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Fix signedness on return value from xread()
[git/jnareb-git.git] / commit.c
blobd01833d8137ece2f4a1d95d8b85d8ed54ecbd16b
1 #include "cache.h"
2 #include "tag.h"
3 #include "commit.h"
4 #include "pkt-line.h"
5 #include "utf8.h"
6 #include "interpolate.h"
7 #include "diff.h"
8 #include "revision.h"
9
10 int save_commit_buffer = 1;
11
12 struct sort_node
13 {
14 /*
15 * the number of children of the associated commit
16 * that also occur in the list being sorted.
17 */
18 unsigned int indegree;
19
20 /*
21 * reference to original list item that we will re-use
22 * on output.
23 */
24 struct commit_list * list_item;
25
26 };
27
28 const char *commit_type = "commit";
29
30 struct cmt_fmt_map {
31 const char *n;
32 size_t cmp_len;
33 enum cmit_fmt v;
34 } cmt_fmts[] = {
35 { "raw", 1, CMIT_FMT_RAW },
36 { "medium", 1, CMIT_FMT_MEDIUM },
37 { "short", 1, CMIT_FMT_SHORT },
38 { "email", 1, CMIT_FMT_EMAIL },
39 { "full", 5, CMIT_FMT_FULL },
40 { "fuller", 5, CMIT_FMT_FULLER },
41 { "oneline", 1, CMIT_FMT_ONELINE },
42 { "format:", 7, CMIT_FMT_USERFORMAT},
43 };
44
45 static char *user_format;
46
47 enum cmit_fmt get_commit_format(const char *arg)
48 {
49 int i;
50
51 if (!arg || !*arg)
52 return CMIT_FMT_DEFAULT;
53 if (*arg == '=')
54 arg++;
55 if (!prefixcmp(arg, "format:")) {
56 if (user_format)
57 free(user_format);
58 user_format = xstrdup(arg + 7);
59 return CMIT_FMT_USERFORMAT;
60 }
61 for (i = 0; i < ARRAY_SIZE(cmt_fmts); i++) {
62 if (!strncmp(arg, cmt_fmts[i].n, cmt_fmts[i].cmp_len) &&
63 !strncmp(arg, cmt_fmts[i].n, strlen(arg)))
64 return cmt_fmts[i].v;
65 }
66
67 die("invalid --pretty format: %s", arg);
68 }
69
70 static struct commit *check_commit(struct object *obj,
71 const unsigned char *sha1,
72 int quiet)
73 {
74 if (obj->type != OBJ_COMMIT) {
75 if (!quiet)
76 error("Object %s is a %s, not a commit",
77 sha1_to_hex(sha1), typename(obj->type));
78 return NULL;
79 }
80 return (struct commit *) obj;
81 }
82
83 struct commit *lookup_commit_reference_gently(const unsigned char *sha1,
84 int quiet)
85 {
86 struct object *obj = deref_tag(parse_object(sha1), NULL, 0);
87
88 if (!obj)
89 return NULL;
90 return check_commit(obj, sha1, quiet);
91 }
92
93 struct commit *lookup_commit_reference(const unsigned char *sha1)
94 {
95 return lookup_commit_reference_gently(sha1, 0);
96 }
97
98 struct commit *lookup_commit(const unsigned char *sha1)
99 {
100 struct object *obj = lookup_object(sha1);
101 if (!obj)
102 return create_object(sha1, OBJ_COMMIT, alloc_commit_node());
103 if (!obj->type)
104 obj->type = OBJ_COMMIT;
105 return check_commit(obj, sha1, 0);
106 }
107
108 static unsigned long parse_commit_date(const char *buf)
109 {
110 unsigned long date;
111
112 if (memcmp(buf, "author", 6))
113 return 0;
114 while (*buf++ != '\n')
115 /* nada */;
116 if (memcmp(buf, "committer", 9))
117 return 0;
118 while (*buf++ != '>')
119 /* nada */;
120 date = strtoul(buf, NULL, 10);
121 if (date == ULONG_MAX)
122 date = 0;
123 return date;
124 }
125
126 static struct commit_graft **commit_graft;
127 static int commit_graft_alloc, commit_graft_nr;
128
129 static int commit_graft_pos(const unsigned char *sha1)
130 {
131 int lo, hi;
132 lo = 0;
133 hi = commit_graft_nr;
134 while (lo < hi) {
135 int mi = (lo + hi) / 2;
136 struct commit_graft *graft = commit_graft[mi];
137 int cmp = hashcmp(sha1, graft->sha1);
138 if (!cmp)
139 return mi;
140 if (cmp < 0)
141 hi = mi;
142 else
143 lo = mi + 1;
144 }
145 return -lo - 1;
146 }
147
148 int register_commit_graft(struct commit_graft *graft, int ignore_dups)
149 {
150 int pos = commit_graft_pos(graft->sha1);
151
152 if (0 <= pos) {
153 if (ignore_dups)
154 free(graft);
155 else {
156 free(commit_graft[pos]);
157 commit_graft[pos] = graft;
158 }
159 return 1;
160 }
161 pos = -pos - 1;
162 if (commit_graft_alloc <= ++commit_graft_nr) {
163 commit_graft_alloc = alloc_nr(commit_graft_alloc);
164 commit_graft = xrealloc(commit_graft,
165 sizeof(*commit_graft) *
166 commit_graft_alloc);
167 }
168 if (pos < commit_graft_nr)
169 memmove(commit_graft + pos + 1,
170 commit_graft + pos,
171 (commit_graft_nr - pos - 1) *
172 sizeof(*commit_graft));
173 commit_graft[pos] = graft;
174 return 0;
175 }
176
177 struct commit_graft *read_graft_line(char *buf, int len)
178 {
179 /* The format is just "Commit Parent1 Parent2 ...\n" */
180 int i;
181 struct commit_graft *graft = NULL;
182
183 if (buf[len-1] == '\n')
184 buf[--len] = 0;
185 if (buf[0] == '#' || buf[0] == '\0')
186 return NULL;
187 if ((len + 1) % 41) {
188 bad_graft_data:
189 error("bad graft data: %s", buf);
190 free(graft);
191 return NULL;
192 }
193 i = (len + 1) / 41 - 1;
194 graft = xmalloc(sizeof(*graft) + 20 * i);
195 graft->nr_parent = i;
196 if (get_sha1_hex(buf, graft->sha1))
197 goto bad_graft_data;
198 for (i = 40; i < len; i += 41) {
199 if (buf[i] != ' ')
200 goto bad_graft_data;
201 if (get_sha1_hex(buf + i + 1, graft->parent[i/41]))
202 goto bad_graft_data;
203 }
204 return graft;
205 }
206
207 int read_graft_file(const char *graft_file)
208 {
209 FILE *fp = fopen(graft_file, "r");
210 char buf[1024];
211 if (!fp)
212 return -1;
213 while (fgets(buf, sizeof(buf), fp)) {
214 /* The format is just "Commit Parent1 Parent2 ...\n" */
215 int len = strlen(buf);
216 struct commit_graft *graft = read_graft_line(buf, len);
217 if (!graft)
218 continue;
219 if (register_commit_graft(graft, 1))
220 error("duplicate graft data: %s", buf);
221 }
222 fclose(fp);
223 return 0;
224 }
225
226 static void prepare_commit_graft(void)
227 {
228 static int commit_graft_prepared;
229 char *graft_file;
230
231 if (commit_graft_prepared)
232 return;
233 graft_file = get_graft_file();
234 read_graft_file(graft_file);
235 /* make sure shallows are read */
236 is_repository_shallow();
237 commit_graft_prepared = 1;
238 }
239
240 static struct commit_graft *lookup_commit_graft(const unsigned char *sha1)
241 {
242 int pos;
243 prepare_commit_graft();
244 pos = commit_graft_pos(sha1);
245 if (pos < 0)
246 return NULL;
247 return commit_graft[pos];
248 }
249
250 int write_shallow_commits(int fd, int use_pack_protocol)
251 {
252 int i, count = 0;
253 for (i = 0; i < commit_graft_nr; i++)
254 if (commit_graft[i]->nr_parent < 0) {
255 const char *hex =
256 sha1_to_hex(commit_graft[i]->sha1);
257 count++;
258 if (use_pack_protocol)
259 packet_write(fd, "shallow %s", hex);
260 else {
261 if (write_in_full(fd, hex, 40) != 40)
262 break;
263 if (write_in_full(fd, "\n", 1) != 1)
264 break;
265 }
266 }
267 return count;
268 }
269
270 int unregister_shallow(const unsigned char *sha1)
271 {
272 int pos = commit_graft_pos(sha1);
273 if (pos < 0)
274 return -1;
275 if (pos + 1 < commit_graft_nr)
276 memcpy(commit_graft + pos, commit_graft + pos + 1,
277 sizeof(struct commit_graft *)
278 * (commit_graft_nr - pos - 1));
279 commit_graft_nr--;
280 return 0;
281 }
282
283 int parse_commit_buffer(struct commit *item, void *buffer, unsigned long size)
284 {
285 char *tail = buffer;
286 char *bufptr = buffer;
287 unsigned char parent[20];
288 struct commit_list **pptr;
289 struct commit_graft *graft;
290 unsigned n_refs = 0;
291
292 if (item->object.parsed)
293 return 0;
294 item->object.parsed = 1;
295 tail += size;
296 if (tail <= bufptr + 5 || memcmp(bufptr, "tree ", 5))
297 return error("bogus commit object %s", sha1_to_hex(item->object.sha1));
298 if (tail <= bufptr + 45 || get_sha1_hex(bufptr + 5, parent) < 0)
299 return error("bad tree pointer in commit %s",
300 sha1_to_hex(item->object.sha1));
301 item->tree = lookup_tree(parent);
302 if (item->tree)
303 n_refs++;
304 bufptr += 46; /* "tree " + "hex sha1" + "\n" */
305 pptr = &item->parents;
306
307 graft = lookup_commit_graft(item->object.sha1);
308 while (bufptr + 48 < tail && !memcmp(bufptr, "parent ", 7)) {
309 struct commit *new_parent;
310
311 if (tail <= bufptr + 48 ||
312 get_sha1_hex(bufptr + 7, parent) ||
313 bufptr[47] != '\n')
314 return error("bad parents in commit %s", sha1_to_hex(item->object.sha1));
315 bufptr += 48;
316 if (graft)
317 continue;
318 new_parent = lookup_commit(parent);
319 if (new_parent) {
320 pptr = &commit_list_insert(new_parent, pptr)->next;
321 n_refs++;
322 }
323 }
324 if (graft) {
325 int i;
326 struct commit *new_parent;
327 for (i = 0; i < graft->nr_parent; i++) {
328 new_parent = lookup_commit(graft->parent[i]);
329 if (!new_parent)
330 continue;
331 pptr = &commit_list_insert(new_parent, pptr)->next;
332 n_refs++;
333 }
334 }
335 item->date = parse_commit_date(bufptr);
336
337 if (track_object_refs) {
338 unsigned i = 0;
339 struct commit_list *p;
340 struct object_refs *refs = alloc_object_refs(n_refs);
341 if (item->tree)
342 refs->ref[i++] = &item->tree->object;
343 for (p = item->parents; p; p = p->next)
344 refs->ref[i++] = &p->item->object;
345 set_object_refs(&item->object, refs);
346 }
347
348 return 0;
349 }
350
351 int parse_commit(struct commit *item)
352 {
353 enum object_type type;
354 void *buffer;
355 unsigned long size;
356 int ret;
357
358 if (item->object.parsed)
359 return 0;
360 buffer = read_sha1_file(item->object.sha1, &type, &size);
361 if (!buffer)
362 return error("Could not read %s",
363 sha1_to_hex(item->object.sha1));
364 if (type != OBJ_COMMIT) {
365 free(buffer);
366 return error("Object %s not a commit",
367 sha1_to_hex(item->object.sha1));
368 }
369 ret = parse_commit_buffer(item, buffer, size);
370 if (save_commit_buffer && !ret) {
371 item->buffer = buffer;
372 return 0;
373 }
374 free(buffer);
375 return ret;
376 }
377
378 struct commit_list *commit_list_insert(struct commit *item, struct commit_list **list_p)
379 {
380 struct commit_list *new_list = xmalloc(sizeof(struct commit_list));
381 new_list->item = item;
382 new_list->next = *list_p;
383 *list_p = new_list;
384 return new_list;
385 }
386
387 void free_commit_list(struct commit_list *list)
388 {
389 while (list) {
390 struct commit_list *temp = list;
391 list = temp->next;
392 free(temp);
393 }
394 }
395
396 struct commit_list * insert_by_date(struct commit *item, struct commit_list **list)
397 {
398 struct commit_list **pp = list;
399 struct commit_list *p;
400 while ((p = *pp) != NULL) {
401 if (p->item->date < item->date) {
402 break;
403 }
404 pp = &p->next;
405 }
406 return commit_list_insert(item, pp);
407 }
408
409
410 void sort_by_date(struct commit_list **list)
411 {
412 struct commit_list *ret = NULL;
413 while (*list) {
414 insert_by_date((*list)->item, &ret);
415 *list = (*list)->next;
416 }
417 *list = ret;
418 }
419
420 struct commit *pop_most_recent_commit(struct commit_list **list,
421 unsigned int mark)
422 {
423 struct commit *ret = (*list)->item;
424 struct commit_list *parents = ret->parents;
425 struct commit_list *old = *list;
426
427 *list = (*list)->next;
428 free(old);
429
430 while (parents) {
431 struct commit *commit = parents->item;
432 parse_commit(commit);
433 if (!(commit->object.flags & mark)) {
434 commit->object.flags |= mark;
435 insert_by_date(commit, list);
436 }
437 parents = parents->next;
438 }
439 return ret;
440 }
441
442 void clear_commit_marks(struct commit *commit, unsigned int mark)
443 {
444 struct commit_list *parents;
445
446 commit->object.flags &= ~mark;
447 parents = commit->parents;
448 while (parents) {
449 struct commit *parent = parents->item;
450
451 /* Have we already cleared this? */
452 if (mark & parent->object.flags)
453 clear_commit_marks(parent, mark);
454 parents = parents->next;
455 }
456 }
457
458 /*
459 * Generic support for pretty-printing the header
460 */
461 static int get_one_line(const char *msg, unsigned long len)
462 {
463 int ret = 0;
464
465 while (len--) {
466 char c = *msg++;
467 if (!c)
468 break;
469 ret++;
470 if (c == '\n')
471 break;
472 }
473 return ret;
474 }
475
476 /* High bit set, or ISO-2022-INT */
477 static int non_ascii(int ch)
478 {
479 ch = (ch & 0xff);
480 return ((ch & 0x80) || (ch == 0x1b));
481 }
482
483 static int is_rfc2047_special(char ch)
484 {
485 return (non_ascii(ch) || (ch == '=') || (ch == '?') || (ch == '_'));
486 }
487
488 static int add_rfc2047(char *buf, const char *line, int len,
489 const char *encoding)
490 {
491 char *bp = buf;
492 int i, needquote;
493 char q_encoding[128];
494 const char *q_encoding_fmt = "=?%s?q?";
495
496 for (i = needquote = 0; !needquote && i < len; i++) {
497 int ch = line[i];
498 if (non_ascii(ch))
499 needquote++;
500 if ((i + 1 < len) &&
501 (ch == '=' && line[i+1] == '?'))
502 needquote++;
503 }
504 if (!needquote)
505 return sprintf(buf, "%.*s", len, line);
506
507 i = snprintf(q_encoding, sizeof(q_encoding), q_encoding_fmt, encoding);
508 if (sizeof(q_encoding) < i)
509 die("Insanely long encoding name %s", encoding);
510 memcpy(bp, q_encoding, i);
511 bp += i;
512 for (i = 0; i < len; i++) {
513 unsigned ch = line[i] & 0xFF;
514 if (is_rfc2047_special(ch)) {
515 sprintf(bp, "=%02X", ch);
516 bp += 3;
517 }
518 else if (ch == ' ')
519 *bp++ = '_';
520 else
521 *bp++ = ch;
522 }
523 memcpy(bp, "?=", 2);
524 bp += 2;
525 return bp - buf;
526 }
527
528 static int add_user_info(const char *what, enum cmit_fmt fmt, char *buf,
529 const char *line, enum date_mode dmode,
530 const char *encoding)
531 {
532 char *date;
533 int namelen;
534 unsigned long time;
535 int tz, ret;
536 const char *filler = " ";
537
538 if (fmt == CMIT_FMT_ONELINE)
539 return 0;
540 date = strchr(line, '>');
541 if (!date)
542 return 0;
543 namelen = ++date - line;
544 time = strtoul(date, &date, 10);
545 tz = strtol(date, NULL, 10);
546
547 if (fmt == CMIT_FMT_EMAIL) {
548 char *name_tail = strchr(line, '<');
549 int display_name_length;
550 if (!name_tail)
551 return 0;
552 while (line < name_tail && isspace(name_tail[-1]))
553 name_tail--;
554 display_name_length = name_tail - line;
555 filler = "";
556 strcpy(buf, "From: ");
557 ret = strlen(buf);
558 ret += add_rfc2047(buf + ret, line, display_name_length,
559 encoding);
560 memcpy(buf + ret, name_tail, namelen - display_name_length);
561 ret += namelen - display_name_length;
562 buf[ret++] = '\n';
563 }
564 else {
565 ret = sprintf(buf, "%s: %.*s%.*s\n", what,
566 (fmt == CMIT_FMT_FULLER) ? 4 : 0,
567 filler, namelen, line);
568 }
569 switch (fmt) {
570 case CMIT_FMT_MEDIUM:
571 ret += sprintf(buf + ret, "Date: %s\n",
572 show_date(time, tz, dmode));
573 break;
574 case CMIT_FMT_EMAIL:
575 ret += sprintf(buf + ret, "Date: %s\n",
576 show_rfc2822_date(time, tz));
577 break;
578 case CMIT_FMT_FULLER:
579 ret += sprintf(buf + ret, "%sDate: %s\n", what,
580 show_date(time, tz, dmode));
581 break;
582 default:
583 /* notin' */
584 break;
585 }
586 return ret;
587 }
588
589 static int is_empty_line(const char *line, int *len_p)
590 {
591 int len = *len_p;
592 while (len && isspace(line[len-1]))
593 len--;
594 *len_p = len;
595 return !len;
596 }
597
598 static int add_merge_info(enum cmit_fmt fmt, char *buf, const struct commit *commit, int abbrev)
599 {
600 struct commit_list *parent = commit->parents;
601 int offset;
602
603 if ((fmt == CMIT_FMT_ONELINE) || (fmt == CMIT_FMT_EMAIL) ||
604 !parent || !parent->next)
605 return 0;
606
607 offset = sprintf(buf, "Merge:");
608
609 while (parent) {
610 struct commit *p = parent->item;
611 const char *hex = NULL;
612 const char *dots;
613 if (abbrev)
614 hex = find_unique_abbrev(p->object.sha1, abbrev);
615 if (!hex)
616 hex = sha1_to_hex(p->object.sha1);
617 dots = (abbrev && strlen(hex) != 40) ? "..." : "";
618 parent = parent->next;
619
620 offset += sprintf(buf + offset, " %s%s", hex, dots);
621 }
622 buf[offset++] = '\n';
623 return offset;
624 }
625
626 static char *get_header(const struct commit *commit, const char *key)
627 {
628 int key_len = strlen(key);
629 const char *line = commit->buffer;
630
631 for (;;) {
632 const char *eol = strchr(line, '\n'), *next;
633
634 if (line == eol)
635 return NULL;
636 if (!eol) {
637 eol = line + strlen(line);
638 next = NULL;
639 } else
640 next = eol + 1;
641 if (eol - line > key_len &&
642 !strncmp(line, key, key_len) &&
643 line[key_len] == ' ') {
644 int len = eol - line - key_len;
645 char *ret = xmalloc(len);
646 memcpy(ret, line + key_len + 1, len - 1);
647 ret[len - 1] = '\0';
648 return ret;
649 }
650 line = next;
651 }
652 }
653
654 static char *replace_encoding_header(char *buf, const char *encoding)
655 {
656 char *encoding_header = strstr(buf, "\nencoding ");
657 char *header_end = strstr(buf, "\n\n");
658 char *end_of_encoding_header;
659 int encoding_header_pos;
660 int encoding_header_len;
661 int new_len;
662 int need_len;
663 int buflen = strlen(buf) + 1;
664
665 if (!header_end)
666 header_end = buf + buflen;
667 if (!encoding_header || encoding_header >= header_end)
668 return buf;
669 encoding_header++;
670 end_of_encoding_header = strchr(encoding_header, '\n');
671 if (!end_of_encoding_header)
672 return buf; /* should not happen but be defensive */
673 end_of_encoding_header++;
674
675 encoding_header_len = end_of_encoding_header - encoding_header;
676 encoding_header_pos = encoding_header - buf;
677
678 if (is_encoding_utf8(encoding)) {
679 /* we have re-coded to UTF-8; drop the header */
680 memmove(encoding_header, end_of_encoding_header,
681 buflen - (encoding_header_pos + encoding_header_len));
682 return buf;
683 }
684 new_len = strlen(encoding);
685 need_len = new_len + strlen("encoding \n");
686 if (encoding_header_len < need_len) {
687 buf = xrealloc(buf, buflen + (need_len - encoding_header_len));
688 encoding_header = buf + encoding_header_pos;
689 end_of_encoding_header = encoding_header + encoding_header_len;
690 }
691 memmove(end_of_encoding_header + (need_len - encoding_header_len),
692 end_of_encoding_header,
693 buflen - (encoding_header_pos + encoding_header_len));
694 memcpy(encoding_header + 9, encoding, strlen(encoding));
695 encoding_header[9 + new_len] = '\n';
696 return buf;
697 }
698
699 static char *logmsg_reencode(const struct commit *commit,
700 const char *output_encoding)
701 {
702 static const char *utf8 = "utf-8";
703 const char *use_encoding;
704 char *encoding;
705 char *out;
706
707 if (!*output_encoding)
708 return NULL;
709 encoding = get_header(commit, "encoding");
710 use_encoding = encoding ? encoding : utf8;
711 if (!strcmp(use_encoding, output_encoding))
712 out = xstrdup(commit->buffer);
713 else
714 out = reencode_string(commit->buffer,
715 output_encoding, use_encoding);
716 if (out)
717 out = replace_encoding_header(out, output_encoding);
718
719 free(encoding);
720 return out;
721 }
722
723 static void fill_person(struct interp *table, const char *msg, int len)
724 {
725 int start, end, tz = 0;
726 unsigned long date;
727 char *ep;
728
729 /* parse name */
730 for (end = 0; end < len && msg[end] != '<'; end++)
731 ; /* do nothing */
732 start = end + 1;
733 while (end > 0 && isspace(msg[end - 1]))
734 end--;
735 table[0].value = xstrndup(msg, end);
736
737 if (start >= len)
738 return;
739
740 /* parse email */
741 for (end = start + 1; end < len && msg[end] != '>'; end++)
742 ; /* do nothing */
743
744 if (end >= len)
745 return;
746
747 table[1].value = xstrndup(msg + start, end - start);
748
749 /* parse date */
750 for (start = end + 1; start < len && isspace(msg[start]); start++)
751 ; /* do nothing */
752 if (start >= len)
753 return;
754 date = strtoul(msg + start, &ep, 10);
755 if (msg + start == ep)
756 return;
757
758 table[5].value = xstrndup(msg + start, ep - (msg + start));
759
760 /* parse tz */
761 for (start = ep - msg + 1; start < len && isspace(msg[start]); start++)
762 ; /* do nothing */
763 if (start + 1 < len) {
764 tz = strtoul(msg + start + 1, NULL, 10);
765 if (msg[start] == '-')
766 tz = -tz;
767 }
768
769 interp_set_entry(table, 2, show_date(date, tz, 0));
770 interp_set_entry(table, 3, show_rfc2822_date(date, tz));
771 interp_set_entry(table, 4, show_date(date, tz, 1));
772 }
773
774 static long format_commit_message(const struct commit *commit,
775 const char *msg, char *buf, unsigned long space)
776 {
777 struct interp table[] = {
778 { "%H" }, /* commit hash */
779 { "%h" }, /* abbreviated commit hash */
780 { "%T" }, /* tree hash */
781 { "%t" }, /* abbreviated tree hash */
782 { "%P" }, /* parent hashes */
783 { "%p" }, /* abbreviated parent hashes */
784 { "%an" }, /* author name */
785 { "%ae" }, /* author email */
786 { "%ad" }, /* author date */
787 { "%aD" }, /* author date, RFC2822 style */
788 { "%ar" }, /* author date, relative */
789 { "%at" }, /* author date, UNIX timestamp */
790 { "%cn" }, /* committer name */
791 { "%ce" }, /* committer email */
792 { "%cd" }, /* committer date */
793 { "%cD" }, /* committer date, RFC2822 style */
794 { "%cr" }, /* committer date, relative */
795 { "%ct" }, /* committer date, UNIX timestamp */
796 { "%e" }, /* encoding */
797 { "%s" }, /* subject */
798 { "%b" }, /* body */
799 { "%Cred" }, /* red */
800 { "%Cgreen" }, /* green */
801 { "%Cblue" }, /* blue */
802 { "%Creset" }, /* reset color */
803 { "%n" }, /* newline */
804 { "%m" }, /* left/right/bottom */
805 };
806 enum interp_index {
807 IHASH = 0, IHASH_ABBREV,
808 ITREE, ITREE_ABBREV,
809 IPARENTS, IPARENTS_ABBREV,
810 IAUTHOR_NAME, IAUTHOR_EMAIL,
811 IAUTHOR_DATE, IAUTHOR_DATE_RFC2822, IAUTHOR_DATE_RELATIVE,
812 IAUTHOR_TIMESTAMP,
813 ICOMMITTER_NAME, ICOMMITTER_EMAIL,
814 ICOMMITTER_DATE, ICOMMITTER_DATE_RFC2822,
815 ICOMMITTER_DATE_RELATIVE, ICOMMITTER_TIMESTAMP,
816 IENCODING,
817 ISUBJECT,
818 IBODY,
819 IRED, IGREEN, IBLUE, IRESET_COLOR,
820 INEWLINE,
821 ILEFT_RIGHT,
822 };
823 struct commit_list *p;
824 char parents[1024];
825 int i;
826 enum { HEADER, SUBJECT, BODY } state;
827
828 if (ILEFT_RIGHT + 1 != ARRAY_SIZE(table))
829 die("invalid interp table!");
830
831 /* these are independent of the commit */
832 interp_set_entry(table, IRED, "\033[31m");
833 interp_set_entry(table, IGREEN, "\033[32m");
834 interp_set_entry(table, IBLUE, "\033[34m");
835 interp_set_entry(table, IRESET_COLOR, "\033[m");
836 interp_set_entry(table, INEWLINE, "\n");
837
838 /* these depend on the commit */
839 if (!commit->object.parsed)
840 parse_object(commit->object.sha1);
841 interp_set_entry(table, IHASH, sha1_to_hex(commit->object.sha1));
842 interp_set_entry(table, IHASH_ABBREV,
843 find_unique_abbrev(commit->object.sha1,
844 DEFAULT_ABBREV));
845 interp_set_entry(table, ITREE, sha1_to_hex(commit->tree->object.sha1));
846 interp_set_entry(table, ITREE_ABBREV,
847 find_unique_abbrev(commit->tree->object.sha1,
848 DEFAULT_ABBREV));
849 interp_set_entry(table, ILEFT_RIGHT,
850 (commit->object.flags & BOUNDARY)
851 ? "-"
852 : (commit->object.flags & SYMMETRIC_LEFT)
853 ? "<"
854 : ">");
855
856 parents[1] = 0;
857 for (i = 0, p = commit->parents;
858 p && i < sizeof(parents) - 1;
859 p = p->next)
860 i += snprintf(parents + i, sizeof(parents) - i - 1, " %s",
861 sha1_to_hex(p->item->object.sha1));
862 interp_set_entry(table, IPARENTS, parents + 1);
863
864 parents[1] = 0;
865 for (i = 0, p = commit->parents;
866 p && i < sizeof(parents) - 1;
867 p = p->next)
868 i += snprintf(parents + i, sizeof(parents) - i - 1, " %s",
869 find_unique_abbrev(p->item->object.sha1,
870 DEFAULT_ABBREV));
871 interp_set_entry(table, IPARENTS_ABBREV, parents + 1);
872
873 for (i = 0, state = HEADER; msg[i] && state < BODY; i++) {
874 int eol;
875 for (eol = i; msg[eol] && msg[eol] != '\n'; eol++)
876 ; /* do nothing */
877
878 if (state == SUBJECT) {
879 table[ISUBJECT].value = xstrndup(msg + i, eol - i);
880 i = eol;
881 }
882 if (i == eol) {
883 state++;
884 /* strip empty lines */
885 while (msg[eol + 1] == '\n')
886 eol++;
887 } else if (!prefixcmp(msg + i, "author "))
888 fill_person(table + IAUTHOR_NAME,
889 msg + i + 7, eol - i - 7);
890 else if (!prefixcmp(msg + i, "committer "))
891 fill_person(table + ICOMMITTER_NAME,
892 msg + i + 10, eol - i - 10);
893 else if (!prefixcmp(msg + i, "encoding "))
894 table[IENCODING].value =
895 xstrndup(msg + i + 9, eol - i - 9);
896 i = eol;
897 }
898 if (msg[i])
899 table[IBODY].value = xstrdup(msg + i);
900 for (i = 0; i < ARRAY_SIZE(table); i++)
901 if (!table[i].value)
902 interp_set_entry(table, i, "<unknown>");
903
904 interpolate(buf, space, user_format, table, ARRAY_SIZE(table));
905 interp_clear_table(table, ARRAY_SIZE(table));
906
907 return strlen(buf);
908 }
909
910 unsigned long pretty_print_commit(enum cmit_fmt fmt,
911 const struct commit *commit,
912 unsigned long len,
913 char *buf, unsigned long space,
914 int abbrev, const char *subject,
915 const char *after_subject,
916 enum date_mode dmode)
917 {
918 int hdr = 1, body = 0, seen_title = 0;
919 unsigned long offset = 0;
920 int indent = 4;
921 int parents_shown = 0;
922 const char *msg = commit->buffer;
923 int plain_non_ascii = 0;
924 char *reencoded;
925 const char *encoding;
926
927 if (fmt == CMIT_FMT_USERFORMAT)
928 return format_commit_message(commit, msg, buf, space);
929
930 encoding = (git_log_output_encoding
931 ? git_log_output_encoding
932 : git_commit_encoding);
933 if (!encoding)
934 encoding = "utf-8";
935 reencoded = logmsg_reencode(commit, encoding);
936 if (reencoded)
937 msg = reencoded;
938
939 if (fmt == CMIT_FMT_ONELINE || fmt == CMIT_FMT_EMAIL)
940 indent = 0;
941
942 /* After-subject is used to pass in Content-Type: multipart
943 * MIME header; in that case we do not have to do the
944 * plaintext content type even if the commit message has
945 * non 7-bit ASCII character. Otherwise, check if we need
946 * to say this is not a 7-bit ASCII.
947 */
948 if (fmt == CMIT_FMT_EMAIL && !after_subject) {
949 int i, ch, in_body;
950
951 for (in_body = i = 0; (ch = msg[i]) && i < len; i++) {
952 if (!in_body) {
953 /* author could be non 7-bit ASCII but
954 * the log may be so; skip over the
955 * header part first.
956 */
957 if (ch == '\n' &&
958 i + 1 < len && msg[i+1] == '\n')
959 in_body = 1;
960 }
961 else if (non_ascii(ch)) {
962 plain_non_ascii = 1;
963 break;
964 }
965 }
966 }
967
968 for (;;) {
969 const char *line = msg;
970 int linelen = get_one_line(msg, len);
971
972 if (!linelen)
973 break;
974
975 /*
976 * We want some slop for indentation and a possible
977 * final "...". Thus the "+ 20".
978 */
979 if (offset + linelen + 20 > space) {
980 memcpy(buf + offset, " ...\n", 8);
981 offset += 8;
982 break;
983 }
984
985 msg += linelen;
986 len -= linelen;
987 if (hdr) {
988 if (linelen == 1) {
989 hdr = 0;
990 if ((fmt != CMIT_FMT_ONELINE) && !subject)
991 buf[offset++] = '\n';
992 continue;
993 }
994 if (fmt == CMIT_FMT_RAW) {
995 memcpy(buf + offset, line, linelen);
996 offset += linelen;
997 continue;
998 }
999 if (!memcmp(line, "parent ", 7)) {
1000 if (linelen != 48)
1001 die("bad parent line in commit");
1002 continue;
1003 }
1004
1005 if (!parents_shown) {
1006 offset += add_merge_info(fmt, buf + offset,
1007 commit, abbrev);
1008 parents_shown = 1;
1009 continue;
1010 }
1011 /*
1012 * MEDIUM == DEFAULT shows only author with dates.
1013 * FULL shows both authors but not dates.
1014 * FULLER shows both authors and dates.
1015 */
1016 if (!memcmp(line, "author ", 7))
1017 offset += add_user_info("Author", fmt,
1018 buf + offset,
1019 line + 7,
1020 dmode,
1021 encoding);
1022 if (!memcmp(line, "committer ", 10) &&
1023 (fmt == CMIT_FMT_FULL || fmt == CMIT_FMT_FULLER))
1024 offset += add_user_info("Commit", fmt,
1025 buf + offset,
1026 line + 10,
1027 dmode,
1028 encoding);
1029 continue;
1030 }
1031
1032 if (!subject)
1033 body = 1;
1034
1035 if (is_empty_line(line, &linelen)) {
1036 if (!seen_title)
1037 continue;
1038 if (!body)
1039 continue;
1040 if (subject)
1041 continue;
1042 if (fmt == CMIT_FMT_SHORT)
1043 break;
1044 }
1045
1046 seen_title = 1;
1047 if (subject) {
1048 int slen = strlen(subject);
1049 memcpy(buf + offset, subject, slen);
1050 offset += slen;
1051 offset += add_rfc2047(buf + offset, line, linelen,
1052 encoding);
1053 }
1054 else {
1055 memset(buf + offset, ' ', indent);
1056 memcpy(buf + offset + indent, line, linelen);
1057 offset += linelen + indent;
1058 }
1059 buf[offset++] = '\n';
1060 if (fmt == CMIT_FMT_ONELINE)
1061 break;
1062 if (subject && plain_non_ascii) {
1063 int sz;
1064 char header[512];
1065 const char *header_fmt =
1066 "Content-Type: text/plain; charset=%s\n"
1067 "Content-Transfer-Encoding: 8bit\n";
1068 sz = snprintf(header, sizeof(header), header_fmt,
1069 encoding);
1070 if (sizeof(header) < sz)
1071 die("Encoding name %s too long", encoding);
1072 memcpy(buf + offset, header, sz);
1073 offset += sz;
1074 }
1075 if (after_subject) {
1076 int slen = strlen(after_subject);
1077 if (slen > space - offset - 1)
1078 slen = space - offset - 1;
1079 memcpy(buf + offset, after_subject, slen);
1080 offset += slen;
1081 after_subject = NULL;
1082 }
1083 subject = NULL;
1084 }
1085 while (offset && isspace(buf[offset-1]))
1086 offset--;
1087 /* Make sure there is an EOLN for the non-oneline case */
1088 if (fmt != CMIT_FMT_ONELINE)
1089 buf[offset++] = '\n';
1090 /*
1091 * make sure there is another EOLN to separate the headers from whatever
1092 * body the caller appends if we haven't already written a body
1093 */
1094 if (fmt == CMIT_FMT_EMAIL && !body)
1095 buf[offset++] = '\n';
1096 buf[offset] = '\0';
1097
1098 free(reencoded);
1099 return offset;
1100 }
1101
1102 struct commit *pop_commit(struct commit_list **stack)
1103 {
1104 struct commit_list *top = *stack;
1105 struct commit *item = top ? top->item : NULL;
1106
1107 if (top) {
1108 *stack = top->next;
1109 free(top);
1110 }
1111 return item;
1112 }
1113
1114 int count_parents(struct commit * commit)
1115 {
1116 int count;
1117 struct commit_list * parents = commit->parents;
1118 for (count = 0; parents; parents = parents->next,count++)
1119 ;
1120 return count;
1121 }
1122
1123 void topo_sort_default_setter(struct commit *c, void *data)
1124 {
1125 c->util = data;
1126 }
1127
1128 void *topo_sort_default_getter(struct commit *c)
1129 {
1130 return c->util;
1131 }
1132
1133 /*
1134 * Performs an in-place topological sort on the list supplied.
1135 */
1136 void sort_in_topological_order(struct commit_list ** list, int lifo)
1137 {
1138 sort_in_topological_order_fn(list, lifo, topo_sort_default_setter,
1139 topo_sort_default_getter);
1140 }
1141
1142 void sort_in_topological_order_fn(struct commit_list ** list, int lifo,
1143 topo_sort_set_fn_t setter,
1144 topo_sort_get_fn_t getter)
1145 {
1146 struct commit_list * next = *list;
1147 struct commit_list * work = NULL, **insert;
1148 struct commit_list ** pptr = list;
1149 struct sort_node * nodes;
1150 struct sort_node * next_nodes;
1151 int count = 0;
1152
1153 /* determine the size of the list */
1154 while (next) {
1155 next = next->next;
1156 count++;
1157 }
1158
1159 if (!count)
1160 return;
1161 /* allocate an array to help sort the list */
1162 nodes = xcalloc(count, sizeof(*nodes));
1163 /* link the list to the array */
1164 next_nodes = nodes;
1165 next=*list;
1166 while (next) {
1167 next_nodes->list_item = next;
1168 setter(next->item, next_nodes);
1169 next_nodes++;
1170 next = next->next;
1171 }
1172 /* update the indegree */
1173 next=*list;
1174 while (next) {
1175 struct commit_list * parents = next->item->parents;
1176 while (parents) {
1177 struct commit * parent=parents->item;
1178 struct sort_node * pn = (struct sort_node *) getter(parent);
1179
1180 if (pn)
1181 pn->indegree++;
1182 parents=parents->next;
1183 }
1184 next=next->next;
1185 }
1186 /*
1187 * find the tips
1188 *
1189 * tips are nodes not reachable from any other node in the list
1190 *
1191 * the tips serve as a starting set for the work queue.
1192 */
1193 next=*list;
1194 insert = &work;
1195 while (next) {
1196 struct sort_node * node = (struct sort_node *) getter(next->item);
1197
1198 if (node->indegree == 0) {
1199 insert = &commit_list_insert(next->item, insert)->next;
1200 }
1201 next=next->next;
1202 }
1203
1204 /* process the list in topological order */
1205 if (!lifo)
1206 sort_by_date(&work);
1207 while (work) {
1208 struct commit * work_item = pop_commit(&work);
1209 struct sort_node * work_node = (struct sort_node *) getter(work_item);
1210 struct commit_list * parents = work_item->parents;
1211
1212 while (parents) {
1213 struct commit * parent=parents->item;
1214 struct sort_node * pn = (struct sort_node *) getter(parent);
1215
1216 if (pn) {
1217 /*
1218 * parents are only enqueued for emission
1219 * when all their children have been emitted thereby
1220 * guaranteeing topological order.
1221 */
1222 pn->indegree--;
1223 if (!pn->indegree) {
1224 if (!lifo)
1225 insert_by_date(parent, &work);
1226 else
1227 commit_list_insert(parent, &work);
1228 }
1229 }
1230 parents=parents->next;
1231 }
1232 /*
1233 * work_item is a commit all of whose children
1234 * have already been emitted. we can emit it now.
1235 */
1236 *pptr = work_node->list_item;
1237 pptr = &(*pptr)->next;
1238 *pptr = NULL;
1239 setter(work_item, NULL);
1240 }
1241 free(nodes);
1242 }
1243
1244 /* merge-base stuff */
1245
1246 /* bits #0..15 in revision.h */
1247 #define PARENT1 (1u<<16)
1248 #define PARENT2 (1u<<17)
1249 #define STALE (1u<<18)
1250 #define RESULT (1u<<19)
1251
1252 static const unsigned all_flags = (PARENT1 | PARENT2 | STALE | RESULT);
1253
1254 static struct commit *interesting(struct commit_list *list)
1255 {
1256 while (list) {
1257 struct commit *commit = list->item;
1258 list = list->next;
1259 if (commit->object.flags & STALE)
1260 continue;
1261 return commit;
1262 }
1263 return NULL;
1264 }
1265
1266 static struct commit_list *merge_bases(struct commit *one, struct commit *two)
1267 {
1268 struct commit_list *list = NULL;
1269 struct commit_list *result = NULL;
1270
1271 if (one == two)
1272 /* We do not mark this even with RESULT so we do not
1273 * have to clean it up.
1274 */
1275 return commit_list_insert(one, &result);
1276
1277 parse_commit(one);
1278 parse_commit(two);
1279
1280 one->object.flags |= PARENT1;
1281 two->object.flags |= PARENT2;
1282 insert_by_date(one, &list);
1283 insert_by_date(two, &list);
1284
1285 while (interesting(list)) {
1286 struct commit *commit;
1287 struct commit_list *parents;
1288 struct commit_list *n;
1289 int flags;
1290
1291 commit = list->item;
1292 n = list->next;
1293 free(list);
1294 list = n;
1295
1296 flags = commit->object.flags & (PARENT1 | PARENT2 | STALE);
1297 if (flags == (PARENT1 | PARENT2)) {
1298 if (!(commit->object.flags & RESULT)) {
1299 commit->object.flags |= RESULT;
1300 insert_by_date(commit, &result);
1301 }
1302 /* Mark parents of a found merge stale */
1303 flags |= STALE;
1304 }
1305 parents = commit->parents;
1306 while (parents) {
1307 struct commit *p = parents->item;
1308 parents = parents->next;
1309 if ((p->object.flags & flags) == flags)
1310 continue;
1311 parse_commit(p);
1312 p->object.flags |= flags;
1313 insert_by_date(p, &list);
1314 }
1315 }
1316
1317 /* Clean up the result to remove stale ones */
1318 free_commit_list(list);
1319 list = result; result = NULL;
1320 while (list) {
1321 struct commit_list *n = list->next;
1322 if (!(list->item->object.flags & STALE))
1323 insert_by_date(list->item, &result);
1324 free(list);
1325 list = n;
1326 }
1327 return result;
1328 }
1329
1330 struct commit_list *get_merge_bases(struct commit *one,
1331 struct commit *two,
1332 int cleanup)
1333 {
1334 struct commit_list *list;
1335 struct commit **rslt;
1336 struct commit_list *result;
1337 int cnt, i, j;
1338
1339 result = merge_bases(one, two);
1340 if (one == two)
1341 return result;
1342 if (!result || !result->next) {
1343 if (cleanup) {
1344 clear_commit_marks(one, all_flags);
1345 clear_commit_marks(two, all_flags);
1346 }
1347 return result;
1348 }
1349
1350 /* There are more than one */
1351 cnt = 0;
1352 list = result;
1353 while (list) {
1354 list = list->next;
1355 cnt++;
1356 }
1357 rslt = xcalloc(cnt, sizeof(*rslt));
1358 for (list = result, i = 0; list; list = list->next)
1359 rslt[i++] = list->item;
1360 free_commit_list(result);
1361
1362 clear_commit_marks(one, all_flags);
1363 clear_commit_marks(two, all_flags);
1364 for (i = 0; i < cnt - 1; i++) {
1365 for (j = i+1; j < cnt; j++) {
1366 if (!rslt[i] || !rslt[j])
1367 continue;
1368 result = merge_bases(rslt[i], rslt[j]);
1369 clear_commit_marks(rslt[i], all_flags);
1370 clear_commit_marks(rslt[j], all_flags);
1371 for (list = result; list; list = list->next) {
1372 if (rslt[i] == list->item)
1373 rslt[i] = NULL;
1374 if (rslt[j] == list->item)
1375 rslt[j] = NULL;
1376 }
1377 }
1378 }
1379
1380 /* Surviving ones in rslt[] are the independent results */
1381 result = NULL;
1382 for (i = 0; i < cnt; i++) {
1383 if (rslt[i])
1384 insert_by_date(rslt[i], &result);
1385 }
1386 free(rslt);
1387 return result;
1388 }
1389
1390 int in_merge_bases(struct commit *commit, struct commit **reference, int num)
1391 {
1392 struct commit_list *bases, *b;
1393 int ret = 0;
1394
1395 if (num == 1)
1396 bases = get_merge_bases(commit, *reference, 1);
1397 else
1398 die("not yet");
1399 for (b = bases; b; b = b->next) {
1400 if (!hashcmp(commit->object.sha1, b->item->object.sha1)) {
1401 ret = 1;
1402 break;
1403 }
1404 }
1405
1406 free_commit_list(bases);
1407 return ret;
1408 }
git with Jakub Narębski modifications