Andrew's git / gitweb.git / pretty.c
?
pretty.con commit Merge branch 'maint' (eed1fcd)
   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
 139        if (fmt == CMIT_FMT_ONELINE)
 140                return;
 141        date = strchr(line, '>');
 142        if (!date)
 143                return;
 144        namelen = ++date - line;
 145        time = strtoul(date, &date, 10);
 146        tz = strtol(date, NULL, 10);
 147
 148        if (fmt == CMIT_FMT_EMAIL) {
 149                char *name_tail = strchr(line, '<');
 150                int display_name_length;
 151                if (!name_tail)
 152                        return;
 153                while (line < name_tail && isspace(name_tail[-1]))
 154                        name_tail--;
 155                display_name_length = name_tail - line;
 156                strbuf_addstr(sb, "From: ");
 157                add_rfc2047(sb, line, display_name_length, encoding);
 158                strbuf_add(sb, name_tail, namelen - display_name_length);
 159                strbuf_addch(sb, '\n');
 160        } else {
 161                strbuf_addf(sb, "%s: %.*s%.*s\n", what,
 162                              (fmt == CMIT_FMT_FULLER) ? 4 : 0,
 163                              "    ", namelen, line);
 164        }
 165        switch (fmt) {
 166        case CMIT_FMT_MEDIUM:
 167                strbuf_addf(sb, "Date:   %s\n", show_date(time, tz, dmode));
 168                break;
 169        case CMIT_FMT_EMAIL:
 170                strbuf_addf(sb, "Date: %s\n", show_date(time, tz, DATE_RFC2822));
 171                break;
 172        case CMIT_FMT_FULLER:
 173                strbuf_addf(sb, "%sDate: %s\n", what, show_date(time, tz, dmode));
 174                break;
 175        default:
 176                /* notin' */
 177                break;
 178        }
 179}
 180
 181static int is_empty_line(const char *line, int *len_p)
 182{
 183        int len = *len_p;
 184        while (len && isspace(line[len-1]))
 185                len--;
 186        *len_p = len;
 187        return !len;
 188}
 189
 190static const char *skip_empty_lines(const char *msg)
 191{
 192        for (;;) {
 193                int linelen = get_one_line(msg);
 194                int ll = linelen;
 195                if (!linelen)
 196                        break;
 197                if (!is_empty_line(msg, &ll))
 198                        break;
 199                msg += linelen;
 200        }
 201        return msg;
 202}
 203
 204static void add_merge_info(enum cmit_fmt fmt, struct strbuf *sb,
 205                        const struct commit *commit, int abbrev)
 206{
 207        struct commit_list *parent = commit->parents;
 208
 209        if ((fmt == CMIT_FMT_ONELINE) || (fmt == CMIT_FMT_EMAIL) ||
 210            !parent || !parent->next)
 211                return;
 212
 213        strbuf_addstr(sb, "Merge:");
 214
 215        while (parent) {
 216                struct commit *p = parent->item;
 217                const char *hex = NULL;
 218                if (abbrev)
 219                        hex = find_unique_abbrev(p->object.sha1, abbrev);
 220                if (!hex)
 221                        hex = sha1_to_hex(p->object.sha1);
 222                parent = parent->next;
 223
 224                strbuf_addf(sb, " %s", hex);
 225        }
 226        strbuf_addch(sb, '\n');
 227}
 228
 229static char *get_header(const struct commit *commit, const char *key)
 230{
 231        int key_len = strlen(key);
 232        const char *line = commit->buffer;
 233
 234        for (;;) {
 235                const char *eol = strchr(line, '\n'), *next;
 236
 237                if (line == eol)
 238                        return NULL;
 239                if (!eol) {
 240                        eol = line + strlen(line);
 241                        next = NULL;
 242                } else
 243                        next = eol + 1;
 244                if (eol - line > key_len &&
 245                    !strncmp(line, key, key_len) &&
 246                    line[key_len] == ' ') {
 247                        return xmemdupz(line + key_len + 1, eol - line - key_len - 1);
 248                }
 249                line = next;
 250        }
 251}
 252
 253static char *replace_encoding_header(char *buf, const char *encoding)
 254{
 255        struct strbuf tmp = STRBUF_INIT;
 256        size_t start, len;
 257        char *cp = buf;
 258
 259        /* guess if there is an encoding header before a \n\n */
 260        while (strncmp(cp, "encoding ", strlen("encoding "))) {
 261                cp = strchr(cp, '\n');
 262                if (!cp || *++cp == '\n')
 263                        return buf;
 264        }
 265        start = cp - buf;
 266        cp = strchr(cp, '\n');
 267        if (!cp)
 268                return buf; /* should not happen but be defensive */
 269        len = cp + 1 - (buf + start);
 270
 271        strbuf_attach(&tmp, buf, strlen(buf), strlen(buf) + 1);
 272        if (is_encoding_utf8(encoding)) {
 273                /* we have re-coded to UTF-8; drop the header */
 274                strbuf_remove(&tmp, start, len);
 275        } else {
 276                /* just replaces XXXX in 'encoding XXXX\n' */
 277                strbuf_splice(&tmp, start + strlen("encoding "),
 278                                          len - strlen("encoding \n"),
 279                                          encoding, strlen(encoding));
 280        }
 281        return strbuf_detach(&tmp, NULL);
 282}
 283
 284static char *logmsg_reencode(const struct commit *commit,
 285                             const char *output_encoding)
 286{
 287        static const char *utf8 = "utf-8";
 288        const char *use_encoding;
 289        char *encoding;
 290        char *out;
 291
 292        if (!*output_encoding)
 293                return NULL;
 294        encoding = get_header(commit, "encoding");
 295        use_encoding = encoding ? encoding : utf8;
 296        if (!strcmp(use_encoding, output_encoding))
 297                if (encoding) /* we'll strip encoding header later */
 298                        out = xstrdup(commit->buffer);
 299                else
 300                        return NULL; /* nothing to do */
 301        else
 302                out = reencode_string(commit->buffer,
 303                                      output_encoding, use_encoding);
 304        if (out)
 305                out = replace_encoding_header(out, output_encoding);
 306
 307        free(encoding);
 308        return out;
 309}
 310
 311static int mailmap_name(char *email, int email_len, char *name, int name_len)
 312{
 313        static struct string_list *mail_map;
 314        if (!mail_map) {
 315                mail_map = xcalloc(1, sizeof(*mail_map));
 316                read_mailmap(mail_map, NULL);
 317        }
 318        return mail_map->nr && map_user(mail_map, email, email_len, name, name_len);
 319}
 320
 321static size_t format_person_part(struct strbuf *sb, char part,
 322                                 const char *msg, int len, enum date_mode dmode)
 323{
 324        /* currently all placeholders have same length */
 325        const int placeholder_len = 2;
 326        int start, end, tz = 0;
 327        unsigned long date = 0;
 328        char *ep;
 329        const char *name_start, *name_end, *mail_start, *mail_end, *msg_end = msg+len;
 330        char person_name[1024];
 331        char person_mail[1024];
 332
 333        /* advance 'end' to point to email start delimiter */
 334        for (end = 0; end < len && msg[end] != '<'; end++)
 335                ; /* do nothing */
 336
 337        /*
 338         * When end points at the '<' that we found, it should have
 339         * matching '>' later, which means 'end' must be strictly
 340         * below len - 1.
 341         */
 342        if (end >= len - 2)
 343                goto skip;
 344
 345        /* Seek for both name and email part */
 346        name_start = msg;
 347        name_end = msg+end;
 348        while (name_end > name_start && isspace(*(name_end-1)))
 349                name_end--;
 350        mail_start = msg+end+1;
 351        mail_end = mail_start;
 352        while (mail_end < msg_end && *mail_end != '>')
 353                mail_end++;
 354        if (mail_end == msg_end)
 355                goto skip;
 356        end = mail_end-msg;
 357
 358        if (part == 'N' || part == 'E') { /* mailmap lookup */
 359                strlcpy(person_name, name_start, name_end-name_start+1);
 360                strlcpy(person_mail, mail_start, mail_end-mail_start+1);
 361                mailmap_name(person_mail, sizeof(person_mail), person_name, sizeof(person_name));
 362                name_start = person_name;
 363                name_end = name_start + strlen(person_name);
 364                mail_start = person_mail;
 365                mail_end = mail_start +  strlen(person_mail);
 366        }
 367        if (part == 'n' || part == 'N') {       /* name */
 368                strbuf_add(sb, name_start, name_end-name_start);
 369                return placeholder_len;
 370        }
 371        if (part == 'e' || part == 'E') {       /* email */
 372                strbuf_add(sb, mail_start, mail_end-mail_start);
 373                return placeholder_len;
 374        }
 375
 376        /* advance 'start' to point to date start delimiter */
 377        for (start = end + 1; start < len && isspace(msg[start]); start++)
 378                ; /* do nothing */
 379        if (start >= len)
 380                goto skip;
 381        date = strtoul(msg + start, &ep, 10);
 382        if (msg + start == ep)
 383                goto skip;
 384
 385        if (part == 't') {      /* date, UNIX timestamp */
 386                strbuf_add(sb, msg + start, ep - (msg + start));
 387                return placeholder_len;
 388        }
 389
 390        /* parse tz */
 391        for (start = ep - msg + 1; start < len && isspace(msg[start]); start++)
 392                ; /* do nothing */
 393        if (start + 1 < len) {
 394                tz = strtoul(msg + start + 1, NULL, 10);
 395                if (msg[start] == '-')
 396                        tz = -tz;
 397        }
 398
 399        switch (part) {
 400        case 'd':       /* date */
 401                strbuf_addstr(sb, show_date(date, tz, dmode));
 402                return placeholder_len;
 403        case 'D':       /* date, RFC2822 style */
 404                strbuf_addstr(sb, show_date(date, tz, DATE_RFC2822));
 405                return placeholder_len;
 406        case 'r':       /* date, relative */
 407                strbuf_addstr(sb, show_date(date, tz, DATE_RELATIVE));
 408                return placeholder_len;
 409        case 'i':       /* date, ISO 8601 */
 410                strbuf_addstr(sb, show_date(date, tz, DATE_ISO8601));
 411                return placeholder_len;
 412        }
 413
 414skip:
 415        /*
 416         * bogus commit, 'sb' cannot be updated, but we still need to
 417         * compute a valid return value.
 418         */
 419        if (part == 'n' || part == 'e' || part == 't' || part == 'd'
 420            || part == 'D' || part == 'r' || part == 'i')
 421                return placeholder_len;
 422
 423        return 0; /* unknown placeholder */
 424}
 425
 426struct chunk {
 427        size_t off;
 428        size_t len;
 429};
 430
 431struct format_commit_context {
 432        const struct commit *commit;
 433        enum date_mode dmode;
 434        unsigned commit_header_parsed:1;
 435        unsigned commit_message_parsed:1;
 436
 437        /* These offsets are relative to the start of the commit message. */
 438        struct chunk author;
 439        struct chunk committer;
 440        struct chunk encoding;
 441        size_t message_off;
 442        size_t subject_off;
 443        size_t body_off;
 444
 445        /* The following ones are relative to the result struct strbuf. */
 446        struct chunk abbrev_commit_hash;
 447        struct chunk abbrev_tree_hash;
 448        struct chunk abbrev_parent_hashes;
 449};
 450
 451static int add_again(struct strbuf *sb, struct chunk *chunk)
 452{
 453        if (chunk->len) {
 454                strbuf_adddup(sb, chunk->off, chunk->len);
 455                return 1;
 456        }
 457
 458        /*
 459         * We haven't seen this chunk before.  Our caller is surely
 460         * going to add it the hard way now.  Remember the most likely
 461         * start of the to-be-added chunk: the current end of the
 462         * struct strbuf.
 463         */
 464        chunk->off = sb->len;
 465        return 0;
 466}
 467
 468static void parse_commit_header(struct format_commit_context *context)
 469{
 470        const char *msg = context->commit->buffer;
 471        int i;
 472
 473        for (i = 0; msg[i]; i++) {
 474                int eol;
 475                for (eol = i; msg[eol] && msg[eol] != '\n'; eol++)
 476                        ; /* do nothing */
 477
 478                if (i == eol) {
 479                        break;
 480                } else if (!prefixcmp(msg + i, "author ")) {
 481                        context->author.off = i + 7;
 482                        context->author.len = eol - i - 7;
 483                } else if (!prefixcmp(msg + i, "committer ")) {
 484                        context->committer.off = i + 10;
 485                        context->committer.len = eol - i - 10;
 486                } else if (!prefixcmp(msg + i, "encoding ")) {
 487                        context->encoding.off = i + 9;
 488                        context->encoding.len = eol - i - 9;
 489                }
 490                i = eol;
 491        }
 492        context->message_off = i;
 493        context->commit_header_parsed = 1;
 494}
 495
 496const char *format_subject(struct strbuf *sb, const char *msg,
 497                           const char *line_separator)
 498{
 499        int first = 1;
 500
 501        for (;;) {
 502                const char *line = msg;
 503                int linelen = get_one_line(line);
 504
 505                msg += linelen;
 506                if (!linelen || is_empty_line(line, &linelen))
 507                        break;
 508
 509                if (!sb)
 510                        continue;
 511                strbuf_grow(sb, linelen + 2);
 512                if (!first)
 513                        strbuf_addstr(sb, line_separator);
 514                strbuf_add(sb, line, linelen);
 515                first = 0;
 516        }
 517        return msg;
 518}
 519
 520static void parse_commit_message(struct format_commit_context *c)
 521{
 522        const char *msg = c->commit->buffer + c->message_off;
 523        const char *start = c->commit->buffer;
 524
 525        msg = skip_empty_lines(msg);
 526        c->subject_off = msg - start;
 527
 528        msg = format_subject(NULL, msg, NULL);
 529        msg = skip_empty_lines(msg);
 530        c->body_off = msg - start;
 531
 532        c->commit_message_parsed = 1;
 533}
 534
 535static void format_decoration(struct strbuf *sb, const struct commit *commit)
 536{
 537        struct name_decoration *d;
 538        const char *prefix = " (";
 539
 540        load_ref_decorations();
 541        d = lookup_decoration(&name_decoration, &commit->object);
 542        while (d) {
 543                strbuf_addstr(sb, prefix);
 544                prefix = ", ";
 545                strbuf_addstr(sb, d->name);
 546                d = d->next;
 547        }
 548        if (prefix[0] == ',')
 549                strbuf_addch(sb, ')');
 550}
 551
 552static size_t format_commit_item(struct strbuf *sb, const char *placeholder,
 553                               void *context)
 554{
 555        struct format_commit_context *c = context;
 556        const struct commit *commit = c->commit;
 557        const char *msg = commit->buffer;
 558        struct commit_list *p;
 559        int h1, h2;
 560
 561        /* these are independent of the commit */
 562        switch (placeholder[0]) {
 563        case 'C':
 564                if (placeholder[1] == '(') {
 565                        const char *end = strchr(placeholder + 2, ')');
 566                        char color[COLOR_MAXLEN];
 567                        if (!end)
 568                                return 0;
 569                        color_parse_mem(placeholder + 2,
 570                                        end - (placeholder + 2),
 571                                        "--pretty format", color);
 572                        strbuf_addstr(sb, color);
 573                        return end - placeholder + 1;
 574                }
 575                if (!prefixcmp(placeholder + 1, "red")) {
 576                        strbuf_addstr(sb, GIT_COLOR_RED);
 577                        return 4;
 578                } else if (!prefixcmp(placeholder + 1, "green")) {
 579                        strbuf_addstr(sb, GIT_COLOR_GREEN);
 580                        return 6;
 581                } else if (!prefixcmp(placeholder + 1, "blue")) {
 582                        strbuf_addstr(sb, GIT_COLOR_BLUE);
 583                        return 5;
 584                } else if (!prefixcmp(placeholder + 1, "reset")) {
 585                        strbuf_addstr(sb, GIT_COLOR_RESET);
 586                        return 6;
 587                } else
 588                        return 0;
 589        case 'n':               /* newline */
 590                strbuf_addch(sb, '\n');
 591                return 1;
 592        case 'x':
 593                /* %x00 == NUL, %x0a == LF, etc. */
 594                if (0 <= (h1 = hexval_table[0xff & placeholder[1]]) &&
 595                    h1 <= 16 &&
 596                    0 <= (h2 = hexval_table[0xff & placeholder[2]]) &&
 597                    h2 <= 16) {
 598                        strbuf_addch(sb, (h1<<4)|h2);
 599                        return 3;
 600                } else
 601                        return 0;
 602        }
 603
 604        /* these depend on the commit */
 605        if (!commit->object.parsed)
 606                parse_object(commit->object.sha1);
 607
 608        switch (placeholder[0]) {
 609        case 'H':               /* commit hash */
 610                strbuf_addstr(sb, sha1_to_hex(commit->object.sha1));
 611                return 1;
 612        case 'h':               /* abbreviated commit hash */
 613                if (add_again(sb, &c->abbrev_commit_hash))
 614                        return 1;
 615                strbuf_addstr(sb, find_unique_abbrev(commit->object.sha1,
 616                                                     DEFAULT_ABBREV));
 617                c->abbrev_commit_hash.len = sb->len - c->abbrev_commit_hash.off;
 618                return 1;
 619        case 'T':               /* tree hash */
 620                strbuf_addstr(sb, sha1_to_hex(commit->tree->object.sha1));
 621                return 1;
 622        case 't':               /* abbreviated tree hash */
 623                if (add_again(sb, &c->abbrev_tree_hash))
 624                        return 1;
 625                strbuf_addstr(sb, find_unique_abbrev(commit->tree->object.sha1,
 626                                                     DEFAULT_ABBREV));
 627                c->abbrev_tree_hash.len = sb->len - c->abbrev_tree_hash.off;
 628                return 1;
 629        case 'P':               /* parent hashes */
 630                for (p = commit->parents; p; p = p->next) {
 631                        if (p != commit->parents)
 632                                strbuf_addch(sb, ' ');
 633                        strbuf_addstr(sb, sha1_to_hex(p->item->object.sha1));
 634                }
 635                return 1;
 636        case 'p':               /* abbreviated parent hashes */
 637                if (add_again(sb, &c->abbrev_parent_hashes))
 638                        return 1;
 639                for (p = commit->parents; p; p = p->next) {
 640                        if (p != commit->parents)
 641                                strbuf_addch(sb, ' ');
 642                        strbuf_addstr(sb, find_unique_abbrev(
 643                                        p->item->object.sha1, DEFAULT_ABBREV));
 644                }
 645                c->abbrev_parent_hashes.len = sb->len -
 646                                              c->abbrev_parent_hashes.off;
 647                return 1;
 648        case 'm':               /* left/right/bottom */
 649                strbuf_addch(sb, (commit->object.flags & BOUNDARY)
 650                                 ? '-'
 651                                 : (commit->object.flags & SYMMETRIC_LEFT)
 652                                 ? '<'
 653                                 : '>');
 654                return 1;
 655        case 'd':
 656                format_decoration(sb, commit);
 657                return 1;
 658        }
 659
 660        /* For the rest we have to parse the commit header. */
 661        if (!c->commit_header_parsed)
 662                parse_commit_header(c);
 663
 664        switch (placeholder[0]) {
 665        case 'a':       /* author ... */
 666                return format_person_part(sb, placeholder[1],
 667                                   msg + c->author.off, c->author.len,
 668                                   c->dmode);
 669        case 'c':       /* committer ... */
 670                return format_person_part(sb, placeholder[1],
 671                                   msg + c->committer.off, c->committer.len,
 672                                   c->dmode);
 673        case 'e':       /* encoding */
 674                strbuf_add(sb, msg + c->encoding.off, c->encoding.len);
 675                return 1;
 676        }
 677
 678        /* Now we need to parse the commit message. */
 679        if (!c->commit_message_parsed)
 680                parse_commit_message(c);
 681
 682        switch (placeholder[0]) {
 683        case 's':       /* subject */
 684                format_subject(sb, msg + c->subject_off, " ");
 685                return 1;
 686        case 'b':       /* body */
 687                strbuf_addstr(sb, msg + c->body_off);
 688                return 1;
 689        }
 690        return 0;       /* unknown placeholder */
 691}
 692
 693void format_commit_message(const struct commit *commit,
 694                           const void *format, struct strbuf *sb,
 695                           enum date_mode dmode)
 696{
 697        struct format_commit_context context;
 698
 699        memset(&context, 0, sizeof(context));
 700        context.commit = commit;
 701        context.dmode = dmode;
 702        strbuf_expand(sb, format, format_commit_item, &context);
 703}
 704
 705static void pp_header(enum cmit_fmt fmt,
 706                      int abbrev,
 707                      enum date_mode dmode,
 708                      const char *encoding,
 709                      const struct commit *commit,
 710                      const char **msg_p,
 711                      struct strbuf *sb)
 712{
 713        int parents_shown = 0;
 714
 715        for (;;) {
 716                const char *line = *msg_p;
 717                int linelen = get_one_line(*msg_p);
 718
 719                if (!linelen)
 720                        return;
 721                *msg_p += linelen;
 722
 723                if (linelen == 1)
 724                        /* End of header */
 725                        return;
 726
 727                if (fmt == CMIT_FMT_RAW) {
 728                        strbuf_add(sb, line, linelen);
 729                        continue;
 730                }
 731
 732                if (!memcmp(line, "parent ", 7)) {
 733                        if (linelen != 48)
 734                                die("bad parent line in commit");
 735                        continue;
 736                }
 737
 738                if (!parents_shown) {
 739                        struct commit_list *parent;
 740                        int num;
 741                        for (parent = commit->parents, num = 0;
 742                             parent;
 743                             parent = parent->next, num++)
 744                                ;
 745                        /* with enough slop */
 746                        strbuf_grow(sb, num * 50 + 20);
 747                        add_merge_info(fmt, sb, commit, abbrev);
 748                        parents_shown = 1;
 749                }
 750
 751                /*
 752                 * MEDIUM == DEFAULT shows only author with dates.
 753                 * FULL shows both authors but not dates.
 754                 * FULLER shows both authors and dates.
 755                 */
 756                if (!memcmp(line, "author ", 7)) {
 757                        strbuf_grow(sb, linelen + 80);
 758                        pp_user_info("Author", fmt, sb, line + 7, dmode, encoding);
 759                }
 760                if (!memcmp(line, "committer ", 10) &&
 761                    (fmt == CMIT_FMT_FULL || fmt == CMIT_FMT_FULLER)) {
 762                        strbuf_grow(sb, linelen + 80);
 763                        pp_user_info("Commit", fmt, sb, line + 10, dmode, encoding);
 764                }
 765        }
 766}
 767
 768void pp_title_line(enum cmit_fmt fmt,
 769                   const char **msg_p,
 770                   struct strbuf *sb,
 771                   const char *subject,
 772                   const char *after_subject,
 773                   const char *encoding,
 774                   int need_8bit_cte)
 775{
 776        const char *line_separator = (fmt == CMIT_FMT_EMAIL) ? "\n " : " ";
 777        struct strbuf title;
 778
 779        strbuf_init(&title, 80);
 780        *msg_p = format_subject(&title, *msg_p, line_separator);
 781
 782        strbuf_grow(sb, title.len + 1024);
 783        if (subject) {
 784                strbuf_addstr(sb, subject);
 785                add_rfc2047(sb, title.buf, title.len, encoding);
 786        } else {
 787                strbuf_addbuf(sb, &title);
 788        }
 789        strbuf_addch(sb, '\n');
 790
 791        if (need_8bit_cte > 0) {
 792                const char *header_fmt =
 793                        "MIME-Version: 1.0\n"
 794                        "Content-Type: text/plain; charset=%s\n"
 795                        "Content-Transfer-Encoding: 8bit\n";
 796                strbuf_addf(sb, header_fmt, encoding);
 797        }
 798        if (after_subject) {
 799                strbuf_addstr(sb, after_subject);
 800        }
 801        if (fmt == CMIT_FMT_EMAIL) {
 802                strbuf_addch(sb, '\n');
 803        }
 804        strbuf_release(&title);
 805}
 806
 807void pp_remainder(enum cmit_fmt fmt,
 808                  const char **msg_p,
 809                  struct strbuf *sb,
 810                  int indent)
 811{
 812        int first = 1;
 813        for (;;) {
 814                const char *line = *msg_p;
 815                int linelen = get_one_line(line);
 816                *msg_p += linelen;
 817
 818                if (!linelen)
 819                        break;
 820
 821                if (is_empty_line(line, &linelen)) {
 822                        if (first)
 823                                continue;
 824                        if (fmt == CMIT_FMT_SHORT)
 825                                break;
 826                }
 827                first = 0;
 828
 829                strbuf_grow(sb, linelen + indent + 20);
 830                if (indent) {
 831                        memset(sb->buf + sb->len, ' ', indent);
 832                        strbuf_setlen(sb, sb->len + indent);
 833                }
 834                strbuf_add(sb, line, linelen);
 835                strbuf_addch(sb, '\n');
 836        }
 837}
 838
 839char *reencode_commit_message(const struct commit *commit, const char **encoding_p)
 840{
 841        const char *encoding;
 842
 843        encoding = (git_log_output_encoding
 844                    ? git_log_output_encoding
 845                    : git_commit_encoding);
 846        if (!encoding)
 847                encoding = "utf-8";
 848        if (encoding_p)
 849                *encoding_p = encoding;
 850        return logmsg_reencode(commit, encoding);
 851}
 852
 853void pretty_print_commit(enum cmit_fmt fmt, const struct commit *commit,
 854                         struct strbuf *sb, int abbrev,
 855                         const char *subject, const char *after_subject,
 856                         enum date_mode dmode, int need_8bit_cte)
 857{
 858        unsigned long beginning_of_body;
 859        int indent = 4;
 860        const char *msg = commit->buffer;
 861        char *reencoded;
 862        const char *encoding;
 863
 864        if (fmt == CMIT_FMT_USERFORMAT) {
 865                format_commit_message(commit, user_format, sb, dmode);
 866                return;
 867        }
 868
 869        reencoded = reencode_commit_message(commit, &encoding);
 870        if (reencoded) {
 871                msg = reencoded;
 872        }
 873
 874        if (fmt == CMIT_FMT_ONELINE || fmt == CMIT_FMT_EMAIL)
 875                indent = 0;
 876
 877        /*
 878         * We need to check and emit Content-type: to mark it
 879         * as 8-bit if we haven't done so.
 880         */
 881        if (fmt == CMIT_FMT_EMAIL && need_8bit_cte == 0) {
 882                int i, ch, in_body;
 883
 884                for (in_body = i = 0; (ch = msg[i]); i++) {
 885                        if (!in_body) {
 886                                /* author could be non 7-bit ASCII but
 887                                 * the log may be so; skip over the
 888                                 * header part first.
 889                                 */
 890                                if (ch == '\n' && msg[i+1] == '\n')
 891                                        in_body = 1;
 892                        }
 893                        else if (non_ascii(ch)) {
 894                                need_8bit_cte = 1;
 895                                break;
 896                        }
 897                }
 898        }
 899
 900        pp_header(fmt, abbrev, dmode, encoding, commit, &msg, sb);
 901        if (fmt != CMIT_FMT_ONELINE && !subject) {
 902                strbuf_addch(sb, '\n');
 903        }
 904
 905        /* Skip excess blank lines at the beginning of body, if any... */
 906        msg = skip_empty_lines(msg);
 907
 908        /* These formats treat the title line specially. */
 909        if (fmt == CMIT_FMT_ONELINE || fmt == CMIT_FMT_EMAIL)
 910                pp_title_line(fmt, &msg, sb, subject,
 911                              after_subject, encoding, need_8bit_cte);
 912
 913        beginning_of_body = sb->len;
 914        if (fmt != CMIT_FMT_ONELINE)
 915                pp_remainder(fmt, &msg, sb, indent);
 916        strbuf_rtrim(sb);
 917
 918        /* Make sure there is an EOLN for the non-oneline case */
 919        if (fmt != CMIT_FMT_ONELINE)
 920                strbuf_addch(sb, '\n');
 921
 922        /*
 923         * The caller may append additional body text in e-mail
 924         * format.  Make sure we did not strip the blank line
 925         * between the header and the body.
 926         */
 927        if (fmt == CMIT_FMT_EMAIL && sb->len <= beginning_of_body)
 928                strbuf_addch(sb, '\n');
 929        free(reencoded);
 930}