log-tree.c

   1 #include "cache.h"
   2 #include "diff.h"
   3 #include "commit.h"
   4 #include "tag.h"
   5 #include "graph.h"
   6 #include "log-tree.h"
   7 #include "reflog-walk.h"
   8 #include "refs.h"
   9 #include "string-list.h"
  10 #include "color.h"
  11 #include "gpg-interface.h"
  12 #include "sequencer.h"
  13 #include "line-log.h"
  14
  15 static struct decoration name_decoration = { "object names" };
  16 static int decoration_loaded;
  17 static int decoration_flags;
  18
  19 static char decoration_colors[][COLOR_MAXLEN] = {
  20         GIT_COLOR_RESET,
  21         GIT_COLOR_BOLD_GREEN,   /* REF_LOCAL */
  22         GIT_COLOR_BOLD_RED,     /* REF_REMOTE */
  23         GIT_COLOR_BOLD_YELLOW,  /* REF_TAG */
  24         GIT_COLOR_BOLD_MAGENTA, /* REF_STASH */
  25         GIT_COLOR_BOLD_CYAN,    /* REF_HEAD */
  26         GIT_COLOR_BOLD_BLUE,    /* GRAFTED */
  27 };
  28
  29 static const char *decorate_get_color(int decorate_use_color, enum decoration_type ix)
  30 {
  31         if (want_color(decorate_use_color))
  32                 return decoration_colors[ix];
  33         return "";
  34 }
  35
  36 static int parse_decorate_color_slot(const char *slot)
  37 {
  38         /*
  39          * We're comparing with 'ignore-case' on
  40          * (because config.c sets them all tolower),
  41          * but let's match the letters in the literal
  42          * string values here with how they are
  43          * documented in Documentation/config.txt, for
  44          * consistency.
  45          *
  46          * We love being consistent, don't we?
  47          */
  48         if (!strcasecmp(slot, "branch"))
  49                 return DECORATION_REF_LOCAL;
  50         if (!strcasecmp(slot, "remoteBranch"))
  51                 return DECORATION_REF_REMOTE;
  52         if (!strcasecmp(slot, "tag"))
  53                 return DECORATION_REF_TAG;
  54         if (!strcasecmp(slot, "stash"))
  55                 return DECORATION_REF_STASH;
  56         if (!strcasecmp(slot, "HEAD"))
  57                 return DECORATION_REF_HEAD;
  58         return -1;
  59 }
  60
  61 int parse_decorate_color_config(const char *var, const char *slot_name, const char *value)
  62 {
  63         int slot = parse_decorate_color_slot(slot_name);
  64         if (slot < 0)
  65                 return 0;
  66         if (!value)
  67                 return config_error_nonbool(var);
  68         return color_parse(value, decoration_colors[slot]);
  69 }
  70
  71 /*
  72  * log-tree.c uses DIFF_OPT_TST for determining whether to use color
  73  * for showing the commit sha1, use the same check for --decorate
  74  */
  75 #define decorate_get_color_opt(o, ix) \
  76         decorate_get_color((o)->use_color, ix)
  77
  78 void add_name_decoration(enum decoration_type type, const char *name, struct object *obj)
  79 {
  80         int nlen = strlen(name);
  81         struct name_decoration *res = xmalloc(sizeof(*res) + nlen + 1);
  82         memcpy(res->name, name, nlen + 1);
  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, "refs/replace/")) {
 101                 struct object_id original_oid;
 102                 if (!check_replace_refs)
 103                         return 0;
 104                 if (get_oid_hex(refname + 13, &original_oid)) {
 105                         warning("invalid replace ref %s", refname);
 106                         return 0;
 107                 }
 108                 obj = parse_object(original_oid.hash);
 109                 if (obj)
 110                         add_name_decoration(DECORATION_GRAFTED, "replaced", obj);
 111                 return 0;
 112         }
 113
 114         obj = parse_object(oid->hash);
 115         if (!obj)
 116                 return 0;
 117
 118         if (starts_with(refname, "refs/heads/"))
 119                 type = DECORATION_REF_LOCAL;
 120         else if (starts_with(refname, "refs/remotes/"))
 121                 type = DECORATION_REF_REMOTE;
 122         else if (starts_with(refname, "refs/tags/"))
 123                 type = DECORATION_REF_TAG;
 124         else if (!strcmp(refname, "refs/stash"))
 125                 type = DECORATION_REF_STASH;
 126         else if (!strcmp(refname, "HEAD"))
 127                 type = DECORATION_REF_HEAD;
 128
 129         add_name_decoration(type, refname, obj);
 130         while (obj->type == OBJ_TAG) {
 131                 obj = ((struct tag *)obj)->tagged;
 132                 if (!obj)
 133                         break;
 134                 if (!obj->parsed)
 135                         parse_object(obj->sha1);
 136                 add_name_decoration(DECORATION_REF_TAG, refname, obj);
 137         }
 138         return 0;
 139 }
 140
 141 static int add_graft_decoration(const struct commit_graft *graft, void *cb_data)
 142 {
 143         struct commit *commit = lookup_commit(graft->oid.hash);
 144         if (!commit)
 145                 return 0;
 146         add_name_decoration(DECORATION_GRAFTED, "grafted", &commit->object);
 147         return 0;
 148 }
 149
 150 void load_ref_decorations(int flags)
 151 {
 152         if (!decoration_loaded) {
 153
 154                 decoration_loaded = 1;
 155                 decoration_flags = flags;
 156                 for_each_ref(add_ref_decoration, NULL);
 157                 head_ref(add_ref_decoration, NULL);
 158                 for_each_commit_graft(add_graft_decoration, NULL);
 159         }
 160 }
 161
 162 static void show_parents(struct commit *commit, int abbrev)
 163 {
 164         struct commit_list *p;
 165         for (p = commit->parents; p ; p = p->next) {
 166                 struct commit *parent = p->item;
 167                 printf(" %s", find_unique_abbrev(parent->object.sha1, 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                 printf(" %s", find_unique_abbrev(p->item->object.sha1, 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         unsigned char unused[20];
 188         int rru_flags;
 189
 190         /* First find HEAD */
 191         for (list = decoration; list; list = list->next)
 192                 if (list->type == DECORATION_REF_HEAD) {
 193                         head = list;
 194                         break;
 195                 }
 196         if (!head)
 197                 return NULL;
 198
 199         /* Now resolve and find the matching current branch */
 200         branch_name = resolve_ref_unsafe("HEAD", 0, unused, &rru_flags);
 201         if (!(rru_flags & REF_ISSYMREF))
 202                 return NULL;
 203
 204         if (!starts_with(branch_name, "refs/"))
 205                 return NULL;
 206
 207         /* OK, do we have that ref in the list? */
 208         for (list = decoration; list; list = list->next)
 209                 if ((list->type == DECORATION_REF_LOCAL) &&
 210                     !strcmp(branch_name, list->name)) {
 211                         return list;
 212                 }
 213
 214         return NULL;
 215 }
 216
 217 static void show_name(struct strbuf *sb, const struct name_decoration *decoration)
 218 {
 219         if (decoration_flags == DECORATE_SHORT_REFS)
 220                 strbuf_addstr(sb, prettify_refname(decoration->name));
 221         else
 222                 strbuf_addstr(sb, decoration->name);
 223 }
 224
 225 /*
 226  * The caller makes sure there is no funny color before calling.
 227  * format_decorations_extended makes sure the same after return.
 228  */
 229 void format_decorations_extended(struct strbuf *sb,
 230                         const struct commit *commit,
 231                         int use_color,
 232                         const char *prefix,
 233                         const char *separator,
 234                         const char *suffix)
 235 {
 236         const struct name_decoration *decoration;
 237         const struct name_decoration *current_and_HEAD;
 238         const char *color_commit =
 239                 diff_get_color(use_color, DIFF_COMMIT);
 240         const char *color_reset =
 241                 decorate_get_color(use_color, DECORATION_NONE);
 242
 243         decoration = get_name_decoration(&commit->object);
 244         if (!decoration)
 245                 return;
 246
 247         current_and_HEAD = current_pointed_by_HEAD(decoration);
 248         while (decoration) {
 249                 /*
 250                  * When both current and HEAD are there, only
 251                  * show HEAD->current where HEAD would have
 252                  * appeared, skipping the entry for current.
 253                  */
 254                 if (decoration != current_and_HEAD) {
 255                         strbuf_addstr(sb, color_commit);
 256                         strbuf_addstr(sb, prefix);
 257                         strbuf_addstr(sb, color_reset);
 258                         strbuf_addstr(sb, decorate_get_color(use_color, decoration->type));
 259                         if (decoration->type == DECORATION_REF_TAG)
 260                                 strbuf_addstr(sb, "tag: ");
 261
 262                         show_name(sb, decoration);
 263
 264                         if (current_and_HEAD &&
 265                             decoration->type == DECORATION_REF_HEAD) {
 266                                 strbuf_addstr(sb, color_reset);
 267                                 strbuf_addstr(sb, color_commit);
 268                                 strbuf_addstr(sb, " -> ");
 269                                 strbuf_addstr(sb, color_reset);
 270                                 strbuf_addstr(sb, decorate_get_color(use_color, current_and_HEAD->type));
 271                                 show_name(sb, current_and_HEAD);
 272                         }
 273                         strbuf_addstr(sb, color_reset);
 274
 275                         prefix = separator;
 276                 }
 277                 decoration = decoration->next;
 278         }
 279         strbuf_addstr(sb, color_commit);
 280         strbuf_addstr(sb, suffix);
 281         strbuf_addstr(sb, color_reset);
 282 }
 283
 284 void show_decorations(struct rev_info *opt, struct commit *commit)
 285 {
 286         struct strbuf sb = STRBUF_INIT;
 287
 288         if (opt->show_source && commit->util)
 289                 printf("\t%s", (char *) commit->util);
 290         if (!opt->show_decorations)
 291                 return;
 292         format_decorations(&sb, commit, opt->diffopt.use_color);
 293         fputs(sb.buf, stdout);
 294         strbuf_release(&sb);
 295 }
 296
 297 static unsigned int digits_in_number(unsigned int number)
 298 {
 299         unsigned int i = 10, result = 1;
 300         while (i <= number) {
 301                 i *= 10;
 302                 result++;
 303         }
 304         return result;
 305 }
 306
 307 void fmt_output_subject(struct strbuf *filename,
 308                         const char *subject,
 309                         struct rev_info *info)
 310 {
 311         const char *suffix = info->patch_suffix;
 312         int nr = info->nr;
 313         int start_len = filename->len;
 314         int max_len = start_len + FORMAT_PATCH_NAME_MAX - (strlen(suffix) + 1);
 315
 316         if (0 < info->reroll_count)
 317                 strbuf_addf(filename, "v%d-", info->reroll_count);
 318         strbuf_addf(filename, "%04d-%s", nr, subject);
 319
 320         if (max_len < filename->len)
 321                 strbuf_setlen(filename, max_len);
 322         strbuf_addstr(filename, suffix);
 323 }
 324
 325 void fmt_output_commit(struct strbuf *filename,
 326                        struct commit *commit,
 327                        struct rev_info *info)
 328 {
 329         struct pretty_print_context ctx = {0};
 330         struct strbuf subject = STRBUF_INIT;
 331
 332         format_commit_message(commit, "%f", &subject, &ctx);
 333         fmt_output_subject(filename, subject.buf, info);
 334         strbuf_release(&subject);
 335 }
 336
 337 void log_write_email_headers(struct rev_info *opt, struct commit *commit,
 338                              const char **subject_p,
 339                              const char **extra_headers_p,
 340                              int *need_8bit_cte_p)
 341 {
 342         const char *subject = NULL;
 343         const char *extra_headers = opt->extra_headers;
 344         const char *name = sha1_to_hex(commit->object.sha1);
 345
 346         *need_8bit_cte_p = 0; /* unknown */
 347         if (opt->total > 0) {
 348                 static char buffer[64];
 349                 snprintf(buffer, sizeof(buffer),
 350                          "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                 subject = buffer;
 356         } else if (opt->total == 0 && opt->subject_prefix && *opt->subject_prefix) {
 357                 static char buffer[256];
 358                 snprintf(buffer, sizeof(buffer),
 359                          "Subject: [%s] ",
 360                          opt->subject_prefix);
 361                 subject = buffer;
 362         } else {
 363                 subject = "Subject: ";
 364         }
 365
 366         printf("From %s Mon Sep 17 00:00:00 2001\n", name);
 367         graph_show_oneline(opt->graph);
 368         if (opt->message_id) {
 369                 printf("Message-Id: <%s>\n", opt->message_id);
 370                 graph_show_oneline(opt->graph);
 371         }
 372         if (opt->ref_message_ids && opt->ref_message_ids->nr > 0) {
 373                 int i, n;
 374                 n = opt->ref_message_ids->nr;
 375                 printf("In-Reply-To: <%s>\n", opt->ref_message_ids->items[n-1].string);
 376                 for (i = 0; i < n; i++)
 377                         printf("%s<%s>\n", (i > 0 ? "\t" : "References: "),
 378                                opt->ref_message_ids->items[i].string);
 379                 graph_show_oneline(opt->graph);
 380         }
 381         if (opt->mime_boundary) {
 382                 static char subject_buffer[1024];
 383                 static char buffer[1024];
 384                 struct strbuf filename =  STRBUF_INIT;
 385                 *need_8bit_cte_p = -1; /* NEVER */
 386                 snprintf(subject_buffer, sizeof(subject_buffer) - 1,
 387                          "%s"
 388                          "MIME-Version: 1.0\n"
 389                          "Content-Type: multipart/mixed;"
 390                          " boundary=\"%s%s\"\n"
 391                          "\n"
 392                          "This is a multi-part message in MIME "
 393                          "format.\n"
 394                          "--%s%s\n"
 395                          "Content-Type: text/plain; "
 396                          "charset=UTF-8; format=fixed\n"
 397                          "Content-Transfer-Encoding: 8bit\n\n",
 398                          extra_headers ? extra_headers : "",
 399                          mime_boundary_leader, opt->mime_boundary,
 400                          mime_boundary_leader, opt->mime_boundary);
 401                 extra_headers = subject_buffer;
 402
 403                 if (opt->numbered_files)
 404                         strbuf_addf(&filename, "%d", opt->nr);
 405                 else
 406                         fmt_output_commit(&filename, commit, opt);
 407                 snprintf(buffer, sizeof(buffer) - 1,
 408                          "\n--%s%s\n"
 409                          "Content-Type: text/x-patch;"
 410                          " name=\"%s\"\n"
 411                          "Content-Transfer-Encoding: 8bit\n"
 412                          "Content-Disposition: %s;"
 413                          " filename=\"%s\"\n\n",
 414                          mime_boundary_leader, opt->mime_boundary,
 415                          filename.buf,
 416                          opt->no_inline ? "attachment" : "inline",
 417                          filename.buf);
 418                 opt->diffopt.stat_sep = buffer;
 419                 strbuf_release(&filename);
 420         }
 421         *subject_p = subject;
 422         *extra_headers_p = extra_headers;
 423 }
 424
 425 static void show_sig_lines(struct rev_info *opt, int status, const char *bol)
 426 {
 427         const char *color, *reset, *eol;
 428
 429         color = diff_get_color_opt(&opt->diffopt,
 430                                    status ? DIFF_WHITESPACE : DIFF_FRAGINFO);
 431         reset = diff_get_color_opt(&opt->diffopt, DIFF_RESET);
 432         while (*bol) {
 433                 eol = strchrnul(bol, '\n');
 434                 printf("%s%.*s%s%s", color, (int)(eol - bol), bol, reset,
 435                        *eol ? "\n" : "");
 436                 graph_show_oneline(opt->graph);
 437                 bol = (*eol) ? (eol + 1) : eol;
 438         }
 439 }
 440
 441 static void show_signature(struct rev_info *opt, struct commit *commit)
 442 {
 443         struct strbuf payload = STRBUF_INIT;
 444         struct strbuf signature = STRBUF_INIT;
 445         struct strbuf gpg_output = STRBUF_INIT;
 446         int status;
 447
 448         if (parse_signed_commit(commit, &payload, &signature) <= 0)
 449                 goto out;
 450
 451         status = verify_signed_buffer(payload.buf, payload.len,
 452                                       signature.buf, signature.len,
 453                                       &gpg_output, NULL);
 454         if (status && !gpg_output.len)
 455                 strbuf_addstr(&gpg_output, "No signature\n");
 456
 457         show_sig_lines(opt, status, gpg_output.buf);
 458
 459  out:
 460         strbuf_release(&gpg_output);
 461         strbuf_release(&payload);
 462         strbuf_release(&signature);
 463 }
 464
 465 static int which_parent(const unsigned char *sha1, const struct commit *commit)
 466 {
 467         int nth;
 468         const struct commit_list *parent;
 469
 470         for (nth = 0, parent = commit->parents; parent; parent = parent->next) {
 471                 if (!hashcmp(parent->item->object.sha1, sha1))
 472                         return nth;
 473                 nth++;
 474         }
 475         return -1;
 476 }
 477
 478 static int is_common_merge(const struct commit *commit)
 479 {
 480         return (commit->parents
 481                 && commit->parents->next
 482                 && !commit->parents->next->next);
 483 }
 484
 485 static void show_one_mergetag(struct commit *commit,
 486                               struct commit_extra_header *extra,
 487                               void *data)
 488 {
 489         struct rev_info *opt = (struct rev_info *)data;
 490         unsigned char sha1[20];
 491         struct tag *tag;
 492         struct strbuf verify_message;
 493         int status, nth;
 494         size_t payload_size, gpg_message_offset;
 495
 496         hash_sha1_file(extra->value, extra->len, typename(OBJ_TAG), sha1);
 497         tag = lookup_tag(sha1);
 498         if (!tag)
 499                 return; /* error message already given */
 500
 501         strbuf_init(&verify_message, 256);
 502         if (parse_tag_buffer(tag, extra->value, extra->len))
 503                 strbuf_addstr(&verify_message, "malformed mergetag\n");
 504         else if (is_common_merge(commit) &&
 505                  !hashcmp(tag->tagged->sha1,
 506                           commit->parents->next->item->object.sha1))
 507                 strbuf_addf(&verify_message,
 508                             "merged tag '%s'\n", tag->tag);
 509         else if ((nth = which_parent(tag->tagged->sha1, commit)) < 0)
 510                 strbuf_addf(&verify_message, "tag %s names a non-parent %s\n",
 511                                     tag->tag, tag->tagged->sha1);
 512         else
 513                 strbuf_addf(&verify_message,
 514                             "parent #%d, tagged '%s'\n", nth + 1, tag->tag);
 515         gpg_message_offset = verify_message.len;
 516
 517         payload_size = parse_signature(extra->value, extra->len);
 518         status = -1;
 519         if (extra->len > payload_size) {
 520                 /* could have a good signature */
 521                 if (!verify_signed_buffer(extra->value, payload_size,
 522                                           extra->value + payload_size,
 523                                           extra->len - payload_size,
 524                                           &verify_message, NULL))
 525                         status = 0; /* good */
 526                 else if (verify_message.len <= gpg_message_offset)
 527                         strbuf_addstr(&verify_message, "No signature\n");
 528                 /* otherwise we couldn't verify, which is shown as bad */
 529         }
 530
 531         show_sig_lines(opt, status, verify_message.buf);
 532         strbuf_release(&verify_message);
 533 }
 534
 535 static void show_mergetag(struct rev_info *opt, struct commit *commit)
 536 {
 537         for_each_mergetag(show_one_mergetag, commit, opt);
 538 }
 539
 540 void show_log(struct rev_info *opt)
 541 {
 542         struct strbuf msgbuf = STRBUF_INIT;
 543         struct log_info *log = opt->loginfo;
 544         struct commit *commit = log->commit, *parent = log->parent;
 545         int abbrev_commit = opt->abbrev_commit ? opt->abbrev : 40;
 546         const char *extra_headers = opt->extra_headers;
 547         struct pretty_print_context ctx = {0};
 548
 549         opt->loginfo = NULL;
 550         if (!opt->verbose_header) {
 551                 graph_show_commit(opt->graph);
 552
 553                 if (!opt->graph)
 554                         put_revision_mark(opt, commit);
 555                 fputs(find_unique_abbrev(commit->object.sha1, abbrev_commit), stdout);
 556                 if (opt->print_parents)
 557                         show_parents(commit, abbrev_commit);
 558                 if (opt->children.name)
 559                         show_children(opt, commit, abbrev_commit);
 560                 show_decorations(opt, commit);
 561                 if (opt->graph && !graph_is_commit_finished(opt->graph)) {
 562                         putchar('\n');
 563                         graph_show_remainder(opt->graph);
 564                 }
 565                 putchar(opt->diffopt.line_termination);
 566                 return;
 567         }
 568
 569         /*
 570          * If use_terminator is set, we already handled any record termination
 571          * at the end of the last record.
 572          * Otherwise, add a diffopt.line_termination character before all
 573          * entries but the first.  (IOW, as a separator between entries)
 574          */
 575         if (opt->shown_one && !opt->use_terminator) {
 576                 /*
 577                  * If entries are separated by a newline, the output
 578                  * should look human-readable.  If the last entry ended
 579                  * with a newline, print the graph output before this
 580                  * newline.  Otherwise it will end up as a completely blank
 581                  * line and will look like a gap in the graph.
 582                  *
 583                  * If the entry separator is not a newline, the output is
 584                  * primarily intended for programmatic consumption, and we
 585                  * never want the extra graph output before the entry
 586                  * separator.
 587                  */
 588                 if (opt->diffopt.line_termination == '\n' &&
 589                     !opt->missing_newline)
 590                         graph_show_padding(opt->graph);
 591                 putchar(opt->diffopt.line_termination);
 592         }
 593         opt->shown_one = 1;
 594
 595         /*
 596          * If the history graph was requested,
 597          * print the graph, up to this commit's line
 598          */
 599         graph_show_commit(opt->graph);
 600
 601         /*
 602          * Print header line of header..
 603          */
 604
 605         if (opt->commit_format == CMIT_FMT_EMAIL) {
 606                 log_write_email_headers(opt, commit, &ctx.subject, &extra_headers,
 607                                         &ctx.need_8bit_cte);
 608         } else if (opt->commit_format != CMIT_FMT_USERFORMAT) {
 609                 fputs(diff_get_color_opt(&opt->diffopt, DIFF_COMMIT), stdout);
 610                 if (opt->commit_format != CMIT_FMT_ONELINE)
 611                         fputs("commit ", stdout);
 612
 613                 if (!opt->graph)
 614                         put_revision_mark(opt, commit);
 615                 fputs(find_unique_abbrev(commit->object.sha1, abbrev_commit),
 616                       stdout);
 617                 if (opt->print_parents)
 618                         show_parents(commit, abbrev_commit);
 619                 if (opt->children.name)
 620                         show_children(opt, commit, abbrev_commit);
 621                 if (parent)
 622                         printf(" (from %s)",
 623                                find_unique_abbrev(parent->object.sha1,
 624                                                   abbrev_commit));
 625                 fputs(diff_get_color_opt(&opt->diffopt, DIFF_RESET), stdout);
 626                 show_decorations(opt, commit);
 627                 if (opt->commit_format == CMIT_FMT_ONELINE) {
 628                         putchar(' ');
 629                 } else {
 630                         putchar('\n');
 631                         graph_show_oneline(opt->graph);
 632                 }
 633                 if (opt->reflog_info) {
 634                         /*
 635                          * setup_revisions() ensures that opt->reflog_info
 636                          * and opt->graph cannot both be set,
 637                          * so we don't need to worry about printing the
 638                          * graph info here.
 639                          */
 640                         show_reflog_message(opt->reflog_info,
 641                                             opt->commit_format == CMIT_FMT_ONELINE,
 642                                             opt->date_mode,
 643                                             opt->date_mode_explicit);
 644                         if (opt->commit_format == CMIT_FMT_ONELINE)
 645                                 return;
 646                 }
 647         }
 648
 649         if (opt->show_signature) {
 650                 show_signature(opt, commit);
 651                 show_mergetag(opt, commit);
 652         }
 653
 654         if (!get_cached_commit_buffer(commit, NULL))
 655                 return;
 656
 657         if (opt->show_notes) {
 658                 int raw;
 659                 struct strbuf notebuf = STRBUF_INIT;
 660
 661                 raw = (opt->commit_format == CMIT_FMT_USERFORMAT);
 662                 format_display_notes(commit->object.sha1, &notebuf,
 663                                      get_log_output_encoding(), raw);
 664                 ctx.notes_message = notebuf.len
 665                         ? strbuf_detach(&notebuf, NULL)
 666                         : xcalloc(1, 1);
 667         }
 668
 669         /*
 670          * And then the pretty-printed message itself
 671          */
 672         if (ctx.need_8bit_cte >= 0 && opt->add_signoff)
 673                 ctx.need_8bit_cte =
 674                         has_non_ascii(fmt_name(getenv("GIT_COMMITTER_NAME"),
 675                                                getenv("GIT_COMMITTER_EMAIL")));
 676         ctx.date_mode = opt->date_mode;
 677         ctx.date_mode_explicit = opt->date_mode_explicit;
 678         ctx.abbrev = opt->diffopt.abbrev;
 679         ctx.after_subject = extra_headers;
 680         ctx.preserve_subject = opt->preserve_subject;
 681         ctx.reflog_info = opt->reflog_info;
 682         ctx.fmt = opt->commit_format;
 683         ctx.mailmap = opt->mailmap;
 684         ctx.color = opt->diffopt.use_color;
 685         ctx.output_encoding = get_log_output_encoding();
 686         if (opt->from_ident.mail_begin && opt->from_ident.name_begin)
 687                 ctx.from_ident = &opt->from_ident;
 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 (ctx.fmt == CMIT_FMT_EMAIL) {
 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                 printf("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         if (opt->graph)
 717                 graph_show_commit_msg(opt->graph, &msgbuf);
 718         else
 719                 fwrite(msgbuf.buf, sizeof(char), msgbuf.len, stdout);
 720         if (opt->use_terminator && !commit_format_is_empty(opt->commit_format)) {
 721                 if (!opt->missing_newline)
 722                         graph_show_padding(opt->graph);
 723                 putchar(opt->diffopt.line_termination);
 724         }
 725
 726         strbuf_release(&msgbuf);
 727         free(ctx.notes_message);
 728 }
 729
 730 int log_tree_diff_flush(struct rev_info *opt)
 731 {
 732         opt->shown_dashes = 0;
 733         diffcore_std(&opt->diffopt);
 734
 735         if (diff_queue_is_empty()) {
 736                 int saved_fmt = opt->diffopt.output_format;
 737                 opt->diffopt.output_format = DIFF_FORMAT_NO_OUTPUT;
 738                 diff_flush(&opt->diffopt);
 739                 opt->diffopt.output_format = saved_fmt;
 740                 return 0;
 741         }
 742
 743         if (opt->loginfo && !opt->no_commit_id) {
 744                 show_log(opt);
 745                 if ((opt->diffopt.output_format & ~DIFF_FORMAT_NO_OUTPUT) &&
 746                     opt->verbose_header &&
 747                     opt->commit_format != CMIT_FMT_ONELINE &&
 748                     !commit_format_is_empty(opt->commit_format)) {
 749                         /*
 750                          * When showing a verbose header (i.e. log message),
 751                          * and not in --pretty=oneline format, we would want
 752                          * an extra newline between the end of log and the
 753                          * diff/diffstat output for readability.
 754                          */
 755                         int pch = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_PATCH;
 756                         if (opt->diffopt.output_prefix) {
 757                                 struct strbuf *msg = NULL;
 758                                 msg = opt->diffopt.output_prefix(&opt->diffopt,
 759                                         opt->diffopt.output_prefix_data);
 760                                 fwrite(msg->buf, msg->len, 1, stdout);
 761                         }
 762
 763                         /*
 764                          * We may have shown three-dashes line early
 765                          * between notes and the log message, in which
 766                          * case we only want a blank line after the
 767                          * notes without (an extra) three-dashes line.
 768                          * Otherwise, we show the three-dashes line if
 769                          * we are showing the patch with diffstat, but
 770                          * in that case, there is no extra blank line
 771                          * after the three-dashes line.
 772                          */
 773                         if (!opt->shown_dashes &&
 774                             (pch & opt->diffopt.output_format) == pch)
 775                                 printf("---");
 776                         putchar('\n');
 777                 }
 778         }
 779         diff_flush(&opt->diffopt);
 780         return 1;
 781 }
 782
 783 static int do_diff_combined(struct rev_info *opt, struct commit *commit)
 784 {
 785         diff_tree_combined_merge(commit, opt->dense_combined_merges, opt);
 786         return !opt->loginfo;
 787 }
 788
 789 /*
 790  * Show the diff of a commit.
 791  *
 792  * Return true if we printed any log info messages
 793  */
 794 static int log_tree_diff(struct rev_info *opt, struct commit *commit, struct log_info *log)
 795 {
 796         int showed_log;
 797         struct commit_list *parents;
 798         unsigned const char *sha1;
 799
 800         if (!opt->diff && !DIFF_OPT_TST(&opt->diffopt, EXIT_WITH_STATUS))
 801                 return 0;
 802
 803         parse_commit_or_die(commit);
 804         sha1 = commit->tree->object.sha1;
 805
 806         /* Root commit? */
 807         parents = get_saved_parents(opt, commit);
 808         if (!parents) {
 809                 if (opt->show_root_diff) {
 810                         diff_root_tree_sha1(sha1, "", &opt->diffopt);
 811                         log_tree_diff_flush(opt);
 812                 }
 813                 return !opt->loginfo;
 814         }
 815
 816         /* More than one parent? */
 817         if (parents && parents->next) {
 818                 if (opt->ignore_merges)
 819                         return 0;
 820                 else if (opt->combine_merges)
 821                         return do_diff_combined(opt, commit);
 822                 else if (opt->first_parent_only) {
 823                         /*
 824                          * Generate merge log entry only for the first
 825                          * parent, showing summary diff of the others
 826                          * we merged _in_.
 827                          */
 828                         parse_commit_or_die(parents->item);
 829                         diff_tree_sha1(parents->item->tree->object.sha1,
 830                                        sha1, "", &opt->diffopt);
 831                         log_tree_diff_flush(opt);
 832                         return !opt->loginfo;
 833                 }
 834
 835                 /* If we show individual diffs, show the parent info */
 836                 log->parent = parents->item;
 837         }
 838
 839         showed_log = 0;
 840         for (;;) {
 841                 struct commit *parent = parents->item;
 842
 843                 parse_commit_or_die(parent);
 844                 diff_tree_sha1(parent->tree->object.sha1,
 845                                sha1, "", &opt->diffopt);
 846                 log_tree_diff_flush(opt);
 847
 848                 showed_log |= !opt->loginfo;
 849
 850                 /* Set up the log info for the next parent, if any.. */
 851                 parents = parents->next;
 852                 if (!parents)
 853                         break;
 854                 log->parent = parents->item;
 855                 opt->loginfo = log;
 856         }
 857         return showed_log;
 858 }
 859
 860 int log_tree_commit(struct rev_info *opt, struct commit *commit)
 861 {
 862         struct log_info log;
 863         int shown;
 864
 865         log.commit = commit;
 866         log.parent = NULL;
 867         opt->loginfo = &log;
 868
 869         if (opt->line_level_traverse)
 870                 return line_log_print(opt, commit);
 871
 872         if (opt->track_linear && !opt->linear && !opt->reverse_output_stage)
 873                 printf("\n%s\n", opt->break_bar);
 874         shown = log_tree_diff(opt, commit, &log);
 875         if (!shown && opt->loginfo && opt->always_show_header) {
 876                 log.parent = NULL;
 877                 show_log(opt);
 878                 shown = 1;
 879         }
 880         if (opt->track_linear && !opt->linear && opt->reverse_output_stage)
 881                 printf("\n%s\n", opt->break_bar);
 882         opt->loginfo = NULL;
 883         maybe_flush_or_die(stdout, "stdout");
 884         return shown;
 885 }