builtin-mailinfo.con commit GIT v1.5.0 preview (d5e86da)
   1/*
   2 * Another stupid program, this one parsing the headers of an
   3 * email to figure out authorship and subject
   4 */
   5#include "cache.h"
   6#include "builtin.h"
   7
   8static FILE *cmitmsg, *patchfile, *fin, *fout;
   9
  10static int keep_subject;
  11static const char *metainfo_charset;
  12static char line[1000];
  13static char date[1000];
  14static char name[1000];
  15static char email[1000];
  16static char subject[1000];
  17
  18static enum  {
  19        TE_DONTCARE, TE_QP, TE_BASE64,
  20} transfer_encoding;
  21static char charset[256];
  22
  23static char multipart_boundary[1000];
  24static int multipart_boundary_len;
  25static int patch_lines;
  26
  27static char *sanity_check(char *name, char *email)
  28{
  29        int len = strlen(name);
  30        if (len < 3 || len > 60)
  31                return email;
  32        if (strchr(name, '@') || strchr(name, '<') || strchr(name, '>'))
  33                return email;
  34        return name;
  35}
  36
  37static int bogus_from(char *line)
  38{
  39        /* John Doe <johndoe> */
  40        char *bra, *ket, *dst, *cp;
  41
  42        /* This is fallback, so do not bother if we already have an
  43         * e-mail address.
  44         */
  45        if (*email)
  46                return 0;
  47
  48        bra = strchr(line, '<');
  49        if (!bra)
  50                return 0;
  51        ket = strchr(bra, '>');
  52        if (!ket)
  53                return 0;
  54
  55        for (dst = email, cp = bra+1; cp < ket; )
  56                *dst++ = *cp++;
  57        *dst = 0;
  58        for (cp = line; isspace(*cp); cp++)
  59                ;
  60        for (bra--; isspace(*bra); bra--)
  61                *bra = 0;
  62        cp = sanity_check(cp, email);
  63        strcpy(name, cp);
  64        return 1;
  65}
  66
  67static int handle_from(char *in_line)
  68{
  69        char line[1000];
  70        char *at;
  71        char *dst;
  72
  73        strcpy(line, in_line);
  74        at = strchr(line, '@');
  75        if (!at)
  76                return bogus_from(line);
  77
  78        /*
  79         * If we already have one email, don't take any confusing lines
  80         */
  81        if (*email && strchr(at+1, '@'))
  82                return 0;
  83
  84        /* Pick up the string around '@', possibly delimited with <>
  85         * pair; that is the email part.  White them out while copying.
  86         */
  87        while (at > line) {
  88                char c = at[-1];
  89                if (isspace(c))
  90                        break;
  91                if (c == '<') {
  92                        at[-1] = ' ';
  93                        break;
  94                }
  95                at--;
  96        }
  97        dst = email;
  98        for (;;) {
  99                unsigned char c = *at;
 100                if (!c || c == '>' || isspace(c)) {
 101                        if (c == '>')
 102                                *at = ' ';
 103                        break;
 104                }
 105                *at++ = ' ';
 106                *dst++ = c;
 107        }
 108        *dst++ = 0;
 109
 110        /* The remainder is name.  It could be "John Doe <john.doe@xz>"
 111         * or "john.doe@xz (John Doe)", but we have whited out the
 112         * email part, so trim from both ends, possibly removing
 113         * the () pair at the end.
 114         */
 115        at = line + strlen(line);
 116        while (at > line) {
 117                unsigned char c = *--at;
 118                if (!isspace(c)) {
 119                        at[(c == ')') ? 0 : 1] = 0;
 120                        break;
 121                }
 122        }
 123
 124        at = line;
 125        for (;;) {
 126                unsigned char c = *at;
 127                if (!c || !isspace(c)) {
 128                        if (c == '(')
 129                                at++;
 130                        break;
 131                }
 132                at++;
 133        }
 134        at = sanity_check(at, email);
 135        strcpy(name, at);
 136        return 1;
 137}
 138
 139static int handle_date(char *line)
 140{
 141        strcpy(date, line);
 142        return 0;
 143}
 144
 145static int handle_subject(char *line)
 146{
 147        strcpy(subject, line);
 148        return 0;
 149}
 150
 151/* NOTE NOTE NOTE.  We do not claim we do full MIME.  We just attempt
 152 * to have enough heuristics to grok MIME encoded patches often found
 153 * on our mailing lists.  For example, we do not even treat header lines
 154 * case insensitively.
 155 */
 156
 157static int slurp_attr(const char *line, const char *name, char *attr)
 158{
 159        const char *ends, *ap = strcasestr(line, name);
 160        size_t sz;
 161
 162        if (!ap) {
 163                *attr = 0;
 164                return 0;
 165        }
 166        ap += strlen(name);
 167        if (*ap == '"') {
 168                ap++;
 169                ends = "\"";
 170        }
 171        else
 172                ends = "; \t";
 173        sz = strcspn(ap, ends);
 174        memcpy(attr, ap, sz);
 175        attr[sz] = 0;
 176        return 1;
 177}
 178
 179static int handle_subcontent_type(char *line)
 180{
 181        /* We do not want to mess with boundary.  Note that we do not
 182         * handle nested multipart.
 183         */
 184        if (strcasestr(line, "boundary=")) {
 185                fprintf(stderr, "Not handling nested multipart message.\n");
 186                exit(1);
 187        }
 188        slurp_attr(line, "charset=", charset);
 189        if (*charset) {
 190                int i, c;
 191                for (i = 0; (c = charset[i]) != 0; i++)
 192                        charset[i] = tolower(c);
 193        }
 194        return 0;
 195}
 196
 197static int handle_content_type(char *line)
 198{
 199        *multipart_boundary = 0;
 200        if (slurp_attr(line, "boundary=", multipart_boundary + 2)) {
 201                memcpy(multipart_boundary, "--", 2);
 202                multipart_boundary_len = strlen(multipart_boundary);
 203        }
 204        slurp_attr(line, "charset=", charset);
 205        return 0;
 206}
 207
 208static int handle_content_transfer_encoding(char *line)
 209{
 210        if (strcasestr(line, "base64"))
 211                transfer_encoding = TE_BASE64;
 212        else if (strcasestr(line, "quoted-printable"))
 213                transfer_encoding = TE_QP;
 214        else
 215                transfer_encoding = TE_DONTCARE;
 216        return 0;
 217}
 218
 219static int is_multipart_boundary(const char *line)
 220{
 221        return (!memcmp(line, multipart_boundary, multipart_boundary_len));
 222}
 223
 224static int eatspace(char *line)
 225{
 226        int len = strlen(line);
 227        while (len > 0 && isspace(line[len-1]))
 228                line[--len] = 0;
 229        return len;
 230}
 231
 232#define SEEN_FROM 01
 233#define SEEN_DATE 02
 234#define SEEN_SUBJECT 04
 235#define SEEN_BOGUS_UNIX_FROM 010
 236#define SEEN_PREFIX  020
 237
 238/* First lines of body can have From:, Date:, and Subject: or empty */
 239static void handle_inbody_header(int *seen, char *line)
 240{
 241        if (*seen & SEEN_PREFIX)
 242                return;
 243        if (isspace(*line)) {
 244                char *cp;
 245                for (cp = line + 1; *cp; cp++) {
 246                        if (!isspace(*cp))
 247                                break;
 248                }
 249                if (!*cp)
 250                        return;
 251        }
 252        if (!memcmp(">From", line, 5) && isspace(line[5])) {
 253                if (!(*seen & SEEN_BOGUS_UNIX_FROM)) {
 254                        *seen |= SEEN_BOGUS_UNIX_FROM;
 255                        return;
 256                }
 257        }
 258        if (!memcmp("From:", line, 5) && isspace(line[5])) {
 259                if (!(*seen & SEEN_FROM) && handle_from(line+6)) {
 260                        *seen |= SEEN_FROM;
 261                        return;
 262                }
 263        }
 264        if (!memcmp("Date:", line, 5) && isspace(line[5])) {
 265                if (!(*seen & SEEN_DATE)) {
 266                        handle_date(line+6);
 267                        *seen |= SEEN_DATE;
 268                        return;
 269                }
 270        }
 271        if (!memcmp("Subject:", line, 8) && isspace(line[8])) {
 272                if (!(*seen & SEEN_SUBJECT)) {
 273                        handle_subject(line+9);
 274                        *seen |= SEEN_SUBJECT;
 275                        return;
 276                }
 277        }
 278        if (!memcmp("[PATCH]", line, 7) && isspace(line[7])) {
 279                if (!(*seen & SEEN_SUBJECT)) {
 280                        handle_subject(line);
 281                        *seen |= SEEN_SUBJECT;
 282                        return;
 283                }
 284        }
 285        *seen |= SEEN_PREFIX;
 286}
 287
 288static char *cleanup_subject(char *subject)
 289{
 290        if (keep_subject)
 291                return subject;
 292        for (;;) {
 293                char *p;
 294                int len, remove;
 295                switch (*subject) {
 296                case 'r': case 'R':
 297                        if (!memcmp("e:", subject+1, 2)) {
 298                                subject +=3;
 299                                continue;
 300                        }
 301                        break;
 302                case ' ': case '\t': case ':':
 303                        subject++;
 304                        continue;
 305
 306                case '[':
 307                        p = strchr(subject, ']');
 308                        if (!p) {
 309                                subject++;
 310                                continue;
 311                        }
 312                        len = strlen(p);
 313                        remove = p - subject;
 314                        if (remove <= len *2) {
 315                                subject = p+1;
 316                                continue;
 317                        }
 318                        break;
 319                }
 320                eatspace(subject);
 321                return subject;
 322        }
 323}
 324
 325static void cleanup_space(char *buf)
 326{
 327        unsigned char c;
 328        while ((c = *buf) != 0) {
 329                buf++;
 330                if (isspace(c)) {
 331                        buf[-1] = ' ';
 332                        c = *buf;
 333                        while (isspace(c)) {
 334                                int len = strlen(buf);
 335                                memmove(buf, buf+1, len);
 336                                c = *buf;
 337                        }
 338                }
 339        }
 340}
 341
 342static void decode_header(char *it);
 343typedef int (*header_fn_t)(char *);
 344struct header_def {
 345        const char *name;
 346        header_fn_t func;
 347        int namelen;
 348};
 349
 350static void check_header(char *line, struct header_def *header)
 351{
 352        int i;
 353
 354        if (header[0].namelen <= 0) {
 355                for (i = 0; header[i].name; i++)
 356                        header[i].namelen = strlen(header[i].name);
 357        }
 358        for (i = 0; header[i].name; i++) {
 359                int len = header[i].namelen;
 360                if (!strncasecmp(line, header[i].name, len) &&
 361                    line[len] == ':' && isspace(line[len + 1])) {
 362                        /* Unwrap inline B and Q encoding, and optionally
 363                         * normalize the meta information to utf8.
 364                         */
 365                        decode_header(line + len + 2);
 366                        header[i].func(line + len + 2);
 367                        break;
 368                }
 369        }
 370}
 371
 372static void check_subheader_line(char *line)
 373{
 374        static struct header_def header[] = {
 375                { "Content-Type", handle_subcontent_type },
 376                { "Content-Transfer-Encoding",
 377                  handle_content_transfer_encoding },
 378                { NULL },
 379        };
 380        check_header(line, header);
 381}
 382static void check_header_line(char *line)
 383{
 384        static struct header_def header[] = {
 385                { "From", handle_from },
 386                { "Date", handle_date },
 387                { "Subject", handle_subject },
 388                { "Content-Type", handle_content_type },
 389                { "Content-Transfer-Encoding",
 390                  handle_content_transfer_encoding },
 391                { NULL },
 392        };
 393        check_header(line, header);
 394}
 395
 396static int is_rfc2822_header(char *line)
 397{
 398        /*
 399         * The section that defines the loosest possible
 400         * field name is "3.6.8 Optional fields".
 401         *
 402         * optional-field = field-name ":" unstructured CRLF
 403         * field-name = 1*ftext
 404         * ftext = %d33-57 / %59-126
 405         */
 406        int ch;
 407        char *cp = line;
 408        while ((ch = *cp++)) {
 409                if (ch == ':')
 410                        return cp != line;
 411                if ((33 <= ch && ch <= 57) ||
 412                    (59 <= ch && ch <= 126))
 413                        continue;
 414                break;
 415        }
 416        return 0;
 417}
 418
 419static int read_one_header_line(char *line, int sz, FILE *in)
 420{
 421        int ofs = 0;
 422        while (ofs < sz) {
 423                int peek, len;
 424                if (fgets(line + ofs, sz - ofs, in) == NULL)
 425                        break;
 426                len = eatspace(line + ofs);
 427                if ((len == 0) || !is_rfc2822_header(line)) {
 428                        /* Re-add the newline */
 429                        line[ofs + len] = '\n';
 430                        line[ofs + len + 1] = '\0';
 431                        break;
 432                }
 433                ofs += len;
 434                /* Yuck, 2822 header "folding" */
 435                peek = fgetc(in); ungetc(peek, in);
 436                if (peek != ' ' && peek != '\t')
 437                        break;
 438        }
 439        /* Count mbox From headers as headers */
 440        if (!ofs && (!memcmp(line, "From ", 5) || !memcmp(line, ">From ", 6)))
 441                ofs = 1;
 442        return ofs;
 443}
 444
 445static int decode_q_segment(char *in, char *ot, char *ep, int rfc2047)
 446{
 447        int c;
 448        while ((c = *in++) != 0 && (in <= ep)) {
 449                if (c == '=') {
 450                        int d = *in++;
 451                        if (d == '\n' || !d)
 452                                break; /* drop trailing newline */
 453                        *ot++ = ((hexval(d) << 4) | hexval(*in++));
 454                        continue;
 455                }
 456                if (rfc2047 && c == '_') /* rfc2047 4.2 (2) */
 457                        c = 0x20;
 458                *ot++ = c;
 459        }
 460        *ot = 0;
 461        return 0;
 462}
 463
 464static int decode_b_segment(char *in, char *ot, char *ep)
 465{
 466        /* Decode in..ep, possibly in-place to ot */
 467        int c, pos = 0, acc = 0;
 468
 469        while ((c = *in++) != 0 && (in <= ep)) {
 470                if (c == '+')
 471                        c = 62;
 472                else if (c == '/')
 473                        c = 63;
 474                else if ('A' <= c && c <= 'Z')
 475                        c -= 'A';
 476                else if ('a' <= c && c <= 'z')
 477                        c -= 'a' - 26;
 478                else if ('0' <= c && c <= '9')
 479                        c -= '0' - 52;
 480                else if (c == '=') {
 481                        /* padding is almost like (c == 0), except we do
 482                         * not output NUL resulting only from it;
 483                         * for now we just trust the data.
 484                         */
 485                        c = 0;
 486                }
 487                else
 488                        continue; /* garbage */
 489                switch (pos++) {
 490                case 0:
 491                        acc = (c << 2);
 492                        break;
 493                case 1:
 494                        *ot++ = (acc | (c >> 4));
 495                        acc = (c & 15) << 4;
 496                        break;
 497                case 2:
 498                        *ot++ = (acc | (c >> 2));
 499                        acc = (c & 3) << 6;
 500                        break;
 501                case 3:
 502                        *ot++ = (acc | c);
 503                        acc = pos = 0;
 504                        break;
 505                }
 506        }
 507        *ot = 0;
 508        return 0;
 509}
 510
 511static void convert_to_utf8(char *line, char *charset)
 512{
 513#ifndef NO_ICONV
 514        char *in, *out;
 515        size_t insize, outsize, nrc;
 516        char outbuf[4096]; /* cheat */
 517        static char latin_one[] = "latin1";
 518        char *input_charset = *charset ? charset : latin_one;
 519        iconv_t conv = iconv_open(metainfo_charset, input_charset);
 520
 521        if (conv == (iconv_t) -1) {
 522                static int warned_latin1_once = 0;
 523                if (input_charset != latin_one) {
 524                        fprintf(stderr, "cannot convert from %s to %s\n",
 525                                input_charset, metainfo_charset);
 526                        *charset = 0;
 527                }
 528                else if (!warned_latin1_once) {
 529                        warned_latin1_once = 1;
 530                        fprintf(stderr, "tried to convert from %s to %s, "
 531                                "but your iconv does not work with it.\n",
 532                                input_charset, metainfo_charset);
 533                }
 534                return;
 535        }
 536        in = line;
 537        insize = strlen(in);
 538        out = outbuf;
 539        outsize = sizeof(outbuf);
 540        nrc = iconv(conv, &in, &insize, &out, &outsize);
 541        iconv_close(conv);
 542        if (nrc == (size_t) -1)
 543                return;
 544        *out = 0;
 545        strcpy(line, outbuf);
 546#endif
 547}
 548
 549static int decode_header_bq(char *it)
 550{
 551        char *in, *out, *ep, *cp, *sp;
 552        char outbuf[1000];
 553        int rfc2047 = 0;
 554
 555        in = it;
 556        out = outbuf;
 557        while ((ep = strstr(in, "=?")) != NULL) {
 558                int sz, encoding;
 559                char charset_q[256], piecebuf[256];
 560                rfc2047 = 1;
 561
 562                if (in != ep) {
 563                        sz = ep - in;
 564                        memcpy(out, in, sz);
 565                        out += sz;
 566                        in += sz;
 567                }
 568                /* E.g.
 569                 * ep : "=?iso-2022-jp?B?GyR...?= foo"
 570                 * ep : "=?ISO-8859-1?Q?Foo=FCbar?= baz"
 571                 */
 572                ep += 2;
 573                cp = strchr(ep, '?');
 574                if (!cp)
 575                        return rfc2047; /* no munging */
 576                for (sp = ep; sp < cp; sp++)
 577                        charset_q[sp - ep] = tolower(*sp);
 578                charset_q[cp - ep] = 0;
 579                encoding = cp[1];
 580                if (!encoding || cp[2] != '?')
 581                        return rfc2047; /* no munging */
 582                ep = strstr(cp + 3, "?=");
 583                if (!ep)
 584                        return rfc2047; /* no munging */
 585                switch (tolower(encoding)) {
 586                default:
 587                        return rfc2047; /* no munging */
 588                case 'b':
 589                        sz = decode_b_segment(cp + 3, piecebuf, ep);
 590                        break;
 591                case 'q':
 592                        sz = decode_q_segment(cp + 3, piecebuf, ep, 1);
 593                        break;
 594                }
 595                if (sz < 0)
 596                        return rfc2047;
 597                if (metainfo_charset)
 598                        convert_to_utf8(piecebuf, charset_q);
 599                strcpy(out, piecebuf);
 600                out += strlen(out);
 601                in = ep + 2;
 602        }
 603        strcpy(out, in);
 604        strcpy(it, outbuf);
 605        return rfc2047;
 606}
 607
 608static void decode_header(char *it)
 609{
 610
 611        if (decode_header_bq(it))
 612                return;
 613        /* otherwise "it" is a straight copy of the input.
 614         * This can be binary guck but there is no charset specified.
 615         */
 616        if (metainfo_charset)
 617                convert_to_utf8(it, "");
 618}
 619
 620static void decode_transfer_encoding(char *line)
 621{
 622        char *ep;
 623
 624        switch (transfer_encoding) {
 625        case TE_QP:
 626                ep = line + strlen(line);
 627                decode_q_segment(line, line, ep, 0);
 628                break;
 629        case TE_BASE64:
 630                ep = line + strlen(line);
 631                decode_b_segment(line, line, ep);
 632                break;
 633        case TE_DONTCARE:
 634                break;
 635        }
 636}
 637
 638static void handle_info(void)
 639{
 640        char *sub;
 641
 642        sub = cleanup_subject(subject);
 643        cleanup_space(name);
 644        cleanup_space(date);
 645        cleanup_space(email);
 646        cleanup_space(sub);
 647
 648        fprintf(fout, "Author: %s\nEmail: %s\nSubject: %s\nDate: %s\n\n",
 649               name, email, sub, date);
 650}
 651
 652/* We are inside message body and have read line[] already.
 653 * Spit out the commit log.
 654 */
 655static int handle_commit_msg(int *seen)
 656{
 657        if (!cmitmsg)
 658                return 0;
 659        do {
 660                if (!memcmp("diff -", line, 6) ||
 661                    !memcmp("---", line, 3) ||
 662                    !memcmp("Index: ", line, 7))
 663                        break;
 664                if ((multipart_boundary[0] && is_multipart_boundary(line))) {
 665                        /* We come here when the first part had only
 666                         * the commit message without any patch.  We
 667                         * pretend we have not seen this line yet, and
 668                         * go back to the loop.
 669                         */
 670                        return 1;
 671                }
 672
 673                /* Unwrap transfer encoding and optionally
 674                 * normalize the log message to UTF-8.
 675                 */
 676                decode_transfer_encoding(line);
 677                if (metainfo_charset)
 678                        convert_to_utf8(line, charset);
 679
 680                handle_inbody_header(seen, line);
 681                if (!(*seen & SEEN_PREFIX))
 682                        continue;
 683
 684                fputs(line, cmitmsg);
 685        } while (fgets(line, sizeof(line), fin) != NULL);
 686        fclose(cmitmsg);
 687        cmitmsg = NULL;
 688        return 0;
 689}
 690
 691/* We have done the commit message and have the first
 692 * line of the patch in line[].
 693 */
 694static void handle_patch(void)
 695{
 696        do {
 697                if (multipart_boundary[0] && is_multipart_boundary(line))
 698                        break;
 699                /* Only unwrap transfer encoding but otherwise do not
 700                 * do anything.  We do *NOT* want UTF-8 conversion
 701                 * here; we are dealing with the user payload.
 702                 */
 703                decode_transfer_encoding(line);
 704                fputs(line, patchfile);
 705                patch_lines++;
 706        } while (fgets(line, sizeof(line), fin) != NULL);
 707}
 708
 709/* multipart boundary and transfer encoding are set up for us, and we
 710 * are at the end of the sub header.  do equivalent of handle_body up
 711 * to the next boundary without closing patchfile --- we will expect
 712 * that the first part to contain commit message and a patch, and
 713 * handle other parts as pure patches.
 714 */
 715static int handle_multipart_one_part(int *seen)
 716{
 717        int n = 0;
 718
 719        while (fgets(line, sizeof(line), fin) != NULL) {
 720        again:
 721                n++;
 722                if (is_multipart_boundary(line))
 723                        break;
 724                if (handle_commit_msg(seen))
 725                        goto again;
 726                handle_patch();
 727                break;
 728        }
 729        if (n == 0)
 730                return -1;
 731        return 0;
 732}
 733
 734static void handle_multipart_body(void)
 735{
 736        int seen = 0;
 737        int part_num = 0;
 738
 739        /* Skip up to the first boundary */
 740        while (fgets(line, sizeof(line), fin) != NULL)
 741                if (is_multipart_boundary(line)) {
 742                        part_num = 1;
 743                        break;
 744                }
 745        if (!part_num)
 746                return;
 747        /* We are on boundary line.  Start slurping the subhead. */
 748        while (1) {
 749                int hdr = read_one_header_line(line, sizeof(line), fin);
 750                if (!hdr) {
 751                        if (handle_multipart_one_part(&seen) < 0)
 752                                return;
 753                        /* Reset per part headers */
 754                        transfer_encoding = TE_DONTCARE;
 755                        charset[0] = 0;
 756                }
 757                else
 758                        check_subheader_line(line);
 759        }
 760        fclose(patchfile);
 761        if (!patch_lines) {
 762                fprintf(stderr, "No patch found\n");
 763                exit(1);
 764        }
 765}
 766
 767/* Non multipart message */
 768static void handle_body(void)
 769{
 770        int seen = 0;
 771
 772        handle_commit_msg(&seen);
 773        handle_patch();
 774        fclose(patchfile);
 775        if (!patch_lines) {
 776                fprintf(stderr, "No patch found\n");
 777                exit(1);
 778        }
 779}
 780
 781int mailinfo(FILE *in, FILE *out, int ks, const char *encoding,
 782             const char *msg, const char *patch)
 783{
 784        keep_subject = ks;
 785        metainfo_charset = encoding;
 786        fin = in;
 787        fout = out;
 788
 789        cmitmsg = fopen(msg, "w");
 790        if (!cmitmsg) {
 791                perror(msg);
 792                return -1;
 793        }
 794        patchfile = fopen(patch, "w");
 795        if (!patchfile) {
 796                perror(patch);
 797                fclose(cmitmsg);
 798                return -1;
 799        }
 800        while (1) {
 801                int hdr = read_one_header_line(line, sizeof(line), fin);
 802                if (!hdr) {
 803                        if (multipart_boundary[0])
 804                                handle_multipart_body();
 805                        else
 806                                handle_body();
 807                        handle_info();
 808                        break;
 809                }
 810                check_header_line(line);
 811        }
 812
 813        return 0;
 814}
 815
 816static const char mailinfo_usage[] =
 817        "git-mailinfo [-k] [-u | --encoding=<encoding>] msg patch <mail >info";
 818
 819int cmd_mailinfo(int argc, const char **argv, const char *prefix)
 820{
 821        /* NEEDSWORK: might want to do the optional .git/ directory
 822         * discovery
 823         */
 824        git_config(git_default_config);
 825
 826        while (1 < argc && argv[1][0] == '-') {
 827                if (!strcmp(argv[1], "-k"))
 828                        keep_subject = 1;
 829                else if (!strcmp(argv[1], "-u"))
 830                        metainfo_charset = git_commit_encoding;
 831                else if (!strncmp(argv[1], "--encoding=", 11))
 832                        metainfo_charset = argv[1] + 11;
 833                else
 834                        usage(mailinfo_usage);
 835                argc--; argv++;
 836        }
 837
 838        if (argc != 3)
 839                usage(mailinfo_usage);
 840
 841        return !!mailinfo(stdin, stdout, keep_subject, metainfo_charset, argv[1], argv[2]);
 842}