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