Andrew's git / gitweb.git / pretty.c
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pretty.con commit test: do not LoadModule log_config_module unconditionally (7d59cee)
   1#include "cache.h"
   2#include "commit.h"
   3#include "utf8.h"
   4#include "diff.h"
   5#include "revision.h"
   6#include "string-list.h"
   7#include "mailmap.h"
   8#include "log-tree.h"
   9#include "color.h"
  10
  11static char *user_format;
  12
  13static void save_user_format(struct rev_info *rev, const char *cp, int is_tformat)
  14{
  15        free(user_format);
  16        user_format = xstrdup(cp);
  17        if (is_tformat)
  18                rev->use_terminator = 1;
  19        rev->commit_format = CMIT_FMT_USERFORMAT;
  20}
  21
  22void get_commit_format(const char *arg, struct rev_info *rev)
  23{
  24        int i;
  25        static struct cmt_fmt_map {
  26                const char *n;
  27                size_t cmp_len;
  28                enum cmit_fmt v;
  29        } cmt_fmts[] = {
  30                { "raw",        1,      CMIT_FMT_RAW },
  31                { "medium",     1,      CMIT_FMT_MEDIUM },
  32                { "short",      1,      CMIT_FMT_SHORT },
  33                { "email",      1,      CMIT_FMT_EMAIL },
  34                { "full",       5,      CMIT_FMT_FULL },
  35                { "fuller",     5,      CMIT_FMT_FULLER },
  36                { "oneline",    1,      CMIT_FMT_ONELINE },
  37        };
  38
  39        rev->use_terminator = 0;
  40        if (!arg || !*arg) {
  41                rev->commit_format = CMIT_FMT_DEFAULT;
  42                return;
  43        }
  44        if (!prefixcmp(arg, "format:") || !prefixcmp(arg, "tformat:")) {
  45                save_user_format(rev, strchr(arg, ':') + 1, arg[0] == 't');
  46                return;
  47        }
  48        for (i = 0; i < ARRAY_SIZE(cmt_fmts); i++) {
  49                if (!strncmp(arg, cmt_fmts[i].n, cmt_fmts[i].cmp_len) &&
  50                    !strncmp(arg, cmt_fmts[i].n, strlen(arg))) {
  51                        if (cmt_fmts[i].v == CMIT_FMT_ONELINE)
  52                                rev->use_terminator = 1;
  53                        rev->commit_format = cmt_fmts[i].v;
  54                        return;
  55                }
  56        }
  57        if (strchr(arg, '%')) {
  58                save_user_format(rev, arg, 1);
  59                return;
  60        }
  61
  62        die("invalid --pretty format: %s", arg);
  63}
  64
  65/*
  66 * Generic support for pretty-printing the header
  67 */
  68static int get_one_line(const char *msg)
  69{
  70        int ret = 0;
  71
  72        for (;;) {
  73                char c = *msg++;
  74                if (!c)
  75                        break;
  76                ret++;
  77                if (c == '\n')
  78                        break;
  79        }
  80        return ret;
  81}
  82
  83/* High bit set, or ISO-2022-INT */
  84int non_ascii(int ch)
  85{
  86        return !isascii(ch) || ch == '\033';
  87}
  88
  89static int is_rfc2047_special(char ch)
  90{
  91        return (non_ascii(ch) || (ch == '=') || (ch == '?') || (ch == '_'));
  92}
  93
  94static void add_rfc2047(struct strbuf *sb, const char *line, int len,
  95                       const char *encoding)
  96{
  97        int i, last;
  98
  99        for (i = 0; i < len; i++) {
 100                int ch = line[i];
 101                if (non_ascii(ch))
 102                        goto needquote;
 103                if ((i + 1 < len) && (ch == '=' && line[i+1] == '?'))
 104                        goto needquote;
 105        }
 106        strbuf_add(sb, line, len);
 107        return;
 108
 109needquote:
 110        strbuf_grow(sb, len * 3 + strlen(encoding) + 100);
 111        strbuf_addf(sb, "=?%s?q?", encoding);
 112        for (i = last = 0; i < len; i++) {
 113                unsigned ch = line[i] & 0xFF;
 114                /*
 115                 * We encode ' ' using '=20' even though rfc2047
 116                 * allows using '_' for readability.  Unfortunately,
 117                 * many programs do not understand this and just
 118                 * leave the underscore in place.
 119                 */
 120                if (is_rfc2047_special(ch) || ch == ' ') {
 121                        strbuf_add(sb, line + last, i - last);
 122                        strbuf_addf(sb, "=%02X", ch);
 123                        last = i + 1;
 124                }
 125        }
 126        strbuf_add(sb, line + last, len - last);
 127        strbuf_addstr(sb, "?=");
 128}
 129
 130void pp_user_info(const char *what, enum cmit_fmt fmt, struct strbuf *sb,
 131                  const char *line, enum date_mode dmode,
 132                  const char *encoding)
 133{
 134        char *date;
 135        int namelen;
 136        unsigned long time;
 137        int tz;
 138        const char *filler = "    ";
 139
 140        if (fmt == CMIT_FMT_ONELINE)
 141                return;
 142        date = strchr(line, '>');
 143        if (!date)
 144                return;
 145        namelen = ++date - line;
 146        time = strtoul(date, &date, 10);
 147        tz = strtol(date, NULL, 10);
 148
 149        if (fmt == CMIT_FMT_EMAIL) {
 150                char *name_tail = strchr(line, '<');
 151                int display_name_length;
 152                if (!name_tail)
 153                        return;
 154                while (line < name_tail && isspace(name_tail[-1]))
 155                        name_tail--;
 156                display_name_length = name_tail - line;
 157                filler = "";
 158                strbuf_addstr(sb, "From: ");
 159                add_rfc2047(sb, line, display_name_length, encoding);
 160                strbuf_add(sb, name_tail, namelen - display_name_length);
 161                strbuf_addch(sb, '\n');
 162        } else {
 163                strbuf_addf(sb, "%s: %.*s%.*s\n", what,
 164                              (fmt == CMIT_FMT_FULLER) ? 4 : 0,
 165                              filler, namelen, line);
 166        }
 167        switch (fmt) {
 168        case CMIT_FMT_MEDIUM:
 169                strbuf_addf(sb, "Date:   %s\n", show_date(time, tz, dmode));
 170                break;
 171        case CMIT_FMT_EMAIL:
 172                strbuf_addf(sb, "Date: %s\n", show_date(time, tz, DATE_RFC2822));
 173                break;
 174        case CMIT_FMT_FULLER:
 175                strbuf_addf(sb, "%sDate: %s\n", what, show_date(time, tz, dmode));
 176                break;
 177        default:
 178                /* notin' */
 179                break;
 180        }
 181}
 182
 183static int is_empty_line(const char *line, int *len_p)
 184{
 185        int len = *len_p;
 186        while (len && isspace(line[len-1]))
 187                len--;
 188        *len_p = len;
 189        return !len;
 190}
 191
 192static const char *skip_empty_lines(const char *msg)
 193{
 194        for (;;) {
 195                int linelen = get_one_line(msg);
 196                int ll = linelen;
 197                if (!linelen)
 198                        break;
 199                if (!is_empty_line(msg, &ll))
 200                        break;
 201                msg += linelen;
 202        }
 203        return msg;
 204}
 205
 206static void add_merge_info(enum cmit_fmt fmt, struct strbuf *sb,
 207                        const struct commit *commit, int abbrev)
 208{
 209        struct commit_list *parent = commit->parents;
 210
 211        if ((fmt == CMIT_FMT_ONELINE) || (fmt == CMIT_FMT_EMAIL) ||
 212            !parent || !parent->next)
 213                return;
 214
 215        strbuf_addstr(sb, "Merge:");
 216
 217        while (parent) {
 218                struct commit *p = parent->item;
 219                const char *hex = NULL;
 220                if (abbrev)
 221                        hex = find_unique_abbrev(p->object.sha1, abbrev);
 222                if (!hex)
 223                        hex = sha1_to_hex(p->object.sha1);
 224                parent = parent->next;
 225
 226                strbuf_addf(sb, " %s", hex);
 227        }
 228        strbuf_addch(sb, '\n');
 229}
 230
 231static char *get_header(const struct commit *commit, const char *key)
 232{
 233        int key_len = strlen(key);
 234        const char *line = commit->buffer;
 235
 236        for (;;) {
 237                const char *eol = strchr(line, '\n'), *next;
 238
 239                if (line == eol)
 240                        return NULL;
 241                if (!eol) {
 242                        eol = line + strlen(line);
 243                        next = NULL;
 244                } else
 245                        next = eol + 1;
 246                if (eol - line > key_len &&
 247                    !strncmp(line, key, key_len) &&
 248                    line[key_len] == ' ') {
 249                        return xmemdupz(line + key_len + 1, eol - line - key_len - 1);
 250                }
 251                line = next;
 252        }
 253}
 254
 255static char *replace_encoding_header(char *buf, const char *encoding)
 256{
 257        struct strbuf tmp = STRBUF_INIT;
 258        size_t start, len;
 259        char *cp = buf;
 260
 261        /* guess if there is an encoding header before a \n\n */
 262        while (strncmp(cp, "encoding ", strlen("encoding "))) {
 263                cp = strchr(cp, '\n');
 264                if (!cp || *++cp == '\n')
 265                        return buf;
 266        }
 267        start = cp - buf;
 268        cp = strchr(cp, '\n');
 269        if (!cp)
 270                return buf; /* should not happen but be defensive */
 271        len = cp + 1 - (buf + start);
 272
 273        strbuf_attach(&tmp, buf, strlen(buf), strlen(buf) + 1);
 274        if (is_encoding_utf8(encoding)) {
 275                /* we have re-coded to UTF-8; drop the header */
 276                strbuf_remove(&tmp, start, len);
 277        } else {
 278                /* just replaces XXXX in 'encoding XXXX\n' */
 279                strbuf_splice(&tmp, start + strlen("encoding "),
 280                                          len - strlen("encoding \n"),
 281                                          encoding, strlen(encoding));
 282        }
 283        return strbuf_detach(&tmp, NULL);
 284}
 285
 286static char *logmsg_reencode(const struct commit *commit,
 287                             const char *output_encoding)
 288{
 289        static const char *utf8 = "utf-8";
 290        const char *use_encoding;
 291        char *encoding;
 292        char *out;
 293
 294        if (!*output_encoding)
 295                return NULL;
 296        encoding = get_header(commit, "encoding");
 297        use_encoding = encoding ? encoding : utf8;
 298        if (!strcmp(use_encoding, output_encoding))
 299                if (encoding) /* we'll strip encoding header later */
 300                        out = xstrdup(commit->buffer);
 301                else
 302                        return NULL; /* nothing to do */
 303        else
 304                out = reencode_string(commit->buffer,
 305                                      output_encoding, use_encoding);
 306        if (out)
 307                out = replace_encoding_header(out, output_encoding);
 308
 309        free(encoding);
 310        return out;
 311}
 312
 313static int mailmap_name(char *email, int email_len, char *name, int name_len)
 314{
 315        static struct string_list *mail_map;
 316        if (!mail_map) {
 317                mail_map = xcalloc(1, sizeof(*mail_map));
 318                read_mailmap(mail_map, NULL);
 319        }
 320        return mail_map->nr && map_user(mail_map, email, email_len, name, name_len);
 321}
 322
 323static size_t format_person_part(struct strbuf *sb, char part,
 324                                 const char *msg, int len, enum date_mode dmode)
 325{
 326        /* currently all placeholders have same length */
 327        const int placeholder_len = 2;
 328        int start, end, tz = 0;
 329        unsigned long date = 0;
 330        char *ep;
 331        const char *name_start, *name_end, *mail_start, *mail_end, *msg_end = msg+len;
 332        char person_name[1024];
 333        char person_mail[1024];
 334
 335        /* advance 'end' to point to email start delimiter */
 336        for (end = 0; end < len && msg[end] != '<'; end++)
 337                ; /* do nothing */
 338
 339        /*
 340         * When end points at the '<' that we found, it should have
 341         * matching '>' later, which means 'end' must be strictly
 342         * below len - 1.
 343         */
 344        if (end >= len - 2)
 345                goto skip;
 346
 347        /* Seek for both name and email part */
 348        name_start = msg;
 349        name_end = msg+end;
 350        while (name_end > name_start && isspace(*(name_end-1)))
 351                name_end--;
 352        mail_start = msg+end+1;
 353        mail_end = mail_start;
 354        while (mail_end < msg_end && *mail_end != '>')
 355                mail_end++;
 356        if (mail_end == msg_end)
 357                goto skip;
 358        end = mail_end-msg;
 359
 360        if (part == 'N' || part == 'E') { /* mailmap lookup */
 361                strlcpy(person_name, name_start, name_end-name_start+1);
 362                strlcpy(person_mail, mail_start, mail_end-mail_start+1);
 363                mailmap_name(person_mail, sizeof(person_mail), person_name, sizeof(person_name));
 364                name_start = person_name;
 365                name_end = name_start + strlen(person_name);
 366                mail_start = person_mail;
 367                mail_end = mail_start +  strlen(person_mail);
 368        }
 369        if (part == 'n' || part == 'N') {       /* name */
 370                strbuf_add(sb, name_start, name_end-name_start);
 371                return placeholder_len;
 372        }
 373        if (part == 'e' || part == 'E') {       /* email */
 374                strbuf_add(sb, mail_start, mail_end-mail_start);
 375                return placeholder_len;
 376        }
 377
 378        /* advance 'start' to point to date start delimiter */
 379        for (start = end + 1; start < len && isspace(msg[start]); start++)
 380                ; /* do nothing */
 381        if (start >= len)
 382                goto skip;
 383        date = strtoul(msg + start, &ep, 10);
 384        if (msg + start == ep)
 385                goto skip;
 386
 387        if (part == 't') {      /* date, UNIX timestamp */
 388                strbuf_add(sb, msg + start, ep - (msg + start));
 389                return placeholder_len;
 390        }
 391
 392        /* parse tz */
 393        for (start = ep - msg + 1; start < len && isspace(msg[start]); start++)
 394                ; /* do nothing */
 395        if (start + 1 < len) {
 396                tz = strtoul(msg + start + 1, NULL, 10);
 397                if (msg[start] == '-')
 398                        tz = -tz;
 399        }
 400
 401        switch (part) {
 402        case 'd':       /* date */
 403                strbuf_addstr(sb, show_date(date, tz, dmode));
 404                return placeholder_len;
 405        case 'D':       /* date, RFC2822 style */
 406                strbuf_addstr(sb, show_date(date, tz, DATE_RFC2822));
 407                return placeholder_len;
 408        case 'r':       /* date, relative */
 409                strbuf_addstr(sb, show_date(date, tz, DATE_RELATIVE));
 410                return placeholder_len;
 411        case 'i':       /* date, ISO 8601 */
 412                strbuf_addstr(sb, show_date(date, tz, DATE_ISO8601));
 413                return placeholder_len;
 414        }
 415
 416skip:
 417        /*
 418         * bogus commit, 'sb' cannot be updated, but we still need to
 419         * compute a valid return value.
 420         */
 421        if (part == 'n' || part == 'e' || part == 't' || part == 'd'
 422            || part == 'D' || part == 'r' || part == 'i')
 423                return placeholder_len;
 424
 425        return 0; /* unknown placeholder */
 426}
 427
 428struct chunk {
 429        size_t off;
 430        size_t len;
 431};
 432
 433struct format_commit_context {
 434        const struct commit *commit;
 435        enum date_mode dmode;
 436        unsigned commit_header_parsed:1;
 437        unsigned commit_message_parsed:1;
 438
 439        /* These offsets are relative to the start of the commit message. */
 440        struct chunk author;
 441        struct chunk committer;
 442        struct chunk encoding;
 443        size_t message_off;
 444        size_t subject_off;
 445        size_t body_off;
 446
 447        /* The following ones are relative to the result struct strbuf. */
 448        struct chunk abbrev_commit_hash;
 449        struct chunk abbrev_tree_hash;
 450        struct chunk abbrev_parent_hashes;
 451};
 452
 453static int add_again(struct strbuf *sb, struct chunk *chunk)
 454{
 455        if (chunk->len) {
 456                strbuf_adddup(sb, chunk->off, chunk->len);
 457                return 1;
 458        }
 459
 460        /*
 461         * We haven't seen this chunk before.  Our caller is surely
 462         * going to add it the hard way now.  Remember the most likely
 463         * start of the to-be-added chunk: the current end of the
 464         * struct strbuf.
 465         */
 466        chunk->off = sb->len;
 467        return 0;
 468}
 469
 470static void parse_commit_header(struct format_commit_context *context)
 471{
 472        const char *msg = context->commit->buffer;
 473        int i;
 474
 475        for (i = 0; msg[i]; i++) {
 476                int eol;
 477                for (eol = i; msg[eol] && msg[eol] != '\n'; eol++)
 478                        ; /* do nothing */
 479
 480                if (i == eol) {
 481                        break;
 482                } else if (!prefixcmp(msg + i, "author ")) {
 483                        context->author.off = i + 7;
 484                        context->author.len = eol - i - 7;
 485                } else if (!prefixcmp(msg + i, "committer ")) {
 486                        context->committer.off = i + 10;
 487                        context->committer.len = eol - i - 10;
 488                } else if (!prefixcmp(msg + i, "encoding ")) {
 489                        context->encoding.off = i + 9;
 490                        context->encoding.len = eol - i - 9;
 491                }
 492                i = eol;
 493        }
 494        context->message_off = i;
 495        context->commit_header_parsed = 1;
 496}
 497
 498const char *format_subject(struct strbuf *sb, const char *msg,
 499                           const char *line_separator)
 500{
 501        int first = 1;
 502
 503        for (;;) {
 504                const char *line = msg;
 505                int linelen = get_one_line(line);
 506
 507                msg += linelen;
 508                if (!linelen || is_empty_line(line, &linelen))
 509                        break;
 510
 511                if (!sb)
 512                        continue;
 513                strbuf_grow(sb, linelen + 2);
 514                if (!first)
 515                        strbuf_addstr(sb, line_separator);
 516                strbuf_add(sb, line, linelen);
 517                first = 0;
 518        }
 519        return msg;
 520}
 521
 522static void parse_commit_message(struct format_commit_context *c)
 523{
 524        const char *msg = c->commit->buffer + c->message_off;
 525        const char *start = c->commit->buffer;
 526
 527        msg = skip_empty_lines(msg);
 528        c->subject_off = msg - start;
 529
 530        msg = format_subject(NULL, msg, NULL);
 531        msg = skip_empty_lines(msg);
 532        c->body_off = msg - start;
 533
 534        c->commit_message_parsed = 1;
 535}
 536
 537static void format_decoration(struct strbuf *sb, const struct commit *commit)
 538{
 539        struct name_decoration *d;
 540        const char *prefix = " (";
 541
 542        load_ref_decorations();
 543        d = lookup_decoration(&name_decoration, &commit->object);
 544        while (d) {
 545                strbuf_addstr(sb, prefix);
 546                prefix = ", ";
 547                strbuf_addstr(sb, d->name);
 548                d = d->next;
 549        }
 550        if (prefix[0] == ',')
 551                strbuf_addch(sb, ')');
 552}
 553
 554static size_t format_commit_item(struct strbuf *sb, const char *placeholder,
 555                               void *context)
 556{
 557        struct format_commit_context *c = context;
 558        const struct commit *commit = c->commit;
 559        const char *msg = commit->buffer;
 560        struct commit_list *p;
 561        int h1, h2;
 562
 563        /* these are independent of the commit */
 564        switch (placeholder[0]) {
 565        case 'C':
 566                if (placeholder[1] == '(') {
 567                        const char *end = strchr(placeholder + 2, ')');
 568                        char color[COLOR_MAXLEN];
 569                        if (!end)
 570                                return 0;
 571                        color_parse_mem(placeholder + 2,
 572                                        end - (placeholder + 2),
 573                                        "--pretty format", color);
 574                        strbuf_addstr(sb, color);
 575                        return end - placeholder + 1;
 576                }
 577                if (!prefixcmp(placeholder + 1, "red")) {
 578                        strbuf_addstr(sb, GIT_COLOR_RED);
 579                        return 4;
 580                } else if (!prefixcmp(placeholder + 1, "green")) {
 581                        strbuf_addstr(sb, GIT_COLOR_GREEN);
 582                        return 6;
 583                } else if (!prefixcmp(placeholder + 1, "blue")) {
 584                        strbuf_addstr(sb, GIT_COLOR_BLUE);
 585                        return 5;
 586                } else if (!prefixcmp(placeholder + 1, "reset")) {
 587                        strbuf_addstr(sb, GIT_COLOR_RESET);
 588                        return 6;
 589                } else
 590                        return 0;
 591        case 'n':               /* newline */
 592                strbuf_addch(sb, '\n');
 593                return 1;
 594        case 'x':
 595                /* %x00 == NUL, %x0a == LF, etc. */
 596                if (0 <= (h1 = hexval_table[0xff & placeholder[1]]) &&
 597                    h1 <= 16 &&
 598                    0 <= (h2 = hexval_table[0xff & placeholder[2]]) &&
 599                    h2 <= 16) {
 600                        strbuf_addch(sb, (h1<<4)|h2);
 601                        return 3;
 602                } else
 603                        return 0;
 604        }
 605
 606        /* these depend on the commit */
 607        if (!commit->object.parsed)
 608                parse_object(commit->object.sha1);
 609
 610        switch (placeholder[0]) {
 611        case 'H':               /* commit hash */
 612                strbuf_addstr(sb, sha1_to_hex(commit->object.sha1));
 613                return 1;
 614        case 'h':               /* abbreviated commit hash */
 615                if (add_again(sb, &c->abbrev_commit_hash))
 616                        return 1;
 617                strbuf_addstr(sb, find_unique_abbrev(commit->object.sha1,
 618                                                     DEFAULT_ABBREV));
 619                c->abbrev_commit_hash.len = sb->len - c->abbrev_commit_hash.off;
 620                return 1;
 621        case 'T':               /* tree hash */
 622                strbuf_addstr(sb, sha1_to_hex(commit->tree->object.sha1));
 623                return 1;
 624        case 't':               /* abbreviated tree hash */
 625                if (add_again(sb, &c->abbrev_tree_hash))
 626                        return 1;
 627                strbuf_addstr(sb, find_unique_abbrev(commit->tree->object.sha1,
 628                                                     DEFAULT_ABBREV));
 629                c->abbrev_tree_hash.len = sb->len - c->abbrev_tree_hash.off;
 630                return 1;
 631        case 'P':               /* parent hashes */
 632                for (p = commit->parents; p; p = p->next) {
 633                        if (p != commit->parents)
 634                                strbuf_addch(sb, ' ');
 635                        strbuf_addstr(sb, sha1_to_hex(p->item->object.sha1));
 636                }
 637                return 1;
 638        case 'p':               /* abbreviated parent hashes */
 639                if (add_again(sb, &c->abbrev_parent_hashes))
 640                        return 1;
 641                for (p = commit->parents; p; p = p->next) {
 642                        if (p != commit->parents)
 643                                strbuf_addch(sb, ' ');
 644                        strbuf_addstr(sb, find_unique_abbrev(
 645                                        p->item->object.sha1, DEFAULT_ABBREV));
 646                }
 647                c->abbrev_parent_hashes.len = sb->len -
 648                                              c->abbrev_parent_hashes.off;
 649                return 1;
 650        case 'm':               /* left/right/bottom */
 651                strbuf_addch(sb, (commit->object.flags & BOUNDARY)
 652                                 ? '-'
 653                                 : (commit->object.flags & SYMMETRIC_LEFT)
 654                                 ? '<'
 655                                 : '>');
 656                return 1;
 657        case 'd':
 658                format_decoration(sb, commit);
 659                return 1;
 660        }
 661
 662        /* For the rest we have to parse the commit header. */
 663        if (!c->commit_header_parsed)
 664                parse_commit_header(c);
 665
 666        switch (placeholder[0]) {
 667        case 'a':       /* author ... */
 668                return format_person_part(sb, placeholder[1],
 669                                   msg + c->author.off, c->author.len,
 670                                   c->dmode);
 671        case 'c':       /* committer ... */
 672                return format_person_part(sb, placeholder[1],
 673                                   msg + c->committer.off, c->committer.len,
 674                                   c->dmode);
 675        case 'e':       /* encoding */
 676                strbuf_add(sb, msg + c->encoding.off, c->encoding.len);
 677                return 1;
 678        }
 679
 680        /* Now we need to parse the commit message. */
 681        if (!c->commit_message_parsed)
 682                parse_commit_message(c);
 683
 684        switch (placeholder[0]) {
 685        case 's':       /* subject */
 686                format_subject(sb, msg + c->subject_off, " ");
 687                return 1;
 688        case 'b':       /* body */
 689                strbuf_addstr(sb, msg + c->body_off);
 690                return 1;
 691        }
 692        return 0;       /* unknown placeholder */
 693}
 694
 695void format_commit_message(const struct commit *commit,
 696                           const void *format, struct strbuf *sb,
 697                           enum date_mode dmode)
 698{
 699        struct format_commit_context context;
 700
 701        memset(&context, 0, sizeof(context));
 702        context.commit = commit;
 703        context.dmode = dmode;
 704        strbuf_expand(sb, format, format_commit_item, &context);
 705}
 706
 707static void pp_header(enum cmit_fmt fmt,
 708                      int abbrev,
 709                      enum date_mode dmode,
 710                      const char *encoding,
 711                      const struct commit *commit,
 712                      const char **msg_p,
 713                      struct strbuf *sb)
 714{
 715        int parents_shown = 0;
 716
 717        for (;;) {
 718                const char *line = *msg_p;
 719                int linelen = get_one_line(*msg_p);
 720
 721                if (!linelen)
 722                        return;
 723                *msg_p += linelen;
 724
 725                if (linelen == 1)
 726                        /* End of header */
 727                        return;
 728
 729                if (fmt == CMIT_FMT_RAW) {
 730                        strbuf_add(sb, line, linelen);
 731                        continue;
 732                }
 733
 734                if (!memcmp(line, "parent ", 7)) {
 735                        if (linelen != 48)
 736                                die("bad parent line in commit");
 737                        continue;
 738                }
 739
 740                if (!parents_shown) {
 741                        struct commit_list *parent;
 742                        int num;
 743                        for (parent = commit->parents, num = 0;
 744                             parent;
 745                             parent = parent->next, num++)
 746                                ;
 747                        /* with enough slop */
 748                        strbuf_grow(sb, num * 50 + 20);
 749                        add_merge_info(fmt, sb, commit, abbrev);
 750                        parents_shown = 1;
 751                }
 752
 753                /*
 754                 * MEDIUM == DEFAULT shows only author with dates.
 755                 * FULL shows both authors but not dates.
 756                 * FULLER shows both authors and dates.
 757                 */
 758                if (!memcmp(line, "author ", 7)) {
 759                        strbuf_grow(sb, linelen + 80);
 760                        pp_user_info("Author", fmt, sb, line + 7, dmode, encoding);
 761                }
 762                if (!memcmp(line, "committer ", 10) &&
 763                    (fmt == CMIT_FMT_FULL || fmt == CMIT_FMT_FULLER)) {
 764                        strbuf_grow(sb, linelen + 80);
 765                        pp_user_info("Commit", fmt, sb, line + 10, dmode, encoding);
 766                }
 767        }
 768}
 769
 770void pp_title_line(enum cmit_fmt fmt,
 771                   const char **msg_p,
 772                   struct strbuf *sb,
 773                   const char *subject,
 774                   const char *after_subject,
 775                   const char *encoding,
 776                   int need_8bit_cte)
 777{
 778        const char *line_separator = (fmt == CMIT_FMT_EMAIL) ? "\n " : " ";
 779        struct strbuf title;
 780
 781        strbuf_init(&title, 80);
 782        *msg_p = format_subject(&title, *msg_p, line_separator);
 783
 784        strbuf_grow(sb, title.len + 1024);
 785        if (subject) {
 786                strbuf_addstr(sb, subject);
 787                add_rfc2047(sb, title.buf, title.len, encoding);
 788        } else {
 789                strbuf_addbuf(sb, &title);
 790        }
 791        strbuf_addch(sb, '\n');
 792
 793        if (need_8bit_cte > 0) {
 794                const char *header_fmt =
 795                        "MIME-Version: 1.0\n"
 796                        "Content-Type: text/plain; charset=%s\n"
 797                        "Content-Transfer-Encoding: 8bit\n";
 798                strbuf_addf(sb, header_fmt, encoding);
 799        }
 800        if (after_subject) {
 801                strbuf_addstr(sb, after_subject);
 802        }
 803        if (fmt == CMIT_FMT_EMAIL) {
 804                strbuf_addch(sb, '\n');
 805        }
 806        strbuf_release(&title);
 807}
 808
 809void pp_remainder(enum cmit_fmt fmt,
 810                  const char **msg_p,
 811                  struct strbuf *sb,
 812                  int indent)
 813{
 814        int first = 1;
 815        for (;;) {
 816                const char *line = *msg_p;
 817                int linelen = get_one_line(line);
 818                *msg_p += linelen;
 819
 820                if (!linelen)
 821                        break;
 822
 823                if (is_empty_line(line, &linelen)) {
 824                        if (first)
 825                                continue;
 826                        if (fmt == CMIT_FMT_SHORT)
 827                                break;
 828                }
 829                first = 0;
 830
 831                strbuf_grow(sb, linelen + indent + 20);
 832                if (indent) {
 833                        memset(sb->buf + sb->len, ' ', indent);
 834                        strbuf_setlen(sb, sb->len + indent);
 835                }
 836                strbuf_add(sb, line, linelen);
 837                strbuf_addch(sb, '\n');
 838        }
 839}
 840
 841char *reencode_commit_message(const struct commit *commit, const char **encoding_p)
 842{
 843        const char *encoding;
 844
 845        encoding = (git_log_output_encoding
 846                    ? git_log_output_encoding
 847                    : git_commit_encoding);
 848        if (!encoding)
 849                encoding = "utf-8";
 850        if (encoding_p)
 851                *encoding_p = encoding;
 852        return logmsg_reencode(commit, encoding);
 853}
 854
 855void pretty_print_commit(enum cmit_fmt fmt, const struct commit *commit,
 856                         struct strbuf *sb, int abbrev,
 857                         const char *subject, const char *after_subject,
 858                         enum date_mode dmode, int need_8bit_cte)
 859{
 860        unsigned long beginning_of_body;
 861        int indent = 4;
 862        const char *msg = commit->buffer;
 863        char *reencoded;
 864        const char *encoding;
 865
 866        if (fmt == CMIT_FMT_USERFORMAT) {
 867                format_commit_message(commit, user_format, sb, dmode);
 868                return;
 869        }
 870
 871        reencoded = reencode_commit_message(commit, &encoding);
 872        if (reencoded) {
 873                msg = reencoded;
 874        }
 875
 876        if (fmt == CMIT_FMT_ONELINE || fmt == CMIT_FMT_EMAIL)
 877                indent = 0;
 878
 879        /*
 880         * We need to check and emit Content-type: to mark it
 881         * as 8-bit if we haven't done so.
 882         */
 883        if (fmt == CMIT_FMT_EMAIL && need_8bit_cte == 0) {
 884                int i, ch, in_body;
 885
 886                for (in_body = i = 0; (ch = msg[i]); i++) {
 887                        if (!in_body) {
 888                                /* author could be non 7-bit ASCII but
 889                                 * the log may be so; skip over the
 890                                 * header part first.
 891                                 */
 892                                if (ch == '\n' && msg[i+1] == '\n')
 893                                        in_body = 1;
 894                        }
 895                        else if (non_ascii(ch)) {
 896                                need_8bit_cte = 1;
 897                                break;
 898                        }
 899                }
 900        }
 901
 902        pp_header(fmt, abbrev, dmode, encoding, commit, &msg, sb);
 903        if (fmt != CMIT_FMT_ONELINE && !subject) {
 904                strbuf_addch(sb, '\n');
 905        }
 906
 907        /* Skip excess blank lines at the beginning of body, if any... */
 908        msg = skip_empty_lines(msg);
 909
 910        /* These formats treat the title line specially. */
 911        if (fmt == CMIT_FMT_ONELINE || fmt == CMIT_FMT_EMAIL)
 912                pp_title_line(fmt, &msg, sb, subject,
 913                              after_subject, encoding, need_8bit_cte);
 914
 915        beginning_of_body = sb->len;
 916        if (fmt != CMIT_FMT_ONELINE)
 917                pp_remainder(fmt, &msg, sb, indent);
 918        strbuf_rtrim(sb);
 919
 920        /* Make sure there is an EOLN for the non-oneline case */
 921        if (fmt != CMIT_FMT_ONELINE)
 922                strbuf_addch(sb, '\n');
 923
 924        /*
 925         * The caller may append additional body text in e-mail
 926         * format.  Make sure we did not strip the blank line
 927         * between the header and the body.
 928         */
 929        if (fmt == CMIT_FMT_EMAIL && sb->len <= beginning_of_body)
 930                strbuf_addch(sb, '\n');
 931        free(reencoded);
 932}