Andrew's git / gitweb.git / pretty.c
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pretty.con commit completion: More fixes to prevent unbound variable errors (5c9cc64)
   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                const char *dots;
 214                if (abbrev)
 215                        hex = find_unique_abbrev(p->object.sha1, abbrev);
 216                if (!hex)
 217                        hex = sha1_to_hex(p->object.sha1);
 218                dots = (abbrev && strlen(hex) != 40) ?  "..." : "";
 219                parent = parent->next;
 220
 221                strbuf_addf(sb, " %s%s", hex, dots);
 222        }
 223        strbuf_addch(sb, '\n');
 224}
 225
 226static char *get_header(const struct commit *commit, const char *key)
 227{
 228        int key_len = strlen(key);
 229        const char *line = commit->buffer;
 230
 231        for (;;) {
 232                const char *eol = strchr(line, '\n'), *next;
 233
 234                if (line == eol)
 235                        return NULL;
 236                if (!eol) {
 237                        eol = line + strlen(line);
 238                        next = NULL;
 239                } else
 240                        next = eol + 1;
 241                if (eol - line > key_len &&
 242                    !strncmp(line, key, key_len) &&
 243                    line[key_len] == ' ') {
 244                        return xmemdupz(line + key_len + 1, eol - line - key_len - 1);
 245                }
 246                line = next;
 247        }
 248}
 249
 250static char *replace_encoding_header(char *buf, const char *encoding)
 251{
 252        struct strbuf tmp = STRBUF_INIT;
 253        size_t start, len;
 254        char *cp = buf;
 255
 256        /* guess if there is an encoding header before a \n\n */
 257        while (strncmp(cp, "encoding ", strlen("encoding "))) {
 258                cp = strchr(cp, '\n');
 259                if (!cp || *++cp == '\n')
 260                        return buf;
 261        }
 262        start = cp - buf;
 263        cp = strchr(cp, '\n');
 264        if (!cp)
 265                return buf; /* should not happen but be defensive */
 266        len = cp + 1 - (buf + start);
 267
 268        strbuf_attach(&tmp, buf, strlen(buf), strlen(buf) + 1);
 269        if (is_encoding_utf8(encoding)) {
 270                /* we have re-coded to UTF-8; drop the header */
 271                strbuf_remove(&tmp, start, len);
 272        } else {
 273                /* just replaces XXXX in 'encoding XXXX\n' */
 274                strbuf_splice(&tmp, start + strlen("encoding "),
 275                                          len - strlen("encoding \n"),
 276                                          encoding, strlen(encoding));
 277        }
 278        return strbuf_detach(&tmp, NULL);
 279}
 280
 281static char *logmsg_reencode(const struct commit *commit,
 282                             const char *output_encoding)
 283{
 284        static const char *utf8 = "utf-8";
 285        const char *use_encoding;
 286        char *encoding;
 287        char *out;
 288
 289        if (!*output_encoding)
 290                return NULL;
 291        encoding = get_header(commit, "encoding");
 292        use_encoding = encoding ? encoding : utf8;
 293        if (!strcmp(use_encoding, output_encoding))
 294                if (encoding) /* we'll strip encoding header later */
 295                        out = xstrdup(commit->buffer);
 296                else
 297                        return NULL; /* nothing to do */
 298        else
 299                out = reencode_string(commit->buffer,
 300                                      output_encoding, use_encoding);
 301        if (out)
 302                out = replace_encoding_header(out, output_encoding);
 303
 304        free(encoding);
 305        return out;
 306}
 307
 308static int mailmap_name(struct strbuf *sb, const char *email)
 309{
 310        static struct string_list *mail_map;
 311        char buffer[1024];
 312
 313        if (!mail_map) {
 314                mail_map = xcalloc(1, sizeof(*mail_map));
 315                read_mailmap(mail_map, ".mailmap", NULL);
 316        }
 317
 318        if (!mail_map->nr)
 319                return -1;
 320
 321        if (!map_email(mail_map, email, buffer, sizeof(buffer)))
 322                return -1;
 323        strbuf_addstr(sb, buffer);
 324        return 0;
 325}
 326
 327static size_t format_person_part(struct strbuf *sb, char part,
 328                                 const char *msg, int len, enum date_mode dmode)
 329{
 330        /* currently all placeholders have same length */
 331        const int placeholder_len = 2;
 332        int start, end, tz = 0;
 333        unsigned long date = 0;
 334        char *ep;
 335
 336        /* advance 'end' to point to email start delimiter */
 337        for (end = 0; end < len && msg[end] != '<'; end++)
 338                ; /* do nothing */
 339
 340        /*
 341         * When end points at the '<' that we found, it should have
 342         * matching '>' later, which means 'end' must be strictly
 343         * below len - 1.
 344         */
 345        if (end >= len - 2)
 346                goto skip;
 347
 348        if (part == 'n' || part == 'N') {       /* name */
 349                while (end > 0 && isspace(msg[end - 1]))
 350                        end--;
 351                if (part != 'N' || !msg[end] || !msg[end + 1] ||
 352                    mailmap_name(sb, msg + end + 2) < 0)
 353                        strbuf_add(sb, msg, end);
 354                return placeholder_len;
 355        }
 356        start = ++end; /* save email start position */
 357
 358        /* advance 'end' to point to email end delimiter */
 359        for ( ; end < len && msg[end] != '>'; end++)
 360                ; /* do nothing */
 361
 362        if (end >= len)
 363                goto skip;
 364
 365        if (part == 'e') {      /* email */
 366                strbuf_add(sb, msg + start, end - start);
 367                return placeholder_len;
 368        }
 369
 370        /* advance 'start' to point to date start delimiter */
 371        for (start = end + 1; start < len && isspace(msg[start]); start++)
 372                ; /* do nothing */
 373        if (start >= len)
 374                goto skip;
 375        date = strtoul(msg + start, &ep, 10);
 376        if (msg + start == ep)
 377                goto skip;
 378
 379        if (part == 't') {      /* date, UNIX timestamp */
 380                strbuf_add(sb, msg + start, ep - (msg + start));
 381                return placeholder_len;
 382        }
 383
 384        /* parse tz */
 385        for (start = ep - msg + 1; start < len && isspace(msg[start]); start++)
 386                ; /* do nothing */
 387        if (start + 1 < len) {
 388                tz = strtoul(msg + start + 1, NULL, 10);
 389                if (msg[start] == '-')
 390                        tz = -tz;
 391        }
 392
 393        switch (part) {
 394        case 'd':       /* date */
 395                strbuf_addstr(sb, show_date(date, tz, dmode));
 396                return placeholder_len;
 397        case 'D':       /* date, RFC2822 style */
 398                strbuf_addstr(sb, show_date(date, tz, DATE_RFC2822));
 399                return placeholder_len;
 400        case 'r':       /* date, relative */
 401                strbuf_addstr(sb, show_date(date, tz, DATE_RELATIVE));
 402                return placeholder_len;
 403        case 'i':       /* date, ISO 8601 */
 404                strbuf_addstr(sb, show_date(date, tz, DATE_ISO8601));
 405                return placeholder_len;
 406        }
 407
 408skip:
 409        /*
 410         * bogus commit, 'sb' cannot be updated, but we still need to
 411         * compute a valid return value.
 412         */
 413        if (part == 'n' || part == 'e' || part == 't' || part == 'd'
 414            || part == 'D' || part == 'r' || part == 'i')
 415                return placeholder_len;
 416
 417        return 0; /* unknown placeholder */
 418}
 419
 420struct chunk {
 421        size_t off;
 422        size_t len;
 423};
 424
 425struct format_commit_context {
 426        const struct commit *commit;
 427        enum date_mode dmode;
 428        unsigned commit_header_parsed:1;
 429        unsigned commit_message_parsed:1;
 430
 431        /* These offsets are relative to the start of the commit message. */
 432        struct chunk author;
 433        struct chunk committer;
 434        struct chunk encoding;
 435        size_t message_off;
 436        size_t subject_off;
 437        size_t body_off;
 438
 439        /* The following ones are relative to the result struct strbuf. */
 440        struct chunk abbrev_commit_hash;
 441        struct chunk abbrev_tree_hash;
 442        struct chunk abbrev_parent_hashes;
 443};
 444
 445static int add_again(struct strbuf *sb, struct chunk *chunk)
 446{
 447        if (chunk->len) {
 448                strbuf_adddup(sb, chunk->off, chunk->len);
 449                return 1;
 450        }
 451
 452        /*
 453         * We haven't seen this chunk before.  Our caller is surely
 454         * going to add it the hard way now.  Remember the most likely
 455         * start of the to-be-added chunk: the current end of the
 456         * struct strbuf.
 457         */
 458        chunk->off = sb->len;
 459        return 0;
 460}
 461
 462static void parse_commit_header(struct format_commit_context *context)
 463{
 464        const char *msg = context->commit->buffer;
 465        int i;
 466
 467        for (i = 0; msg[i]; i++) {
 468                int eol;
 469                for (eol = i; msg[eol] && msg[eol] != '\n'; eol++)
 470                        ; /* do nothing */
 471
 472                if (i == eol) {
 473                        break;
 474                } else if (!prefixcmp(msg + i, "author ")) {
 475                        context->author.off = i + 7;
 476                        context->author.len = eol - i - 7;
 477                } else if (!prefixcmp(msg + i, "committer ")) {
 478                        context->committer.off = i + 10;
 479                        context->committer.len = eol - i - 10;
 480                } else if (!prefixcmp(msg + i, "encoding ")) {
 481                        context->encoding.off = i + 9;
 482                        context->encoding.len = eol - i - 9;
 483                }
 484                i = eol;
 485        }
 486        context->message_off = i;
 487        context->commit_header_parsed = 1;
 488}
 489
 490const char *format_subject(struct strbuf *sb, const char *msg,
 491                           const char *line_separator)
 492{
 493        int first = 1;
 494
 495        for (;;) {
 496                const char *line = msg;
 497                int linelen = get_one_line(line);
 498
 499                msg += linelen;
 500                if (!linelen || is_empty_line(line, &linelen))
 501                        break;
 502
 503                if (!sb)
 504                        continue;
 505                strbuf_grow(sb, linelen + 2);
 506                if (!first)
 507                        strbuf_addstr(sb, line_separator);
 508                strbuf_add(sb, line, linelen);
 509                first = 0;
 510        }
 511        return msg;
 512}
 513
 514static void parse_commit_message(struct format_commit_context *c)
 515{
 516        const char *msg = c->commit->buffer + c->message_off;
 517        const char *start = c->commit->buffer;
 518
 519        msg = skip_empty_lines(msg);
 520        c->subject_off = msg - start;
 521
 522        msg = format_subject(NULL, msg, NULL);
 523        msg = skip_empty_lines(msg);
 524        c->body_off = msg - start;
 525
 526        c->commit_message_parsed = 1;
 527}
 528
 529static void format_decoration(struct strbuf *sb, const struct commit *commit)
 530{
 531        struct name_decoration *d;
 532        const char *prefix = " (";
 533
 534        load_ref_decorations();
 535        d = lookup_decoration(&name_decoration, &commit->object);
 536        while (d) {
 537                strbuf_addstr(sb, prefix);
 538                prefix = ", ";
 539                strbuf_addstr(sb, d->name);
 540                d = d->next;
 541        }
 542        if (prefix[0] == ',')
 543                strbuf_addch(sb, ')');
 544}
 545
 546static size_t format_commit_item(struct strbuf *sb, const char *placeholder,
 547                               void *context)
 548{
 549        struct format_commit_context *c = context;
 550        const struct commit *commit = c->commit;
 551        const char *msg = commit->buffer;
 552        struct commit_list *p;
 553        int h1, h2;
 554
 555        /* these are independent of the commit */
 556        switch (placeholder[0]) {
 557        case 'C':
 558                if (placeholder[1] == '(') {
 559                        const char *end = strchr(placeholder + 2, ')');
 560                        char color[COLOR_MAXLEN];
 561                        if (!end)
 562                                return 0;
 563                        color_parse_mem(placeholder + 2,
 564                                        end - (placeholder + 2),
 565                                        "--pretty format", color);
 566                        strbuf_addstr(sb, color);
 567                        return end - placeholder + 1;
 568                }
 569                if (!prefixcmp(placeholder + 1, "red")) {
 570                        strbuf_addstr(sb, "\033[31m");
 571                        return 4;
 572                } else if (!prefixcmp(placeholder + 1, "green")) {
 573                        strbuf_addstr(sb, "\033[32m");
 574                        return 6;
 575                } else if (!prefixcmp(placeholder + 1, "blue")) {
 576                        strbuf_addstr(sb, "\033[34m");
 577                        return 5;
 578                } else if (!prefixcmp(placeholder + 1, "reset")) {
 579                        strbuf_addstr(sb, "\033[m");
 580                        return 6;
 581                } else
 582                        return 0;
 583        case 'n':               /* newline */
 584                strbuf_addch(sb, '\n');
 585                return 1;
 586        case 'x':
 587                /* %x00 == NUL, %x0a == LF, etc. */
 588                if (0 <= (h1 = hexval_table[0xff & placeholder[1]]) &&
 589                    h1 <= 16 &&
 590                    0 <= (h2 = hexval_table[0xff & placeholder[2]]) &&
 591                    h2 <= 16) {
 592                        strbuf_addch(sb, (h1<<4)|h2);
 593                        return 3;
 594                } else
 595                        return 0;
 596        }
 597
 598        /* these depend on the commit */
 599        if (!commit->object.parsed)
 600                parse_object(commit->object.sha1);
 601
 602        switch (placeholder[0]) {
 603        case 'H':               /* commit hash */
 604                strbuf_addstr(sb, sha1_to_hex(commit->object.sha1));
 605                return 1;
 606        case 'h':               /* abbreviated commit hash */
 607                if (add_again(sb, &c->abbrev_commit_hash))
 608                        return 1;
 609                strbuf_addstr(sb, find_unique_abbrev(commit->object.sha1,
 610                                                     DEFAULT_ABBREV));
 611                c->abbrev_commit_hash.len = sb->len - c->abbrev_commit_hash.off;
 612                return 1;
 613        case 'T':               /* tree hash */
 614                strbuf_addstr(sb, sha1_to_hex(commit->tree->object.sha1));
 615                return 1;
 616        case 't':               /* abbreviated tree hash */
 617                if (add_again(sb, &c->abbrev_tree_hash))
 618                        return 1;
 619                strbuf_addstr(sb, find_unique_abbrev(commit->tree->object.sha1,
 620                                                     DEFAULT_ABBREV));
 621                c->abbrev_tree_hash.len = sb->len - c->abbrev_tree_hash.off;
 622                return 1;
 623        case 'P':               /* parent hashes */
 624                for (p = commit->parents; p; p = p->next) {
 625                        if (p != commit->parents)
 626                                strbuf_addch(sb, ' ');
 627                        strbuf_addstr(sb, sha1_to_hex(p->item->object.sha1));
 628                }
 629                return 1;
 630        case 'p':               /* abbreviated parent hashes */
 631                if (add_again(sb, &c->abbrev_parent_hashes))
 632                        return 1;
 633                for (p = commit->parents; p; p = p->next) {
 634                        if (p != commit->parents)
 635                                strbuf_addch(sb, ' ');
 636                        strbuf_addstr(sb, find_unique_abbrev(
 637                                        p->item->object.sha1, DEFAULT_ABBREV));
 638                }
 639                c->abbrev_parent_hashes.len = sb->len -
 640                                              c->abbrev_parent_hashes.off;
 641                return 1;
 642        case 'm':               /* left/right/bottom */
 643                strbuf_addch(sb, (commit->object.flags & BOUNDARY)
 644                                 ? '-'
 645                                 : (commit->object.flags & SYMMETRIC_LEFT)
 646                                 ? '<'
 647                                 : '>');
 648                return 1;
 649        case 'd':
 650                format_decoration(sb, commit);
 651                return 1;
 652        }
 653
 654        /* For the rest we have to parse the commit header. */
 655        if (!c->commit_header_parsed)
 656                parse_commit_header(c);
 657
 658        switch (placeholder[0]) {
 659        case 'a':       /* author ... */
 660                return format_person_part(sb, placeholder[1],
 661                                   msg + c->author.off, c->author.len,
 662                                   c->dmode);
 663        case 'c':       /* committer ... */
 664                return format_person_part(sb, placeholder[1],
 665                                   msg + c->committer.off, c->committer.len,
 666                                   c->dmode);
 667        case 'e':       /* encoding */
 668                strbuf_add(sb, msg + c->encoding.off, c->encoding.len);
 669                return 1;
 670        }
 671
 672        /* Now we need to parse the commit message. */
 673        if (!c->commit_message_parsed)
 674                parse_commit_message(c);
 675
 676        switch (placeholder[0]) {
 677        case 's':       /* subject */
 678                format_subject(sb, msg + c->subject_off, " ");
 679                return 1;
 680        case 'b':       /* body */
 681                strbuf_addstr(sb, msg + c->body_off);
 682                return 1;
 683        }
 684        return 0;       /* unknown placeholder */
 685}
 686
 687void format_commit_message(const struct commit *commit,
 688                           const void *format, struct strbuf *sb,
 689                           enum date_mode dmode)
 690{
 691        struct format_commit_context context;
 692
 693        memset(&context, 0, sizeof(context));
 694        context.commit = commit;
 695        context.dmode = dmode;
 696        strbuf_expand(sb, format, format_commit_item, &context);
 697}
 698
 699static void pp_header(enum cmit_fmt fmt,
 700                      int abbrev,
 701                      enum date_mode dmode,
 702                      const char *encoding,
 703                      const struct commit *commit,
 704                      const char **msg_p,
 705                      struct strbuf *sb)
 706{
 707        int parents_shown = 0;
 708
 709        for (;;) {
 710                const char *line = *msg_p;
 711                int linelen = get_one_line(*msg_p);
 712
 713                if (!linelen)
 714                        return;
 715                *msg_p += linelen;
 716
 717                if (linelen == 1)
 718                        /* End of header */
 719                        return;
 720
 721                if (fmt == CMIT_FMT_RAW) {
 722                        strbuf_add(sb, line, linelen);
 723                        continue;
 724                }
 725
 726                if (!memcmp(line, "parent ", 7)) {
 727                        if (linelen != 48)
 728                                die("bad parent line in commit");
 729                        continue;
 730                }
 731
 732                if (!parents_shown) {
 733                        struct commit_list *parent;
 734                        int num;
 735                        for (parent = commit->parents, num = 0;
 736                             parent;
 737                             parent = parent->next, num++)
 738                                ;
 739                        /* with enough slop */
 740                        strbuf_grow(sb, num * 50 + 20);
 741                        add_merge_info(fmt, sb, commit, abbrev);
 742                        parents_shown = 1;
 743                }
 744
 745                /*
 746                 * MEDIUM == DEFAULT shows only author with dates.
 747                 * FULL shows both authors but not dates.
 748                 * FULLER shows both authors and dates.
 749                 */
 750                if (!memcmp(line, "author ", 7)) {
 751                        strbuf_grow(sb, linelen + 80);
 752                        pp_user_info("Author", fmt, sb, line + 7, dmode, encoding);
 753                }
 754                if (!memcmp(line, "committer ", 10) &&
 755                    (fmt == CMIT_FMT_FULL || fmt == CMIT_FMT_FULLER)) {
 756                        strbuf_grow(sb, linelen + 80);
 757                        pp_user_info("Commit", fmt, sb, line + 10, dmode, encoding);
 758                }
 759        }
 760}
 761
 762void pp_title_line(enum cmit_fmt fmt,
 763                   const char **msg_p,
 764                   struct strbuf *sb,
 765                   const char *subject,
 766                   const char *after_subject,
 767                   const char *encoding,
 768                   int need_8bit_cte)
 769{
 770        const char *line_separator = (fmt == CMIT_FMT_EMAIL) ? "\n " : " ";
 771        struct strbuf title;
 772
 773        strbuf_init(&title, 80);
 774        *msg_p = format_subject(&title, *msg_p, line_separator);
 775
 776        strbuf_grow(sb, title.len + 1024);
 777        if (subject) {
 778                strbuf_addstr(sb, subject);
 779                add_rfc2047(sb, title.buf, title.len, encoding);
 780        } else {
 781                strbuf_addbuf(sb, &title);
 782        }
 783        strbuf_addch(sb, '\n');
 784
 785        if (need_8bit_cte > 0) {
 786                const char *header_fmt =
 787                        "MIME-Version: 1.0\n"
 788                        "Content-Type: text/plain; charset=%s\n"
 789                        "Content-Transfer-Encoding: 8bit\n";
 790                strbuf_addf(sb, header_fmt, encoding);
 791        }
 792        if (after_subject) {
 793                strbuf_addstr(sb, after_subject);
 794        }
 795        if (fmt == CMIT_FMT_EMAIL) {
 796                strbuf_addch(sb, '\n');
 797        }
 798        strbuf_release(&title);
 799}
 800
 801void pp_remainder(enum cmit_fmt fmt,
 802                  const char **msg_p,
 803                  struct strbuf *sb,
 804                  int indent)
 805{
 806        int first = 1;
 807        for (;;) {
 808                const char *line = *msg_p;
 809                int linelen = get_one_line(line);
 810                *msg_p += linelen;
 811
 812                if (!linelen)
 813                        break;
 814
 815                if (is_empty_line(line, &linelen)) {
 816                        if (first)
 817                                continue;
 818                        if (fmt == CMIT_FMT_SHORT)
 819                                break;
 820                }
 821                first = 0;
 822
 823                strbuf_grow(sb, linelen + indent + 20);
 824                if (indent) {
 825                        memset(sb->buf + sb->len, ' ', indent);
 826                        strbuf_setlen(sb, sb->len + indent);
 827                }
 828                strbuf_add(sb, line, linelen);
 829                strbuf_addch(sb, '\n');
 830        }
 831}
 832
 833char *reencode_commit_message(const struct commit *commit, const char **encoding_p)
 834{
 835        const char *encoding;
 836
 837        encoding = (git_log_output_encoding
 838                    ? git_log_output_encoding
 839                    : git_commit_encoding);
 840        if (!encoding)
 841                encoding = "utf-8";
 842        if (encoding_p)
 843                *encoding_p = encoding;
 844        return logmsg_reencode(commit, encoding);
 845}
 846
 847void pretty_print_commit(enum cmit_fmt fmt, const struct commit *commit,
 848                         struct strbuf *sb, int abbrev,
 849                         const char *subject, const char *after_subject,
 850                         enum date_mode dmode, int need_8bit_cte)
 851{
 852        unsigned long beginning_of_body;
 853        int indent = 4;
 854        const char *msg = commit->buffer;
 855        char *reencoded;
 856        const char *encoding;
 857
 858        if (fmt == CMIT_FMT_USERFORMAT) {
 859                format_commit_message(commit, user_format, sb, dmode);
 860                return;
 861        }
 862
 863        reencoded = reencode_commit_message(commit, &encoding);
 864        if (reencoded) {
 865                msg = reencoded;
 866        }
 867
 868        if (fmt == CMIT_FMT_ONELINE || fmt == CMIT_FMT_EMAIL)
 869                indent = 0;
 870
 871        /*
 872         * We need to check and emit Content-type: to mark it
 873         * as 8-bit if we haven't done so.
 874         */
 875        if (fmt == CMIT_FMT_EMAIL && need_8bit_cte == 0) {
 876                int i, ch, in_body;
 877
 878                for (in_body = i = 0; (ch = msg[i]); i++) {
 879                        if (!in_body) {
 880                                /* author could be non 7-bit ASCII but
 881                                 * the log may be so; skip over the
 882                                 * header part first.
 883                                 */
 884                                if (ch == '\n' && msg[i+1] == '\n')
 885                                        in_body = 1;
 886                        }
 887                        else if (non_ascii(ch)) {
 888                                need_8bit_cte = 1;
 889                                break;
 890                        }
 891                }
 892        }
 893
 894        pp_header(fmt, abbrev, dmode, encoding, commit, &msg, sb);
 895        if (fmt != CMIT_FMT_ONELINE && !subject) {
 896                strbuf_addch(sb, '\n');
 897        }
 898
 899        /* Skip excess blank lines at the beginning of body, if any... */
 900        msg = skip_empty_lines(msg);
 901
 902        /* These formats treat the title line specially. */
 903        if (fmt == CMIT_FMT_ONELINE || fmt == CMIT_FMT_EMAIL)
 904                pp_title_line(fmt, &msg, sb, subject,
 905                              after_subject, encoding, need_8bit_cte);
 906
 907        beginning_of_body = sb->len;
 908        if (fmt != CMIT_FMT_ONELINE)
 909                pp_remainder(fmt, &msg, sb, indent);
 910        strbuf_rtrim(sb);
 911
 912        /* Make sure there is an EOLN for the non-oneline case */
 913        if (fmt != CMIT_FMT_ONELINE)
 914                strbuf_addch(sb, '\n');
 915
 916        /*
 917         * The caller may append additional body text in e-mail
 918         * format.  Make sure we did not strip the blank line
 919         * between the header and the body.
 920         */
 921        if (fmt == CMIT_FMT_EMAIL && sb->len <= beginning_of_body)
 922                strbuf_addch(sb, '\n');
 923        free(reencoded);
 924}