Code

Add --ignore-unmatch option to exit with zero status when no files are removed.
[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                 struct commit *ret = alloc_commit_node();
103                 created_object(sha1, &ret->object);
104                 ret->object.type = OBJ_COMMIT;
105                 return ret;
106         }
107         if (!obj->type)
108                 obj->type = OBJ_COMMIT;
109         return check_commit(obj, sha1, 0);
112 static unsigned long parse_commit_date(const char *buf)
114         unsigned long date;
116         if (memcmp(buf, "author", 6))
117                 return 0;
118         while (*buf++ != '\n')
119                 /* nada */;
120         if (memcmp(buf, "committer", 9))
121                 return 0;
122         while (*buf++ != '>')
123                 /* nada */;
124         date = strtoul(buf, NULL, 10);
125         if (date == ULONG_MAX)
126                 date = 0;
127         return date;
130 static struct commit_graft **commit_graft;
131 static int commit_graft_alloc, commit_graft_nr;
133 static int commit_graft_pos(const unsigned char *sha1)
135         int lo, hi;
136         lo = 0;
137         hi = commit_graft_nr;
138         while (lo < hi) {
139                 int mi = (lo + hi) / 2;
140                 struct commit_graft *graft = commit_graft[mi];
141                 int cmp = hashcmp(sha1, graft->sha1);
142                 if (!cmp)
143                         return mi;
144                 if (cmp < 0)
145                         hi = mi;
146                 else
147                         lo = mi + 1;
148         }
149         return -lo - 1;
152 int register_commit_graft(struct commit_graft *graft, int ignore_dups)
154         int pos = commit_graft_pos(graft->sha1);
155         
156         if (0 <= pos) {
157                 if (ignore_dups)
158                         free(graft);
159                 else {
160                         free(commit_graft[pos]);
161                         commit_graft[pos] = graft;
162                 }
163                 return 1;
164         }
165         pos = -pos - 1;
166         if (commit_graft_alloc <= ++commit_graft_nr) {
167                 commit_graft_alloc = alloc_nr(commit_graft_alloc);
168                 commit_graft = xrealloc(commit_graft,
169                                         sizeof(*commit_graft) *
170                                         commit_graft_alloc);
171         }
172         if (pos < commit_graft_nr)
173                 memmove(commit_graft + pos + 1,
174                         commit_graft + pos,
175                         (commit_graft_nr - pos - 1) *
176                         sizeof(*commit_graft));
177         commit_graft[pos] = graft;
178         return 0;
181 struct commit_graft *read_graft_line(char *buf, int len)
183         /* The format is just "Commit Parent1 Parent2 ...\n" */
184         int i;
185         struct commit_graft *graft = NULL;
187         if (buf[len-1] == '\n')
188                 buf[--len] = 0;
189         if (buf[0] == '#' || buf[0] == '\0')
190                 return NULL;
191         if ((len + 1) % 41) {
192         bad_graft_data:
193                 error("bad graft data: %s", buf);
194                 free(graft);
195                 return NULL;
196         }
197         i = (len + 1) / 41 - 1;
198         graft = xmalloc(sizeof(*graft) + 20 * i);
199         graft->nr_parent = i;
200         if (get_sha1_hex(buf, graft->sha1))
201                 goto bad_graft_data;
202         for (i = 40; i < len; i += 41) {
203                 if (buf[i] != ' ')
204                         goto bad_graft_data;
205                 if (get_sha1_hex(buf + i + 1, graft->parent[i/41]))
206                         goto bad_graft_data;
207         }
208         return graft;
211 int read_graft_file(const char *graft_file)
213         FILE *fp = fopen(graft_file, "r");
214         char buf[1024];
215         if (!fp)
216                 return -1;
217         while (fgets(buf, sizeof(buf), fp)) {
218                 /* The format is just "Commit Parent1 Parent2 ...\n" */
219                 int len = strlen(buf);
220                 struct commit_graft *graft = read_graft_line(buf, len);
221                 if (!graft)
222                         continue;
223                 if (register_commit_graft(graft, 1))
224                         error("duplicate graft data: %s", buf);
225         }
226         fclose(fp);
227         return 0;
230 static void prepare_commit_graft(void)
232         static int commit_graft_prepared;
233         char *graft_file;
235         if (commit_graft_prepared)
236                 return;
237         graft_file = get_graft_file();
238         read_graft_file(graft_file);
239         /* make sure shallows are read */
240         is_repository_shallow();
241         commit_graft_prepared = 1;
244 static struct commit_graft *lookup_commit_graft(const unsigned char *sha1)
246         int pos;
247         prepare_commit_graft();
248         pos = commit_graft_pos(sha1);
249         if (pos < 0)
250                 return NULL;
251         return commit_graft[pos];
254 int write_shallow_commits(int fd, int use_pack_protocol)
256         int i, count = 0;
257         for (i = 0; i < commit_graft_nr; i++)
258                 if (commit_graft[i]->nr_parent < 0) {
259                         const char *hex =
260                                 sha1_to_hex(commit_graft[i]->sha1);
261                         count++;
262                         if (use_pack_protocol)
263                                 packet_write(fd, "shallow %s", hex);
264                         else {
265                                 if (write_in_full(fd, hex,  40) != 40)
266                                         break;
267                                 if (write_in_full(fd, "\n", 1) != 1)
268                                         break;
269                         }
270                 }
271         return count;
274 int unregister_shallow(const unsigned char *sha1)
276         int pos = commit_graft_pos(sha1);
277         if (pos < 0)
278                 return -1;
279         if (pos + 1 < commit_graft_nr)
280                 memcpy(commit_graft + pos, commit_graft + pos + 1,
281                                 sizeof(struct commit_graft *)
282                                 * (commit_graft_nr - pos - 1));
283         commit_graft_nr--;
284         return 0;
287 int parse_commit_buffer(struct commit *item, void *buffer, unsigned long size)
289         char *tail = buffer;
290         char *bufptr = buffer;
291         unsigned char parent[20];
292         struct commit_list **pptr;
293         struct commit_graft *graft;
294         unsigned n_refs = 0;
296         if (item->object.parsed)
297                 return 0;
298         item->object.parsed = 1;
299         tail += size;
300         if (tail <= bufptr + 5 || memcmp(bufptr, "tree ", 5))
301                 return error("bogus commit object %s", sha1_to_hex(item->object.sha1));
302         if (tail <= bufptr + 45 || get_sha1_hex(bufptr + 5, parent) < 0)
303                 return error("bad tree pointer in commit %s",
304                              sha1_to_hex(item->object.sha1));
305         item->tree = lookup_tree(parent);
306         if (item->tree)
307                 n_refs++;
308         bufptr += 46; /* "tree " + "hex sha1" + "\n" */
309         pptr = &item->parents;
311         graft = lookup_commit_graft(item->object.sha1);
312         while (bufptr + 48 < tail && !memcmp(bufptr, "parent ", 7)) {
313                 struct commit *new_parent;
315                 if (tail <= bufptr + 48 ||
316                     get_sha1_hex(bufptr + 7, parent) ||
317                     bufptr[47] != '\n')
318                         return error("bad parents in commit %s", sha1_to_hex(item->object.sha1));
319                 bufptr += 48;
320                 if (graft)
321                         continue;
322                 new_parent = lookup_commit(parent);
323                 if (new_parent) {
324                         pptr = &commit_list_insert(new_parent, pptr)->next;
325                         n_refs++;
326                 }
327         }
328         if (graft) {
329                 int i;
330                 struct commit *new_parent;
331                 for (i = 0; i < graft->nr_parent; i++) {
332                         new_parent = lookup_commit(graft->parent[i]);
333                         if (!new_parent)
334                                 continue;
335                         pptr = &commit_list_insert(new_parent, pptr)->next;
336                         n_refs++;
337                 }
338         }
339         item->date = parse_commit_date(bufptr);
341         if (track_object_refs) {
342                 unsigned i = 0;
343                 struct commit_list *p;
344                 struct object_refs *refs = alloc_object_refs(n_refs);
345                 if (item->tree)
346                         refs->ref[i++] = &item->tree->object;
347                 for (p = item->parents; p; p = p->next)
348                         refs->ref[i++] = &p->item->object;
349                 set_object_refs(&item->object, refs);
350         }
352         return 0;
355 int parse_commit(struct commit *item)
357         enum object_type type;
358         void *buffer;
359         unsigned long size;
360         int ret;
362         if (item->object.parsed)
363                 return 0;
364         buffer = read_sha1_file(item->object.sha1, &type, &size);
365         if (!buffer)
366                 return error("Could not read %s",
367                              sha1_to_hex(item->object.sha1));
368         if (type != OBJ_COMMIT) {
369                 free(buffer);
370                 return error("Object %s not a commit",
371                              sha1_to_hex(item->object.sha1));
372         }
373         ret = parse_commit_buffer(item, buffer, size);
374         if (save_commit_buffer && !ret) {
375                 item->buffer = buffer;
376                 return 0;
377         }
378         free(buffer);
379         return ret;
382 struct commit_list *commit_list_insert(struct commit *item, struct commit_list **list_p)
384         struct commit_list *new_list = xmalloc(sizeof(struct commit_list));
385         new_list->item = item;
386         new_list->next = *list_p;
387         *list_p = new_list;
388         return new_list;
391 void free_commit_list(struct commit_list *list)
393         while (list) {
394                 struct commit_list *temp = list;
395                 list = temp->next;
396                 free(temp);
397         }
400 struct commit_list * insert_by_date(struct commit *item, struct commit_list **list)
402         struct commit_list **pp = list;
403         struct commit_list *p;
404         while ((p = *pp) != NULL) {
405                 if (p->item->date < item->date) {
406                         break;
407                 }
408                 pp = &p->next;
409         }
410         return commit_list_insert(item, pp);
413         
414 void sort_by_date(struct commit_list **list)
416         struct commit_list *ret = NULL;
417         while (*list) {
418                 insert_by_date((*list)->item, &ret);
419                 *list = (*list)->next;
420         }
421         *list = ret;
424 struct commit *pop_most_recent_commit(struct commit_list **list,
425                                       unsigned int mark)
427         struct commit *ret = (*list)->item;
428         struct commit_list *parents = ret->parents;
429         struct commit_list *old = *list;
431         *list = (*list)->next;
432         free(old);
434         while (parents) {
435                 struct commit *commit = parents->item;
436                 parse_commit(commit);
437                 if (!(commit->object.flags & mark)) {
438                         commit->object.flags |= mark;
439                         insert_by_date(commit, list);
440                 }
441                 parents = parents->next;
442         }
443         return ret;
446 void clear_commit_marks(struct commit *commit, unsigned int mark)
448         struct commit_list *parents;
450         commit->object.flags &= ~mark;
451         parents = commit->parents;
452         while (parents) {
453                 struct commit *parent = parents->item;
455                 /* Have we already cleared this? */
456                 if (mark & parent->object.flags)
457                         clear_commit_marks(parent, mark);
458                 parents = parents->next;
459         }
462 /*
463  * Generic support for pretty-printing the header
464  */
465 static int get_one_line(const char *msg, unsigned long len)
467         int ret = 0;
469         while (len--) {
470                 char c = *msg++;
471                 if (!c)
472                         break;
473                 ret++;
474                 if (c == '\n')
475                         break;
476         }
477         return ret;
480 /* High bit set, or ISO-2022-INT */
481 static int non_ascii(int ch)
483         ch = (ch & 0xff);
484         return ((ch & 0x80) || (ch == 0x1b));
487 static int is_rfc2047_special(char ch)
489         return (non_ascii(ch) || (ch == '=') || (ch == '?') || (ch == '_'));
492 static int add_rfc2047(char *buf, const char *line, int len,
493                        const char *encoding)
495         char *bp = buf;
496         int i, needquote;
497         char q_encoding[128];
498         const char *q_encoding_fmt = "=?%s?q?";
500         for (i = needquote = 0; !needquote && i < len; i++) {
501                 int ch = line[i];
502                 if (non_ascii(ch))
503                         needquote++;
504                 if ((i + 1 < len) &&
505                     (ch == '=' && line[i+1] == '?'))
506                         needquote++;
507         }
508         if (!needquote)
509                 return sprintf(buf, "%.*s", len, line);
511         i = snprintf(q_encoding, sizeof(q_encoding), q_encoding_fmt, encoding);
512         if (sizeof(q_encoding) < i)
513                 die("Insanely long encoding name %s", encoding);
514         memcpy(bp, q_encoding, i);
515         bp += i;
516         for (i = 0; i < len; i++) {
517                 unsigned ch = line[i] & 0xFF;
518                 if (is_rfc2047_special(ch)) {
519                         sprintf(bp, "=%02X", ch);
520                         bp += 3;
521                 }
522                 else if (ch == ' ')
523                         *bp++ = '_';
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, int relative_date,
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, relative_date));
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, relative_date));
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 (!strncmp(line, key, key_len) && line[key_len] == ' ') {
646                         int len = eol - line - key_len;
647                         char *ret = xmalloc(len);
648                         memcpy(ret, line + key_len + 1, len - 1);
649                         ret[len - 1] = '\0';
650                         return ret;
651                 }
652                 line = next;
653         }
656 static char *replace_encoding_header(char *buf, const char *encoding)
658         char *encoding_header = strstr(buf, "\nencoding ");
659         char *header_end = strstr(buf, "\n\n");
660         char *end_of_encoding_header;
661         int encoding_header_pos;
662         int encoding_header_len;
663         int new_len;
664         int need_len;
665         int buflen = strlen(buf) + 1;
667         if (!header_end)
668                 header_end = buf + buflen;
669         if (!encoding_header || encoding_header >= header_end)
670                 return buf;
671         encoding_header++;
672         end_of_encoding_header = strchr(encoding_header, '\n');
673         if (!end_of_encoding_header)
674                 return buf; /* should not happen but be defensive */
675         end_of_encoding_header++;
677         encoding_header_len = end_of_encoding_header - encoding_header;
678         encoding_header_pos = encoding_header - buf;
680         if (is_encoding_utf8(encoding)) {
681                 /* we have re-coded to UTF-8; drop the header */
682                 memmove(encoding_header, end_of_encoding_header,
683                         buflen - (encoding_header_pos + encoding_header_len));
684                 return buf;
685         }
686         new_len = strlen(encoding);
687         need_len = new_len + strlen("encoding \n");
688         if (encoding_header_len < need_len) {
689                 buf = xrealloc(buf, buflen + (need_len - encoding_header_len));
690                 encoding_header = buf + encoding_header_pos;
691                 end_of_encoding_header = encoding_header + encoding_header_len;
692         }
693         memmove(end_of_encoding_header + (need_len - encoding_header_len),
694                 end_of_encoding_header,
695                 buflen - (encoding_header_pos + encoding_header_len));
696         memcpy(encoding_header + 9, encoding, strlen(encoding));
697         encoding_header[9 + new_len] = '\n';
698         return buf;
701 static char *logmsg_reencode(const struct commit *commit,
702                              const char *output_encoding)
704         static const char *utf8 = "utf-8";
705         const char *use_encoding;
706         char *encoding;
707         char *out;
709         if (!*output_encoding)
710                 return NULL;
711         encoding = get_header(commit, "encoding");
712         use_encoding = encoding ? encoding : utf8;
713         if (!strcmp(use_encoding, output_encoding))
714                 out = xstrdup(commit->buffer);
715         else
716                 out = reencode_string(commit->buffer,
717                                       output_encoding, use_encoding);
718         if (out)
719                 out = replace_encoding_header(out, output_encoding);
721         free(encoding);
722         return out;
725 static char *xstrndup(const char *text, int len)
727         char *result = xmalloc(len + 1);
728         memcpy(result, text, len);
729         result[len] = '\0';
730         return result;
733 static void fill_person(struct interp *table, const char *msg, int len)
735         int start, end, tz = 0;
736         unsigned long date;
737         char *ep;
739         /* parse name */
740         for (end = 0; end < len && msg[end] != '<'; end++)
741                 ; /* do nothing */
742         start = end + 1;
743         while (end > 0 && isspace(msg[end - 1]))
744                 end--;
745         table[0].value = xstrndup(msg, end);
747         if (start >= len)
748                 return;
750         /* parse email */
751         for (end = start + 1; end < len && msg[end] != '>'; end++)
752                 ; /* do nothing */
754         if (end >= len)
755                 return;
757         table[1].value = xstrndup(msg + start, end - start);
759         /* parse date */
760         for (start = end + 1; start < len && isspace(msg[start]); start++)
761                 ; /* do nothing */
762         if (start >= len)
763                 return;
764         date = strtoul(msg + start, &ep, 10);
765         if (msg + start == ep)
766                 return;
768         table[5].value = xstrndup(msg + start, ep - (msg + start));
770         /* parse tz */
771         for (start = ep - msg + 1; start < len && isspace(msg[start]); start++)
772                 ; /* do nothing */
773         if (start + 1 < len) {
774                 tz = strtoul(msg + start + 1, NULL, 10);
775                 if (msg[start] == '-')
776                         tz = -tz;
777         }
779         interp_set_entry(table, 2, show_date(date, tz, 0));
780         interp_set_entry(table, 3, show_rfc2822_date(date, tz));
781         interp_set_entry(table, 4, show_date(date, tz, 1));
784 static long format_commit_message(const struct commit *commit,
785                 const char *msg, char *buf, unsigned long space)
787         struct interp table[] = {
788                 { "%H" },       /* commit hash */
789                 { "%h" },       /* abbreviated commit hash */
790                 { "%T" },       /* tree hash */
791                 { "%t" },       /* abbreviated tree hash */
792                 { "%P" },       /* parent hashes */
793                 { "%p" },       /* abbreviated parent hashes */
794                 { "%an" },      /* author name */
795                 { "%ae" },      /* author email */
796                 { "%ad" },      /* author date */
797                 { "%aD" },      /* author date, RFC2822 style */
798                 { "%ar" },      /* author date, relative */
799                 { "%at" },      /* author date, UNIX timestamp */
800                 { "%cn" },      /* committer name */
801                 { "%ce" },      /* committer email */
802                 { "%cd" },      /* committer date */
803                 { "%cD" },      /* committer date, RFC2822 style */
804                 { "%cr" },      /* committer date, relative */
805                 { "%ct" },      /* committer date, UNIX timestamp */
806                 { "%e" },       /* encoding */
807                 { "%s" },       /* subject */
808                 { "%b" },       /* body */
809                 { "%Cred" },    /* red */
810                 { "%Cgreen" },  /* green */
811                 { "%Cblue" },   /* blue */
812                 { "%Creset" },  /* reset color */
813                 { "%n" },       /* newline */
814                 { "%m" },       /* left/right/bottom */
815         };
816         enum interp_index {
817                 IHASH = 0, IHASH_ABBREV,
818                 ITREE, ITREE_ABBREV,
819                 IPARENTS, IPARENTS_ABBREV,
820                 IAUTHOR_NAME, IAUTHOR_EMAIL,
821                 IAUTHOR_DATE, IAUTHOR_DATE_RFC2822, IAUTHOR_DATE_RELATIVE,
822                 IAUTHOR_TIMESTAMP,
823                 ICOMMITTER_NAME, ICOMMITTER_EMAIL,
824                 ICOMMITTER_DATE, ICOMMITTER_DATE_RFC2822,
825                 ICOMMITTER_DATE_RELATIVE, ICOMMITTER_TIMESTAMP,
826                 IENCODING,
827                 ISUBJECT,
828                 IBODY,
829                 IRED, IGREEN, IBLUE, IRESET_COLOR,
830                 INEWLINE,
831                 ILEFT_RIGHT,
832         };
833         struct commit_list *p;
834         char parents[1024];
835         int i;
836         enum { HEADER, SUBJECT, BODY } state;
838         if (ILEFT_RIGHT + 1 != ARRAY_SIZE(table))
839                 die("invalid interp table!");
841         /* these are independent of the commit */
842         interp_set_entry(table, IRED, "\033[31m");
843         interp_set_entry(table, IGREEN, "\033[32m");
844         interp_set_entry(table, IBLUE, "\033[34m");
845         interp_set_entry(table, IRESET_COLOR, "\033[m");
846         interp_set_entry(table, INEWLINE, "\n");
848         /* these depend on the commit */
849         if (!commit->object.parsed)
850                 parse_object(commit->object.sha1);
851         interp_set_entry(table, IHASH, sha1_to_hex(commit->object.sha1));
852         interp_set_entry(table, IHASH_ABBREV,
853                         find_unique_abbrev(commit->object.sha1,
854                                 DEFAULT_ABBREV));
855         interp_set_entry(table, ITREE, sha1_to_hex(commit->tree->object.sha1));
856         interp_set_entry(table, ITREE_ABBREV,
857                         find_unique_abbrev(commit->tree->object.sha1,
858                                 DEFAULT_ABBREV));
859         interp_set_entry(table, ILEFT_RIGHT,
860                          (commit->object.flags & BOUNDARY)
861                          ? "-"
862                          : (commit->object.flags & SYMMETRIC_LEFT)
863                          ? "<"
864                          : ">");
866         parents[1] = 0;
867         for (i = 0, p = commit->parents;
868                         p && i < sizeof(parents) - 1;
869                         p = p->next)
870                 i += snprintf(parents + i, sizeof(parents) - i - 1, " %s",
871                         sha1_to_hex(p->item->object.sha1));
872         interp_set_entry(table, IPARENTS, parents + 1);
874         parents[1] = 0;
875         for (i = 0, p = commit->parents;
876                         p && i < sizeof(parents) - 1;
877                         p = p->next)
878                 i += snprintf(parents + i, sizeof(parents) - i - 1, " %s",
879                         find_unique_abbrev(p->item->object.sha1,
880                                 DEFAULT_ABBREV));
881         interp_set_entry(table, IPARENTS_ABBREV, parents + 1);
883         for (i = 0, state = HEADER; msg[i] && state < BODY; i++) {
884                 int eol;
885                 for (eol = i; msg[eol] && msg[eol] != '\n'; eol++)
886                         ; /* do nothing */
888                 if (state == SUBJECT) {
889                         table[ISUBJECT].value = xstrndup(msg + i, eol - i);
890                         i = eol;
891                 }
892                 if (i == eol) {
893                         state++;
894                         /* strip empty lines */
895                         while (msg[eol + 1] == '\n')
896                                 eol++;
897                 } else if (!prefixcmp(msg + i, "author "))
898                         fill_person(table + IAUTHOR_NAME,
899                                         msg + i + 7, eol - i - 7);
900                 else if (!prefixcmp(msg + i, "committer "))
901                         fill_person(table + ICOMMITTER_NAME,
902                                         msg + i + 10, eol - i - 10);
903                 else if (!prefixcmp(msg + i, "encoding "))
904                         table[IENCODING].value =
905                                 xstrndup(msg + i + 9, eol - i - 9);
906                 i = eol;
907         }
908         if (msg[i])
909                 table[IBODY].value = xstrdup(msg + i);
910         for (i = 0; i < ARRAY_SIZE(table); i++)
911                 if (!table[i].value)
912                         interp_set_entry(table, i, "<unknown>");
914         interpolate(buf, space, user_format, table, ARRAY_SIZE(table));
915         interp_clear_table(table, ARRAY_SIZE(table));
917         return strlen(buf);
920 unsigned long pretty_print_commit(enum cmit_fmt fmt,
921                                   const struct commit *commit,
922                                   unsigned long len,
923                                   char *buf, unsigned long space,
924                                   int abbrev, const char *subject,
925                                   const char *after_subject,
926                                   int relative_date)
928         int hdr = 1, body = 0, seen_title = 0;
929         unsigned long offset = 0;
930         int indent = 4;
931         int parents_shown = 0;
932         const char *msg = commit->buffer;
933         int plain_non_ascii = 0;
934         char *reencoded;
935         const char *encoding;
937         if (fmt == CMIT_FMT_USERFORMAT)
938                 return format_commit_message(commit, msg, buf, space);
940         encoding = (git_log_output_encoding
941                     ? git_log_output_encoding
942                     : git_commit_encoding);
943         if (!encoding)
944                 encoding = "utf-8";
945         reencoded = logmsg_reencode(commit, encoding);
946         if (reencoded)
947                 msg = reencoded;
949         if (fmt == CMIT_FMT_ONELINE || fmt == CMIT_FMT_EMAIL)
950                 indent = 0;
952         /* After-subject is used to pass in Content-Type: multipart
953          * MIME header; in that case we do not have to do the
954          * plaintext content type even if the commit message has
955          * non 7-bit ASCII character.  Otherwise, check if we need
956          * to say this is not a 7-bit ASCII.
957          */
958         if (fmt == CMIT_FMT_EMAIL && !after_subject) {
959                 int i, ch, in_body;
961                 for (in_body = i = 0; (ch = msg[i]) && i < len; i++) {
962                         if (!in_body) {
963                                 /* author could be non 7-bit ASCII but
964                                  * the log may be so; skip over the
965                                  * header part first.
966                                  */
967                                 if (ch == '\n' &&
968                                     i + 1 < len && msg[i+1] == '\n')
969                                         in_body = 1;
970                         }
971                         else if (non_ascii(ch)) {
972                                 plain_non_ascii = 1;
973                                 break;
974                         }
975                 }
976         }
978         for (;;) {
979                 const char *line = msg;
980                 int linelen = get_one_line(msg, len);
982                 if (!linelen)
983                         break;
985                 /*
986                  * We want some slop for indentation and a possible
987                  * final "...". Thus the "+ 20".
988                  */
989                 if (offset + linelen + 20 > space) {
990                         memcpy(buf + offset, "    ...\n", 8);
991                         offset += 8;
992                         break;
993                 }
995                 msg += linelen;
996                 len -= linelen;
997                 if (hdr) {
998                         if (linelen == 1) {
999                                 hdr = 0;
1000                                 if ((fmt != CMIT_FMT_ONELINE) && !subject)
1001                                         buf[offset++] = '\n';
1002                                 continue;
1003                         }
1004                         if (fmt == CMIT_FMT_RAW) {
1005                                 memcpy(buf + offset, line, linelen);
1006                                 offset += linelen;
1007                                 continue;
1008                         }
1009                         if (!memcmp(line, "parent ", 7)) {
1010                                 if (linelen != 48)
1011                                         die("bad parent line in commit");
1012                                 continue;
1013                         }
1015                         if (!parents_shown) {
1016                                 offset += add_merge_info(fmt, buf + offset,
1017                                                          commit, abbrev);
1018                                 parents_shown = 1;
1019                                 continue;
1020                         }
1021                         /*
1022                          * MEDIUM == DEFAULT shows only author with dates.
1023                          * FULL shows both authors but not dates.
1024                          * FULLER shows both authors and dates.
1025                          */
1026                         if (!memcmp(line, "author ", 7))
1027                                 offset += add_user_info("Author", fmt,
1028                                                         buf + offset,
1029                                                         line + 7,
1030                                                         relative_date,
1031                                                         encoding);
1032                         if (!memcmp(line, "committer ", 10) &&
1033                             (fmt == CMIT_FMT_FULL || fmt == CMIT_FMT_FULLER))
1034                                 offset += add_user_info("Commit", fmt,
1035                                                         buf + offset,
1036                                                         line + 10,
1037                                                         relative_date,
1038                                                         encoding);
1039                         continue;
1040                 }
1042                 if (!subject)
1043                         body = 1;
1045                 if (is_empty_line(line, &linelen)) {
1046                         if (!seen_title)
1047                                 continue;
1048                         if (!body)
1049                                 continue;
1050                         if (subject)
1051                                 continue;
1052                         if (fmt == CMIT_FMT_SHORT)
1053                                 break;
1054                 }
1056                 seen_title = 1;
1057                 if (subject) {
1058                         int slen = strlen(subject);
1059                         memcpy(buf + offset, subject, slen);
1060                         offset += slen;
1061                         offset += add_rfc2047(buf + offset, line, linelen,
1062                                               encoding);
1063                 }
1064                 else {
1065                         memset(buf + offset, ' ', indent);
1066                         memcpy(buf + offset + indent, line, linelen);
1067                         offset += linelen + indent;
1068                 }
1069                 buf[offset++] = '\n';
1070                 if (fmt == CMIT_FMT_ONELINE)
1071                         break;
1072                 if (subject && plain_non_ascii) {
1073                         int sz;
1074                         char header[512];
1075                         const char *header_fmt =
1076                                 "Content-Type: text/plain; charset=%s\n"
1077                                 "Content-Transfer-Encoding: 8bit\n";
1078                         sz = snprintf(header, sizeof(header), header_fmt,
1079                                       encoding);
1080                         if (sizeof(header) < sz)
1081                                 die("Encoding name %s too long", encoding);
1082                         memcpy(buf + offset, header, sz);
1083                         offset += sz;
1084                 }
1085                 if (after_subject) {
1086                         int slen = strlen(after_subject);
1087                         if (slen > space - offset - 1)
1088                                 slen = space - offset - 1;
1089                         memcpy(buf + offset, after_subject, slen);
1090                         offset += slen;
1091                         after_subject = NULL;
1092                 }
1093                 subject = NULL;
1094         }
1095         while (offset && isspace(buf[offset-1]))
1096                 offset--;
1097         /* Make sure there is an EOLN for the non-oneline case */
1098         if (fmt != CMIT_FMT_ONELINE)
1099                 buf[offset++] = '\n';
1100         /*
1101          * make sure there is another EOLN to separate the headers from whatever
1102          * body the caller appends if we haven't already written a body
1103          */
1104         if (fmt == CMIT_FMT_EMAIL && !body)
1105                 buf[offset++] = '\n';
1106         buf[offset] = '\0';
1108         free(reencoded);
1109         return offset;
1112 struct commit *pop_commit(struct commit_list **stack)
1114         struct commit_list *top = *stack;
1115         struct commit *item = top ? top->item : NULL;
1117         if (top) {
1118                 *stack = top->next;
1119                 free(top);
1120         }
1121         return item;
1124 int count_parents(struct commit * commit)
1126         int count;
1127         struct commit_list * parents = commit->parents;
1128         for (count = 0; parents; parents = parents->next,count++)
1129                 ;
1130         return count;
1133 void topo_sort_default_setter(struct commit *c, void *data)
1135         c->util = data;
1138 void *topo_sort_default_getter(struct commit *c)
1140         return c->util;
1143 /*
1144  * Performs an in-place topological sort on the list supplied.
1145  */
1146 void sort_in_topological_order(struct commit_list ** list, int lifo)
1148         sort_in_topological_order_fn(list, lifo, topo_sort_default_setter,
1149                                      topo_sort_default_getter);
1152 void sort_in_topological_order_fn(struct commit_list ** list, int lifo,
1153                                   topo_sort_set_fn_t setter,
1154                                   topo_sort_get_fn_t getter)
1156         struct commit_list * next = *list;
1157         struct commit_list * work = NULL, **insert;
1158         struct commit_list ** pptr = list;
1159         struct sort_node * nodes;
1160         struct sort_node * next_nodes;
1161         int count = 0;
1163         /* determine the size of the list */
1164         while (next) {
1165                 next = next->next;
1166                 count++;
1167         }
1168         
1169         if (!count)
1170                 return;
1171         /* allocate an array to help sort the list */
1172         nodes = xcalloc(count, sizeof(*nodes));
1173         /* link the list to the array */
1174         next_nodes = nodes;
1175         next=*list;
1176         while (next) {
1177                 next_nodes->list_item = next;
1178                 setter(next->item, next_nodes);
1179                 next_nodes++;
1180                 next = next->next;
1181         }
1182         /* update the indegree */
1183         next=*list;
1184         while (next) {
1185                 struct commit_list * parents = next->item->parents;
1186                 while (parents) {
1187                         struct commit * parent=parents->item;
1188                         struct sort_node * pn = (struct sort_node *) getter(parent);
1190                         if (pn)
1191                                 pn->indegree++;
1192                         parents=parents->next;
1193                 }
1194                 next=next->next;
1195         }
1196         /* 
1197          * find the tips
1198          *
1199          * tips are nodes not reachable from any other node in the list 
1200          * 
1201          * the tips serve as a starting set for the work queue.
1202          */
1203         next=*list;
1204         insert = &work;
1205         while (next) {
1206                 struct sort_node * node = (struct sort_node *) getter(next->item);
1208                 if (node->indegree == 0) {
1209                         insert = &commit_list_insert(next->item, insert)->next;
1210                 }
1211                 next=next->next;
1212         }
1214         /* process the list in topological order */
1215         if (!lifo)
1216                 sort_by_date(&work);
1217         while (work) {
1218                 struct commit * work_item = pop_commit(&work);
1219                 struct sort_node * work_node = (struct sort_node *) getter(work_item);
1220                 struct commit_list * parents = work_item->parents;
1222                 while (parents) {
1223                         struct commit * parent=parents->item;
1224                         struct sort_node * pn = (struct sort_node *) getter(parent);
1226                         if (pn) {
1227                                 /*
1228                                  * parents are only enqueued for emission 
1229                                  * when all their children have been emitted thereby
1230                                  * guaranteeing topological order.
1231                                  */
1232                                 pn->indegree--;
1233                                 if (!pn->indegree) {
1234                                         if (!lifo)
1235                                                 insert_by_date(parent, &work);
1236                                         else
1237                                                 commit_list_insert(parent, &work);
1238                                 }
1239                         }
1240                         parents=parents->next;
1241                 }
1242                 /*
1243                  * work_item is a commit all of whose children
1244                  * have already been emitted. we can emit it now.
1245                  */
1246                 *pptr = work_node->list_item;
1247                 pptr = &(*pptr)->next;
1248                 *pptr = NULL;
1249                 setter(work_item, NULL);
1250         }
1251         free(nodes);
1254 /* merge-base stuff */
1256 /* bits #0..15 in revision.h */
1257 #define PARENT1         (1u<<16)
1258 #define PARENT2         (1u<<17)
1259 #define STALE           (1u<<18)
1260 #define RESULT          (1u<<19)
1262 static const unsigned all_flags = (PARENT1 | PARENT2 | STALE | RESULT);
1264 static struct commit *interesting(struct commit_list *list)
1266         while (list) {
1267                 struct commit *commit = list->item;
1268                 list = list->next;
1269                 if (commit->object.flags & STALE)
1270                         continue;
1271                 return commit;
1272         }
1273         return NULL;
1276 static struct commit_list *merge_bases(struct commit *one, struct commit *two)
1278         struct commit_list *list = NULL;
1279         struct commit_list *result = NULL;
1281         if (one == two)
1282                 /* We do not mark this even with RESULT so we do not
1283                  * have to clean it up.
1284                  */
1285                 return commit_list_insert(one, &result);
1287         parse_commit(one);
1288         parse_commit(two);
1290         one->object.flags |= PARENT1;
1291         two->object.flags |= PARENT2;
1292         insert_by_date(one, &list);
1293         insert_by_date(two, &list);
1295         while (interesting(list)) {
1296                 struct commit *commit;
1297                 struct commit_list *parents;
1298                 struct commit_list *n;
1299                 int flags;
1301                 commit = list->item;
1302                 n = list->next;
1303                 free(list);
1304                 list = n;
1306                 flags = commit->object.flags & (PARENT1 | PARENT2 | STALE);
1307                 if (flags == (PARENT1 | PARENT2)) {
1308                         if (!(commit->object.flags & RESULT)) {
1309                                 commit->object.flags |= RESULT;
1310                                 insert_by_date(commit, &result);
1311                         }
1312                         /* Mark parents of a found merge stale */
1313                         flags |= STALE;
1314                 }
1315                 parents = commit->parents;
1316                 while (parents) {
1317                         struct commit *p = parents->item;
1318                         parents = parents->next;
1319                         if ((p->object.flags & flags) == flags)
1320                                 continue;
1321                         parse_commit(p);
1322                         p->object.flags |= flags;
1323                         insert_by_date(p, &list);
1324                 }
1325         }
1327         /* Clean up the result to remove stale ones */
1328         free_commit_list(list);
1329         list = result; result = NULL;
1330         while (list) {
1331                 struct commit_list *n = list->next;
1332                 if (!(list->item->object.flags & STALE))
1333                         insert_by_date(list->item, &result);
1334                 free(list);
1335                 list = n;
1336         }
1337         return result;
1340 struct commit_list *get_merge_bases(struct commit *one,
1341                                     struct commit *two,
1342                                     int cleanup)
1344         struct commit_list *list;
1345         struct commit **rslt;
1346         struct commit_list *result;
1347         int cnt, i, j;
1349         result = merge_bases(one, two);
1350         if (one == two)
1351                 return result;
1352         if (!result || !result->next) {
1353                 if (cleanup) {
1354                         clear_commit_marks(one, all_flags);
1355                         clear_commit_marks(two, all_flags);
1356                 }
1357                 return result;
1358         }
1360         /* There are more than one */
1361         cnt = 0;
1362         list = result;
1363         while (list) {
1364                 list = list->next;
1365                 cnt++;
1366         }
1367         rslt = xcalloc(cnt, sizeof(*rslt));
1368         for (list = result, i = 0; list; list = list->next)
1369                 rslt[i++] = list->item;
1370         free_commit_list(result);
1372         clear_commit_marks(one, all_flags);
1373         clear_commit_marks(two, all_flags);
1374         for (i = 0; i < cnt - 1; i++) {
1375                 for (j = i+1; j < cnt; j++) {
1376                         if (!rslt[i] || !rslt[j])
1377                                 continue;
1378                         result = merge_bases(rslt[i], rslt[j]);
1379                         clear_commit_marks(rslt[i], all_flags);
1380                         clear_commit_marks(rslt[j], all_flags);
1381                         for (list = result; list; list = list->next) {
1382                                 if (rslt[i] == list->item)
1383                                         rslt[i] = NULL;
1384                                 if (rslt[j] == list->item)
1385                                         rslt[j] = NULL;
1386                         }
1387                 }
1388         }
1390         /* Surviving ones in rslt[] are the independent results */
1391         result = NULL;
1392         for (i = 0; i < cnt; i++) {
1393                 if (rslt[i])
1394                         insert_by_date(rslt[i], &result);
1395         }
1396         free(rslt);
1397         return result;
1400 int in_merge_bases(struct commit *commit, struct commit **reference, int num)
1402         struct commit_list *bases, *b;
1403         int ret = 0;
1405         if (num == 1)
1406                 bases = get_merge_bases(commit, *reference, 1);
1407         else
1408                 die("not yet");
1409         for (b = bases; b; b = b->next) {
1410                 if (!hashcmp(commit->object.sha1, b->item->object.sha1)) {
1411                         ret = 1;
1412                         break;
1413                 }
1414         }
1416         free_commit_list(bases);
1417         return ret;