Andrew's git / gitweb.git / builtin/fmt-merge-msg.c
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builtin / fmt-merge-msg.con commit Merge branch 'jc/unexport-git-pager-in-use-in-pager' into maint (342c14d)
   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
  12static 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
  17static int use_branch_desc;
  18
  19int 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 */
  37struct src_data {
  38        struct string_list branch, tag, r_branch, generic;
  39        int head_status;
  40};
  41
  42struct origin_data {
  43        unsigned char sha1[20];
  44        unsigned is_local_branch:1;
  45};
  46
  47static 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
  55static struct string_list srcs = STRING_LIST_INIT_DUP;
  56static struct string_list origins = STRING_LIST_INIT_DUP;
  57
  58struct 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 */
  71static 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
  86static 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
  99static 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
 189static 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
 206static 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
 226static void record_person_from_buf(int which, struct string_list *people,
 227                                   const char *buffer)
 228{
 229        char *name_buf, *name, *name_end;
 230        struct string_list_item *elem;
 231        const char *field;
 232
 233        field = (which == 'a') ? "\nauthor " : "\ncommitter ";
 234        name = strstr(buffer, field);
 235        if (!name)
 236                return;
 237        name += strlen(field);
 238        name_end = strchrnul(name, '<');
 239        if (*name_end)
 240                name_end--;
 241        while (isspace(*name_end) && name <= name_end)
 242                name_end--;
 243        if (name_end < name)
 244                return;
 245        name_buf = xmemdupz(name, name_end - name + 1);
 246
 247        elem = string_list_lookup(people, name_buf);
 248        if (!elem) {
 249                elem = string_list_insert(people, name_buf);
 250                elem->util = (void *)0;
 251        }
 252        elem->util = (void*)(util_as_integral(elem) + 1);
 253        free(name_buf);
 254}
 255
 256
 257static void record_person(int which, struct string_list *people,
 258                          struct commit *commit)
 259{
 260        const char *buffer = get_commit_buffer(commit, NULL);
 261        record_person_from_buf(which, people, buffer);
 262        unuse_commit_buffer(commit, buffer);
 263}
 264
 265static int cmp_string_list_util_as_integral(const void *a_, const void *b_)
 266{
 267        const struct string_list_item *a = a_, *b = b_;
 268        return util_as_integral(b) - util_as_integral(a);
 269}
 270
 271static void add_people_count(struct strbuf *out, struct string_list *people)
 272{
 273        if (people->nr == 1)
 274                strbuf_addf(out, "%s", people->items[0].string);
 275        else if (people->nr == 2)
 276                strbuf_addf(out, "%s (%d) and %s (%d)",
 277                            people->items[0].string,
 278                            (int)util_as_integral(&people->items[0]),
 279                            people->items[1].string,
 280                            (int)util_as_integral(&people->items[1]));
 281        else if (people->nr)
 282                strbuf_addf(out, "%s (%d) and others",
 283                            people->items[0].string,
 284                            (int)util_as_integral(&people->items[0]));
 285}
 286
 287static void credit_people(struct strbuf *out,
 288                          struct string_list *them,
 289                          int kind)
 290{
 291        const char *label;
 292        const char *me;
 293
 294        if (kind == 'a') {
 295                label = "By";
 296                me = git_author_info(IDENT_NO_DATE);
 297        } else {
 298                label = "Via";
 299                me = git_committer_info(IDENT_NO_DATE);
 300        }
 301
 302        if (!them->nr ||
 303            (them->nr == 1 &&
 304             me &&
 305             skip_prefix(me, them->items->string, &me) &&
 306             starts_with(me, " <")))
 307                return;
 308        strbuf_addf(out, "\n%c %s ", comment_line_char, label);
 309        add_people_count(out, them);
 310}
 311
 312static void add_people_info(struct strbuf *out,
 313                            struct string_list *authors,
 314                            struct string_list *committers)
 315{
 316        if (authors->nr)
 317                qsort(authors->items,
 318                      authors->nr, sizeof(authors->items[0]),
 319                      cmp_string_list_util_as_integral);
 320        if (committers->nr)
 321                qsort(committers->items,
 322                      committers->nr, sizeof(committers->items[0]),
 323                      cmp_string_list_util_as_integral);
 324
 325        credit_people(out, authors, 'a');
 326        credit_people(out, committers, 'c');
 327}
 328
 329static void shortlog(const char *name,
 330                     struct origin_data *origin_data,
 331                     struct commit *head,
 332                     struct rev_info *rev,
 333                     struct fmt_merge_msg_opts *opts,
 334                     struct strbuf *out)
 335{
 336        int i, count = 0;
 337        struct commit *commit;
 338        struct object *branch;
 339        struct string_list subjects = STRING_LIST_INIT_DUP;
 340        struct string_list authors = STRING_LIST_INIT_DUP;
 341        struct string_list committers = STRING_LIST_INIT_DUP;
 342        int flags = UNINTERESTING | TREESAME | SEEN | SHOWN | ADDED;
 343        struct strbuf sb = STRBUF_INIT;
 344        const unsigned char *sha1 = origin_data->sha1;
 345        int limit = opts->shortlog_len;
 346
 347        branch = deref_tag(parse_object(sha1), sha1_to_hex(sha1), 40);
 348        if (!branch || branch->type != OBJ_COMMIT)
 349                return;
 350
 351        setup_revisions(0, NULL, rev, NULL);
 352        add_pending_object(rev, branch, name);
 353        add_pending_object(rev, &head->object, "^HEAD");
 354        head->object.flags |= UNINTERESTING;
 355        if (prepare_revision_walk(rev))
 356                die("revision walk setup failed");
 357        while ((commit = get_revision(rev)) != NULL) {
 358                struct pretty_print_context ctx = {0};
 359
 360                if (commit->parents && commit->parents->next) {
 361                        /* do not list a merge but count committer */
 362                        if (opts->credit_people)
 363                                record_person('c', &committers, commit);
 364                        continue;
 365                }
 366                if (!count && opts->credit_people)
 367                        /* the 'tip' committer */
 368                        record_person('c', &committers, commit);
 369                if (opts->credit_people)
 370                        record_person('a', &authors, commit);
 371                count++;
 372                if (subjects.nr > limit)
 373                        continue;
 374
 375                format_commit_message(commit, "%s", &sb, &ctx);
 376                strbuf_ltrim(&sb);
 377
 378                if (!sb.len)
 379                        string_list_append(&subjects,
 380                                           sha1_to_hex(commit->object.sha1));
 381                else
 382                        string_list_append(&subjects, strbuf_detach(&sb, NULL));
 383        }
 384
 385        if (opts->credit_people)
 386                add_people_info(out, &authors, &committers);
 387        if (count > limit)
 388                strbuf_addf(out, "\n* %s: (%d commits)\n", name, count);
 389        else
 390                strbuf_addf(out, "\n* %s:\n", name);
 391
 392        if (origin_data->is_local_branch && use_branch_desc)
 393                add_branch_desc(out, name);
 394
 395        for (i = 0; i < subjects.nr; i++)
 396                if (i >= limit)
 397                        strbuf_addf(out, "  ...\n");
 398                else
 399                        strbuf_addf(out, "  %s\n", subjects.items[i].string);
 400
 401        clear_commit_marks((struct commit *)branch, flags);
 402        clear_commit_marks(head, flags);
 403        free_commit_list(rev->commits);
 404        rev->commits = NULL;
 405        rev->pending.nr = 0;
 406
 407        string_list_clear(&authors, 0);
 408        string_list_clear(&committers, 0);
 409        string_list_clear(&subjects, 0);
 410}
 411
 412static void fmt_merge_msg_title(struct strbuf *out,
 413        const char *current_branch) {
 414        int i = 0;
 415        char *sep = "";
 416
 417        strbuf_addstr(out, "Merge ");
 418        for (i = 0; i < srcs.nr; i++) {
 419                struct src_data *src_data = srcs.items[i].util;
 420                const char *subsep = "";
 421
 422                strbuf_addstr(out, sep);
 423                sep = "; ";
 424
 425                if (src_data->head_status == 1) {
 426                        strbuf_addstr(out, srcs.items[i].string);
 427                        continue;
 428                }
 429                if (src_data->head_status == 3) {
 430                        subsep = ", ";
 431                        strbuf_addstr(out, "HEAD");
 432                }
 433                if (src_data->branch.nr) {
 434                        strbuf_addstr(out, subsep);
 435                        subsep = ", ";
 436                        print_joined("branch ", "branches ", &src_data->branch,
 437                                        out);
 438                }
 439                if (src_data->r_branch.nr) {
 440                        strbuf_addstr(out, subsep);
 441                        subsep = ", ";
 442                        print_joined("remote-tracking branch ", "remote-tracking branches ",
 443                                        &src_data->r_branch, out);
 444                }
 445                if (src_data->tag.nr) {
 446                        strbuf_addstr(out, subsep);
 447                        subsep = ", ";
 448                        print_joined("tag ", "tags ", &src_data->tag, out);
 449                }
 450                if (src_data->generic.nr) {
 451                        strbuf_addstr(out, subsep);
 452                        print_joined("commit ", "commits ", &src_data->generic,
 453                                        out);
 454                }
 455                if (strcmp(".", srcs.items[i].string))
 456                        strbuf_addf(out, " of %s", srcs.items[i].string);
 457        }
 458
 459        if (!strcmp("master", current_branch))
 460                strbuf_addch(out, '\n');
 461        else
 462                strbuf_addf(out, " into %s\n", current_branch);
 463}
 464
 465static void fmt_tag_signature(struct strbuf *tagbuf,
 466                              struct strbuf *sig,
 467                              const char *buf,
 468                              unsigned long len)
 469{
 470        const char *tag_body = strstr(buf, "\n\n");
 471        if (tag_body) {
 472                tag_body += 2;
 473                strbuf_add(tagbuf, tag_body, buf + len - tag_body);
 474        }
 475        strbuf_complete_line(tagbuf);
 476        if (sig->len) {
 477                strbuf_addch(tagbuf, '\n');
 478                strbuf_add_commented_lines(tagbuf, sig->buf, sig->len);
 479        }
 480}
 481
 482static void fmt_merge_msg_sigs(struct strbuf *out)
 483{
 484        int i, tag_number = 0, first_tag = 0;
 485        struct strbuf tagbuf = STRBUF_INIT;
 486
 487        for (i = 0; i < origins.nr; i++) {
 488                unsigned char *sha1 = origins.items[i].util;
 489                enum object_type type;
 490                unsigned long size, len;
 491                char *buf = read_sha1_file(sha1, &type, &size);
 492                struct strbuf sig = STRBUF_INIT;
 493
 494                if (!buf || type != OBJ_TAG)
 495                        goto next;
 496                len = parse_signature(buf, size);
 497
 498                if (size == len)
 499                        ; /* merely annotated */
 500                else if (verify_signed_buffer(buf, len, buf + len, size - len, &sig, NULL)) {
 501                        if (!sig.len)
 502                                strbuf_addstr(&sig, "gpg verification failed.\n");
 503                }
 504
 505                if (!tag_number++) {
 506                        fmt_tag_signature(&tagbuf, &sig, buf, len);
 507                        first_tag = i;
 508                } else {
 509                        if (tag_number == 2) {
 510                                struct strbuf tagline = STRBUF_INIT;
 511                                strbuf_addch(&tagline, '\n');
 512                                strbuf_add_commented_lines(&tagline,
 513                                                origins.items[first_tag].string,
 514                                                strlen(origins.items[first_tag].string));
 515                                strbuf_insert(&tagbuf, 0, tagline.buf,
 516                                              tagline.len);
 517                                strbuf_release(&tagline);
 518                        }
 519                        strbuf_addch(&tagbuf, '\n');
 520                        strbuf_add_commented_lines(&tagbuf,
 521                                        origins.items[i].string,
 522                                        strlen(origins.items[i].string));
 523                        fmt_tag_signature(&tagbuf, &sig, buf, len);
 524                }
 525                strbuf_release(&sig);
 526        next:
 527                free(buf);
 528        }
 529        if (tagbuf.len) {
 530                strbuf_addch(out, '\n');
 531                strbuf_addbuf(out, &tagbuf);
 532        }
 533        strbuf_release(&tagbuf);
 534}
 535
 536static void find_merge_parents(struct merge_parents *result,
 537                               struct strbuf *in, unsigned char *head)
 538{
 539        struct commit_list *parents, *next;
 540        struct commit *head_commit;
 541        int pos = 0, i, j;
 542
 543        parents = NULL;
 544        while (pos < in->len) {
 545                int len;
 546                char *p = in->buf + pos;
 547                char *newline = strchr(p, '\n');
 548                unsigned char sha1[20];
 549                struct commit *parent;
 550                struct object *obj;
 551
 552                len = newline ? newline - p : strlen(p);
 553                pos += len + !!newline;
 554
 555                if (len < 43 ||
 556                    get_sha1_hex(p, sha1) ||
 557                    p[40] != '\t' ||
 558                    p[41] != '\t')
 559                        continue; /* skip not-for-merge */
 560                /*
 561                 * Do not use get_merge_parent() here; we do not have
 562                 * "name" here and we do not want to contaminate its
 563                 * util field yet.
 564                 */
 565                obj = parse_object(sha1);
 566                parent = (struct commit *)peel_to_type(NULL, 0, obj, OBJ_COMMIT);
 567                if (!parent)
 568                        continue;
 569                commit_list_insert(parent, &parents);
 570                add_merge_parent(result, obj->sha1, parent->object.sha1);
 571        }
 572        head_commit = lookup_commit(head);
 573        if (head_commit)
 574                commit_list_insert(head_commit, &parents);
 575        parents = reduce_heads(parents);
 576
 577        while (parents) {
 578                for (i = 0; i < result->nr; i++)
 579                        if (!hashcmp(result->item[i].commit,
 580                                     parents->item->object.sha1))
 581                                result->item[i].used = 1;
 582                next = parents->next;
 583                free(parents);
 584                parents = next;
 585        }
 586
 587        for (i = j = 0; i < result->nr; i++) {
 588                if (result->item[i].used) {
 589                        if (i != j)
 590                                result->item[j] = result->item[i];
 591                        j++;
 592                }
 593        }
 594        result->nr = j;
 595}
 596
 597int fmt_merge_msg(struct strbuf *in, struct strbuf *out,
 598                  struct fmt_merge_msg_opts *opts)
 599{
 600        int i = 0, pos = 0;
 601        unsigned char head_sha1[20];
 602        const char *current_branch;
 603        void *current_branch_to_free;
 604        struct merge_parents merge_parents;
 605
 606        memset(&merge_parents, 0, sizeof(merge_parents));
 607
 608        /* get current branch */
 609        current_branch = current_branch_to_free =
 610                resolve_refdup("HEAD", RESOLVE_REF_READING, head_sha1, NULL);
 611        if (!current_branch)
 612                die("No current branch");
 613        if (starts_with(current_branch, "refs/heads/"))
 614                current_branch += 11;
 615
 616        find_merge_parents(&merge_parents, in, head_sha1);
 617
 618        /* get a line */
 619        while (pos < in->len) {
 620                int len;
 621                char *newline, *p = in->buf + pos;
 622
 623                newline = strchr(p, '\n');
 624                len = newline ? newline - p : strlen(p);
 625                pos += len + !!newline;
 626                i++;
 627                p[len] = 0;
 628                if (handle_line(p, &merge_parents))
 629                        die ("Error in line %d: %.*s", i, len, p);
 630        }
 631
 632        if (opts->add_title && srcs.nr)
 633                fmt_merge_msg_title(out, current_branch);
 634
 635        if (origins.nr)
 636                fmt_merge_msg_sigs(out);
 637
 638        if (opts->shortlog_len) {
 639                struct commit *head;
 640                struct rev_info rev;
 641
 642                head = lookup_commit_or_die(head_sha1, "HEAD");
 643                init_revisions(&rev, NULL);
 644                rev.commit_format = CMIT_FMT_ONELINE;
 645                rev.ignore_merges = 1;
 646                rev.limited = 1;
 647
 648                strbuf_complete_line(out);
 649
 650                for (i = 0; i < origins.nr; i++)
 651                        shortlog(origins.items[i].string,
 652                                 origins.items[i].util,
 653                                 head, &rev, opts, out);
 654        }
 655
 656        strbuf_complete_line(out);
 657        free(current_branch_to_free);
 658        free(merge_parents.item);
 659        return 0;
 660}
 661
 662int cmd_fmt_merge_msg(int argc, const char **argv, const char *prefix)
 663{
 664        const char *inpath = NULL;
 665        const char *message = NULL;
 666        int shortlog_len = -1;
 667        struct option options[] = {
 668                { OPTION_INTEGER, 0, "log", &shortlog_len, N_("n"),
 669                  N_("populate log with at most <n> entries from shortlog"),
 670                  PARSE_OPT_OPTARG, NULL, DEFAULT_MERGE_LOG_LEN },
 671                { OPTION_INTEGER, 0, "summary", &shortlog_len, N_("n"),
 672                  N_("alias for --log (deprecated)"),
 673                  PARSE_OPT_OPTARG | PARSE_OPT_HIDDEN, NULL,
 674                  DEFAULT_MERGE_LOG_LEN },
 675                OPT_STRING('m', "message", &message, N_("text"),
 676                        N_("use <text> as start of message")),
 677                OPT_FILENAME('F', "file", &inpath, N_("file to read from")),
 678                OPT_END()
 679        };
 680
 681        FILE *in = stdin;
 682        struct strbuf input = STRBUF_INIT, output = STRBUF_INIT;
 683        int ret;
 684        struct fmt_merge_msg_opts opts;
 685
 686        git_config(fmt_merge_msg_config, NULL);
 687        argc = parse_options(argc, argv, prefix, options, fmt_merge_msg_usage,
 688                             0);
 689        if (argc > 0)
 690                usage_with_options(fmt_merge_msg_usage, options);
 691        if (shortlog_len < 0)
 692                shortlog_len = (merge_log_config > 0) ? merge_log_config : 0;
 693
 694        if (inpath && strcmp(inpath, "-")) {
 695                in = fopen(inpath, "r");
 696                if (!in)
 697                        die_errno("cannot open '%s'", inpath);
 698        }
 699
 700        if (strbuf_read(&input, fileno(in), 0) < 0)
 701                die_errno("could not read input file");
 702
 703        if (message)
 704                strbuf_addstr(&output, message);
 705
 706        memset(&opts, 0, sizeof(opts));
 707        opts.add_title = !message;
 708        opts.credit_people = 1;
 709        opts.shortlog_len = shortlog_len;
 710
 711        ret = fmt_merge_msg(&input, &output, &opts);
 712        if (ret)
 713                return ret;
 714        write_in_full(STDOUT_FILENO, output.buf, output.len);
 715        return 0;
 716}