b50ebf575501fb9f2c6b3c1a6463e0c22210cf0a
   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, size_t 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
 359        while (len) {
 360                /*
 361                 * RFC 2047, section 5 (3):
 362                 *
 363                 * Each 'encoded-word' MUST represent an integral number of
 364                 * characters.  A multi-octet character may not be split across
 365                 * adjacent 'encoded- word's.
 366                 */
 367                const unsigned char *p = (const unsigned char *)line;
 368                int chrlen = mbs_chrlen(&line, &len, encoding);
 369                int is_special = (chrlen > 1) || is_rfc2047_special(*p, type);
 370
 371                /* "=%02X" * chrlen, or the byte itself */
 372                const char *encoded_fmt = is_special ? "=%02X"    : "%c";
 373                int         encoded_len = is_special ? 3 * chrlen : 1;
 374
 375                /*
 376                 * According to RFC 2047, we could encode the special character
 377                 * ' ' (space) with '_' (underscore) for readability. But many
 378                 * programs do not understand this and just leave the
 379                 * underscore in place. Thus, we do nothing special here, which
 380                 * causes ' ' to be encoded as '=20', avoiding this problem.
 381                 */
 382
 383                if (line_len + encoded_len + 2 > max_encoded_length) {
 384                        /* It won't fit with trailing "?=" --- break the line */
 385                        strbuf_addf(sb, "?=\n =?%s?q?", encoding);
 386                        line_len = strlen(encoding) + 5 + 1; /* =??q? plus SP */
 387                }
 388
 389                for (i = 0; i < chrlen; i++)
 390                        strbuf_addf(sb, encoded_fmt, p[i]);
 391                line_len += encoded_len;
 392        }
 393        strbuf_addstr(sb, "?=");
 394}
 395
 396void pp_user_info(const struct pretty_print_context *pp,
 397                  const char *what, struct strbuf *sb,
 398                  const char *line, const char *encoding)
 399{
 400        struct strbuf name;
 401        struct strbuf mail;
 402        struct ident_split ident;
 403        int linelen;
 404        char *line_end, *date;
 405        const char *mailbuf, *namebuf;
 406        size_t namelen, maillen;
 407        int max_length = 78; /* per rfc2822 */
 408        unsigned long time;
 409        int tz;
 410
 411        if (pp->fmt == CMIT_FMT_ONELINE)
 412                return;
 413
 414        line_end = strchr(line, '\n');
 415        if (!line_end) {
 416                line_end = strchr(line, '\0');
 417                if (!line_end)
 418                        return;
 419        }
 420
 421        linelen = ++line_end - line;
 422        if (split_ident_line(&ident, line, linelen))
 423                return;
 424
 425
 426        mailbuf = ident.mail_begin;
 427        maillen = ident.mail_end - ident.mail_begin;
 428        namebuf = ident.name_begin;
 429        namelen = ident.name_end - ident.name_begin;
 430
 431        if (pp->mailmap)
 432                map_user(pp->mailmap, &mailbuf, &maillen, &namebuf, &namelen);
 433
 434        strbuf_init(&mail, 0);
 435        strbuf_init(&name, 0);
 436
 437        strbuf_add(&mail, mailbuf, maillen);
 438        strbuf_add(&name, namebuf, namelen);
 439
 440        namelen = name.len + mail.len + 3; /* ' ' + '<' + '>' */
 441        time = strtoul(ident.date_begin, &date, 10);
 442        tz = strtol(date, NULL, 10);
 443
 444        if (pp->fmt == CMIT_FMT_EMAIL) {
 445                strbuf_addstr(sb, "From: ");
 446                if (needs_rfc2047_encoding(name.buf, name.len, RFC2047_ADDRESS)) {
 447                        add_rfc2047(sb, name.buf, name.len,
 448                                    encoding, RFC2047_ADDRESS);
 449                        max_length = 76; /* per rfc2047 */
 450                } else if (needs_rfc822_quoting(name.buf, name.len)) {
 451                        struct strbuf quoted = STRBUF_INIT;
 452                        add_rfc822_quoted(&quoted, name.buf, name.len);
 453                        strbuf_add_wrapped_bytes(sb, quoted.buf, quoted.len,
 454                                                        -6, 1, max_length);
 455                        strbuf_release(&quoted);
 456                } else {
 457                        strbuf_add_wrapped_bytes(sb, name.buf, name.len,
 458                                                 -6, 1, max_length);
 459                }
 460                if (namelen - name.len + last_line_length(sb) > max_length)
 461                        strbuf_addch(sb, '\n');
 462
 463                strbuf_addf(sb, " <%s>\n", mail.buf);
 464        } else {
 465                strbuf_addf(sb, "%s: %.*s%s <%s>\n", what,
 466                              (pp->fmt == CMIT_FMT_FULLER) ? 4 : 0,
 467                              "    ", name.buf, mail.buf);
 468        }
 469
 470        strbuf_release(&mail);
 471        strbuf_release(&name);
 472
 473        switch (pp->fmt) {
 474        case CMIT_FMT_MEDIUM:
 475                strbuf_addf(sb, "Date:   %s\n", show_date(time, tz, pp->date_mode));
 476                break;
 477        case CMIT_FMT_EMAIL:
 478                strbuf_addf(sb, "Date: %s\n", show_date(time, tz, DATE_RFC2822));
 479                break;
 480        case CMIT_FMT_FULLER:
 481                strbuf_addf(sb, "%sDate: %s\n", what, show_date(time, tz, pp->date_mode));
 482                break;
 483        default:
 484                /* notin' */
 485                break;
 486        }
 487}
 488
 489static int is_empty_line(const char *line, int *len_p)
 490{
 491        int len = *len_p;
 492        while (len && isspace(line[len-1]))
 493                len--;
 494        *len_p = len;
 495        return !len;
 496}
 497
 498static const char *skip_empty_lines(const char *msg)
 499{
 500        for (;;) {
 501                int linelen = get_one_line(msg);
 502                int ll = linelen;
 503                if (!linelen)
 504                        break;
 505                if (!is_empty_line(msg, &ll))
 506                        break;
 507                msg += linelen;
 508        }
 509        return msg;
 510}
 511
 512static void add_merge_info(const struct pretty_print_context *pp,
 513                           struct strbuf *sb, const struct commit *commit)
 514{
 515        struct commit_list *parent = commit->parents;
 516
 517        if ((pp->fmt == CMIT_FMT_ONELINE) || (pp->fmt == CMIT_FMT_EMAIL) ||
 518            !parent || !parent->next)
 519                return;
 520
 521        strbuf_addstr(sb, "Merge:");
 522
 523        while (parent) {
 524                struct commit *p = parent->item;
 525                const char *hex = NULL;
 526                if (pp->abbrev)
 527                        hex = find_unique_abbrev(p->object.sha1, pp->abbrev);
 528                if (!hex)
 529                        hex = sha1_to_hex(p->object.sha1);
 530                parent = parent->next;
 531
 532                strbuf_addf(sb, " %s", hex);
 533        }
 534        strbuf_addch(sb, '\n');
 535}
 536
 537static char *get_header(const struct commit *commit, const char *msg,
 538                        const char *key)
 539{
 540        int key_len = strlen(key);
 541        const char *line = msg;
 542
 543        while (line) {
 544                const char *eol = strchr(line, '\n'), *next;
 545
 546                if (line == eol)
 547                        return NULL;
 548                if (!eol) {
 549                        warning("malformed commit (header is missing newline): %s",
 550                                sha1_to_hex(commit->object.sha1));
 551                        eol = line + strlen(line);
 552                        next = NULL;
 553                } else
 554                        next = eol + 1;
 555                if (eol - line > key_len &&
 556                    !strncmp(line, key, key_len) &&
 557                    line[key_len] == ' ') {
 558                        return xmemdupz(line + key_len + 1, eol - line - key_len - 1);
 559                }
 560                line = next;
 561        }
 562        return NULL;
 563}
 564
 565static char *replace_encoding_header(char *buf, const char *encoding)
 566{
 567        struct strbuf tmp = STRBUF_INIT;
 568        size_t start, len;
 569        char *cp = buf;
 570
 571        /* guess if there is an encoding header before a \n\n */
 572        while (strncmp(cp, "encoding ", strlen("encoding "))) {
 573                cp = strchr(cp, '\n');
 574                if (!cp || *++cp == '\n')
 575                        return buf;
 576        }
 577        start = cp - buf;
 578        cp = strchr(cp, '\n');
 579        if (!cp)
 580                return buf; /* should not happen but be defensive */
 581        len = cp + 1 - (buf + start);
 582
 583        strbuf_attach(&tmp, buf, strlen(buf), strlen(buf) + 1);
 584        if (is_encoding_utf8(encoding)) {
 585                /* we have re-coded to UTF-8; drop the header */
 586                strbuf_remove(&tmp, start, len);
 587        } else {
 588                /* just replaces XXXX in 'encoding XXXX\n' */
 589                strbuf_splice(&tmp, start + strlen("encoding "),
 590                                          len - strlen("encoding \n"),
 591                                          encoding, strlen(encoding));
 592        }
 593        return strbuf_detach(&tmp, NULL);
 594}
 595
 596char *logmsg_reencode(const struct commit *commit,
 597                      char **commit_encoding,
 598                      const char *output_encoding)
 599{
 600        static const char *utf8 = "UTF-8";
 601        const char *use_encoding;
 602        char *encoding;
 603        char *msg = commit->buffer;
 604        char *out;
 605
 606        if (!msg) {
 607                enum object_type type;
 608                unsigned long size;
 609
 610                msg = read_sha1_file(commit->object.sha1, &type, &size);
 611                if (!msg)
 612                        die("Cannot read commit object %s",
 613                            sha1_to_hex(commit->object.sha1));
 614                if (type != OBJ_COMMIT)
 615                        die("Expected commit for '%s', got %s",
 616                            sha1_to_hex(commit->object.sha1), typename(type));
 617        }
 618
 619        if (!output_encoding || !*output_encoding) {
 620                if (commit_encoding)
 621                        *commit_encoding =
 622                                get_header(commit, msg, "encoding");
 623                return msg;
 624        }
 625        encoding = get_header(commit, msg, "encoding");
 626        if (commit_encoding)
 627                *commit_encoding = encoding;
 628        use_encoding = encoding ? encoding : utf8;
 629        if (same_encoding(use_encoding, output_encoding)) {
 630                /*
 631                 * No encoding work to be done. If we have no encoding header
 632                 * at all, then there's nothing to do, and we can return the
 633                 * message verbatim (whether newly allocated or not).
 634                 */
 635                if (!encoding)
 636                        return msg;
 637
 638                /*
 639                 * Otherwise, we still want to munge the encoding header in the
 640                 * result, which will be done by modifying the buffer. If we
 641                 * are using a fresh copy, we can reuse it. But if we are using
 642                 * the cached copy from commit->buffer, we need to duplicate it
 643                 * to avoid munging commit->buffer.
 644                 */
 645                out = msg;
 646                if (out == commit->buffer)
 647                        out = xstrdup(out);
 648        }
 649        else {
 650                /*
 651                 * There's actual encoding work to do. Do the reencoding, which
 652                 * still leaves the header to be replaced in the next step. At
 653                 * this point, we are done with msg. If we allocated a fresh
 654                 * copy, we can free it.
 655                 */
 656                out = reencode_string(msg, output_encoding, use_encoding);
 657                if (out && msg != commit->buffer)
 658                        free(msg);
 659        }
 660
 661        /*
 662         * This replacement actually consumes the buffer we hand it, so we do
 663         * not have to worry about freeing the old "out" here.
 664         */
 665        if (out)
 666                out = replace_encoding_header(out, output_encoding);
 667
 668        if (!commit_encoding)
 669                free(encoding);
 670        /*
 671         * If the re-encoding failed, out might be NULL here; in that
 672         * case we just return the commit message verbatim.
 673         */
 674        return out ? out : msg;
 675}
 676
 677void logmsg_free(char *msg, const struct commit *commit)
 678{
 679        if (msg != commit->buffer)
 680                free(msg);
 681}
 682
 683static int mailmap_name(const char **email, size_t *email_len,
 684                        const char **name, size_t *name_len)
 685{
 686        static struct string_list *mail_map;
 687        if (!mail_map) {
 688                mail_map = xcalloc(1, sizeof(*mail_map));
 689                read_mailmap(mail_map, NULL);
 690        }
 691        return mail_map->nr && map_user(mail_map, email, email_len, name, name_len);
 692}
 693
 694static size_t format_person_part(struct strbuf *sb, char part,
 695                                 const char *msg, int len, enum date_mode dmode)
 696{
 697        /* currently all placeholders have same length */
 698        const int placeholder_len = 2;
 699        int tz;
 700        unsigned long date = 0;
 701        struct ident_split s;
 702        const char *name, *mail;
 703        size_t maillen, namelen;
 704
 705        if (split_ident_line(&s, msg, len) < 0)
 706                goto skip;
 707
 708        name = s.name_begin;
 709        namelen = s.name_end - s.name_begin;
 710        mail = s.mail_begin;
 711        maillen = s.mail_end - s.mail_begin;
 712
 713        if (part == 'N' || part == 'E') /* mailmap lookup */
 714                mailmap_name(&mail, &maillen, &name, &namelen);
 715        if (part == 'n' || part == 'N') {       /* name */
 716                strbuf_add(sb, name, namelen);
 717                return placeholder_len;
 718        }
 719        if (part == 'e' || part == 'E') {       /* email */
 720                strbuf_add(sb, mail, maillen);
 721                return placeholder_len;
 722        }
 723
 724        if (!s.date_begin)
 725                goto skip;
 726
 727        date = strtoul(s.date_begin, NULL, 10);
 728
 729        if (part == 't') {      /* date, UNIX timestamp */
 730                strbuf_add(sb, s.date_begin, s.date_end - s.date_begin);
 731                return placeholder_len;
 732        }
 733
 734        /* parse tz */
 735        tz = strtoul(s.tz_begin + 1, NULL, 10);
 736        if (*s.tz_begin == '-')
 737                tz = -tz;
 738
 739        switch (part) {
 740        case 'd':       /* date */
 741                strbuf_addstr(sb, show_date(date, tz, dmode));
 742                return placeholder_len;
 743        case 'D':       /* date, RFC2822 style */
 744                strbuf_addstr(sb, show_date(date, tz, DATE_RFC2822));
 745                return placeholder_len;
 746        case 'r':       /* date, relative */
 747                strbuf_addstr(sb, show_date(date, tz, DATE_RELATIVE));
 748                return placeholder_len;
 749        case 'i':       /* date, ISO 8601 */
 750                strbuf_addstr(sb, show_date(date, tz, DATE_ISO8601));
 751                return placeholder_len;
 752        }
 753
 754skip:
 755        /*
 756         * reading from either a bogus commit, or a reflog entry with
 757         * %gn, %ge, etc.; 'sb' cannot be updated, but we still need
 758         * to compute a valid return value.
 759         */
 760        if (part == 'n' || part == 'e' || part == 't' || part == 'd'
 761            || part == 'D' || part == 'r' || part == 'i')
 762                return placeholder_len;
 763
 764        return 0; /* unknown placeholder */
 765}
 766
 767struct chunk {
 768        size_t off;
 769        size_t len;
 770};
 771
 772enum flush_type {
 773        no_flush,
 774        flush_right,
 775        flush_left,
 776        flush_both
 777};
 778
 779struct format_commit_context {
 780        const struct commit *commit;
 781        const struct pretty_print_context *pretty_ctx;
 782        unsigned commit_header_parsed:1;
 783        unsigned commit_message_parsed:1;
 784        struct signature_check signature_check;
 785        enum flush_type flush_type;
 786        char *message;
 787        char *commit_encoding;
 788        size_t width, indent1, indent2;
 789        int auto_color;
 790        int padding;
 791
 792        /* These offsets are relative to the start of the commit message. */
 793        struct chunk author;
 794        struct chunk committer;
 795        size_t message_off;
 796        size_t subject_off;
 797        size_t body_off;
 798
 799        /* The following ones are relative to the result struct strbuf. */
 800        struct chunk abbrev_commit_hash;
 801        struct chunk abbrev_tree_hash;
 802        struct chunk abbrev_parent_hashes;
 803        size_t wrap_start;
 804};
 805
 806static int add_again(struct strbuf *sb, struct chunk *chunk)
 807{
 808        if (chunk->len) {
 809                strbuf_adddup(sb, chunk->off, chunk->len);
 810                return 1;
 811        }
 812
 813        /*
 814         * We haven't seen this chunk before.  Our caller is surely
 815         * going to add it the hard way now.  Remember the most likely
 816         * start of the to-be-added chunk: the current end of the
 817         * struct strbuf.
 818         */
 819        chunk->off = sb->len;
 820        return 0;
 821}
 822
 823static void parse_commit_header(struct format_commit_context *context)
 824{
 825        const char *msg = context->message;
 826        int i;
 827
 828        for (i = 0; msg[i]; i++) {
 829                int eol;
 830                for (eol = i; msg[eol] && msg[eol] != '\n'; eol++)
 831                        ; /* do nothing */
 832
 833                if (i == eol) {
 834                        break;
 835                } else if (!prefixcmp(msg + i, "author ")) {
 836                        context->author.off = i + 7;
 837                        context->author.len = eol - i - 7;
 838                } else if (!prefixcmp(msg + i, "committer ")) {
 839                        context->committer.off = i + 10;
 840                        context->committer.len = eol - i - 10;
 841                }
 842                i = eol;
 843        }
 844        context->message_off = i;
 845        context->commit_header_parsed = 1;
 846}
 847
 848static int istitlechar(char c)
 849{
 850        return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') ||
 851                (c >= '0' && c <= '9') || c == '.' || c == '_';
 852}
 853
 854static void format_sanitized_subject(struct strbuf *sb, const char *msg)
 855{
 856        size_t trimlen;
 857        size_t start_len = sb->len;
 858        int space = 2;
 859
 860        for (; *msg && *msg != '\n'; msg++) {
 861                if (istitlechar(*msg)) {
 862                        if (space == 1)
 863                                strbuf_addch(sb, '-');
 864                        space = 0;
 865                        strbuf_addch(sb, *msg);
 866                        if (*msg == '.')
 867                                while (*(msg+1) == '.')
 868                                        msg++;
 869                } else
 870                        space |= 1;
 871        }
 872
 873        /* trim any trailing '.' or '-' characters */
 874        trimlen = 0;
 875        while (sb->len - trimlen > start_len &&
 876                (sb->buf[sb->len - 1 - trimlen] == '.'
 877                || sb->buf[sb->len - 1 - trimlen] == '-'))
 878                trimlen++;
 879        strbuf_remove(sb, sb->len - trimlen, trimlen);
 880}
 881
 882const char *format_subject(struct strbuf *sb, const char *msg,
 883                           const char *line_separator)
 884{
 885        int first = 1;
 886
 887        for (;;) {
 888                const char *line = msg;
 889                int linelen = get_one_line(line);
 890
 891                msg += linelen;
 892                if (!linelen || is_empty_line(line, &linelen))
 893                        break;
 894
 895                if (!sb)
 896                        continue;
 897                strbuf_grow(sb, linelen + 2);
 898                if (!first)
 899                        strbuf_addstr(sb, line_separator);
 900                strbuf_add(sb, line, linelen);
 901                first = 0;
 902        }
 903        return msg;
 904}
 905
 906static void parse_commit_message(struct format_commit_context *c)
 907{
 908        const char *msg = c->message + c->message_off;
 909        const char *start = c->message;
 910
 911        msg = skip_empty_lines(msg);
 912        c->subject_off = msg - start;
 913
 914        msg = format_subject(NULL, msg, NULL);
 915        msg = skip_empty_lines(msg);
 916        c->body_off = msg - start;
 917
 918        c->commit_message_parsed = 1;
 919}
 920
 921static void strbuf_wrap(struct strbuf *sb, size_t pos,
 922                        size_t width, size_t indent1, size_t indent2)
 923{
 924        struct strbuf tmp = STRBUF_INIT;
 925
 926        if (pos)
 927                strbuf_add(&tmp, sb->buf, pos);
 928        strbuf_add_wrapped_text(&tmp, sb->buf + pos,
 929                                (int) indent1, (int) indent2, (int) width);
 930        strbuf_swap(&tmp, sb);
 931        strbuf_release(&tmp);
 932}
 933
 934static void rewrap_message_tail(struct strbuf *sb,
 935                                struct format_commit_context *c,
 936                                size_t new_width, size_t new_indent1,
 937                                size_t new_indent2)
 938{
 939        if (c->width == new_width && c->indent1 == new_indent1 &&
 940            c->indent2 == new_indent2)
 941                return;
 942        if (c->wrap_start < sb->len)
 943                strbuf_wrap(sb, c->wrap_start, c->width, c->indent1, c->indent2);
 944        c->wrap_start = sb->len;
 945        c->width = new_width;
 946        c->indent1 = new_indent1;
 947        c->indent2 = new_indent2;
 948}
 949
 950static int format_reflog_person(struct strbuf *sb,
 951                                char part,
 952                                struct reflog_walk_info *log,
 953                                enum date_mode dmode)
 954{
 955        const char *ident;
 956
 957        if (!log)
 958                return 2;
 959
 960        ident = get_reflog_ident(log);
 961        if (!ident)
 962                return 2;
 963
 964        return format_person_part(sb, part, ident, strlen(ident), dmode);
 965}
 966
 967static size_t parse_color(struct strbuf *sb, /* in UTF-8 */
 968                          const char *placeholder,
 969                          struct format_commit_context *c)
 970{
 971        if (placeholder[1] == '(') {
 972                const char *begin = placeholder + 2;
 973                const char *end = strchr(begin, ')');
 974                char color[COLOR_MAXLEN];
 975
 976                if (!end)
 977                        return 0;
 978                if (!prefixcmp(begin, "auto,")) {
 979                        if (!want_color(c->pretty_ctx->color))
 980                                return end - placeholder + 1;
 981                        begin += 5;
 982                }
 983                color_parse_mem(begin,
 984                                end - begin,
 985                                "--pretty format", color);
 986                strbuf_addstr(sb, color);
 987                return end - placeholder + 1;
 988        }
 989        if (!prefixcmp(placeholder + 1, "red")) {
 990                strbuf_addstr(sb, GIT_COLOR_RED);
 991                return 4;
 992        } else if (!prefixcmp(placeholder + 1, "green")) {
 993                strbuf_addstr(sb, GIT_COLOR_GREEN);
 994                return 6;
 995        } else if (!prefixcmp(placeholder + 1, "blue")) {
 996                strbuf_addstr(sb, GIT_COLOR_BLUE);
 997                return 5;
 998        } else if (!prefixcmp(placeholder + 1, "reset")) {
 999                strbuf_addstr(sb, GIT_COLOR_RESET);
1000                return 6;
1001        } else
1002                return 0;
1003}
1004
1005static size_t parse_padding_placeholder(struct strbuf *sb,
1006                                        const char *placeholder,
1007                                        struct format_commit_context *c)
1008{
1009        const char *ch = placeholder;
1010        enum flush_type flush_type;
1011        int to_column = 0;
1012
1013        switch (*ch++) {
1014        case '<':
1015                flush_type = flush_right;
1016                break;
1017        case '>':
1018                if (*ch == '<') {
1019                        flush_type = flush_both;
1020                        ch++;
1021                } else
1022                        flush_type = flush_left;
1023                break;
1024        default:
1025                return 0;
1026        }
1027
1028        /* the next value means "wide enough to that column" */
1029        if (*ch == '|') {
1030                to_column = 1;
1031                ch++;
1032        }
1033
1034        if (*ch == '(') {
1035                const char *start = ch + 1;
1036                const char *end = strchr(start, ')');
1037                char *next;
1038                int width;
1039                if (!end || end == start)
1040                        return 0;
1041                width = strtoul(start, &next, 10);
1042                if (next == start || width == 0)
1043                        return 0;
1044                c->padding = to_column ? -width : width;
1045                c->flush_type = flush_type;
1046                return end - placeholder + 1;
1047        }
1048        return 0;
1049}
1050
1051static size_t format_commit_one(struct strbuf *sb, /* in UTF-8 */
1052                                const char *placeholder,
1053                                void *context)
1054{
1055        struct format_commit_context *c = context;
1056        const struct commit *commit = c->commit;
1057        const char *msg = c->message;
1058        struct commit_list *p;
1059        int h1, h2;
1060
1061        /* these are independent of the commit */
1062        switch (placeholder[0]) {
1063        case 'C':
1064                if (!prefixcmp(placeholder + 1, "(auto)")) {
1065                        c->auto_color = 1;
1066                        return 7; /* consumed 7 bytes, "C(auto)" */
1067                } else {
1068                        int ret = parse_color(sb, placeholder, c);
1069                        if (ret)
1070                                c->auto_color = 0;
1071                        /*
1072                         * Otherwise, we decided to treat %C<unknown>
1073                         * as a literal string, and the previous
1074                         * %C(auto) is still valid.
1075                         */
1076                        return ret;
1077                }
1078        case 'n':               /* newline */
1079                strbuf_addch(sb, '\n');
1080                return 1;
1081        case 'x':
1082                /* %x00 == NUL, %x0a == LF, etc. */
1083                if (0 <= (h1 = hexval_table[0xff & placeholder[1]]) &&
1084                    h1 <= 16 &&
1085                    0 <= (h2 = hexval_table[0xff & placeholder[2]]) &&
1086                    h2 <= 16) {
1087                        strbuf_addch(sb, (h1<<4)|h2);
1088                        return 3;
1089                } else
1090                        return 0;
1091        case 'w':
1092                if (placeholder[1] == '(') {
1093                        unsigned long width = 0, indent1 = 0, indent2 = 0;
1094                        char *next;
1095                        const char *start = placeholder + 2;
1096                        const char *end = strchr(start, ')');
1097                        if (!end)
1098                                return 0;
1099                        if (end > start) {
1100                                width = strtoul(start, &next, 10);
1101                                if (*next == ',') {
1102                                        indent1 = strtoul(next + 1, &next, 10);
1103                                        if (*next == ',') {
1104                                                indent2 = strtoul(next + 1,
1105                                                                 &next, 10);
1106                                        }
1107                                }
1108                                if (*next != ')')
1109                                        return 0;
1110                        }
1111                        rewrap_message_tail(sb, c, width, indent1, indent2);
1112                        return end - placeholder + 1;
1113                } else
1114                        return 0;
1115
1116        case '<':
1117        case '>':
1118                return parse_padding_placeholder(sb, placeholder, c);
1119        }
1120
1121        /* these depend on the commit */
1122        if (!commit->object.parsed)
1123                parse_object(commit->object.sha1);
1124
1125        switch (placeholder[0]) {
1126        case 'H':               /* commit hash */
1127                strbuf_addstr(sb, diff_get_color(c->auto_color, DIFF_COMMIT));
1128                strbuf_addstr(sb, sha1_to_hex(commit->object.sha1));
1129                strbuf_addstr(sb, diff_get_color(c->auto_color, DIFF_RESET));
1130                return 1;
1131        case 'h':               /* abbreviated commit hash */
1132                strbuf_addstr(sb, diff_get_color(c->auto_color, DIFF_COMMIT));
1133                if (add_again(sb, &c->abbrev_commit_hash)) {
1134                        strbuf_addstr(sb, diff_get_color(c->auto_color, DIFF_RESET));
1135                        return 1;
1136                }
1137                strbuf_addstr(sb, find_unique_abbrev(commit->object.sha1,
1138                                                     c->pretty_ctx->abbrev));
1139                strbuf_addstr(sb, diff_get_color(c->auto_color, DIFF_RESET));
1140                c->abbrev_commit_hash.len = sb->len - c->abbrev_commit_hash.off;
1141                return 1;
1142        case 'T':               /* tree hash */
1143                strbuf_addstr(sb, sha1_to_hex(commit->tree->object.sha1));
1144                return 1;
1145        case 't':               /* abbreviated tree hash */
1146                if (add_again(sb, &c->abbrev_tree_hash))
1147                        return 1;
1148                strbuf_addstr(sb, find_unique_abbrev(commit->tree->object.sha1,
1149                                                     c->pretty_ctx->abbrev));
1150                c->abbrev_tree_hash.len = sb->len - c->abbrev_tree_hash.off;
1151                return 1;
1152        case 'P':               /* parent hashes */
1153                for (p = commit->parents; p; p = p->next) {
1154                        if (p != commit->parents)
1155                                strbuf_addch(sb, ' ');
1156                        strbuf_addstr(sb, sha1_to_hex(p->item->object.sha1));
1157                }
1158                return 1;
1159        case 'p':               /* abbreviated parent hashes */
1160                if (add_again(sb, &c->abbrev_parent_hashes))
1161                        return 1;
1162                for (p = commit->parents; p; p = p->next) {
1163                        if (p != commit->parents)
1164                                strbuf_addch(sb, ' ');
1165                        strbuf_addstr(sb, find_unique_abbrev(
1166                                        p->item->object.sha1,
1167                                        c->pretty_ctx->abbrev));
1168                }
1169                c->abbrev_parent_hashes.len = sb->len -
1170                                              c->abbrev_parent_hashes.off;
1171                return 1;
1172        case 'm':               /* left/right/bottom */
1173                strbuf_addstr(sb, get_revision_mark(NULL, commit));
1174                return 1;
1175        case 'd':
1176                load_ref_decorations(DECORATE_SHORT_REFS);
1177                format_decorations(sb, commit, c->auto_color);
1178                return 1;
1179        case 'g':               /* reflog info */
1180                switch(placeholder[1]) {
1181                case 'd':       /* reflog selector */
1182                case 'D':
1183                        if (c->pretty_ctx->reflog_info)
1184                                get_reflog_selector(sb,
1185                                                    c->pretty_ctx->reflog_info,
1186                                                    c->pretty_ctx->date_mode,
1187                                                    c->pretty_ctx->date_mode_explicit,
1188                                                    (placeholder[1] == 'd'));
1189                        return 2;
1190                case 's':       /* reflog message */
1191                        if (c->pretty_ctx->reflog_info)
1192                                get_reflog_message(sb, c->pretty_ctx->reflog_info);
1193                        return 2;
1194                case 'n':
1195                case 'N':
1196                case 'e':
1197                case 'E':
1198                        return format_reflog_person(sb,
1199                                                    placeholder[1],
1200                                                    c->pretty_ctx->reflog_info,
1201                                                    c->pretty_ctx->date_mode);
1202                }
1203                return 0;       /* unknown %g placeholder */
1204        case 'N':
1205                if (c->pretty_ctx->notes_message) {
1206                        strbuf_addstr(sb, c->pretty_ctx->notes_message);
1207                        return 1;
1208                }
1209                return 0;
1210        }
1211
1212        if (placeholder[0] == 'G') {
1213                if (!c->signature_check.result)
1214                        check_commit_signature(c->commit, &(c->signature_check));
1215                switch (placeholder[1]) {
1216                case 'G':
1217                        if (c->signature_check.gpg_output)
1218                                strbuf_addstr(sb, c->signature_check.gpg_output);
1219                        break;
1220                case '?':
1221                        switch (c->signature_check.result) {
1222                        case 'G':
1223                        case 'B':
1224                        case 'U':
1225                        case 'N':
1226                                strbuf_addch(sb, c->signature_check.result);
1227                        }
1228                        break;
1229                case 'S':
1230                        if (c->signature_check.signer)
1231                                strbuf_addstr(sb, c->signature_check.signer);
1232                        break;
1233                case 'K':
1234                        if (c->signature_check.key)
1235                                strbuf_addstr(sb, c->signature_check.key);
1236                        break;
1237                }
1238                return 2;
1239        }
1240
1241
1242        /* For the rest we have to parse the commit header. */
1243        if (!c->commit_header_parsed)
1244                parse_commit_header(c);
1245
1246        switch (placeholder[0]) {
1247        case 'a':       /* author ... */
1248                return format_person_part(sb, placeholder[1],
1249                                   msg + c->author.off, c->author.len,
1250                                   c->pretty_ctx->date_mode);
1251        case 'c':       /* committer ... */
1252                return format_person_part(sb, placeholder[1],
1253                                   msg + c->committer.off, c->committer.len,
1254                                   c->pretty_ctx->date_mode);
1255        case 'e':       /* encoding */
1256                if (c->commit_encoding)
1257                        strbuf_addstr(sb, c->commit_encoding);
1258                return 1;
1259        case 'B':       /* raw body */
1260                /* message_off is always left at the initial newline */
1261                strbuf_addstr(sb, msg + c->message_off + 1);
1262                return 1;
1263        }
1264
1265        /* Now we need to parse the commit message. */
1266        if (!c->commit_message_parsed)
1267                parse_commit_message(c);
1268
1269        switch (placeholder[0]) {
1270        case 's':       /* subject */
1271                format_subject(sb, msg + c->subject_off, " ");
1272                return 1;
1273        case 'f':       /* sanitized subject */
1274                format_sanitized_subject(sb, msg + c->subject_off);
1275                return 1;
1276        case 'b':       /* body */
1277                strbuf_addstr(sb, msg + c->body_off);
1278                return 1;
1279        }
1280        return 0;       /* unknown placeholder */
1281}
1282
1283static size_t format_and_pad_commit(struct strbuf *sb, /* in UTF-8 */
1284                                    const char *placeholder,
1285                                    struct format_commit_context *c)
1286{
1287        struct strbuf local_sb = STRBUF_INIT;
1288        int total_consumed = 0, len, padding = c->padding;
1289        if (padding < 0) {
1290                const char *start = strrchr(sb->buf, '\n');
1291                int occupied;
1292                if (!start)
1293                        start = sb->buf;
1294                occupied = utf8_strnwidth(start, -1, 1);
1295                padding = (-padding) - occupied;
1296        }
1297        while (1) {
1298                int modifier = *placeholder == 'C';
1299                int consumed = format_commit_one(&local_sb, placeholder, c);
1300                total_consumed += consumed;
1301
1302                if (!modifier)
1303                        break;
1304
1305                placeholder += consumed;
1306                if (*placeholder != '%')
1307                        break;
1308                placeholder++;
1309                total_consumed++;
1310        }
1311        len = utf8_strnwidth(local_sb.buf, -1, 1);
1312        if (len > padding)
1313                strbuf_addstr(sb, local_sb.buf);
1314        else {
1315                int sb_len = sb->len, offset = 0;
1316                if (c->flush_type == flush_left)
1317                        offset = padding - len;
1318                else if (c->flush_type == flush_both)
1319                        offset = (padding - len) / 2;
1320                /*
1321                 * we calculate padding in columns, now
1322                 * convert it back to chars
1323                 */
1324                padding = padding - len + local_sb.len;
1325                strbuf_grow(sb, padding);
1326                strbuf_setlen(sb, sb_len + padding);
1327                memset(sb->buf + sb_len, ' ', sb->len - sb_len);
1328                memcpy(sb->buf + sb_len + offset, local_sb.buf,
1329                       local_sb.len);
1330        }
1331        strbuf_release(&local_sb);
1332        c->flush_type = no_flush;
1333        return total_consumed;
1334}
1335
1336static size_t format_commit_item(struct strbuf *sb, /* in UTF-8 */
1337                                 const char *placeholder,
1338                                 void *context)
1339{
1340        int consumed;
1341        size_t orig_len;
1342        enum {
1343                NO_MAGIC,
1344                ADD_LF_BEFORE_NON_EMPTY,
1345                DEL_LF_BEFORE_EMPTY,
1346                ADD_SP_BEFORE_NON_EMPTY
1347        } magic = NO_MAGIC;
1348
1349        switch (placeholder[0]) {
1350        case '-':
1351                magic = DEL_LF_BEFORE_EMPTY;
1352                break;
1353        case '+':
1354                magic = ADD_LF_BEFORE_NON_EMPTY;
1355                break;
1356        case ' ':
1357                magic = ADD_SP_BEFORE_NON_EMPTY;
1358                break;
1359        default:
1360                break;
1361        }
1362        if (magic != NO_MAGIC)
1363                placeholder++;
1364
1365        orig_len = sb->len;
1366        if (((struct format_commit_context *)context)->flush_type != no_flush)
1367                consumed = format_and_pad_commit(sb, placeholder, context);
1368        else
1369                consumed = format_commit_one(sb, placeholder, context);
1370        if (magic == NO_MAGIC)
1371                return consumed;
1372
1373        if ((orig_len == sb->len) && magic == DEL_LF_BEFORE_EMPTY) {
1374                while (sb->len && sb->buf[sb->len - 1] == '\n')
1375                        strbuf_setlen(sb, sb->len - 1);
1376        } else if (orig_len != sb->len) {
1377                if (magic == ADD_LF_BEFORE_NON_EMPTY)
1378                        strbuf_insert(sb, orig_len, "\n", 1);
1379                else if (magic == ADD_SP_BEFORE_NON_EMPTY)
1380                        strbuf_insert(sb, orig_len, " ", 1);
1381        }
1382        return consumed + 1;
1383}
1384
1385static size_t userformat_want_item(struct strbuf *sb, const char *placeholder,
1386                                   void *context)
1387{
1388        struct userformat_want *w = context;
1389
1390        if (*placeholder == '+' || *placeholder == '-' || *placeholder == ' ')
1391                placeholder++;
1392
1393        switch (*placeholder) {
1394        case 'N':
1395                w->notes = 1;
1396                break;
1397        }
1398        return 0;
1399}
1400
1401void userformat_find_requirements(const char *fmt, struct userformat_want *w)
1402{
1403        struct strbuf dummy = STRBUF_INIT;
1404
1405        if (!fmt) {
1406                if (!user_format)
1407                        return;
1408                fmt = user_format;
1409        }
1410        strbuf_expand(&dummy, fmt, userformat_want_item, w);
1411        strbuf_release(&dummy);
1412}
1413
1414void format_commit_message(const struct commit *commit,
1415                           const char *format, struct strbuf *sb,
1416                           const struct pretty_print_context *pretty_ctx)
1417{
1418        struct format_commit_context context;
1419        const char *output_enc = pretty_ctx->output_encoding;
1420        const char *utf8 = "UTF-8";
1421
1422        memset(&context, 0, sizeof(context));
1423        context.commit = commit;
1424        context.pretty_ctx = pretty_ctx;
1425        context.wrap_start = sb->len;
1426        context.message = logmsg_reencode(commit,
1427                                          &context.commit_encoding,
1428                                          output_enc);
1429
1430        strbuf_expand(sb, format, format_commit_item, &context);
1431        rewrap_message_tail(sb, &context, 0, 0, 0);
1432
1433        if (output_enc) {
1434                if (same_encoding(utf8, output_enc))
1435                        output_enc = NULL;
1436        } else {
1437                if (context.commit_encoding &&
1438                    !same_encoding(context.commit_encoding, utf8))
1439                        output_enc = context.commit_encoding;
1440        }
1441
1442        if (output_enc) {
1443                int outsz;
1444                char *out = reencode_string_len(sb->buf, sb->len,
1445                                                output_enc, utf8, &outsz);
1446                if (out)
1447                        strbuf_attach(sb, out, outsz, outsz + 1);
1448        }
1449
1450        free(context.commit_encoding);
1451        logmsg_free(context.message, commit);
1452        free(context.signature_check.gpg_output);
1453        free(context.signature_check.signer);
1454}
1455
1456static void pp_header(const struct pretty_print_context *pp,
1457                      const char *encoding,
1458                      const struct commit *commit,
1459                      const char **msg_p,
1460                      struct strbuf *sb)
1461{
1462        int parents_shown = 0;
1463
1464        for (;;) {
1465                const char *line = *msg_p;
1466                int linelen = get_one_line(*msg_p);
1467
1468                if (!linelen)
1469                        return;
1470                *msg_p += linelen;
1471
1472                if (linelen == 1)
1473                        /* End of header */
1474                        return;
1475
1476                if (pp->fmt == CMIT_FMT_RAW) {
1477                        strbuf_add(sb, line, linelen);
1478                        continue;
1479                }
1480
1481                if (!prefixcmp(line, "parent ")) {
1482                        if (linelen != 48)
1483                                die("bad parent line in commit");
1484                        continue;
1485                }
1486
1487                if (!parents_shown) {
1488                        struct commit_list *parent;
1489                        int num;
1490                        for (parent = commit->parents, num = 0;
1491                             parent;
1492                             parent = parent->next, num++)
1493                                ;
1494                        /* with enough slop */
1495                        strbuf_grow(sb, num * 50 + 20);
1496                        add_merge_info(pp, sb, commit);
1497                        parents_shown = 1;
1498                }
1499
1500                /*
1501                 * MEDIUM == DEFAULT shows only author with dates.
1502                 * FULL shows both authors but not dates.
1503                 * FULLER shows both authors and dates.
1504                 */
1505                if (!prefixcmp(line, "author ")) {
1506                        strbuf_grow(sb, linelen + 80);
1507                        pp_user_info(pp, "Author", sb, line + 7, encoding);
1508                }
1509                if (!prefixcmp(line, "committer ") &&
1510                    (pp->fmt == CMIT_FMT_FULL || pp->fmt == CMIT_FMT_FULLER)) {
1511                        strbuf_grow(sb, linelen + 80);
1512                        pp_user_info(pp, "Commit", sb, line + 10, encoding);
1513                }
1514        }
1515}
1516
1517void pp_title_line(const struct pretty_print_context *pp,
1518                   const char **msg_p,
1519                   struct strbuf *sb,
1520                   const char *encoding,
1521                   int need_8bit_cte)
1522{
1523        static const int max_length = 78; /* per rfc2047 */
1524        struct strbuf title;
1525
1526        strbuf_init(&title, 80);
1527        *msg_p = format_subject(&title, *msg_p,
1528                                pp->preserve_subject ? "\n" : " ");
1529
1530        strbuf_grow(sb, title.len + 1024);
1531        if (pp->subject) {
1532                strbuf_addstr(sb, pp->subject);
1533                if (needs_rfc2047_encoding(title.buf, title.len, RFC2047_SUBJECT))
1534                        add_rfc2047(sb, title.buf, title.len,
1535                                                encoding, RFC2047_SUBJECT);
1536                else
1537                        strbuf_add_wrapped_bytes(sb, title.buf, title.len,
1538                                         -last_line_length(sb), 1, max_length);
1539        } else {
1540                strbuf_addbuf(sb, &title);
1541        }
1542        strbuf_addch(sb, '\n');
1543
1544        if (need_8bit_cte > 0) {
1545                const char *header_fmt =
1546                        "MIME-Version: 1.0\n"
1547                        "Content-Type: text/plain; charset=%s\n"
1548                        "Content-Transfer-Encoding: 8bit\n";
1549                strbuf_addf(sb, header_fmt, encoding);
1550        }
1551        if (pp->after_subject) {
1552                strbuf_addstr(sb, pp->after_subject);
1553        }
1554        if (pp->fmt == CMIT_FMT_EMAIL) {
1555                strbuf_addch(sb, '\n');
1556        }
1557        strbuf_release(&title);
1558}
1559
1560void pp_remainder(const struct pretty_print_context *pp,
1561                  const char **msg_p,
1562                  struct strbuf *sb,
1563                  int indent)
1564{
1565        int first = 1;
1566        for (;;) {
1567                const char *line = *msg_p;
1568                int linelen = get_one_line(line);
1569                *msg_p += linelen;
1570
1571                if (!linelen)
1572                        break;
1573
1574                if (is_empty_line(line, &linelen)) {
1575                        if (first)
1576                                continue;
1577                        if (pp->fmt == CMIT_FMT_SHORT)
1578                                break;
1579                }
1580                first = 0;
1581
1582                strbuf_grow(sb, linelen + indent + 20);
1583                if (indent) {
1584                        memset(sb->buf + sb->len, ' ', indent);
1585                        strbuf_setlen(sb, sb->len + indent);
1586                }
1587                strbuf_add(sb, line, linelen);
1588                strbuf_addch(sb, '\n');
1589        }
1590}
1591
1592void pretty_print_commit(const struct pretty_print_context *pp,
1593                         const struct commit *commit,
1594                         struct strbuf *sb)
1595{
1596        unsigned long beginning_of_body;
1597        int indent = 4;
1598        const char *msg;
1599        char *reencoded;
1600        const char *encoding;
1601        int need_8bit_cte = pp->need_8bit_cte;
1602
1603        if (pp->fmt == CMIT_FMT_USERFORMAT) {
1604                format_commit_message(commit, user_format, sb, pp);
1605                return;
1606        }
1607
1608        encoding = get_log_output_encoding();
1609        msg = reencoded = logmsg_reencode(commit, NULL, encoding);
1610
1611        if (pp->fmt == CMIT_FMT_ONELINE || pp->fmt == CMIT_FMT_EMAIL)
1612                indent = 0;
1613
1614        /*
1615         * We need to check and emit Content-type: to mark it
1616         * as 8-bit if we haven't done so.
1617         */
1618        if (pp->fmt == CMIT_FMT_EMAIL && need_8bit_cte == 0) {
1619                int i, ch, in_body;
1620
1621                for (in_body = i = 0; (ch = msg[i]); i++) {
1622                        if (!in_body) {
1623                                /* author could be non 7-bit ASCII but
1624                                 * the log may be so; skip over the
1625                                 * header part first.
1626                                 */
1627                                if (ch == '\n' && msg[i+1] == '\n')
1628                                        in_body = 1;
1629                        }
1630                        else if (non_ascii(ch)) {
1631                                need_8bit_cte = 1;
1632                                break;
1633                        }
1634                }
1635        }
1636
1637        pp_header(pp, encoding, commit, &msg, sb);
1638        if (pp->fmt != CMIT_FMT_ONELINE && !pp->subject) {
1639                strbuf_addch(sb, '\n');
1640        }
1641
1642        /* Skip excess blank lines at the beginning of body, if any... */
1643        msg = skip_empty_lines(msg);
1644
1645        /* These formats treat the title line specially. */
1646        if (pp->fmt == CMIT_FMT_ONELINE || pp->fmt == CMIT_FMT_EMAIL)
1647                pp_title_line(pp, &msg, sb, encoding, need_8bit_cte);
1648
1649        beginning_of_body = sb->len;
1650        if (pp->fmt != CMIT_FMT_ONELINE)
1651                pp_remainder(pp, &msg, sb, indent);
1652        strbuf_rtrim(sb);
1653
1654        /* Make sure there is an EOLN for the non-oneline case */
1655        if (pp->fmt != CMIT_FMT_ONELINE)
1656                strbuf_addch(sb, '\n');
1657
1658        /*
1659         * The caller may append additional body text in e-mail
1660         * format.  Make sure we did not strip the blank line
1661         * between the header and the body.
1662         */
1663        if (pp->fmt == CMIT_FMT_EMAIL && sb->len <= beginning_of_body)
1664                strbuf_addch(sb, '\n');
1665
1666        logmsg_free(reencoded, commit);
1667}
1668
1669void pp_commit_easy(enum cmit_fmt fmt, const struct commit *commit,
1670                    struct strbuf *sb)
1671{
1672        struct pretty_print_context pp = {0};
1673        pp.fmt = fmt;
1674        pretty_print_commit(&pp, commit, sb);
1675}