git.oblomov.eu Git - git/blob - pretty.c

   1 #include "cache.h"
   2 #include "config.h"
   3 #include "commit.h"
   4 #include "utf8.h"
   5 #include "diff.h"
   6 #include "revision.h"
   7 #include "string-list.h"
   8 #include "mailmap.h"
   9 #include "log-tree.h"
  10 #include "notes.h"
  11 #include "color.h"
  12 #include "reflog-walk.h"
  13 #include "gpg-interface.h"
  14 #include "trailer.h"
  15 #include "run-command.h"
  16
  17 static char *user_format;
  18 static struct cmt_fmt_map {
  19         const char *name;
  20         enum cmit_fmt format;
  21         int is_tformat;
  22         int expand_tabs_in_log;
  23         int is_alias;
  24         enum date_mode_type default_date_mode_type;
  25         const char *user_format;
  26 } *commit_formats;
  27 static size_t builtin_formats_len;
  28 static size_t commit_formats_len;
  29 static size_t commit_formats_alloc;
  30 static struct cmt_fmt_map *find_commit_format(const char *sought);
  31
  32 int commit_format_is_empty(enum cmit_fmt fmt)
  33 {
  34         return fmt == CMIT_FMT_USERFORMAT && !*user_format;
  35 }
  36
  37 static void save_user_format(struct rev_info *rev, const char *cp, int is_tformat)
  38 {
  39         free(user_format);
  40         user_format = xstrdup(cp);
  41         if (is_tformat)
  42                 rev->use_terminator = 1;
  43         rev->commit_format = CMIT_FMT_USERFORMAT;
  44 }
  45
  46 static int git_pretty_formats_config(const char *var, const char *value, void *cb)
  47 {
  48         struct cmt_fmt_map *commit_format = NULL;
  49         const char *name;
  50         const char *fmt;
  51         int i;
  52
  53         if (!skip_prefix(var, "pretty.", &name))
  54                 return 0;
  55
  56         for (i = 0; i < builtin_formats_len; i++) {
  57                 if (!strcmp(commit_formats[i].name, name))
  58                         return 0;
  59         }
  60
  61         for (i = builtin_formats_len; i < commit_formats_len; i++) {
  62                 if (!strcmp(commit_formats[i].name, name)) {
  63                         commit_format = &commit_formats[i];
  64                         break;
  65                 }
  66         }
  67
  68         if (!commit_format) {
  69                 ALLOC_GROW(commit_formats, commit_formats_len+1,
  70                            commit_formats_alloc);
  71                 commit_format = &commit_formats[commit_formats_len];
  72                 memset(commit_format, 0, sizeof(*commit_format));
  73                 commit_formats_len++;
  74         }
  75
  76         commit_format->name = xstrdup(name);
  77         commit_format->format = CMIT_FMT_USERFORMAT;
  78         if (git_config_string(&fmt, var, value))
  79                 return -1;
  80
  81         if (skip_prefix(fmt, "format:", &fmt))
  82                 commit_format->is_tformat = 0;
  83         else if (skip_prefix(fmt, "tformat:", &fmt) || strchr(fmt, '%'))
  84                 commit_format->is_tformat = 1;
  85         else
  86                 commit_format->is_alias = 1;
  87         commit_format->user_format = fmt;
  88
  89         return 0;
  90 }
  91
  92 static void setup_commit_formats(void)
  93 {
  94         struct cmt_fmt_map builtin_formats[] = {
  95                 { "raw",        CMIT_FMT_RAW,           0,      0 },
  96                 { "medium",     CMIT_FMT_MEDIUM,        0,      8 },
  97                 { "short",      CMIT_FMT_SHORT,         0,      0 },
  98                 { "email",      CMIT_FMT_EMAIL,         0,      0 },
  99                 { "mboxrd",     CMIT_FMT_MBOXRD,        0,      0 },
 100                 { "fuller",     CMIT_FMT_FULLER,        0,      8 },
 101                 { "full",       CMIT_FMT_FULL,          0,      8 },
 102                 { "oneline",    CMIT_FMT_ONELINE,       1,      0 },
 103                 { "reference",  CMIT_FMT_USERFORMAT,    1,      0,
 104                         0, DATE_SHORT, "%C(auto)%h (%s, %ad)" },
 105                 /*
 106                  * Please update $__git_log_pretty_formats in
 107                  * git-completion.bash when you add new formats.
 108                  */
 109         };
 110         commit_formats_len = ARRAY_SIZE(builtin_formats);
 111         builtin_formats_len = commit_formats_len;
 112         ALLOC_GROW(commit_formats, commit_formats_len, commit_formats_alloc);
 113         COPY_ARRAY(commit_formats, builtin_formats,
 114                    ARRAY_SIZE(builtin_formats));
 115
 116         git_config(git_pretty_formats_config, NULL);
 117 }
 118
 119 static struct cmt_fmt_map *find_commit_format_recursive(const char *sought,
 120                                                         const char *original,
 121                                                         int num_redirections)
 122 {
 123         struct cmt_fmt_map *found = NULL;
 124         size_t found_match_len = 0;
 125         int i;
 126
 127         if (num_redirections >= commit_formats_len)
 128                 die("invalid --pretty format: "
 129                     "'%s' references an alias which points to itself",
 130                     original);
 131
 132         for (i = 0; i < commit_formats_len; i++) {
 133                 size_t match_len;
 134
 135                 if (!starts_with(commit_formats[i].name, sought))
 136                         continue;
 137
 138                 match_len = strlen(commit_formats[i].name);
 139                 if (found == NULL || found_match_len > match_len) {
 140                         found = &commit_formats[i];
 141                         found_match_len = match_len;
 142                 }
 143         }
 144
 145         if (found && found->is_alias) {
 146                 found = find_commit_format_recursive(found->user_format,
 147                                                      original,
 148                                                      num_redirections+1);
 149         }
 150
 151         return found;
 152 }
 153
 154 static struct cmt_fmt_map *find_commit_format(const char *sought)
 155 {
 156         if (!commit_formats)
 157                 setup_commit_formats();
 158
 159         return find_commit_format_recursive(sought, sought, 0);
 160 }
 161
 162 void get_commit_format(const char *arg, struct rev_info *rev)
 163 {
 164         struct cmt_fmt_map *commit_format;
 165
 166         rev->use_terminator = 0;
 167         if (!arg) {
 168                 rev->commit_format = CMIT_FMT_DEFAULT;
 169                 return;
 170         }
 171         if (skip_prefix(arg, "format:", &arg)) {
 172                 save_user_format(rev, arg, 0);
 173                 return;
 174         }
 175
 176         if (!*arg || skip_prefix(arg, "tformat:", &arg) || strchr(arg, '%')) {
 177                 save_user_format(rev, arg, 1);
 178                 return;
 179         }
 180
 181         commit_format = find_commit_format(arg);
 182         if (!commit_format)
 183                 die("invalid --pretty format: %s", arg);
 184
 185         rev->commit_format = commit_format->format;
 186         rev->use_terminator = commit_format->is_tformat;
 187         rev->expand_tabs_in_log_default = commit_format->expand_tabs_in_log;
 188         if (!rev->date_mode_explicit && commit_format->default_date_mode_type)
 189                 rev->date_mode.type = commit_format->default_date_mode_type;
 190         if (commit_format->format == CMIT_FMT_USERFORMAT) {
 191                 save_user_format(rev, commit_format->user_format,
 192                                  commit_format->is_tformat);
 193         }
 194 }
 195
 196 /*
 197  * Generic support for pretty-printing the header
 198  */
 199 static int get_one_line(const char *msg)
 200 {
 201         int ret = 0;
 202
 203         for (;;) {
 204                 char c = *msg++;
 205                 if (!c)
 206                         break;
 207                 ret++;
 208                 if (c == '\n')
 209                         break;
 210         }
 211         return ret;
 212 }
 213
 214 /* High bit set, or ISO-2022-INT */
 215 static int non_ascii(int ch)
 216 {
 217         return !isascii(ch) || ch == '\033';
 218 }
 219
 220 int has_non_ascii(const char *s)
 221 {
 222         int ch;
 223         if (!s)
 224                 return 0;
 225         while ((ch = *s++) != '\0') {
 226                 if (non_ascii(ch))
 227                         return 1;
 228         }
 229         return 0;
 230 }
 231
 232 static int is_rfc822_special(char ch)
 233 {
 234         switch (ch) {
 235         case '(':
 236         case ')':
 237         case '<':
 238         case '>':
 239         case '[':
 240         case ']':
 241         case ':':
 242         case ';':
 243         case '@':
 244         case ',':
 245         case '.':
 246         case '"':
 247         case '\\':
 248                 return 1;
 249         default:
 250                 return 0;
 251         }
 252 }
 253
 254 static int needs_rfc822_quoting(const char *s, int len)
 255 {
 256         int i;
 257         for (i = 0; i < len; i++)
 258                 if (is_rfc822_special(s[i]))
 259                         return 1;
 260         return 0;
 261 }
 262
 263 static int last_line_length(struct strbuf *sb)
 264 {
 265         int i;
 266
 267         /* How many bytes are already used on the last line? */
 268         for (i = sb->len - 1; i >= 0; i--)
 269                 if (sb->buf[i] == '\n')
 270                         break;
 271         return sb->len - (i + 1);
 272 }
 273
 274 static void add_rfc822_quoted(struct strbuf *out, const char *s, int len)
 275 {
 276         int i;
 277
 278         /* just a guess, we may have to also backslash-quote */
 279         strbuf_grow(out, len + 2);
 280
 281         strbuf_addch(out, '"');
 282         for (i = 0; i < len; i++) {
 283                 switch (s[i]) {
 284                 case '"':
 285                 case '\\':
 286                         strbuf_addch(out, '\\');
 287                         /* fall through */
 288                 default:
 289                         strbuf_addch(out, s[i]);
 290                 }
 291         }
 292         strbuf_addch(out, '"');
 293 }
 294
 295 enum rfc2047_type {
 296         RFC2047_SUBJECT,
 297         RFC2047_ADDRESS
 298 };
 299
 300 static int is_rfc2047_special(char ch, enum rfc2047_type type)
 301 {
 302         /*
 303          * rfc2047, section 4.2:
 304          *
 305          *    8-bit values which correspond to printable ASCII characters other
 306          *    than "=", "?", and "_" (underscore), MAY be represented as those
 307          *    characters.  (But see section 5 for restrictions.)  In
 308          *    particular, SPACE and TAB MUST NOT be represented as themselves
 309          *    within encoded words.
 310          */
 311
 312         /*
 313          * rule out non-ASCII characters and non-printable characters (the
 314          * non-ASCII check should be redundant as isprint() is not localized
 315          * and only knows about ASCII, but be defensive about that)
 316          */
 317         if (non_ascii(ch) || !isprint(ch))
 318                 return 1;
 319
 320         /*
 321          * rule out special printable characters (' ' should be the only
 322          * whitespace character considered printable, but be defensive and use
 323          * isspace())
 324          */
 325         if (isspace(ch) || ch == '=' || ch == '?' || ch == '_')
 326                 return 1;
 327
 328         /*
 329          * rfc2047, section 5.3:
 330          *
 331          *    As a replacement for a 'word' entity within a 'phrase', for example,
 332          *    one that precedes an address in a From, To, or Cc header.  The ABNF
 333          *    definition for 'phrase' from RFC 822 thus becomes:
 334          *
 335          *    phrase = 1*( encoded-word / word )
 336          *
 337          *    In this case the set of characters that may be used in a "Q"-encoded
 338          *    'encoded-word' is restricted to: <upper and lower case ASCII
 339          *    letters, decimal digits, "!", "*", "+", "-", "/", "=", and "_"
 340          *    (underscore, ASCII 95.)>.  An 'encoded-word' that appears within a
 341          *    'phrase' MUST be separated from any adjacent 'word', 'text' or
 342          *    'special' by 'linear-white-space'.
 343          */
 344
 345         if (type != RFC2047_ADDRESS)
 346                 return 0;
 347
 348         /* '=' and '_' are special cases and have been checked above */
 349         return !(isalnum(ch) || ch == '!' || ch == '*' || ch == '+' || ch == '-' || ch == '/');
 350 }
 351
 352 static int needs_rfc2047_encoding(const char *line, int len)
 353 {
 354         int i;
 355
 356         for (i = 0; i < len; i++) {
 357                 int ch = line[i];
 358                 if (non_ascii(ch) || ch == '\n')
 359                         return 1;
 360                 if ((i + 1 < len) && (ch == '=' && line[i+1] == '?'))
 361                         return 1;
 362         }
 363
 364         return 0;
 365 }
 366
 367 static void add_rfc2047(struct strbuf *sb, const char *line, size_t len,
 368                        const char *encoding, enum rfc2047_type type)
 369 {
 370         static const int max_encoded_length = 76; /* per rfc2047 */
 371         int i;
 372         int line_len = last_line_length(sb);
 373
 374         strbuf_grow(sb, len * 3 + strlen(encoding) + 100);
 375         strbuf_addf(sb, "=?%s?q?", encoding);
 376         line_len += strlen(encoding) + 5; /* 5 for =??q? */
 377
 378         while (len) {
 379                 /*
 380                  * RFC 2047, section 5 (3):
 381                  *
 382                  * Each 'encoded-word' MUST represent an integral number of
 383                  * characters.  A multi-octet character may not be split across
 384                  * adjacent 'encoded- word's.
 385                  */
 386                 const unsigned char *p = (const unsigned char *)line;
 387                 int chrlen = mbs_chrlen(&line, &len, encoding);
 388                 int is_special = (chrlen > 1) || is_rfc2047_special(*p, type);
 389
 390                 /* "=%02X" * chrlen, or the byte itself */
 391                 const char *encoded_fmt = is_special ? "=%02X"    : "%c";
 392                 int         encoded_len = is_special ? 3 * chrlen : 1;
 393
 394                 /*
 395                  * According to RFC 2047, we could encode the special character
 396                  * ' ' (space) with '_' (underscore) for readability. But many
 397                  * programs do not understand this and just leave the
 398                  * underscore in place. Thus, we do nothing special here, which
 399                  * causes ' ' to be encoded as '=20', avoiding this problem.
 400                  */
 401
 402                 if (line_len + encoded_len + 2 > max_encoded_length) {
 403                         /* It won't fit with trailing "?=" --- break the line */
 404                         strbuf_addf(sb, "?=\n =?%s?q?", encoding);
 405                         line_len = strlen(encoding) + 5 + 1; /* =??q? plus SP */
 406                 }
 407
 408                 for (i = 0; i < chrlen; i++)
 409                         strbuf_addf(sb, encoded_fmt, p[i]);
 410                 line_len += encoded_len;
 411         }
 412         strbuf_addstr(sb, "?=");
 413 }
 414
 415 const char *show_ident_date(const struct ident_split *ident,
 416                             const struct date_mode *mode)
 417 {
 418         timestamp_t date = 0;
 419         long tz = 0;
 420
 421         if (ident->date_begin && ident->date_end)
 422                 date = parse_timestamp(ident->date_begin, NULL, 10);
 423         if (date_overflows(date))
 424                 date = 0;
 425         else {
 426                 if (ident->tz_begin && ident->tz_end)
 427                         tz = strtol(ident->tz_begin, NULL, 10);
 428                 if (tz >= INT_MAX || tz <= INT_MIN)
 429                         tz = 0;
 430         }
 431         return show_date(date, tz, mode);
 432 }
 433
 434 void pp_user_info(struct pretty_print_context *pp,
 435                   const char *what, struct strbuf *sb,
 436                   const char *line, const char *encoding)
 437 {
 438         struct ident_split ident;
 439         char *line_end;
 440         const char *mailbuf, *namebuf;
 441         size_t namelen, maillen;
 442         int max_length = 78; /* per rfc2822 */
 443
 444         if (pp->fmt == CMIT_FMT_ONELINE)
 445                 return;
 446
 447         line_end = strchrnul(line, '\n');
 448         if (split_ident_line(&ident, line, line_end - line))
 449                 return;
 450
 451         mailbuf = ident.mail_begin;
 452         maillen = ident.mail_end - ident.mail_begin;
 453         namebuf = ident.name_begin;
 454         namelen = ident.name_end - ident.name_begin;
 455
 456         if (pp->mailmap)
 457                 map_user(pp->mailmap, &mailbuf, &maillen, &namebuf, &namelen);
 458
 459         if (cmit_fmt_is_mail(pp->fmt)) {
 460                 if (pp->from_ident && ident_cmp(pp->from_ident, &ident)) {
 461                         struct strbuf buf = STRBUF_INIT;
 462
 463                         strbuf_addstr(&buf, "From: ");
 464                         strbuf_add(&buf, namebuf, namelen);
 465                         strbuf_addstr(&buf, " <");
 466                         strbuf_add(&buf, mailbuf, maillen);
 467                         strbuf_addstr(&buf, ">\n");
 468                         string_list_append(&pp->in_body_headers,
 469                                            strbuf_detach(&buf, NULL));
 470
 471                         mailbuf = pp->from_ident->mail_begin;
 472                         maillen = pp->from_ident->mail_end - mailbuf;
 473                         namebuf = pp->from_ident->name_begin;
 474                         namelen = pp->from_ident->name_end - namebuf;
 475                 }
 476
 477                 strbuf_addstr(sb, "From: ");
 478                 if (pp->encode_email_headers &&
 479                     needs_rfc2047_encoding(namebuf, namelen)) {
 480                         add_rfc2047(sb, namebuf, namelen,
 481                                     encoding, RFC2047_ADDRESS);
 482                         max_length = 76; /* per rfc2047 */
 483                 } else if (needs_rfc822_quoting(namebuf, namelen)) {
 484                         struct strbuf quoted = STRBUF_INIT;
 485                         add_rfc822_quoted(&quoted, namebuf, namelen);
 486                         strbuf_add_wrapped_bytes(sb, quoted.buf, quoted.len,
 487                                                         -6, 1, max_length);
 488                         strbuf_release(&quoted);
 489                 } else {
 490                         strbuf_add_wrapped_bytes(sb, namebuf, namelen,
 491                                                  -6, 1, max_length);
 492                 }
 493
 494                 if (max_length <
 495                     last_line_length(sb) + strlen(" <") + maillen + strlen(">"))
 496                         strbuf_addch(sb, '\n');
 497                 strbuf_addf(sb, " <%.*s>\n", (int)maillen, mailbuf);
 498         } else {
 499                 strbuf_addf(sb, "%s: %.*s%.*s <%.*s>\n", what,
 500                             (pp->fmt == CMIT_FMT_FULLER) ? 4 : 0, "    ",
 501                             (int)namelen, namebuf, (int)maillen, mailbuf);
 502         }
 503
 504         switch (pp->fmt) {
 505         case CMIT_FMT_MEDIUM:
 506                 strbuf_addf(sb, "Date:   %s\n",
 507                             show_ident_date(&ident, &pp->date_mode));
 508                 break;
 509         case CMIT_FMT_EMAIL:
 510         case CMIT_FMT_MBOXRD:
 511                 strbuf_addf(sb, "Date: %s\n",
 512                             show_ident_date(&ident, DATE_MODE(RFC2822)));
 513                 break;
 514         case CMIT_FMT_FULLER:
 515                 strbuf_addf(sb, "%sDate: %s\n", what,
 516                             show_ident_date(&ident, &pp->date_mode));
 517                 break;
 518         default:
 519                 /* notin' */
 520                 break;
 521         }
 522 }
 523
 524 static int is_blank_line(const char *line, int *len_p)
 525 {
 526         int len = *len_p;
 527         while (len && isspace(line[len - 1]))
 528                 len--;
 529         *len_p = len;
 530         return !len;
 531 }
 532
 533 const char *skip_blank_lines(const char *msg)
 534 {
 535         for (;;) {
 536                 int linelen = get_one_line(msg);
 537                 int ll = linelen;
 538                 if (!linelen)
 539                         break;
 540                 if (!is_blank_line(msg, &ll))
 541                         break;
 542                 msg += linelen;
 543         }
 544         return msg;
 545 }
 546
 547 static void add_merge_info(const struct pretty_print_context *pp,
 548                            struct strbuf *sb, const struct commit *commit)
 549 {
 550         struct commit_list *parent = commit->parents;
 551
 552         if ((pp->fmt == CMIT_FMT_ONELINE) || (cmit_fmt_is_mail(pp->fmt)) ||
 553             !parent || !parent->next)
 554                 return;
 555
 556         strbuf_addstr(sb, "Merge:");
 557
 558         while (parent) {
 559                 struct object_id *oidp = &parent->item->object.oid;
 560                 strbuf_addch(sb, ' ');
 561                 if (pp->abbrev)
 562                         strbuf_add_unique_abbrev(sb, oidp, pp->abbrev);
 563                 else
 564                         strbuf_addstr(sb, oid_to_hex(oidp));
 565                 parent = parent->next;
 566         }
 567         strbuf_addch(sb, '\n');
 568 }
 569
 570 static char *get_header(const char *msg, const char *key)
 571 {
 572         size_t len;
 573         const char *v = find_commit_header(msg, key, &len);
 574         return v ? xmemdupz(v, len) : NULL;
 575 }
 576
 577 static char *replace_encoding_header(char *buf, const char *encoding)
 578 {
 579         struct strbuf tmp = STRBUF_INIT;
 580         size_t start, len;
 581         char *cp = buf;
 582
 583         /* guess if there is an encoding header before a \n\n */
 584         while (!starts_with(cp, "encoding ")) {
 585                 cp = strchr(cp, '\n');
 586                 if (!cp || *++cp == '\n')
 587                         return buf;
 588         }
 589         start = cp - buf;
 590         cp = strchr(cp, '\n');
 591         if (!cp)
 592                 return buf; /* should not happen but be defensive */
 593         len = cp + 1 - (buf + start);
 594
 595         strbuf_attach(&tmp, buf, strlen(buf), strlen(buf) + 1);
 596         if (is_encoding_utf8(encoding)) {
 597                 /* we have re-coded to UTF-8; drop the header */
 598                 strbuf_remove(&tmp, start, len);
 599         } else {
 600                 /* just replaces XXXX in 'encoding XXXX\n' */
 601                 strbuf_splice(&tmp, start + strlen("encoding "),
 602                                           len - strlen("encoding \n"),
 603                                           encoding, strlen(encoding));
 604         }
 605         return strbuf_detach(&tmp, NULL);
 606 }
 607
 608 const char *repo_logmsg_reencode(struct repository *r,
 609                                  const struct commit *commit,
 610                                  char **commit_encoding,
 611                                  const char *output_encoding)
 612 {
 613         static const char *utf8 = "UTF-8";
 614         const char *use_encoding;
 615         char *encoding;
 616         const char *msg = repo_get_commit_buffer(r, commit, NULL);
 617         char *out;
 618
 619         if (!output_encoding || !*output_encoding) {
 620                 if (commit_encoding)
 621                         *commit_encoding = get_header(msg, "encoding");
 622                 return msg;
 623         }
 624         encoding = get_header(msg, "encoding");
 625         if (commit_encoding)
 626                 *commit_encoding = encoding;
 627         use_encoding = encoding ? encoding : utf8;
 628         if (same_encoding(use_encoding, output_encoding)) {
 629                 /*
 630                  * No encoding work to be done. If we have no encoding header
 631                  * at all, then there's nothing to do, and we can return the
 632                  * message verbatim (whether newly allocated or not).
 633                  */
 634                 if (!encoding)
 635                         return msg;
 636
 637                 /*
 638                  * Otherwise, we still want to munge the encoding header in the
 639                  * result, which will be done by modifying the buffer. If we
 640                  * are using a fresh copy, we can reuse it. But if we are using
 641                  * the cached copy from get_commit_buffer, we need to duplicate it
 642                  * to avoid munging the cached copy.
 643                  */
 644                 if (msg == get_cached_commit_buffer(r, commit, NULL))
 645                         out = xstrdup(msg);
 646                 else
 647                         out = (char *)msg;
 648         }
 649         else {
 650                 /*
 651                  * There's actual encoding work to do. Do the reencoding, which
 652                  * still leaves the header to be replaced in the next step. At
 653                  * this point, we are done with msg. If we allocated a fresh
 654                  * copy, we can free it.
 655                  */
 656                 out = reencode_string(msg, output_encoding, use_encoding);
 657                 if (out)
 658                         repo_unuse_commit_buffer(r, commit, msg);
 659         }
 660
 661         /*
 662          * This replacement actually consumes the buffer we hand it, so we do
 663          * not have to worry about freeing the old "out" here.
 664          */
 665         if (out)
 666                 out = replace_encoding_header(out, output_encoding);
 667
 668         if (!commit_encoding)
 669                 free(encoding);
 670         /*
 671          * If the re-encoding failed, out might be NULL here; in that
 672          * case we just return the commit message verbatim.
 673          */
 674         return out ? out : msg;
 675 }
 676
 677 static int mailmap_name(const char **email, size_t *email_len,
 678                         const char **name, size_t *name_len)
 679 {
 680         static struct string_list *mail_map;
 681         if (!mail_map) {
 682                 CALLOC_ARRAY(mail_map, 1);
 683                 read_mailmap(mail_map);
 684         }
 685         return mail_map->nr && map_user(mail_map, email, email_len, name, name_len);
 686 }
 687
 688 static size_t format_person_part(struct strbuf *sb, char part,
 689                                  const char *msg, int len,
 690                                  const struct date_mode *dmode)
 691 {
 692         /* currently all placeholders have same length */
 693         const int placeholder_len = 2;
 694         struct ident_split s;
 695         const char *name, *mail;
 696         size_t maillen, namelen;
 697
 698         if (split_ident_line(&s, msg, len) < 0)
 699                 goto skip;
 700
 701         name = s.name_begin;
 702         namelen = s.name_end - s.name_begin;
 703         mail = s.mail_begin;
 704         maillen = s.mail_end - s.mail_begin;
 705
 706         if (part == 'N' || part == 'E' || part == 'L') /* mailmap lookup */
 707                 mailmap_name(&mail, &maillen, &name, &namelen);
 708         if (part == 'n' || part == 'N') {       /* name */
 709                 strbuf_add(sb, name, namelen);
 710                 return placeholder_len;
 711         }
 712         if (part == 'e' || part == 'E') {       /* email */
 713                 strbuf_add(sb, mail, maillen);
 714                 return placeholder_len;
 715         }
 716         if (part == 'l' || part == 'L') {       /* local-part */
 717                 const char *at = memchr(mail, '@', maillen);
 718                 if (at)
 719                         maillen = at - mail;
 720                 strbuf_add(sb, mail, maillen);
 721                 return placeholder_len;
 722         }
 723
 724         if (!s.date_begin)
 725                 goto skip;
 726
 727         if (part == 't') {      /* date, UNIX timestamp */
 728                 strbuf_add(sb, s.date_begin, s.date_end - s.date_begin);
 729                 return placeholder_len;
 730         }
 731
 732         switch (part) {
 733         case 'd':       /* date */
 734                 strbuf_addstr(sb, show_ident_date(&s, dmode));
 735                 return placeholder_len;
 736         case 'D':       /* date, RFC2822 style */
 737                 strbuf_addstr(sb, show_ident_date(&s, DATE_MODE(RFC2822)));
 738                 return placeholder_len;
 739         case 'r':       /* date, relative */
 740                 strbuf_addstr(sb, show_ident_date(&s, DATE_MODE(RELATIVE)));
 741                 return placeholder_len;
 742         case 'i':       /* date, ISO 8601-like */
 743                 strbuf_addstr(sb, show_ident_date(&s, DATE_MODE(ISO8601)));
 744                 return placeholder_len;
 745         case 'I':       /* date, ISO 8601 strict */
 746                 strbuf_addstr(sb, show_ident_date(&s, DATE_MODE(ISO8601_STRICT)));
 747                 return placeholder_len;
 748         case 'h':       /* date, human */
 749                 strbuf_addstr(sb, show_ident_date(&s, DATE_MODE(HUMAN)));
 750                 return placeholder_len;
 751         case 's':
 752                 strbuf_addstr(sb, show_ident_date(&s, DATE_MODE(SHORT)));
 753                 return placeholder_len;
 754         }
 755
 756 skip:
 757         /*
 758          * reading from either a bogus commit, or a reflog entry with
 759          * %gn, %ge, etc.; 'sb' cannot be updated, but we still need
 760          * to compute a valid return value.
 761          */
 762         if (part == 'n' || part == 'e' || part == 't' || part == 'd'
 763             || part == 'D' || part == 'r' || part == 'i')
 764                 return placeholder_len;
 765
 766         return 0; /* unknown placeholder */
 767 }
 768
 769 struct chunk {
 770         size_t off;
 771         size_t len;
 772 };
 773
 774 enum flush_type {
 775         no_flush,
 776         flush_right,
 777         flush_left,
 778         flush_left_and_steal,
 779         flush_both
 780 };
 781
 782 enum trunc_type {
 783         trunc_none,
 784         trunc_left,
 785         trunc_middle,
 786         trunc_right
 787 };
 788
 789 struct format_commit_context {
 790         struct repository *repository;
 791         const struct commit *commit;
 792         const struct pretty_print_context *pretty_ctx;
 793         unsigned commit_header_parsed:1;
 794         unsigned commit_message_parsed:1;
 795         struct signature_check signature_check;
 796         enum flush_type flush_type;
 797         enum trunc_type truncate;
 798         const char *message;
 799         char *commit_encoding;
 800         size_t width, indent1, indent2;
 801         int auto_color;
 802         int padding;
 803
 804         /* These offsets are relative to the start of the commit message. */
 805         struct chunk author;
 806         struct chunk committer;
 807         size_t message_off;
 808         size_t subject_off;
 809         size_t body_off;
 810
 811         /* The following ones are relative to the result struct strbuf. */
 812         size_t wrap_start;
 813 };
 814
 815 static void parse_commit_header(struct format_commit_context *context)
 816 {
 817         const char *msg = context->message;
 818         int i;
 819
 820         for (i = 0; msg[i]; i++) {
 821                 const char *name;
 822                 int eol;
 823                 for (eol = i; msg[eol] && msg[eol] != '\n'; eol++)
 824                         ; /* do nothing */
 825
 826                 if (i == eol) {
 827                         break;
 828                 } else if (skip_prefix(msg + i, "author ", &name)) {
 829                         context->author.off = name - msg;
 830                         context->author.len = msg + eol - name;
 831                 } else if (skip_prefix(msg + i, "committer ", &name)) {
 832                         context->committer.off = name - msg;
 833                         context->committer.len = msg + eol - name;
 834                 }
 835                 i = eol;
 836         }
 837         context->message_off = i;
 838         context->commit_header_parsed = 1;
 839 }
 840
 841 static int istitlechar(char c)
 842 {
 843         return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') ||
 844                 (c >= '0' && c <= '9') || c == '.' || c == '_';
 845 }
 846
 847 void format_sanitized_subject(struct strbuf *sb, const char *msg, size_t len)
 848 {
 849         size_t trimlen;
 850         size_t start_len = sb->len;
 851         int space = 2;
 852         int i;
 853
 854         for (i = 0; i < len; i++) {
 855                 if (istitlechar(msg[i])) {
 856                         if (space == 1)
 857                                 strbuf_addch(sb, '-');
 858                         space = 0;
 859                         strbuf_addch(sb, msg[i]);
 860                         if (msg[i] == '.')
 861                                 while (msg[i+1] == '.')
 862                                         i++;
 863                 } else
 864                         space |= 1;
 865         }
 866
 867         /* trim any trailing '.' or '-' characters */
 868         trimlen = 0;
 869         while (sb->len - trimlen > start_len &&
 870                 (sb->buf[sb->len - 1 - trimlen] == '.'
 871                 || sb->buf[sb->len - 1 - trimlen] == '-'))
 872                 trimlen++;
 873         strbuf_remove(sb, sb->len - trimlen, trimlen);
 874 }
 875
 876 const char *format_subject(struct strbuf *sb, const char *msg,
 877                            const char *line_separator)
 878 {
 879         int first = 1;
 880
 881         for (;;) {
 882                 const char *line = msg;
 883                 int linelen = get_one_line(line);
 884
 885                 msg += linelen;
 886                 if (!linelen || is_blank_line(line, &linelen))
 887                         break;
 888
 889                 if (!sb)
 890                         continue;
 891                 strbuf_grow(sb, linelen + 2);
 892                 if (!first)
 893                         strbuf_addstr(sb, line_separator);
 894                 strbuf_add(sb, line, linelen);
 895                 first = 0;
 896         }
 897         return msg;
 898 }
 899
 900 static void parse_commit_message(struct format_commit_context *c)
 901 {
 902         const char *msg = c->message + c->message_off;
 903         const char *start = c->message;
 904
 905         msg = skip_blank_lines(msg);
 906         c->subject_off = msg - start;
 907
 908         msg = format_subject(NULL, msg, NULL);
 909         msg = skip_blank_lines(msg);
 910         c->body_off = msg - start;
 911
 912         c->commit_message_parsed = 1;
 913 }
 914
 915 static void strbuf_wrap(struct strbuf *sb, size_t pos,
 916                         size_t width, size_t indent1, size_t indent2)
 917 {
 918         struct strbuf tmp = STRBUF_INIT;
 919
 920         if (pos)
 921                 strbuf_add(&tmp, sb->buf, pos);
 922         strbuf_add_wrapped_text(&tmp, sb->buf + pos,
 923                                 (int) indent1, (int) indent2, (int) width);
 924         strbuf_swap(&tmp, sb);
 925         strbuf_release(&tmp);
 926 }
 927
 928 static void rewrap_message_tail(struct strbuf *sb,
 929                                 struct format_commit_context *c,
 930                                 size_t new_width, size_t new_indent1,
 931                                 size_t new_indent2)
 932 {
 933         if (c->width == new_width && c->indent1 == new_indent1 &&
 934             c->indent2 == new_indent2)
 935                 return;
 936         if (c->wrap_start < sb->len)
 937                 strbuf_wrap(sb, c->wrap_start, c->width, c->indent1, c->indent2);
 938         c->wrap_start = sb->len;
 939         c->width = new_width;
 940         c->indent1 = new_indent1;
 941         c->indent2 = new_indent2;
 942 }
 943
 944 static int format_reflog_person(struct strbuf *sb,
 945                                 char part,
 946                                 struct reflog_walk_info *log,
 947                                 const struct date_mode *dmode)
 948 {
 949         const char *ident;
 950
 951         if (!log)
 952                 return 2;
 953
 954         ident = get_reflog_ident(log);
 955         if (!ident)
 956                 return 2;
 957
 958         return format_person_part(sb, part, ident, strlen(ident), dmode);
 959 }
 960
 961 static size_t parse_color(struct strbuf *sb, /* in UTF-8 */
 962                           const char *placeholder,
 963                           struct format_commit_context *c)
 964 {
 965         const char *rest = placeholder;
 966         const char *basic_color = NULL;
 967
 968         if (placeholder[1] == '(') {
 969                 const char *begin = placeholder + 2;
 970                 const char *end = strchr(begin, ')');
 971                 char color[COLOR_MAXLEN];
 972
 973                 if (!end)
 974                         return 0;
 975
 976                 if (skip_prefix(begin, "auto,", &begin)) {
 977                         if (!want_color(c->pretty_ctx->color))
 978                                 return end - placeholder + 1;
 979                 } else if (skip_prefix(begin, "always,", &begin)) {
 980                         /* nothing to do; we do not respect want_color at all */
 981                 } else {
 982                         /* the default is the same as "auto" */
 983                         if (!want_color(c->pretty_ctx->color))
 984                                 return end - placeholder + 1;
 985                 }
 986
 987                 if (color_parse_mem(begin, end - begin, color) < 0)
 988                         die(_("unable to parse --pretty format"));
 989                 strbuf_addstr(sb, color);
 990                 return end - placeholder + 1;
 991         }
 992
 993         /*
 994          * We handle things like "%C(red)" above; for historical reasons, there
 995          * are a few colors that can be specified without parentheses (and
 996          * they cannot support things like "auto" or "always" at all).
 997          */
 998         if (skip_prefix(placeholder + 1, "red", &rest))
 999                 basic_color = GIT_COLOR_RED;
1000         else if (skip_prefix(placeholder + 1, "green", &rest))
1001                 basic_color = GIT_COLOR_GREEN;
1002         else if (skip_prefix(placeholder + 1, "blue", &rest))
1003                 basic_color = GIT_COLOR_BLUE;
1004         else if (skip_prefix(placeholder + 1, "reset", &rest))
1005                 basic_color = GIT_COLOR_RESET;
1006
1007         if (basic_color && want_color(c->pretty_ctx->color))
1008                 strbuf_addstr(sb, basic_color);
1009
1010         return rest - placeholder;
1011 }
1012
1013 static size_t parse_padding_placeholder(const char *placeholder,
1014                                         struct format_commit_context *c)
1015 {
1016         const char *ch = placeholder;
1017         enum flush_type flush_type;
1018         int to_column = 0;
1019
1020         switch (*ch++) {
1021         case '<':
1022                 flush_type = flush_right;
1023                 break;
1024         case '>':
1025                 if (*ch == '<') {
1026                         flush_type = flush_both;
1027                         ch++;
1028                 } else if (*ch == '>') {
1029                         flush_type = flush_left_and_steal;
1030                         ch++;
1031                 } else
1032                         flush_type = flush_left;
1033                 break;
1034         default:
1035                 return 0;
1036         }
1037
1038         /* the next value means "wide enough to that column" */
1039         if (*ch == '|') {
1040                 to_column = 1;
1041                 ch++;
1042         }
1043
1044         if (*ch == '(') {
1045                 const char *start = ch + 1;
1046                 const char *end = start + strcspn(start, ",)");
1047                 char *next;
1048                 int width;
1049                 if (!end || end == start)
1050                         return 0;
1051                 width = strtol(start, &next, 10);
1052                 if (next == start || width == 0)
1053                         return 0;
1054                 if (width < 0) {
1055                         if (to_column)
1056                                 width += term_columns();
1057                         if (width < 0)
1058                                 return 0;
1059                 }
1060                 c->padding = to_column ? -width : width;
1061                 c->flush_type = flush_type;
1062
1063                 if (*end == ',') {
1064                         start = end + 1;
1065                         end = strchr(start, ')');
1066                         if (!end || end == start)
1067                                 return 0;
1068                         if (starts_with(start, "trunc)"))
1069                                 c->truncate = trunc_right;
1070                         else if (starts_with(start, "ltrunc)"))
1071                                 c->truncate = trunc_left;
1072                         else if (starts_with(start, "mtrunc)"))
1073                                 c->truncate = trunc_middle;
1074                         else
1075                                 return 0;
1076                 } else
1077                         c->truncate = trunc_none;
1078
1079                 return end - placeholder + 1;
1080         }
1081         return 0;
1082 }
1083
1084 static int match_placeholder_arg_value(const char *to_parse, const char *candidate,
1085                                        const char **end, const char **valuestart,
1086                                        size_t *valuelen)
1087 {
1088         const char *p;
1089
1090         if (!(skip_prefix(to_parse, candidate, &p)))
1091                 return 0;
1092         if (valuestart) {
1093                 if (*p == '=') {
1094                         *valuestart = p + 1;
1095                         *valuelen = strcspn(*valuestart, ",)");
1096                         p = *valuestart + *valuelen;
1097                 } else {
1098                         if (*p != ',' && *p != ')')
1099                                 return 0;
1100                         *valuestart = NULL;
1101                         *valuelen = 0;
1102                 }
1103         }
1104         if (*p == ',') {
1105                 *end = p + 1;
1106                 return 1;
1107         }
1108         if (*p == ')') {
1109                 *end = p;
1110                 return 1;
1111         }
1112         return 0;
1113 }
1114
1115 static int match_placeholder_bool_arg(const char *to_parse, const char *candidate,
1116                                       const char **end, int *val)
1117 {
1118         const char *argval;
1119         char *strval;
1120         size_t arglen;
1121         int v;
1122
1123         if (!match_placeholder_arg_value(to_parse, candidate, end, &argval, &arglen))
1124                 return 0;
1125
1126         if (!argval) {
1127                 *val = 1;
1128                 return 1;
1129         }
1130
1131         strval = xstrndup(argval, arglen);
1132         v = git_parse_maybe_bool(strval);
1133         free(strval);
1134
1135         if (v == -1)
1136                 return 0;
1137
1138         *val = v;
1139
1140         return 1;
1141 }
1142
1143 static int format_trailer_match_cb(const struct strbuf *key, void *ud)
1144 {
1145         const struct string_list *list = ud;
1146         const struct string_list_item *item;
1147
1148         for_each_string_list_item (item, list) {
1149                 if (key->len == (uintptr_t)item->util &&
1150                     !strncasecmp(item->string, key->buf, key->len))
1151                         return 1;
1152         }
1153         return 0;
1154 }
1155
1156 int format_set_trailers_options(struct process_trailer_options *opts,
1157                                 struct string_list *filter_list,
1158                                 struct strbuf *sepbuf,
1159                                 struct strbuf *kvsepbuf,
1160                                 const char **arg,
1161                                 char **invalid_arg)
1162 {
1163         for (;;) {
1164                 const char *argval;
1165                 size_t arglen;
1166
1167                 if (**arg == ')')
1168                         break;
1169
1170                 if (match_placeholder_arg_value(*arg, "key", arg, &argval, &arglen)) {
1171                         uintptr_t len = arglen;
1172
1173                         if (!argval)
1174                                 return -1;
1175
1176                         if (len && argval[len - 1] == ':')
1177                                 len--;
1178                         string_list_append(filter_list, argval)->util = (char *)len;
1179
1180                         opts->filter = format_trailer_match_cb;
1181                         opts->filter_data = filter_list;
1182                         opts->only_trailers = 1;
1183                 } else if (match_placeholder_arg_value(*arg, "separator", arg, &argval, &arglen)) {
1184                         char *fmt;
1185
1186                         strbuf_reset(sepbuf);
1187                         fmt = xstrndup(argval, arglen);
1188                         strbuf_expand(sepbuf, fmt, strbuf_expand_literal_cb, NULL);
1189                         free(fmt);
1190                         opts->separator = sepbuf;
1191                 } else if (match_placeholder_arg_value(*arg, "key_value_separator", arg, &argval, &arglen)) {
1192                         char *fmt;
1193
1194                         strbuf_reset(kvsepbuf);
1195                         fmt = xstrndup(argval, arglen);
1196                         strbuf_expand(kvsepbuf, fmt, strbuf_expand_literal_cb, NULL);
1197                         free(fmt);
1198                         opts->key_value_separator = kvsepbuf;
1199                 } else if (!match_placeholder_bool_arg(*arg, "only", arg, &opts->only_trailers) &&
1200                            !match_placeholder_bool_arg(*arg, "unfold", arg, &opts->unfold) &&
1201                            !match_placeholder_bool_arg(*arg, "keyonly", arg, &opts->key_only) &&
1202                            !match_placeholder_bool_arg(*arg, "valueonly", arg, &opts->value_only)) {
1203                         if (invalid_arg) {
1204                                 size_t len = strcspn(*arg, ",)");
1205                                 *invalid_arg = xstrndup(*arg, len);
1206                         }
1207                         return -1;
1208                 }
1209         }
1210         return 0;
1211 }
1212
1213 static size_t parse_describe_args(const char *start, struct strvec *args)
1214 {
1215         const char *options[] = { "match", "exclude" };
1216         const char *arg = start;
1217
1218         for (;;) {
1219                 const char *matched = NULL;
1220                 const char *argval;
1221                 size_t arglen = 0;
1222                 int i;
1223
1224                 for (i = 0; i < ARRAY_SIZE(options); i++) {
1225                         if (match_placeholder_arg_value(arg, options[i], &arg,
1226                                                         &argval, &arglen)) {
1227                                 matched = options[i];
1228                                 break;
1229                         }
1230                 }
1231                 if (!matched)
1232                         break;
1233
1234                 if (!arglen)
1235                         return 0;
1236                 strvec_pushf(args, "--%s=%.*s", matched, (int)arglen, argval);
1237         }
1238         return arg - start;
1239 }
1240
1241 static size_t format_commit_one(struct strbuf *sb, /* in UTF-8 */
1242                                 const char *placeholder,
1243                                 void *context)
1244 {
1245         struct format_commit_context *c = context;
1246         const struct commit *commit = c->commit;
1247         const char *msg = c->message;
1248         struct commit_list *p;
1249         const char *arg, *eol;
1250         size_t res;
1251         char **slot;
1252
1253         /* these are independent of the commit */
1254         res = strbuf_expand_literal_cb(sb, placeholder, NULL);
1255         if (res)
1256                 return res;
1257
1258         switch (placeholder[0]) {
1259         case 'C':
1260                 if (starts_with(placeholder + 1, "(auto)")) {
1261                         c->auto_color = want_color(c->pretty_ctx->color);
1262                         if (c->auto_color && sb->len)
1263                                 strbuf_addstr(sb, GIT_COLOR_RESET);
1264                         return 7; /* consumed 7 bytes, "C(auto)" */
1265                 } else {
1266                         int ret = parse_color(sb, placeholder, c);
1267                         if (ret)
1268                                 c->auto_color = 0;
1269                         /*
1270                          * Otherwise, we decided to treat %C<unknown>
1271                          * as a literal string, and the previous
1272                          * %C(auto) is still valid.
1273                          */
1274                         return ret;
1275                 }
1276         case 'w':
1277                 if (placeholder[1] == '(') {
1278                         unsigned long width = 0, indent1 = 0, indent2 = 0;
1279                         char *next;
1280                         const char *start = placeholder + 2;
1281                         const char *end = strchr(start, ')');
1282                         if (!end)
1283                                 return 0;
1284                         if (end > start) {
1285                                 width = strtoul(start, &next, 10);
1286                                 if (*next == ',') {
1287                                         indent1 = strtoul(next + 1, &next, 10);
1288                                         if (*next == ',') {
1289                                                 indent2 = strtoul(next + 1,
1290                                                                  &next, 10);
1291                                         }
1292                                 }
1293                                 if (*next != ')')
1294                                         return 0;
1295                         }
1296                         rewrap_message_tail(sb, c, width, indent1, indent2);
1297                         return end - placeholder + 1;
1298                 } else
1299                         return 0;
1300
1301         case '<':
1302         case '>':
1303                 return parse_padding_placeholder(placeholder, c);
1304         }
1305
1306         if (skip_prefix(placeholder, "(describe", &arg)) {
1307                 struct child_process cmd = CHILD_PROCESS_INIT;
1308                 struct strbuf out = STRBUF_INIT;
1309                 struct strbuf err = STRBUF_INIT;
1310                 struct pretty_print_describe_status *describe_status;
1311
1312                 describe_status = c->pretty_ctx->describe_status;
1313                 if (describe_status) {
1314                         if (!describe_status->max_invocations)
1315                                 return 0;
1316                         describe_status->max_invocations--;
1317                 }
1318
1319                 cmd.git_cmd = 1;
1320                 strvec_push(&cmd.args, "describe");
1321
1322                 if (*arg == ':') {
1323                         arg++;
1324                         arg += parse_describe_args(arg, &cmd.args);
1325                 }
1326
1327                 if (*arg != ')') {
1328                         child_process_clear(&cmd);
1329                         return 0;
1330                 }
1331
1332                 strvec_push(&cmd.args, oid_to_hex(&commit->object.oid));
1333                 pipe_command(&cmd, NULL, 0, &out, 0, &err, 0);
1334                 strbuf_rtrim(&out);
1335                 strbuf_addbuf(sb, &out);
1336                 strbuf_release(&out);
1337                 strbuf_release(&err);
1338                 return arg - placeholder + 1;
1339         }
1340
1341         /* these depend on the commit */
1342         if (!commit->object.parsed)
1343                 parse_object(the_repository, &commit->object.oid);
1344
1345         switch (placeholder[0]) {
1346         case 'H':               /* commit hash */
1347                 strbuf_addstr(sb, diff_get_color(c->auto_color, DIFF_COMMIT));
1348                 strbuf_addstr(sb, oid_to_hex(&commit->object.oid));
1349                 strbuf_addstr(sb, diff_get_color(c->auto_color, DIFF_RESET));
1350                 return 1;
1351         case 'h':               /* abbreviated commit hash */
1352                 strbuf_addstr(sb, diff_get_color(c->auto_color, DIFF_COMMIT));
1353                 strbuf_add_unique_abbrev(sb, &commit->object.oid,
1354                                          c->pretty_ctx->abbrev);
1355                 strbuf_addstr(sb, diff_get_color(c->auto_color, DIFF_RESET));
1356                 return 1;
1357         case 'T':               /* tree hash */
1358                 strbuf_addstr(sb, oid_to_hex(get_commit_tree_oid(commit)));
1359                 return 1;
1360         case 't':               /* abbreviated tree hash */
1361                 strbuf_add_unique_abbrev(sb,
1362                                          get_commit_tree_oid(commit),
1363                                          c->pretty_ctx->abbrev);
1364                 return 1;
1365         case 'P':               /* parent hashes */
1366                 for (p = commit->parents; p; p = p->next) {
1367                         if (p != commit->parents)
1368                                 strbuf_addch(sb, ' ');
1369                         strbuf_addstr(sb, oid_to_hex(&p->item->object.oid));
1370                 }
1371                 return 1;
1372         case 'p':               /* abbreviated parent hashes */
1373                 for (p = commit->parents; p; p = p->next) {
1374                         if (p != commit->parents)
1375                                 strbuf_addch(sb, ' ');
1376                         strbuf_add_unique_abbrev(sb, &p->item->object.oid,
1377                                                  c->pretty_ctx->abbrev);
1378                 }
1379                 return 1;
1380         case 'm':               /* left/right/bottom */
1381                 strbuf_addstr(sb, get_revision_mark(NULL, commit));
1382                 return 1;
1383         case 'd':
1384                 format_decorations(sb, commit, c->auto_color);
1385                 return 1;
1386         case 'D':
1387                 format_decorations_extended(sb, commit, c->auto_color, "", ", ", "");
1388                 return 1;
1389         case 'S':               /* tag/branch like --source */
1390                 if (!(c->pretty_ctx->rev && c->pretty_ctx->rev->sources))
1391                         return 0;
1392                 slot = revision_sources_at(c->pretty_ctx->rev->sources, commit);
1393                 if (!(slot && *slot))
1394                         return 0;
1395                 strbuf_addstr(sb, *slot);
1396                 return 1;
1397         case 'g':               /* reflog info */
1398                 switch(placeholder[1]) {
1399                 case 'd':       /* reflog selector */
1400                 case 'D':
1401                         if (c->pretty_ctx->reflog_info)
1402                                 get_reflog_selector(sb,
1403                                                     c->pretty_ctx->reflog_info,
1404                                                     &c->pretty_ctx->date_mode,
1405                                                     c->pretty_ctx->date_mode_explicit,
1406                                                     (placeholder[1] == 'd'));
1407                         return 2;
1408                 case 's':       /* reflog message */
1409                         if (c->pretty_ctx->reflog_info)
1410                                 get_reflog_message(sb, c->pretty_ctx->reflog_info);
1411                         return 2;
1412                 case 'n':
1413                 case 'N':
1414                 case 'e':
1415                 case 'E':
1416                         return format_reflog_person(sb,
1417                                                     placeholder[1],
1418                                                     c->pretty_ctx->reflog_info,
1419                                                     &c->pretty_ctx->date_mode);
1420                 }
1421                 return 0;       /* unknown %g placeholder */
1422         case 'N':
1423                 if (c->pretty_ctx->notes_message) {
1424                         strbuf_addstr(sb, c->pretty_ctx->notes_message);
1425                         return 1;
1426                 }
1427                 return 0;
1428         }
1429
1430         if (placeholder[0] == 'G') {
1431                 if (!c->signature_check.result)
1432                         check_commit_signature(c->commit, &(c->signature_check));
1433                 switch (placeholder[1]) {
1434                 case 'G':
1435                         if (c->signature_check.gpg_output)
1436                                 strbuf_addstr(sb, c->signature_check.gpg_output);
1437                         break;
1438                 case '?':
1439                         switch (c->signature_check.result) {
1440                         case 'G':
1441                                 switch (c->signature_check.trust_level) {
1442                                 case TRUST_UNDEFINED:
1443                                 case TRUST_NEVER:
1444                                         strbuf_addch(sb, 'U');
1445                                         break;
1446                                 default:
1447                                         strbuf_addch(sb, 'G');
1448                                         break;
1449                                 }
1450                                 break;
1451                         case 'B':
1452                         case 'E':
1453                         case 'N':
1454                         case 'X':
1455                         case 'Y':
1456                         case 'R':
1457                                 strbuf_addch(sb, c->signature_check.result);
1458                         }
1459                         break;
1460                 case 'S':
1461                         if (c->signature_check.signer)
1462                                 strbuf_addstr(sb, c->signature_check.signer);
1463                         break;
1464                 case 'K':
1465                         if (c->signature_check.key)
1466                                 strbuf_addstr(sb, c->signature_check.key);
1467                         break;
1468                 case 'F':
1469                         if (c->signature_check.fingerprint)
1470                                 strbuf_addstr(sb, c->signature_check.fingerprint);
1471                         break;
1472                 case 'P':
1473                         if (c->signature_check.primary_key_fingerprint)
1474                                 strbuf_addstr(sb, c->signature_check.primary_key_fingerprint);
1475                         break;
1476                 case 'T':
1477                         switch (c->signature_check.trust_level) {
1478                         case TRUST_UNDEFINED:
1479                                 strbuf_addstr(sb, "undefined");
1480                                 break;
1481                         case TRUST_NEVER:
1482                                 strbuf_addstr(sb, "never");
1483                                 break;
1484                         case TRUST_MARGINAL:
1485                                 strbuf_addstr(sb, "marginal");
1486                                 break;
1487                         case TRUST_FULLY:
1488                                 strbuf_addstr(sb, "fully");
1489                                 break;
1490                         case TRUST_ULTIMATE:
1491                                 strbuf_addstr(sb, "ultimate");
1492                                 break;
1493                         }
1494                         break;
1495                 default:
1496                         return 0;
1497                 }
1498                 return 2;
1499         }
1500
1501         /* For the rest we have to parse the commit header. */
1502         if (!c->commit_header_parsed) {
1503                 msg = c->message =
1504                         repo_logmsg_reencode(c->repository, commit,
1505                                              &c->commit_encoding, "UTF-8");
1506                 parse_commit_header(c);
1507         }
1508
1509         switch (placeholder[0]) {
1510         case 'a':       /* author ... */
1511                 return format_person_part(sb, placeholder[1],
1512                                    msg + c->author.off, c->author.len,
1513                                    &c->pretty_ctx->date_mode);
1514         case 'c':       /* committer ... */
1515                 return format_person_part(sb, placeholder[1],
1516                                    msg + c->committer.off, c->committer.len,
1517                                    &c->pretty_ctx->date_mode);
1518         case 'e':       /* encoding */
1519                 if (c->commit_encoding)
1520                         strbuf_addstr(sb, c->commit_encoding);
1521                 return 1;
1522         case 'B':       /* raw body */
1523                 /* message_off is always left at the initial newline */
1524                 strbuf_addstr(sb, msg + c->message_off + 1);
1525                 return 1;
1526         }
1527
1528         /* Now we need to parse the commit message. */
1529         if (!c->commit_message_parsed)
1530                 parse_commit_message(c);
1531
1532         switch (placeholder[0]) {
1533         case 's':       /* subject */
1534                 format_subject(sb, msg + c->subject_off, " ");
1535                 return 1;
1536         case 'f':       /* sanitized subject */
1537                 eol = strchrnul(msg + c->subject_off, '\n');
1538                 format_sanitized_subject(sb, msg + c->subject_off, eol - (msg + c->subject_off));
1539                 return 1;
1540         case 'b':       /* body */
1541                 strbuf_addstr(sb, msg + c->body_off);
1542                 return 1;
1543         }
1544
1545         if (skip_prefix(placeholder, "(trailers", &arg)) {
1546                 struct process_trailer_options opts = PROCESS_TRAILER_OPTIONS_INIT;
1547                 struct string_list filter_list = STRING_LIST_INIT_NODUP;
1548                 struct strbuf sepbuf = STRBUF_INIT;
1549                 struct strbuf kvsepbuf = STRBUF_INIT;
1550                 size_t ret = 0;
1551
1552                 opts.no_divider = 1;
1553
1554                 if (*arg == ':') {
1555                         arg++;
1556                         if (format_set_trailers_options(&opts, &filter_list, &sepbuf, &kvsepbuf, &arg, NULL))
1557                                 goto trailer_out;
1558                 }
1559                 if (*arg == ')') {
1560                         format_trailers_from_commit(sb, msg + c->subject_off, &opts);
1561                         ret = arg - placeholder + 1;
1562                 }
1563         trailer_out:
1564                 string_list_clear(&filter_list, 0);
1565                 strbuf_release(&sepbuf);
1566                 return ret;
1567         }
1568
1569         return 0;       /* unknown placeholder */
1570 }
1571
1572 static size_t format_and_pad_commit(struct strbuf *sb, /* in UTF-8 */
1573                                     const char *placeholder,
1574                                     struct format_commit_context *c)
1575 {
1576         struct strbuf local_sb = STRBUF_INIT;
1577         int total_consumed = 0, len, padding = c->padding;
1578         if (padding < 0) {
1579                 const char *start = strrchr(sb->buf, '\n');
1580                 int occupied;
1581                 if (!start)
1582                         start = sb->buf;
1583                 occupied = utf8_strnwidth(start, -1, 1);
1584                 occupied += c->pretty_ctx->graph_width;
1585                 padding = (-padding) - occupied;
1586         }
1587         while (1) {
1588                 int modifier = *placeholder == 'C';
1589                 int consumed = format_commit_one(&local_sb, placeholder, c);
1590                 total_consumed += consumed;
1591
1592                 if (!modifier)
1593                         break;
1594
1595                 placeholder += consumed;
1596                 if (*placeholder != '%')
1597                         break;
1598                 placeholder++;
1599                 total_consumed++;
1600         }
1601         len = utf8_strnwidth(local_sb.buf, -1, 1);
1602
1603         if (c->flush_type == flush_left_and_steal) {
1604                 const char *ch = sb->buf + sb->len - 1;
1605                 while (len > padding && ch > sb->buf) {
1606                         const char *p;
1607                         if (*ch == ' ') {
1608                                 ch--;
1609                                 padding++;
1610                                 continue;
1611                         }
1612                         /* check for trailing ansi sequences */
1613                         if (*ch != 'm')
1614                                 break;
1615                         p = ch - 1;
1616                         while (ch - p < 10 && *p != '\033')
1617                                 p--;
1618                         if (*p != '\033' ||
1619                             ch + 1 - p != display_mode_esc_sequence_len(p))
1620                                 break;
1621                         /*
1622                          * got a good ansi sequence, put it back to
1623                          * local_sb as we're cutting sb
1624                          */
1625                         strbuf_insert(&local_sb, 0, p, ch + 1 - p);
1626                         ch = p - 1;
1627                 }
1628                 strbuf_setlen(sb, ch + 1 - sb->buf);
1629                 c->flush_type = flush_left;
1630         }
1631
1632         if (len > padding) {
1633                 switch (c->truncate) {
1634                 case trunc_left:
1635                         strbuf_utf8_replace(&local_sb,
1636                                             0, len - (padding - 2),
1637                                             "..");
1638                         break;
1639                 case trunc_middle:
1640                         strbuf_utf8_replace(&local_sb,
1641                                             padding / 2 - 1,
1642                                             len - (padding - 2),
1643                                             "..");
1644                         break;
1645                 case trunc_right:
1646                         strbuf_utf8_replace(&local_sb,
1647                                             padding - 2, len - (padding - 2),
1648                                             "..");
1649                         break;
1650                 case trunc_none:
1651                         break;
1652                 }
1653                 strbuf_addbuf(sb, &local_sb);
1654         } else {
1655                 int sb_len = sb->len, offset = 0;
1656                 if (c->flush_type == flush_left)
1657                         offset = padding - len;
1658                 else if (c->flush_type == flush_both)
1659                         offset = (padding - len) / 2;
1660                 /*
1661                  * we calculate padding in columns, now
1662                  * convert it back to chars
1663                  */
1664                 padding = padding - len + local_sb.len;
1665                 strbuf_addchars(sb, ' ', padding);
1666                 memcpy(sb->buf + sb_len + offset, local_sb.buf,
1667                        local_sb.len);
1668         }
1669         strbuf_release(&local_sb);
1670         c->flush_type = no_flush;
1671         return total_consumed;
1672 }
1673
1674 static size_t format_commit_item(struct strbuf *sb, /* in UTF-8 */
1675                                  const char *placeholder,
1676                                  void *context)
1677 {
1678         int consumed;
1679         size_t orig_len;
1680         enum {
1681                 NO_MAGIC,
1682                 ADD_LF_BEFORE_NON_EMPTY,
1683                 DEL_LF_BEFORE_EMPTY,
1684                 ADD_SP_BEFORE_NON_EMPTY
1685         } magic = NO_MAGIC;
1686
1687         switch (placeholder[0]) {
1688         case '-':
1689                 magic = DEL_LF_BEFORE_EMPTY;
1690                 break;
1691         case '+':
1692                 magic = ADD_LF_BEFORE_NON_EMPTY;
1693                 break;
1694         case ' ':
1695                 magic = ADD_SP_BEFORE_NON_EMPTY;
1696                 break;
1697         default:
1698                 break;
1699         }
1700         if (magic != NO_MAGIC)
1701                 placeholder++;
1702
1703         orig_len = sb->len;
1704         if (((struct format_commit_context *)context)->flush_type != no_flush)
1705                 consumed = format_and_pad_commit(sb, placeholder, context);
1706         else
1707                 consumed = format_commit_one(sb, placeholder, context);
1708         if (magic == NO_MAGIC)
1709                 return consumed;
1710
1711         if ((orig_len == sb->len) && magic == DEL_LF_BEFORE_EMPTY) {
1712                 while (sb->len && sb->buf[sb->len - 1] == '\n')
1713                         strbuf_setlen(sb, sb->len - 1);
1714         } else if (orig_len != sb->len) {
1715                 if (magic == ADD_LF_BEFORE_NON_EMPTY)
1716                         strbuf_insertstr(sb, orig_len, "\n");
1717                 else if (magic == ADD_SP_BEFORE_NON_EMPTY)
1718                         strbuf_insertstr(sb, orig_len, " ");
1719         }
1720         return consumed + 1;
1721 }
1722
1723 static size_t userformat_want_item(struct strbuf *sb, const char *placeholder,
1724                                    void *context)
1725 {
1726         struct userformat_want *w = context;
1727
1728         if (*placeholder == '+' || *placeholder == '-' || *placeholder == ' ')
1729                 placeholder++;
1730
1731         switch (*placeholder) {
1732         case 'N':
1733                 w->notes = 1;
1734                 break;
1735         case 'S':
1736                 w->source = 1;
1737                 break;
1738         }
1739         return 0;
1740 }
1741
1742 void userformat_find_requirements(const char *fmt, struct userformat_want *w)
1743 {
1744         struct strbuf dummy = STRBUF_INIT;
1745
1746         if (!fmt) {
1747                 if (!user_format)
1748                         return;
1749                 fmt = user_format;
1750         }
1751         strbuf_expand(&dummy, fmt, userformat_want_item, w);
1752         strbuf_release(&dummy);
1753 }
1754
1755 void repo_format_commit_message(struct repository *r,
1756                                 const struct commit *commit,
1757                                 const char *format, struct strbuf *sb,
1758                                 const struct pretty_print_context *pretty_ctx)
1759 {
1760         struct format_commit_context context = {
1761                 .repository = r,
1762                 .commit = commit,
1763                 .pretty_ctx = pretty_ctx,
1764                 .wrap_start = sb->len
1765         };
1766         const char *output_enc = pretty_ctx->output_encoding;
1767         const char *utf8 = "UTF-8";
1768
1769         strbuf_expand(sb, format, format_commit_item, &context);
1770         rewrap_message_tail(sb, &context, 0, 0, 0);
1771
1772         /*
1773          * Convert output to an actual output encoding; note that
1774          * format_commit_item() will always use UTF-8, so we don't
1775          * have to bother if that's what the output wants.
1776          */
1777         if (output_enc) {
1778                 if (same_encoding(utf8, output_enc))
1779                         output_enc = NULL;
1780         } else {
1781                 if (context.commit_encoding &&
1782                     !same_encoding(context.commit_encoding, utf8))
1783                         output_enc = context.commit_encoding;
1784         }
1785
1786         if (output_enc) {
1787                 size_t outsz;
1788                 char *out = reencode_string_len(sb->buf, sb->len,
1789                                                 output_enc, utf8, &outsz);
1790                 if (out)
1791                         strbuf_attach(sb, out, outsz, outsz + 1);
1792         }
1793
1794         free(context.commit_encoding);
1795         repo_unuse_commit_buffer(r, commit, context.message);
1796 }
1797
1798 static void pp_header(struct pretty_print_context *pp,
1799                       const char *encoding,
1800                       const struct commit *commit,
1801                       const char **msg_p,
1802                       struct strbuf *sb)
1803 {
1804         int parents_shown = 0;
1805
1806         for (;;) {
1807                 const char *name, *line = *msg_p;
1808                 int linelen = get_one_line(*msg_p);
1809
1810                 if (!linelen)
1811                         return;
1812                 *msg_p += linelen;
1813
1814                 if (linelen == 1)
1815                         /* End of header */
1816                         return;
1817
1818                 if (pp->fmt == CMIT_FMT_RAW) {
1819                         strbuf_add(sb, line, linelen);
1820                         continue;
1821                 }
1822
1823                 if (starts_with(line, "parent ")) {
1824                         if (linelen != the_hash_algo->hexsz + 8)
1825                                 die("bad parent line in commit");
1826                         continue;
1827                 }
1828
1829                 if (!parents_shown) {
1830                         unsigned num = commit_list_count(commit->parents);
1831                         /* with enough slop */
1832                         strbuf_grow(sb, num * (GIT_MAX_HEXSZ + 10) + 20);
1833                         add_merge_info(pp, sb, commit);
1834                         parents_shown = 1;
1835                 }
1836
1837                 /*
1838                  * MEDIUM == DEFAULT shows only author with dates.
1839                  * FULL shows both authors but not dates.
1840                  * FULLER shows both authors and dates.
1841                  */
1842                 if (skip_prefix(line, "author ", &name)) {
1843                         strbuf_grow(sb, linelen + 80);
1844                         pp_user_info(pp, "Author", sb, name, encoding);
1845                 }
1846                 if (skip_prefix(line, "committer ", &name) &&
1847                     (pp->fmt == CMIT_FMT_FULL || pp->fmt == CMIT_FMT_FULLER)) {
1848                         strbuf_grow(sb, linelen + 80);
1849                         pp_user_info(pp, "Commit", sb, name, encoding);
1850                 }
1851         }
1852 }
1853
1854 void pp_title_line(struct pretty_print_context *pp,
1855                    const char **msg_p,
1856                    struct strbuf *sb,
1857                    const char *encoding,
1858                    int need_8bit_cte)
1859 {
1860         static const int max_length = 78; /* per rfc2047 */
1861         struct strbuf title;
1862
1863         strbuf_init(&title, 80);
1864         *msg_p = format_subject(&title, *msg_p,
1865                                 pp->preserve_subject ? "\n" : " ");
1866
1867         strbuf_grow(sb, title.len + 1024);
1868         if (pp->print_email_subject) {
1869                 if (pp->rev)
1870                         fmt_output_email_subject(sb, pp->rev);
1871                 if (pp->encode_email_headers &&
1872                     needs_rfc2047_encoding(title.buf, title.len))
1873                         add_rfc2047(sb, title.buf, title.len,
1874                                                 encoding, RFC2047_SUBJECT);
1875                 else
1876                         strbuf_add_wrapped_bytes(sb, title.buf, title.len,
1877                                          -last_line_length(sb), 1, max_length);
1878         } else {
1879                 strbuf_addbuf(sb, &title);
1880         }
1881         strbuf_addch(sb, '\n');
1882
1883         if (need_8bit_cte == 0) {
1884                 int i;
1885                 for (i = 0; i < pp->in_body_headers.nr; i++) {
1886                         if (has_non_ascii(pp->in_body_headers.items[i].string)) {
1887                                 need_8bit_cte = 1;
1888                                 break;
1889                         }
1890                 }
1891         }
1892
1893         if (need_8bit_cte > 0) {
1894                 const char *header_fmt =
1895                         "MIME-Version: 1.0\n"
1896                         "Content-Type: text/plain; charset=%s\n"
1897                         "Content-Transfer-Encoding: 8bit\n";
1898                 strbuf_addf(sb, header_fmt, encoding);
1899         }
1900         if (pp->after_subject) {
1901                 strbuf_addstr(sb, pp->after_subject);
1902         }
1903         if (cmit_fmt_is_mail(pp->fmt)) {
1904                 strbuf_addch(sb, '\n');
1905         }
1906
1907         if (pp->in_body_headers.nr) {
1908                 int i;
1909                 for (i = 0; i < pp->in_body_headers.nr; i++) {
1910                         strbuf_addstr(sb, pp->in_body_headers.items[i].string);
1911                         free(pp->in_body_headers.items[i].string);
1912                 }
1913                 string_list_clear(&pp->in_body_headers, 0);
1914                 strbuf_addch(sb, '\n');
1915         }
1916
1917         strbuf_release(&title);
1918 }
1919
1920 static int pp_utf8_width(const char *start, const char *end)
1921 {
1922         int width = 0;
1923         size_t remain = end - start;
1924
1925         while (remain) {
1926                 int n = utf8_width(&start, &remain);
1927                 if (n < 0 || !start)
1928                         return -1;
1929                 width += n;
1930         }
1931         return width;
1932 }
1933
1934 static void strbuf_add_tabexpand(struct strbuf *sb, int tabwidth,
1935                                  const char *line, int linelen)
1936 {
1937         const char *tab;
1938
1939         while ((tab = memchr(line, '\t', linelen)) != NULL) {
1940                 int width = pp_utf8_width(line, tab);
1941
1942                 /*
1943                  * If it wasn't well-formed utf8, or it
1944                  * had characters with badly defined
1945                  * width (control characters etc), just
1946                  * give up on trying to align things.
1947                  */
1948                 if (width < 0)
1949                         break;
1950
1951                 /* Output the data .. */
1952                 strbuf_add(sb, line, tab - line);
1953
1954                 /* .. and the de-tabified tab */
1955                 strbuf_addchars(sb, ' ', tabwidth - (width % tabwidth));
1956
1957                 /* Skip over the printed part .. */
1958                 linelen -= tab + 1 - line;
1959                 line = tab + 1;
1960         }
1961
1962         /*
1963          * Print out everything after the last tab without
1964          * worrying about width - there's nothing more to
1965          * align.
1966          */
1967         strbuf_add(sb, line, linelen);
1968 }
1969
1970 /*
1971  * pp_handle_indent() prints out the intendation, and
1972  * the whole line (without the final newline), after
1973  * de-tabifying.
1974  */
1975 static void pp_handle_indent(struct pretty_print_context *pp,
1976                              struct strbuf *sb, int indent,
1977                              const char *line, int linelen)
1978 {
1979         strbuf_addchars(sb, ' ', indent);
1980         if (pp->expand_tabs_in_log)
1981                 strbuf_add_tabexpand(sb, pp->expand_tabs_in_log, line, linelen);
1982         else
1983                 strbuf_add(sb, line, linelen);
1984 }
1985
1986 static int is_mboxrd_from(const char *line, int len)
1987 {
1988         /*
1989          * a line matching /^From $/ here would only have len == 4
1990          * at this point because is_empty_line would've trimmed all
1991          * trailing space
1992          */
1993         return len > 4 && starts_with(line + strspn(line, ">"), "From ");
1994 }
1995
1996 void pp_remainder(struct pretty_print_context *pp,
1997                   const char **msg_p,
1998                   struct strbuf *sb,
1999                   int indent)
2000 {
2001         int first = 1;
2002         for (;;) {
2003                 const char *line = *msg_p;
2004                 int linelen = get_one_line(line);
2005                 *msg_p += linelen;
2006
2007                 if (!linelen)
2008                         break;
2009
2010                 if (is_blank_line(line, &linelen)) {
2011                         if (first)
2012                                 continue;
2013                         if (pp->fmt == CMIT_FMT_SHORT)
2014                                 break;
2015                 }
2016                 first = 0;
2017
2018                 strbuf_grow(sb, linelen + indent + 20);
2019                 if (indent)
2020                         pp_handle_indent(pp, sb, indent, line, linelen);
2021                 else if (pp->expand_tabs_in_log)
2022                         strbuf_add_tabexpand(sb, pp->expand_tabs_in_log,
2023                                              line, linelen);
2024                 else {
2025                         if (pp->fmt == CMIT_FMT_MBOXRD &&
2026                                         is_mboxrd_from(line, linelen))
2027                                 strbuf_addch(sb, '>');
2028
2029                         strbuf_add(sb, line, linelen);
2030                 }
2031                 strbuf_addch(sb, '\n');
2032         }
2033 }
2034
2035 void pretty_print_commit(struct pretty_print_context *pp,
2036                          const struct commit *commit,
2037                          struct strbuf *sb)
2038 {
2039         unsigned long beginning_of_body;
2040         int indent = 4;
2041         const char *msg;
2042         const char *reencoded;
2043         const char *encoding;
2044         int need_8bit_cte = pp->need_8bit_cte;
2045
2046         if (pp->fmt == CMIT_FMT_USERFORMAT) {
2047                 format_commit_message(commit, user_format, sb, pp);
2048                 return;
2049         }
2050
2051         encoding = get_log_output_encoding();
2052         msg = reencoded = logmsg_reencode(commit, NULL, encoding);
2053
2054         if (pp->fmt == CMIT_FMT_ONELINE || cmit_fmt_is_mail(pp->fmt))
2055                 indent = 0;
2056
2057         /*
2058          * We need to check and emit Content-type: to mark it
2059          * as 8-bit if we haven't done so.
2060          */
2061         if (cmit_fmt_is_mail(pp->fmt) && need_8bit_cte == 0) {
2062                 int i, ch, in_body;
2063
2064                 for (in_body = i = 0; (ch = msg[i]); i++) {
2065                         if (!in_body) {
2066                                 /* author could be non 7-bit ASCII but
2067                                  * the log may be so; skip over the
2068                                  * header part first.
2069                                  */
2070                                 if (ch == '\n' && msg[i+1] == '\n')
2071                                         in_body = 1;
2072                         }
2073                         else if (non_ascii(ch)) {
2074                                 need_8bit_cte = 1;
2075                                 break;
2076                         }
2077                 }
2078         }
2079
2080         pp_header(pp, encoding, commit, &msg, sb);
2081         if (pp->fmt != CMIT_FMT_ONELINE && !pp->print_email_subject) {
2082                 strbuf_addch(sb, '\n');
2083         }
2084
2085         /* Skip excess blank lines at the beginning of body, if any... */
2086         msg = skip_blank_lines(msg);
2087
2088         /* These formats treat the title line specially. */
2089         if (pp->fmt == CMIT_FMT_ONELINE || cmit_fmt_is_mail(pp->fmt))
2090                 pp_title_line(pp, &msg, sb, encoding, need_8bit_cte);
2091
2092         beginning_of_body = sb->len;
2093         if (pp->fmt != CMIT_FMT_ONELINE)
2094                 pp_remainder(pp, &msg, sb, indent);
2095         strbuf_rtrim(sb);
2096
2097         /* Make sure there is an EOLN for the non-oneline case */
2098         if (pp->fmt != CMIT_FMT_ONELINE)
2099                 strbuf_addch(sb, '\n');
2100
2101         /*
2102          * The caller may append additional body text in e-mail
2103          * format.  Make sure we did not strip the blank line
2104          * between the header and the body.
2105          */
2106         if (cmit_fmt_is_mail(pp->fmt) && sb->len <= beginning_of_body)
2107                 strbuf_addch(sb, '\n');
2108
2109         unuse_commit_buffer(commit, reencoded);
2110 }
2111
2112 void pp_commit_easy(enum cmit_fmt fmt, const struct commit *commit,
2113                     struct strbuf *sb)
2114 {
2115         struct pretty_print_context pp = {0};
2116         pp.fmt = fmt;
2117         pretty_print_commit(&pp, commit, sb);
2118 }