submodule: Use cat instead of echo to avoid DOS line-endings
[git/dscho.git] / builtin / mailinfo.c
blobbfb32b7233850a68bdc226038a9c0f973037499b
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"
10 static FILE *cmitmsg, *patchfile, *fin, *fout;
12 static int keep_subject;
13 static int keep_non_patch_brackets_in_subject;
14 static const char *metainfo_charset;
15 static struct strbuf line = STRBUF_INIT;
16 static struct strbuf name = STRBUF_INIT;
17 static struct strbuf email = STRBUF_INIT;
19 static enum {
20 TE_DONTCARE, TE_QP, TE_BASE64
21 } transfer_encoding;
22 static enum {
23 TYPE_TEXT, TYPE_OTHER
24 } message_type;
26 static struct strbuf charset = STRBUF_INIT;
27 static int patch_lines;
28 static struct strbuf **p_hdr_data, **s_hdr_data;
29 static int use_scissors;
30 static int use_inbody_headers = 1;
32 #define MAX_HDR_PARSED 10
33 #define MAX_BOUNDARIES 5
35 static void cleanup_space(struct strbuf *sb);
38 static void get_sane_name(struct strbuf *out, struct strbuf *name, struct strbuf *email)
40 struct strbuf *src = name;
41 if (name->len < 3 || 60 < name->len || strchr(name->buf, '@') ||
42 strchr(name->buf, '<') || strchr(name->buf, '>'))
43 src = email;
44 else if (name == out)
45 return;
46 strbuf_reset(out);
47 strbuf_addbuf(out, src);
50 static void parse_bogus_from(const struct strbuf *line)
52 /* John Doe <johndoe> */
54 char *bra, *ket;
55 /* This is fallback, so do not bother if we already have an
56 * e-mail address.
58 if (email.len)
59 return;
61 bra = strchr(line->buf, '<');
62 if (!bra)
63 return;
64 ket = strchr(bra, '>');
65 if (!ket)
66 return;
68 strbuf_reset(&email);
69 strbuf_add(&email, bra + 1, ket - bra - 1);
71 strbuf_reset(&name);
72 strbuf_add(&name, line->buf, bra - line->buf);
73 strbuf_trim(&name);
74 get_sane_name(&name, &name, &email);
77 static void handle_from(const struct strbuf *from)
79 char *at;
80 size_t el;
81 struct strbuf f;
83 strbuf_init(&f, from->len);
84 strbuf_addbuf(&f, from);
86 at = strchr(f.buf, '@');
87 if (!at) {
88 parse_bogus_from(from);
89 return;
93 * If we already have one email, don't take any confusing lines
95 if (email.len && strchr(at + 1, '@')) {
96 strbuf_release(&f);
97 return;
100 /* Pick up the string around '@', possibly delimited with <>
101 * pair; that is the email part.
103 while (at > f.buf) {
104 char c = at[-1];
105 if (isspace(c))
106 break;
107 if (c == '<') {
108 at[-1] = ' ';
109 break;
111 at--;
113 el = strcspn(at, " \n\t\r\v\f>");
114 strbuf_reset(&email);
115 strbuf_add(&email, at, el);
116 strbuf_remove(&f, at - f.buf, el + (at[el] ? 1 : 0));
118 /* The remainder is name. It could be
120 * - "John Doe <john.doe@xz>" (a), or
121 * - "john.doe@xz (John Doe)" (b), or
122 * - "John (zzz) Doe <john.doe@xz> (Comment)" (c)
124 * but we have removed the email part, so
126 * - remove extra spaces which could stay after email (case 'c'), and
127 * - trim from both ends, possibly removing the () pair at the end
128 * (cases 'a' and 'b').
130 cleanup_space(&f);
131 strbuf_trim(&f);
132 if (f.buf[0] == '(' && f.len && f.buf[f.len - 1] == ')') {
133 strbuf_remove(&f, 0, 1);
134 strbuf_setlen(&f, f.len - 1);
137 get_sane_name(&name, &f, &email);
138 strbuf_release(&f);
141 static void handle_header(struct strbuf **out, const struct strbuf *line)
143 if (!*out) {
144 *out = xmalloc(sizeof(struct strbuf));
145 strbuf_init(*out, line->len);
146 } else
147 strbuf_reset(*out);
149 strbuf_addbuf(*out, line);
152 /* NOTE NOTE NOTE. We do not claim we do full MIME. We just attempt
153 * to have enough heuristics to grok MIME encoded patches often found
154 * on our mailing lists. For example, we do not even treat header lines
155 * case insensitively.
158 static int slurp_attr(const char *line, const char *name, struct strbuf *attr)
160 const char *ends, *ap = strcasestr(line, name);
161 size_t sz;
163 if (!ap) {
164 strbuf_setlen(attr, 0);
165 return 0;
167 ap += strlen(name);
168 if (*ap == '"') {
169 ap++;
170 ends = "\"";
172 else
173 ends = "; \t";
174 sz = strcspn(ap, ends);
175 strbuf_add(attr, ap, sz);
176 return 1;
179 static struct strbuf *content[MAX_BOUNDARIES];
181 static struct strbuf **content_top = content;
183 static void handle_content_type(struct strbuf *line)
185 struct strbuf *boundary = xmalloc(sizeof(struct strbuf));
186 strbuf_init(boundary, line->len);
188 if (!strcasestr(line->buf, "text/"))
189 message_type = TYPE_OTHER;
190 if (slurp_attr(line->buf, "boundary=", boundary)) {
191 strbuf_insert(boundary, 0, "--", 2);
192 if (++content_top > &content[MAX_BOUNDARIES]) {
193 fprintf(stderr, "Too many boundaries to handle\n");
194 exit(1);
196 *content_top = boundary;
197 boundary = NULL;
199 slurp_attr(line->buf, "charset=", &charset);
201 if (boundary) {
202 strbuf_release(boundary);
203 free(boundary);
207 static void handle_content_transfer_encoding(const struct strbuf *line)
209 if (strcasestr(line->buf, "base64"))
210 transfer_encoding = TE_BASE64;
211 else if (strcasestr(line->buf, "quoted-printable"))
212 transfer_encoding = TE_QP;
213 else
214 transfer_encoding = TE_DONTCARE;
217 static int is_multipart_boundary(const struct strbuf *line)
219 return (((*content_top)->len <= line->len) &&
220 !memcmp(line->buf, (*content_top)->buf, (*content_top)->len));
223 static void cleanup_subject(struct strbuf *subject)
225 size_t at = 0;
227 while (at < subject->len) {
228 char *pos;
229 size_t remove;
231 switch (subject->buf[at]) {
232 case 'r': case 'R':
233 if (subject->len <= at + 3)
234 break;
235 if (!memcmp(subject->buf + at + 1, "e:", 2)) {
236 strbuf_remove(subject, at, 3);
237 continue;
239 at++;
240 break;
241 case ' ': case '\t': case ':':
242 strbuf_remove(subject, at, 1);
243 continue;
244 case '[':
245 pos = strchr(subject->buf + at, ']');
246 if (!pos)
247 break;
248 remove = pos - subject->buf + at + 1;
249 if (!keep_non_patch_brackets_in_subject ||
250 (7 <= remove &&
251 memmem(subject->buf + at, remove, "PATCH", 5)))
252 strbuf_remove(subject, at, remove);
253 else
254 at += remove;
255 continue;
257 break;
259 strbuf_trim(subject);
262 static void cleanup_space(struct strbuf *sb)
264 size_t pos, cnt;
265 for (pos = 0; pos < sb->len; pos++) {
266 if (isspace(sb->buf[pos])) {
267 sb->buf[pos] = ' ';
268 for (cnt = 0; isspace(sb->buf[pos + cnt + 1]); cnt++);
269 strbuf_remove(sb, pos + 1, cnt);
274 static void decode_header(struct strbuf *line);
275 static const char *header[MAX_HDR_PARSED] = {
276 "From","Subject","Date",
279 static inline int cmp_header(const struct strbuf *line, const char *hdr)
281 int len = strlen(hdr);
282 return !strncasecmp(line->buf, hdr, len) && line->len > len &&
283 line->buf[len] == ':' && isspace(line->buf[len + 1]);
286 static int check_header(const struct strbuf *line,
287 struct strbuf *hdr_data[], int overwrite)
289 int i, ret = 0, len;
290 struct strbuf sb = STRBUF_INIT;
291 /* search for the interesting parts */
292 for (i = 0; header[i]; i++) {
293 int len = strlen(header[i]);
294 if ((!hdr_data[i] || overwrite) && cmp_header(line, header[i])) {
295 /* Unwrap inline B and Q encoding, and optionally
296 * normalize the meta information to utf8.
298 strbuf_add(&sb, line->buf + len + 2, line->len - len - 2);
299 decode_header(&sb);
300 handle_header(&hdr_data[i], &sb);
301 ret = 1;
302 goto check_header_out;
306 /* Content stuff */
307 if (cmp_header(line, "Content-Type")) {
308 len = strlen("Content-Type: ");
309 strbuf_add(&sb, line->buf + len, line->len - len);
310 decode_header(&sb);
311 strbuf_insert(&sb, 0, "Content-Type: ", len);
312 handle_content_type(&sb);
313 ret = 1;
314 goto check_header_out;
316 if (cmp_header(line, "Content-Transfer-Encoding")) {
317 len = strlen("Content-Transfer-Encoding: ");
318 strbuf_add(&sb, line->buf + len, line->len - len);
319 decode_header(&sb);
320 handle_content_transfer_encoding(&sb);
321 ret = 1;
322 goto check_header_out;
325 /* for inbody stuff */
326 if (!prefixcmp(line->buf, ">From") && isspace(line->buf[5])) {
327 ret = 1; /* Should this return 0? */
328 goto check_header_out;
330 if (!prefixcmp(line->buf, "[PATCH]") && isspace(line->buf[7])) {
331 for (i = 0; header[i]; i++) {
332 if (!memcmp("Subject", header[i], 7)) {
333 handle_header(&hdr_data[i], line);
334 ret = 1;
335 goto check_header_out;
340 check_header_out:
341 strbuf_release(&sb);
342 return ret;
345 static int is_rfc2822_header(const struct strbuf *line)
348 * The section that defines the loosest possible
349 * field name is "3.6.8 Optional fields".
351 * optional-field = field-name ":" unstructured CRLF
352 * field-name = 1*ftext
353 * ftext = %d33-57 / %59-126
355 int ch;
356 char *cp = line->buf;
358 /* Count mbox From headers as headers */
359 if (!prefixcmp(cp, "From ") || !prefixcmp(cp, ">From "))
360 return 1;
362 while ((ch = *cp++)) {
363 if (ch == ':')
364 return 1;
365 if ((33 <= ch && ch <= 57) ||
366 (59 <= ch && ch <= 126))
367 continue;
368 break;
370 return 0;
373 static int read_one_header_line(struct strbuf *line, FILE *in)
375 /* Get the first part of the line. */
376 if (strbuf_getline(line, in, '\n'))
377 return 0;
380 * Is it an empty line or not a valid rfc2822 header?
381 * If so, stop here, and return false ("not a header")
383 strbuf_rtrim(line);
384 if (!line->len || !is_rfc2822_header(line)) {
385 /* Re-add the newline */
386 strbuf_addch(line, '\n');
387 return 0;
391 * Now we need to eat all the continuation lines..
392 * Yuck, 2822 header "folding"
394 for (;;) {
395 int peek;
396 struct strbuf continuation = STRBUF_INIT;
398 peek = fgetc(in); ungetc(peek, in);
399 if (peek != ' ' && peek != '\t')
400 break;
401 if (strbuf_getline(&continuation, in, '\n'))
402 break;
403 continuation.buf[0] = ' ';
404 strbuf_rtrim(&continuation);
405 strbuf_addbuf(line, &continuation);
408 return 1;
411 static struct strbuf *decode_q_segment(const struct strbuf *q_seg, int rfc2047)
413 const char *in = q_seg->buf;
414 int c;
415 struct strbuf *out = xmalloc(sizeof(struct strbuf));
416 strbuf_init(out, q_seg->len);
418 while ((c = *in++) != 0) {
419 if (c == '=') {
420 int d = *in++;
421 if (d == '\n' || !d)
422 break; /* drop trailing newline */
423 strbuf_addch(out, (hexval(d) << 4) | hexval(*in++));
424 continue;
426 if (rfc2047 && c == '_') /* rfc2047 4.2 (2) */
427 c = 0x20;
428 strbuf_addch(out, c);
430 return out;
433 static struct strbuf *decode_b_segment(const struct strbuf *b_seg)
435 /* Decode in..ep, possibly in-place to ot */
436 int c, pos = 0, acc = 0;
437 const char *in = b_seg->buf;
438 struct strbuf *out = xmalloc(sizeof(struct strbuf));
439 strbuf_init(out, b_seg->len);
441 while ((c = *in++) != 0) {
442 if (c == '+')
443 c = 62;
444 else if (c == '/')
445 c = 63;
446 else if ('A' <= c && c <= 'Z')
447 c -= 'A';
448 else if ('a' <= c && c <= 'z')
449 c -= 'a' - 26;
450 else if ('0' <= c && c <= '9')
451 c -= '0' - 52;
452 else
453 continue; /* garbage */
454 switch (pos++) {
455 case 0:
456 acc = (c << 2);
457 break;
458 case 1:
459 strbuf_addch(out, (acc | (c >> 4)));
460 acc = (c & 15) << 4;
461 break;
462 case 2:
463 strbuf_addch(out, (acc | (c >> 2)));
464 acc = (c & 3) << 6;
465 break;
466 case 3:
467 strbuf_addch(out, (acc | c));
468 acc = pos = 0;
469 break;
472 return out;
476 * When there is no known charset, guess.
478 * Right now we assume that if the target is UTF-8 (the default),
479 * and it already looks like UTF-8 (which includes US-ASCII as its
480 * subset, of course) then that is what it is and there is nothing
481 * to do.
483 * Otherwise, we default to assuming it is Latin1 for historical
484 * reasons.
486 static const char *guess_charset(const struct strbuf *line, const char *target_charset)
488 if (is_encoding_utf8(target_charset)) {
489 if (is_utf8(line->buf))
490 return NULL;
492 return "ISO8859-1";
495 static void convert_to_utf8(struct strbuf *line, const char *charset)
497 char *out;
499 if (!charset || !*charset) {
500 charset = guess_charset(line, metainfo_charset);
501 if (!charset)
502 return;
505 if (!strcasecmp(metainfo_charset, charset))
506 return;
507 out = reencode_string(line->buf, metainfo_charset, charset);
508 if (!out)
509 die("cannot convert from %s to %s",
510 charset, metainfo_charset);
511 strbuf_attach(line, out, strlen(out), strlen(out));
514 static int decode_header_bq(struct strbuf *it)
516 char *in, *ep, *cp;
517 struct strbuf outbuf = STRBUF_INIT, *dec;
518 struct strbuf charset_q = STRBUF_INIT, piecebuf = STRBUF_INIT;
519 int rfc2047 = 0;
521 in = it->buf;
522 while (in - it->buf <= it->len && (ep = strstr(in, "=?")) != NULL) {
523 int encoding;
524 strbuf_reset(&charset_q);
525 strbuf_reset(&piecebuf);
526 rfc2047 = 1;
528 if (in != ep) {
530 * We are about to process an encoded-word
531 * that begins at ep, but there is something
532 * before the encoded word.
534 char *scan;
535 for (scan = in; scan < ep; scan++)
536 if (!isspace(*scan))
537 break;
539 if (scan != ep || in == it->buf) {
541 * We should not lose that "something",
542 * unless we have just processed an
543 * encoded-word, and there is only LWS
544 * before the one we are about to process.
546 strbuf_add(&outbuf, in, ep - in);
549 /* E.g.
550 * ep : "=?iso-2022-jp?B?GyR...?= foo"
551 * ep : "=?ISO-8859-1?Q?Foo=FCbar?= baz"
553 ep += 2;
555 if (ep - it->buf >= it->len || !(cp = strchr(ep, '?')))
556 goto decode_header_bq_out;
558 if (cp + 3 - it->buf > it->len)
559 goto decode_header_bq_out;
560 strbuf_add(&charset_q, ep, cp - ep);
562 encoding = cp[1];
563 if (!encoding || cp[2] != '?')
564 goto decode_header_bq_out;
565 ep = strstr(cp + 3, "?=");
566 if (!ep)
567 goto decode_header_bq_out;
568 strbuf_add(&piecebuf, cp + 3, ep - cp - 3);
569 switch (tolower(encoding)) {
570 default:
571 goto decode_header_bq_out;
572 case 'b':
573 dec = decode_b_segment(&piecebuf);
574 break;
575 case 'q':
576 dec = decode_q_segment(&piecebuf, 1);
577 break;
579 if (metainfo_charset)
580 convert_to_utf8(dec, charset_q.buf);
582 strbuf_addbuf(&outbuf, dec);
583 strbuf_release(dec);
584 free(dec);
585 in = ep + 2;
587 strbuf_addstr(&outbuf, in);
588 strbuf_reset(it);
589 strbuf_addbuf(it, &outbuf);
590 decode_header_bq_out:
591 strbuf_release(&outbuf);
592 strbuf_release(&charset_q);
593 strbuf_release(&piecebuf);
594 return rfc2047;
597 static void decode_header(struct strbuf *it)
599 if (decode_header_bq(it))
600 return;
601 /* otherwise "it" is a straight copy of the input.
602 * This can be binary guck but there is no charset specified.
604 if (metainfo_charset)
605 convert_to_utf8(it, "");
608 static void decode_transfer_encoding(struct strbuf *line)
610 struct strbuf *ret;
612 switch (transfer_encoding) {
613 case TE_QP:
614 ret = decode_q_segment(line, 0);
615 break;
616 case TE_BASE64:
617 ret = decode_b_segment(line);
618 break;
619 case TE_DONTCARE:
620 default:
621 return;
623 strbuf_reset(line);
624 strbuf_addbuf(line, ret);
625 strbuf_release(ret);
626 free(ret);
629 static void handle_filter(struct strbuf *line);
631 static int find_boundary(void)
633 while (!strbuf_getline(&line, fin, '\n')) {
634 if (*content_top && is_multipart_boundary(&line))
635 return 1;
637 return 0;
640 static int handle_boundary(void)
642 struct strbuf newline = STRBUF_INIT;
644 strbuf_addch(&newline, '\n');
645 again:
646 if (line.len >= (*content_top)->len + 2 &&
647 !memcmp(line.buf + (*content_top)->len, "--", 2)) {
648 /* we hit an end boundary */
649 /* pop the current boundary off the stack */
650 strbuf_release(*content_top);
651 free(*content_top);
652 *content_top = NULL;
654 /* technically won't happen as is_multipart_boundary()
655 will fail first. But just in case..
657 if (--content_top < content) {
658 fprintf(stderr, "Detected mismatched boundaries, "
659 "can't recover\n");
660 exit(1);
662 handle_filter(&newline);
663 strbuf_release(&newline);
665 /* skip to the next boundary */
666 if (!find_boundary())
667 return 0;
668 goto again;
671 /* set some defaults */
672 transfer_encoding = TE_DONTCARE;
673 strbuf_reset(&charset);
674 message_type = TYPE_TEXT;
676 /* slurp in this section's info */
677 while (read_one_header_line(&line, fin))
678 check_header(&line, p_hdr_data, 0);
680 strbuf_release(&newline);
681 /* replenish line */
682 if (strbuf_getline(&line, fin, '\n'))
683 return 0;
684 strbuf_addch(&line, '\n');
685 return 1;
688 static inline int patchbreak(const struct strbuf *line)
690 size_t i;
692 /* Beginning of a "diff -" header? */
693 if (!prefixcmp(line->buf, "diff -"))
694 return 1;
696 /* CVS "Index: " line? */
697 if (!prefixcmp(line->buf, "Index: "))
698 return 1;
701 * "--- <filename>" starts patches without headers
702 * "---<sp>*" is a manual separator
704 if (line->len < 4)
705 return 0;
707 if (!prefixcmp(line->buf, "---")) {
708 /* space followed by a filename? */
709 if (line->buf[3] == ' ' && !isspace(line->buf[4]))
710 return 1;
711 /* Just whitespace? */
712 for (i = 3; i < line->len; i++) {
713 unsigned char c = line->buf[i];
714 if (c == '\n')
715 return 1;
716 if (!isspace(c))
717 break;
719 return 0;
721 return 0;
724 static int is_scissors_line(const struct strbuf *line)
726 size_t i, len = line->len;
727 int scissors = 0, gap = 0;
728 int first_nonblank = -1;
729 int last_nonblank = 0, visible, perforation = 0, in_perforation = 0;
730 const char *buf = line->buf;
732 for (i = 0; i < len; i++) {
733 if (isspace(buf[i])) {
734 if (in_perforation) {
735 perforation++;
736 gap++;
738 continue;
740 last_nonblank = i;
741 if (first_nonblank < 0)
742 first_nonblank = i;
743 if (buf[i] == '-') {
744 in_perforation = 1;
745 perforation++;
746 continue;
748 if (i + 1 < len &&
749 (!memcmp(buf + i, ">8", 2) || !memcmp(buf + i, "8<", 2) ||
750 !memcmp(buf + i, ">%", 2) || !memcmp(buf + i, "%<", 2))) {
751 in_perforation = 1;
752 perforation += 2;
753 scissors += 2;
754 i++;
755 continue;
757 in_perforation = 0;
761 * The mark must be at least 8 bytes long (e.g. "-- >8 --").
762 * Even though there can be arbitrary cruft on the same line
763 * (e.g. "cut here"), in order to avoid misidentification, the
764 * perforation must occupy more than a third of the visible
765 * width of the line, and dashes and scissors must occupy more
766 * than half of the perforation.
769 visible = last_nonblank - first_nonblank + 1;
770 return (scissors && 8 <= visible &&
771 visible < perforation * 3 &&
772 gap * 2 < perforation);
775 static int handle_commit_msg(struct strbuf *line)
777 static int still_looking = 1;
779 if (!cmitmsg)
780 return 0;
782 if (still_looking) {
783 if (!line->len || (line->len == 1 && line->buf[0] == '\n'))
784 return 0;
787 if (use_inbody_headers && still_looking) {
788 still_looking = check_header(line, s_hdr_data, 0);
789 if (still_looking)
790 return 0;
791 } else
792 /* Only trim the first (blank) line of the commit message
793 * when ignoring in-body headers.
795 still_looking = 0;
797 /* normalize the log message to UTF-8. */
798 if (metainfo_charset)
799 convert_to_utf8(line, charset.buf);
801 if (use_scissors && is_scissors_line(line)) {
802 int i;
803 if (fseek(cmitmsg, 0L, SEEK_SET))
804 die_errno("Could not rewind output message file");
805 if (ftruncate(fileno(cmitmsg), 0))
806 die_errno("Could not truncate output message file at scissors");
807 still_looking = 1;
810 * We may have already read "secondary headers"; purge
811 * them to give ourselves a clean restart.
813 for (i = 0; header[i]; i++) {
814 if (s_hdr_data[i])
815 strbuf_release(s_hdr_data[i]);
816 s_hdr_data[i] = NULL;
818 return 0;
821 if (patchbreak(line)) {
822 fclose(cmitmsg);
823 cmitmsg = NULL;
824 return 1;
827 fputs(line->buf, cmitmsg);
828 return 0;
831 static void handle_patch(const struct strbuf *line)
833 fwrite(line->buf, 1, line->len, patchfile);
834 patch_lines++;
837 static void handle_filter(struct strbuf *line)
839 static int filter = 0;
841 /* filter tells us which part we left off on */
842 switch (filter) {
843 case 0:
844 if (!handle_commit_msg(line))
845 break;
846 filter++;
847 case 1:
848 handle_patch(line);
849 break;
853 static void handle_body(void)
855 struct strbuf prev = STRBUF_INIT;
857 /* Skip up to the first boundary */
858 if (*content_top) {
859 if (!find_boundary())
860 goto handle_body_out;
863 do {
864 /* process any boundary lines */
865 if (*content_top && is_multipart_boundary(&line)) {
866 /* flush any leftover */
867 if (prev.len) {
868 handle_filter(&prev);
869 strbuf_reset(&prev);
871 if (!handle_boundary())
872 goto handle_body_out;
875 /* Unwrap transfer encoding */
876 decode_transfer_encoding(&line);
878 switch (transfer_encoding) {
879 case TE_BASE64:
880 case TE_QP:
882 struct strbuf **lines, **it, *sb;
884 /* Prepend any previous partial lines */
885 strbuf_insert(&line, 0, prev.buf, prev.len);
886 strbuf_reset(&prev);
888 /* binary data most likely doesn't have newlines */
889 if (message_type != TYPE_TEXT) {
890 handle_filter(&line);
891 break;
894 * This is a decoded line that may contain
895 * multiple new lines. Pass only one chunk
896 * at a time to handle_filter()
898 lines = strbuf_split(&line, '\n');
899 for (it = lines; (sb = *it); it++) {
900 if (*(it + 1) == NULL) /* The last line */
901 if (sb->buf[sb->len - 1] != '\n') {
902 /* Partial line, save it for later. */
903 strbuf_addbuf(&prev, sb);
904 break;
906 handle_filter(sb);
909 * The partial chunk is saved in "prev" and will be
910 * appended by the next iteration of read_line_with_nul().
912 strbuf_list_free(lines);
913 break;
915 default:
916 handle_filter(&line);
919 } while (!strbuf_getwholeline(&line, fin, '\n'));
921 handle_body_out:
922 strbuf_release(&prev);
925 static void output_header_lines(FILE *fout, const char *hdr, const struct strbuf *data)
927 const char *sp = data->buf;
928 while (1) {
929 char *ep = strchr(sp, '\n');
930 int len;
931 if (!ep)
932 len = strlen(sp);
933 else
934 len = ep - sp;
935 fprintf(fout, "%s: %.*s\n", hdr, len, sp);
936 if (!ep)
937 break;
938 sp = ep + 1;
942 static void handle_info(void)
944 struct strbuf *hdr;
945 int i;
947 for (i = 0; header[i]; i++) {
948 /* only print inbody headers if we output a patch file */
949 if (patch_lines && s_hdr_data[i])
950 hdr = s_hdr_data[i];
951 else if (p_hdr_data[i])
952 hdr = p_hdr_data[i];
953 else
954 continue;
956 if (!memcmp(header[i], "Subject", 7)) {
957 if (!keep_subject) {
958 cleanup_subject(hdr);
959 cleanup_space(hdr);
961 output_header_lines(fout, "Subject", hdr);
962 } else if (!memcmp(header[i], "From", 4)) {
963 cleanup_space(hdr);
964 handle_from(hdr);
965 fprintf(fout, "Author: %s\n", name.buf);
966 fprintf(fout, "Email: %s\n", email.buf);
967 } else {
968 cleanup_space(hdr);
969 fprintf(fout, "%s: %s\n", header[i], hdr->buf);
972 fprintf(fout, "\n");
975 static int mailinfo(FILE *in, FILE *out, const char *msg, const char *patch)
977 int peek;
978 fin = in;
979 fout = out;
981 cmitmsg = fopen(msg, "w");
982 if (!cmitmsg) {
983 perror(msg);
984 return -1;
986 patchfile = fopen(patch, "w");
987 if (!patchfile) {
988 perror(patch);
989 fclose(cmitmsg);
990 return -1;
993 p_hdr_data = xcalloc(MAX_HDR_PARSED, sizeof(*p_hdr_data));
994 s_hdr_data = xcalloc(MAX_HDR_PARSED, sizeof(*s_hdr_data));
996 do {
997 peek = fgetc(in);
998 } while (isspace(peek));
999 ungetc(peek, in);
1001 /* process the email header */
1002 while (read_one_header_line(&line, fin))
1003 check_header(&line, p_hdr_data, 1);
1005 handle_body();
1006 handle_info();
1008 return 0;
1011 static int git_mailinfo_config(const char *var, const char *value, void *unused)
1013 if (prefixcmp(var, "mailinfo."))
1014 return git_default_config(var, value, unused);
1015 if (!strcmp(var, "mailinfo.scissors")) {
1016 use_scissors = git_config_bool(var, value);
1017 return 0;
1019 /* perhaps others here */
1020 return 0;
1023 static const char mailinfo_usage[] =
1024 "git mailinfo [-k|-b] [-u | --encoding=<encoding> | -n] [--scissors | --no-scissors] msg patch < mail >info";
1026 int cmd_mailinfo(int argc, const char **argv, const char *prefix)
1028 const char *def_charset;
1030 /* NEEDSWORK: might want to do the optional .git/ directory
1031 * discovery
1033 git_config(git_mailinfo_config, NULL);
1035 def_charset = get_commit_output_encoding();
1036 metainfo_charset = def_charset;
1038 while (1 < argc && argv[1][0] == '-') {
1039 if (!strcmp(argv[1], "-k"))
1040 keep_subject = 1;
1041 else if (!strcmp(argv[1], "-b"))
1042 keep_non_patch_brackets_in_subject = 1;
1043 else if (!strcmp(argv[1], "-u"))
1044 metainfo_charset = def_charset;
1045 else if (!strcmp(argv[1], "-n"))
1046 metainfo_charset = NULL;
1047 else if (!prefixcmp(argv[1], "--encoding="))
1048 metainfo_charset = argv[1] + 11;
1049 else if (!strcmp(argv[1], "--scissors"))
1050 use_scissors = 1;
1051 else if (!strcmp(argv[1], "--no-scissors"))
1052 use_scissors = 0;
1053 else if (!strcmp(argv[1], "--no-inbody-headers"))
1054 use_inbody_headers = 0;
1055 else
1056 usage(mailinfo_usage);
1057 argc--; argv++;
1060 if (argc != 3)
1061 usage(mailinfo_usage);
1063 return !!mailinfo(stdin, stdout, argv[1], argv[2]);