Andrew's git / gitweb.git / pretty.c
?
pretty.con commit pretty: factor out format_subject() (88c4473)
   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
  10static char *user_format;
  11
  12void get_commit_format(const char *arg, struct rev_info *rev)
  13{
  14        int i;
  15        static struct cmt_fmt_map {
  16                const char *n;
  17                size_t cmp_len;
  18                enum cmit_fmt v;
  19        } cmt_fmts[] = {
  20                { "raw",        1,      CMIT_FMT_RAW },
  21                { "medium",     1,      CMIT_FMT_MEDIUM },
  22                { "short",      1,      CMIT_FMT_SHORT },
  23                { "email",      1,      CMIT_FMT_EMAIL },
  24                { "full",       5,      CMIT_FMT_FULL },
  25                { "fuller",     5,      CMIT_FMT_FULLER },
  26                { "oneline",    1,      CMIT_FMT_ONELINE },
  27        };
  28
  29        rev->use_terminator = 0;
  30        if (!arg || !*arg) {
  31                rev->commit_format = CMIT_FMT_DEFAULT;
  32                return;
  33        }
  34        if (!prefixcmp(arg, "format:") || !prefixcmp(arg, "tformat:")) {
  35                const char *cp = strchr(arg, ':') + 1;
  36                free(user_format);
  37                user_format = xstrdup(cp);
  38                if (arg[0] == 't')
  39                        rev->use_terminator = 1;
  40                rev->commit_format = CMIT_FMT_USERFORMAT;
  41                return;
  42        }
  43        for (i = 0; i < ARRAY_SIZE(cmt_fmts); i++) {
  44                if (!strncmp(arg, cmt_fmts[i].n, cmt_fmts[i].cmp_len) &&
  45                    !strncmp(arg, cmt_fmts[i].n, strlen(arg))) {
  46                        if (cmt_fmts[i].v == CMIT_FMT_ONELINE)
  47                                rev->use_terminator = 1;
  48                        rev->commit_format = cmt_fmts[i].v;
  49                        return;
  50                }
  51        }
  52
  53        die("invalid --pretty format: %s", arg);
  54}
  55
  56/*
  57 * Generic support for pretty-printing the header
  58 */
  59static int get_one_line(const char *msg)
  60{
  61        int ret = 0;
  62
  63        for (;;) {
  64                char c = *msg++;
  65                if (!c)
  66                        break;
  67                ret++;
  68                if (c == '\n')
  69                        break;
  70        }
  71        return ret;
  72}
  73
  74/* High bit set, or ISO-2022-INT */
  75int non_ascii(int ch)
  76{
  77        ch = (ch & 0xff);
  78        return ((ch & 0x80) || (ch == 0x1b));
  79}
  80
  81static int is_rfc2047_special(char ch)
  82{
  83        return (non_ascii(ch) || (ch == '=') || (ch == '?') || (ch == '_'));
  84}
  85
  86static void add_rfc2047(struct strbuf *sb, const char *line, int len,
  87                       const char *encoding)
  88{
  89        int i, last;
  90
  91        for (i = 0; i < len; i++) {
  92                int ch = line[i];
  93                if (non_ascii(ch))
  94                        goto needquote;
  95                if ((i + 1 < len) && (ch == '=' && line[i+1] == '?'))
  96                        goto needquote;
  97        }
  98        strbuf_add(sb, line, len);
  99        return;
 100
 101needquote:
 102        strbuf_grow(sb, len * 3 + strlen(encoding) + 100);
 103        strbuf_addf(sb, "=?%s?q?", encoding);
 104        for (i = last = 0; i < len; i++) {
 105                unsigned ch = line[i] & 0xFF;
 106                /*
 107                 * We encode ' ' using '=20' even though rfc2047
 108                 * allows using '_' for readability.  Unfortunately,
 109                 * many programs do not understand this and just
 110                 * leave the underscore in place.
 111                 */
 112                if (is_rfc2047_special(ch) || ch == ' ') {
 113                        strbuf_add(sb, line + last, i - last);
 114                        strbuf_addf(sb, "=%02X", ch);
 115                        last = i + 1;
 116                }
 117        }
 118        strbuf_add(sb, line + last, len - last);
 119        strbuf_addstr(sb, "?=");
 120}
 121
 122void pp_user_info(const char *what, enum cmit_fmt fmt, struct strbuf *sb,
 123                  const char *line, enum date_mode dmode,
 124                  const char *encoding)
 125{
 126        char *date;
 127        int namelen;
 128        unsigned long time;
 129        int tz;
 130        const char *filler = "    ";
 131
 132        if (fmt == CMIT_FMT_ONELINE)
 133                return;
 134        date = strchr(line, '>');
 135        if (!date)
 136                return;
 137        namelen = ++date - line;
 138        time = strtoul(date, &date, 10);
 139        tz = strtol(date, NULL, 10);
 140
 141        if (fmt == CMIT_FMT_EMAIL) {
 142                char *name_tail = strchr(line, '<');
 143                int display_name_length;
 144                if (!name_tail)
 145                        return;
 146                while (line < name_tail && isspace(name_tail[-1]))
 147                        name_tail--;
 148                display_name_length = name_tail - line;
 149                filler = "";
 150                strbuf_addstr(sb, "From: ");
 151                add_rfc2047(sb, line, display_name_length, encoding);
 152                strbuf_add(sb, name_tail, namelen - display_name_length);
 153                strbuf_addch(sb, '\n');
 154        } else {
 155                strbuf_addf(sb, "%s: %.*s%.*s\n", what,
 156                              (fmt == CMIT_FMT_FULLER) ? 4 : 0,
 157                              filler, namelen, line);
 158        }
 159        switch (fmt) {
 160        case CMIT_FMT_MEDIUM:
 161                strbuf_addf(sb, "Date:   %s\n", show_date(time, tz, dmode));
 162                break;
 163        case CMIT_FMT_EMAIL:
 164                strbuf_addf(sb, "Date: %s\n", show_date(time, tz, DATE_RFC2822));
 165                break;
 166        case CMIT_FMT_FULLER:
 167                strbuf_addf(sb, "%sDate: %s\n", what, show_date(time, tz, dmode));
 168                break;
 169        default:
 170                /* notin' */
 171                break;
 172        }
 173}
 174
 175static int is_empty_line(const char *line, int *len_p)
 176{
 177        int len = *len_p;
 178        while (len && isspace(line[len-1]))
 179                len--;
 180        *len_p = len;
 181        return !len;
 182}
 183
 184static const char *skip_empty_lines(const char *msg)
 185{
 186        for (;;) {
 187                int linelen = get_one_line(msg);
 188                int ll = linelen;
 189                if (!linelen)
 190                        break;
 191                if (!is_empty_line(msg, &ll))
 192                        break;
 193                msg += linelen;
 194        }
 195        return msg;
 196}
 197
 198static void add_merge_info(enum cmit_fmt fmt, struct strbuf *sb,
 199                        const struct commit *commit, int abbrev)
 200{
 201        struct commit_list *parent = commit->parents;
 202
 203        if ((fmt == CMIT_FMT_ONELINE) || (fmt == CMIT_FMT_EMAIL) ||
 204            !parent || !parent->next)
 205                return;
 206
 207        strbuf_addstr(sb, "Merge:");
 208
 209        while (parent) {
 210                struct commit *p = parent->item;
 211                const char *hex = NULL;
 212                const char *dots;
 213                if (abbrev)
 214                        hex = find_unique_abbrev(p->object.sha1, abbrev);
 215                if (!hex)
 216                        hex = sha1_to_hex(p->object.sha1);
 217                dots = (abbrev && strlen(hex) != 40) ?  "..." : "";
 218                parent = parent->next;
 219
 220                strbuf_addf(sb, " %s%s", hex, dots);
 221        }
 222        strbuf_addch(sb, '\n');
 223}
 224
 225static char *get_header(const struct commit *commit, const char *key)
 226{
 227        int key_len = strlen(key);
 228        const char *line = commit->buffer;
 229
 230        for (;;) {
 231                const char *eol = strchr(line, '\n'), *next;
 232
 233                if (line == eol)
 234                        return NULL;
 235                if (!eol) {
 236                        eol = line + strlen(line);
 237                        next = NULL;
 238                } else
 239                        next = eol + 1;
 240                if (eol - line > key_len &&
 241                    !strncmp(line, key, key_len) &&
 242                    line[key_len] == ' ') {
 243                        return xmemdupz(line + key_len + 1, eol - line - key_len - 1);
 244                }
 245                line = next;
 246        }
 247}
 248
 249static char *replace_encoding_header(char *buf, const char *encoding)
 250{
 251        struct strbuf tmp = STRBUF_INIT;
 252        size_t start, len;
 253        char *cp = buf;
 254
 255        /* guess if there is an encoding header before a \n\n */
 256        while (strncmp(cp, "encoding ", strlen("encoding "))) {
 257                cp = strchr(cp, '\n');
 258                if (!cp || *++cp == '\n')
 259                        return buf;
 260        }
 261        start = cp - buf;
 262        cp = strchr(cp, '\n');
 263        if (!cp)
 264                return buf; /* should not happen but be defensive */
 265        len = cp + 1 - (buf + start);
 266
 267        strbuf_attach(&tmp, buf, strlen(buf), strlen(buf) + 1);
 268        if (is_encoding_utf8(encoding)) {
 269                /* we have re-coded to UTF-8; drop the header */
 270                strbuf_remove(&tmp, start, len);
 271        } else {
 272                /* just replaces XXXX in 'encoding XXXX\n' */
 273                strbuf_splice(&tmp, start + strlen("encoding "),
 274                                          len - strlen("encoding \n"),
 275                                          encoding, strlen(encoding));
 276        }
 277        return strbuf_detach(&tmp, NULL);
 278}
 279
 280static char *logmsg_reencode(const struct commit *commit,
 281                             const char *output_encoding)
 282{
 283        static const char *utf8 = "utf-8";
 284        const char *use_encoding;
 285        char *encoding;
 286        char *out;
 287
 288        if (!*output_encoding)
 289                return NULL;
 290        encoding = get_header(commit, "encoding");
 291        use_encoding = encoding ? encoding : utf8;
 292        if (!strcmp(use_encoding, output_encoding))
 293                if (encoding) /* we'll strip encoding header later */
 294                        out = xstrdup(commit->buffer);
 295                else
 296                        return NULL; /* nothing to do */
 297        else
 298                out = reencode_string(commit->buffer,
 299                                      output_encoding, use_encoding);
 300        if (out)
 301                out = replace_encoding_header(out, output_encoding);
 302
 303        free(encoding);
 304        return out;
 305}
 306
 307static int mailmap_name(struct strbuf *sb, const char *email)
 308{
 309        static struct string_list *mail_map;
 310        char buffer[1024];
 311
 312        if (!mail_map) {
 313                mail_map = xcalloc(1, sizeof(*mail_map));
 314                read_mailmap(mail_map, ".mailmap", NULL);
 315        }
 316
 317        if (!mail_map->nr)
 318                return -1;
 319
 320        if (!map_email(mail_map, email, buffer, sizeof(buffer)))
 321                return -1;
 322        strbuf_addstr(sb, buffer);
 323        return 0;
 324}
 325
 326static size_t format_person_part(struct strbuf *sb, char part,
 327                                 const char *msg, int len, enum date_mode dmode)
 328{
 329        /* currently all placeholders have same length */
 330        const int placeholder_len = 2;
 331        int start, end, tz = 0;
 332        unsigned long date = 0;
 333        char *ep;
 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        if (part == 'n' || part == 'N') {       /* name */
 348                while (end > 0 && isspace(msg[end - 1]))
 349                        end--;
 350                if (part != 'N' || !msg[end] || !msg[end + 1] ||
 351                    mailmap_name(sb, msg + end + 2) < 0)
 352                        strbuf_add(sb, msg, end);
 353                return placeholder_len;
 354        }
 355        start = ++end; /* save email start position */
 356
 357        /* advance 'end' to point to email end delimiter */
 358        for ( ; end < len && msg[end] != '>'; end++)
 359                ; /* do nothing */
 360
 361        if (end >= len)
 362                goto skip;
 363
 364        if (part == 'e') {      /* email */
 365                strbuf_add(sb, msg + start, end - start);
 366                return placeholder_len;
 367        }
 368
 369        /* advance 'start' to point to date start delimiter */
 370        for (start = end + 1; start < len && isspace(msg[start]); start++)
 371                ; /* do nothing */
 372        if (start >= len)
 373                goto skip;
 374        date = strtoul(msg + start, &ep, 10);
 375        if (msg + start == ep)
 376                goto skip;
 377
 378        if (part == 't') {      /* date, UNIX timestamp */
 379                strbuf_add(sb, msg + start, ep - (msg + start));
 380                return placeholder_len;
 381        }
 382
 383        /* parse tz */
 384        for (start = ep - msg + 1; start < len && isspace(msg[start]); start++)
 385                ; /* do nothing */
 386        if (start + 1 < len) {
 387                tz = strtoul(msg + start + 1, NULL, 10);
 388                if (msg[start] == '-')
 389                        tz = -tz;
 390        }
 391
 392        switch (part) {
 393        case 'd':       /* date */
 394                strbuf_addstr(sb, show_date(date, tz, dmode));
 395                return placeholder_len;
 396        case 'D':       /* date, RFC2822 style */
 397                strbuf_addstr(sb, show_date(date, tz, DATE_RFC2822));
 398                return placeholder_len;
 399        case 'r':       /* date, relative */
 400                strbuf_addstr(sb, show_date(date, tz, DATE_RELATIVE));
 401                return placeholder_len;
 402        case 'i':       /* date, ISO 8601 */
 403                strbuf_addstr(sb, show_date(date, tz, DATE_ISO8601));
 404                return placeholder_len;
 405        }
 406
 407skip:
 408        /*
 409         * bogus commit, 'sb' cannot be updated, but we still need to
 410         * compute a valid return value.
 411         */
 412        if (part == 'n' || part == 'e' || part == 't' || part == 'd'
 413            || part == 'D' || part == 'r' || part == 'i')
 414                return placeholder_len;
 415
 416        return 0; /* unknown placeholder */
 417}
 418
 419struct chunk {
 420        size_t off;
 421        size_t len;
 422};
 423
 424struct format_commit_context {
 425        const struct commit *commit;
 426        enum date_mode dmode;
 427
 428        /* These offsets are relative to the start of the commit message. */
 429        int commit_header_parsed;
 430        struct chunk subject;
 431        struct chunk author;
 432        struct chunk committer;
 433        struct chunk encoding;
 434        size_t body_off;
 435
 436        /* The following ones are relative to the result struct strbuf. */
 437        struct chunk abbrev_commit_hash;
 438        struct chunk abbrev_tree_hash;
 439        struct chunk abbrev_parent_hashes;
 440};
 441
 442static int add_again(struct strbuf *sb, struct chunk *chunk)
 443{
 444        if (chunk->len) {
 445                strbuf_adddup(sb, chunk->off, chunk->len);
 446                return 1;
 447        }
 448
 449        /*
 450         * We haven't seen this chunk before.  Our caller is surely
 451         * going to add it the hard way now.  Remember the most likely
 452         * start of the to-be-added chunk: the current end of the
 453         * struct strbuf.
 454         */
 455        chunk->off = sb->len;
 456        return 0;
 457}
 458
 459static void parse_commit_header(struct format_commit_context *context)
 460{
 461        const char *msg = context->commit->buffer;
 462        int i;
 463        enum { HEADER, SUBJECT, BODY } state;
 464
 465        for (i = 0, state = HEADER; msg[i] && state < BODY; i++) {
 466                int eol;
 467                for (eol = i; msg[eol] && msg[eol] != '\n'; eol++)
 468                        ; /* do nothing */
 469
 470                if (state == SUBJECT) {
 471                        context->subject.off = i;
 472                        context->subject.len = eol - i;
 473                        i = eol;
 474                }
 475                if (i == eol) {
 476                        state++;
 477                        /* strip empty lines */
 478                        while (msg[eol] == '\n' && msg[eol + 1] == '\n')
 479                                eol++;
 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                if (!msg[i])
 492                        break;
 493        }
 494        context->body_off = i;
 495        context->commit_header_parsed = 1;
 496}
 497
 498static const 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                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 format_decoration(struct strbuf *sb, const struct commit *commit)
 521{
 522        struct name_decoration *d;
 523        const char *prefix = " (";
 524
 525        load_ref_decorations();
 526        d = lookup_decoration(&name_decoration, &commit->object);
 527        while (d) {
 528                strbuf_addstr(sb, prefix);
 529                prefix = ", ";
 530                strbuf_addstr(sb, d->name);
 531                d = d->next;
 532        }
 533        if (prefix[0] == ',')
 534                strbuf_addch(sb, ')');
 535}
 536
 537static size_t format_commit_item(struct strbuf *sb, const char *placeholder,
 538                               void *context)
 539{
 540        struct format_commit_context *c = context;
 541        const struct commit *commit = c->commit;
 542        const char *msg = commit->buffer;
 543        struct commit_list *p;
 544        int h1, h2;
 545
 546        /* these are independent of the commit */
 547        switch (placeholder[0]) {
 548        case 'C':
 549                if (!prefixcmp(placeholder + 1, "red")) {
 550                        strbuf_addstr(sb, "\033[31m");
 551                        return 4;
 552                } else if (!prefixcmp(placeholder + 1, "green")) {
 553                        strbuf_addstr(sb, "\033[32m");
 554                        return 6;
 555                } else if (!prefixcmp(placeholder + 1, "blue")) {
 556                        strbuf_addstr(sb, "\033[34m");
 557                        return 5;
 558                } else if (!prefixcmp(placeholder + 1, "reset")) {
 559                        strbuf_addstr(sb, "\033[m");
 560                        return 6;
 561                } else
 562                        return 0;
 563        case 'n':               /* newline */
 564                strbuf_addch(sb, '\n');
 565                return 1;
 566        case 'x':
 567                /* %x00 == NUL, %x0a == LF, etc. */
 568                if (0 <= (h1 = hexval_table[0xff & placeholder[1]]) &&
 569                    h1 <= 16 &&
 570                    0 <= (h2 = hexval_table[0xff & placeholder[2]]) &&
 571                    h2 <= 16) {
 572                        strbuf_addch(sb, (h1<<4)|h2);
 573                        return 3;
 574                } else
 575                        return 0;
 576        }
 577
 578        /* these depend on the commit */
 579        if (!commit->object.parsed)
 580                parse_object(commit->object.sha1);
 581
 582        switch (placeholder[0]) {
 583        case 'H':               /* commit hash */
 584                strbuf_addstr(sb, sha1_to_hex(commit->object.sha1));
 585                return 1;
 586        case 'h':               /* abbreviated commit hash */
 587                if (add_again(sb, &c->abbrev_commit_hash))
 588                        return 1;
 589                strbuf_addstr(sb, find_unique_abbrev(commit->object.sha1,
 590                                                     DEFAULT_ABBREV));
 591                c->abbrev_commit_hash.len = sb->len - c->abbrev_commit_hash.off;
 592                return 1;
 593        case 'T':               /* tree hash */
 594                strbuf_addstr(sb, sha1_to_hex(commit->tree->object.sha1));
 595                return 1;
 596        case 't':               /* abbreviated tree hash */
 597                if (add_again(sb, &c->abbrev_tree_hash))
 598                        return 1;
 599                strbuf_addstr(sb, find_unique_abbrev(commit->tree->object.sha1,
 600                                                     DEFAULT_ABBREV));
 601                c->abbrev_tree_hash.len = sb->len - c->abbrev_tree_hash.off;
 602                return 1;
 603        case 'P':               /* parent hashes */
 604                for (p = commit->parents; p; p = p->next) {
 605                        if (p != commit->parents)
 606                                strbuf_addch(sb, ' ');
 607                        strbuf_addstr(sb, sha1_to_hex(p->item->object.sha1));
 608                }
 609                return 1;
 610        case 'p':               /* abbreviated parent hashes */
 611                if (add_again(sb, &c->abbrev_parent_hashes))
 612                        return 1;
 613                for (p = commit->parents; p; p = p->next) {
 614                        if (p != commit->parents)
 615                                strbuf_addch(sb, ' ');
 616                        strbuf_addstr(sb, find_unique_abbrev(
 617                                        p->item->object.sha1, DEFAULT_ABBREV));
 618                }
 619                c->abbrev_parent_hashes.len = sb->len -
 620                                              c->abbrev_parent_hashes.off;
 621                return 1;
 622        case 'm':               /* left/right/bottom */
 623                strbuf_addch(sb, (commit->object.flags & BOUNDARY)
 624                                 ? '-'
 625                                 : (commit->object.flags & SYMMETRIC_LEFT)
 626                                 ? '<'
 627                                 : '>');
 628                return 1;
 629        case 'd':
 630                format_decoration(sb, commit);
 631                return 1;
 632        }
 633
 634        /* For the rest we have to parse the commit header. */
 635        if (!c->commit_header_parsed)
 636                parse_commit_header(c);
 637
 638        switch (placeholder[0]) {
 639        case 's':       /* subject */
 640                strbuf_add(sb, msg + c->subject.off, c->subject.len);
 641                return 1;
 642        case 'a':       /* author ... */
 643                return format_person_part(sb, placeholder[1],
 644                                   msg + c->author.off, c->author.len,
 645                                   c->dmode);
 646        case 'c':       /* committer ... */
 647                return format_person_part(sb, placeholder[1],
 648                                   msg + c->committer.off, c->committer.len,
 649                                   c->dmode);
 650        case 'e':       /* encoding */
 651                strbuf_add(sb, msg + c->encoding.off, c->encoding.len);
 652                return 1;
 653        case 'b':       /* body */
 654                strbuf_addstr(sb, msg + c->body_off);
 655                return 1;
 656        }
 657        return 0;       /* unknown placeholder */
 658}
 659
 660void format_commit_message(const struct commit *commit,
 661                           const void *format, struct strbuf *sb,
 662                           enum date_mode dmode)
 663{
 664        struct format_commit_context context;
 665
 666        memset(&context, 0, sizeof(context));
 667        context.commit = commit;
 668        context.dmode = dmode;
 669        strbuf_expand(sb, format, format_commit_item, &context);
 670}
 671
 672static void pp_header(enum cmit_fmt fmt,
 673                      int abbrev,
 674                      enum date_mode dmode,
 675                      const char *encoding,
 676                      const struct commit *commit,
 677                      const char **msg_p,
 678                      struct strbuf *sb)
 679{
 680        int parents_shown = 0;
 681
 682        for (;;) {
 683                const char *line = *msg_p;
 684                int linelen = get_one_line(*msg_p);
 685
 686                if (!linelen)
 687                        return;
 688                *msg_p += linelen;
 689
 690                if (linelen == 1)
 691                        /* End of header */
 692                        return;
 693
 694                if (fmt == CMIT_FMT_RAW) {
 695                        strbuf_add(sb, line, linelen);
 696                        continue;
 697                }
 698
 699                if (!memcmp(line, "parent ", 7)) {
 700                        if (linelen != 48)
 701                                die("bad parent line in commit");
 702                        continue;
 703                }
 704
 705                if (!parents_shown) {
 706                        struct commit_list *parent;
 707                        int num;
 708                        for (parent = commit->parents, num = 0;
 709                             parent;
 710                             parent = parent->next, num++)
 711                                ;
 712                        /* with enough slop */
 713                        strbuf_grow(sb, num * 50 + 20);
 714                        add_merge_info(fmt, sb, commit, abbrev);
 715                        parents_shown = 1;
 716                }
 717
 718                /*
 719                 * MEDIUM == DEFAULT shows only author with dates.
 720                 * FULL shows both authors but not dates.
 721                 * FULLER shows both authors and dates.
 722                 */
 723                if (!memcmp(line, "author ", 7)) {
 724                        strbuf_grow(sb, linelen + 80);
 725                        pp_user_info("Author", fmt, sb, line + 7, dmode, encoding);
 726                }
 727                if (!memcmp(line, "committer ", 10) &&
 728                    (fmt == CMIT_FMT_FULL || fmt == CMIT_FMT_FULLER)) {
 729                        strbuf_grow(sb, linelen + 80);
 730                        pp_user_info("Commit", fmt, sb, line + 10, dmode, encoding);
 731                }
 732        }
 733}
 734
 735void pp_title_line(enum cmit_fmt fmt,
 736                   const char **msg_p,
 737                   struct strbuf *sb,
 738                   const char *subject,
 739                   const char *after_subject,
 740                   const char *encoding,
 741                   int need_8bit_cte)
 742{
 743        const char *line_separator = (fmt == CMIT_FMT_EMAIL) ? "\n " : " ";
 744        struct strbuf title;
 745
 746        strbuf_init(&title, 80);
 747        *msg_p = format_subject(&title, *msg_p, line_separator);
 748
 749        strbuf_grow(sb, title.len + 1024);
 750        if (subject) {
 751                strbuf_addstr(sb, subject);
 752                add_rfc2047(sb, title.buf, title.len, encoding);
 753        } else {
 754                strbuf_addbuf(sb, &title);
 755        }
 756        strbuf_addch(sb, '\n');
 757
 758        if (need_8bit_cte > 0) {
 759                const char *header_fmt =
 760                        "MIME-Version: 1.0\n"
 761                        "Content-Type: text/plain; charset=%s\n"
 762                        "Content-Transfer-Encoding: 8bit\n";
 763                strbuf_addf(sb, header_fmt, encoding);
 764        }
 765        if (after_subject) {
 766                strbuf_addstr(sb, after_subject);
 767        }
 768        if (fmt == CMIT_FMT_EMAIL) {
 769                strbuf_addch(sb, '\n');
 770        }
 771        strbuf_release(&title);
 772}
 773
 774void pp_remainder(enum cmit_fmt fmt,
 775                  const char **msg_p,
 776                  struct strbuf *sb,
 777                  int indent)
 778{
 779        int first = 1;
 780        for (;;) {
 781                const char *line = *msg_p;
 782                int linelen = get_one_line(line);
 783                *msg_p += linelen;
 784
 785                if (!linelen)
 786                        break;
 787
 788                if (is_empty_line(line, &linelen)) {
 789                        if (first)
 790                                continue;
 791                        if (fmt == CMIT_FMT_SHORT)
 792                                break;
 793                }
 794                first = 0;
 795
 796                strbuf_grow(sb, linelen + indent + 20);
 797                if (indent) {
 798                        memset(sb->buf + sb->len, ' ', indent);
 799                        strbuf_setlen(sb, sb->len + indent);
 800                }
 801                strbuf_add(sb, line, linelen);
 802                strbuf_addch(sb, '\n');
 803        }
 804}
 805
 806char *reencode_commit_message(const struct commit *commit, const char **encoding_p)
 807{
 808        const char *encoding;
 809
 810        encoding = (git_log_output_encoding
 811                    ? git_log_output_encoding
 812                    : git_commit_encoding);
 813        if (!encoding)
 814                encoding = "utf-8";
 815        if (encoding_p)
 816                *encoding_p = encoding;
 817        return logmsg_reencode(commit, encoding);
 818}
 819
 820void pretty_print_commit(enum cmit_fmt fmt, const struct commit *commit,
 821                         struct strbuf *sb, int abbrev,
 822                         const char *subject, const char *after_subject,
 823                         enum date_mode dmode, int need_8bit_cte)
 824{
 825        unsigned long beginning_of_body;
 826        int indent = 4;
 827        const char *msg = commit->buffer;
 828        char *reencoded;
 829        const char *encoding;
 830
 831        if (fmt == CMIT_FMT_USERFORMAT) {
 832                format_commit_message(commit, user_format, sb, dmode);
 833                return;
 834        }
 835
 836        reencoded = reencode_commit_message(commit, &encoding);
 837        if (reencoded) {
 838                msg = reencoded;
 839        }
 840
 841        if (fmt == CMIT_FMT_ONELINE || fmt == CMIT_FMT_EMAIL)
 842                indent = 0;
 843
 844        /*
 845         * We need to check and emit Content-type: to mark it
 846         * as 8-bit if we haven't done so.
 847         */
 848        if (fmt == CMIT_FMT_EMAIL && need_8bit_cte == 0) {
 849                int i, ch, in_body;
 850
 851                for (in_body = i = 0; (ch = msg[i]); i++) {
 852                        if (!in_body) {
 853                                /* author could be non 7-bit ASCII but
 854                                 * the log may be so; skip over the
 855                                 * header part first.
 856                                 */
 857                                if (ch == '\n' && msg[i+1] == '\n')
 858                                        in_body = 1;
 859                        }
 860                        else if (non_ascii(ch)) {
 861                                need_8bit_cte = 1;
 862                                break;
 863                        }
 864                }
 865        }
 866
 867        pp_header(fmt, abbrev, dmode, encoding, commit, &msg, sb);
 868        if (fmt != CMIT_FMT_ONELINE && !subject) {
 869                strbuf_addch(sb, '\n');
 870        }
 871
 872        /* Skip excess blank lines at the beginning of body, if any... */
 873        msg = skip_empty_lines(msg);
 874
 875        /* These formats treat the title line specially. */
 876        if (fmt == CMIT_FMT_ONELINE || fmt == CMIT_FMT_EMAIL)
 877                pp_title_line(fmt, &msg, sb, subject,
 878                              after_subject, encoding, need_8bit_cte);
 879
 880        beginning_of_body = sb->len;
 881        if (fmt != CMIT_FMT_ONELINE)
 882                pp_remainder(fmt, &msg, sb, indent);
 883        strbuf_rtrim(sb);
 884
 885        /* Make sure there is an EOLN for the non-oneline case */
 886        if (fmt != CMIT_FMT_ONELINE)
 887                strbuf_addch(sb, '\n');
 888
 889        /*
 890         * The caller may append additional body text in e-mail
 891         * format.  Make sure we did not strip the blank line
 892         * between the header and the body.
 893         */
 894        if (fmt == CMIT_FMT_EMAIL && sb->len <= beginning_of_body)
 895                strbuf_addch(sb, '\n');
 896        free(reencoded);
 897}