Andrew's git / gitweb.git / pretty.c
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pretty.con commit Add support for -p/--patch to git-commit (b4bd466)
   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_rfc2047_special(char ch)
 212{
 213        return (non_ascii(ch) || (ch == '=') || (ch == '?') || (ch == '_'));
 214}
 215
 216static void add_rfc2047(struct strbuf *sb, const char *line, int len,
 217                       const char *encoding)
 218{
 219        static const int max_length = 78; /* per rfc2822 */
 220        int i;
 221        int line_len;
 222
 223        /* How many bytes are already used on the current line? */
 224        for (i = sb->len - 1; i >= 0; i--)
 225                if (sb->buf[i] == '\n')
 226                        break;
 227        line_len = sb->len - (i+1);
 228
 229        for (i = 0; i < len; i++) {
 230                int ch = line[i];
 231                if (non_ascii(ch) || ch == '\n')
 232                        goto needquote;
 233                if ((i + 1 < len) && (ch == '=' && line[i+1] == '?'))
 234                        goto needquote;
 235        }
 236        strbuf_add_wrapped_bytes(sb, line, len, 0, 1, max_length - line_len);
 237        return;
 238
 239needquote:
 240        strbuf_grow(sb, len * 3 + strlen(encoding) + 100);
 241        strbuf_addf(sb, "=?%s?q?", encoding);
 242        line_len += strlen(encoding) + 5; /* 5 for =??q? */
 243        for (i = 0; i < len; i++) {
 244                unsigned ch = line[i] & 0xFF;
 245
 246                if (line_len >= max_length - 2) {
 247                        strbuf_addf(sb, "?=\n =?%s?q?", encoding);
 248                        line_len = strlen(encoding) + 5 + 1; /* =??q? plus SP */
 249                }
 250
 251                /*
 252                 * We encode ' ' using '=20' even though rfc2047
 253                 * allows using '_' for readability.  Unfortunately,
 254                 * many programs do not understand this and just
 255                 * leave the underscore in place.
 256                 */
 257                if (is_rfc2047_special(ch) || ch == ' ' || ch == '\n') {
 258                        strbuf_addf(sb, "=%02X", ch);
 259                        line_len += 3;
 260                }
 261                else {
 262                        strbuf_addch(sb, ch);
 263                        line_len++;
 264                }
 265        }
 266        strbuf_addstr(sb, "?=");
 267}
 268
 269void pp_user_info(const char *what, enum cmit_fmt fmt, struct strbuf *sb,
 270                  const char *line, enum date_mode dmode,
 271                  const char *encoding)
 272{
 273        char *date;
 274        int namelen;
 275        unsigned long time;
 276        int tz;
 277
 278        if (fmt == CMIT_FMT_ONELINE)
 279                return;
 280        date = strchr(line, '>');
 281        if (!date)
 282                return;
 283        namelen = ++date - line;
 284        time = strtoul(date, &date, 10);
 285        tz = strtol(date, NULL, 10);
 286
 287        if (fmt == CMIT_FMT_EMAIL) {
 288                char *name_tail = strchr(line, '<');
 289                int display_name_length;
 290                if (!name_tail)
 291                        return;
 292                while (line < name_tail && isspace(name_tail[-1]))
 293                        name_tail--;
 294                display_name_length = name_tail - line;
 295                strbuf_addstr(sb, "From: ");
 296                add_rfc2047(sb, line, display_name_length, encoding);
 297                strbuf_add(sb, name_tail, namelen - display_name_length);
 298                strbuf_addch(sb, '\n');
 299        } else {
 300                strbuf_addf(sb, "%s: %.*s%.*s\n", what,
 301                              (fmt == CMIT_FMT_FULLER) ? 4 : 0,
 302                              "    ", namelen, line);
 303        }
 304        switch (fmt) {
 305        case CMIT_FMT_MEDIUM:
 306                strbuf_addf(sb, "Date:   %s\n", show_date(time, tz, dmode));
 307                break;
 308        case CMIT_FMT_EMAIL:
 309                strbuf_addf(sb, "Date: %s\n", show_date(time, tz, DATE_RFC2822));
 310                break;
 311        case CMIT_FMT_FULLER:
 312                strbuf_addf(sb, "%sDate: %s\n", what, show_date(time, tz, dmode));
 313                break;
 314        default:
 315                /* notin' */
 316                break;
 317        }
 318}
 319
 320static int is_empty_line(const char *line, int *len_p)
 321{
 322        int len = *len_p;
 323        while (len && isspace(line[len-1]))
 324                len--;
 325        *len_p = len;
 326        return !len;
 327}
 328
 329static const char *skip_empty_lines(const char *msg)
 330{
 331        for (;;) {
 332                int linelen = get_one_line(msg);
 333                int ll = linelen;
 334                if (!linelen)
 335                        break;
 336                if (!is_empty_line(msg, &ll))
 337                        break;
 338                msg += linelen;
 339        }
 340        return msg;
 341}
 342
 343static void add_merge_info(enum cmit_fmt fmt, struct strbuf *sb,
 344                        const struct commit *commit, int abbrev)
 345{
 346        struct commit_list *parent = commit->parents;
 347
 348        if ((fmt == CMIT_FMT_ONELINE) || (fmt == CMIT_FMT_EMAIL) ||
 349            !parent || !parent->next)
 350                return;
 351
 352        strbuf_addstr(sb, "Merge:");
 353
 354        while (parent) {
 355                struct commit *p = parent->item;
 356                const char *hex = NULL;
 357                if (abbrev)
 358                        hex = find_unique_abbrev(p->object.sha1, abbrev);
 359                if (!hex)
 360                        hex = sha1_to_hex(p->object.sha1);
 361                parent = parent->next;
 362
 363                strbuf_addf(sb, " %s", hex);
 364        }
 365        strbuf_addch(sb, '\n');
 366}
 367
 368static char *get_header(const struct commit *commit, const char *key)
 369{
 370        int key_len = strlen(key);
 371        const char *line = commit->buffer;
 372
 373        for (;;) {
 374                const char *eol = strchr(line, '\n'), *next;
 375
 376                if (line == eol)
 377                        return NULL;
 378                if (!eol) {
 379                        eol = line + strlen(line);
 380                        next = NULL;
 381                } else
 382                        next = eol + 1;
 383                if (eol - line > key_len &&
 384                    !strncmp(line, key, key_len) &&
 385                    line[key_len] == ' ') {
 386                        return xmemdupz(line + key_len + 1, eol - line - key_len - 1);
 387                }
 388                line = next;
 389        }
 390}
 391
 392static char *replace_encoding_header(char *buf, const char *encoding)
 393{
 394        struct strbuf tmp = STRBUF_INIT;
 395        size_t start, len;
 396        char *cp = buf;
 397
 398        /* guess if there is an encoding header before a \n\n */
 399        while (strncmp(cp, "encoding ", strlen("encoding "))) {
 400                cp = strchr(cp, '\n');
 401                if (!cp || *++cp == '\n')
 402                        return buf;
 403        }
 404        start = cp - buf;
 405        cp = strchr(cp, '\n');
 406        if (!cp)
 407                return buf; /* should not happen but be defensive */
 408        len = cp + 1 - (buf + start);
 409
 410        strbuf_attach(&tmp, buf, strlen(buf), strlen(buf) + 1);
 411        if (is_encoding_utf8(encoding)) {
 412                /* we have re-coded to UTF-8; drop the header */
 413                strbuf_remove(&tmp, start, len);
 414        } else {
 415                /* just replaces XXXX in 'encoding XXXX\n' */
 416                strbuf_splice(&tmp, start + strlen("encoding "),
 417                                          len - strlen("encoding \n"),
 418                                          encoding, strlen(encoding));
 419        }
 420        return strbuf_detach(&tmp, NULL);
 421}
 422
 423char *logmsg_reencode(const struct commit *commit,
 424                      const char *output_encoding)
 425{
 426        static const char *utf8 = "UTF-8";
 427        const char *use_encoding;
 428        char *encoding;
 429        char *out;
 430
 431        if (!*output_encoding)
 432                return NULL;
 433        encoding = get_header(commit, "encoding");
 434        use_encoding = encoding ? encoding : utf8;
 435        if (!strcmp(use_encoding, output_encoding))
 436                if (encoding) /* we'll strip encoding header later */
 437                        out = xstrdup(commit->buffer);
 438                else
 439                        return NULL; /* nothing to do */
 440        else
 441                out = reencode_string(commit->buffer,
 442                                      output_encoding, use_encoding);
 443        if (out)
 444                out = replace_encoding_header(out, output_encoding);
 445
 446        free(encoding);
 447        return out;
 448}
 449
 450static int mailmap_name(char *email, int email_len, char *name, int name_len)
 451{
 452        static struct string_list *mail_map;
 453        if (!mail_map) {
 454                mail_map = xcalloc(1, sizeof(*mail_map));
 455                read_mailmap(mail_map, NULL);
 456        }
 457        return mail_map->nr && map_user(mail_map, email, email_len, name, name_len);
 458}
 459
 460static size_t format_person_part(struct strbuf *sb, char part,
 461                                 const char *msg, int len, enum date_mode dmode)
 462{
 463        /* currently all placeholders have same length */
 464        const int placeholder_len = 2;
 465        int start, end, tz = 0;
 466        unsigned long date = 0;
 467        char *ep;
 468        const char *name_start, *name_end, *mail_start, *mail_end, *msg_end = msg+len;
 469        char person_name[1024];
 470        char person_mail[1024];
 471
 472        /* advance 'end' to point to email start delimiter */
 473        for (end = 0; end < len && msg[end] != '<'; end++)
 474                ; /* do nothing */
 475
 476        /*
 477         * When end points at the '<' that we found, it should have
 478         * matching '>' later, which means 'end' must be strictly
 479         * below len - 1.
 480         */
 481        if (end >= len - 2)
 482                goto skip;
 483
 484        /* Seek for both name and email part */
 485        name_start = msg;
 486        name_end = msg+end;
 487        while (name_end > name_start && isspace(*(name_end-1)))
 488                name_end--;
 489        mail_start = msg+end+1;
 490        mail_end = mail_start;
 491        while (mail_end < msg_end && *mail_end != '>')
 492                mail_end++;
 493        if (mail_end == msg_end)
 494                goto skip;
 495        end = mail_end-msg;
 496
 497        if (part == 'N' || part == 'E') { /* mailmap lookup */
 498                strlcpy(person_name, name_start, name_end-name_start+1);
 499                strlcpy(person_mail, mail_start, mail_end-mail_start+1);
 500                mailmap_name(person_mail, sizeof(person_mail), person_name, sizeof(person_name));
 501                name_start = person_name;
 502                name_end = name_start + strlen(person_name);
 503                mail_start = person_mail;
 504                mail_end = mail_start +  strlen(person_mail);
 505        }
 506        if (part == 'n' || part == 'N') {       /* name */
 507                strbuf_add(sb, name_start, name_end-name_start);
 508                return placeholder_len;
 509        }
 510        if (part == 'e' || part == 'E') {       /* email */
 511                strbuf_add(sb, mail_start, mail_end-mail_start);
 512                return placeholder_len;
 513        }
 514
 515        /* advance 'start' to point to date start delimiter */
 516        for (start = end + 1; start < len && isspace(msg[start]); start++)
 517                ; /* do nothing */
 518        if (start >= len)
 519                goto skip;
 520        date = strtoul(msg + start, &ep, 10);
 521        if (msg + start == ep)
 522                goto skip;
 523
 524        if (part == 't') {      /* date, UNIX timestamp */
 525                strbuf_add(sb, msg + start, ep - (msg + start));
 526                return placeholder_len;
 527        }
 528
 529        /* parse tz */
 530        for (start = ep - msg + 1; start < len && isspace(msg[start]); start++)
 531                ; /* do nothing */
 532        if (start + 1 < len) {
 533                tz = strtoul(msg + start + 1, NULL, 10);
 534                if (msg[start] == '-')
 535                        tz = -tz;
 536        }
 537
 538        switch (part) {
 539        case 'd':       /* date */
 540                strbuf_addstr(sb, show_date(date, tz, dmode));
 541                return placeholder_len;
 542        case 'D':       /* date, RFC2822 style */
 543                strbuf_addstr(sb, show_date(date, tz, DATE_RFC2822));
 544                return placeholder_len;
 545        case 'r':       /* date, relative */
 546                strbuf_addstr(sb, show_date(date, tz, DATE_RELATIVE));
 547                return placeholder_len;
 548        case 'i':       /* date, ISO 8601 */
 549                strbuf_addstr(sb, show_date(date, tz, DATE_ISO8601));
 550                return placeholder_len;
 551        }
 552
 553skip:
 554        /*
 555         * bogus commit, 'sb' cannot be updated, but we still need to
 556         * compute a valid return value.
 557         */
 558        if (part == 'n' || part == 'e' || part == 't' || part == 'd'
 559            || part == 'D' || part == 'r' || part == 'i')
 560                return placeholder_len;
 561
 562        return 0; /* unknown placeholder */
 563}
 564
 565struct chunk {
 566        size_t off;
 567        size_t len;
 568};
 569
 570struct format_commit_context {
 571        const struct commit *commit;
 572        const struct pretty_print_context *pretty_ctx;
 573        unsigned commit_header_parsed:1;
 574        unsigned commit_message_parsed:1;
 575        char *message;
 576        size_t width, indent1, indent2;
 577
 578        /* These offsets are relative to the start of the commit message. */
 579        struct chunk author;
 580        struct chunk committer;
 581        struct chunk encoding;
 582        size_t message_off;
 583        size_t subject_off;
 584        size_t body_off;
 585
 586        /* The following ones are relative to the result struct strbuf. */
 587        struct chunk abbrev_commit_hash;
 588        struct chunk abbrev_tree_hash;
 589        struct chunk abbrev_parent_hashes;
 590        size_t wrap_start;
 591};
 592
 593static int add_again(struct strbuf *sb, struct chunk *chunk)
 594{
 595        if (chunk->len) {
 596                strbuf_adddup(sb, chunk->off, chunk->len);
 597                return 1;
 598        }
 599
 600        /*
 601         * We haven't seen this chunk before.  Our caller is surely
 602         * going to add it the hard way now.  Remember the most likely
 603         * start of the to-be-added chunk: the current end of the
 604         * struct strbuf.
 605         */
 606        chunk->off = sb->len;
 607        return 0;
 608}
 609
 610static void parse_commit_header(struct format_commit_context *context)
 611{
 612        const char *msg = context->message;
 613        int i;
 614
 615        for (i = 0; msg[i]; i++) {
 616                int eol;
 617                for (eol = i; msg[eol] && msg[eol] != '\n'; eol++)
 618                        ; /* do nothing */
 619
 620                if (i == eol) {
 621                        break;
 622                } else if (!prefixcmp(msg + i, "author ")) {
 623                        context->author.off = i + 7;
 624                        context->author.len = eol - i - 7;
 625                } else if (!prefixcmp(msg + i, "committer ")) {
 626                        context->committer.off = i + 10;
 627                        context->committer.len = eol - i - 10;
 628                } else if (!prefixcmp(msg + i, "encoding ")) {
 629                        context->encoding.off = i + 9;
 630                        context->encoding.len = eol - i - 9;
 631                }
 632                i = eol;
 633        }
 634        context->message_off = i;
 635        context->commit_header_parsed = 1;
 636}
 637
 638static int istitlechar(char c)
 639{
 640        return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') ||
 641                (c >= '0' && c <= '9') || c == '.' || c == '_';
 642}
 643
 644static void format_sanitized_subject(struct strbuf *sb, const char *msg)
 645{
 646        size_t trimlen;
 647        size_t start_len = sb->len;
 648        int space = 2;
 649
 650        for (; *msg && *msg != '\n'; msg++) {
 651                if (istitlechar(*msg)) {
 652                        if (space == 1)
 653                                strbuf_addch(sb, '-');
 654                        space = 0;
 655                        strbuf_addch(sb, *msg);
 656                        if (*msg == '.')
 657                                while (*(msg+1) == '.')
 658                                        msg++;
 659                } else
 660                        space |= 1;
 661        }
 662
 663        /* trim any trailing '.' or '-' characters */
 664        trimlen = 0;
 665        while (sb->len - trimlen > start_len &&
 666                (sb->buf[sb->len - 1 - trimlen] == '.'
 667                || sb->buf[sb->len - 1 - trimlen] == '-'))
 668                trimlen++;
 669        strbuf_remove(sb, sb->len - trimlen, trimlen);
 670}
 671
 672const char *format_subject(struct strbuf *sb, const char *msg,
 673                           const char *line_separator)
 674{
 675        int first = 1;
 676
 677        for (;;) {
 678                const char *line = msg;
 679                int linelen = get_one_line(line);
 680
 681                msg += linelen;
 682                if (!linelen || is_empty_line(line, &linelen))
 683                        break;
 684
 685                if (!sb)
 686                        continue;
 687                strbuf_grow(sb, linelen + 2);
 688                if (!first)
 689                        strbuf_addstr(sb, line_separator);
 690                strbuf_add(sb, line, linelen);
 691                first = 0;
 692        }
 693        return msg;
 694}
 695
 696static void parse_commit_message(struct format_commit_context *c)
 697{
 698        const char *msg = c->message + c->message_off;
 699        const char *start = c->message;
 700
 701        msg = skip_empty_lines(msg);
 702        c->subject_off = msg - start;
 703
 704        msg = format_subject(NULL, msg, NULL);
 705        msg = skip_empty_lines(msg);
 706        c->body_off = msg - start;
 707
 708        c->commit_message_parsed = 1;
 709}
 710
 711static void format_decoration(struct strbuf *sb, const struct commit *commit)
 712{
 713        struct name_decoration *d;
 714        const char *prefix = " (";
 715
 716        load_ref_decorations(DECORATE_SHORT_REFS);
 717        d = lookup_decoration(&name_decoration, &commit->object);
 718        while (d) {
 719                strbuf_addstr(sb, prefix);
 720                prefix = ", ";
 721                strbuf_addstr(sb, d->name);
 722                d = d->next;
 723        }
 724        if (prefix[0] == ',')
 725                strbuf_addch(sb, ')');
 726}
 727
 728static void strbuf_wrap(struct strbuf *sb, size_t pos,
 729                        size_t width, size_t indent1, size_t indent2)
 730{
 731        struct strbuf tmp = STRBUF_INIT;
 732
 733        if (pos)
 734                strbuf_add(&tmp, sb->buf, pos);
 735        strbuf_add_wrapped_text(&tmp, sb->buf + pos,
 736                                (int) indent1, (int) indent2, (int) width);
 737        strbuf_swap(&tmp, sb);
 738        strbuf_release(&tmp);
 739}
 740
 741static void rewrap_message_tail(struct strbuf *sb,
 742                                struct format_commit_context *c,
 743                                size_t new_width, size_t new_indent1,
 744                                size_t new_indent2)
 745{
 746        if (c->width == new_width && c->indent1 == new_indent1 &&
 747            c->indent2 == new_indent2)
 748                return;
 749        if (c->wrap_start < sb->len)
 750                strbuf_wrap(sb, c->wrap_start, c->width, c->indent1, c->indent2);
 751        c->wrap_start = sb->len;
 752        c->width = new_width;
 753        c->indent1 = new_indent1;
 754        c->indent2 = new_indent2;
 755}
 756
 757static size_t format_commit_one(struct strbuf *sb, const char *placeholder,
 758                                void *context)
 759{
 760        struct format_commit_context *c = context;
 761        const struct commit *commit = c->commit;
 762        const char *msg = c->message;
 763        struct commit_list *p;
 764        int h1, h2;
 765
 766        /* these are independent of the commit */
 767        switch (placeholder[0]) {
 768        case 'C':
 769                if (placeholder[1] == '(') {
 770                        const char *end = strchr(placeholder + 2, ')');
 771                        char color[COLOR_MAXLEN];
 772                        if (!end)
 773                                return 0;
 774                        color_parse_mem(placeholder + 2,
 775                                        end - (placeholder + 2),
 776                                        "--pretty format", color);
 777                        strbuf_addstr(sb, color);
 778                        return end - placeholder + 1;
 779                }
 780                if (!prefixcmp(placeholder + 1, "red")) {
 781                        strbuf_addstr(sb, GIT_COLOR_RED);
 782                        return 4;
 783                } else if (!prefixcmp(placeholder + 1, "green")) {
 784                        strbuf_addstr(sb, GIT_COLOR_GREEN);
 785                        return 6;
 786                } else if (!prefixcmp(placeholder + 1, "blue")) {
 787                        strbuf_addstr(sb, GIT_COLOR_BLUE);
 788                        return 5;
 789                } else if (!prefixcmp(placeholder + 1, "reset")) {
 790                        strbuf_addstr(sb, GIT_COLOR_RESET);
 791                        return 6;
 792                } else
 793                        return 0;
 794        case 'n':               /* newline */
 795                strbuf_addch(sb, '\n');
 796                return 1;
 797        case 'x':
 798                /* %x00 == NUL, %x0a == LF, etc. */
 799                if (0 <= (h1 = hexval_table[0xff & placeholder[1]]) &&
 800                    h1 <= 16 &&
 801                    0 <= (h2 = hexval_table[0xff & placeholder[2]]) &&
 802                    h2 <= 16) {
 803                        strbuf_addch(sb, (h1<<4)|h2);
 804                        return 3;
 805                } else
 806                        return 0;
 807        case 'w':
 808                if (placeholder[1] == '(') {
 809                        unsigned long width = 0, indent1 = 0, indent2 = 0;
 810                        char *next;
 811                        const char *start = placeholder + 2;
 812                        const char *end = strchr(start, ')');
 813                        if (!end)
 814                                return 0;
 815                        if (end > start) {
 816                                width = strtoul(start, &next, 10);
 817                                if (*next == ',') {
 818                                        indent1 = strtoul(next + 1, &next, 10);
 819                                        if (*next == ',') {
 820                                                indent2 = strtoul(next + 1,
 821                                                                 &next, 10);
 822                                        }
 823                                }
 824                                if (*next != ')')
 825                                        return 0;
 826                        }
 827                        rewrap_message_tail(sb, c, width, indent1, indent2);
 828                        return end - placeholder + 1;
 829                } else
 830                        return 0;
 831        }
 832
 833        /* these depend on the commit */
 834        if (!commit->object.parsed)
 835                parse_object(commit->object.sha1);
 836
 837        switch (placeholder[0]) {
 838        case 'H':               /* commit hash */
 839                strbuf_addstr(sb, sha1_to_hex(commit->object.sha1));
 840                return 1;
 841        case 'h':               /* abbreviated commit hash */
 842                if (add_again(sb, &c->abbrev_commit_hash))
 843                        return 1;
 844                strbuf_addstr(sb, find_unique_abbrev(commit->object.sha1,
 845                                                     c->pretty_ctx->abbrev));
 846                c->abbrev_commit_hash.len = sb->len - c->abbrev_commit_hash.off;
 847                return 1;
 848        case 'T':               /* tree hash */
 849                strbuf_addstr(sb, sha1_to_hex(commit->tree->object.sha1));
 850                return 1;
 851        case 't':               /* abbreviated tree hash */
 852                if (add_again(sb, &c->abbrev_tree_hash))
 853                        return 1;
 854                strbuf_addstr(sb, find_unique_abbrev(commit->tree->object.sha1,
 855                                                     c->pretty_ctx->abbrev));
 856                c->abbrev_tree_hash.len = sb->len - c->abbrev_tree_hash.off;
 857                return 1;
 858        case 'P':               /* parent hashes */
 859                for (p = commit->parents; p; p = p->next) {
 860                        if (p != commit->parents)
 861                                strbuf_addch(sb, ' ');
 862                        strbuf_addstr(sb, sha1_to_hex(p->item->object.sha1));
 863                }
 864                return 1;
 865        case 'p':               /* abbreviated parent hashes */
 866                if (add_again(sb, &c->abbrev_parent_hashes))
 867                        return 1;
 868                for (p = commit->parents; p; p = p->next) {
 869                        if (p != commit->parents)
 870                                strbuf_addch(sb, ' ');
 871                        strbuf_addstr(sb, find_unique_abbrev(
 872                                        p->item->object.sha1,
 873                                        c->pretty_ctx->abbrev));
 874                }
 875                c->abbrev_parent_hashes.len = sb->len -
 876                                              c->abbrev_parent_hashes.off;
 877                return 1;
 878        case 'm':               /* left/right/bottom */
 879                strbuf_addstr(sb, get_revision_mark(NULL, commit));
 880                return 1;
 881        case 'd':
 882                format_decoration(sb, commit);
 883                return 1;
 884        case 'g':               /* reflog info */
 885                switch(placeholder[1]) {
 886                case 'd':       /* reflog selector */
 887                case 'D':
 888                        if (c->pretty_ctx->reflog_info)
 889                                get_reflog_selector(sb,
 890                                                    c->pretty_ctx->reflog_info,
 891                                                    c->pretty_ctx->date_mode,
 892                                                    (placeholder[1] == 'd'));
 893                        return 2;
 894                case 's':       /* reflog message */
 895                        if (c->pretty_ctx->reflog_info)
 896                                get_reflog_message(sb, c->pretty_ctx->reflog_info);
 897                        return 2;
 898                }
 899                return 0;       /* unknown %g placeholder */
 900        case 'N':
 901                if (c->pretty_ctx->show_notes) {
 902                        format_display_notes(commit->object.sha1, sb,
 903                                    get_log_output_encoding(), 0);
 904                        return 1;
 905                }
 906                return 0;
 907        }
 908
 909        /* For the rest we have to parse the commit header. */
 910        if (!c->commit_header_parsed)
 911                parse_commit_header(c);
 912
 913        switch (placeholder[0]) {
 914        case 'a':       /* author ... */
 915                return format_person_part(sb, placeholder[1],
 916                                   msg + c->author.off, c->author.len,
 917                                   c->pretty_ctx->date_mode);
 918        case 'c':       /* committer ... */
 919                return format_person_part(sb, placeholder[1],
 920                                   msg + c->committer.off, c->committer.len,
 921                                   c->pretty_ctx->date_mode);
 922        case 'e':       /* encoding */
 923                strbuf_add(sb, msg + c->encoding.off, c->encoding.len);
 924                return 1;
 925        case 'B':       /* raw body */
 926                /* message_off is always left at the initial newline */
 927                strbuf_addstr(sb, msg + c->message_off + 1);
 928                return 1;
 929        }
 930
 931        /* Now we need to parse the commit message. */
 932        if (!c->commit_message_parsed)
 933                parse_commit_message(c);
 934
 935        switch (placeholder[0]) {
 936        case 's':       /* subject */
 937                format_subject(sb, msg + c->subject_off, " ");
 938                return 1;
 939        case 'f':       /* sanitized subject */
 940                format_sanitized_subject(sb, msg + c->subject_off);
 941                return 1;
 942        case 'b':       /* body */
 943                strbuf_addstr(sb, msg + c->body_off);
 944                return 1;
 945        }
 946        return 0;       /* unknown placeholder */
 947}
 948
 949static size_t format_commit_item(struct strbuf *sb, const char *placeholder,
 950                                 void *context)
 951{
 952        int consumed;
 953        size_t orig_len;
 954        enum {
 955                NO_MAGIC,
 956                ADD_LF_BEFORE_NON_EMPTY,
 957                DEL_LF_BEFORE_EMPTY,
 958                ADD_SP_BEFORE_NON_EMPTY
 959        } magic = NO_MAGIC;
 960
 961        switch (placeholder[0]) {
 962        case '-':
 963                magic = DEL_LF_BEFORE_EMPTY;
 964                break;
 965        case '+':
 966                magic = ADD_LF_BEFORE_NON_EMPTY;
 967                break;
 968        case ' ':
 969                magic = ADD_SP_BEFORE_NON_EMPTY;
 970                break;
 971        default:
 972                break;
 973        }
 974        if (magic != NO_MAGIC)
 975                placeholder++;
 976
 977        orig_len = sb->len;
 978        consumed = format_commit_one(sb, placeholder, context);
 979        if (magic == NO_MAGIC)
 980                return consumed;
 981
 982        if ((orig_len == sb->len) && magic == DEL_LF_BEFORE_EMPTY) {
 983                while (sb->len && sb->buf[sb->len - 1] == '\n')
 984                        strbuf_setlen(sb, sb->len - 1);
 985        } else if (orig_len != sb->len) {
 986                if (magic == ADD_LF_BEFORE_NON_EMPTY)
 987                        strbuf_insert(sb, orig_len, "\n", 1);
 988                else if (magic == ADD_SP_BEFORE_NON_EMPTY)
 989                        strbuf_insert(sb, orig_len, " ", 1);
 990        }
 991        return consumed + 1;
 992}
 993
 994static size_t userformat_want_item(struct strbuf *sb, const char *placeholder,
 995                                   void *context)
 996{
 997        struct userformat_want *w = context;
 998
 999        if (*placeholder == '+' || *placeholder == '-' || *placeholder == ' ')
1000                placeholder++;
1001
1002        switch (*placeholder) {
1003        case 'N':
1004                w->notes = 1;
1005                break;
1006        }
1007        return 0;
1008}
1009
1010void userformat_find_requirements(const char *fmt, struct userformat_want *w)
1011{
1012        struct strbuf dummy = STRBUF_INIT;
1013
1014        if (!fmt) {
1015                if (!user_format)
1016                        return;
1017                fmt = user_format;
1018        }
1019        strbuf_expand(&dummy, user_format, userformat_want_item, w);
1020        strbuf_release(&dummy);
1021}
1022
1023void format_commit_message(const struct commit *commit,
1024                           const char *format, struct strbuf *sb,
1025                           const struct pretty_print_context *pretty_ctx)
1026{
1027        struct format_commit_context context;
1028        static const char utf8[] = "UTF-8";
1029        const char *enc;
1030        const char *output_enc = pretty_ctx->output_encoding;
1031
1032        memset(&context, 0, sizeof(context));
1033        context.commit = commit;
1034        context.pretty_ctx = pretty_ctx;
1035        context.wrap_start = sb->len;
1036        context.message = commit->buffer;
1037        if (output_enc) {
1038                enc = get_header(commit, "encoding");
1039                enc = enc ? enc : utf8;
1040                if (strcmp(enc, output_enc))
1041                        context.message = logmsg_reencode(commit, output_enc);
1042        }
1043
1044        strbuf_expand(sb, format, format_commit_item, &context);
1045        rewrap_message_tail(sb, &context, 0, 0, 0);
1046
1047        if (context.message != commit->buffer)
1048                free(context.message);
1049}
1050
1051static void pp_header(enum cmit_fmt fmt,
1052                      int abbrev,
1053                      enum date_mode dmode,
1054                      const char *encoding,
1055                      const struct commit *commit,
1056                      const char **msg_p,
1057                      struct strbuf *sb)
1058{
1059        int parents_shown = 0;
1060
1061        for (;;) {
1062                const char *line = *msg_p;
1063                int linelen = get_one_line(*msg_p);
1064
1065                if (!linelen)
1066                        return;
1067                *msg_p += linelen;
1068
1069                if (linelen == 1)
1070                        /* End of header */
1071                        return;
1072
1073                if (fmt == CMIT_FMT_RAW) {
1074                        strbuf_add(sb, line, linelen);
1075                        continue;
1076                }
1077
1078                if (!memcmp(line, "parent ", 7)) {
1079                        if (linelen != 48)
1080                                die("bad parent line in commit");
1081                        continue;
1082                }
1083
1084                if (!parents_shown) {
1085                        struct commit_list *parent;
1086                        int num;
1087                        for (parent = commit->parents, num = 0;
1088                             parent;
1089                             parent = parent->next, num++)
1090                                ;
1091                        /* with enough slop */
1092                        strbuf_grow(sb, num * 50 + 20);
1093                        add_merge_info(fmt, sb, commit, abbrev);
1094                        parents_shown = 1;
1095                }
1096
1097                /*
1098                 * MEDIUM == DEFAULT shows only author with dates.
1099                 * FULL shows both authors but not dates.
1100                 * FULLER shows both authors and dates.
1101                 */
1102                if (!memcmp(line, "author ", 7)) {
1103                        strbuf_grow(sb, linelen + 80);
1104                        pp_user_info("Author", fmt, sb, line + 7, dmode, encoding);
1105                }
1106                if (!memcmp(line, "committer ", 10) &&
1107                    (fmt == CMIT_FMT_FULL || fmt == CMIT_FMT_FULLER)) {
1108                        strbuf_grow(sb, linelen + 80);
1109                        pp_user_info("Commit", fmt, sb, line + 10, dmode, encoding);
1110                }
1111        }
1112}
1113
1114void pp_title_line(enum cmit_fmt fmt,
1115                   const char **msg_p,
1116                   struct strbuf *sb,
1117                   const char *subject,
1118                   const char *after_subject,
1119                   const char *encoding,
1120                   int need_8bit_cte)
1121{
1122        struct strbuf title;
1123
1124        strbuf_init(&title, 80);
1125        *msg_p = format_subject(&title, *msg_p, " ");
1126
1127        strbuf_grow(sb, title.len + 1024);
1128        if (subject) {
1129                strbuf_addstr(sb, subject);
1130                add_rfc2047(sb, title.buf, title.len, encoding);
1131        } else {
1132                strbuf_addbuf(sb, &title);
1133        }
1134        strbuf_addch(sb, '\n');
1135
1136        if (need_8bit_cte > 0) {
1137                const char *header_fmt =
1138                        "MIME-Version: 1.0\n"
1139                        "Content-Type: text/plain; charset=%s\n"
1140                        "Content-Transfer-Encoding: 8bit\n";
1141                strbuf_addf(sb, header_fmt, encoding);
1142        }
1143        if (after_subject) {
1144                strbuf_addstr(sb, after_subject);
1145        }
1146        if (fmt == CMIT_FMT_EMAIL) {
1147                strbuf_addch(sb, '\n');
1148        }
1149        strbuf_release(&title);
1150}
1151
1152void pp_remainder(enum cmit_fmt fmt,
1153                  const char **msg_p,
1154                  struct strbuf *sb,
1155                  int indent)
1156{
1157        int first = 1;
1158        for (;;) {
1159                const char *line = *msg_p;
1160                int linelen = get_one_line(line);
1161                *msg_p += linelen;
1162
1163                if (!linelen)
1164                        break;
1165
1166                if (is_empty_line(line, &linelen)) {
1167                        if (first)
1168                                continue;
1169                        if (fmt == CMIT_FMT_SHORT)
1170                                break;
1171                }
1172                first = 0;
1173
1174                strbuf_grow(sb, linelen + indent + 20);
1175                if (indent) {
1176                        memset(sb->buf + sb->len, ' ', indent);
1177                        strbuf_setlen(sb, sb->len + indent);
1178                }
1179                strbuf_add(sb, line, linelen);
1180                strbuf_addch(sb, '\n');
1181        }
1182}
1183
1184char *reencode_commit_message(const struct commit *commit, const char **encoding_p)
1185{
1186        const char *encoding;
1187
1188        encoding = get_log_output_encoding();
1189        if (encoding_p)
1190                *encoding_p = encoding;
1191        return logmsg_reencode(commit, encoding);
1192}
1193
1194void pretty_print_commit(enum cmit_fmt fmt, const struct commit *commit,
1195                         struct strbuf *sb,
1196                         const struct pretty_print_context *context)
1197{
1198        unsigned long beginning_of_body;
1199        int indent = 4;
1200        const char *msg = commit->buffer;
1201        char *reencoded;
1202        const char *encoding;
1203        int need_8bit_cte = context->need_8bit_cte;
1204
1205        if (fmt == CMIT_FMT_USERFORMAT) {
1206                format_commit_message(commit, user_format, sb, context);
1207                return;
1208        }
1209
1210        reencoded = reencode_commit_message(commit, &encoding);
1211        if (reencoded) {
1212                msg = reencoded;
1213        }
1214
1215        if (fmt == CMIT_FMT_ONELINE || fmt == CMIT_FMT_EMAIL)
1216                indent = 0;
1217
1218        /*
1219         * We need to check and emit Content-type: to mark it
1220         * as 8-bit if we haven't done so.
1221         */
1222        if (fmt == CMIT_FMT_EMAIL && need_8bit_cte == 0) {
1223                int i, ch, in_body;
1224
1225                for (in_body = i = 0; (ch = msg[i]); i++) {
1226                        if (!in_body) {
1227                                /* author could be non 7-bit ASCII but
1228                                 * the log may be so; skip over the
1229                                 * header part first.
1230                                 */
1231                                if (ch == '\n' && msg[i+1] == '\n')
1232                                        in_body = 1;
1233                        }
1234                        else if (non_ascii(ch)) {
1235                                need_8bit_cte = 1;
1236                                break;
1237                        }
1238                }
1239        }
1240
1241        pp_header(fmt, context->abbrev, context->date_mode, encoding,
1242                  commit, &msg, sb);
1243        if (fmt != CMIT_FMT_ONELINE && !context->subject) {
1244                strbuf_addch(sb, '\n');
1245        }
1246
1247        /* Skip excess blank lines at the beginning of body, if any... */
1248        msg = skip_empty_lines(msg);
1249
1250        /* These formats treat the title line specially. */
1251        if (fmt == CMIT_FMT_ONELINE || fmt == CMIT_FMT_EMAIL)
1252                pp_title_line(fmt, &msg, sb, context->subject,
1253                              context->after_subject, encoding, need_8bit_cte);
1254
1255        beginning_of_body = sb->len;
1256        if (fmt != CMIT_FMT_ONELINE)
1257                pp_remainder(fmt, &msg, sb, indent);
1258        strbuf_rtrim(sb);
1259
1260        /* Make sure there is an EOLN for the non-oneline case */
1261        if (fmt != CMIT_FMT_ONELINE)
1262                strbuf_addch(sb, '\n');
1263
1264        /*
1265         * The caller may append additional body text in e-mail
1266         * format.  Make sure we did not strip the blank line
1267         * between the header and the body.
1268         */
1269        if (fmt == CMIT_FMT_EMAIL && sb->len <= beginning_of_body)
1270                strbuf_addch(sb, '\n');
1271
1272        if (context->show_notes)
1273                format_display_notes(commit->object.sha1, sb, encoding,
1274                                     NOTES_SHOW_HEADER | NOTES_INDENT);
1275
1276        free(reencoded);
1277}