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(struct strbuf *sb, const char *email)
 309 {
 310         static struct string_list *mail_map;
 311         char buffer[1024];
 312
 313         if (!mail_map) {
 314                 mail_map = xcalloc(1, sizeof(*mail_map));
 315                 read_mailmap(mail_map, ".mailmap", NULL);
 316         }
 317
 318         if (!mail_map->nr)
 319                 return -1;
 320
 321         if (!map_email(mail_map, email, buffer, sizeof(buffer)))
 322                 return -1;
 323         strbuf_addstr(sb, buffer);
 324         return 0;
 325 }
 326
 327 static size_t format_person_part(struct strbuf *sb, char part,
 328                                  const char *msg, int len, enum date_mode dmode)
 329 {
 330         /* currently all placeholders have same length */
 331         const int placeholder_len = 2;
 332         int start, end, tz = 0;
 333         unsigned long date = 0;
 334         char *ep;
 335
 336         /* advance 'end' to point to email start delimiter */
 337         for (end = 0; end < len && msg[end] != '<'; end++)
 338                 ; /* do nothing */
 339
 340         /*
 341          * When end points at the '<' that we found, it should have
 342          * matching '>' later, which means 'end' must be strictly
 343          * below len - 1.
 344          */
 345         if (end >= len - 2)
 346                 goto skip;
 347
 348         if (part == 'n' || part == 'N') {       /* name */
 349                 while (end > 0 && isspace(msg[end - 1]))
 350                         end--;
 351                 if (part != 'N' || !msg[end] || !msg[end + 1] ||
 352                     mailmap_name(sb, msg + end + 2) < 0)
 353                         strbuf_add(sb, msg, end);
 354                 return placeholder_len;
 355         }
 356         start = ++end; /* save email start position */
 357
 358         /* advance 'end' to point to email end delimiter */
 359         for ( ; end < len && msg[end] != '>'; end++)
 360                 ; /* do nothing */
 361
 362         if (end >= len)
 363                 goto skip;
 364
 365         if (part == 'e') {      /* email */
 366                 strbuf_add(sb, msg + start, end - start);
 367                 return placeholder_len;
 368         }
 369
 370         /* advance 'start' to point to date start delimiter */
 371         for (start = end + 1; start < len && isspace(msg[start]); start++)
 372                 ; /* do nothing */
 373         if (start >= len)
 374                 goto skip;
 375         date = strtoul(msg + start, &ep, 10);
 376         if (msg + start == ep)
 377                 goto skip;
 378
 379         if (part == 't') {      /* date, UNIX timestamp */
 380                 strbuf_add(sb, msg + start, ep - (msg + start));
 381                 return placeholder_len;
 382         }
 383
 384         /* parse tz */
 385         for (start = ep - msg + 1; start < len && isspace(msg[start]); start++)
 386                 ; /* do nothing */
 387         if (start + 1 < len) {
 388                 tz = strtoul(msg + start + 1, NULL, 10);
 389                 if (msg[start] == '-')
 390                         tz = -tz;
 391         }
 392
 393         switch (part) {
 394         case 'd':       /* date */
 395                 strbuf_addstr(sb, show_date(date, tz, dmode));
 396                 return placeholder_len;
 397         case 'D':       /* date, RFC2822 style */
 398                 strbuf_addstr(sb, show_date(date, tz, DATE_RFC2822));
 399                 return placeholder_len;
 400         case 'r':       /* date, relative */
 401                 strbuf_addstr(sb, show_date(date, tz, DATE_RELATIVE));
 402                 return placeholder_len;
 403         case 'i':       /* date, ISO 8601 */
 404                 strbuf_addstr(sb, show_date(date, tz, DATE_ISO8601));
 405                 return placeholder_len;
 406         }
 407
 408 skip:
 409         /*
 410          * bogus commit, 'sb' cannot be updated, but we still need to
 411          * compute a valid return value.
 412          */
 413         if (part == 'n' || part == 'e' || part == 't' || part == 'd'
 414             || part == 'D' || part == 'r' || part == 'i')
 415                 return placeholder_len;
 416
 417         return 0; /* unknown placeholder */
 418 }
 419
 420 struct chunk {
 421         size_t off;
 422         size_t len;
 423 };
 424
 425 struct format_commit_context {
 426         const struct commit *commit;
 427         enum date_mode dmode;
 428         unsigned commit_header_parsed:1;
 429         unsigned commit_message_parsed:1;
 430
 431         /* These offsets are relative to the start of the commit message. */
 432         struct chunk author;
 433         struct chunk committer;
 434         struct chunk encoding;
 435         size_t message_off;
 436         size_t subject_off;
 437         size_t body_off;
 438
 439         /* The following ones are relative to the result struct strbuf. */
 440         struct chunk abbrev_commit_hash;
 441         struct chunk abbrev_tree_hash;
 442         struct chunk abbrev_parent_hashes;
 443 };
 444
 445 static int add_again(struct strbuf *sb, struct chunk *chunk)
 446 {
 447         if (chunk->len) {
 448                 strbuf_adddup(sb, chunk->off, chunk->len);
 449                 return 1;
 450         }
 451
 452         /*
 453          * We haven't seen this chunk before.  Our caller is surely
 454          * going to add it the hard way now.  Remember the most likely
 455          * start of the to-be-added chunk: the current end of the
 456          * struct strbuf.
 457          */
 458         chunk->off = sb->len;
 459         return 0;
 460 }
 461
 462 static void parse_commit_header(struct format_commit_context *context)
 463 {
 464         const char *msg = context->commit->buffer;
 465         int i;
 466
 467         for (i = 0; msg[i]; i++) {
 468                 int eol;
 469                 for (eol = i; msg[eol] && msg[eol] != '\n'; eol++)
 470                         ; /* do nothing */
 471
 472                 if (i == eol) {
 473                         break;
 474                 } else if (!prefixcmp(msg + i, "author ")) {
 475                         context->author.off = i + 7;
 476                         context->author.len = eol - i - 7;
 477                 } else if (!prefixcmp(msg + i, "committer ")) {
 478                         context->committer.off = i + 10;
 479                         context->committer.len = eol - i - 10;
 480                 } else if (!prefixcmp(msg + i, "encoding ")) {
 481                         context->encoding.off = i + 9;
 482                         context->encoding.len = eol - i - 9;
 483                 }
 484                 i = eol;
 485         }
 486         context->message_off = i;
 487         context->commit_header_parsed = 1;
 488 }
 489
 490 const char *format_subject(struct strbuf *sb, const char *msg,
 491                            const char *line_separator)
 492 {
 493         int first = 1;
 494
 495         for (;;) {
 496                 const char *line = msg;
 497                 int linelen = get_one_line(line);
 498
 499                 msg += linelen;
 500                 if (!linelen || is_empty_line(line, &linelen))
 501                         break;
 502
 503                 if (!sb)
 504                         continue;
 505                 strbuf_grow(sb, linelen + 2);
 506                 if (!first)
 507                         strbuf_addstr(sb, line_separator);
 508                 strbuf_add(sb, line, linelen);
 509                 first = 0;
 510         }
 511         return msg;
 512 }
 513
 514 static void parse_commit_message(struct format_commit_context *c)
 515 {
 516         const char *msg = c->commit->buffer + c->message_off;
 517         const char *start = c->commit->buffer;
 518
 519         msg = skip_empty_lines(msg);
 520         c->subject_off = msg - start;
 521
 522         msg = format_subject(NULL, msg, NULL);
 523         msg = skip_empty_lines(msg);
 524         c->body_off = msg - start;
 525
 526         c->commit_message_parsed = 1;
 527 }
 528
 529 static void format_decoration(struct strbuf *sb, const struct commit *commit)
 530 {
 531         struct name_decoration *d;
 532         const char *prefix = " (";
 533
 534         load_ref_decorations();
 535         d = lookup_decoration(&name_decoration, &commit->object);
 536         while (d) {
 537                 strbuf_addstr(sb, prefix);
 538                 prefix = ", ";
 539                 strbuf_addstr(sb, d->name);
 540                 d = d->next;
 541         }
 542         if (prefix[0] == ',')
 543                 strbuf_addch(sb, ')');
 544 }
 545
 546 static size_t format_commit_item(struct strbuf *sb, const char *placeholder,
 547                                void *context)
 548 {
 549         struct format_commit_context *c = context;
 550         const struct commit *commit = c->commit;
 551         const char *msg = commit->buffer;
 552         struct commit_list *p;
 553         int h1, h2;
 554
 555         /* these are independent of the commit */
 556         switch (placeholder[0]) {
 557         case 'C':
 558                 if (placeholder[1] == '(') {
 559                         const char *end = strchr(placeholder + 2, ')');
 560                         char color[COLOR_MAXLEN];
 561                         if (!end)
 562                                 return 0;
 563                         color_parse_mem(placeholder + 2,
 564                                         end - (placeholder + 2),
 565                                         "--pretty format", color);
 566                         strbuf_addstr(sb, color);
 567                         return end - placeholder + 1;
 568                 }
 569                 if (!prefixcmp(placeholder + 1, "red")) {
 570                         strbuf_addstr(sb, "\033[31m");
 571                         return 4;
 572                 } else if (!prefixcmp(placeholder + 1, "green")) {
 573                         strbuf_addstr(sb, "\033[32m");
 574                         return 6;
 575                 } else if (!prefixcmp(placeholder + 1, "blue")) {
 576                         strbuf_addstr(sb, "\033[34m");
 577                         return 5;
 578                 } else if (!prefixcmp(placeholder + 1, "reset")) {
 579                         strbuf_addstr(sb, "\033[m");
 580                         return 6;
 581                 } else
 582                         return 0;
 583         case 'n':               /* newline */
 584                 strbuf_addch(sb, '\n');
 585                 return 1;
 586         case 'x':
 587                 /* %x00 == NUL, %x0a == LF, etc. */
 588                 if (0 <= (h1 = hexval_table[0xff & placeholder[1]]) &&
 589                     h1 <= 16 &&
 590                     0 <= (h2 = hexval_table[0xff & placeholder[2]]) &&
 591                     h2 <= 16) {
 592                         strbuf_addch(sb, (h1<<4)|h2);
 593                         return 3;
 594                 } else
 595                         return 0;
 596         }
 597
 598         /* these depend on the commit */
 599         if (!commit->object.parsed)
 600                 parse_object(commit->object.sha1);
 601
 602         switch (placeholder[0]) {
 603         case 'H':               /* commit hash */
 604                 strbuf_addstr(sb, sha1_to_hex(commit->object.sha1));
 605                 return 1;
 606         case 'h':               /* abbreviated commit hash */
 607                 if (add_again(sb, &c->abbrev_commit_hash))
 608                         return 1;
 609                 strbuf_addstr(sb, find_unique_abbrev(commit->object.sha1,
 610                                                      DEFAULT_ABBREV));
 611                 c->abbrev_commit_hash.len = sb->len - c->abbrev_commit_hash.off;
 612                 return 1;
 613         case 'T':               /* tree hash */
 614                 strbuf_addstr(sb, sha1_to_hex(commit->tree->object.sha1));
 615                 return 1;
 616         case 't':               /* abbreviated tree hash */
 617                 if (add_again(sb, &c->abbrev_tree_hash))
 618                         return 1;
 619                 strbuf_addstr(sb, find_unique_abbrev(commit->tree->object.sha1,
 620                                                      DEFAULT_ABBREV));
 621                 c->abbrev_tree_hash.len = sb->len - c->abbrev_tree_hash.off;
 622                 return 1;
 623         case 'P':               /* parent hashes */
 624                 for (p = commit->parents; p; p = p->next) {
 625                         if (p != commit->parents)
 626                                 strbuf_addch(sb, ' ');
 627                         strbuf_addstr(sb, sha1_to_hex(p->item->object.sha1));
 628                 }
 629                 return 1;
 630         case 'p':               /* abbreviated parent hashes */
 631                 if (add_again(sb, &c->abbrev_parent_hashes))
 632                         return 1;
 633                 for (p = commit->parents; p; p = p->next) {
 634                         if (p != commit->parents)
 635                                 strbuf_addch(sb, ' ');
 636                         strbuf_addstr(sb, find_unique_abbrev(
 637                                         p->item->object.sha1, DEFAULT_ABBREV));
 638                 }
 639                 c->abbrev_parent_hashes.len = sb->len -
 640                                               c->abbrev_parent_hashes.off;
 641                 return 1;
 642         case 'm':               /* left/right/bottom */
 643                 strbuf_addch(sb, (commit->object.flags & BOUNDARY)
 644                                  ? '-'
 645                                  : (commit->object.flags & SYMMETRIC_LEFT)
 646                                  ? '<'
 647                                  : '>');
 648                 return 1;
 649         case 'd':
 650                 format_decoration(sb, commit);
 651                 return 1;
 652         }
 653
 654         /* For the rest we have to parse the commit header. */
 655         if (!c->commit_header_parsed)
 656                 parse_commit_header(c);
 657
 658         switch (placeholder[0]) {
 659         case 'a':       /* author ... */
 660                 return format_person_part(sb, placeholder[1],
 661                                    msg + c->author.off, c->author.len,
 662                                    c->dmode);
 663         case 'c':       /* committer ... */
 664                 return format_person_part(sb, placeholder[1],
 665                                    msg + c->committer.off, c->committer.len,
 666                                    c->dmode);
 667         case 'e':       /* encoding */
 668                 strbuf_add(sb, msg + c->encoding.off, c->encoding.len);
 669                 return 1;
 670         }
 671
 672         /* Now we need to parse the commit message. */
 673         if (!c->commit_message_parsed)
 674                 parse_commit_message(c);
 675
 676         switch (placeholder[0]) {
 677         case 's':       /* subject */
 678                 format_subject(sb, msg + c->subject_off, " ");
 679                 return 1;
 680         case 'b':       /* body */
 681                 strbuf_addstr(sb, msg + c->body_off);
 682                 return 1;
 683         }
 684         return 0;       /* unknown placeholder */
 685 }
 686
 687 void format_commit_message(const struct commit *commit,
 688                            const void *format, struct strbuf *sb,
 689                            enum date_mode dmode)
 690 {
 691         struct format_commit_context context;
 692
 693         memset(&context, 0, sizeof(context));
 694         context.commit = commit;
 695         context.dmode = dmode;
 696         strbuf_expand(sb, format, format_commit_item, &context);
 697 }
 698
 699 static void pp_header(enum cmit_fmt fmt,
 700                       int abbrev,
 701                       enum date_mode dmode,
 702                       const char *encoding,
 703                       const struct commit *commit,
 704                       const char **msg_p,
 705                       struct strbuf *sb)
 706 {
 707         int parents_shown = 0;
 708
 709         for (;;) {
 710                 const char *line = *msg_p;
 711                 int linelen = get_one_line(*msg_p);
 712
 713                 if (!linelen)
 714                         return;
 715                 *msg_p += linelen;
 716
 717                 if (linelen == 1)
 718                         /* End of header */
 719                         return;
 720
 721                 if (fmt == CMIT_FMT_RAW) {
 722                         strbuf_add(sb, line, linelen);
 723                         continue;
 724                 }
 725
 726                 if (!memcmp(line, "parent ", 7)) {
 727                         if (linelen != 48)
 728                                 die("bad parent line in commit");
 729                         continue;
 730                 }
 731
 732                 if (!parents_shown) {
 733                         struct commit_list *parent;
 734                         int num;
 735                         for (parent = commit->parents, num = 0;
 736                              parent;
 737                              parent = parent->next, num++)
 738                                 ;
 739                         /* with enough slop */
 740                         strbuf_grow(sb, num * 50 + 20);
 741                         add_merge_info(fmt, sb, commit, abbrev);
 742                         parents_shown = 1;
 743                 }
 744
 745                 /*
 746                  * MEDIUM == DEFAULT shows only author with dates.
 747                  * FULL shows both authors but not dates.
 748                  * FULLER shows both authors and dates.
 749                  */
 750                 if (!memcmp(line, "author ", 7)) {
 751                         strbuf_grow(sb, linelen + 80);
 752                         pp_user_info("Author", fmt, sb, line + 7, dmode, encoding);
 753                 }
 754                 if (!memcmp(line, "committer ", 10) &&
 755                     (fmt == CMIT_FMT_FULL || fmt == CMIT_FMT_FULLER)) {
 756                         strbuf_grow(sb, linelen + 80);
 757                         pp_user_info("Commit", fmt, sb, line + 10, dmode, encoding);
 758                 }
 759         }
 760 }
 761
 762 void pp_title_line(enum cmit_fmt fmt,
 763                    const char **msg_p,
 764                    struct strbuf *sb,
 765                    const char *subject,
 766                    const char *after_subject,
 767                    const char *encoding,
 768                    int need_8bit_cte)
 769 {
 770         const char *line_separator = (fmt == CMIT_FMT_EMAIL) ? "\n " : " ";
 771         struct strbuf title;
 772
 773         strbuf_init(&title, 80);
 774         *msg_p = format_subject(&title, *msg_p, line_separator);
 775
 776         strbuf_grow(sb, title.len + 1024);
 777         if (subject) {
 778                 strbuf_addstr(sb, subject);
 779                 add_rfc2047(sb, title.buf, title.len, encoding);
 780         } else {
 781                 strbuf_addbuf(sb, &title);
 782         }
 783         strbuf_addch(sb, '\n');
 784
 785         if (need_8bit_cte > 0) {
 786                 const char *header_fmt =
 787                         "MIME-Version: 1.0\n"
 788                         "Content-Type: text/plain; charset=%s\n"
 789                         "Content-Transfer-Encoding: 8bit\n";
 790                 strbuf_addf(sb, header_fmt, encoding);
 791         }
 792         if (after_subject) {
 793                 strbuf_addstr(sb, after_subject);
 794         }
 795         if (fmt == CMIT_FMT_EMAIL) {
 796                 strbuf_addch(sb, '\n');
 797         }
 798         strbuf_release(&title);
 799 }
 800
 801 void pp_remainder(enum cmit_fmt fmt,
 802                   const char **msg_p,
 803                   struct strbuf *sb,
 804                   int indent)
 805 {
 806         int first = 1;
 807         for (;;) {
 808                 const char *line = *msg_p;
 809                 int linelen = get_one_line(line);
 810                 *msg_p += linelen;
 811
 812                 if (!linelen)
 813                         break;
 814
 815                 if (is_empty_line(line, &linelen)) {
 816                         if (first)
 817                                 continue;
 818                         if (fmt == CMIT_FMT_SHORT)
 819                                 break;
 820                 }
 821                 first = 0;
 822
 823                 strbuf_grow(sb, linelen + indent + 20);
 824                 if (indent) {
 825                         memset(sb->buf + sb->len, ' ', indent);
 826                         strbuf_setlen(sb, sb->len + indent);
 827                 }
 828                 strbuf_add(sb, line, linelen);
 829                 strbuf_addch(sb, '\n');
 830         }
 831 }
 832
 833 char *reencode_commit_message(const struct commit *commit, const char **encoding_p)
 834 {
 835         const char *encoding;
 836
 837         encoding = (git_log_output_encoding
 838                     ? git_log_output_encoding
 839                     : git_commit_encoding);
 840         if (!encoding)
 841                 encoding = "utf-8";
 842         if (encoding_p)
 843                 *encoding_p = encoding;
 844         return logmsg_reencode(commit, encoding);
 845 }
 846
 847 void pretty_print_commit(enum cmit_fmt fmt, const struct commit *commit,
 848                          struct strbuf *sb, int abbrev,
 849                          const char *subject, const char *after_subject,
 850                          enum date_mode dmode, int need_8bit_cte)
 851 {
 852         unsigned long beginning_of_body;
 853         int indent = 4;
 854         const char *msg = commit->buffer;
 855         char *reencoded;
 856         const char *encoding;
 857
 858         if (fmt == CMIT_FMT_USERFORMAT) {
 859                 format_commit_message(commit, user_format, sb, dmode);
 860                 return;
 861         }
 862
 863         reencoded = reencode_commit_message(commit, &encoding);
 864         if (reencoded) {
 865                 msg = reencoded;
 866         }
 867
 868         if (fmt == CMIT_FMT_ONELINE || fmt == CMIT_FMT_EMAIL)
 869                 indent = 0;
 870
 871         /*
 872          * We need to check and emit Content-type: to mark it
 873          * as 8-bit if we haven't done so.
 874          */
 875         if (fmt == CMIT_FMT_EMAIL && need_8bit_cte == 0) {
 876                 int i, ch, in_body;
 877
 878                 for (in_body = i = 0; (ch = msg[i]); i++) {
 879                         if (!in_body) {
 880                                 /* author could be non 7-bit ASCII but
 881                                  * the log may be so; skip over the
 882                                  * header part first.
 883                                  */
 884                                 if (ch == '\n' && msg[i+1] == '\n')
 885                                         in_body = 1;
 886                         }
 887                         else if (non_ascii(ch)) {
 888                                 need_8bit_cte = 1;
 889                                 break;
 890                         }
 891                 }
 892         }
 893
 894         pp_header(fmt, abbrev, dmode, encoding, commit, &msg, sb);
 895         if (fmt != CMIT_FMT_ONELINE && !subject) {
 896                 strbuf_addch(sb, '\n');
 897         }
 898
 899         /* Skip excess blank lines at the beginning of body, if any... */
 900         msg = skip_empty_lines(msg);
 901
 902         /* These formats treat the title line specially. */
 903         if (fmt == CMIT_FMT_ONELINE || fmt == CMIT_FMT_EMAIL)
 904                 pp_title_line(fmt, &msg, sb, subject,
 905                               after_subject, encoding, need_8bit_cte);
 906
 907         beginning_of_body = sb->len;
 908         if (fmt != CMIT_FMT_ONELINE)
 909                 pp_remainder(fmt, &msg, sb, indent);
 910         strbuf_rtrim(sb);
 911
 912         /* Make sure there is an EOLN for the non-oneline case */
 913         if (fmt != CMIT_FMT_ONELINE)
 914                 strbuf_addch(sb, '\n');
 915
 916         /*
 917          * The caller may append additional body text in e-mail
 918          * format.  Make sure we did not strip the blank line
 919          * between the header and the body.
 920          */
 921         if (fmt == CMIT_FMT_EMAIL && sb->len <= beginning_of_body)
 922                 strbuf_addch(sb, '\n');
 923         free(reencoded);
 924 }