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Documentation: A few minor fixes to Git User's Manual
[git/peff.git] / commit.c
blob754d1b8a0b8282fd3d1d6bd8f6ccb21b407504a5
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
8 int save_commit_buffer = 1;
9
10 struct sort_node
11 {
12 /*
13 * the number of children of the associated commit
14 * that also occur in the list being sorted.
15 */
16 unsigned int indegree;
17
18 /*
19 * reference to original list item that we will re-use
20 * on output.
21 */
22 struct commit_list * list_item;
23
24 };
25
26 const char *commit_type = "commit";
27
28 struct cmt_fmt_map {
29 const char *n;
30 size_t cmp_len;
31 enum cmit_fmt v;
32 } cmt_fmts[] = {
33 { "raw", 1, CMIT_FMT_RAW },
34 { "medium", 1, CMIT_FMT_MEDIUM },
35 { "short", 1, CMIT_FMT_SHORT },
36 { "email", 1, CMIT_FMT_EMAIL },
37 { "full", 5, CMIT_FMT_FULL },
38 { "fuller", 5, CMIT_FMT_FULLER },
39 { "oneline", 1, CMIT_FMT_ONELINE },
40 { "format:", 7, CMIT_FMT_USERFORMAT},
41 };
42
43 static char *user_format;
44
45 enum cmit_fmt get_commit_format(const char *arg)
46 {
47 int i;
48
49 if (!arg || !*arg)
50 return CMIT_FMT_DEFAULT;
51 if (*arg == '=')
52 arg++;
53 if (!prefixcmp(arg, "format:")) {
54 if (user_format)
55 free(user_format);
56 user_format = xstrdup(arg + 7);
57 return CMIT_FMT_USERFORMAT;
58 }
59 for (i = 0; i < ARRAY_SIZE(cmt_fmts); i++) {
60 if (!strncmp(arg, cmt_fmts[i].n, cmt_fmts[i].cmp_len) &&
61 !strncmp(arg, cmt_fmts[i].n, strlen(arg)))
62 return cmt_fmts[i].v;
63 }
64
65 die("invalid --pretty format: %s", arg);
66 }
67
68 static struct commit *check_commit(struct object *obj,
69 const unsigned char *sha1,
70 int quiet)
71 {
72 if (obj->type != OBJ_COMMIT) {
73 if (!quiet)
74 error("Object %s is a %s, not a commit",
75 sha1_to_hex(sha1), typename(obj->type));
76 return NULL;
77 }
78 return (struct commit *) obj;
79 }
80
81 struct commit *lookup_commit_reference_gently(const unsigned char *sha1,
82 int quiet)
83 {
84 struct object *obj = deref_tag(parse_object(sha1), NULL, 0);
85
86 if (!obj)
87 return NULL;
88 return check_commit(obj, sha1, quiet);
89 }
90
91 struct commit *lookup_commit_reference(const unsigned char *sha1)
92 {
93 return lookup_commit_reference_gently(sha1, 0);
94 }
95
96 struct commit *lookup_commit(const unsigned char *sha1)
97 {
98 struct object *obj = lookup_object(sha1);
99 if (!obj) {
100 struct commit *ret = alloc_commit_node();
101 created_object(sha1, &ret->object);
102 ret->object.type = OBJ_COMMIT;
103 return ret;
104 }
105 if (!obj->type)
106 obj->type = OBJ_COMMIT;
107 return check_commit(obj, sha1, 0);
108 }
109
110 static unsigned long parse_commit_date(const char *buf)
111 {
112 unsigned long date;
113
114 if (memcmp(buf, "author", 6))
115 return 0;
116 while (*buf++ != '\n')
117 /* nada */;
118 if (memcmp(buf, "committer", 9))
119 return 0;
120 while (*buf++ != '>')
121 /* nada */;
122 date = strtoul(buf, NULL, 10);
123 if (date == ULONG_MAX)
124 date = 0;
125 return date;
126 }
127
128 static struct commit_graft **commit_graft;
129 static int commit_graft_alloc, commit_graft_nr;
130
131 static int commit_graft_pos(const unsigned char *sha1)
132 {
133 int lo, hi;
134 lo = 0;
135 hi = commit_graft_nr;
136 while (lo < hi) {
137 int mi = (lo + hi) / 2;
138 struct commit_graft *graft = commit_graft[mi];
139 int cmp = hashcmp(sha1, graft->sha1);
140 if (!cmp)
141 return mi;
142 if (cmp < 0)
143 hi = mi;
144 else
145 lo = mi + 1;
146 }
147 return -lo - 1;
148 }
149
150 int register_commit_graft(struct commit_graft *graft, int ignore_dups)
151 {
152 int pos = commit_graft_pos(graft->sha1);
153
154 if (0 <= pos) {
155 if (ignore_dups)
156 free(graft);
157 else {
158 free(commit_graft[pos]);
159 commit_graft[pos] = graft;
160 }
161 return 1;
162 }
163 pos = -pos - 1;
164 if (commit_graft_alloc <= ++commit_graft_nr) {
165 commit_graft_alloc = alloc_nr(commit_graft_alloc);
166 commit_graft = xrealloc(commit_graft,
167 sizeof(*commit_graft) *
168 commit_graft_alloc);
169 }
170 if (pos < commit_graft_nr)
171 memmove(commit_graft + pos + 1,
172 commit_graft + pos,
173 (commit_graft_nr - pos - 1) *
174 sizeof(*commit_graft));
175 commit_graft[pos] = graft;
176 return 0;
177 }
178
179 struct commit_graft *read_graft_line(char *buf, int len)
180 {
181 /* The format is just "Commit Parent1 Parent2 ...\n" */
182 int i;
183 struct commit_graft *graft = NULL;
184
185 if (buf[len-1] == '\n')
186 buf[--len] = 0;
187 if (buf[0] == '#' || buf[0] == '\0')
188 return NULL;
189 if ((len + 1) % 41) {
190 bad_graft_data:
191 error("bad graft data: %s", buf);
192 free(graft);
193 return NULL;
194 }
195 i = (len + 1) / 41 - 1;
196 graft = xmalloc(sizeof(*graft) + 20 * i);
197 graft->nr_parent = i;
198 if (get_sha1_hex(buf, graft->sha1))
199 goto bad_graft_data;
200 for (i = 40; i < len; i += 41) {
201 if (buf[i] != ' ')
202 goto bad_graft_data;
203 if (get_sha1_hex(buf + i + 1, graft->parent[i/41]))
204 goto bad_graft_data;
205 }
206 return graft;
207 }
208
209 int read_graft_file(const char *graft_file)
210 {
211 FILE *fp = fopen(graft_file, "r");
212 char buf[1024];
213 if (!fp)
214 return -1;
215 while (fgets(buf, sizeof(buf), fp)) {
216 /* The format is just "Commit Parent1 Parent2 ...\n" */
217 int len = strlen(buf);
218 struct commit_graft *graft = read_graft_line(buf, len);
219 if (!graft)
220 continue;
221 if (register_commit_graft(graft, 1))
222 error("duplicate graft data: %s", buf);
223 }
224 fclose(fp);
225 return 0;
226 }
227
228 static void prepare_commit_graft(void)
229 {
230 static int commit_graft_prepared;
231 char *graft_file;
232
233 if (commit_graft_prepared)
234 return;
235 graft_file = get_graft_file();
236 read_graft_file(graft_file);
237 /* make sure shallows are read */
238 is_repository_shallow();
239 commit_graft_prepared = 1;
240 }
241
242 static struct commit_graft *lookup_commit_graft(const unsigned char *sha1)
243 {
244 int pos;
245 prepare_commit_graft();
246 pos = commit_graft_pos(sha1);
247 if (pos < 0)
248 return NULL;
249 return commit_graft[pos];
250 }
251
252 int write_shallow_commits(int fd, int use_pack_protocol)
253 {
254 int i, count = 0;
255 for (i = 0; i < commit_graft_nr; i++)
256 if (commit_graft[i]->nr_parent < 0) {
257 const char *hex =
258 sha1_to_hex(commit_graft[i]->sha1);
259 count++;
260 if (use_pack_protocol)
261 packet_write(fd, "shallow %s", hex);
262 else {
263 if (write_in_full(fd, hex, 40) != 40)
264 break;
265 if (write_in_full(fd, "\n", 1) != 1)
266 break;
267 }
268 }
269 return count;
270 }
271
272 int unregister_shallow(const unsigned char *sha1)
273 {
274 int pos = commit_graft_pos(sha1);
275 if (pos < 0)
276 return -1;
277 if (pos + 1 < commit_graft_nr)
278 memcpy(commit_graft + pos, commit_graft + pos + 1,
279 sizeof(struct commit_graft *)
280 * (commit_graft_nr - pos - 1));
281 commit_graft_nr--;
282 return 0;
283 }
284
285 int parse_commit_buffer(struct commit *item, void *buffer, unsigned long size)
286 {
287 char *tail = buffer;
288 char *bufptr = buffer;
289 unsigned char parent[20];
290 struct commit_list **pptr;
291 struct commit_graft *graft;
292 unsigned n_refs = 0;
293
294 if (item->object.parsed)
295 return 0;
296 item->object.parsed = 1;
297 tail += size;
298 if (tail <= bufptr + 5 || memcmp(bufptr, "tree ", 5))
299 return error("bogus commit object %s", sha1_to_hex(item->object.sha1));
300 if (tail <= bufptr + 45 || get_sha1_hex(bufptr + 5, parent) < 0)
301 return error("bad tree pointer in commit %s",
302 sha1_to_hex(item->object.sha1));
303 item->tree = lookup_tree(parent);
304 if (item->tree)
305 n_refs++;
306 bufptr += 46; /* "tree " + "hex sha1" + "\n" */
307 pptr = &item->parents;
308
309 graft = lookup_commit_graft(item->object.sha1);
310 while (bufptr + 48 < tail && !memcmp(bufptr, "parent ", 7)) {
311 struct commit *new_parent;
312
313 if (tail <= bufptr + 48 ||
314 get_sha1_hex(bufptr + 7, parent) ||
315 bufptr[47] != '\n')
316 return error("bad parents in commit %s", sha1_to_hex(item->object.sha1));
317 bufptr += 48;
318 if (graft)
319 continue;
320 new_parent = lookup_commit(parent);
321 if (new_parent) {
322 pptr = &commit_list_insert(new_parent, pptr)->next;
323 n_refs++;
324 }
325 }
326 if (graft) {
327 int i;
328 struct commit *new_parent;
329 for (i = 0; i < graft->nr_parent; i++) {
330 new_parent = lookup_commit(graft->parent[i]);
331 if (!new_parent)
332 continue;
333 pptr = &commit_list_insert(new_parent, pptr)->next;
334 n_refs++;
335 }
336 }
337 item->date = parse_commit_date(bufptr);
338
339 if (track_object_refs) {
340 unsigned i = 0;
341 struct commit_list *p;
342 struct object_refs *refs = alloc_object_refs(n_refs);
343 if (item->tree)
344 refs->ref[i++] = &item->tree->object;
345 for (p = item->parents; p; p = p->next)
346 refs->ref[i++] = &p->item->object;
347 set_object_refs(&item->object, refs);
348 }
349
350 return 0;
351 }
352
353 int parse_commit(struct commit *item)
354 {
355 enum object_type type;
356 void *buffer;
357 unsigned long size;
358 int ret;
359
360 if (item->object.parsed)
361 return 0;
362 buffer = read_sha1_file(item->object.sha1, &type, &size);
363 if (!buffer)
364 return error("Could not read %s",
365 sha1_to_hex(item->object.sha1));
366 if (type != OBJ_COMMIT) {
367 free(buffer);
368 return error("Object %s not a commit",
369 sha1_to_hex(item->object.sha1));
370 }
371 ret = parse_commit_buffer(item, buffer, size);
372 if (save_commit_buffer && !ret) {
373 item->buffer = buffer;
374 return 0;
375 }
376 free(buffer);
377 return ret;
378 }
379
380 struct commit_list *commit_list_insert(struct commit *item, struct commit_list **list_p)
381 {
382 struct commit_list *new_list = xmalloc(sizeof(struct commit_list));
383 new_list->item = item;
384 new_list->next = *list_p;
385 *list_p = new_list;
386 return new_list;
387 }
388
389 void free_commit_list(struct commit_list *list)
390 {
391 while (list) {
392 struct commit_list *temp = list;
393 list = temp->next;
394 free(temp);
395 }
396 }
397
398 struct commit_list * insert_by_date(struct commit *item, struct commit_list **list)
399 {
400 struct commit_list **pp = list;
401 struct commit_list *p;
402 while ((p = *pp) != NULL) {
403 if (p->item->date < item->date) {
404 break;
405 }
406 pp = &p->next;
407 }
408 return commit_list_insert(item, pp);
409 }
410
411
412 void sort_by_date(struct commit_list **list)
413 {
414 struct commit_list *ret = NULL;
415 while (*list) {
416 insert_by_date((*list)->item, &ret);
417 *list = (*list)->next;
418 }
419 *list = ret;
420 }
421
422 struct commit *pop_most_recent_commit(struct commit_list **list,
423 unsigned int mark)
424 {
425 struct commit *ret = (*list)->item;
426 struct commit_list *parents = ret->parents;
427 struct commit_list *old = *list;
428
429 *list = (*list)->next;
430 free(old);
431
432 while (parents) {
433 struct commit *commit = parents->item;
434 parse_commit(commit);
435 if (!(commit->object.flags & mark)) {
436 commit->object.flags |= mark;
437 insert_by_date(commit, list);
438 }
439 parents = parents->next;
440 }
441 return ret;
442 }
443
444 void clear_commit_marks(struct commit *commit, unsigned int mark)
445 {
446 struct commit_list *parents;
447
448 commit->object.flags &= ~mark;
449 parents = commit->parents;
450 while (parents) {
451 struct commit *parent = parents->item;
452
453 /* Have we already cleared this? */
454 if (mark & parent->object.flags)
455 clear_commit_marks(parent, mark);
456 parents = parents->next;
457 }
458 }
459
460 /*
461 * Generic support for pretty-printing the header
462 */
463 static int get_one_line(const char *msg, unsigned long len)
464 {
465 int ret = 0;
466
467 while (len--) {
468 char c = *msg++;
469 if (!c)
470 break;
471 ret++;
472 if (c == '\n')
473 break;
474 }
475 return ret;
476 }
477
478 /* High bit set, or ISO-2022-INT */
479 static int non_ascii(int ch)
480 {
481 ch = (ch & 0xff);
482 return ((ch & 0x80) || (ch == 0x1b));
483 }
484
485 static int is_rfc2047_special(char ch)
486 {
487 return (non_ascii(ch) || (ch == '=') || (ch == '?') || (ch == '_'));
488 }
489
490 static int add_rfc2047(char *buf, const char *line, int len,
491 const char *encoding)
492 {
493 char *bp = buf;
494 int i, needquote;
495 char q_encoding[128];
496 const char *q_encoding_fmt = "=?%s?q?";
497
498 for (i = needquote = 0; !needquote && i < len; i++) {
499 int ch = line[i];
500 if (non_ascii(ch))
501 needquote++;
502 if ((i + 1 < len) &&
503 (ch == '=' && line[i+1] == '?'))
504 needquote++;
505 }
506 if (!needquote)
507 return sprintf(buf, "%.*s", len, line);
508
509 i = snprintf(q_encoding, sizeof(q_encoding), q_encoding_fmt, encoding);
510 if (sizeof(q_encoding) < i)
511 die("Insanely long encoding name %s", encoding);
512 memcpy(bp, q_encoding, i);
513 bp += i;
514 for (i = 0; i < len; i++) {
515 unsigned ch = line[i] & 0xFF;
516 if (is_rfc2047_special(ch)) {
517 sprintf(bp, "=%02X", ch);
518 bp += 3;
519 }
520 else if (ch == ' ')
521 *bp++ = '_';
522 else
523 *bp++ = ch;
524 }
525 memcpy(bp, "?=", 2);
526 bp += 2;
527 return bp - buf;
528 }
529
530 static int add_user_info(const char *what, enum cmit_fmt fmt, char *buf,
531 const char *line, int relative_date,
532 const char *encoding)
533 {
534 char *date;
535 int namelen;
536 unsigned long time;
537 int tz, ret;
538 const char *filler = " ";
539
540 if (fmt == CMIT_FMT_ONELINE)
541 return 0;
542 date = strchr(line, '>');
543 if (!date)
544 return 0;
545 namelen = ++date - line;
546 time = strtoul(date, &date, 10);
547 tz = strtol(date, NULL, 10);
548
549 if (fmt == CMIT_FMT_EMAIL) {
550 char *name_tail = strchr(line, '<');
551 int display_name_length;
552 if (!name_tail)
553 return 0;
554 while (line < name_tail && isspace(name_tail[-1]))
555 name_tail--;
556 display_name_length = name_tail - line;
557 filler = "";
558 strcpy(buf, "From: ");
559 ret = strlen(buf);
560 ret += add_rfc2047(buf + ret, line, display_name_length,
561 encoding);
562 memcpy(buf + ret, name_tail, namelen - display_name_length);
563 ret += namelen - display_name_length;
564 buf[ret++] = '\n';
565 }
566 else {
567 ret = sprintf(buf, "%s: %.*s%.*s\n", what,
568 (fmt == CMIT_FMT_FULLER) ? 4 : 0,
569 filler, namelen, line);
570 }
571 switch (fmt) {
572 case CMIT_FMT_MEDIUM:
573 ret += sprintf(buf + ret, "Date: %s\n",
574 show_date(time, tz, relative_date));
575 break;
576 case CMIT_FMT_EMAIL:
577 ret += sprintf(buf + ret, "Date: %s\n",
578 show_rfc2822_date(time, tz));
579 break;
580 case CMIT_FMT_FULLER:
581 ret += sprintf(buf + ret, "%sDate: %s\n", what,
582 show_date(time, tz, relative_date));
583 break;
584 default:
585 /* notin' */
586 break;
587 }
588 return ret;
589 }
590
591 static int is_empty_line(const char *line, int *len_p)
592 {
593 int len = *len_p;
594 while (len && isspace(line[len-1]))
595 len--;
596 *len_p = len;
597 return !len;
598 }
599
600 static int add_merge_info(enum cmit_fmt fmt, char *buf, const struct commit *commit, int abbrev)
601 {
602 struct commit_list *parent = commit->parents;
603 int offset;
604
605 if ((fmt == CMIT_FMT_ONELINE) || (fmt == CMIT_FMT_EMAIL) ||
606 !parent || !parent->next)
607 return 0;
608
609 offset = sprintf(buf, "Merge:");
610
611 while (parent) {
612 struct commit *p = parent->item;
613 const char *hex = NULL;
614 const char *dots;
615 if (abbrev)
616 hex = find_unique_abbrev(p->object.sha1, abbrev);
617 if (!hex)
618 hex = sha1_to_hex(p->object.sha1);
619 dots = (abbrev && strlen(hex) != 40) ? "..." : "";
620 parent = parent->next;
621
622 offset += sprintf(buf + offset, " %s%s", hex, dots);
623 }
624 buf[offset++] = '\n';
625 return offset;
626 }
627
628 static char *get_header(const struct commit *commit, const char *key)
629 {
630 int key_len = strlen(key);
631 const char *line = commit->buffer;
632
633 for (;;) {
634 const char *eol = strchr(line, '\n'), *next;
635
636 if (line == eol)
637 return NULL;
638 if (!eol) {
639 eol = line + strlen(line);
640 next = NULL;
641 } else
642 next = eol + 1;
643 if (!strncmp(line, key, key_len) && 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 char *xstrndup(const char *text, int len)
724 {
725 char *result = xmalloc(len + 1);
726 memcpy(result, text, len);
727 result[len] = '\0';
728 return result;
729 }
730
731 static void fill_person(struct interp *table, const char *msg, int len)
732 {
733 int start, end, tz = 0;
734 unsigned long date;
735 char *ep;
736
737 /* parse name */
738 for (end = 0; end < len && msg[end] != '<'; end++)
739 ; /* do nothing */
740 start = end + 1;
741 while (end > 0 && isspace(msg[end - 1]))
742 end--;
743 table[0].value = xstrndup(msg, end);
744
745 if (start >= len)
746 return;
747
748 /* parse email */
749 for (end = start + 1; end < len && msg[end] != '>'; end++)
750 ; /* do nothing */
751
752 if (end >= len)
753 return;
754
755 table[1].value = xstrndup(msg + start, end - start);
756
757 /* parse date */
758 for (start = end + 1; start < len && isspace(msg[start]); start++)
759 ; /* do nothing */
760 if (start >= len)
761 return;
762 date = strtoul(msg + start, &ep, 10);
763 if (msg + start == ep)
764 return;
765
766 table[5].value = xstrndup(msg + start, ep - (msg + start));
767
768 /* parse tz */
769 for (start = ep - msg + 1; start < len && isspace(msg[start]); start++)
770 ; /* do nothing */
771 if (start + 1 < len) {
772 tz = strtoul(msg + start + 1, NULL, 10);
773 if (msg[start] == '-')
774 tz = -tz;
775 }
776
777 interp_set_entry(table, 2, show_date(date, tz, 0));
778 interp_set_entry(table, 3, show_rfc2822_date(date, tz));
779 interp_set_entry(table, 4, show_date(date, tz, 1));
780 }
781
782 static long format_commit_message(const struct commit *commit,
783 const char *msg, char *buf, unsigned long space)
784 {
785 struct interp table[] = {
786 { "%H" }, /* commit hash */
787 { "%h" }, /* abbreviated commit hash */
788 { "%T" }, /* tree hash */
789 { "%t" }, /* abbreviated tree hash */
790 { "%P" }, /* parent hashes */
791 { "%p" }, /* abbreviated parent hashes */
792 { "%an" }, /* author name */
793 { "%ae" }, /* author email */
794 { "%ad" }, /* author date */
795 { "%aD" }, /* author date, RFC2822 style */
796 { "%ar" }, /* author date, relative */
797 { "%at" }, /* author date, UNIX timestamp */
798 { "%cn" }, /* committer name */
799 { "%ce" }, /* committer email */
800 { "%cd" }, /* committer date */
801 { "%cD" }, /* committer date, RFC2822 style */
802 { "%cr" }, /* committer date, relative */
803 { "%ct" }, /* committer date, UNIX timestamp */
804 { "%e" }, /* encoding */
805 { "%s" }, /* subject */
806 { "%b" }, /* body */
807 { "%Cred" }, /* red */
808 { "%Cgreen" }, /* green */
809 { "%Cblue" }, /* blue */
810 { "%Creset" }, /* reset color */
811 { "%n" } /* newline */
812 };
813 enum interp_index {
814 IHASH = 0, IHASH_ABBREV,
815 ITREE, ITREE_ABBREV,
816 IPARENTS, IPARENTS_ABBREV,
817 IAUTHOR_NAME, IAUTHOR_EMAIL,
818 IAUTHOR_DATE, IAUTHOR_DATE_RFC2822, IAUTHOR_DATE_RELATIVE,
819 IAUTHOR_TIMESTAMP,
820 ICOMMITTER_NAME, ICOMMITTER_EMAIL,
821 ICOMMITTER_DATE, ICOMMITTER_DATE_RFC2822,
822 ICOMMITTER_DATE_RELATIVE, ICOMMITTER_TIMESTAMP,
823 IENCODING,
824 ISUBJECT,
825 IBODY,
826 IRED, IGREEN, IBLUE, IRESET_COLOR,
827 INEWLINE
828 };
829 struct commit_list *p;
830 char parents[1024];
831 int i;
832 enum { HEADER, SUBJECT, BODY } state;
833
834 if (INEWLINE + 1 != ARRAY_SIZE(table))
835 die("invalid interp table!");
836
837 /* these are independent of the commit */
838 interp_set_entry(table, IRED, "\033[31m");
839 interp_set_entry(table, IGREEN, "\033[32m");
840 interp_set_entry(table, IBLUE, "\033[34m");
841 interp_set_entry(table, IRESET_COLOR, "\033[m");
842 interp_set_entry(table, INEWLINE, "\n");
843
844 /* these depend on the commit */
845 if (!commit->object.parsed)
846 parse_object(commit->object.sha1);
847 interp_set_entry(table, IHASH, sha1_to_hex(commit->object.sha1));
848 interp_set_entry(table, IHASH_ABBREV,
849 find_unique_abbrev(commit->object.sha1,
850 DEFAULT_ABBREV));
851 interp_set_entry(table, ITREE, sha1_to_hex(commit->tree->object.sha1));
852 interp_set_entry(table, ITREE_ABBREV,
853 find_unique_abbrev(commit->tree->object.sha1,
854 DEFAULT_ABBREV));
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 int relative_date)
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 relative_date,
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 relative_date,
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 }
peff's git enhancements