Andrew's git / gitweb.git / pretty.c
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pretty.con commit merge-recursive: Remember to free generated unique path names (3d6b8e8)
   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 char *what, enum cmit_fmt fmt, struct strbuf *sb,
 322                  const char *line, enum date_mode dmode,
 323                  const char *encoding)
 324{
 325        char *date;
 326        int namelen;
 327        unsigned long time;
 328        int tz;
 329
 330        if (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 (fmt == CMIT_FMT_EMAIL) {
 340                char *name_tail = strchr(line, '<');
 341                int display_name_length;
 342                if (!name_tail)
 343                        return;
 344                while (line < name_tail && isspace(name_tail[-1]))
 345                        name_tail--;
 346                display_name_length = name_tail - line;
 347                strbuf_addstr(sb, "From: ");
 348                if (!has_rfc822_specials(line, display_name_length)) {
 349                        add_rfc2047(sb, line, display_name_length, encoding);
 350                } else {
 351                        struct strbuf quoted = STRBUF_INIT;
 352                        add_rfc822_quoted(&quoted, line, display_name_length);
 353                        add_rfc2047(sb, quoted.buf, quoted.len, encoding);
 354                        strbuf_release(&quoted);
 355                }
 356                strbuf_add(sb, name_tail, namelen - display_name_length);
 357                strbuf_addch(sb, '\n');
 358        } else {
 359                strbuf_addf(sb, "%s: %.*s%.*s\n", what,
 360                              (fmt == CMIT_FMT_FULLER) ? 4 : 0,
 361                              "    ", namelen, line);
 362        }
 363        switch (fmt) {
 364        case CMIT_FMT_MEDIUM:
 365                strbuf_addf(sb, "Date:   %s\n", show_date(time, tz, dmode));
 366                break;
 367        case CMIT_FMT_EMAIL:
 368                strbuf_addf(sb, "Date: %s\n", show_date(time, tz, DATE_RFC2822));
 369                break;
 370        case CMIT_FMT_FULLER:
 371                strbuf_addf(sb, "%sDate: %s\n", what, show_date(time, tz, dmode));
 372                break;
 373        default:
 374                /* notin' */
 375                break;
 376        }
 377}
 378
 379static int is_empty_line(const char *line, int *len_p)
 380{
 381        int len = *len_p;
 382        while (len && isspace(line[len-1]))
 383                len--;
 384        *len_p = len;
 385        return !len;
 386}
 387
 388static const char *skip_empty_lines(const char *msg)
 389{
 390        for (;;) {
 391                int linelen = get_one_line(msg);
 392                int ll = linelen;
 393                if (!linelen)
 394                        break;
 395                if (!is_empty_line(msg, &ll))
 396                        break;
 397                msg += linelen;
 398        }
 399        return msg;
 400}
 401
 402static void add_merge_info(enum cmit_fmt fmt, struct strbuf *sb,
 403                        const struct commit *commit, int abbrev)
 404{
 405        struct commit_list *parent = commit->parents;
 406
 407        if ((fmt == CMIT_FMT_ONELINE) || (fmt == CMIT_FMT_EMAIL) ||
 408            !parent || !parent->next)
 409                return;
 410
 411        strbuf_addstr(sb, "Merge:");
 412
 413        while (parent) {
 414                struct commit *p = parent->item;
 415                const char *hex = NULL;
 416                if (abbrev)
 417                        hex = find_unique_abbrev(p->object.sha1, abbrev);
 418                if (!hex)
 419                        hex = sha1_to_hex(p->object.sha1);
 420                parent = parent->next;
 421
 422                strbuf_addf(sb, " %s", hex);
 423        }
 424        strbuf_addch(sb, '\n');
 425}
 426
 427static char *get_header(const struct commit *commit, const char *key)
 428{
 429        int key_len = strlen(key);
 430        const char *line = commit->buffer;
 431
 432        for (;;) {
 433                const char *eol = strchr(line, '\n'), *next;
 434
 435                if (line == eol)
 436                        return NULL;
 437                if (!eol) {
 438                        eol = line + strlen(line);
 439                        next = NULL;
 440                } else
 441                        next = eol + 1;
 442                if (eol - line > key_len &&
 443                    !strncmp(line, key, key_len) &&
 444                    line[key_len] == ' ') {
 445                        return xmemdupz(line + key_len + 1, eol - line - key_len - 1);
 446                }
 447                line = next;
 448        }
 449}
 450
 451static char *replace_encoding_header(char *buf, const char *encoding)
 452{
 453        struct strbuf tmp = STRBUF_INIT;
 454        size_t start, len;
 455        char *cp = buf;
 456
 457        /* guess if there is an encoding header before a \n\n */
 458        while (strncmp(cp, "encoding ", strlen("encoding "))) {
 459                cp = strchr(cp, '\n');
 460                if (!cp || *++cp == '\n')
 461                        return buf;
 462        }
 463        start = cp - buf;
 464        cp = strchr(cp, '\n');
 465        if (!cp)
 466                return buf; /* should not happen but be defensive */
 467        len = cp + 1 - (buf + start);
 468
 469        strbuf_attach(&tmp, buf, strlen(buf), strlen(buf) + 1);
 470        if (is_encoding_utf8(encoding)) {
 471                /* we have re-coded to UTF-8; drop the header */
 472                strbuf_remove(&tmp, start, len);
 473        } else {
 474                /* just replaces XXXX in 'encoding XXXX\n' */
 475                strbuf_splice(&tmp, start + strlen("encoding "),
 476                                          len - strlen("encoding \n"),
 477                                          encoding, strlen(encoding));
 478        }
 479        return strbuf_detach(&tmp, NULL);
 480}
 481
 482char *logmsg_reencode(const struct commit *commit,
 483                      const char *output_encoding)
 484{
 485        static const char *utf8 = "UTF-8";
 486        const char *use_encoding;
 487        char *encoding;
 488        char *out;
 489
 490        if (!*output_encoding)
 491                return NULL;
 492        encoding = get_header(commit, "encoding");
 493        use_encoding = encoding ? encoding : utf8;
 494        if (!strcmp(use_encoding, output_encoding))
 495                if (encoding) /* we'll strip encoding header later */
 496                        out = xstrdup(commit->buffer);
 497                else
 498                        return NULL; /* nothing to do */
 499        else
 500                out = reencode_string(commit->buffer,
 501                                      output_encoding, use_encoding);
 502        if (out)
 503                out = replace_encoding_header(out, output_encoding);
 504
 505        free(encoding);
 506        return out;
 507}
 508
 509static int mailmap_name(char *email, int email_len, char *name, int name_len)
 510{
 511        static struct string_list *mail_map;
 512        if (!mail_map) {
 513                mail_map = xcalloc(1, sizeof(*mail_map));
 514                read_mailmap(mail_map, NULL);
 515        }
 516        return mail_map->nr && map_user(mail_map, email, email_len, name, name_len);
 517}
 518
 519static size_t format_person_part(struct strbuf *sb, char part,
 520                                 const char *msg, int len, enum date_mode dmode)
 521{
 522        /* currently all placeholders have same length */
 523        const int placeholder_len = 2;
 524        int start, end, tz = 0;
 525        unsigned long date = 0;
 526        char *ep;
 527        const char *name_start, *name_end, *mail_start, *mail_end, *msg_end = msg+len;
 528        char person_name[1024];
 529        char person_mail[1024];
 530
 531        /* advance 'end' to point to email start delimiter */
 532        for (end = 0; end < len && msg[end] != '<'; end++)
 533                ; /* do nothing */
 534
 535        /*
 536         * When end points at the '<' that we found, it should have
 537         * matching '>' later, which means 'end' must be strictly
 538         * below len - 1.
 539         */
 540        if (end >= len - 2)
 541                goto skip;
 542
 543        /* Seek for both name and email part */
 544        name_start = msg;
 545        name_end = msg+end;
 546        while (name_end > name_start && isspace(*(name_end-1)))
 547                name_end--;
 548        mail_start = msg+end+1;
 549        mail_end = mail_start;
 550        while (mail_end < msg_end && *mail_end != '>')
 551                mail_end++;
 552        if (mail_end == msg_end)
 553                goto skip;
 554        end = mail_end-msg;
 555
 556        if (part == 'N' || part == 'E') { /* mailmap lookup */
 557                strlcpy(person_name, name_start, name_end-name_start+1);
 558                strlcpy(person_mail, mail_start, mail_end-mail_start+1);
 559                mailmap_name(person_mail, sizeof(person_mail), person_name, sizeof(person_name));
 560                name_start = person_name;
 561                name_end = name_start + strlen(person_name);
 562                mail_start = person_mail;
 563                mail_end = mail_start +  strlen(person_mail);
 564        }
 565        if (part == 'n' || part == 'N') {       /* name */
 566                strbuf_add(sb, name_start, name_end-name_start);
 567                return placeholder_len;
 568        }
 569        if (part == 'e' || part == 'E') {       /* email */
 570                strbuf_add(sb, mail_start, mail_end-mail_start);
 571                return placeholder_len;
 572        }
 573
 574        /* advance 'start' to point to date start delimiter */
 575        for (start = end + 1; start < len && isspace(msg[start]); start++)
 576                ; /* do nothing */
 577        if (start >= len)
 578                goto skip;
 579        date = strtoul(msg + start, &ep, 10);
 580        if (msg + start == ep)
 581                goto skip;
 582
 583        if (part == 't') {      /* date, UNIX timestamp */
 584                strbuf_add(sb, msg + start, ep - (msg + start));
 585                return placeholder_len;
 586        }
 587
 588        /* parse tz */
 589        for (start = ep - msg + 1; start < len && isspace(msg[start]); start++)
 590                ; /* do nothing */
 591        if (start + 1 < len) {
 592                tz = strtoul(msg + start + 1, NULL, 10);
 593                if (msg[start] == '-')
 594                        tz = -tz;
 595        }
 596
 597        switch (part) {
 598        case 'd':       /* date */
 599                strbuf_addstr(sb, show_date(date, tz, dmode));
 600                return placeholder_len;
 601        case 'D':       /* date, RFC2822 style */
 602                strbuf_addstr(sb, show_date(date, tz, DATE_RFC2822));
 603                return placeholder_len;
 604        case 'r':       /* date, relative */
 605                strbuf_addstr(sb, show_date(date, tz, DATE_RELATIVE));
 606                return placeholder_len;
 607        case 'i':       /* date, ISO 8601 */
 608                strbuf_addstr(sb, show_date(date, tz, DATE_ISO8601));
 609                return placeholder_len;
 610        }
 611
 612skip:
 613        /*
 614         * bogus commit, 'sb' cannot be updated, but we still need to
 615         * compute a valid return value.
 616         */
 617        if (part == 'n' || part == 'e' || part == 't' || part == 'd'
 618            || part == 'D' || part == 'r' || part == 'i')
 619                return placeholder_len;
 620
 621        return 0; /* unknown placeholder */
 622}
 623
 624struct chunk {
 625        size_t off;
 626        size_t len;
 627};
 628
 629struct format_commit_context {
 630        const struct commit *commit;
 631        const struct pretty_print_context *pretty_ctx;
 632        unsigned commit_header_parsed:1;
 633        unsigned commit_message_parsed:1;
 634        char *message;
 635        size_t width, indent1, indent2;
 636
 637        /* These offsets are relative to the start of the commit message. */
 638        struct chunk author;
 639        struct chunk committer;
 640        struct chunk encoding;
 641        size_t message_off;
 642        size_t subject_off;
 643        size_t body_off;
 644
 645        /* The following ones are relative to the result struct strbuf. */
 646        struct chunk abbrev_commit_hash;
 647        struct chunk abbrev_tree_hash;
 648        struct chunk abbrev_parent_hashes;
 649        size_t wrap_start;
 650};
 651
 652static int add_again(struct strbuf *sb, struct chunk *chunk)
 653{
 654        if (chunk->len) {
 655                strbuf_adddup(sb, chunk->off, chunk->len);
 656                return 1;
 657        }
 658
 659        /*
 660         * We haven't seen this chunk before.  Our caller is surely
 661         * going to add it the hard way now.  Remember the most likely
 662         * start of the to-be-added chunk: the current end of the
 663         * struct strbuf.
 664         */
 665        chunk->off = sb->len;
 666        return 0;
 667}
 668
 669static void parse_commit_header(struct format_commit_context *context)
 670{
 671        const char *msg = context->message;
 672        int i;
 673
 674        for (i = 0; msg[i]; i++) {
 675                int eol;
 676                for (eol = i; msg[eol] && msg[eol] != '\n'; eol++)
 677                        ; /* do nothing */
 678
 679                if (i == eol) {
 680                        break;
 681                } else if (!prefixcmp(msg + i, "author ")) {
 682                        context->author.off = i + 7;
 683                        context->author.len = eol - i - 7;
 684                } else if (!prefixcmp(msg + i, "committer ")) {
 685                        context->committer.off = i + 10;
 686                        context->committer.len = eol - i - 10;
 687                } else if (!prefixcmp(msg + i, "encoding ")) {
 688                        context->encoding.off = i + 9;
 689                        context->encoding.len = eol - i - 9;
 690                }
 691                i = eol;
 692        }
 693        context->message_off = i;
 694        context->commit_header_parsed = 1;
 695}
 696
 697static int istitlechar(char c)
 698{
 699        return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') ||
 700                (c >= '0' && c <= '9') || c == '.' || c == '_';
 701}
 702
 703static void format_sanitized_subject(struct strbuf *sb, const char *msg)
 704{
 705        size_t trimlen;
 706        size_t start_len = sb->len;
 707        int space = 2;
 708
 709        for (; *msg && *msg != '\n'; msg++) {
 710                if (istitlechar(*msg)) {
 711                        if (space == 1)
 712                                strbuf_addch(sb, '-');
 713                        space = 0;
 714                        strbuf_addch(sb, *msg);
 715                        if (*msg == '.')
 716                                while (*(msg+1) == '.')
 717                                        msg++;
 718                } else
 719                        space |= 1;
 720        }
 721
 722        /* trim any trailing '.' or '-' characters */
 723        trimlen = 0;
 724        while (sb->len - trimlen > start_len &&
 725                (sb->buf[sb->len - 1 - trimlen] == '.'
 726                || sb->buf[sb->len - 1 - trimlen] == '-'))
 727                trimlen++;
 728        strbuf_remove(sb, sb->len - trimlen, trimlen);
 729}
 730
 731const char *format_subject(struct strbuf *sb, const char *msg,
 732                           const char *line_separator)
 733{
 734        int first = 1;
 735
 736        for (;;) {
 737                const char *line = msg;
 738                int linelen = get_one_line(line);
 739
 740                msg += linelen;
 741                if (!linelen || is_empty_line(line, &linelen))
 742                        break;
 743
 744                if (!sb)
 745                        continue;
 746                strbuf_grow(sb, linelen + 2);
 747                if (!first)
 748                        strbuf_addstr(sb, line_separator);
 749                strbuf_add(sb, line, linelen);
 750                first = 0;
 751        }
 752        return msg;
 753}
 754
 755static void parse_commit_message(struct format_commit_context *c)
 756{
 757        const char *msg = c->message + c->message_off;
 758        const char *start = c->message;
 759
 760        msg = skip_empty_lines(msg);
 761        c->subject_off = msg - start;
 762
 763        msg = format_subject(NULL, msg, NULL);
 764        msg = skip_empty_lines(msg);
 765        c->body_off = msg - start;
 766
 767        c->commit_message_parsed = 1;
 768}
 769
 770static void format_decoration(struct strbuf *sb, const struct commit *commit)
 771{
 772        struct name_decoration *d;
 773        const char *prefix = " (";
 774
 775        load_ref_decorations(DECORATE_SHORT_REFS);
 776        d = lookup_decoration(&name_decoration, &commit->object);
 777        while (d) {
 778                strbuf_addstr(sb, prefix);
 779                prefix = ", ";
 780                strbuf_addstr(sb, d->name);
 781                d = d->next;
 782        }
 783        if (prefix[0] == ',')
 784                strbuf_addch(sb, ')');
 785}
 786
 787static void strbuf_wrap(struct strbuf *sb, size_t pos,
 788                        size_t width, size_t indent1, size_t indent2)
 789{
 790        struct strbuf tmp = STRBUF_INIT;
 791
 792        if (pos)
 793                strbuf_add(&tmp, sb->buf, pos);
 794        strbuf_add_wrapped_text(&tmp, sb->buf + pos,
 795                                (int) indent1, (int) indent2, (int) width);
 796        strbuf_swap(&tmp, sb);
 797        strbuf_release(&tmp);
 798}
 799
 800static void rewrap_message_tail(struct strbuf *sb,
 801                                struct format_commit_context *c,
 802                                size_t new_width, size_t new_indent1,
 803                                size_t new_indent2)
 804{
 805        if (c->width == new_width && c->indent1 == new_indent1 &&
 806            c->indent2 == new_indent2)
 807                return;
 808        if (c->wrap_start < sb->len)
 809                strbuf_wrap(sb, c->wrap_start, c->width, c->indent1, c->indent2);
 810        c->wrap_start = sb->len;
 811        c->width = new_width;
 812        c->indent1 = new_indent1;
 813        c->indent2 = new_indent2;
 814}
 815
 816static size_t format_commit_one(struct strbuf *sb, const char *placeholder,
 817                                void *context)
 818{
 819        struct format_commit_context *c = context;
 820        const struct commit *commit = c->commit;
 821        const char *msg = c->message;
 822        struct commit_list *p;
 823        int h1, h2;
 824
 825        /* these are independent of the commit */
 826        switch (placeholder[0]) {
 827        case 'C':
 828                if (placeholder[1] == '(') {
 829                        const char *end = strchr(placeholder + 2, ')');
 830                        char color[COLOR_MAXLEN];
 831                        if (!end)
 832                                return 0;
 833                        color_parse_mem(placeholder + 2,
 834                                        end - (placeholder + 2),
 835                                        "--pretty format", color);
 836                        strbuf_addstr(sb, color);
 837                        return end - placeholder + 1;
 838                }
 839                if (!prefixcmp(placeholder + 1, "red")) {
 840                        strbuf_addstr(sb, GIT_COLOR_RED);
 841                        return 4;
 842                } else if (!prefixcmp(placeholder + 1, "green")) {
 843                        strbuf_addstr(sb, GIT_COLOR_GREEN);
 844                        return 6;
 845                } else if (!prefixcmp(placeholder + 1, "blue")) {
 846                        strbuf_addstr(sb, GIT_COLOR_BLUE);
 847                        return 5;
 848                } else if (!prefixcmp(placeholder + 1, "reset")) {
 849                        strbuf_addstr(sb, GIT_COLOR_RESET);
 850                        return 6;
 851                } else
 852                        return 0;
 853        case 'n':               /* newline */
 854                strbuf_addch(sb, '\n');
 855                return 1;
 856        case 'x':
 857                /* %x00 == NUL, %x0a == LF, etc. */
 858                if (0 <= (h1 = hexval_table[0xff & placeholder[1]]) &&
 859                    h1 <= 16 &&
 860                    0 <= (h2 = hexval_table[0xff & placeholder[2]]) &&
 861                    h2 <= 16) {
 862                        strbuf_addch(sb, (h1<<4)|h2);
 863                        return 3;
 864                } else
 865                        return 0;
 866        case 'w':
 867                if (placeholder[1] == '(') {
 868                        unsigned long width = 0, indent1 = 0, indent2 = 0;
 869                        char *next;
 870                        const char *start = placeholder + 2;
 871                        const char *end = strchr(start, ')');
 872                        if (!end)
 873                                return 0;
 874                        if (end > start) {
 875                                width = strtoul(start, &next, 10);
 876                                if (*next == ',') {
 877                                        indent1 = strtoul(next + 1, &next, 10);
 878                                        if (*next == ',') {
 879                                                indent2 = strtoul(next + 1,
 880                                                                 &next, 10);
 881                                        }
 882                                }
 883                                if (*next != ')')
 884                                        return 0;
 885                        }
 886                        rewrap_message_tail(sb, c, width, indent1, indent2);
 887                        return end - placeholder + 1;
 888                } else
 889                        return 0;
 890        }
 891
 892        /* these depend on the commit */
 893        if (!commit->object.parsed)
 894                parse_object(commit->object.sha1);
 895
 896        switch (placeholder[0]) {
 897        case 'H':               /* commit hash */
 898                strbuf_addstr(sb, sha1_to_hex(commit->object.sha1));
 899                return 1;
 900        case 'h':               /* abbreviated commit hash */
 901                if (add_again(sb, &c->abbrev_commit_hash))
 902                        return 1;
 903                strbuf_addstr(sb, find_unique_abbrev(commit->object.sha1,
 904                                                     c->pretty_ctx->abbrev));
 905                c->abbrev_commit_hash.len = sb->len - c->abbrev_commit_hash.off;
 906                return 1;
 907        case 'T':               /* tree hash */
 908                strbuf_addstr(sb, sha1_to_hex(commit->tree->object.sha1));
 909                return 1;
 910        case 't':               /* abbreviated tree hash */
 911                if (add_again(sb, &c->abbrev_tree_hash))
 912                        return 1;
 913                strbuf_addstr(sb, find_unique_abbrev(commit->tree->object.sha1,
 914                                                     c->pretty_ctx->abbrev));
 915                c->abbrev_tree_hash.len = sb->len - c->abbrev_tree_hash.off;
 916                return 1;
 917        case 'P':               /* parent hashes */
 918                for (p = commit->parents; p; p = p->next) {
 919                        if (p != commit->parents)
 920                                strbuf_addch(sb, ' ');
 921                        strbuf_addstr(sb, sha1_to_hex(p->item->object.sha1));
 922                }
 923                return 1;
 924        case 'p':               /* abbreviated parent hashes */
 925                if (add_again(sb, &c->abbrev_parent_hashes))
 926                        return 1;
 927                for (p = commit->parents; p; p = p->next) {
 928                        if (p != commit->parents)
 929                                strbuf_addch(sb, ' ');
 930                        strbuf_addstr(sb, find_unique_abbrev(
 931                                        p->item->object.sha1,
 932                                        c->pretty_ctx->abbrev));
 933                }
 934                c->abbrev_parent_hashes.len = sb->len -
 935                                              c->abbrev_parent_hashes.off;
 936                return 1;
 937        case 'm':               /* left/right/bottom */
 938                strbuf_addstr(sb, get_revision_mark(NULL, commit));
 939                return 1;
 940        case 'd':
 941                format_decoration(sb, commit);
 942                return 1;
 943        case 'g':               /* reflog info */
 944                switch(placeholder[1]) {
 945                case 'd':       /* reflog selector */
 946                case 'D':
 947                        if (c->pretty_ctx->reflog_info)
 948                                get_reflog_selector(sb,
 949                                                    c->pretty_ctx->reflog_info,
 950                                                    c->pretty_ctx->date_mode,
 951                                                    (placeholder[1] == 'd'));
 952                        return 2;
 953                case 's':       /* reflog message */
 954                        if (c->pretty_ctx->reflog_info)
 955                                get_reflog_message(sb, c->pretty_ctx->reflog_info);
 956                        return 2;
 957                }
 958                return 0;       /* unknown %g placeholder */
 959        case 'N':
 960                if (c->pretty_ctx->show_notes) {
 961                        format_display_notes(commit->object.sha1, sb,
 962                                    get_log_output_encoding(), 0);
 963                        return 1;
 964                }
 965                return 0;
 966        }
 967
 968        /* For the rest we have to parse the commit header. */
 969        if (!c->commit_header_parsed)
 970                parse_commit_header(c);
 971
 972        switch (placeholder[0]) {
 973        case 'a':       /* author ... */
 974                return format_person_part(sb, placeholder[1],
 975                                   msg + c->author.off, c->author.len,
 976                                   c->pretty_ctx->date_mode);
 977        case 'c':       /* committer ... */
 978                return format_person_part(sb, placeholder[1],
 979                                   msg + c->committer.off, c->committer.len,
 980                                   c->pretty_ctx->date_mode);
 981        case 'e':       /* encoding */
 982                strbuf_add(sb, msg + c->encoding.off, c->encoding.len);
 983                return 1;
 984        case 'B':       /* raw body */
 985                /* message_off is always left at the initial newline */
 986                strbuf_addstr(sb, msg + c->message_off + 1);
 987                return 1;
 988        }
 989
 990        /* Now we need to parse the commit message. */
 991        if (!c->commit_message_parsed)
 992                parse_commit_message(c);
 993
 994        switch (placeholder[0]) {
 995        case 's':       /* subject */
 996                format_subject(sb, msg + c->subject_off, " ");
 997                return 1;
 998        case 'f':       /* sanitized subject */
 999                format_sanitized_subject(sb, msg + c->subject_off);
1000                return 1;
1001        case 'b':       /* body */
1002                strbuf_addstr(sb, msg + c->body_off);
1003                return 1;
1004        }
1005        return 0;       /* unknown placeholder */
1006}
1007
1008static size_t format_commit_item(struct strbuf *sb, const char *placeholder,
1009                                 void *context)
1010{
1011        int consumed;
1012        size_t orig_len;
1013        enum {
1014                NO_MAGIC,
1015                ADD_LF_BEFORE_NON_EMPTY,
1016                DEL_LF_BEFORE_EMPTY,
1017                ADD_SP_BEFORE_NON_EMPTY
1018        } magic = NO_MAGIC;
1019
1020        switch (placeholder[0]) {
1021        case '-':
1022                magic = DEL_LF_BEFORE_EMPTY;
1023                break;
1024        case '+':
1025                magic = ADD_LF_BEFORE_NON_EMPTY;
1026                break;
1027        case ' ':
1028                magic = ADD_SP_BEFORE_NON_EMPTY;
1029                break;
1030        default:
1031                break;
1032        }
1033        if (magic != NO_MAGIC)
1034                placeholder++;
1035
1036        orig_len = sb->len;
1037        consumed = format_commit_one(sb, placeholder, context);
1038        if (magic == NO_MAGIC)
1039                return consumed;
1040
1041        if ((orig_len == sb->len) && magic == DEL_LF_BEFORE_EMPTY) {
1042                while (sb->len && sb->buf[sb->len - 1] == '\n')
1043                        strbuf_setlen(sb, sb->len - 1);
1044        } else if (orig_len != sb->len) {
1045                if (magic == ADD_LF_BEFORE_NON_EMPTY)
1046                        strbuf_insert(sb, orig_len, "\n", 1);
1047                else if (magic == ADD_SP_BEFORE_NON_EMPTY)
1048                        strbuf_insert(sb, orig_len, " ", 1);
1049        }
1050        return consumed + 1;
1051}
1052
1053static size_t userformat_want_item(struct strbuf *sb, const char *placeholder,
1054                                   void *context)
1055{
1056        struct userformat_want *w = context;
1057
1058        if (*placeholder == '+' || *placeholder == '-' || *placeholder == ' ')
1059                placeholder++;
1060
1061        switch (*placeholder) {
1062        case 'N':
1063                w->notes = 1;
1064                break;
1065        }
1066        return 0;
1067}
1068
1069void userformat_find_requirements(const char *fmt, struct userformat_want *w)
1070{
1071        struct strbuf dummy = STRBUF_INIT;
1072
1073        if (!fmt) {
1074                if (!user_format)
1075                        return;
1076                fmt = user_format;
1077        }
1078        strbuf_expand(&dummy, fmt, userformat_want_item, w);
1079        strbuf_release(&dummy);
1080}
1081
1082void format_commit_message(const struct commit *commit,
1083                           const char *format, struct strbuf *sb,
1084                           const struct pretty_print_context *pretty_ctx)
1085{
1086        struct format_commit_context context;
1087        static const char utf8[] = "UTF-8";
1088        const char *enc;
1089        const char *output_enc = pretty_ctx->output_encoding;
1090
1091        memset(&context, 0, sizeof(context));
1092        context.commit = commit;
1093        context.pretty_ctx = pretty_ctx;
1094        context.wrap_start = sb->len;
1095        context.message = commit->buffer;
1096        if (output_enc) {
1097                enc = get_header(commit, "encoding");
1098                enc = enc ? enc : utf8;
1099                if (strcmp(enc, output_enc))
1100                        context.message = logmsg_reencode(commit, output_enc);
1101        }
1102
1103        strbuf_expand(sb, format, format_commit_item, &context);
1104        rewrap_message_tail(sb, &context, 0, 0, 0);
1105
1106        if (context.message != commit->buffer)
1107                free(context.message);
1108}
1109
1110static void pp_header(enum cmit_fmt fmt,
1111                      int abbrev,
1112                      enum date_mode dmode,
1113                      const char *encoding,
1114                      const struct commit *commit,
1115                      const char **msg_p,
1116                      struct strbuf *sb)
1117{
1118        int parents_shown = 0;
1119
1120        for (;;) {
1121                const char *line = *msg_p;
1122                int linelen = get_one_line(*msg_p);
1123
1124                if (!linelen)
1125                        return;
1126                *msg_p += linelen;
1127
1128                if (linelen == 1)
1129                        /* End of header */
1130                        return;
1131
1132                if (fmt == CMIT_FMT_RAW) {
1133                        strbuf_add(sb, line, linelen);
1134                        continue;
1135                }
1136
1137                if (!memcmp(line, "parent ", 7)) {
1138                        if (linelen != 48)
1139                                die("bad parent line in commit");
1140                        continue;
1141                }
1142
1143                if (!parents_shown) {
1144                        struct commit_list *parent;
1145                        int num;
1146                        for (parent = commit->parents, num = 0;
1147                             parent;
1148                             parent = parent->next, num++)
1149                                ;
1150                        /* with enough slop */
1151                        strbuf_grow(sb, num * 50 + 20);
1152                        add_merge_info(fmt, sb, commit, abbrev);
1153                        parents_shown = 1;
1154                }
1155
1156                /*
1157                 * MEDIUM == DEFAULT shows only author with dates.
1158                 * FULL shows both authors but not dates.
1159                 * FULLER shows both authors and dates.
1160                 */
1161                if (!memcmp(line, "author ", 7)) {
1162                        strbuf_grow(sb, linelen + 80);
1163                        pp_user_info("Author", fmt, sb, line + 7, dmode, encoding);
1164                }
1165                if (!memcmp(line, "committer ", 10) &&
1166                    (fmt == CMIT_FMT_FULL || fmt == CMIT_FMT_FULLER)) {
1167                        strbuf_grow(sb, linelen + 80);
1168                        pp_user_info("Commit", fmt, sb, line + 10, dmode, encoding);
1169                }
1170        }
1171}
1172
1173void pp_title_line(enum cmit_fmt fmt,
1174                   const char **msg_p,
1175                   struct strbuf *sb,
1176                   const char *subject,
1177                   const char *after_subject,
1178                   const char *encoding,
1179                   int need_8bit_cte)
1180{
1181        struct strbuf title;
1182
1183        strbuf_init(&title, 80);
1184        *msg_p = format_subject(&title, *msg_p, " ");
1185
1186        strbuf_grow(sb, title.len + 1024);
1187        if (subject) {
1188                strbuf_addstr(sb, subject);
1189                add_rfc2047(sb, title.buf, title.len, encoding);
1190        } else {
1191                strbuf_addbuf(sb, &title);
1192        }
1193        strbuf_addch(sb, '\n');
1194
1195        if (need_8bit_cte > 0) {
1196                const char *header_fmt =
1197                        "MIME-Version: 1.0\n"
1198                        "Content-Type: text/plain; charset=%s\n"
1199                        "Content-Transfer-Encoding: 8bit\n";
1200                strbuf_addf(sb, header_fmt, encoding);
1201        }
1202        if (after_subject) {
1203                strbuf_addstr(sb, after_subject);
1204        }
1205        if (fmt == CMIT_FMT_EMAIL) {
1206                strbuf_addch(sb, '\n');
1207        }
1208        strbuf_release(&title);
1209}
1210
1211void pp_remainder(enum cmit_fmt fmt,
1212                  const char **msg_p,
1213                  struct strbuf *sb,
1214                  int indent)
1215{
1216        int first = 1;
1217        for (;;) {
1218                const char *line = *msg_p;
1219                int linelen = get_one_line(line);
1220                *msg_p += linelen;
1221
1222                if (!linelen)
1223                        break;
1224
1225                if (is_empty_line(line, &linelen)) {
1226                        if (first)
1227                                continue;
1228                        if (fmt == CMIT_FMT_SHORT)
1229                                break;
1230                }
1231                first = 0;
1232
1233                strbuf_grow(sb, linelen + indent + 20);
1234                if (indent) {
1235                        memset(sb->buf + sb->len, ' ', indent);
1236                        strbuf_setlen(sb, sb->len + indent);
1237                }
1238                strbuf_add(sb, line, linelen);
1239                strbuf_addch(sb, '\n');
1240        }
1241}
1242
1243char *reencode_commit_message(const struct commit *commit, const char **encoding_p)
1244{
1245        const char *encoding;
1246
1247        encoding = get_log_output_encoding();
1248        if (encoding_p)
1249                *encoding_p = encoding;
1250        return logmsg_reencode(commit, encoding);
1251}
1252
1253void pretty_print_commit(enum cmit_fmt fmt, const struct commit *commit,
1254                         struct strbuf *sb,
1255                         const struct pretty_print_context *context)
1256{
1257        unsigned long beginning_of_body;
1258        int indent = 4;
1259        const char *msg = commit->buffer;
1260        char *reencoded;
1261        const char *encoding;
1262        int need_8bit_cte = context->need_8bit_cte;
1263
1264        if (fmt == CMIT_FMT_USERFORMAT) {
1265                format_commit_message(commit, user_format, sb, context);
1266                return;
1267        }
1268
1269        reencoded = reencode_commit_message(commit, &encoding);
1270        if (reencoded) {
1271                msg = reencoded;
1272        }
1273
1274        if (fmt == CMIT_FMT_ONELINE || fmt == CMIT_FMT_EMAIL)
1275                indent = 0;
1276
1277        /*
1278         * We need to check and emit Content-type: to mark it
1279         * as 8-bit if we haven't done so.
1280         */
1281        if (fmt == CMIT_FMT_EMAIL && need_8bit_cte == 0) {
1282                int i, ch, in_body;
1283
1284                for (in_body = i = 0; (ch = msg[i]); i++) {
1285                        if (!in_body) {
1286                                /* author could be non 7-bit ASCII but
1287                                 * the log may be so; skip over the
1288                                 * header part first.
1289                                 */
1290                                if (ch == '\n' && msg[i+1] == '\n')
1291                                        in_body = 1;
1292                        }
1293                        else if (non_ascii(ch)) {
1294                                need_8bit_cte = 1;
1295                                break;
1296                        }
1297                }
1298        }
1299
1300        pp_header(fmt, context->abbrev, context->date_mode, encoding,
1301                  commit, &msg, sb);
1302        if (fmt != CMIT_FMT_ONELINE && !context->subject) {
1303                strbuf_addch(sb, '\n');
1304        }
1305
1306        /* Skip excess blank lines at the beginning of body, if any... */
1307        msg = skip_empty_lines(msg);
1308
1309        /* These formats treat the title line specially. */
1310        if (fmt == CMIT_FMT_ONELINE || fmt == CMIT_FMT_EMAIL)
1311                pp_title_line(fmt, &msg, sb, context->subject,
1312                              context->after_subject, encoding, need_8bit_cte);
1313
1314        beginning_of_body = sb->len;
1315        if (fmt != CMIT_FMT_ONELINE)
1316                pp_remainder(fmt, &msg, sb, indent);
1317        strbuf_rtrim(sb);
1318
1319        /* Make sure there is an EOLN for the non-oneline case */
1320        if (fmt != CMIT_FMT_ONELINE)
1321                strbuf_addch(sb, '\n');
1322
1323        /*
1324         * The caller may append additional body text in e-mail
1325         * format.  Make sure we did not strip the blank line
1326         * between the header and the body.
1327         */
1328        if (fmt == CMIT_FMT_EMAIL && sb->len <= beginning_of_body)
1329                strbuf_addch(sb, '\n');
1330
1331        if (context->show_notes)
1332                format_display_notes(commit->object.sha1, sb, encoding,
1333                                     NOTES_SHOW_HEADER | NOTES_INDENT);
1334
1335        free(reencoded);
1336}