pretty.c

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