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 "color.h"
  10
  11 static char *user_format;
  12
  13 void get_commit_format(const char *arg, struct rev_info *rev)
  14 {
  15         int i;
  16         static struct cmt_fmt_map {
  17                 const char *n;
  18                 size_t cmp_len;
  19                 enum cmit_fmt v;
  20         } cmt_fmts[] = {
  21                 { "raw",        1,      CMIT_FMT_RAW },
  22                 { "medium",     1,      CMIT_FMT_MEDIUM },
  23                 { "short",      1,      CMIT_FMT_SHORT },
  24                 { "email",      1,      CMIT_FMT_EMAIL },
  25                 { "full",       5,      CMIT_FMT_FULL },
  26                 { "fuller",     5,      CMIT_FMT_FULLER },
  27                 { "oneline",    1,      CMIT_FMT_ONELINE },
  28         };
  29
  30         rev->use_terminator = 0;
  31         if (!arg || !*arg) {
  32                 rev->commit_format = CMIT_FMT_DEFAULT;
  33                 return;
  34         }
  35         if (!prefixcmp(arg, "format:") || !prefixcmp(arg, "tformat:")) {
  36                 const char *cp = strchr(arg, ':') + 1;
  37                 free(user_format);
  38                 user_format = xstrdup(cp);
  39                 if (arg[0] == 't')
  40                         rev->use_terminator = 1;
  41                 rev->commit_format = CMIT_FMT_USERFORMAT;
  42                 return;
  43         }
  44         for (i = 0; i < ARRAY_SIZE(cmt_fmts); i++) {
  45                 if (!strncmp(arg, cmt_fmts[i].n, cmt_fmts[i].cmp_len) &&
  46                     !strncmp(arg, cmt_fmts[i].n, strlen(arg))) {
  47                         if (cmt_fmts[i].v == CMIT_FMT_ONELINE)
  48                                 rev->use_terminator = 1;
  49                         rev->commit_format = cmt_fmts[i].v;
  50                         return;
  51                 }
  52         }
  53
  54         die("invalid --pretty format: %s", arg);
  55 }
  56
  57 /*
  58  * Generic support for pretty-printing the header
  59  */
  60 static int get_one_line(const char *msg)
  61 {
  62         int ret = 0;
  63
  64         for (;;) {
  65                 char c = *msg++;
  66                 if (!c)
  67                         break;
  68                 ret++;
  69                 if (c == '\n')
  70                         break;
  71         }
  72         return ret;
  73 }
  74
  75 /* High bit set, or ISO-2022-INT */
  76 int non_ascii(int ch)
  77 {
  78         ch = (ch & 0xff);
  79         return ((ch & 0x80) || (ch == 0x1b));
  80 }
  81
  82 static int is_rfc2047_special(char ch)
  83 {
  84         return (non_ascii(ch) || (ch == '=') || (ch == '?') || (ch == '_'));
  85 }
  86
  87 static void add_rfc2047(struct strbuf *sb, const char *line, int len,
  88                        const char *encoding)
  89 {
  90         int i, last;
  91
  92         for (i = 0; i < len; i++) {
  93                 int ch = line[i];
  94                 if (non_ascii(ch))
  95                         goto needquote;
  96                 if ((i + 1 < len) && (ch == '=' && line[i+1] == '?'))
  97                         goto needquote;
  98         }
  99         strbuf_add(sb, line, len);
 100         return;
 101
 102 needquote:
 103         strbuf_grow(sb, len * 3 + strlen(encoding) + 100);
 104         strbuf_addf(sb, "=?%s?q?", encoding);
 105         for (i = last = 0; i < len; i++) {
 106                 unsigned ch = line[i] & 0xFF;
 107                 /*
 108                  * We encode ' ' using '=20' even though rfc2047
 109                  * allows using '_' for readability.  Unfortunately,
 110                  * many programs do not understand this and just
 111                  * leave the underscore in place.
 112                  */
 113                 if (is_rfc2047_special(ch) || ch == ' ') {
 114                         strbuf_add(sb, line + last, i - last);
 115                         strbuf_addf(sb, "=%02X", ch);
 116                         last = i + 1;
 117                 }
 118         }
 119         strbuf_add(sb, line + last, len - last);
 120         strbuf_addstr(sb, "?=");
 121 }
 122
 123 void pp_user_info(const char *what, enum cmit_fmt fmt, struct strbuf *sb,
 124                   const char *line, enum date_mode dmode,
 125                   const char *encoding)
 126 {
 127         char *date;
 128         int namelen;
 129         unsigned long time;
 130         int tz;
 131         const char *filler = "    ";
 132
 133         if (fmt == CMIT_FMT_ONELINE)
 134                 return;
 135         date = strchr(line, '>');
 136         if (!date)
 137                 return;
 138         namelen = ++date - line;
 139         time = strtoul(date, &date, 10);
 140         tz = strtol(date, NULL, 10);
 141
 142         if (fmt == CMIT_FMT_EMAIL) {
 143                 char *name_tail = strchr(line, '<');
 144                 int display_name_length;
 145                 if (!name_tail)
 146                         return;
 147                 while (line < name_tail && isspace(name_tail[-1]))
 148                         name_tail--;
 149                 display_name_length = name_tail - line;
 150                 filler = "";
 151                 strbuf_addstr(sb, "From: ");
 152                 add_rfc2047(sb, line, display_name_length, encoding);
 153                 strbuf_add(sb, name_tail, namelen - display_name_length);
 154                 strbuf_addch(sb, '\n');
 155         } else {
 156                 strbuf_addf(sb, "%s: %.*s%.*s\n", what,
 157                               (fmt == CMIT_FMT_FULLER) ? 4 : 0,
 158                               filler, namelen, line);
 159         }
 160         switch (fmt) {
 161         case CMIT_FMT_MEDIUM:
 162                 strbuf_addf(sb, "Date:   %s\n", show_date(time, tz, dmode));
 163                 break;
 164         case CMIT_FMT_EMAIL:
 165                 strbuf_addf(sb, "Date: %s\n", show_date(time, tz, DATE_RFC2822));
 166                 break;
 167         case CMIT_FMT_FULLER:
 168                 strbuf_addf(sb, "%sDate: %s\n", what, show_date(time, tz, dmode));
 169                 break;
 170         default:
 171                 /* notin' */
 172                 break;
 173         }
 174 }
 175
 176 static int is_empty_line(const char *line, int *len_p)
 177 {
 178         int len = *len_p;
 179         while (len && isspace(line[len-1]))
 180                 len--;
 181         *len_p = len;
 182         return !len;
 183 }
 184
 185 static const char *skip_empty_lines(const char *msg)
 186 {
 187         for (;;) {
 188                 int linelen = get_one_line(msg);
 189                 int ll = linelen;
 190                 if (!linelen)
 191                         break;
 192                 if (!is_empty_line(msg, &ll))
 193                         break;
 194                 msg += linelen;
 195         }
 196         return msg;
 197 }
 198
 199 static void add_merge_info(enum cmit_fmt fmt, struct strbuf *sb,
 200                         const struct commit *commit, int abbrev)
 201 {
 202         struct commit_list *parent = commit->parents;
 203
 204         if ((fmt == CMIT_FMT_ONELINE) || (fmt == CMIT_FMT_EMAIL) ||
 205             !parent || !parent->next)
 206                 return;
 207
 208         strbuf_addstr(sb, "Merge:");
 209
 210         while (parent) {
 211                 struct commit *p = parent->item;
 212                 const char *hex = NULL;
 213                 const char *dots;
 214                 if (abbrev)
 215                         hex = find_unique_abbrev(p->object.sha1, abbrev);
 216                 if (!hex)
 217                         hex = sha1_to_hex(p->object.sha1);
 218                 dots = (abbrev && strlen(hex) != 40) ?  "..." : "";
 219                 parent = parent->next;
 220
 221                 strbuf_addf(sb, " %s%s", hex, dots);
 222         }
 223         strbuf_addch(sb, '\n');
 224 }
 225
 226 static char *get_header(const struct commit *commit, const char *key)
 227 {
 228         int key_len = strlen(key);
 229         const char *line = commit->buffer;
 230
 231         for (;;) {
 232                 const char *eol = strchr(line, '\n'), *next;
 233
 234                 if (line == eol)
 235                         return NULL;
 236                 if (!eol) {
 237                         eol = line + strlen(line);
 238                         next = NULL;
 239                 } else
 240                         next = eol + 1;
 241                 if (eol - line > key_len &&
 242                     !strncmp(line, key, key_len) &&
 243                     line[key_len] == ' ') {
 244                         return xmemdupz(line + key_len + 1, eol - line - key_len - 1);
 245                 }
 246                 line = next;
 247         }
 248 }
 249
 250 static char *replace_encoding_header(char *buf, const char *encoding)
 251 {
 252         struct strbuf tmp = STRBUF_INIT;
 253         size_t start, len;
 254         char *cp = buf;
 255
 256         /* guess if there is an encoding header before a \n\n */
 257         while (strncmp(cp, "encoding ", strlen("encoding "))) {
 258                 cp = strchr(cp, '\n');
 259                 if (!cp || *++cp == '\n')
 260                         return buf;
 261         }
 262         start = cp - buf;
 263         cp = strchr(cp, '\n');
 264         if (!cp)
 265                 return buf; /* should not happen but be defensive */
 266         len = cp + 1 - (buf + start);
 267
 268         strbuf_attach(&tmp, buf, strlen(buf), strlen(buf) + 1);
 269         if (is_encoding_utf8(encoding)) {
 270                 /* we have re-coded to UTF-8; drop the header */
 271                 strbuf_remove(&tmp, start, len);
 272         } else {
 273                 /* just replaces XXXX in 'encoding XXXX\n' */
 274                 strbuf_splice(&tmp, start + strlen("encoding "),
 275                                           len - strlen("encoding \n"),
 276                                           encoding, strlen(encoding));
 277         }
 278         return strbuf_detach(&tmp, NULL);
 279 }
 280
 281 static char *logmsg_reencode(const struct commit *commit,
 282                              const char *output_encoding)
 283 {
 284         static const char *utf8 = "utf-8";
 285         const char *use_encoding;
 286         char *encoding;
 287         char *out;
 288
 289         if (!*output_encoding)
 290                 return NULL;
 291         encoding = get_header(commit, "encoding");
 292         use_encoding = encoding ? encoding : utf8;
 293         if (!strcmp(use_encoding, output_encoding))
 294                 if (encoding) /* we'll strip encoding header later */
 295                         out = xstrdup(commit->buffer);
 296                 else
 297                         return NULL; /* nothing to do */
 298         else
 299                 out = reencode_string(commit->buffer,
 300                                       output_encoding, use_encoding);
 301         if (out)
 302                 out = replace_encoding_header(out, output_encoding);
 303
 304         free(encoding);
 305         return out;
 306 }
 307
 308 static int mailmap_name(char *email, int email_len, char *name, int name_len)
 309 {
 310         static struct string_list *mail_map;
 311         if (!mail_map) {
 312                 mail_map = xcalloc(1, sizeof(*mail_map));
 313                 read_mailmap(mail_map, NULL);
 314         }
 315         return mail_map->nr && map_user(mail_map, email, email_len, name, name_len);
 316 }
 317
 318 static size_t format_person_part(struct strbuf *sb, char part,
 319                                  const char *msg, int len, enum date_mode dmode)
 320 {
 321         /* currently all placeholders have same length */
 322         const int placeholder_len = 2;
 323         int start, end, tz = 0;
 324         unsigned long date = 0;
 325         char *ep;
 326         const char *name_start, *name_end, *mail_start, *mail_end, *msg_end = msg+len;
 327         char person_name[1024];
 328         char person_mail[1024];
 329
 330         /* advance 'end' to point to email start delimiter */
 331         for (end = 0; end < len && msg[end] != '<'; end++)
 332                 ; /* do nothing */
 333
 334         /*
 335          * When end points at the '<' that we found, it should have
 336          * matching '>' later, which means 'end' must be strictly
 337          * below len - 1.
 338          */
 339         if (end >= len - 2)
 340                 goto skip;
 341
 342         /* Seek for both name and email part */
 343         name_start = msg;
 344         name_end = msg+end;
 345         while (name_end > name_start && isspace(*(name_end-1)))
 346                 name_end--;
 347         mail_start = msg+end+1;
 348         mail_end = mail_start;
 349         while (mail_end < msg_end && *mail_end != '>')
 350                 mail_end++;
 351         if (mail_end == msg_end)
 352                 goto skip;
 353         end = mail_end-msg;
 354
 355         if (part == 'N' || part == 'E') { /* mailmap lookup */
 356                 strlcpy(person_name, name_start, name_end-name_start+1);
 357                 strlcpy(person_mail, mail_start, mail_end-mail_start+1);
 358                 mailmap_name(person_mail, sizeof(person_mail), person_name, sizeof(person_name));
 359                 name_start = person_name;
 360                 name_end = name_start + strlen(person_name);
 361                 mail_start = person_mail;
 362                 mail_end = mail_start +  strlen(person_mail);
 363         }
 364         if (part == 'n' || part == 'N') {       /* name */
 365                 strbuf_add(sb, name_start, name_end-name_start);
 366                 return placeholder_len;
 367         }
 368         if (part == 'e' || part == 'E') {       /* email */
 369                 strbuf_add(sb, mail_start, mail_end-mail_start);
 370                 return placeholder_len;
 371         }
 372
 373         /* advance 'start' to point to date start delimiter */
 374         for (start = end + 1; start < len && isspace(msg[start]); start++)
 375                 ; /* do nothing */
 376         if (start >= len)
 377                 goto skip;
 378         date = strtoul(msg + start, &ep, 10);
 379         if (msg + start == ep)
 380                 goto skip;
 381
 382         if (part == 't') {      /* date, UNIX timestamp */
 383                 strbuf_add(sb, msg + start, ep - (msg + start));
 384                 return placeholder_len;
 385         }
 386
 387         /* parse tz */
 388         for (start = ep - msg + 1; start < len && isspace(msg[start]); start++)
 389                 ; /* do nothing */
 390         if (start + 1 < len) {
 391                 tz = strtoul(msg + start + 1, NULL, 10);
 392                 if (msg[start] == '-')
 393                         tz = -tz;
 394         }
 395
 396         switch (part) {
 397         case 'd':       /* date */
 398                 strbuf_addstr(sb, show_date(date, tz, dmode));
 399                 return placeholder_len;
 400         case 'D':       /* date, RFC2822 style */
 401                 strbuf_addstr(sb, show_date(date, tz, DATE_RFC2822));
 402                 return placeholder_len;
 403         case 'r':       /* date, relative */
 404                 strbuf_addstr(sb, show_date(date, tz, DATE_RELATIVE));
 405                 return placeholder_len;
 406         case 'i':       /* date, ISO 8601 */
 407                 strbuf_addstr(sb, show_date(date, tz, DATE_ISO8601));
 408                 return placeholder_len;
 409         }
 410
 411 skip:
 412         /*
 413          * bogus commit, 'sb' cannot be updated, but we still need to
 414          * compute a valid return value.
 415          */
 416         if (part == 'n' || part == 'e' || part == 't' || part == 'd'
 417             || part == 'D' || part == 'r' || part == 'i')
 418                 return placeholder_len;
 419
 420         return 0; /* unknown placeholder */
 421 }
 422
 423 struct chunk {
 424         size_t off;
 425         size_t len;
 426 };
 427
 428 struct format_commit_context {
 429         const struct commit *commit;
 430         enum date_mode dmode;
 431         unsigned commit_header_parsed:1;
 432         unsigned commit_message_parsed:1;
 433
 434         /* These offsets are relative to the start of the commit message. */
 435         struct chunk author;
 436         struct chunk committer;
 437         struct chunk encoding;
 438         size_t message_off;
 439         size_t subject_off;
 440         size_t body_off;
 441
 442         /* The following ones are relative to the result struct strbuf. */
 443         struct chunk abbrev_commit_hash;
 444         struct chunk abbrev_tree_hash;
 445         struct chunk abbrev_parent_hashes;
 446 };
 447
 448 static int add_again(struct strbuf *sb, struct chunk *chunk)
 449 {
 450         if (chunk->len) {
 451                 strbuf_adddup(sb, chunk->off, chunk->len);
 452                 return 1;
 453         }
 454
 455         /*
 456          * We haven't seen this chunk before.  Our caller is surely
 457          * going to add it the hard way now.  Remember the most likely
 458          * start of the to-be-added chunk: the current end of the
 459          * struct strbuf.
 460          */
 461         chunk->off = sb->len;
 462         return 0;
 463 }
 464
 465 static void parse_commit_header(struct format_commit_context *context)
 466 {
 467         const char *msg = context->commit->buffer;
 468         int i;
 469
 470         for (i = 0; msg[i]; i++) {
 471                 int eol;
 472                 for (eol = i; msg[eol] && msg[eol] != '\n'; eol++)
 473                         ; /* do nothing */
 474
 475                 if (i == eol) {
 476                         break;
 477                 } else if (!prefixcmp(msg + i, "author ")) {
 478                         context->author.off = i + 7;
 479                         context->author.len = eol - i - 7;
 480                 } else if (!prefixcmp(msg + i, "committer ")) {
 481                         context->committer.off = i + 10;
 482                         context->committer.len = eol - i - 10;
 483                 } else if (!prefixcmp(msg + i, "encoding ")) {
 484                         context->encoding.off = i + 9;
 485                         context->encoding.len = eol - i - 9;
 486                 }
 487                 i = eol;
 488         }
 489         context->message_off = i;
 490         context->commit_header_parsed = 1;
 491 }
 492
 493 const char *format_subject(struct strbuf *sb, const char *msg,
 494                            const char *line_separator)
 495 {
 496         int first = 1;
 497
 498         for (;;) {
 499                 const char *line = msg;
 500                 int linelen = get_one_line(line);
 501
 502                 msg += linelen;
 503                 if (!linelen || is_empty_line(line, &linelen))
 504                         break;
 505
 506                 if (!sb)
 507                         continue;
 508                 strbuf_grow(sb, linelen + 2);
 509                 if (!first)
 510                         strbuf_addstr(sb, line_separator);
 511                 strbuf_add(sb, line, linelen);
 512                 first = 0;
 513         }
 514         return msg;
 515 }
 516
 517 static void parse_commit_message(struct format_commit_context *c)
 518 {
 519         const char *msg = c->commit->buffer + c->message_off;
 520         const char *start = c->commit->buffer;
 521
 522         msg = skip_empty_lines(msg);
 523         c->subject_off = msg - start;
 524
 525         msg = format_subject(NULL, msg, NULL);
 526         msg = skip_empty_lines(msg);
 527         c->body_off = msg - start;
 528
 529         c->commit_message_parsed = 1;
 530 }
 531
 532 static void format_decoration(struct strbuf *sb, const struct commit *commit)
 533 {
 534         struct name_decoration *d;
 535         const char *prefix = " (";
 536
 537         load_ref_decorations();
 538         d = lookup_decoration(&name_decoration, &commit->object);
 539         while (d) {
 540                 strbuf_addstr(sb, prefix);
 541                 prefix = ", ";
 542                 strbuf_addstr(sb, d->name);
 543                 d = d->next;
 544         }
 545         if (prefix[0] == ',')
 546                 strbuf_addch(sb, ')');
 547 }
 548
 549 static size_t format_commit_item(struct strbuf *sb, const char *placeholder,
 550                                void *context)
 551 {
 552         struct format_commit_context *c = context;
 553         const struct commit *commit = c->commit;
 554         const char *msg = commit->buffer;
 555         struct commit_list *p;
 556         int h1, h2;
 557
 558         /* these are independent of the commit */
 559         switch (placeholder[0]) {
 560         case 'C':
 561                 if (placeholder[1] == '(') {
 562                         const char *end = strchr(placeholder + 2, ')');
 563                         char color[COLOR_MAXLEN];
 564                         if (!end)
 565                                 return 0;
 566                         color_parse_mem(placeholder + 2,
 567                                         end - (placeholder + 2),
 568                                         "--pretty format", color);
 569                         strbuf_addstr(sb, color);
 570                         return end - placeholder + 1;
 571                 }
 572                 if (!prefixcmp(placeholder + 1, "red")) {
 573                         strbuf_addstr(sb, "\033[31m");
 574                         return 4;
 575                 } else if (!prefixcmp(placeholder + 1, "green")) {
 576                         strbuf_addstr(sb, "\033[32m");
 577                         return 6;
 578                 } else if (!prefixcmp(placeholder + 1, "blue")) {
 579                         strbuf_addstr(sb, "\033[34m");
 580                         return 5;
 581                 } else if (!prefixcmp(placeholder + 1, "reset")) {
 582                         strbuf_addstr(sb, "\033[m");
 583                         return 6;
 584                 } else
 585                         return 0;
 586         case 'n':               /* newline */
 587                 strbuf_addch(sb, '\n');
 588                 return 1;
 589         case 'x':
 590                 /* %x00 == NUL, %x0a == LF, etc. */
 591                 if (0 <= (h1 = hexval_table[0xff & placeholder[1]]) &&
 592                     h1 <= 16 &&
 593                     0 <= (h2 = hexval_table[0xff & placeholder[2]]) &&
 594                     h2 <= 16) {
 595                         strbuf_addch(sb, (h1<<4)|h2);
 596                         return 3;
 597                 } else
 598                         return 0;
 599         }
 600
 601         /* these depend on the commit */
 602         if (!commit->object.parsed)
 603                 parse_object(commit->object.sha1);
 604
 605         switch (placeholder[0]) {
 606         case 'H':               /* commit hash */
 607                 strbuf_addstr(sb, sha1_to_hex(commit->object.sha1));
 608                 return 1;
 609         case 'h':               /* abbreviated commit hash */
 610                 if (add_again(sb, &c->abbrev_commit_hash))
 611                         return 1;
 612                 strbuf_addstr(sb, find_unique_abbrev(commit->object.sha1,
 613                                                      DEFAULT_ABBREV));
 614                 c->abbrev_commit_hash.len = sb->len - c->abbrev_commit_hash.off;
 615                 return 1;
 616         case 'T':               /* tree hash */
 617                 strbuf_addstr(sb, sha1_to_hex(commit->tree->object.sha1));
 618                 return 1;
 619         case 't':               /* abbreviated tree hash */
 620                 if (add_again(sb, &c->abbrev_tree_hash))
 621                         return 1;
 622                 strbuf_addstr(sb, find_unique_abbrev(commit->tree->object.sha1,
 623                                                      DEFAULT_ABBREV));
 624                 c->abbrev_tree_hash.len = sb->len - c->abbrev_tree_hash.off;
 625                 return 1;
 626         case 'P':               /* parent hashes */
 627                 for (p = commit->parents; p; p = p->next) {
 628                         if (p != commit->parents)
 629                                 strbuf_addch(sb, ' ');
 630                         strbuf_addstr(sb, sha1_to_hex(p->item->object.sha1));
 631                 }
 632                 return 1;
 633         case 'p':               /* abbreviated parent hashes */
 634                 if (add_again(sb, &c->abbrev_parent_hashes))
 635                         return 1;
 636                 for (p = commit->parents; p; p = p->next) {
 637                         if (p != commit->parents)
 638                                 strbuf_addch(sb, ' ');
 639                         strbuf_addstr(sb, find_unique_abbrev(
 640                                         p->item->object.sha1, DEFAULT_ABBREV));
 641                 }
 642                 c->abbrev_parent_hashes.len = sb->len -
 643                                               c->abbrev_parent_hashes.off;
 644                 return 1;
 645         case 'm':               /* left/right/bottom */
 646                 strbuf_addch(sb, (commit->object.flags & BOUNDARY)
 647                                  ? '-'
 648                                  : (commit->object.flags & SYMMETRIC_LEFT)
 649                                  ? '<'
 650                                  : '>');
 651                 return 1;
 652         case 'd':
 653                 format_decoration(sb, commit);
 654                 return 1;
 655         }
 656
 657         /* For the rest we have to parse the commit header. */
 658         if (!c->commit_header_parsed)
 659                 parse_commit_header(c);
 660
 661         switch (placeholder[0]) {
 662         case 'a':       /* author ... */
 663                 return format_person_part(sb, placeholder[1],
 664                                    msg + c->author.off, c->author.len,
 665                                    c->dmode);
 666         case 'c':       /* committer ... */
 667                 return format_person_part(sb, placeholder[1],
 668                                    msg + c->committer.off, c->committer.len,
 669                                    c->dmode);
 670         case 'e':       /* encoding */
 671                 strbuf_add(sb, msg + c->encoding.off, c->encoding.len);
 672                 return 1;
 673         }
 674
 675         /* Now we need to parse the commit message. */
 676         if (!c->commit_message_parsed)
 677                 parse_commit_message(c);
 678
 679         switch (placeholder[0]) {
 680         case 's':       /* subject */
 681                 format_subject(sb, msg + c->subject_off, " ");
 682                 return 1;
 683         case 'b':       /* body */
 684                 strbuf_addstr(sb, msg + c->body_off);
 685                 return 1;
 686         }
 687         return 0;       /* unknown placeholder */
 688 }
 689
 690 void format_commit_message(const struct commit *commit,
 691                            const void *format, struct strbuf *sb,
 692                            enum date_mode dmode)
 693 {
 694         struct format_commit_context context;
 695
 696         memset(&context, 0, sizeof(context));
 697         context.commit = commit;
 698         context.dmode = dmode;
 699         strbuf_expand(sb, format, format_commit_item, &context);
 700 }
 701
 702 static void pp_header(enum cmit_fmt fmt,
 703                       int abbrev,
 704                       enum date_mode dmode,
 705                       const char *encoding,
 706                       const struct commit *commit,
 707                       const char **msg_p,
 708                       struct strbuf *sb)
 709 {
 710         int parents_shown = 0;
 711
 712         for (;;) {
 713                 const char *line = *msg_p;
 714                 int linelen = get_one_line(*msg_p);
 715
 716                 if (!linelen)
 717                         return;
 718                 *msg_p += linelen;
 719
 720                 if (linelen == 1)
 721                         /* End of header */
 722                         return;
 723
 724                 if (fmt == CMIT_FMT_RAW) {
 725                         strbuf_add(sb, line, linelen);
 726                         continue;
 727                 }
 728
 729                 if (!memcmp(line, "parent ", 7)) {
 730                         if (linelen != 48)
 731                                 die("bad parent line in commit");
 732                         continue;
 733                 }
 734
 735                 if (!parents_shown) {
 736                         struct commit_list *parent;
 737                         int num;
 738                         for (parent = commit->parents, num = 0;
 739                              parent;
 740                              parent = parent->next, num++)
 741                                 ;
 742                         /* with enough slop */
 743                         strbuf_grow(sb, num * 50 + 20);
 744                         add_merge_info(fmt, sb, commit, abbrev);
 745                         parents_shown = 1;
 746                 }
 747
 748                 /*
 749                  * MEDIUM == DEFAULT shows only author with dates.
 750                  * FULL shows both authors but not dates.
 751                  * FULLER shows both authors and dates.
 752                  */
 753                 if (!memcmp(line, "author ", 7)) {
 754                         strbuf_grow(sb, linelen + 80);
 755                         pp_user_info("Author", fmt, sb, line + 7, dmode, encoding);
 756                 }
 757                 if (!memcmp(line, "committer ", 10) &&
 758                     (fmt == CMIT_FMT_FULL || fmt == CMIT_FMT_FULLER)) {
 759                         strbuf_grow(sb, linelen + 80);
 760                         pp_user_info("Commit", fmt, sb, line + 10, dmode, encoding);
 761                 }
 762         }
 763 }
 764
 765 void pp_title_line(enum cmit_fmt fmt,
 766                    const char **msg_p,
 767                    struct strbuf *sb,
 768                    const char *subject,
 769                    const char *after_subject,
 770                    const char *encoding,
 771                    int need_8bit_cte)
 772 {
 773         const char *line_separator = (fmt == CMIT_FMT_EMAIL) ? "\n " : " ";
 774         struct strbuf title;
 775
 776         strbuf_init(&title, 80);
 777         *msg_p = format_subject(&title, *msg_p, line_separator);
 778
 779         strbuf_grow(sb, title.len + 1024);
 780         if (subject) {
 781                 strbuf_addstr(sb, subject);
 782                 add_rfc2047(sb, title.buf, title.len, encoding);
 783         } else {
 784                 strbuf_addbuf(sb, &title);
 785         }
 786         strbuf_addch(sb, '\n');
 787
 788         if (need_8bit_cte > 0) {
 789                 const char *header_fmt =
 790                         "MIME-Version: 1.0\n"
 791                         "Content-Type: text/plain; charset=%s\n"
 792                         "Content-Transfer-Encoding: 8bit\n";
 793                 strbuf_addf(sb, header_fmt, encoding);
 794         }
 795         if (after_subject) {
 796                 strbuf_addstr(sb, after_subject);
 797         }
 798         if (fmt == CMIT_FMT_EMAIL) {
 799                 strbuf_addch(sb, '\n');
 800         }
 801         strbuf_release(&title);
 802 }
 803
 804 void pp_remainder(enum cmit_fmt fmt,
 805                   const char **msg_p,
 806                   struct strbuf *sb,
 807                   int indent)
 808 {
 809         int first = 1;
 810         for (;;) {
 811                 const char *line = *msg_p;
 812                 int linelen = get_one_line(line);
 813                 *msg_p += linelen;
 814
 815                 if (!linelen)
 816                         break;
 817
 818                 if (is_empty_line(line, &linelen)) {
 819                         if (first)
 820                                 continue;
 821                         if (fmt == CMIT_FMT_SHORT)
 822                                 break;
 823                 }
 824                 first = 0;
 825
 826                 strbuf_grow(sb, linelen + indent + 20);
 827                 if (indent) {
 828                         memset(sb->buf + sb->len, ' ', indent);
 829                         strbuf_setlen(sb, sb->len + indent);
 830                 }
 831                 strbuf_add(sb, line, linelen);
 832                 strbuf_addch(sb, '\n');
 833         }
 834 }
 835
 836 char *reencode_commit_message(const struct commit *commit, const char **encoding_p)
 837 {
 838         const char *encoding;
 839
 840         encoding = (git_log_output_encoding
 841                     ? git_log_output_encoding
 842                     : git_commit_encoding);
 843         if (!encoding)
 844                 encoding = "utf-8";
 845         if (encoding_p)
 846                 *encoding_p = encoding;
 847         return logmsg_reencode(commit, encoding);
 848 }
 849
 850 void pretty_print_commit(enum cmit_fmt fmt, const struct commit *commit,
 851                          struct strbuf *sb, int abbrev,
 852                          const char *subject, const char *after_subject,
 853                          enum date_mode dmode, int need_8bit_cte)
 854 {
 855         unsigned long beginning_of_body;
 856         int indent = 4;
 857         const char *msg = commit->buffer;
 858         char *reencoded;
 859         const char *encoding;
 860
 861         if (fmt == CMIT_FMT_USERFORMAT) {
 862                 format_commit_message(commit, user_format, sb, dmode);
 863                 return;
 864         }
 865
 866         reencoded = reencode_commit_message(commit, &encoding);
 867         if (reencoded) {
 868                 msg = reencoded;
 869         }
 870
 871         if (fmt == CMIT_FMT_ONELINE || fmt == CMIT_FMT_EMAIL)
 872                 indent = 0;
 873
 874         /*
 875          * We need to check and emit Content-type: to mark it
 876          * as 8-bit if we haven't done so.
 877          */
 878         if (fmt == CMIT_FMT_EMAIL && need_8bit_cte == 0) {
 879                 int i, ch, in_body;
 880
 881                 for (in_body = i = 0; (ch = msg[i]); i++) {
 882                         if (!in_body) {
 883                                 /* author could be non 7-bit ASCII but
 884                                  * the log may be so; skip over the
 885                                  * header part first.
 886                                  */
 887                                 if (ch == '\n' && msg[i+1] == '\n')
 888                                         in_body = 1;
 889                         }
 890                         else if (non_ascii(ch)) {
 891                                 need_8bit_cte = 1;
 892                                 break;
 893                         }
 894                 }
 895         }
 896
 897         pp_header(fmt, abbrev, dmode, encoding, commit, &msg, sb);
 898         if (fmt != CMIT_FMT_ONELINE && !subject) {
 899                 strbuf_addch(sb, '\n');
 900         }
 901
 902         /* Skip excess blank lines at the beginning of body, if any... */
 903         msg = skip_empty_lines(msg);
 904
 905         /* These formats treat the title line specially. */
 906         if (fmt == CMIT_FMT_ONELINE || fmt == CMIT_FMT_EMAIL)
 907                 pp_title_line(fmt, &msg, sb, subject,
 908                               after_subject, encoding, need_8bit_cte);
 909
 910         beginning_of_body = sb->len;
 911         if (fmt != CMIT_FMT_ONELINE)
 912                 pp_remainder(fmt, &msg, sb, indent);
 913         strbuf_rtrim(sb);
 914
 915         /* Make sure there is an EOLN for the non-oneline case */
 916         if (fmt != CMIT_FMT_ONELINE)
 917                 strbuf_addch(sb, '\n');
 918
 919         /*
 920          * The caller may append additional body text in e-mail
 921          * format.  Make sure we did not strip the blank line
 922          * between the header and the body.
 923          */
 924         if (fmt == CMIT_FMT_EMAIL && sb->len <= beginning_of_body)
 925                 strbuf_addch(sb, '\n');
 926         free(reencoded);
 927 }