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
  13 struct decoration name_decoration = { "object names" };
  14
  15 enum decoration_type {
  16         DECORATION_NONE = 0,
  17         DECORATION_REF_LOCAL,
  18         DECORATION_REF_REMOTE,
  19         DECORATION_REF_TAG,
  20         DECORATION_REF_STASH,
  21         DECORATION_REF_HEAD,
  22         DECORATION_GRAFTED,
  23 };
  24
  25 static char decoration_colors[][COLOR_MAXLEN] = {
  26         GIT_COLOR_RESET,
  27         GIT_COLOR_BOLD_GREEN,   /* REF_LOCAL */
  28         GIT_COLOR_BOLD_RED,     /* REF_REMOTE */
  29         GIT_COLOR_BOLD_YELLOW,  /* REF_TAG */
  30         GIT_COLOR_BOLD_MAGENTA, /* REF_STASH */
  31         GIT_COLOR_BOLD_CYAN,    /* REF_HEAD */
  32         GIT_COLOR_BOLD_BLUE,    /* GRAFTED */
  33 };
  34
  35 static const char *decorate_get_color(int decorate_use_color, enum decoration_type ix)
  36 {
  37         if (want_color(decorate_use_color))
  38                 return decoration_colors[ix];
  39         return "";
  40 }
  41
  42 static int parse_decorate_color_slot(const char *slot)
  43 {
  44         /*
  45          * We're comparing with 'ignore-case' on
  46          * (because config.c sets them all tolower),
  47          * but let's match the letters in the literal
  48          * string values here with how they are
  49          * documented in Documentation/config.txt, for
  50          * consistency.
  51          *
  52          * We love being consistent, don't we?
  53          */
  54         if (!strcasecmp(slot, "branch"))
  55                 return DECORATION_REF_LOCAL;
  56         if (!strcasecmp(slot, "remoteBranch"))
  57                 return DECORATION_REF_REMOTE;
  58         if (!strcasecmp(slot, "tag"))
  59                 return DECORATION_REF_TAG;
  60         if (!strcasecmp(slot, "stash"))
  61                 return DECORATION_REF_STASH;
  62         if (!strcasecmp(slot, "HEAD"))
  63                 return DECORATION_REF_HEAD;
  64         return -1;
  65 }
  66
  67 int parse_decorate_color_config(const char *var, const int ofs, const char *value)
  68 {
  69         int slot = parse_decorate_color_slot(var + ofs);
  70         if (slot < 0)
  71                 return 0;
  72         if (!value)
  73                 return config_error_nonbool(var);
  74         color_parse(value, var, decoration_colors[slot]);
  75         return 0;
  76 }
  77
  78 /*
  79  * log-tree.c uses DIFF_OPT_TST for determining whether to use color
  80  * for showing the commit sha1, use the same check for --decorate
  81  */
  82 #define decorate_get_color_opt(o, ix) \
  83         decorate_get_color((o)->use_color, ix)
  84
  85 static void add_name_decoration(enum decoration_type type, const char *name, struct object *obj)
  86 {
  87         int nlen = strlen(name);
  88         struct name_decoration *res = xmalloc(sizeof(struct name_decoration) + nlen);
  89         memcpy(res->name, name, nlen + 1);
  90         res->type = type;
  91         res->next = add_decoration(&name_decoration, obj, res);
  92 }
  93
  94 static int add_ref_decoration(const char *refname, const unsigned char *sha1, int flags, void *cb_data)
  95 {
  96         struct object *obj;
  97         enum decoration_type type = DECORATION_NONE;
  98
  99         if (!prefixcmp(refname, "refs/replace/")) {
 100                 unsigned char original_sha1[20];
 101                 if (!read_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 (!prefixcmp(refname, "refs/heads/"))
 118                 type = DECORATION_REF_LOCAL;
 119         else if (!prefixcmp(refname, "refs/remotes/"))
 120                 type = DECORATION_REF_REMOTE;
 121         else if (!prefixcmp(refname, "refs/tags/"))
 122                 type = DECORATION_REF_TAG;
 123         else if (!prefixcmp(refname, "refs/stash"))
 124                 type = DECORATION_REF_STASH;
 125         else if (!prefixcmp(refname, "HEAD"))
 126                 type = DECORATION_REF_HEAD;
 127
 128         if (!cb_data || *(int *)cb_data == DECORATE_SHORT_REFS)
 129                 refname = prettify_refname(refname);
 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                 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         static int loaded;
 152         if (!loaded) {
 153                 loaded = 1;
 154                 for_each_ref(add_ref_decoration, &flags);
 155                 head_ref(add_ref_decoration, &flags);
 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 void show_decorations(struct rev_info *opt, struct commit *commit)
 178 {
 179         const char *prefix;
 180         struct name_decoration *decoration;
 181         const char *color_commit =
 182                 diff_get_color_opt(&opt->diffopt, DIFF_COMMIT);
 183         const char *color_reset =
 184                 decorate_get_color_opt(&opt->diffopt, DECORATION_NONE);
 185
 186         if (opt->show_source && commit->util)
 187                 printf("\t%s", (char *) commit->util);
 188         if (!opt->show_decorations)
 189                 return;
 190         decoration = lookup_decoration(&name_decoration, &commit->object);
 191         if (!decoration)
 192                 return;
 193         prefix = " (";
 194         while (decoration) {
 195                 printf("%s", prefix);
 196                 fputs(decorate_get_color_opt(&opt->diffopt, decoration->type),
 197                       stdout);
 198                 if (decoration->type == DECORATION_REF_TAG)
 199                         fputs("tag: ", stdout);
 200                 printf("%s", decoration->name);
 201                 fputs(color_reset, stdout);
 202                 fputs(color_commit, stdout);
 203                 prefix = ", ";
 204                 decoration = decoration->next;
 205         }
 206         putchar(')');
 207 }
 208
 209 /*
 210  * Search for "^[-A-Za-z]+: [^@]+@" pattern. It usually matches
 211  * Signed-off-by: and Acked-by: lines.
 212  */
 213 static int detect_any_signoff(char *letter, int size)
 214 {
 215         char *cp;
 216         int seen_colon = 0;
 217         int seen_at = 0;
 218         int seen_name = 0;
 219         int seen_head = 0;
 220
 221         cp = letter + size;
 222         while (letter <= --cp && *cp == '\n')
 223                 continue;
 224
 225         while (letter <= cp) {
 226                 char ch = *cp--;
 227                 if (ch == '\n')
 228                         break;
 229
 230                 if (!seen_at) {
 231                         if (ch == '@')
 232                                 seen_at = 1;
 233                         continue;
 234                 }
 235                 if (!seen_colon) {
 236                         if (ch == '@')
 237                                 return 0;
 238                         else if (ch == ':')
 239                                 seen_colon = 1;
 240                         else
 241                                 seen_name = 1;
 242                         continue;
 243                 }
 244                 if (('A' <= ch && ch <= 'Z') ||
 245                     ('a' <= ch && ch <= 'z') ||
 246                     ch == '-') {
 247                         seen_head = 1;
 248                         continue;
 249                 }
 250                 /* no empty last line doesn't match */
 251                 return 0;
 252         }
 253         return seen_head && seen_name;
 254 }
 255
 256 static void append_signoff(struct strbuf *sb, const char *signoff)
 257 {
 258         static const char signed_off_by[] = "Signed-off-by: ";
 259         size_t signoff_len = strlen(signoff);
 260         int has_signoff = 0;
 261         char *cp;
 262
 263         cp = sb->buf;
 264
 265         /* First see if we already have the sign-off by the signer */
 266         while ((cp = strstr(cp, signed_off_by))) {
 267
 268                 has_signoff = 1;
 269
 270                 cp += strlen(signed_off_by);
 271                 if (cp + signoff_len >= sb->buf + sb->len)
 272                         break;
 273                 if (strncmp(cp, signoff, signoff_len))
 274                         continue;
 275                 if (!isspace(cp[signoff_len]))
 276                         continue;
 277                 /* we already have him */
 278                 return;
 279         }
 280
 281         if (!has_signoff)
 282                 has_signoff = detect_any_signoff(sb->buf, sb->len);
 283
 284         if (!has_signoff)
 285                 strbuf_addch(sb, '\n');
 286
 287         strbuf_addstr(sb, signed_off_by);
 288         strbuf_add(sb, signoff, signoff_len);
 289         strbuf_addch(sb, '\n');
 290 }
 291
 292 static unsigned int digits_in_number(unsigned int number)
 293 {
 294         unsigned int i = 10, result = 1;
 295         while (i <= number) {
 296                 i *= 10;
 297                 result++;
 298         }
 299         return result;
 300 }
 301
 302 void get_patch_filename(struct commit *commit, int nr, const char *suffix,
 303                         struct strbuf *buf)
 304 {
 305         int suffix_len = strlen(suffix) + 1;
 306         int start_len = buf->len;
 307
 308         strbuf_addf(buf, commit ? "%04d-" : "%d", nr);
 309         if (commit) {
 310                 int max_len = start_len + FORMAT_PATCH_NAME_MAX - suffix_len;
 311                 struct pretty_print_context ctx = {0};
 312                 ctx.date_mode = DATE_NORMAL;
 313
 314                 format_commit_message(commit, "%f", buf, &ctx);
 315                 if (max_len < buf->len)
 316                         strbuf_setlen(buf, max_len);
 317                 strbuf_addstr(buf, suffix);
 318         }
 319 }
 320
 321 void log_write_email_headers(struct rev_info *opt, struct commit *commit,
 322                              const char **subject_p,
 323                              const char **extra_headers_p,
 324                              int *need_8bit_cte_p)
 325 {
 326         const char *subject = NULL;
 327         const char *extra_headers = opt->extra_headers;
 328         const char *name = sha1_to_hex(commit->object.sha1);
 329
 330         *need_8bit_cte_p = 0; /* unknown */
 331         if (opt->total > 0) {
 332                 static char buffer[64];
 333                 snprintf(buffer, sizeof(buffer),
 334                          "Subject: [%s%s%0*d/%d] ",
 335                          opt->subject_prefix,
 336                          *opt->subject_prefix ? " " : "",
 337                          digits_in_number(opt->total),
 338                          opt->nr, opt->total);
 339                 subject = buffer;
 340         } else if (opt->total == 0 && opt->subject_prefix && *opt->subject_prefix) {
 341                 static char buffer[256];
 342                 snprintf(buffer, sizeof(buffer),
 343                          "Subject: [%s] ",
 344                          opt->subject_prefix);
 345                 subject = buffer;
 346         } else {
 347                 subject = "Subject: ";
 348         }
 349
 350         printf("From %s Mon Sep 17 00:00:00 2001\n", name);
 351         graph_show_oneline(opt->graph);
 352         if (opt->message_id) {
 353                 printf("Message-Id: <%s>\n", opt->message_id);
 354                 graph_show_oneline(opt->graph);
 355         }
 356         if (opt->ref_message_ids && opt->ref_message_ids->nr > 0) {
 357                 int i, n;
 358                 n = opt->ref_message_ids->nr;
 359                 printf("In-Reply-To: <%s>\n", opt->ref_message_ids->items[n-1].string);
 360                 for (i = 0; i < n; i++)
 361                         printf("%s<%s>\n", (i > 0 ? "\t" : "References: "),
 362                                opt->ref_message_ids->items[i].string);
 363                 graph_show_oneline(opt->graph);
 364         }
 365         if (opt->mime_boundary) {
 366                 static char subject_buffer[1024];
 367                 static char buffer[1024];
 368                 struct strbuf filename =  STRBUF_INIT;
 369                 *need_8bit_cte_p = -1; /* NEVER */
 370                 snprintf(subject_buffer, sizeof(subject_buffer) - 1,
 371                          "%s"
 372                          "MIME-Version: 1.0\n"
 373                          "Content-Type: multipart/mixed;"
 374                          " boundary=\"%s%s\"\n"
 375                          "\n"
 376                          "This is a multi-part message in MIME "
 377                          "format.\n"
 378                          "--%s%s\n"
 379                          "Content-Type: text/plain; "
 380                          "charset=UTF-8; format=fixed\n"
 381                          "Content-Transfer-Encoding: 8bit\n\n",
 382                          extra_headers ? extra_headers : "",
 383                          mime_boundary_leader, opt->mime_boundary,
 384                          mime_boundary_leader, opt->mime_boundary);
 385                 extra_headers = subject_buffer;
 386
 387                 get_patch_filename(opt->numbered_files ? NULL : commit, opt->nr,
 388                                     opt->patch_suffix, &filename);
 389                 snprintf(buffer, sizeof(buffer) - 1,
 390                          "\n--%s%s\n"
 391                          "Content-Type: text/x-patch;"
 392                          " name=\"%s\"\n"
 393                          "Content-Transfer-Encoding: 8bit\n"
 394                          "Content-Disposition: %s;"
 395                          " filename=\"%s\"\n\n",
 396                          mime_boundary_leader, opt->mime_boundary,
 397                          filename.buf,
 398                          opt->no_inline ? "attachment" : "inline",
 399                          filename.buf);
 400                 opt->diffopt.stat_sep = buffer;
 401                 strbuf_release(&filename);
 402         }
 403         *subject_p = subject;
 404         *extra_headers_p = extra_headers;
 405 }
 406
 407 static void show_sig_lines(struct rev_info *opt, int status, const char *bol)
 408 {
 409         const char *color, *reset, *eol;
 410
 411         color = diff_get_color_opt(&opt->diffopt,
 412                                    status ? DIFF_WHITESPACE : DIFF_FRAGINFO);
 413         reset = diff_get_color_opt(&opt->diffopt, DIFF_RESET);
 414         while (*bol) {
 415                 eol = strchrnul(bol, '\n');
 416                 printf("%s%.*s%s%s", color, (int)(eol - bol), bol, reset,
 417                        *eol ? "\n" : "");
 418                 bol = (*eol) ? (eol + 1) : eol;
 419         }
 420 }
 421
 422 static void show_signature(struct rev_info *opt, struct commit *commit)
 423 {
 424         struct strbuf payload = STRBUF_INIT;
 425         struct strbuf signature = STRBUF_INIT;
 426         struct strbuf gpg_output = STRBUF_INIT;
 427         int status;
 428
 429         if (parse_signed_commit(commit->object.sha1, &payload, &signature) <= 0)
 430                 goto out;
 431
 432         status = verify_signed_buffer(payload.buf, payload.len,
 433                                       signature.buf, signature.len,
 434                                       &gpg_output);
 435         if (status && !gpg_output.len)
 436                 strbuf_addstr(&gpg_output, "No signature\n");
 437
 438         show_sig_lines(opt, status, gpg_output.buf);
 439
 440  out:
 441         strbuf_release(&gpg_output);
 442         strbuf_release(&payload);
 443         strbuf_release(&signature);
 444 }
 445
 446 static int which_parent(const unsigned char *sha1, const struct commit *commit)
 447 {
 448         int nth;
 449         const struct commit_list *parent;
 450
 451         for (nth = 0, parent = commit->parents; parent; parent = parent->next) {
 452                 if (!hashcmp(parent->item->object.sha1, sha1))
 453                         return nth;
 454                 nth++;
 455         }
 456         return -1;
 457 }
 458
 459 static void show_one_mergetag(struct rev_info *opt,
 460                               struct commit_extra_header *extra,
 461                               struct commit *commit)
 462 {
 463         unsigned char sha1[20];
 464         struct tag *tag;
 465         struct strbuf verify_message;
 466         int status, nth;
 467         size_t payload_size, gpg_message_offset;
 468
 469         hash_sha1_file(extra->value, extra->len, typename(OBJ_TAG), sha1);
 470         tag = lookup_tag(sha1);
 471         if (!tag)
 472                 return; /* error message already given */
 473
 474         strbuf_init(&verify_message, 256);
 475         if (parse_tag_buffer(tag, extra->value, extra->len))
 476                 strbuf_addstr(&verify_message, "malformed mergetag\n");
 477         else if ((nth = which_parent(tag->tagged->sha1, commit)) < 0)
 478                 strbuf_addf(&verify_message, "tag %s names a non-parent %s\n",
 479                                     tag->tag, tag->tagged->sha1);
 480         else
 481                 strbuf_addf(&verify_message,
 482                             "parent #%d, tagged '%s'\n", nth + 1, tag->tag);
 483         gpg_message_offset = verify_message.len;
 484
 485         payload_size = parse_signature(extra->value, extra->len);
 486         if ((extra->len <= payload_size) ||
 487             (verify_signed_buffer(extra->value, payload_size,
 488                                   extra->value + payload_size,
 489                                   extra->len - payload_size,
 490                                   &verify_message) &&
 491              verify_message.len <= gpg_message_offset)) {
 492                 strbuf_addstr(&verify_message, "No signature\n");
 493                 status = -1;
 494         }
 495         else if (strstr(verify_message.buf + gpg_message_offset,
 496                         ": Good signature from "))
 497                 status = 0;
 498         else
 499                 status = -1;
 500
 501         show_sig_lines(opt, status, verify_message.buf);
 502         strbuf_release(&verify_message);
 503 }
 504
 505 static void show_mergetag(struct rev_info *opt, struct commit *commit)
 506 {
 507         struct commit_extra_header *extra, *to_free;
 508
 509         to_free = read_commit_extra_headers(commit, NULL);
 510         for (extra = to_free; extra; extra = extra->next) {
 511                 if (strcmp(extra->key, "mergetag"))
 512                         continue; /* not a merge tag */
 513                 show_one_mergetag(opt, extra, commit);
 514         }
 515         free_commit_extra_headers(to_free);
 516 }
 517
 518 void show_log(struct rev_info *opt)
 519 {
 520         struct strbuf msgbuf = STRBUF_INIT;
 521         struct log_info *log = opt->loginfo;
 522         struct commit *commit = log->commit, *parent = log->parent;
 523         int abbrev_commit = opt->abbrev_commit ? opt->abbrev : 40;
 524         const char *extra_headers = opt->extra_headers;
 525         struct pretty_print_context ctx = {0};
 526
 527         opt->loginfo = NULL;
 528         ctx.show_notes = opt->show_notes;
 529         if (!opt->verbose_header) {
 530                 graph_show_commit(opt->graph);
 531
 532                 if (!opt->graph)
 533                         put_revision_mark(opt, commit);
 534                 fputs(find_unique_abbrev(commit->object.sha1, abbrev_commit), stdout);
 535                 if (opt->print_parents)
 536                         show_parents(commit, abbrev_commit);
 537                 if (opt->children.name)
 538                         show_children(opt, commit, abbrev_commit);
 539                 show_decorations(opt, commit);
 540                 if (opt->graph && !graph_is_commit_finished(opt->graph)) {
 541                         putchar('\n');
 542                         graph_show_remainder(opt->graph);
 543                 }
 544                 putchar(opt->diffopt.line_termination);
 545                 return;
 546         }
 547
 548         /*
 549          * If use_terminator is set, we already handled any record termination
 550          * at the end of the last record.
 551          * Otherwise, add a diffopt.line_termination character before all
 552          * entries but the first.  (IOW, as a separator between entries)
 553          */
 554         if (opt->shown_one && !opt->use_terminator) {
 555                 /*
 556                  * If entries are separated by a newline, the output
 557                  * should look human-readable.  If the last entry ended
 558                  * with a newline, print the graph output before this
 559                  * newline.  Otherwise it will end up as a completely blank
 560                  * line and will look like a gap in the graph.
 561                  *
 562                  * If the entry separator is not a newline, the output is
 563                  * primarily intended for programmatic consumption, and we
 564                  * never want the extra graph output before the entry
 565                  * separator.
 566                  */
 567                 if (opt->diffopt.line_termination == '\n' &&
 568                     !opt->missing_newline)
 569                         graph_show_padding(opt->graph);
 570                 putchar(opt->diffopt.line_termination);
 571         }
 572         opt->shown_one = 1;
 573
 574         /*
 575          * If the history graph was requested,
 576          * print the graph, up to this commit's line
 577          */
 578         graph_show_commit(opt->graph);
 579
 580         /*
 581          * Print header line of header..
 582          */
 583
 584         if (opt->commit_format == CMIT_FMT_EMAIL) {
 585                 log_write_email_headers(opt, commit, &ctx.subject, &extra_headers,
 586                                         &ctx.need_8bit_cte);
 587         } else if (opt->commit_format != CMIT_FMT_USERFORMAT) {
 588                 fputs(diff_get_color_opt(&opt->diffopt, DIFF_COMMIT), stdout);
 589                 if (opt->commit_format != CMIT_FMT_ONELINE)
 590                         fputs("commit ", stdout);
 591
 592                 if (!opt->graph)
 593                         put_revision_mark(opt, commit);
 594                 fputs(find_unique_abbrev(commit->object.sha1, abbrev_commit),
 595                       stdout);
 596                 if (opt->print_parents)
 597                         show_parents(commit, abbrev_commit);
 598                 if (opt->children.name)
 599                         show_children(opt, commit, abbrev_commit);
 600                 if (parent)
 601                         printf(" (from %s)",
 602                                find_unique_abbrev(parent->object.sha1,
 603                                                   abbrev_commit));
 604                 show_decorations(opt, commit);
 605                 printf("%s", diff_get_color_opt(&opt->diffopt, DIFF_RESET));
 606                 if (opt->commit_format == CMIT_FMT_ONELINE) {
 607                         putchar(' ');
 608                 } else {
 609                         putchar('\n');
 610                         graph_show_oneline(opt->graph);
 611                 }
 612                 if (opt->reflog_info) {
 613                         /*
 614                          * setup_revisions() ensures that opt->reflog_info
 615                          * and opt->graph cannot both be set,
 616                          * so we don't need to worry about printing the
 617                          * graph info here.
 618                          */
 619                         show_reflog_message(opt->reflog_info,
 620                                     opt->commit_format == CMIT_FMT_ONELINE,
 621                                     opt->date_mode_explicit ?
 622                                         opt->date_mode :
 623                                         DATE_NORMAL);
 624                         if (opt->commit_format == CMIT_FMT_ONELINE)
 625                                 return;
 626                 }
 627         }
 628
 629         if (opt->show_signature) {
 630                 show_signature(opt, commit);
 631                 show_mergetag(opt, commit);
 632         }
 633
 634         if (!commit->buffer)
 635                 return;
 636
 637         /*
 638          * And then the pretty-printed message itself
 639          */
 640         if (ctx.need_8bit_cte >= 0)
 641                 ctx.need_8bit_cte = has_non_ascii(opt->add_signoff);
 642         ctx.date_mode = opt->date_mode;
 643         ctx.abbrev = opt->diffopt.abbrev;
 644         ctx.after_subject = extra_headers;
 645         ctx.preserve_subject = opt->preserve_subject;
 646         ctx.reflog_info = opt->reflog_info;
 647         ctx.fmt = opt->commit_format;
 648         pretty_print_commit(&ctx, commit, &msgbuf);
 649
 650         if (opt->add_signoff)
 651                 append_signoff(&msgbuf, opt->add_signoff);
 652         if (opt->show_log_size) {
 653                 printf("log size %i\n", (int)msgbuf.len);
 654                 graph_show_oneline(opt->graph);
 655         }
 656
 657         /*
 658          * Set opt->missing_newline if msgbuf doesn't
 659          * end in a newline (including if it is empty)
 660          */
 661         if (!msgbuf.len || msgbuf.buf[msgbuf.len - 1] != '\n')
 662                 opt->missing_newline = 1;
 663         else
 664                 opt->missing_newline = 0;
 665
 666         if (opt->graph)
 667                 graph_show_commit_msg(opt->graph, &msgbuf);
 668         else
 669                 fwrite(msgbuf.buf, sizeof(char), msgbuf.len, stdout);
 670         if (opt->use_terminator) {
 671                 if (!opt->missing_newline)
 672                         graph_show_padding(opt->graph);
 673                 putchar('\n');
 674         }
 675
 676         strbuf_release(&msgbuf);
 677 }
 678
 679 int log_tree_diff_flush(struct rev_info *opt)
 680 {
 681         diffcore_std(&opt->diffopt);
 682
 683         if (diff_queue_is_empty()) {
 684                 int saved_fmt = opt->diffopt.output_format;
 685                 opt->diffopt.output_format = DIFF_FORMAT_NO_OUTPUT;
 686                 diff_flush(&opt->diffopt);
 687                 opt->diffopt.output_format = saved_fmt;
 688                 return 0;
 689         }
 690
 691         if (opt->loginfo && !opt->no_commit_id) {
 692                 /* When showing a verbose header (i.e. log message),
 693                  * and not in --pretty=oneline format, we would want
 694                  * an extra newline between the end of log and the
 695                  * output for readability.
 696                  */
 697                 show_log(opt);
 698                 if ((opt->diffopt.output_format & ~DIFF_FORMAT_NO_OUTPUT) &&
 699                     opt->verbose_header &&
 700                     opt->commit_format != CMIT_FMT_ONELINE) {
 701                         int pch = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_PATCH;
 702                         if ((pch & opt->diffopt.output_format) == pch)
 703                                 printf("---");
 704                         if (opt->diffopt.output_prefix) {
 705                                 struct strbuf *msg = NULL;
 706                                 msg = opt->diffopt.output_prefix(&opt->diffopt,
 707                                         opt->diffopt.output_prefix_data);
 708                                 fwrite(msg->buf, msg->len, 1, stdout);
 709                         }
 710                         putchar('\n');
 711                 }
 712         }
 713         diff_flush(&opt->diffopt);
 714         return 1;
 715 }
 716
 717 static int do_diff_combined(struct rev_info *opt, struct commit *commit)
 718 {
 719         unsigned const char *sha1 = commit->object.sha1;
 720
 721         diff_tree_combined_merge(sha1, opt->dense_combined_merges, opt);
 722         return !opt->loginfo;
 723 }
 724
 725 /*
 726  * Show the diff of a commit.
 727  *
 728  * Return true if we printed any log info messages
 729  */
 730 static int log_tree_diff(struct rev_info *opt, struct commit *commit, struct log_info *log)
 731 {
 732         int showed_log;
 733         struct commit_list *parents;
 734         unsigned const char *sha1 = commit->object.sha1;
 735
 736         if (!opt->diff && !DIFF_OPT_TST(&opt->diffopt, EXIT_WITH_STATUS))
 737                 return 0;
 738
 739         /* Root commit? */
 740         parents = commit->parents;
 741         if (!parents) {
 742                 if (opt->show_root_diff) {
 743                         diff_root_tree_sha1(sha1, "", &opt->diffopt);
 744                         log_tree_diff_flush(opt);
 745                 }
 746                 return !opt->loginfo;
 747         }
 748
 749         /* More than one parent? */
 750         if (parents && parents->next) {
 751                 if (opt->ignore_merges)
 752                         return 0;
 753                 else if (opt->combine_merges)
 754                         return do_diff_combined(opt, commit);
 755                 else if (opt->first_parent_only) {
 756                         /*
 757                          * Generate merge log entry only for the first
 758                          * parent, showing summary diff of the others
 759                          * we merged _in_.
 760                          */
 761                         diff_tree_sha1(parents->item->object.sha1, sha1, "", &opt->diffopt);
 762                         log_tree_diff_flush(opt);
 763                         return !opt->loginfo;
 764                 }
 765
 766                 /* If we show individual diffs, show the parent info */
 767                 log->parent = parents->item;
 768         }
 769
 770         showed_log = 0;
 771         for (;;) {
 772                 struct commit *parent = parents->item;
 773
 774                 diff_tree_sha1(parent->object.sha1, sha1, "", &opt->diffopt);
 775                 log_tree_diff_flush(opt);
 776
 777                 showed_log |= !opt->loginfo;
 778
 779                 /* Set up the log info for the next parent, if any.. */
 780                 parents = parents->next;
 781                 if (!parents)
 782                         break;
 783                 log->parent = parents->item;
 784                 opt->loginfo = log;
 785         }
 786         return showed_log;
 787 }
 788
 789 int log_tree_commit(struct rev_info *opt, struct commit *commit)
 790 {
 791         struct log_info log;
 792         int shown;
 793
 794         log.commit = commit;
 795         log.parent = NULL;
 796         opt->loginfo = &log;
 797
 798         shown = log_tree_diff(opt, commit, &log);
 799         if (!shown && opt->loginfo && opt->always_show_header) {
 800                 log.parent = NULL;
 801                 show_log(opt);
 802                 shown = 1;
 803         }
 804         opt->loginfo = NULL;
 805         maybe_flush_or_die(stdout, "stdout");
 806         return shown;
 807 }