Make show_rfc2822_date() just another date output format.
[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
4175e9e3 30static struct cmt_fmt_map {
6cdfd179
EW
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 587 ret += sprintf(buf + ret, "Date: %s\n",
73013afd 588 show_date(time, tz, DATE_RFC2822));
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
73013afd
JH
781 interp_set_entry(table, 2, show_date(date, tz, DATE_NORMAL));
782 interp_set_entry(table, 3, show_date(date, tz, DATE_RFC2822));
783 interp_set_entry(table, 4, show_date(date, tz, DATE_RELATIVE));
ee8f838e 784 interp_set_entry(table, 6, show_date(date, tz, DATE_ISO8601));
e52a5de4
JS
785}
786
787static long format_commit_message(const struct commit *commit,
80583c0e 788 const char *msg, char **buf_p, unsigned long *space_p)
e52a5de4
JS
789{
790 struct interp table[] = {
791 { "%H" }, /* commit hash */
792 { "%h" }, /* abbreviated commit hash */
793 { "%T" }, /* tree hash */
794 { "%t" }, /* abbreviated tree hash */
795 { "%P" }, /* parent hashes */
796 { "%p" }, /* abbreviated parent hashes */
797 { "%an" }, /* author name */
798 { "%ae" }, /* author email */
799 { "%ad" }, /* author date */
800 { "%aD" }, /* author date, RFC2822 style */
801 { "%ar" }, /* author date, relative */
802 { "%at" }, /* author date, UNIX timestamp */
ee8f838e 803 { "%ai" }, /* author date, ISO 8601 */
e52a5de4
JS
804 { "%cn" }, /* committer name */
805 { "%ce" }, /* committer email */
806 { "%cd" }, /* committer date */
807 { "%cD" }, /* committer date, RFC2822 style */
808 { "%cr" }, /* committer date, relative */
809 { "%ct" }, /* committer date, UNIX timestamp */
ee8f838e 810 { "%ci" }, /* committer date, ISO 8601 */
e52a5de4
JS
811 { "%e" }, /* encoding */
812 { "%s" }, /* subject */
813 { "%b" }, /* body */
814 { "%Cred" }, /* red */
815 { "%Cgreen" }, /* green */
816 { "%Cblue" }, /* blue */
817 { "%Creset" }, /* reset color */
199c45bf
JH
818 { "%n" }, /* newline */
819 { "%m" }, /* left/right/bottom */
e52a5de4
JS
820 };
821 enum interp_index {
822 IHASH = 0, IHASH_ABBREV,
823 ITREE, ITREE_ABBREV,
824 IPARENTS, IPARENTS_ABBREV,
825 IAUTHOR_NAME, IAUTHOR_EMAIL,
826 IAUTHOR_DATE, IAUTHOR_DATE_RFC2822, IAUTHOR_DATE_RELATIVE,
ee8f838e 827 IAUTHOR_TIMESTAMP, IAUTHOR_ISO8601,
e52a5de4
JS
828 ICOMMITTER_NAME, ICOMMITTER_EMAIL,
829 ICOMMITTER_DATE, ICOMMITTER_DATE_RFC2822,
830 ICOMMITTER_DATE_RELATIVE, ICOMMITTER_TIMESTAMP,
ee8f838e 831 ICOMMITTER_ISO8601,
e52a5de4
JS
832 IENCODING,
833 ISUBJECT,
834 IBODY,
835 IRED, IGREEN, IBLUE, IRESET_COLOR,
199c45bf
JH
836 INEWLINE,
837 ILEFT_RIGHT,
e52a5de4
JS
838 };
839 struct commit_list *p;
840 char parents[1024];
841 int i;
842 enum { HEADER, SUBJECT, BODY } state;
843
199c45bf 844 if (ILEFT_RIGHT + 1 != ARRAY_SIZE(table))
e52a5de4
JS
845 die("invalid interp table!");
846
847 /* these are independent of the commit */
848 interp_set_entry(table, IRED, "\033[31m");
849 interp_set_entry(table, IGREEN, "\033[32m");
850 interp_set_entry(table, IBLUE, "\033[34m");
851 interp_set_entry(table, IRESET_COLOR, "\033[m");
852 interp_set_entry(table, INEWLINE, "\n");
853
854 /* these depend on the commit */
855 if (!commit->object.parsed)
856 parse_object(commit->object.sha1);
857 interp_set_entry(table, IHASH, sha1_to_hex(commit->object.sha1));
858 interp_set_entry(table, IHASH_ABBREV,
859 find_unique_abbrev(commit->object.sha1,
860 DEFAULT_ABBREV));
861 interp_set_entry(table, ITREE, sha1_to_hex(commit->tree->object.sha1));
862 interp_set_entry(table, ITREE_ABBREV,
863 find_unique_abbrev(commit->tree->object.sha1,
864 DEFAULT_ABBREV));
199c45bf
JH
865 interp_set_entry(table, ILEFT_RIGHT,
866 (commit->object.flags & BOUNDARY)
867 ? "-"
868 : (commit->object.flags & SYMMETRIC_LEFT)
869 ? "<"
870 : ">");
542e165c
JH
871
872 parents[1] = 0;
e52a5de4
JS
873 for (i = 0, p = commit->parents;
874 p && i < sizeof(parents) - 1;
875 p = p->next)
542e165c 876 i += snprintf(parents + i, sizeof(parents) - i - 1, " %s",
e52a5de4 877 sha1_to_hex(p->item->object.sha1));
542e165c
JH
878 interp_set_entry(table, IPARENTS, parents + 1);
879
880 parents[1] = 0;
e52a5de4
JS
881 for (i = 0, p = commit->parents;
882 p && i < sizeof(parents) - 1;
883 p = p->next)
542e165c 884 i += snprintf(parents + i, sizeof(parents) - i - 1, " %s",
e52a5de4
JS
885 find_unique_abbrev(p->item->object.sha1,
886 DEFAULT_ABBREV));
542e165c 887 interp_set_entry(table, IPARENTS_ABBREV, parents + 1);
e52a5de4
JS
888
889 for (i = 0, state = HEADER; msg[i] && state < BODY; i++) {
890 int eol;
891 for (eol = i; msg[eol] && msg[eol] != '\n'; eol++)
892 ; /* do nothing */
893
894 if (state == SUBJECT) {
895 table[ISUBJECT].value = xstrndup(msg + i, eol - i);
896 i = eol;
897 }
898 if (i == eol) {
899 state++;
900 /* strip empty lines */
901 while (msg[eol + 1] == '\n')
902 eol++;
903 } else if (!prefixcmp(msg + i, "author "))
904 fill_person(table + IAUTHOR_NAME,
905 msg + i + 7, eol - i - 7);
906 else if (!prefixcmp(msg + i, "committer "))
907 fill_person(table + ICOMMITTER_NAME,
908 msg + i + 10, eol - i - 10);
909 else if (!prefixcmp(msg + i, "encoding "))
6a5ea2d0
JK
910 table[IENCODING].value =
911 xstrndup(msg + i + 9, eol - i - 9);
e52a5de4
JS
912 i = eol;
913 }
914 if (msg[i])
915 table[IBODY].value = xstrdup(msg + i);
916 for (i = 0; i < ARRAY_SIZE(table); i++)
917 if (!table[i].value)
918 interp_set_entry(table, i, "<unknown>");
919
80583c0e
JH
920 do {
921 char *buf = *buf_p;
922 unsigned long space = *space_p;
923
924 space = interpolate(buf, space, user_format,
925 table, ARRAY_SIZE(table));
926 if (!space)
927 break;
928 buf = xrealloc(buf, space);
929 *buf_p = buf;
930 *space_p = space;
931 } while (1);
e52a5de4
JS
932 interp_clear_table(table, ARRAY_SIZE(table));
933
80583c0e 934 return strlen(*buf_p);
e52a5de4
JS
935}
936
4234a761
JH
937static void pp_header(enum cmit_fmt fmt,
938 int abbrev,
939 enum date_mode dmode,
940 const char *encoding,
941 const struct commit *commit,
942 const char **msg_p,
943 unsigned long *len_p,
944 unsigned long *ofs_p,
945 char **buf_p,
946 unsigned long *space_p)
947{
948 int parents_shown = 0;
949
950 for (;;) {
951 const char *line = *msg_p;
952 char *dst;
953 int linelen = get_one_line(*msg_p, *len_p);
954 unsigned long len;
955
956 if (!linelen)
957 return;
958 *msg_p += linelen;
959 *len_p -= linelen;
960
961 if (linelen == 1)
962 /* End of header */
963 return;
964
965 ALLOC_GROW(*buf_p, linelen + *ofs_p + 20, *space_p);
966 dst = *buf_p + *ofs_p;
967
968 if (fmt == CMIT_FMT_RAW) {
969 memcpy(dst, line, linelen);
970 *ofs_p += linelen;
971 continue;
972 }
973
974 if (!memcmp(line, "parent ", 7)) {
975 if (linelen != 48)
976 die("bad parent line in commit");
977 continue;
978 }
979
980 if (!parents_shown) {
981 struct commit_list *parent;
982 int num;
983 for (parent = commit->parents, num = 0;
984 parent;
985 parent = parent->next, num++)
986 ;
987 /* with enough slop */
988 num = *ofs_p + num * 50 + 20;
989 ALLOC_GROW(*buf_p, num, *space_p);
990 dst = *buf_p + *ofs_p;
991 *ofs_p += add_merge_info(fmt, dst, commit, abbrev);
992 parents_shown = 1;
993 }
994
995 /*
996 * MEDIUM == DEFAULT shows only author with dates.
997 * FULL shows both authors but not dates.
998 * FULLER shows both authors and dates.
999 */
1000 if (!memcmp(line, "author ", 7)) {
1001 len = linelen;
1002 if (fmt == CMIT_FMT_EMAIL)
1003 len = bound_rfc2047(linelen, encoding);
4cd008a9 1004 ALLOC_GROW(*buf_p, *ofs_p + len + 80, *space_p);
4234a761
JH
1005 dst = *buf_p + *ofs_p;
1006 *ofs_p += add_user_info("Author", fmt, dst,
1007 line + 7, dmode, encoding);
1008 }
1009
1010 if (!memcmp(line, "committer ", 10) &&
1011 (fmt == CMIT_FMT_FULL || fmt == CMIT_FMT_FULLER)) {
1012 len = linelen;
1013 if (fmt == CMIT_FMT_EMAIL)
1014 len = bound_rfc2047(linelen, encoding);
4cd008a9 1015 ALLOC_GROW(*buf_p, *ofs_p + len + 80, *space_p);
4234a761
JH
1016 dst = *buf_p + *ofs_p;
1017 *ofs_p += add_user_info("Commit", fmt, dst,
1018 line + 10, dmode, encoding);
1019 }
1020 }
1021}
1022
1023static void pp_title_line(enum cmit_fmt fmt,
1024 const char **msg_p,
1025 unsigned long *len_p,
1026 unsigned long *ofs_p,
1027 char **buf_p,
1028 unsigned long *space_p,
1029 int indent,
1030 const char *subject,
1031 const char *after_subject,
1032 const char *encoding,
1033 int plain_non_ascii)
1034{
1035 char *title;
1036 unsigned long title_alloc, title_len;
1037 unsigned long len;
1038
1039 title_len = 0;
1040 title_alloc = 80;
1041 title = xmalloc(title_alloc);
1042 for (;;) {
1043 const char *line = *msg_p;
1044 int linelen = get_one_line(line, *len_p);
1045 *msg_p += linelen;
1046 *len_p -= linelen;
1047
1048 if (!linelen || is_empty_line(line, &linelen))
1049 break;
1050
1051 if (title_alloc <= title_len + linelen + 2) {
1052 title_alloc = title_len + linelen + 80;
1053 title = xrealloc(title, title_alloc);
1054 }
1055 len = 0;
1056 if (title_len) {
1057 if (fmt == CMIT_FMT_EMAIL) {
1058 len++;
1059 title[title_len++] = '\n';
1060 }
1061 len++;
1062 title[title_len++] = ' ';
1063 }
1064 memcpy(title + title_len, line, linelen);
1065 title_len += linelen;
1066 }
1067
1068 /* Enough slop for the MIME header and rfc2047 */
1069 len = bound_rfc2047(title_len, encoding)+ 1000;
1070 if (subject)
1071 len += strlen(subject);
1072 if (after_subject)
1073 len += strlen(after_subject);
1074 if (encoding)
1075 len += strlen(encoding);
1076 ALLOC_GROW(*buf_p, title_len + *ofs_p + len, *space_p);
1077
1078 if (subject) {
1079 len = strlen(subject);
1080 memcpy(*buf_p + *ofs_p, subject, len);
1081 *ofs_p += len;
1082 *ofs_p += add_rfc2047(*buf_p + *ofs_p,
1083 title, title_len, encoding);
1084 } else {
1085 memcpy(*buf_p + *ofs_p, title, title_len);
1086 *ofs_p += title_len;
1087 }
1088 (*buf_p)[(*ofs_p)++] = '\n';
1089 if (plain_non_ascii) {
1090 const char *header_fmt =
1091 "MIME-Version: 1.0\n"
1092 "Content-Type: text/plain; charset=%s\n"
1093 "Content-Transfer-Encoding: 8bit\n";
1094 *ofs_p += snprintf(*buf_p + *ofs_p,
1095 *space_p - *ofs_p,
1096 header_fmt, encoding);
1097 }
1098 if (after_subject) {
1099 len = strlen(after_subject);
1100 memcpy(*buf_p + *ofs_p, after_subject, len);
1101 *ofs_p += len;
1102 }
1103 free(title);
1104 if (fmt == CMIT_FMT_EMAIL) {
1105 ALLOC_GROW(*buf_p, *ofs_p + 20, *space_p);
1106 (*buf_p)[(*ofs_p)++] = '\n';
1107 }
1108}
1109
1110static void pp_remainder(enum cmit_fmt fmt,
1111 const char **msg_p,
1112 unsigned long *len_p,
1113 unsigned long *ofs_p,
1114 char **buf_p,
1115 unsigned long *space_p,
1116 int indent)
1117{
1118 int first = 1;
1119 for (;;) {
1120 const char *line = *msg_p;
1121 int linelen = get_one_line(line, *len_p);
1122 *msg_p += linelen;
1123 *len_p -= linelen;
1124
1125 if (!linelen)
1126 break;
1127
1128 if (is_empty_line(line, &linelen)) {
1129 if (first)
1130 continue;
1131 if (fmt == CMIT_FMT_SHORT)
1132 break;
1133 }
1134 first = 0;
1135
1136 ALLOC_GROW(*buf_p, *ofs_p + linelen + indent + 20, *space_p);
1137 if (indent) {
1138 memset(*buf_p + *ofs_p, ' ', indent);
1139 *ofs_p += indent;
1140 }
1141 memcpy(*buf_p + *ofs_p, line, linelen);
1142 *ofs_p += linelen;
1143 (*buf_p)[(*ofs_p)++] = '\n';
1144 }
e52a5de4
JS
1145}
1146
52883fbd
JH
1147unsigned long pretty_print_commit(enum cmit_fmt fmt,
1148 const struct commit *commit,
1149 unsigned long len,
80583c0e 1150 char **buf_p, unsigned long *space_p,
3dfb9278 1151 int abbrev, const char *subject,
52883fbd 1152 const char *after_subject,
a7b02ccf 1153 enum date_mode dmode)
e3bc7a3b 1154{
e3bc7a3b 1155 unsigned long offset = 0;
4234a761 1156 unsigned long beginning_of_body;
3eefc189 1157 int indent = 4;
3815f423 1158 const char *msg = commit->buffer;
c831da66 1159 int plain_non_ascii = 0;
f7e68b29 1160 char *reencoded;
3a55602e 1161 const char *encoding;
80583c0e 1162 char *buf;
52883fbd 1163
e52a5de4 1164 if (fmt == CMIT_FMT_USERFORMAT)
80583c0e 1165 return format_commit_message(commit, msg, buf_p, space_p);
e52a5de4 1166
f7e68b29
JH
1167 encoding = (git_log_output_encoding
1168 ? git_log_output_encoding
1169 : git_commit_encoding);
1170 if (!encoding)
1171 encoding = "utf-8";
1172 reencoded = logmsg_reencode(commit, encoding);
4234a761 1173 if (reencoded) {
d2c11a38 1174 msg = reencoded;
4234a761
JH
1175 len = strlen(reencoded);
1176 }
3eefc189 1177
3eefc189
JH
1178 if (fmt == CMIT_FMT_ONELINE || fmt == CMIT_FMT_EMAIL)
1179 indent = 0;
e3bc7a3b 1180
c831da66
JH
1181 /* After-subject is used to pass in Content-Type: multipart
1182 * MIME header; in that case we do not have to do the
1183 * plaintext content type even if the commit message has
1184 * non 7-bit ASCII character. Otherwise, check if we need
1185 * to say this is not a 7-bit ASCII.
1186 */
1187 if (fmt == CMIT_FMT_EMAIL && !after_subject) {
0da46771
JH
1188 int i, ch, in_body;
1189
1190 for (in_body = i = 0; (ch = msg[i]) && i < len; i++) {
1191 if (!in_body) {
1192 /* author could be non 7-bit ASCII but
d2c11a38 1193 * the log may be so; skip over the
0da46771
JH
1194 * header part first.
1195 */
1196 if (ch == '\n' &&
1197 i + 1 < len && msg[i+1] == '\n')
1198 in_body = 1;
1199 }
f7e68b29 1200 else if (non_ascii(ch)) {
c831da66 1201 plain_non_ascii = 1;
0da46771
JH
1202 break;
1203 }
1204 }
c831da66
JH
1205 }
1206
4234a761
JH
1207 pp_header(fmt, abbrev, dmode, encoding,
1208 commit, &msg, &len,
1209 &offset, buf_p, space_p);
1210 if (fmt != CMIT_FMT_ONELINE && !subject) {
1211 ALLOC_GROW(*buf_p, offset + 20, *space_p);
1212 (*buf_p)[offset++] = '\n';
80583c0e
JH
1213 }
1214
4234a761 1215 /* Skip excess blank lines at the beginning of body, if any... */
e3bc7a3b 1216 for (;;) {
e3bc7a3b 1217 int linelen = get_one_line(msg, len);
4234a761 1218 int ll = linelen;
e3bc7a3b
LT
1219 if (!linelen)
1220 break;
4234a761 1221 if (!is_empty_line(msg, &ll))
e3bc7a3b 1222 break;
e3bc7a3b
LT
1223 msg += linelen;
1224 len -= linelen;
4234a761 1225 }
000182ea 1226
4234a761
JH
1227 /* These formats treat the title line specially. */
1228 if (fmt == CMIT_FMT_ONELINE
1229 || fmt == CMIT_FMT_EMAIL)
1230 pp_title_line(fmt, &msg, &len, &offset,
1231 buf_p, space_p, indent,
1232 subject, after_subject, encoding,
1233 plain_non_ascii);
19b3bd3e 1234
4234a761
JH
1235 beginning_of_body = offset;
1236 if (fmt != CMIT_FMT_ONELINE)
1237 pp_remainder(fmt, &msg, &len, &offset,
1238 buf_p, space_p, indent);
d87449c5 1239
4234a761 1240 while (offset && isspace((*buf_p)[offset-1]))
40c2fe00 1241 offset--;
4234a761
JH
1242
1243 ALLOC_GROW(*buf_p, offset + 20, *space_p);
1244 buf = *buf_p;
1245
40c2fe00
LT
1246 /* Make sure there is an EOLN for the non-oneline case */
1247 if (fmt != CMIT_FMT_ONELINE)
1248 buf[offset++] = '\n';
4234a761 1249
19b3bd3e 1250 /*
4234a761
JH
1251 * The caller may append additional body text in e-mail
1252 * format. Make sure we did not strip the blank line
1253 * between the header and the body.
19b3bd3e 1254 */
4234a761 1255 if (fmt == CMIT_FMT_EMAIL && offset <= beginning_of_body)
19b3bd3e 1256 buf[offset++] = '\n';
e3bc7a3b 1257 buf[offset] = '\0';
52883fbd 1258 free(reencoded);
e3bc7a3b
LT
1259 return offset;
1260}
a3437b8c
JS
1261
1262struct commit *pop_commit(struct commit_list **stack)
1263{
1264 struct commit_list *top = *stack;
1265 struct commit *item = top ? top->item : NULL;
1266
1267 if (top) {
1268 *stack = top->next;
1269 free(top);
1270 }
1271 return item;
1272}
1273
6b6dcfc2
FK
1274void topo_sort_default_setter(struct commit *c, void *data)
1275{
d3ff6f55 1276 c->util = data;
6b6dcfc2
FK
1277}
1278
1279void *topo_sort_default_getter(struct commit *c)
1280{
d3ff6f55 1281 return c->util;
6b6dcfc2
FK
1282}
1283
ab580ace
JS
1284/*
1285 * Performs an in-place topological sort on the list supplied.
1286 */
4c8725f1 1287void sort_in_topological_order(struct commit_list ** list, int lifo)
6b6dcfc2
FK
1288{
1289 sort_in_topological_order_fn(list, lifo, topo_sort_default_setter,
1290 topo_sort_default_getter);
1291}
1292
1293void sort_in_topological_order_fn(struct commit_list ** list, int lifo,
1294 topo_sort_set_fn_t setter,
1295 topo_sort_get_fn_t getter)
ab580ace
JS
1296{
1297 struct commit_list * next = *list;
2ed02887 1298 struct commit_list * work = NULL, **insert;
ab580ace
JS
1299 struct commit_list ** pptr = list;
1300 struct sort_node * nodes;
1301 struct sort_node * next_nodes;
1302 int count = 0;
1303
1304 /* determine the size of the list */
1305 while (next) {
1306 next = next->next;
1307 count++;
1308 }
a6080a0a 1309
7d6fb370
EW
1310 if (!count)
1311 return;
ab580ace
JS
1312 /* allocate an array to help sort the list */
1313 nodes = xcalloc(count, sizeof(*nodes));
1314 /* link the list to the array */
1315 next_nodes = nodes;
1316 next=*list;
1317 while (next) {
1318 next_nodes->list_item = next;
6b6dcfc2 1319 setter(next->item, next_nodes);
ab580ace
JS
1320 next_nodes++;
1321 next = next->next;
1322 }
1323 /* update the indegree */
1324 next=*list;
1325 while (next) {
1326 struct commit_list * parents = next->item->parents;
1327 while (parents) {
1328 struct commit * parent=parents->item;
6b6dcfc2
FK
1329 struct sort_node * pn = (struct sort_node *) getter(parent);
1330
ab580ace
JS
1331 if (pn)
1332 pn->indegree++;
1333 parents=parents->next;
1334 }
1335 next=next->next;
1336 }
a6080a0a 1337 /*
ab580ace
JS
1338 * find the tips
1339 *
a6080a0a
JH
1340 * tips are nodes not reachable from any other node in the list
1341 *
ab580ace
JS
1342 * the tips serve as a starting set for the work queue.
1343 */
1344 next=*list;
2ed02887 1345 insert = &work;
ab580ace 1346 while (next) {
6b6dcfc2 1347 struct sort_node * node = (struct sort_node *) getter(next->item);
ab580ace
JS
1348
1349 if (node->indegree == 0) {
2ed02887 1350 insert = &commit_list_insert(next->item, insert)->next;
ab580ace
JS
1351 }
1352 next=next->next;
1353 }
4c8725f1 1354
ab580ace 1355 /* process the list in topological order */
4c8725f1
JH
1356 if (!lifo)
1357 sort_by_date(&work);
ab580ace
JS
1358 while (work) {
1359 struct commit * work_item = pop_commit(&work);
6b6dcfc2 1360 struct sort_node * work_node = (struct sort_node *) getter(work_item);
ab580ace
JS
1361 struct commit_list * parents = work_item->parents;
1362
1363 while (parents) {
1364 struct commit * parent=parents->item;
6b6dcfc2
FK
1365 struct sort_node * pn = (struct sort_node *) getter(parent);
1366
ab580ace 1367 if (pn) {
6b6dcfc2 1368 /*
a6080a0a 1369 * parents are only enqueued for emission
ab580ace
JS
1370 * when all their children have been emitted thereby
1371 * guaranteeing topological order.
1372 */
1373 pn->indegree--;
4c8725f1
JH
1374 if (!pn->indegree) {
1375 if (!lifo)
1376 insert_by_date(parent, &work);
1377 else
1378 commit_list_insert(parent, &work);
1379 }
ab580ace
JS
1380 }
1381 parents=parents->next;
1382 }
1383 /*
1384 * work_item is a commit all of whose children
1385 * have already been emitted. we can emit it now.
1386 */
1387 *pptr = work_node->list_item;
1388 pptr = &(*pptr)->next;
1389 *pptr = NULL;
6b6dcfc2 1390 setter(work_item, NULL);
ab580ace
JS
1391 }
1392 free(nodes);
1393}
7c6f8aaf 1394
1295228d 1395/* merge-base stuff */
7c6f8aaf 1396
577ed5c2
JH
1397/* bits #0..15 in revision.h */
1398#define PARENT1 (1u<<16)
1399#define PARENT2 (1u<<17)
1400#define STALE (1u<<18)
1401#define RESULT (1u<<19)
7c6f8aaf 1402
1295228d
JH
1403static const unsigned all_flags = (PARENT1 | PARENT2 | STALE | RESULT);
1404
7c6f8aaf
JS
1405static struct commit *interesting(struct commit_list *list)
1406{
1407 while (list) {
1408 struct commit *commit = list->item;
1409 list = list->next;
542ccefe 1410 if (commit->object.flags & STALE)
7c6f8aaf
JS
1411 continue;
1412 return commit;
1413 }
1414 return NULL;
1415}
1416
f3249438 1417static struct commit_list *merge_bases(struct commit *one, struct commit *two)
7c6f8aaf
JS
1418{
1419 struct commit_list *list = NULL;
1420 struct commit_list *result = NULL;
7c6f8aaf 1421
f3249438
JH
1422 if (one == two)
1423 /* We do not mark this even with RESULT so we do not
1424 * have to clean it up.
1425 */
1426 return commit_list_insert(one, &result);
7c6f8aaf 1427
f3249438
JH
1428 parse_commit(one);
1429 parse_commit(two);
7c6f8aaf 1430
f3249438
JH
1431 one->object.flags |= PARENT1;
1432 two->object.flags |= PARENT2;
1433 insert_by_date(one, &list);
1434 insert_by_date(two, &list);
7c6f8aaf
JS
1435
1436 while (interesting(list)) {
f3249438 1437 struct commit *commit;
7c6f8aaf 1438 struct commit_list *parents;
f3249438
JH
1439 struct commit_list *n;
1440 int flags;
7c6f8aaf 1441
f3249438
JH
1442 commit = list->item;
1443 n = list->next;
1444 free(list);
1445 list = n;
7c6f8aaf 1446
f3249438
JH
1447 flags = commit->object.flags & (PARENT1 | PARENT2 | STALE);
1448 if (flags == (PARENT1 | PARENT2)) {
1449 if (!(commit->object.flags & RESULT)) {
1450 commit->object.flags |= RESULT;
1451 insert_by_date(commit, &result);
1452 }
542ccefe
JH
1453 /* Mark parents of a found merge stale */
1454 flags |= STALE;
7c6f8aaf
JS
1455 }
1456 parents = commit->parents;
1457 while (parents) {
1458 struct commit *p = parents->item;
1459 parents = parents->next;
1460 if ((p->object.flags & flags) == flags)
1461 continue;
1462 parse_commit(p);
1463 p->object.flags |= flags;
1464 insert_by_date(p, &list);
1465 }
1466 }
1467
f3249438 1468 /* Clean up the result to remove stale ones */
1295228d 1469 free_commit_list(list);
f3249438
JH
1470 list = result; result = NULL;
1471 while (list) {
1472 struct commit_list *n = list->next;
1473 if (!(list->item->object.flags & STALE))
1474 insert_by_date(list->item, &result);
1475 free(list);
1476 list = n;
1477 }
1478 return result;
1479}
7c6f8aaf 1480
f3249438
JH
1481struct commit_list *get_merge_bases(struct commit *one,
1482 struct commit *two,
1483 int cleanup)
1484{
f3249438
JH
1485 struct commit_list *list;
1486 struct commit **rslt;
1487 struct commit_list *result;
1488 int cnt, i, j;
1489
1490 result = merge_bases(one, two);
1491 if (one == two)
1492 return result;
1493 if (!result || !result->next) {
1494 if (cleanup) {
1495 clear_commit_marks(one, all_flags);
1496 clear_commit_marks(two, all_flags);
7c6f8aaf 1497 }
f3249438 1498 return result;
7c6f8aaf
JS
1499 }
1500
f3249438
JH
1501 /* There are more than one */
1502 cnt = 0;
1503 list = result;
1504 while (list) {
1505 list = list->next;
1506 cnt++;
1507 }
1508 rslt = xcalloc(cnt, sizeof(*rslt));
1509 for (list = result, i = 0; list; list = list->next)
1510 rslt[i++] = list->item;
1511 free_commit_list(result);
1512
1513 clear_commit_marks(one, all_flags);
1514 clear_commit_marks(two, all_flags);
1515 for (i = 0; i < cnt - 1; i++) {
1516 for (j = i+1; j < cnt; j++) {
1517 if (!rslt[i] || !rslt[j])
1518 continue;
1519 result = merge_bases(rslt[i], rslt[j]);
1520 clear_commit_marks(rslt[i], all_flags);
1521 clear_commit_marks(rslt[j], all_flags);
1522 for (list = result; list; list = list->next) {
1523 if (rslt[i] == list->item)
1524 rslt[i] = NULL;
1525 if (rslt[j] == list->item)
1526 rslt[j] = NULL;
1527 }
1528 }
58ecf5c1 1529 }
7c6f8aaf 1530
f3249438
JH
1531 /* Surviving ones in rslt[] are the independent results */
1532 result = NULL;
1533 for (i = 0; i < cnt; i++) {
1534 if (rslt[i])
1535 insert_by_date(rslt[i], &result);
1536 }
1537 free(rslt);
7c6f8aaf
JS
1538 return result;
1539}
2ecd2bbc 1540
03840fc3 1541int in_merge_bases(struct commit *commit, struct commit **reference, int num)
2ecd2bbc
JH
1542{
1543 struct commit_list *bases, *b;
1544 int ret = 0;
1545
03840fc3
JH
1546 if (num == 1)
1547 bases = get_merge_bases(commit, *reference, 1);
1548 else
1549 die("not yet");
2ecd2bbc 1550 for (b = bases; b; b = b->next) {
03840fc3 1551 if (!hashcmp(commit->object.sha1, b->item->object.sha1)) {
2ecd2bbc
JH
1552 ret = 1;
1553 break;
1554 }
1555 }
1556
1557 free_commit_list(bases);
1558 return ret;
1559}