git.oblomov.eu Git - git/blob - 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 unsigned char *sha1, int flags, void *cb_data)
  93 {
  94         struct object *obj;
  95         enum decoration_type type = DECORATION_NONE;
  96
  97         assert(cb_data == NULL);
  98
  99         if (starts_with(refname, "refs/replace/")) {
 100                 unsigned char original_sha1[20];
 101                 if (!check_replace_refs)
 102                         return 0;
 103                 if (get_sha1_hex(refname + 13, original_sha1)) {
 104                         warning("invalid replace ref %s", refname);
 105                         return 0;
 106                 }
 107                 obj = parse_object(original_sha1);
 108                 if (obj)
 109                         add_name_decoration(DECORATION_GRAFTED, "replaced", obj);
 110                 return 0;
 111         }
 112
 113         obj = parse_object(sha1);
 114         if (!obj)
 115                 return 0;
 116
 117         if (starts_with(refname, "refs/heads/"))
 118                 type = DECORATION_REF_LOCAL;
 119         else if (starts_with(refname, "refs/remotes/"))
 120                 type = DECORATION_REF_REMOTE;
 121         else if (starts_with(refname, "refs/tags/"))
 122                 type = DECORATION_REF_TAG;
 123         else if (!strcmp(refname, "refs/stash"))
 124                 type = DECORATION_REF_STASH;
 125         else if (!strcmp(refname, "HEAD"))
 126                 type = DECORATION_REF_HEAD;
 127
 128         add_name_decoration(type, refname, obj);
 129         while (obj->type == OBJ_TAG) {
 130                 obj = ((struct tag *)obj)->tagged;
 131                 if (!obj)
 132                         break;
 133                 if (!obj->parsed)
 134                         parse_object(obj->sha1);
 135                 add_name_decoration(DECORATION_REF_TAG, refname, obj);
 136         }
 137         return 0;
 138 }
 139
 140 static int add_graft_decoration(const struct commit_graft *graft, void *cb_data)
 141 {
 142         struct commit *commit = lookup_commit(graft->sha1);
 143         if (!commit)
 144                 return 0;
 145         add_name_decoration(DECORATION_GRAFTED, "grafted", &commit->object);
 146         return 0;
 147 }
 148
 149 void load_ref_decorations(int flags)
 150 {
 151         if (!decoration_loaded) {
 152                 decoration_loaded = 1;
 153                 decoration_flags = flags;
 154                 for_each_ref(add_ref_decoration, NULL);
 155                 head_ref(add_ref_decoration, NULL);
 156                 for_each_commit_graft(add_graft_decoration, NULL);
 157         }
 158 }
 159
 160 static void show_parents(struct commit *commit, int abbrev)
 161 {
 162         struct commit_list *p;
 163         for (p = commit->parents; p ; p = p->next) {
 164                 struct commit *parent = p->item;
 165                 printf(" %s", find_unique_abbrev(parent->object.sha1, abbrev));
 166         }
 167 }
 168
 169 static void show_children(struct rev_info *opt, struct commit *commit, int abbrev)
 170 {
 171         struct commit_list *p = lookup_decoration(&opt->children, &commit->object);
 172         for ( ; p; p = p->next) {
 173                 printf(" %s", find_unique_abbrev(p->item->object.sha1, abbrev));
 174         }
 175 }
 176
 177 /*
 178  * Do we have HEAD in the output, and also the branch it points at?
 179  * If so, find that decoration entry for that current branch.
 180  */
 181 static const struct name_decoration *current_pointed_by_HEAD(const struct name_decoration *decoration)
 182 {
 183         const struct name_decoration *list, *head = NULL;
 184         const char *branch_name = NULL;
 185         unsigned char unused[20];
 186         int rru_flags;
 187
 188         /* First find HEAD */
 189         for (list = decoration; list; list = list->next)
 190                 if (list->type == DECORATION_REF_HEAD) {
 191                         head = list;
 192                         break;
 193                 }
 194         if (!head)
 195                 return NULL;
 196
 197         /* Now resolve and find the matching current branch */
 198         branch_name = resolve_ref_unsafe("HEAD", 0, unused, &rru_flags);
 199         if (!(rru_flags & REF_ISSYMREF))
 200                 return NULL;
 201
 202         if (!starts_with(branch_name, "refs/"))
 203                 return NULL;
 204
 205         /* OK, do we have that ref in the list? */
 206         for (list = decoration; list; list = list->next)
 207                 if ((list->type == DECORATION_REF_LOCAL) &&
 208                     !strcmp(branch_name, list->name)) {
 209                         return list;
 210                 }
 211
 212         return NULL;
 213 }
 214
 215 static void show_name(struct strbuf *sb, const struct name_decoration *decoration)
 216 {
 217         if (decoration_flags == DECORATE_SHORT_REFS)
 218                 strbuf_addstr(sb, prettify_refname(decoration->name));
 219         else
 220                 strbuf_addstr(sb, decoration->name);
 221 }
 222
 223 /*
 224  * The caller makes sure there is no funny color before calling.
 225  * format_decorations_extended makes sure the same after return.
 226  */
 227 void format_decorations_extended(struct strbuf *sb,
 228                         const struct commit *commit,
 229                         int use_color,
 230                         const char *prefix,
 231                         const char *separator,
 232                         const char *suffix)
 233 {
 234         const struct name_decoration *decoration;
 235         const struct name_decoration *current_and_HEAD;
 236         const char *color_commit =
 237                 diff_get_color(use_color, DIFF_COMMIT);
 238         const char *color_reset =
 239                 decorate_get_color(use_color, DECORATION_NONE);
 240
 241         decoration = get_name_decoration(&commit->object);
 242         if (!decoration)
 243                 return;
 244
 245         current_and_HEAD = current_pointed_by_HEAD(decoration);
 246         while (decoration) {
 247                 /*
 248                  * When both current and HEAD are there, only
 249                  * show HEAD->current where HEAD would have
 250                  * appeared, skipping the entry for current.
 251                  */
 252                 if (decoration != current_and_HEAD) {
 253                         strbuf_addstr(sb, color_commit);
 254                         strbuf_addstr(sb, prefix);
 255                         strbuf_addstr(sb, color_reset);
 256                         strbuf_addstr(sb, decorate_get_color(use_color, decoration->type));
 257                         if (decoration->type == DECORATION_REF_TAG)
 258                                 strbuf_addstr(sb, "tag: ");
 259
 260                         show_name(sb, decoration);
 261
 262                         if (current_and_HEAD &&
 263                             decoration->type == DECORATION_REF_HEAD) {
 264                                 strbuf_addstr(sb, color_reset);
 265                                 strbuf_addstr(sb, color_commit);
 266                                 strbuf_addstr(sb, " -> ");
 267                                 strbuf_addstr(sb, color_reset);
 268                                 strbuf_addstr(sb, decorate_get_color(use_color, current_and_HEAD->type));
 269                                 show_name(sb, current_and_HEAD);
 270                         }
 271                         strbuf_addstr(sb, color_reset);
 272
 273                         prefix = separator;
 274                 }
 275                 decoration = decoration->next;
 276         }
 277         strbuf_addstr(sb, color_commit);
 278         strbuf_addstr(sb, suffix);
 279         strbuf_addstr(sb, color_reset);
 280 }
 281
 282 void show_decorations(struct rev_info *opt, struct commit *commit)
 283 {
 284         struct strbuf sb = STRBUF_INIT;
 285
 286         if (opt->show_source && commit->util)
 287                 printf("\t%s", (char *) commit->util);
 288         if (!opt->show_decorations)
 289                 return;
 290         format_decorations(&sb, commit, opt->diffopt.use_color);
 291         fputs(sb.buf, stdout);
 292         strbuf_release(&sb);
 293 }
 294
 295 static unsigned int digits_in_number(unsigned int number)
 296 {
 297         unsigned int i = 10, result = 1;
 298         while (i <= number) {
 299                 i *= 10;
 300                 result++;
 301         }
 302         return result;
 303 }
 304
 305 void fmt_output_subject(struct strbuf *filename,
 306                         const char *subject,
 307                         struct rev_info *info)
 308 {
 309         const char *suffix = info->patch_suffix;
 310         int nr = info->nr;
 311         int start_len = filename->len;
 312         int max_len = start_len + FORMAT_PATCH_NAME_MAX - (strlen(suffix) + 1);
 313
 314         if (0 < info->reroll_count)
 315                 strbuf_addf(filename, "v%d-", info->reroll_count);
 316         strbuf_addf(filename, "%04d-%s", nr, subject);
 317
 318         if (max_len < filename->len)
 319                 strbuf_setlen(filename, max_len);
 320         strbuf_addstr(filename, suffix);
 321 }
 322
 323 void fmt_output_commit(struct strbuf *filename,
 324                        struct commit *commit,
 325                        struct rev_info *info)
 326 {
 327         struct pretty_print_context ctx = {0};
 328         struct strbuf subject = STRBUF_INIT;
 329
 330         format_commit_message(commit, "%f", &subject, &ctx);
 331         fmt_output_subject(filename, subject.buf, info);
 332         strbuf_release(&subject);
 333 }
 334
 335 void log_write_email_headers(struct rev_info *opt, struct commit *commit,
 336                              const char **subject_p,
 337                              const char **extra_headers_p,
 338                              int *need_8bit_cte_p)
 339 {
 340         const char *subject = NULL;
 341         const char *extra_headers = opt->extra_headers;
 342         const char *name = sha1_to_hex(commit->object.sha1);
 343
 344         *need_8bit_cte_p = 0; /* unknown */
 345         if (opt->total > 0) {
 346                 static char buffer[64];
 347                 snprintf(buffer, sizeof(buffer),
 348                          "Subject: [%s%s%0*d/%d] ",
 349                          opt->subject_prefix,
 350                          *opt->subject_prefix ? " " : "",
 351                          digits_in_number(opt->total),
 352                          opt->nr, opt->total);
 353                 subject = buffer;
 354         } else if (opt->total == 0 && opt->subject_prefix && *opt->subject_prefix) {
 355                 static char buffer[256];
 356                 snprintf(buffer, sizeof(buffer),
 357                          "Subject: [%s] ",
 358                          opt->subject_prefix);
 359                 subject = buffer;
 360         } else {
 361                 subject = "Subject: ";
 362         }
 363
 364         printf("From %s Mon Sep 17 00:00:00 2001\n", name);
 365         graph_show_oneline(opt->graph);
 366         if (opt->message_id) {
 367                 printf("Message-Id: <%s>\n", opt->message_id);
 368                 graph_show_oneline(opt->graph);
 369         }
 370         if (opt->ref_message_ids && opt->ref_message_ids->nr > 0) {
 371                 int i, n;
 372                 n = opt->ref_message_ids->nr;
 373                 printf("In-Reply-To: <%s>\n", opt->ref_message_ids->items[n-1].string);
 374                 for (i = 0; i < n; i++)
 375                         printf("%s<%s>\n", (i > 0 ? "\t" : "References: "),
 376                                opt->ref_message_ids->items[i].string);
 377                 graph_show_oneline(opt->graph);
 378         }
 379         if (opt->mime_boundary) {
 380                 static char subject_buffer[1024];
 381                 static char buffer[1024];
 382                 struct strbuf filename =  STRBUF_INIT;
 383                 *need_8bit_cte_p = -1; /* NEVER */
 384                 snprintf(subject_buffer, sizeof(subject_buffer) - 1,
 385                          "%s"
 386                          "MIME-Version: 1.0\n"
 387                          "Content-Type: multipart/mixed;"
 388                          " boundary=\"%s%s\"\n"
 389                          "\n"
 390                          "This is a multi-part message in MIME "
 391                          "format.\n"
 392                          "--%s%s\n"
 393                          "Content-Type: text/plain; "
 394                          "charset=UTF-8; format=fixed\n"
 395                          "Content-Transfer-Encoding: 8bit\n\n",
 396                          extra_headers ? extra_headers : "",
 397                          mime_boundary_leader, opt->mime_boundary,
 398                          mime_boundary_leader, opt->mime_boundary);
 399                 extra_headers = subject_buffer;
 400
 401                 if (opt->numbered_files)
 402                         strbuf_addf(&filename, "%d", opt->nr);
 403                 else
 404                         fmt_output_commit(&filename, commit, opt);
 405                 snprintf(buffer, sizeof(buffer) - 1,
 406                          "\n--%s%s\n"
 407                          "Content-Type: text/x-patch;"
 408                          " name=\"%s\"\n"
 409                          "Content-Transfer-Encoding: 8bit\n"
 410                          "Content-Disposition: %s;"
 411                          " filename=\"%s\"\n\n",
 412                          mime_boundary_leader, opt->mime_boundary,
 413                          filename.buf,
 414                          opt->no_inline ? "attachment" : "inline",
 415                          filename.buf);
 416                 opt->diffopt.stat_sep = buffer;
 417                 strbuf_release(&filename);
 418         }
 419         *subject_p = subject;
 420         *extra_headers_p = extra_headers;
 421 }
 422
 423 static void show_sig_lines(struct rev_info *opt, int status, const char *bol)
 424 {
 425         const char *color, *reset, *eol;
 426
 427         color = diff_get_color_opt(&opt->diffopt,
 428                                    status ? DIFF_WHITESPACE : DIFF_FRAGINFO);
 429         reset = diff_get_color_opt(&opt->diffopt, DIFF_RESET);
 430         while (*bol) {
 431                 eol = strchrnul(bol, '\n');
 432                 printf("%s%.*s%s%s", color, (int)(eol - bol), bol, reset,
 433                        *eol ? "\n" : "");
 434                 graph_show_oneline(opt->graph);
 435                 bol = (*eol) ? (eol + 1) : eol;
 436         }
 437 }
 438
 439 static void show_signature(struct rev_info *opt, struct commit *commit)
 440 {
 441         struct strbuf payload = STRBUF_INIT;
 442         struct strbuf signature = STRBUF_INIT;
 443         struct strbuf gpg_output = STRBUF_INIT;
 444         int status;
 445
 446         if (parse_signed_commit(commit, &payload, &signature) <= 0)
 447                 goto out;
 448
 449         status = verify_signed_buffer(payload.buf, payload.len,
 450                                       signature.buf, signature.len,
 451                                       &gpg_output, NULL);
 452         if (status && !gpg_output.len)
 453                 strbuf_addstr(&gpg_output, "No signature\n");
 454
 455         show_sig_lines(opt, status, gpg_output.buf);
 456
 457  out:
 458         strbuf_release(&gpg_output);
 459         strbuf_release(&payload);
 460         strbuf_release(&signature);
 461 }
 462
 463 static int which_parent(const unsigned char *sha1, const struct commit *commit)
 464 {
 465         int nth;
 466         const struct commit_list *parent;
 467
 468         for (nth = 0, parent = commit->parents; parent; parent = parent->next) {
 469                 if (!hashcmp(parent->item->object.sha1, sha1))
 470                         return nth;
 471                 nth++;
 472         }
 473         return -1;
 474 }
 475
 476 static int is_common_merge(const struct commit *commit)
 477 {
 478         return (commit->parents
 479                 && commit->parents->next
 480                 && !commit->parents->next->next);
 481 }
 482
 483 static void show_one_mergetag(struct commit *commit,
 484                               struct commit_extra_header *extra,
 485                               void *data)
 486 {
 487         struct rev_info *opt = (struct rev_info *)data;
 488         unsigned char sha1[20];
 489         struct tag *tag;
 490         struct strbuf verify_message;
 491         int status, nth;
 492         size_t payload_size, gpg_message_offset;
 493
 494         hash_sha1_file(extra->value, extra->len, typename(OBJ_TAG), sha1);
 495         tag = lookup_tag(sha1);
 496         if (!tag)
 497                 return; /* error message already given */
 498
 499         strbuf_init(&verify_message, 256);
 500         if (parse_tag_buffer(tag, extra->value, extra->len))
 501                 strbuf_addstr(&verify_message, "malformed mergetag\n");
 502         else if (is_common_merge(commit) &&
 503                  !hashcmp(tag->tagged->sha1,
 504                           commit->parents->next->item->object.sha1))
 505                 strbuf_addf(&verify_message,
 506                             "merged tag '%s'\n", tag->tag);
 507         else if ((nth = which_parent(tag->tagged->sha1, commit)) < 0)
 508                 strbuf_addf(&verify_message, "tag %s names a non-parent %s\n",
 509                                     tag->tag, tag->tagged->sha1);
 510         else
 511                 strbuf_addf(&verify_message,
 512                             "parent #%d, tagged '%s'\n", nth + 1, tag->tag);
 513         gpg_message_offset = verify_message.len;
 514
 515         payload_size = parse_signature(extra->value, extra->len);
 516         status = -1;
 517         if (extra->len > payload_size) {
 518                 /* could have a good signature */
 519                 if (!verify_signed_buffer(extra->value, payload_size,
 520                                           extra->value + payload_size,
 521                                           extra->len - payload_size,
 522                                           &verify_message, NULL))
 523                         status = 0; /* good */
 524                 else if (verify_message.len <= gpg_message_offset)
 525                         strbuf_addstr(&verify_message, "No signature\n");
 526                 /* otherwise we couldn't verify, which is shown as bad */
 527         }
 528
 529         show_sig_lines(opt, status, verify_message.buf);
 530         strbuf_release(&verify_message);
 531 }
 532
 533 static void show_mergetag(struct rev_info *opt, struct commit *commit)
 534 {
 535         for_each_mergetag(show_one_mergetag, commit, opt);
 536 }
 537
 538 void show_log(struct rev_info *opt)
 539 {
 540         struct strbuf msgbuf = STRBUF_INIT;
 541         struct log_info *log = opt->loginfo;
 542         struct commit *commit = log->commit, *parent = log->parent;
 543         int abbrev_commit = opt->abbrev_commit ? opt->abbrev : 40;
 544         const char *extra_headers = opt->extra_headers;
 545         struct pretty_print_context ctx = {0};
 546
 547         opt->loginfo = NULL;
 548         if (!opt->verbose_header) {
 549                 graph_show_commit(opt->graph);
 550
 551                 if (!opt->graph)
 552                         put_revision_mark(opt, commit);
 553                 fputs(find_unique_abbrev(commit->object.sha1, abbrev_commit), stdout);
 554                 if (opt->print_parents)
 555                         show_parents(commit, abbrev_commit);
 556                 if (opt->children.name)
 557                         show_children(opt, commit, abbrev_commit);
 558                 show_decorations(opt, commit);
 559                 if (opt->graph && !graph_is_commit_finished(opt->graph)) {
 560                         putchar('\n');
 561                         graph_show_remainder(opt->graph);
 562                 }
 563                 putchar(opt->diffopt.line_termination);
 564                 return;
 565         }
 566
 567         /*
 568          * If use_terminator is set, we already handled any record termination
 569          * at the end of the last record.
 570          * Otherwise, add a diffopt.line_termination character before all
 571          * entries but the first.  (IOW, as a separator between entries)
 572          */
 573         if (opt->shown_one && !opt->use_terminator) {
 574                 /*
 575                  * If entries are separated by a newline, the output
 576                  * should look human-readable.  If the last entry ended
 577                  * with a newline, print the graph output before this
 578                  * newline.  Otherwise it will end up as a completely blank
 579                  * line and will look like a gap in the graph.
 580                  *
 581                  * If the entry separator is not a newline, the output is
 582                  * primarily intended for programmatic consumption, and we
 583                  * never want the extra graph output before the entry
 584                  * separator.
 585                  */
 586                 if (opt->diffopt.line_termination == '\n' &&
 587                     !opt->missing_newline)
 588                         graph_show_padding(opt->graph);
 589                 putchar(opt->diffopt.line_termination);
 590         }
 591         opt->shown_one = 1;
 592
 593         /*
 594          * If the history graph was requested,
 595          * print the graph, up to this commit's line
 596          */
 597         graph_show_commit(opt->graph);
 598
 599         /*
 600          * Print header line of header..
 601          */
 602
 603         if (opt->commit_format == CMIT_FMT_EMAIL) {
 604                 log_write_email_headers(opt, commit, &ctx.subject, &extra_headers,
 605                                         &ctx.need_8bit_cte);
 606         } else if (opt->commit_format != CMIT_FMT_USERFORMAT) {
 607                 fputs(diff_get_color_opt(&opt->diffopt, DIFF_COMMIT), stdout);
 608                 if (opt->commit_format != CMIT_FMT_ONELINE)
 609                         fputs("commit ", stdout);
 610
 611                 if (!opt->graph)
 612                         put_revision_mark(opt, commit);
 613                 fputs(find_unique_abbrev(commit->object.sha1, abbrev_commit),
 614                       stdout);
 615                 if (opt->print_parents)
 616                         show_parents(commit, abbrev_commit);
 617                 if (opt->children.name)
 618                         show_children(opt, commit, abbrev_commit);
 619                 if (parent)
 620                         printf(" (from %s)",
 621                                find_unique_abbrev(parent->object.sha1,
 622                                                   abbrev_commit));
 623                 fputs(diff_get_color_opt(&opt->diffopt, DIFF_RESET), stdout);
 624                 show_decorations(opt, commit);
 625                 if (opt->commit_format == CMIT_FMT_ONELINE) {
 626                         putchar(' ');
 627                 } else {
 628                         putchar('\n');
 629                         graph_show_oneline(opt->graph);
 630                 }
 631                 if (opt->reflog_info) {
 632                         /*
 633                          * setup_revisions() ensures that opt->reflog_info
 634                          * and opt->graph cannot both be set,
 635                          * so we don't need to worry about printing the
 636                          * graph info here.
 637                          */
 638                         show_reflog_message(opt->reflog_info,
 639                                             opt->commit_format == CMIT_FMT_ONELINE,
 640                                             opt->date_mode,
 641                                             opt->date_mode_explicit);
 642                         if (opt->commit_format == CMIT_FMT_ONELINE)
 643                                 return;
 644                 }
 645         }
 646
 647         if (opt->show_signature) {
 648                 show_signature(opt, commit);
 649                 show_mergetag(opt, commit);
 650         }
 651
 652         if (!get_cached_commit_buffer(commit, NULL))
 653                 return;
 654
 655         if (opt->show_notes) {
 656                 int raw;
 657                 struct strbuf notebuf = STRBUF_INIT;
 658
 659                 raw = (opt->commit_format == CMIT_FMT_USERFORMAT);
 660                 format_display_notes(commit->object.sha1, &notebuf,
 661                                      get_log_output_encoding(), raw);
 662                 ctx.notes_message = notebuf.len
 663                         ? strbuf_detach(&notebuf, NULL)
 664                         : xcalloc(1, 1);
 665         }
 666
 667         /*
 668          * And then the pretty-printed message itself
 669          */
 670         if (ctx.need_8bit_cte >= 0 && opt->add_signoff)
 671                 ctx.need_8bit_cte =
 672                         has_non_ascii(fmt_name(getenv("GIT_COMMITTER_NAME"),
 673                                                getenv("GIT_COMMITTER_EMAIL")));
 674         ctx.date_mode = opt->date_mode;
 675         ctx.date_mode_explicit = opt->date_mode_explicit;
 676         ctx.abbrev = opt->diffopt.abbrev;
 677         ctx.after_subject = extra_headers;
 678         ctx.preserve_subject = opt->preserve_subject;
 679         ctx.reflog_info = opt->reflog_info;
 680         ctx.fmt = opt->commit_format;
 681         ctx.mailmap = opt->mailmap;
 682         ctx.color = opt->diffopt.use_color;
 683         ctx.output_encoding = get_log_output_encoding();
 684         if (opt->from_ident.mail_begin && opt->from_ident.name_begin)
 685                 ctx.from_ident = &opt->from_ident;
 686         pretty_print_commit(&ctx, commit, &msgbuf);
 687
 688         if (opt->add_signoff)
 689                 append_signoff(&msgbuf, 0, APPEND_SIGNOFF_DEDUP);
 690
 691         if ((ctx.fmt != CMIT_FMT_USERFORMAT) &&
 692             ctx.notes_message && *ctx.notes_message) {
 693                 if (ctx.fmt == CMIT_FMT_EMAIL) {
 694                         strbuf_addstr(&msgbuf, "---\n");
 695                         opt->shown_dashes = 1;
 696                 }
 697                 strbuf_addstr(&msgbuf, ctx.notes_message);
 698         }
 699
 700         if (opt->show_log_size) {
 701                 printf("log size %i\n", (int)msgbuf.len);
 702                 graph_show_oneline(opt->graph);
 703         }
 704
 705         /*
 706          * Set opt->missing_newline if msgbuf doesn't
 707          * end in a newline (including if it is empty)
 708          */
 709         if (!msgbuf.len || msgbuf.buf[msgbuf.len - 1] != '\n')
 710                 opt->missing_newline = 1;
 711         else
 712                 opt->missing_newline = 0;
 713
 714         if (opt->graph)
 715                 graph_show_commit_msg(opt->graph, &msgbuf);
 716         else
 717                 fwrite(msgbuf.buf, sizeof(char), msgbuf.len, stdout);
 718         if (opt->use_terminator && !commit_format_is_empty(opt->commit_format)) {
 719                 if (!opt->missing_newline)
 720                         graph_show_padding(opt->graph);
 721                 putchar(opt->diffopt.line_termination);
 722         }
 723
 724         strbuf_release(&msgbuf);
 725         free(ctx.notes_message);
 726 }
 727
 728 int log_tree_diff_flush(struct rev_info *opt)
 729 {
 730         opt->shown_dashes = 0;
 731         diffcore_std(&opt->diffopt);
 732
 733         if (diff_queue_is_empty()) {
 734                 int saved_fmt = opt->diffopt.output_format;
 735                 opt->diffopt.output_format = DIFF_FORMAT_NO_OUTPUT;
 736                 diff_flush(&opt->diffopt);
 737                 opt->diffopt.output_format = saved_fmt;
 738                 return 0;
 739         }
 740
 741         if (opt->loginfo && !opt->no_commit_id) {
 742                 show_log(opt);
 743                 if ((opt->diffopt.output_format & ~DIFF_FORMAT_NO_OUTPUT) &&
 744                     opt->verbose_header &&
 745                     opt->commit_format != CMIT_FMT_ONELINE &&
 746                     !commit_format_is_empty(opt->commit_format)) {
 747                         /*
 748                          * When showing a verbose header (i.e. log message),
 749                          * and not in --pretty=oneline format, we would want
 750                          * an extra newline between the end of log and the
 751                          * diff/diffstat output for readability.
 752                          */
 753                         int pch = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_PATCH;
 754                         if (opt->diffopt.output_prefix) {
 755                                 struct strbuf *msg = NULL;
 756                                 msg = opt->diffopt.output_prefix(&opt->diffopt,
 757                                         opt->diffopt.output_prefix_data);
 758                                 fwrite(msg->buf, msg->len, 1, stdout);
 759                         }
 760
 761                         /*
 762                          * We may have shown three-dashes line early
 763                          * between notes and the log message, in which
 764                          * case we only want a blank line after the
 765                          * notes without (an extra) three-dashes line.
 766                          * Otherwise, we show the three-dashes line if
 767                          * we are showing the patch with diffstat, but
 768                          * in that case, there is no extra blank line
 769                          * after the three-dashes line.
 770                          */
 771                         if (!opt->shown_dashes &&
 772                             (pch & opt->diffopt.output_format) == pch)
 773                                 printf("---");
 774                         putchar('\n');
 775                 }
 776         }
 777         diff_flush(&opt->diffopt);
 778         return 1;
 779 }
 780
 781 static int do_diff_combined(struct rev_info *opt, struct commit *commit)
 782 {
 783         diff_tree_combined_merge(commit, opt->dense_combined_merges, opt);
 784         return !opt->loginfo;
 785 }
 786
 787 /*
 788  * Show the diff of a commit.
 789  *
 790  * Return true if we printed any log info messages
 791  */
 792 static int log_tree_diff(struct rev_info *opt, struct commit *commit, struct log_info *log)
 793 {
 794         int showed_log;
 795         struct commit_list *parents;
 796         unsigned const char *sha1;
 797
 798         if (!opt->diff && !DIFF_OPT_TST(&opt->diffopt, EXIT_WITH_STATUS))
 799                 return 0;
 800
 801         parse_commit_or_die(commit);
 802         sha1 = commit->tree->object.sha1;
 803
 804         /* Root commit? */
 805         parents = get_saved_parents(opt, commit);
 806         if (!parents) {
 807                 if (opt->show_root_diff) {
 808                         diff_root_tree_sha1(sha1, "", &opt->diffopt);
 809                         log_tree_diff_flush(opt);
 810                 }
 811                 return !opt->loginfo;
 812         }
 813
 814         /* More than one parent? */
 815         if (parents && parents->next) {
 816                 if (opt->ignore_merges)
 817                         return 0;
 818                 else if (opt->combine_merges)
 819                         return do_diff_combined(opt, commit);
 820                 else if (opt->first_parent_only) {
 821                         /*
 822                          * Generate merge log entry only for the first
 823                          * parent, showing summary diff of the others
 824                          * we merged _in_.
 825                          */
 826                         parse_commit_or_die(parents->item);
 827                         diff_tree_sha1(parents->item->tree->object.sha1,
 828                                        sha1, "", &opt->diffopt);
 829                         log_tree_diff_flush(opt);
 830                         return !opt->loginfo;
 831                 }
 832
 833                 /* If we show individual diffs, show the parent info */
 834                 log->parent = parents->item;
 835         }
 836
 837         showed_log = 0;
 838         for (;;) {
 839                 struct commit *parent = parents->item;
 840
 841                 parse_commit_or_die(parent);
 842                 diff_tree_sha1(parent->tree->object.sha1,
 843                                sha1, "", &opt->diffopt);
 844                 log_tree_diff_flush(opt);
 845
 846                 showed_log |= !opt->loginfo;
 847
 848                 /* Set up the log info for the next parent, if any.. */
 849                 parents = parents->next;
 850                 if (!parents)
 851                         break;
 852                 log->parent = parents->item;
 853                 opt->loginfo = log;
 854         }
 855         return showed_log;
 856 }
 857
 858 int log_tree_commit(struct rev_info *opt, struct commit *commit)
 859 {
 860         struct log_info log;
 861         int shown;
 862
 863         log.commit = commit;
 864         log.parent = NULL;
 865         opt->loginfo = &log;
 866
 867         if (opt->line_level_traverse)
 868                 return line_log_print(opt, commit);
 869
 870         if (opt->track_linear && !opt->linear && !opt->reverse_output_stage)
 871                 printf("\n%s\n", opt->break_bar);
 872         shown = log_tree_diff(opt, commit, &log);
 873         if (!shown && opt->loginfo && opt->always_show_header) {
 874                 log.parent = NULL;
 875                 show_log(opt);
 876                 shown = 1;
 877         }
 878         if (opt->track_linear && !opt->linear && opt->reverse_output_stage)
 879                 printf("\n%s\n", opt->break_bar);
 880         opt->loginfo = NULL;
 881         maybe_flush_or_die(stdout, "stdout");
 882         return shown;
 883 }