Merge branch 'ks/maint-mailinfo-folded'
[git/git.git] / builtin-mailinfo.c
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 #include "utf8.h"
8 #include "strbuf.h"
9
10 static FILE *cmitmsg, *patchfile, *fin, *fout;
11
12 static int keep_subject;
13 static const char *metainfo_charset;
14 static struct strbuf line = STRBUF_INIT;
15 static struct strbuf name = STRBUF_INIT;
16 static struct strbuf email = STRBUF_INIT;
17
18 static enum {
19 TE_DONTCARE, TE_QP, TE_BASE64,
20 } transfer_encoding;
21 static enum {
22 TYPE_TEXT, TYPE_OTHER,
23 } message_type;
24
25 static struct strbuf charset = STRBUF_INIT;
26 static int patch_lines;
27 static struct strbuf **p_hdr_data, **s_hdr_data;
28
29 #define MAX_HDR_PARSED 10
30 #define MAX_BOUNDARIES 5
31
32 static void get_sane_name(struct strbuf *out, struct strbuf *name, struct strbuf *email)
33 {
34 struct strbuf *src = name;
35 if (name->len < 3 || 60 < name->len || strchr(name->buf, '@') ||
36 strchr(name->buf, '<') || strchr(name->buf, '>'))
37 src = email;
38 else if (name == out)
39 return;
40 strbuf_reset(out);
41 strbuf_addbuf(out, src);
42 }
43
44 static void parse_bogus_from(const struct strbuf *line)
45 {
46 /* John Doe <johndoe> */
47
48 char *bra, *ket;
49 /* This is fallback, so do not bother if we already have an
50 * e-mail address.
51 */
52 if (email.len)
53 return;
54
55 bra = strchr(line->buf, '<');
56 if (!bra)
57 return;
58 ket = strchr(bra, '>');
59 if (!ket)
60 return;
61
62 strbuf_reset(&email);
63 strbuf_add(&email, bra + 1, ket - bra - 1);
64
65 strbuf_reset(&name);
66 strbuf_add(&name, line->buf, bra - line->buf);
67 strbuf_trim(&name);
68 get_sane_name(&name, &name, &email);
69 }
70
71 static void handle_from(const struct strbuf *from)
72 {
73 char *at;
74 size_t el;
75 struct strbuf f;
76
77 strbuf_init(&f, from->len);
78 strbuf_addbuf(&f, from);
79
80 at = strchr(f.buf, '@');
81 if (!at) {
82 parse_bogus_from(from);
83 return;
84 }
85
86 /*
87 * If we already have one email, don't take any confusing lines
88 */
89 if (email.len && strchr(at + 1, '@')) {
90 strbuf_release(&f);
91 return;
92 }
93
94 /* Pick up the string around '@', possibly delimited with <>
95 * pair; that is the email part.
96 */
97 while (at > f.buf) {
98 char c = at[-1];
99 if (isspace(c))
100 break;
101 if (c == '<') {
102 at[-1] = ' ';
103 break;
104 }
105 at--;
106 }
107 el = strcspn(at, " \n\t\r\v\f>");
108 strbuf_reset(&email);
109 strbuf_add(&email, at, el);
110 strbuf_remove(&f, at - f.buf, el + (at[el] ? 1 : 0));
111
112 /* The remainder is name. It could be "John Doe <john.doe@xz>"
113 * or "john.doe@xz (John Doe)", but we have removed the
114 * email part, so trim from both ends, possibly removing
115 * the () pair at the end.
116 */
117 strbuf_trim(&f);
118 if (f.buf[0] == '(' && f.len && f.buf[f.len - 1] == ')') {
119 strbuf_remove(&f, 0, 1);
120 strbuf_setlen(&f, f.len - 1);
121 }
122
123 get_sane_name(&name, &f, &email);
124 strbuf_release(&f);
125 }
126
127 static void handle_header(struct strbuf **out, const struct strbuf *line)
128 {
129 if (!*out) {
130 *out = xmalloc(sizeof(struct strbuf));
131 strbuf_init(*out, line->len);
132 } else
133 strbuf_reset(*out);
134
135 strbuf_addbuf(*out, line);
136 }
137
138 /* NOTE NOTE NOTE. We do not claim we do full MIME. We just attempt
139 * to have enough heuristics to grok MIME encoded patches often found
140 * on our mailing lists. For example, we do not even treat header lines
141 * case insensitively.
142 */
143
144 static int slurp_attr(const char *line, const char *name, struct strbuf *attr)
145 {
146 const char *ends, *ap = strcasestr(line, name);
147 size_t sz;
148
149 if (!ap) {
150 strbuf_setlen(attr, 0);
151 return 0;
152 }
153 ap += strlen(name);
154 if (*ap == '"') {
155 ap++;
156 ends = "\"";
157 }
158 else
159 ends = "; \t";
160 sz = strcspn(ap, ends);
161 strbuf_add(attr, ap, sz);
162 return 1;
163 }
164
165 static struct strbuf *content[MAX_BOUNDARIES];
166
167 static struct strbuf **content_top = content;
168
169 static void handle_content_type(struct strbuf *line)
170 {
171 struct strbuf *boundary = xmalloc(sizeof(struct strbuf));
172 strbuf_init(boundary, line->len);
173
174 if (!strcasestr(line->buf, "text/"))
175 message_type = TYPE_OTHER;
176 if (slurp_attr(line->buf, "boundary=", boundary)) {
177 strbuf_insert(boundary, 0, "--", 2);
178 if (++content_top > &content[MAX_BOUNDARIES]) {
179 fprintf(stderr, "Too many boundaries to handle\n");
180 exit(1);
181 }
182 *content_top = boundary;
183 boundary = NULL;
184 }
185 if (slurp_attr(line->buf, "charset=", &charset))
186 strbuf_tolower(&charset);
187
188 if (boundary) {
189 strbuf_release(boundary);
190 free(boundary);
191 }
192 }
193
194 static void handle_content_transfer_encoding(const struct strbuf *line)
195 {
196 if (strcasestr(line->buf, "base64"))
197 transfer_encoding = TE_BASE64;
198 else if (strcasestr(line->buf, "quoted-printable"))
199 transfer_encoding = TE_QP;
200 else
201 transfer_encoding = TE_DONTCARE;
202 }
203
204 static int is_multipart_boundary(const struct strbuf *line)
205 {
206 return (((*content_top)->len <= line->len) &&
207 !memcmp(line->buf, (*content_top)->buf, (*content_top)->len));
208 }
209
210 static void cleanup_subject(struct strbuf *subject)
211 {
212 char *pos;
213 size_t remove;
214 while (subject->len) {
215 switch (*subject->buf) {
216 case 'r': case 'R':
217 if (subject->len <= 3)
218 break;
219 if (!memcmp(subject->buf + 1, "e:", 2)) {
220 strbuf_remove(subject, 0, 3);
221 continue;
222 }
223 break;
224 case ' ': case '\t': case ':':
225 strbuf_remove(subject, 0, 1);
226 continue;
227 case '[':
228 if ((pos = strchr(subject->buf, ']'))) {
229 remove = pos - subject->buf;
230 if (remove <= (subject->len - remove) * 2) {
231 strbuf_remove(subject, 0, remove + 1);
232 continue;
233 }
234 } else
235 strbuf_remove(subject, 0, 1);
236 break;
237 }
238 strbuf_trim(subject);
239 return;
240 }
241 }
242
243 static void cleanup_space(struct strbuf *sb)
244 {
245 size_t pos, cnt;
246 for (pos = 0; pos < sb->len; pos++) {
247 if (isspace(sb->buf[pos])) {
248 sb->buf[pos] = ' ';
249 for (cnt = 0; isspace(sb->buf[pos + cnt + 1]); cnt++);
250 strbuf_remove(sb, pos + 1, cnt);
251 }
252 }
253 }
254
255 static void decode_header(struct strbuf *line);
256 static const char *header[MAX_HDR_PARSED] = {
257 "From","Subject","Date",
258 };
259
260 static inline int cmp_header(const struct strbuf *line, const char *hdr)
261 {
262 int len = strlen(hdr);
263 return !strncasecmp(line->buf, hdr, len) && line->len > len &&
264 line->buf[len] == ':' && isspace(line->buf[len + 1]);
265 }
266
267 static int check_header(const struct strbuf *line,
268 struct strbuf *hdr_data[], int overwrite)
269 {
270 int i, ret = 0, len;
271 struct strbuf sb = STRBUF_INIT;
272 /* search for the interesting parts */
273 for (i = 0; header[i]; i++) {
274 int len = strlen(header[i]);
275 if ((!hdr_data[i] || overwrite) && cmp_header(line, header[i])) {
276 /* Unwrap inline B and Q encoding, and optionally
277 * normalize the meta information to utf8.
278 */
279 strbuf_add(&sb, line->buf + len + 2, line->len - len - 2);
280 decode_header(&sb);
281 handle_header(&hdr_data[i], &sb);
282 ret = 1;
283 goto check_header_out;
284 }
285 }
286
287 /* Content stuff */
288 if (cmp_header(line, "Content-Type")) {
289 len = strlen("Content-Type: ");
290 strbuf_add(&sb, line->buf + len, line->len - len);
291 decode_header(&sb);
292 strbuf_insert(&sb, 0, "Content-Type: ", len);
293 handle_content_type(&sb);
294 ret = 1;
295 goto check_header_out;
296 }
297 if (cmp_header(line, "Content-Transfer-Encoding")) {
298 len = strlen("Content-Transfer-Encoding: ");
299 strbuf_add(&sb, line->buf + len, line->len - len);
300 decode_header(&sb);
301 handle_content_transfer_encoding(&sb);
302 ret = 1;
303 goto check_header_out;
304 }
305
306 /* for inbody stuff */
307 if (!prefixcmp(line->buf, ">From") && isspace(line->buf[5])) {
308 ret = 1; /* Should this return 0? */
309 goto check_header_out;
310 }
311 if (!prefixcmp(line->buf, "[PATCH]") && isspace(line->buf[7])) {
312 for (i = 0; header[i]; i++) {
313 if (!memcmp("Subject", header[i], 7)) {
314 handle_header(&hdr_data[i], line);
315 ret = 1;
316 goto check_header_out;
317 }
318 }
319 }
320
321 check_header_out:
322 strbuf_release(&sb);
323 return ret;
324 }
325
326 static int is_rfc2822_header(const struct strbuf *line)
327 {
328 /*
329 * The section that defines the loosest possible
330 * field name is "3.6.8 Optional fields".
331 *
332 * optional-field = field-name ":" unstructured CRLF
333 * field-name = 1*ftext
334 * ftext = %d33-57 / %59-126
335 */
336 int ch;
337 char *cp = line->buf;
338
339 /* Count mbox From headers as headers */
340 if (!prefixcmp(cp, "From ") || !prefixcmp(cp, ">From "))
341 return 1;
342
343 while ((ch = *cp++)) {
344 if (ch == ':')
345 return 1;
346 if ((33 <= ch && ch <= 57) ||
347 (59 <= ch && ch <= 126))
348 continue;
349 break;
350 }
351 return 0;
352 }
353
354 static int read_one_header_line(struct strbuf *line, FILE *in)
355 {
356 /* Get the first part of the line. */
357 if (strbuf_getline(line, in, '\n'))
358 return 0;
359
360 /*
361 * Is it an empty line or not a valid rfc2822 header?
362 * If so, stop here, and return false ("not a header")
363 */
364 strbuf_rtrim(line);
365 if (!line->len || !is_rfc2822_header(line)) {
366 /* Re-add the newline */
367 strbuf_addch(line, '\n');
368 return 0;
369 }
370
371 /*
372 * Now we need to eat all the continuation lines..
373 * Yuck, 2822 header "folding"
374 */
375 for (;;) {
376 int peek;
377 struct strbuf continuation = STRBUF_INIT;
378
379 peek = fgetc(in); ungetc(peek, in);
380 if (peek != ' ' && peek != '\t')
381 break;
382 if (strbuf_getline(&continuation, in, '\n'))
383 break;
384 continuation.buf[0] = '\n';
385 strbuf_rtrim(&continuation);
386 strbuf_addbuf(line, &continuation);
387 }
388
389 return 1;
390 }
391
392 static struct strbuf *decode_q_segment(const struct strbuf *q_seg, int rfc2047)
393 {
394 const char *in = q_seg->buf;
395 int c;
396 struct strbuf *out = xmalloc(sizeof(struct strbuf));
397 strbuf_init(out, q_seg->len);
398
399 while ((c = *in++) != 0) {
400 if (c == '=') {
401 int d = *in++;
402 if (d == '\n' || !d)
403 break; /* drop trailing newline */
404 strbuf_addch(out, (hexval(d) << 4) | hexval(*in++));
405 continue;
406 }
407 if (rfc2047 && c == '_') /* rfc2047 4.2 (2) */
408 c = 0x20;
409 strbuf_addch(out, c);
410 }
411 return out;
412 }
413
414 static struct strbuf *decode_b_segment(const struct strbuf *b_seg)
415 {
416 /* Decode in..ep, possibly in-place to ot */
417 int c, pos = 0, acc = 0;
418 const char *in = b_seg->buf;
419 struct strbuf *out = xmalloc(sizeof(struct strbuf));
420 strbuf_init(out, b_seg->len);
421
422 while ((c = *in++) != 0) {
423 if (c == '+')
424 c = 62;
425 else if (c == '/')
426 c = 63;
427 else if ('A' <= c && c <= 'Z')
428 c -= 'A';
429 else if ('a' <= c && c <= 'z')
430 c -= 'a' - 26;
431 else if ('0' <= c && c <= '9')
432 c -= '0' - 52;
433 else
434 continue; /* garbage */
435 switch (pos++) {
436 case 0:
437 acc = (c << 2);
438 break;
439 case 1:
440 strbuf_addch(out, (acc | (c >> 4)));
441 acc = (c & 15) << 4;
442 break;
443 case 2:
444 strbuf_addch(out, (acc | (c >> 2)));
445 acc = (c & 3) << 6;
446 break;
447 case 3:
448 strbuf_addch(out, (acc | c));
449 acc = pos = 0;
450 break;
451 }
452 }
453 return out;
454 }
455
456 /*
457 * When there is no known charset, guess.
458 *
459 * Right now we assume that if the target is UTF-8 (the default),
460 * and it already looks like UTF-8 (which includes US-ASCII as its
461 * subset, of course) then that is what it is and there is nothing
462 * to do.
463 *
464 * Otherwise, we default to assuming it is Latin1 for historical
465 * reasons.
466 */
467 static const char *guess_charset(const struct strbuf *line, const char *target_charset)
468 {
469 if (is_encoding_utf8(target_charset)) {
470 if (is_utf8(line->buf))
471 return NULL;
472 }
473 return "latin1";
474 }
475
476 static void convert_to_utf8(struct strbuf *line, const char *charset)
477 {
478 char *out;
479
480 if (!charset || !*charset) {
481 charset = guess_charset(line, metainfo_charset);
482 if (!charset)
483 return;
484 }
485
486 if (!strcmp(metainfo_charset, charset))
487 return;
488 out = reencode_string(line->buf, metainfo_charset, charset);
489 if (!out)
490 die("cannot convert from %s to %s",
491 charset, metainfo_charset);
492 strbuf_attach(line, out, strlen(out), strlen(out));
493 }
494
495 static int decode_header_bq(struct strbuf *it)
496 {
497 char *in, *ep, *cp;
498 struct strbuf outbuf = STRBUF_INIT, *dec;
499 struct strbuf charset_q = STRBUF_INIT, piecebuf = STRBUF_INIT;
500 int rfc2047 = 0;
501
502 in = it->buf;
503 while (in - it->buf <= it->len && (ep = strstr(in, "=?")) != NULL) {
504 int encoding;
505 strbuf_reset(&charset_q);
506 strbuf_reset(&piecebuf);
507 rfc2047 = 1;
508
509 if (in != ep) {
510 /*
511 * We are about to process an encoded-word
512 * that begins at ep, but there is something
513 * before the encoded word.
514 */
515 char *scan;
516 for (scan = in; scan < ep; scan++)
517 if (!isspace(*scan))
518 break;
519
520 if (scan != ep || in == it->buf) {
521 /*
522 * We should not lose that "something",
523 * unless we have just processed an
524 * encoded-word, and there is only LWS
525 * before the one we are about to process.
526 */
527 strbuf_add(&outbuf, in, ep - in);
528 }
529 in = ep;
530 }
531 /* E.g.
532 * ep : "=?iso-2022-jp?B?GyR...?= foo"
533 * ep : "=?ISO-8859-1?Q?Foo=FCbar?= baz"
534 */
535 ep += 2;
536
537 if (ep - it->buf >= it->len || !(cp = strchr(ep, '?')))
538 goto decode_header_bq_out;
539
540 if (cp + 3 - it->buf > it->len)
541 goto decode_header_bq_out;
542 strbuf_add(&charset_q, ep, cp - ep);
543 strbuf_tolower(&charset_q);
544
545 encoding = cp[1];
546 if (!encoding || cp[2] != '?')
547 goto decode_header_bq_out;
548 ep = strstr(cp + 3, "?=");
549 if (!ep)
550 goto decode_header_bq_out;
551 strbuf_add(&piecebuf, cp + 3, ep - cp - 3);
552 switch (tolower(encoding)) {
553 default:
554 goto decode_header_bq_out;
555 case 'b':
556 dec = decode_b_segment(&piecebuf);
557 break;
558 case 'q':
559 dec = decode_q_segment(&piecebuf, 1);
560 break;
561 }
562 if (metainfo_charset)
563 convert_to_utf8(dec, charset_q.buf);
564
565 strbuf_addbuf(&outbuf, dec);
566 strbuf_release(dec);
567 free(dec);
568 in = ep + 2;
569 }
570 strbuf_addstr(&outbuf, in);
571 strbuf_reset(it);
572 strbuf_addbuf(it, &outbuf);
573 decode_header_bq_out:
574 strbuf_release(&outbuf);
575 strbuf_release(&charset_q);
576 strbuf_release(&piecebuf);
577 return rfc2047;
578 }
579
580 static void decode_header(struct strbuf *it)
581 {
582 if (decode_header_bq(it))
583 return;
584 /* otherwise "it" is a straight copy of the input.
585 * This can be binary guck but there is no charset specified.
586 */
587 if (metainfo_charset)
588 convert_to_utf8(it, "");
589 }
590
591 static void decode_transfer_encoding(struct strbuf *line)
592 {
593 struct strbuf *ret;
594
595 switch (transfer_encoding) {
596 case TE_QP:
597 ret = decode_q_segment(line, 0);
598 break;
599 case TE_BASE64:
600 ret = decode_b_segment(line);
601 break;
602 case TE_DONTCARE:
603 default:
604 return;
605 }
606 strbuf_reset(line);
607 strbuf_addbuf(line, ret);
608 strbuf_release(ret);
609 free(ret);
610 }
611
612 static void handle_filter(struct strbuf *line);
613
614 static int find_boundary(void)
615 {
616 while (!strbuf_getline(&line, fin, '\n')) {
617 if (*content_top && is_multipart_boundary(&line))
618 return 1;
619 }
620 return 0;
621 }
622
623 static int handle_boundary(void)
624 {
625 struct strbuf newline = STRBUF_INIT;
626
627 strbuf_addch(&newline, '\n');
628 again:
629 if (line.len >= (*content_top)->len + 2 &&
630 !memcmp(line.buf + (*content_top)->len, "--", 2)) {
631 /* we hit an end boundary */
632 /* pop the current boundary off the stack */
633 strbuf_release(*content_top);
634 free(*content_top);
635 *content_top = NULL;
636
637 /* technically won't happen as is_multipart_boundary()
638 will fail first. But just in case..
639 */
640 if (--content_top < content) {
641 fprintf(stderr, "Detected mismatched boundaries, "
642 "can't recover\n");
643 exit(1);
644 }
645 handle_filter(&newline);
646 strbuf_release(&newline);
647
648 /* skip to the next boundary */
649 if (!find_boundary())
650 return 0;
651 goto again;
652 }
653
654 /* set some defaults */
655 transfer_encoding = TE_DONTCARE;
656 strbuf_reset(&charset);
657 message_type = TYPE_TEXT;
658
659 /* slurp in this section's info */
660 while (read_one_header_line(&line, fin))
661 check_header(&line, p_hdr_data, 0);
662
663 strbuf_release(&newline);
664 /* replenish line */
665 if (strbuf_getline(&line, fin, '\n'))
666 return 0;
667 strbuf_addch(&line, '\n');
668 return 1;
669 }
670
671 static inline int patchbreak(const struct strbuf *line)
672 {
673 size_t i;
674
675 /* Beginning of a "diff -" header? */
676 if (!prefixcmp(line->buf, "diff -"))
677 return 1;
678
679 /* CVS "Index: " line? */
680 if (!prefixcmp(line->buf, "Index: "))
681 return 1;
682
683 /*
684 * "--- <filename>" starts patches without headers
685 * "---<sp>*" is a manual separator
686 */
687 if (line->len < 4)
688 return 0;
689
690 if (!prefixcmp(line->buf, "---")) {
691 /* space followed by a filename? */
692 if (line->buf[3] == ' ' && !isspace(line->buf[4]))
693 return 1;
694 /* Just whitespace? */
695 for (i = 3; i < line->len; i++) {
696 unsigned char c = line->buf[i];
697 if (c == '\n')
698 return 1;
699 if (!isspace(c))
700 break;
701 }
702 return 0;
703 }
704 return 0;
705 }
706
707 static int handle_commit_msg(struct strbuf *line)
708 {
709 static int still_looking = 1;
710
711 if (!cmitmsg)
712 return 0;
713
714 if (still_looking) {
715 strbuf_ltrim(line);
716 if (!line->len)
717 return 0;
718 if ((still_looking = check_header(line, s_hdr_data, 0)) != 0)
719 return 0;
720 }
721
722 /* normalize the log message to UTF-8. */
723 if (metainfo_charset)
724 convert_to_utf8(line, charset.buf);
725
726 if (patchbreak(line)) {
727 fclose(cmitmsg);
728 cmitmsg = NULL;
729 return 1;
730 }
731
732 fputs(line->buf, cmitmsg);
733 return 0;
734 }
735
736 static void handle_patch(const struct strbuf *line)
737 {
738 fwrite(line->buf, 1, line->len, patchfile);
739 patch_lines++;
740 }
741
742 static void handle_filter(struct strbuf *line)
743 {
744 static int filter = 0;
745
746 /* filter tells us which part we left off on */
747 switch (filter) {
748 case 0:
749 if (!handle_commit_msg(line))
750 break;
751 filter++;
752 case 1:
753 handle_patch(line);
754 break;
755 }
756 }
757
758 static void handle_body(void)
759 {
760 int len = 0;
761 struct strbuf prev = STRBUF_INIT;
762
763 /* Skip up to the first boundary */
764 if (*content_top) {
765 if (!find_boundary())
766 goto handle_body_out;
767 }
768
769 do {
770 strbuf_setlen(&line, line.len + len);
771
772 /* process any boundary lines */
773 if (*content_top && is_multipart_boundary(&line)) {
774 /* flush any leftover */
775 if (prev.len) {
776 handle_filter(&prev);
777 strbuf_reset(&prev);
778 }
779 if (!handle_boundary())
780 goto handle_body_out;
781 }
782
783 /* Unwrap transfer encoding */
784 decode_transfer_encoding(&line);
785
786 switch (transfer_encoding) {
787 case TE_BASE64:
788 case TE_QP:
789 {
790 struct strbuf **lines, **it, *sb;
791
792 /* Prepend any previous partial lines */
793 strbuf_insert(&line, 0, prev.buf, prev.len);
794 strbuf_reset(&prev);
795
796 /* binary data most likely doesn't have newlines */
797 if (message_type != TYPE_TEXT) {
798 handle_filter(&line);
799 break;
800 }
801 /*
802 * This is a decoded line that may contain
803 * multiple new lines. Pass only one chunk
804 * at a time to handle_filter()
805 */
806 lines = strbuf_split(&line, '\n');
807 for (it = lines; (sb = *it); it++) {
808 if (*(it + 1) == NULL) /* The last line */
809 if (sb->buf[sb->len - 1] != '\n') {
810 /* Partial line, save it for later. */
811 strbuf_addbuf(&prev, sb);
812 break;
813 }
814 handle_filter(sb);
815 }
816 /*
817 * The partial chunk is saved in "prev" and will be
818 * appended by the next iteration of read_line_with_nul().
819 */
820 strbuf_list_free(lines);
821 break;
822 }
823 default:
824 handle_filter(&line);
825 }
826
827 strbuf_reset(&line);
828 if (strbuf_avail(&line) < 100)
829 strbuf_grow(&line, 100);
830 } while ((len = read_line_with_nul(line.buf, strbuf_avail(&line), fin)));
831
832 handle_body_out:
833 strbuf_release(&prev);
834 }
835
836 static void output_header_lines(FILE *fout, const char *hdr, const struct strbuf *data)
837 {
838 const char *sp = data->buf;
839 while (1) {
840 char *ep = strchr(sp, '\n');
841 int len;
842 if (!ep)
843 len = strlen(sp);
844 else
845 len = ep - sp;
846 fprintf(fout, "%s: %.*s\n", hdr, len, sp);
847 if (!ep)
848 break;
849 sp = ep + 1;
850 }
851 }
852
853 static void handle_info(void)
854 {
855 struct strbuf *hdr;
856 int i;
857
858 for (i = 0; header[i]; i++) {
859 /* only print inbody headers if we output a patch file */
860 if (patch_lines && s_hdr_data[i])
861 hdr = s_hdr_data[i];
862 else if (p_hdr_data[i])
863 hdr = p_hdr_data[i];
864 else
865 continue;
866
867 if (!memcmp(header[i], "Subject", 7)) {
868 if (!keep_subject) {
869 cleanup_subject(hdr);
870 cleanup_space(hdr);
871 }
872 output_header_lines(fout, "Subject", hdr);
873 } else if (!memcmp(header[i], "From", 4)) {
874 cleanup_space(hdr);
875 handle_from(hdr);
876 fprintf(fout, "Author: %s\n", name.buf);
877 fprintf(fout, "Email: %s\n", email.buf);
878 } else {
879 cleanup_space(hdr);
880 fprintf(fout, "%s: %s\n", header[i], hdr->buf);
881 }
882 }
883 fprintf(fout, "\n");
884 }
885
886 static int mailinfo(FILE *in, FILE *out, int ks, const char *encoding,
887 const char *msg, const char *patch)
888 {
889 int peek;
890 keep_subject = ks;
891 metainfo_charset = encoding;
892 fin = in;
893 fout = out;
894
895 cmitmsg = fopen(msg, "w");
896 if (!cmitmsg) {
897 perror(msg);
898 return -1;
899 }
900 patchfile = fopen(patch, "w");
901 if (!patchfile) {
902 perror(patch);
903 fclose(cmitmsg);
904 return -1;
905 }
906
907 p_hdr_data = xcalloc(MAX_HDR_PARSED, sizeof(*p_hdr_data));
908 s_hdr_data = xcalloc(MAX_HDR_PARSED, sizeof(*s_hdr_data));
909
910 do {
911 peek = fgetc(in);
912 } while (isspace(peek));
913 ungetc(peek, in);
914
915 /* process the email header */
916 while (read_one_header_line(&line, fin))
917 check_header(&line, p_hdr_data, 1);
918
919 handle_body();
920 handle_info();
921
922 return 0;
923 }
924
925 static const char mailinfo_usage[] =
926 "git mailinfo [-k] [-u | --encoding=<encoding> | -n] msg patch <mail >info";
927
928 int cmd_mailinfo(int argc, const char **argv, const char *prefix)
929 {
930 const char *def_charset;
931
932 /* NEEDSWORK: might want to do the optional .git/ directory
933 * discovery
934 */
935 git_config(git_default_config, NULL);
936
937 def_charset = (git_commit_encoding ? git_commit_encoding : "utf-8");
938 metainfo_charset = def_charset;
939
940 while (1 < argc && argv[1][0] == '-') {
941 if (!strcmp(argv[1], "-k"))
942 keep_subject = 1;
943 else if (!strcmp(argv[1], "-u"))
944 metainfo_charset = def_charset;
945 else if (!strcmp(argv[1], "-n"))
946 metainfo_charset = NULL;
947 else if (!prefixcmp(argv[1], "--encoding="))
948 metainfo_charset = argv[1] + 11;
949 else
950 usage(mailinfo_usage);
951 argc--; argv++;
952 }
953
954 if (argc != 3)
955 usage(mailinfo_usage);
956
957 return !!mailinfo(stdin, stdout, keep_subject, metainfo_charset, argv[1], argv[2]);
958 }