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