Code

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