Andrew's git / gitweb.git / pretty.c
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pretty.con commit archive: refactor file extension format-guessing (08716b3)
   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 "notes.h"
  10#include "color.h"
  11#include "reflog-walk.h"
  12
  13static char *user_format;
  14static struct cmt_fmt_map {
  15        const char *name;
  16        enum cmit_fmt format;
  17        int is_tformat;
  18        int is_alias;
  19        const char *user_format;
  20} *commit_formats;
  21static size_t builtin_formats_len;
  22static size_t commit_formats_len;
  23static size_t commit_formats_alloc;
  24static struct cmt_fmt_map *find_commit_format(const char *sought);
  25
  26static void save_user_format(struct rev_info *rev, const char *cp, int is_tformat)
  27{
  28        free(user_format);
  29        user_format = xstrdup(cp);
  30        if (is_tformat)
  31                rev->use_terminator = 1;
  32        rev->commit_format = CMIT_FMT_USERFORMAT;
  33}
  34
  35static int git_pretty_formats_config(const char *var, const char *value, void *cb)
  36{
  37        struct cmt_fmt_map *commit_format = NULL;
  38        const char *name;
  39        const char *fmt;
  40        int i;
  41
  42        if (prefixcmp(var, "pretty."))
  43                return 0;
  44
  45        name = var + strlen("pretty.");
  46        for (i = 0; i < builtin_formats_len; i++) {
  47                if (!strcmp(commit_formats[i].name, name))
  48                        return 0;
  49        }
  50
  51        for (i = builtin_formats_len; i < commit_formats_len; i++) {
  52                if (!strcmp(commit_formats[i].name, name)) {
  53                        commit_format = &commit_formats[i];
  54                        break;
  55                }
  56        }
  57
  58        if (!commit_format) {
  59                ALLOC_GROW(commit_formats, commit_formats_len+1,
  60                           commit_formats_alloc);
  61                commit_format = &commit_formats[commit_formats_len];
  62                memset(commit_format, 0, sizeof(*commit_format));
  63                commit_formats_len++;
  64        }
  65
  66        commit_format->name = xstrdup(name);
  67        commit_format->format = CMIT_FMT_USERFORMAT;
  68        git_config_string(&fmt, var, value);
  69        if (!prefixcmp(fmt, "format:") || !prefixcmp(fmt, "tformat:")) {
  70                commit_format->is_tformat = fmt[0] == 't';
  71                fmt = strchr(fmt, ':') + 1;
  72        } else if (strchr(fmt, '%'))
  73                commit_format->is_tformat = 1;
  74        else
  75                commit_format->is_alias = 1;
  76        commit_format->user_format = fmt;
  77
  78        return 0;
  79}
  80
  81static void setup_commit_formats(void)
  82{
  83        struct cmt_fmt_map builtin_formats[] = {
  84                { "raw",        CMIT_FMT_RAW,           0 },
  85                { "medium",     CMIT_FMT_MEDIUM,        0 },
  86                { "short",      CMIT_FMT_SHORT,         0 },
  87                { "email",      CMIT_FMT_EMAIL,         0 },
  88                { "fuller",     CMIT_FMT_FULLER,        0 },
  89                { "full",       CMIT_FMT_FULL,          0 },
  90                { "oneline",    CMIT_FMT_ONELINE,       1 }
  91        };
  92        commit_formats_len = ARRAY_SIZE(builtin_formats);
  93        builtin_formats_len = commit_formats_len;
  94        ALLOC_GROW(commit_formats, commit_formats_len, commit_formats_alloc);
  95        memcpy(commit_formats, builtin_formats,
  96               sizeof(*builtin_formats)*ARRAY_SIZE(builtin_formats));
  97
  98        git_config(git_pretty_formats_config, NULL);
  99}
 100
 101static struct cmt_fmt_map *find_commit_format_recursive(const char *sought,
 102                                                        const char *original,
 103                                                        int num_redirections)
 104{
 105        struct cmt_fmt_map *found = NULL;
 106        size_t found_match_len = 0;
 107        int i;
 108
 109        if (num_redirections >= commit_formats_len)
 110                die("invalid --pretty format: "
 111                    "'%s' references an alias which points to itself",
 112                    original);
 113
 114        for (i = 0; i < commit_formats_len; i++) {
 115                size_t match_len;
 116
 117                if (prefixcmp(commit_formats[i].name, sought))
 118                        continue;
 119
 120                match_len = strlen(commit_formats[i].name);
 121                if (found == NULL || found_match_len > match_len) {
 122                        found = &commit_formats[i];
 123                        found_match_len = match_len;
 124                }
 125        }
 126
 127        if (found && found->is_alias) {
 128                found = find_commit_format_recursive(found->user_format,
 129                                                     original,
 130                                                     num_redirections+1);
 131        }
 132
 133        return found;
 134}
 135
 136static struct cmt_fmt_map *find_commit_format(const char *sought)
 137{
 138        if (!commit_formats)
 139                setup_commit_formats();
 140
 141        return find_commit_format_recursive(sought, sought, 0);
 142}
 143
 144void get_commit_format(const char *arg, struct rev_info *rev)
 145{
 146        struct cmt_fmt_map *commit_format;
 147
 148        rev->use_terminator = 0;
 149        if (!arg || !*arg) {
 150                rev->commit_format = CMIT_FMT_DEFAULT;
 151                return;
 152        }
 153        if (!prefixcmp(arg, "format:") || !prefixcmp(arg, "tformat:")) {
 154                save_user_format(rev, strchr(arg, ':') + 1, arg[0] == 't');
 155                return;
 156        }
 157
 158        if (strchr(arg, '%')) {
 159                save_user_format(rev, arg, 1);
 160                return;
 161        }
 162
 163        commit_format = find_commit_format(arg);
 164        if (!commit_format)
 165                die("invalid --pretty format: %s", arg);
 166
 167        rev->commit_format = commit_format->format;
 168        rev->use_terminator = commit_format->is_tformat;
 169        if (commit_format->format == CMIT_FMT_USERFORMAT) {
 170                save_user_format(rev, commit_format->user_format,
 171                                 commit_format->is_tformat);
 172        }
 173}
 174
 175/*
 176 * Generic support for pretty-printing the header
 177 */
 178static int get_one_line(const char *msg)
 179{
 180        int ret = 0;
 181
 182        for (;;) {
 183                char c = *msg++;
 184                if (!c)
 185                        break;
 186                ret++;
 187                if (c == '\n')
 188                        break;
 189        }
 190        return ret;
 191}
 192
 193/* High bit set, or ISO-2022-INT */
 194static int non_ascii(int ch)
 195{
 196        return !isascii(ch) || ch == '\033';
 197}
 198
 199int has_non_ascii(const char *s)
 200{
 201        int ch;
 202        if (!s)
 203                return 0;
 204        while ((ch = *s++) != '\0') {
 205                if (non_ascii(ch))
 206                        return 1;
 207        }
 208        return 0;
 209}
 210
 211static int is_rfc822_special(char ch)
 212{
 213        switch (ch) {
 214        case '(':
 215        case ')':
 216        case '<':
 217        case '>':
 218        case '[':
 219        case ']':
 220        case ':':
 221        case ';':
 222        case '@':
 223        case ',':
 224        case '.':
 225        case '"':
 226        case '\\':
 227                return 1;
 228        default:
 229                return 0;
 230        }
 231}
 232
 233static int has_rfc822_specials(const char *s, int len)
 234{
 235        int i;
 236        for (i = 0; i < len; i++)
 237                if (is_rfc822_special(s[i]))
 238                        return 1;
 239        return 0;
 240}
 241
 242static void add_rfc822_quoted(struct strbuf *out, const char *s, int len)
 243{
 244        int i;
 245
 246        /* just a guess, we may have to also backslash-quote */
 247        strbuf_grow(out, len + 2);
 248
 249        strbuf_addch(out, '"');
 250        for (i = 0; i < len; i++) {
 251                switch (s[i]) {
 252                case '"':
 253                case '\\':
 254                        strbuf_addch(out, '\\');
 255                        /* fall through */
 256                default:
 257                        strbuf_addch(out, s[i]);
 258                }
 259        }
 260        strbuf_addch(out, '"');
 261}
 262
 263static int is_rfc2047_special(char ch)
 264{
 265        return (non_ascii(ch) || (ch == '=') || (ch == '?') || (ch == '_'));
 266}
 267
 268static void add_rfc2047(struct strbuf *sb, const char *line, int len,
 269                       const char *encoding)
 270{
 271        static const int max_length = 78; /* per rfc2822 */
 272        int i;
 273        int line_len;
 274
 275        /* How many bytes are already used on the current line? */
 276        for (i = sb->len - 1; i >= 0; i--)
 277                if (sb->buf[i] == '\n')
 278                        break;
 279        line_len = sb->len - (i+1);
 280
 281        for (i = 0; i < len; i++) {
 282                int ch = line[i];
 283                if (non_ascii(ch) || ch == '\n')
 284                        goto needquote;
 285                if ((i + 1 < len) && (ch == '=' && line[i+1] == '?'))
 286                        goto needquote;
 287        }
 288        strbuf_add_wrapped_bytes(sb, line, len, 0, 1, max_length - line_len);
 289        return;
 290
 291needquote:
 292        strbuf_grow(sb, len * 3 + strlen(encoding) + 100);
 293        strbuf_addf(sb, "=?%s?q?", encoding);
 294        line_len += strlen(encoding) + 5; /* 5 for =??q? */
 295        for (i = 0; i < len; i++) {
 296                unsigned ch = line[i] & 0xFF;
 297
 298                if (line_len >= max_length - 2) {
 299                        strbuf_addf(sb, "?=\n =?%s?q?", encoding);
 300                        line_len = strlen(encoding) + 5 + 1; /* =??q? plus SP */
 301                }
 302
 303                /*
 304                 * We encode ' ' using '=20' even though rfc2047
 305                 * allows using '_' for readability.  Unfortunately,
 306                 * many programs do not understand this and just
 307                 * leave the underscore in place.
 308                 */
 309                if (is_rfc2047_special(ch) || ch == ' ' || ch == '\n') {
 310                        strbuf_addf(sb, "=%02X", ch);
 311                        line_len += 3;
 312                }
 313                else {
 314                        strbuf_addch(sb, ch);
 315                        line_len++;
 316                }
 317        }
 318        strbuf_addstr(sb, "?=");
 319}
 320
 321void pp_user_info(const struct pretty_print_context *pp,
 322                  const char *what, struct strbuf *sb,
 323                  const char *line, const char *encoding)
 324{
 325        char *date;
 326        int namelen;
 327        unsigned long time;
 328        int tz;
 329
 330        if (pp->fmt == CMIT_FMT_ONELINE)
 331                return;
 332        date = strchr(line, '>');
 333        if (!date)
 334                return;
 335        namelen = ++date - line;
 336        time = strtoul(date, &date, 10);
 337        tz = strtol(date, NULL, 10);
 338
 339        if (pp->fmt == CMIT_FMT_EMAIL) {
 340                char *name_tail = strchr(line, '<');
 341                int display_name_length;
 342                int final_line;
 343                if (!name_tail)
 344                        return;
 345                while (line < name_tail && isspace(name_tail[-1]))
 346                        name_tail--;
 347                display_name_length = name_tail - line;
 348                strbuf_addstr(sb, "From: ");
 349                if (!has_rfc822_specials(line, display_name_length)) {
 350                        add_rfc2047(sb, line, display_name_length, encoding);
 351                } else {
 352                        struct strbuf quoted = STRBUF_INIT;
 353                        add_rfc822_quoted(&quoted, line, display_name_length);
 354                        add_rfc2047(sb, quoted.buf, quoted.len, encoding);
 355                        strbuf_release(&quoted);
 356                }
 357                for (final_line = 0; final_line < sb->len; final_line++)
 358                        if (sb->buf[sb->len - final_line - 1] == '\n')
 359                                break;
 360                if (namelen - display_name_length + final_line > 78) {
 361                        strbuf_addch(sb, '\n');
 362                        if (!isspace(name_tail[0]))
 363                                strbuf_addch(sb, ' ');
 364                }
 365                strbuf_add(sb, name_tail, namelen - display_name_length);
 366                strbuf_addch(sb, '\n');
 367        } else {
 368                strbuf_addf(sb, "%s: %.*s%.*s\n", what,
 369                              (pp->fmt == CMIT_FMT_FULLER) ? 4 : 0,
 370                              "    ", namelen, line);
 371        }
 372        switch (pp->fmt) {
 373        case CMIT_FMT_MEDIUM:
 374                strbuf_addf(sb, "Date:   %s\n", show_date(time, tz, pp->date_mode));
 375                break;
 376        case CMIT_FMT_EMAIL:
 377                strbuf_addf(sb, "Date: %s\n", show_date(time, tz, DATE_RFC2822));
 378                break;
 379        case CMIT_FMT_FULLER:
 380                strbuf_addf(sb, "%sDate: %s\n", what, show_date(time, tz, pp->date_mode));
 381                break;
 382        default:
 383                /* notin' */
 384                break;
 385        }
 386}
 387
 388static int is_empty_line(const char *line, int *len_p)
 389{
 390        int len = *len_p;
 391        while (len && isspace(line[len-1]))
 392                len--;
 393        *len_p = len;
 394        return !len;
 395}
 396
 397static const char *skip_empty_lines(const char *msg)
 398{
 399        for (;;) {
 400                int linelen = get_one_line(msg);
 401                int ll = linelen;
 402                if (!linelen)
 403                        break;
 404                if (!is_empty_line(msg, &ll))
 405                        break;
 406                msg += linelen;
 407        }
 408        return msg;
 409}
 410
 411static void add_merge_info(const struct pretty_print_context *pp,
 412                           struct strbuf *sb, const struct commit *commit)
 413{
 414        struct commit_list *parent = commit->parents;
 415
 416        if ((pp->fmt == CMIT_FMT_ONELINE) || (pp->fmt == CMIT_FMT_EMAIL) ||
 417            !parent || !parent->next)
 418                return;
 419
 420        strbuf_addstr(sb, "Merge:");
 421
 422        while (parent) {
 423                struct commit *p = parent->item;
 424                const char *hex = NULL;
 425                if (pp->abbrev)
 426                        hex = find_unique_abbrev(p->object.sha1, pp->abbrev);
 427                if (!hex)
 428                        hex = sha1_to_hex(p->object.sha1);
 429                parent = parent->next;
 430
 431                strbuf_addf(sb, " %s", hex);
 432        }
 433        strbuf_addch(sb, '\n');
 434}
 435
 436static char *get_header(const struct commit *commit, const char *key)
 437{
 438        int key_len = strlen(key);
 439        const char *line = commit->buffer;
 440
 441        for (;;) {
 442                const char *eol = strchr(line, '\n'), *next;
 443
 444                if (line == eol)
 445                        return NULL;
 446                if (!eol) {
 447                        eol = line + strlen(line);
 448                        next = NULL;
 449                } else
 450                        next = eol + 1;
 451                if (eol - line > key_len &&
 452                    !strncmp(line, key, key_len) &&
 453                    line[key_len] == ' ') {
 454                        return xmemdupz(line + key_len + 1, eol - line - key_len - 1);
 455                }
 456                line = next;
 457        }
 458}
 459
 460static char *replace_encoding_header(char *buf, const char *encoding)
 461{
 462        struct strbuf tmp = STRBUF_INIT;
 463        size_t start, len;
 464        char *cp = buf;
 465
 466        /* guess if there is an encoding header before a \n\n */
 467        while (strncmp(cp, "encoding ", strlen("encoding "))) {
 468                cp = strchr(cp, '\n');
 469                if (!cp || *++cp == '\n')
 470                        return buf;
 471        }
 472        start = cp - buf;
 473        cp = strchr(cp, '\n');
 474        if (!cp)
 475                return buf; /* should not happen but be defensive */
 476        len = cp + 1 - (buf + start);
 477
 478        strbuf_attach(&tmp, buf, strlen(buf), strlen(buf) + 1);
 479        if (is_encoding_utf8(encoding)) {
 480                /* we have re-coded to UTF-8; drop the header */
 481                strbuf_remove(&tmp, start, len);
 482        } else {
 483                /* just replaces XXXX in 'encoding XXXX\n' */
 484                strbuf_splice(&tmp, start + strlen("encoding "),
 485                                          len - strlen("encoding \n"),
 486                                          encoding, strlen(encoding));
 487        }
 488        return strbuf_detach(&tmp, NULL);
 489}
 490
 491char *logmsg_reencode(const struct commit *commit,
 492                      const char *output_encoding)
 493{
 494        static const char *utf8 = "UTF-8";
 495        const char *use_encoding;
 496        char *encoding;
 497        char *out;
 498
 499        if (!*output_encoding)
 500                return NULL;
 501        encoding = get_header(commit, "encoding");
 502        use_encoding = encoding ? encoding : utf8;
 503        if (!strcmp(use_encoding, output_encoding))
 504                if (encoding) /* we'll strip encoding header later */
 505                        out = xstrdup(commit->buffer);
 506                else
 507                        return NULL; /* nothing to do */
 508        else
 509                out = reencode_string(commit->buffer,
 510                                      output_encoding, use_encoding);
 511        if (out)
 512                out = replace_encoding_header(out, output_encoding);
 513
 514        free(encoding);
 515        return out;
 516}
 517
 518static int mailmap_name(char *email, int email_len, char *name, int name_len)
 519{
 520        static struct string_list *mail_map;
 521        if (!mail_map) {
 522                mail_map = xcalloc(1, sizeof(*mail_map));
 523                read_mailmap(mail_map, NULL);
 524        }
 525        return mail_map->nr && map_user(mail_map, email, email_len, name, name_len);
 526}
 527
 528static size_t format_person_part(struct strbuf *sb, char part,
 529                                 const char *msg, int len, enum date_mode dmode)
 530{
 531        /* currently all placeholders have same length */
 532        const int placeholder_len = 2;
 533        int start, end, tz = 0;
 534        unsigned long date = 0;
 535        char *ep;
 536        const char *name_start, *name_end, *mail_start, *mail_end, *msg_end = msg+len;
 537        char person_name[1024];
 538        char person_mail[1024];
 539
 540        /* advance 'end' to point to email start delimiter */
 541        for (end = 0; end < len && msg[end] != '<'; end++)
 542                ; /* do nothing */
 543
 544        /*
 545         * When end points at the '<' that we found, it should have
 546         * matching '>' later, which means 'end' must be strictly
 547         * below len - 1.
 548         */
 549        if (end >= len - 2)
 550                goto skip;
 551
 552        /* Seek for both name and email part */
 553        name_start = msg;
 554        name_end = msg+end;
 555        while (name_end > name_start && isspace(*(name_end-1)))
 556                name_end--;
 557        mail_start = msg+end+1;
 558        mail_end = mail_start;
 559        while (mail_end < msg_end && *mail_end != '>')
 560                mail_end++;
 561        if (mail_end == msg_end)
 562                goto skip;
 563        end = mail_end-msg;
 564
 565        if (part == 'N' || part == 'E') { /* mailmap lookup */
 566                strlcpy(person_name, name_start, name_end-name_start+1);
 567                strlcpy(person_mail, mail_start, mail_end-mail_start+1);
 568                mailmap_name(person_mail, sizeof(person_mail), person_name, sizeof(person_name));
 569                name_start = person_name;
 570                name_end = name_start + strlen(person_name);
 571                mail_start = person_mail;
 572                mail_end = mail_start +  strlen(person_mail);
 573        }
 574        if (part == 'n' || part == 'N') {       /* name */
 575                strbuf_add(sb, name_start, name_end-name_start);
 576                return placeholder_len;
 577        }
 578        if (part == 'e' || part == 'E') {       /* email */
 579                strbuf_add(sb, mail_start, mail_end-mail_start);
 580                return placeholder_len;
 581        }
 582
 583        /* advance 'start' to point to date start delimiter */
 584        for (start = end + 1; start < len && isspace(msg[start]); start++)
 585                ; /* do nothing */
 586        if (start >= len)
 587                goto skip;
 588        date = strtoul(msg + start, &ep, 10);
 589        if (msg + start == ep)
 590                goto skip;
 591
 592        if (part == 't') {      /* date, UNIX timestamp */
 593                strbuf_add(sb, msg + start, ep - (msg + start));
 594                return placeholder_len;
 595        }
 596
 597        /* parse tz */
 598        for (start = ep - msg + 1; start < len && isspace(msg[start]); start++)
 599                ; /* do nothing */
 600        if (start + 1 < len) {
 601                tz = strtoul(msg + start + 1, NULL, 10);
 602                if (msg[start] == '-')
 603                        tz = -tz;
 604        }
 605
 606        switch (part) {
 607        case 'd':       /* date */
 608                strbuf_addstr(sb, show_date(date, tz, dmode));
 609                return placeholder_len;
 610        case 'D':       /* date, RFC2822 style */
 611                strbuf_addstr(sb, show_date(date, tz, DATE_RFC2822));
 612                return placeholder_len;
 613        case 'r':       /* date, relative */
 614                strbuf_addstr(sb, show_date(date, tz, DATE_RELATIVE));
 615                return placeholder_len;
 616        case 'i':       /* date, ISO 8601 */
 617                strbuf_addstr(sb, show_date(date, tz, DATE_ISO8601));
 618                return placeholder_len;
 619        }
 620
 621skip:
 622        /*
 623         * bogus commit, 'sb' cannot be updated, but we still need to
 624         * compute a valid return value.
 625         */
 626        if (part == 'n' || part == 'e' || part == 't' || part == 'd'
 627            || part == 'D' || part == 'r' || part == 'i')
 628                return placeholder_len;
 629
 630        return 0; /* unknown placeholder */
 631}
 632
 633struct chunk {
 634        size_t off;
 635        size_t len;
 636};
 637
 638struct format_commit_context {
 639        const struct commit *commit;
 640        const struct pretty_print_context *pretty_ctx;
 641        unsigned commit_header_parsed:1;
 642        unsigned commit_message_parsed:1;
 643        char *message;
 644        size_t width, indent1, indent2;
 645
 646        /* These offsets are relative to the start of the commit message. */
 647        struct chunk author;
 648        struct chunk committer;
 649        struct chunk encoding;
 650        size_t message_off;
 651        size_t subject_off;
 652        size_t body_off;
 653
 654        /* The following ones are relative to the result struct strbuf. */
 655        struct chunk abbrev_commit_hash;
 656        struct chunk abbrev_tree_hash;
 657        struct chunk abbrev_parent_hashes;
 658        size_t wrap_start;
 659};
 660
 661static int add_again(struct strbuf *sb, struct chunk *chunk)
 662{
 663        if (chunk->len) {
 664                strbuf_adddup(sb, chunk->off, chunk->len);
 665                return 1;
 666        }
 667
 668        /*
 669         * We haven't seen this chunk before.  Our caller is surely
 670         * going to add it the hard way now.  Remember the most likely
 671         * start of the to-be-added chunk: the current end of the
 672         * struct strbuf.
 673         */
 674        chunk->off = sb->len;
 675        return 0;
 676}
 677
 678static void parse_commit_header(struct format_commit_context *context)
 679{
 680        const char *msg = context->message;
 681        int i;
 682
 683        for (i = 0; msg[i]; i++) {
 684                int eol;
 685                for (eol = i; msg[eol] && msg[eol] != '\n'; eol++)
 686                        ; /* do nothing */
 687
 688                if (i == eol) {
 689                        break;
 690                } else if (!prefixcmp(msg + i, "author ")) {
 691                        context->author.off = i + 7;
 692                        context->author.len = eol - i - 7;
 693                } else if (!prefixcmp(msg + i, "committer ")) {
 694                        context->committer.off = i + 10;
 695                        context->committer.len = eol - i - 10;
 696                } else if (!prefixcmp(msg + i, "encoding ")) {
 697                        context->encoding.off = i + 9;
 698                        context->encoding.len = eol - i - 9;
 699                }
 700                i = eol;
 701        }
 702        context->message_off = i;
 703        context->commit_header_parsed = 1;
 704}
 705
 706static int istitlechar(char c)
 707{
 708        return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') ||
 709                (c >= '0' && c <= '9') || c == '.' || c == '_';
 710}
 711
 712static void format_sanitized_subject(struct strbuf *sb, const char *msg)
 713{
 714        size_t trimlen;
 715        size_t start_len = sb->len;
 716        int space = 2;
 717
 718        for (; *msg && *msg != '\n'; msg++) {
 719                if (istitlechar(*msg)) {
 720                        if (space == 1)
 721                                strbuf_addch(sb, '-');
 722                        space = 0;
 723                        strbuf_addch(sb, *msg);
 724                        if (*msg == '.')
 725                                while (*(msg+1) == '.')
 726                                        msg++;
 727                } else
 728                        space |= 1;
 729        }
 730
 731        /* trim any trailing '.' or '-' characters */
 732        trimlen = 0;
 733        while (sb->len - trimlen > start_len &&
 734                (sb->buf[sb->len - 1 - trimlen] == '.'
 735                || sb->buf[sb->len - 1 - trimlen] == '-'))
 736                trimlen++;
 737        strbuf_remove(sb, sb->len - trimlen, trimlen);
 738}
 739
 740const char *format_subject(struct strbuf *sb, const char *msg,
 741                           const char *line_separator)
 742{
 743        int first = 1;
 744
 745        for (;;) {
 746                const char *line = msg;
 747                int linelen = get_one_line(line);
 748
 749                msg += linelen;
 750                if (!linelen || is_empty_line(line, &linelen))
 751                        break;
 752
 753                if (!sb)
 754                        continue;
 755                strbuf_grow(sb, linelen + 2);
 756                if (!first)
 757                        strbuf_addstr(sb, line_separator);
 758                strbuf_add(sb, line, linelen);
 759                first = 0;
 760        }
 761        return msg;
 762}
 763
 764static void parse_commit_message(struct format_commit_context *c)
 765{
 766        const char *msg = c->message + c->message_off;
 767        const char *start = c->message;
 768
 769        msg = skip_empty_lines(msg);
 770        c->subject_off = msg - start;
 771
 772        msg = format_subject(NULL, msg, NULL);
 773        msg = skip_empty_lines(msg);
 774        c->body_off = msg - start;
 775
 776        c->commit_message_parsed = 1;
 777}
 778
 779static void format_decoration(struct strbuf *sb, const struct commit *commit)
 780{
 781        struct name_decoration *d;
 782        const char *prefix = " (";
 783
 784        load_ref_decorations(DECORATE_SHORT_REFS);
 785        d = lookup_decoration(&name_decoration, &commit->object);
 786        while (d) {
 787                strbuf_addstr(sb, prefix);
 788                prefix = ", ";
 789                strbuf_addstr(sb, d->name);
 790                d = d->next;
 791        }
 792        if (prefix[0] == ',')
 793                strbuf_addch(sb, ')');
 794}
 795
 796static void strbuf_wrap(struct strbuf *sb, size_t pos,
 797                        size_t width, size_t indent1, size_t indent2)
 798{
 799        struct strbuf tmp = STRBUF_INIT;
 800
 801        if (pos)
 802                strbuf_add(&tmp, sb->buf, pos);
 803        strbuf_add_wrapped_text(&tmp, sb->buf + pos,
 804                                (int) indent1, (int) indent2, (int) width);
 805        strbuf_swap(&tmp, sb);
 806        strbuf_release(&tmp);
 807}
 808
 809static void rewrap_message_tail(struct strbuf *sb,
 810                                struct format_commit_context *c,
 811                                size_t new_width, size_t new_indent1,
 812                                size_t new_indent2)
 813{
 814        if (c->width == new_width && c->indent1 == new_indent1 &&
 815            c->indent2 == new_indent2)
 816                return;
 817        if (c->wrap_start < sb->len)
 818                strbuf_wrap(sb, c->wrap_start, c->width, c->indent1, c->indent2);
 819        c->wrap_start = sb->len;
 820        c->width = new_width;
 821        c->indent1 = new_indent1;
 822        c->indent2 = new_indent2;
 823}
 824
 825static size_t format_commit_one(struct strbuf *sb, const char *placeholder,
 826                                void *context)
 827{
 828        struct format_commit_context *c = context;
 829        const struct commit *commit = c->commit;
 830        const char *msg = c->message;
 831        struct commit_list *p;
 832        int h1, h2;
 833
 834        /* these are independent of the commit */
 835        switch (placeholder[0]) {
 836        case 'C':
 837                if (placeholder[1] == '(') {
 838                        const char *end = strchr(placeholder + 2, ')');
 839                        char color[COLOR_MAXLEN];
 840                        if (!end)
 841                                return 0;
 842                        color_parse_mem(placeholder + 2,
 843                                        end - (placeholder + 2),
 844                                        "--pretty format", color);
 845                        strbuf_addstr(sb, color);
 846                        return end - placeholder + 1;
 847                }
 848                if (!prefixcmp(placeholder + 1, "red")) {
 849                        strbuf_addstr(sb, GIT_COLOR_RED);
 850                        return 4;
 851                } else if (!prefixcmp(placeholder + 1, "green")) {
 852                        strbuf_addstr(sb, GIT_COLOR_GREEN);
 853                        return 6;
 854                } else if (!prefixcmp(placeholder + 1, "blue")) {
 855                        strbuf_addstr(sb, GIT_COLOR_BLUE);
 856                        return 5;
 857                } else if (!prefixcmp(placeholder + 1, "reset")) {
 858                        strbuf_addstr(sb, GIT_COLOR_RESET);
 859                        return 6;
 860                } else
 861                        return 0;
 862        case 'n':               /* newline */
 863                strbuf_addch(sb, '\n');
 864                return 1;
 865        case 'x':
 866                /* %x00 == NUL, %x0a == LF, etc. */
 867                if (0 <= (h1 = hexval_table[0xff & placeholder[1]]) &&
 868                    h1 <= 16 &&
 869                    0 <= (h2 = hexval_table[0xff & placeholder[2]]) &&
 870                    h2 <= 16) {
 871                        strbuf_addch(sb, (h1<<4)|h2);
 872                        return 3;
 873                } else
 874                        return 0;
 875        case 'w':
 876                if (placeholder[1] == '(') {
 877                        unsigned long width = 0, indent1 = 0, indent2 = 0;
 878                        char *next;
 879                        const char *start = placeholder + 2;
 880                        const char *end = strchr(start, ')');
 881                        if (!end)
 882                                return 0;
 883                        if (end > start) {
 884                                width = strtoul(start, &next, 10);
 885                                if (*next == ',') {
 886                                        indent1 = strtoul(next + 1, &next, 10);
 887                                        if (*next == ',') {
 888                                                indent2 = strtoul(next + 1,
 889                                                                 &next, 10);
 890                                        }
 891                                }
 892                                if (*next != ')')
 893                                        return 0;
 894                        }
 895                        rewrap_message_tail(sb, c, width, indent1, indent2);
 896                        return end - placeholder + 1;
 897                } else
 898                        return 0;
 899        }
 900
 901        /* these depend on the commit */
 902        if (!commit->object.parsed)
 903                parse_object(commit->object.sha1);
 904
 905        switch (placeholder[0]) {
 906        case 'H':               /* commit hash */
 907                strbuf_addstr(sb, sha1_to_hex(commit->object.sha1));
 908                return 1;
 909        case 'h':               /* abbreviated commit hash */
 910                if (add_again(sb, &c->abbrev_commit_hash))
 911                        return 1;
 912                strbuf_addstr(sb, find_unique_abbrev(commit->object.sha1,
 913                                                     c->pretty_ctx->abbrev));
 914                c->abbrev_commit_hash.len = sb->len - c->abbrev_commit_hash.off;
 915                return 1;
 916        case 'T':               /* tree hash */
 917                strbuf_addstr(sb, sha1_to_hex(commit->tree->object.sha1));
 918                return 1;
 919        case 't':               /* abbreviated tree hash */
 920                if (add_again(sb, &c->abbrev_tree_hash))
 921                        return 1;
 922                strbuf_addstr(sb, find_unique_abbrev(commit->tree->object.sha1,
 923                                                     c->pretty_ctx->abbrev));
 924                c->abbrev_tree_hash.len = sb->len - c->abbrev_tree_hash.off;
 925                return 1;
 926        case 'P':               /* parent hashes */
 927                for (p = commit->parents; p; p = p->next) {
 928                        if (p != commit->parents)
 929                                strbuf_addch(sb, ' ');
 930                        strbuf_addstr(sb, sha1_to_hex(p->item->object.sha1));
 931                }
 932                return 1;
 933        case 'p':               /* abbreviated parent hashes */
 934                if (add_again(sb, &c->abbrev_parent_hashes))
 935                        return 1;
 936                for (p = commit->parents; p; p = p->next) {
 937                        if (p != commit->parents)
 938                                strbuf_addch(sb, ' ');
 939                        strbuf_addstr(sb, find_unique_abbrev(
 940                                        p->item->object.sha1,
 941                                        c->pretty_ctx->abbrev));
 942                }
 943                c->abbrev_parent_hashes.len = sb->len -
 944                                              c->abbrev_parent_hashes.off;
 945                return 1;
 946        case 'm':               /* left/right/bottom */
 947                strbuf_addstr(sb, get_revision_mark(NULL, commit));
 948                return 1;
 949        case 'd':
 950                format_decoration(sb, commit);
 951                return 1;
 952        case 'g':               /* reflog info */
 953                switch(placeholder[1]) {
 954                case 'd':       /* reflog selector */
 955                case 'D':
 956                        if (c->pretty_ctx->reflog_info)
 957                                get_reflog_selector(sb,
 958                                                    c->pretty_ctx->reflog_info,
 959                                                    c->pretty_ctx->date_mode,
 960                                                    (placeholder[1] == 'd'));
 961                        return 2;
 962                case 's':       /* reflog message */
 963                        if (c->pretty_ctx->reflog_info)
 964                                get_reflog_message(sb, c->pretty_ctx->reflog_info);
 965                        return 2;
 966                }
 967                return 0;       /* unknown %g placeholder */
 968        case 'N':
 969                if (c->pretty_ctx->show_notes) {
 970                        format_display_notes(commit->object.sha1, sb,
 971                                    get_log_output_encoding(), 0);
 972                        return 1;
 973                }
 974                return 0;
 975        }
 976
 977        /* For the rest we have to parse the commit header. */
 978        if (!c->commit_header_parsed)
 979                parse_commit_header(c);
 980
 981        switch (placeholder[0]) {
 982        case 'a':       /* author ... */
 983                return format_person_part(sb, placeholder[1],
 984                                   msg + c->author.off, c->author.len,
 985                                   c->pretty_ctx->date_mode);
 986        case 'c':       /* committer ... */
 987                return format_person_part(sb, placeholder[1],
 988                                   msg + c->committer.off, c->committer.len,
 989                                   c->pretty_ctx->date_mode);
 990        case 'e':       /* encoding */
 991                strbuf_add(sb, msg + c->encoding.off, c->encoding.len);
 992                return 1;
 993        case 'B':       /* raw body */
 994                /* message_off is always left at the initial newline */
 995                strbuf_addstr(sb, msg + c->message_off + 1);
 996                return 1;
 997        }
 998
 999        /* Now we need to parse the commit message. */
1000        if (!c->commit_message_parsed)
1001                parse_commit_message(c);
1002
1003        switch (placeholder[0]) {
1004        case 's':       /* subject */
1005                format_subject(sb, msg + c->subject_off, " ");
1006                return 1;
1007        case 'f':       /* sanitized subject */
1008                format_sanitized_subject(sb, msg + c->subject_off);
1009                return 1;
1010        case 'b':       /* body */
1011                strbuf_addstr(sb, msg + c->body_off);
1012                return 1;
1013        }
1014        return 0;       /* unknown placeholder */
1015}
1016
1017static size_t format_commit_item(struct strbuf *sb, const char *placeholder,
1018                                 void *context)
1019{
1020        int consumed;
1021        size_t orig_len;
1022        enum {
1023                NO_MAGIC,
1024                ADD_LF_BEFORE_NON_EMPTY,
1025                DEL_LF_BEFORE_EMPTY,
1026                ADD_SP_BEFORE_NON_EMPTY
1027        } magic = NO_MAGIC;
1028
1029        switch (placeholder[0]) {
1030        case '-':
1031                magic = DEL_LF_BEFORE_EMPTY;
1032                break;
1033        case '+':
1034                magic = ADD_LF_BEFORE_NON_EMPTY;
1035                break;
1036        case ' ':
1037                magic = ADD_SP_BEFORE_NON_EMPTY;
1038                break;
1039        default:
1040                break;
1041        }
1042        if (magic != NO_MAGIC)
1043                placeholder++;
1044
1045        orig_len = sb->len;
1046        consumed = format_commit_one(sb, placeholder, context);
1047        if (magic == NO_MAGIC)
1048                return consumed;
1049
1050        if ((orig_len == sb->len) && magic == DEL_LF_BEFORE_EMPTY) {
1051                while (sb->len && sb->buf[sb->len - 1] == '\n')
1052                        strbuf_setlen(sb, sb->len - 1);
1053        } else if (orig_len != sb->len) {
1054                if (magic == ADD_LF_BEFORE_NON_EMPTY)
1055                        strbuf_insert(sb, orig_len, "\n", 1);
1056                else if (magic == ADD_SP_BEFORE_NON_EMPTY)
1057                        strbuf_insert(sb, orig_len, " ", 1);
1058        }
1059        return consumed + 1;
1060}
1061
1062static size_t userformat_want_item(struct strbuf *sb, const char *placeholder,
1063                                   void *context)
1064{
1065        struct userformat_want *w = context;
1066
1067        if (*placeholder == '+' || *placeholder == '-' || *placeholder == ' ')
1068                placeholder++;
1069
1070        switch (*placeholder) {
1071        case 'N':
1072                w->notes = 1;
1073                break;
1074        }
1075        return 0;
1076}
1077
1078void userformat_find_requirements(const char *fmt, struct userformat_want *w)
1079{
1080        struct strbuf dummy = STRBUF_INIT;
1081
1082        if (!fmt) {
1083                if (!user_format)
1084                        return;
1085                fmt = user_format;
1086        }
1087        strbuf_expand(&dummy, fmt, userformat_want_item, w);
1088        strbuf_release(&dummy);
1089}
1090
1091void format_commit_message(const struct commit *commit,
1092                           const char *format, struct strbuf *sb,
1093                           const struct pretty_print_context *pretty_ctx)
1094{
1095        struct format_commit_context context;
1096        static const char utf8[] = "UTF-8";
1097        const char *enc;
1098        const char *output_enc = pretty_ctx->output_encoding;
1099
1100        memset(&context, 0, sizeof(context));
1101        context.commit = commit;
1102        context.pretty_ctx = pretty_ctx;
1103        context.wrap_start = sb->len;
1104        context.message = commit->buffer;
1105        if (output_enc) {
1106                enc = get_header(commit, "encoding");
1107                enc = enc ? enc : utf8;
1108                if (strcmp(enc, output_enc))
1109                        context.message = logmsg_reencode(commit, output_enc);
1110        }
1111
1112        strbuf_expand(sb, format, format_commit_item, &context);
1113        rewrap_message_tail(sb, &context, 0, 0, 0);
1114
1115        if (context.message != commit->buffer)
1116                free(context.message);
1117}
1118
1119static void pp_header(const struct pretty_print_context *pp,
1120                      const char *encoding,
1121                      const struct commit *commit,
1122                      const char **msg_p,
1123                      struct strbuf *sb)
1124{
1125        int parents_shown = 0;
1126
1127        for (;;) {
1128                const char *line = *msg_p;
1129                int linelen = get_one_line(*msg_p);
1130
1131                if (!linelen)
1132                        return;
1133                *msg_p += linelen;
1134
1135                if (linelen == 1)
1136                        /* End of header */
1137                        return;
1138
1139                if (pp->fmt == CMIT_FMT_RAW) {
1140                        strbuf_add(sb, line, linelen);
1141                        continue;
1142                }
1143
1144                if (!memcmp(line, "parent ", 7)) {
1145                        if (linelen != 48)
1146                                die("bad parent line in commit");
1147                        continue;
1148                }
1149
1150                if (!parents_shown) {
1151                        struct commit_list *parent;
1152                        int num;
1153                        for (parent = commit->parents, num = 0;
1154                             parent;
1155                             parent = parent->next, num++)
1156                                ;
1157                        /* with enough slop */
1158                        strbuf_grow(sb, num * 50 + 20);
1159                        add_merge_info(pp, sb, commit);
1160                        parents_shown = 1;
1161                }
1162
1163                /*
1164                 * MEDIUM == DEFAULT shows only author with dates.
1165                 * FULL shows both authors but not dates.
1166                 * FULLER shows both authors and dates.
1167                 */
1168                if (!memcmp(line, "author ", 7)) {
1169                        strbuf_grow(sb, linelen + 80);
1170                        pp_user_info(pp, "Author", sb, line + 7, encoding);
1171                }
1172                if (!memcmp(line, "committer ", 10) &&
1173                    (pp->fmt == CMIT_FMT_FULL || pp->fmt == CMIT_FMT_FULLER)) {
1174                        strbuf_grow(sb, linelen + 80);
1175                        pp_user_info(pp, "Commit", sb, line + 10, encoding);
1176                }
1177        }
1178}
1179
1180void pp_title_line(const struct pretty_print_context *pp,
1181                   const char **msg_p,
1182                   struct strbuf *sb,
1183                   const char *encoding,
1184                   int need_8bit_cte)
1185{
1186        struct strbuf title;
1187
1188        strbuf_init(&title, 80);
1189        *msg_p = format_subject(&title, *msg_p,
1190                                pp->preserve_subject ? "\n" : " ");
1191
1192        strbuf_grow(sb, title.len + 1024);
1193        if (pp->subject) {
1194                strbuf_addstr(sb, pp->subject);
1195                add_rfc2047(sb, title.buf, title.len, encoding);
1196        } else {
1197                strbuf_addbuf(sb, &title);
1198        }
1199        strbuf_addch(sb, '\n');
1200
1201        if (need_8bit_cte > 0) {
1202                const char *header_fmt =
1203                        "MIME-Version: 1.0\n"
1204                        "Content-Type: text/plain; charset=%s\n"
1205                        "Content-Transfer-Encoding: 8bit\n";
1206                strbuf_addf(sb, header_fmt, encoding);
1207        }
1208        if (pp->after_subject) {
1209                strbuf_addstr(sb, pp->after_subject);
1210        }
1211        if (pp->fmt == CMIT_FMT_EMAIL) {
1212                strbuf_addch(sb, '\n');
1213        }
1214        strbuf_release(&title);
1215}
1216
1217void pp_remainder(const struct pretty_print_context *pp,
1218                  const char **msg_p,
1219                  struct strbuf *sb,
1220                  int indent)
1221{
1222        int first = 1;
1223        for (;;) {
1224                const char *line = *msg_p;
1225                int linelen = get_one_line(line);
1226                *msg_p += linelen;
1227
1228                if (!linelen)
1229                        break;
1230
1231                if (is_empty_line(line, &linelen)) {
1232                        if (first)
1233                                continue;
1234                        if (pp->fmt == CMIT_FMT_SHORT)
1235                                break;
1236                }
1237                first = 0;
1238
1239                strbuf_grow(sb, linelen + indent + 20);
1240                if (indent) {
1241                        memset(sb->buf + sb->len, ' ', indent);
1242                        strbuf_setlen(sb, sb->len + indent);
1243                }
1244                strbuf_add(sb, line, linelen);
1245                strbuf_addch(sb, '\n');
1246        }
1247}
1248
1249char *reencode_commit_message(const struct commit *commit, const char **encoding_p)
1250{
1251        const char *encoding;
1252
1253        encoding = get_log_output_encoding();
1254        if (encoding_p)
1255                *encoding_p = encoding;
1256        return logmsg_reencode(commit, encoding);
1257}
1258
1259void pretty_print_commit(const struct pretty_print_context *pp,
1260                         const struct commit *commit,
1261                         struct strbuf *sb)
1262{
1263        unsigned long beginning_of_body;
1264        int indent = 4;
1265        const char *msg = commit->buffer;
1266        char *reencoded;
1267        const char *encoding;
1268        int need_8bit_cte = pp->need_8bit_cte;
1269
1270        if (pp->fmt == CMIT_FMT_USERFORMAT) {
1271                format_commit_message(commit, user_format, sb, pp);
1272                return;
1273        }
1274
1275        reencoded = reencode_commit_message(commit, &encoding);
1276        if (reencoded) {
1277                msg = reencoded;
1278        }
1279
1280        if (pp->fmt == CMIT_FMT_ONELINE || pp->fmt == CMIT_FMT_EMAIL)
1281                indent = 0;
1282
1283        /*
1284         * We need to check and emit Content-type: to mark it
1285         * as 8-bit if we haven't done so.
1286         */
1287        if (pp->fmt == CMIT_FMT_EMAIL && need_8bit_cte == 0) {
1288                int i, ch, in_body;
1289
1290                for (in_body = i = 0; (ch = msg[i]); i++) {
1291                        if (!in_body) {
1292                                /* author could be non 7-bit ASCII but
1293                                 * the log may be so; skip over the
1294                                 * header part first.
1295                                 */
1296                                if (ch == '\n' && msg[i+1] == '\n')
1297                                        in_body = 1;
1298                        }
1299                        else if (non_ascii(ch)) {
1300                                need_8bit_cte = 1;
1301                                break;
1302                        }
1303                }
1304        }
1305
1306        pp_header(pp, encoding, commit, &msg, sb);
1307        if (pp->fmt != CMIT_FMT_ONELINE && !pp->subject) {
1308                strbuf_addch(sb, '\n');
1309        }
1310
1311        /* Skip excess blank lines at the beginning of body, if any... */
1312        msg = skip_empty_lines(msg);
1313
1314        /* These formats treat the title line specially. */
1315        if (pp->fmt == CMIT_FMT_ONELINE || pp->fmt == CMIT_FMT_EMAIL)
1316                pp_title_line(pp, &msg, sb, encoding, need_8bit_cte);
1317
1318        beginning_of_body = sb->len;
1319        if (pp->fmt != CMIT_FMT_ONELINE)
1320                pp_remainder(pp, &msg, sb, indent);
1321        strbuf_rtrim(sb);
1322
1323        /* Make sure there is an EOLN for the non-oneline case */
1324        if (pp->fmt != CMIT_FMT_ONELINE)
1325                strbuf_addch(sb, '\n');
1326
1327        /*
1328         * The caller may append additional body text in e-mail
1329         * format.  Make sure we did not strip the blank line
1330         * between the header and the body.
1331         */
1332        if (pp->fmt == CMIT_FMT_EMAIL && sb->len <= beginning_of_body)
1333                strbuf_addch(sb, '\n');
1334
1335        if (pp->show_notes)
1336                format_display_notes(commit->object.sha1, sb, encoding,
1337                                     NOTES_SHOW_HEADER | NOTES_INDENT);
1338
1339        free(reencoded);
1340}
1341
1342void pp_commit_easy(enum cmit_fmt fmt, const struct commit *commit,
1343                    struct strbuf *sb)
1344{
1345        struct pretty_print_context pp = {0};
1346        pp.fmt = fmt;
1347        pretty_print_commit(&pp, commit, sb);
1348}