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
  13 static char *user_format;
  14
  15 static void save_user_format(struct rev_info *rev, const char *cp, int is_tformat)
  16 {
  17         free(user_format);
  18         user_format = xstrdup(cp);
  19         if (is_tformat)
  20                 rev->use_terminator = 1;
  21         rev->commit_format = CMIT_FMT_USERFORMAT;
  22 }
  23
  24 void get_commit_format(const char *arg, struct rev_info *rev)
  25 {
  26         int i;
  27         static struct cmt_fmt_map {
  28                 const char *n;
  29                 size_t cmp_len;
  30                 enum cmit_fmt v;
  31         } cmt_fmts[] = {
  32                 { "raw",        1,      CMIT_FMT_RAW },
  33                 { "medium",     1,      CMIT_FMT_MEDIUM },
  34                 { "short",      1,      CMIT_FMT_SHORT },
  35                 { "email",      1,      CMIT_FMT_EMAIL },
  36                 { "full",       5,      CMIT_FMT_FULL },
  37                 { "fuller",     5,      CMIT_FMT_FULLER },
  38                 { "oneline",    1,      CMIT_FMT_ONELINE },
  39         };
  40
  41         rev->use_terminator = 0;
  42         if (!arg || !*arg) {
  43                 rev->commit_format = CMIT_FMT_DEFAULT;
  44                 return;
  45         }
  46         if (!prefixcmp(arg, "format:") || !prefixcmp(arg, "tformat:")) {
  47                 save_user_format(rev, strchr(arg, ':') + 1, arg[0] == 't');
  48                 return;
  49         }
  50         for (i = 0; i < ARRAY_SIZE(cmt_fmts); i++) {
  51                 if (!strncmp(arg, cmt_fmts[i].n, cmt_fmts[i].cmp_len) &&
  52                     !strncmp(arg, cmt_fmts[i].n, strlen(arg))) {
  53                         if (cmt_fmts[i].v == CMIT_FMT_ONELINE)
  54                                 rev->use_terminator = 1;
  55                         rev->commit_format = cmt_fmts[i].v;
  56                         return;
  57                 }
  58         }
  59         if (strchr(arg, '%')) {
  60                 save_user_format(rev, arg, 1);
  61                 return;
  62         }
  63
  64         die("invalid --pretty format: %s", arg);
  65 }
  66
  67 /*
  68  * Generic support for pretty-printing the header
  69  */
  70 static int get_one_line(const char *msg)
  71 {
  72         int ret = 0;
  73
  74         for (;;) {
  75                 char c = *msg++;
  76                 if (!c)
  77                         break;
  78                 ret++;
  79                 if (c == '\n')
  80                         break;
  81         }
  82         return ret;
  83 }
  84
  85 /* High bit set, or ISO-2022-INT */
  86 int non_ascii(int ch)
  87 {
  88         return !isascii(ch) || ch == '\033';
  89 }
  90
  91 int has_non_ascii(const char *s)
  92 {
  93         int ch;
  94         if (!s)
  95                 return 0;
  96         while ((ch = *s++) != '\0') {
  97                 if (non_ascii(ch))
  98                         return 1;
  99         }
 100         return 0;
 101 }
 102
 103 static int is_rfc2047_special(char ch)
 104 {
 105         return (non_ascii(ch) || (ch == '=') || (ch == '?') || (ch == '_'));
 106 }
 107
 108 static void add_rfc2047(struct strbuf *sb, const char *line, int len,
 109                        const char *encoding)
 110 {
 111         int i, last;
 112
 113         for (i = 0; i < len; i++) {
 114                 int ch = line[i];
 115                 if (non_ascii(ch))
 116                         goto needquote;
 117                 if ((i + 1 < len) && (ch == '=' && line[i+1] == '?'))
 118                         goto needquote;
 119         }
 120         strbuf_add(sb, line, len);
 121         return;
 122
 123 needquote:
 124         strbuf_grow(sb, len * 3 + strlen(encoding) + 100);
 125         strbuf_addf(sb, "=?%s?q?", encoding);
 126         for (i = last = 0; i < len; i++) {
 127                 unsigned ch = line[i] & 0xFF;
 128                 /*
 129                  * We encode ' ' using '=20' even though rfc2047
 130                  * allows using '_' for readability.  Unfortunately,
 131                  * many programs do not understand this and just
 132                  * leave the underscore in place.
 133                  */
 134                 if (is_rfc2047_special(ch) || ch == ' ') {
 135                         strbuf_add(sb, line + last, i - last);
 136                         strbuf_addf(sb, "=%02X", ch);
 137                         last = i + 1;
 138                 }
 139         }
 140         strbuf_add(sb, line + last, len - last);
 141         strbuf_addstr(sb, "?=");
 142 }
 143
 144 void pp_user_info(const char *what, enum cmit_fmt fmt, struct strbuf *sb,
 145                   const char *line, enum date_mode dmode,
 146                   const char *encoding)
 147 {
 148         char *date;
 149         int namelen;
 150         unsigned long time;
 151         int tz;
 152
 153         if (fmt == CMIT_FMT_ONELINE)
 154                 return;
 155         date = strchr(line, '>');
 156         if (!date)
 157                 return;
 158         namelen = ++date - line;
 159         time = strtoul(date, &date, 10);
 160         tz = strtol(date, NULL, 10);
 161
 162         if (fmt == CMIT_FMT_EMAIL) {
 163                 char *name_tail = strchr(line, '<');
 164                 int display_name_length;
 165                 if (!name_tail)
 166                         return;
 167                 while (line < name_tail && isspace(name_tail[-1]))
 168                         name_tail--;
 169                 display_name_length = name_tail - line;
 170                 strbuf_addstr(sb, "From: ");
 171                 add_rfc2047(sb, line, display_name_length, encoding);
 172                 strbuf_add(sb, name_tail, namelen - display_name_length);
 173                 strbuf_addch(sb, '\n');
 174         } else {
 175                 strbuf_addf(sb, "%s: %.*s%.*s\n", what,
 176                               (fmt == CMIT_FMT_FULLER) ? 4 : 0,
 177                               "    ", namelen, line);
 178         }
 179         switch (fmt) {
 180         case CMIT_FMT_MEDIUM:
 181                 strbuf_addf(sb, "Date:   %s\n", show_date(time, tz, dmode));
 182                 break;
 183         case CMIT_FMT_EMAIL:
 184                 strbuf_addf(sb, "Date: %s\n", show_date(time, tz, DATE_RFC2822));
 185                 break;
 186         case CMIT_FMT_FULLER:
 187                 strbuf_addf(sb, "%sDate: %s\n", what, show_date(time, tz, dmode));
 188                 break;
 189         default:
 190                 /* notin' */
 191                 break;
 192         }
 193 }
 194
 195 static int is_empty_line(const char *line, int *len_p)
 196 {
 197         int len = *len_p;
 198         while (len && isspace(line[len-1]))
 199                 len--;
 200         *len_p = len;
 201         return !len;
 202 }
 203
 204 static const char *skip_empty_lines(const char *msg)
 205 {
 206         for (;;) {
 207                 int linelen = get_one_line(msg);
 208                 int ll = linelen;
 209                 if (!linelen)
 210                         break;
 211                 if (!is_empty_line(msg, &ll))
 212                         break;
 213                 msg += linelen;
 214         }
 215         return msg;
 216 }
 217
 218 static void add_merge_info(enum cmit_fmt fmt, struct strbuf *sb,
 219                         const struct commit *commit, int abbrev)
 220 {
 221         struct commit_list *parent = commit->parents;
 222
 223         if ((fmt == CMIT_FMT_ONELINE) || (fmt == CMIT_FMT_EMAIL) ||
 224             !parent || !parent->next)
 225                 return;
 226
 227         strbuf_addstr(sb, "Merge:");
 228
 229         while (parent) {
 230                 struct commit *p = parent->item;
 231                 const char *hex = NULL;
 232                 if (abbrev)
 233                         hex = find_unique_abbrev(p->object.sha1, abbrev);
 234                 if (!hex)
 235                         hex = sha1_to_hex(p->object.sha1);
 236                 parent = parent->next;
 237
 238                 strbuf_addf(sb, " %s", hex);
 239         }
 240         strbuf_addch(sb, '\n');
 241 }
 242
 243 static char *get_header(const struct commit *commit, const char *key)
 244 {
 245         int key_len = strlen(key);
 246         const char *line = commit->buffer;
 247
 248         for (;;) {
 249                 const char *eol = strchr(line, '\n'), *next;
 250
 251                 if (line == eol)
 252                         return NULL;
 253                 if (!eol) {
 254                         eol = line + strlen(line);
 255                         next = NULL;
 256                 } else
 257                         next = eol + 1;
 258                 if (eol - line > key_len &&
 259                     !strncmp(line, key, key_len) &&
 260                     line[key_len] == ' ') {
 261                         return xmemdupz(line + key_len + 1, eol - line - key_len - 1);
 262                 }
 263                 line = next;
 264         }
 265 }
 266
 267 static char *replace_encoding_header(char *buf, const char *encoding)
 268 {
 269         struct strbuf tmp = STRBUF_INIT;
 270         size_t start, len;
 271         char *cp = buf;
 272
 273         /* guess if there is an encoding header before a \n\n */
 274         while (strncmp(cp, "encoding ", strlen("encoding "))) {
 275                 cp = strchr(cp, '\n');
 276                 if (!cp || *++cp == '\n')
 277                         return buf;
 278         }
 279         start = cp - buf;
 280         cp = strchr(cp, '\n');
 281         if (!cp)
 282                 return buf; /* should not happen but be defensive */
 283         len = cp + 1 - (buf + start);
 284
 285         strbuf_attach(&tmp, buf, strlen(buf), strlen(buf) + 1);
 286         if (is_encoding_utf8(encoding)) {
 287                 /* we have re-coded to UTF-8; drop the header */
 288                 strbuf_remove(&tmp, start, len);
 289         } else {
 290                 /* just replaces XXXX in 'encoding XXXX\n' */
 291                 strbuf_splice(&tmp, start + strlen("encoding "),
 292                                           len - strlen("encoding \n"),
 293                                           encoding, strlen(encoding));
 294         }
 295         return strbuf_detach(&tmp, NULL);
 296 }
 297
 298 static char *logmsg_reencode(const struct commit *commit,
 299                              const char *output_encoding)
 300 {
 301         static const char *utf8 = "UTF-8";
 302         const char *use_encoding;
 303         char *encoding;
 304         char *out;
 305
 306         if (!*output_encoding)
 307                 return NULL;
 308         encoding = get_header(commit, "encoding");
 309         use_encoding = encoding ? encoding : utf8;
 310         if (!strcmp(use_encoding, output_encoding))
 311                 if (encoding) /* we'll strip encoding header later */
 312                         out = xstrdup(commit->buffer);
 313                 else
 314                         return NULL; /* nothing to do */
 315         else
 316                 out = reencode_string(commit->buffer,
 317                                       output_encoding, use_encoding);
 318         if (out)
 319                 out = replace_encoding_header(out, output_encoding);
 320
 321         free(encoding);
 322         return out;
 323 }
 324
 325 static int mailmap_name(char *email, int email_len, char *name, int name_len)
 326 {
 327         static struct string_list *mail_map;
 328         if (!mail_map) {
 329                 mail_map = xcalloc(1, sizeof(*mail_map));
 330                 read_mailmap(mail_map, NULL);
 331         }
 332         return mail_map->nr && map_user(mail_map, email, email_len, name, name_len);
 333 }
 334
 335 static size_t format_person_part(struct strbuf *sb, char part,
 336                                  const char *msg, int len, enum date_mode dmode)
 337 {
 338         /* currently all placeholders have same length */
 339         const int placeholder_len = 2;
 340         int start, end, tz = 0;
 341         unsigned long date = 0;
 342         char *ep;
 343         const char *name_start, *name_end, *mail_start, *mail_end, *msg_end = msg+len;
 344         char person_name[1024];
 345         char person_mail[1024];
 346
 347         /* advance 'end' to point to email start delimiter */
 348         for (end = 0; end < len && msg[end] != '<'; end++)
 349                 ; /* do nothing */
 350
 351         /*
 352          * When end points at the '<' that we found, it should have
 353          * matching '>' later, which means 'end' must be strictly
 354          * below len - 1.
 355          */
 356         if (end >= len - 2)
 357                 goto skip;
 358
 359         /* Seek for both name and email part */
 360         name_start = msg;
 361         name_end = msg+end;
 362         while (name_end > name_start && isspace(*(name_end-1)))
 363                 name_end--;
 364         mail_start = msg+end+1;
 365         mail_end = mail_start;
 366         while (mail_end < msg_end && *mail_end != '>')
 367                 mail_end++;
 368         if (mail_end == msg_end)
 369                 goto skip;
 370         end = mail_end-msg;
 371
 372         if (part == 'N' || part == 'E') { /* mailmap lookup */
 373                 strlcpy(person_name, name_start, name_end-name_start+1);
 374                 strlcpy(person_mail, mail_start, mail_end-mail_start+1);
 375                 mailmap_name(person_mail, sizeof(person_mail), person_name, sizeof(person_name));
 376                 name_start = person_name;
 377                 name_end = name_start + strlen(person_name);
 378                 mail_start = person_mail;
 379                 mail_end = mail_start +  strlen(person_mail);
 380         }
 381         if (part == 'n' || part == 'N') {       /* name */
 382                 strbuf_add(sb, name_start, name_end-name_start);
 383                 return placeholder_len;
 384         }
 385         if (part == 'e' || part == 'E') {       /* email */
 386                 strbuf_add(sb, mail_start, mail_end-mail_start);
 387                 return placeholder_len;
 388         }
 389
 390         /* advance 'start' to point to date start delimiter */
 391         for (start = end + 1; start < len && isspace(msg[start]); start++)
 392                 ; /* do nothing */
 393         if (start >= len)
 394                 goto skip;
 395         date = strtoul(msg + start, &ep, 10);
 396         if (msg + start == ep)
 397                 goto skip;
 398
 399         if (part == 't') {      /* date, UNIX timestamp */
 400                 strbuf_add(sb, msg + start, ep - (msg + start));
 401                 return placeholder_len;
 402         }
 403
 404         /* parse tz */
 405         for (start = ep - msg + 1; start < len && isspace(msg[start]); start++)
 406                 ; /* do nothing */
 407         if (start + 1 < len) {
 408                 tz = strtoul(msg + start + 1, NULL, 10);
 409                 if (msg[start] == '-')
 410                         tz = -tz;
 411         }
 412
 413         switch (part) {
 414         case 'd':       /* date */
 415                 strbuf_addstr(sb, show_date(date, tz, dmode));
 416                 return placeholder_len;
 417         case 'D':       /* date, RFC2822 style */
 418                 strbuf_addstr(sb, show_date(date, tz, DATE_RFC2822));
 419                 return placeholder_len;
 420         case 'r':       /* date, relative */
 421                 strbuf_addstr(sb, show_date(date, tz, DATE_RELATIVE));
 422                 return placeholder_len;
 423         case 'i':       /* date, ISO 8601 */
 424                 strbuf_addstr(sb, show_date(date, tz, DATE_ISO8601));
 425                 return placeholder_len;
 426         }
 427
 428 skip:
 429         /*
 430          * bogus commit, 'sb' cannot be updated, but we still need to
 431          * compute a valid return value.
 432          */
 433         if (part == 'n' || part == 'e' || part == 't' || part == 'd'
 434             || part == 'D' || part == 'r' || part == 'i')
 435                 return placeholder_len;
 436
 437         return 0; /* unknown placeholder */
 438 }
 439
 440 struct chunk {
 441         size_t off;
 442         size_t len;
 443 };
 444
 445 struct format_commit_context {
 446         const struct commit *commit;
 447         const struct pretty_print_context *pretty_ctx;
 448         unsigned commit_header_parsed:1;
 449         unsigned commit_message_parsed:1;
 450         size_t width, indent1, indent2;
 451
 452         /* These offsets are relative to the start of the commit message. */
 453         struct chunk author;
 454         struct chunk committer;
 455         struct chunk encoding;
 456         size_t message_off;
 457         size_t subject_off;
 458         size_t body_off;
 459
 460         /* The following ones are relative to the result struct strbuf. */
 461         struct chunk abbrev_commit_hash;
 462         struct chunk abbrev_tree_hash;
 463         struct chunk abbrev_parent_hashes;
 464         size_t wrap_start;
 465 };
 466
 467 static int add_again(struct strbuf *sb, struct chunk *chunk)
 468 {
 469         if (chunk->len) {
 470                 strbuf_adddup(sb, chunk->off, chunk->len);
 471                 return 1;
 472         }
 473
 474         /*
 475          * We haven't seen this chunk before.  Our caller is surely
 476          * going to add it the hard way now.  Remember the most likely
 477          * start of the to-be-added chunk: the current end of the
 478          * struct strbuf.
 479          */
 480         chunk->off = sb->len;
 481         return 0;
 482 }
 483
 484 static void parse_commit_header(struct format_commit_context *context)
 485 {
 486         const char *msg = context->commit->buffer;
 487         int i;
 488
 489         for (i = 0; msg[i]; i++) {
 490                 int eol;
 491                 for (eol = i; msg[eol] && msg[eol] != '\n'; eol++)
 492                         ; /* do nothing */
 493
 494                 if (i == eol) {
 495                         break;
 496                 } else if (!prefixcmp(msg + i, "author ")) {
 497                         context->author.off = i + 7;
 498                         context->author.len = eol - i - 7;
 499                 } else if (!prefixcmp(msg + i, "committer ")) {
 500                         context->committer.off = i + 10;
 501                         context->committer.len = eol - i - 10;
 502                 } else if (!prefixcmp(msg + i, "encoding ")) {
 503                         context->encoding.off = i + 9;
 504                         context->encoding.len = eol - i - 9;
 505                 }
 506                 i = eol;
 507         }
 508         context->message_off = i;
 509         context->commit_header_parsed = 1;
 510 }
 511
 512 static int istitlechar(char c)
 513 {
 514         return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') ||
 515                 (c >= '0' && c <= '9') || c == '.' || c == '_';
 516 }
 517
 518 static void format_sanitized_subject(struct strbuf *sb, const char *msg)
 519 {
 520         size_t trimlen;
 521         size_t start_len = sb->len;
 522         int space = 2;
 523
 524         for (; *msg && *msg != '\n'; msg++) {
 525                 if (istitlechar(*msg)) {
 526                         if (space == 1)
 527                                 strbuf_addch(sb, '-');
 528                         space = 0;
 529                         strbuf_addch(sb, *msg);
 530                         if (*msg == '.')
 531                                 while (*(msg+1) == '.')
 532                                         msg++;
 533                 } else
 534                         space |= 1;
 535         }
 536
 537         /* trim any trailing '.' or '-' characters */
 538         trimlen = 0;
 539         while (sb->len - trimlen > start_len &&
 540                 (sb->buf[sb->len - 1 - trimlen] == '.'
 541                 || sb->buf[sb->len - 1 - trimlen] == '-'))
 542                 trimlen++;
 543         strbuf_remove(sb, sb->len - trimlen, trimlen);
 544 }
 545
 546 const char *format_subject(struct strbuf *sb, const char *msg,
 547                            const char *line_separator)
 548 {
 549         int first = 1;
 550
 551         for (;;) {
 552                 const char *line = msg;
 553                 int linelen = get_one_line(line);
 554
 555                 msg += linelen;
 556                 if (!linelen || is_empty_line(line, &linelen))
 557                         break;
 558
 559                 if (!sb)
 560                         continue;
 561                 strbuf_grow(sb, linelen + 2);
 562                 if (!first)
 563                         strbuf_addstr(sb, line_separator);
 564                 strbuf_add(sb, line, linelen);
 565                 first = 0;
 566         }
 567         return msg;
 568 }
 569
 570 static void parse_commit_message(struct format_commit_context *c)
 571 {
 572         const char *msg = c->commit->buffer + c->message_off;
 573         const char *start = c->commit->buffer;
 574
 575         msg = skip_empty_lines(msg);
 576         c->subject_off = msg - start;
 577
 578         msg = format_subject(NULL, msg, NULL);
 579         msg = skip_empty_lines(msg);
 580         c->body_off = msg - start;
 581
 582         c->commit_message_parsed = 1;
 583 }
 584
 585 static void format_decoration(struct strbuf *sb, const struct commit *commit)
 586 {
 587         struct name_decoration *d;
 588         const char *prefix = " (";
 589
 590         load_ref_decorations(DECORATE_SHORT_REFS);
 591         d = lookup_decoration(&name_decoration, &commit->object);
 592         while (d) {
 593                 strbuf_addstr(sb, prefix);
 594                 prefix = ", ";
 595                 strbuf_addstr(sb, d->name);
 596                 d = d->next;
 597         }
 598         if (prefix[0] == ',')
 599                 strbuf_addch(sb, ')');
 600 }
 601
 602 static void strbuf_wrap(struct strbuf *sb, size_t pos,
 603                         size_t width, size_t indent1, size_t indent2)
 604 {
 605         struct strbuf tmp = STRBUF_INIT;
 606
 607         if (pos)
 608                 strbuf_add(&tmp, sb->buf, pos);
 609         strbuf_add_wrapped_text(&tmp, sb->buf + pos,
 610                                 (int) indent1, (int) indent2, (int) width);
 611         strbuf_swap(&tmp, sb);
 612         strbuf_release(&tmp);
 613 }
 614
 615 static void rewrap_message_tail(struct strbuf *sb,
 616                                 struct format_commit_context *c,
 617                                 size_t new_width, size_t new_indent1,
 618                                 size_t new_indent2)
 619 {
 620         if (c->width == new_width && c->indent1 == new_indent1 &&
 621             c->indent2 == new_indent2)
 622                 return;
 623         if (c->wrap_start < sb->len)
 624                 strbuf_wrap(sb, c->wrap_start, c->width, c->indent1, c->indent2);
 625         c->wrap_start = sb->len;
 626         c->width = new_width;
 627         c->indent1 = new_indent1;
 628         c->indent2 = new_indent2;
 629 }
 630
 631 static size_t format_commit_one(struct strbuf *sb, const char *placeholder,
 632                                 void *context)
 633 {
 634         struct format_commit_context *c = context;
 635         const struct commit *commit = c->commit;
 636         const char *msg = commit->buffer;
 637         struct commit_list *p;
 638         int h1, h2;
 639
 640         /* these are independent of the commit */
 641         switch (placeholder[0]) {
 642         case 'C':
 643                 if (placeholder[1] == '(') {
 644                         const char *end = strchr(placeholder + 2, ')');
 645                         char color[COLOR_MAXLEN];
 646                         if (!end)
 647                                 return 0;
 648                         color_parse_mem(placeholder + 2,
 649                                         end - (placeholder + 2),
 650                                         "--pretty format", color);
 651                         strbuf_addstr(sb, color);
 652                         return end - placeholder + 1;
 653                 }
 654                 if (!prefixcmp(placeholder + 1, "red")) {
 655                         strbuf_addstr(sb, GIT_COLOR_RED);
 656                         return 4;
 657                 } else if (!prefixcmp(placeholder + 1, "green")) {
 658                         strbuf_addstr(sb, GIT_COLOR_GREEN);
 659                         return 6;
 660                 } else if (!prefixcmp(placeholder + 1, "blue")) {
 661                         strbuf_addstr(sb, GIT_COLOR_BLUE);
 662                         return 5;
 663                 } else if (!prefixcmp(placeholder + 1, "reset")) {
 664                         strbuf_addstr(sb, GIT_COLOR_RESET);
 665                         return 6;
 666                 } else
 667                         return 0;
 668         case 'n':               /* newline */
 669                 strbuf_addch(sb, '\n');
 670                 return 1;
 671         case 'x':
 672                 /* %x00 == NUL, %x0a == LF, etc. */
 673                 if (0 <= (h1 = hexval_table[0xff & placeholder[1]]) &&
 674                     h1 <= 16 &&
 675                     0 <= (h2 = hexval_table[0xff & placeholder[2]]) &&
 676                     h2 <= 16) {
 677                         strbuf_addch(sb, (h1<<4)|h2);
 678                         return 3;
 679                 } else
 680                         return 0;
 681         case 'w':
 682                 if (placeholder[1] == '(') {
 683                         unsigned long width = 0, indent1 = 0, indent2 = 0;
 684                         char *next;
 685                         const char *start = placeholder + 2;
 686                         const char *end = strchr(start, ')');
 687                         if (!end)
 688                                 return 0;
 689                         if (end > start) {
 690                                 width = strtoul(start, &next, 10);
 691                                 if (*next == ',') {
 692                                         indent1 = strtoul(next + 1, &next, 10);
 693                                         if (*next == ',') {
 694                                                 indent2 = strtoul(next + 1,
 695                                                                  &next, 10);
 696                                         }
 697                                 }
 698                                 if (*next != ')')
 699                                         return 0;
 700                         }
 701                         rewrap_message_tail(sb, c, width, indent1, indent2);
 702                         return end - placeholder + 1;
 703                 } else
 704                         return 0;
 705         }
 706
 707         /* these depend on the commit */
 708         if (!commit->object.parsed)
 709                 parse_object(commit->object.sha1);
 710
 711         switch (placeholder[0]) {
 712         case 'H':               /* commit hash */
 713                 strbuf_addstr(sb, sha1_to_hex(commit->object.sha1));
 714                 return 1;
 715         case 'h':               /* abbreviated commit hash */
 716                 if (add_again(sb, &c->abbrev_commit_hash))
 717                         return 1;
 718                 strbuf_addstr(sb, find_unique_abbrev(commit->object.sha1,
 719                                                      DEFAULT_ABBREV));
 720                 c->abbrev_commit_hash.len = sb->len - c->abbrev_commit_hash.off;
 721                 return 1;
 722         case 'T':               /* tree hash */
 723                 strbuf_addstr(sb, sha1_to_hex(commit->tree->object.sha1));
 724                 return 1;
 725         case 't':               /* abbreviated tree hash */
 726                 if (add_again(sb, &c->abbrev_tree_hash))
 727                         return 1;
 728                 strbuf_addstr(sb, find_unique_abbrev(commit->tree->object.sha1,
 729                                                      DEFAULT_ABBREV));
 730                 c->abbrev_tree_hash.len = sb->len - c->abbrev_tree_hash.off;
 731                 return 1;
 732         case 'P':               /* parent hashes */
 733                 for (p = commit->parents; p; p = p->next) {
 734                         if (p != commit->parents)
 735                                 strbuf_addch(sb, ' ');
 736                         strbuf_addstr(sb, sha1_to_hex(p->item->object.sha1));
 737                 }
 738                 return 1;
 739         case 'p':               /* abbreviated parent hashes */
 740                 if (add_again(sb, &c->abbrev_parent_hashes))
 741                         return 1;
 742                 for (p = commit->parents; p; p = p->next) {
 743                         if (p != commit->parents)
 744                                 strbuf_addch(sb, ' ');
 745                         strbuf_addstr(sb, find_unique_abbrev(
 746                                         p->item->object.sha1, DEFAULT_ABBREV));
 747                 }
 748                 c->abbrev_parent_hashes.len = sb->len -
 749                                               c->abbrev_parent_hashes.off;
 750                 return 1;
 751         case 'm':               /* left/right/bottom */
 752                 strbuf_addch(sb, (commit->object.flags & BOUNDARY)
 753                                  ? '-'
 754                                  : (commit->object.flags & SYMMETRIC_LEFT)
 755                                  ? '<'
 756                                  : '>');
 757                 return 1;
 758         case 'd':
 759                 format_decoration(sb, commit);
 760                 return 1;
 761         case 'g':               /* reflog info */
 762                 switch(placeholder[1]) {
 763                 case 'd':       /* reflog selector */
 764                 case 'D':
 765                         if (c->pretty_ctx->reflog_info)
 766                                 get_reflog_selector(sb,
 767                                                     c->pretty_ctx->reflog_info,
 768                                                     c->pretty_ctx->date_mode,
 769                                                     (placeholder[1] == 'd'));
 770                         return 2;
 771                 case 's':       /* reflog message */
 772                         if (c->pretty_ctx->reflog_info)
 773                                 get_reflog_message(sb, c->pretty_ctx->reflog_info);
 774                         return 2;
 775                 }
 776                 return 0;       /* unknown %g placeholder */
 777         case 'N':
 778                 get_commit_notes(commit, sb, git_log_output_encoding ?
 779                              git_log_output_encoding : git_commit_encoding, 0);
 780                 return 1;
 781         }
 782
 783         /* For the rest we have to parse the commit header. */
 784         if (!c->commit_header_parsed)
 785                 parse_commit_header(c);
 786
 787         switch (placeholder[0]) {
 788         case 'a':       /* author ... */
 789                 return format_person_part(sb, placeholder[1],
 790                                    msg + c->author.off, c->author.len,
 791                                    c->pretty_ctx->date_mode);
 792         case 'c':       /* committer ... */
 793                 return format_person_part(sb, placeholder[1],
 794                                    msg + c->committer.off, c->committer.len,
 795                                    c->pretty_ctx->date_mode);
 796         case 'e':       /* encoding */
 797                 strbuf_add(sb, msg + c->encoding.off, c->encoding.len);
 798                 return 1;
 799         }
 800
 801         /* Now we need to parse the commit message. */
 802         if (!c->commit_message_parsed)
 803                 parse_commit_message(c);
 804
 805         switch (placeholder[0]) {
 806         case 's':       /* subject */
 807                 format_subject(sb, msg + c->subject_off, " ");
 808                 return 1;
 809         case 'f':       /* sanitized subject */
 810                 format_sanitized_subject(sb, msg + c->subject_off);
 811                 return 1;
 812         case 'b':       /* body */
 813                 strbuf_addstr(sb, msg + c->body_off);
 814                 return 1;
 815         }
 816         return 0;       /* unknown placeholder */
 817 }
 818
 819 static size_t format_commit_item(struct strbuf *sb, const char *placeholder,
 820                                  void *context)
 821 {
 822         int consumed;
 823         size_t orig_len;
 824         enum {
 825                 NO_MAGIC,
 826                 ADD_LF_BEFORE_NON_EMPTY,
 827                 DEL_LF_BEFORE_EMPTY,
 828         } magic = NO_MAGIC;
 829
 830         switch (placeholder[0]) {
 831         case '-':
 832                 magic = DEL_LF_BEFORE_EMPTY;
 833                 break;
 834         case '+':
 835                 magic = ADD_LF_BEFORE_NON_EMPTY;
 836                 break;
 837         default:
 838                 break;
 839         }
 840         if (magic != NO_MAGIC)
 841                 placeholder++;
 842
 843         orig_len = sb->len;
 844         consumed = format_commit_one(sb, placeholder, context);
 845         if (magic == NO_MAGIC)
 846                 return consumed;
 847
 848         if ((orig_len == sb->len) && magic == DEL_LF_BEFORE_EMPTY) {
 849                 while (sb->len && sb->buf[sb->len - 1] == '\n')
 850                         strbuf_setlen(sb, sb->len - 1);
 851         } else if ((orig_len != sb->len) && magic == ADD_LF_BEFORE_NON_EMPTY) {
 852                 strbuf_insert(sb, orig_len, "\n", 1);
 853         }
 854         return consumed + 1;
 855 }
 856
 857 void format_commit_message(const struct commit *commit,
 858                            const char *format, struct strbuf *sb,
 859                            const struct pretty_print_context *pretty_ctx)
 860 {
 861         struct format_commit_context context;
 862
 863         memset(&context, 0, sizeof(context));
 864         context.commit = commit;
 865         context.pretty_ctx = pretty_ctx;
 866         context.wrap_start = sb->len;
 867         strbuf_expand(sb, format, format_commit_item, &context);
 868         rewrap_message_tail(sb, &context, 0, 0, 0);
 869 }
 870
 871 static void pp_header(enum cmit_fmt fmt,
 872                       int abbrev,
 873                       enum date_mode dmode,
 874                       const char *encoding,
 875                       const struct commit *commit,
 876                       const char **msg_p,
 877                       struct strbuf *sb)
 878 {
 879         int parents_shown = 0;
 880
 881         for (;;) {
 882                 const char *line = *msg_p;
 883                 int linelen = get_one_line(*msg_p);
 884
 885                 if (!linelen)
 886                         return;
 887                 *msg_p += linelen;
 888
 889                 if (linelen == 1)
 890                         /* End of header */
 891                         return;
 892
 893                 if (fmt == CMIT_FMT_RAW) {
 894                         strbuf_add(sb, line, linelen);
 895                         continue;
 896                 }
 897
 898                 if (!memcmp(line, "parent ", 7)) {
 899                         if (linelen != 48)
 900                                 die("bad parent line in commit");
 901                         continue;
 902                 }
 903
 904                 if (!parents_shown) {
 905                         struct commit_list *parent;
 906                         int num;
 907                         for (parent = commit->parents, num = 0;
 908                              parent;
 909                              parent = parent->next, num++)
 910                                 ;
 911                         /* with enough slop */
 912                         strbuf_grow(sb, num * 50 + 20);
 913                         add_merge_info(fmt, sb, commit, abbrev);
 914                         parents_shown = 1;
 915                 }
 916
 917                 /*
 918                  * MEDIUM == DEFAULT shows only author with dates.
 919                  * FULL shows both authors but not dates.
 920                  * FULLER shows both authors and dates.
 921                  */
 922                 if (!memcmp(line, "author ", 7)) {
 923                         strbuf_grow(sb, linelen + 80);
 924                         pp_user_info("Author", fmt, sb, line + 7, dmode, encoding);
 925                 }
 926                 if (!memcmp(line, "committer ", 10) &&
 927                     (fmt == CMIT_FMT_FULL || fmt == CMIT_FMT_FULLER)) {
 928                         strbuf_grow(sb, linelen + 80);
 929                         pp_user_info("Commit", fmt, sb, line + 10, dmode, encoding);
 930                 }
 931         }
 932 }
 933
 934 void pp_title_line(enum cmit_fmt fmt,
 935                    const char **msg_p,
 936                    struct strbuf *sb,
 937                    const char *subject,
 938                    const char *after_subject,
 939                    const char *encoding,
 940                    int need_8bit_cte)
 941 {
 942         const char *line_separator = (fmt == CMIT_FMT_EMAIL) ? "\n " : " ";
 943         struct strbuf title;
 944
 945         strbuf_init(&title, 80);
 946         *msg_p = format_subject(&title, *msg_p, line_separator);
 947
 948         strbuf_grow(sb, title.len + 1024);
 949         if (subject) {
 950                 strbuf_addstr(sb, subject);
 951                 add_rfc2047(sb, title.buf, title.len, encoding);
 952         } else {
 953                 strbuf_addbuf(sb, &title);
 954         }
 955         strbuf_addch(sb, '\n');
 956
 957         if (need_8bit_cte > 0) {
 958                 const char *header_fmt =
 959                         "MIME-Version: 1.0\n"
 960                         "Content-Type: text/plain; charset=%s\n"
 961                         "Content-Transfer-Encoding: 8bit\n";
 962                 strbuf_addf(sb, header_fmt, encoding);
 963         }
 964         if (after_subject) {
 965                 strbuf_addstr(sb, after_subject);
 966         }
 967         if (fmt == CMIT_FMT_EMAIL) {
 968                 strbuf_addch(sb, '\n');
 969         }
 970         strbuf_release(&title);
 971 }
 972
 973 void pp_remainder(enum cmit_fmt fmt,
 974                   const char **msg_p,
 975                   struct strbuf *sb,
 976                   int indent)
 977 {
 978         int first = 1;
 979         for (;;) {
 980                 const char *line = *msg_p;
 981                 int linelen = get_one_line(line);
 982                 *msg_p += linelen;
 983
 984                 if (!linelen)
 985                         break;
 986
 987                 if (is_empty_line(line, &linelen)) {
 988                         if (first)
 989                                 continue;
 990                         if (fmt == CMIT_FMT_SHORT)
 991                                 break;
 992                 }
 993                 first = 0;
 994
 995                 strbuf_grow(sb, linelen + indent + 20);
 996                 if (indent) {
 997                         memset(sb->buf + sb->len, ' ', indent);
 998                         strbuf_setlen(sb, sb->len + indent);
 999                 }
1000                 strbuf_add(sb, line, linelen);
1001                 strbuf_addch(sb, '\n');
1002         }
1003 }
1004
1005 char *reencode_commit_message(const struct commit *commit, const char **encoding_p)
1006 {
1007         const char *encoding;
1008
1009         encoding = (git_log_output_encoding
1010                     ? git_log_output_encoding
1011                     : git_commit_encoding);
1012         if (!encoding)
1013                 encoding = "UTF-8";
1014         if (encoding_p)
1015                 *encoding_p = encoding;
1016         return logmsg_reencode(commit, encoding);
1017 }
1018
1019 void pretty_print_commit(enum cmit_fmt fmt, const struct commit *commit,
1020                          struct strbuf *sb,
1021                          const struct pretty_print_context *context)
1022 {
1023         unsigned long beginning_of_body;
1024         int indent = 4;
1025         const char *msg = commit->buffer;
1026         char *reencoded;
1027         const char *encoding;
1028         int need_8bit_cte = context->need_8bit_cte;
1029
1030         if (fmt == CMIT_FMT_USERFORMAT) {
1031                 format_commit_message(commit, user_format, sb, context);
1032                 return;
1033         }
1034
1035         reencoded = reencode_commit_message(commit, &encoding);
1036         if (reencoded) {
1037                 msg = reencoded;
1038         }
1039
1040         if (fmt == CMIT_FMT_ONELINE || fmt == CMIT_FMT_EMAIL)
1041                 indent = 0;
1042
1043         /*
1044          * We need to check and emit Content-type: to mark it
1045          * as 8-bit if we haven't done so.
1046          */
1047         if (fmt == CMIT_FMT_EMAIL && need_8bit_cte == 0) {
1048                 int i, ch, in_body;
1049
1050                 for (in_body = i = 0; (ch = msg[i]); i++) {
1051                         if (!in_body) {
1052                                 /* author could be non 7-bit ASCII but
1053                                  * the log may be so; skip over the
1054                                  * header part first.
1055                                  */
1056                                 if (ch == '\n' && msg[i+1] == '\n')
1057                                         in_body = 1;
1058                         }
1059                         else if (non_ascii(ch)) {
1060                                 need_8bit_cte = 1;
1061                                 break;
1062                         }
1063                 }
1064         }
1065
1066         pp_header(fmt, context->abbrev, context->date_mode, encoding,
1067                   commit, &msg, sb);
1068         if (fmt != CMIT_FMT_ONELINE && !context->subject) {
1069                 strbuf_addch(sb, '\n');
1070         }
1071
1072         /* Skip excess blank lines at the beginning of body, if any... */
1073         msg = skip_empty_lines(msg);
1074
1075         /* These formats treat the title line specially. */
1076         if (fmt == CMIT_FMT_ONELINE || fmt == CMIT_FMT_EMAIL)
1077                 pp_title_line(fmt, &msg, sb, context->subject,
1078                               context->after_subject, encoding, need_8bit_cte);
1079
1080         beginning_of_body = sb->len;
1081         if (fmt != CMIT_FMT_ONELINE)
1082                 pp_remainder(fmt, &msg, sb, indent);
1083         strbuf_rtrim(sb);
1084
1085         /* Make sure there is an EOLN for the non-oneline case */
1086         if (fmt != CMIT_FMT_ONELINE)
1087                 strbuf_addch(sb, '\n');
1088
1089         /*
1090          * The caller may append additional body text in e-mail
1091          * format.  Make sure we did not strip the blank line
1092          * between the header and the body.
1093          */
1094         if (fmt == CMIT_FMT_EMAIL && sb->len <= beginning_of_body)
1095                 strbuf_addch(sb, '\n');
1096
1097         if (fmt != CMIT_FMT_ONELINE)
1098                 get_commit_notes(commit, sb, encoding,
1099                                  NOTES_SHOW_HEADER | NOTES_INDENT);
1100
1101         free(reencoded);
1102 }