Code

Do not expect unlink(2) to fail on a directory.
[git.git] / commit.c
1 #include "cache.h"
2 #include "tag.h"
3 #include "commit.h"
4 #include "pkt-line.h"
5 #include "utf8.h"
6 #include "interpolate.h"
7 #include "diff.h"
8 #include "revision.h"
10 int save_commit_buffer = 1;
12 struct sort_node
13 {
14         /*
15          * the number of children of the associated commit
16          * that also occur in the list being sorted.
17          */
18         unsigned int indegree;
20         /*
21          * reference to original list item that we will re-use
22          * on output.
23          */
24         struct commit_list * list_item;
26 };
28 const char *commit_type = "commit";
30 struct cmt_fmt_map {
31         const char *n;
32         size_t cmp_len;
33         enum cmit_fmt v;
34 } cmt_fmts[] = {
35         { "raw",        1,      CMIT_FMT_RAW },
36         { "medium",     1,      CMIT_FMT_MEDIUM },
37         { "short",      1,      CMIT_FMT_SHORT },
38         { "email",      1,      CMIT_FMT_EMAIL },
39         { "full",       5,      CMIT_FMT_FULL },
40         { "fuller",     5,      CMIT_FMT_FULLER },
41         { "oneline",    1,      CMIT_FMT_ONELINE },
42         { "format:",    7,      CMIT_FMT_USERFORMAT},
43 };
45 static char *user_format;
47 enum cmit_fmt get_commit_format(const char *arg)
48 {
49         int i;
51         if (!arg || !*arg)
52                 return CMIT_FMT_DEFAULT;
53         if (*arg == '=')
54                 arg++;
55         if (!prefixcmp(arg, "format:")) {
56                 if (user_format)
57                         free(user_format);
58                 user_format = xstrdup(arg + 7);
59                 return CMIT_FMT_USERFORMAT;
60         }
61         for (i = 0; i < ARRAY_SIZE(cmt_fmts); i++) {
62                 if (!strncmp(arg, cmt_fmts[i].n, cmt_fmts[i].cmp_len) &&
63                     !strncmp(arg, cmt_fmts[i].n, strlen(arg)))
64                         return cmt_fmts[i].v;
65         }
67         die("invalid --pretty format: %s", arg);
68 }
70 static struct commit *check_commit(struct object *obj,
71                                    const unsigned char *sha1,
72                                    int quiet)
73 {
74         if (obj->type != OBJ_COMMIT) {
75                 if (!quiet)
76                         error("Object %s is a %s, not a commit",
77                               sha1_to_hex(sha1), typename(obj->type));
78                 return NULL;
79         }
80         return (struct commit *) obj;
81 }
83 struct commit *lookup_commit_reference_gently(const unsigned char *sha1,
84                                               int quiet)
85 {
86         struct object *obj = deref_tag(parse_object(sha1), NULL, 0);
88         if (!obj)
89                 return NULL;
90         return check_commit(obj, sha1, quiet);
91 }
93 struct commit *lookup_commit_reference(const unsigned char *sha1)
94 {
95         return lookup_commit_reference_gently(sha1, 0);
96 }
98 struct commit *lookup_commit(const unsigned char *sha1)
99 {
100         struct object *obj = lookup_object(sha1);
101         if (!obj)
102                 return create_object(sha1, OBJ_COMMIT, alloc_commit_node());
103         if (!obj->type)
104                 obj->type = OBJ_COMMIT;
105         return check_commit(obj, sha1, 0);
108 static unsigned long parse_commit_date(const char *buf)
110         unsigned long date;
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;
126 static struct commit_graft **commit_graft;
127 static int commit_graft_alloc, commit_graft_nr;
129 static int commit_graft_pos(const unsigned char *sha1)
131         int lo, hi;
132         lo = 0;
133         hi = commit_graft_nr;
134         while (lo < hi) {
135                 int mi = (lo + hi) / 2;
136                 struct commit_graft *graft = commit_graft[mi];
137                 int cmp = hashcmp(sha1, graft->sha1);
138                 if (!cmp)
139                         return mi;
140                 if (cmp < 0)
141                         hi = mi;
142                 else
143                         lo = mi + 1;
144         }
145         return -lo - 1;
148 int register_commit_graft(struct commit_graft *graft, int ignore_dups)
150         int pos = commit_graft_pos(graft->sha1);
151         
152         if (0 <= pos) {
153                 if (ignore_dups)
154                         free(graft);
155                 else {
156                         free(commit_graft[pos]);
157                         commit_graft[pos] = graft;
158                 }
159                 return 1;
160         }
161         pos = -pos - 1;
162         if (commit_graft_alloc <= ++commit_graft_nr) {
163                 commit_graft_alloc = alloc_nr(commit_graft_alloc);
164                 commit_graft = xrealloc(commit_graft,
165                                         sizeof(*commit_graft) *
166                                         commit_graft_alloc);
167         }
168         if (pos < commit_graft_nr)
169                 memmove(commit_graft + pos + 1,
170                         commit_graft + pos,
171                         (commit_graft_nr - pos - 1) *
172                         sizeof(*commit_graft));
173         commit_graft[pos] = graft;
174         return 0;
177 struct commit_graft *read_graft_line(char *buf, int len)
179         /* The format is just "Commit Parent1 Parent2 ...\n" */
180         int i;
181         struct commit_graft *graft = NULL;
183         if (buf[len-1] == '\n')
184                 buf[--len] = 0;
185         if (buf[0] == '#' || buf[0] == '\0')
186                 return NULL;
187         if ((len + 1) % 41) {
188         bad_graft_data:
189                 error("bad graft data: %s", buf);
190                 free(graft);
191                 return NULL;
192         }
193         i = (len + 1) / 41 - 1;
194         graft = xmalloc(sizeof(*graft) + 20 * i);
195         graft->nr_parent = i;
196         if (get_sha1_hex(buf, graft->sha1))
197                 goto bad_graft_data;
198         for (i = 40; i < len; i += 41) {
199                 if (buf[i] != ' ')
200                         goto bad_graft_data;
201                 if (get_sha1_hex(buf + i + 1, graft->parent[i/41]))
202                         goto bad_graft_data;
203         }
204         return graft;
207 int read_graft_file(const char *graft_file)
209         FILE *fp = fopen(graft_file, "r");
210         char buf[1024];
211         if (!fp)
212                 return -1;
213         while (fgets(buf, sizeof(buf), fp)) {
214                 /* The format is just "Commit Parent1 Parent2 ...\n" */
215                 int len = strlen(buf);
216                 struct commit_graft *graft = read_graft_line(buf, len);
217                 if (!graft)
218                         continue;
219                 if (register_commit_graft(graft, 1))
220                         error("duplicate graft data: %s", buf);
221         }
222         fclose(fp);
223         return 0;
226 static void prepare_commit_graft(void)
228         static int commit_graft_prepared;
229         char *graft_file;
231         if (commit_graft_prepared)
232                 return;
233         graft_file = get_graft_file();
234         read_graft_file(graft_file);
235         /* make sure shallows are read */
236         is_repository_shallow();
237         commit_graft_prepared = 1;
240 static struct commit_graft *lookup_commit_graft(const unsigned char *sha1)
242         int pos;
243         prepare_commit_graft();
244         pos = commit_graft_pos(sha1);
245         if (pos < 0)
246                 return NULL;
247         return commit_graft[pos];
250 int write_shallow_commits(int fd, int use_pack_protocol)
252         int i, count = 0;
253         for (i = 0; i < commit_graft_nr; i++)
254                 if (commit_graft[i]->nr_parent < 0) {
255                         const char *hex =
256                                 sha1_to_hex(commit_graft[i]->sha1);
257                         count++;
258                         if (use_pack_protocol)
259                                 packet_write(fd, "shallow %s", hex);
260                         else {
261                                 if (write_in_full(fd, hex,  40) != 40)
262                                         break;
263                                 if (write_in_full(fd, "\n", 1) != 1)
264                                         break;
265                         }
266                 }
267         return count;
270 int unregister_shallow(const unsigned char *sha1)
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;
283 int parse_commit_buffer(struct commit *item, void *buffer, unsigned long size)
285         char *tail = buffer;
286         char *bufptr = buffer;
287         unsigned char parent[20];
288         struct commit_list **pptr;
289         struct commit_graft *graft;
290         unsigned n_refs = 0;
292         if (item->object.parsed)
293                 return 0;
294         item->object.parsed = 1;
295         tail += size;
296         if (tail <= bufptr + 5 || memcmp(bufptr, "tree ", 5))
297                 return error("bogus commit object %s", sha1_to_hex(item->object.sha1));
298         if (tail <= bufptr + 45 || get_sha1_hex(bufptr + 5, parent) < 0)
299                 return error("bad tree pointer in commit %s",
300                              sha1_to_hex(item->object.sha1));
301         item->tree = lookup_tree(parent);
302         if (item->tree)
303                 n_refs++;
304         bufptr += 46; /* "tree " + "hex sha1" + "\n" */
305         pptr = &item->parents;
307         graft = lookup_commit_graft(item->object.sha1);
308         while (bufptr + 48 < tail && !memcmp(bufptr, "parent ", 7)) {
309                 struct commit *new_parent;
311                 if (tail <= bufptr + 48 ||
312                     get_sha1_hex(bufptr + 7, parent) ||
313                     bufptr[47] != '\n')
314                         return error("bad parents in commit %s", sha1_to_hex(item->object.sha1));
315                 bufptr += 48;
316                 if (graft)
317                         continue;
318                 new_parent = lookup_commit(parent);
319                 if (new_parent) {
320                         pptr = &commit_list_insert(new_parent, pptr)->next;
321                         n_refs++;
322                 }
323         }
324         if (graft) {
325                 int i;
326                 struct commit *new_parent;
327                 for (i = 0; i < graft->nr_parent; i++) {
328                         new_parent = lookup_commit(graft->parent[i]);
329                         if (!new_parent)
330                                 continue;
331                         pptr = &commit_list_insert(new_parent, pptr)->next;
332                         n_refs++;
333                 }
334         }
335         item->date = parse_commit_date(bufptr);
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         }
348         return 0;
351 int parse_commit(struct commit *item)
353         enum object_type type;
354         void *buffer;
355         unsigned long size;
356         int ret;
358         if (item->object.parsed)
359                 return 0;
360         buffer = read_sha1_file(item->object.sha1, &type, &size);
361         if (!buffer)
362                 return error("Could not read %s",
363                              sha1_to_hex(item->object.sha1));
364         if (type != OBJ_COMMIT) {
365                 free(buffer);
366                 return error("Object %s not a commit",
367                              sha1_to_hex(item->object.sha1));
368         }
369         ret = parse_commit_buffer(item, buffer, size);
370         if (save_commit_buffer && !ret) {
371                 item->buffer = buffer;
372                 return 0;
373         }
374         free(buffer);
375         return ret;
378 struct commit_list *commit_list_insert(struct commit *item, struct commit_list **list_p)
380         struct commit_list *new_list = xmalloc(sizeof(struct commit_list));
381         new_list->item = item;
382         new_list->next = *list_p;
383         *list_p = new_list;
384         return new_list;
387 void free_commit_list(struct commit_list *list)
389         while (list) {
390                 struct commit_list *temp = list;
391                 list = temp->next;
392                 free(temp);
393         }
396 struct commit_list * insert_by_date(struct commit *item, struct commit_list **list)
398         struct commit_list **pp = list;
399         struct commit_list *p;
400         while ((p = *pp) != NULL) {
401                 if (p->item->date < item->date) {
402                         break;
403                 }
404                 pp = &p->next;
405         }
406         return commit_list_insert(item, pp);
409         
410 void sort_by_date(struct commit_list **list)
412         struct commit_list *ret = NULL;
413         while (*list) {
414                 insert_by_date((*list)->item, &ret);
415                 *list = (*list)->next;
416         }
417         *list = ret;
420 struct commit *pop_most_recent_commit(struct commit_list **list,
421                                       unsigned int mark)
423         struct commit *ret = (*list)->item;
424         struct commit_list *parents = ret->parents;
425         struct commit_list *old = *list;
427         *list = (*list)->next;
428         free(old);
430         while (parents) {
431                 struct commit *commit = parents->item;
432                 parse_commit(commit);
433                 if (!(commit->object.flags & mark)) {
434                         commit->object.flags |= mark;
435                         insert_by_date(commit, list);
436                 }
437                 parents = parents->next;
438         }
439         return ret;
442 void clear_commit_marks(struct commit *commit, unsigned int mark)
444         struct commit_list *parents;
446         commit->object.flags &= ~mark;
447         parents = commit->parents;
448         while (parents) {
449                 struct commit *parent = parents->item;
451                 /* Have we already cleared this? */
452                 if (mark & parent->object.flags)
453                         clear_commit_marks(parent, mark);
454                 parents = parents->next;
455         }
458 /*
459  * Generic support for pretty-printing the header
460  */
461 static int get_one_line(const char *msg, unsigned long len)
463         int ret = 0;
465         while (len--) {
466                 char c = *msg++;
467                 if (!c)
468                         break;
469                 ret++;
470                 if (c == '\n')
471                         break;
472         }
473         return ret;
476 /* High bit set, or ISO-2022-INT */
477 static int non_ascii(int ch)
479         ch = (ch & 0xff);
480         return ((ch & 0x80) || (ch == 0x1b));
483 static int is_rfc2047_special(char ch)
485         return (non_ascii(ch) || (ch == '=') || (ch == '?') || (ch == '_'));
488 static int add_rfc2047(char *buf, const char *line, int len,
489                        const char *encoding)
491         char *bp = buf;
492         int i, needquote;
493         char q_encoding[128];
494         const char *q_encoding_fmt = "=?%s?q?";
496         for (i = needquote = 0; !needquote && i < len; i++) {
497                 int ch = line[i];
498                 if (non_ascii(ch))
499                         needquote++;
500                 if ((i + 1 < len) &&
501                     (ch == '=' && line[i+1] == '?'))
502                         needquote++;
503         }
504         if (!needquote)
505                 return sprintf(buf, "%.*s", len, line);
507         i = snprintf(q_encoding, sizeof(q_encoding), q_encoding_fmt, encoding);
508         if (sizeof(q_encoding) < i)
509                 die("Insanely long encoding name %s", encoding);
510         memcpy(bp, q_encoding, i);
511         bp += i;
512         for (i = 0; i < len; i++) {
513                 unsigned ch = line[i] & 0xFF;
514                 /*
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 == ' ') {
521                         sprintf(bp, "=%02X", ch);
522                         bp += 3;
523                 }
524                 else
525                         *bp++ = ch;
526         }
527         memcpy(bp, "?=", 2);
528         bp += 2;
529         return bp - buf;
532 static int add_user_info(const char *what, enum cmit_fmt fmt, char *buf,
533                          const char *line, enum date_mode dmode,
534                          const char *encoding)
536         char *date;
537         int namelen;
538         unsigned long time;
539         int tz, ret;
540         const char *filler = "    ";
542         if (fmt == CMIT_FMT_ONELINE)
543                 return 0;
544         date = strchr(line, '>');
545         if (!date)
546                 return 0;
547         namelen = ++date - line;
548         time = strtoul(date, &date, 10);
549         tz = strtol(date, NULL, 10);
551         if (fmt == CMIT_FMT_EMAIL) {
552                 char *name_tail = strchr(line, '<');
553                 int display_name_length;
554                 if (!name_tail)
555                         return 0;
556                 while (line < name_tail && isspace(name_tail[-1]))
557                         name_tail--;
558                 display_name_length = name_tail - line;
559                 filler = "";
560                 strcpy(buf, "From: ");
561                 ret = strlen(buf);
562                 ret += add_rfc2047(buf + ret, line, display_name_length,
563                                    encoding);
564                 memcpy(buf + ret, name_tail, namelen - display_name_length);
565                 ret += namelen - display_name_length;
566                 buf[ret++] = '\n';
567         }
568         else {
569                 ret = sprintf(buf, "%s: %.*s%.*s\n", what,
570                               (fmt == CMIT_FMT_FULLER) ? 4 : 0,
571                               filler, namelen, line);
572         }
573         switch (fmt) {
574         case CMIT_FMT_MEDIUM:
575                 ret += sprintf(buf + ret, "Date:   %s\n",
576                                show_date(time, tz, dmode));
577                 break;
578         case CMIT_FMT_EMAIL:
579                 ret += sprintf(buf + ret, "Date: %s\n",
580                                show_rfc2822_date(time, tz));
581                 break;
582         case CMIT_FMT_FULLER:
583                 ret += sprintf(buf + ret, "%sDate: %s\n", what,
584                                show_date(time, tz, dmode));
585                 break;
586         default:
587                 /* notin' */
588                 break;
589         }
590         return ret;
593 static int is_empty_line(const char *line, int *len_p)
595         int len = *len_p;
596         while (len && isspace(line[len-1]))
597                 len--;
598         *len_p = len;
599         return !len;
602 static int add_merge_info(enum cmit_fmt fmt, char *buf, const struct commit *commit, int abbrev)
604         struct commit_list *parent = commit->parents;
605         int offset;
607         if ((fmt == CMIT_FMT_ONELINE) || (fmt == CMIT_FMT_EMAIL) ||
608             !parent || !parent->next)
609                 return 0;
611         offset = sprintf(buf, "Merge:");
613         while (parent) {
614                 struct commit *p = parent->item;
615                 const char *hex = NULL;
616                 const char *dots;
617                 if (abbrev)
618                         hex = find_unique_abbrev(p->object.sha1, abbrev);
619                 if (!hex)
620                         hex = sha1_to_hex(p->object.sha1);
621                 dots = (abbrev && strlen(hex) != 40) ?  "..." : "";
622                 parent = parent->next;
624                 offset += sprintf(buf + offset, " %s%s", hex, dots);
625         }
626         buf[offset++] = '\n';
627         return offset;
630 static char *get_header(const struct commit *commit, const char *key)
632         int key_len = strlen(key);
633         const char *line = commit->buffer;
635         for (;;) {
636                 const char *eol = strchr(line, '\n'), *next;
638                 if (line == eol)
639                         return NULL;
640                 if (!eol) {
641                         eol = line + strlen(line);
642                         next = NULL;
643                 } else
644                         next = eol + 1;
645                 if (eol - line > key_len &&
646                     !strncmp(line, key, key_len) &&
647                     line[key_len] == ' ') {
648                         int len = eol - line - key_len;
649                         char *ret = xmalloc(len);
650                         memcpy(ret, line + key_len + 1, len - 1);
651                         ret[len - 1] = '\0';
652                         return ret;
653                 }
654                 line = next;
655         }
658 static char *replace_encoding_header(char *buf, const char *encoding)
660         char *encoding_header = strstr(buf, "\nencoding ");
661         char *header_end = strstr(buf, "\n\n");
662         char *end_of_encoding_header;
663         int encoding_header_pos;
664         int encoding_header_len;
665         int new_len;
666         int need_len;
667         int buflen = strlen(buf) + 1;
669         if (!header_end)
670                 header_end = buf + buflen;
671         if (!encoding_header || encoding_header >= header_end)
672                 return buf;
673         encoding_header++;
674         end_of_encoding_header = strchr(encoding_header, '\n');
675         if (!end_of_encoding_header)
676                 return buf; /* should not happen but be defensive */
677         end_of_encoding_header++;
679         encoding_header_len = end_of_encoding_header - encoding_header;
680         encoding_header_pos = encoding_header - buf;
682         if (is_encoding_utf8(encoding)) {
683                 /* we have re-coded to UTF-8; drop the header */
684                 memmove(encoding_header, end_of_encoding_header,
685                         buflen - (encoding_header_pos + encoding_header_len));
686                 return buf;
687         }
688         new_len = strlen(encoding);
689         need_len = new_len + strlen("encoding \n");
690         if (encoding_header_len < need_len) {
691                 buf = xrealloc(buf, buflen + (need_len - encoding_header_len));
692                 encoding_header = buf + encoding_header_pos;
693                 end_of_encoding_header = encoding_header + encoding_header_len;
694         }
695         memmove(end_of_encoding_header + (need_len - encoding_header_len),
696                 end_of_encoding_header,
697                 buflen - (encoding_header_pos + encoding_header_len));
698         memcpy(encoding_header + 9, encoding, strlen(encoding));
699         encoding_header[9 + new_len] = '\n';
700         return buf;
703 static char *logmsg_reencode(const struct commit *commit,
704                              const char *output_encoding)
706         static const char *utf8 = "utf-8";
707         const char *use_encoding;
708         char *encoding;
709         char *out;
711         if (!*output_encoding)
712                 return NULL;
713         encoding = get_header(commit, "encoding");
714         use_encoding = encoding ? encoding : utf8;
715         if (!strcmp(use_encoding, output_encoding))
716                 out = xstrdup(commit->buffer);
717         else
718                 out = reencode_string(commit->buffer,
719                                       output_encoding, use_encoding);
720         if (out)
721                 out = replace_encoding_header(out, output_encoding);
723         free(encoding);
724         return out;
727 static void fill_person(struct interp *table, const char *msg, int len)
729         int start, end, tz = 0;
730         unsigned long date;
731         char *ep;
733         /* parse name */
734         for (end = 0; end < len && msg[end] != '<'; end++)
735                 ; /* do nothing */
736         start = end + 1;
737         while (end > 0 && isspace(msg[end - 1]))
738                 end--;
739         table[0].value = xstrndup(msg, end);
741         if (start >= len)
742                 return;
744         /* parse email */
745         for (end = start + 1; end < len && msg[end] != '>'; end++)
746                 ; /* do nothing */
748         if (end >= len)
749                 return;
751         table[1].value = xstrndup(msg + start, end - start);
753         /* parse date */
754         for (start = end + 1; start < len && isspace(msg[start]); start++)
755                 ; /* do nothing */
756         if (start >= len)
757                 return;
758         date = strtoul(msg + start, &ep, 10);
759         if (msg + start == ep)
760                 return;
762         table[5].value = xstrndup(msg + start, ep - (msg + start));
764         /* parse tz */
765         for (start = ep - msg + 1; start < len && isspace(msg[start]); start++)
766                 ; /* do nothing */
767         if (start + 1 < len) {
768                 tz = strtoul(msg + start + 1, NULL, 10);
769                 if (msg[start] == '-')
770                         tz = -tz;
771         }
773         interp_set_entry(table, 2, show_date(date, tz, 0));
774         interp_set_entry(table, 3, show_rfc2822_date(date, tz));
775         interp_set_entry(table, 4, show_date(date, tz, 1));
778 static long format_commit_message(const struct commit *commit,
779                 const char *msg, char *buf, unsigned long space)
781         struct interp table[] = {
782                 { "%H" },       /* commit hash */
783                 { "%h" },       /* abbreviated commit hash */
784                 { "%T" },       /* tree hash */
785                 { "%t" },       /* abbreviated tree hash */
786                 { "%P" },       /* parent hashes */
787                 { "%p" },       /* abbreviated parent hashes */
788                 { "%an" },      /* author name */
789                 { "%ae" },      /* author email */
790                 { "%ad" },      /* author date */
791                 { "%aD" },      /* author date, RFC2822 style */
792                 { "%ar" },      /* author date, relative */
793                 { "%at" },      /* author date, UNIX timestamp */
794                 { "%cn" },      /* committer name */
795                 { "%ce" },      /* committer email */
796                 { "%cd" },      /* committer date */
797                 { "%cD" },      /* committer date, RFC2822 style */
798                 { "%cr" },      /* committer date, relative */
799                 { "%ct" },      /* committer date, UNIX timestamp */
800                 { "%e" },       /* encoding */
801                 { "%s" },       /* subject */
802                 { "%b" },       /* body */
803                 { "%Cred" },    /* red */
804                 { "%Cgreen" },  /* green */
805                 { "%Cblue" },   /* blue */
806                 { "%Creset" },  /* reset color */
807                 { "%n" },       /* newline */
808                 { "%m" },       /* left/right/bottom */
809         };
810         enum interp_index {
811                 IHASH = 0, IHASH_ABBREV,
812                 ITREE, ITREE_ABBREV,
813                 IPARENTS, IPARENTS_ABBREV,
814                 IAUTHOR_NAME, IAUTHOR_EMAIL,
815                 IAUTHOR_DATE, IAUTHOR_DATE_RFC2822, IAUTHOR_DATE_RELATIVE,
816                 IAUTHOR_TIMESTAMP,
817                 ICOMMITTER_NAME, ICOMMITTER_EMAIL,
818                 ICOMMITTER_DATE, ICOMMITTER_DATE_RFC2822,
819                 ICOMMITTER_DATE_RELATIVE, ICOMMITTER_TIMESTAMP,
820                 IENCODING,
821                 ISUBJECT,
822                 IBODY,
823                 IRED, IGREEN, IBLUE, IRESET_COLOR,
824                 INEWLINE,
825                 ILEFT_RIGHT,
826         };
827         struct commit_list *p;
828         char parents[1024];
829         int i;
830         enum { HEADER, SUBJECT, BODY } state;
832         if (ILEFT_RIGHT + 1 != ARRAY_SIZE(table))
833                 die("invalid interp table!");
835         /* these are independent of the commit */
836         interp_set_entry(table, IRED, "\033[31m");
837         interp_set_entry(table, IGREEN, "\033[32m");
838         interp_set_entry(table, IBLUE, "\033[34m");
839         interp_set_entry(table, IRESET_COLOR, "\033[m");
840         interp_set_entry(table, INEWLINE, "\n");
842         /* these depend on the commit */
843         if (!commit->object.parsed)
844                 parse_object(commit->object.sha1);
845         interp_set_entry(table, IHASH, sha1_to_hex(commit->object.sha1));
846         interp_set_entry(table, IHASH_ABBREV,
847                         find_unique_abbrev(commit->object.sha1,
848                                 DEFAULT_ABBREV));
849         interp_set_entry(table, ITREE, sha1_to_hex(commit->tree->object.sha1));
850         interp_set_entry(table, ITREE_ABBREV,
851                         find_unique_abbrev(commit->tree->object.sha1,
852                                 DEFAULT_ABBREV));
853         interp_set_entry(table, ILEFT_RIGHT,
854                          (commit->object.flags & BOUNDARY)
855                          ? "-"
856                          : (commit->object.flags & SYMMETRIC_LEFT)
857                          ? "<"
858                          : ">");
860         parents[1] = 0;
861         for (i = 0, p = commit->parents;
862                         p && i < sizeof(parents) - 1;
863                         p = p->next)
864                 i += snprintf(parents + i, sizeof(parents) - i - 1, " %s",
865                         sha1_to_hex(p->item->object.sha1));
866         interp_set_entry(table, IPARENTS, parents + 1);
868         parents[1] = 0;
869         for (i = 0, p = commit->parents;
870                         p && i < sizeof(parents) - 1;
871                         p = p->next)
872                 i += snprintf(parents + i, sizeof(parents) - i - 1, " %s",
873                         find_unique_abbrev(p->item->object.sha1,
874                                 DEFAULT_ABBREV));
875         interp_set_entry(table, IPARENTS_ABBREV, parents + 1);
877         for (i = 0, state = HEADER; msg[i] && state < BODY; i++) {
878                 int eol;
879                 for (eol = i; msg[eol] && msg[eol] != '\n'; eol++)
880                         ; /* do nothing */
882                 if (state == SUBJECT) {
883                         table[ISUBJECT].value = xstrndup(msg + i, eol - i);
884                         i = eol;
885                 }
886                 if (i == eol) {
887                         state++;
888                         /* strip empty lines */
889                         while (msg[eol + 1] == '\n')
890                                 eol++;
891                 } else if (!prefixcmp(msg + i, "author "))
892                         fill_person(table + IAUTHOR_NAME,
893                                         msg + i + 7, eol - i - 7);
894                 else if (!prefixcmp(msg + i, "committer "))
895                         fill_person(table + ICOMMITTER_NAME,
896                                         msg + i + 10, eol - i - 10);
897                 else if (!prefixcmp(msg + i, "encoding "))
898                         table[IENCODING].value =
899                                 xstrndup(msg + i + 9, eol - i - 9);
900                 i = eol;
901         }
902         if (msg[i])
903                 table[IBODY].value = xstrdup(msg + i);
904         for (i = 0; i < ARRAY_SIZE(table); i++)
905                 if (!table[i].value)
906                         interp_set_entry(table, i, "<unknown>");
908         interpolate(buf, space, user_format, table, ARRAY_SIZE(table));
909         interp_clear_table(table, ARRAY_SIZE(table));
911         return strlen(buf);
914 unsigned long pretty_print_commit(enum cmit_fmt fmt,
915                                   const struct commit *commit,
916                                   unsigned long len,
917                                   char *buf, unsigned long space,
918                                   int abbrev, const char *subject,
919                                   const char *after_subject,
920                                   enum date_mode dmode)
922         int hdr = 1, body = 0, seen_title = 0;
923         unsigned long offset = 0;
924         int indent = 4;
925         int parents_shown = 0;
926         const char *msg = commit->buffer;
927         int plain_non_ascii = 0;
928         char *reencoded;
929         const char *encoding;
931         if (fmt == CMIT_FMT_USERFORMAT)
932                 return format_commit_message(commit, msg, buf, space);
934         encoding = (git_log_output_encoding
935                     ? git_log_output_encoding
936                     : git_commit_encoding);
937         if (!encoding)
938                 encoding = "utf-8";
939         reencoded = logmsg_reencode(commit, encoding);
940         if (reencoded)
941                 msg = reencoded;
943         if (fmt == CMIT_FMT_ONELINE || fmt == CMIT_FMT_EMAIL)
944                 indent = 0;
946         /* After-subject is used to pass in Content-Type: multipart
947          * MIME header; in that case we do not have to do the
948          * plaintext content type even if the commit message has
949          * non 7-bit ASCII character.  Otherwise, check if we need
950          * to say this is not a 7-bit ASCII.
951          */
952         if (fmt == CMIT_FMT_EMAIL && !after_subject) {
953                 int i, ch, in_body;
955                 for (in_body = i = 0; (ch = msg[i]) && i < len; i++) {
956                         if (!in_body) {
957                                 /* author could be non 7-bit ASCII but
958                                  * the log may be so; skip over the
959                                  * header part first.
960                                  */
961                                 if (ch == '\n' &&
962                                     i + 1 < len && msg[i+1] == '\n')
963                                         in_body = 1;
964                         }
965                         else if (non_ascii(ch)) {
966                                 plain_non_ascii = 1;
967                                 break;
968                         }
969                 }
970         }
972         for (;;) {
973                 const char *line = msg;
974                 int linelen = get_one_line(msg, len);
976                 if (!linelen)
977                         break;
979                 /*
980                  * We want some slop for indentation and a possible
981                  * final "...". Thus the "+ 20".
982                  */
983                 if (offset + linelen + 20 > space) {
984                         memcpy(buf + offset, "    ...\n", 8);
985                         offset += 8;
986                         break;
987                 }
989                 msg += linelen;
990                 len -= linelen;
991                 if (hdr) {
992                         if (linelen == 1) {
993                                 hdr = 0;
994                                 if ((fmt != CMIT_FMT_ONELINE) && !subject)
995                                         buf[offset++] = '\n';
996                                 continue;
997                         }
998                         if (fmt == CMIT_FMT_RAW) {
999                                 memcpy(buf + offset, line, linelen);
1000                                 offset += linelen;
1001                                 continue;
1002                         }
1003                         if (!memcmp(line, "parent ", 7)) {
1004                                 if (linelen != 48)
1005                                         die("bad parent line in commit");
1006                                 continue;
1007                         }
1009                         if (!parents_shown) {
1010                                 offset += add_merge_info(fmt, buf + offset,
1011                                                          commit, abbrev);
1012                                 parents_shown = 1;
1013                                 continue;
1014                         }
1015                         /*
1016                          * MEDIUM == DEFAULT shows only author with dates.
1017                          * FULL shows both authors but not dates.
1018                          * FULLER shows both authors and dates.
1019                          */
1020                         if (!memcmp(line, "author ", 7))
1021                                 offset += add_user_info("Author", fmt,
1022                                                         buf + offset,
1023                                                         line + 7,
1024                                                         dmode,
1025                                                         encoding);
1026                         if (!memcmp(line, "committer ", 10) &&
1027                             (fmt == CMIT_FMT_FULL || fmt == CMIT_FMT_FULLER))
1028                                 offset += add_user_info("Commit", fmt,
1029                                                         buf + offset,
1030                                                         line + 10,
1031                                                         dmode,
1032                                                         encoding);
1033                         continue;
1034                 }
1036                 if (!subject)
1037                         body = 1;
1039                 if (is_empty_line(line, &linelen)) {
1040                         if (!seen_title)
1041                                 continue;
1042                         if (!body)
1043                                 continue;
1044                         if (subject)
1045                                 continue;
1046                         if (fmt == CMIT_FMT_SHORT)
1047                                 break;
1048                 }
1050                 seen_title = 1;
1051                 if (subject) {
1052                         int slen = strlen(subject);
1053                         memcpy(buf + offset, subject, slen);
1054                         offset += slen;
1055                         offset += add_rfc2047(buf + offset, line, linelen,
1056                                               encoding);
1057                 }
1058                 else {
1059                         memset(buf + offset, ' ', indent);
1060                         memcpy(buf + offset + indent, line, linelen);
1061                         offset += linelen + indent;
1062                 }
1063                 buf[offset++] = '\n';
1064                 if (fmt == CMIT_FMT_ONELINE)
1065                         break;
1066                 if (subject && plain_non_ascii) {
1067                         int sz;
1068                         char header[512];
1069                         const char *header_fmt =
1070                                 "MIME-Version: 1.0\n"
1071                                 "Content-Type: text/plain; charset=%s\n"
1072                                 "Content-Transfer-Encoding: 8bit\n";
1073                         sz = snprintf(header, sizeof(header), header_fmt,
1074                                       encoding);
1075                         if (sizeof(header) < sz)
1076                                 die("Encoding name %s too long", encoding);
1077                         memcpy(buf + offset, header, sz);
1078                         offset += sz;
1079                 }
1080                 if (after_subject) {
1081                         int slen = strlen(after_subject);
1082                         if (slen > space - offset - 1)
1083                                 slen = space - offset - 1;
1084                         memcpy(buf + offset, after_subject, slen);
1085                         offset += slen;
1086                         after_subject = NULL;
1087                 }
1088                 subject = NULL;
1089         }
1090         while (offset && isspace(buf[offset-1]))
1091                 offset--;
1092         /* Make sure there is an EOLN for the non-oneline case */
1093         if (fmt != CMIT_FMT_ONELINE)
1094                 buf[offset++] = '\n';
1095         /*
1096          * make sure there is another EOLN to separate the headers from whatever
1097          * body the caller appends if we haven't already written a body
1098          */
1099         if (fmt == CMIT_FMT_EMAIL && !body)
1100                 buf[offset++] = '\n';
1101         buf[offset] = '\0';
1103         free(reencoded);
1104         return offset;
1107 struct commit *pop_commit(struct commit_list **stack)
1109         struct commit_list *top = *stack;
1110         struct commit *item = top ? top->item : NULL;
1112         if (top) {
1113                 *stack = top->next;
1114                 free(top);
1115         }
1116         return item;
1119 int count_parents(struct commit * commit)
1121         int count;
1122         struct commit_list * parents = commit->parents;
1123         for (count = 0; parents; parents = parents->next,count++)
1124                 ;
1125         return count;
1128 void topo_sort_default_setter(struct commit *c, void *data)
1130         c->util = data;
1133 void *topo_sort_default_getter(struct commit *c)
1135         return c->util;
1138 /*
1139  * Performs an in-place topological sort on the list supplied.
1140  */
1141 void sort_in_topological_order(struct commit_list ** list, int lifo)
1143         sort_in_topological_order_fn(list, lifo, topo_sort_default_setter,
1144                                      topo_sort_default_getter);
1147 void sort_in_topological_order_fn(struct commit_list ** list, int lifo,
1148                                   topo_sort_set_fn_t setter,
1149                                   topo_sort_get_fn_t getter)
1151         struct commit_list * next = *list;
1152         struct commit_list * work = NULL, **insert;
1153         struct commit_list ** pptr = list;
1154         struct sort_node * nodes;
1155         struct sort_node * next_nodes;
1156         int count = 0;
1158         /* determine the size of the list */
1159         while (next) {
1160                 next = next->next;
1161                 count++;
1162         }
1163         
1164         if (!count)
1165                 return;
1166         /* allocate an array to help sort the list */
1167         nodes = xcalloc(count, sizeof(*nodes));
1168         /* link the list to the array */
1169         next_nodes = nodes;
1170         next=*list;
1171         while (next) {
1172                 next_nodes->list_item = next;
1173                 setter(next->item, next_nodes);
1174                 next_nodes++;
1175                 next = next->next;
1176         }
1177         /* update the indegree */
1178         next=*list;
1179         while (next) {
1180                 struct commit_list * parents = next->item->parents;
1181                 while (parents) {
1182                         struct commit * parent=parents->item;
1183                         struct sort_node * pn = (struct sort_node *) getter(parent);
1185                         if (pn)
1186                                 pn->indegree++;
1187                         parents=parents->next;
1188                 }
1189                 next=next->next;
1190         }
1191         /* 
1192          * find the tips
1193          *
1194          * tips are nodes not reachable from any other node in the list 
1195          * 
1196          * the tips serve as a starting set for the work queue.
1197          */
1198         next=*list;
1199         insert = &work;
1200         while (next) {
1201                 struct sort_node * node = (struct sort_node *) getter(next->item);
1203                 if (node->indegree == 0) {
1204                         insert = &commit_list_insert(next->item, insert)->next;
1205                 }
1206                 next=next->next;
1207         }
1209         /* process the list in topological order */
1210         if (!lifo)
1211                 sort_by_date(&work);
1212         while (work) {
1213                 struct commit * work_item = pop_commit(&work);
1214                 struct sort_node * work_node = (struct sort_node *) getter(work_item);
1215                 struct commit_list * parents = work_item->parents;
1217                 while (parents) {
1218                         struct commit * parent=parents->item;
1219                         struct sort_node * pn = (struct sort_node *) getter(parent);
1221                         if (pn) {
1222                                 /*
1223                                  * parents are only enqueued for emission 
1224                                  * when all their children have been emitted thereby
1225                                  * guaranteeing topological order.
1226                                  */
1227                                 pn->indegree--;
1228                                 if (!pn->indegree) {
1229                                         if (!lifo)
1230                                                 insert_by_date(parent, &work);
1231                                         else
1232                                                 commit_list_insert(parent, &work);
1233                                 }
1234                         }
1235                         parents=parents->next;
1236                 }
1237                 /*
1238                  * work_item is a commit all of whose children
1239                  * have already been emitted. we can emit it now.
1240                  */
1241                 *pptr = work_node->list_item;
1242                 pptr = &(*pptr)->next;
1243                 *pptr = NULL;
1244                 setter(work_item, NULL);
1245         }
1246         free(nodes);
1249 /* merge-base stuff */
1251 /* bits #0..15 in revision.h */
1252 #define PARENT1         (1u<<16)
1253 #define PARENT2         (1u<<17)
1254 #define STALE           (1u<<18)
1255 #define RESULT          (1u<<19)
1257 static const unsigned all_flags = (PARENT1 | PARENT2 | STALE | RESULT);
1259 static struct commit *interesting(struct commit_list *list)
1261         while (list) {
1262                 struct commit *commit = list->item;
1263                 list = list->next;
1264                 if (commit->object.flags & STALE)
1265                         continue;
1266                 return commit;
1267         }
1268         return NULL;
1271 static struct commit_list *merge_bases(struct commit *one, struct commit *two)
1273         struct commit_list *list = NULL;
1274         struct commit_list *result = NULL;
1276         if (one == two)
1277                 /* We do not mark this even with RESULT so we do not
1278                  * have to clean it up.
1279                  */
1280                 return commit_list_insert(one, &result);
1282         parse_commit(one);
1283         parse_commit(two);
1285         one->object.flags |= PARENT1;
1286         two->object.flags |= PARENT2;
1287         insert_by_date(one, &list);
1288         insert_by_date(two, &list);
1290         while (interesting(list)) {
1291                 struct commit *commit;
1292                 struct commit_list *parents;
1293                 struct commit_list *n;
1294                 int flags;
1296                 commit = list->item;
1297                 n = list->next;
1298                 free(list);
1299                 list = n;
1301                 flags = commit->object.flags & (PARENT1 | PARENT2 | STALE);
1302                 if (flags == (PARENT1 | PARENT2)) {
1303                         if (!(commit->object.flags & RESULT)) {
1304                                 commit->object.flags |= RESULT;
1305                                 insert_by_date(commit, &result);
1306                         }
1307                         /* Mark parents of a found merge stale */
1308                         flags |= STALE;
1309                 }
1310                 parents = commit->parents;
1311                 while (parents) {
1312                         struct commit *p = parents->item;
1313                         parents = parents->next;
1314                         if ((p->object.flags & flags) == flags)
1315                                 continue;
1316                         parse_commit(p);
1317                         p->object.flags |= flags;
1318                         insert_by_date(p, &list);
1319                 }
1320         }
1322         /* Clean up the result to remove stale ones */
1323         free_commit_list(list);
1324         list = result; result = NULL;
1325         while (list) {
1326                 struct commit_list *n = list->next;
1327                 if (!(list->item->object.flags & STALE))
1328                         insert_by_date(list->item, &result);
1329                 free(list);
1330                 list = n;
1331         }
1332         return result;
1335 struct commit_list *get_merge_bases(struct commit *one,
1336                                     struct commit *two,
1337                                     int cleanup)
1339         struct commit_list *list;
1340         struct commit **rslt;
1341         struct commit_list *result;
1342         int cnt, i, j;
1344         result = merge_bases(one, two);
1345         if (one == two)
1346                 return result;
1347         if (!result || !result->next) {
1348                 if (cleanup) {
1349                         clear_commit_marks(one, all_flags);
1350                         clear_commit_marks(two, all_flags);
1351                 }
1352                 return result;
1353         }
1355         /* There are more than one */
1356         cnt = 0;
1357         list = result;
1358         while (list) {
1359                 list = list->next;
1360                 cnt++;
1361         }
1362         rslt = xcalloc(cnt, sizeof(*rslt));
1363         for (list = result, i = 0; list; list = list->next)
1364                 rslt[i++] = list->item;
1365         free_commit_list(result);
1367         clear_commit_marks(one, all_flags);
1368         clear_commit_marks(two, all_flags);
1369         for (i = 0; i < cnt - 1; i++) {
1370                 for (j = i+1; j < cnt; j++) {
1371                         if (!rslt[i] || !rslt[j])
1372                                 continue;
1373                         result = merge_bases(rslt[i], rslt[j]);
1374                         clear_commit_marks(rslt[i], all_flags);
1375                         clear_commit_marks(rslt[j], all_flags);
1376                         for (list = result; list; list = list->next) {
1377                                 if (rslt[i] == list->item)
1378                                         rslt[i] = NULL;
1379                                 if (rslt[j] == list->item)
1380                                         rslt[j] = NULL;
1381                         }
1382                 }
1383         }
1385         /* Surviving ones in rslt[] are the independent results */
1386         result = NULL;
1387         for (i = 0; i < cnt; i++) {
1388                 if (rslt[i])
1389                         insert_by_date(rslt[i], &result);
1390         }
1391         free(rslt);
1392         return result;
1395 int in_merge_bases(struct commit *commit, struct commit **reference, int num)
1397         struct commit_list *bases, *b;
1398         int ret = 0;
1400         if (num == 1)
1401                 bases = get_merge_bases(commit, *reference, 1);
1402         else
1403                 die("not yet");
1404         for (b = bases; b; b = b->next) {
1405                 if (!hashcmp(commit->object.sha1, b->item->object.sha1)) {
1406                         ret = 1;
1407                         break;
1408                 }
1409         }
1411         free_commit_list(bases);
1412         return ret;