx.notes_message && *ctx.notes_message) {
 634                 if (ctx.fmt == CMIT_FMT_EMAIL) {
 635                         strbuf_addstr(&msgbuf, "---\n");
 636                         opt->shown_dashes = 1;
 637                 }
 638                 strbuf_addstr(&msgbuf, ctx.notes_message);
 639         }
 640
 641         if (opt->show_log_size) {
 642                 printf("log size %i\n", (int)msgbuf.len);
 643                 graph_show_oneline(opt->graph);
 644         }
 645
 646         /*
 647          * Set opt->missing_newline if msgbuf doesn't
 648          * end in a newline (including if it is empty)
 649          */
 650         if (!msgbuf.len || msgbuf.buf[msgbuf.len - 1] != '\n')
 651                 opt->missing_newline = 1;
 652         else
 653                 opt->missing_newline = 0;
 654
 655         if (opt->graph)
 656                 graph_show_commit_msg(opt->graph, &msgbuf);
 657         else
 658                 fwrite(msgbuf.buf, sizeof(char), msgbuf.len, stdout);
 659         if (opt->use_terminator) {
 660                 if (!opt->missing_newline)
 661                         graph_show_padding(opt->graph);
 662                 putchar(opt->diffopt.line_termination);
 663         }
 664
 665         strbuf_release(&msgbuf);
 666         free(ctx.notes_message);
 667 }
 668
 669 int log_tree_diff_flush(struct rev_info *opt)
 670 {
 671         opt->shown_dashes = 0;
 672         diffcore_std(&opt->diffopt);
 673
 674         if (diff_queue_is_empty()) {
 675                 int saved_fmt = opt->diffopt.output_format;
 676                 opt->diffopt.output_format = DIFF_FORMAT_NO_OUTPUT;
 677                 diff_flush(&opt->diffopt);
 678                 opt->diffopt.output_format = saved_fmt;
 679                 return 0;
 680         }
 681
 682         if (opt->loginfo && !opt->no_commit_id) {
 683                 show_log(opt);
 684                 if ((opt->diffopt.output_format & ~DIFF_FORMAT_NO_OUTPUT) &&
 685                     opt->verbose_header &&
 686                     opt->commit_format != CMIT_FMT_ONELINE) {
 687                         /*
 688                          * When showing a verbose header (i.e. log message),
 689                          * and not in --pretty=oneline format, we would want
 690                          * an extra newline between the end of log and the
 691                          * diff/diffstat output for readability.
 692                          */
 693                         int pch = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_PATCH;
 694                         if (opt->diffopt.output_prefix) {
 695                                 struct strbuf *msg = NULL;
 696                                 msg = opt->diffopt.output_prefix(&opt->diffopt,
 697                                         opt->diffopt.output_prefix_data);
 698                                 fwrite(msg->buf, msg->len, 1, stdout);
 699                         }
 700
 701                         /*
 702                          * We may have shown three-dashes line early
 703                          * between notes and the log message, in which
 704                          * case we only want a blank line after the
 705                          * notes without (an extra) three-dashes line.
 706                          * Otherwise, we show the three-dashes line if
 707                          * we are showing the patch with diffstat, but
 708                          * in that case, there is no extra blank line
 709                          * after the three-dashes line.
 710                          */
 711                         if (!opt->shown_dashes &&
 712                             (pch & opt->diffopt.output_format) == pch)
 713                                 printf("---");
 714                         putchar('\n');
 715                 }
 716         }
 717         diff_flush(&opt->diffopt);
 718         return 1;
 719 }
 720
 721 static int do_diff_combined(struct rev_info *opt, struct commit *commit)
 722 {
 723         diff_tree_combined_merge(commit, opt->dense_combined_merges, opt);
 724         return !opt->loginfo;
 725 }
 726
 727 /*
 728  * Show the diff of a commit.
 729  *
 730  * Return true if we printed any log info messages
 731  */
 732 static int log_tree_diff(struct rev_info *opt, struct commit *commit, struct log_info *log)
 733 {
 734         int showed_log;
 735         struct commit_list *parents;
 736         unsigned const char *sha1;
 737
 738         if (!opt->diff && !DIFF_OPT_TST(&opt->diffopt, EXIT_WITH_STATUS))
 739                 return 0;
 740
 741         parse_commit_or_die(commit);
 742         sha1 = commit->tree->object.sha1;
 743
 744         /* Root commit? */
 745         parents = get_saved_parents(opt, commit);
 746         if (!parents) {
 747                 if (opt->show_root_diff) {
 748                         diff_root_tree_sha1(sha1, "", &opt->diffopt);
 749                         log_tree_diff_flush(opt);
 750                 }
 751                 return !opt->loginfo;
 752         }
 753
 754         /* More than one parent? */
 755         if (parents && parents->next) {
 756                 if (opt->ignore_merges)
 757                         return 0;
 758                 else if (opt->combine_merges)
 759                         return do_diff_combined(opt, commit);
 760                 else if (opt->first_parent_only) {
 761                         /*
 762                          * Generate merge log entry only for the first
 763                          * parent, showing summary diff of the others
 764                          * we merged _in_.
 765                          */
 766                         parse_commit_or_die(parents->item);
 767                         diff_tree_sha1(parents->item->tree->object.sha1,
 768                                        sha1, "", &opt->diffopt);
 769                         log_tree_diff_flush(opt);
 770                         return !opt->loginfo;
 771                 }
 772
 773                 /* If we show individual diffs, show the parent info */
 774                 log->parent = parents->item;
 775         }
 776
 777         showed_log = 0;
 778         for (;;) {
 779                 struct commit *parent = parents->item;
 780
 781                 parse_commit_or_die(parent);
 782                 diff_tree_sha1(parent->tree->object.sha1,
 783                                sha1, "", &opt->diffopt);
 784                 log_tree_diff_flush(opt);
 785
 786                 showed_log |= !opt->loginfo;
 787
 788                 /* Set up the log info for the next parent, if any.. */
 789                 parents = parents->next;
 790                 if (!parents)
 791                         break;
 792                 log->parent = parents->item;
 793                 opt->loginfo = log;
 794         }
 795         return showed_log;
 796 }
 797
 798 int log_tree_commit(struct rev_info *opt, struct commit *commit)
 799 {
 800         struct log_info log;
 801         int shown;
 802
 803         log.commit = commit;
 804         log.parent = NULL;
 805         opt->loginfo = &log;
 806
 807         if (opt->line_level_traverse)
 808                 return line_log_print(opt, commit);
 809
 810         if (opt->track_linear && !opt->linear && !opt->reverse_output_stage)
 811                 printf("\n%s\n", opt->break_bar);
 812         shown = log_tree_diff(opt, commit, &log);
 813         if (!shown && opt->loginfo && opt->always_show_header) {
 814                 log.parent = NULL;
 815                 show_log(opt);
 816                 shown = 1;
 817         }
 818         if (opt->track_linear && !opt->linear && opt->reverse_output_stage)
 819                 printf("\n%s\n", opt->break_bar);
 820         opt->loginfo = NULL;
 821         maybe_flush_or_die(stdout, "stdout");
 822         return shown;
 823 }