Andrew's git / gitweb.git / pretty.c
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pretty.con commit Documentation - More examples for git bisect (fad5c96)
   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
  13void get_commit_format(const char *arg, struct rev_info *rev)
  14{
  15        int i;
  16        static struct cmt_fmt_map {
  17                const char *n;
  18                size_t cmp_len;
  19                enum cmit_fmt v;
  20        } cmt_fmts[] = {
  21                { "raw",        1,      CMIT_FMT_RAW },
  22                { "medium",     1,      CMIT_FMT_MEDIUM },
  23                { "short",      1,      CMIT_FMT_SHORT },
  24                { "email",      1,      CMIT_FMT_EMAIL },
  25                { "full",       5,      CMIT_FMT_FULL },
  26                { "fuller",     5,      CMIT_FMT_FULLER },
  27                { "oneline",    1,      CMIT_FMT_ONELINE },
  28        };
  29
  30        rev->use_terminator = 0;
  31        if (!arg || !*arg) {
  32                rev->commit_format = CMIT_FMT_DEFAULT;
  33                return;
  34        }
  35        if (!prefixcmp(arg, "format:") || !prefixcmp(arg, "tformat:")) {
  36                const char *cp = strchr(arg, ':') + 1;
  37                free(user_format);
  38                user_format = xstrdup(cp);
  39                if (arg[0] == 't')
  40                        rev->use_terminator = 1;
  41                rev->commit_format = CMIT_FMT_USERFORMAT;
  42                return;
  43        }
  44        for (i = 0; i < ARRAY_SIZE(cmt_fmts); i++) {
  45                if (!strncmp(arg, cmt_fmts[i].n, cmt_fmts[i].cmp_len) &&
  46                    !strncmp(arg, cmt_fmts[i].n, strlen(arg))) {
  47                        if (cmt_fmts[i].v == CMIT_FMT_ONELINE)
  48                                rev->use_terminator = 1;
  49                        rev->commit_format = cmt_fmts[i].v;
  50                        return;
  51                }
  52        }
  53
  54        die("invalid --pretty format: %s", arg);
  55}
  56
  57/*
  58 * Generic support for pretty-printing the header
  59 */
  60static int get_one_line(const char *msg)
  61{
  62        int ret = 0;
  63
  64        for (;;) {
  65                char c = *msg++;
  66                if (!c)
  67                        break;
  68                ret++;
  69                if (c == '\n')
  70                        break;
  71        }
  72        return ret;
  73}
  74
  75/* High bit set, or ISO-2022-INT */
  76int non_ascii(int ch)
  77{
  78        ch = (ch & 0xff);
  79        return ((ch & 0x80) || (ch == 0x1b));
  80}
  81
  82static int is_rfc2047_special(char ch)
  83{
  84        return (non_ascii(ch) || (ch == '=') || (ch == '?') || (ch == '_'));
  85}
  86
  87static void add_rfc2047(struct strbuf *sb, const char *line, int len,
  88                       const char *encoding)
  89{
  90        int i, last;
  91
  92        for (i = 0; i < len; i++) {
  93                int ch = line[i];
  94                if (non_ascii(ch))
  95                        goto needquote;
  96                if ((i + 1 < len) && (ch == '=' && line[i+1] == '?'))
  97                        goto needquote;
  98        }
  99        strbuf_add(sb, line, len);
 100        return;
 101
 102needquote:
 103        strbuf_grow(sb, len * 3 + strlen(encoding) + 100);
 104        strbuf_addf(sb, "=?%s?q?", encoding);
 105        for (i = last = 0; i < len; i++) {
 106                unsigned ch = line[i] & 0xFF;
 107                /*
 108                 * We encode ' ' using '=20' even though rfc2047
 109                 * allows using '_' for readability.  Unfortunately,
 110                 * many programs do not understand this and just
 111                 * leave the underscore in place.
 112                 */
 113                if (is_rfc2047_special(ch) || ch == ' ') {
 114                        strbuf_add(sb, line + last, i - last);
 115                        strbuf_addf(sb, "=%02X", ch);
 116                        last = i + 1;
 117                }
 118        }
 119        strbuf_add(sb, line + last, len - last);
 120        strbuf_addstr(sb, "?=");
 121}
 122
 123void pp_user_info(const char *what, enum cmit_fmt fmt, struct strbuf *sb,
 124                  const char *line, enum date_mode dmode,
 125                  const char *encoding)
 126{
 127        char *date;
 128        int namelen;
 129        unsigned long time;
 130        int tz;
 131        const char *filler = "    ";
 132
 133        if (fmt == CMIT_FMT_ONELINE)
 134                return;
 135        date = strchr(line, '>');
 136        if (!date)
 137                return;
 138        namelen = ++date - line;
 139        time = strtoul(date, &date, 10);
 140        tz = strtol(date, NULL, 10);
 141
 142        if (fmt == CMIT_FMT_EMAIL) {
 143                char *name_tail = strchr(line, '<');
 144                int display_name_length;
 145                if (!name_tail)
 146                        return;
 147                while (line < name_tail && isspace(name_tail[-1]))
 148                        name_tail--;
 149                display_name_length = name_tail - line;
 150                filler = "";
 151                strbuf_addstr(sb, "From: ");
 152                add_rfc2047(sb, line, display_name_length, encoding);
 153                strbuf_add(sb, name_tail, namelen - display_name_length);
 154                strbuf_addch(sb, '\n');
 155        } else {
 156                strbuf_addf(sb, "%s: %.*s%.*s\n", what,
 157                              (fmt == CMIT_FMT_FULLER) ? 4 : 0,
 158                              filler, namelen, line);
 159        }
 160        switch (fmt) {
 161        case CMIT_FMT_MEDIUM:
 162                strbuf_addf(sb, "Date:   %s\n", show_date(time, tz, dmode));
 163                break;
 164        case CMIT_FMT_EMAIL:
 165                strbuf_addf(sb, "Date: %s\n", show_date(time, tz, DATE_RFC2822));
 166                break;
 167        case CMIT_FMT_FULLER:
 168                strbuf_addf(sb, "%sDate: %s\n", what, show_date(time, tz, dmode));
 169                break;
 170        default:
 171                /* notin' */
 172                break;
 173        }
 174}
 175
 176static int is_empty_line(const char *line, int *len_p)
 177{
 178        int len = *len_p;
 179        while (len && isspace(line[len-1]))
 180                len--;
 181        *len_p = len;
 182        return !len;
 183}
 184
 185static const char *skip_empty_lines(const char *msg)
 186{
 187        for (;;) {
 188                int linelen = get_one_line(msg);
 189                int ll = linelen;
 190                if (!linelen)
 191                        break;
 192                if (!is_empty_line(msg, &ll))
 193                        break;
 194                msg += linelen;
 195        }
 196        return msg;
 197}
 198
 199static void add_merge_info(enum cmit_fmt fmt, struct strbuf *sb,
 200                        const struct commit *commit, int abbrev)
 201{
 202        struct commit_list *parent = commit->parents;
 203
 204        if ((fmt == CMIT_FMT_ONELINE) || (fmt == CMIT_FMT_EMAIL) ||
 205            !parent || !parent->next)
 206                return;
 207
 208        strbuf_addstr(sb, "Merge:");
 209
 210        while (parent) {
 211                struct commit *p = parent->item;
 212                const char *hex = NULL;
 213                if (abbrev)
 214                        hex = find_unique_abbrev(p->object.sha1, abbrev);
 215                if (!hex)
 216                        hex = sha1_to_hex(p->object.sha1);
 217                parent = parent->next;
 218
 219                strbuf_addf(sb, " %s", hex);
 220        }
 221        strbuf_addch(sb, '\n');
 222}
 223
 224static char *get_header(const struct commit *commit, const char *key)
 225{
 226        int key_len = strlen(key);
 227        const char *line = commit->buffer;
 228
 229        for (;;) {
 230                const char *eol = strchr(line, '\n'), *next;
 231
 232                if (line == eol)
 233                        return NULL;
 234                if (!eol) {
 235                        eol = line + strlen(line);
 236                        next = NULL;
 237                } else
 238                        next = eol + 1;
 239                if (eol - line > key_len &&
 240                    !strncmp(line, key, key_len) &&
 241                    line[key_len] == ' ') {
 242                        return xmemdupz(line + key_len + 1, eol - line - key_len - 1);
 243                }
 244                line = next;
 245        }
 246}
 247
 248static char *replace_encoding_header(char *buf, const char *encoding)
 249{
 250        struct strbuf tmp = STRBUF_INIT;
 251        size_t start, len;
 252        char *cp = buf;
 253
 254        /* guess if there is an encoding header before a \n\n */
 255        while (strncmp(cp, "encoding ", strlen("encoding "))) {
 256                cp = strchr(cp, '\n');
 257                if (!cp || *++cp == '\n')
 258                        return buf;
 259        }
 260        start = cp - buf;
 261        cp = strchr(cp, '\n');
 262        if (!cp)
 263                return buf; /* should not happen but be defensive */
 264        len = cp + 1 - (buf + start);
 265
 266        strbuf_attach(&tmp, buf, strlen(buf), strlen(buf) + 1);
 267        if (is_encoding_utf8(encoding)) {
 268                /* we have re-coded to UTF-8; drop the header */
 269                strbuf_remove(&tmp, start, len);
 270        } else {
 271                /* just replaces XXXX in 'encoding XXXX\n' */
 272                strbuf_splice(&tmp, start + strlen("encoding "),
 273                                          len - strlen("encoding \n"),
 274                                          encoding, strlen(encoding));
 275        }
 276        return strbuf_detach(&tmp, NULL);
 277}
 278
 279static char *logmsg_reencode(const struct commit *commit,
 280                             const char *output_encoding)
 281{
 282        static const char *utf8 = "utf-8";
 283        const char *use_encoding;
 284        char *encoding;
 285        char *out;
 286
 287        if (!*output_encoding)
 288                return NULL;
 289        encoding = get_header(commit, "encoding");
 290        use_encoding = encoding ? encoding : utf8;
 291        if (!strcmp(use_encoding, output_encoding))
 292                if (encoding) /* we'll strip encoding header later */
 293                        out = xstrdup(commit->buffer);
 294                else
 295                        return NULL; /* nothing to do */
 296        else
 297                out = reencode_string(commit->buffer,
 298                                      output_encoding, use_encoding);
 299        if (out)
 300                out = replace_encoding_header(out, output_encoding);
 301
 302        free(encoding);
 303        return out;
 304}
 305
 306static int mailmap_name(char *email, int email_len, char *name, int name_len)
 307{
 308        static struct string_list *mail_map;
 309        if (!mail_map) {
 310                mail_map = xcalloc(1, sizeof(*mail_map));
 311                read_mailmap(mail_map, NULL);
 312        }
 313        return mail_map->nr && map_user(mail_map, email, email_len, name, name_len);
 314}
 315
 316static size_t format_person_part(struct strbuf *sb, char part,
 317                                 const char *msg, int len, enum date_mode dmode)
 318{
 319        /* currently all placeholders have same length */
 320        const int placeholder_len = 2;
 321        int start, end, tz = 0;
 322        unsigned long date = 0;
 323        char *ep;
 324        const char *name_start, *name_end, *mail_start, *mail_end, *msg_end = msg+len;
 325        char person_name[1024];
 326        char person_mail[1024];
 327
 328        /* advance 'end' to point to email start delimiter */
 329        for (end = 0; end < len && msg[end] != '<'; end++)
 330                ; /* do nothing */
 331
 332        /*
 333         * When end points at the '<' that we found, it should have
 334         * matching '>' later, which means 'end' must be strictly
 335         * below len - 1.
 336         */
 337        if (end >= len - 2)
 338                goto skip;
 339
 340        /* Seek for both name and email part */
 341        name_start = msg;
 342        name_end = msg+end;
 343        while (name_end > name_start && isspace(*(name_end-1)))
 344                name_end--;
 345        mail_start = msg+end+1;
 346        mail_end = mail_start;
 347        while (mail_end < msg_end && *mail_end != '>')
 348                mail_end++;
 349        if (mail_end == msg_end)
 350                goto skip;
 351        end = mail_end-msg;
 352
 353        if (part == 'N' || part == 'E') { /* mailmap lookup */
 354                strlcpy(person_name, name_start, name_end-name_start+1);
 355                strlcpy(person_mail, mail_start, mail_end-mail_start+1);
 356                mailmap_name(person_mail, sizeof(person_mail), person_name, sizeof(person_name));
 357                name_start = person_name;
 358                name_end = name_start + strlen(person_name);
 359                mail_start = person_mail;
 360                mail_end = mail_start +  strlen(person_mail);
 361        }
 362        if (part == 'n' || part == 'N') {       /* name */
 363                strbuf_add(sb, name_start, name_end-name_start);
 364                return placeholder_len;
 365        }
 366        if (part == 'e' || part == 'E') {       /* email */
 367                strbuf_add(sb, mail_start, mail_end-mail_start);
 368                return placeholder_len;
 369        }
 370
 371        /* advance 'start' to point to date start delimiter */
 372        for (start = end + 1; start < len && isspace(msg[start]); start++)
 373                ; /* do nothing */
 374        if (start >= len)
 375                goto skip;
 376        date = strtoul(msg + start, &ep, 10);
 377        if (msg + start == ep)
 378                goto skip;
 379
 380        if (part == 't') {      /* date, UNIX timestamp */
 381                strbuf_add(sb, msg + start, ep - (msg + start));
 382                return placeholder_len;
 383        }
 384
 385        /* parse tz */
 386        for (start = ep - msg + 1; start < len && isspace(msg[start]); start++)
 387                ; /* do nothing */
 388        if (start + 1 < len) {
 389                tz = strtoul(msg + start + 1, NULL, 10);
 390                if (msg[start] == '-')
 391                        tz = -tz;
 392        }
 393
 394        switch (part) {
 395        case 'd':       /* date */
 396                strbuf_addstr(sb, show_date(date, tz, dmode));
 397                return placeholder_len;
 398        case 'D':       /* date, RFC2822 style */
 399                strbuf_addstr(sb, show_date(date, tz, DATE_RFC2822));
 400                return placeholder_len;
 401        case 'r':       /* date, relative */
 402                strbuf_addstr(sb, show_date(date, tz, DATE_RELATIVE));
 403                return placeholder_len;
 404        case 'i':       /* date, ISO 8601 */
 405                strbuf_addstr(sb, show_date(date, tz, DATE_ISO8601));
 406                return placeholder_len;
 407        }
 408
 409skip:
 410        /*
 411         * bogus commit, 'sb' cannot be updated, but we still need to
 412         * compute a valid return value.
 413         */
 414        if (part == 'n' || part == 'e' || part == 't' || part == 'd'
 415            || part == 'D' || part == 'r' || part == 'i')
 416                return placeholder_len;
 417
 418        return 0; /* unknown placeholder */
 419}
 420
 421struct chunk {
 422        size_t off;
 423        size_t len;
 424};
 425
 426struct format_commit_context {
 427        const struct commit *commit;
 428        enum date_mode dmode;
 429        unsigned commit_header_parsed:1;
 430        unsigned commit_message_parsed:1;
 431
 432        /* These offsets are relative to the start of the commit message. */
 433        struct chunk author;
 434        struct chunk committer;
 435        struct chunk encoding;
 436        size_t message_off;
 437        size_t subject_off;
 438        size_t body_off;
 439
 440        /* The following ones are relative to the result struct strbuf. */
 441        struct chunk abbrev_commit_hash;
 442        struct chunk abbrev_tree_hash;
 443        struct chunk abbrev_parent_hashes;
 444};
 445
 446static int add_again(struct strbuf *sb, struct chunk *chunk)
 447{
 448        if (chunk->len) {
 449                strbuf_adddup(sb, chunk->off, chunk->len);
 450                return 1;
 451        }
 452
 453        /*
 454         * We haven't seen this chunk before.  Our caller is surely
 455         * going to add it the hard way now.  Remember the most likely
 456         * start of the to-be-added chunk: the current end of the
 457         * struct strbuf.
 458         */
 459        chunk->off = sb->len;
 460        return 0;
 461}
 462
 463static void parse_commit_header(struct format_commit_context *context)
 464{
 465        const char *msg = context->commit->buffer;
 466        int i;
 467
 468        for (i = 0; msg[i]; i++) {
 469                int eol;
 470                for (eol = i; msg[eol] && msg[eol] != '\n'; eol++)
 471                        ; /* do nothing */
 472
 473                if (i == eol) {
 474                        break;
 475                } else if (!prefixcmp(msg + i, "author ")) {
 476                        context->author.off = i + 7;
 477                        context->author.len = eol - i - 7;
 478                } else if (!prefixcmp(msg + i, "committer ")) {
 479                        context->committer.off = i + 10;
 480                        context->committer.len = eol - i - 10;
 481                } else if (!prefixcmp(msg + i, "encoding ")) {
 482                        context->encoding.off = i + 9;
 483                        context->encoding.len = eol - i - 9;
 484                }
 485                i = eol;
 486        }
 487        context->message_off = i;
 488        context->commit_header_parsed = 1;
 489}
 490
 491const char *format_subject(struct strbuf *sb, const char *msg,
 492                           const char *line_separator)
 493{
 494        int first = 1;
 495
 496        for (;;) {
 497                const char *line = msg;
 498                int linelen = get_one_line(line);
 499
 500                msg += linelen;
 501                if (!linelen || is_empty_line(line, &linelen))
 502                        break;
 503
 504                if (!sb)
 505                        continue;
 506                strbuf_grow(sb, linelen + 2);
 507                if (!first)
 508                        strbuf_addstr(sb, line_separator);
 509                strbuf_add(sb, line, linelen);
 510                first = 0;
 511        }
 512        return msg;
 513}
 514
 515static void parse_commit_message(struct format_commit_context *c)
 516{
 517        const char *msg = c->commit->buffer + c->message_off;
 518        const char *start = c->commit->buffer;
 519
 520        msg = skip_empty_lines(msg);
 521        c->subject_off = msg - start;
 522
 523        msg = format_subject(NULL, msg, NULL);
 524        msg = skip_empty_lines(msg);
 525        c->body_off = msg - start;
 526
 527        c->commit_message_parsed = 1;
 528}
 529
 530static void format_decoration(struct strbuf *sb, const struct commit *commit)
 531{
 532        struct name_decoration *d;
 533        const char *prefix = " (";
 534
 535        load_ref_decorations();
 536        d = lookup_decoration(&name_decoration, &commit->object);
 537        while (d) {
 538                strbuf_addstr(sb, prefix);
 539                prefix = ", ";
 540                strbuf_addstr(sb, d->name);
 541                d = d->next;
 542        }
 543        if (prefix[0] == ',')
 544                strbuf_addch(sb, ')');
 545}
 546
 547static size_t format_commit_item(struct strbuf *sb, const char *placeholder,
 548                               void *context)
 549{
 550        struct format_commit_context *c = context;
 551        const struct commit *commit = c->commit;
 552        const char *msg = commit->buffer;
 553        struct commit_list *p;
 554        int h1, h2;
 555
 556        /* these are independent of the commit */
 557        switch (placeholder[0]) {
 558        case 'C':
 559                if (placeholder[1] == '(') {
 560                        const char *end = strchr(placeholder + 2, ')');
 561                        char color[COLOR_MAXLEN];
 562                        if (!end)
 563                                return 0;
 564                        color_parse_mem(placeholder + 2,
 565                                        end - (placeholder + 2),
 566                                        "--pretty format", color);
 567                        strbuf_addstr(sb, color);
 568                        return end - placeholder + 1;
 569                }
 570                if (!prefixcmp(placeholder + 1, "red")) {
 571                        strbuf_addstr(sb, "\033[31m");
 572                        return 4;
 573                } else if (!prefixcmp(placeholder + 1, "green")) {
 574                        strbuf_addstr(sb, "\033[32m");
 575                        return 6;
 576                } else if (!prefixcmp(placeholder + 1, "blue")) {
 577                        strbuf_addstr(sb, "\033[34m");
 578                        return 5;
 579                } else if (!prefixcmp(placeholder + 1, "reset")) {
 580                        strbuf_addstr(sb, "\033[m");
 581                        return 6;
 582                } else
 583                        return 0;
 584        case 'n':               /* newline */
 585                strbuf_addch(sb, '\n');
 586                return 1;
 587        case 'x':
 588                /* %x00 == NUL, %x0a == LF, etc. */
 589                if (0 <= (h1 = hexval_table[0xff & placeholder[1]]) &&
 590                    h1 <= 16 &&
 591                    0 <= (h2 = hexval_table[0xff & placeholder[2]]) &&
 592                    h2 <= 16) {
 593                        strbuf_addch(sb, (h1<<4)|h2);
 594                        return 3;
 595                } else
 596                        return 0;
 597        }
 598
 599        /* these depend on the commit */
 600        if (!commit->object.parsed)
 601                parse_object(commit->object.sha1);
 602
 603        switch (placeholder[0]) {
 604        case 'H':               /* commit hash */
 605                strbuf_addstr(sb, sha1_to_hex(commit->object.sha1));
 606                return 1;
 607        case 'h':               /* abbreviated commit hash */
 608                if (add_again(sb, &c->abbrev_commit_hash))
 609                        return 1;
 610                strbuf_addstr(sb, find_unique_abbrev(commit->object.sha1,
 611                                                     DEFAULT_ABBREV));
 612                c->abbrev_commit_hash.len = sb->len - c->abbrev_commit_hash.off;
 613                return 1;
 614        case 'T':               /* tree hash */
 615                strbuf_addstr(sb, sha1_to_hex(commit->tree->object.sha1));
 616                return 1;
 617        case 't':               /* abbreviated tree hash */
 618                if (add_again(sb, &c->abbrev_tree_hash))
 619                        return 1;
 620                strbuf_addstr(sb, find_unique_abbrev(commit->tree->object.sha1,
 621                                                     DEFAULT_ABBREV));
 622                c->abbrev_tree_hash.len = sb->len - c->abbrev_tree_hash.off;
 623                return 1;
 624        case 'P':               /* parent hashes */
 625                for (p = commit->parents; p; p = p->next) {
 626                        if (p != commit->parents)
 627                                strbuf_addch(sb, ' ');
 628                        strbuf_addstr(sb, sha1_to_hex(p->item->object.sha1));
 629                }
 630                return 1;
 631        case 'p':               /* abbreviated parent hashes */
 632                if (add_again(sb, &c->abbrev_parent_hashes))
 633                        return 1;
 634                for (p = commit->parents; p; p = p->next) {
 635                        if (p != commit->parents)
 636                                strbuf_addch(sb, ' ');
 637                        strbuf_addstr(sb, find_unique_abbrev(
 638                                        p->item->object.sha1, DEFAULT_ABBREV));
 639                }
 640                c->abbrev_parent_hashes.len = sb->len -
 641                                              c->abbrev_parent_hashes.off;
 642                return 1;
 643        case 'm':               /* left/right/bottom */
 644                strbuf_addch(sb, (commit->object.flags & BOUNDARY)
 645                                 ? '-'
 646                                 : (commit->object.flags & SYMMETRIC_LEFT)
 647                                 ? '<'
 648                                 : '>');
 649                return 1;
 650        case 'd':
 651                format_decoration(sb, commit);
 652                return 1;
 653        }
 654
 655        /* For the rest we have to parse the commit header. */
 656        if (!c->commit_header_parsed)
 657                parse_commit_header(c);
 658
 659        switch (placeholder[0]) {
 660        case 'a':       /* author ... */
 661                return format_person_part(sb, placeholder[1],
 662                                   msg + c->author.off, c->author.len,
 663                                   c->dmode);
 664        case 'c':       /* committer ... */
 665                return format_person_part(sb, placeholder[1],
 666                                   msg + c->committer.off, c->committer.len,
 667                                   c->dmode);
 668        case 'e':       /* encoding */
 669                strbuf_add(sb, msg + c->encoding.off, c->encoding.len);
 670                return 1;
 671        }
 672
 673        /* Now we need to parse the commit message. */
 674        if (!c->commit_message_parsed)
 675                parse_commit_message(c);
 676
 677        switch (placeholder[0]) {
 678        case 's':       /* subject */
 679                format_subject(sb, msg + c->subject_off, " ");
 680                return 1;
 681        case 'b':       /* body */
 682                strbuf_addstr(sb, msg + c->body_off);
 683                return 1;
 684        }
 685        return 0;       /* unknown placeholder */
 686}
 687
 688void format_commit_message(const struct commit *commit,
 689                           const void *format, struct strbuf *sb,
 690                           enum date_mode dmode)
 691{
 692        struct format_commit_context context;
 693
 694        memset(&context, 0, sizeof(context));
 695        context.commit = commit;
 696        context.dmode = dmode;
 697        strbuf_expand(sb, format, format_commit_item, &context);
 698}
 699
 700static void pp_header(enum cmit_fmt fmt,
 701                      int abbrev,
 702                      enum date_mode dmode,
 703                      const char *encoding,
 704                      const struct commit *commit,
 705                      const char **msg_p,
 706                      struct strbuf *sb)
 707{
 708        int parents_shown = 0;
 709
 710        for (;;) {
 711                const char *line = *msg_p;
 712                int linelen = get_one_line(*msg_p);
 713
 714                if (!linelen)
 715                        return;
 716                *msg_p += linelen;
 717
 718                if (linelen == 1)
 719                        /* End of header */
 720                        return;
 721
 722                if (fmt == CMIT_FMT_RAW) {
 723                        strbuf_add(sb, line, linelen);
 724                        continue;
 725                }
 726
 727                if (!memcmp(line, "parent ", 7)) {
 728                        if (linelen != 48)
 729                                die("bad parent line in commit");
 730                        continue;
 731                }
 732
 733                if (!parents_shown) {
 734                        struct commit_list *parent;
 735                        int num;
 736                        for (parent = commit->parents, num = 0;
 737                             parent;
 738                             parent = parent->next, num++)
 739                                ;
 740                        /* with enough slop */
 741                        strbuf_grow(sb, num * 50 + 20);
 742                        add_merge_info(fmt, sb, commit, abbrev);
 743                        parents_shown = 1;
 744                }
 745
 746                /*
 747                 * MEDIUM == DEFAULT shows only author with dates.
 748                 * FULL shows both authors but not dates.
 749                 * FULLER shows both authors and dates.
 750                 */
 751                if (!memcmp(line, "author ", 7)) {
 752                        strbuf_grow(sb, linelen + 80);
 753                        pp_user_info("Author", fmt, sb, line + 7, dmode, encoding);
 754                }
 755                if (!memcmp(line, "committer ", 10) &&
 756                    (fmt == CMIT_FMT_FULL || fmt == CMIT_FMT_FULLER)) {
 757                        strbuf_grow(sb, linelen + 80);
 758                        pp_user_info("Commit", fmt, sb, line + 10, dmode, encoding);
 759                }
 760        }
 761}
 762
 763void pp_title_line(enum cmit_fmt fmt,
 764                   const char **msg_p,
 765                   struct strbuf *sb,
 766                   const char *subject,
 767                   const char *after_subject,
 768                   const char *encoding,
 769                   int need_8bit_cte)
 770{
 771        const char *line_separator = (fmt == CMIT_FMT_EMAIL) ? "\n " : " ";
 772        struct strbuf title;
 773
 774        strbuf_init(&title, 80);
 775        *msg_p = format_subject(&title, *msg_p, line_separator);
 776
 777        strbuf_grow(sb, title.len + 1024);
 778        if (subject) {
 779                strbuf_addstr(sb, subject);
 780                add_rfc2047(sb, title.buf, title.len, encoding);
 781        } else {
 782                strbuf_addbuf(sb, &title);
 783        }
 784        strbuf_addch(sb, '\n');
 785
 786        if (need_8bit_cte > 0) {
 787                const char *header_fmt =
 788                        "MIME-Version: 1.0\n"
 789                        "Content-Type: text/plain; charset=%s\n"
 790                        "Content-Transfer-Encoding: 8bit\n";
 791                strbuf_addf(sb, header_fmt, encoding);
 792        }
 793        if (after_subject) {
 794                strbuf_addstr(sb, after_subject);
 795        }
 796        if (fmt == CMIT_FMT_EMAIL) {
 797                strbuf_addch(sb, '\n');
 798        }
 799        strbuf_release(&title);
 800}
 801
 802void pp_remainder(enum cmit_fmt fmt,
 803                  const char **msg_p,
 804                  struct strbuf *sb,
 805                  int indent)
 806{
 807        int first = 1;
 808        for (;;) {
 809                const char *line = *msg_p;
 810                int linelen = get_one_line(line);
 811                *msg_p += linelen;
 812
 813                if (!linelen)
 814                        break;
 815
 816                if (is_empty_line(line, &linelen)) {
 817                        if (first)
 818                                continue;
 819                        if (fmt == CMIT_FMT_SHORT)
 820                                break;
 821                }
 822                first = 0;
 823
 824                strbuf_grow(sb, linelen + indent + 20);
 825                if (indent) {
 826                        memset(sb->buf + sb->len, ' ', indent);
 827                        strbuf_setlen(sb, sb->len + indent);
 828                }
 829                strbuf_add(sb, line, linelen);
 830                strbuf_addch(sb, '\n');
 831        }
 832}
 833
 834char *reencode_commit_message(const struct commit *commit, const char **encoding_p)
 835{
 836        const char *encoding;
 837
 838        encoding = (git_log_output_encoding
 839                    ? git_log_output_encoding
 840                    : git_commit_encoding);
 841        if (!encoding)
 842                encoding = "utf-8";
 843        if (encoding_p)
 844                *encoding_p = encoding;
 845        return logmsg_reencode(commit, encoding);
 846}
 847
 848void pretty_print_commit(enum cmit_fmt fmt, const struct commit *commit,
 849                         struct strbuf *sb, int abbrev,
 850                         const char *subject, const char *after_subject,
 851                         enum date_mode dmode, int need_8bit_cte)
 852{
 853        unsigned long beginning_of_body;
 854        int indent = 4;
 855        const char *msg = commit->buffer;
 856        char *reencoded;
 857        const char *encoding;
 858
 859        if (fmt == CMIT_FMT_USERFORMAT) {
 860                format_commit_message(commit, user_format, sb, dmode);
 861                return;
 862        }
 863
 864        reencoded = reencode_commit_message(commit, &encoding);
 865        if (reencoded) {
 866                msg = reencoded;
 867        }
 868
 869        if (fmt == CMIT_FMT_ONELINE || fmt == CMIT_FMT_EMAIL)
 870                indent = 0;
 871
 872        /*
 873         * We need to check and emit Content-type: to mark it
 874         * as 8-bit if we haven't done so.
 875         */
 876        if (fmt == CMIT_FMT_EMAIL && need_8bit_cte == 0) {
 877                int i, ch, in_body;
 878
 879                for (in_body = i = 0; (ch = msg[i]); i++) {
 880                        if (!in_body) {
 881                                /* author could be non 7-bit ASCII but
 882                                 * the log may be so; skip over the
 883                                 * header part first.
 884                                 */
 885                                if (ch == '\n' && msg[i+1] == '\n')
 886                                        in_body = 1;
 887                        }
 888                        else if (non_ascii(ch)) {
 889                                need_8bit_cte = 1;
 890                                break;
 891                        }
 892                }
 893        }
 894
 895        pp_header(fmt, abbrev, dmode, encoding, commit, &msg, sb);
 896        if (fmt != CMIT_FMT_ONELINE && !subject) {
 897                strbuf_addch(sb, '\n');
 898        }
 899
 900        /* Skip excess blank lines at the beginning of body, if any... */
 901        msg = skip_empty_lines(msg);
 902
 903        /* These formats treat the title line specially. */
 904        if (fmt == CMIT_FMT_ONELINE || fmt == CMIT_FMT_EMAIL)
 905                pp_title_line(fmt, &msg, sb, subject,
 906                              after_subject, encoding, need_8bit_cte);
 907
 908        beginning_of_body = sb->len;
 909        if (fmt != CMIT_FMT_ONELINE)
 910                pp_remainder(fmt, &msg, sb, indent);
 911        strbuf_rtrim(sb);
 912
 913        /* Make sure there is an EOLN for the non-oneline case */
 914        if (fmt != CMIT_FMT_ONELINE)
 915                strbuf_addch(sb, '\n');
 916
 917        /*
 918         * The caller may append additional body text in e-mail
 919         * format.  Make sure we did not strip the blank line
 920         * between the header and the body.
 921         */
 922        if (fmt == CMIT_FMT_EMAIL && sb->len <= beginning_of_body)
 923                strbuf_addch(sb, '\n');
 924        free(reencoded);
 925}