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 *repo_logmsg_reencode(struct repository *r,
 599                                  const struct commit *commit,
 600                                  char **commit_encoding,
 601                                  const char *output_encoding)
 602 {
 603         static const char *utf8 = "UTF-8";
 604         const char *use_encoding;
 605         char *encoding;
 606         const char *msg = repo_get_commit_buffer(r, commit, NULL);
 607         char *out;
 608
 609         if (!output_encoding || !*output_encoding) {
 610                 if (commit_encoding)
 611                         *commit_encoding = get_header(msg, "encoding");
 612                 return msg;
 613         }
 614         encoding = get_header(msg, "encoding");
 615         if (commit_encoding)
 616                 *commit_encoding = encoding;
 617         use_encoding = encoding ? encoding : utf8;
 618         if (same_encoding(use_encoding, output_encoding)) {
 619                 /*
 620                  * No encoding work to be done. If we have no encoding header
 621                  * at all, then there's nothing to do, and we can return the
 622                  * message verbatim (whether newly allocated or not).
 623                  */
 624                 if (!encoding)
 625                         return msg;
 626
 627                 /*
 628                  * Otherwise, we still want to munge the encoding header in the
 629                  * result, which will be done by modifying the buffer. If we
 630                  * are using a fresh copy, we can reuse it. But if we are using
 631                  * the cached copy from get_commit_buffer, we need to duplicate it
 632                  * to avoid munging the cached copy.
 633                  */
 634                 if (msg == get_cached_commit_buffer(r, commit, NULL))
 635                         out = xstrdup(msg);
 636                 else
 637                         out = (char *)msg;
 638         }
 639         else {
 640                 /*
 641                  * There's actual encoding work to do. Do the reencoding, which
 642                  * still leaves the header to be replaced in the next step. At
 643                  * this point, we are done with msg. If we allocated a fresh
 644                  * copy, we can free it.
 645                  */
 646                 out = reencode_string(msg, output_encoding, use_encoding);
 647                 if (out)
 648                         repo_unuse_commit_buffer(r, commit, msg);
 649         }
 650
 651         /*
 652          * This replacement actually consumes the buffer we hand it, so we do
 653          * not have to worry about freeing the old "out" here.
 654          */
 655         if (out)
 656                 out = replace_encoding_header(out, output_encoding);
 657
 658         if (!commit_encoding)
 659                 free(encoding);
 660         /*
 661          * If the re-encoding failed, out might be NULL here; in that
 662          * case we just return the commit message verbatim.
 663          */
 664         return out ? out : msg;
 665 }
 666
 667 static int mailmap_name(const char **email, size_t *email_len,
 668                         const char **name, size_t *name_len)
 669 {
 670         static struct string_list *mail_map;
 671         if (!mail_map) {
 672                 mail_map = xcalloc(1, sizeof(*mail_map));
 673                 read_mailmap(mail_map, NULL);
 674         }
 675         return mail_map->nr && map_user(mail_map, email, email_len, name, name_len);
 676 }
 677
 678 static size_t format_person_part(struct strbuf *sb, char part,
 679                                  const char *msg, int len,
 680                                  const struct date_mode *dmode)
 681 {
 682         /* currently all placeholders have same length */
 683         const int placeholder_len = 2;
 684         struct ident_split s;
 685         const char *name, *mail;
 686         size_t maillen, namelen;
 687
 688         if (split_ident_line(&s, msg, len) < 0)
 689                 goto skip;
 690
 691         name = s.name_begin;
 692         namelen = s.name_end - s.name_begin;
 693         mail = s.mail_begin;
 694         maillen = s.mail_end - s.mail_begin;
 695
 696         if (part == 'N' || part == 'E') /* mailmap lookup */
 697                 mailmap_name(&mail, &maillen, &name, &namelen);
 698         if (part == 'n' || part == 'N') {       /* name */
 699                 strbuf_add(sb, name, namelen);
 700                 return placeholder_len;
 701         }
 702         if (part == 'e' || part == 'E') {       /* email */
 703                 strbuf_add(sb, mail, maillen);
 704                 return placeholder_len;
 705         }
 706
 707         if (!s.date_begin)
 708                 goto skip;
 709
 710         if (part == 't') {      /* date, UNIX timestamp */
 711                 strbuf_add(sb, s.date_begin, s.date_end - s.date_begin);
 712                 return placeholder_len;
 713         }
 714
 715         switch (part) {
 716         case 'd':       /* date */
 717                 strbuf_addstr(sb, show_ident_date(&s, dmode));
 718                 return placeholder_len;
 719         case 'D':       /* date, RFC2822 style */
 720                 strbuf_addstr(sb, show_ident_date(&s, DATE_MODE(RFC2822)));
 721                 return placeholder_len;
 722         case 'r':       /* date, relative */
 723                 strbuf_addstr(sb, show_ident_date(&s, DATE_MODE(RELATIVE)));
 724                 return placeholder_len;
 725         case 'i':       /* date, ISO 8601-like */
 726                 strbuf_addstr(sb, show_ident_date(&s, DATE_MODE(ISO8601)));
 727                 return placeholder_len;
 728         case 'I':       /* date, ISO 8601 strict */
 729                 strbuf_addstr(sb, show_ident_date(&s, DATE_MODE(ISO8601_STRICT)));
 730                 return placeholder_len;
 731         }
 732
 733 skip:
 734         /*
 735          * reading from either a bogus commit, or a reflog entry with
 736          * %gn, %ge, etc.; 'sb' cannot be updated, but we still need
 737          * to compute a valid return value.
 738          */
 739         if (part == 'n' || part == 'e' || part == 't' || part == 'd'
 740             || part == 'D' || part == 'r' || part == 'i')
 741                 return placeholder_len;
 742
 743         return 0; /* unknown placeholder */
 744 }
 745
 746 struct chunk {
 747         size_t off;
 748         size_t len;
 749 };
 750
 751 enum flush_type {
 752         no_flush,
 753         flush_right,
 754         flush_left,
 755         flush_left_and_steal,
 756         flush_both
 757 };
 758
 759 enum trunc_type {
 760         trunc_none,
 761         trunc_left,
 762         trunc_middle,
 763         trunc_right
 764 };
 765
 766 struct format_commit_context {
 767         const struct commit *commit;
 768         const struct pretty_print_context *pretty_ctx;
 769         unsigned commit_header_parsed:1;
 770         unsigned commit_message_parsed:1;
 771         struct signature_check signature_check;
 772         enum flush_type flush_type;
 773         enum trunc_type truncate;
 774         const char *message;
 775         char *commit_encoding;
 776         size_t width, indent1, indent2;
 777         int auto_color;
 778         int padding;
 779
 780         /* These offsets are relative to the start of the commit message. */
 781         struct chunk author;
 782         struct chunk committer;
 783         size_t message_off;
 784         size_t subject_off;
 785         size_t body_off;
 786
 787         /* The following ones are relative to the result struct strbuf. */
 788         size_t wrap_start;
 789 };
 790
 791 static void parse_commit_header(struct format_commit_context *context)
 792 {
 793         const char *msg = context->message;
 794         int i;
 795
 796         for (i = 0; msg[i]; i++) {
 797                 const char *name;
 798                 int eol;
 799                 for (eol = i; msg[eol] && msg[eol] != '\n'; eol++)
 800                         ; /* do nothing */
 801
 802                 if (i == eol) {
 803                         break;
 804                 } else if (skip_prefix(msg + i, "author ", &name)) {
 805                         context->author.off = name - msg;
 806                         context->author.len = msg + eol - name;
 807                 } else if (skip_prefix(msg + i, "committer ", &name)) {
 808                         context->committer.off = name - msg;
 809                         context->committer.len = msg + eol - name;
 810                 }
 811                 i = eol;
 812         }
 813         context->message_off = i;
 814         context->commit_header_parsed = 1;
 815 }
 816
 817 static int istitlechar(char c)
 818 {
 819         return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') ||
 820                 (c >= '0' && c <= '9') || c == '.' || c == '_';
 821 }
 822
 823 static void format_sanitized_subject(struct strbuf *sb, const char *msg)
 824 {
 825         size_t trimlen;
 826         size_t start_len = sb->len;
 827         int space = 2;
 828
 829         for (; *msg && *msg != '\n'; msg++) {
 830                 if (istitlechar(*msg)) {
 831                         if (space == 1)
 832                                 strbuf_addch(sb, '-');
 833                         space = 0;
 834                         strbuf_addch(sb, *msg);
 835                         if (*msg == '.')
 836                                 while (*(msg+1) == '.')
 837                                         msg++;
 838                 } else
 839                         space |= 1;
 840         }
 841
 842         /* trim any trailing '.' or '-' characters */
 843         trimlen = 0;
 844         while (sb->len - trimlen > start_len &&
 845                 (sb->buf[sb->len - 1 - trimlen] == '.'
 846                 || sb->buf[sb->len - 1 - trimlen] == '-'))
 847                 trimlen++;
 848         strbuf_remove(sb, sb->len - trimlen, trimlen);
 849 }
 850
 851 const char *format_subject(struct strbuf *sb, const char *msg,
 852                            const char *line_separator)
 853 {
 854         int first = 1;
 855
 856         for (;;) {
 857                 const char *line = msg;
 858                 int linelen = get_one_line(line);
 859
 860                 msg += linelen;
 861                 if (!linelen || is_blank_line(line, &linelen))
 862                         break;
 863
 864                 if (!sb)
 865                         continue;
 866                 strbuf_grow(sb, linelen + 2);
 867                 if (!first)
 868                         strbuf_addstr(sb, line_separator);
 869                 strbuf_add(sb, line, linelen);
 870                 first = 0;
 871         }
 872         return msg;
 873 }
 874
 875 static void parse_commit_message(struct format_commit_context *c)
 876 {
 877         const char *msg = c->message + c->message_off;
 878         const char *start = c->message;
 879
 880         msg = skip_blank_lines(msg);
 881         c->subject_off = msg - start;
 882
 883         msg = format_subject(NULL, msg, NULL);
 884         msg = skip_blank_lines(msg);
 885         c->body_off = msg - start;
 886
 887         c->commit_message_parsed = 1;
 888 }
 889
 890 static void strbuf_wrap(struct strbuf *sb, size_t pos,
 891                         size_t width, size_t indent1, size_t indent2)
 892 {
 893         struct strbuf tmp = STRBUF_INIT;
 894
 895         if (pos)
 896                 strbuf_add(&tmp, sb->buf, pos);
 897         strbuf_add_wrapped_text(&tmp, sb->buf + pos,
 898                                 (int) indent1, (int) indent2, (int) width);
 899         strbuf_swap(&tmp, sb);
 900         strbuf_release(&tmp);
 901 }
 902
 903 static void rewrap_message_tail(struct strbuf *sb,
 904                                 struct format_commit_context *c,
 905                                 size_t new_width, size_t new_indent1,
 906                                 size_t new_indent2)
 907 {
 908         if (c->width == new_width && c->indent1 == new_indent1 &&
 909             c->indent2 == new_indent2)
 910                 return;
 911         if (c->wrap_start < sb->len)
 912                 strbuf_wrap(sb, c->wrap_start, c->width, c->indent1, c->indent2);
 913         c->wrap_start = sb->len;
 914         c->width = new_width;
 915         c->indent1 = new_indent1;
 916         c->indent2 = new_indent2;
 917 }
 918
 919 static int format_reflog_person(struct strbuf *sb,
 920                                 char part,
 921                                 struct reflog_walk_info *log,
 922                                 const struct date_mode *dmode)
 923 {
 924         const char *ident;
 925
 926         if (!log)
 927                 return 2;
 928
 929         ident = get_reflog_ident(log);
 930         if (!ident)
 931                 return 2;
 932
 933         return format_person_part(sb, part, ident, strlen(ident), dmode);
 934 }
 935
 936 static size_t parse_color(struct strbuf *sb, /* in UTF-8 */
 937                           const char *placeholder,
 938                           struct format_commit_context *c)
 939 {
 940         const char *rest = placeholder;
 941         const char *basic_color = NULL;
 942
 943         if (placeholder[1] == '(') {
 944                 const char *begin = placeholder + 2;
 945                 const char *end = strchr(begin, ')');
 946                 char color[COLOR_MAXLEN];
 947
 948                 if (!end)
 949                         return 0;
 950
 951                 if (skip_prefix(begin, "auto,", &begin)) {
 952                         if (!want_color(c->pretty_ctx->color))
 953                                 return end - placeholder + 1;
 954                 } else if (skip_prefix(begin, "always,", &begin)) {
 955                         /* nothing to do; we do not respect want_color at all */
 956                 } else {
 957                         /* the default is the same as "auto" */
 958                         if (!want_color(c->pretty_ctx->color))
 959                                 return end - placeholder + 1;
 960                 }
 961
 962                 if (color_parse_mem(begin, end - begin, color) < 0)
 963                         die(_("unable to parse --pretty format"));
 964                 strbuf_addstr(sb, color);
 965                 return end - placeholder + 1;
 966         }
 967
 968         /*
 969          * We handle things like "%C(red)" above; for historical reasons, there
 970          * are a few colors that can be specified without parentheses (and
 971          * they cannot support things like "auto" or "always" at all).
 972          */
 973         if (skip_prefix(placeholder + 1, "red", &rest))
 974                 basic_color = GIT_COLOR_RED;
 975         else if (skip_prefix(placeholder + 1, "green", &rest))
 976                 basic_color = GIT_COLOR_GREEN;
 977         else if (skip_prefix(placeholder + 1, "blue", &rest))
 978                 basic_color = GIT_COLOR_BLUE;
 979         else if (skip_prefix(placeholder + 1, "reset", &rest))
 980                 basic_color = GIT_COLOR_RESET;
 981
 982         if (basic_color && want_color(c->pretty_ctx->color))
 983                 strbuf_addstr(sb, basic_color);
 984
 985         return rest - placeholder;
 986 }
 987
 988 static size_t parse_padding_placeholder(struct strbuf *sb,
 989                                         const char *placeholder,
 990                                         struct format_commit_context *c)
 991 {
 992         const char *ch = placeholder;
 993         enum flush_type flush_type;
 994         int to_column = 0;
 995
 996         switch (*ch++) {
 997         case '<':
 998                 flush_type = flush_right;
 999                 break;
1000         case '>':
1001                 if (*ch == '<') {
1002                         flush_type = flush_both;
1003                         ch++;
1004                 } else if (*ch == '>') {
1005                         flush_type = flush_left_and_steal;
1006                         ch++;
1007                 } else
1008                         flush_type = flush_left;
1009                 break;
1010         default:
1011                 return 0;
1012         }
1013
1014         /* the next value means "wide enough to that column" */
1015         if (*ch == '|') {
1016                 to_column = 1;
1017                 ch++;
1018         }
1019
1020         if (*ch == '(') {
1021                 const char *start = ch + 1;
1022                 const char *end = start + strcspn(start, ",)");
1023                 char *next;
1024                 int width;
1025                 if (!end || end == start)
1026                         return 0;
1027                 width = strtol(start, &next, 10);
1028                 if (next == start || width == 0)
1029                         return 0;
1030                 if (width < 0) {
1031                         if (to_column)
1032                                 width += term_columns();
1033                         if (width < 0)
1034                                 return 0;
1035                 }
1036                 c->padding = to_column ? -width : width;
1037                 c->flush_type = flush_type;
1038
1039                 if (*end == ',') {
1040                         start = end + 1;
1041                         end = strchr(start, ')');
1042                         if (!end || end == start)
1043                                 return 0;
1044                         if (starts_with(start, "trunc)"))
1045                                 c->truncate = trunc_right;
1046                         else if (starts_with(start, "ltrunc)"))
1047                                 c->truncate = trunc_left;
1048                         else if (starts_with(start, "mtrunc)"))
1049                                 c->truncate = trunc_middle;
1050                         else
1051                                 return 0;
1052                 } else
1053                         c->truncate = trunc_none;
1054
1055                 return end - placeholder + 1;
1056         }
1057         return 0;
1058 }
1059
1060 static int match_placeholder_arg(const char *to_parse, const char *candidate,
1061                                  const char **end)
1062 {
1063         const char *p;
1064
1065         if (!(skip_prefix(to_parse, candidate, &p)))
1066                 return 0;
1067         if (*p == ',') {
1068                 *end = p + 1;
1069                 return 1;
1070         }
1071         if (*p == ')') {
1072                 *end = p;
1073                 return 1;
1074         }
1075         return 0;
1076 }
1077
1078 static size_t format_commit_one(struct strbuf *sb, /* in UTF-8 */
1079                                 const char *placeholder,
1080                                 void *context)
1081 {
1082         struct format_commit_context *c = context;
1083         const struct commit *commit = c->commit;
1084         const char *msg = c->message;
1085         struct commit_list *p;
1086         const char *arg;
1087         int ch;
1088         char **slot;
1089
1090         /* these are independent of the commit */
1091         switch (placeholder[0]) {
1092         case 'C':
1093                 if (starts_with(placeholder + 1, "(auto)")) {
1094                         c->auto_color = want_color(c->pretty_ctx->color);
1095                         if (c->auto_color && sb->len)
1096                                 strbuf_addstr(sb, GIT_COLOR_RESET);
1097                         return 7; /* consumed 7 bytes, "C(auto)" */
1098                 } else {
1099                         int ret = parse_color(sb, placeholder, c);
1100                         if (ret)
1101                                 c->auto_color = 0;
1102                         /*
1103                          * Otherwise, we decided to treat %C<unknown>
1104                          * as a literal string, and the previous
1105                          * %C(auto) is still valid.
1106                          */
1107                         return ret;
1108                 }
1109         case 'n':               /* newline */
1110                 strbuf_addch(sb, '\n');
1111                 return 1;
1112         case 'x':
1113                 /* %x00 == NUL, %x0a == LF, etc. */
1114                 ch = hex2chr(placeholder + 1);
1115                 if (ch < 0)
1116                         return 0;
1117                 strbuf_addch(sb, ch);
1118                 return 3;
1119         case 'w':
1120                 if (placeholder[1] == '(') {
1121                         unsigned long width = 0, indent1 = 0, indent2 = 0;
1122                         char *next;
1123                         const char *start = placeholder + 2;
1124                         const char *end = strchr(start, ')');
1125                         if (!end)
1126                                 return 0;
1127                         if (end > start) {
1128                                 width = strtoul(start, &next, 10);
1129                                 if (*next == ',') {
1130                                         indent1 = strtoul(next + 1, &next, 10);
1131                                         if (*next == ',') {
1132                                                 indent2 = strtoul(next + 1,
1133                                                                  &next, 10);
1134                                         }
1135                                 }
1136                                 if (*next != ')')
1137                                         return 0;
1138                         }
1139                         rewrap_message_tail(sb, c, width, indent1, indent2);
1140                         return end - placeholder + 1;
1141                 } else
1142                         return 0;
1143
1144         case '<':
1145         case '>':
1146                 return parse_padding_placeholder(sb, placeholder, c);
1147         }
1148
1149         /* these depend on the commit */
1150         if (!commit->object.parsed)
1151                 parse_object(the_repository, &commit->object.oid);
1152
1153         switch (placeholder[0]) {
1154         case 'H':               /* commit hash */
1155                 strbuf_addstr(sb, diff_get_color(c->auto_color, DIFF_COMMIT));
1156                 strbuf_addstr(sb, oid_to_hex(&commit->object.oid));
1157                 strbuf_addstr(sb, diff_get_color(c->auto_color, DIFF_RESET));
1158                 return 1;
1159         case 'h':               /* abbreviated commit hash */
1160                 strbuf_addstr(sb, diff_get_color(c->auto_color, DIFF_COMMIT));
1161                 strbuf_add_unique_abbrev(sb, &commit->object.oid,
1162                                          c->pretty_ctx->abbrev);
1163                 strbuf_addstr(sb, diff_get_color(c->auto_color, DIFF_RESET));
1164                 return 1;
1165         case 'T':               /* tree hash */
1166                 strbuf_addstr(sb, oid_to_hex(get_commit_tree_oid(commit)));
1167                 return 1;
1168         case 't':               /* abbreviated tree hash */
1169                 strbuf_add_unique_abbrev(sb,
1170                                          get_commit_tree_oid(commit),
1171                                          c->pretty_ctx->abbrev);
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, oid_to_hex(&p->item->object.oid));
1178                 }
1179                 return 1;
1180         case 'p':               /* abbreviated parent hashes */
1181                 for (p = commit->parents; p; p = p->next) {
1182                         if (p != commit->parents)
1183                                 strbuf_addch(sb, ' ');
1184                         strbuf_add_unique_abbrev(sb, &p->item->object.oid,
1185                                                  c->pretty_ctx->abbrev);
1186                 }
1187                 return 1;
1188         case 'm':               /* left/right/bottom */
1189                 strbuf_addstr(sb, get_revision_mark(NULL, commit));
1190                 return 1;
1191         case 'd':
1192                 load_ref_decorations(NULL, DECORATE_SHORT_REFS);
1193                 format_decorations(sb, commit, c->auto_color);
1194                 return 1;
1195         case 'D':
1196                 load_ref_decorations(NULL, DECORATE_SHORT_REFS);
1197                 format_decorations_extended(sb, commit, c->auto_color, "", ", ", "");
1198                 return 1;
1199         case 'S':               /* tag/branch like --source */
1200                 if (!(c->pretty_ctx->rev && c->pretty_ctx->rev->sources))
1201                         return 0;
1202                 slot = revision_sources_at(c->pretty_ctx->rev->sources, commit);
1203                 if (!(slot && *slot))
1204                         return 0;
1205                 strbuf_addstr(sb, *slot);
1206                 return 1;
1207         case 'g':               /* reflog info */
1208                 switch(placeholder[1]) {
1209                 case 'd':       /* reflog selector */
1210                 case 'D':
1211                         if (c->pretty_ctx->reflog_info)
1212                                 get_reflog_selector(sb,
1213                                                     c->pretty_ctx->reflog_info,
1214                                                     &c->pretty_ctx->date_mode,
1215                                                     c->pretty_ctx->date_mode_explicit,
1216                                                     (placeholder[1] == 'd'));
1217                         return 2;
1218                 case 's':       /* reflog message */
1219                         if (c->pretty_ctx->reflog_info)
1220                                 get_reflog_message(sb, c->pretty_ctx->reflog_info);
1221                         return 2;
1222                 case 'n':
1223                 case 'N':
1224                 case 'e':
1225                 case 'E':
1226                         return format_reflog_person(sb,
1227                                                     placeholder[1],
1228                                                     c->pretty_ctx->reflog_info,
1229                                                     &c->pretty_ctx->date_mode);
1230                 }
1231                 return 0;       /* unknown %g placeholder */
1232         case 'N':
1233                 if (c->pretty_ctx->notes_message) {
1234                         strbuf_addstr(sb, c->pretty_ctx->notes_message);
1235                         return 1;
1236                 }
1237                 return 0;
1238         }
1239
1240         if (placeholder[0] == 'G') {
1241                 if (!c->signature_check.result)
1242                         check_commit_signature(c->commit, &(c->signature_check));
1243                 switch (placeholder[1]) {
1244                 case 'G':
1245                         if (c->signature_check.gpg_output)
1246                                 strbuf_addstr(sb, c->signature_check.gpg_output);
1247                         break;
1248                 case '?':
1249                         switch (c->signature_check.result) {
1250                         case 'G':
1251                         case 'B':
1252                         case 'E':
1253                         case 'U':
1254                         case 'N':
1255                         case 'X':
1256                         case 'Y':
1257                         case 'R':
1258                                 strbuf_addch(sb, c->signature_check.result);
1259                         }
1260                         break;
1261                 case 'S':
1262                         if (c->signature_check.signer)
1263                                 strbuf_addstr(sb, c->signature_check.signer);
1264                         break;
1265                 case 'K':
1266                         if (c->signature_check.key)
1267                                 strbuf_addstr(sb, c->signature_check.key);
1268                         break;
1269                 case 'F':
1270                         if (c->signature_check.fingerprint)
1271                                 strbuf_addstr(sb, c->signature_check.fingerprint);
1272                         break;
1273                 case 'P':
1274                         if (c->signature_check.primary_key_fingerprint)
1275                                 strbuf_addstr(sb, c->signature_check.primary_key_fingerprint);
1276                         break;
1277                 default:
1278                         return 0;
1279                 }
1280                 return 2;
1281         }
1282
1283
1284         /* For the rest we have to parse the commit header. */
1285         if (!c->commit_header_parsed)
1286                 parse_commit_header(c);
1287
1288         switch (placeholder[0]) {
1289         case 'a':       /* author ... */
1290                 return format_person_part(sb, placeholder[1],
1291                                    msg + c->author.off, c->author.len,
1292                                    &c->pretty_ctx->date_mode);
1293         case 'c':       /* committer ... */
1294                 return format_person_part(sb, placeholder[1],
1295                                    msg + c->committer.off, c->committer.len,
1296                                    &c->pretty_ctx->date_mode);
1297         case 'e':       /* encoding */
1298                 if (c->commit_encoding)
1299                         strbuf_addstr(sb, c->commit_encoding);
1300                 return 1;
1301         case 'B':       /* raw body */
1302                 /* message_off is always left at the initial newline */
1303                 strbuf_addstr(sb, msg + c->message_off + 1);
1304                 return 1;
1305         }
1306
1307         /* Now we need to parse the commit message. */
1308         if (!c->commit_message_parsed)
1309                 parse_commit_message(c);
1310
1311         switch (placeholder[0]) {
1312         case 's':       /* subject */
1313                 format_subject(sb, msg + c->subject_off, " ");
1314                 return 1;
1315         case 'f':       /* sanitized subject */
1316                 format_sanitized_subject(sb, msg + c->subject_off);
1317                 return 1;
1318         case 'b':       /* body */
1319                 strbuf_addstr(sb, msg + c->body_off);
1320                 return 1;
1321         }
1322
1323         if (skip_prefix(placeholder, "(trailers", &arg)) {
1324                 struct process_trailer_options opts = PROCESS_TRAILER_OPTIONS_INIT;
1325
1326                 opts.no_divider = 1;
1327
1328                 if (*arg == ':') {
1329                         arg++;
1330                         for (;;) {
1331                                 if (match_placeholder_arg(arg, "only", &arg))
1332                                         opts.only_trailers = 1;
1333                                 else if (match_placeholder_arg(arg, "unfold", &arg))
1334                                         opts.unfold = 1;
1335                                 else
1336                                         break;
1337                         }
1338                 }
1339                 if (*arg == ')') {
1340                         format_trailers_from_commit(sb, msg + c->subject_off, &opts);
1341                         return arg - placeholder + 1;
1342                 }
1343         }
1344
1345         return 0;       /* unknown placeholder */
1346 }
1347
1348 static size_t format_and_pad_commit(struct strbuf *sb, /* in UTF-8 */
1349                                     const char *placeholder,
1350                                     struct format_commit_context *c)
1351 {
1352         struct strbuf local_sb = STRBUF_INIT;
1353         int total_consumed = 0, len, padding = c->padding;
1354         if (padding < 0) {
1355                 const char *start = strrchr(sb->buf, '\n');
1356                 int occupied;
1357                 if (!start)
1358                         start = sb->buf;
1359                 occupied = utf8_strnwidth(start, -1, 1);
1360                 occupied += c->pretty_ctx->graph_width;
1361                 padding = (-padding) - occupied;
1362         }
1363         while (1) {
1364                 int modifier = *placeholder == 'C';
1365                 int consumed = format_commit_one(&local_sb, placeholder, c);
1366                 total_consumed += consumed;
1367
1368                 if (!modifier)
1369                         break;
1370
1371                 placeholder += consumed;
1372                 if (*placeholder != '%')
1373                         break;
1374                 placeholder++;
1375                 total_consumed++;
1376         }
1377         len = utf8_strnwidth(local_sb.buf, -1, 1);
1378
1379         if (c->flush_type == flush_left_and_steal) {
1380                 const char *ch = sb->buf + sb->len - 1;
1381                 while (len > padding && ch > sb->buf) {
1382                         const char *p;
1383                         if (*ch == ' ') {
1384                                 ch--;
1385                                 padding++;
1386                                 continue;
1387                         }
1388                         /* check for trailing ansi sequences */
1389                         if (*ch != 'm')
1390                                 break;
1391                         p = ch - 1;
1392                         while (ch - p < 10 && *p != '\033')
1393                                 p--;
1394                         if (*p != '\033' ||
1395                             ch + 1 - p != display_mode_esc_sequence_len(p))
1396                                 break;
1397                         /*
1398                          * got a good ansi sequence, put it back to
1399                          * local_sb as we're cutting sb
1400                          */
1401                         strbuf_insert(&local_sb, 0, p, ch + 1 - p);
1402                         ch = p - 1;
1403                 }
1404                 strbuf_setlen(sb, ch + 1 - sb->buf);
1405                 c->flush_type = flush_left;
1406         }
1407
1408         if (len > padding) {
1409                 switch (c->truncate) {
1410                 case trunc_left:
1411                         strbuf_utf8_replace(&local_sb,
1412                                             0, len - (padding - 2),
1413                                             "..");
1414                         break;
1415                 case trunc_middle:
1416                         strbuf_utf8_replace(&local_sb,
1417                                             padding / 2 - 1,
1418                                             len - (padding - 2),
1419                                             "..");
1420                         break;
1421                 case trunc_right:
1422                         strbuf_utf8_replace(&local_sb,
1423                                             padding - 2, len - (padding - 2),
1424                                             "..");
1425                         break;
1426                 case trunc_none:
1427                         break;
1428                 }
1429                 strbuf_addbuf(sb, &local_sb);
1430         } else {
1431                 int sb_len = sb->len, offset = 0;
1432                 if (c->flush_type == flush_left)
1433                         offset = padding - len;
1434                 else if (c->flush_type == flush_both)
1435                         offset = (padding - len) / 2;
1436                 /*
1437                  * we calculate padding in columns, now
1438                  * convert it back to chars
1439                  */
1440                 padding = padding - len + local_sb.len;
1441                 strbuf_addchars(sb, ' ', padding);
1442                 memcpy(sb->buf + sb_len + offset, local_sb.buf,
1443                        local_sb.len);
1444         }
1445         strbuf_release(&local_sb);
1446         c->flush_type = no_flush;
1447         return total_consumed;
1448 }
1449
1450 static size_t format_commit_item(struct strbuf *sb, /* in UTF-8 */
1451                                  const char *placeholder,
1452                                  void *context)
1453 {
1454         int consumed;
1455         size_t orig_len;
1456         enum {
1457                 NO_MAGIC,
1458                 ADD_LF_BEFORE_NON_EMPTY,
1459                 DEL_LF_BEFORE_EMPTY,
1460                 ADD_SP_BEFORE_NON_EMPTY
1461         } magic = NO_MAGIC;
1462
1463         switch (placeholder[0]) {
1464         case '-':
1465                 magic = DEL_LF_BEFORE_EMPTY;
1466                 break;
1467         case '+':
1468                 magic = ADD_LF_BEFORE_NON_EMPTY;
1469                 break;
1470         case ' ':
1471                 magic = ADD_SP_BEFORE_NON_EMPTY;
1472                 break;
1473         default:
1474                 break;
1475         }
1476         if (magic != NO_MAGIC)
1477                 placeholder++;
1478
1479         orig_len = sb->len;
1480         if (((struct format_commit_context *)context)->flush_type != no_flush)
1481                 consumed = format_and_pad_commit(sb, placeholder, context);
1482         else
1483                 consumed = format_commit_one(sb, placeholder, context);
1484         if (magic == NO_MAGIC)
1485                 return consumed;
1486
1487         if ((orig_len == sb->len) && magic == DEL_LF_BEFORE_EMPTY) {
1488                 while (sb->len && sb->buf[sb->len - 1] == '\n')
1489                         strbuf_setlen(sb, sb->len - 1);
1490         } else if (orig_len != sb->len) {
1491                 if (magic == ADD_LF_BEFORE_NON_EMPTY)
1492                         strbuf_insert(sb, orig_len, "\n", 1);
1493                 else if (magic == ADD_SP_BEFORE_NON_EMPTY)
1494                         strbuf_insert(sb, orig_len, " ", 1);
1495         }
1496         return consumed + 1;
1497 }
1498
1499 static size_t userformat_want_item(struct strbuf *sb, const char *placeholder,
1500                                    void *context)
1501 {
1502         struct userformat_want *w = context;
1503
1504         if (*placeholder == '+' || *placeholder == '-' || *placeholder == ' ')
1505                 placeholder++;
1506
1507         switch (*placeholder) {
1508         case 'N':
1509                 w->notes = 1;
1510                 break;
1511         case 'S':
1512                 w->source = 1;
1513                 break;
1514         }
1515         return 0;
1516 }
1517
1518 void userformat_find_requirements(const char *fmt, struct userformat_want *w)
1519 {
1520         struct strbuf dummy = STRBUF_INIT;
1521
1522         if (!fmt) {
1523                 if (!user_format)
1524                         return;
1525                 fmt = user_format;
1526         }
1527         strbuf_expand(&dummy, fmt, userformat_want_item, w);
1528         strbuf_release(&dummy);
1529 }
1530
1531 void repo_format_commit_message(struct repository *r,
1532                                 const struct commit *commit,
1533                                 const char *format, struct strbuf *sb,
1534                                 const struct pretty_print_context *pretty_ctx)
1535 {
1536         struct format_commit_context context;
1537         const char *output_enc = pretty_ctx->output_encoding;
1538         const char *utf8 = "UTF-8";
1539
1540         memset(&context, 0, sizeof(context));
1541         context.commit = commit;
1542         context.pretty_ctx = pretty_ctx;
1543         context.wrap_start = sb->len;
1544         /*
1545          * convert a commit message to UTF-8 first
1546          * as far as 'format_commit_item' assumes it in UTF-8
1547          */
1548         context.message = repo_logmsg_reencode(r, commit,
1549                                                &context.commit_encoding,
1550                                                utf8);
1551
1552         strbuf_expand(sb, format, format_commit_item, &context);
1553         rewrap_message_tail(sb, &context, 0, 0, 0);
1554
1555         /* then convert a commit message to an actual output encoding */
1556         if (output_enc) {
1557                 if (same_encoding(utf8, output_enc))
1558                         output_enc = NULL;
1559         } else {
1560                 if (context.commit_encoding &&
1561                     !same_encoding(context.commit_encoding, utf8))
1562                         output_enc = context.commit_encoding;
1563         }
1564
1565         if (output_enc) {
1566                 size_t outsz;
1567                 char *out = reencode_string_len(sb->buf, sb->len,
1568                                                 output_enc, utf8, &outsz);
1569                 if (out)
1570                         strbuf_attach(sb, out, outsz, outsz + 1);
1571         }
1572
1573         free(context.commit_encoding);
1574         repo_unuse_commit_buffer(r, commit, context.message);
1575 }
1576
1577 static void pp_header(struct pretty_print_context *pp,
1578                       const char *encoding,
1579                       const struct commit *commit,
1580                       const char **msg_p,
1581                       struct strbuf *sb)
1582 {
1583         int parents_shown = 0;
1584
1585         for (;;) {
1586                 const char *name, *line = *msg_p;
1587                 int linelen = get_one_line(*msg_p);
1588
1589                 if (!linelen)
1590                         return;
1591                 *msg_p += linelen;
1592
1593                 if (linelen == 1)
1594                         /* End of header */
1595                         return;
1596
1597                 if (pp->fmt == CMIT_FMT_RAW) {
1598                         strbuf_add(sb, line, linelen);
1599                         continue;
1600                 }
1601
1602                 if (starts_with(line, "parent ")) {
1603                         if (linelen != the_hash_algo->hexsz + 8)
1604                                 die("bad parent line in commit");
1605                         continue;
1606                 }
1607
1608                 if (!parents_shown) {
1609                         unsigned num = commit_list_count(commit->parents);
1610                         /* with enough slop */
1611                         strbuf_grow(sb, num * (GIT_MAX_HEXSZ + 10) + 20);
1612                         add_merge_info(pp, sb, commit);
1613                         parents_shown = 1;
1614                 }
1615
1616                 /*
1617                  * MEDIUM == DEFAULT shows only author with dates.
1618                  * FULL shows both authors but not dates.
1619                  * FULLER shows both authors and dates.
1620                  */
1621                 if (skip_prefix(line, "author ", &name)) {
1622                         strbuf_grow(sb, linelen + 80);
1623                         pp_user_info(pp, "Author", sb, name, encoding);
1624                 }
1625                 if (skip_prefix(line, "committer ", &name) &&
1626                     (pp->fmt == CMIT_FMT_FULL || pp->fmt == CMIT_FMT_FULLER)) {
1627                         strbuf_grow(sb, linelen + 80);
1628                         pp_user_info(pp, "Commit", sb, name, encoding);
1629                 }
1630         }
1631 }
1632
1633 void pp_title_line(struct pretty_print_context *pp,
1634                    const char **msg_p,
1635                    struct strbuf *sb,
1636                    const char *encoding,
1637                    int need_8bit_cte)
1638 {
1639         static const int max_length = 78; /* per rfc2047 */
1640         struct strbuf title;
1641
1642         strbuf_init(&title, 80);
1643         *msg_p = format_subject(&title, *msg_p,
1644                                 pp->preserve_subject ? "\n" : " ");
1645
1646         strbuf_grow(sb, title.len + 1024);
1647         if (pp->print_email_subject) {
1648                 if (pp->rev)
1649                         fmt_output_email_subject(sb, pp->rev);
1650                 if (needs_rfc2047_encoding(title.buf, title.len, RFC2047_SUBJECT))
1651                         add_rfc2047(sb, title.buf, title.len,
1652                                                 encoding, RFC2047_SUBJECT);
1653                 else
1654                         strbuf_add_wrapped_bytes(sb, title.buf, title.len,
1655                                          -last_line_length(sb), 1, max_length);
1656         } else {
1657                 strbuf_addbuf(sb, &title);
1658         }
1659         strbuf_addch(sb, '\n');
1660
1661         if (need_8bit_cte == 0) {
1662                 int i;
1663                 for (i = 0; i < pp->in_body_headers.nr; i++) {
1664                         if (has_non_ascii(pp->in_body_headers.items[i].string)) {
1665                                 need_8bit_cte = 1;
1666                                 break;
1667                         }
1668                 }
1669         }
1670
1671         if (need_8bit_cte > 0) {
1672                 const char *header_fmt =
1673                         "MIME-Version: 1.0\n"
1674                         "Content-Type: text/plain; charset=%s\n"
1675                         "Content-Transfer-Encoding: 8bit\n";
1676                 strbuf_addf(sb, header_fmt, encoding);
1677         }
1678         if (pp->after_subject) {
1679                 strbuf_addstr(sb, pp->after_subject);
1680         }
1681         if (cmit_fmt_is_mail(pp->fmt)) {
1682                 strbuf_addch(sb, '\n');
1683         }
1684
1685         if (pp->in_body_headers.nr) {
1686                 int i;
1687                 for (i = 0; i < pp->in_body_headers.nr; i++) {
1688                         strbuf_addstr(sb, pp->in_body_headers.items[i].string);
1689                         free(pp->in_body_headers.items[i].string);
1690                 }
1691                 string_list_clear(&pp->in_body_headers, 0);
1692                 strbuf_addch(sb, '\n');
1693         }
1694
1695         strbuf_release(&title);
1696 }
1697
1698 static int pp_utf8_width(const char *start, const char *end)
1699 {
1700         int width = 0;
1701         size_t remain = end - start;
1702
1703         while (remain) {
1704                 int n = utf8_width(&start, &remain);
1705                 if (n < 0 || !start)
1706                         return -1;
1707                 width += n;
1708         }
1709         return width;
1710 }
1711
1712 static void strbuf_add_tabexpand(struct strbuf *sb, int tabwidth,
1713                                  const char *line, int linelen)
1714 {
1715         const char *tab;
1716
1717         while ((tab = memchr(line, '\t', linelen)) != NULL) {
1718                 int width = pp_utf8_width(line, tab);
1719
1720                 /*
1721                  * If it wasn't well-formed utf8, or it
1722                  * had characters with badly defined
1723                  * width (control characters etc), just
1724                  * give up on trying to align things.
1725                  */
1726                 if (width < 0)
1727                         break;
1728
1729                 /* Output the data .. */
1730                 strbuf_add(sb, line, tab - line);
1731
1732                 /* .. and the de-tabified tab */
1733                 strbuf_addchars(sb, ' ', tabwidth - (width % tabwidth));
1734
1735                 /* Skip over the printed part .. */
1736                 linelen -= tab + 1 - line;
1737                 line = tab + 1;
1738         }
1739
1740         /*
1741          * Print out everything after the last tab without
1742          * worrying about width - there's nothing more to
1743          * align.
1744          */
1745         strbuf_add(sb, line, linelen);
1746 }
1747
1748 /*
1749  * pp_handle_indent() prints out the intendation, and
1750  * the whole line (without the final newline), after
1751  * de-tabifying.
1752  */
1753 static void pp_handle_indent(struct pretty_print_context *pp,
1754                              struct strbuf *sb, int indent,
1755                              const char *line, int linelen)
1756 {
1757         strbuf_addchars(sb, ' ', indent);
1758         if (pp->expand_tabs_in_log)
1759                 strbuf_add_tabexpand(sb, pp->expand_tabs_in_log, line, linelen);
1760         else
1761                 strbuf_add(sb, line, linelen);
1762 }
1763
1764 static int is_mboxrd_from(const char *line, int len)
1765 {
1766         /*
1767          * a line matching /^From $/ here would only have len == 4
1768          * at this point because is_empty_line would've trimmed all
1769          * trailing space
1770          */
1771         return len > 4 && starts_with(line + strspn(line, ">"), "From ");
1772 }
1773
1774 void pp_remainder(struct pretty_print_context *pp,
1775                   const char **msg_p,
1776                   struct strbuf *sb,
1777                   int indent)
1778 {
1779         int first = 1;
1780         for (;;) {
1781                 const char *line = *msg_p;
1782                 int linelen = get_one_line(line);
1783                 *msg_p += linelen;
1784
1785                 if (!linelen)
1786                         break;
1787
1788                 if (is_blank_line(line, &linelen)) {
1789                         if (first)
1790                                 continue;
1791                         if (pp->fmt == CMIT_FMT_SHORT)
1792                                 break;
1793                 }
1794                 first = 0;
1795
1796                 strbuf_grow(sb, linelen + indent + 20);
1797                 if (indent)
1798                         pp_handle_indent(pp, sb, indent, line, linelen);
1799                 else if (pp->expand_tabs_in_log)
1800                         strbuf_add_tabexpand(sb, pp->expand_tabs_in_log,
1801                                              line, linelen);
1802                 else {
1803                         if (pp->fmt == CMIT_FMT_MBOXRD &&
1804                                         is_mboxrd_from(line, linelen))
1805                                 strbuf_addch(sb, '>');
1806
1807                         strbuf_add(sb, line, linelen);
1808                 }
1809                 strbuf_addch(sb, '\n');
1810         }
1811 }
1812
1813 void pretty_print_commit(struct pretty_print_context *pp,
1814                          const struct commit *commit,
1815                          struct strbuf *sb)
1816 {
1817         unsigned long beginning_of_body;
1818         int indent = 4;
1819         const char *msg;
1820         const char *reencoded;
1821         const char *encoding;
1822         int need_8bit_cte = pp->need_8bit_cte;
1823
1824         if (pp->fmt == CMIT_FMT_USERFORMAT) {
1825                 format_commit_message(commit, user_format, sb, pp);
1826                 return;
1827         }
1828
1829         encoding = get_log_output_encoding();
1830         msg = reencoded = logmsg_reencode(commit, NULL, encoding);
1831
1832         if (pp->fmt == CMIT_FMT_ONELINE || cmit_fmt_is_mail(pp->fmt))
1833                 indent = 0;
1834
1835         /*
1836          * We need to check and emit Content-type: to mark it
1837          * as 8-bit if we haven't done so.
1838          */
1839         if (cmit_fmt_is_mail(pp->fmt) && need_8bit_cte == 0) {
1840                 int i, ch, in_body;
1841
1842                 for (in_body = i = 0; (ch = msg[i]); i++) {
1843                         if (!in_body) {
1844                                 /* author could be non 7-bit ASCII but
1845                                  * the log may be so; skip over the
1846                                  * header part first.
1847                                  */
1848                                 if (ch == '\n' && msg[i+1] == '\n')
1849                                         in_body = 1;
1850                         }
1851                         else if (non_ascii(ch)) {
1852                                 need_8bit_cte = 1;
1853                                 break;
1854                         }
1855                 }
1856         }
1857
1858         pp_header(pp, encoding, commit, &msg, sb);
1859         if (pp->fmt != CMIT_FMT_ONELINE && !pp->print_email_subject) {
1860                 strbuf_addch(sb, '\n');
1861         }
1862
1863         /* Skip excess blank lines at the beginning of body, if any... */
1864         msg = skip_blank_lines(msg);
1865
1866         /* These formats treat the title line specially. */
1867         if (pp->fmt == CMIT_FMT_ONELINE || cmit_fmt_is_mail(pp->fmt))
1868                 pp_title_line(pp, &msg, sb, encoding, need_8bit_cte);
1869
1870         beginning_of_body = sb->len;
1871         if (pp->fmt != CMIT_FMT_ONELINE)
1872                 pp_remainder(pp, &msg, sb, indent);
1873         strbuf_rtrim(sb);
1874
1875         /* Make sure there is an EOLN for the non-oneline case */
1876         if (pp->fmt != CMIT_FMT_ONELINE)
1877                 strbuf_addch(sb, '\n');
1878
1879         /*
1880          * The caller may append additional body text in e-mail
1881          * format.  Make sure we did not strip the blank line
1882          * between the header and the body.
1883          */
1884         if (cmit_fmt_is_mail(pp->fmt) && sb->len <= beginning_of_body)
1885                 strbuf_addch(sb, '\n');
1886
1887         unuse_commit_buffer(commit, reencoded);
1888 }
1889
1890 void pp_commit_easy(enum cmit_fmt fmt, const struct commit *commit,
1891                     struct strbuf *sb)
1892 {
1893         struct pretty_print_context pp = {0};
1894         pp.fmt = fmt;
1895         pretty_print_commit(&pp, commit, sb);
1896 }