pretty.c

   1 #include "cache.h"
   2 #include "config.h"
   3 #include "commit.h"
   4 #include "utf8.h"
   5 #include "diff.h"
   6 #include "revision.h"
   7 #include "string-list.h"
   8 #include "mailmap.h"
   9 #include "log-tree.h"
  10 #include "notes.h"
  11 #include "color.h"
  12 #include "reflog-walk.h"
  13 #include "gpg-interface.h"
  14 #include "trailer.h"
  15
  16 static char *user_format;
  17 static struct cmt_fmt_map {
  18         const char *name;
  19         enum cmit_fmt format;
  20         int is_tformat;
  21         int expand_tabs_in_log;
  22         int is_alias;
  23         const char *user_format;
  24 } *commit_formats;
  25 static size_t builtin_formats_len;
  26 static size_t commit_formats_len;
  27 static size_t commit_formats_alloc;
  28 static struct cmt_fmt_map *find_commit_format(const char *sought);
  29
  30 int commit_format_is_empty(enum cmit_fmt fmt)
  31 {
  32         return fmt == CMIT_FMT_USERFORMAT && !*user_format;
  33 }
  34
  35 static void save_user_format(struct rev_info *rev, const char *cp, int is_tformat)
  36 {
  37         free(user_format);
  38         user_format = xstrdup(cp);
  39         if (is_tformat)
  40                 rev->use_terminator = 1;
  41         rev->commit_format = CMIT_FMT_USERFORMAT;
  42 }
  43
  44 static int git_pretty_formats_config(const char *var, const char *value, void *cb)
  45 {
  46         struct cmt_fmt_map *commit_format = NULL;
  47         const char *name;
  48         const char *fmt;
  49         int i;
  50
  51         if (!skip_prefix(var, "pretty.", &name))
  52                 return 0;
  53
  54         for (i = 0; i < builtin_formats_len; i++) {
  55                 if (!strcmp(commit_formats[i].name, name))
  56                         return 0;
  57         }
  58
  59         for (i = builtin_formats_len; i < commit_formats_len; i++) {
  60                 if (!strcmp(commit_formats[i].name, name)) {
  61                         commit_format = &commit_formats[i];
  62                         break;
  63                 }
  64         }
  65
  66         if (!commit_format) {
  67                 ALLOC_GROW(commit_formats, commit_formats_len+1,
  68                            commit_formats_alloc);
  69                 commit_format = &commit_formats[commit_formats_len];
  70                 memset(commit_format, 0, sizeof(*commit_format));
  71                 commit_formats_len++;
  72         }
  73
  74         commit_format->name = xstrdup(name);
  75         commit_format->format = CMIT_FMT_USERFORMAT;
  76         if (git_config_string(&fmt, var, value))
  77                 return -1;
  78
  79         if (skip_prefix(fmt, "format:", &fmt))
  80                 commit_format->is_tformat = 0;
  81         else if (skip_prefix(fmt, "tformat:", &fmt) || strchr(fmt, '%'))
  82                 commit_format->is_tformat = 1;
  83         else
  84                 commit_format->is_alias = 1;
  85         commit_format->user_format = fmt;
  86
  87         return 0;
  88 }
  89
  90 static void setup_commit_formats(void)
  91 {
  92         struct cmt_fmt_map builtin_formats[] = {
  93                 { "raw",        CMIT_FMT_RAW,           0,      0 },
  94                 { "medium",     CMIT_FMT_MEDIUM,        0,      8 },
  95                 { "short",      CMIT_FMT_SHORT,         0,      0 },
  96                 { "email",      CMIT_FMT_EMAIL,         0,      0 },
  97                 { "mboxrd",     CMIT_FMT_MBOXRD,        0,      0 },
  98                 { "fuller",     CMIT_FMT_FULLER,        0,      8 },
  99                 { "full",       CMIT_FMT_FULL,          0,      8 },
 100                 { "oneline",    CMIT_FMT_ONELINE,       1,      0 }
 101         };
 102         commit_formats_len = ARRAY_SIZE(builtin_formats);
 103         builtin_formats_len = commit_formats_len;
 104         ALLOC_GROW(commit_formats, commit_formats_len, commit_formats_alloc);
 105         memcpy(commit_formats, builtin_formats,
 106                sizeof(*builtin_formats)*ARRAY_SIZE(builtin_formats));
 107
 108         git_config(git_pretty_formats_config, NULL);
 109 }
 110
 111 static struct cmt_fmt_map *find_commit_format_recursive(const char *sought,
 112                                                         const char *original,
 113                                                         int num_redirections)
 114 {
 115         struct cmt_fmt_map *found = NULL;
 116         size_t found_match_len = 0;
 117         int i;
 118
 119         if (num_redirections >= commit_formats_len)
 120                 die("invalid --pretty format: "
 121                     "'%s' references an alias which points to itself",
 122                     original);
 123
 124         for (i = 0; i < commit_formats_len; i++) {
 125                 size_t match_len;
 126
 127                 if (!starts_with(commit_formats[i].name, sought))
 128                         continue;
 129
 130                 match_len = strlen(commit_formats[i].name);
 131                 if (found == NULL || found_match_len > match_len) {
 132                         found = &commit_formats[i];
 133                         found_match_len = match_len;
 134                 }
 135         }
 136
 137         if (found && found->is_alias) {
 138                 found = find_commit_format_recursive(found->user_format,
 139                                                      original,
 140                                                      num_redirections+1);
 141         }
 142
 143         return found;
 144 }
 145
 146 static struct cmt_fmt_map *find_commit_format(const char *sought)
 147 {
 148         if (!commit_formats)
 149                 setup_commit_formats();
 150
 151         return find_commit_format_recursive(sought, sought, 0);
 152 }
 153
 154 void get_commit_format(const char *arg, struct rev_info *rev)
 155 {
 156         struct cmt_fmt_map *commit_format;
 157
 158         rev->use_terminator = 0;
 159         if (!arg) {
 160                 rev->commit_format = CMIT_FMT_DEFAULT;
 161                 return;
 162         }
 163         if (skip_prefix(arg, "format:", &arg)) {
 164                 save_user_format(rev, arg, 0);
 165                 return;
 166         }
 167
 168         if (!*arg || skip_prefix(arg, "tformat:", &arg) || strchr(arg, '%')) {
 169                 save_user_format(rev, arg, 1);
 170                 return;
 171         }
 172
 173         commit_format = find_commit_format(arg);
 174         if (!commit_format)
 175                 die("invalid --pretty format: %s", arg);
 176
 177         rev->commit_format = commit_format->format;
 178         rev->use_terminator = commit_format->is_tformat;
 179         rev->expand_tabs_in_log_default = commit_format->expand_tabs_in_log;
 180         if (commit_format->format == CMIT_FMT_USERFORMAT) {
 181                 save_user_format(rev, commit_format->user_format,
 182                                  commit_format->is_tformat);
 183         }
 184 }
 185
 186 /*
 187  * Generic support for pretty-printing the header
 188  */
 189 static int get_one_line(const char *msg)
 190 {
 191         int ret = 0;
 192
 193         for (;;) {
 194                 char c = *msg++;
 195                 if (!c)
 196                         break;
 197                 ret++;
 198                 if (c == '\n')
 199                         break;
 200         }
 201         return ret;
 202 }
 203
 204 /* High bit set, or ISO-2022-INT */
 205 static int non_ascii(int ch)
 206 {
 207         return !isascii(ch) || ch == '\033';
 208 }
 209
 210 int has_non_ascii(const char *s)
 211 {
 212         int ch;
 213         if (!s)
 214                 return 0;
 215         while ((ch = *s++) != '\0') {
 216                 if (non_ascii(ch))
 217                         return 1;
 218         }
 219         return 0;
 220 }
 221
 222 static int is_rfc822_special(char ch)
 223 {
 224         switch (ch) {
 225         case '(':
 226         case ')':
 227         case '<':
 228         case '>':
 229         case '[':
 230         case ']':
 231         case ':':
 232         case ';':
 233         case '@':
 234         case ',':
 235         case '.':
 236         case '"':
 237         case '\\':
 238                 return 1;
 239         default:
 240                 return 0;
 241         }
 242 }
 243
 244 static int needs_rfc822_quoting(const char *s, int len)
 245 {
 246         int i;
 247         for (i = 0; i < len; i++)
 248                 if (is_rfc822_special(s[i]))
 249                         return 1;
 250         return 0;
 251 }
 252
 253 static int last_line_length(struct strbuf *sb)
 254 {
 255         int i;
 256
 257         /* How many bytes are already used on the last line? */
 258         for (i = sb->len - 1; i >= 0; i--)
 259                 if (sb->buf[i] == '\n')
 260                         break;
 261         return sb->len - (i + 1);
 262 }
 263
 264 static void add_rfc822_quoted(struct strbuf *out, const char *s, int len)
 265 {
 266         int i;
 267
 268         /* just a guess, we may have to also backslash-quote */
 269         strbuf_grow(out, len + 2);
 270
 271         strbuf_addch(out, '"');
 272         for (i = 0; i < len; i++) {
 273                 switch (s[i]) {
 274                 case '"':
 275                 case '\\':
 276                         strbuf_addch(out, '\\');
 277                         /* fall through */
 278                 default:
 279                         strbuf_addch(out, s[i]);
 280                 }
 281         }
 282         strbuf_addch(out, '"');
 283 }
 284
 285 enum rfc2047_type {
 286         RFC2047_SUBJECT,
 287         RFC2047_ADDRESS
 288 };
 289
 290 static int is_rfc2047_special(char ch, enum rfc2047_type type)
 291 {
 292         /*
 293          * rfc2047, section 4.2:
 294          *
 295          *    8-bit values which correspond to printable ASCII characters other
 296          *    than "=", "?", and "_" (underscore), MAY be represented as those
 297          *    characters.  (But see section 5 for restrictions.)  In
 298          *    particular, SPACE and TAB MUST NOT be represented as themselves
 299          *    within encoded words.
 300          */
 301
 302         /*
 303          * rule out non-ASCII characters and non-printable characters (the
 304          * non-ASCII check should be redundant as isprint() is not localized
 305          * and only knows about ASCII, but be defensive about that)
 306          */
 307         if (non_ascii(ch) || !isprint(ch))
 308                 return 1;
 309
 310         /*
 311          * rule out special printable characters (' ' should be the only
 312          * whitespace character considered printable, but be defensive and use
 313          * isspace())
 314          */
 315         if (isspace(ch) || ch == '=' || ch == '?' || ch == '_')
 316                 return 1;
 317
 318         /*
 319          * rfc2047, section 5.3:
 320          *
 321          *    As a replacement for a 'word' entity within a 'phrase', for example,
 322          *    one that precedes an address in a From, To, or Cc header.  The ABNF
 323          *    definition for 'phrase' from RFC 822 thus becomes:
 324          *
 325          *    phrase = 1*( encoded-word / word )
 326          *
 327          *    In this case the set of characters that may be used in a "Q"-encoded
 328          *    'encoded-word' is restricted to: <upper and lower case ASCII
 329          *    letters, decimal digits, "!", "*", "+", "-", "/", "=", and "_"
 330          *    (underscore, ASCII 95.)>.  An 'encoded-word' that appears within a
 331          *    'phrase' MUST be separated from any adjacent 'word', 'text' or
 332          *    'special' by 'linear-white-space'.
 333          */
 334
 335         if (type != RFC2047_ADDRESS)
 336                 return 0;
 337
 338         /* '=' and '_' are special cases and have been checked above */
 339         return !(isalnum(ch) || ch == '!' || ch == '*' || ch == '+' || ch == '-' || ch == '/');
 340 }
 341
 342 static int needs_rfc2047_encoding(const char *line, int len,
 343                                   enum rfc2047_type type)
 344 {
 345         int i;
 346
 347         for (i = 0; i < len; i++) {
 348                 int ch = line[i];
 349                 if (non_ascii(ch) || ch == '\n')
 350                         return 1;
 351                 if ((i + 1 < len) && (ch == '=' && line[i+1] == '?'))
 352                         return 1;
 353         }
 354
 355         return 0;
 356 }
 357
 358 static void add_rfc2047(struct strbuf *sb, const char *line, size_t len,
 359                        const char *encoding, enum rfc2047_type type)
 360 {
 361         static const int max_encoded_length = 76; /* per rfc2047 */
 362         int i;
 363         int line_len = last_line_length(sb);
 364
 365         strbuf_grow(sb, len * 3 + strlen(encoding) + 100);
 366         strbuf_addf(sb, "=?%s?q?", encoding);
 367         line_len += strlen(encoding) + 5; /* 5 for =??q? */
 368
 369         while (len) {
 370                 /*
 371                  * RFC 2047, section 5 (3):
 372                  *
 373                  * Each 'encoded-word' MUST represent an integral number of
 374                  * characters.  A multi-octet character may not be split across
 375                  * adjacent 'encoded- word's.
 376                  */
 377                 const unsigned char *p = (const unsigned char *)line;
 378                 int chrlen = mbs_chrlen(&line, &len, encoding);
 379                 int is_special = (chrlen > 1) || is_rfc2047_special(*p, type);
 380
 381                 /* "=%02X" * chrlen, or the byte itself */
 382                 const char *encoded_fmt = is_special ? "=%02X"    : "%c";
 383                 int         encoded_len = is_special ? 3 * chrlen : 1;
 384
 385                 /*
 386                  * According to RFC 2047, we could encode the special character
 387                  * ' ' (space) with '_' (underscore) for readability. But many
 388                  * programs do not understand this and just leave the
 389                  * underscore in place. Thus, we do nothing special here, which
 390                  * causes ' ' to be encoded as '=20', avoiding this problem.
 391                  */
 392
 393                 if (line_len + encoded_len + 2 > max_encoded_length) {
 394                         /* It won't fit with trailing "?=" --- break the line */
 395                         strbuf_addf(sb, "?=\n =?%s?q?", encoding);
 396                         line_len = strlen(encoding) + 5 + 1; /* =??q? plus SP */
 397                 }
 398
 399                 for (i = 0; i < chrlen; i++)
 400                         strbuf_addf(sb, encoded_fmt, p[i]);
 401                 line_len += encoded_len;
 402         }
 403         strbuf_addstr(sb, "?=");
 404 }
 405
 406 const char *show_ident_date(const struct ident_split *ident,
 407                             const struct date_mode *mode)
 408 {
 409         timestamp_t date = 0;
 410         long tz = 0;
 411
 412         if (ident->date_begin && ident->date_end)
 413                 date = parse_timestamp(ident->date_begin, NULL, 10);
 414         if (date_overflows(date))
 415                 date = 0;
 416         else {
 417                 if (ident->tz_begin && ident->tz_end)
 418                         tz = strtol(ident->tz_begin, NULL, 10);
 419                 if (tz >= INT_MAX || tz <= INT_MIN)
 420                         tz = 0;
 421         }
 422         return show_date(date, tz, mode);
 423 }
 424
 425 void pp_user_info(struct pretty_print_context *pp,
 426                   const char *what, struct strbuf *sb,
 427                   const char *line, const char *encoding)
 428 {
 429         struct ident_split ident;
 430         char *line_end;
 431         const char *mailbuf, *namebuf;
 432         size_t namelen, maillen;
 433         int max_length = 78; /* per rfc2822 */
 434
 435         if (pp->fmt == CMIT_FMT_ONELINE)
 436                 return;
 437
 438         line_end = strchrnul(line, '\n');
 439         if (split_ident_line(&ident, line, line_end - line))
 440                 return;
 441
 442         mailbuf = ident.mail_begin;
 443         maillen = ident.mail_end - ident.mail_begin;
 444         namebuf = ident.name_begin;
 445         namelen = ident.name_end - ident.name_begin;
 446
 447         if (pp->mailmap)
 448                 map_user(pp->mailmap, &mailbuf, &maillen, &namebuf, &namelen);
 449
 450         if (cmit_fmt_is_mail(pp->fmt)) {
 451                 if (pp->from_ident && ident_cmp(pp->from_ident, &ident)) {
 452                         struct strbuf buf = STRBUF_INIT;
 453
 454                         strbuf_addstr(&buf, "From: ");
 455                         strbuf_add(&buf, namebuf, namelen);
 456                         strbuf_addstr(&buf, " <");
 457                         strbuf_add(&buf, mailbuf, maillen);
 458                         strbuf_addstr(&buf, ">\n");
 459                         string_list_append(&pp->in_body_headers,
 460                                            strbuf_detach(&buf, NULL));
 461
 462                         mailbuf = pp->from_ident->mail_begin;
 463                         maillen = pp->from_ident->mail_end - mailbuf;
 464                         namebuf = pp->from_ident->name_begin;
 465                         namelen = pp->from_ident->name_end - namebuf;
 466                 }
 467
 468                 strbuf_addstr(sb, "From: ");
 469                 if (needs_rfc2047_encoding(namebuf, namelen, RFC2047_ADDRESS)) {
 470                         add_rfc2047(sb, namebuf, namelen,
 471                                     encoding, RFC2047_ADDRESS);
 472                         max_length = 76; /* per rfc2047 */
 473                 } else if (needs_rfc822_quoting(namebuf, namelen)) {
 474                         struct strbuf quoted = STRBUF_INIT;
 475                         add_rfc822_quoted(&quoted, namebuf, namelen);
 476                         strbuf_add_wrapped_bytes(sb, quoted.buf, quoted.len,
 477                                                         -6, 1, max_length);
 478                         strbuf_release(&quoted);
 479                 } else {
 480                         strbuf_add_wrapped_bytes(sb, namebuf, namelen,
 481                                                  -6, 1, max_length);
 482                 }
 483
 484                 if (max_length <
 485                     last_line_length(sb) + strlen(" <") + maillen + strlen(">"))
 486                         strbuf_addch(sb, '\n');
 487                 strbuf_addf(sb, " <%.*s>\n", (int)maillen, mailbuf);
 488         } else {
 489                 strbuf_addf(sb, "%s: %.*s%.*s <%.*s>\n", what,
 490                             (pp->fmt == CMIT_FMT_FULLER) ? 4 : 0, "    ",
 491                             (int)namelen, namebuf, (int)maillen, mailbuf);
 492         }
 493
 494         switch (pp->fmt) {
 495         case CMIT_FMT_MEDIUM:
 496                 strbuf_addf(sb, "Date:   %s\n",
 497                             show_ident_date(&ident, &pp->date_mode));
 498                 break;
 499         case CMIT_FMT_EMAIL:
 500         case CMIT_FMT_MBOXRD:
 501                 strbuf_addf(sb, "Date: %s\n",
 502                             show_ident_date(&ident, DATE_MODE(RFC2822)));
 503                 break;
 504         case CMIT_FMT_FULLER:
 505                 strbuf_addf(sb, "%sDate: %s\n", what,
 506                             show_ident_date(&ident, &pp->date_mode));
 507                 break;
 508         default:
 509                 /* notin' */
 510                 break;
 511         }
 512 }
 513
 514 static int is_blank_line(const char *line, int *len_p)
 515 {
 516         int len = *len_p;
 517         while (len && isspace(line[len - 1]))
 518                 len--;
 519         *len_p = len;
 520         return !len;
 521 }
 522
 523 const char *skip_blank_lines(const char *msg)
 524 {
 525         for (;;) {
 526                 int linelen = get_one_line(msg);
 527                 int ll = linelen;
 528                 if (!linelen)
 529                         break;
 530                 if (!is_blank_line(msg, &ll))
 531                         break;
 532                 msg += linelen;
 533         }
 534         return msg;
 535 }
 536
 537 static void add_merge_info(const struct pretty_print_context *pp,
 538                            struct strbuf *sb, const struct commit *commit)
 539 {
 540         struct commit_list *parent = commit->parents;
 541
 542         if ((pp->fmt == CMIT_FMT_ONELINE) || (cmit_fmt_is_mail(pp->fmt)) ||
 543             !parent || !parent->next)
 544                 return;
 545
 546         strbuf_addstr(sb, "Merge:");
 547
 548         while (parent) {
 549                 struct object_id *oidp = &parent->item->object.oid;
 550                 strbuf_addch(sb, ' ');
 551                 if (pp->abbrev)
 552                         strbuf_add_unique_abbrev(sb, oidp, pp->abbrev);
 553                 else
 554                         strbuf_addstr(sb, oid_to_hex(oidp));
 555                 parent = parent->next;
 556         }
 557         strbuf_addch(sb, '\n');
 558 }
 559
 560 static char *get_header(const char *msg, const char *key)
 561 {
 562         size_t len;
 563         const char *v = find_commit_header(msg, key, &len);
 564         return v ? xmemdupz(v, len) : NULL;
 565 }
 566
 567 static char *replace_encoding_header(char *buf, const char *encoding)
 568 {
 569         struct strbuf tmp = STRBUF_INIT;
 570         size_t start, len;
 571         char *cp = buf;
 572
 573         /* guess if there is an encoding header before a \n\n */
 574         while (!starts_with(cp, "encoding ")) {
 575                 cp = strchr(cp, '\n');
 576                 if (!cp || *++cp == '\n')
 577                         return buf;
 578         }
 579         start = cp - buf;
 580         cp = strchr(cp, '\n');
 581         if (!cp)
 582                 return buf; /* should not happen but be defensive */
 583         len = cp + 1 - (buf + start);
 584
 585         strbuf_attach(&tmp, buf, strlen(buf), strlen(buf) + 1);
 586         if (is_encoding_utf8(encoding)) {
 587                 /* we have re-coded to UTF-8; drop the header */
 588                 strbuf_remove(&tmp, start, len);
 589         } else {
 590                 /* just replaces XXXX in 'encoding XXXX\n' */
 591                 strbuf_splice(&tmp, start + strlen("encoding "),
 592                                           len - strlen("encoding \n"),
 593                                           encoding, strlen(encoding));
 594         }
 595         return strbuf_detach(&tmp, NULL);
 596 }
 597
 598 const char *logmsg_reencode(const struct commit *commit,
 599                             char **commit_encoding,
 600                             const char *output_encoding)
 601 {
 602         static const char *utf8 = "UTF-8";
 603         const char *use_encoding;
 604         char *encoding;
 605         const char *msg = get_commit_buffer(commit, NULL);
 606         char *out;
 607
 608         if (!output_encoding || !*output_encoding) {
 609                 if (commit_encoding)
 610                         *commit_encoding = get_header(msg, "encoding");
 611                 return msg;
 612         }
 613         encoding = get_header(msg, "encoding");
 614         if (commit_encoding)
 615                 *commit_encoding = encoding;
 616         use_encoding = encoding ? encoding : utf8;
 617         if (same_encoding(use_encoding, output_encoding)) {
 618                 /*
 619                  * No encoding work to be done. If we have no encoding header
 620                  * at all, then there's nothing to do, and we can return the
 621                  * message verbatim (whether newly allocated or not).
 622                  */
 623                 if (!encoding)
 624                         return msg;
 625
 626                 /*
 627                  * Otherwise, we still want to munge the encoding header in the
 628                  * result, which will be done by modifying the buffer. If we
 629                  * are using a fresh copy, we can reuse it. But if we are using
 630                  * the cached copy from get_commit_buffer, we need to duplicate it
 631                  * to avoid munging the cached copy.
 632                  */
 633                 if (msg == get_cached_commit_buffer(the_repository, commit, NULL))
 634                         out = xstrdup(msg);
 635                 else
 636                         out = (char *)msg;
 637         }
 638         else {
 639                 /*
 640                  * There's actual encoding work to do. Do the reencoding, which
 641                  * still leaves the header to be replaced in the next step. At
 642                  * this point, we are done with msg. If we allocated a fresh
 643                  * copy, we can free it.
 644                  */
 645                 out = reencode_string(msg, output_encoding, use_encoding);
 646                 if (out)
 647                         unuse_commit_buffer(commit, msg);
 648         }
 649
 650         /*
 651          * This replacement actually consumes the buffer we hand it, so we do
 652          * not have to worry about freeing the old "out" here.
 653          */
 654         if (out)
 655                 out = replace_encoding_header(out, output_encoding);
 656
 657         if (!commit_encoding)
 658                 free(encoding);
 659         /*
 660          * If the re-encoding failed, out might be NULL here; in that
 661          * case we just return the commit message verbatim.
 662          */
 663         return out ? out : msg;
 664 }
 665
 666 static int mailmap_name(const char **email, size_t *email_len,
 667                         const char **name, size_t *name_len)
 668 {
 669         static struct string_list *mail_map;
 670         if (!mail_map) {
 671                 mail_map = xcalloc(1, sizeof(*mail_map));
 672                 read_mailmap(mail_map, NULL);
 673         }
 674         return mail_map->nr && map_user(mail_map, email, email_len, name, name_len);
 675 }
 676
 677 static size_t format_person_part(struct strbuf *sb, char part,
 678                                  const char *msg, int len,
 679                                  const struct date_mode *dmode)
 680 {
 681         /* currently all placeholders have same length */
 682         const int placeholder_len = 2;
 683         struct ident_split s;
 684         const char *name, *mail;
 685         size_t maillen, namelen;
 686
 687         if (split_ident_line(&s, msg, len) < 0)
 688                 goto skip;
 689
 690         name = s.name_begin;
 691         namelen = s.name_end - s.name_begin;
 692         mail = s.mail_begin;
 693         maillen = s.mail_end - s.mail_begin;
 694
 695         if (part == 'N' || part == 'E') /* mailmap lookup */
 696                 mailmap_name(&mail, &maillen, &name, &namelen);
 697         if (part == 'n' || part == 'N') {       /* name */
 698                 strbuf_add(sb, name, namelen);
 699                 return placeholder_len;
 700         }
 701         if (part == 'e' || part == 'E') {       /* email */
 702                 strbuf_add(sb, mail, maillen);
 703                 return placeholder_len;
 704         }
 705
 706         if (!s.date_begin)
 707                 goto skip;
 708
 709         if (part == 't') {      /* date, UNIX timestamp */
 710                 strbuf_add(sb, s.date_begin, s.date_end - s.date_begin);
 711                 return placeholder_len;
 712         }
 713
 714         switch (part) {
 715         case 'd':       /* date */
 716                 strbuf_addstr(sb, show_ident_date(&s, dmode));
 717                 return placeholder_len;
 718         case 'D':       /* date, RFC2822 style */
 719                 strbuf_addstr(sb, show_ident_date(&s, DATE_MODE(RFC2822)));
 720                 return placeholder_len;
 721         case 'r':       /* date, relative */
 722                 strbuf_addstr(sb, show_ident_date(&s, DATE_MODE(RELATIVE)));
 723                 return placeholder_len;
 724         case 'i':       /* date, ISO 8601-like */
 725                 strbuf_addstr(sb, show_ident_date(&s, DATE_MODE(ISO8601)));
 726                 return placeholder_len;
 727         case 'I':       /* date, ISO 8601 strict */
 728                 strbuf_addstr(sb, show_ident_date(&s, DATE_MODE(ISO8601_STRICT)));
 729                 return placeholder_len;
 730         }
 731
 732 skip:
 733         /*
 734          * reading from either a bogus commit, or a reflog entry with
 735          * %gn, %ge, etc.; 'sb' cannot be updated, but we still need
 736          * to compute a valid return value.
 737          */
 738         if (part == 'n' || part == 'e' || part == 't' || part == 'd'
 739             || part == 'D' || part == 'r' || part == 'i')
 740                 return placeholder_len;
 741
 742         return 0; /* unknown placeholder */
 743 }
 744
 745 struct chunk {
 746         size_t off;
 747         size_t len;
 748 };
 749
 750 enum flush_type {
 751         no_flush,
 752         flush_right,
 753         flush_left,
 754         flush_left_and_steal,
 755         flush_both
 756 };
 757
 758 enum trunc_type {
 759         trunc_none,
 760         trunc_left,
 761         trunc_middle,
 762         trunc_right
 763 };
 764
 765 struct format_commit_context {
 766         const struct commit *commit;
 767         const struct pretty_print_context *pretty_ctx;
 768         unsigned commit_header_parsed:1;
 769         unsigned commit_message_parsed:1;
 770         struct signature_check signature_check;
 771         enum flush_type flush_type;
 772         enum trunc_type truncate;
 773         const char *message;
 774         char *commit_encoding;
 775         size_t width, indent1, indent2;
 776         int auto_color;
 777         int padding;
 778
 779         /* These offsets are relative to the start of the commit message. */
 780         struct chunk author;
 781         struct chunk committer;
 782         size_t message_off;
 783         size_t subject_off;
 784         size_t body_off;
 785
 786         /* The following ones are relative to the result struct strbuf. */
 787         size_t wrap_start;
 788 };
 789
 790 static void parse_commit_header(struct format_commit_context *context)
 791 {
 792         const char *msg = context->message;
 793         int i;
 794
 795         for (i = 0; msg[i]; i++) {
 796                 const char *name;
 797                 int eol;
 798                 for (eol = i; msg[eol] && msg[eol] != '\n'; eol++)
 799                         ; /* do nothing */
 800
 801                 if (i == eol) {
 802                         break;
 803                 } else if (skip_prefix(msg + i, "author ", &name)) {
 804                         context->author.off = name - msg;
 805                         context->author.len = msg + eol - name;
 806                 } else if (skip_prefix(msg + i, "committer ", &name)) {
 807                         context->committer.off = name - msg;
 808                         context->committer.len = msg + eol - name;
 809                 }
 810                 i = eol;
 811         }
 812         context->message_off = i;
 813         context->commit_header_parsed = 1;
 814 }
 815
 816 static int istitlechar(char c)
 817 {
 818         return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') ||
 819                 (c >= '0' && c <= '9') || c == '.' || c == '_';
 820 }
 821
 822 static void format_sanitized_subject(struct strbuf *sb, const char *msg)
 823 {
 824         size_t trimlen;
 825         size_t start_len = sb->len;
 826         int space = 2;
 827
 828         for (; *msg && *msg != '\n'; msg++) {
 829                 if (istitlechar(*msg)) {
 830                         if (space == 1)
 831                                 strbuf_addch(sb, '-');
 832                         space = 0;
 833                         strbuf_addch(sb, *msg);
 834                         if (*msg == '.')
 835                                 while (*(msg+1) == '.')
 836                                         msg++;
 837                 } else
 838                         space |= 1;
 839         }
 840
 841         /* trim any trailing '.' or '-' characters */
 842         trimlen = 0;
 843         while (sb->len - trimlen > start_len &&
 844                 (sb->buf[sb->len - 1 - trimlen] == '.'
 845                 || sb->buf[sb->len - 1 - trimlen] == '-'))
 846                 trimlen++;
 847         strbuf_remove(sb, sb->len - trimlen, trimlen);
 848 }
 849
 850 const char *format_subject(struct strbuf *sb, const char *msg,
 851                            const char *line_separator)
 852 {
 853         int first = 1;
 854
 855         for (;;) {
 856                 const char *line = msg;
 857                 int linelen = get_one_line(line);
 858
 859                 msg += linelen;
 860                 if (!linelen || is_blank_line(line, &linelen))
 861                         break;
 862
 863                 if (!sb)
 864                         continue;
 865                 strbuf_grow(sb, linelen + 2);
 866                 if (!first)
 867                         strbuf_addstr(sb, line_separator);
 868                 strbuf_add(sb, line, linelen);
 869                 first = 0;
 870         }
 871         return msg;
 872 }
 873
 874 static void parse_commit_message(struct format_commit_context *c)
 875 {
 876         const char *msg = c->message + c->message_off;
 877         const char *start = c->message;
 878
 879         msg = skip_blank_lines(msg);
 880         c->subject_off = msg - start;
 881
 882         msg = format_subject(NULL, msg, NULL);
 883         msg = skip_blank_lines(msg);
 884         c->body_off = msg - start;
 885
 886         c->commit_message_parsed = 1;
 887 }
 888
 889 static void strbuf_wrap(struct strbuf *sb, size_t pos,
 890                         size_t width, size_t indent1, size_t indent2)
 891 {
 892         struct strbuf tmp = STRBUF_INIT;
 893
 894         if (pos)
 895                 strbuf_add(&tmp, sb->buf, pos);
 896         strbuf_add_wrapped_text(&tmp, sb->buf + pos,
 897                                 (int) indent1, (int) indent2, (int) width);
 898         strbuf_swap(&tmp, sb);
 899         strbuf_release(&tmp);
 900 }
 901
 902 static void rewrap_message_tail(struct strbuf *sb,
 903                                 struct format_commit_context *c,
 904                                 size_t new_width, size_t new_indent1,
 905                                 size_t new_indent2)
 906 {
 907         if (c->width == new_width && c->indent1 == new_indent1 &&
 908             c->indent2 == new_indent2)
 909                 return;
 910         if (c->wrap_start < sb->len)
 911                 strbuf_wrap(sb, c->wrap_start, c->width, c->indent1, c->indent2);
 912         c->wrap_start = sb->len;
 913         c->width = new_width;
 914         c->indent1 = new_indent1;
 915         c->indent2 = new_indent2;
 916 }
 917
 918 static int format_reflog_person(struct strbuf *sb,
 919                                 char part,
 920                                 struct reflog_walk_info *log,
 921                                 const struct date_mode *dmode)
 922 {
 923         const char *ident;
 924
 925         if (!log)
 926                 return 2;
 927
 928         ident = get_reflog_ident(log);
 929         if (!ident)
 930                 return 2;
 931
 932         return format_person_part(sb, part, ident, strlen(ident), dmode);
 933 }
 934
 935 static size_t parse_color(struct strbuf *sb, /* in UTF-8 */
 936                           const char *placeholder,
 937                           struct format_commit_context *c)
 938 {
 939         const char *rest = placeholder;
 940         const char *basic_color = NULL;
 941
 942         if (placeholder[1] == '(') {
 943                 const char *begin = placeholder + 2;
 944                 const char *end = strchr(begin, ')');
 945                 char color[COLOR_MAXLEN];
 946
 947                 if (!end)
 948                         return 0;
 949
 950                 if (skip_prefix(begin, "auto,", &begin)) {
 951                         if (!want_color(c->pretty_ctx->color))
 952                                 return end - placeholder + 1;
 953                 } else if (skip_prefix(begin, "always,", &begin)) {
 954                         /* nothing to do; we do not respect want_color at all */
 955                 } else {
 956                         /* the default is the same as "auto" */
 957                         if (!want_color(c->pretty_ctx->color))
 958                                 return end - placeholder + 1;
 959                 }
 960
 961                 if (color_parse_mem(begin, end - begin, color) < 0)
 962                         die(_("unable to parse --pretty format"));
 963                 strbuf_addstr(sb, color);
 964                 return end - placeholder + 1;
 965         }
 966
 967         /*
 968          * We handle things like "%C(red)" above; for historical reasons, there
 969          * are a few colors that can be specified without parentheses (and
 970          * they cannot support things like "auto" or "always" at all).
 971          */
 972         if (skip_prefix(placeholder + 1, "red", &rest))
 973                 basic_color = GIT_COLOR_RED;
 974         else if (skip_prefix(placeholder + 1, "green", &rest))
 975                 basic_color = GIT_COLOR_GREEN;
 976         else if (skip_prefix(placeholder + 1, "blue", &rest))
 977                 basic_color = GIT_COLOR_BLUE;
 978         else if (skip_prefix(placeholder + 1, "reset", &rest))
 979                 basic_color = GIT_COLOR_RESET;
 980
 981         if (basic_color && want_color(c->pretty_ctx->color))
 982                 strbuf_addstr(sb, basic_color);
 983
 984         return rest - placeholder;
 985 }
 986
 987 static size_t parse_padding_placeholder(struct strbuf *sb,
 988                                         const char *placeholder,
 989                                         struct format_commit_context *c)
 990 {
 991         const char *ch = placeholder;
 992         enum flush_type flush_type;
 993         int to_column = 0;
 994
 995         switch (*ch++) {
 996         case '<':
 997                 flush_type = flush_right;
 998                 break;
 999         case '>':
1000                 if (*ch == '<') {
1001                         flush_type = flush_both;
1002                         ch++;
1003                 } else if (*ch == '>') {
1004                         flush_type = flush_left_and_steal;
1005                         ch++;
1006                 } else
1007                         flush_type = flush_left;
1008                 break;
1009         default:
1010                 return 0;
1011         }
1012
1013         /* the next value means "wide enough to that column" */
1014         if (*ch == '|') {
1015                 to_column = 1;
1016                 ch++;
1017         }
1018
1019         if (*ch == '(') {
1020                 const char *start = ch + 1;
1021                 const char *end = start + strcspn(start, ",)");
1022                 char *next;
1023                 int width;
1024                 if (!end || end == start)
1025                         return 0;
1026                 width = strtol(start, &next, 10);
1027                 if (next == start || width == 0)
1028                         return 0;
1029                 if (width < 0) {
1030                         if (to_column)
1031                                 width += term_columns();
1032                         if (width < 0)
1033                                 return 0;
1034                 }
1035                 c->padding = to_column ? -width : width;
1036                 c->flush_type = flush_type;
1037
1038                 if (*end == ',') {
1039                         start = end + 1;
1040                         end = strchr(start, ')');
1041                         if (!end || end == start)
1042                                 return 0;
1043                         if (starts_with(start, "trunc)"))
1044                                 c->truncate = trunc_right;
1045                         else if (starts_with(start, "ltrunc)"))
1046                                 c->truncate = trunc_left;
1047                         else if (starts_with(start, "mtrunc)"))
1048                                 c->truncate = trunc_middle;
1049                         else
1050                                 return 0;
1051                 } else
1052                         c->truncate = trunc_none;
1053
1054                 return end - placeholder + 1;
1055         }
1056         return 0;
1057 }
1058
1059 static int match_placeholder_arg(const char *to_parse, const char *candidate,
1060                                  const char **end)
1061 {
1062         const char *p;
1063
1064         if (!(skip_prefix(to_parse, candidate, &p)))
1065                 return 0;
1066         if (*p == ',') {
1067                 *end = p + 1;
1068                 return 1;
1069         }
1070         if (*p == ')') {
1071                 *end = p;
1072                 return 1;
1073         }
1074         return 0;
1075 }
1076
1077 static size_t format_commit_one(struct strbuf *sb, /* in UTF-8 */
1078                                 const char *placeholder,
1079                                 void *context)
1080 {
1081         struct format_commit_context *c = context;
1082         const struct commit *commit = c->commit;
1083         const char *msg = c->message;
1084         struct commit_list *p;
1085         const char *arg;
1086         int ch;
1087         char **slot;
1088
1089         /* these are independent of the commit */
1090         switch (placeholder[0]) {
1091         case 'C':
1092                 if (starts_with(placeholder + 1, "(auto)")) {
1093                         c->auto_color = want_color(c->pretty_ctx->color);
1094                         if (c->auto_color && sb->len)
1095                                 strbuf_addstr(sb, GIT_COLOR_RESET);
1096                         return 7; /* consumed 7 bytes, "C(auto)" */
1097                 } else {
1098                         int ret = parse_color(sb, placeholder, c);
1099                         if (ret)
1100                                 c->auto_color = 0;
1101                         /*
1102                          * Otherwise, we decided to treat %C<unknown>
1103                          * as a literal string, and the previous
1104                          * %C(auto) is still valid.
1105                          */
1106                         return ret;
1107                 }
1108         case 'n':               /* newline */
1109                 strbuf_addch(sb, '\n');
1110                 return 1;
1111         case 'x':
1112                 /* %x00 == NUL, %x0a == LF, etc. */
1113                 ch = hex2chr(placeholder + 1);
1114                 if (ch < 0)
1115                         return 0;
1116                 strbuf_addch(sb, ch);
1117                 return 3;
1118         case 'w':
1119                 if (placeholder[1] == '(') {
1120                         unsigned long width = 0, indent1 = 0, indent2 = 0;
1121                         char *next;
1122                         const char *start = placeholder + 2;
1123                         const char *end = strchr(start, ')');
1124                         if (!end)
1125                                 return 0;
1126                         if (end > start) {
1127                                 width = strtoul(start, &next, 10);
1128                                 if (*next == ',') {
1129                                         indent1 = strtoul(next + 1, &next, 10);
1130                                         if (*next == ',') {
1131                                                 indent2 = strtoul(next + 1,
1132                                                                  &next, 10);
1133                                         }
1134                                 }
1135                                 if (*next != ')')
1136                                         return 0;
1137                         }
1138                         rewrap_message_tail(sb, c, width, indent1, indent2);
1139                         return end - placeholder + 1;
1140                 } else
1141                         return 0;
1142
1143         case '<':
1144         case '>':
1145                 return parse_padding_placeholder(sb, placeholder, c);
1146         }
1147
1148         /* these depend on the commit */
1149         if (!commit->object.parsed)
1150                 parse_object(the_repository, &commit->object.oid);
1151
1152         switch (placeholder[0]) {
1153         case 'H':               /* commit hash */
1154                 strbuf_addstr(sb, diff_get_color(c->auto_color, DIFF_COMMIT));
1155                 strbuf_addstr(sb, oid_to_hex(&commit->object.oid));
1156                 strbuf_addstr(sb, diff_get_color(c->auto_color, DIFF_RESET));
1157                 return 1;
1158         case 'h':               /* abbreviated commit hash */
1159                 strbuf_addstr(sb, diff_get_color(c->auto_color, DIFF_COMMIT));
1160                 strbuf_add_unique_abbrev(sb, &commit->object.oid,
1161                                          c->pretty_ctx->abbrev);
1162                 strbuf_addstr(sb, diff_get_color(c->auto_color, DIFF_RESET));
1163                 return 1;
1164         case 'T':               /* tree hash */
1165                 strbuf_addstr(sb, oid_to_hex(get_commit_tree_oid(commit)));
1166                 return 1;
1167         case 't':               /* abbreviated tree hash */
1168                 strbuf_add_unique_abbrev(sb,
1169                                          get_commit_tree_oid(commit),
1170                                          c->pretty_ctx->abbrev);
1171                 return 1;
1172         case 'P':               /* parent hashes */
1173                 for (p = commit->parents; p; p = p->next) {
1174                         if (p != commit->parents)
1175                                 strbuf_addch(sb, ' ');
1176                         strbuf_addstr(sb, oid_to_hex(&p->item->object.oid));
1177                 }
1178                 return 1;
1179         case 'p':               /* abbreviated parent hashes */
1180                 for (p = commit->parents; p; p = p->next) {
1181                         if (p != commit->parents)
1182                                 strbuf_addch(sb, ' ');
1183                         strbuf_add_unique_abbrev(sb, &p->item->object.oid,
1184                                                  c->pretty_ctx->abbrev);
1185                 }
1186                 return 1;
1187         case 'm':               /* left/right/bottom */
1188                 strbuf_addstr(sb, get_revision_mark(NULL, commit));
1189                 return 1;
1190         case 'd':
1191                 load_ref_decorations(NULL, DECORATE_SHORT_REFS);
1192                 format_decorations(sb, commit, c->auto_color);
1193                 return 1;
1194         case 'D':
1195                 load_ref_decorations(NULL, DECORATE_SHORT_REFS);
1196                 format_decorations_extended(sb, commit, c->auto_color, "", ", ", "");
1197                 return 1;
1198         case 'S':               /* tag/branch like --source */
1199                 if (!(c->pretty_ctx->rev && c->pretty_ctx->rev->sources))
1200                         return 0;
1201                 slot = revision_sources_at(c->pretty_ctx->rev->sources, commit);
1202                 if (!(slot && *slot))
1203                         return 0;
1204                 strbuf_addstr(sb, *slot);
1205                 return 1;
1206         case 'g':               /* reflog info */
1207                 switch(placeholder[1]) {
1208                 case 'd':       /* reflog selector */
1209                 case 'D':
1210                         if (c->pretty_ctx->reflog_info)
1211                                 get_reflog_selector(sb,
1212                                                     c->pretty_ctx->reflog_info,
1213                                                     &c->pretty_ctx->date_mode,
1214                                                     c->pretty_ctx->date_mode_explicit,
1215                                                     (placeholder[1] == 'd'));
1216                         return 2;
1217                 case 's':       /* reflog message */
1218                         if (c->pretty_ctx->reflog_info)
1219                                 get_reflog_message(sb, c->pretty_ctx->reflog_info);
1220                         return 2;
1221                 case 'n':
1222                 case 'N':
1223                 case 'e':
1224                 case 'E':
1225                         return format_reflog_person(sb,
1226                                                     placeholder[1],
1227                                                     c->pretty_ctx->reflog_info,
1228                                                     &c->pretty_ctx->date_mode);
1229                 }
1230                 return 0;       /* unknown %g placeholder */
1231         case 'N':
1232                 if (c->pretty_ctx->notes_message) {
1233                         strbuf_addstr(sb, c->pretty_ctx->notes_message);
1234                         return 1;
1235                 }
1236                 return 0;
1237         }
1238
1239         if (placeholder[0] == 'G') {
1240                 if (!c->signature_check.result)
1241                         check_commit_signature(c->commit, &(c->signature_check));
1242                 switch (placeholder[1]) {
1243                 case 'G':
1244                         if (c->signature_check.gpg_output)
1245                                 strbuf_addstr(sb, c->signature_check.gpg_output);
1246                         break;
1247                 case '?':
1248                         switch (c->signature_check.result) {
1249                         case 'G':
1250                         case 'B':
1251                         case 'E':
1252                         case 'U':
1253                         case 'N':
1254                         case 'X':
1255                         case 'Y':
1256                         case 'R':
1257                                 strbuf_addch(sb, c->signature_check.result);
1258                         }
1259                         break;
1260                 case 'S':
1261                         if (c->signature_check.signer)
1262                                 strbuf_addstr(sb, c->signature_check.signer);
1263                         break;
1264                 case 'K':
1265                         if (c->signature_check.key)
1266                                 strbuf_addstr(sb, c->signature_check.key);
1267                         break;
1268                 case 'F':
1269                         if (c->signature_check.fingerprint)
1270                                 strbuf_addstr(sb, c->signature_check.fingerprint);
1271                         break;
1272                 case 'P':
1273                         if (c->signature_check.primary_key_fingerprint)
1274                                 strbuf_addstr(sb, c->signature_check.primary_key_fingerprint);
1275                         break;
1276                 default:
1277                         return 0;
1278                 }
1279                 return 2;
1280         }
1281
1282
1283         /* For the rest we have to parse the commit header. */
1284         if (!c->commit_header_parsed)
1285                 parse_commit_header(c);
1286
1287         switch (placeholder[0]) {
1288         case 'a':       /* author ... */
1289                 return format_person_part(sb, placeholder[1],
1290                                    msg + c->author.off, c->author.len,
1291                                    &c->pretty_ctx->date_mode);
1292         case 'c':       /* committer ... */
1293                 return format_person_part(sb, placeholder[1],
1294                                    msg + c->committer.off, c->committer.len,
1295                                    &c->pretty_ctx->date_mode);
1296         case 'e':       /* encoding */
1297                 if (c->commit_encoding)
1298                         strbuf_addstr(sb, c->commit_encoding);
1299                 return 1;
1300         case 'B':       /* raw body */
1301                 /* message_off is always left at the initial newline */
1302                 strbuf_addstr(sb, msg + c->message_off + 1);
1303                 return 1;
1304         }
1305
1306         /* Now we need to parse the commit message. */
1307         if (!c->commit_message_parsed)
1308                 parse_commit_message(c);
1309
1310         switch (placeholder[0]) {
1311         case 's':       /* subject */
1312                 format_subject(sb, msg + c->subject_off, " ");
1313                 return 1;
1314         case 'f':       /* sanitized subject */
1315                 format_sanitized_subject(sb, msg + c->subject_off);
1316                 return 1;
1317         case 'b':       /* body */
1318                 strbuf_addstr(sb, msg + c->body_off);
1319                 return 1;
1320         }
1321
1322         if (skip_prefix(placeholder, "(trailers", &arg)) {
1323                 struct process_trailer_options opts = PROCESS_TRAILER_OPTIONS_INIT;
1324
1325                 opts.no_divider = 1;
1326
1327                 if (*arg == ':') {
1328                         arg++;
1329                         for (;;) {
1330                                 if (match_placeholder_arg(arg, "only", &arg))
1331                                         opts.only_trailers = 1;
1332                                 else if (match_placeholder_arg(arg, "unfold", &arg))
1333                                         opts.unfold = 1;
1334                                 else
1335                                         break;
1336                         }
1337                 }
1338                 if (*arg == ')') {
1339                         format_trailers_from_commit(sb, msg + c->subject_off, &opts);
1340                         return arg - placeholder + 1;
1341                 }
1342         }
1343
1344         return 0;       /* unknown placeholder */
1345 }
1346
1347 static size_t format_and_pad_commit(struct strbuf *sb, /* in UTF-8 */
1348                                     const char *placeholder,
1349                                     struct format_commit_context *c)
1350 {
1351         struct strbuf local_sb = STRBUF_INIT;
1352         int total_consumed = 0, len, padding = c->padding;
1353         if (padding < 0) {
1354                 const char *start = strrchr(sb->buf, '\n');
1355                 int occupied;
1356                 if (!start)
1357                         start = sb->buf;
1358                 occupied = utf8_strnwidth(start, -1, 1);
1359                 occupied += c->pretty_ctx->graph_width;
1360                 padding = (-padding) - occupied;
1361         }
1362         while (1) {
1363                 int modifier = *placeholder == 'C';
1364                 int consumed = format_commit_one(&local_sb, placeholder, c);
1365                 total_consumed += consumed;
1366
1367                 if (!modifier)
1368                         break;
1369
1370                 placeholder += consumed;
1371                 if (*placeholder != '%')
1372                         break;
1373                 placeholder++;
1374                 total_consumed++;
1375         }
1376         len = utf8_strnwidth(local_sb.buf, -1, 1);
1377
1378         if (c->flush_type == flush_left_and_steal) {
1379                 const char *ch = sb->buf + sb->len - 1;
1380                 while (len > padding && ch > sb->buf) {
1381                         const char *p;
1382                         if (*ch == ' ') {
1383                                 ch--;
1384                                 padding++;
1385                                 continue;
1386                         }
1387                         /* check for trailing ansi sequences */
1388                         if (*ch != 'm')
1389                                 break;
1390                         p = ch - 1;
1391                         while (ch - p < 10 && *p != '\033')
1392                                 p--;
1393                         if (*p != '\033' ||
1394                             ch + 1 - p != display_mode_esc_sequence_len(p))
1395                                 break;
1396                         /*
1397                          * got a good ansi sequence, put it back to
1398                          * local_sb as we're cutting sb
1399                          */
1400                         strbuf_insert(&local_sb, 0, p, ch + 1 - p);
1401                         ch = p - 1;
1402                 }
1403                 strbuf_setlen(sb, ch + 1 - sb->buf);
1404                 c->flush_type = flush_left;
1405         }
1406
1407         if (len > padding) {
1408                 switch (c->truncate) {
1409                 case trunc_left:
1410                         strbuf_utf8_replace(&local_sb,
1411                                             0, len - (padding - 2),
1412                                             "..");
1413                         break;
1414                 case trunc_middle:
1415                         strbuf_utf8_replace(&local_sb,
1416                                             padding / 2 - 1,
1417                                             len - (padding - 2),
1418                                             "..");
1419                         break;
1420                 case trunc_right:
1421                         strbuf_utf8_replace(&local_sb,
1422                                             padding - 2, len - (padding - 2),
1423                                             "..");
1424                         break;
1425                 case trunc_none:
1426                         break;
1427                 }
1428                 strbuf_addbuf(sb, &local_sb);
1429         } else {
1430                 int sb_len = sb->len, offset = 0;
1431                 if (c->flush_type == flush_left)
1432                         offset = padding - len;
1433                 else if (c->flush_type == flush_both)
1434                         offset = (padding - len) / 2;
1435                 /*
1436                  * we calculate padding in columns, now
1437                  * convert it back to chars
1438                  */
1439                 padding = padding - len + local_sb.len;
1440                 strbuf_addchars(sb, ' ', padding);
1441                 memcpy(sb->buf + sb_len + offset, local_sb.buf,
1442                        local_sb.len);
1443         }
1444         strbuf_release(&local_sb);
1445         c->flush_type = no_flush;
1446         return total_consumed;
1447 }
1448
1449 static size_t format_commit_item(struct strbuf *sb, /* in UTF-8 */
1450                                  const char *placeholder,
1451                                  void *context)
1452 {
1453         int consumed;
1454         size_t orig_len;
1455         enum {
1456                 NO_MAGIC,
1457                 ADD_LF_BEFORE_NON_EMPTY,
1458                 DEL_LF_BEFORE_EMPTY,
1459                 ADD_SP_BEFORE_NON_EMPTY
1460         } magic = NO_MAGIC;
1461
1462         switch (placeholder[0]) {
1463         case '-':
1464                 magic = DEL_LF_BEFORE_EMPTY;
1465                 break;
1466         case '+':
1467                 magic = ADD_LF_BEFORE_NON_EMPTY;
1468                 break;
1469         case ' ':
1470                 magic = ADD_SP_BEFORE_NON_EMPTY;
1471                 break;
1472         default:
1473                 break;
1474         }
1475         if (magic != NO_MAGIC)
1476                 placeholder++;
1477
1478         orig_len = sb->len;
1479         if (((struct format_commit_context *)context)->flush_type != no_flush)
1480                 consumed = format_and_pad_commit(sb, placeholder, context);
1481         else
1482                 consumed = format_commit_one(sb, placeholder, context);
1483         if (magic == NO_MAGIC)
1484                 return consumed;
1485
1486         if ((orig_len == sb->len) && magic == DEL_LF_BEFORE_EMPTY) {
1487                 while (sb->len && sb->buf[sb->len - 1] == '\n')
1488                         strbuf_setlen(sb, sb->len - 1);
1489         } else if (orig_len != sb->len) {
1490                 if (magic == ADD_LF_BEFORE_NON_EMPTY)
1491                         strbuf_insert(sb, orig_len, "\n", 1);
1492                 else if (magic == ADD_SP_BEFORE_NON_EMPTY)
1493                         strbuf_insert(sb, orig_len, " ", 1);
1494         }
1495         return consumed + 1;
1496 }
1497
1498 static size_t userformat_want_item(struct strbuf *sb, const char *placeholder,
1499                                    void *context)
1500 {
1501         struct userformat_want *w = context;
1502
1503         if (*placeholder == '+' || *placeholder == '-' || *placeholder == ' ')
1504                 placeholder++;
1505
1506         switch (*placeholder) {
1507         case 'N':
1508                 w->notes = 1;
1509                 break;
1510         case 'S':
1511                 w->source = 1;
1512                 break;
1513         }
1514         return 0;
1515 }
1516
1517 void userformat_find_requirements(const char *fmt, struct userformat_want *w)
1518 {
1519         struct strbuf dummy = STRBUF_INIT;
1520
1521         if (!fmt) {
1522                 if (!user_format)
1523                         return;
1524                 fmt = user_format;
1525         }
1526         strbuf_expand(&dummy, fmt, userformat_want_item, w);
1527         strbuf_release(&dummy);
1528 }
1529
1530 void format_commit_message(const struct commit *commit,
1531                            const char *format, struct strbuf *sb,
1532                            const struct pretty_print_context *pretty_ctx)
1533 {
1534         struct format_commit_context context;
1535         const char *output_enc = pretty_ctx->output_encoding;
1536         const char *utf8 = "UTF-8";
1537
1538         memset(&context, 0, sizeof(context));
1539         context.commit = commit;
1540         context.pretty_ctx = pretty_ctx;
1541         context.wrap_start = sb->len;
1542         /*
1543          * convert a commit message to UTF-8 first
1544          * as far as 'format_commit_item' assumes it in UTF-8
1545          */
1546         context.message = logmsg_reencode(commit,
1547                                           &context.commit_encoding,
1548                                           utf8);
1549
1550         strbuf_expand(sb, format, format_commit_item, &context);
1551         rewrap_message_tail(sb, &context, 0, 0, 0);
1552
1553         /* then convert a commit message to an actual output encoding */
1554         if (output_enc) {
1555                 if (same_encoding(utf8, output_enc))
1556                         output_enc = NULL;
1557         } else {
1558                 if (context.commit_encoding &&
1559                     !same_encoding(context.commit_encoding, utf8))
1560                         output_enc = context.commit_encoding;
1561         }
1562
1563         if (output_enc) {
1564                 size_t outsz;
1565                 char *out = reencode_string_len(sb->buf, sb->len,
1566                                                 output_enc, utf8, &outsz);
1567                 if (out)
1568                         strbuf_attach(sb, out, outsz, outsz + 1);
1569         }
1570
1571         free(context.commit_encoding);
1572         unuse_commit_buffer(commit, context.message);
1573 }
1574
1575 static void pp_header(struct pretty_print_context *pp,
1576                       const char *encoding,
1577                       const struct commit *commit,
1578                       const char **msg_p,
1579                       struct strbuf *sb)
1580 {
1581         int parents_shown = 0;
1582
1583         for (;;) {
1584                 const char *name, *line = *msg_p;
1585                 int linelen = get_one_line(*msg_p);
1586
1587                 if (!linelen)
1588                         return;
1589                 *msg_p += linelen;
1590
1591                 if (linelen == 1)
1592                         /* End of header */
1593                         return;
1594
1595                 if (pp->fmt == CMIT_FMT_RAW) {
1596                         strbuf_add(sb, line, linelen);
1597                         continue;
1598                 }
1599
1600                 if (starts_with(line, "parent ")) {
1601                         if (linelen != the_hash_algo->hexsz + 8)
1602                                 die("bad parent line in commit");
1603                         continue;
1604                 }
1605
1606                 if (!parents_shown) {
1607                         unsigned num = commit_list_count(commit->parents);
1608                         /* with enough slop */
1609                         strbuf_grow(sb, num * (GIT_MAX_HEXSZ + 10) + 20);
1610                         add_merge_info(pp, sb, commit);
1611                         parents_shown = 1;
1612                 }
1613
1614                 /*
1615                  * MEDIUM == DEFAULT shows only author with dates.
1616                  * FULL shows both authors but not dates.
1617                  * FULLER shows both authors and dates.
1618                  */
1619                 if (skip_prefix(line, "author ", &name)) {
1620                         strbuf_grow(sb, linelen + 80);
1621                         pp_user_info(pp, "Author", sb, name, encoding);
1622                 }
1623                 if (skip_prefix(line, "committer ", &name) &&
1624                     (pp->fmt == CMIT_FMT_FULL || pp->fmt == CMIT_FMT_FULLER)) {
1625                         strbuf_grow(sb, linelen + 80);
1626                         pp_user_info(pp, "Commit", sb, name, encoding);
1627                 }
1628         }
1629 }
1630
1631 void pp_title_line(struct pretty_print_context *pp,
1632                    const char **msg_p,
1633                    struct strbuf *sb,
1634                    const char *encoding,
1635                    int need_8bit_cte)
1636 {
1637         static const int max_length = 78; /* per rfc2047 */
1638         struct strbuf title;
1639
1640         strbuf_init(&title, 80);
1641         *msg_p = format_subject(&title, *msg_p,
1642                                 pp->preserve_subject ? "\n" : " ");
1643
1644         strbuf_grow(sb, title.len + 1024);
1645         if (pp->print_email_subject) {
1646                 if (pp->rev)
1647                         fmt_output_email_subject(sb, pp->rev);
1648                 if (needs_rfc2047_encoding(title.buf, title.len, RFC2047_SUBJECT))
1649                         add_rfc2047(sb, title.buf, title.len,
1650                                                 encoding, RFC2047_SUBJECT);
1651                 else
1652                         strbuf_add_wrapped_bytes(sb, title.buf, title.len,
1653                                          -last_line_length(sb), 1, max_length);
1654         } else {
1655                 strbuf_addbuf(sb, &title);
1656         }
1657         strbuf_addch(sb, '\n');
1658
1659         if (need_8bit_cte == 0) {
1660                 int i;
1661                 for (i = 0; i < pp->in_body_headers.nr; i++) {
1662                         if (has_non_ascii(pp->in_body_headers.items[i].string)) {
1663                                 need_8bit_cte = 1;
1664                                 break;
1665                         }
1666                 }
1667         }
1668
1669         if (need_8bit_cte > 0) {
1670                 const char *header_fmt =
1671                         "MIME-Version: 1.0\n"
1672                         "Content-Type: text/plain; charset=%s\n"
1673                         "Content-Transfer-Encoding: 8bit\n";
1674                 strbuf_addf(sb, header_fmt, encoding);
1675         }
1676         if (pp->after_subject) {
1677                 strbuf_addstr(sb, pp->after_subject);
1678         }
1679         if (cmit_fmt_is_mail(pp->fmt)) {
1680                 strbuf_addch(sb, '\n');
1681         }
1682
1683         if (pp->in_body_headers.nr) {
1684                 int i;
1685                 for (i = 0; i < pp->in_body_headers.nr; i++) {
1686                         strbuf_addstr(sb, pp->in_body_headers.items[i].string);
1687                         free(pp->in_body_headers.items[i].string);
1688                 }
1689                 string_list_clear(&pp->in_body_headers, 0);
1690                 strbuf_addch(sb, '\n');
1691         }
1692
1693         strbuf_release(&title);
1694 }
1695
1696 static int pp_utf8_width(const char *start, const char *end)
1697 {
1698         int width = 0;
1699         size_t remain = end - start;
1700
1701         while (remain) {
1702                 int n = utf8_width(&start, &remain);
1703                 if (n < 0 || !start)
1704                         return -1;
1705                 width += n;
1706         }
1707         return width;
1708 }
1709
1710 static void strbuf_add_tabexpand(struct strbuf *sb, int tabwidth,
1711                                  const char *line, int linelen)
1712 {
1713         const char *tab;
1714
1715         while ((tab = memchr(line, '\t', linelen)) != NULL) {
1716                 int width = pp_utf8_width(line, tab);
1717
1718                 /*
1719                  * If it wasn't well-formed utf8, or it
1720                  * had characters with badly defined
1721                  * width (control characters etc), just
1722                  * give up on trying to align things.
1723                  */
1724                 if (width < 0)
1725                         break;
1726
1727                 /* Output the data .. */
1728                 strbuf_add(sb, line, tab - line);
1729
1730                 /* .. and the de-tabified tab */
1731                 strbuf_addchars(sb, ' ', tabwidth - (width % tabwidth));
1732
1733                 /* Skip over the printed part .. */
1734                 linelen -= tab + 1 - line;
1735                 line = tab + 1;
1736         }
1737
1738         /*
1739          * Print out everything after the last tab without
1740          * worrying about width - there's nothing more to
1741          * align.
1742          */
1743         strbuf_add(sb, line, linelen);
1744 }
1745
1746 /*
1747  * pp_handle_indent() prints out the intendation, and
1748  * the whole line (without the final newline), after
1749  * de-tabifying.
1750  */
1751 static void pp_handle_indent(struct pretty_print_context *pp,
1752                              struct strbuf *sb, int indent,
1753                              const char *line, int linelen)
1754 {
1755         strbuf_addchars(sb, ' ', indent);
1756         if (pp->expand_tabs_in_log)
1757                 strbuf_add_tabexpand(sb, pp->expand_tabs_in_log, line, linelen);
1758         else
1759                 strbuf_add(sb, line, linelen);
1760 }
1761
1762 static int is_mboxrd_from(const char *line, int len)
1763 {
1764         /*
1765          * a line matching /^From $/ here would only have len == 4
1766          * at this point because is_empty_line would've trimmed all
1767          * trailing space
1768          */
1769         return len > 4 && starts_with(line + strspn(line, ">"), "From ");
1770 }
1771
1772 void pp_remainder(struct pretty_print_context *pp,
1773                   const char **msg_p,
1774                   struct strbuf *sb,
1775                   int indent)
1776 {
1777         int first = 1;
1778         for (;;) {
1779                 const char *line = *msg_p;
1780                 int linelen = get_one_line(line);
1781                 *msg_p += linelen;
1782
1783                 if (!linelen)
1784                         break;
1785
1786                 if (is_blank_line(line, &linelen)) {
1787                         if (first)
1788                                 continue;
1789                         if (pp->fmt == CMIT_FMT_SHORT)
1790                                 break;
1791                 }
1792                 first = 0;
1793
1794                 strbuf_grow(sb, linelen + indent + 20);
1795                 if (indent)
1796                         pp_handle_indent(pp, sb, indent, line, linelen);
1797                 else if (pp->expand_tabs_in_log)
1798                         strbuf_add_tabexpand(sb, pp->expand_tabs_in_log,
1799                                              line, linelen);
1800                 else {
1801                         if (pp->fmt == CMIT_FMT_MBOXRD &&
1802                                         is_mboxrd_from(line, linelen))
1803                                 strbuf_addch(sb, '>');
1804
1805                         strbuf_add(sb, line, linelen);
1806                 }
1807                 strbuf_addch(sb, '\n');
1808         }
1809 }
1810
1811 void pretty_print_commit(struct pretty_print_context *pp,
1812                          const struct commit *commit,
1813                          struct strbuf *sb)
1814 {
1815         unsigned long beginning_of_body;
1816         int indent = 4;
1817         const char *msg;
1818         const char *reencoded;
1819         const char *encoding;
1820         int need_8bit_cte = pp->need_8bit_cte;
1821
1822         if (pp->fmt == CMIT_FMT_USERFORMAT) {
1823                 format_commit_message(commit, user_format, sb, pp);
1824                 return;
1825         }
1826
1827         encoding = get_log_output_encoding();
1828         msg = reencoded = logmsg_reencode(commit, NULL, encoding);
1829
1830         if (pp->fmt == CMIT_FMT_ONELINE || cmit_fmt_is_mail(pp->fmt))
1831                 indent = 0;
1832
1833         /*
1834          * We need to check and emit Content-type: to mark it
1835          * as 8-bit if we haven't done so.
1836          */
1837         if (cmit_fmt_is_mail(pp->fmt) && need_8bit_cte == 0) {
1838                 int i, ch, in_body;
1839
1840                 for (in_body = i = 0; (ch = msg[i]); i++) {
1841                         if (!in_body) {
1842                                 /* author could be non 7-bit ASCII but
1843                                  * the log may be so; skip over the
1844                                  * header part first.
1845                                  */
1846                                 if (ch == '\n' && msg[i+1] == '\n')
1847                                         in_body = 1;
1848                         }
1849                         else if (non_ascii(ch)) {
1850                                 need_8bit_cte = 1;
1851                                 break;
1852                         }
1853                 }
1854         }
1855
1856         pp_header(pp, encoding, commit, &msg, sb);
1857         if (pp->fmt != CMIT_FMT_ONELINE && !pp->print_email_subject) {
1858                 strbuf_addch(sb, '\n');
1859         }
1860
1861         /* Skip excess blank lines at the beginning of body, if any... */
1862         msg = skip_blank_lines(msg);
1863
1864         /* These formats treat the title line specially. */
1865         if (pp->fmt == CMIT_FMT_ONELINE || cmit_fmt_is_mail(pp->fmt))
1866                 pp_title_line(pp, &msg, sb, encoding, need_8bit_cte);
1867
1868         beginning_of_body = sb->len;
1869         if (pp->fmt != CMIT_FMT_ONELINE)
1870                 pp_remainder(pp, &msg, sb, indent);
1871         strbuf_rtrim(sb);
1872
1873         /* Make sure there is an EOLN for the non-oneline case */
1874         if (pp->fmt != CMIT_FMT_ONELINE)
1875                 strbuf_addch(sb, '\n');
1876
1877         /*
1878          * The caller may append additional body text in e-mail
1879          * format.  Make sure we did not strip the blank line
1880          * between the header and the body.
1881          */
1882         if (cmit_fmt_is_mail(pp->fmt) && sb->len <= beginning_of_body)
1883                 strbuf_addch(sb, '\n');
1884
1885         unuse_commit_buffer(commit, reencoded);
1886 }
1887
1888 void pp_commit_easy(enum cmit_fmt fmt, const struct commit *commit,
1889                     struct strbuf *sb)
1890 {
1891         struct pretty_print_context pp = {0};
1892         pp.fmt = fmt;
1893         pretty_print_commit(&pp, commit, sb);
1894 }