Andrew's git / gitweb.git / pretty.c
?
pretty.con commit fetch: Speed up fetch of large numbers of refs (b1a01e1)
   1#include "cache.h"
   2#include "commit.h"
   3#include "utf8.h"
   4#include "diff.h"
   5#include "revision.h"
   6#include "string-list.h"
   7#include "mailmap.h"
   8#include "log-tree.h"
   9#include "color.h"
  10
  11static char *user_format;
  12
  13static void save_user_format(struct rev_info *rev, const char *cp, int is_tformat)
  14{
  15        free(user_format);
  16        user_format = xstrdup(cp);
  17        if (is_tformat)
  18                rev->use_terminator = 1;
  19        rev->commit_format = CMIT_FMT_USERFORMAT;
  20}
  21
  22void get_commit_format(const char *arg, struct rev_info *rev)
  23{
  24        int i;
  25        static struct cmt_fmt_map {
  26                const char *n;
  27                size_t cmp_len;
  28                enum cmit_fmt v;
  29        } cmt_fmts[] = {
  30                { "raw",        1,      CMIT_FMT_RAW },
  31                { "medium",     1,      CMIT_FMT_MEDIUM },
  32                { "short",      1,      CMIT_FMT_SHORT },
  33                { "email",      1,      CMIT_FMT_EMAIL },
  34                { "full",       5,      CMIT_FMT_FULL },
  35                { "fuller",     5,      CMIT_FMT_FULLER },
  36                { "oneline",    1,      CMIT_FMT_ONELINE },
  37        };
  38
  39        rev->use_terminator = 0;
  40        if (!arg || !*arg) {
  41                rev->commit_format = CMIT_FMT_DEFAULT;
  42                return;
  43        }
  44        if (!prefixcmp(arg, "format:") || !prefixcmp(arg, "tformat:")) {
  45                save_user_format(rev, strchr(arg, ':') + 1, arg[0] == 't');
  46                return;
  47        }
  48        for (i = 0; i < ARRAY_SIZE(cmt_fmts); i++) {
  49                if (!strncmp(arg, cmt_fmts[i].n, cmt_fmts[i].cmp_len) &&
  50                    !strncmp(arg, cmt_fmts[i].n, strlen(arg))) {
  51                        if (cmt_fmts[i].v == CMIT_FMT_ONELINE)
  52                                rev->use_terminator = 1;
  53                        rev->commit_format = cmt_fmts[i].v;
  54                        return;
  55                }
  56        }
  57        if (strchr(arg, '%')) {
  58                save_user_format(rev, arg, 1);
  59                return;
  60        }
  61
  62        die("invalid --pretty format: %s", arg);
  63}
  64
  65/*
  66 * Generic support for pretty-printing the header
  67 */
  68static int get_one_line(const char *msg)
  69{
  70        int ret = 0;
  71
  72        for (;;) {
  73                char c = *msg++;
  74                if (!c)
  75                        break;
  76                ret++;
  77                if (c == '\n')
  78                        break;
  79        }
  80        return ret;
  81}
  82
  83/* High bit set, or ISO-2022-INT */
  84int non_ascii(int ch)
  85{
  86        return !isascii(ch) || ch == '\033';
  87}
  88
  89int has_non_ascii(const char *s)
  90{
  91        int ch;
  92        if (!s)
  93                return 0;
  94        while ((ch = *s++) != '\0') {
  95                if (non_ascii(ch))
  96                        return 1;
  97        }
  98        return 0;
  99}
 100
 101static int is_rfc2047_special(char ch)
 102{
 103        return (non_ascii(ch) || (ch == '=') || (ch == '?') || (ch == '_'));
 104}
 105
 106static void add_rfc2047(struct strbuf *sb, const char *line, int len,
 107                       const char *encoding)
 108{
 109        int i, last;
 110
 111        for (i = 0; i < len; i++) {
 112                int ch = line[i];
 113                if (non_ascii(ch))
 114                        goto needquote;
 115                if ((i + 1 < len) && (ch == '=' && line[i+1] == '?'))
 116                        goto needquote;
 117        }
 118        strbuf_add(sb, line, len);
 119        return;
 120
 121needquote:
 122        strbuf_grow(sb, len * 3 + strlen(encoding) + 100);
 123        strbuf_addf(sb, "=?%s?q?", encoding);
 124        for (i = last = 0; i < len; i++) {
 125                unsigned ch = line[i] & 0xFF;
 126                /*
 127                 * We encode ' ' using '=20' even though rfc2047
 128                 * allows using '_' for readability.  Unfortunately,
 129                 * many programs do not understand this and just
 130                 * leave the underscore in place.
 131                 */
 132                if (is_rfc2047_special(ch) || ch == ' ') {
 133                        strbuf_add(sb, line + last, i - last);
 134                        strbuf_addf(sb, "=%02X", ch);
 135                        last = i + 1;
 136                }
 137        }
 138        strbuf_add(sb, line + last, len - last);
 139        strbuf_addstr(sb, "?=");
 140}
 141
 142void pp_user_info(const char *what, enum cmit_fmt fmt, struct strbuf *sb,
 143                  const char *line, enum date_mode dmode,
 144                  const char *encoding)
 145{
 146        char *date;
 147        int namelen;
 148        unsigned long time;
 149        int tz;
 150
 151        if (fmt == CMIT_FMT_ONELINE)
 152                return;
 153        date = strchr(line, '>');
 154        if (!date)
 155                return;
 156        namelen = ++date - line;
 157        time = strtoul(date, &date, 10);
 158        tz = strtol(date, NULL, 10);
 159
 160        if (fmt == CMIT_FMT_EMAIL) {
 161                char *name_tail = strchr(line, '<');
 162                int display_name_length;
 163                if (!name_tail)
 164                        return;
 165                while (line < name_tail && isspace(name_tail[-1]))
 166                        name_tail--;
 167                display_name_length = name_tail - line;
 168                strbuf_addstr(sb, "From: ");
 169                add_rfc2047(sb, line, display_name_length, encoding);
 170                strbuf_add(sb, name_tail, namelen - display_name_length);
 171                strbuf_addch(sb, '\n');
 172        } else {
 173                strbuf_addf(sb, "%s: %.*s%.*s\n", what,
 174                              (fmt == CMIT_FMT_FULLER) ? 4 : 0,
 175                              "    ", namelen, line);
 176        }
 177        switch (fmt) {
 178        case CMIT_FMT_MEDIUM:
 179                strbuf_addf(sb, "Date:   %s\n", show_date(time, tz, dmode));
 180                break;
 181        case CMIT_FMT_EMAIL:
 182                strbuf_addf(sb, "Date: %s\n", show_date(time, tz, DATE_RFC2822));
 183                break;
 184        case CMIT_FMT_FULLER:
 185                strbuf_addf(sb, "%sDate: %s\n", what, show_date(time, tz, dmode));
 186                break;
 187        default:
 188                /* notin' */
 189                break;
 190        }
 191}
 192
 193static int is_empty_line(const char *line, int *len_p)
 194{
 195        int len = *len_p;
 196        while (len && isspace(line[len-1]))
 197                len--;
 198        *len_p = len;
 199        return !len;
 200}
 201
 202static const char *skip_empty_lines(const char *msg)
 203{
 204        for (;;) {
 205                int linelen = get_one_line(msg);
 206                int ll = linelen;
 207                if (!linelen)
 208                        break;
 209                if (!is_empty_line(msg, &ll))
 210                        break;
 211                msg += linelen;
 212        }
 213        return msg;
 214}
 215
 216static void add_merge_info(enum cmit_fmt fmt, struct strbuf *sb,
 217                        const struct commit *commit, int abbrev)
 218{
 219        struct commit_list *parent = commit->parents;
 220
 221        if ((fmt == CMIT_FMT_ONELINE) || (fmt == CMIT_FMT_EMAIL) ||
 222            !parent || !parent->next)
 223                return;
 224
 225        strbuf_addstr(sb, "Merge:");
 226
 227        while (parent) {
 228                struct commit *p = parent->item;
 229                const char *hex = NULL;
 230                if (abbrev)
 231                        hex = find_unique_abbrev(p->object.sha1, abbrev);
 232                if (!hex)
 233                        hex = sha1_to_hex(p->object.sha1);
 234                parent = parent->next;
 235
 236                strbuf_addf(sb, " %s", hex);
 237        }
 238        strbuf_addch(sb, '\n');
 239}
 240
 241static char *get_header(const struct commit *commit, const char *key)
 242{
 243        int key_len = strlen(key);
 244        const char *line = commit->buffer;
 245
 246        for (;;) {
 247                const char *eol = strchr(line, '\n'), *next;
 248
 249                if (line == eol)
 250                        return NULL;
 251                if (!eol) {
 252                        eol = line + strlen(line);
 253                        next = NULL;
 254                } else
 255                        next = eol + 1;
 256                if (eol - line > key_len &&
 257                    !strncmp(line, key, key_len) &&
 258                    line[key_len] == ' ') {
 259                        return xmemdupz(line + key_len + 1, eol - line - key_len - 1);
 260                }
 261                line = next;
 262        }
 263}
 264
 265static char *replace_encoding_header(char *buf, const char *encoding)
 266{
 267        struct strbuf tmp = STRBUF_INIT;
 268        size_t start, len;
 269        char *cp = buf;
 270
 271        /* guess if there is an encoding header before a \n\n */
 272        while (strncmp(cp, "encoding ", strlen("encoding "))) {
 273                cp = strchr(cp, '\n');
 274                if (!cp || *++cp == '\n')
 275                        return buf;
 276        }
 277        start = cp - buf;
 278        cp = strchr(cp, '\n');
 279        if (!cp)
 280                return buf; /* should not happen but be defensive */
 281        len = cp + 1 - (buf + start);
 282
 283        strbuf_attach(&tmp, buf, strlen(buf), strlen(buf) + 1);
 284        if (is_encoding_utf8(encoding)) {
 285                /* we have re-coded to UTF-8; drop the header */
 286                strbuf_remove(&tmp, start, len);
 287        } else {
 288                /* just replaces XXXX in 'encoding XXXX\n' */
 289                strbuf_splice(&tmp, start + strlen("encoding "),
 290                                          len - strlen("encoding \n"),
 291                                          encoding, strlen(encoding));
 292        }
 293        return strbuf_detach(&tmp, NULL);
 294}
 295
 296static char *logmsg_reencode(const struct commit *commit,
 297                             const char *output_encoding)
 298{
 299        static const char *utf8 = "UTF-8";
 300        const char *use_encoding;
 301        char *encoding;
 302        char *out;
 303
 304        if (!*output_encoding)
 305                return NULL;
 306        encoding = get_header(commit, "encoding");
 307        use_encoding = encoding ? encoding : utf8;
 308        if (!strcmp(use_encoding, output_encoding))
 309                if (encoding) /* we'll strip encoding header later */
 310                        out = xstrdup(commit->buffer);
 311                else
 312                        return NULL; /* nothing to do */
 313        else
 314                out = reencode_string(commit->buffer,
 315                                      output_encoding, use_encoding);
 316        if (out)
 317                out = replace_encoding_header(out, output_encoding);
 318
 319        free(encoding);
 320        return out;
 321}
 322
 323static int mailmap_name(char *email, int email_len, char *name, int name_len)
 324{
 325        static struct string_list *mail_map;
 326        if (!mail_map) {
 327                mail_map = xcalloc(1, sizeof(*mail_map));
 328                read_mailmap(mail_map, NULL);
 329        }
 330        return mail_map->nr && map_user(mail_map, email, email_len, name, name_len);
 331}
 332
 333static size_t format_person_part(struct strbuf *sb, char part,
 334                                 const char *msg, int len, enum date_mode dmode)
 335{
 336        /* currently all placeholders have same length */
 337        const int placeholder_len = 2;
 338        int start, end, tz = 0;
 339        unsigned long date = 0;
 340        char *ep;
 341        const char *name_start, *name_end, *mail_start, *mail_end, *msg_end = msg+len;
 342        char person_name[1024];
 343        char person_mail[1024];
 344
 345        /* advance 'end' to point to email start delimiter */
 346        for (end = 0; end < len && msg[end] != '<'; end++)
 347                ; /* do nothing */
 348
 349        /*
 350         * When end points at the '<' that we found, it should have
 351         * matching '>' later, which means 'end' must be strictly
 352         * below len - 1.
 353         */
 354        if (end >= len - 2)
 355                goto skip;
 356
 357        /* Seek for both name and email part */
 358        name_start = msg;
 359        name_end = msg+end;
 360        while (name_end > name_start && isspace(*(name_end-1)))
 361                name_end--;
 362        mail_start = msg+end+1;
 363        mail_end = mail_start;
 364        while (mail_end < msg_end && *mail_end != '>')
 365                mail_end++;
 366        if (mail_end == msg_end)
 367                goto skip;
 368        end = mail_end-msg;
 369
 370        if (part == 'N' || part == 'E') { /* mailmap lookup */
 371                strlcpy(person_name, name_start, name_end-name_start+1);
 372                strlcpy(person_mail, mail_start, mail_end-mail_start+1);
 373                mailmap_name(person_mail, sizeof(person_mail), person_name, sizeof(person_name));
 374                name_start = person_name;
 375                name_end = name_start + strlen(person_name);
 376                mail_start = person_mail;
 377                mail_end = mail_start +  strlen(person_mail);
 378        }
 379        if (part == 'n' || part == 'N') {       /* name */
 380                strbuf_add(sb, name_start, name_end-name_start);
 381                return placeholder_len;
 382        }
 383        if (part == 'e' || part == 'E') {       /* email */
 384                strbuf_add(sb, mail_start, mail_end-mail_start);
 385                return placeholder_len;
 386        }
 387
 388        /* advance 'start' to point to date start delimiter */
 389        for (start = end + 1; start < len && isspace(msg[start]); start++)
 390                ; /* do nothing */
 391        if (start >= len)
 392                goto skip;
 393        date = strtoul(msg + start, &ep, 10);
 394        if (msg + start == ep)
 395                goto skip;
 396
 397        if (part == 't') {      /* date, UNIX timestamp */
 398                strbuf_add(sb, msg + start, ep - (msg + start));
 399                return placeholder_len;
 400        }
 401
 402        /* parse tz */
 403        for (start = ep - msg + 1; start < len && isspace(msg[start]); start++)
 404                ; /* do nothing */
 405        if (start + 1 < len) {
 406                tz = strtoul(msg + start + 1, NULL, 10);
 407                if (msg[start] == '-')
 408                        tz = -tz;
 409        }
 410
 411        switch (part) {
 412        case 'd':       /* date */
 413                strbuf_addstr(sb, show_date(date, tz, dmode));
 414                return placeholder_len;
 415        case 'D':       /* date, RFC2822 style */
 416                strbuf_addstr(sb, show_date(date, tz, DATE_RFC2822));
 417                return placeholder_len;
 418        case 'r':       /* date, relative */
 419                strbuf_addstr(sb, show_date(date, tz, DATE_RELATIVE));
 420                return placeholder_len;
 421        case 'i':       /* date, ISO 8601 */
 422                strbuf_addstr(sb, show_date(date, tz, DATE_ISO8601));
 423                return placeholder_len;
 424        }
 425
 426skip:
 427        /*
 428         * bogus commit, 'sb' cannot be updated, but we still need to
 429         * compute a valid return value.
 430         */
 431        if (part == 'n' || part == 'e' || part == 't' || part == 'd'
 432            || part == 'D' || part == 'r' || part == 'i')
 433                return placeholder_len;
 434
 435        return 0; /* unknown placeholder */
 436}
 437
 438struct chunk {
 439        size_t off;
 440        size_t len;
 441};
 442
 443struct format_commit_context {
 444        const struct commit *commit;
 445        enum date_mode dmode;
 446        unsigned commit_header_parsed:1;
 447        unsigned commit_message_parsed:1;
 448
 449        /* These offsets are relative to the start of the commit message. */
 450        struct chunk author;
 451        struct chunk committer;
 452        struct chunk encoding;
 453        size_t message_off;
 454        size_t subject_off;
 455        size_t body_off;
 456
 457        /* The following ones are relative to the result struct strbuf. */
 458        struct chunk abbrev_commit_hash;
 459        struct chunk abbrev_tree_hash;
 460        struct chunk abbrev_parent_hashes;
 461};
 462
 463static int add_again(struct strbuf *sb, struct chunk *chunk)
 464{
 465        if (chunk->len) {
 466                strbuf_adddup(sb, chunk->off, chunk->len);
 467                return 1;
 468        }
 469
 470        /*
 471         * We haven't seen this chunk before.  Our caller is surely
 472         * going to add it the hard way now.  Remember the most likely
 473         * start of the to-be-added chunk: the current end of the
 474         * struct strbuf.
 475         */
 476        chunk->off = sb->len;
 477        return 0;
 478}
 479
 480static void parse_commit_header(struct format_commit_context *context)
 481{
 482        const char *msg = context->commit->buffer;
 483        int i;
 484
 485        for (i = 0; msg[i]; i++) {
 486                int eol;
 487                for (eol = i; msg[eol] && msg[eol] != '\n'; eol++)
 488                        ; /* do nothing */
 489
 490                if (i == eol) {
 491                        break;
 492                } else if (!prefixcmp(msg + i, "author ")) {
 493                        context->author.off = i + 7;
 494                        context->author.len = eol - i - 7;
 495                } else if (!prefixcmp(msg + i, "committer ")) {
 496                        context->committer.off = i + 10;
 497                        context->committer.len = eol - i - 10;
 498                } else if (!prefixcmp(msg + i, "encoding ")) {
 499                        context->encoding.off = i + 9;
 500                        context->encoding.len = eol - i - 9;
 501                }
 502                i = eol;
 503        }
 504        context->message_off = i;
 505        context->commit_header_parsed = 1;
 506}
 507
 508static int istitlechar(char c)
 509{
 510        return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') ||
 511                (c >= '0' && c <= '9') || c == '.' || c == '_';
 512}
 513
 514static void format_sanitized_subject(struct strbuf *sb, const char *msg)
 515{
 516        size_t trimlen;
 517        size_t start_len = sb->len;
 518        int space = 2;
 519
 520        for (; *msg && *msg != '\n'; msg++) {
 521                if (istitlechar(*msg)) {
 522                        if (space == 1)
 523                                strbuf_addch(sb, '-');
 524                        space = 0;
 525                        strbuf_addch(sb, *msg);
 526                        if (*msg == '.')
 527                                while (*(msg+1) == '.')
 528                                        msg++;
 529                } else
 530                        space |= 1;
 531        }
 532
 533        /* trim any trailing '.' or '-' characters */
 534        trimlen = 0;
 535        while (sb->len - trimlen > start_len &&
 536                (sb->buf[sb->len - 1 - trimlen] == '.'
 537                || sb->buf[sb->len - 1 - trimlen] == '-'))
 538                trimlen++;
 539        strbuf_remove(sb, sb->len - trimlen, trimlen);
 540}
 541
 542const char *format_subject(struct strbuf *sb, const char *msg,
 543                           const char *line_separator)
 544{
 545        int first = 1;
 546
 547        for (;;) {
 548                const char *line = msg;
 549                int linelen = get_one_line(line);
 550
 551                msg += linelen;
 552                if (!linelen || is_empty_line(line, &linelen))
 553                        break;
 554
 555                if (!sb)
 556                        continue;
 557                strbuf_grow(sb, linelen + 2);
 558                if (!first)
 559                        strbuf_addstr(sb, line_separator);
 560                strbuf_add(sb, line, linelen);
 561                first = 0;
 562        }
 563        return msg;
 564}
 565
 566static void parse_commit_message(struct format_commit_context *c)
 567{
 568        const char *msg = c->commit->buffer + c->message_off;
 569        const char *start = c->commit->buffer;
 570
 571        msg = skip_empty_lines(msg);
 572        c->subject_off = msg - start;
 573
 574        msg = format_subject(NULL, msg, NULL);
 575        msg = skip_empty_lines(msg);
 576        c->body_off = msg - start;
 577
 578        c->commit_message_parsed = 1;
 579}
 580
 581static void format_decoration(struct strbuf *sb, const struct commit *commit)
 582{
 583        struct name_decoration *d;
 584        const char *prefix = " (";
 585
 586        load_ref_decorations(DECORATE_SHORT_REFS);
 587        d = lookup_decoration(&name_decoration, &commit->object);
 588        while (d) {
 589                strbuf_addstr(sb, prefix);
 590                prefix = ", ";
 591                strbuf_addstr(sb, d->name);
 592                d = d->next;
 593        }
 594        if (prefix[0] == ',')
 595                strbuf_addch(sb, ')');
 596}
 597
 598static size_t format_commit_item(struct strbuf *sb, const char *placeholder,
 599                               void *context)
 600{
 601        struct format_commit_context *c = context;
 602        const struct commit *commit = c->commit;
 603        const char *msg = commit->buffer;
 604        struct commit_list *p;
 605        int h1, h2;
 606
 607        /* these are independent of the commit */
 608        switch (placeholder[0]) {
 609        case 'C':
 610                if (placeholder[1] == '(') {
 611                        const char *end = strchr(placeholder + 2, ')');
 612                        char color[COLOR_MAXLEN];
 613                        if (!end)
 614                                return 0;
 615                        color_parse_mem(placeholder + 2,
 616                                        end - (placeholder + 2),
 617                                        "--pretty format", color);
 618                        strbuf_addstr(sb, color);
 619                        return end - placeholder + 1;
 620                }
 621                if (!prefixcmp(placeholder + 1, "red")) {
 622                        strbuf_addstr(sb, GIT_COLOR_RED);
 623                        return 4;
 624                } else if (!prefixcmp(placeholder + 1, "green")) {
 625                        strbuf_addstr(sb, GIT_COLOR_GREEN);
 626                        return 6;
 627                } else if (!prefixcmp(placeholder + 1, "blue")) {
 628                        strbuf_addstr(sb, GIT_COLOR_BLUE);
 629                        return 5;
 630                } else if (!prefixcmp(placeholder + 1, "reset")) {
 631                        strbuf_addstr(sb, GIT_COLOR_RESET);
 632                        return 6;
 633                } else
 634                        return 0;
 635        case 'n':               /* newline */
 636                strbuf_addch(sb, '\n');
 637                return 1;
 638        case 'x':
 639                /* %x00 == NUL, %x0a == LF, etc. */
 640                if (0 <= (h1 = hexval_table[0xff & placeholder[1]]) &&
 641                    h1 <= 16 &&
 642                    0 <= (h2 = hexval_table[0xff & placeholder[2]]) &&
 643                    h2 <= 16) {
 644                        strbuf_addch(sb, (h1<<4)|h2);
 645                        return 3;
 646                } else
 647                        return 0;
 648        }
 649
 650        /* these depend on the commit */
 651        if (!commit->object.parsed)
 652                parse_object(commit->object.sha1);
 653
 654        switch (placeholder[0]) {
 655        case 'H':               /* commit hash */
 656                strbuf_addstr(sb, sha1_to_hex(commit->object.sha1));
 657                return 1;
 658        case 'h':               /* abbreviated commit hash */
 659                if (add_again(sb, &c->abbrev_commit_hash))
 660                        return 1;
 661                strbuf_addstr(sb, find_unique_abbrev(commit->object.sha1,
 662                                                     DEFAULT_ABBREV));
 663                c->abbrev_commit_hash.len = sb->len - c->abbrev_commit_hash.off;
 664                return 1;
 665        case 'T':               /* tree hash */
 666                strbuf_addstr(sb, sha1_to_hex(commit->tree->object.sha1));
 667                return 1;
 668        case 't':               /* abbreviated tree hash */
 669                if (add_again(sb, &c->abbrev_tree_hash))
 670                        return 1;
 671                strbuf_addstr(sb, find_unique_abbrev(commit->tree->object.sha1,
 672                                                     DEFAULT_ABBREV));
 673                c->abbrev_tree_hash.len = sb->len - c->abbrev_tree_hash.off;
 674                return 1;
 675        case 'P':               /* parent hashes */
 676                for (p = commit->parents; p; p = p->next) {
 677                        if (p != commit->parents)
 678                                strbuf_addch(sb, ' ');
 679                        strbuf_addstr(sb, sha1_to_hex(p->item->object.sha1));
 680                }
 681                return 1;
 682        case 'p':               /* abbreviated parent hashes */
 683                if (add_again(sb, &c->abbrev_parent_hashes))
 684                        return 1;
 685                for (p = commit->parents; p; p = p->next) {
 686                        if (p != commit->parents)
 687                                strbuf_addch(sb, ' ');
 688                        strbuf_addstr(sb, find_unique_abbrev(
 689                                        p->item->object.sha1, DEFAULT_ABBREV));
 690                }
 691                c->abbrev_parent_hashes.len = sb->len -
 692                                              c->abbrev_parent_hashes.off;
 693                return 1;
 694        case 'm':               /* left/right/bottom */
 695                strbuf_addch(sb, (commit->object.flags & BOUNDARY)
 696                                 ? '-'
 697                                 : (commit->object.flags & SYMMETRIC_LEFT)
 698                                 ? '<'
 699                                 : '>');
 700                return 1;
 701        case 'd':
 702                format_decoration(sb, commit);
 703                return 1;
 704        }
 705
 706        /* For the rest we have to parse the commit header. */
 707        if (!c->commit_header_parsed)
 708                parse_commit_header(c);
 709
 710        switch (placeholder[0]) {
 711        case 'a':       /* author ... */
 712                return format_person_part(sb, placeholder[1],
 713                                   msg + c->author.off, c->author.len,
 714                                   c->dmode);
 715        case 'c':       /* committer ... */
 716                return format_person_part(sb, placeholder[1],
 717                                   msg + c->committer.off, c->committer.len,
 718                                   c->dmode);
 719        case 'e':       /* encoding */
 720                strbuf_add(sb, msg + c->encoding.off, c->encoding.len);
 721                return 1;
 722        }
 723
 724        /* Now we need to parse the commit message. */
 725        if (!c->commit_message_parsed)
 726                parse_commit_message(c);
 727
 728        switch (placeholder[0]) {
 729        case 's':       /* subject */
 730                format_subject(sb, msg + c->subject_off, " ");
 731                return 1;
 732        case 'f':       /* sanitized subject */
 733                format_sanitized_subject(sb, msg + c->subject_off);
 734                return 1;
 735        case 'b':       /* body */
 736                strbuf_addstr(sb, msg + c->body_off);
 737                return 1;
 738        }
 739        return 0;       /* unknown placeholder */
 740}
 741
 742void format_commit_message(const struct commit *commit,
 743                           const void *format, struct strbuf *sb,
 744                           enum date_mode dmode)
 745{
 746        struct format_commit_context context;
 747
 748        memset(&context, 0, sizeof(context));
 749        context.commit = commit;
 750        context.dmode = dmode;
 751        strbuf_expand(sb, format, format_commit_item, &context);
 752}
 753
 754static void pp_header(enum cmit_fmt fmt,
 755                      int abbrev,
 756                      enum date_mode dmode,
 757                      const char *encoding,
 758                      const struct commit *commit,
 759                      const char **msg_p,
 760                      struct strbuf *sb)
 761{
 762        int parents_shown = 0;
 763
 764        for (;;) {
 765                const char *line = *msg_p;
 766                int linelen = get_one_line(*msg_p);
 767
 768                if (!linelen)
 769                        return;
 770                *msg_p += linelen;
 771
 772                if (linelen == 1)
 773                        /* End of header */
 774                        return;
 775
 776                if (fmt == CMIT_FMT_RAW) {
 777                        strbuf_add(sb, line, linelen);
 778                        continue;
 779                }
 780
 781                if (!memcmp(line, "parent ", 7)) {
 782                        if (linelen != 48)
 783                                die("bad parent line in commit");
 784                        continue;
 785                }
 786
 787                if (!parents_shown) {
 788                        struct commit_list *parent;
 789                        int num;
 790                        for (parent = commit->parents, num = 0;
 791                             parent;
 792                             parent = parent->next, num++)
 793                                ;
 794                        /* with enough slop */
 795                        strbuf_grow(sb, num * 50 + 20);
 796                        add_merge_info(fmt, sb, commit, abbrev);
 797                        parents_shown = 1;
 798                }
 799
 800                /*
 801                 * MEDIUM == DEFAULT shows only author with dates.
 802                 * FULL shows both authors but not dates.
 803                 * FULLER shows both authors and dates.
 804                 */
 805                if (!memcmp(line, "author ", 7)) {
 806                        strbuf_grow(sb, linelen + 80);
 807                        pp_user_info("Author", fmt, sb, line + 7, dmode, encoding);
 808                }
 809                if (!memcmp(line, "committer ", 10) &&
 810                    (fmt == CMIT_FMT_FULL || fmt == CMIT_FMT_FULLER)) {
 811                        strbuf_grow(sb, linelen + 80);
 812                        pp_user_info("Commit", fmt, sb, line + 10, dmode, encoding);
 813                }
 814        }
 815}
 816
 817void pp_title_line(enum cmit_fmt fmt,
 818                   const char **msg_p,
 819                   struct strbuf *sb,
 820                   const char *subject,
 821                   const char *after_subject,
 822                   const char *encoding,
 823                   int need_8bit_cte)
 824{
 825        const char *line_separator = (fmt == CMIT_FMT_EMAIL) ? "\n " : " ";
 826        struct strbuf title;
 827
 828        strbuf_init(&title, 80);
 829        *msg_p = format_subject(&title, *msg_p, line_separator);
 830
 831        strbuf_grow(sb, title.len + 1024);
 832        if (subject) {
 833                strbuf_addstr(sb, subject);
 834                add_rfc2047(sb, title.buf, title.len, encoding);
 835        } else {
 836                strbuf_addbuf(sb, &title);
 837        }
 838        strbuf_addch(sb, '\n');
 839
 840        if (need_8bit_cte > 0) {
 841                const char *header_fmt =
 842                        "MIME-Version: 1.0\n"
 843                        "Content-Type: text/plain; charset=%s\n"
 844                        "Content-Transfer-Encoding: 8bit\n";
 845                strbuf_addf(sb, header_fmt, encoding);
 846        }
 847        if (after_subject) {
 848                strbuf_addstr(sb, after_subject);
 849        }
 850        if (fmt == CMIT_FMT_EMAIL) {
 851                strbuf_addch(sb, '\n');
 852        }
 853        strbuf_release(&title);
 854}
 855
 856void pp_remainder(enum cmit_fmt fmt,
 857                  const char **msg_p,
 858                  struct strbuf *sb,
 859                  int indent)
 860{
 861        int first = 1;
 862        for (;;) {
 863                const char *line = *msg_p;
 864                int linelen = get_one_line(line);
 865                *msg_p += linelen;
 866
 867                if (!linelen)
 868                        break;
 869
 870                if (is_empty_line(line, &linelen)) {
 871                        if (first)
 872                                continue;
 873                        if (fmt == CMIT_FMT_SHORT)
 874                                break;
 875                }
 876                first = 0;
 877
 878                strbuf_grow(sb, linelen + indent + 20);
 879                if (indent) {
 880                        memset(sb->buf + sb->len, ' ', indent);
 881                        strbuf_setlen(sb, sb->len + indent);
 882                }
 883                strbuf_add(sb, line, linelen);
 884                strbuf_addch(sb, '\n');
 885        }
 886}
 887
 888char *reencode_commit_message(const struct commit *commit, const char **encoding_p)
 889{
 890        const char *encoding;
 891
 892        encoding = (git_log_output_encoding
 893                    ? git_log_output_encoding
 894                    : git_commit_encoding);
 895        if (!encoding)
 896                encoding = "UTF-8";
 897        if (encoding_p)
 898                *encoding_p = encoding;
 899        return logmsg_reencode(commit, encoding);
 900}
 901
 902void pretty_print_commit(enum cmit_fmt fmt, const struct commit *commit,
 903                         struct strbuf *sb, int abbrev,
 904                         const char *subject, const char *after_subject,
 905                         enum date_mode dmode, int need_8bit_cte)
 906{
 907        unsigned long beginning_of_body;
 908        int indent = 4;
 909        const char *msg = commit->buffer;
 910        char *reencoded;
 911        const char *encoding;
 912
 913        if (fmt == CMIT_FMT_USERFORMAT) {
 914                format_commit_message(commit, user_format, sb, dmode);
 915                return;
 916        }
 917
 918        reencoded = reencode_commit_message(commit, &encoding);
 919        if (reencoded) {
 920                msg = reencoded;
 921        }
 922
 923        if (fmt == CMIT_FMT_ONELINE || fmt == CMIT_FMT_EMAIL)
 924                indent = 0;
 925
 926        /*
 927         * We need to check and emit Content-type: to mark it
 928         * as 8-bit if we haven't done so.
 929         */
 930        if (fmt == CMIT_FMT_EMAIL && need_8bit_cte == 0) {
 931                int i, ch, in_body;
 932
 933                for (in_body = i = 0; (ch = msg[i]); i++) {
 934                        if (!in_body) {
 935                                /* author could be non 7-bit ASCII but
 936                                 * the log may be so; skip over the
 937                                 * header part first.
 938                                 */
 939                                if (ch == '\n' && msg[i+1] == '\n')
 940                                        in_body = 1;
 941                        }
 942                        else if (non_ascii(ch)) {
 943                                need_8bit_cte = 1;
 944                                break;
 945                        }
 946                }
 947        }
 948
 949        pp_header(fmt, abbrev, dmode, encoding, commit, &msg, sb);
 950        if (fmt != CMIT_FMT_ONELINE && !subject) {
 951                strbuf_addch(sb, '\n');
 952        }
 953
 954        /* Skip excess blank lines at the beginning of body, if any... */
 955        msg = skip_empty_lines(msg);
 956
 957        /* These formats treat the title line specially. */
 958        if (fmt == CMIT_FMT_ONELINE || fmt == CMIT_FMT_EMAIL)
 959                pp_title_line(fmt, &msg, sb, subject,
 960                              after_subject, encoding, need_8bit_cte);
 961
 962        beginning_of_body = sb->len;
 963        if (fmt != CMIT_FMT_ONELINE)
 964                pp_remainder(fmt, &msg, sb, indent);
 965        strbuf_rtrim(sb);
 966
 967        /* Make sure there is an EOLN for the non-oneline case */
 968        if (fmt != CMIT_FMT_ONELINE)
 969                strbuf_addch(sb, '\n');
 970
 971        /*
 972         * The caller may append additional body text in e-mail
 973         * format.  Make sure we did not strip the blank line
 974         * between the header and the body.
 975         */
 976        if (fmt == CMIT_FMT_EMAIL && sb->len <= beginning_of_body)
 977                strbuf_addch(sb, '\n');
 978        free(reencoded);
 979}