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 #include "help.h"
  16
  17 static struct decoration name_decoration = { "object names" };
  18 static int decoration_loaded;
  19 static int decoration_flags;
  20
  21 static char decoration_colors[][COLOR_MAXLEN] = {
  22         GIT_COLOR_RESET,
  23         GIT_COLOR_BOLD_GREEN,   /* REF_LOCAL */
  24         GIT_COLOR_BOLD_RED,     /* REF_REMOTE */
  25         GIT_COLOR_BOLD_YELLOW,  /* REF_TAG */
  26         GIT_COLOR_BOLD_MAGENTA, /* REF_STASH */
  27         GIT_COLOR_BOLD_CYAN,    /* REF_HEAD */
  28         GIT_COLOR_BOLD_BLUE,    /* GRAFTED */
  29 };
  30
  31 static const char *color_decorate_slots[] = {
  32         [DECORATION_REF_LOCAL]  = "branch",
  33         [DECORATION_REF_REMOTE] = "remoteBranch",
  34         [DECORATION_REF_TAG]    = "tag",
  35         [DECORATION_REF_STASH]  = "stash",
  36         [DECORATION_REF_HEAD]   = "HEAD",
  37         [DECORATION_GRAFTED]    = "grafted",
  38 };
  39
  40 static const char *decorate_get_color(int decorate_use_color, enum decoration_type ix)
  41 {
  42         if (want_color(decorate_use_color))
  43                 return decoration_colors[ix];
  44         return "";
  45 }
  46
  47 define_list_config_array(color_decorate_slots);
  48
  49 int parse_decorate_color_config(const char *var, const char *slot_name, const char *value)
  50 {
  51         int slot = LOOKUP_CONFIG(color_decorate_slots, slot_name);
  52         if (slot < 0)
  53                 return 0;
  54         if (!value)
  55                 return config_error_nonbool(var);
  56         return color_parse(value, decoration_colors[slot]);
  57 }
  58
  59 /*
  60  * log-tree.c uses DIFF_OPT_TST for determining whether to use color
  61  * for showing the commit sha1, use the same check for --decorate
  62  */
  63 #define decorate_get_color_opt(o, ix) \
  64         decorate_get_color((o)->use_color, ix)
  65
  66 void add_name_decoration(enum decoration_type type, const char *name, struct object *obj)
  67 {
  68         struct name_decoration *res;
  69         FLEX_ALLOC_STR(res, name, name);
  70         res->type = type;
  71         res->next = add_decoration(&name_decoration, obj, res);
  72 }
  73
  74 const struct name_decoration *get_name_decoration(const struct object *obj)
  75 {
  76         return lookup_decoration(&name_decoration, obj);
  77 }
  78
  79 static int add_ref_decoration(const char *refname, const struct object_id *oid,
  80                               int flags, void *cb_data)
  81 {
  82         struct object *obj;
  83         enum decoration_type type = DECORATION_NONE;
  84         struct decoration_filter *filter = (struct decoration_filter *)cb_data;
  85
  86         if (filter && !ref_filter_match(refname,
  87                               filter->include_ref_pattern,
  88                               filter->exclude_ref_pattern))
  89                 return 0;
  90
  91         if (starts_with(refname, git_replace_ref_base)) {
  92                 struct object_id original_oid;
  93                 if (!check_replace_refs)
  94                         return 0;
  95                 if (get_oid_hex(refname + strlen(git_replace_ref_base),
  96                                 &original_oid)) {
  97                         warning("invalid replace ref %s", refname);
  98                         return 0;
  99                 }
 100                 obj = parse_object(&original_oid);
 101                 if (obj)
 102                         add_name_decoration(DECORATION_GRAFTED, "replaced", obj);
 103                 return 0;
 104         }
 105
 106         obj = parse_object(oid);
 107         if (!obj)
 108                 return 0;
 109
 110         if (starts_with(refname, "refs/heads/"))
 111                 type = DECORATION_REF_LOCAL;
 112         else if (starts_with(refname, "refs/remotes/"))
 113                 type = DECORATION_REF_REMOTE;
 114         else if (starts_with(refname, "refs/tags/"))
 115                 type = DECORATION_REF_TAG;
 116         else if (!strcmp(refname, "refs/stash"))
 117                 type = DECORATION_REF_STASH;
 118         else if (!strcmp(refname, "HEAD"))
 119                 type = DECORATION_REF_HEAD;
 120
 121         add_name_decoration(type, refname, obj);
 122         while (obj->type == OBJ_TAG) {
 123                 obj = ((struct tag *)obj)->tagged;
 124                 if (!obj)
 125                         break;
 126                 if (!obj->parsed)
 127                         parse_object(&obj->oid);
 128                 add_name_decoration(DECORATION_REF_TAG, refname, obj);
 129         }
 130         return 0;
 131 }
 132
 133 static int add_graft_decoration(const struct commit_graft *graft, void *cb_data)
 134 {
 135         struct commit *commit = lookup_commit(&graft->oid);
 136         if (!commit)
 137                 return 0;
 138         add_name_decoration(DECORATION_GRAFTED, "grafted", &commit->object);
 139         return 0;
 140 }
 141
 142 void load_ref_decorations(struct decoration_filter *filter, int flags)
 143 {
 144         if (!decoration_loaded) {
 145                 if (filter) {
 146                         struct string_list_item *item;
 147                         for_each_string_list_item(item, filter->exclude_ref_pattern) {
 148                                 normalize_glob_ref(item, NULL, item->string);
 149                         }
 150                         for_each_string_list_item(item, filter->include_ref_pattern) {
 151                                 normalize_glob_ref(item, NULL, item->string);
 152                         }
 153                 }
 154                 decoration_loaded = 1;
 155                 decoration_flags = flags;
 156                 for_each_ref(add_ref_decoration, filter);
 157                 head_ref(add_ref_decoration, filter);
 158                 for_each_commit_graft(add_graft_decoration, filter);
 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, 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, 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         int rru_flags;
 188
 189         /* First find HEAD */
 190         for (list = decoration; list; list = list->next)
 191                 if (list->type == DECORATION_REF_HEAD) {
 192                         head = list;
 193                         break;
 194                 }
 195         if (!head)
 196                 return NULL;
 197
 198         /* Now resolve and find the matching current branch */
 199         branch_name = resolve_ref_unsafe("HEAD", 0, NULL, &rru_flags);
 200         if (!branch_name || !(rru_flags & REF_ISSYMREF))
 201                 return NULL;
 202
 203         if (!starts_with(branch_name, "refs/"))
 204                 return NULL;
 205
 206         /* OK, do we have that ref in the list? */
 207         for (list = decoration; list; list = list->next)
 208                 if ((list->type == DECORATION_REF_LOCAL) &&
 209                     !strcmp(branch_name, list->name)) {
 210                         return list;
 211                 }
 212
 213         return NULL;
 214 }
 215
 216 static void show_name(struct strbuf *sb, const struct name_decoration *decoration)
 217 {
 218         if (decoration_flags == DECORATE_SHORT_REFS)
 219                 strbuf_addstr(sb, prettify_refname(decoration->name));
 220         else
 221                 strbuf_addstr(sb, decoration->name);
 222 }
 223
 224 /*
 225  * The caller makes sure there is no funny color before calling.
 226  * format_decorations_extended makes sure the same after return.
 227  */
 228 void format_decorations_extended(struct strbuf *sb,
 229                         const struct commit *commit,
 230                         int use_color,
 231                         const char *prefix,
 232                         const char *separator,
 233                         const char *suffix)
 234 {
 235         const struct name_decoration *decoration;
 236         const struct name_decoration *current_and_HEAD;
 237         const char *color_commit =
 238                 diff_get_color(use_color, DIFF_COMMIT);
 239         const char *color_reset =
 240                 decorate_get_color(use_color, DECORATION_NONE);
 241
 242         decoration = get_name_decoration(&commit->object);
 243         if (!decoration)
 244                 return;
 245
 246         current_and_HEAD = current_pointed_by_HEAD(decoration);
 247         while (decoration) {
 248                 /*
 249                  * When both current and HEAD are there, only
 250                  * show HEAD->current where HEAD would have
 251                  * appeared, skipping the entry for current.
 252                  */
 253                 if (decoration != current_and_HEAD) {
 254                         strbuf_addstr(sb, color_commit);
 255                         strbuf_addstr(sb, prefix);
 256                         strbuf_addstr(sb, color_reset);
 257                         strbuf_addstr(sb, decorate_get_color(use_color, decoration->type));
 258                         if (decoration->type == DECORATION_REF_TAG)
 259                                 strbuf_addstr(sb, "tag: ");
 260
 261                         show_name(sb, decoration);
 262
 263                         if (current_and_HEAD &&
 264                             decoration->type == DECORATION_REF_HEAD) {
 265                                 strbuf_addstr(sb, " -> ");
 266                                 strbuf_addstr(sb, color_reset);
 267                                 strbuf_addstr(sb, decorate_get_color(use_color, current_and_HEAD->type));
 268                                 show_name(sb, current_and_HEAD);
 269                         }
 270                         strbuf_addstr(sb, color_reset);
 271
 272                         prefix = separator;
 273                 }
 274                 decoration = decoration->next;
 275         }
 276         strbuf_addstr(sb, color_commit);
 277         strbuf_addstr(sb, suffix);
 278         strbuf_addstr(sb, color_reset);
 279 }
 280
 281 void show_decorations(struct rev_info *opt, struct commit *commit)
 282 {
 283         struct strbuf sb = STRBUF_INIT;
 284
 285         if (opt->show_source && commit->util)
 286                 fprintf(opt->diffopt.file, "\t%s", (char *) commit->util);
 287         if (!opt->show_decorations)
 288                 return;
 289         format_decorations(&sb, commit, opt->diffopt.use_color);
 290         fputs(sb.buf, opt->diffopt.file);
 291         strbuf_release(&sb);
 292 }
 293
 294 static unsigned int digits_in_number(unsigned int number)
 295 {
 296         unsigned int i = 10, result = 1;
 297         while (i <= number) {
 298                 i *= 10;
 299                 result++;
 300         }
 301         return result;
 302 }
 303
 304 void fmt_output_subject(struct strbuf *filename,
 305                         const char *subject,
 306                         struct rev_info *info)
 307 {
 308         const char *suffix = info->patch_suffix;
 309         int nr = info->nr;
 310         int start_len = filename->len;
 311         int max_len = start_len + FORMAT_PATCH_NAME_MAX - (strlen(suffix) + 1);
 312
 313         if (0 < info->reroll_count)
 314                 strbuf_addf(filename, "v%d-", info->reroll_count);
 315         strbuf_addf(filename, "%04d-%s", nr, subject);
 316
 317         if (max_len < filename->len)
 318                 strbuf_setlen(filename, max_len);
 319         strbuf_addstr(filename, suffix);
 320 }
 321
 322 void fmt_output_commit(struct strbuf *filename,
 323                        struct commit *commit,
 324                        struct rev_info *info)
 325 {
 326         struct pretty_print_context ctx = {0};
 327         struct strbuf subject = STRBUF_INIT;
 328
 329         format_commit_message(commit, "%f", &subject, &ctx);
 330         fmt_output_subject(filename, subject.buf, info);
 331         strbuf_release(&subject);
 332 }
 333
 334 void fmt_output_email_subject(struct strbuf *sb, struct rev_info *opt)
 335 {
 336         if (opt->total > 0) {
 337                 strbuf_addf(sb, "Subject: [%s%s%0*d/%d] ",
 338                             opt->subject_prefix,
 339                             *opt->subject_prefix ? " " : "",
 340                             digits_in_number(opt->total),
 341                             opt->nr, opt->total);
 342         } else if (opt->total == 0 && opt->subject_prefix && *opt->subject_prefix) {
 343                 strbuf_addf(sb, "Subject: [%s] ",
 344                             opt->subject_prefix);
 345         } else {
 346                 strbuf_addstr(sb, "Subject: ");
 347         }
 348 }
 349
 350 void log_write_email_headers(struct rev_info *opt, struct commit *commit,
 351                              const char **extra_headers_p,
 352                              int *need_8bit_cte_p,
 353                              int maybe_multipart)
 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 && maybe_multipart) {
 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 int 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_object_file(extra->value, extra->len, type_name(OBJ_TAG), &oid);
 491         tag = lookup_tag(&oid);
 492         if (!tag)
 493                 return -1; /* 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         return 0;
 528 }
 529
 530 static int show_mergetag(struct rev_info *opt, struct commit *commit)
 531 {
 532         return for_each_mergetag(show_one_mergetag, commit, opt);
 533 }
 534
 535 void show_log(struct rev_info *opt)
 536 {
 537         struct strbuf msgbuf = STRBUF_INIT;
 538         struct log_info *log = opt->loginfo;
 539         struct commit *commit = log->commit, *parent = log->parent;
 540         int abbrev_commit = opt->abbrev_commit ? opt->abbrev : GIT_SHA1_HEXSZ;
 541         const char *extra_headers = opt->extra_headers;
 542         struct pretty_print_context ctx = {0};
 543
 544         opt->loginfo = NULL;
 545         if (!opt->verbose_header) {
 546                 graph_show_commit(opt->graph);
 547
 548                 if (!opt->graph)
 549                         put_revision_mark(opt, commit);
 550                 fputs(find_unique_abbrev(&commit->object.oid, abbrev_commit), opt->diffopt.file);
 551                 if (opt->print_parents)
 552                         show_parents(commit, abbrev_commit, opt->diffopt.file);
 553                 if (opt->children.name)
 554                         show_children(opt, commit, abbrev_commit);
 555                 show_decorations(opt, commit);
 556                 if (opt->graph && !graph_is_commit_finished(opt->graph)) {
 557                         putc('\n', opt->diffopt.file);
 558                         graph_show_remainder(opt->graph);
 559                 }
 560                 putc(opt->diffopt.line_termination, opt->diffopt.file);
 561                 return;
 562         }
 563
 564         /*
 565          * If use_terminator is set, we already handled any record termination
 566          * at the end of the last record.
 567          * Otherwise, add a diffopt.line_termination character before all
 568          * entries but the first.  (IOW, as a separator between entries)
 569          */
 570         if (opt->shown_one && !opt->use_terminator) {
 571                 /*
 572                  * If entries are separated by a newline, the output
 573                  * should look human-readable.  If the last entry ended
 574                  * with a newline, print the graph output before this
 575                  * newline.  Otherwise it will end up as a completely blank
 576                  * line and will look like a gap in the graph.
 577                  *
 578                  * If the entry separator is not a newline, the output is
 579                  * primarily intended for programmatic consumption, and we
 580                  * never want the extra graph output before the entry
 581                  * separator.
 582                  */
 583                 if (opt->diffopt.line_termination == '\n' &&
 584                     !opt->missing_newline)
 585                         graph_show_padding(opt->graph);
 586                 putc(opt->diffopt.line_termination, opt->diffopt.file);
 587         }
 588         opt->shown_one = 1;
 589
 590         /*
 591          * If the history graph was requested,
 592          * print the graph, up to this commit's line
 593          */
 594         graph_show_commit(opt->graph);
 595
 596         /*
 597          * Print header line of header..
 598          */
 599
 600         if (cmit_fmt_is_mail(opt->commit_format)) {
 601                 log_write_email_headers(opt, commit, &extra_headers,
 602                                         &ctx.need_8bit_cte, 1);
 603                 ctx.rev = opt;
 604                 ctx.print_email_subject = 1;
 605         } else if (opt->commit_format != CMIT_FMT_USERFORMAT) {
 606                 fputs(diff_get_color_opt(&opt->diffopt, DIFF_COMMIT), opt->diffopt.file);
 607                 if (opt->commit_format != CMIT_FMT_ONELINE)
 608                         fputs("commit ", opt->diffopt.file);
 609
 610                 if (!opt->graph)
 611                         put_revision_mark(opt, commit);
 612                 fputs(find_unique_abbrev(&commit->object.oid,
 613                                          abbrev_commit),
 614                       opt->diffopt.file);
 615                 if (opt->print_parents)
 616                         show_parents(commit, abbrev_commit, opt->diffopt.file);
 617                 if (opt->children.name)
 618                         show_children(opt, commit, abbrev_commit);
 619                 if (parent)
 620                         fprintf(opt->diffopt.file, " (from %s)",
 621                                find_unique_abbrev(&parent->object.oid, abbrev_commit));
 622                 fputs(diff_get_color_opt(&opt->diffopt, DIFF_RESET), opt->diffopt.file);
 623                 show_decorations(opt, commit);
 624                 if (opt->commit_format == CMIT_FMT_ONELINE) {
 625                         putc(' ', opt->diffopt.file);
 626                 } else {
 627                         putc('\n', opt->diffopt.file);
 628                         graph_show_oneline(opt->graph);
 629                 }
 630                 if (opt->reflog_info) {
 631                         /*
 632                          * setup_revisions() ensures that opt->reflog_info
 633                          * and opt->graph cannot both be set,
 634                          * so we don't need to worry about printing the
 635                          * graph info here.
 636                          */
 637                         show_reflog_message(opt->reflog_info,
 638                                             opt->commit_format == CMIT_FMT_ONELINE,
 639                                             &opt->date_mode,
 640                                             opt->date_mode_explicit);
 641                         if (opt->commit_format == CMIT_FMT_ONELINE)
 642                                 return;
 643                 }
 644         }
 645
 646         if (opt->show_signature) {
 647                 show_signature(opt, commit);
 648                 show_mergetag(opt, commit);
 649         }
 650
 651         if (opt->show_notes) {
 652                 int raw;
 653                 struct strbuf notebuf = STRBUF_INIT;
 654
 655                 raw = (opt->commit_format == CMIT_FMT_USERFORMAT);
 656                 format_display_notes(&commit->object.oid, &notebuf,
 657                                      get_log_output_encoding(), raw);
 658                 ctx.notes_message = notebuf.len
 659                         ? strbuf_detach(&notebuf, NULL)
 660                         : xcalloc(1, 1);
 661         }
 662
 663         /*
 664          * And then the pretty-printed message itself
 665          */
 666         if (ctx.need_8bit_cte >= 0 && opt->add_signoff)
 667                 ctx.need_8bit_cte =
 668                         has_non_ascii(fmt_name(getenv("GIT_COMMITTER_NAME"),
 669                                                getenv("GIT_COMMITTER_EMAIL")));
 670         ctx.date_mode = opt->date_mode;
 671         ctx.date_mode_explicit = opt->date_mode_explicit;
 672         ctx.abbrev = opt->diffopt.abbrev;
 673         ctx.after_subject = extra_headers;
 674         ctx.preserve_subject = opt->preserve_subject;
 675         ctx.reflog_info = opt->reflog_info;
 676         ctx.fmt = opt->commit_format;
 677         ctx.mailmap = opt->mailmap;
 678         ctx.color = opt->diffopt.use_color;
 679         ctx.expand_tabs_in_log = opt->expand_tabs_in_log;
 680         ctx.output_encoding = get_log_output_encoding();
 681         if (opt->from_ident.mail_begin && opt->from_ident.name_begin)
 682                 ctx.from_ident = &opt->from_ident;
 683         if (opt->graph)
 684                 ctx.graph_width = graph_width(opt->graph);
 685         pretty_print_commit(&ctx, commit, &msgbuf);
 686
 687         if (opt->add_signoff)
 688                 append_signoff(&msgbuf, 0, APPEND_SIGNOFF_DEDUP);
 689
 690         if ((ctx.fmt != CMIT_FMT_USERFORMAT) &&
 691             ctx.notes_message && *ctx.notes_message) {
 692                 if (cmit_fmt_is_mail(ctx.fmt)) {
 693                         strbuf_addstr(&msgbuf, "---\n");
 694                         opt->shown_dashes = 1;
 695                 }
 696                 strbuf_addstr(&msgbuf, ctx.notes_message);
 697         }
 698
 699         if (opt->show_log_size) {
 700                 fprintf(opt->diffopt.file, "log size %i\n", (int)msgbuf.len);
 701                 graph_show_oneline(opt->graph);
 702         }
 703
 704         /*
 705          * Set opt->missing_newline if msgbuf doesn't
 706          * end in a newline (including if it is empty)
 707          */
 708         if (!msgbuf.len || msgbuf.buf[msgbuf.len - 1] != '\n')
 709                 opt->missing_newline = 1;
 710         else
 711                 opt->missing_newline = 0;
 712
 713         graph_show_commit_msg(opt->graph, opt->diffopt.file, &msgbuf);
 714         if (opt->use_terminator && !commit_format_is_empty(opt->commit_format)) {
 715                 if (!opt->missing_newline)
 716                         graph_show_padding(opt->graph);
 717                 putc(opt->diffopt.line_termination, opt->diffopt.file);
 718         }
 719
 720         strbuf_release(&msgbuf);
 721         free(ctx.notes_message);
 722 }
 723
 724 int log_tree_diff_flush(struct rev_info *opt)
 725 {
 726         opt->shown_dashes = 0;
 727         diffcore_std(&opt->diffopt);
 728
 729         if (diff_queue_is_empty()) {
 730                 int saved_fmt = opt->diffopt.output_format;
 731                 opt->diffopt.output_format = DIFF_FORMAT_NO_OUTPUT;
 732                 diff_flush(&opt->diffopt);
 733                 opt->diffopt.output_format = saved_fmt;
 734                 return 0;
 735         }
 736
 737         if (opt->loginfo && !opt->no_commit_id) {
 738                 show_log(opt);
 739                 if ((opt->diffopt.output_format & ~DIFF_FORMAT_NO_OUTPUT) &&
 740                     opt->verbose_header &&
 741                     opt->commit_format != CMIT_FMT_ONELINE &&
 742                     !commit_format_is_empty(opt->commit_format)) {
 743                         /*
 744                          * When showing a verbose header (i.e. log message),
 745                          * and not in --pretty=oneline format, we would want
 746                          * an extra newline between the end of log and the
 747                          * diff/diffstat output for readability.
 748                          */
 749                         int pch = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_PATCH;
 750                         if (opt->diffopt.output_prefix) {
 751                                 struct strbuf *msg = NULL;
 752                                 msg = opt->diffopt.output_prefix(&opt->diffopt,
 753                                         opt->diffopt.output_prefix_data);
 754                                 fwrite(msg->buf, msg->len, 1, opt->diffopt.file);
 755                         }
 756
 757                         /*
 758                          * We may have shown three-dashes line early
 759                          * between notes and the log message, in which
 760                          * case we only want a blank line after the
 761                          * notes without (an extra) three-dashes line.
 762                          * Otherwise, we show the three-dashes line if
 763                          * we are showing the patch with diffstat, but
 764                          * in that case, there is no extra blank line
 765                          * after the three-dashes line.
 766                          */
 767                         if (!opt->shown_dashes &&
 768                             (pch & opt->diffopt.output_format) == pch)
 769                                 fprintf(opt->diffopt.file, "---");
 770                         putc('\n', opt->diffopt.file);
 771                 }
 772         }
 773         diff_flush(&opt->diffopt);
 774         return 1;
 775 }
 776
 777 static int do_diff_combined(struct rev_info *opt, struct commit *commit)
 778 {
 779         diff_tree_combined_merge(commit, opt->dense_combined_merges, opt);
 780         return !opt->loginfo;
 781 }
 782
 783 /*
 784  * Show the diff of a commit.
 785  *
 786  * Return true if we printed any log info messages
 787  */
 788 static int log_tree_diff(struct rev_info *opt, struct commit *commit, struct log_info *log)
 789 {
 790         int showed_log;
 791         struct commit_list *parents;
 792         struct object_id *oid;
 793
 794         if (!opt->diff && !opt->diffopt.flags.exit_with_status)
 795                 return 0;
 796
 797         parse_commit_or_die(commit);
 798         oid = get_commit_tree_oid(commit);
 799
 800         /* Root commit? */
 801         parents = get_saved_parents(opt, commit);
 802         if (!parents) {
 803                 if (opt->show_root_diff) {
 804                         diff_root_tree_oid(oid, "", &opt->diffopt);
 805                         log_tree_diff_flush(opt);
 806                 }
 807                 return !opt->loginfo;
 808         }
 809
 810         /* More than one parent? */
 811         if (parents && parents->next) {
 812                 if (opt->ignore_merges)
 813                         return 0;
 814                 else if (opt->combine_merges)
 815                         return do_diff_combined(opt, commit);
 816                 else if (opt->first_parent_only) {
 817                         /*
 818                          * Generate merge log entry only for the first
 819                          * parent, showing summary diff of the others
 820                          * we merged _in_.
 821                          */
 822                         parse_commit_or_die(parents->item);
 823                         diff_tree_oid(get_commit_tree_oid(parents->item),
 824                                       oid, "", &opt->diffopt);
 825                         log_tree_diff_flush(opt);
 826                         return !opt->loginfo;
 827                 }
 828
 829                 /* If we show individual diffs, show the parent info */
 830                 log->parent = parents->item;
 831         }
 832
 833         showed_log = 0;
 834         for (;;) {
 835                 struct commit *parent = parents->item;
 836
 837                 parse_commit_or_die(parent);
 838                 diff_tree_oid(get_commit_tree_oid(parent),
 839                               oid, "", &opt->diffopt);
 840                 log_tree_diff_flush(opt);
 841
 842                 showed_log |= !opt->loginfo;
 843
 844                 /* Set up the log info for the next parent, if any.. */
 845                 parents = parents->next;
 846                 if (!parents)
 847                         break;
 848                 log->parent = parents->item;
 849                 opt->loginfo = log;
 850         }
 851         return showed_log;
 852 }
 853
 854 int log_tree_commit(struct rev_info *opt, struct commit *commit)
 855 {
 856         struct log_info log;
 857         int shown, close_file = opt->diffopt.close_file;
 858
 859         log.commit = commit;
 860         log.parent = NULL;
 861         opt->loginfo = &log;
 862         opt->diffopt.close_file = 0;
 863
 864         if (opt->line_level_traverse)
 865                 return line_log_print(opt, commit);
 866
 867         if (opt->track_linear && !opt->linear && !opt->reverse_output_stage)
 868                 fprintf(opt->diffopt.file, "\n%s\n", opt->break_bar);
 869         shown = log_tree_diff(opt, commit, &log);
 870         if (!shown && opt->loginfo && opt->always_show_header) {
 871                 log.parent = NULL;
 872                 show_log(opt);
 873                 shown = 1;
 874         }
 875         if (opt->track_linear && !opt->linear && opt->reverse_output_stage)
 876                 fprintf(opt->diffopt.file, "\n%s\n", opt->break_bar);
 877         opt->loginfo = NULL;
 878         maybe_flush_or_die(opt->diffopt.file, "stdout");
 879         if (close_file)
 880                 fclose(opt->diffopt.file);
 881         return shown;
 882 }