pretty.con commit Sync with 1.8.1 maintenance track (92e0d91)
   1#include "cache.h"
   2#include "commit.h"
   3#include "utf8.h"
   4#include "diff.h"
   5#include "revision.h"
   6#include "string-list.h"
   7#include "mailmap.h"
   8#include "log-tree.h"
   9#include "notes.h"
  10#include "color.h"
  11#include "reflog-walk.h"
  12#include "gpg-interface.h"
  13
  14static char *user_format;
  15static struct cmt_fmt_map {
  16        const char *name;
  17        enum cmit_fmt format;
  18        int is_tformat;
  19        int is_alias;
  20        const char *user_format;
  21} *commit_formats;
  22static size_t builtin_formats_len;
  23static size_t commit_formats_len;
  24static size_t commit_formats_alloc;
  25static struct cmt_fmt_map *find_commit_format(const char *sought);
  26
  27static void save_user_format(struct rev_info *rev, const char *cp, int is_tformat)
  28{
  29        free(user_format);
  30        user_format = xstrdup(cp);
  31        if (is_tformat)
  32                rev->use_terminator = 1;
  33        rev->commit_format = CMIT_FMT_USERFORMAT;
  34}
  35
  36static int git_pretty_formats_config(const char *var, const char *value, void *cb)
  37{
  38        struct cmt_fmt_map *commit_format = NULL;
  39        const char *name;
  40        const char *fmt;
  41        int i;
  42
  43        if (prefixcmp(var, "pretty."))
  44                return 0;
  45
  46        name = var + strlen("pretty.");
  47        for (i = 0; i < builtin_formats_len; i++) {
  48                if (!strcmp(commit_formats[i].name, name))
  49                        return 0;
  50        }
  51
  52        for (i = builtin_formats_len; i < commit_formats_len; i++) {
  53                if (!strcmp(commit_formats[i].name, name)) {
  54                        commit_format = &commit_formats[i];
  55                        break;
  56                }
  57        }
  58
  59        if (!commit_format) {
  60                ALLOC_GROW(commit_formats, commit_formats_len+1,
  61                           commit_formats_alloc);
  62                commit_format = &commit_formats[commit_formats_len];
  63                memset(commit_format, 0, sizeof(*commit_format));
  64                commit_formats_len++;
  65        }
  66
  67        commit_format->name = xstrdup(name);
  68        commit_format->format = CMIT_FMT_USERFORMAT;
  69        git_config_string(&fmt, var, value);
  70        if (!prefixcmp(fmt, "format:") || !prefixcmp(fmt, "tformat:")) {
  71                commit_format->is_tformat = fmt[0] == 't';
  72                fmt = strchr(fmt, ':') + 1;
  73        } else if (strchr(fmt, '%'))
  74                commit_format->is_tformat = 1;
  75        else
  76                commit_format->is_alias = 1;
  77        commit_format->user_format = fmt;
  78
  79        return 0;
  80}
  81
  82static void setup_commit_formats(void)
  83{
  84        struct cmt_fmt_map builtin_formats[] = {
  85                { "raw",        CMIT_FMT_RAW,           0 },
  86                { "medium",     CMIT_FMT_MEDIUM,        0 },
  87                { "short",      CMIT_FMT_SHORT,         0 },
  88                { "email",      CMIT_FMT_EMAIL,         0 },
  89                { "fuller",     CMIT_FMT_FULLER,        0 },
  90                { "full",       CMIT_FMT_FULL,          0 },
  91                { "oneline",    CMIT_FMT_ONELINE,       1 }
  92        };
  93        commit_formats_len = ARRAY_SIZE(builtin_formats);
  94        builtin_formats_len = commit_formats_len;
  95        ALLOC_GROW(commit_formats, commit_formats_len, commit_formats_alloc);
  96        memcpy(commit_formats, builtin_formats,
  97               sizeof(*builtin_formats)*ARRAY_SIZE(builtin_formats));
  98
  99        git_config(git_pretty_formats_config, NULL);
 100}
 101
 102static struct cmt_fmt_map *find_commit_format_recursive(const char *sought,
 103                                                        const char *original,
 104                                                        int num_redirections)
 105{
 106        struct cmt_fmt_map *found = NULL;
 107        size_t found_match_len = 0;
 108        int i;
 109
 110        if (num_redirections >= commit_formats_len)
 111                die("invalid --pretty format: "
 112                    "'%s' references an alias which points to itself",
 113                    original);
 114
 115        for (i = 0; i < commit_formats_len; i++) {
 116                size_t match_len;
 117
 118                if (prefixcmp(commit_formats[i].name, sought))
 119                        continue;
 120
 121                match_len = strlen(commit_formats[i].name);
 122                if (found == NULL || found_match_len > match_len) {
 123                        found = &commit_formats[i];
 124                        found_match_len = match_len;
 125                }
 126        }
 127
 128        if (found && found->is_alias) {
 129                found = find_commit_format_recursive(found->user_format,
 130                                                     original,
 131                                                     num_redirections+1);
 132        }
 133
 134        return found;
 135}
 136
 137static struct cmt_fmt_map *find_commit_format(const char *sought)
 138{
 139        if (!commit_formats)
 140                setup_commit_formats();
 141
 142        return find_commit_format_recursive(sought, sought, 0);
 143}
 144
 145void get_commit_format(const char *arg, struct rev_info *rev)
 146{
 147        struct cmt_fmt_map *commit_format;
 148
 149        rev->use_terminator = 0;
 150        if (!arg || !*arg) {
 151                rev->commit_format = CMIT_FMT_DEFAULT;
 152                return;
 153        }
 154        if (!prefixcmp(arg, "format:") || !prefixcmp(arg, "tformat:")) {
 155                save_user_format(rev, strchr(arg, ':') + 1, arg[0] == 't');
 156                return;
 157        }
 158
 159        if (strchr(arg, '%')) {
 160                save_user_format(rev, arg, 1);
 161                return;
 162        }
 163
 164        commit_format = find_commit_format(arg);
 165        if (!commit_format)
 166                die("invalid --pretty format: %s", arg);
 167
 168        rev->commit_format = commit_format->format;
 169        rev->use_terminator = commit_format->is_tformat;
 170        if (commit_format->format == CMIT_FMT_USERFORMAT) {
 171                save_user_format(rev, commit_format->user_format,
 172                                 commit_format->is_tformat);
 173        }
 174}
 175
 176/*
 177 * Generic support for pretty-printing the header
 178 */
 179static int get_one_line(const char *msg)
 180{
 181        int ret = 0;
 182
 183        for (;;) {
 184                char c = *msg++;
 185                if (!c)
 186                        break;
 187                ret++;
 188                if (c == '\n')
 189                        break;
 190        }
 191        return ret;
 192}
 193
 194/* High bit set, or ISO-2022-INT */
 195static int non_ascii(int ch)
 196{
 197        return !isascii(ch) || ch == '\033';
 198}
 199
 200int has_non_ascii(const char *s)
 201{
 202        int ch;
 203        if (!s)
 204                return 0;
 205        while ((ch = *s++) != '\0') {
 206                if (non_ascii(ch))
 207                        return 1;
 208        }
 209        return 0;
 210}
 211
 212static int is_rfc822_special(char ch)
 213{
 214        switch (ch) {
 215        case '(':
 216        case ')':
 217        case '<':
 218        case '>':
 219        case '[':
 220        case ']':
 221        case ':':
 222        case ';':
 223        case '@':
 224        case ',':
 225        case '.':
 226        case '"':
 227        case '\\':
 228                return 1;
 229        default:
 230                return 0;
 231        }
 232}
 233
 234static int needs_rfc822_quoting(const char *s, int len)
 235{
 236        int i;
 237        for (i = 0; i < len; i++)
 238                if (is_rfc822_special(s[i]))
 239                        return 1;
 240        return 0;
 241}
 242
 243static int last_line_length(struct strbuf *sb)
 244{
 245        int i;
 246
 247        /* How many bytes are already used on the last line? */
 248        for (i = sb->len - 1; i >= 0; i--)
 249                if (sb->buf[i] == '\n')
 250                        break;
 251        return sb->len - (i + 1);
 252}
 253
 254static void add_rfc822_quoted(struct strbuf *out, const char *s, int len)
 255{
 256        int i;
 257
 258        /* just a guess, we may have to also backslash-quote */
 259        strbuf_grow(out, len + 2);
 260
 261        strbuf_addch(out, '"');
 262        for (i = 0; i < len; i++) {
 263                switch (s[i]) {
 264                case '"':
 265                case '\\':
 266                        strbuf_addch(out, '\\');
 267                        /* fall through */
 268                default:
 269                        strbuf_addch(out, s[i]);
 270                }
 271        }
 272        strbuf_addch(out, '"');
 273}
 274
 275enum rfc2047_type {
 276        RFC2047_SUBJECT,
 277        RFC2047_ADDRESS,
 278};
 279
 280static int is_rfc2047_special(char ch, enum rfc2047_type type)
 281{
 282        /*
 283         * rfc2047, section 4.2:
 284         *
 285         *    8-bit values which correspond to printable ASCII characters other
 286         *    than "=", "?", and "_" (underscore), MAY be represented as those
 287         *    characters.  (But see section 5 for restrictions.)  In
 288         *    particular, SPACE and TAB MUST NOT be represented as themselves
 289         *    within encoded words.
 290         */
 291
 292        /*
 293         * rule out non-ASCII characters and non-printable characters (the
 294         * non-ASCII check should be redundant as isprint() is not localized
 295         * and only knows about ASCII, but be defensive about that)
 296         */
 297        if (non_ascii(ch) || !isprint(ch))
 298                return 1;
 299
 300        /*
 301         * rule out special printable characters (' ' should be the only
 302         * whitespace character considered printable, but be defensive and use
 303         * isspace())
 304         */
 305        if (isspace(ch) || ch == '=' || ch == '?' || ch == '_')
 306                return 1;
 307
 308        /*
 309         * rfc2047, section 5.3:
 310         *
 311         *    As a replacement for a 'word' entity within a 'phrase', for example,
 312         *    one that precedes an address in a From, To, or Cc header.  The ABNF
 313         *    definition for 'phrase' from RFC 822 thus becomes:
 314         *
 315         *    phrase = 1*( encoded-word / word )
 316         *
 317         *    In this case the set of characters that may be used in a "Q"-encoded
 318         *    'encoded-word' is restricted to: <upper and lower case ASCII
 319         *    letters, decimal digits, "!", "*", "+", "-", "/", "=", and "_"
 320         *    (underscore, ASCII 95.)>.  An 'encoded-word' that appears within a
 321         *    'phrase' MUST be separated from any adjacent 'word', 'text' or
 322         *    'special' by 'linear-white-space'.
 323         */
 324
 325        if (type != RFC2047_ADDRESS)
 326                return 0;
 327
 328        /* '=' and '_' are special cases and have been checked above */
 329        return !(isalnum(ch) || ch == '!' || ch == '*' || ch == '+' || ch == '-' || ch == '/');
 330}
 331
 332static int needs_rfc2047_encoding(const char *line, int len,
 333                                  enum rfc2047_type type)
 334{
 335        int i;
 336
 337        for (i = 0; i < len; i++) {
 338                int ch = line[i];
 339                if (non_ascii(ch) || ch == '\n')
 340                        return 1;
 341                if ((i + 1 < len) && (ch == '=' && line[i+1] == '?'))
 342                        return 1;
 343        }
 344
 345        return 0;
 346}
 347
 348static void add_rfc2047(struct strbuf *sb, const char *line, int len,
 349                       const char *encoding, enum rfc2047_type type)
 350{
 351        static const int max_encoded_length = 76; /* per rfc2047 */
 352        int i;
 353        int line_len = last_line_length(sb);
 354
 355        strbuf_grow(sb, len * 3 + strlen(encoding) + 100);
 356        strbuf_addf(sb, "=?%s?q?", encoding);
 357        line_len += strlen(encoding) + 5; /* 5 for =??q? */
 358        for (i = 0; i < len; i++) {
 359                unsigned ch = line[i] & 0xFF;
 360                int is_special = is_rfc2047_special(ch, type);
 361
 362                /*
 363                 * According to RFC 2047, we could encode the special character
 364                 * ' ' (space) with '_' (underscore) for readability. But many
 365                 * programs do not understand this and just leave the
 366                 * underscore in place. Thus, we do nothing special here, which
 367                 * causes ' ' to be encoded as '=20', avoiding this problem.
 368                 */
 369
 370                if (line_len + 2 + (is_special ? 3 : 1) > max_encoded_length) {
 371                        strbuf_addf(sb, "?=\n =?%s?q?", encoding);
 372                        line_len = strlen(encoding) + 5 + 1; /* =??q? plus SP */
 373                }
 374
 375                if (is_special) {
 376                        strbuf_addf(sb, "=%02X", ch);
 377                        line_len += 3;
 378                } else {
 379                        strbuf_addch(sb, ch);
 380                        line_len++;
 381                }
 382        }
 383        strbuf_addstr(sb, "?=");
 384}
 385
 386void pp_user_info(const struct pretty_print_context *pp,
 387                  const char *what, struct strbuf *sb,
 388                  const char *line, const char *encoding)
 389{
 390        struct strbuf name;
 391        struct strbuf mail;
 392        struct ident_split ident;
 393        int linelen;
 394        char *line_end, *date;
 395        const char *mailbuf, *namebuf;
 396        size_t namelen, maillen;
 397        int max_length = 78; /* per rfc2822 */
 398        unsigned long time;
 399        int tz;
 400
 401        if (pp->fmt == CMIT_FMT_ONELINE)
 402                return;
 403
 404        line_end = strchr(line, '\n');
 405        if (!line_end) {
 406                line_end = strchr(line, '\0');
 407                if (!line_end)
 408                        return;
 409        }
 410
 411        linelen = ++line_end - line;
 412        if (split_ident_line(&ident, line, linelen))
 413                return;
 414
 415
 416        mailbuf = ident.mail_begin;
 417        maillen = ident.mail_end - ident.mail_begin;
 418        namebuf = ident.name_begin;
 419        namelen = ident.name_end - ident.name_begin;
 420
 421        if (pp->mailmap)
 422                map_user(pp->mailmap, &mailbuf, &maillen, &namebuf, &namelen);
 423
 424        strbuf_init(&mail, 0);
 425        strbuf_init(&name, 0);
 426
 427        strbuf_add(&mail, mailbuf, maillen);
 428        strbuf_add(&name, namebuf, namelen);
 429
 430        namelen = name.len + mail.len + 3; /* ' ' + '<' + '>' */
 431        time = strtoul(ident.date_begin, &date, 10);
 432        tz = strtol(date, NULL, 10);
 433
 434        if (pp->fmt == CMIT_FMT_EMAIL) {
 435                strbuf_addstr(sb, "From: ");
 436                if (needs_rfc2047_encoding(name.buf, name.len, RFC2047_ADDRESS)) {
 437                        add_rfc2047(sb, name.buf, name.len,
 438                                    encoding, RFC2047_ADDRESS);
 439                        max_length = 76; /* per rfc2047 */
 440                } else if (needs_rfc822_quoting(name.buf, name.len)) {
 441                        struct strbuf quoted = STRBUF_INIT;
 442                        add_rfc822_quoted(&quoted, name.buf, name.len);
 443                        strbuf_add_wrapped_bytes(sb, quoted.buf, quoted.len,
 444                                                        -6, 1, max_length);
 445                        strbuf_release(&quoted);
 446                } else {
 447                        strbuf_add_wrapped_bytes(sb, name.buf, name.len,
 448                                                 -6, 1, max_length);
 449                }
 450                if (namelen - name.len + last_line_length(sb) > max_length)
 451                        strbuf_addch(sb, '\n');
 452
 453                strbuf_addf(sb, " <%s>\n", mail.buf);
 454        } else {
 455                strbuf_addf(sb, "%s: %.*s%s <%s>\n", what,
 456                              (pp->fmt == CMIT_FMT_FULLER) ? 4 : 0,
 457                              "    ", name.buf, mail.buf);
 458        }
 459
 460        strbuf_release(&mail);
 461        strbuf_release(&name);
 462
 463        switch (pp->fmt) {
 464        case CMIT_FMT_MEDIUM:
 465                strbuf_addf(sb, "Date:   %s\n", show_date(time, tz, pp->date_mode));
 466                break;
 467        case CMIT_FMT_EMAIL:
 468                strbuf_addf(sb, "Date: %s\n", show_date(time, tz, DATE_RFC2822));
 469                break;
 470        case CMIT_FMT_FULLER:
 471                strbuf_addf(sb, "%sDate: %s\n", what, show_date(time, tz, pp->date_mode));
 472                break;
 473        default:
 474                /* notin' */
 475                break;
 476        }
 477}
 478
 479static int is_empty_line(const char *line, int *len_p)
 480{
 481        int len = *len_p;
 482        while (len && isspace(line[len-1]))
 483                len--;
 484        *len_p = len;
 485        return !len;
 486}
 487
 488static const char *skip_empty_lines(const char *msg)
 489{
 490        for (;;) {
 491                int linelen = get_one_line(msg);
 492                int ll = linelen;
 493                if (!linelen)
 494                        break;
 495                if (!is_empty_line(msg, &ll))
 496                        break;
 497                msg += linelen;
 498        }
 499        return msg;
 500}
 501
 502static void add_merge_info(const struct pretty_print_context *pp,
 503                           struct strbuf *sb, const struct commit *commit)
 504{
 505        struct commit_list *parent = commit->parents;
 506
 507        if ((pp->fmt == CMIT_FMT_ONELINE) || (pp->fmt == CMIT_FMT_EMAIL) ||
 508            !parent || !parent->next)
 509                return;
 510
 511        strbuf_addstr(sb, "Merge:");
 512
 513        while (parent) {
 514                struct commit *p = parent->item;
 515                const char *hex = NULL;
 516                if (pp->abbrev)
 517                        hex = find_unique_abbrev(p->object.sha1, pp->abbrev);
 518                if (!hex)
 519                        hex = sha1_to_hex(p->object.sha1);
 520                parent = parent->next;
 521
 522                strbuf_addf(sb, " %s", hex);
 523        }
 524        strbuf_addch(sb, '\n');
 525}
 526
 527static char *get_header(const struct commit *commit, const char *msg,
 528                        const char *key)
 529{
 530        int key_len = strlen(key);
 531        const char *line = msg;
 532
 533        while (line) {
 534                const char *eol = strchr(line, '\n'), *next;
 535
 536                if (line == eol)
 537                        return NULL;
 538                if (!eol) {
 539                        warning("malformed commit (header is missing newline): %s",
 540                                sha1_to_hex(commit->object.sha1));
 541                        eol = line + strlen(line);
 542                        next = NULL;
 543                } else
 544                        next = eol + 1;
 545                if (eol - line > key_len &&
 546                    !strncmp(line, key, key_len) &&
 547                    line[key_len] == ' ') {
 548                        return xmemdupz(line + key_len + 1, eol - line - key_len - 1);
 549                }
 550                line = next;
 551        }
 552        return NULL;
 553}
 554
 555static char *replace_encoding_header(char *buf, const char *encoding)
 556{
 557        struct strbuf tmp = STRBUF_INIT;
 558        size_t start, len;
 559        char *cp = buf;
 560
 561        /* guess if there is an encoding header before a \n\n */
 562        while (strncmp(cp, "encoding ", strlen("encoding "))) {
 563                cp = strchr(cp, '\n');
 564                if (!cp || *++cp == '\n')
 565                        return buf;
 566        }
 567        start = cp - buf;
 568        cp = strchr(cp, '\n');
 569        if (!cp)
 570                return buf; /* should not happen but be defensive */
 571        len = cp + 1 - (buf + start);
 572
 573        strbuf_attach(&tmp, buf, strlen(buf), strlen(buf) + 1);
 574        if (is_encoding_utf8(encoding)) {
 575                /* we have re-coded to UTF-8; drop the header */
 576                strbuf_remove(&tmp, start, len);
 577        } else {
 578                /* just replaces XXXX in 'encoding XXXX\n' */
 579                strbuf_splice(&tmp, start + strlen("encoding "),
 580                                          len - strlen("encoding \n"),
 581                                          encoding, strlen(encoding));
 582        }
 583        return strbuf_detach(&tmp, NULL);
 584}
 585
 586char *logmsg_reencode(const struct commit *commit,
 587                      const char *output_encoding)
 588{
 589        static const char *utf8 = "UTF-8";
 590        const char *use_encoding;
 591        char *encoding;
 592        char *msg = commit->buffer;
 593        char *out;
 594
 595        if (!msg) {
 596                enum object_type type;
 597                unsigned long size;
 598
 599                msg = read_sha1_file(commit->object.sha1, &type, &size);
 600                if (!msg)
 601                        die("Cannot read commit object %s",
 602                            sha1_to_hex(commit->object.sha1));
 603                if (type != OBJ_COMMIT)
 604                        die("Expected commit for '%s', got %s",
 605                            sha1_to_hex(commit->object.sha1), typename(type));
 606        }
 607
 608        if (!output_encoding || !*output_encoding)
 609                return msg;
 610        encoding = get_header(commit, msg, "encoding");
 611        use_encoding = encoding ? encoding : utf8;
 612        if (same_encoding(use_encoding, output_encoding)) {
 613                /*
 614                 * No encoding work to be done. If we have no encoding header
 615                 * at all, then there's nothing to do, and we can return the
 616                 * message verbatim (whether newly allocated or not).
 617                 */
 618                if (!encoding)
 619                        return msg;
 620
 621                /*
 622                 * Otherwise, we still want to munge the encoding header in the
 623                 * result, which will be done by modifying the buffer. If we
 624                 * are using a fresh copy, we can reuse it. But if we are using
 625                 * the cached copy from commit->buffer, we need to duplicate it
 626                 * to avoid munging commit->buffer.
 627                 */
 628                out = msg;
 629                if (out == commit->buffer)
 630                        out = xstrdup(out);
 631        }
 632        else {
 633                /*
 634                 * There's actual encoding work to do. Do the reencoding, which
 635                 * still leaves the header to be replaced in the next step. At
 636                 * this point, we are done with msg. If we allocated a fresh
 637                 * copy, we can free it.
 638                 */
 639                out = reencode_string(msg, output_encoding, use_encoding);
 640                if (out && msg != commit->buffer)
 641                        free(msg);
 642        }
 643
 644        /*
 645         * This replacement actually consumes the buffer we hand it, so we do
 646         * not have to worry about freeing the old "out" here.
 647         */
 648        if (out)
 649                out = replace_encoding_header(out, output_encoding);
 650
 651        free(encoding);
 652        /*
 653         * If the re-encoding failed, out might be NULL here; in that
 654         * case we just return the commit message verbatim.
 655         */
 656        return out ? out : msg;
 657}
 658
 659void logmsg_free(char *msg, const struct commit *commit)
 660{
 661        if (msg != commit->buffer)
 662                free(msg);
 663}
 664
 665static int mailmap_name(const char **email, size_t *email_len,
 666                        const char **name, size_t *name_len)
 667{
 668        static struct string_list *mail_map;
 669        if (!mail_map) {
 670                mail_map = xcalloc(1, sizeof(*mail_map));
 671                read_mailmap(mail_map, NULL);
 672        }
 673        return mail_map->nr && map_user(mail_map, email, email_len, name, name_len);
 674}
 675
 676static size_t format_person_part(struct strbuf *sb, char part,
 677                                 const char *msg, int len, enum date_mode dmode)
 678{
 679        /* currently all placeholders have same length */
 680        const int placeholder_len = 2;
 681        int tz;
 682        unsigned long date = 0;
 683        struct ident_split s;
 684        const char *name, *mail;
 685        size_t maillen, namelen;
 686
 687        if (split_ident_line(&s, msg, len) < 0)
 688                goto skip;
 689
 690        name = s.name_begin;
 691        namelen = s.name_end - s.name_begin;
 692        mail = s.mail_begin;
 693        maillen = s.mail_end - s.mail_begin;
 694
 695        if (part == 'N' || part == 'E') /* mailmap lookup */
 696                mailmap_name(&mail, &maillen, &name, &namelen);
 697        if (part == 'n' || part == 'N') {       /* name */
 698                strbuf_add(sb, name, namelen);
 699                return placeholder_len;
 700        }
 701        if (part == 'e' || part == 'E') {       /* email */
 702                strbuf_add(sb, mail, maillen);
 703                return placeholder_len;
 704        }
 705
 706        if (!s.date_begin)
 707                goto skip;
 708
 709        date = strtoul(s.date_begin, NULL, 10);
 710
 711        if (part == 't') {      /* date, UNIX timestamp */
 712                strbuf_add(sb, s.date_begin, s.date_end - s.date_begin);
 713                return placeholder_len;
 714        }
 715
 716        /* parse tz */
 717        tz = strtoul(s.tz_begin + 1, NULL, 10);
 718        if (*s.tz_begin == '-')
 719                tz = -tz;
 720
 721        switch (part) {
 722        case 'd':       /* date */
 723                strbuf_addstr(sb, show_date(date, tz, dmode));
 724                return placeholder_len;
 725        case 'D':       /* date, RFC2822 style */
 726                strbuf_addstr(sb, show_date(date, tz, DATE_RFC2822));
 727                return placeholder_len;
 728        case 'r':       /* date, relative */
 729                strbuf_addstr(sb, show_date(date, tz, DATE_RELATIVE));
 730                return placeholder_len;
 731        case 'i':       /* date, ISO 8601 */
 732                strbuf_addstr(sb, show_date(date, tz, DATE_ISO8601));
 733                return placeholder_len;
 734        }
 735
 736skip:
 737        /*
 738         * reading from either a bogus commit, or a reflog entry with
 739         * %gn, %ge, etc.; 'sb' cannot be updated, but we still need
 740         * to compute a valid return value.
 741         */
 742        if (part == 'n' || part == 'e' || part == 't' || part == 'd'
 743            || part == 'D' || part == 'r' || part == 'i')
 744                return placeholder_len;
 745
 746        return 0; /* unknown placeholder */
 747}
 748
 749struct chunk {
 750        size_t off;
 751        size_t len;
 752};
 753
 754struct format_commit_context {
 755        const struct commit *commit;
 756        const struct pretty_print_context *pretty_ctx;
 757        unsigned commit_header_parsed:1;
 758        unsigned commit_message_parsed:1;
 759        unsigned commit_signature_parsed:1;
 760        struct {
 761                char *gpg_output;
 762                char good_bad;
 763                char *signer;
 764        } signature;
 765        char *message;
 766        size_t width, indent1, indent2;
 767
 768        /* These offsets are relative to the start of the commit message. */
 769        struct chunk author;
 770        struct chunk committer;
 771        struct chunk encoding;
 772        size_t message_off;
 773        size_t subject_off;
 774        size_t body_off;
 775
 776        /* The following ones are relative to the result struct strbuf. */
 777        struct chunk abbrev_commit_hash;
 778        struct chunk abbrev_tree_hash;
 779        struct chunk abbrev_parent_hashes;
 780        size_t wrap_start;
 781};
 782
 783static int add_again(struct strbuf *sb, struct chunk *chunk)
 784{
 785        if (chunk->len) {
 786                strbuf_adddup(sb, chunk->off, chunk->len);
 787                return 1;
 788        }
 789
 790        /*
 791         * We haven't seen this chunk before.  Our caller is surely
 792         * going to add it the hard way now.  Remember the most likely
 793         * start of the to-be-added chunk: the current end of the
 794         * struct strbuf.
 795         */
 796        chunk->off = sb->len;
 797        return 0;
 798}
 799
 800static void parse_commit_header(struct format_commit_context *context)
 801{
 802        const char *msg = context->message;
 803        int i;
 804
 805        for (i = 0; msg[i]; i++) {
 806                int eol;
 807                for (eol = i; msg[eol] && msg[eol] != '\n'; eol++)
 808                        ; /* do nothing */
 809
 810                if (i == eol) {
 811                        break;
 812                } else if (!prefixcmp(msg + i, "author ")) {
 813                        context->author.off = i + 7;
 814                        context->author.len = eol - i - 7;
 815                } else if (!prefixcmp(msg + i, "committer ")) {
 816                        context->committer.off = i + 10;
 817                        context->committer.len = eol - i - 10;
 818                } else if (!prefixcmp(msg + i, "encoding ")) {
 819                        context->encoding.off = i + 9;
 820                        context->encoding.len = eol - i - 9;
 821                }
 822                i = eol;
 823        }
 824        context->message_off = i;
 825        context->commit_header_parsed = 1;
 826}
 827
 828static int istitlechar(char c)
 829{
 830        return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') ||
 831                (c >= '0' && c <= '9') || c == '.' || c == '_';
 832}
 833
 834static void format_sanitized_subject(struct strbuf *sb, const char *msg)
 835{
 836        size_t trimlen;
 837        size_t start_len = sb->len;
 838        int space = 2;
 839
 840        for (; *msg && *msg != '\n'; msg++) {
 841                if (istitlechar(*msg)) {
 842                        if (space == 1)
 843                                strbuf_addch(sb, '-');
 844                        space = 0;
 845                        strbuf_addch(sb, *msg);
 846                        if (*msg == '.')
 847                                while (*(msg+1) == '.')
 848                                        msg++;
 849                } else
 850                        space |= 1;
 851        }
 852
 853        /* trim any trailing '.' or '-' characters */
 854        trimlen = 0;
 855        while (sb->len - trimlen > start_len &&
 856                (sb->buf[sb->len - 1 - trimlen] == '.'
 857                || sb->buf[sb->len - 1 - trimlen] == '-'))
 858                trimlen++;
 859        strbuf_remove(sb, sb->len - trimlen, trimlen);
 860}
 861
 862const char *format_subject(struct strbuf *sb, const char *msg,
 863                           const char *line_separator)
 864{
 865        int first = 1;
 866
 867        for (;;) {
 868                const char *line = msg;
 869                int linelen = get_one_line(line);
 870
 871                msg += linelen;
 872                if (!linelen || is_empty_line(line, &linelen))
 873                        break;
 874
 875                if (!sb)
 876                        continue;
 877                strbuf_grow(sb, linelen + 2);
 878                if (!first)
 879                        strbuf_addstr(sb, line_separator);
 880                strbuf_add(sb, line, linelen);
 881                first = 0;
 882        }
 883        return msg;
 884}
 885
 886static void parse_commit_message(struct format_commit_context *c)
 887{
 888        const char *msg = c->message + c->message_off;
 889        const char *start = c->message;
 890
 891        msg = skip_empty_lines(msg);
 892        c->subject_off = msg - start;
 893
 894        msg = format_subject(NULL, msg, NULL);
 895        msg = skip_empty_lines(msg);
 896        c->body_off = msg - start;
 897
 898        c->commit_message_parsed = 1;
 899}
 900
 901static void format_decoration(struct strbuf *sb, const struct commit *commit)
 902{
 903        struct name_decoration *d;
 904        const char *prefix = " (";
 905
 906        load_ref_decorations(DECORATE_SHORT_REFS);
 907        d = lookup_decoration(&name_decoration, &commit->object);
 908        while (d) {
 909                strbuf_addstr(sb, prefix);
 910                prefix = ", ";
 911                strbuf_addstr(sb, d->name);
 912                d = d->next;
 913        }
 914        if (prefix[0] == ',')
 915                strbuf_addch(sb, ')');
 916}
 917
 918static void strbuf_wrap(struct strbuf *sb, size_t pos,
 919                        size_t width, size_t indent1, size_t indent2)
 920{
 921        struct strbuf tmp = STRBUF_INIT;
 922
 923        if (pos)
 924                strbuf_add(&tmp, sb->buf, pos);
 925        strbuf_add_wrapped_text(&tmp, sb->buf + pos,
 926                                (int) indent1, (int) indent2, (int) width);
 927        strbuf_swap(&tmp, sb);
 928        strbuf_release(&tmp);
 929}
 930
 931static void rewrap_message_tail(struct strbuf *sb,
 932                                struct format_commit_context *c,
 933                                size_t new_width, size_t new_indent1,
 934                                size_t new_indent2)
 935{
 936        if (c->width == new_width && c->indent1 == new_indent1 &&
 937            c->indent2 == new_indent2)
 938                return;
 939        if (c->wrap_start < sb->len)
 940                strbuf_wrap(sb, c->wrap_start, c->width, c->indent1, c->indent2);
 941        c->wrap_start = sb->len;
 942        c->width = new_width;
 943        c->indent1 = new_indent1;
 944        c->indent2 = new_indent2;
 945}
 946
 947static struct {
 948        char result;
 949        const char *check;
 950} signature_check[] = {
 951        { 'G', ": Good signature from " },
 952        { 'B', ": BAD signature from " },
 953};
 954
 955static void parse_signature_lines(struct format_commit_context *ctx)
 956{
 957        const char *buf = ctx->signature.gpg_output;
 958        int i;
 959
 960        for (i = 0; i < ARRAY_SIZE(signature_check); i++) {
 961                const char *found = strstr(buf, signature_check[i].check);
 962                const char *next;
 963                if (!found)
 964                        continue;
 965                ctx->signature.good_bad = signature_check[i].result;
 966                found += strlen(signature_check[i].check);
 967                next = strchrnul(found, '\n');
 968                ctx->signature.signer = xmemdupz(found, next - found);
 969                break;
 970        }
 971}
 972
 973static void parse_commit_signature(struct format_commit_context *ctx)
 974{
 975        struct strbuf payload = STRBUF_INIT;
 976        struct strbuf signature = STRBUF_INIT;
 977        struct strbuf gpg_output = STRBUF_INIT;
 978        int status;
 979
 980        ctx->commit_signature_parsed = 1;
 981
 982        if (parse_signed_commit(ctx->commit->object.sha1,
 983                                &payload, &signature) <= 0)
 984                goto out;
 985        status = verify_signed_buffer(payload.buf, payload.len,
 986                                      signature.buf, signature.len,
 987                                      &gpg_output);
 988        if (status && !gpg_output.len)
 989                goto out;
 990        ctx->signature.gpg_output = strbuf_detach(&gpg_output, NULL);
 991        parse_signature_lines(ctx);
 992
 993 out:
 994        strbuf_release(&gpg_output);
 995        strbuf_release(&payload);
 996        strbuf_release(&signature);
 997}
 998
 999
1000static int format_reflog_person(struct strbuf *sb,
1001                                char part,
1002                                struct reflog_walk_info *log,
1003                                enum date_mode dmode)
1004{
1005        const char *ident;
1006
1007        if (!log)
1008                return 2;
1009
1010        ident = get_reflog_ident(log);
1011        if (!ident)
1012                return 2;
1013
1014        return format_person_part(sb, part, ident, strlen(ident), dmode);
1015}
1016
1017static size_t format_commit_one(struct strbuf *sb, const char *placeholder,
1018                                void *context)
1019{
1020        struct format_commit_context *c = context;
1021        const struct commit *commit = c->commit;
1022        const char *msg = c->message;
1023        struct commit_list *p;
1024        int h1, h2;
1025
1026        /* these are independent of the commit */
1027        switch (placeholder[0]) {
1028        case 'C':
1029                if (placeholder[1] == '(') {
1030                        const char *begin = placeholder + 2;
1031                        const char *end = strchr(begin, ')');
1032                        char color[COLOR_MAXLEN];
1033
1034                        if (!end)
1035                                return 0;
1036                        if (!prefixcmp(begin, "auto,")) {
1037                                if (!want_color(c->pretty_ctx->color))
1038                                        return end - placeholder + 1;
1039                                begin += 5;
1040                        }
1041                        color_parse_mem(begin,
1042                                        end - begin,
1043                                        "--pretty format", color);
1044                        strbuf_addstr(sb, color);
1045                        return end - placeholder + 1;
1046                }
1047                if (!prefixcmp(placeholder + 1, "red")) {
1048                        strbuf_addstr(sb, GIT_COLOR_RED);
1049                        return 4;
1050                } else if (!prefixcmp(placeholder + 1, "green")) {
1051                        strbuf_addstr(sb, GIT_COLOR_GREEN);
1052                        return 6;
1053                } else if (!prefixcmp(placeholder + 1, "blue")) {
1054                        strbuf_addstr(sb, GIT_COLOR_BLUE);
1055                        return 5;
1056                } else if (!prefixcmp(placeholder + 1, "reset")) {
1057                        strbuf_addstr(sb, GIT_COLOR_RESET);
1058                        return 6;
1059                } else
1060                        return 0;
1061        case 'n':               /* newline */
1062                strbuf_addch(sb, '\n');
1063                return 1;
1064        case 'x':
1065                /* %x00 == NUL, %x0a == LF, etc. */
1066                if (0 <= (h1 = hexval_table[0xff & placeholder[1]]) &&
1067                    h1 <= 16 &&
1068                    0 <= (h2 = hexval_table[0xff & placeholder[2]]) &&
1069                    h2 <= 16) {
1070                        strbuf_addch(sb, (h1<<4)|h2);
1071                        return 3;
1072                } else
1073                        return 0;
1074        case 'w':
1075                if (placeholder[1] == '(') {
1076                        unsigned long width = 0, indent1 = 0, indent2 = 0;
1077                        char *next;
1078                        const char *start = placeholder + 2;
1079                        const char *end = strchr(start, ')');
1080                        if (!end)
1081                                return 0;
1082                        if (end > start) {
1083                                width = strtoul(start, &next, 10);
1084                                if (*next == ',') {
1085                                        indent1 = strtoul(next + 1, &next, 10);
1086                                        if (*next == ',') {
1087                                                indent2 = strtoul(next + 1,
1088                                                                 &next, 10);
1089                                        }
1090                                }
1091                                if (*next != ')')
1092                                        return 0;
1093                        }
1094                        rewrap_message_tail(sb, c, width, indent1, indent2);
1095                        return end - placeholder + 1;
1096                } else
1097                        return 0;
1098        }
1099
1100        /* these depend on the commit */
1101        if (!commit->object.parsed)
1102                parse_object(commit->object.sha1);
1103
1104        switch (placeholder[0]) {
1105        case 'H':               /* commit hash */
1106                strbuf_addstr(sb, sha1_to_hex(commit->object.sha1));
1107                return 1;
1108        case 'h':               /* abbreviated commit hash */
1109                if (add_again(sb, &c->abbrev_commit_hash))
1110                        return 1;
1111                strbuf_addstr(sb, find_unique_abbrev(commit->object.sha1,
1112                                                     c->pretty_ctx->abbrev));
1113                c->abbrev_commit_hash.len = sb->len - c->abbrev_commit_hash.off;
1114                return 1;
1115        case 'T':               /* tree hash */
1116                strbuf_addstr(sb, sha1_to_hex(commit->tree->object.sha1));
1117                return 1;
1118        case 't':               /* abbreviated tree hash */
1119                if (add_again(sb, &c->abbrev_tree_hash))
1120                        return 1;
1121                strbuf_addstr(sb, find_unique_abbrev(commit->tree->object.sha1,
1122                                                     c->pretty_ctx->abbrev));
1123                c->abbrev_tree_hash.len = sb->len - c->abbrev_tree_hash.off;
1124                return 1;
1125        case 'P':               /* parent hashes */
1126                for (p = commit->parents; p; p = p->next) {
1127                        if (p != commit->parents)
1128                                strbuf_addch(sb, ' ');
1129                        strbuf_addstr(sb, sha1_to_hex(p->item->object.sha1));
1130                }
1131                return 1;
1132        case 'p':               /* abbreviated parent hashes */
1133                if (add_again(sb, &c->abbrev_parent_hashes))
1134                        return 1;
1135                for (p = commit->parents; p; p = p->next) {
1136                        if (p != commit->parents)
1137                                strbuf_addch(sb, ' ');
1138                        strbuf_addstr(sb, find_unique_abbrev(
1139                                        p->item->object.sha1,
1140                                        c->pretty_ctx->abbrev));
1141                }
1142                c->abbrev_parent_hashes.len = sb->len -
1143                                              c->abbrev_parent_hashes.off;
1144                return 1;
1145        case 'm':               /* left/right/bottom */
1146                strbuf_addstr(sb, get_revision_mark(NULL, commit));
1147                return 1;
1148        case 'd':
1149                format_decoration(sb, commit);
1150                return 1;
1151        case 'g':               /* reflog info */
1152                switch(placeholder[1]) {
1153                case 'd':       /* reflog selector */
1154                case 'D':
1155                        if (c->pretty_ctx->reflog_info)
1156                                get_reflog_selector(sb,
1157                                                    c->pretty_ctx->reflog_info,
1158                                                    c->pretty_ctx->date_mode,
1159                                                    c->pretty_ctx->date_mode_explicit,
1160                                                    (placeholder[1] == 'd'));
1161                        return 2;
1162                case 's':       /* reflog message */
1163                        if (c->pretty_ctx->reflog_info)
1164                                get_reflog_message(sb, c->pretty_ctx->reflog_info);
1165                        return 2;
1166                case 'n':
1167                case 'N':
1168                case 'e':
1169                case 'E':
1170                        return format_reflog_person(sb,
1171                                                    placeholder[1],
1172                                                    c->pretty_ctx->reflog_info,
1173                                                    c->pretty_ctx->date_mode);
1174                }
1175                return 0;       /* unknown %g placeholder */
1176        case 'N':
1177                if (c->pretty_ctx->notes_message) {
1178                        strbuf_addstr(sb, c->pretty_ctx->notes_message);
1179                        return 1;
1180                }
1181                return 0;
1182        }
1183
1184        if (placeholder[0] == 'G') {
1185                if (!c->commit_signature_parsed)
1186                        parse_commit_signature(c);
1187                switch (placeholder[1]) {
1188                case 'G':
1189                        if (c->signature.gpg_output)
1190                                strbuf_addstr(sb, c->signature.gpg_output);
1191                        break;
1192                case '?':
1193                        switch (c->signature.good_bad) {
1194                        case 'G':
1195                        case 'B':
1196                                strbuf_addch(sb, c->signature.good_bad);
1197                        }
1198                        break;
1199                case 'S':
1200                        if (c->signature.signer)
1201                                strbuf_addstr(sb, c->signature.signer);
1202                        break;
1203                }
1204                return 2;
1205        }
1206
1207
1208        /* For the rest we have to parse the commit header. */
1209        if (!c->commit_header_parsed)
1210                parse_commit_header(c);
1211
1212        switch (placeholder[0]) {
1213        case 'a':       /* author ... */
1214                return format_person_part(sb, placeholder[1],
1215                                   msg + c->author.off, c->author.len,
1216                                   c->pretty_ctx->date_mode);
1217        case 'c':       /* committer ... */
1218                return format_person_part(sb, placeholder[1],
1219                                   msg + c->committer.off, c->committer.len,
1220                                   c->pretty_ctx->date_mode);
1221        case 'e':       /* encoding */
1222                strbuf_add(sb, msg + c->encoding.off, c->encoding.len);
1223                return 1;
1224        case 'B':       /* raw body */
1225                /* message_off is always left at the initial newline */
1226                strbuf_addstr(sb, msg + c->message_off + 1);
1227                return 1;
1228        }
1229
1230        /* Now we need to parse the commit message. */
1231        if (!c->commit_message_parsed)
1232                parse_commit_message(c);
1233
1234        switch (placeholder[0]) {
1235        case 's':       /* subject */
1236                format_subject(sb, msg + c->subject_off, " ");
1237                return 1;
1238        case 'f':       /* sanitized subject */
1239                format_sanitized_subject(sb, msg + c->subject_off);
1240                return 1;
1241        case 'b':       /* body */
1242                strbuf_addstr(sb, msg + c->body_off);
1243                return 1;
1244        }
1245        return 0;       /* unknown placeholder */
1246}
1247
1248static size_t format_commit_item(struct strbuf *sb, const char *placeholder,
1249                                 void *context)
1250{
1251        int consumed;
1252        size_t orig_len;
1253        enum {
1254                NO_MAGIC,
1255                ADD_LF_BEFORE_NON_EMPTY,
1256                DEL_LF_BEFORE_EMPTY,
1257                ADD_SP_BEFORE_NON_EMPTY
1258        } magic = NO_MAGIC;
1259
1260        switch (placeholder[0]) {
1261        case '-':
1262                magic = DEL_LF_BEFORE_EMPTY;
1263                break;
1264        case '+':
1265                magic = ADD_LF_BEFORE_NON_EMPTY;
1266                break;
1267        case ' ':
1268                magic = ADD_SP_BEFORE_NON_EMPTY;
1269                break;
1270        default:
1271                break;
1272        }
1273        if (magic != NO_MAGIC)
1274                placeholder++;
1275
1276        orig_len = sb->len;
1277        consumed = format_commit_one(sb, placeholder, context);
1278        if (magic == NO_MAGIC)
1279                return consumed;
1280
1281        if ((orig_len == sb->len) && magic == DEL_LF_BEFORE_EMPTY) {
1282                while (sb->len && sb->buf[sb->len - 1] == '\n')
1283                        strbuf_setlen(sb, sb->len - 1);
1284        } else if (orig_len != sb->len) {
1285                if (magic == ADD_LF_BEFORE_NON_EMPTY)
1286                        strbuf_insert(sb, orig_len, "\n", 1);
1287                else if (magic == ADD_SP_BEFORE_NON_EMPTY)
1288                        strbuf_insert(sb, orig_len, " ", 1);
1289        }
1290        return consumed + 1;
1291}
1292
1293static size_t userformat_want_item(struct strbuf *sb, const char *placeholder,
1294                                   void *context)
1295{
1296        struct userformat_want *w = context;
1297
1298        if (*placeholder == '+' || *placeholder == '-' || *placeholder == ' ')
1299                placeholder++;
1300
1301        switch (*placeholder) {
1302        case 'N':
1303                w->notes = 1;
1304                break;
1305        }
1306        return 0;
1307}
1308
1309void userformat_find_requirements(const char *fmt, struct userformat_want *w)
1310{
1311        struct strbuf dummy = STRBUF_INIT;
1312
1313        if (!fmt) {
1314                if (!user_format)
1315                        return;
1316                fmt = user_format;
1317        }
1318        strbuf_expand(&dummy, fmt, userformat_want_item, w);
1319        strbuf_release(&dummy);
1320}
1321
1322void format_commit_message(const struct commit *commit,
1323                           const char *format, struct strbuf *sb,
1324                           const struct pretty_print_context *pretty_ctx)
1325{
1326        struct format_commit_context context;
1327        const char *output_enc = pretty_ctx->output_encoding;
1328
1329        memset(&context, 0, sizeof(context));
1330        context.commit = commit;
1331        context.pretty_ctx = pretty_ctx;
1332        context.wrap_start = sb->len;
1333        context.message = logmsg_reencode(commit, output_enc);
1334
1335        strbuf_expand(sb, format, format_commit_item, &context);
1336        rewrap_message_tail(sb, &context, 0, 0, 0);
1337
1338        logmsg_free(context.message, commit);
1339        free(context.signature.gpg_output);
1340        free(context.signature.signer);
1341}
1342
1343static void pp_header(const struct pretty_print_context *pp,
1344                      const char *encoding,
1345                      const struct commit *commit,
1346                      const char **msg_p,
1347                      struct strbuf *sb)
1348{
1349        int parents_shown = 0;
1350
1351        for (;;) {
1352                const char *line = *msg_p;
1353                int linelen = get_one_line(*msg_p);
1354
1355                if (!linelen)
1356                        return;
1357                *msg_p += linelen;
1358
1359                if (linelen == 1)
1360                        /* End of header */
1361                        return;
1362
1363                if (pp->fmt == CMIT_FMT_RAW) {
1364                        strbuf_add(sb, line, linelen);
1365                        continue;
1366                }
1367
1368                if (!prefixcmp(line, "parent ")) {
1369                        if (linelen != 48)
1370                                die("bad parent line in commit");
1371                        continue;
1372                }
1373
1374                if (!parents_shown) {
1375                        struct commit_list *parent;
1376                        int num;
1377                        for (parent = commit->parents, num = 0;
1378                             parent;
1379                             parent = parent->next, num++)
1380                                ;
1381                        /* with enough slop */
1382                        strbuf_grow(sb, num * 50 + 20);
1383                        add_merge_info(pp, sb, commit);
1384                        parents_shown = 1;
1385                }
1386
1387                /*
1388                 * MEDIUM == DEFAULT shows only author with dates.
1389                 * FULL shows both authors but not dates.
1390                 * FULLER shows both authors and dates.
1391                 */
1392                if (!prefixcmp(line, "author ")) {
1393                        strbuf_grow(sb, linelen + 80);
1394                        pp_user_info(pp, "Author", sb, line + 7, encoding);
1395                }
1396                if (!prefixcmp(line, "committer ") &&
1397                    (pp->fmt == CMIT_FMT_FULL || pp->fmt == CMIT_FMT_FULLER)) {
1398                        strbuf_grow(sb, linelen + 80);
1399                        pp_user_info(pp, "Commit", sb, line + 10, encoding);
1400                }
1401        }
1402}
1403
1404void pp_title_line(const struct pretty_print_context *pp,
1405                   const char **msg_p,
1406                   struct strbuf *sb,
1407                   const char *encoding,
1408                   int need_8bit_cte)
1409{
1410        static const int max_length = 78; /* per rfc2047 */
1411        struct strbuf title;
1412
1413        strbuf_init(&title, 80);
1414        *msg_p = format_subject(&title, *msg_p,
1415                                pp->preserve_subject ? "\n" : " ");
1416
1417        strbuf_grow(sb, title.len + 1024);
1418        if (pp->subject) {
1419                strbuf_addstr(sb, pp->subject);
1420                if (needs_rfc2047_encoding(title.buf, title.len, RFC2047_SUBJECT))
1421                        add_rfc2047(sb, title.buf, title.len,
1422                                                encoding, RFC2047_SUBJECT);
1423                else
1424                        strbuf_add_wrapped_bytes(sb, title.buf, title.len,
1425                                         -last_line_length(sb), 1, max_length);
1426        } else {
1427                strbuf_addbuf(sb, &title);
1428        }
1429        strbuf_addch(sb, '\n');
1430
1431        if (need_8bit_cte > 0) {
1432                const char *header_fmt =
1433                        "MIME-Version: 1.0\n"
1434                        "Content-Type: text/plain; charset=%s\n"
1435                        "Content-Transfer-Encoding: 8bit\n";
1436                strbuf_addf(sb, header_fmt, encoding);
1437        }
1438        if (pp->after_subject) {
1439                strbuf_addstr(sb, pp->after_subject);
1440        }
1441        if (pp->fmt == CMIT_FMT_EMAIL) {
1442                strbuf_addch(sb, '\n');
1443        }
1444        strbuf_release(&title);
1445}
1446
1447void pp_remainder(const struct pretty_print_context *pp,
1448                  const char **msg_p,
1449                  struct strbuf *sb,
1450                  int indent)
1451{
1452        int first = 1;
1453        for (;;) {
1454                const char *line = *msg_p;
1455                int linelen = get_one_line(line);
1456                *msg_p += linelen;
1457
1458                if (!linelen)
1459                        break;
1460
1461                if (is_empty_line(line, &linelen)) {
1462                        if (first)
1463                                continue;
1464                        if (pp->fmt == CMIT_FMT_SHORT)
1465                                break;
1466                }
1467                first = 0;
1468
1469                strbuf_grow(sb, linelen + indent + 20);
1470                if (indent) {
1471                        memset(sb->buf + sb->len, ' ', indent);
1472                        strbuf_setlen(sb, sb->len + indent);
1473                }
1474                strbuf_add(sb, line, linelen);
1475                strbuf_addch(sb, '\n');
1476        }
1477}
1478
1479void pretty_print_commit(const struct pretty_print_context *pp,
1480                         const struct commit *commit,
1481                         struct strbuf *sb)
1482{
1483        unsigned long beginning_of_body;
1484        int indent = 4;
1485        const char *msg;
1486        char *reencoded;
1487        const char *encoding;
1488        int need_8bit_cte = pp->need_8bit_cte;
1489
1490        if (pp->fmt == CMIT_FMT_USERFORMAT) {
1491                format_commit_message(commit, user_format, sb, pp);
1492                return;
1493        }
1494
1495        encoding = get_log_output_encoding();
1496        msg = reencoded = logmsg_reencode(commit, encoding);
1497
1498        if (pp->fmt == CMIT_FMT_ONELINE || pp->fmt == CMIT_FMT_EMAIL)
1499                indent = 0;
1500
1501        /*
1502         * We need to check and emit Content-type: to mark it
1503         * as 8-bit if we haven't done so.
1504         */
1505        if (pp->fmt == CMIT_FMT_EMAIL && need_8bit_cte == 0) {
1506                int i, ch, in_body;
1507
1508                for (in_body = i = 0; (ch = msg[i]); i++) {
1509                        if (!in_body) {
1510                                /* author could be non 7-bit ASCII but
1511                                 * the log may be so; skip over the
1512                                 * header part first.
1513                                 */
1514                                if (ch == '\n' && msg[i+1] == '\n')
1515                                        in_body = 1;
1516                        }
1517                        else if (non_ascii(ch)) {
1518                                need_8bit_cte = 1;
1519                                break;
1520                        }
1521                }
1522        }
1523
1524        pp_header(pp, encoding, commit, &msg, sb);
1525        if (pp->fmt != CMIT_FMT_ONELINE && !pp->subject) {
1526                strbuf_addch(sb, '\n');
1527        }
1528
1529        /* Skip excess blank lines at the beginning of body, if any... */
1530        msg = skip_empty_lines(msg);
1531
1532        /* These formats treat the title line specially. */
1533        if (pp->fmt == CMIT_FMT_ONELINE || pp->fmt == CMIT_FMT_EMAIL)
1534                pp_title_line(pp, &msg, sb, encoding, need_8bit_cte);
1535
1536        beginning_of_body = sb->len;
1537        if (pp->fmt != CMIT_FMT_ONELINE)
1538                pp_remainder(pp, &msg, sb, indent);
1539        strbuf_rtrim(sb);
1540
1541        /* Make sure there is an EOLN for the non-oneline case */
1542        if (pp->fmt != CMIT_FMT_ONELINE)
1543                strbuf_addch(sb, '\n');
1544
1545        /*
1546         * The caller may append additional body text in e-mail
1547         * format.  Make sure we did not strip the blank line
1548         * between the header and the body.
1549         */
1550        if (pp->fmt == CMIT_FMT_EMAIL && sb->len <= beginning_of_body)
1551                strbuf_addch(sb, '\n');
1552
1553        logmsg_free(reencoded, commit);
1554}
1555
1556void pp_commit_easy(enum cmit_fmt fmt, const struct commit *commit,
1557                    struct strbuf *sb)
1558{
1559        struct pretty_print_context pp = {0};
1560        pp.fmt = fmt;
1561        pretty_print_commit(&pp, commit, sb);
1562}