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