log-tree.c

   1 #include "cache.h"
   2 #include "config.h"
   3 #include "diff.h"
   4 #include "commit.h"
   5 #include "tag.h"
   6 #include "graph.h"
   7 #include "log-tree.h"
   8 #include "reflog-walk.h"
   9 #include "refs.h"
  10 #include "string-list.h"
  11 #include "color.h"
  12 #include "gpg-interface.h"
  13 #include "sequencer.h"
  14 #include "line-log.h"
  15
  16 static struct decoration name_decoration = { "object names" };
  17 static int decoration_loaded;
  18 static int decoration_flags;
  19
  20 static char decoration_colors[][COLOR_MAXLEN] = {
  21         GIT_COLOR_RESET,
  22         GIT_COLOR_BOLD_GREEN,   /* REF_LOCAL */
  23         GIT_COLOR_BOLD_RED,     /* REF_REMOTE */
  24         GIT_COLOR_BOLD_YELLOW,  /* REF_TAG */
  25         GIT_COLOR_BOLD_MAGENTA, /* REF_STASH */
  26         GIT_COLOR_BOLD_CYAN,    /* REF_HEAD */
  27         GIT_COLOR_BOLD_BLUE,    /* GRAFTED */
  28 };
  29
  30 static const char *decorate_get_color(int decorate_use_color, enum decoration_type ix)
  31 {
  32         if (want_color(decorate_use_color))
  33                 return decoration_colors[ix];
  34         return "";
  35 }
  36
  37 static int parse_decorate_color_slot(const char *slot)
  38 {
  39         /*
  40          * We're comparing with 'ignore-case' on
  41          * (because config.c sets them all tolower),
  42          * but let's match the letters in the literal
  43          * string values here with how they are
  44          * documented in Documentation/config.txt, for
  45          * consistency.
  46          *
  47          * We love being consistent, don't we?
  48          */
  49         if (!strcasecmp(slot, "branch"))
  50                 return DECORATION_REF_LOCAL;
  51         if (!strcasecmp(slot, "remoteBranch"))
  52                 return DECORATION_REF_REMOTE;
  53         if (!strcasecmp(slot, "tag"))
  54                 return DECORATION_REF_TAG;
  55         if (!strcasecmp(slot, "stash"))
  56                 return DECORATION_REF_STASH;
  57         if (!strcasecmp(slot, "HEAD"))
  58                 return DECORATION_REF_HEAD;
  59         return -1;
  60 }
  61
  62 int parse_decorate_color_config(const char *var, const char *slot_name, const char *value)
  63 {
  64         int slot = parse_decorate_color_slot(slot_name);
  65         if (slot < 0)
  66                 return 0;
  67         if (!value)
  68                 return config_error_nonbool(var);
  69         return color_parse(value, decoration_colors[slot]);
  70 }
  71
  72 /*
  73  * log-tree.c uses DIFF_OPT_TST for determining whether to use color
  74  * for showing the commit sha1, use the same check for --decorate
  75  */
  76 #define decorate_get_color_opt(o, ix) \
  77         decorate_get_color((o)->use_color, ix)
  78
  79 void add_name_decoration(enum decoration_type type, const char *name, struct object *obj)
  80 {
  81         struct name_decoration *res;
  82         FLEX_ALLOC_STR(res, name, name);
  83         res->type = type;
  84         res->next = add_decoration(&name_decoration, obj, res);
  85 }
  86
  87 const struct name_decoration *get_name_decoration(const struct object *obj)
  88 {
  89         return lookup_decoration(&name_decoration, obj);
  90 }
  91
  92 static int add_ref_decoration(const char *refname, const struct object_id *oid,
  93                               int flags, void *cb_data)
  94 {
  95         struct object *obj;
  96         enum decoration_type type = DECORATION_NONE;
  97         struct decoration_filter *filter = (struct decoration_filter *)cb_data;
  98
  99         if (filter && !ref_filter_match(refname,
 100                               filter->include_ref_pattern,
 101                               filter->exclude_ref_pattern))
 102                 return 0;
 103
 104         if (starts_with(refname, git_replace_ref_base)) {
 105                 struct object_id original_oid;
 106                 if (!check_replace_refs)
 107                         return 0;
 108                 if (get_oid_hex(refname + strlen(git_replace_ref_base),
 109                                 &original_oid)) {
 110                         warning("invalid replace ref %s", refname);
 111                         return 0;
 112                 }
 113                 obj = parse_object(&original_oid);
 114                 if (obj)
 115                         add_name_decoration(DECORATION_GRAFTED, "replaced", obj);
 116                 return 0;
 117         }
 118
 119         obj = parse_object(oid);
 120         if (!obj)
 121                 return 0;
 122
 123         if (starts_with(refname, "refs/heads/"))
 124                 type = DECORATION_REF_LOCAL;
 125         else if (starts_with(refname, "refs/remotes/"))
 126                 type = DECORATION_REF_REMOTE;
 127         else if (starts_with(refname, "refs/tags/"))
 128                 type = DECORATION_REF_TAG;
 129         else if (!strcmp(refname, "refs/stash"))
 130                 type = DECORATION_REF_STASH;
 131         else if (!strcmp(refname, "HEAD"))
 132                 type = DECORATION_REF_HEAD;
 133
 134         add_name_decoration(type, refname, obj);
 135         while (obj->type == OBJ_TAG) {
 136                 obj = ((struct tag *)obj)->tagged;
 137                 if (!obj)
 138                         break;
 139                 if (!obj->parsed)
 140                         parse_object(&obj->oid);
 141                 add_name_decoration(DECORATION_REF_TAG, refname, obj);
 142         }
 143         return 0;
 144 }
 145
 146 static int add_graft_decoration(const struct commit_graft *graft, void *cb_data)
 147 {
 148         struct commit *commit = lookup_commit(&graft->oid);
 149         if (!commit)
 150                 return 0;
 151         add_name_decoration(DECORATION_GRAFTED, "grafted", &commit->object);
 152         return 0;
 153 }
 154
 155 void load_ref_decorations(struct decoration_filter *filter, int flags)
 156 {
 157         if (!decoration_loaded) {
 158                 if (filter) {
 159                         struct string_list_item *item;
 160                         for_each_string_list_item(item, filter->exclude_ref_pattern) {
 161                                 normalize_glob_ref(item, NULL, item->string);
 162                         }
 163                         for_each_string_list_item(item, filter->include_ref_pattern) {
 164                                 normalize_glob_ref(item, NULL, item->string);
 165                         }
 166                 }
 167                 decoration_loaded = 1;
 168                 decoration_flags = flags;
 169                 for_each_ref(add_ref_decoration, filter);
 170                 head_ref(add_ref_decoration, filter);
 171                 for_each_commit_graft(add_graft_decoration, filter);
 172         }
 173 }
 174
 175 static void show_parents(struct commit *commit, int abbrev, FILE *file)
 176 {
 177         struct commit_list *p;
 178         for (p = commit->parents; p ; p = p->next) {
 179                 struct commit *parent = p->item;
 180                 fprintf(file, " %s", find_unique_abbrev(&parent->object.oid, abbrev));
 181         }
 182 }
 183
 184 static void show_children(struct rev_info *opt, struct commit *commit, int abbrev)
 185 {
 186         struct commit_list *p = lookup_decoration(&opt->children, &commit->object);
 187         for ( ; p; p = p->next) {
 188                 fprintf(opt->diffopt.file, " %s", find_unique_abbrev(&p->item->object.oid, abbrev));
 189         }
 190 }
 191
 192 /*
 193  * Do we have HEAD in the output, and also the branch it points at?
 194  * If so, find that decoration entry for that current branch.
 195  */
 196 static const struct name_decoration *current_pointed_by_HEAD(const struct name_decoration *decoration)
 197 {
 198         const struct name_decoration *list, *head = NULL;
 199         const char *branch_name = NULL;
 200         int rru_flags;
 201
 202         /* First find HEAD */
 203         for (list = decoration; list; list = list->next)
 204                 if (list->type == DECORATION_REF_HEAD) {
 205                         head = list;
 206                         break;
 207                 }
 208         if (!head)
 209                 return NULL;
 210
 211         /* Now resolve and find the matching current branch */
 212         branch_name = resolve_ref_unsafe("HEAD", 0, NULL, &rru_flags);
 213         if (!branch_name || !(rru_flags & REF_ISSYMREF))
 214                 return NULL;
 215
 216         if (!starts_with(branch_name, "refs/"))
 217                 return NULL;
 218
 219         /* OK, do we have that ref in the list? */
 220         for (list = decoration; list; list = list->next)
 221                 if ((list->type == DECORATION_REF_LOCAL) &&
 222                     !strcmp(branch_name, list->name)) {
 223                         return list;
 224                 }
 225
 226         return NULL;
 227 }
 228
 229 static void show_name(struct strbuf *sb, const struct name_decoration *decoration)
 230 {
 231         if (decoration_flags == DECORATE_SHORT_REFS)
 232                 strbuf_addstr(sb, prettify_refname(decoration->name));
 233         else
 234                 strbuf_addstr(sb, decoration->name);
 235 }
 236
 237 /*
 238  * The caller makes sure there is no funny color before calling.
 239  * format_decorations_extended makes sure the same after return.
 240  */
 241 void format_decorations_extended(struct strbuf *sb,
 242                         const struct commit *commit,
 243                         int use_color,
 244                         const char *prefix,
 245                         const char *separator,
 246                         const char *suffix)
 247 {
 248         const struct name_decoration *decoration;
 249         const struct name_decoration *current_and_HEAD;
 250         const char *color_commit =
 251                 diff_get_color(use_color, DIFF_COMMIT);
 252         const char *color_reset =
 253                 decorate_get_color(use_color, DECORATION_NONE);
 254
 255         decoration = get_name_decoration(&commit->object);
 256         if (!decoration)
 257                 return;
 258
 259         current_and_HEAD = current_pointed_by_HEAD(decoration);
 260         while (decoration) {
 261                 /*
 262                  * When both current and HEAD are there, only
 263                  * show HEAD->current where HEAD would have
 264                  * appeared, skipping the entry for current.
 265                  */
 266                 if (decoration != current_and_HEAD) {
 267                         strbuf_addstr(sb, color_commit);
 268                         strbuf_addstr(sb, prefix);
 269                         strbuf_addstr(sb, color_reset);
 270                         strbuf_addstr(sb, decorate_get_color(use_color, decoration->type));
 271                         if (decoration->type == DECORATION_REF_TAG)
 272                                 strbuf_addstr(sb, "tag: ");
 273
 274                         show_name(sb, decoration);
 275
 276                         if (current_and_HEAD &&
 277                             decoration->type == DECORATION_REF_HEAD) {
 278                                 strbuf_addstr(sb, " -> ");
 279                                 strbuf_addstr(sb, color_reset);
 280                                 strbuf_addstr(sb, decorate_get_color(use_color, current_and_HEAD->type));
 281                                 show_name(sb, current_and_HEAD);
 282                         }
 283                         strbuf_addstr(sb, color_reset);
 284
 285                         prefix = separator;
 286                 }
 287                 decoration = decoration->next;
 288         }
 289         strbuf_addstr(sb, color_commit);
 290         strbuf_addstr(sb, suffix);
 291         strbuf_addstr(sb, color_reset);
 292 }
 293
 294 void show_decorations(struct rev_info *opt, struct commit *commit)
 295 {
 296         struct strbuf sb = STRBUF_INIT;
 297
 298         if (opt->show_source && commit->util)
 299                 fprintf(opt->diffopt.file, "\t%s", (char *) commit->util);
 300         if (!opt->show_decorations)
 301                 return;
 302         format_decorations(&sb, commit, opt->diffopt.use_color);
 303         fputs(sb.buf, opt->diffopt.file);
 304         strbuf_release(&sb);
 305 }
 306
 307 static unsigned int digits_in_number(unsigned int number)
 308 {
 309         unsigned int i = 10, result = 1;
 310         while (i <= number) {
 311                 i *= 10;
 312                 result++;
 313         }
 314         return result;
 315 }
 316
 317 void fmt_output_subject(struct strbuf *filename,
 318                         const char *subject,
 319                         struct rev_info *info)
 320 {
 321         const char *suffix = info->patch_suffix;
 322         int nr = info->nr;
 323         int start_len = filename->len;
 324         int max_len = start_len + FORMAT_PATCH_NAME_MAX - (strlen(suffix) + 1);
 325
 326         if (0 < info->reroll_count)
 327                 strbuf_addf(filename, "v%d-", info->reroll_count);
 328         strbuf_addf(filename, "%04d-%s", nr, subject);
 329
 330         if (max_len < filename->len)
 331                 strbuf_setlen(filename, max_len);
 332         strbuf_addstr(filename, suffix);
 333 }
 334
 335 void fmt_output_commit(struct strbuf *filename,
 336                        struct commit *commit,
 337                        struct rev_info *info)
 338 {
 339         struct pretty_print_context ctx = {0};
 340         struct strbuf subject = STRBUF_INIT;
 341
 342         format_commit_message(commit, "%f", &subject, &ctx);
 343         fmt_output_subject(filename, subject.buf, info);
 344         strbuf_release(&subject);
 345 }
 346
 347 void fmt_output_email_subject(struct strbuf *sb, struct rev_info *opt)
 348 {
 349         if (opt->total > 0) {
 350                 strbuf_addf(sb, "Subject: [%s%s%0*d/%d] ",
 351                             opt->subject_prefix,
 352                             *opt->subject_prefix ? " " : "",
 353                             digits_in_number(opt->total),
 354                             opt->nr, opt->total);
 355         } else if (opt->total == 0 && opt->subject_prefix && *opt->subject_prefix) {
 356                 strbuf_addf(sb, "Subject: [%s] ",
 357                             opt->subject_prefix);
 358         } else {
 359                 strbuf_addstr(sb, "Subject: ");
 360         }
 361 }
 362
 363 void log_write_email_headers(struct rev_info *opt, struct commit *commit,
 364                              const char **extra_headers_p,
 365                              int *need_8bit_cte_p,
 366                              int maybe_multipart)
 367 {
 368         const char *extra_headers = opt->extra_headers;
 369         const char *name = oid_to_hex(opt->zero_commit ?
 370                                       &null_oid : &commit->object.oid);
 371
 372         *need_8bit_cte_p = 0; /* unknown */
 373
 374         fprintf(opt->diffopt.file, "From %s Mon Sep 17 00:00:00 2001\n", name);
 375         graph_show_oneline(opt->graph);
 376         if (opt->message_id) {
 377                 fprintf(opt->diffopt.file, "Message-Id: <%s>\n", opt->message_id);
 378                 graph_show_oneline(opt->graph);
 379         }
 380         if (opt->ref_message_ids && opt->ref_message_ids->nr > 0) {
 381                 int i, n;
 382                 n = opt->ref_message_ids->nr;
 383                 fprintf(opt->diffopt.file, "In-Reply-To: <%s>\n", opt->ref_message_ids->items[n-1].string);
 384                 for (i = 0; i < n; i++)
 385                         fprintf(opt->diffopt.file, "%s<%s>\n", (i > 0 ? "\t" : "References: "),
 386                                opt->ref_message_ids->items[i].string);
 387                 graph_show_oneline(opt->graph);
 388         }
 389         if (opt->mime_boundary && maybe_multipart) {
 390                 static char subject_buffer[1024];
 391                 static char buffer[1024];
 392                 struct strbuf filename =  STRBUF_INIT;
 393                 *need_8bit_cte_p = -1; /* NEVER */
 394                 snprintf(subject_buffer, sizeof(subject_buffer) - 1,
 395                          "%s"
 396                          "MIME-Version: 1.0\n"
 397                          "Content-Type: multipart/mixed;"
 398                          " boundary=\"%s%s\"\n"
 399                          "\n"
 400                          "This is a multi-part message in MIME "
 401                          "format.\n"
 402                          "--%s%s\n"
 403                          "Content-Type: text/plain; "
 404                          "charset=UTF-8; format=fixed\n"
 405                          "Content-Transfer-Encoding: 8bit\n\n",
 406                          extra_headers ? extra_headers : "",
 407                          mime_boundary_leader, opt->mime_boundary,
 408                          mime_boundary_leader, opt->mime_boundary);
 409                 extra_headers = subject_buffer;
 410
 411                 if (opt->numbered_files)
 412                         strbuf_addf(&filename, "%d", opt->nr);
 413                 else
 414                         fmt_output_commit(&filename, commit, opt);
 415                 snprintf(buffer, sizeof(buffer) - 1,
 416                          "\n--%s%s\n"
 417                          "Content-Type: text/x-patch;"
 418                          " name=\"%s\"\n"
 419                          "Content-Transfer-Encoding: 8bit\n"
 420                          "Content-Disposition: %s;"
 421                          " filename=\"%s\"\n\n",
 422                          mime_boundary_leader, opt->mime_boundary,
 423                          filename.buf,
 424                          opt->no_inline ? "attachment" : "inline",
 425                          filename.buf);
 426                 opt->diffopt.stat_sep = buffer;
 427                 strbuf_release(&filename);
 428         }
 429         *extra_headers_p = extra_headers;
 430 }
 431
 432 static void show_sig_lines(struct rev_info *opt, int status, const char *bol)
 433 {
 434         const char *color, *reset, *eol;
 435
 436         color = diff_get_color_opt(&opt->diffopt,
 437                                    status ? DIFF_WHITESPACE : DIFF_FRAGINFO);
 438         reset = diff_get_color_opt(&opt->diffopt, DIFF_RESET);
 439         while (*bol) {
 440                 eol = strchrnul(bol, '\n');
 441                 fprintf(opt->diffopt.file, "%s%.*s%s%s", color, (int)(eol - bol), bol, reset,
 442                        *eol ? "\n" : "");
 443                 graph_show_oneline(opt->graph);
 444                 bol = (*eol) ? (eol + 1) : eol;
 445         }
 446 }
 447
 448 static void show_signature(struct rev_info *opt, struct commit *commit)
 449 {
 450         struct strbuf payload = STRBUF_INIT;
 451         struct strbuf signature = STRBUF_INIT;
 452         struct strbuf gpg_output = STRBUF_INIT;
 453         int status;
 454
 455         if (parse_signed_commit(commit, &payload, &signature) <= 0)
 456                 goto out;
 457
 458         status = verify_signed_buffer(payload.buf, payload.len,
 459                                       signature.buf, signature.len,
 460                                       &gpg_output, NULL);
 461         if (status && !gpg_output.len)
 462                 strbuf_addstr(&gpg_output, "No signature\n");
 463
 464         show_sig_lines(opt, status, gpg_output.buf);
 465
 466  out:
 467         strbuf_release(&gpg_output);
 468         strbuf_release(&payload);
 469         strbuf_release(&signature);
 470 }
 471
 472 static int which_parent(const struct object_id *oid, const struct commit *commit)
 473 {
 474         int nth;
 475         const struct commit_list *parent;
 476
 477         for (nth = 0, parent = commit->parents; parent; parent = parent->next) {
 478                 if (!oidcmp(&parent->item->object.oid, oid))
 479                         return nth;
 480                 nth++;
 481         }
 482         return -1;
 483 }
 484
 485 static int is_common_merge(const struct commit *commit)
 486 {
 487         return (commit->parents
 488                 && commit->parents->next
 489                 && !commit->parents->next->next);
 490 }
 491
 492 static int show_one_mergetag(struct commit *commit,
 493                              struct commit_extra_header *extra,
 494                              void *data)
 495 {
 496         struct rev_info *opt = (struct rev_info *)data;
 497         struct object_id oid;
 498         struct tag *tag;
 499         struct strbuf verify_message;
 500         int status, nth;
 501         size_t payload_size, gpg_message_offset;
 502
 503         hash_object_file(extra->value, extra->len, type_name(OBJ_TAG), &oid);
 504         tag = lookup_tag(&oid);
 505         if (!tag)
 506                 return -1; /* error message already given */
 507
 508         strbuf_init(&verify_message, 256);
 509         if (parse_tag_buffer(tag, extra->value, extra->len))
 510                 strbuf_addstr(&verify_message, "malformed mergetag\n");
 511         else if (is_common_merge(commit) &&
 512                  !oidcmp(&tag->tagged->oid,
 513                           &commit->parents->next->item->object.oid))
 514                 strbuf_addf(&verify_message,
 515                             "merged tag '%s'\n", tag->tag);
 516         else if ((nth = which_parent(&tag->tagged->oid, commit)) < 0)
 517                 strbuf_addf(&verify_message, "tag %s names a non-parent %s\n",
 518                                     tag->tag, tag->tagged->oid.hash);
 519         else
 520                 strbuf_addf(&verify_message,
 521                             "parent #%d, tagged '%s'\n", nth + 1, tag->tag);
 522         gpg_message_offset = verify_message.len;
 523
 524         payload_size = parse_signature(extra->value, extra->len);
 525         status = -1;
 526         if (extra->len > payload_size) {
 527                 /* could have a good signature */
 528                 if (!verify_signed_buffer(extra->value, payload_size,
 529                                           extra->value + payload_size,
 530                                           extra->len - payload_size,
 531                                           &verify_message, NULL))
 532                         status = 0; /* good */
 533                 else if (verify_message.len <= gpg_message_offset)
 534                         strbuf_addstr(&verify_message, "No signature\n");
 535                 /* otherwise we couldn't verify, which is shown as bad */
 536         }
 537
 538         show_sig_lines(opt, status, verify_message.buf);
 539         strbuf_release(&verify_message);
 540         return 0;
 541 }
 542
 543 static int show_mergetag(struct rev_info *opt, struct commit *commit)
 544 {
 545         return for_each_mergetag(show_one_mergetag, commit, opt);
 546 }
 547
 548 void show_log(struct rev_info *opt)
 549 {
 550         struct strbuf msgbuf = STRBUF_INIT;
 551         struct log_info *log = opt->loginfo;
 552         struct commit *commit = log->commit, *parent = log->parent;
 553         int abbrev_commit = opt->abbrev_commit ? opt->abbrev : GIT_SHA1_HEXSZ;
 554         const char *extra_headers = opt->extra_headers;
 555         struct pretty_print_context ctx = {0};
 556
 557         opt->loginfo = NULL;
 558         if (!opt->verbose_header) {
 559                 graph_show_commit(opt->graph);
 560
 561                 if (!opt->graph)
 562                         put_revision_mark(opt, commit);
 563                 fputs(find_unique_abbrev(&commit->object.oid, abbrev_commit), opt->diffopt.file);
 564                 if (opt->print_parents)
 565                         show_parents(commit, abbrev_commit, opt->diffopt.file);
 566                 if (opt->children.name)
 567                         show_children(opt, commit, abbrev_commit);
 568                 show_decorations(opt, commit);
 569                 if (opt->graph && !graph_is_commit_finished(opt->graph)) {
 570                         putc('\n', opt->diffopt.file);
 571                         graph_show_remainder(opt->graph);
 572                 }
 573                 putc(opt->diffopt.line_termination, opt->diffopt.file);
 574                 return;
 575         }
 576
 577         /*
 578          * If use_terminator is set, we already handled any record termination
 579          * at the end of the last record.
 580          * Otherwise, add a diffopt.line_termination character before all
 581          * entries but the first.  (IOW, as a separator between entries)
 582          */
 583         if (opt->shown_one && !opt->use_terminator) {
 584                 /*
 585                  * If entries are separated by a newline, the output
 586                  * should look human-readable.  If the last entry ended
 587                  * with a newline, print the graph output before this
 588                  * newline.  Otherwise it will end up as a completely blank
 589                  * line and will look like a gap in the graph.
 590                  *
 591                  * If the entry separator is not a newline, the output is
 592                  * primarily intended for programmatic consumption, and we
 593                  * never want the extra graph output before the entry
 594                  * separator.
 595                  */
 596                 if (opt->diffopt.line_termination == '\n' &&
 597                     !opt->missing_newline)
 598                         graph_show_padding(opt->graph);
 599                 putc(opt->diffopt.line_termination, opt->diffopt.file);
 600         }
 601         opt->shown_one = 1;
 602
 603         /*
 604          * If the history graph was requested,
 605          * print the graph, up to this commit's line
 606          */
 607         graph_show_commit(opt->graph);
 608
 609         /*
 610          * Print header line of header..
 611          */
 612
 613         if (cmit_fmt_is_mail(opt->commit_format)) {
 614                 log_write_email_headers(opt, commit, &extra_headers,
 615                                         &ctx.need_8bit_cte, 1);
 616                 ctx.rev = opt;
 617                 ctx.print_email_subject = 1;
 618         } else if (opt->commit_format != CMIT_FMT_USERFORMAT) {
 619                 fputs(diff_get_color_opt(&opt->diffopt, DIFF_COMMIT), opt->diffopt.file);
 620                 if (opt->commit_format != CMIT_FMT_ONELINE)
 621                         fputs("commit ", opt->diffopt.file);
 622
 623                 if (!opt->graph)
 624                         put_revision_mark(opt, commit);
 625                 fputs(find_unique_abbrev(&commit->object.oid,
 626                                          abbrev_commit),
 627                       opt->diffopt.file);
 628                 if (opt->print_parents)
 629                         show_parents(commit, abbrev_commit, opt->diffopt.file);
 630                 if (opt->children.name)
 631                         show_children(opt, commit, abbrev_commit);
 632                 if (parent)
 633                         fprintf(opt->diffopt.file, " (from %s)",
 634                                find_unique_abbrev(&parent->object.oid, abbrev_commit));
 635                 fputs(diff_get_color_opt(&opt->diffopt, DIFF_RESET), opt->diffopt.file);
 636                 show_decorations(opt, commit);
 637                 if (opt->commit_format == CMIT_FMT_ONELINE) {
 638                         putc(' ', opt->diffopt.file);
 639                 } else {
 640                         putc('\n', opt->diffopt.file);
 641                         graph_show_oneline(opt->graph);
 642                 }
 643                 if (opt->reflog_info) {
 644                         /*
 645                          * setup_revisions() ensures that opt->reflog_info
 646                          * and opt->graph cannot both be set,
 647                          * so we don't need to worry about printing the
 648                          * graph info here.
 649                          */
 650                         show_reflog_message(opt->reflog_info,
 651                                             opt->commit_format == CMIT_FMT_ONELINE,
 652                                             &opt->date_mode,
 653                                             opt->date_mode_explicit);
 654                         if (opt->commit_format == CMIT_FMT_ONELINE)
 655                                 return;
 656                 }
 657         }
 658
 659         if (opt->show_signature) {
 660                 show_signature(opt, commit);
 661                 show_mergetag(opt, commit);
 662         }
 663
 664         if (opt->show_notes) {
 665                 int raw;
 666                 struct strbuf notebuf = STRBUF_INIT;
 667
 668                 raw = (opt->commit_format == CMIT_FMT_USERFORMAT);
 669                 format_display_notes(&commit->object.oid, &notebuf,
 670                                      get_log_output_encoding(), raw);
 671                 ctx.notes_message = notebuf.len
 672                         ? strbuf_detach(&notebuf, NULL)
 673                         : xcalloc(1, 1);
 674         }
 675
 676         /*
 677          * And then the pretty-printed message itself
 678          */
 679         if (ctx.need_8bit_cte >= 0 && opt->add_signoff)
 680                 ctx.need_8bit_cte =
 681                         has_non_ascii(fmt_name(getenv("GIT_COMMITTER_NAME"),
 682                                                getenv("GIT_COMMITTER_EMAIL")));
 683         ctx.date_mode = opt->date_mode;
 684         ctx.date_mode_explicit = opt->date_mode_explicit;
 685         ctx.abbrev = opt->diffopt.abbrev;
 686         ctx.after_subject = extra_headers;
 687         ctx.preserve_subject = opt->preserve_subject;
 688         ctx.reflog_info = opt->reflog_info;
 689         ctx.fmt = opt->commit_format;
 690         ctx.mailmap = opt->mailmap;
 691         ctx.color = opt->diffopt.use_color;
 692         ctx.expand_tabs_in_log = opt->expand_tabs_in_log;
 693         ctx.output_encoding = get_log_output_encoding();
 694         if (opt->from_ident.mail_begin && opt->from_ident.name_begin)
 695                 ctx.from_ident = &opt->from_ident;
 696         if (opt->graph)
 697                 ctx.graph_width = graph_width(opt->graph);
 698         pretty_print_commit(&ctx, commit, &msgbuf);
 699
 700         if (opt->add_signoff)
 701                 append_signoff(&msgbuf, 0, APPEND_SIGNOFF_DEDUP);
 702
 703         if ((ctx.fmt != CMIT_FMT_USERFORMAT) &&
 704             ctx.notes_message && *ctx.notes_message) {
 705                 if (cmit_fmt_is_mail(ctx.fmt)) {
 706                         strbuf_addstr(&msgbuf, "---\n");
 707                         opt->shown_dashes = 1;
 708                 }
 709                 strbuf_addstr(&msgbuf, ctx.notes_message);
 710         }
 711
 712         if (opt->show_log_size) {
 713                 fprintf(opt->diffopt.file, "log size %i\n", (int)msgbuf.len);
 714                 graph_show_oneline(opt->graph);
 715         }
 716
 717         /*
 718          * Set opt->missing_newline if msgbuf doesn't
 719          * end in a newline (including if it is empty)
 720          */
 721         if (!msgbuf.len || msgbuf.buf[msgbuf.len - 1] != '\n')
 722                 opt->missing_newline = 1;
 723         else
 724                 opt->missing_newline = 0;
 725
 726         graph_show_commit_msg(opt->graph, opt->diffopt.file, &msgbuf);
 727         if (opt->use_terminator && !commit_format_is_empty(opt->commit_format)) {
 728                 if (!opt->missing_newline)
 729                         graph_show_padding(opt->graph);
 730                 putc(opt->diffopt.line_termination, opt->diffopt.file);
 731         }
 732
 733         strbuf_release(&msgbuf);
 734         free(ctx.notes_message);
 735 }
 736
 737 int log_tree_diff_flush(struct rev_info *opt)
 738 {
 739         opt->shown_dashes = 0;
 740         diffcore_std(&opt->diffopt);
 741
 742         if (diff_queue_is_empty()) {
 743                 int saved_fmt = opt->diffopt.output_format;
 744                 opt->diffopt.output_format = DIFF_FORMAT_NO_OUTPUT;
 745                 diff_flush(&opt->diffopt);
 746                 opt->diffopt.output_format = saved_fmt;
 747                 return 0;
 748         }
 749
 750         if (opt->loginfo && !opt->no_commit_id) {
 751                 show_log(opt);
 752                 if ((opt->diffopt.output_format & ~DIFF_FORMAT_NO_OUTPUT) &&
 753                     opt->verbose_header &&
 754                     opt->commit_format != CMIT_FMT_ONELINE &&
 755                     !commit_format_is_empty(opt->commit_format)) {
 756                         /*
 757                          * When showing a verbose header (i.e. log message),
 758                          * and not in --pretty=oneline format, we would want
 759                          * an extra newline between the end of log and the
 760                          * diff/diffstat output for readability.
 761                          */
 762                         int pch = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_PATCH;
 763                         if (opt->diffopt.output_prefix) {
 764                                 struct strbuf *msg = NULL;
 765                                 msg = opt->diffopt.output_prefix(&opt->diffopt,
 766                                         opt->diffopt.output_prefix_data);
 767                                 fwrite(msg->buf, msg->len, 1, opt->diffopt.file);
 768                         }
 769
 770                         /*
 771                          * We may have shown three-dashes line early
 772                          * between notes and the log message, in which
 773                          * case we only want a blank line after the
 774                          * notes without (an extra) three-dashes line.
 775                          * Otherwise, we show the three-dashes line if
 776                          * we are showing the patch with diffstat, but
 777                          * in that case, there is no extra blank line
 778                          * after the three-dashes line.
 779                          */
 780                         if (!opt->shown_dashes &&
 781                             (pch & opt->diffopt.output_format) == pch)
 782                                 fprintf(opt->diffopt.file, "---");
 783                         putc('\n', opt->diffopt.file);
 784                 }
 785         }
 786         diff_flush(&opt->diffopt);
 787         return 1;
 788 }
 789
 790 static int do_diff_combined(struct rev_info *opt, struct commit *commit)
 791 {
 792         diff_tree_combined_merge(commit, opt->dense_combined_merges, opt);
 793         return !opt->loginfo;
 794 }
 795
 796 /*
 797  * Show the diff of a commit.
 798  *
 799  * Return true if we printed any log info messages
 800  */
 801 static int log_tree_diff(struct rev_info *opt, struct commit *commit, struct log_info *log)
 802 {
 803         int showed_log;
 804         struct commit_list *parents;
 805         struct object_id *oid;
 806
 807         if (!opt->diff && !opt->diffopt.flags.exit_with_status)
 808                 return 0;
 809
 810         parse_commit_or_die(commit);
 811         oid = get_commit_tree_oid(commit);
 812
 813         /* Root commit? */
 814         parents = get_saved_parents(opt, commit);
 815         if (!parents) {
 816                 if (opt->show_root_diff) {
 817                         diff_root_tree_oid(oid, "", &opt->diffopt);
 818                         log_tree_diff_flush(opt);
 819                 }
 820                 return !opt->loginfo;
 821         }
 822
 823         /* More than one parent? */
 824         if (parents && parents->next) {
 825                 if (opt->ignore_merges)
 826                         return 0;
 827                 else if (opt->combine_merges)
 828                         return do_diff_combined(opt, commit);
 829                 else if (opt->first_parent_only) {
 830                         /*
 831                          * Generate merge log entry only for the first
 832                          * parent, showing summary diff of the others
 833                          * we merged _in_.
 834                          */
 835                         parse_commit_or_die(parents->item);
 836                         diff_tree_oid(get_commit_tree_oid(parents->item),
 837                                       oid, "", &opt->diffopt);
 838                         log_tree_diff_flush(opt);
 839                         return !opt->loginfo;
 840                 }
 841
 842                 /* If we show individual diffs, show the parent info */
 843                 log->parent = parents->item;
 844         }
 845
 846         showed_log = 0;
 847         for (;;) {
 848                 struct commit *parent = parents->item;
 849
 850                 parse_commit_or_die(parent);
 851                 diff_tree_oid(get_commit_tree_oid(parent),
 852                               oid, "", &opt->diffopt);
 853                 log_tree_diff_flush(opt);
 854
 855                 showed_log |= !opt->loginfo;
 856
 857                 /* Set up the log info for the next parent, if any.. */
 858                 parents = parents->next;
 859                 if (!parents)
 860                         break;
 861                 log->parent = parents->item;
 862                 opt->loginfo = log;
 863         }
 864         return showed_log;
 865 }
 866
 867 int log_tree_commit(struct rev_info *opt, struct commit *commit)
 868 {
 869         struct log_info log;
 870         int shown, close_file = opt->diffopt.close_file;
 871
 872         log.commit = commit;
 873         log.parent = NULL;
 874         opt->loginfo = &log;
 875         opt->diffopt.close_file = 0;
 876
 877         if (opt->line_level_traverse)
 878                 return line_log_print(opt, commit);
 879
 880         if (opt->track_linear && !opt->linear && !opt->reverse_output_stage)
 881                 fprintf(opt->diffopt.file, "\n%s\n", opt->break_bar);
 882         shown = log_tree_diff(opt, commit, &log);
 883         if (!shown && opt->loginfo && opt->always_show_header) {
 884                 log.parent = NULL;
 885                 show_log(opt);
 886                 shown = 1;
 887         }
 888         if (opt->track_linear && !opt->linear && opt->reverse_output_stage)
 889                 fprintf(opt->diffopt.file, "\n%s\n", opt->break_bar);
 890         opt->loginfo = NULL;
 891         maybe_flush_or_die(opt->diffopt.file, "stdout");
 892         if (close_file)
 893                 fclose(opt->diffopt.file);
 894         return shown;
 895 }