pretty.c

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