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
  17 static char decoration_colors[][COLOR_MAXLEN] = {
  18         GIT_COLOR_RESET,
  19         GIT_COLOR_BOLD_GREEN,   /* REF_LOCAL */
  20         GIT_COLOR_BOLD_RED,     /* REF_REMOTE */
  21         GIT_COLOR_BOLD_YELLOW,  /* REF_TAG */
  22         GIT_COLOR_BOLD_MAGENTA, /* REF_STASH */
  23         GIT_COLOR_BOLD_CYAN,    /* REF_HEAD */
  24         GIT_COLOR_BOLD_BLUE,    /* GRAFTED */
  25 };
  26
  27 static const char *decorate_get_color(int decorate_use_color, enum decoration_type ix)
  28 {
  29         if (want_color(decorate_use_color))
  30                 return decoration_colors[ix];
  31         return "";
  32 }
  33
  34 static int parse_decorate_color_slot(const char *slot)
  35 {
  36         /*
  37          * We're comparing with 'ignore-case' on
  38          * (because config.c sets them all tolower),
  39          * but let's match the letters in the literal
  40          * string values here with how they are
  41          * documented in Documentation/config.txt, for
  42          * consistency.
  43          *
  44          * We love being consistent, don't we?
  45          */
  46         if (!strcasecmp(slot, "branch"))
  47                 return DECORATION_REF_LOCAL;
  48         if (!strcasecmp(slot, "remoteBranch"))
  49                 return DECORATION_REF_REMOTE;
  50         if (!strcasecmp(slot, "tag"))
  51                 return DECORATION_REF_TAG;
  52         if (!strcasecmp(slot, "stash"))
  53                 return DECORATION_REF_STASH;
  54         if (!strcasecmp(slot, "HEAD"))
  55                 return DECORATION_REF_HEAD;
  56         return -1;
  57 }
  58
  59 int parse_decorate_color_config(const char *var, const char *slot_name, const char *value)
  60 {
  61         int slot = parse_decorate_color_slot(slot_name);
  62         if (slot < 0)
  63                 return 0;
  64         if (!value)
  65                 return config_error_nonbool(var);
  66         return color_parse(value, decoration_colors[slot]);
  67 }
  68
  69 /*
  70  * log-tree.c uses DIFF_OPT_TST for determining whether to use color
  71  * for showing the commit sha1, use the same check for --decorate
  72  */
  73 #define decorate_get_color_opt(o, ix) \
  74         decorate_get_color((o)->use_color, ix)
  75
  76 void add_name_decoration(enum decoration_type type, const char *name, struct object *obj)
  77 {
  78         int nlen = strlen(name);
  79         struct name_decoration *res = xmalloc(sizeof(*res) + nlen + 1);
  80         memcpy(res->name, name, nlen + 1);
  81         res->type = type;
  82         res->next = add_decoration(&name_decoration, obj, res);
  83 }
  84
  85 const struct name_decoration *get_name_decoration(const struct object *obj)
  86 {
  87         return lookup_decoration(&name_decoration, obj);
  88 }
  89
  90 static int add_ref_decoration(const char *refname, const unsigned char *sha1, int flags, void *cb_data)
  91 {
  92         struct object *obj;
  93         enum decoration_type type = DECORATION_NONE;
  94
  95         if (starts_with(refname, "refs/replace/")) {
  96                 unsigned char original_sha1[20];
  97                 if (!check_replace_refs)
  98                         return 0;
  99                 if (get_sha1_hex(refname + 13, original_sha1)) {
 100                         warning("invalid replace ref %s", refname);
 101                         return 0;
 102                 }
 103                 obj = parse_object(original_sha1);
 104                 if (obj)
 105                         add_name_decoration(DECORATION_GRAFTED, "replaced", obj);
 106                 return 0;
 107         }
 108
 109         obj = parse_object(sha1);
 110         if (!obj)
 111                 return 0;
 112
 113         if (starts_with(refname, "refs/heads/"))
 114                 type = DECORATION_REF_LOCAL;
 115         else if (starts_with(refname, "refs/remotes/"))
 116                 type = DECORATION_REF_REMOTE;
 117         else if (starts_with(refname, "refs/tags/"))
 118                 type = DECORATION_REF_TAG;
 119         else if (!strcmp(refname, "refs/stash"))
 120                 type = DECORATION_REF_STASH;
 121         else if (!strcmp(refname, "HEAD"))
 122                 type = DECORATION_REF_HEAD;
 123
 124         if (!cb_data || *(int *)cb_data == DECORATE_SHORT_REFS)
 125                 refname = prettify_refname(refname);
 126         add_name_decoration(type, refname, obj);
 127         while (obj->type == OBJ_TAG) {
 128                 obj = ((struct tag *)obj)->tagged;
 129                 if (!obj)
 130                         break;
 131                 if (!obj->parsed)
 132                         parse_object(obj->sha1);
 133                 add_name_decoration(DECORATION_REF_TAG, refname, obj);
 134         }
 135         return 0;
 136 }
 137
 138 static int add_graft_decoration(const struct commit_graft *graft, void *cb_data)
 139 {
 140         struct commit *commit = lookup_commit(graft->sha1);
 141         if (!commit)
 142                 return 0;
 143         add_name_decoration(DECORATION_GRAFTED, "grafted", &commit->object);
 144         return 0;
 145 }
 146
 147 void load_ref_decorations(int flags)
 148 {
 149         static int loaded;
 150         if (!loaded) {
 151                 loaded = 1;
 152                 for_each_ref(add_ref_decoration, &flags);
 153                 head_ref(add_ref_decoration, &flags);
 154                 for_each_commit_graft(add_graft_decoration, NULL);
 155         }
 156 }
 157
 158 static void show_parents(struct commit *commit, int abbrev)
 159 {
 160         struct commit_list *p;
 161         for (p = commit->parents; p ; p = p->next) {
 162                 struct commit *parent = p->item;
 163                 printf(" %s", find_unique_abbrev(parent->object.sha1, abbrev));
 164         }
 165 }
 166
 167 static void show_children(struct rev_info *opt, struct commit *commit, int abbrev)
 168 {
 169         struct commit_list *p = lookup_decoration(&opt->children, &commit->object);
 170         for ( ; p; p = p->next) {
 171                 printf(" %s", find_unique_abbrev(p->item->object.sha1, abbrev));
 172         }
 173 }
 174
 175 /*
 176  * Do we have HEAD in the output, and also the branch it points at?
 177  * If so, find that decoration entry for that current branch.
 178  */
 179 static const struct name_decoration *current_pointed_by_HEAD(const struct name_decoration *decoration)
 180 {
 181         const struct name_decoration *list, *head = NULL;
 182         const char *branch_name = NULL;
 183         unsigned char unused[20];
 184         int rru_flags;
 185
 186         /* First find HEAD */
 187         for (list = decoration; list; list = list->next)
 188                 if (list->type == DECORATION_REF_HEAD) {
 189                         head = list;
 190                         break;
 191                 }
 192         if (!head)
 193                 return NULL;
 194
 195         /* Now resolve and find the matching current branch */
 196         branch_name = resolve_ref_unsafe("HEAD", 0, unused, &rru_flags);
 197         if (!(rru_flags & REF_ISSYMREF))
 198                 return NULL;
 199         if (!skip_prefix(branch_name, "refs/heads/", &branch_name))
 200                 return NULL;
 201
 202         /* OK, do we have that ref in the list? */
 203         for (list = decoration; list; list = list->next)
 204                 if ((list->type == DECORATION_REF_LOCAL) &&
 205                     !strcmp(branch_name, list->name)) {
 206                         return list;
 207                 }
 208
 209         return NULL;
 210 }
 211
 212 /*
 213  * The caller makes sure there is no funny color before calling.
 214  * format_decorations_extended makes sure the same after return.
 215  */
 216 void format_decorations_extended(struct strbuf *sb,
 217                         const struct commit *commit,
 218                         int use_color,
 219                         const char *prefix,
 220                         const char *separator,
 221                         const char *suffix)
 222 {
 223         const struct name_decoration *decoration;
 224         const struct name_decoration *current_and_HEAD;
 225         const char *color_commit =
 226                 diff_get_color(use_color, DIFF_COMMIT);
 227         const char *color_reset =
 228                 decorate_get_color(use_color, DECORATION_NONE);
 229
 230         decoration = get_name_decoration(&commit->object);
 231         if (!decoration)
 232                 return;
 233
 234         current_and_HEAD = current_pointed_by_HEAD(decoration);
 235         while (decoration) {
 236                 /*
 237                  * When both current and HEAD are there, only
 238                  * show HEAD->current where HEAD would have
 239                  * appeared, skipping the entry for current.
 240                  */
 241                 if (decoration != current_and_HEAD) {
 242                         strbuf_addstr(sb, color_commit);
 243                         strbuf_addstr(sb, prefix);
 244                         strbuf_addstr(sb, color_reset);
 245                         strbuf_addstr(sb, decorate_get_color(use_color, decoration->type));
 246                         if (decoration->type == DECORATION_REF_TAG)
 247                                 strbuf_addstr(sb, "tag: ");
 248
 249                         strbuf_addstr(sb, decoration->name);
 250
 251                         if (current_and_HEAD &&
 252                             decoration->type == DECORATION_REF_HEAD) {
 253                                 strbuf_addstr(sb, color_reset);
 254                                 strbuf_addstr(sb, color_commit);
 255                                 strbuf_addstr(sb, " -> ");
 256                                 strbuf_addstr(sb, color_reset);
 257                                 strbuf_addstr(sb, decorate_get_color(use_color, current_and_HEAD->type));
 258                                 strbuf_addstr(sb, current_and_HEAD->name);
 259                         }
 260                         strbuf_addstr(sb, color_reset);
 261
 262                         prefix = separator;
 263                 }
 264                 decoration = decoration->next;
 265         }
 266         strbuf_addstr(sb, color_commit);
 267         strbuf_addstr(sb, suffix);
 268         strbuf_addstr(sb, color_reset);
 269 }
 270
 271 void show_decorations(struct rev_info *opt, struct commit *commit)
 272 {
 273         struct strbuf sb = STRBUF_INIT;
 274
 275         if (opt->show_source && commit->util)
 276                 printf("\t%s", (char *) commit->util);
 277         if (!opt->show_decorations)
 278                 return;
 279         format_decorations(&sb, commit, opt->diffopt.use_color);
 280         fputs(sb.buf, stdout);
 281         strbuf_release(&sb);
 282 }
 283
 284 static unsigned int digits_in_number(unsigned int number)
 285 {
 286         unsigned int i = 10, result = 1;
 287         while (i <= number) {
 288                 i *= 10;
 289                 result++;
 290         }
 291         return result;
 292 }
 293
 294 void fmt_output_subject(struct strbuf *filename,
 295                         const char *subject,
 296                         struct rev_info *info)
 297 {
 298         const char *suffix = info->patch_suffix;
 299         int nr = info->nr;
 300         int start_len = filename->len;
 301         int max_len = start_len + FORMAT_PATCH_NAME_MAX - (strlen(suffix) + 1);
 302
 303         if (0 < info->reroll_count)
 304                 strbuf_addf(filename, "v%d-", info->reroll_count);
 305         strbuf_addf(filename, "%04d-%s", nr, subject);
 306
 307         if (max_len < filename->len)
 308                 strbuf_setlen(filename, max_len);
 309         strbuf_addstr(filename, suffix);
 310 }
 311
 312 void fmt_output_commit(struct strbuf *filename,
 313                        struct commit *commit,
 314                        struct rev_info *info)
 315 {
 316         struct pretty_print_context ctx = {0};
 317         struct strbuf subject = STRBUF_INIT;
 318
 319         format_commit_message(commit, "%f", &subject, &ctx);
 320         fmt_output_subject(filename, subject.buf, info);
 321         strbuf_release(&subject);
 322 }
 323
 324 void log_write_email_headers(struct rev_info *opt, struct commit *commit,
 325                              const char **subject_p,
 326                              const char **extra_headers_p,
 327                              int *need_8bit_cte_p)
 328 {
 329         const char *subject = NULL;
 330         const char *extra_headers = opt->extra_headers;
 331         const char *name = sha1_to_hex(commit->object.sha1);
 332
 333         *need_8bit_cte_p = 0; /* unknown */
 334         if (opt->total > 0) {
 335                 static char buffer[64];
 336                 snprintf(buffer, sizeof(buffer),
 337                          "Subject: [%s%s%0*d/%d] ",
 338                          opt->subject_prefix,
 339                          *opt->subject_prefix ? " " : "",
 340                          digits_in_number(opt->total),
 341                          opt->nr, opt->total);
 342                 subject = buffer;
 343         } else if (opt->total == 0 && opt->subject_prefix && *opt->subject_prefix) {
 344                 static char buffer[256];
 345                 snprintf(buffer, sizeof(buffer),
 346                          "Subject: [%s] ",
 347                          opt->subject_prefix);
 348                 subject = buffer;
 349         } else {
 350                 subject = "Subject: ";
 351         }
 352
 353         printf("From %s Mon Sep 17 00:00:00 2001\n", name);
 354         graph_show_oneline(opt->graph);
 355         if (opt->message_id) {
 356                 printf("Message-Id: <%s>\n", opt->message_id);
 357                 graph_show_oneline(opt->graph);
 358         }
 359         if (opt->ref_message_ids && opt->ref_message_ids->nr > 0) {
 360                 int i, n;
 361                 n = opt->ref_message_ids->nr;
 362                 printf("In-Reply-To: <%s>\n", opt->ref_message_ids->items[n-1].string);
 363                 for (i = 0; i < n; i++)
 364                         printf("%s<%s>\n", (i > 0 ? "\t" : "References: "),
 365                                opt->ref_message_ids->items[i].string);
 366                 graph_show_oneline(opt->graph);
 367         }
 368         if (opt->mime_boundary) {
 369                 static char subject_buffer[1024];
 370                 static char buffer[1024];
 371                 struct strbuf filename =  STRBUF_INIT;
 372                 *need_8bit_cte_p = -1; /* NEVER */
 373                 snprintf(subject_buffer, sizeof(subject_buffer) - 1,
 374                          "%s"
 375                          "MIME-Version: 1.0\n"
 376                          "Content-Type: multipart/mixed;"
 377                          " boundary=\"%s%s\"\n"
 378                          "\n"
 379                          "This is a multi-part message in MIME "
 380                          "format.\n"
 381                          "--%s%s\n"
 382                          "Content-Type: text/plain; "
 383                          "charset=UTF-8; format=fixed\n"
 384                          "Content-Transfer-Encoding: 8bit\n\n",
 385                          extra_headers ? extra_headers : "",
 386                          mime_boundary_leader, opt->mime_boundary,
 387                          mime_boundary_leader, opt->mime_boundary);
 388                 extra_headers = subject_buffer;
 389
 390                 if (opt->numbered_files)
 391                         strbuf_addf(&filename, "%d", opt->nr);
 392                 else
 393                         fmt_output_commit(&filename, commit, opt);
 394                 snprintf(buffer, sizeof(buffer) - 1,
 395                          "\n--%s%s\n"
 396                          "Content-Type: text/x-patch;"
 397                          " name=\"%s\"\n"
 398                          "Content-Transfer-Encoding: 8bit\n"
 399                          "Content-Disposition: %s;"
 400                          " filename=\"%s\"\n\n",
 401                          mime_boundary_leader, opt->mime_boundary,
 402                          filename.buf,
 403                          opt->no_inline ? "attachment" : "inline",
 404                          filename.buf);
 405                 opt->diffopt.stat_sep = buffer;
 406                 strbuf_release(&filename);
 407         }
 408         *subject_p = subject;
 409         *extra_headers_p = extra_headers;
 410 }
 411
 412 static void show_sig_lines(struct rev_info *opt, int status, const char *bol)
 413 {
 414         const char *color, *reset, *eol;
 415
 416         color = diff_get_color_opt(&opt->diffopt,
 417                                    status ? DIFF_WHITESPACE : DIFF_FRAGINFO);
 418         reset = diff_get_color_opt(&opt->diffopt, DIFF_RESET);
 419         while (*bol) {
 420                 eol = strchrnul(bol, '\n');
 421                 printf("%s%.*s%s%s", color, (int)(eol - bol), bol, reset,
 422                        *eol ? "\n" : "");
 423                 graph_show_oneline(opt->graph);
 424                 bol = (*eol) ? (eol + 1) : eol;
 425         }
 426 }
 427
 428 static void show_signature(struct rev_info *opt, struct commit *commit)
 429 {
 430         struct strbuf payload = STRBUF_INIT;
 431         struct strbuf signature = STRBUF_INIT;
 432         struct strbuf gpg_output = STRBUF_INIT;
 433         int status;
 434
 435         if (parse_signed_commit(commit, &payload, &signature) <= 0)
 436                 goto out;
 437
 438         status = verify_signed_buffer(payload.buf, payload.len,
 439                                       signature.buf, signature.len,
 440                                       &gpg_output, NULL);
 441         if (status && !gpg_output.len)
 442                 strbuf_addstr(&gpg_output, "No signature\n");
 443
 444         show_sig_lines(opt, status, gpg_output.buf);
 445
 446  out:
 447         strbuf_release(&gpg_output);
 448         strbuf_release(&payload);
 449         strbuf_release(&signature);
 450 }
 451
 452 static int which_parent(const unsigned char *sha1, const struct commit *commit)
 453 {
 454         int nth;
 455         const struct commit_list *parent;
 456
 457         for (nth = 0, parent = commit->parents; parent; parent = parent->next) {
 458                 if (!hashcmp(parent->item->object.sha1, sha1))
 459                         return nth;
 460                 nth++;
 461         }
 462         return -1;
 463 }
 464
 465 static int is_common_merge(const struct commit *commit)
 466 {
 467         return (commit->parents
 468                 && commit->parents->next
 469                 && !commit->parents->next->next);
 470 }
 471
 472 static void show_one_mergetag(struct commit *commit,
 473                               struct commit_extra_header *extra,
 474                               void *data)
 475 {
 476         struct rev_info *opt = (struct rev_info *)data;
 477         unsigned char sha1[20];
 478         struct tag *tag;
 479         struct strbuf verify_message;
 480         int status, nth;
 481         size_t payload_size, gpg_message_offset;
 482
 483         hash_sha1_file(extra->value, extra->len, typename(OBJ_TAG), sha1);
 484         tag = lookup_tag(sha1);
 485         if (!tag)
 486                 return; /* error message already given */
 487
 488         strbuf_init(&verify_message, 256);
 489         if (parse_tag_buffer(tag, extra->value, extra->len))
 490                 strbuf_addstr(&verify_message, "malformed mergetag\n");
 491         else if (is_common_merge(commit) &&
 492                  !hashcmp(tag->tagged->sha1,
 493                           commit->parents->next->item->object.sha1))
 494                 strbuf_addf(&verify_message,
 495                             "merged tag '%s'\n", tag->tag);
 496         else if ((nth = which_parent(tag->tagged->sha1, commit)) < 0)
 497                 strbuf_addf(&verify_message, "tag %s names a non-parent %s\n",
 498                                     tag->tag, tag->tagged->sha1);
 499         else
 500                 strbuf_addf(&verify_message,
 501                             "parent #%d, tagged '%s'\n", nth + 1, tag->tag);
 502         gpg_message_offset = verify_message.len;
 503
 504         payload_size = parse_signature(extra->value, extra->len);
 505         status = -1;
 506         if (extra->len > payload_size) {
 507                 /* could have a good signature */
 508                 if (!verify_signed_buffer(extra->value, payload_size,
 509                                           extra->value + payload_size,
 510                                           extra->len - payload_size,
 511                                           &verify_message, NULL))
 512                         status = 0; /* good */
 513                 else if (verify_message.len <= gpg_message_offset)
 514                         strbuf_addstr(&verify_message, "No signature\n");
 515                 /* otherwise we couldn't verify, which is shown as bad */
 516         }
 517
 518         show_sig_lines(opt, status, verify_message.buf);
 519         strbuf_release(&verify_message);
 520 }
 521
 522 static void show_mergetag(struct rev_info *opt, struct commit *commit)
 523 {
 524         for_each_mergetag(show_one_mergetag, commit, opt);
 525 }
 526
 527 void show_log(struct rev_info *opt)
 528 {
 529         struct strbuf msgbuf = STRBUF_INIT;
 530         struct log_info *log = opt->loginfo;
 531         struct commit *commit = log->commit, *parent = log->parent;
 532         int abbrev_commit = opt->abbrev_commit ? opt->abbrev : 40;
 533         const char *extra_headers = opt->extra_headers;
 534         struct pretty_print_context ctx = {0};
 535
 536         opt->loginfo = NULL;
 537         if (!opt->verbose_header) {
 538                 graph_show_commit(opt->graph);
 539
 540                 if (!opt->graph)
 541                         put_revision_mark(opt, commit);
 542                 fputs(find_unique_abbrev(commit->object.sha1, abbrev_commit), stdout);
 543                 if (opt->print_parents)
 544                         show_parents(commit, abbrev_commit);
 545                 if (opt->children.name)
 546                         show_children(opt, commit, abbrev_commit);
 547                 show_decorations(opt, commit);
 548                 if (opt->graph && !graph_is_commit_finished(opt->graph)) {
 549                         putchar('\n');
 550                         graph_show_remainder(opt->graph);
 551                 }
 552                 putchar(opt->diffopt.line_termination);
 553                 return;
 554         }
 555
 556         /*
 557          * If use_terminator is set, we already handled any record termination
 558          * at the end of the last record.
 559          * Otherwise, add a diffopt.line_termination character before all
 560          * entries but the first.  (IOW, as a separator between entries)
 561          */
 562         if (opt->shown_one && !opt->use_terminator) {
 563                 /*
 564                  * If entries are separated by a newline, the output
 565                  * should look human-readable.  If the last entry ended
 566                  * with a newline, print the graph output before this
 567                  * newline.  Otherwise it will end up as a completely blank
 568                  * line and will look like a gap in the graph.
 569                  *
 570                  * If the entry separator is not a newline, the output is
 571                  * primarily intended for programmatic consumption, and we
 572                  * never want the extra graph output before the entry
 573                  * separator.
 574                  */
 575                 if (opt->diffopt.line_termination == '\n' &&
 576                     !opt->missing_newline)
 577                         graph_show_padding(opt->graph);
 578                 putchar(opt->diffopt.line_termination);
 579         }
 580         opt->shown_one = 1;
 581
 582         /*
 583          * If the history graph was requested,
 584          * print the graph, up to this commit's line
 585          */
 586         graph_show_commit(opt->graph);
 587
 588         /*
 589          * Print header line of header..
 590          */
 591
 592         if (opt->commit_format == CMIT_FMT_EMAIL) {
 593                 log_write_email_headers(opt, commit, &ctx.subject, &extra_headers,
 594                                         &ctx.need_8bit_cte);
 595         } else if (opt->commit_format != CMIT_FMT_USERFORMAT) {
 596                 fputs(diff_get_color_opt(&opt->diffopt, DIFF_COMMIT), stdout);
 597                 if (opt->commit_format != CMIT_FMT_ONELINE)
 598                         fputs("commit ", stdout);
 599
 600                 if (!opt->graph)
 601                         put_revision_mark(opt, commit);
 602                 fputs(find_unique_abbrev(commit->object.sha1, abbrev_commit),
 603                       stdout);
 604                 if (opt->print_parents)
 605                         show_parents(commit, abbrev_commit);
 606                 if (opt->children.name)
 607                         show_children(opt, commit, abbrev_commit);
 608                 if (parent)
 609                         printf(" (from %s)",
 610                                find_unique_abbrev(parent->object.sha1,
 611                                                   abbrev_commit));
 612                 fputs(diff_get_color_opt(&opt->diffopt, DIFF_RESET), stdout);
 613                 show_decorations(opt, commit);
 614                 if (opt->commit_format == CMIT_FMT_ONELINE) {
 615                         putchar(' ');
 616                 } else {
 617                         putchar('\n');
 618                         graph_show_oneline(opt->graph);
 619                 }
 620                 if (opt->reflog_info) {
 621                         /*
 622                          * setup_revisions() ensures that opt->reflog_info
 623                          * and opt->graph cannot both be set,
 624                          * so we don't need to worry about printing the
 625                          * graph info here.
 626                          */
 627                         show_reflog_message(opt->reflog_info,
 628                                             opt->commit_format == CMIT_FMT_ONELINE,
 629                                             opt->date_mode,
 630                                             opt->date_mode_explicit);
 631                         if (opt->commit_format == CMIT_FMT_ONELINE)
 632                                 return;
 633                 }
 634         }
 635
 636         if (opt->show_signature) {
 637                 show_signature(opt, commit);
 638                 show_mergetag(opt, commit);
 639         }
 640
 641         if (!get_cached_commit_buffer(commit, NULL))
 642                 return;
 643
 644         if (opt->show_notes) {
 645                 int raw;
 646                 struct strbuf notebuf = STRBUF_INIT;
 647
 648                 raw = (opt->commit_format == CMIT_FMT_USERFORMAT);
 649                 format_display_notes(commit->object.sha1, &notebuf,
 650                                      get_log_output_encoding(), raw);
 651                 ctx.notes_message = notebuf.len
 652                         ? strbuf_detach(&notebuf, NULL)
 653                         : xcalloc(1, 1);
 654         }
 655
 656         /*
 657          * And then the pretty-printed message itself
 658          */
 659         if (ctx.need_8bit_cte >= 0 && opt->add_signoff)
 660                 ctx.need_8bit_cte =
 661                         has_non_ascii(fmt_name(getenv("GIT_COMMITTER_NAME"),
 662                                                getenv("GIT_COMMITTER_EMAIL")));
 663         ctx.date_mode = opt->date_mode;
 664         ctx.date_mode_explicit = opt->date_mode_explicit;
 665         ctx.abbrev = opt->diffopt.abbrev;
 666         ctx.after_subject = extra_headers;
 667         ctx.preserve_subject = opt->preserve_subject;
 668         ctx.reflog_info = opt->reflog_info;
 669         ctx.fmt = opt->commit_format;
 670         ctx.mailmap = opt->mailmap;
 671         ctx.color = opt->diffopt.use_color;
 672         ctx.output_encoding = get_log_output_encoding();
 673         if (opt->from_ident.mail_begin && opt->from_ident.name_begin)
 674                 ctx.from_ident = &opt->from_ident;
 675         pretty_print_commit(&ctx, commit, &msgbuf);
 676
 677         if (opt->add_signoff)
 678                 append_signoff(&msgbuf, 0, APPEND_SIGNOFF_DEDUP);
 679
 680         if ((ctx.fmt != CMIT_FMT_USERFORMAT) &&
 681             ctx.notes_message && *ctx.notes_message) {
 682                 if (ctx.fmt == CMIT_FMT_EMAIL) {
 683                         strbuf_addstr(&msgbuf, "---\n");
 684                         opt->shown_dashes = 1;
 685                 }
 686                 strbuf_addstr(&msgbuf, ctx.notes_message);
 687         }
 688
 689         if (opt->show_log_size) {
 690                 printf("log size %i\n", (int)msgbuf.len);
 691                 graph_show_oneline(opt->graph);
 692         }
 693
 694         /*
 695          * Set opt->missing_newline if msgbuf doesn't
 696          * end in a newline (including if it is empty)
 697          */
 698         if (!msgbuf.len || msgbuf.buf[msgbuf.len - 1] != '\n')
 699                 opt->missing_newline = 1;
 700         else
 701                 opt->missing_newline = 0;
 702
 703         if (opt->graph)
 704                 graph_show_commit_msg(opt->graph, &msgbuf);
 705         else
 706                 fwrite(msgbuf.buf, sizeof(char), msgbuf.len, stdout);
 707         if (opt->use_terminator && !commit_format_is_empty(opt->commit_format)) {
 708                 if (!opt->missing_newline)
 709                         graph_show_padding(opt->graph);
 710                 putchar(opt->diffopt.line_termination);
 711         }
 712
 713         strbuf_release(&msgbuf);
 714         free(ctx.notes_message);
 715 }
 716
 717 int log_tree_diff_flush(struct rev_info *opt)
 718 {
 719         opt->shown_dashes = 0;
 720         diffcore_std(&opt->diffopt);
 721
 722         if (diff_queue_is_empty()) {
 723                 int saved_fmt = opt->diffopt.output_format;
 724                 opt->diffopt.output_format = DIFF_FORMAT_NO_OUTPUT;
 725                 diff_flush(&opt->diffopt);
 726                 opt->diffopt.output_format = saved_fmt;
 727                 return 0;
 728         }
 729
 730         if (opt->loginfo && !opt->no_commit_id) {
 731                 show_log(opt);
 732                 if ((opt->diffopt.output_format & ~DIFF_FORMAT_NO_OUTPUT) &&
 733                     opt->verbose_header &&
 734                     opt->commit_format != CMIT_FMT_ONELINE &&
 735                     !commit_format_is_empty(opt->commit_format)) {
 736                         /*
 737                          * When showing a verbose header (i.e. log message),
 738                          * and not in --pretty=oneline format, we would want
 739                          * an extra newline between the end of log and the
 740                          * diff/diffstat output for readability.
 741                          */
 742                         int pch = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_PATCH;
 743                         if (opt->diffopt.output_prefix) {
 744                                 struct strbuf *msg = NULL;
 745                                 msg = opt->diffopt.output_prefix(&opt->diffopt,
 746                                         opt->diffopt.output_prefix_data);
 747                                 fwrite(msg->buf, msg->len, 1, stdout);
 748                         }
 749
 750                         /*
 751                          * We may have shown three-dashes line early
 752                          * between notes and the log message, in which
 753                          * case we only want a blank line after the
 754                          * notes without (an extra) three-dashes line.
 755                          * Otherwise, we show the three-dashes line if
 756                          * we are showing the patch with diffstat, but
 757                          * in that case, there is no extra blank line
 758                          * after the three-dashes line.
 759                          */
 760                         if (!opt->shown_dashes &&
 761                             (pch & opt->diffopt.output_format) == pch)
 762                                 printf("---");
 763                         putchar('\n');
 764                 }
 765         }
 766         diff_flush(&opt->diffopt);
 767         return 1;
 768 }
 769
 770 static int do_diff_combined(struct rev_info *opt, struct commit *commit)
 771 {
 772         diff_tree_combined_merge(commit, opt->dense_combined_merges, opt);
 773         return !opt->loginfo;
 774 }
 775
 776 /*
 777  * Show the diff of a commit.
 778  *
 779  * Return true if we printed any log info messages
 780  */
 781 static int log_tree_diff(struct rev_info *opt, struct commit *commit, struct log_info *log)
 782 {
 783         int showed_log;
 784         struct commit_list *parents;
 785         unsigned const char *sha1;
 786
 787         if (!opt->diff && !DIFF_OPT_TST(&opt->diffopt, EXIT_WITH_STATUS))
 788                 return 0;
 789
 790         parse_commit_or_die(commit);
 791         sha1 = commit->tree->object.sha1;
 792
 793         /* Root commit? */
 794         parents = get_saved_parents(opt, commit);
 795         if (!parents) {
 796                 if (opt->show_root_diff) {
 797                         diff_root_tree_sha1(sha1, "", &opt->diffopt);
 798                         log_tree_diff_flush(opt);
 799                 }
 800                 return !opt->loginfo;
 801         }
 802
 803         /* More than one parent? */
 804         if (parents && parents->next) {
 805                 if (opt->ignore_merges)
 806                         return 0;
 807                 else if (opt->combine_merges)
 808                         return do_diff_combined(opt, commit);
 809                 else if (opt->first_parent_only) {
 810                         /*
 811                          * Generate merge log entry only for the first
 812                          * parent, showing summary diff of the others
 813                          * we merged _in_.
 814                          */
 815                         parse_commit_or_die(parents->item);
 816                         diff_tree_sha1(parents->item->tree->object.sha1,
 817                                        sha1, "", &opt->diffopt);
 818                         log_tree_diff_flush(opt);
 819                         return !opt->loginfo;
 820                 }
 821
 822                 /* If we show individual diffs, show the parent info */
 823                 log->parent = parents->item;
 824         }
 825
 826         showed_log = 0;
 827         for (;;) {
 828                 struct commit *parent = parents->item;
 829
 830                 parse_commit_or_die(parent);
 831                 diff_tree_sha1(parent->tree->object.sha1,
 832                                sha1, "", &opt->diffopt);
 833                 log_tree_diff_flush(opt);
 834
 835                 showed_log |= !opt->loginfo;
 836
 837                 /* Set up the log info for the next parent, if any.. */
 838                 parents = parents->next;
 839                 if (!parents)
 840                         break;
 841                 log->parent = parents->item;
 842                 opt->loginfo = log;
 843         }
 844         return showed_log;
 845 }
 846
 847 int log_tree_commit(struct rev_info *opt, struct commit *commit)
 848 {
 849         struct log_info log;
 850         int shown;
 851
 852         log.commit = commit;
 853         log.parent = NULL;
 854         opt->loginfo = &log;
 855
 856         if (opt->line_level_traverse)
 857                 return line_log_print(opt, commit);
 858
 859         if (opt->track_linear && !opt->linear && !opt->reverse_output_stage)
 860                 printf("\n%s\n", opt->break_bar);
 861         shown = log_tree_diff(opt, commit, &log);
 862         if (!shown && opt->loginfo && opt->always_show_header) {
 863                 log.parent = NULL;
 864                 show_log(opt);
 865                 shown = 1;
 866         }
 867         if (opt->track_linear && !opt->linear && opt->reverse_output_stage)
 868                 printf("\n%s\n", opt->break_bar);
 869         opt->loginfo = NULL;
 870         maybe_flush_or_die(stdout, "stdout");
 871         return shown;
 872 }