Extend --pretty=oneline to cover the first paragraph,
[git/git.git] / commit.c
CommitLineData
8f1d2e6f 1#include "cache.h"
961784ee 2#include "tag.h"
175785e5 3#include "commit.h"
ed09aef0 4#include "pkt-line.h"
52883fbd 5#include "utf8.h"
e52a5de4 6#include "interpolate.h"
199c45bf
JH
7#include "diff.h"
8#include "revision.h"
175785e5 9
60ab26de
LT
10int save_commit_buffer = 1;
11
ab580ace
JS
12struct sort_node
13{
14 /*
55c3eb43
TS
15 * the number of children of the associated commit
16 * that also occur in the list being sorted.
17 */
ab580ace
JS
18 unsigned int indegree;
19
20 /*
55c3eb43
TS
21 * reference to original list item that we will re-use
22 * on output.
23 */
ab580ace
JS
24 struct commit_list * list_item;
25
26};
27
175785e5
DB
28const char *commit_type = "commit";
29
6cdfd179
EW
30struct 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 },
328b710d 38 { "email", 1, CMIT_FMT_EMAIL },
6cdfd179
EW
39 { "full", 5, CMIT_FMT_FULL },
40 { "fuller", 5, CMIT_FMT_FULLER },
41 { "oneline", 1, CMIT_FMT_ONELINE },
e52a5de4 42 { "format:", 7, CMIT_FMT_USERFORMAT},
6cdfd179
EW
43};
44
e52a5de4
JS
45static char *user_format;
46
9b66ec04
LT
47enum cmit_fmt get_commit_format(const char *arg)
48{
6cdfd179
EW
49 int i;
50
51 if (!arg || !*arg)
9b66ec04 52 return CMIT_FMT_DEFAULT;
6cdfd179
EW
53 if (*arg == '=')
54 arg++;
e52a5de4
JS
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 }
6cdfd179 61 for (i = 0; i < ARRAY_SIZE(cmt_fmts); i++) {
b6936205
EW
62 if (!strncmp(arg, cmt_fmts[i].n, cmt_fmts[i].cmp_len) &&
63 !strncmp(arg, cmt_fmts[i].n, strlen(arg)))
6cdfd179
EW
64 return cmt_fmts[i].v;
65 }
66
67 die("invalid --pretty format: %s", arg);
9b66ec04
LT
68}
69
f76412ed
JH
70static struct commit *check_commit(struct object *obj,
71 const unsigned char *sha1,
72 int quiet)
961784ee 73{
1974632c 74 if (obj->type != OBJ_COMMIT) {
f76412ed
JH
75 if (!quiet)
76 error("Object %s is a %s, not a commit",
885a86ab 77 sha1_to_hex(sha1), typename(obj->type));
961784ee
LT
78 return NULL;
79 }
80 return (struct commit *) obj;
81}
82
f76412ed
JH
83struct commit *lookup_commit_reference_gently(const unsigned char *sha1,
84 int quiet)
961784ee 85{
9534f40b 86 struct object *obj = deref_tag(parse_object(sha1), NULL, 0);
961784ee
LT
87
88 if (!obj)
89 return NULL;
f76412ed
JH
90 return check_commit(obj, sha1, quiet);
91}
92
93struct commit *lookup_commit_reference(const unsigned char *sha1)
94{
95 return lookup_commit_reference_gently(sha1, 0);
961784ee
LT
96}
97
5d6ccf5c 98struct commit *lookup_commit(const unsigned char *sha1)
175785e5
DB
99{
100 struct object *obj = lookup_object(sha1);
100c5f3b
LT
101 if (!obj)
102 return create_object(sha1, OBJ_COMMIT, alloc_commit_node());
d1af002d 103 if (!obj->type)
1974632c 104 obj->type = OBJ_COMMIT;
f76412ed 105 return check_commit(obj, sha1, 0);
175785e5
DB
106}
107
108static 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
5040f17e 126static struct commit_graft **commit_graft;
5da5c8f4
JH
127static int commit_graft_alloc, commit_graft_nr;
128
129static 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];
a89fccd2 137 int cmp = hashcmp(sha1, graft->sha1);
5da5c8f4
JH
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
5040f17e
JH
148int register_commit_graft(struct commit_graft *graft, int ignore_dups)
149{
150 int pos = commit_graft_pos(graft->sha1);
a6080a0a 151
5040f17e
JH
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
177struct 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;
360204c3 185 if (buf[0] == '#' || buf[0] == '\0')
5bc4ce58 186 return NULL;
5040f17e
JH
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
207int read_graft_file(const char *graft_file)
5da5c8f4 208{
5da5c8f4
JH
209 FILE *fp = fopen(graft_file, "r");
210 char buf[1024];
5040f17e
JH
211 if (!fp)
212 return -1;
5da5c8f4
JH
213 while (fgets(buf, sizeof(buf), fp)) {
214 /* The format is just "Commit Parent1 Parent2 ...\n" */
215 int len = strlen(buf);
5040f17e 216 struct commit_graft *graft = read_graft_line(buf, len);
5bc4ce58
JH
217 if (!graft)
218 continue;
5040f17e 219 if (register_commit_graft(graft, 1))
5da5c8f4 220 error("duplicate graft data: %s", buf);
5da5c8f4
JH
221 }
222 fclose(fp);
5040f17e
JH
223 return 0;
224}
225
226static 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);
ed09aef0
JS
235 /* make sure shallows are read */
236 is_repository_shallow();
5040f17e 237 commit_graft_prepared = 1;
5da5c8f4
JH
238}
239
240static struct commit_graft *lookup_commit_graft(const unsigned char *sha1)
241{
242 int pos;
5040f17e 243 prepare_commit_graft();
5da5c8f4
JH
244 pos = commit_graft_pos(sha1);
245 if (pos < 0)
246 return NULL;
247 return commit_graft[pos];
248}
249
ed09aef0
JS
250int 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 {
93822c22
AW
261 if (write_in_full(fd, hex, 40) != 40)
262 break;
263 if (write_in_full(fd, "\n", 1) != 1)
264 break;
ed09aef0
JS
265 }
266 }
267 return count;
268}
269
f53514bc
JS
270int 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
bd2c39f5 283int parse_commit_buffer(struct commit *item, void *buffer, unsigned long size)
175785e5 284{
3b44f15a 285 char *tail = buffer;
f7cc77d7 286 char *bufptr = buffer;
175785e5 287 unsigned char parent[20];
6c88be16 288 struct commit_list **pptr;
5da5c8f4 289 struct commit_graft *graft;
27dedf0c 290 unsigned n_refs = 0;
bd2c39f5 291
175785e5
DB
292 if (item->object.parsed)
293 return 0;
294 item->object.parsed = 1;
3b44f15a
JH
295 tail += size;
296 if (tail <= bufptr + 5 || memcmp(bufptr, "tree ", 5))
f7cc77d7 297 return error("bogus commit object %s", sha1_to_hex(item->object.sha1));
3b44f15a 298 if (tail <= bufptr + 45 || get_sha1_hex(bufptr + 5, parent) < 0)
bd2afde8
JH
299 return error("bad tree pointer in commit %s",
300 sha1_to_hex(item->object.sha1));
175785e5 301 item->tree = lookup_tree(parent);
235ac407 302 if (item->tree)
27dedf0c 303 n_refs++;
175785e5 304 bufptr += 46; /* "tree " + "hex sha1" + "\n" */
6c88be16 305 pptr = &item->parents;
5da5c8f4
JH
306
307 graft = lookup_commit_graft(item->object.sha1);
3b44f15a 308 while (bufptr + 48 < tail && !memcmp(bufptr, "parent ", 7)) {
f7cc77d7
LT
309 struct commit *new_parent;
310
3b44f15a
JH
311 if (tail <= bufptr + 48 ||
312 get_sha1_hex(bufptr + 7, parent) ||
313 bufptr[47] != '\n')
f7cc77d7 314 return error("bad parents in commit %s", sha1_to_hex(item->object.sha1));
5da5c8f4
JH
315 bufptr += 48;
316 if (graft)
317 continue;
f7cc77d7 318 new_parent = lookup_commit(parent);
235ac407 319 if (new_parent) {
6c88be16 320 pptr = &commit_list_insert(new_parent, pptr)->next;
27dedf0c 321 n_refs++;
235ac407 322 }
5da5c8f4
JH
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;
27dedf0c 332 n_refs++;
5da5c8f4 333 }
175785e5
DB
334 }
335 item->date = parse_commit_date(bufptr);
27dedf0c
JH
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
175785e5
DB
348 return 0;
349}
350
bd2c39f5
NP
351int parse_commit(struct commit *item)
352{
21666f1a 353 enum object_type type;
bd2c39f5
NP
354 void *buffer;
355 unsigned long size;
356 int ret;
357
358 if (item->object.parsed)
359 return 0;
21666f1a 360 buffer = read_sha1_file(item->object.sha1, &type, &size);
bd2c39f5
NP
361 if (!buffer)
362 return error("Could not read %s",
363 sha1_to_hex(item->object.sha1));
21666f1a 364 if (type != OBJ_COMMIT) {
bd2c39f5
NP
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);
60ab26de 370 if (save_commit_buffer && !ret) {
3ff1fbbb
LT
371 item->buffer = buffer;
372 return 0;
373 }
bd2c39f5
NP
374 free(buffer);
375 return ret;
376}
377
ac5155ef 378struct commit_list *commit_list_insert(struct commit *item, struct commit_list **list_p)
dd97f850 379{
812666c8 380 struct commit_list *new_list = xmalloc(sizeof(struct commit_list));
dd97f850
DB
381 new_list->item = item;
382 new_list->next = *list_p;
383 *list_p = new_list;
ac5155ef 384 return new_list;
dd97f850
DB
385}
386
175785e5
DB
387void 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}
dd97f850 395
f755494c 396struct commit_list * insert_by_date(struct commit *item, struct commit_list **list)
dd97f850
DB
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 }
f755494c 406 return commit_list_insert(item, pp);
dd97f850
DB
407}
408
a6080a0a 409
dd97f850
DB
410void sort_by_date(struct commit_list **list)
411{
412 struct commit_list *ret = NULL;
413 while (*list) {
f755494c 414 insert_by_date((*list)->item, &ret);
dd97f850
DB
415 *list = (*list)->next;
416 }
417 *list = ret;
418}
419
58e28af6
DB
420struct commit *pop_most_recent_commit(struct commit_list **list,
421 unsigned int mark)
dd97f850
DB
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) {
4056c091 431 struct commit *commit = parents->item;
58e28af6
DB
432 parse_commit(commit);
433 if (!(commit->object.flags & mark)) {
434 commit->object.flags |= mark;
f755494c 435 insert_by_date(commit, list);
4056c091 436 }
dd97f850
DB
437 parents = parents->next;
438 }
439 return ret;
440}
e3bc7a3b 441
f8f9c73c
JH
442void clear_commit_marks(struct commit *commit, unsigned int mark)
443{
444 struct commit_list *parents;
445
f8f9c73c 446 commit->object.flags &= ~mark;
58ecf5c1 447 parents = commit->parents;
f8f9c73c 448 while (parents) {
160b7983 449 struct commit *parent = parents->item;
58ecf5c1
JH
450
451 /* Have we already cleared this? */
452 if (mark & parent->object.flags)
160b7983 453 clear_commit_marks(parent, mark);
f8f9c73c
JH
454 parents = parents->next;
455 }
456}
457
e3bc7a3b
LT
458/*
459 * Generic support for pretty-printing the header
460 */
461static int get_one_line(const char *msg, unsigned long len)
462{
463 int ret = 0;
464
465 while (len--) {
466 char c = *msg++;
684958ae
LT
467 if (!c)
468 break;
e3bc7a3b
LT
469 ret++;
470 if (c == '\n')
471 break;
e3bc7a3b
LT
472 }
473 return ret;
474}
475
f7e68b29
JH
476/* High bit set, or ISO-2022-INT */
477static int non_ascii(int ch)
478{
479 ch = (ch & 0xff);
480 return ((ch & 0x80) || (ch == 0x1b));
481}
482
cdd406e3
JH
483static int is_rfc2047_special(char ch)
484{
f7e68b29 485 return (non_ascii(ch) || (ch == '=') || (ch == '?') || (ch == '_'));
cdd406e3
JH
486}
487
f7e68b29
JH
488static int add_rfc2047(char *buf, const char *line, int len,
489 const char *encoding)
cdd406e3
JH
490{
491 char *bp = buf;
492 int i, needquote;
f7e68b29
JH
493 char q_encoding[128];
494 const char *q_encoding_fmt = "=?%s?q?";
cdd406e3
JH
495
496 for (i = needquote = 0; !needquote && i < len; i++) {
f7e68b29
JH
497 int ch = line[i];
498 if (non_ascii(ch))
cdd406e3
JH
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
f7e68b29
JH
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;
cdd406e3 512 for (i = 0; i < len; i++) {
0da46771 513 unsigned ch = line[i] & 0xFF;
996e2d6e
KH
514 /*
515 * We encode ' ' using '=20' even though rfc2047
516 * allows using '_' for readability. Unfortunately,
517 * many programs do not understand this and just
518 * leave the underscore in place.
519 */
520 if (is_rfc2047_special(ch) || ch == ' ') {
cdd406e3
JH
521 sprintf(bp, "=%02X", ch);
522 bp += 3;
523 }
cdd406e3
JH
524 else
525 *bp++ = ch;
526 }
527 memcpy(bp, "?=", 2);
528 bp += 2;
529 return bp - buf;
530}
531
4234a761
JH
532static unsigned long bound_rfc2047(unsigned long len, const char *encoding)
533{
534 /* upper bound of q encoded string of length 'len' */
535 unsigned long elen = strlen(encoding);
536
537 return len * 3 + elen + 100;
538}
539
3dfb9278 540static int add_user_info(const char *what, enum cmit_fmt fmt, char *buf,
a7b02ccf 541 const char *line, enum date_mode dmode,
f7e68b29 542 const char *encoding)
e3bc7a3b
LT
543{
544 char *date;
5de36bfe 545 int namelen;
e3bc7a3b 546 unsigned long time;
000182ea 547 int tz, ret;
ff56fe1c 548 const char *filler = " ";
e3bc7a3b 549
d87449c5
JH
550 if (fmt == CMIT_FMT_ONELINE)
551 return 0;
e3bc7a3b
LT
552 date = strchr(line, '>');
553 if (!date)
554 return 0;
555 namelen = ++date - line;
556 time = strtoul(date, &date, 10);
557 tz = strtol(date, NULL, 10);
558
3eefc189 559 if (fmt == CMIT_FMT_EMAIL) {
cdd406e3
JH
560 char *name_tail = strchr(line, '<');
561 int display_name_length;
562 if (!name_tail)
563 return 0;
564 while (line < name_tail && isspace(name_tail[-1]))
565 name_tail--;
566 display_name_length = name_tail - line;
3eefc189 567 filler = "";
cdd406e3
JH
568 strcpy(buf, "From: ");
569 ret = strlen(buf);
f7e68b29
JH
570 ret += add_rfc2047(buf + ret, line, display_name_length,
571 encoding);
cdd406e3
JH
572 memcpy(buf + ret, name_tail, namelen - display_name_length);
573 ret += namelen - display_name_length;
574 buf[ret++] = '\n';
575 }
576 else {
577 ret = sprintf(buf, "%s: %.*s%.*s\n", what,
578 (fmt == CMIT_FMT_FULLER) ? 4 : 0,
579 filler, namelen, line);
3eefc189 580 }
ff56fe1c
JH
581 switch (fmt) {
582 case CMIT_FMT_MEDIUM:
3dfb9278 583 ret += sprintf(buf + ret, "Date: %s\n",
a7b02ccf 584 show_date(time, tz, dmode));
ff56fe1c 585 break;
3eefc189 586 case CMIT_FMT_EMAIL:
2a387043
JH
587 ret += sprintf(buf + ret, "Date: %s\n",
588 show_rfc2822_date(time, tz));
3eefc189 589 break;
ff56fe1c 590 case CMIT_FMT_FULLER:
3dfb9278 591 ret += sprintf(buf + ret, "%sDate: %s\n", what,
a7b02ccf 592 show_date(time, tz, dmode));
ff56fe1c
JH
593 break;
594 default:
595 /* notin' */
596 break;
597 }
000182ea
LT
598 return ret;
599}
600
3eefc189 601static int is_empty_line(const char *line, int *len_p)
000182ea 602{
3eefc189 603 int len = *len_p;
000182ea
LT
604 while (len && isspace(line[len-1]))
605 len--;
3eefc189 606 *len_p = len;
000182ea 607 return !len;
e3bc7a3b
LT
608}
609
f2d42275 610static int add_merge_info(enum cmit_fmt fmt, char *buf, const struct commit *commit, int abbrev)
28342a5d 611{
f2d42275
JH
612 struct commit_list *parent = commit->parents;
613 int offset;
d87449c5 614
3eefc189
JH
615 if ((fmt == CMIT_FMT_ONELINE) || (fmt == CMIT_FMT_EMAIL) ||
616 !parent || !parent->next)
f2d42275
JH
617 return 0;
618
619 offset = sprintf(buf, "Merge:");
620
621 while (parent) {
622 struct commit *p = parent->item;
14763e7b
EW
623 const char *hex = NULL;
624 const char *dots;
625 if (abbrev)
626 hex = find_unique_abbrev(p->object.sha1, abbrev);
627 if (!hex)
628 hex = sha1_to_hex(p->object.sha1);
629 dots = (abbrev && strlen(hex) != 40) ? "..." : "";
f2d42275
JH
630 parent = parent->next;
631
6bfb27a0 632 offset += sprintf(buf + offset, " %s%s", hex, dots);
28342a5d 633 }
f2d42275 634 buf[offset++] = '\n';
28342a5d
LT
635 return offset;
636}
637
52883fbd
JH
638static char *get_header(const struct commit *commit, const char *key)
639{
640 int key_len = strlen(key);
641 const char *line = commit->buffer;
642
643 for (;;) {
644 const char *eol = strchr(line, '\n'), *next;
645
646 if (line == eol)
647 return NULL;
648 if (!eol) {
649 eol = line + strlen(line);
650 next = NULL;
651 } else
652 next = eol + 1;
e102d435
AR
653 if (eol - line > key_len &&
654 !strncmp(line, key, key_len) &&
655 line[key_len] == ' ') {
52883fbd
JH
656 int len = eol - line - key_len;
657 char *ret = xmalloc(len);
658 memcpy(ret, line + key_len + 1, len - 1);
659 ret[len - 1] = '\0';
660 return ret;
661 }
662 line = next;
663 }
664}
665
3a55602e 666static char *replace_encoding_header(char *buf, const char *encoding)
53af9816
JH
667{
668 char *encoding_header = strstr(buf, "\nencoding ");
d0e50cb4 669 char *header_end = strstr(buf, "\n\n");
53af9816
JH
670 char *end_of_encoding_header;
671 int encoding_header_pos;
672 int encoding_header_len;
673 int new_len;
674 int need_len;
675 int buflen = strlen(buf) + 1;
676
d0e50cb4
JK
677 if (!header_end)
678 header_end = buf + buflen;
679 if (!encoding_header || encoding_header >= header_end)
680 return buf;
53af9816
JH
681 encoding_header++;
682 end_of_encoding_header = strchr(encoding_header, '\n');
683 if (!end_of_encoding_header)
684 return buf; /* should not happen but be defensive */
685 end_of_encoding_header++;
686
687 encoding_header_len = end_of_encoding_header - encoding_header;
688 encoding_header_pos = encoding_header - buf;
689
690 if (is_encoding_utf8(encoding)) {
691 /* we have re-coded to UTF-8; drop the header */
692 memmove(encoding_header, end_of_encoding_header,
693 buflen - (encoding_header_pos + encoding_header_len));
694 return buf;
695 }
696 new_len = strlen(encoding);
697 need_len = new_len + strlen("encoding \n");
698 if (encoding_header_len < need_len) {
699 buf = xrealloc(buf, buflen + (need_len - encoding_header_len));
700 encoding_header = buf + encoding_header_pos;
701 end_of_encoding_header = encoding_header + encoding_header_len;
702 }
703 memmove(end_of_encoding_header + (need_len - encoding_header_len),
704 end_of_encoding_header,
705 buflen - (encoding_header_pos + encoding_header_len));
706 memcpy(encoding_header + 9, encoding, strlen(encoding));
707 encoding_header[9 + new_len] = '\n';
708 return buf;
709}
710
f7e68b29 711static char *logmsg_reencode(const struct commit *commit,
3a55602e 712 const char *output_encoding)
52883fbd 713{
3a55602e
SP
714 static const char *utf8 = "utf-8";
715 const char *use_encoding;
d2c11a38 716 char *encoding;
52883fbd
JH
717 char *out;
718
f7e68b29 719 if (!*output_encoding)
52883fbd 720 return NULL;
d2c11a38 721 encoding = get_header(commit, "encoding");
3a55602e
SP
722 use_encoding = encoding ? encoding : utf8;
723 if (!strcmp(use_encoding, output_encoding))
567fb65e 724 out = xstrdup(commit->buffer);
e90068a9
JH
725 else
726 out = reencode_string(commit->buffer,
3a55602e 727 output_encoding, use_encoding);
53af9816
JH
728 if (out)
729 out = replace_encoding_header(out, output_encoding);
730
3a55602e 731 free(encoding);
52883fbd
JH
732 return out;
733}
734
e52a5de4
JS
735static void fill_person(struct interp *table, const char *msg, int len)
736{
737 int start, end, tz = 0;
738 unsigned long date;
739 char *ep;
740
741 /* parse name */
742 for (end = 0; end < len && msg[end] != '<'; end++)
743 ; /* do nothing */
744 start = end + 1;
745 while (end > 0 && isspace(msg[end - 1]))
746 end--;
747 table[0].value = xstrndup(msg, end);
748
749 if (start >= len)
750 return;
751
752 /* parse email */
753 for (end = start + 1; end < len && msg[end] != '>'; end++)
754 ; /* do nothing */
755
756 if (end >= len)
757 return;
758
759 table[1].value = xstrndup(msg + start, end - start);
760
761 /* parse date */
762 for (start = end + 1; start < len && isspace(msg[start]); start++)
763 ; /* do nothing */
764 if (start >= len)
765 return;
766 date = strtoul(msg + start, &ep, 10);
767 if (msg + start == ep)
768 return;
769
4621af37 770 table[5].value = xstrndup(msg + start, ep - (msg + start));
e52a5de4
JS
771
772 /* parse tz */
773 for (start = ep - msg + 1; start < len && isspace(msg[start]); start++)
774 ; /* do nothing */
775 if (start + 1 < len) {
776 tz = strtoul(msg + start + 1, NULL, 10);
777 if (msg[start] == '-')
778 tz = -tz;
779 }
780
781 interp_set_entry(table, 2, show_date(date, tz, 0));
782 interp_set_entry(table, 3, show_rfc2822_date(date, tz));
783 interp_set_entry(table, 4, show_date(date, tz, 1));
784}
785
786static long format_commit_message(const struct commit *commit,
80583c0e 787 const char *msg, char **buf_p, unsigned long *space_p)
e52a5de4
JS
788{
789 struct interp table[] = {
790 { "%H" }, /* commit hash */
791 { "%h" }, /* abbreviated commit hash */
792 { "%T" }, /* tree hash */
793 { "%t" }, /* abbreviated tree hash */
794 { "%P" }, /* parent hashes */
795 { "%p" }, /* abbreviated parent hashes */
796 { "%an" }, /* author name */
797 { "%ae" }, /* author email */
798 { "%ad" }, /* author date */
799 { "%aD" }, /* author date, RFC2822 style */
800 { "%ar" }, /* author date, relative */
801 { "%at" }, /* author date, UNIX timestamp */
802 { "%cn" }, /* committer name */
803 { "%ce" }, /* committer email */
804 { "%cd" }, /* committer date */
805 { "%cD" }, /* committer date, RFC2822 style */
806 { "%cr" }, /* committer date, relative */
807 { "%ct" }, /* committer date, UNIX timestamp */
808 { "%e" }, /* encoding */
809 { "%s" }, /* subject */
810 { "%b" }, /* body */
811 { "%Cred" }, /* red */
812 { "%Cgreen" }, /* green */
813 { "%Cblue" }, /* blue */
814 { "%Creset" }, /* reset color */
199c45bf
JH
815 { "%n" }, /* newline */
816 { "%m" }, /* left/right/bottom */
e52a5de4
JS
817 };
818 enum interp_index {
819 IHASH = 0, IHASH_ABBREV,
820 ITREE, ITREE_ABBREV,
821 IPARENTS, IPARENTS_ABBREV,
822 IAUTHOR_NAME, IAUTHOR_EMAIL,
823 IAUTHOR_DATE, IAUTHOR_DATE_RFC2822, IAUTHOR_DATE_RELATIVE,
824 IAUTHOR_TIMESTAMP,
825 ICOMMITTER_NAME, ICOMMITTER_EMAIL,
826 ICOMMITTER_DATE, ICOMMITTER_DATE_RFC2822,
827 ICOMMITTER_DATE_RELATIVE, ICOMMITTER_TIMESTAMP,
828 IENCODING,
829 ISUBJECT,
830 IBODY,
831 IRED, IGREEN, IBLUE, IRESET_COLOR,
199c45bf
JH
832 INEWLINE,
833 ILEFT_RIGHT,
e52a5de4
JS
834 };
835 struct commit_list *p;
836 char parents[1024];
837 int i;
838 enum { HEADER, SUBJECT, BODY } state;
839
199c45bf 840 if (ILEFT_RIGHT + 1 != ARRAY_SIZE(table))
e52a5de4
JS
841 die("invalid interp table!");
842
843 /* these are independent of the commit */
844 interp_set_entry(table, IRED, "\033[31m");
845 interp_set_entry(table, IGREEN, "\033[32m");
846 interp_set_entry(table, IBLUE, "\033[34m");
847 interp_set_entry(table, IRESET_COLOR, "\033[m");
848 interp_set_entry(table, INEWLINE, "\n");
849
850 /* these depend on the commit */
851 if (!commit->object.parsed)
852 parse_object(commit->object.sha1);
853 interp_set_entry(table, IHASH, sha1_to_hex(commit->object.sha1));
854 interp_set_entry(table, IHASH_ABBREV,
855 find_unique_abbrev(commit->object.sha1,
856 DEFAULT_ABBREV));
857 interp_set_entry(table, ITREE, sha1_to_hex(commit->tree->object.sha1));
858 interp_set_entry(table, ITREE_ABBREV,
859 find_unique_abbrev(commit->tree->object.sha1,
860 DEFAULT_ABBREV));
199c45bf
JH
861 interp_set_entry(table, ILEFT_RIGHT,
862 (commit->object.flags & BOUNDARY)
863 ? "-"
864 : (commit->object.flags & SYMMETRIC_LEFT)
865 ? "<"
866 : ">");
542e165c
JH
867
868 parents[1] = 0;
e52a5de4
JS
869 for (i = 0, p = commit->parents;
870 p && i < sizeof(parents) - 1;
871 p = p->next)
542e165c 872 i += snprintf(parents + i, sizeof(parents) - i - 1, " %s",
e52a5de4 873 sha1_to_hex(p->item->object.sha1));
542e165c
JH
874 interp_set_entry(table, IPARENTS, parents + 1);
875
876 parents[1] = 0;
e52a5de4
JS
877 for (i = 0, p = commit->parents;
878 p && i < sizeof(parents) - 1;
879 p = p->next)
542e165c 880 i += snprintf(parents + i, sizeof(parents) - i - 1, " %s",
e52a5de4
JS
881 find_unique_abbrev(p->item->object.sha1,
882 DEFAULT_ABBREV));
542e165c 883 interp_set_entry(table, IPARENTS_ABBREV, parents + 1);
e52a5de4
JS
884
885 for (i = 0, state = HEADER; msg[i] && state < BODY; i++) {
886 int eol;
887 for (eol = i; msg[eol] && msg[eol] != '\n'; eol++)
888 ; /* do nothing */
889
890 if (state == SUBJECT) {
891 table[ISUBJECT].value = xstrndup(msg + i, eol - i);
892 i = eol;
893 }
894 if (i == eol) {
895 state++;
896 /* strip empty lines */
897 while (msg[eol + 1] == '\n')
898 eol++;
899 } else if (!prefixcmp(msg + i, "author "))
900 fill_person(table + IAUTHOR_NAME,
901 msg + i + 7, eol - i - 7);
902 else if (!prefixcmp(msg + i, "committer "))
903 fill_person(table + ICOMMITTER_NAME,
904 msg + i + 10, eol - i - 10);
905 else if (!prefixcmp(msg + i, "encoding "))
6a5ea2d0
JK
906 table[IENCODING].value =
907 xstrndup(msg + i + 9, eol - i - 9);
e52a5de4
JS
908 i = eol;
909 }
910 if (msg[i])
911 table[IBODY].value = xstrdup(msg + i);
912 for (i = 0; i < ARRAY_SIZE(table); i++)
913 if (!table[i].value)
914 interp_set_entry(table, i, "<unknown>");
915
80583c0e
JH
916 do {
917 char *buf = *buf_p;
918 unsigned long space = *space_p;
919
920 space = interpolate(buf, space, user_format,
921 table, ARRAY_SIZE(table));
922 if (!space)
923 break;
924 buf = xrealloc(buf, space);
925 *buf_p = buf;
926 *space_p = space;
927 } while (1);
e52a5de4
JS
928 interp_clear_table(table, ARRAY_SIZE(table));
929
80583c0e 930 return strlen(*buf_p);
e52a5de4
JS
931}
932
4234a761
JH
933static void pp_header(enum cmit_fmt fmt,
934 int abbrev,
935 enum date_mode dmode,
936 const char *encoding,
937 const struct commit *commit,
938 const char **msg_p,
939 unsigned long *len_p,
940 unsigned long *ofs_p,
941 char **buf_p,
942 unsigned long *space_p)
943{
944 int parents_shown = 0;
945
946 for (;;) {
947 const char *line = *msg_p;
948 char *dst;
949 int linelen = get_one_line(*msg_p, *len_p);
950 unsigned long len;
951
952 if (!linelen)
953 return;
954 *msg_p += linelen;
955 *len_p -= linelen;
956
957 if (linelen == 1)
958 /* End of header */
959 return;
960
961 ALLOC_GROW(*buf_p, linelen + *ofs_p + 20, *space_p);
962 dst = *buf_p + *ofs_p;
963
964 if (fmt == CMIT_FMT_RAW) {
965 memcpy(dst, line, linelen);
966 *ofs_p += linelen;
967 continue;
968 }
969
970 if (!memcmp(line, "parent ", 7)) {
971 if (linelen != 48)
972 die("bad parent line in commit");
973 continue;
974 }
975
976 if (!parents_shown) {
977 struct commit_list *parent;
978 int num;
979 for (parent = commit->parents, num = 0;
980 parent;
981 parent = parent->next, num++)
982 ;
983 /* with enough slop */
984 num = *ofs_p + num * 50 + 20;
985 ALLOC_GROW(*buf_p, num, *space_p);
986 dst = *buf_p + *ofs_p;
987 *ofs_p += add_merge_info(fmt, dst, commit, abbrev);
988 parents_shown = 1;
989 }
990
991 /*
992 * MEDIUM == DEFAULT shows only author with dates.
993 * FULL shows both authors but not dates.
994 * FULLER shows both authors and dates.
995 */
996 if (!memcmp(line, "author ", 7)) {
997 len = linelen;
998 if (fmt == CMIT_FMT_EMAIL)
999 len = bound_rfc2047(linelen, encoding);
1000 ALLOC_GROW(*buf_p, *ofs_p + len, *space_p);
1001 dst = *buf_p + *ofs_p;
1002 *ofs_p += add_user_info("Author", fmt, dst,
1003 line + 7, dmode, encoding);
1004 }
1005
1006 if (!memcmp(line, "committer ", 10) &&
1007 (fmt == CMIT_FMT_FULL || fmt == CMIT_FMT_FULLER)) {
1008 len = linelen;
1009 if (fmt == CMIT_FMT_EMAIL)
1010 len = bound_rfc2047(linelen, encoding);
1011 ALLOC_GROW(*buf_p, *ofs_p + len, *space_p);
1012 dst = *buf_p + *ofs_p;
1013 *ofs_p += add_user_info("Commit", fmt, dst,
1014 line + 10, dmode, encoding);
1015 }
1016 }
1017}
1018
1019static void pp_title_line(enum cmit_fmt fmt,
1020 const char **msg_p,
1021 unsigned long *len_p,
1022 unsigned long *ofs_p,
1023 char **buf_p,
1024 unsigned long *space_p,
1025 int indent,
1026 const char *subject,
1027 const char *after_subject,
1028 const char *encoding,
1029 int plain_non_ascii)
1030{
1031 char *title;
1032 unsigned long title_alloc, title_len;
1033 unsigned long len;
1034
1035 title_len = 0;
1036 title_alloc = 80;
1037 title = xmalloc(title_alloc);
1038 for (;;) {
1039 const char *line = *msg_p;
1040 int linelen = get_one_line(line, *len_p);
1041 *msg_p += linelen;
1042 *len_p -= linelen;
1043
1044 if (!linelen || is_empty_line(line, &linelen))
1045 break;
1046
1047 if (title_alloc <= title_len + linelen + 2) {
1048 title_alloc = title_len + linelen + 80;
1049 title = xrealloc(title, title_alloc);
1050 }
1051 len = 0;
1052 if (title_len) {
1053 if (fmt == CMIT_FMT_EMAIL) {
1054 len++;
1055 title[title_len++] = '\n';
1056 }
1057 len++;
1058 title[title_len++] = ' ';
1059 }
1060 memcpy(title + title_len, line, linelen);
1061 title_len += linelen;
1062 }
1063
1064 /* Enough slop for the MIME header and rfc2047 */
1065 len = bound_rfc2047(title_len, encoding)+ 1000;
1066 if (subject)
1067 len += strlen(subject);
1068 if (after_subject)
1069 len += strlen(after_subject);
1070 if (encoding)
1071 len += strlen(encoding);
1072 ALLOC_GROW(*buf_p, title_len + *ofs_p + len, *space_p);
1073
1074 if (subject) {
1075 len = strlen(subject);
1076 memcpy(*buf_p + *ofs_p, subject, len);
1077 *ofs_p += len;
1078 *ofs_p += add_rfc2047(*buf_p + *ofs_p,
1079 title, title_len, encoding);
1080 } else {
1081 memcpy(*buf_p + *ofs_p, title, title_len);
1082 *ofs_p += title_len;
1083 }
1084 (*buf_p)[(*ofs_p)++] = '\n';
1085 if (plain_non_ascii) {
1086 const char *header_fmt =
1087 "MIME-Version: 1.0\n"
1088 "Content-Type: text/plain; charset=%s\n"
1089 "Content-Transfer-Encoding: 8bit\n";
1090 *ofs_p += snprintf(*buf_p + *ofs_p,
1091 *space_p - *ofs_p,
1092 header_fmt, encoding);
1093 }
1094 if (after_subject) {
1095 len = strlen(after_subject);
1096 memcpy(*buf_p + *ofs_p, after_subject, len);
1097 *ofs_p += len;
1098 }
1099 free(title);
1100 if (fmt == CMIT_FMT_EMAIL) {
1101 ALLOC_GROW(*buf_p, *ofs_p + 20, *space_p);
1102 (*buf_p)[(*ofs_p)++] = '\n';
1103 }
1104}
1105
1106static void pp_remainder(enum cmit_fmt fmt,
1107 const char **msg_p,
1108 unsigned long *len_p,
1109 unsigned long *ofs_p,
1110 char **buf_p,
1111 unsigned long *space_p,
1112 int indent)
1113{
1114 int first = 1;
1115 for (;;) {
1116 const char *line = *msg_p;
1117 int linelen = get_one_line(line, *len_p);
1118 *msg_p += linelen;
1119 *len_p -= linelen;
1120
1121 if (!linelen)
1122 break;
1123
1124 if (is_empty_line(line, &linelen)) {
1125 if (first)
1126 continue;
1127 if (fmt == CMIT_FMT_SHORT)
1128 break;
1129 }
1130 first = 0;
1131
1132 ALLOC_GROW(*buf_p, *ofs_p + linelen + indent + 20, *space_p);
1133 if (indent) {
1134 memset(*buf_p + *ofs_p, ' ', indent);
1135 *ofs_p += indent;
1136 }
1137 memcpy(*buf_p + *ofs_p, line, linelen);
1138 *ofs_p += linelen;
1139 (*buf_p)[(*ofs_p)++] = '\n';
1140 }
1141}
1142
52883fbd
JH
1143unsigned long pretty_print_commit(enum cmit_fmt fmt,
1144 const struct commit *commit,
1145 unsigned long len,
80583c0e 1146 char **buf_p, unsigned long *space_p,
3dfb9278 1147 int abbrev, const char *subject,
52883fbd 1148 const char *after_subject,
a7b02ccf 1149 enum date_mode dmode)
e3bc7a3b 1150{
e3bc7a3b 1151 unsigned long offset = 0;
4234a761 1152 unsigned long beginning_of_body;
3eefc189 1153 int indent = 4;
3815f423 1154 const char *msg = commit->buffer;
c831da66 1155 int plain_non_ascii = 0;
f7e68b29 1156 char *reencoded;
3a55602e 1157 const char *encoding;
80583c0e 1158 char *buf;
52883fbd 1159
e52a5de4 1160 if (fmt == CMIT_FMT_USERFORMAT)
80583c0e 1161 return format_commit_message(commit, msg, buf_p, space_p);
e52a5de4 1162
f7e68b29
JH
1163 encoding = (git_log_output_encoding
1164 ? git_log_output_encoding
1165 : git_commit_encoding);
1166 if (!encoding)
1167 encoding = "utf-8";
1168 reencoded = logmsg_reencode(commit, encoding);
4234a761 1169 if (reencoded) {
d2c11a38 1170 msg = reencoded;
4234a761
JH
1171 len = strlen(reencoded);
1172 }
3eefc189 1173
3eefc189
JH
1174 if (fmt == CMIT_FMT_ONELINE || fmt == CMIT_FMT_EMAIL)
1175 indent = 0;
e3bc7a3b 1176
c831da66
JH
1177 /* After-subject is used to pass in Content-Type: multipart
1178 * MIME header; in that case we do not have to do the
1179 * plaintext content type even if the commit message has
1180 * non 7-bit ASCII character. Otherwise, check if we need
1181 * to say this is not a 7-bit ASCII.
1182 */
1183 if (fmt == CMIT_FMT_EMAIL && !after_subject) {
0da46771
JH
1184 int i, ch, in_body;
1185
1186 for (in_body = i = 0; (ch = msg[i]) && i < len; i++) {
1187 if (!in_body) {
1188 /* author could be non 7-bit ASCII but
d2c11a38 1189 * the log may be so; skip over the
0da46771
JH
1190 * header part first.
1191 */
1192 if (ch == '\n' &&
1193 i + 1 < len && msg[i+1] == '\n')
1194 in_body = 1;
1195 }
f7e68b29 1196 else if (non_ascii(ch)) {
c831da66 1197 plain_non_ascii = 1;
0da46771
JH
1198 break;
1199 }
1200 }
c831da66
JH
1201 }
1202
4234a761
JH
1203 pp_header(fmt, abbrev, dmode, encoding,
1204 commit, &msg, &len,
1205 &offset, buf_p, space_p);
1206 if (fmt != CMIT_FMT_ONELINE && !subject) {
1207 ALLOC_GROW(*buf_p, offset + 20, *space_p);
1208 (*buf_p)[offset++] = '\n';
80583c0e
JH
1209 }
1210
4234a761 1211 /* Skip excess blank lines at the beginning of body, if any... */
e3bc7a3b 1212 for (;;) {
e3bc7a3b 1213 int linelen = get_one_line(msg, len);
4234a761 1214 int ll = linelen;
e3bc7a3b
LT
1215 if (!linelen)
1216 break;
4234a761
JH
1217 if (!is_empty_line(msg, &ll))
1218 break;
e3bc7a3b
LT
1219 msg += linelen;
1220 len -= linelen;
4234a761 1221 }
000182ea 1222
4234a761
JH
1223 /* These formats treat the title line specially. */
1224 if (fmt == CMIT_FMT_ONELINE
1225 || fmt == CMIT_FMT_EMAIL)
1226 pp_title_line(fmt, &msg, &len, &offset,
1227 buf_p, space_p, indent,
1228 subject, after_subject, encoding,
1229 plain_non_ascii);
19b3bd3e 1230
4234a761
JH
1231 beginning_of_body = offset;
1232 if (fmt != CMIT_FMT_ONELINE)
1233 pp_remainder(fmt, &msg, &len, &offset,
1234 buf_p, space_p, indent);
d87449c5 1235
4234a761 1236 while (offset && isspace((*buf_p)[offset-1]))
40c2fe00 1237 offset--;
4234a761
JH
1238
1239 ALLOC_GROW(*buf_p, offset + 20, *space_p);
1240 buf = *buf_p;
1241
40c2fe00
LT
1242 /* Make sure there is an EOLN for the non-oneline case */
1243 if (fmt != CMIT_FMT_ONELINE)
1244 buf[offset++] = '\n';
4234a761 1245
19b3bd3e 1246 /*
4234a761
JH
1247 * The caller may append additional body text in e-mail
1248 * format. Make sure we did not strip the blank line
1249 * between the header and the body.
19b3bd3e 1250 */
4234a761 1251 if (fmt == CMIT_FMT_EMAIL && offset <= beginning_of_body)
19b3bd3e 1252 buf[offset++] = '\n';
e3bc7a3b 1253 buf[offset] = '\0';
52883fbd 1254 free(reencoded);
e3bc7a3b
LT
1255 return offset;
1256}
a3437b8c
JS
1257
1258struct commit *pop_commit(struct commit_list **stack)
1259{
1260 struct commit_list *top = *stack;
1261 struct commit *item = top ? top->item : NULL;
1262
1263 if (top) {
1264 *stack = top->next;
1265 free(top);
1266 }
1267 return item;
1268}
1269
6b6dcfc2
FK
1270void topo_sort_default_setter(struct commit *c, void *data)
1271{
d3ff6f55 1272 c->util = data;
6b6dcfc2
FK
1273}
1274
1275void *topo_sort_default_getter(struct commit *c)
1276{
d3ff6f55 1277 return c->util;
6b6dcfc2
FK
1278}
1279
ab580ace
JS
1280/*
1281 * Performs an in-place topological sort on the list supplied.
1282 */
4c8725f1 1283void sort_in_topological_order(struct commit_list ** list, int lifo)
6b6dcfc2
FK
1284{
1285 sort_in_topological_order_fn(list, lifo, topo_sort_default_setter,
1286 topo_sort_default_getter);
1287}
1288
1289void sort_in_topological_order_fn(struct commit_list ** list, int lifo,
1290 topo_sort_set_fn_t setter,
1291 topo_sort_get_fn_t getter)
ab580ace
JS
1292{
1293 struct commit_list * next = *list;
2ed02887 1294 struct commit_list * work = NULL, **insert;
ab580ace
JS
1295 struct commit_list ** pptr = list;
1296 struct sort_node * nodes;
1297 struct sort_node * next_nodes;
1298 int count = 0;
1299
1300 /* determine the size of the list */
1301 while (next) {
1302 next = next->next;
1303 count++;
1304 }
a6080a0a 1305
7d6fb370
EW
1306 if (!count)
1307 return;
ab580ace
JS
1308 /* allocate an array to help sort the list */
1309 nodes = xcalloc(count, sizeof(*nodes));
1310 /* link the list to the array */
1311 next_nodes = nodes;
1312 next=*list;
1313 while (next) {
1314 next_nodes->list_item = next;
6b6dcfc2 1315 setter(next->item, next_nodes);
ab580ace
JS
1316 next_nodes++;
1317 next = next->next;
1318 }
1319 /* update the indegree */
1320 next=*list;
1321 while (next) {
1322 struct commit_list * parents = next->item->parents;
1323 while (parents) {
1324 struct commit * parent=parents->item;
6b6dcfc2
FK
1325 struct sort_node * pn = (struct sort_node *) getter(parent);
1326
ab580ace
JS
1327 if (pn)
1328 pn->indegree++;
1329 parents=parents->next;
1330 }
1331 next=next->next;
1332 }
a6080a0a 1333 /*
ab580ace
JS
1334 * find the tips
1335 *
a6080a0a
JH
1336 * tips are nodes not reachable from any other node in the list
1337 *
ab580ace
JS
1338 * the tips serve as a starting set for the work queue.
1339 */
1340 next=*list;
2ed02887 1341 insert = &work;
ab580ace 1342 while (next) {
6b6dcfc2 1343 struct sort_node * node = (struct sort_node *) getter(next->item);
ab580ace
JS
1344
1345 if (node->indegree == 0) {
2ed02887 1346 insert = &commit_list_insert(next->item, insert)->next;
ab580ace
JS
1347 }
1348 next=next->next;
1349 }
4c8725f1 1350
ab580ace 1351 /* process the list in topological order */
4c8725f1
JH
1352 if (!lifo)
1353 sort_by_date(&work);
ab580ace
JS
1354 while (work) {
1355 struct commit * work_item = pop_commit(&work);
6b6dcfc2 1356 struct sort_node * work_node = (struct sort_node *) getter(work_item);
ab580ace
JS
1357 struct commit_list * parents = work_item->parents;
1358
1359 while (parents) {
1360 struct commit * parent=parents->item;
6b6dcfc2
FK
1361 struct sort_node * pn = (struct sort_node *) getter(parent);
1362
ab580ace 1363 if (pn) {
6b6dcfc2 1364 /*
a6080a0a 1365 * parents are only enqueued for emission
ab580ace
JS
1366 * when all their children have been emitted thereby
1367 * guaranteeing topological order.
1368 */
1369 pn->indegree--;
4c8725f1
JH
1370 if (!pn->indegree) {
1371 if (!lifo)
1372 insert_by_date(parent, &work);
1373 else
1374 commit_list_insert(parent, &work);
1375 }
ab580ace
JS
1376 }
1377 parents=parents->next;
1378 }
1379 /*
1380 * work_item is a commit all of whose children
1381 * have already been emitted. we can emit it now.
1382 */
1383 *pptr = work_node->list_item;
1384 pptr = &(*pptr)->next;
1385 *pptr = NULL;
6b6dcfc2 1386 setter(work_item, NULL);
ab580ace
JS
1387 }
1388 free(nodes);
1389}
7c6f8aaf 1390
1295228d 1391/* merge-base stuff */
7c6f8aaf 1392
577ed5c2
JH
1393/* bits #0..15 in revision.h */
1394#define PARENT1 (1u<<16)
1395#define PARENT2 (1u<<17)
1396#define STALE (1u<<18)
1397#define RESULT (1u<<19)
7c6f8aaf 1398
1295228d
JH
1399static const unsigned all_flags = (PARENT1 | PARENT2 | STALE | RESULT);
1400
7c6f8aaf
JS
1401static struct commit *interesting(struct commit_list *list)
1402{
1403 while (list) {
1404 struct commit *commit = list->item;
1405 list = list->next;
542ccefe 1406 if (commit->object.flags & STALE)
7c6f8aaf
JS
1407 continue;
1408 return commit;
1409 }
1410 return NULL;
1411}
1412
f3249438 1413static struct commit_list *merge_bases(struct commit *one, struct commit *two)
7c6f8aaf
JS
1414{
1415 struct commit_list *list = NULL;
1416 struct commit_list *result = NULL;
7c6f8aaf 1417
f3249438
JH
1418 if (one == two)
1419 /* We do not mark this even with RESULT so we do not
1420 * have to clean it up.
1421 */
1422 return commit_list_insert(one, &result);
7c6f8aaf 1423
f3249438
JH
1424 parse_commit(one);
1425 parse_commit(two);
7c6f8aaf 1426
f3249438
JH
1427 one->object.flags |= PARENT1;
1428 two->object.flags |= PARENT2;
1429 insert_by_date(one, &list);
1430 insert_by_date(two, &list);
7c6f8aaf
JS
1431
1432 while (interesting(list)) {
f3249438 1433 struct commit *commit;
7c6f8aaf 1434 struct commit_list *parents;
f3249438
JH
1435 struct commit_list *n;
1436 int flags;
7c6f8aaf 1437
f3249438
JH
1438 commit = list->item;
1439 n = list->next;
1440 free(list);
1441 list = n;
7c6f8aaf 1442
f3249438
JH
1443 flags = commit->object.flags & (PARENT1 | PARENT2 | STALE);
1444 if (flags == (PARENT1 | PARENT2)) {
1445 if (!(commit->object.flags & RESULT)) {
1446 commit->object.flags |= RESULT;
1447 insert_by_date(commit, &result);
1448 }
542ccefe
JH
1449 /* Mark parents of a found merge stale */
1450 flags |= STALE;
7c6f8aaf
JS
1451 }
1452 parents = commit->parents;
1453 while (parents) {
1454 struct commit *p = parents->item;
1455 parents = parents->next;
1456 if ((p->object.flags & flags) == flags)
1457 continue;
1458 parse_commit(p);
1459 p->object.flags |= flags;
1460 insert_by_date(p, &list);
1461 }
1462 }
1463
f3249438 1464 /* Clean up the result to remove stale ones */
1295228d 1465 free_commit_list(list);
f3249438
JH
1466 list = result; result = NULL;
1467 while (list) {
1468 struct commit_list *n = list->next;
1469 if (!(list->item->object.flags & STALE))
1470 insert_by_date(list->item, &result);
1471 free(list);
1472 list = n;
1473 }
1474 return result;
1475}
7c6f8aaf 1476
f3249438
JH
1477struct commit_list *get_merge_bases(struct commit *one,
1478 struct commit *two,
1479 int cleanup)
1480{
f3249438
JH
1481 struct commit_list *list;
1482 struct commit **rslt;
1483 struct commit_list *result;
1484 int cnt, i, j;
1485
1486 result = merge_bases(one, two);
1487 if (one == two)
1488 return result;
1489 if (!result || !result->next) {
1490 if (cleanup) {
1491 clear_commit_marks(one, all_flags);
1492 clear_commit_marks(two, all_flags);
7c6f8aaf 1493 }
f3249438 1494 return result;
7c6f8aaf
JS
1495 }
1496
f3249438
JH
1497 /* There are more than one */
1498 cnt = 0;
1499 list = result;
1500 while (list) {
1501 list = list->next;
1502 cnt++;
1503 }
1504 rslt = xcalloc(cnt, sizeof(*rslt));
1505 for (list = result, i = 0; list; list = list->next)
1506 rslt[i++] = list->item;
1507 free_commit_list(result);
1508
1509 clear_commit_marks(one, all_flags);
1510 clear_commit_marks(two, all_flags);
1511 for (i = 0; i < cnt - 1; i++) {
1512 for (j = i+1; j < cnt; j++) {
1513 if (!rslt[i] || !rslt[j])
1514 continue;
1515 result = merge_bases(rslt[i], rslt[j]);
1516 clear_commit_marks(rslt[i], all_flags);
1517 clear_commit_marks(rslt[j], all_flags);
1518 for (list = result; list; list = list->next) {
1519 if (rslt[i] == list->item)
1520 rslt[i] = NULL;
1521 if (rslt[j] == list->item)
1522 rslt[j] = NULL;
1523 }
1524 }
58ecf5c1 1525 }
7c6f8aaf 1526
f3249438
JH
1527 /* Surviving ones in rslt[] are the independent results */
1528 result = NULL;
1529 for (i = 0; i < cnt; i++) {
1530 if (rslt[i])
1531 insert_by_date(rslt[i], &result);
1532 }
1533 free(rslt);
7c6f8aaf
JS
1534 return result;
1535}
2ecd2bbc 1536
03840fc3 1537int in_merge_bases(struct commit *commit, struct commit **reference, int num)
2ecd2bbc
JH
1538{
1539 struct commit_list *bases, *b;
1540 int ret = 0;
1541
03840fc3
JH
1542 if (num == 1)
1543 bases = get_merge_bases(commit, *reference, 1);
1544 else
1545 die("not yet");
2ecd2bbc 1546 for (b = bases; b; b = b->next) {
03840fc3 1547 if (!hashcmp(commit->object.sha1, b->item->object.sha1)) {
2ecd2bbc
JH
1548 ret = 1;
1549 break;
1550 }
1551 }
1552
1553 free_commit_list(bases);
1554 return ret;
1555}