pretty.con commit Merge branch 'lf/bundle-exclusion' (7b41640)
   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
  27int commit_format_is_empty(enum cmit_fmt fmt)
  28{
  29        return fmt == CMIT_FMT_USERFORMAT && !*user_format;
  30}
  31
  32static void save_user_format(struct rev_info *rev, const char *cp, int is_tformat)
  33{
  34        free(user_format);
  35        user_format = xstrdup(cp);
  36        if (is_tformat)
  37                rev->use_terminator = 1;
  38        rev->commit_format = CMIT_FMT_USERFORMAT;
  39}
  40
  41static int git_pretty_formats_config(const char *var, const char *value, void *cb)
  42{
  43        struct cmt_fmt_map *commit_format = NULL;
  44        const char *name;
  45        const char *fmt;
  46        int i;
  47
  48        if (!skip_prefix(var, "pretty.", &name))
  49                return 0;
  50
  51        for (i = 0; i < builtin_formats_len; i++) {
  52                if (!strcmp(commit_formats[i].name, name))
  53                        return 0;
  54        }
  55
  56        for (i = builtin_formats_len; i < commit_formats_len; i++) {
  57                if (!strcmp(commit_formats[i].name, name)) {
  58                        commit_format = &commit_formats[i];
  59                        break;
  60                }
  61        }
  62
  63        if (!commit_format) {
  64                ALLOC_GROW(commit_formats, commit_formats_len+1,
  65                           commit_formats_alloc);
  66                commit_format = &commit_formats[commit_formats_len];
  67                memset(commit_format, 0, sizeof(*commit_format));
  68                commit_formats_len++;
  69        }
  70
  71        commit_format->name = xstrdup(name);
  72        commit_format->format = CMIT_FMT_USERFORMAT;
  73        if (git_config_string(&fmt, var, value))
  74                return -1;
  75
  76        if (starts_with(fmt, "format:") || starts_with(fmt, "tformat:")) {
  77                commit_format->is_tformat = fmt[0] == 't';
  78                fmt = strchr(fmt, ':') + 1;
  79        } else if (strchr(fmt, '%'))
  80                commit_format->is_tformat = 1;
  81        else
  82                commit_format->is_alias = 1;
  83        commit_format->user_format = fmt;
  84
  85        return 0;
  86}
  87
  88static void setup_commit_formats(void)
  89{
  90        struct cmt_fmt_map builtin_formats[] = {
  91                { "raw",        CMIT_FMT_RAW,           0 },
  92                { "medium",     CMIT_FMT_MEDIUM,        0 },
  93                { "short",      CMIT_FMT_SHORT,         0 },
  94                { "email",      CMIT_FMT_EMAIL,         0 },
  95                { "fuller",     CMIT_FMT_FULLER,        0 },
  96                { "full",       CMIT_FMT_FULL,          0 },
  97                { "oneline",    CMIT_FMT_ONELINE,       1 }
  98        };
  99        commit_formats_len = ARRAY_SIZE(builtin_formats);
 100        builtin_formats_len = commit_formats_len;
 101        ALLOC_GROW(commit_formats, commit_formats_len, commit_formats_alloc);
 102        memcpy(commit_formats, builtin_formats,
 103               sizeof(*builtin_formats)*ARRAY_SIZE(builtin_formats));
 104
 105        git_config(git_pretty_formats_config, NULL);
 106}
 107
 108static struct cmt_fmt_map *find_commit_format_recursive(const char *sought,
 109                                                        const char *original,
 110                                                        int num_redirections)
 111{
 112        struct cmt_fmt_map *found = NULL;
 113        size_t found_match_len = 0;
 114        int i;
 115
 116        if (num_redirections >= commit_formats_len)
 117                die("invalid --pretty format: "
 118                    "'%s' references an alias which points to itself",
 119                    original);
 120
 121        for (i = 0; i < commit_formats_len; i++) {
 122                size_t match_len;
 123
 124                if (!starts_with(commit_formats[i].name, sought))
 125                        continue;
 126
 127                match_len = strlen(commit_formats[i].name);
 128                if (found == NULL || found_match_len > match_len) {
 129                        found = &commit_formats[i];
 130                        found_match_len = match_len;
 131                }
 132        }
 133
 134        if (found && found->is_alias) {
 135                found = find_commit_format_recursive(found->user_format,
 136                                                     original,
 137                                                     num_redirections+1);
 138        }
 139
 140        return found;
 141}
 142
 143static struct cmt_fmt_map *find_commit_format(const char *sought)
 144{
 145        if (!commit_formats)
 146                setup_commit_formats();
 147
 148        return find_commit_format_recursive(sought, sought, 0);
 149}
 150
 151void get_commit_format(const char *arg, struct rev_info *rev)
 152{
 153        struct cmt_fmt_map *commit_format;
 154
 155        rev->use_terminator = 0;
 156        if (!arg) {
 157                rev->commit_format = CMIT_FMT_DEFAULT;
 158                return;
 159        }
 160        if (starts_with(arg, "format:") || starts_with(arg, "tformat:")) {
 161                save_user_format(rev, strchr(arg, ':') + 1, arg[0] == 't');
 162                return;
 163        }
 164
 165        if (!*arg || strchr(arg, '%')) {
 166                save_user_format(rev, arg, 1);
 167                return;
 168        }
 169
 170        commit_format = find_commit_format(arg);
 171        if (!commit_format)
 172                die("invalid --pretty format: %s", arg);
 173
 174        rev->commit_format = commit_format->format;
 175        rev->use_terminator = commit_format->is_tformat;
 176        if (commit_format->format == CMIT_FMT_USERFORMAT) {
 177                save_user_format(rev, commit_format->user_format,
 178                                 commit_format->is_tformat);
 179        }
 180}
 181
 182/*
 183 * Generic support for pretty-printing the header
 184 */
 185static int get_one_line(const char *msg)
 186{
 187        int ret = 0;
 188
 189        for (;;) {
 190                char c = *msg++;
 191                if (!c)
 192                        break;
 193                ret++;
 194                if (c == '\n')
 195                        break;
 196        }
 197        return ret;
 198}
 199
 200/* High bit set, or ISO-2022-INT */
 201static int non_ascii(int ch)
 202{
 203        return !isascii(ch) || ch == '\033';
 204}
 205
 206int has_non_ascii(const char *s)
 207{
 208        int ch;
 209        if (!s)
 210                return 0;
 211        while ((ch = *s++) != '\0') {
 212                if (non_ascii(ch))
 213                        return 1;
 214        }
 215        return 0;
 216}
 217
 218static int is_rfc822_special(char ch)
 219{
 220        switch (ch) {
 221        case '(':
 222        case ')':
 223        case '<':
 224        case '>':
 225        case '[':
 226        case ']':
 227        case ':':
 228        case ';':
 229        case '@':
 230        case ',':
 231        case '.':
 232        case '"':
 233        case '\\':
 234                return 1;
 235        default:
 236                return 0;
 237        }
 238}
 239
 240static int needs_rfc822_quoting(const char *s, int len)
 241{
 242        int i;
 243        for (i = 0; i < len; i++)
 244                if (is_rfc822_special(s[i]))
 245                        return 1;
 246        return 0;
 247}
 248
 249static int last_line_length(struct strbuf *sb)
 250{
 251        int i;
 252
 253        /* How many bytes are already used on the last line? */
 254        for (i = sb->len - 1; i >= 0; i--)
 255                if (sb->buf[i] == '\n')
 256                        break;
 257        return sb->len - (i + 1);
 258}
 259
 260static void add_rfc822_quoted(struct strbuf *out, const char *s, int len)
 261{
 262        int i;
 263
 264        /* just a guess, we may have to also backslash-quote */
 265        strbuf_grow(out, len + 2);
 266
 267        strbuf_addch(out, '"');
 268        for (i = 0; i < len; i++) {
 269                switch (s[i]) {
 270                case '"':
 271                case '\\':
 272                        strbuf_addch(out, '\\');
 273                        /* fall through */
 274                default:
 275                        strbuf_addch(out, s[i]);
 276                }
 277        }
 278        strbuf_addch(out, '"');
 279}
 280
 281enum rfc2047_type {
 282        RFC2047_SUBJECT,
 283        RFC2047_ADDRESS
 284};
 285
 286static int is_rfc2047_special(char ch, enum rfc2047_type type)
 287{
 288        /*
 289         * rfc2047, section 4.2:
 290         *
 291         *    8-bit values which correspond to printable ASCII characters other
 292         *    than "=", "?", and "_" (underscore), MAY be represented as those
 293         *    characters.  (But see section 5 for restrictions.)  In
 294         *    particular, SPACE and TAB MUST NOT be represented as themselves
 295         *    within encoded words.
 296         */
 297
 298        /*
 299         * rule out non-ASCII characters and non-printable characters (the
 300         * non-ASCII check should be redundant as isprint() is not localized
 301         * and only knows about ASCII, but be defensive about that)
 302         */
 303        if (non_ascii(ch) || !isprint(ch))
 304                return 1;
 305
 306        /*
 307         * rule out special printable characters (' ' should be the only
 308         * whitespace character considered printable, but be defensive and use
 309         * isspace())
 310         */
 311        if (isspace(ch) || ch == '=' || ch == '?' || ch == '_')
 312                return 1;
 313
 314        /*
 315         * rfc2047, section 5.3:
 316         *
 317         *    As a replacement for a 'word' entity within a 'phrase', for example,
 318         *    one that precedes an address in a From, To, or Cc header.  The ABNF
 319         *    definition for 'phrase' from RFC 822 thus becomes:
 320         *
 321         *    phrase = 1*( encoded-word / word )
 322         *
 323         *    In this case the set of characters that may be used in a "Q"-encoded
 324         *    'encoded-word' is restricted to: <upper and lower case ASCII
 325         *    letters, decimal digits, "!", "*", "+", "-", "/", "=", and "_"
 326         *    (underscore, ASCII 95.)>.  An 'encoded-word' that appears within a
 327         *    'phrase' MUST be separated from any adjacent 'word', 'text' or
 328         *    'special' by 'linear-white-space'.
 329         */
 330
 331        if (type != RFC2047_ADDRESS)
 332                return 0;
 333
 334        /* '=' and '_' are special cases and have been checked above */
 335        return !(isalnum(ch) || ch == '!' || ch == '*' || ch == '+' || ch == '-' || ch == '/');
 336}
 337
 338static int needs_rfc2047_encoding(const char *line, int len,
 339                                  enum rfc2047_type type)
 340{
 341        int i;
 342
 343        for (i = 0; i < len; i++) {
 344                int ch = line[i];
 345                if (non_ascii(ch) || ch == '\n')
 346                        return 1;
 347                if ((i + 1 < len) && (ch == '=' && line[i+1] == '?'))
 348                        return 1;
 349        }
 350
 351        return 0;
 352}
 353
 354static void add_rfc2047(struct strbuf *sb, const char *line, size_t len,
 355                       const char *encoding, enum rfc2047_type type)
 356{
 357        static const int max_encoded_length = 76; /* per rfc2047 */
 358        int i;
 359        int line_len = last_line_length(sb);
 360
 361        strbuf_grow(sb, len * 3 + strlen(encoding) + 100);
 362        strbuf_addf(sb, "=?%s?q?", encoding);
 363        line_len += strlen(encoding) + 5; /* 5 for =??q? */
 364
 365        while (len) {
 366                /*
 367                 * RFC 2047, section 5 (3):
 368                 *
 369                 * Each 'encoded-word' MUST represent an integral number of
 370                 * characters.  A multi-octet character may not be split across
 371                 * adjacent 'encoded- word's.
 372                 */
 373                const unsigned char *p = (const unsigned char *)line;
 374                int chrlen = mbs_chrlen(&line, &len, encoding);
 375                int is_special = (chrlen > 1) || is_rfc2047_special(*p, type);
 376
 377                /* "=%02X" * chrlen, or the byte itself */
 378                const char *encoded_fmt = is_special ? "=%02X"    : "%c";
 379                int         encoded_len = is_special ? 3 * chrlen : 1;
 380
 381                /*
 382                 * According to RFC 2047, we could encode the special character
 383                 * ' ' (space) with '_' (underscore) for readability. But many
 384                 * programs do not understand this and just leave the
 385                 * underscore in place. Thus, we do nothing special here, which
 386                 * causes ' ' to be encoded as '=20', avoiding this problem.
 387                 */
 388
 389                if (line_len + encoded_len + 2 > max_encoded_length) {
 390                        /* It won't fit with trailing "?=" --- break the line */
 391                        strbuf_addf(sb, "?=\n =?%s?q?", encoding);
 392                        line_len = strlen(encoding) + 5 + 1; /* =??q? plus SP */
 393                }
 394
 395                for (i = 0; i < chrlen; i++)
 396                        strbuf_addf(sb, encoded_fmt, p[i]);
 397                line_len += encoded_len;
 398        }
 399        strbuf_addstr(sb, "?=");
 400}
 401
 402const char *show_ident_date(const struct ident_split *ident,
 403                            enum date_mode mode)
 404{
 405        unsigned long date = 0;
 406        long tz = 0;
 407
 408        if (ident->date_begin && ident->date_end)
 409                date = strtoul(ident->date_begin, NULL, 10);
 410        if (date_overflows(date))
 411                date = 0;
 412        else {
 413                if (ident->tz_begin && ident->tz_end)
 414                        tz = strtol(ident->tz_begin, NULL, 10);
 415                if (tz >= INT_MAX || tz <= INT_MIN)
 416                        tz = 0;
 417        }
 418        return show_date(date, tz, mode);
 419}
 420
 421void pp_user_info(struct pretty_print_context *pp,
 422                  const char *what, struct strbuf *sb,
 423                  const char *line, const char *encoding)
 424{
 425        struct ident_split ident;
 426        char *line_end;
 427        const char *mailbuf, *namebuf;
 428        size_t namelen, maillen;
 429        int max_length = 78; /* per rfc2822 */
 430
 431        if (pp->fmt == CMIT_FMT_ONELINE)
 432                return;
 433
 434        line_end = strchrnul(line, '\n');
 435        if (split_ident_line(&ident, line, line_end - line))
 436                return;
 437
 438        mailbuf = ident.mail_begin;
 439        maillen = ident.mail_end - ident.mail_begin;
 440        namebuf = ident.name_begin;
 441        namelen = ident.name_end - ident.name_begin;
 442
 443        if (pp->mailmap)
 444                map_user(pp->mailmap, &mailbuf, &maillen, &namebuf, &namelen);
 445
 446        if (pp->fmt == CMIT_FMT_EMAIL) {
 447                if (pp->from_ident && ident_cmp(pp->from_ident, &ident)) {
 448                        struct strbuf buf = STRBUF_INIT;
 449
 450                        strbuf_addstr(&buf, "From: ");
 451                        strbuf_add(&buf, namebuf, namelen);
 452                        strbuf_addstr(&buf, " <");
 453                        strbuf_add(&buf, mailbuf, maillen);
 454                        strbuf_addstr(&buf, ">\n");
 455                        string_list_append(&pp->in_body_headers,
 456                                           strbuf_detach(&buf, NULL));
 457
 458                        mailbuf = pp->from_ident->mail_begin;
 459                        maillen = pp->from_ident->mail_end - mailbuf;
 460                        namebuf = pp->from_ident->name_begin;
 461                        namelen = pp->from_ident->name_end - namebuf;
 462                }
 463
 464                strbuf_addstr(sb, "From: ");
 465                if (needs_rfc2047_encoding(namebuf, namelen, RFC2047_ADDRESS)) {
 466                        add_rfc2047(sb, namebuf, namelen,
 467                                    encoding, RFC2047_ADDRESS);
 468                        max_length = 76; /* per rfc2047 */
 469                } else if (needs_rfc822_quoting(namebuf, namelen)) {
 470                        struct strbuf quoted = STRBUF_INIT;
 471                        add_rfc822_quoted(&quoted, namebuf, namelen);
 472                        strbuf_add_wrapped_bytes(sb, quoted.buf, quoted.len,
 473                                                        -6, 1, max_length);
 474                        strbuf_release(&quoted);
 475                } else {
 476                        strbuf_add_wrapped_bytes(sb, namebuf, namelen,
 477                                                 -6, 1, max_length);
 478                }
 479
 480                if (max_length <
 481                    last_line_length(sb) + strlen(" <") + maillen + strlen(">"))
 482                        strbuf_addch(sb, '\n');
 483                strbuf_addf(sb, " <%.*s>\n", (int)maillen, mailbuf);
 484        } else {
 485                strbuf_addf(sb, "%s: %.*s%.*s <%.*s>\n", what,
 486                            (pp->fmt == CMIT_FMT_FULLER) ? 4 : 0, "    ",
 487                            (int)namelen, namebuf, (int)maillen, mailbuf);
 488        }
 489
 490        switch (pp->fmt) {
 491        case CMIT_FMT_MEDIUM:
 492                strbuf_addf(sb, "Date:   %s\n",
 493                            show_ident_date(&ident, pp->date_mode));
 494                break;
 495        case CMIT_FMT_EMAIL:
 496                strbuf_addf(sb, "Date: %s\n",
 497                            show_ident_date(&ident, DATE_RFC2822));
 498                break;
 499        case CMIT_FMT_FULLER:
 500                strbuf_addf(sb, "%sDate: %s\n", what,
 501                            show_ident_date(&ident, pp->date_mode));
 502                break;
 503        default:
 504                /* notin' */
 505                break;
 506        }
 507}
 508
 509static int is_empty_line(const char *line, int *len_p)
 510{
 511        int len = *len_p;
 512        while (len && isspace(line[len - 1]))
 513                len--;
 514        *len_p = len;
 515        return !len;
 516}
 517
 518static const char *skip_empty_lines(const char *msg)
 519{
 520        for (;;) {
 521                int linelen = get_one_line(msg);
 522                int ll = linelen;
 523                if (!linelen)
 524                        break;
 525                if (!is_empty_line(msg, &ll))
 526                        break;
 527                msg += linelen;
 528        }
 529        return msg;
 530}
 531
 532static void add_merge_info(const struct pretty_print_context *pp,
 533                           struct strbuf *sb, const struct commit *commit)
 534{
 535        struct commit_list *parent = commit->parents;
 536
 537        if ((pp->fmt == CMIT_FMT_ONELINE) || (pp->fmt == CMIT_FMT_EMAIL) ||
 538            !parent || !parent->next)
 539                return;
 540
 541        strbuf_addstr(sb, "Merge:");
 542
 543        while (parent) {
 544                struct commit *p = parent->item;
 545                const char *hex = NULL;
 546                if (pp->abbrev)
 547                        hex = find_unique_abbrev(p->object.sha1, pp->abbrev);
 548                if (!hex)
 549                        hex = sha1_to_hex(p->object.sha1);
 550                parent = parent->next;
 551
 552                strbuf_addf(sb, " %s", hex);
 553        }
 554        strbuf_addch(sb, '\n');
 555}
 556
 557static char *get_header(const struct commit *commit, const char *msg,
 558                        const char *key)
 559{
 560        int key_len = strlen(key);
 561        const char *line = msg;
 562
 563        while (line) {
 564                const char *eol = strchrnul(line, '\n'), *next;
 565
 566                if (line == eol)
 567                        return NULL;
 568                if (!*eol) {
 569                        warning("malformed commit (header is missing newline): %s",
 570                                sha1_to_hex(commit->object.sha1));
 571                        next = NULL;
 572                } else
 573                        next = eol + 1;
 574                if (eol - line > key_len &&
 575                    !strncmp(line, key, key_len) &&
 576                    line[key_len] == ' ') {
 577                        return xmemdupz(line + key_len + 1, eol - line - key_len - 1);
 578                }
 579                line = next;
 580        }
 581        return NULL;
 582}
 583
 584static char *replace_encoding_header(char *buf, const char *encoding)
 585{
 586        struct strbuf tmp = STRBUF_INIT;
 587        size_t start, len;
 588        char *cp = buf;
 589
 590        /* guess if there is an encoding header before a \n\n */
 591        while (strncmp(cp, "encoding ", strlen("encoding "))) {
 592                cp = strchr(cp, '\n');
 593                if (!cp || *++cp == '\n')
 594                        return buf;
 595        }
 596        start = cp - buf;
 597        cp = strchr(cp, '\n');
 598        if (!cp)
 599                return buf; /* should not happen but be defensive */
 600        len = cp + 1 - (buf + start);
 601
 602        strbuf_attach(&tmp, buf, strlen(buf), strlen(buf) + 1);
 603        if (is_encoding_utf8(encoding)) {
 604                /* we have re-coded to UTF-8; drop the header */
 605                strbuf_remove(&tmp, start, len);
 606        } else {
 607                /* just replaces XXXX in 'encoding XXXX\n' */
 608                strbuf_splice(&tmp, start + strlen("encoding "),
 609                                          len - strlen("encoding \n"),
 610                                          encoding, strlen(encoding));
 611        }
 612        return strbuf_detach(&tmp, NULL);
 613}
 614
 615const char *logmsg_reencode(const struct commit *commit,
 616                            char **commit_encoding,
 617                            const char *output_encoding)
 618{
 619        static const char *utf8 = "UTF-8";
 620        const char *use_encoding;
 621        char *encoding;
 622        const char *msg = get_commit_buffer(commit, NULL);
 623        char *out;
 624
 625        if (!output_encoding || !*output_encoding) {
 626                if (commit_encoding)
 627                        *commit_encoding =
 628                                get_header(commit, msg, "encoding");
 629                return msg;
 630        }
 631        encoding = get_header(commit, msg, "encoding");
 632        if (commit_encoding)
 633                *commit_encoding = encoding;
 634        use_encoding = encoding ? encoding : utf8;
 635        if (same_encoding(use_encoding, output_encoding)) {
 636                /*
 637                 * No encoding work to be done. If we have no encoding header
 638                 * at all, then there's nothing to do, and we can return the
 639                 * message verbatim (whether newly allocated or not).
 640                 */
 641                if (!encoding)
 642                        return msg;
 643
 644                /*
 645                 * Otherwise, we still want to munge the encoding header in the
 646                 * result, which will be done by modifying the buffer. If we
 647                 * are using a fresh copy, we can reuse it. But if we are using
 648                 * the cached copy from get_commit_buffer, we need to duplicate it
 649                 * to avoid munging the cached copy.
 650                 */
 651                if (msg == get_cached_commit_buffer(commit, NULL))
 652                        out = xstrdup(msg);
 653                else
 654                        out = (char *)msg;
 655        }
 656        else {
 657                /*
 658                 * There's actual encoding work to do. Do the reencoding, which
 659                 * still leaves the header to be replaced in the next step. At
 660                 * this point, we are done with msg. If we allocated a fresh
 661                 * copy, we can free it.
 662                 */
 663                out = reencode_string(msg, output_encoding, use_encoding);
 664                if (out)
 665                        unuse_commit_buffer(commit, msg);
 666        }
 667
 668        /*
 669         * This replacement actually consumes the buffer we hand it, so we do
 670         * not have to worry about freeing the old "out" here.
 671         */
 672        if (out)
 673                out = replace_encoding_header(out, output_encoding);
 674
 675        if (!commit_encoding)
 676                free(encoding);
 677        /*
 678         * If the re-encoding failed, out might be NULL here; in that
 679         * case we just return the commit message verbatim.
 680         */
 681        return out ? out : msg;
 682}
 683
 684static int mailmap_name(const char **email, size_t *email_len,
 685                        const char **name, size_t *name_len)
 686{
 687        static struct string_list *mail_map;
 688        if (!mail_map) {
 689                mail_map = xcalloc(1, sizeof(*mail_map));
 690                read_mailmap(mail_map, NULL);
 691        }
 692        return mail_map->nr && map_user(mail_map, email, email_len, name, name_len);
 693}
 694
 695static size_t format_person_part(struct strbuf *sb, char part,
 696                                 const char *msg, int len, enum date_mode dmode)
 697{
 698        /* currently all placeholders have same length */
 699        const int placeholder_len = 2;
 700        struct ident_split s;
 701        const char *name, *mail;
 702        size_t maillen, namelen;
 703
 704        if (split_ident_line(&s, msg, len) < 0)
 705                goto skip;
 706
 707        name = s.name_begin;
 708        namelen = s.name_end - s.name_begin;
 709        mail = s.mail_begin;
 710        maillen = s.mail_end - s.mail_begin;
 711
 712        if (part == 'N' || part == 'E') /* mailmap lookup */
 713                mailmap_name(&mail, &maillen, &name, &namelen);
 714        if (part == 'n' || part == 'N') {       /* name */
 715                strbuf_add(sb, name, namelen);
 716                return placeholder_len;
 717        }
 718        if (part == 'e' || part == 'E') {       /* email */
 719                strbuf_add(sb, mail, maillen);
 720                return placeholder_len;
 721        }
 722
 723        if (!s.date_begin)
 724                goto skip;
 725
 726        if (part == 't') {      /* date, UNIX timestamp */
 727                strbuf_add(sb, s.date_begin, s.date_end - s.date_begin);
 728                return placeholder_len;
 729        }
 730
 731        switch (part) {
 732        case 'd':       /* date */
 733                strbuf_addstr(sb, show_ident_date(&s, dmode));
 734                return placeholder_len;
 735        case 'D':       /* date, RFC2822 style */
 736                strbuf_addstr(sb, show_ident_date(&s, DATE_RFC2822));
 737                return placeholder_len;
 738        case 'r':       /* date, relative */
 739                strbuf_addstr(sb, show_ident_date(&s, DATE_RELATIVE));
 740                return placeholder_len;
 741        case 'i':       /* date, ISO 8601 */
 742                strbuf_addstr(sb, show_ident_date(&s, DATE_ISO8601));
 743                return placeholder_len;
 744        }
 745
 746skip:
 747        /*
 748         * reading from either a bogus commit, or a reflog entry with
 749         * %gn, %ge, etc.; 'sb' cannot be updated, but we still need
 750         * to compute a valid return value.
 751         */
 752        if (part == 'n' || part == 'e' || part == 't' || part == 'd'
 753            || part == 'D' || part == 'r' || part == 'i')
 754                return placeholder_len;
 755
 756        return 0; /* unknown placeholder */
 757}
 758
 759struct chunk {
 760        size_t off;
 761        size_t len;
 762};
 763
 764enum flush_type {
 765        no_flush,
 766        flush_right,
 767        flush_left,
 768        flush_left_and_steal,
 769        flush_both
 770};
 771
 772enum trunc_type {
 773        trunc_none,
 774        trunc_left,
 775        trunc_middle,
 776        trunc_right
 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        enum trunc_type truncate;
 787        const char *message;
 788        char *commit_encoding;
 789        size_t width, indent1, indent2;
 790        int auto_color;
 791        int padding;
 792
 793        /* These offsets are relative to the start of the commit message. */
 794        struct chunk author;
 795        struct chunk committer;
 796        size_t message_off;
 797        size_t subject_off;
 798        size_t body_off;
 799
 800        /* The following ones are relative to the result struct strbuf. */
 801        struct chunk abbrev_commit_hash;
 802        struct chunk abbrev_tree_hash;
 803        struct chunk abbrev_parent_hashes;
 804        size_t wrap_start;
 805};
 806
 807static int add_again(struct strbuf *sb, struct chunk *chunk)
 808{
 809        if (chunk->len) {
 810                strbuf_adddup(sb, chunk->off, chunk->len);
 811                return 1;
 812        }
 813
 814        /*
 815         * We haven't seen this chunk before.  Our caller is surely
 816         * going to add it the hard way now.  Remember the most likely
 817         * start of the to-be-added chunk: the current end of the
 818         * struct strbuf.
 819         */
 820        chunk->off = sb->len;
 821        return 0;
 822}
 823
 824static void parse_commit_header(struct format_commit_context *context)
 825{
 826        const char *msg = context->message;
 827        int i;
 828
 829        for (i = 0; msg[i]; i++) {
 830                int eol;
 831                for (eol = i; msg[eol] && msg[eol] != '\n'; eol++)
 832                        ; /* do nothing */
 833
 834                if (i == eol) {
 835                        break;
 836                } else if (starts_with(msg + i, "author ")) {
 837                        context->author.off = i + 7;
 838                        context->author.len = eol - i - 7;
 839                } else if (starts_with(msg + i, "committer ")) {
 840                        context->committer.off = i + 10;
 841                        context->committer.len = eol - i - 10;
 842                }
 843                i = eol;
 844        }
 845        context->message_off = i;
 846        context->commit_header_parsed = 1;
 847}
 848
 849static int istitlechar(char c)
 850{
 851        return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') ||
 852                (c >= '0' && c <= '9') || c == '.' || c == '_';
 853}
 854
 855static void format_sanitized_subject(struct strbuf *sb, const char *msg)
 856{
 857        size_t trimlen;
 858        size_t start_len = sb->len;
 859        int space = 2;
 860
 861        for (; *msg && *msg != '\n'; msg++) {
 862                if (istitlechar(*msg)) {
 863                        if (space == 1)
 864                                strbuf_addch(sb, '-');
 865                        space = 0;
 866                        strbuf_addch(sb, *msg);
 867                        if (*msg == '.')
 868                                while (*(msg+1) == '.')
 869                                        msg++;
 870                } else
 871                        space |= 1;
 872        }
 873
 874        /* trim any trailing '.' or '-' characters */
 875        trimlen = 0;
 876        while (sb->len - trimlen > start_len &&
 877                (sb->buf[sb->len - 1 - trimlen] == '.'
 878                || sb->buf[sb->len - 1 - trimlen] == '-'))
 879                trimlen++;
 880        strbuf_remove(sb, sb->len - trimlen, trimlen);
 881}
 882
 883const char *format_subject(struct strbuf *sb, const char *msg,
 884                           const char *line_separator)
 885{
 886        int first = 1;
 887
 888        for (;;) {
 889                const char *line = msg;
 890                int linelen = get_one_line(line);
 891
 892                msg += linelen;
 893                if (!linelen || is_empty_line(line, &linelen))
 894                        break;
 895
 896                if (!sb)
 897                        continue;
 898                strbuf_grow(sb, linelen + 2);
 899                if (!first)
 900                        strbuf_addstr(sb, line_separator);
 901                strbuf_add(sb, line, linelen);
 902                first = 0;
 903        }
 904        return msg;
 905}
 906
 907static void parse_commit_message(struct format_commit_context *c)
 908{
 909        const char *msg = c->message + c->message_off;
 910        const char *start = c->message;
 911
 912        msg = skip_empty_lines(msg);
 913        c->subject_off = msg - start;
 914
 915        msg = format_subject(NULL, msg, NULL);
 916        msg = skip_empty_lines(msg);
 917        c->body_off = msg - start;
 918
 919        c->commit_message_parsed = 1;
 920}
 921
 922static void strbuf_wrap(struct strbuf *sb, size_t pos,
 923                        size_t width, size_t indent1, size_t indent2)
 924{
 925        struct strbuf tmp = STRBUF_INIT;
 926
 927        if (pos)
 928                strbuf_add(&tmp, sb->buf, pos);
 929        strbuf_add_wrapped_text(&tmp, sb->buf + pos,
 930                                (int) indent1, (int) indent2, (int) width);
 931        strbuf_swap(&tmp, sb);
 932        strbuf_release(&tmp);
 933}
 934
 935static void rewrap_message_tail(struct strbuf *sb,
 936                                struct format_commit_context *c,
 937                                size_t new_width, size_t new_indent1,
 938                                size_t new_indent2)
 939{
 940        if (c->width == new_width && c->indent1 == new_indent1 &&
 941            c->indent2 == new_indent2)
 942                return;
 943        if (c->wrap_start < sb->len)
 944                strbuf_wrap(sb, c->wrap_start, c->width, c->indent1, c->indent2);
 945        c->wrap_start = sb->len;
 946        c->width = new_width;
 947        c->indent1 = new_indent1;
 948        c->indent2 = new_indent2;
 949}
 950
 951static int format_reflog_person(struct strbuf *sb,
 952                                char part,
 953                                struct reflog_walk_info *log,
 954                                enum date_mode dmode)
 955{
 956        const char *ident;
 957
 958        if (!log)
 959                return 2;
 960
 961        ident = get_reflog_ident(log);
 962        if (!ident)
 963                return 2;
 964
 965        return format_person_part(sb, part, ident, strlen(ident), dmode);
 966}
 967
 968static size_t parse_color(struct strbuf *sb, /* in UTF-8 */
 969                          const char *placeholder,
 970                          struct format_commit_context *c)
 971{
 972        if (placeholder[1] == '(') {
 973                const char *begin = placeholder + 2;
 974                const char *end = strchr(begin, ')');
 975                char color[COLOR_MAXLEN];
 976
 977                if (!end)
 978                        return 0;
 979                if (starts_with(begin, "auto,")) {
 980                        if (!want_color(c->pretty_ctx->color))
 981                                return end - placeholder + 1;
 982                        begin += 5;
 983                }
 984                color_parse_mem(begin,
 985                                end - begin,
 986                                "--pretty format", color);
 987                strbuf_addstr(sb, color);
 988                return end - placeholder + 1;
 989        }
 990        if (starts_with(placeholder + 1, "red")) {
 991                strbuf_addstr(sb, GIT_COLOR_RED);
 992                return 4;
 993        } else if (starts_with(placeholder + 1, "green")) {
 994                strbuf_addstr(sb, GIT_COLOR_GREEN);
 995                return 6;
 996        } else if (starts_with(placeholder + 1, "blue")) {
 997                strbuf_addstr(sb, GIT_COLOR_BLUE);
 998                return 5;
 999        } else if (starts_with(placeholder + 1, "reset")) {
1000                strbuf_addstr(sb, GIT_COLOR_RESET);
1001                return 6;
1002        } else
1003                return 0;
1004}
1005
1006static size_t parse_padding_placeholder(struct strbuf *sb,
1007                                        const char *placeholder,
1008                                        struct format_commit_context *c)
1009{
1010        const char *ch = placeholder;
1011        enum flush_type flush_type;
1012        int to_column = 0;
1013
1014        switch (*ch++) {
1015        case '<':
1016                flush_type = flush_right;
1017                break;
1018        case '>':
1019                if (*ch == '<') {
1020                        flush_type = flush_both;
1021                        ch++;
1022                } else if (*ch == '>') {
1023                        flush_type = flush_left_and_steal;
1024                        ch++;
1025                } else
1026                        flush_type = flush_left;
1027                break;
1028        default:
1029                return 0;
1030        }
1031
1032        /* the next value means "wide enough to that column" */
1033        if (*ch == '|') {
1034                to_column = 1;
1035                ch++;
1036        }
1037
1038        if (*ch == '(') {
1039                const char *start = ch + 1;
1040                const char *end = start + strcspn(start, ",)");
1041                char *next;
1042                int width;
1043                if (!end || end == start)
1044                        return 0;
1045                width = strtoul(start, &next, 10);
1046                if (next == start || width == 0)
1047                        return 0;
1048                c->padding = to_column ? -width : width;
1049                c->flush_type = flush_type;
1050
1051                if (*end == ',') {
1052                        start = end + 1;
1053                        end = strchr(start, ')');
1054                        if (!end || end == start)
1055                                return 0;
1056                        if (starts_with(start, "trunc)"))
1057                                c->truncate = trunc_right;
1058                        else if (starts_with(start, "ltrunc)"))
1059                                c->truncate = trunc_left;
1060                        else if (starts_with(start, "mtrunc)"))
1061                                c->truncate = trunc_middle;
1062                        else
1063                                return 0;
1064                } else
1065                        c->truncate = trunc_none;
1066
1067                return end - placeholder + 1;
1068        }
1069        return 0;
1070}
1071
1072static size_t format_commit_one(struct strbuf *sb, /* in UTF-8 */
1073                                const char *placeholder,
1074                                void *context)
1075{
1076        struct format_commit_context *c = context;
1077        const struct commit *commit = c->commit;
1078        const char *msg = c->message;
1079        struct commit_list *p;
1080        int h1, h2;
1081
1082        /* these are independent of the commit */
1083        switch (placeholder[0]) {
1084        case 'C':
1085                if (starts_with(placeholder + 1, "(auto)")) {
1086                        c->auto_color = 1;
1087                        return 7; /* consumed 7 bytes, "C(auto)" */
1088                } else {
1089                        int ret = parse_color(sb, placeholder, c);
1090                        if (ret)
1091                                c->auto_color = 0;
1092                        /*
1093                         * Otherwise, we decided to treat %C<unknown>
1094                         * as a literal string, and the previous
1095                         * %C(auto) is still valid.
1096                         */
1097                        return ret;
1098                }
1099        case 'n':               /* newline */
1100                strbuf_addch(sb, '\n');
1101                return 1;
1102        case 'x':
1103                /* %x00 == NUL, %x0a == LF, etc. */
1104                if (0 <= (h1 = hexval_table[0xff & placeholder[1]]) &&
1105                    h1 <= 16 &&
1106                    0 <= (h2 = hexval_table[0xff & placeholder[2]]) &&
1107                    h2 <= 16) {
1108                        strbuf_addch(sb, (h1<<4)|h2);
1109                        return 3;
1110                } else
1111                        return 0;
1112        case 'w':
1113                if (placeholder[1] == '(') {
1114                        unsigned long width = 0, indent1 = 0, indent2 = 0;
1115                        char *next;
1116                        const char *start = placeholder + 2;
1117                        const char *end = strchr(start, ')');
1118                        if (!end)
1119                                return 0;
1120                        if (end > start) {
1121                                width = strtoul(start, &next, 10);
1122                                if (*next == ',') {
1123                                        indent1 = strtoul(next + 1, &next, 10);
1124                                        if (*next == ',') {
1125                                                indent2 = strtoul(next + 1,
1126                                                                 &next, 10);
1127                                        }
1128                                }
1129                                if (*next != ')')
1130                                        return 0;
1131                        }
1132                        rewrap_message_tail(sb, c, width, indent1, indent2);
1133                        return end - placeholder + 1;
1134                } else
1135                        return 0;
1136
1137        case '<':
1138        case '>':
1139                return parse_padding_placeholder(sb, placeholder, c);
1140        }
1141
1142        /* these depend on the commit */
1143        if (!commit->object.parsed)
1144                parse_object(commit->object.sha1);
1145
1146        switch (placeholder[0]) {
1147        case 'H':               /* commit hash */
1148                strbuf_addstr(sb, diff_get_color(c->auto_color, DIFF_COMMIT));
1149                strbuf_addstr(sb, sha1_to_hex(commit->object.sha1));
1150                strbuf_addstr(sb, diff_get_color(c->auto_color, DIFF_RESET));
1151                return 1;
1152        case 'h':               /* abbreviated commit hash */
1153                strbuf_addstr(sb, diff_get_color(c->auto_color, DIFF_COMMIT));
1154                if (add_again(sb, &c->abbrev_commit_hash)) {
1155                        strbuf_addstr(sb, diff_get_color(c->auto_color, DIFF_RESET));
1156                        return 1;
1157                }
1158                strbuf_addstr(sb, find_unique_abbrev(commit->object.sha1,
1159                                                     c->pretty_ctx->abbrev));
1160                strbuf_addstr(sb, diff_get_color(c->auto_color, DIFF_RESET));
1161                c->abbrev_commit_hash.len = sb->len - c->abbrev_commit_hash.off;
1162                return 1;
1163        case 'T':               /* tree hash */
1164                strbuf_addstr(sb, sha1_to_hex(commit->tree->object.sha1));
1165                return 1;
1166        case 't':               /* abbreviated tree hash */
1167                if (add_again(sb, &c->abbrev_tree_hash))
1168                        return 1;
1169                strbuf_addstr(sb, find_unique_abbrev(commit->tree->object.sha1,
1170                                                     c->pretty_ctx->abbrev));
1171                c->abbrev_tree_hash.len = sb->len - c->abbrev_tree_hash.off;
1172                return 1;
1173        case 'P':               /* parent hashes */
1174                for (p = commit->parents; p; p = p->next) {
1175                        if (p != commit->parents)
1176                                strbuf_addch(sb, ' ');
1177                        strbuf_addstr(sb, sha1_to_hex(p->item->object.sha1));
1178                }
1179                return 1;
1180        case 'p':               /* abbreviated parent hashes */
1181                if (add_again(sb, &c->abbrev_parent_hashes))
1182                        return 1;
1183                for (p = commit->parents; p; p = p->next) {
1184                        if (p != commit->parents)
1185                                strbuf_addch(sb, ' ');
1186                        strbuf_addstr(sb, find_unique_abbrev(
1187                                        p->item->object.sha1,
1188                                        c->pretty_ctx->abbrev));
1189                }
1190                c->abbrev_parent_hashes.len = sb->len -
1191                                              c->abbrev_parent_hashes.off;
1192                return 1;
1193        case 'm':               /* left/right/bottom */
1194                strbuf_addstr(sb, get_revision_mark(NULL, commit));
1195                return 1;
1196        case 'd':
1197                load_ref_decorations(DECORATE_SHORT_REFS);
1198                format_decorations(sb, commit, c->auto_color);
1199                return 1;
1200        case 'g':               /* reflog info */
1201                switch(placeholder[1]) {
1202                case 'd':       /* reflog selector */
1203                case 'D':
1204                        if (c->pretty_ctx->reflog_info)
1205                                get_reflog_selector(sb,
1206                                                    c->pretty_ctx->reflog_info,
1207                                                    c->pretty_ctx->date_mode,
1208                                                    c->pretty_ctx->date_mode_explicit,
1209                                                    (placeholder[1] == 'd'));
1210                        return 2;
1211                case 's':       /* reflog message */
1212                        if (c->pretty_ctx->reflog_info)
1213                                get_reflog_message(sb, c->pretty_ctx->reflog_info);
1214                        return 2;
1215                case 'n':
1216                case 'N':
1217                case 'e':
1218                case 'E':
1219                        return format_reflog_person(sb,
1220                                                    placeholder[1],
1221                                                    c->pretty_ctx->reflog_info,
1222                                                    c->pretty_ctx->date_mode);
1223                }
1224                return 0;       /* unknown %g placeholder */
1225        case 'N':
1226                if (c->pretty_ctx->notes_message) {
1227                        strbuf_addstr(sb, c->pretty_ctx->notes_message);
1228                        return 1;
1229                }
1230                return 0;
1231        }
1232
1233        if (placeholder[0] == 'G') {
1234                if (!c->signature_check.result)
1235                        check_commit_signature(c->commit, &(c->signature_check));
1236                switch (placeholder[1]) {
1237                case 'G':
1238                        if (c->signature_check.gpg_output)
1239                                strbuf_addstr(sb, c->signature_check.gpg_output);
1240                        break;
1241                case '?':
1242                        switch (c->signature_check.result) {
1243                        case 'G':
1244                        case 'B':
1245                        case 'U':
1246                        case 'N':
1247                                strbuf_addch(sb, c->signature_check.result);
1248                        }
1249                        break;
1250                case 'S':
1251                        if (c->signature_check.signer)
1252                                strbuf_addstr(sb, c->signature_check.signer);
1253                        break;
1254                case 'K':
1255                        if (c->signature_check.key)
1256                                strbuf_addstr(sb, c->signature_check.key);
1257                        break;
1258                default:
1259                        return 0;
1260                }
1261                return 2;
1262        }
1263
1264
1265        /* For the rest we have to parse the commit header. */
1266        if (!c->commit_header_parsed)
1267                parse_commit_header(c);
1268
1269        switch (placeholder[0]) {
1270        case 'a':       /* author ... */
1271                return format_person_part(sb, placeholder[1],
1272                                   msg + c->author.off, c->author.len,
1273                                   c->pretty_ctx->date_mode);
1274        case 'c':       /* committer ... */
1275                return format_person_part(sb, placeholder[1],
1276                                   msg + c->committer.off, c->committer.len,
1277                                   c->pretty_ctx->date_mode);
1278        case 'e':       /* encoding */
1279                if (c->commit_encoding)
1280                        strbuf_addstr(sb, c->commit_encoding);
1281                return 1;
1282        case 'B':       /* raw body */
1283                /* message_off is always left at the initial newline */
1284                strbuf_addstr(sb, msg + c->message_off + 1);
1285                return 1;
1286        }
1287
1288        /* Now we need to parse the commit message. */
1289        if (!c->commit_message_parsed)
1290                parse_commit_message(c);
1291
1292        switch (placeholder[0]) {
1293        case 's':       /* subject */
1294                format_subject(sb, msg + c->subject_off, " ");
1295                return 1;
1296        case 'f':       /* sanitized subject */
1297                format_sanitized_subject(sb, msg + c->subject_off);
1298                return 1;
1299        case 'b':       /* body */
1300                strbuf_addstr(sb, msg + c->body_off);
1301                return 1;
1302        }
1303        return 0;       /* unknown placeholder */
1304}
1305
1306static size_t format_and_pad_commit(struct strbuf *sb, /* in UTF-8 */
1307                                    const char *placeholder,
1308                                    struct format_commit_context *c)
1309{
1310        struct strbuf local_sb = STRBUF_INIT;
1311        int total_consumed = 0, len, padding = c->padding;
1312        if (padding < 0) {
1313                const char *start = strrchr(sb->buf, '\n');
1314                int occupied;
1315                if (!start)
1316                        start = sb->buf;
1317                occupied = utf8_strnwidth(start, -1, 1);
1318                padding = (-padding) - occupied;
1319        }
1320        while (1) {
1321                int modifier = *placeholder == 'C';
1322                int consumed = format_commit_one(&local_sb, placeholder, c);
1323                total_consumed += consumed;
1324
1325                if (!modifier)
1326                        break;
1327
1328                placeholder += consumed;
1329                if (*placeholder != '%')
1330                        break;
1331                placeholder++;
1332                total_consumed++;
1333        }
1334        len = utf8_strnwidth(local_sb.buf, -1, 1);
1335
1336        if (c->flush_type == flush_left_and_steal) {
1337                const char *ch = sb->buf + sb->len - 1;
1338                while (len > padding && ch > sb->buf) {
1339                        const char *p;
1340                        if (*ch == ' ') {
1341                                ch--;
1342                                padding++;
1343                                continue;
1344                        }
1345                        /* check for trailing ansi sequences */
1346                        if (*ch != 'm')
1347                                break;
1348                        p = ch - 1;
1349                        while (ch - p < 10 && *p != '\033')
1350                                p--;
1351                        if (*p != '\033' ||
1352                            ch + 1 - p != display_mode_esc_sequence_len(p))
1353                                break;
1354                        /*
1355                         * got a good ansi sequence, put it back to
1356                         * local_sb as we're cutting sb
1357                         */
1358                        strbuf_insert(&local_sb, 0, p, ch + 1 - p);
1359                        ch = p - 1;
1360                }
1361                strbuf_setlen(sb, ch + 1 - sb->buf);
1362                c->flush_type = flush_left;
1363        }
1364
1365        if (len > padding) {
1366                switch (c->truncate) {
1367                case trunc_left:
1368                        strbuf_utf8_replace(&local_sb,
1369                                            0, len - (padding - 2),
1370                                            "..");
1371                        break;
1372                case trunc_middle:
1373                        strbuf_utf8_replace(&local_sb,
1374                                            padding / 2 - 1,
1375                                            len - (padding - 2),
1376                                            "..");
1377                        break;
1378                case trunc_right:
1379                        strbuf_utf8_replace(&local_sb,
1380                                            padding - 2, len - (padding - 2),
1381                                            "..");
1382                        break;
1383                case trunc_none:
1384                        break;
1385                }
1386                strbuf_addbuf(sb, &local_sb);
1387        } else {
1388                int sb_len = sb->len, offset = 0;
1389                if (c->flush_type == flush_left)
1390                        offset = padding - len;
1391                else if (c->flush_type == flush_both)
1392                        offset = (padding - len) / 2;
1393                /*
1394                 * we calculate padding in columns, now
1395                 * convert it back to chars
1396                 */
1397                padding = padding - len + local_sb.len;
1398                strbuf_grow(sb, padding);
1399                strbuf_setlen(sb, sb_len + padding);
1400                memset(sb->buf + sb_len, ' ', sb->len - sb_len);
1401                memcpy(sb->buf + sb_len + offset, local_sb.buf,
1402                       local_sb.len);
1403        }
1404        strbuf_release(&local_sb);
1405        c->flush_type = no_flush;
1406        return total_consumed;
1407}
1408
1409static size_t format_commit_item(struct strbuf *sb, /* in UTF-8 */
1410                                 const char *placeholder,
1411                                 void *context)
1412{
1413        int consumed;
1414        size_t orig_len;
1415        enum {
1416                NO_MAGIC,
1417                ADD_LF_BEFORE_NON_EMPTY,
1418                DEL_LF_BEFORE_EMPTY,
1419                ADD_SP_BEFORE_NON_EMPTY
1420        } magic = NO_MAGIC;
1421
1422        switch (placeholder[0]) {
1423        case '-':
1424                magic = DEL_LF_BEFORE_EMPTY;
1425                break;
1426        case '+':
1427                magic = ADD_LF_BEFORE_NON_EMPTY;
1428                break;
1429        case ' ':
1430                magic = ADD_SP_BEFORE_NON_EMPTY;
1431                break;
1432        default:
1433                break;
1434        }
1435        if (magic != NO_MAGIC)
1436                placeholder++;
1437
1438        orig_len = sb->len;
1439        if (((struct format_commit_context *)context)->flush_type != no_flush)
1440                consumed = format_and_pad_commit(sb, placeholder, context);
1441        else
1442                consumed = format_commit_one(sb, placeholder, context);
1443        if (magic == NO_MAGIC)
1444                return consumed;
1445
1446        if ((orig_len == sb->len) && magic == DEL_LF_BEFORE_EMPTY) {
1447                while (sb->len && sb->buf[sb->len - 1] == '\n')
1448                        strbuf_setlen(sb, sb->len - 1);
1449        } else if (orig_len != sb->len) {
1450                if (magic == ADD_LF_BEFORE_NON_EMPTY)
1451                        strbuf_insert(sb, orig_len, "\n", 1);
1452                else if (magic == ADD_SP_BEFORE_NON_EMPTY)
1453                        strbuf_insert(sb, orig_len, " ", 1);
1454        }
1455        return consumed + 1;
1456}
1457
1458static size_t userformat_want_item(struct strbuf *sb, const char *placeholder,
1459                                   void *context)
1460{
1461        struct userformat_want *w = context;
1462
1463        if (*placeholder == '+' || *placeholder == '-' || *placeholder == ' ')
1464                placeholder++;
1465
1466        switch (*placeholder) {
1467        case 'N':
1468                w->notes = 1;
1469                break;
1470        }
1471        return 0;
1472}
1473
1474void userformat_find_requirements(const char *fmt, struct userformat_want *w)
1475{
1476        struct strbuf dummy = STRBUF_INIT;
1477
1478        if (!fmt) {
1479                if (!user_format)
1480                        return;
1481                fmt = user_format;
1482        }
1483        strbuf_expand(&dummy, fmt, userformat_want_item, w);
1484        strbuf_release(&dummy);
1485}
1486
1487void format_commit_message(const struct commit *commit,
1488                           const char *format, struct strbuf *sb,
1489                           const struct pretty_print_context *pretty_ctx)
1490{
1491        struct format_commit_context context;
1492        const char *output_enc = pretty_ctx->output_encoding;
1493        const char *utf8 = "UTF-8";
1494
1495        memset(&context, 0, sizeof(context));
1496        context.commit = commit;
1497        context.pretty_ctx = pretty_ctx;
1498        context.wrap_start = sb->len;
1499        /*
1500         * convert a commit message to UTF-8 first
1501         * as far as 'format_commit_item' assumes it in UTF-8
1502         */
1503        context.message = logmsg_reencode(commit,
1504                                          &context.commit_encoding,
1505                                          utf8);
1506
1507        strbuf_expand(sb, format, format_commit_item, &context);
1508        rewrap_message_tail(sb, &context, 0, 0, 0);
1509
1510        /* then convert a commit message to an actual output encoding */
1511        if (output_enc) {
1512                if (same_encoding(utf8, output_enc))
1513                        output_enc = NULL;
1514        } else {
1515                if (context.commit_encoding &&
1516                    !same_encoding(context.commit_encoding, utf8))
1517                        output_enc = context.commit_encoding;
1518        }
1519
1520        if (output_enc) {
1521                int outsz;
1522                char *out = reencode_string_len(sb->buf, sb->len,
1523                                                output_enc, utf8, &outsz);
1524                if (out)
1525                        strbuf_attach(sb, out, outsz, outsz + 1);
1526        }
1527
1528        free(context.commit_encoding);
1529        unuse_commit_buffer(commit, context.message);
1530}
1531
1532static void pp_header(struct pretty_print_context *pp,
1533                      const char *encoding,
1534                      const struct commit *commit,
1535                      const char **msg_p,
1536                      struct strbuf *sb)
1537{
1538        int parents_shown = 0;
1539
1540        for (;;) {
1541                const char *line = *msg_p;
1542                int linelen = get_one_line(*msg_p);
1543
1544                if (!linelen)
1545                        return;
1546                *msg_p += linelen;
1547
1548                if (linelen == 1)
1549                        /* End of header */
1550                        return;
1551
1552                if (pp->fmt == CMIT_FMT_RAW) {
1553                        strbuf_add(sb, line, linelen);
1554                        continue;
1555                }
1556
1557                if (starts_with(line, "parent ")) {
1558                        if (linelen != 48)
1559                                die("bad parent line in commit");
1560                        continue;
1561                }
1562
1563                if (!parents_shown) {
1564                        unsigned num = commit_list_count(commit->parents);
1565                        /* with enough slop */
1566                        strbuf_grow(sb, num * 50 + 20);
1567                        add_merge_info(pp, sb, commit);
1568                        parents_shown = 1;
1569                }
1570
1571                /*
1572                 * MEDIUM == DEFAULT shows only author with dates.
1573                 * FULL shows both authors but not dates.
1574                 * FULLER shows both authors and dates.
1575                 */
1576                if (starts_with(line, "author ")) {
1577                        strbuf_grow(sb, linelen + 80);
1578                        pp_user_info(pp, "Author", sb, line + 7, encoding);
1579                }
1580                if (starts_with(line, "committer ") &&
1581                    (pp->fmt == CMIT_FMT_FULL || pp->fmt == CMIT_FMT_FULLER)) {
1582                        strbuf_grow(sb, linelen + 80);
1583                        pp_user_info(pp, "Commit", sb, line + 10, encoding);
1584                }
1585        }
1586}
1587
1588void pp_title_line(struct pretty_print_context *pp,
1589                   const char **msg_p,
1590                   struct strbuf *sb,
1591                   const char *encoding,
1592                   int need_8bit_cte)
1593{
1594        static const int max_length = 78; /* per rfc2047 */
1595        struct strbuf title;
1596
1597        strbuf_init(&title, 80);
1598        *msg_p = format_subject(&title, *msg_p,
1599                                pp->preserve_subject ? "\n" : " ");
1600
1601        strbuf_grow(sb, title.len + 1024);
1602        if (pp->subject) {
1603                strbuf_addstr(sb, pp->subject);
1604                if (needs_rfc2047_encoding(title.buf, title.len, RFC2047_SUBJECT))
1605                        add_rfc2047(sb, title.buf, title.len,
1606                                                encoding, RFC2047_SUBJECT);
1607                else
1608                        strbuf_add_wrapped_bytes(sb, title.buf, title.len,
1609                                         -last_line_length(sb), 1, max_length);
1610        } else {
1611                strbuf_addbuf(sb, &title);
1612        }
1613        strbuf_addch(sb, '\n');
1614
1615        if (need_8bit_cte == 0) {
1616                int i;
1617                for (i = 0; i < pp->in_body_headers.nr; i++) {
1618                        if (has_non_ascii(pp->in_body_headers.items[i].string)) {
1619                                need_8bit_cte = 1;
1620                                break;
1621                        }
1622                }
1623        }
1624
1625        if (need_8bit_cte > 0) {
1626                const char *header_fmt =
1627                        "MIME-Version: 1.0\n"
1628                        "Content-Type: text/plain; charset=%s\n"
1629                        "Content-Transfer-Encoding: 8bit\n";
1630                strbuf_addf(sb, header_fmt, encoding);
1631        }
1632        if (pp->after_subject) {
1633                strbuf_addstr(sb, pp->after_subject);
1634        }
1635        if (pp->fmt == CMIT_FMT_EMAIL) {
1636                strbuf_addch(sb, '\n');
1637        }
1638
1639        if (pp->in_body_headers.nr) {
1640                int i;
1641                for (i = 0; i < pp->in_body_headers.nr; i++) {
1642                        strbuf_addstr(sb, pp->in_body_headers.items[i].string);
1643                        free(pp->in_body_headers.items[i].string);
1644                }
1645                string_list_clear(&pp->in_body_headers, 0);
1646                strbuf_addch(sb, '\n');
1647        }
1648
1649        strbuf_release(&title);
1650}
1651
1652void pp_remainder(struct pretty_print_context *pp,
1653                  const char **msg_p,
1654                  struct strbuf *sb,
1655                  int indent)
1656{
1657        int first = 1;
1658        for (;;) {
1659                const char *line = *msg_p;
1660                int linelen = get_one_line(line);
1661                *msg_p += linelen;
1662
1663                if (!linelen)
1664                        break;
1665
1666                if (is_empty_line(line, &linelen)) {
1667                        if (first)
1668                                continue;
1669                        if (pp->fmt == CMIT_FMT_SHORT)
1670                                break;
1671                }
1672                first = 0;
1673
1674                strbuf_grow(sb, linelen + indent + 20);
1675                if (indent) {
1676                        memset(sb->buf + sb->len, ' ', indent);
1677                        strbuf_setlen(sb, sb->len + indent);
1678                }
1679                strbuf_add(sb, line, linelen);
1680                strbuf_addch(sb, '\n');
1681        }
1682}
1683
1684void pretty_print_commit(struct pretty_print_context *pp,
1685                         const struct commit *commit,
1686                         struct strbuf *sb)
1687{
1688        unsigned long beginning_of_body;
1689        int indent = 4;
1690        const char *msg;
1691        const char *reencoded;
1692        const char *encoding;
1693        int need_8bit_cte = pp->need_8bit_cte;
1694
1695        if (pp->fmt == CMIT_FMT_USERFORMAT) {
1696                format_commit_message(commit, user_format, sb, pp);
1697                return;
1698        }
1699
1700        encoding = get_log_output_encoding();
1701        msg = reencoded = logmsg_reencode(commit, NULL, encoding);
1702
1703        if (pp->fmt == CMIT_FMT_ONELINE || pp->fmt == CMIT_FMT_EMAIL)
1704                indent = 0;
1705
1706        /*
1707         * We need to check and emit Content-type: to mark it
1708         * as 8-bit if we haven't done so.
1709         */
1710        if (pp->fmt == CMIT_FMT_EMAIL && need_8bit_cte == 0) {
1711                int i, ch, in_body;
1712
1713                for (in_body = i = 0; (ch = msg[i]); i++) {
1714                        if (!in_body) {
1715                                /* author could be non 7-bit ASCII but
1716                                 * the log may be so; skip over the
1717                                 * header part first.
1718                                 */
1719                                if (ch == '\n' && msg[i+1] == '\n')
1720                                        in_body = 1;
1721                        }
1722                        else if (non_ascii(ch)) {
1723                                need_8bit_cte = 1;
1724                                break;
1725                        }
1726                }
1727        }
1728
1729        pp_header(pp, encoding, commit, &msg, sb);
1730        if (pp->fmt != CMIT_FMT_ONELINE && !pp->subject) {
1731                strbuf_addch(sb, '\n');
1732        }
1733
1734        /* Skip excess blank lines at the beginning of body, if any... */
1735        msg = skip_empty_lines(msg);
1736
1737        /* These formats treat the title line specially. */
1738        if (pp->fmt == CMIT_FMT_ONELINE || pp->fmt == CMIT_FMT_EMAIL)
1739                pp_title_line(pp, &msg, sb, encoding, need_8bit_cte);
1740
1741        beginning_of_body = sb->len;
1742        if (pp->fmt != CMIT_FMT_ONELINE)
1743                pp_remainder(pp, &msg, sb, indent);
1744        strbuf_rtrim(sb);
1745
1746        /* Make sure there is an EOLN for the non-oneline case */
1747        if (pp->fmt != CMIT_FMT_ONELINE)
1748                strbuf_addch(sb, '\n');
1749
1750        /*
1751         * The caller may append additional body text in e-mail
1752         * format.  Make sure we did not strip the blank line
1753         * between the header and the body.
1754         */
1755        if (pp->fmt == CMIT_FMT_EMAIL && sb->len <= beginning_of_body)
1756                strbuf_addch(sb, '\n');
1757
1758        unuse_commit_buffer(commit, reencoded);
1759}
1760
1761void pp_commit_easy(enum cmit_fmt fmt, const struct commit *commit,
1762                    struct strbuf *sb)
1763{
1764        struct pretty_print_context pp = {0};
1765        pp.fmt = fmt;
1766        pretty_print_commit(&pp, commit, sb);
1767}