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
  98         assert(cb_data == NULL);
  99
 100         if (starts_with(refname, git_replace_ref_base)) {
 101                 struct object_id original_oid;
 102                 if (!check_replace_refs)
 103                         return 0;
 104                 if (get_oid_hex(refname + strlen(git_replace_ref_base),
 105                                 &original_oid)) {
 106                         warning("invalid replace ref %s", refname);
 107                         return 0;
 108                 }
 109                 obj = parse_object(&original_oid);
 110                 if (obj)
 111                         add_name_decoration(DECORATION_GRAFTED, "replaced", obj);
 112                 return 0;
 113         }
 114
 115         obj = parse_object(oid);
 116         if (!obj)
 117                 return 0;
 118
 119         if (starts_with(refname, "refs/heads/"))
 120                 type = DECORATION_REF_LOCAL;
 121         else if (starts_with(refname, "refs/remotes/"))
 122                 type = DECORATION_REF_REMOTE;
 123         else if (starts_with(refname, "refs/tags/"))
 124                 type = DECORATION_REF_TAG;
 125         else if (!strcmp(refname, "refs/stash"))
 126                 type = DECORATION_REF_STASH;
 127         else if (!strcmp(refname, "HEAD"))
 128                 type = DECORATION_REF_HEAD;
 129
 130         add_name_decoration(type, refname, obj);
 131         while (obj->type == OBJ_TAG) {
 132                 obj = ((struct tag *)obj)->tagged;
 133                 if (!obj)
 134                         break;
 135                 if (!obj->parsed)
 136                         parse_object(&obj->oid);
 137                 add_name_decoration(DECORATION_REF_TAG, refname, obj);
 138         }
 139         return 0;
 140 }
 141
 142 static int add_graft_decoration(const struct commit_graft *graft, void *cb_data)
 143 {
 144         struct commit *commit = lookup_commit(&graft->oid);
 145         if (!commit)
 146                 return 0;
 147         add_name_decoration(DECORATION_GRAFTED, "grafted", &commit->object);
 148         return 0;
 149 }
 150
 151 void load_ref_decorations(int flags)
 152 {
 153         if (!decoration_loaded) {
 154
 155                 decoration_loaded = 1;
 156                 decoration_flags = flags;
 157                 for_each_ref(add_ref_decoration, NULL);
 158                 head_ref(add_ref_decoration, NULL);
 159                 for_each_commit_graft(add_graft_decoration, NULL);
 160         }
 161 }
 162
 163 static void show_parents(struct commit *commit, int abbrev, FILE *file)
 164 {
 165         struct commit_list *p;
 166         for (p = commit->parents; p ; p = p->next) {
 167                 struct commit *parent = p->item;
 168                 fprintf(file, " %s", find_unique_abbrev(parent->object.oid.hash, abbrev));
 169         }
 170 }
 171
 172 static void show_children(struct rev_info *opt, struct commit *commit, int abbrev)
 173 {
 174         struct commit_list *p = lookup_decoration(&opt->children, &commit->object);
 175         for ( ; p; p = p->next) {
 176                 fprintf(opt->diffopt.file, " %s", find_unique_abbrev(p->item->object.oid.hash, abbrev));
 177         }
 178 }
 179
 180 /*
 181  * Do we have HEAD in the output, and also the branch it points at?
 182  * If so, find that decoration entry for that current branch.
 183  */
 184 static const struct name_decoration *current_pointed_by_HEAD(const struct name_decoration *decoration)
 185 {
 186         const struct name_decoration *list, *head = NULL;
 187         const char *branch_name = NULL;
 188         struct object_id unused;
 189         int rru_flags;
 190
 191         /* First find HEAD */
 192         for (list = decoration; list; list = list->next)
 193                 if (list->type == DECORATION_REF_HEAD) {
 194                         head = list;
 195                         break;
 196                 }
 197         if (!head)
 198                 return NULL;
 199
 200         /* Now resolve and find the matching current branch */
 201         branch_name = resolve_ref_unsafe("HEAD", 0, unused.hash, &rru_flags);
 202         if (!(rru_flags & REF_ISSYMREF))
 203                 return NULL;
 204
 205         if (!starts_with(branch_name, "refs/"))
 206                 return NULL;
 207
 208         /* OK, do we have that ref in the list? */
 209         for (list = decoration; list; list = list->next)
 210                 if ((list->type == DECORATION_REF_LOCAL) &&
 211                     !strcmp(branch_name, list->name)) {
 212                         return list;
 213                 }
 214
 215         return NULL;
 216 }
 217
 218 static void show_name(struct strbuf *sb, const struct name_decoration *decoration)
 219 {
 220         if (decoration_flags == DECORATE_SHORT_REFS)
 221                 strbuf_addstr(sb, prettify_refname(decoration->name));
 222         else
 223                 strbuf_addstr(sb, decoration->name);
 224 }
 225
 226 /*
 227  * The caller makes sure there is no funny color before calling.
 228  * format_decorations_extended makes sure the same after return.
 229  */
 230 void format_decorations_extended(struct strbuf *sb,
 231                         const struct commit *commit,
 232                         int use_color,
 233                         const char *prefix,
 234                         const char *separator,
 235                         const char *suffix)
 236 {
 237         const struct name_decoration *decoration;
 238         const struct name_decoration *current_and_HEAD;
 239         const char *color_commit =
 240                 diff_get_color(use_color, DIFF_COMMIT);
 241         const char *color_reset =
 242                 decorate_get_color(use_color, DECORATION_NONE);
 243
 244         decoration = get_name_decoration(&commit->object);
 245         if (!decoration)
 246                 return;
 247
 248         current_and_HEAD = current_pointed_by_HEAD(decoration);
 249         while (decoration) {
 250                 /*
 251                  * When both current and HEAD are there, only
 252                  * show HEAD->current where HEAD would have
 253                  * appeared, skipping the entry for current.
 254                  */
 255                 if (decoration != current_and_HEAD) {
 256                         strbuf_addstr(sb, color_commit);
 257                         strbuf_addstr(sb, prefix);
 258                         strbuf_addstr(sb, color_reset);
 259                         strbuf_addstr(sb, decorate_get_color(use_color, decoration->type));
 260                         if (decoration->type == DECORATION_REF_TAG)
 261                                 strbuf_addstr(sb, "tag: ");
 262
 263                         show_name(sb, decoration);
 264
 265                         if (current_and_HEAD &&
 266                             decoration->type == DECORATION_REF_HEAD) {
 267                                 strbuf_addstr(sb, " -> ");
 268                                 strbuf_addstr(sb, color_reset);
 269                                 strbuf_addstr(sb, decorate_get_color(use_color, current_and_HEAD->type));
 270                                 show_name(sb, current_and_HEAD);
 271                         }
 272                         strbuf_addstr(sb, color_reset);
 273
 274                         prefix = separator;
 275                 }
 276                 decoration = decoration->next;
 277         }
 278         strbuf_addstr(sb, color_commit);
 279         strbuf_addstr(sb, suffix);
 280         strbuf_addstr(sb, color_reset);
 281 }
 282
 283 void show_decorations(struct rev_info *opt, struct commit *commit)
 284 {
 285         struct strbuf sb = STRBUF_INIT;
 286
 287         if (opt->show_source && commit->util)
 288                 fprintf(opt->diffopt.file, "\t%s", (char *) commit->util);
 289         if (!opt->show_decorations)
 290                 return;
 291         format_decorations(&sb, commit, opt->diffopt.use_color);
 292         fputs(sb.buf, opt->diffopt.file);
 293         strbuf_release(&sb);
 294 }
 295
 296 static unsigned int digits_in_number(unsigned int number)
 297 {
 298         unsigned int i = 10, result = 1;
 299         while (i <= number) {
 300                 i *= 10;
 301                 result++;
 302         }
 303         return result;
 304 }
 305
 306 void fmt_output_subject(struct strbuf *filename,
 307                         const char *subject,
 308                         struct rev_info *info)
 309 {
 310         const char *suffix = info->patch_suffix;
 311         int nr = info->nr;
 312         int start_len = filename->len;
 313         int max_len = start_len + FORMAT_PATCH_NAME_MAX - (strlen(suffix) + 1);
 314
 315         if (0 < info->reroll_count)
 316                 strbuf_addf(filename, "v%d-", info->reroll_count);
 317         strbuf_addf(filename, "%04d-%s", nr, subject);
 318
 319         if (max_len < filename->len)
 320                 strbuf_setlen(filename, max_len);
 321         strbuf_addstr(filename, suffix);
 322 }
 323
 324 void fmt_output_commit(struct strbuf *filename,
 325                        struct commit *commit,
 326                        struct rev_info *info)
 327 {
 328         struct pretty_print_context ctx = {0};
 329         struct strbuf subject = STRBUF_INIT;
 330
 331         format_commit_message(commit, "%f", &subject, &ctx);
 332         fmt_output_subject(filename, subject.buf, info);
 333         strbuf_release(&subject);
 334 }
 335
 336 void fmt_output_email_subject(struct strbuf *sb, struct rev_info *opt)
 337 {
 338         if (opt->total > 0) {
 339                 strbuf_addf(sb, "Subject: [%s%s%0*d/%d] ",
 340                             opt->subject_prefix,
 341                             *opt->subject_prefix ? " " : "",
 342                             digits_in_number(opt->total),
 343                             opt->nr, opt->total);
 344         } else if (opt->total == 0 && opt->subject_prefix && *opt->subject_prefix) {
 345                 strbuf_addf(sb, "Subject: [%s] ",
 346                             opt->subject_prefix);
 347         } else {
 348                 strbuf_addstr(sb, "Subject: ");
 349         }
 350 }
 351
 352 void log_write_email_headers(struct rev_info *opt, struct commit *commit,
 353                              const char **extra_headers_p,
 354                              int *need_8bit_cte_p)
 355 {
 356         const char *extra_headers = opt->extra_headers;
 357         const char *name = oid_to_hex(opt->zero_commit ?
 358                                       &null_oid : &commit->object.oid);
 359
 360         *need_8bit_cte_p = 0; /* unknown */
 361
 362         fprintf(opt->diffopt.file, "From %s Mon Sep 17 00:00:00 2001\n", name);
 363         graph_show_oneline(opt->graph);
 364         if (opt->message_id) {
 365                 fprintf(opt->diffopt.file, "Message-Id: <%s>\n", opt->message_id);
 366                 graph_show_oneline(opt->graph);
 367         }
 368         if (opt->ref_message_ids && opt->ref_message_ids->nr > 0) {
 369                 int i, n;
 370                 n = opt->ref_message_ids->nr;
 371                 fprintf(opt->diffopt.file, "In-Reply-To: <%s>\n", opt->ref_message_ids->items[n-1].string);
 372                 for (i = 0; i < n; i++)
 373                         fprintf(opt->diffopt.file, "%s<%s>\n", (i > 0 ? "\t" : "References: "),
 374                                opt->ref_message_ids->items[i].string);
 375                 graph_show_oneline(opt->graph);
 376         }
 377         if (opt->mime_boundary) {
 378                 static char subject_buffer[1024];
 379                 static char buffer[1024];
 380                 struct strbuf filename =  STRBUF_INIT;
 381                 *need_8bit_cte_p = -1; /* NEVER */
 382                 snprintf(subject_buffer, sizeof(subject_buffer) - 1,
 383                          "%s"
 384                          "MIME-Version: 1.0\n"
 385                          "Content-Type: multipart/mixed;"
 386                          " boundary=\"%s%s\"\n"
 387                          "\n"
 388                          "This is a multi-part message in MIME "
 389                          "format.\n"
 390                          "--%s%s\n"
 391                          "Content-Type: text/plain; "
 392                          "charset=UTF-8; format=fixed\n"
 393                          "Content-Transfer-Encoding: 8bit\n\n",
 394                          extra_headers ? extra_headers : "",
 395                          mime_boundary_leader, opt->mime_boundary,
 396                          mime_boundary_leader, opt->mime_boundary);
 397                 extra_headers = subject_buffer;
 398
 399                 if (opt->numbered_files)
 400                         strbuf_addf(&filename, "%d", opt->nr);
 401                 else
 402                         fmt_output_commit(&filename, commit, opt);
 403                 snprintf(buffer, sizeof(buffer) - 1,
 404                          "\n--%s%s\n"
 405                          "Content-Type: text/x-patch;"
 406                          " name=\"%s\"\n"
 407                          "Content-Transfer-Encoding: 8bit\n"
 408                          "Content-Disposition: %s;"
 409                          " filename=\"%s\"\n\n",
 410                          mime_boundary_leader, opt->mime_boundary,
 411                          filename.buf,
 412                          opt->no_inline ? "attachment" : "inline",
 413                          filename.buf);
 414                 opt->diffopt.stat_sep = buffer;
 415                 strbuf_release(&filename);
 416         }
 417         *extra_headers_p = extra_headers;
 418 }
 419
 420 static void show_sig_lines(struct rev_info *opt, int status, const char *bol)
 421 {
 422         const char *color, *reset, *eol;
 423
 424         color = diff_get_color_opt(&opt->diffopt,
 425                                    status ? DIFF_WHITESPACE : DIFF_FRAGINFO);
 426         reset = diff_get_color_opt(&opt->diffopt, DIFF_RESET);
 427         while (*bol) {
 428                 eol = strchrnul(bol, '\n');
 429                 fprintf(opt->diffopt.file, "%s%.*s%s%s", color, (int)(eol - bol), bol, reset,
 430                        *eol ? "\n" : "");
 431                 graph_show_oneline(opt->graph);
 432                 bol = (*eol) ? (eol + 1) : eol;
 433         }
 434 }
 435
 436 static void show_signature(struct rev_info *opt, struct commit *commit)
 437 {
 438         struct strbuf payload = STRBUF_INIT;
 439         struct strbuf signature = STRBUF_INIT;
 440         struct strbuf gpg_output = STRBUF_INIT;
 441         int status;
 442
 443         if (parse_signed_commit(commit, &payload, &signature) <= 0)
 444                 goto out;
 445
 446         status = verify_signed_buffer(payload.buf, payload.len,
 447                                       signature.buf, signature.len,
 448                                       &gpg_output, NULL);
 449         if (status && !gpg_output.len)
 450                 strbuf_addstr(&gpg_output, "No signature\n");
 451
 452         show_sig_lines(opt, status, gpg_output.buf);
 453
 454  out:
 455         strbuf_release(&gpg_output);
 456         strbuf_release(&payload);
 457         strbuf_release(&signature);
 458 }
 459
 460 static int which_parent(const struct object_id *oid, const struct commit *commit)
 461 {
 462         int nth;
 463         const struct commit_list *parent;
 464
 465         for (nth = 0, parent = commit->parents; parent; parent = parent->next) {
 466                 if (!oidcmp(&parent->item->object.oid, oid))
 467                         return nth;
 468                 nth++;
 469         }
 470         return -1;
 471 }
 472
 473 static int is_common_merge(const struct commit *commit)
 474 {
 475         return (commit->parents
 476                 && commit->parents->next
 477                 && !commit->parents->next->next);
 478 }
 479
 480 static void show_one_mergetag(struct commit *commit,
 481                               struct commit_extra_header *extra,
 482                               void *data)
 483 {
 484         struct rev_info *opt = (struct rev_info *)data;
 485         struct object_id oid;
 486         struct tag *tag;
 487         struct strbuf verify_message;
 488         int status, nth;
 489         size_t payload_size, gpg_message_offset;
 490
 491         hash_sha1_file(extra->value, extra->len, typename(OBJ_TAG), oid.hash);
 492         tag = lookup_tag(&oid);
 493         if (!tag)
 494                 return; /* error message already given */
 495
 496         strbuf_init(&verify_message, 256);
 497         if (parse_tag_buffer(tag, extra->value, extra->len))
 498                 strbuf_addstr(&verify_message, "malformed mergetag\n");
 499         else if (is_common_merge(commit) &&
 500                  !oidcmp(&tag->tagged->oid,
 501                           &commit->parents->next->item->object.oid))
 502                 strbuf_addf(&verify_message,
 503                             "merged tag '%s'\n", tag->tag);
 504         else if ((nth = which_parent(&tag->tagged->oid, commit)) < 0)
 505                 strbuf_addf(&verify_message, "tag %s names a non-parent %s\n",
 506                                     tag->tag, tag->tagged->oid.hash);
 507         else
 508                 strbuf_addf(&verify_message,
 509                             "parent #%d, tagged '%s'\n", nth + 1, tag->tag);
 510         gpg_message_offset = verify_message.len;
 511
 512         payload_size = parse_signature(extra->value, extra->len);
 513         status = -1;
 514         if (extra->len > payload_size) {
 515                 /* could have a good signature */
 516                 if (!verify_signed_buffer(extra->value, payload_size,
 517                                           extra->value + payload_size,
 518                                           extra->len - payload_size,
 519                                           &verify_message, NULL))
 520                         status = 0; /* good */
 521                 else if (verify_message.len <= gpg_message_offset)
 522                         strbuf_addstr(&verify_message, "No signature\n");
 523                 /* otherwise we couldn't verify, which is shown as bad */
 524         }
 525
 526         show_sig_lines(opt, status, verify_message.buf);
 527         strbuf_release(&verify_message);
 528 }
 529
 530 static void show_mergetag(struct rev_info *opt, struct commit *commit)
 531 {
 532         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.hash, 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);
 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.hash, abbrev_commit),
 613                       opt->diffopt.file);
 614                 if (opt->print_parents)
 615                         show_parents(commit, abbrev_commit, opt->diffopt.file);
 616                 if (opt->children.name)
 617                         show_children(opt, commit, abbrev_commit);
 618                 if (parent)
 619                         fprintf(opt->diffopt.file, " (from %s)",
 620                                find_unique_abbrev(parent->object.oid.hash,
 621                                                   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 (!get_cached_commit_buffer(commit, NULL))
 652                 return;
 653
 654         if (opt->show_notes) {
 655                 int raw;
 656                 struct strbuf notebuf = STRBUF_INIT;
 657
 658                 raw = (opt->commit_format == CMIT_FMT_USERFORMAT);
 659                 format_display_notes(&commit->object.oid, &notebuf,
 660                                      get_log_output_encoding(), raw);
 661                 ctx.notes_message = notebuf.len
 662                         ? strbuf_detach(&notebuf, NULL)
 663                         : xcalloc(1, 1);
 664         }
 665
 666         /*
 667          * And then the pretty-printed message itself
 668          */
 669         if (ctx.need_8bit_cte >= 0 && opt->add_signoff)
 670                 ctx.need_8bit_cte =
 671                         has_non_ascii(fmt_name(getenv("GIT_COMMITTER_NAME"),
 672                                                getenv("GIT_COMMITTER_EMAIL")));
 673         ctx.date_mode = opt->date_mode;
 674         ctx.date_mode_explicit = opt->date_mode_explicit;
 675         ctx.abbrev = opt->diffopt.abbrev;
 676         ctx.after_subject = extra_headers;
 677         ctx.preserve_subject = opt->preserve_subject;
 678         ctx.reflog_info = opt->reflog_info;
 679         ctx.fmt = opt->commit_format;
 680         ctx.mailmap = opt->mailmap;
 681         ctx.color = opt->diffopt.use_color;
 682         ctx.expand_tabs_in_log = opt->expand_tabs_in_log;
 683         ctx.output_encoding = get_log_output_encoding();
 684         if (opt->from_ident.mail_begin && opt->from_ident.name_begin)
 685                 ctx.from_ident = &opt->from_ident;
 686         if (opt->graph)
 687                 ctx.graph_width = graph_width(opt->graph);
 688         pretty_print_commit(&ctx, commit, &msgbuf);
 689
 690         if (opt->add_signoff)
 691                 append_signoff(&msgbuf, 0, APPEND_SIGNOFF_DEDUP);
 692
 693         if ((ctx.fmt != CMIT_FMT_USERFORMAT) &&
 694             ctx.notes_message && *ctx.notes_message) {
 695                 if (cmit_fmt_is_mail(ctx.fmt)) {
 696                         strbuf_addstr(&msgbuf, "---\n");
 697                         opt->shown_dashes = 1;
 698                 }
 699                 strbuf_addstr(&msgbuf, ctx.notes_message);
 700         }
 701
 702         if (opt->show_log_size) {
 703                 fprintf(opt->diffopt.file, "log size %i\n", (int)msgbuf.len);
 704                 graph_show_oneline(opt->graph);
 705         }
 706
 707         /*
 708          * Set opt->missing_newline if msgbuf doesn't
 709          * end in a newline (including if it is empty)
 710          */
 711         if (!msgbuf.len || msgbuf.buf[msgbuf.len - 1] != '\n')
 712                 opt->missing_newline = 1;
 713         else
 714                 opt->missing_newline = 0;
 715
 716         graph_show_commit_msg(opt->graph, opt->diffopt.file, &msgbuf);
 717         if (opt->use_terminator && !commit_format_is_empty(opt->commit_format)) {
 718                 if (!opt->missing_newline)
 719                         graph_show_padding(opt->graph);
 720                 putc(opt->diffopt.line_termination, opt->diffopt.file);
 721         }
 722
 723         strbuf_release(&msgbuf);
 724         free(ctx.notes_message);
 725 }
 726
 727 int log_tree_diff_flush(struct rev_info *opt)
 728 {
 729         opt->shown_dashes = 0;
 730         diffcore_std(&opt->diffopt);
 731
 732         if (diff_queue_is_empty()) {
 733                 int saved_fmt = opt->diffopt.output_format;
 734                 opt->diffopt.output_format = DIFF_FORMAT_NO_OUTPUT;
 735                 diff_flush(&opt->diffopt);
 736                 opt->diffopt.output_format = saved_fmt;
 737                 return 0;
 738         }
 739
 740         if (opt->loginfo && !opt->no_commit_id) {
 741                 show_log(opt);
 742                 if ((opt->diffopt.output_format & ~DIFF_FORMAT_NO_OUTPUT) &&
 743                     opt->verbose_header &&
 744                     opt->commit_format != CMIT_FMT_ONELINE &&
 745                     !commit_format_is_empty(opt->commit_format)) {
 746                         /*
 747                          * When showing a verbose header (i.e. log message),
 748                          * and not in --pretty=oneline format, we would want
 749                          * an extra newline between the end of log and the
 750                          * diff/diffstat output for readability.
 751                          */
 752                         int pch = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_PATCH;
 753                         if (opt->diffopt.output_prefix) {
 754                                 struct strbuf *msg = NULL;
 755                                 msg = opt->diffopt.output_prefix(&opt->diffopt,
 756                                         opt->diffopt.output_prefix_data);
 757                                 fwrite(msg->buf, msg->len, 1, opt->diffopt.file);
 758                         }
 759
 760                         /*
 761                          * We may have shown three-dashes line early
 762                          * between notes and the log message, in which
 763                          * case we only want a blank line after the
 764                          * notes without (an extra) three-dashes line.
 765                          * Otherwise, we show the three-dashes line if
 766                          * we are showing the patch with diffstat, but
 767                          * in that case, there is no extra blank line
 768                          * after the three-dashes line.
 769                          */
 770                         if (!opt->shown_dashes &&
 771                             (pch & opt->diffopt.output_format) == pch)
 772                                 fprintf(opt->diffopt.file, "---");
 773                         putc('\n', opt->diffopt.file);
 774                 }
 775         }
 776         diff_flush(&opt->diffopt);
 777         return 1;
 778 }
 779
 780 static int do_diff_combined(struct rev_info *opt, struct commit *commit)
 781 {
 782         diff_tree_combined_merge(commit, opt->dense_combined_merges, opt);
 783         return !opt->loginfo;
 784 }
 785
 786 /*
 787  * Show the diff of a commit.
 788  *
 789  * Return true if we printed any log info messages
 790  */
 791 static int log_tree_diff(struct rev_info *opt, struct commit *commit, struct log_info *log)
 792 {
 793         int showed_log;
 794         struct commit_list *parents;
 795         struct object_id *oid;
 796
 797         if (!opt->diff && !DIFF_OPT_TST(&opt->diffopt, EXIT_WITH_STATUS))
 798                 return 0;
 799
 800         parse_commit_or_die(commit);
 801         oid = &commit->tree->object.oid;
 802
 803         /* Root commit? */
 804         parents = get_saved_parents(opt, commit);
 805         if (!parents) {
 806                 if (opt->show_root_diff) {
 807                         diff_root_tree_oid(oid, "", &opt->diffopt);
 808                         log_tree_diff_flush(opt);
 809                 }
 810                 return !opt->loginfo;
 811         }
 812
 813         /* More than one parent? */
 814         if (parents && parents->next) {
 815                 if (opt->ignore_merges)
 816                         return 0;
 817                 else if (opt->combine_merges)
 818                         return do_diff_combined(opt, commit);
 819                 else if (opt->first_parent_only) {
 820                         /*
 821                          * Generate merge log entry only for the first
 822                          * parent, showing summary diff of the others
 823                          * we merged _in_.
 824                          */
 825                         parse_commit_or_die(parents->item);
 826                         diff_tree_oid(&parents->item->tree->object.oid,
 827                                       oid, "", &opt->diffopt);
 828                         log_tree_diff_flush(opt);
 829                         return !opt->loginfo;
 830                 }
 831
 832                 /* If we show individual diffs, show the parent info */
 833                 log->parent = parents->item;
 834         }
 835
 836         showed_log = 0;
 837         for (;;) {
 838                 struct commit *parent = parents->item;
 839
 840                 parse_commit_or_die(parent);
 841                 diff_tree_oid(&parent->tree->object.oid,
 842                               oid, "", &opt->diffopt);
 843                 log_tree_diff_flush(opt);
 844
 845                 showed_log |= !opt->loginfo;
 846
 847                 /* Set up the log info for the next parent, if any.. */
 848                 parents = parents->next;
 849                 if (!parents)
 850                         break;
 851                 log->parent = parents->item;
 852                 opt->loginfo = log;
 853         }
 854         return showed_log;
 855 }
 856
 857 int log_tree_commit(struct rev_info *opt, struct commit *commit)
 858 {
 859         struct log_info log;
 860         int shown, close_file = opt->diffopt.close_file;
 861
 862         log.commit = commit;
 863         log.parent = NULL;
 864         opt->loginfo = &log;
 865         opt->diffopt.close_file = 0;
 866
 867         if (opt->line_level_traverse)
 868                 return line_log_print(opt, commit);
 869
 870         if (opt->track_linear && !opt->linear && !opt->reverse_output_stage)
 871                 fprintf(opt->diffopt.file, "\n%s\n", opt->break_bar);
 872         shown = log_tree_diff(opt, commit, &log);
 873         if (!shown && opt->loginfo && opt->always_show_header) {
 874                 log.parent = NULL;
 875                 show_log(opt);
 876                 shown = 1;
 877         }
 878         if (opt->track_linear && !opt->linear && opt->reverse_output_stage)
 879                 fprintf(opt->diffopt.file, "\n%s\n", opt->break_bar);
 880         opt->loginfo = NULL;
 881         maybe_flush_or_die(opt->diffopt.file, "stdout");
 882         if (close_file)
 883                 fclose(opt->diffopt.file);
 884         return shown;
 885 }