Andrew's git / gitweb.git / pretty.c
?
pretty.con commit Introduce usagef() that takes a printf-style format (64b1cb7)
   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#include "reflog-walk.h"
  11
  12static char *user_format;
  13
  14static void save_user_format(struct rev_info *rev, const char *cp, int is_tformat)
  15{
  16        free(user_format);
  17        user_format = xstrdup(cp);
  18        if (is_tformat)
  19                rev->use_terminator = 1;
  20        rev->commit_format = CMIT_FMT_USERFORMAT;
  21}
  22
  23void get_commit_format(const char *arg, struct rev_info *rev)
  24{
  25        int i;
  26        static struct cmt_fmt_map {
  27                const char *n;
  28                size_t cmp_len;
  29                enum cmit_fmt v;
  30        } cmt_fmts[] = {
  31                { "raw",        1,      CMIT_FMT_RAW },
  32                { "medium",     1,      CMIT_FMT_MEDIUM },
  33                { "short",      1,      CMIT_FMT_SHORT },
  34                { "email",      1,      CMIT_FMT_EMAIL },
  35                { "full",       5,      CMIT_FMT_FULL },
  36                { "fuller",     5,      CMIT_FMT_FULLER },
  37                { "oneline",    1,      CMIT_FMT_ONELINE },
  38        };
  39
  40        rev->use_terminator = 0;
  41        if (!arg || !*arg) {
  42                rev->commit_format = CMIT_FMT_DEFAULT;
  43                return;
  44        }
  45        if (!prefixcmp(arg, "format:") || !prefixcmp(arg, "tformat:")) {
  46                save_user_format(rev, strchr(arg, ':') + 1, arg[0] == 't');
  47                return;
  48        }
  49        for (i = 0; i < ARRAY_SIZE(cmt_fmts); i++) {
  50                if (!strncmp(arg, cmt_fmts[i].n, cmt_fmts[i].cmp_len) &&
  51                    !strncmp(arg, cmt_fmts[i].n, strlen(arg))) {
  52                        if (cmt_fmts[i].v == CMIT_FMT_ONELINE)
  53                                rev->use_terminator = 1;
  54                        rev->commit_format = cmt_fmts[i].v;
  55                        return;
  56                }
  57        }
  58        if (strchr(arg, '%')) {
  59                save_user_format(rev, arg, 1);
  60                return;
  61        }
  62
  63        die("invalid --pretty format: %s", arg);
  64}
  65
  66/*
  67 * Generic support for pretty-printing the header
  68 */
  69static int get_one_line(const char *msg)
  70{
  71        int ret = 0;
  72
  73        for (;;) {
  74                char c = *msg++;
  75                if (!c)
  76                        break;
  77                ret++;
  78                if (c == '\n')
  79                        break;
  80        }
  81        return ret;
  82}
  83
  84/* High bit set, or ISO-2022-INT */
  85int non_ascii(int ch)
  86{
  87        return !isascii(ch) || ch == '\033';
  88}
  89
  90int has_non_ascii(const char *s)
  91{
  92        int ch;
  93        if (!s)
  94                return 0;
  95        while ((ch = *s++) != '\0') {
  96                if (non_ascii(ch))
  97                        return 1;
  98        }
  99        return 0;
 100}
 101
 102static int is_rfc2047_special(char ch)
 103{
 104        return (non_ascii(ch) || (ch == '=') || (ch == '?') || (ch == '_'));
 105}
 106
 107static void add_rfc2047(struct strbuf *sb, const char *line, int len,
 108                       const char *encoding)
 109{
 110        int i, last;
 111
 112        for (i = 0; i < len; i++) {
 113                int ch = line[i];
 114                if (non_ascii(ch))
 115                        goto needquote;
 116                if ((i + 1 < len) && (ch == '=' && line[i+1] == '?'))
 117                        goto needquote;
 118        }
 119        strbuf_add(sb, line, len);
 120        return;
 121
 122needquote:
 123        strbuf_grow(sb, len * 3 + strlen(encoding) + 100);
 124        strbuf_addf(sb, "=?%s?q?", encoding);
 125        for (i = last = 0; i < len; i++) {
 126                unsigned ch = line[i] & 0xFF;
 127                /*
 128                 * We encode ' ' using '=20' even though rfc2047
 129                 * allows using '_' for readability.  Unfortunately,
 130                 * many programs do not understand this and just
 131                 * leave the underscore in place.
 132                 */
 133                if (is_rfc2047_special(ch) || ch == ' ') {
 134                        strbuf_add(sb, line + last, i - last);
 135                        strbuf_addf(sb, "=%02X", ch);
 136                        last = i + 1;
 137                }
 138        }
 139        strbuf_add(sb, line + last, len - last);
 140        strbuf_addstr(sb, "?=");
 141}
 142
 143void pp_user_info(const char *what, enum cmit_fmt fmt, struct strbuf *sb,
 144                  const char *line, enum date_mode dmode,
 145                  const char *encoding)
 146{
 147        char *date;
 148        int namelen;
 149        unsigned long time;
 150        int tz;
 151
 152        if (fmt == CMIT_FMT_ONELINE)
 153                return;
 154        date = strchr(line, '>');
 155        if (!date)
 156                return;
 157        namelen = ++date - line;
 158        time = strtoul(date, &date, 10);
 159        tz = strtol(date, NULL, 10);
 160
 161        if (fmt == CMIT_FMT_EMAIL) {
 162                char *name_tail = strchr(line, '<');
 163                int display_name_length;
 164                if (!name_tail)
 165                        return;
 166                while (line < name_tail && isspace(name_tail[-1]))
 167                        name_tail--;
 168                display_name_length = name_tail - line;
 169                strbuf_addstr(sb, "From: ");
 170                add_rfc2047(sb, line, display_name_length, encoding);
 171                strbuf_add(sb, name_tail, namelen - display_name_length);
 172                strbuf_addch(sb, '\n');
 173        } else {
 174                strbuf_addf(sb, "%s: %.*s%.*s\n", what,
 175                              (fmt == CMIT_FMT_FULLER) ? 4 : 0,
 176                              "    ", namelen, line);
 177        }
 178        switch (fmt) {
 179        case CMIT_FMT_MEDIUM:
 180                strbuf_addf(sb, "Date:   %s\n", show_date(time, tz, dmode));
 181                break;
 182        case CMIT_FMT_EMAIL:
 183                strbuf_addf(sb, "Date: %s\n", show_date(time, tz, DATE_RFC2822));
 184                break;
 185        case CMIT_FMT_FULLER:
 186                strbuf_addf(sb, "%sDate: %s\n", what, show_date(time, tz, dmode));
 187                break;
 188        default:
 189                /* notin' */
 190                break;
 191        }
 192}
 193
 194static int is_empty_line(const char *line, int *len_p)
 195{
 196        int len = *len_p;
 197        while (len && isspace(line[len-1]))
 198                len--;
 199        *len_p = len;
 200        return !len;
 201}
 202
 203static const char *skip_empty_lines(const char *msg)
 204{
 205        for (;;) {
 206                int linelen = get_one_line(msg);
 207                int ll = linelen;
 208                if (!linelen)
 209                        break;
 210                if (!is_empty_line(msg, &ll))
 211                        break;
 212                msg += linelen;
 213        }
 214        return msg;
 215}
 216
 217static void add_merge_info(enum cmit_fmt fmt, struct strbuf *sb,
 218                        const struct commit *commit, int abbrev)
 219{
 220        struct commit_list *parent = commit->parents;
 221
 222        if ((fmt == CMIT_FMT_ONELINE) || (fmt == CMIT_FMT_EMAIL) ||
 223            !parent || !parent->next)
 224                return;
 225
 226        strbuf_addstr(sb, "Merge:");
 227
 228        while (parent) {
 229                struct commit *p = parent->item;
 230                const char *hex = NULL;
 231                if (abbrev)
 232                        hex = find_unique_abbrev(p->object.sha1, abbrev);
 233                if (!hex)
 234                        hex = sha1_to_hex(p->object.sha1);
 235                parent = parent->next;
 236
 237                strbuf_addf(sb, " %s", hex);
 238        }
 239        strbuf_addch(sb, '\n');
 240}
 241
 242static char *get_header(const struct commit *commit, const char *key)
 243{
 244        int key_len = strlen(key);
 245        const char *line = commit->buffer;
 246
 247        for (;;) {
 248                const char *eol = strchr(line, '\n'), *next;
 249
 250                if (line == eol)
 251                        return NULL;
 252                if (!eol) {
 253                        eol = line + strlen(line);
 254                        next = NULL;
 255                } else
 256                        next = eol + 1;
 257                if (eol - line > key_len &&
 258                    !strncmp(line, key, key_len) &&
 259                    line[key_len] == ' ') {
 260                        return xmemdupz(line + key_len + 1, eol - line - key_len - 1);
 261                }
 262                line = next;
 263        }
 264}
 265
 266static char *replace_encoding_header(char *buf, const char *encoding)
 267{
 268        struct strbuf tmp = STRBUF_INIT;
 269        size_t start, len;
 270        char *cp = buf;
 271
 272        /* guess if there is an encoding header before a \n\n */
 273        while (strncmp(cp, "encoding ", strlen("encoding "))) {
 274                cp = strchr(cp, '\n');
 275                if (!cp || *++cp == '\n')
 276                        return buf;
 277        }
 278        start = cp - buf;
 279        cp = strchr(cp, '\n');
 280        if (!cp)
 281                return buf; /* should not happen but be defensive */
 282        len = cp + 1 - (buf + start);
 283
 284        strbuf_attach(&tmp, buf, strlen(buf), strlen(buf) + 1);
 285        if (is_encoding_utf8(encoding)) {
 286                /* we have re-coded to UTF-8; drop the header */
 287                strbuf_remove(&tmp, start, len);
 288        } else {
 289                /* just replaces XXXX in 'encoding XXXX\n' */
 290                strbuf_splice(&tmp, start + strlen("encoding "),
 291                                          len - strlen("encoding \n"),
 292                                          encoding, strlen(encoding));
 293        }
 294        return strbuf_detach(&tmp, NULL);
 295}
 296
 297static char *logmsg_reencode(const struct commit *commit,
 298                             const char *output_encoding)
 299{
 300        static const char *utf8 = "UTF-8";
 301        const char *use_encoding;
 302        char *encoding;
 303        char *out;
 304
 305        if (!*output_encoding)
 306                return NULL;
 307        encoding = get_header(commit, "encoding");
 308        use_encoding = encoding ? encoding : utf8;
 309        if (!strcmp(use_encoding, output_encoding))
 310                if (encoding) /* we'll strip encoding header later */
 311                        out = xstrdup(commit->buffer);
 312                else
 313                        return NULL; /* nothing to do */
 314        else
 315                out = reencode_string(commit->buffer,
 316                                      output_encoding, use_encoding);
 317        if (out)
 318                out = replace_encoding_header(out, output_encoding);
 319
 320        free(encoding);
 321        return out;
 322}
 323
 324static int mailmap_name(char *email, int email_len, char *name, int name_len)
 325{
 326        static struct string_list *mail_map;
 327        if (!mail_map) {
 328                mail_map = xcalloc(1, sizeof(*mail_map));
 329                read_mailmap(mail_map, NULL);
 330        }
 331        return mail_map->nr && map_user(mail_map, email, email_len, name, name_len);
 332}
 333
 334static size_t format_person_part(struct strbuf *sb, char part,
 335                                 const char *msg, int len, enum date_mode dmode)
 336{
 337        /* currently all placeholders have same length */
 338        const int placeholder_len = 2;
 339        int start, end, tz = 0;
 340        unsigned long date = 0;
 341        char *ep;
 342        const char *name_start, *name_end, *mail_start, *mail_end, *msg_end = msg+len;
 343        char person_name[1024];
 344        char person_mail[1024];
 345
 346        /* advance 'end' to point to email start delimiter */
 347        for (end = 0; end < len && msg[end] != '<'; end++)
 348                ; /* do nothing */
 349
 350        /*
 351         * When end points at the '<' that we found, it should have
 352         * matching '>' later, which means 'end' must be strictly
 353         * below len - 1.
 354         */
 355        if (end >= len - 2)
 356                goto skip;
 357
 358        /* Seek for both name and email part */
 359        name_start = msg;
 360        name_end = msg+end;
 361        while (name_end > name_start && isspace(*(name_end-1)))
 362                name_end--;
 363        mail_start = msg+end+1;
 364        mail_end = mail_start;
 365        while (mail_end < msg_end && *mail_end != '>')
 366                mail_end++;
 367        if (mail_end == msg_end)
 368                goto skip;
 369        end = mail_end-msg;
 370
 371        if (part == 'N' || part == 'E') { /* mailmap lookup */
 372                strlcpy(person_name, name_start, name_end-name_start+1);
 373                strlcpy(person_mail, mail_start, mail_end-mail_start+1);
 374                mailmap_name(person_mail, sizeof(person_mail), person_name, sizeof(person_name));
 375                name_start = person_name;
 376                name_end = name_start + strlen(person_name);
 377                mail_start = person_mail;
 378                mail_end = mail_start +  strlen(person_mail);
 379        }
 380        if (part == 'n' || part == 'N') {       /* name */
 381                strbuf_add(sb, name_start, name_end-name_start);
 382                return placeholder_len;
 383        }
 384        if (part == 'e' || part == 'E') {       /* email */
 385                strbuf_add(sb, mail_start, mail_end-mail_start);
 386                return placeholder_len;
 387        }
 388
 389        /* advance 'start' to point to date start delimiter */
 390        for (start = end + 1; start < len && isspace(msg[start]); start++)
 391                ; /* do nothing */
 392        if (start >= len)
 393                goto skip;
 394        date = strtoul(msg + start, &ep, 10);
 395        if (msg + start == ep)
 396                goto skip;
 397
 398        if (part == 't') {      /* date, UNIX timestamp */
 399                strbuf_add(sb, msg + start, ep - (msg + start));
 400                return placeholder_len;
 401        }
 402
 403        /* parse tz */
 404        for (start = ep - msg + 1; start < len && isspace(msg[start]); start++)
 405                ; /* do nothing */
 406        if (start + 1 < len) {
 407                tz = strtoul(msg + start + 1, NULL, 10);
 408                if (msg[start] == '-')
 409                        tz = -tz;
 410        }
 411
 412        switch (part) {
 413        case 'd':       /* date */
 414                strbuf_addstr(sb, show_date(date, tz, dmode));
 415                return placeholder_len;
 416        case 'D':       /* date, RFC2822 style */
 417                strbuf_addstr(sb, show_date(date, tz, DATE_RFC2822));
 418                return placeholder_len;
 419        case 'r':       /* date, relative */
 420                strbuf_addstr(sb, show_date(date, tz, DATE_RELATIVE));
 421                return placeholder_len;
 422        case 'i':       /* date, ISO 8601 */
 423                strbuf_addstr(sb, show_date(date, tz, DATE_ISO8601));
 424                return placeholder_len;
 425        }
 426
 427skip:
 428        /*
 429         * bogus commit, 'sb' cannot be updated, but we still need to
 430         * compute a valid return value.
 431         */
 432        if (part == 'n' || part == 'e' || part == 't' || part == 'd'
 433            || part == 'D' || part == 'r' || part == 'i')
 434                return placeholder_len;
 435
 436        return 0; /* unknown placeholder */
 437}
 438
 439struct chunk {
 440        size_t off;
 441        size_t len;
 442};
 443
 444struct format_commit_context {
 445        const struct commit *commit;
 446        const struct pretty_print_context *pretty_ctx;
 447        unsigned commit_header_parsed:1;
 448        unsigned commit_message_parsed:1;
 449
 450        /* These offsets are relative to the start of the commit message. */
 451        struct chunk author;
 452        struct chunk committer;
 453        struct chunk encoding;
 454        size_t message_off;
 455        size_t subject_off;
 456        size_t body_off;
 457
 458        /* The following ones are relative to the result struct strbuf. */
 459        struct chunk abbrev_commit_hash;
 460        struct chunk abbrev_tree_hash;
 461        struct chunk abbrev_parent_hashes;
 462};
 463
 464static int add_again(struct strbuf *sb, struct chunk *chunk)
 465{
 466        if (chunk->len) {
 467                strbuf_adddup(sb, chunk->off, chunk->len);
 468                return 1;
 469        }
 470
 471        /*
 472         * We haven't seen this chunk before.  Our caller is surely
 473         * going to add it the hard way now.  Remember the most likely
 474         * start of the to-be-added chunk: the current end of the
 475         * struct strbuf.
 476         */
 477        chunk->off = sb->len;
 478        return 0;
 479}
 480
 481static void parse_commit_header(struct format_commit_context *context)
 482{
 483        const char *msg = context->commit->buffer;
 484        int i;
 485
 486        for (i = 0; msg[i]; i++) {
 487                int eol;
 488                for (eol = i; msg[eol] && msg[eol] != '\n'; eol++)
 489                        ; /* do nothing */
 490
 491                if (i == eol) {
 492                        break;
 493                } else if (!prefixcmp(msg + i, "author ")) {
 494                        context->author.off = i + 7;
 495                        context->author.len = eol - i - 7;
 496                } else if (!prefixcmp(msg + i, "committer ")) {
 497                        context->committer.off = i + 10;
 498                        context->committer.len = eol - i - 10;
 499                } else if (!prefixcmp(msg + i, "encoding ")) {
 500                        context->encoding.off = i + 9;
 501                        context->encoding.len = eol - i - 9;
 502                }
 503                i = eol;
 504        }
 505        context->message_off = i;
 506        context->commit_header_parsed = 1;
 507}
 508
 509static int istitlechar(char c)
 510{
 511        return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') ||
 512                (c >= '0' && c <= '9') || c == '.' || c == '_';
 513}
 514
 515static void format_sanitized_subject(struct strbuf *sb, const char *msg)
 516{
 517        size_t trimlen;
 518        size_t start_len = sb->len;
 519        int space = 2;
 520
 521        for (; *msg && *msg != '\n'; msg++) {
 522                if (istitlechar(*msg)) {
 523                        if (space == 1)
 524                                strbuf_addch(sb, '-');
 525                        space = 0;
 526                        strbuf_addch(sb, *msg);
 527                        if (*msg == '.')
 528                                while (*(msg+1) == '.')
 529                                        msg++;
 530                } else
 531                        space |= 1;
 532        }
 533
 534        /* trim any trailing '.' or '-' characters */
 535        trimlen = 0;
 536        while (sb->len - trimlen > start_len &&
 537                (sb->buf[sb->len - 1 - trimlen] == '.'
 538                || sb->buf[sb->len - 1 - trimlen] == '-'))
 539                trimlen++;
 540        strbuf_remove(sb, sb->len - trimlen, trimlen);
 541}
 542
 543const char *format_subject(struct strbuf *sb, const char *msg,
 544                           const char *line_separator)
 545{
 546        int first = 1;
 547
 548        for (;;) {
 549                const char *line = msg;
 550                int linelen = get_one_line(line);
 551
 552                msg += linelen;
 553                if (!linelen || is_empty_line(line, &linelen))
 554                        break;
 555
 556                if (!sb)
 557                        continue;
 558                strbuf_grow(sb, linelen + 2);
 559                if (!first)
 560                        strbuf_addstr(sb, line_separator);
 561                strbuf_add(sb, line, linelen);
 562                first = 0;
 563        }
 564        return msg;
 565}
 566
 567static void parse_commit_message(struct format_commit_context *c)
 568{
 569        const char *msg = c->commit->buffer + c->message_off;
 570        const char *start = c->commit->buffer;
 571
 572        msg = skip_empty_lines(msg);
 573        c->subject_off = msg - start;
 574
 575        msg = format_subject(NULL, msg, NULL);
 576        msg = skip_empty_lines(msg);
 577        c->body_off = msg - start;
 578
 579        c->commit_message_parsed = 1;
 580}
 581
 582static void format_decoration(struct strbuf *sb, const struct commit *commit)
 583{
 584        struct name_decoration *d;
 585        const char *prefix = " (";
 586
 587        load_ref_decorations(DECORATE_SHORT_REFS);
 588        d = lookup_decoration(&name_decoration, &commit->object);
 589        while (d) {
 590                strbuf_addstr(sb, prefix);
 591                prefix = ", ";
 592                strbuf_addstr(sb, d->name);
 593                d = d->next;
 594        }
 595        if (prefix[0] == ',')
 596                strbuf_addch(sb, ')');
 597}
 598
 599static size_t format_commit_item(struct strbuf *sb, const char *placeholder,
 600                               void *context)
 601{
 602        struct format_commit_context *c = context;
 603        const struct commit *commit = c->commit;
 604        const char *msg = commit->buffer;
 605        struct commit_list *p;
 606        int h1, h2;
 607
 608        /* these are independent of the commit */
 609        switch (placeholder[0]) {
 610        case 'C':
 611                if (placeholder[1] == '(') {
 612                        const char *end = strchr(placeholder + 2, ')');
 613                        char color[COLOR_MAXLEN];
 614                        if (!end)
 615                                return 0;
 616                        color_parse_mem(placeholder + 2,
 617                                        end - (placeholder + 2),
 618                                        "--pretty format", color);
 619                        strbuf_addstr(sb, color);
 620                        return end - placeholder + 1;
 621                }
 622                if (!prefixcmp(placeholder + 1, "red")) {
 623                        strbuf_addstr(sb, GIT_COLOR_RED);
 624                        return 4;
 625                } else if (!prefixcmp(placeholder + 1, "green")) {
 626                        strbuf_addstr(sb, GIT_COLOR_GREEN);
 627                        return 6;
 628                } else if (!prefixcmp(placeholder + 1, "blue")) {
 629                        strbuf_addstr(sb, GIT_COLOR_BLUE);
 630                        return 5;
 631                } else if (!prefixcmp(placeholder + 1, "reset")) {
 632                        strbuf_addstr(sb, GIT_COLOR_RESET);
 633                        return 6;
 634                } else
 635                        return 0;
 636        case 'n':               /* newline */
 637                strbuf_addch(sb, '\n');
 638                return 1;
 639        case 'x':
 640                /* %x00 == NUL, %x0a == LF, etc. */
 641                if (0 <= (h1 = hexval_table[0xff & placeholder[1]]) &&
 642                    h1 <= 16 &&
 643                    0 <= (h2 = hexval_table[0xff & placeholder[2]]) &&
 644                    h2 <= 16) {
 645                        strbuf_addch(sb, (h1<<4)|h2);
 646                        return 3;
 647                } else
 648                        return 0;
 649        }
 650
 651        /* these depend on the commit */
 652        if (!commit->object.parsed)
 653                parse_object(commit->object.sha1);
 654
 655        switch (placeholder[0]) {
 656        case 'H':               /* commit hash */
 657                strbuf_addstr(sb, sha1_to_hex(commit->object.sha1));
 658                return 1;
 659        case 'h':               /* abbreviated commit hash */
 660                if (add_again(sb, &c->abbrev_commit_hash))
 661                        return 1;
 662                strbuf_addstr(sb, find_unique_abbrev(commit->object.sha1,
 663                                                     DEFAULT_ABBREV));
 664                c->abbrev_commit_hash.len = sb->len - c->abbrev_commit_hash.off;
 665                return 1;
 666        case 'T':               /* tree hash */
 667                strbuf_addstr(sb, sha1_to_hex(commit->tree->object.sha1));
 668                return 1;
 669        case 't':               /* abbreviated tree hash */
 670                if (add_again(sb, &c->abbrev_tree_hash))
 671                        return 1;
 672                strbuf_addstr(sb, find_unique_abbrev(commit->tree->object.sha1,
 673                                                     DEFAULT_ABBREV));
 674                c->abbrev_tree_hash.len = sb->len - c->abbrev_tree_hash.off;
 675                return 1;
 676        case 'P':               /* parent hashes */
 677                for (p = commit->parents; p; p = p->next) {
 678                        if (p != commit->parents)
 679                                strbuf_addch(sb, ' ');
 680                        strbuf_addstr(sb, sha1_to_hex(p->item->object.sha1));
 681                }
 682                return 1;
 683        case 'p':               /* abbreviated parent hashes */
 684                if (add_again(sb, &c->abbrev_parent_hashes))
 685                        return 1;
 686                for (p = commit->parents; p; p = p->next) {
 687                        if (p != commit->parents)
 688                                strbuf_addch(sb, ' ');
 689                        strbuf_addstr(sb, find_unique_abbrev(
 690                                        p->item->object.sha1, DEFAULT_ABBREV));
 691                }
 692                c->abbrev_parent_hashes.len = sb->len -
 693                                              c->abbrev_parent_hashes.off;
 694                return 1;
 695        case 'm':               /* left/right/bottom */
 696                strbuf_addch(sb, (commit->object.flags & BOUNDARY)
 697                                 ? '-'
 698                                 : (commit->object.flags & SYMMETRIC_LEFT)
 699                                 ? '<'
 700                                 : '>');
 701                return 1;
 702        case 'd':
 703                format_decoration(sb, commit);
 704                return 1;
 705        case 'g':               /* reflog info */
 706                switch(placeholder[1]) {
 707                case 'd':       /* reflog selector */
 708                case 'D':
 709                        if (c->pretty_ctx->reflog_info)
 710                                get_reflog_selector(sb,
 711                                                    c->pretty_ctx->reflog_info,
 712                                                    c->pretty_ctx->date_mode,
 713                                                    (placeholder[1] == 'd'));
 714                        return 2;
 715                case 's':       /* reflog message */
 716                        if (c->pretty_ctx->reflog_info)
 717                                get_reflog_message(sb, c->pretty_ctx->reflog_info);
 718                        return 2;
 719                }
 720                return 0;       /* unknown %g placeholder */
 721        }
 722
 723        /* For the rest we have to parse the commit header. */
 724        if (!c->commit_header_parsed)
 725                parse_commit_header(c);
 726
 727        switch (placeholder[0]) {
 728        case 'a':       /* author ... */
 729                return format_person_part(sb, placeholder[1],
 730                                   msg + c->author.off, c->author.len,
 731                                   c->pretty_ctx->date_mode);
 732        case 'c':       /* committer ... */
 733                return format_person_part(sb, placeholder[1],
 734                                   msg + c->committer.off, c->committer.len,
 735                                   c->pretty_ctx->date_mode);
 736        case 'e':       /* encoding */
 737                strbuf_add(sb, msg + c->encoding.off, c->encoding.len);
 738                return 1;
 739        }
 740
 741        /* Now we need to parse the commit message. */
 742        if (!c->commit_message_parsed)
 743                parse_commit_message(c);
 744
 745        switch (placeholder[0]) {
 746        case 's':       /* subject */
 747                format_subject(sb, msg + c->subject_off, " ");
 748                return 1;
 749        case 'f':       /* sanitized subject */
 750                format_sanitized_subject(sb, msg + c->subject_off);
 751                return 1;
 752        case 'b':       /* body */
 753                strbuf_addstr(sb, msg + c->body_off);
 754                return 1;
 755        }
 756        return 0;       /* unknown placeholder */
 757}
 758
 759void format_commit_message(const struct commit *commit,
 760                           const char *format, struct strbuf *sb,
 761                           const struct pretty_print_context *pretty_ctx)
 762{
 763        struct format_commit_context context;
 764
 765        memset(&context, 0, sizeof(context));
 766        context.commit = commit;
 767        context.pretty_ctx = pretty_ctx;
 768        strbuf_expand(sb, format, format_commit_item, &context);
 769}
 770
 771static void pp_header(enum cmit_fmt fmt,
 772                      int abbrev,
 773                      enum date_mode dmode,
 774                      const char *encoding,
 775                      const struct commit *commit,
 776                      const char **msg_p,
 777                      struct strbuf *sb)
 778{
 779        int parents_shown = 0;
 780
 781        for (;;) {
 782                const char *line = *msg_p;
 783                int linelen = get_one_line(*msg_p);
 784
 785                if (!linelen)
 786                        return;
 787                *msg_p += linelen;
 788
 789                if (linelen == 1)
 790                        /* End of header */
 791                        return;
 792
 793                if (fmt == CMIT_FMT_RAW) {
 794                        strbuf_add(sb, line, linelen);
 795                        continue;
 796                }
 797
 798                if (!memcmp(line, "parent ", 7)) {
 799                        if (linelen != 48)
 800                                die("bad parent line in commit");
 801                        continue;
 802                }
 803
 804                if (!parents_shown) {
 805                        struct commit_list *parent;
 806                        int num;
 807                        for (parent = commit->parents, num = 0;
 808                             parent;
 809                             parent = parent->next, num++)
 810                                ;
 811                        /* with enough slop */
 812                        strbuf_grow(sb, num * 50 + 20);
 813                        add_merge_info(fmt, sb, commit, abbrev);
 814                        parents_shown = 1;
 815                }
 816
 817                /*
 818                 * MEDIUM == DEFAULT shows only author with dates.
 819                 * FULL shows both authors but not dates.
 820                 * FULLER shows both authors and dates.
 821                 */
 822                if (!memcmp(line, "author ", 7)) {
 823                        strbuf_grow(sb, linelen + 80);
 824                        pp_user_info("Author", fmt, sb, line + 7, dmode, encoding);
 825                }
 826                if (!memcmp(line, "committer ", 10) &&
 827                    (fmt == CMIT_FMT_FULL || fmt == CMIT_FMT_FULLER)) {
 828                        strbuf_grow(sb, linelen + 80);
 829                        pp_user_info("Commit", fmt, sb, line + 10, dmode, encoding);
 830                }
 831        }
 832}
 833
 834void pp_title_line(enum cmit_fmt fmt,
 835                   const char **msg_p,
 836                   struct strbuf *sb,
 837                   const char *subject,
 838                   const char *after_subject,
 839                   const char *encoding,
 840                   int need_8bit_cte)
 841{
 842        const char *line_separator = (fmt == CMIT_FMT_EMAIL) ? "\n " : " ";
 843        struct strbuf title;
 844
 845        strbuf_init(&title, 80);
 846        *msg_p = format_subject(&title, *msg_p, line_separator);
 847
 848        strbuf_grow(sb, title.len + 1024);
 849        if (subject) {
 850                strbuf_addstr(sb, subject);
 851                add_rfc2047(sb, title.buf, title.len, encoding);
 852        } else {
 853                strbuf_addbuf(sb, &title);
 854        }
 855        strbuf_addch(sb, '\n');
 856
 857        if (need_8bit_cte > 0) {
 858                const char *header_fmt =
 859                        "MIME-Version: 1.0\n"
 860                        "Content-Type: text/plain; charset=%s\n"
 861                        "Content-Transfer-Encoding: 8bit\n";
 862                strbuf_addf(sb, header_fmt, encoding);
 863        }
 864        if (after_subject) {
 865                strbuf_addstr(sb, after_subject);
 866        }
 867        if (fmt == CMIT_FMT_EMAIL) {
 868                strbuf_addch(sb, '\n');
 869        }
 870        strbuf_release(&title);
 871}
 872
 873void pp_remainder(enum cmit_fmt fmt,
 874                  const char **msg_p,
 875                  struct strbuf *sb,
 876                  int indent)
 877{
 878        int first = 1;
 879        for (;;) {
 880                const char *line = *msg_p;
 881                int linelen = get_one_line(line);
 882                *msg_p += linelen;
 883
 884                if (!linelen)
 885                        break;
 886
 887                if (is_empty_line(line, &linelen)) {
 888                        if (first)
 889                                continue;
 890                        if (fmt == CMIT_FMT_SHORT)
 891                                break;
 892                }
 893                first = 0;
 894
 895                strbuf_grow(sb, linelen + indent + 20);
 896                if (indent) {
 897                        memset(sb->buf + sb->len, ' ', indent);
 898                        strbuf_setlen(sb, sb->len + indent);
 899                }
 900                strbuf_add(sb, line, linelen);
 901                strbuf_addch(sb, '\n');
 902        }
 903}
 904
 905char *reencode_commit_message(const struct commit *commit, const char **encoding_p)
 906{
 907        const char *encoding;
 908
 909        encoding = (git_log_output_encoding
 910                    ? git_log_output_encoding
 911                    : git_commit_encoding);
 912        if (!encoding)
 913                encoding = "UTF-8";
 914        if (encoding_p)
 915                *encoding_p = encoding;
 916        return logmsg_reencode(commit, encoding);
 917}
 918
 919void pretty_print_commit(enum cmit_fmt fmt, const struct commit *commit,
 920                         struct strbuf *sb,
 921                         const struct pretty_print_context *context)
 922{
 923        unsigned long beginning_of_body;
 924        int indent = 4;
 925        const char *msg = commit->buffer;
 926        char *reencoded;
 927        const char *encoding;
 928        int need_8bit_cte = context->need_8bit_cte;
 929
 930        if (fmt == CMIT_FMT_USERFORMAT) {
 931                format_commit_message(commit, user_format, sb, context);
 932                return;
 933        }
 934
 935        reencoded = reencode_commit_message(commit, &encoding);
 936        if (reencoded) {
 937                msg = reencoded;
 938        }
 939
 940        if (fmt == CMIT_FMT_ONELINE || fmt == CMIT_FMT_EMAIL)
 941                indent = 0;
 942
 943        /*
 944         * We need to check and emit Content-type: to mark it
 945         * as 8-bit if we haven't done so.
 946         */
 947        if (fmt == CMIT_FMT_EMAIL && need_8bit_cte == 0) {
 948                int i, ch, in_body;
 949
 950                for (in_body = i = 0; (ch = msg[i]); i++) {
 951                        if (!in_body) {
 952                                /* author could be non 7-bit ASCII but
 953                                 * the log may be so; skip over the
 954                                 * header part first.
 955                                 */
 956                                if (ch == '\n' && msg[i+1] == '\n')
 957                                        in_body = 1;
 958                        }
 959                        else if (non_ascii(ch)) {
 960                                need_8bit_cte = 1;
 961                                break;
 962                        }
 963                }
 964        }
 965
 966        pp_header(fmt, context->abbrev, context->date_mode, encoding,
 967                  commit, &msg, sb);
 968        if (fmt != CMIT_FMT_ONELINE && !context->subject) {
 969                strbuf_addch(sb, '\n');
 970        }
 971
 972        /* Skip excess blank lines at the beginning of body, if any... */
 973        msg = skip_empty_lines(msg);
 974
 975        /* These formats treat the title line specially. */
 976        if (fmt == CMIT_FMT_ONELINE || fmt == CMIT_FMT_EMAIL)
 977                pp_title_line(fmt, &msg, sb, context->subject,
 978                              context->after_subject, encoding, need_8bit_cte);
 979
 980        beginning_of_body = sb->len;
 981        if (fmt != CMIT_FMT_ONELINE)
 982                pp_remainder(fmt, &msg, sb, indent);
 983        strbuf_rtrim(sb);
 984
 985        /* Make sure there is an EOLN for the non-oneline case */
 986        if (fmt != CMIT_FMT_ONELINE)
 987                strbuf_addch(sb, '\n');
 988
 989        /*
 990         * The caller may append additional body text in e-mail
 991         * format.  Make sure we did not strip the blank line
 992         * between the header and the body.
 993         */
 994        if (fmt == CMIT_FMT_EMAIL && sb->len <= beginning_of_body)
 995                strbuf_addch(sb, '\n');
 996        free(reencoded);
 997}