git.oblomov.eu Git - git/blob - builtin/fmt-merge-msg.c

   1 #include "builtin.h"
   2 #include "cache.h"
   3 #include "commit.h"
   4 #include "diff.h"
   5 #include "revision.h"
   6 #include "tag.h"
   7 #include "string-list.h"
   8 #include "branch.h"
   9 #include "fmt-merge-msg.h"
  10 #include "gpg-interface.h"
  11
  12 static const char * const fmt_merge_msg_usage[] = {
  13         N_("git fmt-merge-msg [-m <message>] [--log[=<n>]|--no-log] [--file <file>]"),
  14         NULL
  15 };
  16
  17 static int use_branch_desc;
  18
  19 int fmt_merge_msg_config(const char *key, const char *value, void *cb)
  20 {
  21         if (!strcmp(key, "merge.log") || !strcmp(key, "merge.summary")) {
  22                 int is_bool;
  23                 merge_log_config = git_config_bool_or_int(key, value, &is_bool);
  24                 if (!is_bool && merge_log_config < 0)
  25                         return error("%s: negative length %s", key, value);
  26                 if (is_bool && merge_log_config)
  27                         merge_log_config = DEFAULT_MERGE_LOG_LEN;
  28         } else if (!strcmp(key, "merge.branchdesc")) {
  29                 use_branch_desc = git_config_bool(key, value);
  30         } else {
  31                 return git_default_config(key, value, cb);
  32         }
  33         return 0;
  34 }
  35
  36 /* merge data per repository where the merged tips came from */
  37 struct src_data {
  38         struct string_list branch, tag, r_branch, generic;
  39         int head_status;
  40 };
  41
  42 struct origin_data {
  43         unsigned char sha1[20];
  44         unsigned is_local_branch:1;
  45 };
  46
  47 static void init_src_data(struct src_data *data)
  48 {
  49         data->branch.strdup_strings = 1;
  50         data->tag.strdup_strings = 1;
  51         data->r_branch.strdup_strings = 1;
  52         data->generic.strdup_strings = 1;
  53 }
  54
  55 static struct string_list srcs = STRING_LIST_INIT_DUP;
  56 static struct string_list origins = STRING_LIST_INIT_DUP;
  57
  58 struct merge_parents {
  59         int alloc, nr;
  60         struct merge_parent {
  61                 unsigned char given[20];
  62                 unsigned char commit[20];
  63                 unsigned char used;
  64         } *item;
  65 };
  66
  67 /*
  68  * I know, I know, this is inefficient, but you won't be pulling and merging
  69  * hundreds of heads at a time anyway.
  70  */
  71 static struct merge_parent *find_merge_parent(struct merge_parents *table,
  72                                               unsigned char *given,
  73                                               unsigned char *commit)
  74 {
  75         int i;
  76         for (i = 0; i < table->nr; i++) {
  77                 if (given && hashcmp(table->item[i].given, given))
  78                         continue;
  79                 if (commit && hashcmp(table->item[i].commit, commit))
  80                         continue;
  81                 return &table->item[i];
  82         }
  83         return NULL;
  84 }
  85
  86 static void add_merge_parent(struct merge_parents *table,
  87                              unsigned char *given,
  88                              unsigned char *commit)
  89 {
  90         if (table->nr && find_merge_parent(table, given, commit))
  91                 return;
  92         ALLOC_GROW(table->item, table->nr + 1, table->alloc);
  93         hashcpy(table->item[table->nr].given, given);
  94         hashcpy(table->item[table->nr].commit, commit);
  95         table->item[table->nr].used = 0;
  96         table->nr++;
  97 }
  98
  99 static int handle_line(char *line, struct merge_parents *merge_parents)
 100 {
 101         int i, len = strlen(line);
 102         struct origin_data *origin_data;
 103         char *src;
 104         const char *origin;
 105         struct src_data *src_data;
 106         struct string_list_item *item;
 107         int pulling_head = 0;
 108         unsigned char sha1[20];
 109
 110         if (len < 43 || line[40] != '\t')
 111                 return 1;
 112
 113         if (starts_with(line + 41, "not-for-merge"))
 114                 return 0;
 115
 116         if (line[41] != '\t')
 117                 return 2;
 118
 119         i = get_sha1_hex(line, sha1);
 120         if (i)
 121                 return 3;
 122
 123         if (!find_merge_parent(merge_parents, sha1, NULL))
 124                 return 0; /* subsumed by other parents */
 125
 126         origin_data = xcalloc(1, sizeof(struct origin_data));
 127         hashcpy(origin_data->sha1, sha1);
 128
 129         if (line[len - 1] == '\n')
 130                 line[len - 1] = 0;
 131         line += 42;
 132
 133         /*
 134          * At this point, line points at the beginning of comment e.g.
 135          * "branch 'frotz' of git://that/repository.git".
 136          * Find the repository name and point it with src.
 137          */
 138         src = strstr(line, " of ");
 139         if (src) {
 140                 *src = 0;
 141                 src += 4;
 142                 pulling_head = 0;
 143         } else {
 144                 src = line;
 145                 pulling_head = 1;
 146         }
 147
 148         item = unsorted_string_list_lookup(&srcs, src);
 149         if (!item) {
 150                 item = string_list_append(&srcs, src);
 151                 item->util = xcalloc(1, sizeof(struct src_data));
 152                 init_src_data(item->util);
 153         }
 154         src_data = item->util;
 155
 156         if (pulling_head) {
 157                 origin = src;
 158                 src_data->head_status |= 1;
 159         } else if (starts_with(line, "branch ")) {
 160                 origin_data->is_local_branch = 1;
 161                 origin = line + 7;
 162                 string_list_append(&src_data->branch, origin);
 163                 src_data->head_status |= 2;
 164         } else if (starts_with(line, "tag ")) {
 165                 origin = line;
 166                 string_list_append(&src_data->tag, origin + 4);
 167                 src_data->head_status |= 2;
 168         } else if (skip_prefix(line, "remote-tracking branch ", &origin)) {
 169                 string_list_append(&src_data->r_branch, origin);
 170                 src_data->head_status |= 2;
 171         } else {
 172                 origin = src;
 173                 string_list_append(&src_data->generic, line);
 174                 src_data->head_status |= 2;
 175         }
 176
 177         if (!strcmp(".", src) || !strcmp(src, origin)) {
 178                 int len = strlen(origin);
 179                 if (origin[0] == '\'' && origin[len - 1] == '\'')
 180                         origin = xmemdupz(origin + 1, len - 2);
 181         } else
 182                 origin = xstrfmt("%s of %s", origin, src);
 183         if (strcmp(".", src))
 184                 origin_data->is_local_branch = 0;
 185         string_list_append(&origins, origin)->util = origin_data;
 186         return 0;
 187 }
 188
 189 static void print_joined(const char *singular, const char *plural,
 190                 struct string_list *list, struct strbuf *out)
 191 {
 192         if (list->nr == 0)
 193                 return;
 194         if (list->nr == 1) {
 195                 strbuf_addf(out, "%s%s", singular, list->items[0].string);
 196         } else {
 197                 int i;
 198                 strbuf_addstr(out, plural);
 199                 for (i = 0; i < list->nr - 1; i++)
 200                         strbuf_addf(out, "%s%s", i > 0 ? ", " : "",
 201                                     list->items[i].string);
 202                 strbuf_addf(out, " and %s", list->items[list->nr - 1].string);
 203         }
 204 }
 205
 206 static void add_branch_desc(struct strbuf *out, const char *name)
 207 {
 208         struct strbuf desc = STRBUF_INIT;
 209
 210         if (!read_branch_desc(&desc, name)) {
 211                 const char *bp = desc.buf;
 212                 while (*bp) {
 213                         const char *ep = strchrnul(bp, '\n');
 214                         if (*ep)
 215                                 ep++;
 216                         strbuf_addf(out, "  : %.*s", (int)(ep - bp), bp);
 217                         bp = ep;
 218                 }
 219                 strbuf_complete_line(out);
 220         }
 221         strbuf_release(&desc);
 222 }
 223
 224 #define util_as_integral(elem) ((intptr_t)((elem)->util))
 225
 226 static void record_person(int which, struct string_list *people,
 227                           struct commit *commit)
 228 {
 229         const char *buffer;
 230         char *name_buf, *name, *name_end;
 231         struct string_list_item *elem;
 232         const char *field;
 233
 234         field = (which == 'a') ? "\nauthor " : "\ncommitter ";
 235         buffer = get_commit_buffer(commit, NULL);
 236         name = strstr(buffer, field);
 237         if (!name)
 238                 return;
 239         name += strlen(field);
 240         name_end = strchrnul(name, '<');
 241         if (*name_end)
 242                 name_end--;
 243         while (isspace(*name_end) && name <= name_end)
 244                 name_end--;
 245         if (name_end < name)
 246                 return;
 247         name_buf = xmemdupz(name, name_end - name + 1);
 248         unuse_commit_buffer(commit, buffer);
 249
 250         elem = string_list_lookup(people, name_buf);
 251         if (!elem) {
 252                 elem = string_list_insert(people, name_buf);
 253                 elem->util = (void *)0;
 254         }
 255         elem->util = (void*)(util_as_integral(elem) + 1);
 256         free(name_buf);
 257 }
 258
 259 static int cmp_string_list_util_as_integral(const void *a_, const void *b_)
 260 {
 261         const struct string_list_item *a = a_, *b = b_;
 262         return util_as_integral(b) - util_as_integral(a);
 263 }
 264
 265 static void add_people_count(struct strbuf *out, struct string_list *people)
 266 {
 267         if (people->nr == 1)
 268                 strbuf_addf(out, "%s", people->items[0].string);
 269         else if (people->nr == 2)
 270                 strbuf_addf(out, "%s (%d) and %s (%d)",
 271                             people->items[0].string,
 272                             (int)util_as_integral(&people->items[0]),
 273                             people->items[1].string,
 274                             (int)util_as_integral(&people->items[1]));
 275         else if (people->nr)
 276                 strbuf_addf(out, "%s (%d) and others",
 277                             people->items[0].string,
 278                             (int)util_as_integral(&people->items[0]));
 279 }
 280
 281 static void credit_people(struct strbuf *out,
 282                           struct string_list *them,
 283                           int kind)
 284 {
 285         const char *label;
 286         const char *me;
 287
 288         if (kind == 'a') {
 289                 label = "By";
 290                 me = git_author_info(IDENT_NO_DATE);
 291         } else {
 292                 label = "Via";
 293                 me = git_committer_info(IDENT_NO_DATE);
 294         }
 295
 296         if (!them->nr ||
 297             (them->nr == 1 &&
 298              me &&
 299              skip_prefix(me, them->items->string, &me) &&
 300              starts_with(me, " <")))
 301                 return;
 302         strbuf_addf(out, "\n%c %s ", comment_line_char, label);
 303         add_people_count(out, them);
 304 }
 305
 306 static void add_people_info(struct strbuf *out,
 307                             struct string_list *authors,
 308                             struct string_list *committers)
 309 {
 310         if (authors->nr)
 311                 qsort(authors->items,
 312                       authors->nr, sizeof(authors->items[0]),
 313                       cmp_string_list_util_as_integral);
 314         if (committers->nr)
 315                 qsort(committers->items,
 316                       committers->nr, sizeof(committers->items[0]),
 317                       cmp_string_list_util_as_integral);
 318
 319         credit_people(out, authors, 'a');
 320         credit_people(out, committers, 'c');
 321 }
 322
 323 static void shortlog(const char *name,
 324                      struct origin_data *origin_data,
 325                      struct commit *head,
 326                      struct rev_info *rev,
 327                      struct fmt_merge_msg_opts *opts,
 328                      struct strbuf *out)
 329 {
 330         int i, count = 0;
 331         struct commit *commit;
 332         struct object *branch;
 333         struct string_list subjects = STRING_LIST_INIT_DUP;
 334         struct string_list authors = STRING_LIST_INIT_DUP;
 335         struct string_list committers = STRING_LIST_INIT_DUP;
 336         int flags = UNINTERESTING | TREESAME | SEEN | SHOWN | ADDED;
 337         struct strbuf sb = STRBUF_INIT;
 338         const unsigned char *sha1 = origin_data->sha1;
 339         int limit = opts->shortlog_len;
 340
 341         branch = deref_tag(parse_object(sha1), sha1_to_hex(sha1), 40);
 342         if (!branch || branch->type != OBJ_COMMIT)
 343                 return;
 344
 345         setup_revisions(0, NULL, rev, NULL);
 346         add_pending_object(rev, branch, name);
 347         add_pending_object(rev, &head->object, "^HEAD");
 348         head->object.flags |= UNINTERESTING;
 349         if (prepare_revision_walk(rev))
 350                 die("revision walk setup failed");
 351         while ((commit = get_revision(rev)) != NULL) {
 352                 struct pretty_print_context ctx = {0};
 353
 354                 if (commit->parents && commit->parents->next) {
 355                         /* do not list a merge but count committer */
 356                         if (opts->credit_people)
 357                                 record_person('c', &committers, commit);
 358                         continue;
 359                 }
 360                 if (!count && opts->credit_people)
 361                         /* the 'tip' committer */
 362                         record_person('c', &committers, commit);
 363                 if (opts->credit_people)
 364                         record_person('a', &authors, commit);
 365                 count++;
 366                 if (subjects.nr > limit)
 367                         continue;
 368
 369                 format_commit_message(commit, "%s", &sb, &ctx);
 370                 strbuf_ltrim(&sb);
 371
 372                 if (!sb.len)
 373                         string_list_append(&subjects,
 374                                            sha1_to_hex(commit->object.sha1));
 375                 else
 376                         string_list_append(&subjects, strbuf_detach(&sb, NULL));
 377         }
 378
 379         if (opts->credit_people)
 380                 add_people_info(out, &authors, &committers);
 381         if (count > limit)
 382                 strbuf_addf(out, "\n* %s: (%d commits)\n", name, count);
 383         else
 384                 strbuf_addf(out, "\n* %s:\n", name);
 385
 386         if (origin_data->is_local_branch && use_branch_desc)
 387                 add_branch_desc(out, name);
 388
 389         for (i = 0; i < subjects.nr; i++)
 390                 if (i >= limit)
 391                         strbuf_addf(out, "  ...\n");
 392                 else
 393                         strbuf_addf(out, "  %s\n", subjects.items[i].string);
 394
 395         clear_commit_marks((struct commit *)branch, flags);
 396         clear_commit_marks(head, flags);
 397         free_commit_list(rev->commits);
 398         rev->commits = NULL;
 399         rev->pending.nr = 0;
 400
 401         string_list_clear(&authors, 0);
 402         string_list_clear(&committers, 0);
 403         string_list_clear(&subjects, 0);
 404 }
 405
 406 static void fmt_merge_msg_title(struct strbuf *out,
 407         const char *current_branch) {
 408         int i = 0;
 409         char *sep = "";
 410
 411         strbuf_addstr(out, "Merge ");
 412         for (i = 0; i < srcs.nr; i++) {
 413                 struct src_data *src_data = srcs.items[i].util;
 414                 const char *subsep = "";
 415
 416                 strbuf_addstr(out, sep);
 417                 sep = "; ";
 418
 419                 if (src_data->head_status == 1) {
 420                         strbuf_addstr(out, srcs.items[i].string);
 421                         continue;
 422                 }
 423                 if (src_data->head_status == 3) {
 424                         subsep = ", ";
 425                         strbuf_addstr(out, "HEAD");
 426                 }
 427                 if (src_data->branch.nr) {
 428                         strbuf_addstr(out, subsep);
 429                         subsep = ", ";
 430                         print_joined("branch ", "branches ", &src_data->branch,
 431                                         out);
 432                 }
 433                 if (src_data->r_branch.nr) {
 434                         strbuf_addstr(out, subsep);
 435                         subsep = ", ";
 436                         print_joined("remote-tracking branch ", "remote-tracking branches ",
 437                                         &src_data->r_branch, out);
 438                 }
 439                 if (src_data->tag.nr) {
 440                         strbuf_addstr(out, subsep);
 441                         subsep = ", ";
 442                         print_joined("tag ", "tags ", &src_data->tag, out);
 443                 }
 444                 if (src_data->generic.nr) {
 445                         strbuf_addstr(out, subsep);
 446                         print_joined("commit ", "commits ", &src_data->generic,
 447                                         out);
 448                 }
 449                 if (strcmp(".", srcs.items[i].string))
 450                         strbuf_addf(out, " of %s", srcs.items[i].string);
 451         }
 452
 453         if (!strcmp("master", current_branch))
 454                 strbuf_addch(out, '\n');
 455         else
 456                 strbuf_addf(out, " into %s\n", current_branch);
 457 }
 458
 459 static void fmt_tag_signature(struct strbuf *tagbuf,
 460                               struct strbuf *sig,
 461                               const char *buf,
 462                               unsigned long len)
 463 {
 464         const char *tag_body = strstr(buf, "\n\n");
 465         if (tag_body) {
 466                 tag_body += 2;
 467                 strbuf_add(tagbuf, tag_body, buf + len - tag_body);
 468         }
 469         strbuf_complete_line(tagbuf);
 470         if (sig->len) {
 471                 strbuf_addch(tagbuf, '\n');
 472                 strbuf_add_commented_lines(tagbuf, sig->buf, sig->len);
 473         }
 474 }
 475
 476 static void fmt_merge_msg_sigs(struct strbuf *out)
 477 {
 478         int i, tag_number = 0, first_tag = 0;
 479         struct strbuf tagbuf = STRBUF_INIT;
 480
 481         for (i = 0; i < origins.nr; i++) {
 482                 unsigned char *sha1 = origins.items[i].util;
 483                 enum object_type type;
 484                 unsigned long size, len;
 485                 char *buf = read_sha1_file(sha1, &type, &size);
 486                 struct strbuf sig = STRBUF_INIT;
 487
 488                 if (!buf || type != OBJ_TAG)
 489                         goto next;
 490                 len = parse_signature(buf, size);
 491
 492                 if (size == len)
 493                         ; /* merely annotated */
 494                 else if (verify_signed_buffer(buf, len, buf + len, size - len, &sig, NULL)) {
 495                         if (!sig.len)
 496                                 strbuf_addstr(&sig, "gpg verification failed.\n");
 497                 }
 498
 499                 if (!tag_number++) {
 500                         fmt_tag_signature(&tagbuf, &sig, buf, len);
 501                         first_tag = i;
 502                 } else {
 503                         if (tag_number == 2) {
 504                                 struct strbuf tagline = STRBUF_INIT;
 505                                 strbuf_addch(&tagline, '\n');
 506                                 strbuf_add_commented_lines(&tagline,
 507                                                 origins.items[first_tag].string,
 508                                                 strlen(origins.items[first_tag].string));
 509                                 strbuf_insert(&tagbuf, 0, tagline.buf,
 510                                               tagline.len);
 511                                 strbuf_release(&tagline);
 512                         }
 513                         strbuf_addch(&tagbuf, '\n');
 514                         strbuf_add_commented_lines(&tagbuf,
 515                                         origins.items[i].string,
 516                                         strlen(origins.items[i].string));
 517                         fmt_tag_signature(&tagbuf, &sig, buf, len);
 518                 }
 519                 strbuf_release(&sig);
 520         next:
 521                 free(buf);
 522         }
 523         if (tagbuf.len) {
 524                 strbuf_addch(out, '\n');
 525                 strbuf_addbuf(out, &tagbuf);
 526         }
 527         strbuf_release(&tagbuf);
 528 }
 529
 530 static void find_merge_parents(struct merge_parents *result,
 531                                struct strbuf *in, unsigned char *head)
 532 {
 533         struct commit_list *parents, *next;
 534         struct commit *head_commit;
 535         int pos = 0, i, j;
 536
 537         parents = NULL;
 538         while (pos < in->len) {
 539                 int len;
 540                 char *p = in->buf + pos;
 541                 char *newline = strchr(p, '\n');
 542                 unsigned char sha1[20];
 543                 struct commit *parent;
 544                 struct object *obj;
 545
 546                 len = newline ? newline - p : strlen(p);
 547                 pos += len + !!newline;
 548
 549                 if (len < 43 ||
 550                     get_sha1_hex(p, sha1) ||
 551                     p[40] != '\t' ||
 552                     p[41] != '\t')
 553                         continue; /* skip not-for-merge */
 554                 /*
 555                  * Do not use get_merge_parent() here; we do not have
 556                  * "name" here and we do not want to contaminate its
 557                  * util field yet.
 558                  */
 559                 obj = parse_object(sha1);
 560                 parent = (struct commit *)peel_to_type(NULL, 0, obj, OBJ_COMMIT);
 561                 if (!parent)
 562                         continue;
 563                 commit_list_insert(parent, &parents);
 564                 add_merge_parent(result, obj->sha1, parent->object.sha1);
 565         }
 566         head_commit = lookup_commit(head);
 567         if (head_commit)
 568                 commit_list_insert(head_commit, &parents);
 569         parents = reduce_heads(parents);
 570
 571         while (parents) {
 572                 for (i = 0; i < result->nr; i++)
 573                         if (!hashcmp(result->item[i].commit,
 574                                      parents->item->object.sha1))
 575                                 result->item[i].used = 1;
 576                 next = parents->next;
 577                 free(parents);
 578                 parents = next;
 579         }
 580
 581         for (i = j = 0; i < result->nr; i++) {
 582                 if (result->item[i].used) {
 583                         if (i != j)
 584                                 result->item[j] = result->item[i];
 585                         j++;
 586                 }
 587         }
 588         result->nr = j;
 589 }
 590
 591 int fmt_merge_msg(struct strbuf *in, struct strbuf *out,
 592                   struct fmt_merge_msg_opts *opts)
 593 {
 594         int i = 0, pos = 0;
 595         unsigned char head_sha1[20];
 596         const char *current_branch;
 597         void *current_branch_to_free;
 598         struct merge_parents merge_parents;
 599
 600         memset(&merge_parents, 0, sizeof(merge_parents));
 601
 602         /* get current branch */
 603         current_branch = current_branch_to_free =
 604                 resolve_refdup("HEAD", RESOLVE_REF_READING, head_sha1, NULL);
 605         if (!current_branch)
 606                 die("No current branch");
 607         if (starts_with(current_branch, "refs/heads/"))
 608                 current_branch += 11;
 609
 610         find_merge_parents(&merge_parents, in, head_sha1);
 611
 612         /* get a line */
 613         while (pos < in->len) {
 614                 int len;
 615                 char *newline, *p = in->buf + pos;
 616
 617                 newline = strchr(p, '\n');
 618                 len = newline ? newline - p : strlen(p);
 619                 pos += len + !!newline;
 620                 i++;
 621                 p[len] = 0;
 622                 if (handle_line(p, &merge_parents))
 623                         die ("Error in line %d: %.*s", i, len, p);
 624         }
 625
 626         if (opts->add_title && srcs.nr)
 627                 fmt_merge_msg_title(out, current_branch);
 628
 629         if (origins.nr)
 630                 fmt_merge_msg_sigs(out);
 631
 632         if (opts->shortlog_len) {
 633                 struct commit *head;
 634                 struct rev_info rev;
 635
 636                 head = lookup_commit_or_die(head_sha1, "HEAD");
 637                 init_revisions(&rev, NULL);
 638                 rev.commit_format = CMIT_FMT_ONELINE;
 639                 rev.ignore_merges = 1;
 640                 rev.limited = 1;
 641
 642                 strbuf_complete_line(out);
 643
 644                 for (i = 0; i < origins.nr; i++)
 645                         shortlog(origins.items[i].string,
 646                                  origins.items[i].util,
 647                                  head, &rev, opts, out);
 648         }
 649
 650         strbuf_complete_line(out);
 651         free(current_branch_to_free);
 652         free(merge_parents.item);
 653         return 0;
 654 }
 655
 656 int cmd_fmt_merge_msg(int argc, const char **argv, const char *prefix)
 657 {
 658         const char *inpath = NULL;
 659         const char *message = NULL;
 660         int shortlog_len = -1;
 661         struct option options[] = {
 662                 { OPTION_INTEGER, 0, "log", &shortlog_len, N_("n"),
 663                   N_("populate log with at most <n> entries from shortlog"),
 664                   PARSE_OPT_OPTARG, NULL, DEFAULT_MERGE_LOG_LEN },
 665                 { OPTION_INTEGER, 0, "summary", &shortlog_len, N_("n"),
 666                   N_("alias for --log (deprecated)"),
 667                   PARSE_OPT_OPTARG | PARSE_OPT_HIDDEN, NULL,
 668                   DEFAULT_MERGE_LOG_LEN },
 669                 OPT_STRING('m', "message", &message, N_("text"),
 670                         N_("use <text> as start of message")),
 671                 OPT_FILENAME('F', "file", &inpath, N_("file to read from")),
 672                 OPT_END()
 673         };
 674
 675         FILE *in = stdin;
 676         struct strbuf input = STRBUF_INIT, output = STRBUF_INIT;
 677         int ret;
 678         struct fmt_merge_msg_opts opts;
 679
 680         git_config(fmt_merge_msg_config, NULL);
 681         argc = parse_options(argc, argv, prefix, options, fmt_merge_msg_usage,
 682                              0);
 683         if (argc > 0)
 684                 usage_with_options(fmt_merge_msg_usage, options);
 685         if (shortlog_len < 0)
 686                 shortlog_len = (merge_log_config > 0) ? merge_log_config : 0;
 687
 688         if (inpath && strcmp(inpath, "-")) {
 689                 in = fopen(inpath, "r");
 690                 if (!in)
 691                         die_errno("cannot open '%s'", inpath);
 692         }
 693
 694         if (strbuf_read(&input, fileno(in), 0) < 0)
 695                 die_errno("could not read input file");
 696
 697         if (message)
 698                 strbuf_addstr(&output, message);
 699
 700         memset(&opts, 0, sizeof(opts));
 701         opts.add_title = !message;
 702         opts.credit_people = 1;
 703         opts.shortlog_len = shortlog_len;
 704
 705         ret = fmt_merge_msg(&input, &output, &opts);
 706         if (ret)
 707                 return ret;
 708         write_in_full(STDOUT_FILENO, output.buf, output.len);
 709         return 0;
 710 }