Andrew's git / gitweb.git / builtin/fmt-merge-msg.c
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builtin / fmt-merge-msg.con commit Merge branch 'ml/filter-branch-no-op-error' (cb3e97d)
   1#include "builtin.h"
   2#include "cache.h"
   3#include "config.h"
   4#include "refs.h"
   5#include "commit.h"
   6#include "diff.h"
   7#include "revision.h"
   8#include "tag.h"
   9#include "string-list.h"
  10#include "branch.h"
  11#include "fmt-merge-msg.h"
  12#include "gpg-interface.h"
  13
  14static const char * const fmt_merge_msg_usage[] = {
  15        N_("git fmt-merge-msg [-m <message>] [--log[=<n>] | --no-log] [--file <file>]"),
  16        NULL
  17};
  18
  19static int use_branch_desc;
  20
  21int fmt_merge_msg_config(const char *key, const char *value, void *cb)
  22{
  23        if (!strcmp(key, "merge.log") || !strcmp(key, "merge.summary")) {
  24                int is_bool;
  25                merge_log_config = git_config_bool_or_int(key, value, &is_bool);
  26                if (!is_bool && merge_log_config < 0)
  27                        return error("%s: negative length %s", key, value);
  28                if (is_bool && merge_log_config)
  29                        merge_log_config = DEFAULT_MERGE_LOG_LEN;
  30        } else if (!strcmp(key, "merge.branchdesc")) {
  31                use_branch_desc = git_config_bool(key, value);
  32        } else {
  33                return git_default_config(key, value, cb);
  34        }
  35        return 0;
  36}
  37
  38/* merge data per repository where the merged tips came from */
  39struct src_data {
  40        struct string_list branch, tag, r_branch, generic;
  41        int head_status;
  42};
  43
  44struct origin_data {
  45        struct object_id oid;
  46        unsigned is_local_branch:1;
  47};
  48
  49static void init_src_data(struct src_data *data)
  50{
  51        data->branch.strdup_strings = 1;
  52        data->tag.strdup_strings = 1;
  53        data->r_branch.strdup_strings = 1;
  54        data->generic.strdup_strings = 1;
  55}
  56
  57static struct string_list srcs = STRING_LIST_INIT_DUP;
  58static struct string_list origins = STRING_LIST_INIT_DUP;
  59
  60struct merge_parents {
  61        int alloc, nr;
  62        struct merge_parent {
  63                struct object_id given;
  64                struct object_id commit;
  65                unsigned char used;
  66        } *item;
  67};
  68
  69/*
  70 * I know, I know, this is inefficient, but you won't be pulling and merging
  71 * hundreds of heads at a time anyway.
  72 */
  73static struct merge_parent *find_merge_parent(struct merge_parents *table,
  74                                              struct object_id *given,
  75                                              struct object_id *commit)
  76{
  77        int i;
  78        for (i = 0; i < table->nr; i++) {
  79                if (given && oidcmp(&table->item[i].given, given))
  80                        continue;
  81                if (commit && oidcmp(&table->item[i].commit, commit))
  82                        continue;
  83                return &table->item[i];
  84        }
  85        return NULL;
  86}
  87
  88static void add_merge_parent(struct merge_parents *table,
  89                             struct object_id *given,
  90                             struct object_id *commit)
  91{
  92        if (table->nr && find_merge_parent(table, given, commit))
  93                return;
  94        ALLOC_GROW(table->item, table->nr + 1, table->alloc);
  95        oidcpy(&table->item[table->nr].given, given);
  96        oidcpy(&table->item[table->nr].commit, commit);
  97        table->item[table->nr].used = 0;
  98        table->nr++;
  99}
 100
 101static int handle_line(char *line, struct merge_parents *merge_parents)
 102{
 103        int i, len = strlen(line);
 104        struct origin_data *origin_data;
 105        char *src;
 106        const char *origin;
 107        struct src_data *src_data;
 108        struct string_list_item *item;
 109        int pulling_head = 0;
 110        struct object_id oid;
 111
 112        if (len < GIT_SHA1_HEXSZ + 3 || line[GIT_SHA1_HEXSZ] != '\t')
 113                return 1;
 114
 115        if (starts_with(line + GIT_SHA1_HEXSZ + 1, "not-for-merge"))
 116                return 0;
 117
 118        if (line[GIT_SHA1_HEXSZ + 1] != '\t')
 119                return 2;
 120
 121        i = get_oid_hex(line, &oid);
 122        if (i)
 123                return 3;
 124
 125        if (!find_merge_parent(merge_parents, &oid, NULL))
 126                return 0; /* subsumed by other parents */
 127
 128        origin_data = xcalloc(1, sizeof(struct origin_data));
 129        oidcpy(&origin_data->oid, &oid);
 130
 131        if (line[len - 1] == '\n')
 132                line[len - 1] = 0;
 133        line += GIT_SHA1_HEXSZ + 2;
 134
 135        /*
 136         * At this point, line points at the beginning of comment e.g.
 137         * "branch 'frotz' of git://that/repository.git".
 138         * Find the repository name and point it with src.
 139         */
 140        src = strstr(line, " of ");
 141        if (src) {
 142                *src = 0;
 143                src += 4;
 144                pulling_head = 0;
 145        } else {
 146                src = line;
 147                pulling_head = 1;
 148        }
 149
 150        item = unsorted_string_list_lookup(&srcs, src);
 151        if (!item) {
 152                item = string_list_append(&srcs, src);
 153                item->util = xcalloc(1, sizeof(struct src_data));
 154                init_src_data(item->util);
 155        }
 156        src_data = item->util;
 157
 158        if (pulling_head) {
 159                origin = src;
 160                src_data->head_status |= 1;
 161        } else if (starts_with(line, "branch ")) {
 162                origin_data->is_local_branch = 1;
 163                origin = line + 7;
 164                string_list_append(&src_data->branch, origin);
 165                src_data->head_status |= 2;
 166        } else if (starts_with(line, "tag ")) {
 167                origin = line;
 168                string_list_append(&src_data->tag, origin + 4);
 169                src_data->head_status |= 2;
 170        } else if (skip_prefix(line, "remote-tracking branch ", &origin)) {
 171                string_list_append(&src_data->r_branch, origin);
 172                src_data->head_status |= 2;
 173        } else {
 174                origin = src;
 175                string_list_append(&src_data->generic, line);
 176                src_data->head_status |= 2;
 177        }
 178
 179        if (!strcmp(".", src) || !strcmp(src, origin)) {
 180                int len = strlen(origin);
 181                if (origin[0] == '\'' && origin[len - 1] == '\'')
 182                        origin = xmemdupz(origin + 1, len - 2);
 183        } else
 184                origin = xstrfmt("%s of %s", origin, src);
 185        if (strcmp(".", src))
 186                origin_data->is_local_branch = 0;
 187        string_list_append(&origins, origin)->util = origin_data;
 188        return 0;
 189}
 190
 191static void print_joined(const char *singular, const char *plural,
 192                struct string_list *list, struct strbuf *out)
 193{
 194        if (list->nr == 0)
 195                return;
 196        if (list->nr == 1) {
 197                strbuf_addf(out, "%s%s", singular, list->items[0].string);
 198        } else {
 199                int i;
 200                strbuf_addstr(out, plural);
 201                for (i = 0; i < list->nr - 1; i++)
 202                        strbuf_addf(out, "%s%s", i > 0 ? ", " : "",
 203                                    list->items[i].string);
 204                strbuf_addf(out, " and %s", list->items[list->nr - 1].string);
 205        }
 206}
 207
 208static void add_branch_desc(struct strbuf *out, const char *name)
 209{
 210        struct strbuf desc = STRBUF_INIT;
 211
 212        if (!read_branch_desc(&desc, name)) {
 213                const char *bp = desc.buf;
 214                while (*bp) {
 215                        const char *ep = strchrnul(bp, '\n');
 216                        if (*ep)
 217                                ep++;
 218                        strbuf_addf(out, "  : %.*s", (int)(ep - bp), bp);
 219                        bp = ep;
 220                }
 221                strbuf_complete_line(out);
 222        }
 223        strbuf_release(&desc);
 224}
 225
 226#define util_as_integral(elem) ((intptr_t)((elem)->util))
 227
 228static void record_person_from_buf(int which, struct string_list *people,
 229                                   const char *buffer)
 230{
 231        char *name_buf, *name, *name_end;
 232        struct string_list_item *elem;
 233        const char *field;
 234
 235        field = (which == 'a') ? "\nauthor " : "\ncommitter ";
 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
 249        elem = string_list_lookup(people, name_buf);
 250        if (!elem) {
 251                elem = string_list_insert(people, name_buf);
 252                elem->util = (void *)0;
 253        }
 254        elem->util = (void*)(util_as_integral(elem) + 1);
 255        free(name_buf);
 256}
 257
 258
 259static void record_person(int which, struct string_list *people,
 260                          struct commit *commit)
 261{
 262        const char *buffer = get_commit_buffer(commit, NULL);
 263        record_person_from_buf(which, people, buffer);
 264        unuse_commit_buffer(commit, buffer);
 265}
 266
 267static int cmp_string_list_util_as_integral(const void *a_, const void *b_)
 268{
 269        const struct string_list_item *a = a_, *b = b_;
 270        return util_as_integral(b) - util_as_integral(a);
 271}
 272
 273static void add_people_count(struct strbuf *out, struct string_list *people)
 274{
 275        if (people->nr == 1)
 276                strbuf_addstr(out, people->items[0].string);
 277        else if (people->nr == 2)
 278                strbuf_addf(out, "%s (%d) and %s (%d)",
 279                            people->items[0].string,
 280                            (int)util_as_integral(&people->items[0]),
 281                            people->items[1].string,
 282                            (int)util_as_integral(&people->items[1]));
 283        else if (people->nr)
 284                strbuf_addf(out, "%s (%d) and others",
 285                            people->items[0].string,
 286                            (int)util_as_integral(&people->items[0]));
 287}
 288
 289static void credit_people(struct strbuf *out,
 290                          struct string_list *them,
 291                          int kind)
 292{
 293        const char *label;
 294        const char *me;
 295
 296        if (kind == 'a') {
 297                label = "By";
 298                me = git_author_info(IDENT_NO_DATE);
 299        } else {
 300                label = "Via";
 301                me = git_committer_info(IDENT_NO_DATE);
 302        }
 303
 304        if (!them->nr ||
 305            (them->nr == 1 &&
 306             me &&
 307             skip_prefix(me, them->items->string, &me) &&
 308             starts_with(me, " <")))
 309                return;
 310        strbuf_addf(out, "\n%c %s ", comment_line_char, label);
 311        add_people_count(out, them);
 312}
 313
 314static void add_people_info(struct strbuf *out,
 315                            struct string_list *authors,
 316                            struct string_list *committers)
 317{
 318        QSORT(authors->items, authors->nr,
 319              cmp_string_list_util_as_integral);
 320        QSORT(committers->items, committers->nr,
 321              cmp_string_list_util_as_integral);
 322
 323        credit_people(out, authors, 'a');
 324        credit_people(out, committers, 'c');
 325}
 326
 327static void shortlog(const char *name,
 328                     struct origin_data *origin_data,
 329                     struct commit *head,
 330                     struct rev_info *rev,
 331                     struct fmt_merge_msg_opts *opts,
 332                     struct strbuf *out)
 333{
 334        int i, count = 0;
 335        struct commit *commit;
 336        struct object *branch;
 337        struct string_list subjects = STRING_LIST_INIT_DUP;
 338        struct string_list authors = STRING_LIST_INIT_DUP;
 339        struct string_list committers = STRING_LIST_INIT_DUP;
 340        int flags = UNINTERESTING | TREESAME | SEEN | SHOWN | ADDED;
 341        struct strbuf sb = STRBUF_INIT;
 342        const struct object_id *oid = &origin_data->oid;
 343        int limit = opts->shortlog_len;
 344
 345        branch = deref_tag(parse_object(oid), oid_to_hex(oid), GIT_SHA1_HEXSZ);
 346        if (!branch || branch->type != OBJ_COMMIT)
 347                return;
 348
 349        setup_revisions(0, NULL, rev, NULL);
 350        add_pending_object(rev, branch, name);
 351        add_pending_object(rev, &head->object, "^HEAD");
 352        head->object.flags |= UNINTERESTING;
 353        if (prepare_revision_walk(rev))
 354                die("revision walk setup failed");
 355        while ((commit = get_revision(rev)) != NULL) {
 356                struct pretty_print_context ctx = {0};
 357
 358                if (commit->parents && commit->parents->next) {
 359                        /* do not list a merge but count committer */
 360                        if (opts->credit_people)
 361                                record_person('c', &committers, commit);
 362                        continue;
 363                }
 364                if (!count && opts->credit_people)
 365                        /* the 'tip' committer */
 366                        record_person('c', &committers, commit);
 367                if (opts->credit_people)
 368                        record_person('a', &authors, commit);
 369                count++;
 370                if (subjects.nr > limit)
 371                        continue;
 372
 373                format_commit_message(commit, "%s", &sb, &ctx);
 374                strbuf_ltrim(&sb);
 375
 376                if (!sb.len)
 377                        string_list_append(&subjects,
 378                                           oid_to_hex(&commit->object.oid));
 379                else
 380                        string_list_append_nodup(&subjects,
 381                                                 strbuf_detach(&sb, NULL));
 382        }
 383
 384        if (opts->credit_people)
 385                add_people_info(out, &authors, &committers);
 386        if (count > limit)
 387                strbuf_addf(out, "\n* %s: (%d commits)\n", name, count);
 388        else
 389                strbuf_addf(out, "\n* %s:\n", name);
 390
 391        if (origin_data->is_local_branch && use_branch_desc)
 392                add_branch_desc(out, name);
 393
 394        for (i = 0; i < subjects.nr; i++)
 395                if (i >= limit)
 396                        strbuf_addstr(out, "  ...\n");
 397                else
 398                        strbuf_addf(out, "  %s\n", subjects.items[i].string);
 399
 400        clear_commit_marks((struct commit *)branch, flags);
 401        clear_commit_marks(head, flags);
 402        free_commit_list(rev->commits);
 403        rev->commits = NULL;
 404        rev->pending.nr = 0;
 405
 406        string_list_clear(&authors, 0);
 407        string_list_clear(&committers, 0);
 408        string_list_clear(&subjects, 0);
 409}
 410
 411static void fmt_merge_msg_title(struct strbuf *out,
 412                                const char *current_branch)
 413{
 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, struct object_id *head)
 538{
 539        struct commit_list *parents;
 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                struct object_id oid;
 549                struct commit *parent;
 550                struct object *obj;
 551
 552                len = newline ? newline - p : strlen(p);
 553                pos += len + !!newline;
 554
 555                if (len < GIT_SHA1_HEXSZ + 3 ||
 556                    get_oid_hex(p, &oid) ||
 557                    p[GIT_SHA1_HEXSZ] != '\t' ||
 558                    p[GIT_SHA1_HEXSZ + 1] != '\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(&oid);
 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->oid, &parent->object.oid);
 571        }
 572        head_commit = lookup_commit(head);
 573        if (head_commit)
 574                commit_list_insert(head_commit, &parents);
 575        reduce_heads_replace(&parents);
 576
 577        while (parents) {
 578                struct commit *cmit = pop_commit(&parents);
 579                for (i = 0; i < result->nr; i++)
 580                        if (!oidcmp(&result->item[i].commit, &cmit->object.oid))
 581                                result->item[i].used = 1;
 582        }
 583
 584        for (i = j = 0; i < result->nr; i++) {
 585                if (result->item[i].used) {
 586                        if (i != j)
 587                                result->item[j] = result->item[i];
 588                        j++;
 589                }
 590        }
 591        result->nr = j;
 592}
 593
 594int fmt_merge_msg(struct strbuf *in, struct strbuf *out,
 595                  struct fmt_merge_msg_opts *opts)
 596{
 597        int i = 0, pos = 0;
 598        struct object_id head_oid;
 599        const char *current_branch;
 600        void *current_branch_to_free;
 601        struct merge_parents merge_parents;
 602
 603        memset(&merge_parents, 0, sizeof(merge_parents));
 604
 605        /* get current branch */
 606        current_branch = current_branch_to_free =
 607                resolve_refdup("HEAD", RESOLVE_REF_READING, &head_oid, NULL);
 608        if (!current_branch)
 609                die("No current branch");
 610        if (starts_with(current_branch, "refs/heads/"))
 611                current_branch += 11;
 612
 613        find_merge_parents(&merge_parents, in, &head_oid);
 614
 615        /* get a line */
 616        while (pos < in->len) {
 617                int len;
 618                char *newline, *p = in->buf + pos;
 619
 620                newline = strchr(p, '\n');
 621                len = newline ? newline - p : strlen(p);
 622                pos += len + !!newline;
 623                i++;
 624                p[len] = 0;
 625                if (handle_line(p, &merge_parents))
 626                        die ("Error in line %d: %.*s", i, len, p);
 627        }
 628
 629        if (opts->add_title && srcs.nr)
 630                fmt_merge_msg_title(out, current_branch);
 631
 632        if (origins.nr)
 633                fmt_merge_msg_sigs(out);
 634
 635        if (opts->shortlog_len) {
 636                struct commit *head;
 637                struct rev_info rev;
 638
 639                head = lookup_commit_or_die(&head_oid, "HEAD");
 640                init_revisions(&rev, NULL);
 641                rev.commit_format = CMIT_FMT_ONELINE;
 642                rev.ignore_merges = 1;
 643                rev.limited = 1;
 644
 645                strbuf_complete_line(out);
 646
 647                for (i = 0; i < origins.nr; i++)
 648                        shortlog(origins.items[i].string,
 649                                 origins.items[i].util,
 650                                 head, &rev, opts, out);
 651        }
 652
 653        strbuf_complete_line(out);
 654        free(current_branch_to_free);
 655        free(merge_parents.item);
 656        return 0;
 657}
 658
 659int cmd_fmt_merge_msg(int argc, const char **argv, const char *prefix)
 660{
 661        const char *inpath = NULL;
 662        const char *message = NULL;
 663        int shortlog_len = -1;
 664        struct option options[] = {
 665                { OPTION_INTEGER, 0, "log", &shortlog_len, N_("n"),
 666                  N_("populate log with at most <n> entries from shortlog"),
 667                  PARSE_OPT_OPTARG, NULL, DEFAULT_MERGE_LOG_LEN },
 668                { OPTION_INTEGER, 0, "summary", &shortlog_len, N_("n"),
 669                  N_("alias for --log (deprecated)"),
 670                  PARSE_OPT_OPTARG | PARSE_OPT_HIDDEN, NULL,
 671                  DEFAULT_MERGE_LOG_LEN },
 672                OPT_STRING('m', "message", &message, N_("text"),
 673                        N_("use <text> as start of message")),
 674                OPT_FILENAME('F', "file", &inpath, N_("file to read from")),
 675                OPT_END()
 676        };
 677
 678        FILE *in = stdin;
 679        struct strbuf input = STRBUF_INIT, output = STRBUF_INIT;
 680        int ret;
 681        struct fmt_merge_msg_opts opts;
 682
 683        git_config(fmt_merge_msg_config, NULL);
 684        argc = parse_options(argc, argv, prefix, options, fmt_merge_msg_usage,
 685                             0);
 686        if (argc > 0)
 687                usage_with_options(fmt_merge_msg_usage, options);
 688        if (shortlog_len < 0)
 689                shortlog_len = (merge_log_config > 0) ? merge_log_config : 0;
 690
 691        if (inpath && strcmp(inpath, "-")) {
 692                in = fopen(inpath, "r");
 693                if (!in)
 694                        die_errno("cannot open '%s'", inpath);
 695        }
 696
 697        if (strbuf_read(&input, fileno(in), 0) < 0)
 698                die_errno("could not read input file");
 699
 700        if (message)
 701                strbuf_addstr(&output, message);
 702
 703        memset(&opts, 0, sizeof(opts));
 704        opts.add_title = !message;
 705        opts.credit_people = 1;
 706        opts.shortlog_len = shortlog_len;
 707
 708        ret = fmt_merge_msg(&input, &output, &opts);
 709        if (ret)
 710                return ret;
 711        write_in_full(STDOUT_FILENO, output.buf, output.len);
 712        return 0;
 713}