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 static struct decoration name_decoration = { "object names" };
  16 static int decoration_loaded;
  17 static int decoration_flags;
  18
  19 static char decoration_colors[][COLOR_MAXLEN] = {
  20         GIT_COLOR_RESET,
  21         GIT_COLOR_BOLD_GREEN,   /* REF_LOCAL */
  22         GIT_COLOR_BOLD_RED,     /* REF_REMOTE */
  23         GIT_COLOR_BOLD_YELLOW,  /* REF_TAG */
  24         GIT_COLOR_BOLD_MAGENTA, /* REF_STASH */
  25         GIT_COLOR_BOLD_CYAN,    /* REF_HEAD */
  26         GIT_COLOR_BOLD_BLUE,    /* GRAFTED */
  27 };
  28
  29 static const char *decorate_get_color(int decorate_use_color, enum decoration_type ix)
  30 {
  31         if (want_color(decorate_use_color))
  32                 return decoration_colors[ix];
  33         return "";
  34 }
  35
  36 static int parse_decorate_color_slot(const char *slot)
  37 {
  38         /*
  39          * We're comparing with 'ignore-case' on
  40          * (because config.c sets them all tolower),
  41          * but let's match the letters in the literal
  42          * string values here with how they are
  43          * documented in Documentation/config.txt, for
  44          * consistency.
  45          *
  46          * We love being consistent, don't we?
  47          */
  48         if (!strcasecmp(slot, "branch"))
  49                 return DECORATION_REF_LOCAL;
  50         if (!strcasecmp(slot, "remoteBranch"))
  51                 return DECORATION_REF_REMOTE;
  52         if (!strcasecmp(slot, "tag"))
  53                 return DECORATION_REF_TAG;
  54         if (!strcasecmp(slot, "stash"))
  55                 return DECORATION_REF_STASH;
  56         if (!strcasecmp(slot, "HEAD"))
  57                 return DECORATION_REF_HEAD;
  58         return -1;
  59 }
  60
  61 int parse_decorate_color_config(const char *var, const char *slot_name, const char *value)
  62 {
  63         int slot = parse_decorate_color_slot(slot_name);
  64         if (slot < 0)
  65                 return 0;
  66         if (!value)
  67                 return config_error_nonbool(var);
  68         return color_parse(value, decoration_colors[slot]);
  69 }
  70
  71 /*
  72  * log-tree.c uses DIFF_OPT_TST for determining whether to use color
  73  * for showing the commit sha1, use the same check for --decorate
  74  */
  75 #define decorate_get_color_opt(o, ix) \
  76         decorate_get_color((o)->use_color, ix)
  77
  78 void add_name_decoration(enum decoration_type type, const char *name, struct object *obj)
  79 {
  80         int nlen = strlen(name);
  81         struct name_decoration *res = xmalloc(sizeof(*res) + nlen + 1);
  82         memcpy(res->name, name, nlen + 1);
  83         res->type = type;
  84         res->next = add_decoration(&name_decoration, obj, res);
  85 }
  86
  87 const struct name_decoration *get_name_decoration(const struct object *obj)
  88 {
  89         return lookup_decoration(&name_decoration, obj);
  90 }
  91
  92 static int add_ref_decoration(const char *refname, const struct object_id *oid,
  93                               int flags, void *cb_data)
  94 {
  95         struct object *obj;
  96         enum decoration_type type = DECORATION_NONE;
  97
  98         assert(cb_data == NULL);
  99
 100         if (starts_with(refname, git_replace_ref_base)) {
 101                 struct object_id original_oid;
 102                 if (!check_replace_refs)
 103                         return 0;
 104                 if (get_oid_hex(refname + strlen(git_replace_ref_base),
 105                                 &original_oid)) {
 106                         warning("invalid replace ref %s", refname);
 107                         return 0;
 108                 }
 109                 obj = parse_object(original_oid.hash);
 110                 if (obj)
 111                         add_name_decoration(DECORATION_GRAFTED, "replaced", obj);
 112                 return 0;
 113         }
 114
 115         obj = parse_object(oid->hash);
 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         add_name_decoration(type, refname, obj);
 131         while (obj->type == OBJ_TAG) {
 132                 obj = ((struct tag *)obj)->tagged;
 133                 if (!obj)
 134                         break;
 135                 if (!obj->parsed)
 136                         parse_object(obj->oid.hash);
 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->oid.hash);
 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         if (!decoration_loaded) {
 154
 155                 decoration_loaded = 1;
 156                 decoration_flags = flags;
 157                 for_each_ref(add_ref_decoration, NULL);
 158                 head_ref(add_ref_decoration, NULL);
 159                 for_each_commit_graft(add_graft_decoration, NULL);
 160         }
 161 }
 162
 163 static void show_parents(struct commit *commit, int abbrev)
 164 {
 165         struct commit_list *p;
 166         for (p = commit->parents; p ; p = p->next) {
 167                 struct commit *parent = p->item;
 168                 printf(" %s", find_unique_abbrev(parent->object.oid.hash, abbrev));
 169         }
 170 }
 171
 172 static void show_children(struct rev_info *opt, struct commit *commit, int abbrev)
 173 {
 174         struct commit_list *p = lookup_decoration(&opt->children, &commit->object);
 175         for ( ; p; p = p->next) {
 176                 printf(" %s", find_unique_abbrev(p->item->object.oid.hash, abbrev));
 177         }
 178 }
 179
 180 /*
 181  * Do we have HEAD in the output, and also the branch it points at?
 182  * If so, find that decoration entry for that current branch.
 183  */
 184 static const struct name_decoration *current_pointed_by_HEAD(const struct name_decoration *decoration)
 185 {
 186         const struct name_decoration *list, *head = NULL;
 187         const char *branch_name = NULL;
 188         unsigned char unused[20];
 189         int rru_flags;
 190
 191         /* First find HEAD */
 192         for (list = decoration; list; list = list->next)
 193                 if (list->type == DECORATION_REF_HEAD) {
 194                         head = list;
 195                         break;
 196                 }
 197         if (!head)
 198                 return NULL;
 199
 200         /* Now resolve and find the matching current branch */
 201         branch_name = resolve_ref_unsafe("HEAD", 0, unused, &rru_flags);
 202         if (!(rru_flags & REF_ISSYMREF))
 203                 return NULL;
 204
 205         if (!starts_with(branch_name, "refs/"))
 206                 return NULL;
 207
 208         /* OK, do we have that ref in the list? */
 209         for (list = decoration; list; list = list->next)
 210                 if ((list->type == DECORATION_REF_LOCAL) &&
 211                     !strcmp(branch_name, list->name)) {
 212                         return list;
 213                 }
 214
 215         return NULL;
 216 }
 217
 218 static void show_name(struct strbuf *sb, const struct name_decoration *decoration)
 219 {
 220         if (decoration_flags == DECORATE_SHORT_REFS)
 221                 strbuf_addstr(sb, prettify_refname(decoration->name));
 222         else
 223                 strbuf_addstr(sb, decoration->name);
 224 }
 225
 226 /*
 227  * The caller makes sure there is no funny color before calling.
 228  * format_decorations_extended makes sure the same after return.
 229  */
 230 void format_decorations_extended(struct strbuf *sb,
 231                         const struct commit *commit,
 232                         int use_color,
 233                         const char *prefix,
 234                         const char *separator,
 235                         const char *suffix)
 236 {
 237         const struct name_decoration *decoration;
 238         const struct name_decoration *current_and_HEAD;
 239         const char *color_commit =
 240                 diff_get_color(use_color, DIFF_COMMIT);
 241         const char *color_reset =
 242                 decorate_get_color(use_color, DECORATION_NONE);
 243
 244         decoration = get_name_decoration(&commit->object);
 245         if (!decoration)
 246                 return;
 247
 248         current_and_HEAD = current_pointed_by_HEAD(decoration);
 249         while (decoration) {
 250                 /*
 251                  * When both current and HEAD are there, only
 252                  * show HEAD->current where HEAD would have
 253                  * appeared, skipping the entry for current.
 254                  */
 255                 if (decoration != current_and_HEAD) {
 256                         strbuf_addstr(sb, color_commit);
 257                         strbuf_addstr(sb, prefix);
 258                         strbuf_addstr(sb, color_reset);
 259                         strbuf_addstr(sb, decorate_get_color(use_color, decoration->type));
 260                         if (decoration->type == DECORATION_REF_TAG)
 261                                 strbuf_addstr(sb, "tag: ");
 262
 263                         show_name(sb, decoration);
 264
 265                         if (current_and_HEAD &&
 266                             decoration->type == DECORATION_REF_HEAD) {
 267                                 strbuf_addstr(sb, color_reset);
 268                                 strbuf_addstr(sb, color_commit);
 269                                 strbuf_addstr(sb, " -> ");
 270                                 strbuf_addstr(sb, color_reset);
 271                                 strbuf_addstr(sb, decorate_get_color(use_color, current_and_HEAD->type));
 272                                 show_name(sb, current_and_HEAD);
 273                         }
 274                         strbuf_addstr(sb, color_reset);
 275
 276                         prefix = separator;
 277                 }
 278                 decoration = decoration->next;
 279         }
 280         strbuf_addstr(sb, color_commit);
 281         strbuf_addstr(sb, suffix);
 282         strbuf_addstr(sb, color_reset);
 283 }
 284
 285 void show_decorations(struct rev_info *opt, struct commit *commit)
 286 {
 287         struct strbuf sb = STRBUF_INIT;
 288
 289         if (opt->show_source && commit->util)
 290                 printf("\t%s", (char *) commit->util);
 291         if (!opt->show_decorations)
 292                 return;
 293         format_decorations(&sb, commit, opt->diffopt.use_color);
 294         fputs(sb.buf, stdout);
 295         strbuf_release(&sb);
 296 }
 297
 298 static unsigned int digits_in_number(unsigned int number)
 299 {
 300         unsigned int i = 10, result = 1;
 301         while (i <= number) {
 302                 i *= 10;
 303                 result++;
 304         }
 305         return result;
 306 }
 307
 308 void fmt_output_subject(struct strbuf *filename,
 309                         const char *subject,
 310                         struct rev_info *info)
 311 {
 312         const char *suffix = info->patch_suffix;
 313         int nr = info->nr;
 314         int start_len = filename->len;
 315         int max_len = start_len + FORMAT_PATCH_NAME_MAX - (strlen(suffix) + 1);
 316
 317         if (0 < info->reroll_count)
 318                 strbuf_addf(filename, "v%d-", info->reroll_count);
 319         strbuf_addf(filename, "%04d-%s", nr, subject);
 320
 321         if (max_len < filename->len)
 322                 strbuf_setlen(filename, max_len);
 323         strbuf_addstr(filename, suffix);
 324 }
 325
 326 void fmt_output_commit(struct strbuf *filename,
 327                        struct commit *commit,
 328                        struct rev_info *info)
 329 {
 330         struct pretty_print_context ctx = {0};
 331         struct strbuf subject = STRBUF_INIT;
 332
 333         format_commit_message(commit, "%f", &subject, &ctx);
 334         fmt_output_subject(filename, subject.buf, info);
 335         strbuf_release(&subject);
 336 }
 337
 338 void log_write_email_headers(struct rev_info *opt, struct commit *commit,
 339                              const char **subject_p,
 340                              const char **extra_headers_p,
 341                              int *need_8bit_cte_p)
 342 {
 343         const char *subject = NULL;
 344         const char *extra_headers = opt->extra_headers;
 345         const char *name = oid_to_hex(opt->zero_commit ?
 346                                       &null_oid : &commit->object.oid);
 347
 348         *need_8bit_cte_p = 0; /* unknown */
 349         if (opt->total > 0) {
 350                 static char buffer[64];
 351                 snprintf(buffer, sizeof(buffer),
 352                          "Subject: [%s%s%0*d/%d] ",
 353                          opt->subject_prefix,
 354                          *opt->subject_prefix ? " " : "",
 355                          digits_in_number(opt->total),
 356                          opt->nr, opt->total);
 357                 subject = buffer;
 358         } else if (opt->total == 0 && opt->subject_prefix && *opt->subject_prefix) {
 359                 static char buffer[256];
 360                 snprintf(buffer, sizeof(buffer),
 361                          "Subject: [%s] ",
 362                          opt->subject_prefix);
 363                 subject = buffer;
 364         } else {
 365                 subject = "Subject: ";
 366         }
 367
 368         printf("From %s Mon Sep 17 00:00:00 2001\n", name);
 369         graph_show_oneline(opt->graph);
 370         if (opt->message_id) {
 371                 printf("Message-Id: <%s>\n", opt->message_id);
 372                 graph_show_oneline(opt->graph);
 373         }
 374         if (opt->ref_message_ids && opt->ref_message_ids->nr > 0) {
 375                 int i, n;
 376                 n = opt->ref_message_ids->nr;
 377                 printf("In-Reply-To: <%s>\n", opt->ref_message_ids->items[n-1].string);
 378                 for (i = 0; i < n; i++)
 379                         printf("%s<%s>\n", (i > 0 ? "\t" : "References: "),
 380                                opt->ref_message_ids->items[i].string);
 381                 graph_show_oneline(opt->graph);
 382         }
 383         if (opt->mime_boundary) {
 384                 static char subject_buffer[1024];
 385                 static char buffer[1024];
 386                 struct strbuf filename =  STRBUF_INIT;
 387                 *need_8bit_cte_p = -1; /* NEVER */
 388                 snprintf(subject_buffer, sizeof(subject_buffer) - 1,
 389                          "%s"
 390                          "MIME-Version: 1.0\n"
 391                          "Content-Type: multipart/mixed;"
 392                          " boundary=\"%s%s\"\n"
 393                          "\n"
 394                          "This is a multi-part message in MIME "
 395                          "format.\n"
 396                          "--%s%s\n"
 397                          "Content-Type: text/plain; "
 398                          "charset=UTF-8; format=fixed\n"
 399                          "Content-Transfer-Encoding: 8bit\n\n",
 400                          extra_headers ? extra_headers : "",
 401                          mime_boundary_leader, opt->mime_boundary,
 402                          mime_boundary_leader, opt->mime_boundary);
 403                 extra_headers = subject_buffer;
 404
 405                 if (opt->numbered_files)
 406                         strbuf_addf(&filename, "%d", opt->nr);
 407                 else
 408                         fmt_output_commit(&filename, commit, opt);
 409                 snprintf(buffer, sizeof(buffer) - 1,
 410                          "\n--%s%s\n"
 411                          "Content-Type: text/x-patch;"
 412                          " name=\"%s\"\n"
 413                          "Content-Transfer-Encoding: 8bit\n"
 414                          "Content-Disposition: %s;"
 415                          " filename=\"%s\"\n\n",
 416                          mime_boundary_leader, opt->mime_boundary,
 417                          filename.buf,
 418                          opt->no_inline ? "attachment" : "inline",
 419                          filename.buf);
 420                 opt->diffopt.stat_sep = buffer;
 421                 strbuf_release(&filename);
 422         }
 423         *subject_p = subject;
 424         *extra_headers_p = extra_headers;
 425 }
 426
 427 static void show_sig_lines(struct rev_info *opt, int status, const char *bol)
 428 {
 429         const char *color, *reset, *eol;
 430
 431         color = diff_get_color_opt(&opt->diffopt,
 432                                    status ? DIFF_WHITESPACE : DIFF_FRAGINFO);
 433         reset = diff_get_color_opt(&opt->diffopt, DIFF_RESET);
 434         while (*bol) {
 435                 eol = strchrnul(bol, '\n');
 436                 printf("%s%.*s%s%s", color, (int)(eol - bol), bol, reset,
 437                        *eol ? "\n" : "");
 438                 graph_show_oneline(opt->graph);
 439                 bol = (*eol) ? (eol + 1) : eol;
 440         }
 441 }
 442
 443 static void show_signature(struct rev_info *opt, struct commit *commit)
 444 {
 445         struct strbuf payload = STRBUF_INIT;
 446         struct strbuf signature = STRBUF_INIT;
 447         struct strbuf gpg_output = STRBUF_INIT;
 448         int status;
 449
 450         if (parse_signed_commit(commit, &payload, &signature) <= 0)
 451                 goto out;
 452
 453         status = verify_signed_buffer(payload.buf, payload.len,
 454                                       signature.buf, signature.len,
 455                                       &gpg_output, NULL);
 456         if (status && !gpg_output.len)
 457                 strbuf_addstr(&gpg_output, "No signature\n");
 458
 459         show_sig_lines(opt, status, gpg_output.buf);
 460
 461  out:
 462         strbuf_release(&gpg_output);
 463         strbuf_release(&payload);
 464         strbuf_release(&signature);
 465 }
 466
 467 static int which_parent(const unsigned char *sha1, const struct commit *commit)
 468 {
 469         int nth;
 470         const struct commit_list *parent;
 471
 472         for (nth = 0, parent = commit->parents; parent; parent = parent->next) {
 473                 if (!hashcmp(parent->item->object.oid.hash, sha1))
 474                         return nth;
 475                 nth++;
 476         }
 477         return -1;
 478 }
 479
 480 static int is_common_merge(const struct commit *commit)
 481 {
 482         return (commit->parents
 483                 && commit->parents->next
 484                 && !commit->parents->next->next);
 485 }
 486
 487 static void show_one_mergetag(struct commit *commit,
 488                               struct commit_extra_header *extra,
 489                               void *data)
 490 {
 491         struct rev_info *opt = (struct rev_info *)data;
 492         unsigned char sha1[20];
 493         struct tag *tag;
 494         struct strbuf verify_message;
 495         int status, nth;
 496         size_t payload_size, gpg_message_offset;
 497
 498         hash_sha1_file(extra->value, extra->len, typename(OBJ_TAG), sha1);
 499         tag = lookup_tag(sha1);
 500         if (!tag)
 501                 return; /* error message already given */
 502
 503         strbuf_init(&verify_message, 256);
 504         if (parse_tag_buffer(tag, extra->value, extra->len))
 505                 strbuf_addstr(&verify_message, "malformed mergetag\n");
 506         else if (is_common_merge(commit) &&
 507                  !oidcmp(&tag->tagged->oid,
 508                           &commit->parents->next->item->object.oid))
 509                 strbuf_addf(&verify_message,
 510                             "merged tag '%s'\n", tag->tag);
 511         else if ((nth = which_parent(tag->tagged->oid.hash, commit)) < 0)
 512                 strbuf_addf(&verify_message, "tag %s names a non-parent %s\n",
 513                                     tag->tag, tag->tagged->oid.hash);
 514         else
 515                 strbuf_addf(&verify_message,
 516                             "parent #%d, tagged '%s'\n", nth + 1, tag->tag);
 517         gpg_message_offset = verify_message.len;
 518
 519         payload_size = parse_signature(extra->value, extra->len);
 520         status = -1;
 521         if (extra->len > payload_size) {
 522                 /* could have a good signature */
 523                 if (!verify_signed_buffer(extra->value, payload_size,
 524                                           extra->value + payload_size,
 525                                           extra->len - payload_size,
 526                                           &verify_message, NULL))
 527                         status = 0; /* good */
 528                 else if (verify_message.len <= gpg_message_offset)
 529                         strbuf_addstr(&verify_message, "No signature\n");
 530                 /* otherwise we couldn't verify, which is shown as bad */
 531         }
 532
 533         show_sig_lines(opt, status, verify_message.buf);
 534         strbuf_release(&verify_message);
 535 }
 536
 537 static void show_mergetag(struct rev_info *opt, struct commit *commit)
 538 {
 539         for_each_mergetag(show_one_mergetag, commit, opt);
 540 }
 541
 542 void show_log(struct rev_info *opt)
 543 {
 544         struct strbuf msgbuf = STRBUF_INIT;
 545         struct log_info *log = opt->loginfo;
 546         struct commit *commit = log->commit, *parent = log->parent;
 547         int abbrev_commit = opt->abbrev_commit ? opt->abbrev : 40;
 548         const char *extra_headers = opt->extra_headers;
 549         struct pretty_print_context ctx = {0};
 550
 551         opt->loginfo = NULL;
 552         if (!opt->verbose_header) {
 553                 graph_show_commit(opt->graph);
 554
 555                 if (!opt->graph)
 556                         put_revision_mark(opt, commit);
 557                 fputs(find_unique_abbrev(commit->object.oid.hash, abbrev_commit), stdout);
 558                 if (opt->print_parents)
 559                         show_parents(commit, abbrev_commit);
 560                 if (opt->children.name)
 561                         show_children(opt, commit, abbrev_commit);
 562                 show_decorations(opt, commit);
 563                 if (opt->graph && !graph_is_commit_finished(opt->graph)) {
 564                         putchar('\n');
 565                         graph_show_remainder(opt->graph);
 566                 }
 567                 putchar(opt->diffopt.line_termination);
 568                 return;
 569         }
 570
 571         /*
 572          * If use_terminator is set, we already handled any record termination
 573          * at the end of the last record.
 574          * Otherwise, add a diffopt.line_termination character before all
 575          * entries but the first.  (IOW, as a separator between entries)
 576          */
 577         if (opt->shown_one && !opt->use_terminator) {
 578                 /*
 579                  * If entries are separated by a newline, the output
 580                  * should look human-readable.  If the last entry ended
 581                  * with a newline, print the graph output before this
 582                  * newline.  Otherwise it will end up as a completely blank
 583                  * line and will look like a gap in the graph.
 584                  *
 585                  * If the entry separator is not a newline, the output is
 586                  * primarily intended for programmatic consumption, and we
 587                  * never want the extra graph output before the entry
 588                  * separator.
 589                  */
 590                 if (opt->diffopt.line_termination == '\n' &&
 591                     !opt->missing_newline)
 592                         graph_show_padding(opt->graph);
 593                 putchar(opt->diffopt.line_termination);
 594         }
 595         opt->shown_one = 1;
 596
 597         /*
 598          * If the history graph was requested,
 599          * print the graph, up to this commit's line
 600          */
 601         graph_show_commit(opt->graph);
 602
 603         /*
 604          * Print header line of header..
 605          */
 606
 607         if (opt->commit_format == CMIT_FMT_EMAIL) {
 608                 log_write_email_headers(opt, commit, &ctx.subject, &extra_headers,
 609                                         &ctx.need_8bit_cte);
 610         } else if (opt->commit_format != CMIT_FMT_USERFORMAT) {
 611                 fputs(diff_get_color_opt(&opt->diffopt, DIFF_COMMIT), stdout);
 612                 if (opt->commit_format != CMIT_FMT_ONELINE)
 613                         fputs("commit ", stdout);
 614
 615                 if (!opt->graph)
 616                         put_revision_mark(opt, commit);
 617                 fputs(find_unique_abbrev(commit->object.oid.hash, abbrev_commit),
 618                       stdout);
 619                 if (opt->print_parents)
 620                         show_parents(commit, abbrev_commit);
 621                 if (opt->children.name)
 622                         show_children(opt, commit, abbrev_commit);
 623                 if (parent)
 624                         printf(" (from %s)",
 625                                find_unique_abbrev(parent->object.oid.hash,
 626                                                   abbrev_commit));
 627                 fputs(diff_get_color_opt(&opt->diffopt, DIFF_RESET), stdout);
 628                 show_decorations(opt, commit);
 629                 if (opt->commit_format == CMIT_FMT_ONELINE) {
 630                         putchar(' ');
 631                 } else {
 632                         putchar('\n');
 633                         graph_show_oneline(opt->graph);
 634                 }
 635                 if (opt->reflog_info) {
 636                         /*
 637                          * setup_revisions() ensures that opt->reflog_info
 638                          * and opt->graph cannot both be set,
 639                          * so we don't need to worry about printing the
 640                          * graph info here.
 641                          */
 642                         show_reflog_message(opt->reflog_info,
 643                                             opt->commit_format == CMIT_FMT_ONELINE,
 644                                             &opt->date_mode,
 645                                             opt->date_mode_explicit);
 646                         if (opt->commit_format == CMIT_FMT_ONELINE)
 647                                 return;
 648                 }
 649         }
 650
 651         if (opt->show_signature) {
 652                 show_signature(opt, commit);
 653                 show_mergetag(opt, commit);
 654         }
 655
 656         if (!get_cached_commit_buffer(commit, NULL))
 657                 return;
 658
 659         if (opt->show_notes) {
 660                 int raw;
 661                 struct strbuf notebuf = STRBUF_INIT;
 662
 663                 raw = (opt->commit_format == CMIT_FMT_USERFORMAT);
 664                 format_display_notes(commit->object.oid.hash, &notebuf,
 665                                      get_log_output_encoding(), raw);
 666                 ctx.notes_message = notebuf.len
 667                         ? strbuf_detach(&notebuf, NULL)
 668                         : xcalloc(1, 1);
 669         }
 670
 671         /*
 672          * And then the pretty-printed message itself
 673          */
 674         if (ctx.need_8bit_cte >= 0 && opt->add_signoff)
 675                 ctx.need_8bit_cte =
 676                         has_non_ascii(fmt_name(getenv("GIT_COMMITTER_NAME"),
 677                                                getenv("GIT_COMMITTER_EMAIL")));
 678         ctx.date_mode = opt->date_mode;
 679         ctx.date_mode_explicit = opt->date_mode_explicit;
 680         ctx.abbrev = opt->diffopt.abbrev;
 681         ctx.after_subject = extra_headers;
 682         ctx.preserve_subject = opt->preserve_subject;
 683         ctx.reflog_info = opt->reflog_info;
 684         ctx.fmt = opt->commit_format;
 685         ctx.mailmap = opt->mailmap;
 686         ctx.color = opt->diffopt.use_color;
 687         ctx.output_encoding = get_log_output_encoding();
 688         if (opt->from_ident.mail_begin && opt->from_ident.name_begin)
 689                 ctx.from_ident = &opt->from_ident;
 690         pretty_print_commit(&ctx, commit, &msgbuf);
 691
 692         if (opt->add_signoff)
 693                 append_signoff(&msgbuf, 0, APPEND_SIGNOFF_DEDUP);
 694
 695         if ((ctx.fmt != CMIT_FMT_USERFORMAT) &&
 696             ctx.notes_message && *ctx.notes_message) {
 697                 if (ctx.fmt == CMIT_FMT_EMAIL) {
 698                         strbuf_addstr(&msgbuf, "---\n");
 699                         opt->shown_dashes = 1;
 700                 }
 701                 strbuf_addstr(&msgbuf, ctx.notes_message);
 702         }
 703
 704         if (opt->show_log_size) {
 705                 printf("log size %i\n", (int)msgbuf.len);
 706                 graph_show_oneline(opt->graph);
 707         }
 708
 709         /*
 710          * Set opt->missing_newline if msgbuf doesn't
 711          * end in a newline (including if it is empty)
 712          */
 713         if (!msgbuf.len || msgbuf.buf[msgbuf.len - 1] != '\n')
 714                 opt->missing_newline = 1;
 715         else
 716                 opt->missing_newline = 0;
 717
 718         if (opt->graph)
 719                 graph_show_commit_msg(opt->graph, &msgbuf);
 720         else
 721                 fwrite(msgbuf.buf, sizeof(char), msgbuf.len, stdout);
 722         if (opt->use_terminator && !commit_format_is_empty(opt->commit_format)) {
 723                 if (!opt->missing_newline)
 724                         graph_show_padding(opt->graph);
 725                 putchar(opt->diffopt.line_termination);
 726         }
 727
 728         strbuf_release(&msgbuf);
 729         free(ctx.notes_message);
 730 }
 731
 732 int log_tree_diff_flush(struct rev_info *opt)
 733 {
 734         opt->shown_dashes = 0;
 735         diffcore_std(&opt->diffopt);
 736
 737         if (diff_queue_is_empty()) {
 738                 int saved_fmt = opt->diffopt.output_format;
 739                 opt->diffopt.output_format = DIFF_FORMAT_NO_OUTPUT;
 740                 diff_flush(&opt->diffopt);
 741                 opt->diffopt.output_format = saved_fmt;
 742                 return 0;
 743         }
 744
 745         if (opt->loginfo && !opt->no_commit_id) {
 746                 show_log(opt);
 747                 if ((opt->diffopt.output_format & ~DIFF_FORMAT_NO_OUTPUT) &&
 748                     opt->verbose_header &&
 749                     opt->commit_format != CMIT_FMT_ONELINE &&
 750                     !commit_format_is_empty(opt->commit_format)) {
 751                         /*
 752                          * When showing a verbose header (i.e. log message),
 753                          * and not in --pretty=oneline format, we would want
 754                          * an extra newline between the end of log and the
 755                          * diff/diffstat output for readability.
 756                          */
 757                         int pch = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_PATCH;
 758                         if (opt->diffopt.output_prefix) {
 759                                 struct strbuf *msg = NULL;
 760                                 msg = opt->diffopt.output_prefix(&opt->diffopt,
 761                                         opt->diffopt.output_prefix_data);
 762                                 fwrite(msg->buf, msg->len, 1, stdout);
 763                         }
 764
 765                         /*
 766                          * We may have shown three-dashes line early
 767                          * between notes and the log message, in which
 768                          * case we only want a blank line after the
 769                          * notes without (an extra) three-dashes line.
 770                          * Otherwise, we show the three-dashes line if
 771                          * we are showing the patch with diffstat, but
 772                          * in that case, there is no extra blank line
 773                          * after the three-dashes line.
 774                          */
 775                         if (!opt->shown_dashes &&
 776                             (pch & opt->diffopt.output_format) == pch)
 777                                 printf("---");
 778                         putchar('\n');
 779                 }
 780         }
 781         diff_flush(&opt->diffopt);
 782         return 1;
 783 }
 784
 785 static int do_diff_combined(struct rev_info *opt, struct commit *commit)
 786 {
 787         diff_tree_combined_merge(commit, opt->dense_combined_merges, opt);
 788         return !opt->loginfo;
 789 }
 790
 791 /*
 792  * Show the diff of a commit.
 793  *
 794  * Return true if we printed any log info messages
 795  */
 796 static int log_tree_diff(struct rev_info *opt, struct commit *commit, struct log_info *log)
 797 {
 798         int showed_log;
 799         struct commit_list *parents;
 800         struct object_id *oid;
 801
 802         if (!opt->diff && !DIFF_OPT_TST(&opt->diffopt, EXIT_WITH_STATUS))
 803                 return 0;
 804
 805         parse_commit_or_die(commit);
 806         oid = &commit->tree->object.oid;
 807
 808         /* Root commit? */
 809         parents = get_saved_parents(opt, commit);
 810         if (!parents) {
 811                 if (opt->show_root_diff) {
 812                         diff_root_tree_sha1(oid->hash, "", &opt->diffopt);
 813                         log_tree_diff_flush(opt);
 814                 }
 815                 return !opt->loginfo;
 816         }
 817
 818         /* More than one parent? */
 819         if (parents && parents->next) {
 820                 if (opt->ignore_merges)
 821                         return 0;
 822                 else if (opt->combine_merges)
 823                         return do_diff_combined(opt, commit);
 824                 else if (opt->first_parent_only) {
 825                         /*
 826                          * Generate merge log entry only for the first
 827                          * parent, showing summary diff of the others
 828                          * we merged _in_.
 829                          */
 830                         parse_commit_or_die(parents->item);
 831                         diff_tree_sha1(parents->item->tree->object.oid.hash,
 832                                        oid->hash, "", &opt->diffopt);
 833                         log_tree_diff_flush(opt);
 834                         return !opt->loginfo;
 835                 }
 836
 837                 /* If we show individual diffs, show the parent info */
 838                 log->parent = parents->item;
 839         }
 840
 841         showed_log = 0;
 842         for (;;) {
 843                 struct commit *parent = parents->item;
 844
 845                 parse_commit_or_die(parent);
 846                 diff_tree_sha1(parent->tree->object.oid.hash,
 847                                oid->hash, "", &opt->diffopt);
 848                 log_tree_diff_flush(opt);
 849
 850                 showed_log |= !opt->loginfo;
 851
 852                 /* Set up the log info for the next parent, if any.. */
 853                 parents = parents->next;
 854                 if (!parents)
 855                         break;
 856                 log->parent = parents->item;
 857                 opt->loginfo = log;
 858         }
 859         return showed_log;
 860 }
 861
 862 int log_tree_commit(struct rev_info *opt, struct commit *commit)
 863 {
 864         struct log_info log;
 865         int shown;
 866
 867         log.commit = commit;
 868         log.parent = NULL;
 869         opt->loginfo = &log;
 870
 871         if (opt->line_level_traverse)
 872                 return line_log_print(opt, commit);
 873
 874         if (opt->track_linear && !opt->linear && !opt->reverse_output_stage)
 875                 printf("\n%s\n", opt->break_bar);
 876         shown = log_tree_diff(opt, commit, &log);
 877         if (!shown && opt->loginfo && opt->always_show_header) {
 878                 log.parent = NULL;
 879                 show_log(opt);
 880                 shown = 1;
 881         }
 882         if (opt->track_linear && !opt->linear && opt->reverse_output_stage)
 883                 printf("\n%s\n", opt->break_bar);
 884         opt->loginfo = NULL;
 885         maybe_flush_or_die(stdout, "stdout");
 886         return shown;
 887 }