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         struct name_decoration *res;
  81         FLEX_ALLOC_STR(res, name, name);
  82         res->type = type;
  83         res->next = add_decoration(&name_decoration, obj, res);
  84 }
  85
  86 const struct name_decoration *get_name_decoration(const struct object *obj)
  87 {
  88         return lookup_decoration(&name_decoration, obj);
  89 }
  90
  91 static int add_ref_decoration(const char *refname, const struct object_id *oid,
  92                               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, git_replace_ref_base)) {
 100                 struct object_id original_oid;
 101                 if (!check_replace_refs)
 102                         return 0;
 103                 if (get_oid_hex(refname + strlen(git_replace_ref_base),
 104                                 &original_oid)) {
 105                         warning("invalid replace ref %s", refname);
 106                         return 0;
 107                 }
 108                 obj = parse_object(original_oid.hash);
 109                 if (obj)
 110                         add_name_decoration(DECORATION_GRAFTED, "replaced", obj);
 111                 return 0;
 112         }
 113
 114         obj = parse_object(oid->hash);
 115         if (!obj)
 116                 return 0;
 117
 118         if (starts_with(refname, "refs/heads/"))
 119                 type = DECORATION_REF_LOCAL;
 120         else if (starts_with(refname, "refs/remotes/"))
 121                 type = DECORATION_REF_REMOTE;
 122         else if (starts_with(refname, "refs/tags/"))
 123                 type = DECORATION_REF_TAG;
 124         else if (!strcmp(refname, "refs/stash"))
 125                 type = DECORATION_REF_STASH;
 126         else if (!strcmp(refname, "HEAD"))
 127                 type = DECORATION_REF_HEAD;
 128
 129         add_name_decoration(type, refname, obj);
 130         while (obj->type == OBJ_TAG) {
 131                 obj = ((struct tag *)obj)->tagged;
 132                 if (!obj)
 133                         break;
 134                 if (!obj->parsed)
 135                         parse_object(obj->oid.hash);
 136                 add_name_decoration(DECORATION_REF_TAG, refname, obj);
 137         }
 138         return 0;
 139 }
 140
 141 static int add_graft_decoration(const struct commit_graft *graft, void *cb_data)
 142 {
 143         struct commit *commit = lookup_commit(&graft->oid);
 144         if (!commit)
 145                 return 0;
 146         add_name_decoration(DECORATION_GRAFTED, "grafted", &commit->object);
 147         return 0;
 148 }
 149
 150 void load_ref_decorations(int flags)
 151 {
 152         if (!decoration_loaded) {
 153
 154                 decoration_loaded = 1;
 155                 decoration_flags = flags;
 156                 for_each_ref(add_ref_decoration, NULL);
 157                 head_ref(add_ref_decoration, NULL);
 158                 for_each_commit_graft(add_graft_decoration, NULL);
 159         }
 160 }
 161
 162 static void show_parents(struct commit *commit, int abbrev, FILE *file)
 163 {
 164         struct commit_list *p;
 165         for (p = commit->parents; p ; p = p->next) {
 166                 struct commit *parent = p->item;
 167                 fprintf(file, " %s", find_unique_abbrev(parent->object.oid.hash, abbrev));
 168         }
 169 }
 170
 171 static void show_children(struct rev_info *opt, struct commit *commit, int abbrev)
 172 {
 173         struct commit_list *p = lookup_decoration(&opt->children, &commit->object);
 174         for ( ; p; p = p->next) {
 175                 fprintf(opt->diffopt.file, " %s", find_unique_abbrev(p->item->object.oid.hash, abbrev));
 176         }
 177 }
 178
 179 /*
 180  * Do we have HEAD in the output, and also the branch it points at?
 181  * If so, find that decoration entry for that current branch.
 182  */
 183 static const struct name_decoration *current_pointed_by_HEAD(const struct name_decoration *decoration)
 184 {
 185         const struct name_decoration *list, *head = NULL;
 186         const char *branch_name = NULL;
 187         struct object_id unused;
 188         int rru_flags;
 189
 190         /* First find HEAD */
 191         for (list = decoration; list; list = list->next)
 192                 if (list->type == DECORATION_REF_HEAD) {
 193                         head = list;
 194                         break;
 195                 }
 196         if (!head)
 197                 return NULL;
 198
 199         /* Now resolve and find the matching current branch */
 200         branch_name = resolve_ref_unsafe("HEAD", 0, unused.hash, &rru_flags);
 201         if (!(rru_flags & REF_ISSYMREF))
 202                 return NULL;
 203
 204         if (!starts_with(branch_name, "refs/"))
 205                 return NULL;
 206
 207         /* OK, do we have that ref in the list? */
 208         for (list = decoration; list; list = list->next)
 209                 if ((list->type == DECORATION_REF_LOCAL) &&
 210                     !strcmp(branch_name, list->name)) {
 211                         return list;
 212                 }
 213
 214         return NULL;
 215 }
 216
 217 static void show_name(struct strbuf *sb, const struct name_decoration *decoration)
 218 {
 219         if (decoration_flags == DECORATE_SHORT_REFS)
 220                 strbuf_addstr(sb, prettify_refname(decoration->name));
 221         else
 222                 strbuf_addstr(sb, decoration->name);
 223 }
 224
 225 /*
 226  * The caller makes sure there is no funny color before calling.
 227  * format_decorations_extended makes sure the same after return.
 228  */
 229 void format_decorations_extended(struct strbuf *sb,
 230                         const struct commit *commit,
 231                         int use_color,
 232                         const char *prefix,
 233                         const char *separator,
 234                         const char *suffix)
 235 {
 236         const struct name_decoration *decoration;
 237         const struct name_decoration *current_and_HEAD;
 238         const char *color_commit =
 239                 diff_get_color(use_color, DIFF_COMMIT);
 240         const char *color_reset =
 241                 decorate_get_color(use_color, DECORATION_NONE);
 242
 243         decoration = get_name_decoration(&commit->object);
 244         if (!decoration)
 245                 return;
 246
 247         current_and_HEAD = current_pointed_by_HEAD(decoration);
 248         while (decoration) {
 249                 /*
 250                  * When both current and HEAD are there, only
 251                  * show HEAD->current where HEAD would have
 252                  * appeared, skipping the entry for current.
 253                  */
 254                 if (decoration != current_and_HEAD) {
 255                         strbuf_addstr(sb, color_commit);
 256                         strbuf_addstr(sb, prefix);
 257                         strbuf_addstr(sb, color_reset);
 258                         strbuf_addstr(sb, decorate_get_color(use_color, decoration->type));
 259                         if (decoration->type == DECORATION_REF_TAG)
 260                                 strbuf_addstr(sb, "tag: ");
 261
 262                         show_name(sb, decoration);
 263
 264                         if (current_and_HEAD &&
 265                             decoration->type == DECORATION_REF_HEAD) {
 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                 fprintf(opt->diffopt.file, "\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, opt->diffopt.file);
 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 fmt_output_email_subject(struct strbuf *sb, struct rev_info *opt)
 336 {
 337         if (opt->total > 0) {
 338                 strbuf_addf(sb, "Subject: [%s%s%0*d/%d] ",
 339                             opt->subject_prefix,
 340                             *opt->subject_prefix ? " " : "",
 341                             digits_in_number(opt->total),
 342                             opt->nr, opt->total);
 343         } else if (opt->total == 0 && opt->subject_prefix && *opt->subject_prefix) {
 344                 strbuf_addf(sb, "Subject: [%s] ",
 345                             opt->subject_prefix);
 346         } else {
 347                 strbuf_addstr(sb, "Subject: ");
 348         }
 349 }
 350
 351 void log_write_email_headers(struct rev_info *opt, struct commit *commit,
 352                              const char **extra_headers_p,
 353                              int *need_8bit_cte_p)
 354 {
 355         const char *extra_headers = opt->extra_headers;
 356         const char *name = oid_to_hex(opt->zero_commit ?
 357                                       &null_oid : &commit->object.oid);
 358
 359         *need_8bit_cte_p = 0; /* unknown */
 360
 361         fprintf(opt->diffopt.file, "From %s Mon Sep 17 00:00:00 2001\n", name);
 362         graph_show_oneline(opt->graph);
 363         if (opt->message_id) {
 364                 fprintf(opt->diffopt.file, "Message-Id: <%s>\n", opt->message_id);
 365                 graph_show_oneline(opt->graph);
 366         }
 367         if (opt->ref_message_ids && opt->ref_message_ids->nr > 0) {
 368                 int i, n;
 369                 n = opt->ref_message_ids->nr;
 370                 fprintf(opt->diffopt.file, "In-Reply-To: <%s>\n", opt->ref_message_ids->items[n-1].string);
 371                 for (i = 0; i < n; i++)
 372                         fprintf(opt->diffopt.file, "%s<%s>\n", (i > 0 ? "\t" : "References: "),
 373                                opt->ref_message_ids->items[i].string);
 374                 graph_show_oneline(opt->graph);
 375         }
 376         if (opt->mime_boundary) {
 377                 static char subject_buffer[1024];
 378                 static char buffer[1024];
 379                 struct strbuf filename =  STRBUF_INIT;
 380                 *need_8bit_cte_p = -1; /* NEVER */
 381                 snprintf(subject_buffer, sizeof(subject_buffer) - 1,
 382                          "%s"
 383                          "MIME-Version: 1.0\n"
 384                          "Content-Type: multipart/mixed;"
 385                          " boundary=\"%s%s\"\n"
 386                          "\n"
 387                          "This is a multi-part message in MIME "
 388                          "format.\n"
 389                          "--%s%s\n"
 390                          "Content-Type: text/plain; "
 391                          "charset=UTF-8; format=fixed\n"
 392                          "Content-Transfer-Encoding: 8bit\n\n",
 393                          extra_headers ? extra_headers : "",
 394                          mime_boundary_leader, opt->mime_boundary,
 395                          mime_boundary_leader, opt->mime_boundary);
 396                 extra_headers = subject_buffer;
 397
 398                 if (opt->numbered_files)
 399                         strbuf_addf(&filename, "%d", opt->nr);
 400                 else
 401                         fmt_output_commit(&filename, commit, opt);
 402                 snprintf(buffer, sizeof(buffer) - 1,
 403                          "\n--%s%s\n"
 404                          "Content-Type: text/x-patch;"
 405                          " name=\"%s\"\n"
 406                          "Content-Transfer-Encoding: 8bit\n"
 407                          "Content-Disposition: %s;"
 408                          " filename=\"%s\"\n\n",
 409                          mime_boundary_leader, opt->mime_boundary,
 410                          filename.buf,
 411                          opt->no_inline ? "attachment" : "inline",
 412                          filename.buf);
 413                 opt->diffopt.stat_sep = buffer;
 414                 strbuf_release(&filename);
 415         }
 416         *extra_headers_p = extra_headers;
 417 }
 418
 419 static void show_sig_lines(struct rev_info *opt, int status, const char *bol)
 420 {
 421         const char *color, *reset, *eol;
 422
 423         color = diff_get_color_opt(&opt->diffopt,
 424                                    status ? DIFF_WHITESPACE : DIFF_FRAGINFO);
 425         reset = diff_get_color_opt(&opt->diffopt, DIFF_RESET);
 426         while (*bol) {
 427                 eol = strchrnul(bol, '\n');
 428                 fprintf(opt->diffopt.file, "%s%.*s%s%s", color, (int)(eol - bol), bol, reset,
 429                        *eol ? "\n" : "");
 430                 graph_show_oneline(opt->graph);
 431                 bol = (*eol) ? (eol + 1) : eol;
 432         }
 433 }
 434
 435 static void show_signature(struct rev_info *opt, struct commit *commit)
 436 {
 437         struct strbuf payload = STRBUF_INIT;
 438         struct strbuf signature = STRBUF_INIT;
 439         struct strbuf gpg_output = STRBUF_INIT;
 440         int status;
 441
 442         if (parse_signed_commit(commit, &payload, &signature) <= 0)
 443                 goto out;
 444
 445         status = verify_signed_buffer(payload.buf, payload.len,
 446                                       signature.buf, signature.len,
 447                                       &gpg_output, NULL);
 448         if (status && !gpg_output.len)
 449                 strbuf_addstr(&gpg_output, "No signature\n");
 450
 451         show_sig_lines(opt, status, gpg_output.buf);
 452
 453  out:
 454         strbuf_release(&gpg_output);
 455         strbuf_release(&payload);
 456         strbuf_release(&signature);
 457 }
 458
 459 static int which_parent(const struct object_id *oid, const struct commit *commit)
 460 {
 461         int nth;
 462         const struct commit_list *parent;
 463
 464         for (nth = 0, parent = commit->parents; parent; parent = parent->next) {
 465                 if (!oidcmp(&parent->item->object.oid, oid))
 466                         return nth;
 467                 nth++;
 468         }
 469         return -1;
 470 }
 471
 472 static int is_common_merge(const struct commit *commit)
 473 {
 474         return (commit->parents
 475                 && commit->parents->next
 476                 && !commit->parents->next->next);
 477 }
 478
 479 static void show_one_mergetag(struct commit *commit,
 480                               struct commit_extra_header *extra,
 481                               void *data)
 482 {
 483         struct rev_info *opt = (struct rev_info *)data;
 484         struct object_id oid;
 485         struct tag *tag;
 486         struct strbuf verify_message;
 487         int status, nth;
 488         size_t payload_size, gpg_message_offset;
 489
 490         hash_sha1_file(extra->value, extra->len, typename(OBJ_TAG), oid.hash);
 491         tag = lookup_tag(&oid);
 492         if (!tag)
 493                 return; /* error message already given */
 494
 495         strbuf_init(&verify_message, 256);
 496         if (parse_tag_buffer(tag, extra->value, extra->len))
 497                 strbuf_addstr(&verify_message, "malformed mergetag\n");
 498         else if (is_common_merge(commit) &&
 499                  !oidcmp(&tag->tagged->oid,
 500                           &commit->parents->next->item->object.oid))
 501                 strbuf_addf(&verify_message,
 502                             "merged tag '%s'\n", tag->tag);
 503         else if ((nth = which_parent(&tag->tagged->oid, commit)) < 0)
 504                 strbuf_addf(&verify_message, "tag %s names a non-parent %s\n",
 505                                     tag->tag, tag->tagged->oid.hash);
 506         else
 507                 strbuf_addf(&verify_message,
 508                             "parent #%d, tagged '%s'\n", nth + 1, tag->tag);
 509         gpg_message_offset = verify_message.len;
 510
 511         payload_size = parse_signature(extra->value, extra->len);
 512         status = -1;
 513         if (extra->len > payload_size) {
 514                 /* could have a good signature */
 515                 if (!verify_signed_buffer(extra->value, payload_size,
 516                                           extra->value + payload_size,
 517                                           extra->len - payload_size,
 518                                           &verify_message, NULL))
 519                         status = 0; /* good */
 520                 else if (verify_message.len <= gpg_message_offset)
 521                         strbuf_addstr(&verify_message, "No signature\n");
 522                 /* otherwise we couldn't verify, which is shown as bad */
 523         }
 524
 525         show_sig_lines(opt, status, verify_message.buf);
 526         strbuf_release(&verify_message);
 527 }
 528
 529 static void show_mergetag(struct rev_info *opt, struct commit *commit)
 530 {
 531         for_each_mergetag(show_one_mergetag, commit, opt);
 532 }
 533
 534 void show_log(struct rev_info *opt)
 535 {
 536         struct strbuf msgbuf = STRBUF_INIT;
 537         struct log_info *log = opt->loginfo;
 538         struct commit *commit = log->commit, *parent = log->parent;
 539         int abbrev_commit = opt->abbrev_commit ? opt->abbrev : GIT_SHA1_HEXSZ;
 540         const char *extra_headers = opt->extra_headers;
 541         struct pretty_print_context ctx = {0};
 542
 543         opt->loginfo = NULL;
 544         if (!opt->verbose_header) {
 545                 graph_show_commit(opt->graph);
 546
 547                 if (!opt->graph)
 548                         put_revision_mark(opt, commit);
 549                 fputs(find_unique_abbrev(commit->object.oid.hash, abbrev_commit), opt->diffopt.file);
 550                 if (opt->print_parents)
 551                         show_parents(commit, abbrev_commit, opt->diffopt.file);
 552                 if (opt->children.name)
 553                         show_children(opt, commit, abbrev_commit);
 554                 show_decorations(opt, commit);
 555                 if (opt->graph && !graph_is_commit_finished(opt->graph)) {
 556                         putc('\n', opt->diffopt.file);
 557                         graph_show_remainder(opt->graph);
 558                 }
 559                 putc(opt->diffopt.line_termination, opt->diffopt.file);
 560                 return;
 561         }
 562
 563         /*
 564          * If use_terminator is set, we already handled any record termination
 565          * at the end of the last record.
 566          * Otherwise, add a diffopt.line_termination character before all
 567          * entries but the first.  (IOW, as a separator between entries)
 568          */
 569         if (opt->shown_one && !opt->use_terminator) {
 570                 /*
 571                  * If entries are separated by a newline, the output
 572                  * should look human-readable.  If the last entry ended
 573                  * with a newline, print the graph output before this
 574                  * newline.  Otherwise it will end up as a completely blank
 575                  * line and will look like a gap in the graph.
 576                  *
 577                  * If the entry separator is not a newline, the output is
 578                  * primarily intended for programmatic consumption, and we
 579                  * never want the extra graph output before the entry
 580                  * separator.
 581                  */
 582                 if (opt->diffopt.line_termination == '\n' &&
 583                     !opt->missing_newline)
 584                         graph_show_padding(opt->graph);
 585                 putc(opt->diffopt.line_termination, opt->diffopt.file);
 586         }
 587         opt->shown_one = 1;
 588
 589         /*
 590          * If the history graph was requested,
 591          * print the graph, up to this commit's line
 592          */
 593         graph_show_commit(opt->graph);
 594
 595         /*
 596          * Print header line of header..
 597          */
 598
 599         if (cmit_fmt_is_mail(opt->commit_format)) {
 600                 log_write_email_headers(opt, commit, &extra_headers,
 601                                         &ctx.need_8bit_cte);
 602                 ctx.rev = opt;
 603                 ctx.print_email_subject = 1;
 604         } else if (opt->commit_format != CMIT_FMT_USERFORMAT) {
 605                 fputs(diff_get_color_opt(&opt->diffopt, DIFF_COMMIT), opt->diffopt.file);
 606                 if (opt->commit_format != CMIT_FMT_ONELINE)
 607                         fputs("commit ", opt->diffopt.file);
 608
 609                 if (!opt->graph)
 610                         put_revision_mark(opt, commit);
 611                 fputs(find_unique_abbrev(commit->object.oid.hash, abbrev_commit),
 612                       opt->diffopt.file);
 613                 if (opt->print_parents)
 614                         show_parents(commit, abbrev_commit, opt->diffopt.file);
 615                 if (opt->children.name)
 616                         show_children(opt, commit, abbrev_commit);
 617                 if (parent)
 618                         fprintf(opt->diffopt.file, " (from %s)",
 619                                find_unique_abbrev(parent->object.oid.hash,
 620                                                   abbrev_commit));
 621                 fputs(diff_get_color_opt(&opt->diffopt, DIFF_RESET), opt->diffopt.file);
 622                 show_decorations(opt, commit);
 623                 if (opt->commit_format == CMIT_FMT_ONELINE) {
 624                         putc(' ', opt->diffopt.file);
 625                 } else {
 626                         putc('\n', opt->diffopt.file);
 627                         graph_show_oneline(opt->graph);
 628                 }
 629                 if (opt->reflog_info) {
 630                         /*
 631                          * setup_revisions() ensures that opt->reflog_info
 632                          * and opt->graph cannot both be set,
 633                          * so we don't need to worry about printing the
 634                          * graph info here.
 635                          */
 636                         show_reflog_message(opt->reflog_info,
 637                                             opt->commit_format == CMIT_FMT_ONELINE,
 638                                             &opt->date_mode,
 639                                             opt->date_mode_explicit);
 640                         if (opt->commit_format == CMIT_FMT_ONELINE)
 641                                 return;
 642                 }
 643         }
 644
 645         if (opt->show_signature) {
 646                 show_signature(opt, commit);
 647                 show_mergetag(opt, commit);
 648         }
 649
 650         if (!get_cached_commit_buffer(commit, NULL))
 651                 return;
 652
 653         if (opt->show_notes) {
 654                 int raw;
 655                 struct strbuf notebuf = STRBUF_INIT;
 656
 657                 raw = (opt->commit_format == CMIT_FMT_USERFORMAT);
 658                 format_display_notes(commit->object.oid.hash, &notebuf,
 659                                      get_log_output_encoding(), raw);
 660                 ctx.notes_message = notebuf.len
 661                         ? strbuf_detach(&notebuf, NULL)
 662                         : xcalloc(1, 1);
 663         }
 664
 665         /*
 666          * And then the pretty-printed message itself
 667          */
 668         if (ctx.need_8bit_cte >= 0 && opt->add_signoff)
 669                 ctx.need_8bit_cte =
 670                         has_non_ascii(fmt_name(getenv("GIT_COMMITTER_NAME"),
 671                                                getenv("GIT_COMMITTER_EMAIL")));
 672         ctx.date_mode = opt->date_mode;
 673         ctx.date_mode_explicit = opt->date_mode_explicit;
 674         ctx.abbrev = opt->diffopt.abbrev;
 675         ctx.after_subject = extra_headers;
 676         ctx.preserve_subject = opt->preserve_subject;
 677         ctx.reflog_info = opt->reflog_info;
 678         ctx.fmt = opt->commit_format;
 679         ctx.mailmap = opt->mailmap;
 680         ctx.color = opt->diffopt.use_color;
 681         ctx.expand_tabs_in_log = opt->expand_tabs_in_log;
 682         ctx.output_encoding = get_log_output_encoding();
 683         if (opt->from_ident.mail_begin && opt->from_ident.name_begin)
 684                 ctx.from_ident = &opt->from_ident;
 685         if (opt->graph)
 686                 ctx.graph_width = graph_width(opt->graph);
 687         pretty_print_commit(&ctx, commit, &msgbuf);
 688
 689         if (opt->add_signoff)
 690                 append_signoff(&msgbuf, 0, APPEND_SIGNOFF_DEDUP);
 691
 692         if ((ctx.fmt != CMIT_FMT_USERFORMAT) &&
 693             ctx.notes_message && *ctx.notes_message) {
 694                 if (cmit_fmt_is_mail(ctx.fmt)) {
 695                         strbuf_addstr(&msgbuf, "---\n");
 696                         opt->shown_dashes = 1;
 697                 }
 698                 strbuf_addstr(&msgbuf, ctx.notes_message);
 699         }
 700
 701         if (opt->show_log_size) {
 702                 fprintf(opt->diffopt.file, "log size %i\n", (int)msgbuf.len);
 703                 graph_show_oneline(opt->graph);
 704         }
 705
 706         /*
 707          * Set opt->missing_newline if msgbuf doesn't
 708          * end in a newline (including if it is empty)
 709          */
 710         if (!msgbuf.len || msgbuf.buf[msgbuf.len - 1] != '\n')
 711                 opt->missing_newline = 1;
 712         else
 713                 opt->missing_newline = 0;
 714
 715         graph_show_commit_msg(opt->graph, opt->diffopt.file, &msgbuf);
 716         if (opt->use_terminator && !commit_format_is_empty(opt->commit_format)) {
 717                 if (!opt->missing_newline)
 718                         graph_show_padding(opt->graph);
 719                 putc(opt->diffopt.line_termination, opt->diffopt.file);
 720         }
 721
 722         strbuf_release(&msgbuf);
 723         free(ctx.notes_message);
 724 }
 725
 726 int log_tree_diff_flush(struct rev_info *opt)
 727 {
 728         opt->shown_dashes = 0;
 729         diffcore_std(&opt->diffopt);
 730
 731         if (diff_queue_is_empty()) {
 732                 int saved_fmt = opt->diffopt.output_format;
 733                 opt->diffopt.output_format = DIFF_FORMAT_NO_OUTPUT;
 734                 diff_flush(&opt->diffopt);
 735                 opt->diffopt.output_format = saved_fmt;
 736                 return 0;
 737         }
 738
 739         if (opt->loginfo && !opt->no_commit_id) {
 740                 show_log(opt);
 741                 if ((opt->diffopt.output_format & ~DIFF_FORMAT_NO_OUTPUT) &&
 742                     opt->verbose_header &&
 743                     opt->commit_format != CMIT_FMT_ONELINE &&
 744                     !commit_format_is_empty(opt->commit_format)) {
 745                         /*
 746                          * When showing a verbose header (i.e. log message),
 747                          * and not in --pretty=oneline format, we would want
 748                          * an extra newline between the end of log and the
 749                          * diff/diffstat output for readability.
 750                          */
 751                         int pch = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_PATCH;
 752                         if (opt->diffopt.output_prefix) {
 753                                 struct strbuf *msg = NULL;
 754                                 msg = opt->diffopt.output_prefix(&opt->diffopt,
 755                                         opt->diffopt.output_prefix_data);
 756                                 fwrite(msg->buf, msg->len, 1, opt->diffopt.file);
 757                         }
 758
 759                         /*
 760                          * We may have shown three-dashes line early
 761                          * between notes and the log message, in which
 762                          * case we only want a blank line after the
 763                          * notes without (an extra) three-dashes line.
 764                          * Otherwise, we show the three-dashes line if
 765                          * we are showing the patch with diffstat, but
 766                          * in that case, there is no extra blank line
 767                          * after the three-dashes line.
 768                          */
 769                         if (!opt->shown_dashes &&
 770                             (pch & opt->diffopt.output_format) == pch)
 771                                 fprintf(opt->diffopt.file, "---");
 772                         putc('\n', opt->diffopt.file);
 773                 }
 774         }
 775         diff_flush(&opt->diffopt);
 776         return 1;
 777 }
 778
 779 static int do_diff_combined(struct rev_info *opt, struct commit *commit)
 780 {
 781         diff_tree_combined_merge(commit, opt->dense_combined_merges, opt);
 782         return !opt->loginfo;
 783 }
 784
 785 /*
 786  * Show the diff of a commit.
 787  *
 788  * Return true if we printed any log info messages
 789  */
 790 static int log_tree_diff(struct rev_info *opt, struct commit *commit, struct log_info *log)
 791 {
 792         int showed_log;
 793         struct commit_list *parents;
 794         struct object_id *oid;
 795
 796         if (!opt->diff && !DIFF_OPT_TST(&opt->diffopt, EXIT_WITH_STATUS))
 797                 return 0;
 798
 799         parse_commit_or_die(commit);
 800         oid = &commit->tree->object.oid;
 801
 802         /* Root commit? */
 803         parents = get_saved_parents(opt, commit);
 804         if (!parents) {
 805                 if (opt->show_root_diff) {
 806                         diff_root_tree_sha1(oid->hash, "", &opt->diffopt);
 807                         log_tree_diff_flush(opt);
 808                 }
 809                 return !opt->loginfo;
 810         }
 811
 812         /* More than one parent? */
 813         if (parents && parents->next) {
 814                 if (opt->ignore_merges)
 815                         return 0;
 816                 else if (opt->combine_merges)
 817                         return do_diff_combined(opt, commit);
 818                 else if (opt->first_parent_only) {
 819                         /*
 820                          * Generate merge log entry only for the first
 821                          * parent, showing summary diff of the others
 822                          * we merged _in_.
 823                          */
 824                         parse_commit_or_die(parents->item);
 825                         diff_tree_sha1(parents->item->tree->object.oid.hash,
 826                                        oid->hash, "", &opt->diffopt);
 827                         log_tree_diff_flush(opt);
 828                         return !opt->loginfo;
 829                 }
 830
 831                 /* If we show individual diffs, show the parent info */
 832                 log->parent = parents->item;
 833         }
 834
 835         showed_log = 0;
 836         for (;;) {
 837                 struct commit *parent = parents->item;
 838
 839                 parse_commit_or_die(parent);
 840                 diff_tree_sha1(parent->tree->object.oid.hash,
 841                                oid->hash, "", &opt->diffopt);
 842                 log_tree_diff_flush(opt);
 843
 844                 showed_log |= !opt->loginfo;
 845
 846                 /* Set up the log info for the next parent, if any.. */
 847                 parents = parents->next;
 848                 if (!parents)
 849                         break;
 850                 log->parent = parents->item;
 851                 opt->loginfo = log;
 852         }
 853         return showed_log;
 854 }
 855
 856 int log_tree_commit(struct rev_info *opt, struct commit *commit)
 857 {
 858         struct log_info log;
 859         int shown, close_file = opt->diffopt.close_file;
 860
 861         log.commit = commit;
 862         log.parent = NULL;
 863         opt->loginfo = &log;
 864         opt->diffopt.close_file = 0;
 865
 866         if (opt->line_level_traverse)
 867                 return line_log_print(opt, commit);
 868
 869         if (opt->track_linear && !opt->linear && !opt->reverse_output_stage)
 870                 fprintf(opt->diffopt.file, "\n%s\n", opt->break_bar);
 871         shown = log_tree_diff(opt, commit, &log);
 872         if (!shown && opt->loginfo && opt->always_show_header) {
 873                 log.parent = NULL;
 874                 show_log(opt);
 875                 shown = 1;
 876         }
 877         if (opt->track_linear && !opt->linear && opt->reverse_output_stage)
 878                 fprintf(opt->diffopt.file, "\n%s\n", opt->break_bar);
 879         opt->loginfo = NULL;
 880         maybe_flush_or_die(opt->diffopt.file, "stdout");
 881         if (close_file)
 882                 fclose(opt->diffopt.file);
 883         return shown;
 884 }