Code

Small correction in reading of commit headers
[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 (eol - line > key_len &&
644                     !strncmp(line, key, key_len) &&
645                     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 void fill_person(struct interp *table, const char *msg, int len)
727         int start, end, tz = 0;
728         unsigned long date;
729         char *ep;
731         /* parse name */
732         for (end = 0; end < len && msg[end] != '<'; end++)
733                 ; /* do nothing */
734         start = end + 1;
735         while (end > 0 && isspace(msg[end - 1]))
736                 end--;
737         table[0].value = xstrndup(msg, end);
739         if (start >= len)
740                 return;
742         /* parse email */
743         for (end = start + 1; end < len && msg[end] != '>'; end++)
744                 ; /* do nothing */
746         if (end >= len)
747                 return;
749         table[1].value = xstrndup(msg + start, end - start);
751         /* parse date */
752         for (start = end + 1; start < len && isspace(msg[start]); start++)
753                 ; /* do nothing */
754         if (start >= len)
755                 return;
756         date = strtoul(msg + start, &ep, 10);
757         if (msg + start == ep)
758                 return;
760         table[5].value = xstrndup(msg + start, ep - (msg + start));
762         /* parse tz */
763         for (start = ep - msg + 1; start < len && isspace(msg[start]); start++)
764                 ; /* do nothing */
765         if (start + 1 < len) {
766                 tz = strtoul(msg + start + 1, NULL, 10);
767                 if (msg[start] == '-')
768                         tz = -tz;
769         }
771         interp_set_entry(table, 2, show_date(date, tz, 0));
772         interp_set_entry(table, 3, show_rfc2822_date(date, tz));
773         interp_set_entry(table, 4, show_date(date, tz, 1));
776 static long format_commit_message(const struct commit *commit,
777                 const char *msg, char *buf, unsigned long space)
779         struct interp table[] = {
780                 { "%H" },       /* commit hash */
781                 { "%h" },       /* abbreviated commit hash */
782                 { "%T" },       /* tree hash */
783                 { "%t" },       /* abbreviated tree hash */
784                 { "%P" },       /* parent hashes */
785                 { "%p" },       /* abbreviated parent hashes */
786                 { "%an" },      /* author name */
787                 { "%ae" },      /* author email */
788                 { "%ad" },      /* author date */
789                 { "%aD" },      /* author date, RFC2822 style */
790                 { "%ar" },      /* author date, relative */
791                 { "%at" },      /* author date, UNIX timestamp */
792                 { "%cn" },      /* committer name */
793                 { "%ce" },      /* committer email */
794                 { "%cd" },      /* committer date */
795                 { "%cD" },      /* committer date, RFC2822 style */
796                 { "%cr" },      /* committer date, relative */
797                 { "%ct" },      /* committer date, UNIX timestamp */
798                 { "%e" },       /* encoding */
799                 { "%s" },       /* subject */
800                 { "%b" },       /* body */
801                 { "%Cred" },    /* red */
802                 { "%Cgreen" },  /* green */
803                 { "%Cblue" },   /* blue */
804                 { "%Creset" },  /* reset color */
805                 { "%n" }        /* newline */
806         };
807         enum interp_index {
808                 IHASH = 0, IHASH_ABBREV,
809                 ITREE, ITREE_ABBREV,
810                 IPARENTS, IPARENTS_ABBREV,
811                 IAUTHOR_NAME, IAUTHOR_EMAIL,
812                 IAUTHOR_DATE, IAUTHOR_DATE_RFC2822, IAUTHOR_DATE_RELATIVE,
813                 IAUTHOR_TIMESTAMP,
814                 ICOMMITTER_NAME, ICOMMITTER_EMAIL,
815                 ICOMMITTER_DATE, ICOMMITTER_DATE_RFC2822,
816                 ICOMMITTER_DATE_RELATIVE, ICOMMITTER_TIMESTAMP,
817                 IENCODING,
818                 ISUBJECT,
819                 IBODY,
820                 IRED, IGREEN, IBLUE, IRESET_COLOR,
821                 INEWLINE
822         };
823         struct commit_list *p;
824         char parents[1024];
825         int i;
826         enum { HEADER, SUBJECT, BODY } state;
828         if (INEWLINE + 1 != ARRAY_SIZE(table))
829                 die("invalid interp table!");
831         /* these are independent of the commit */
832         interp_set_entry(table, IRED, "\033[31m");
833         interp_set_entry(table, IGREEN, "\033[32m");
834         interp_set_entry(table, IBLUE, "\033[34m");
835         interp_set_entry(table, IRESET_COLOR, "\033[m");
836         interp_set_entry(table, INEWLINE, "\n");
838         /* these depend on the commit */
839         if (!commit->object.parsed)
840                 parse_object(commit->object.sha1);
841         interp_set_entry(table, IHASH, sha1_to_hex(commit->object.sha1));
842         interp_set_entry(table, IHASH_ABBREV,
843                         find_unique_abbrev(commit->object.sha1,
844                                 DEFAULT_ABBREV));
845         interp_set_entry(table, ITREE, sha1_to_hex(commit->tree->object.sha1));
846         interp_set_entry(table, ITREE_ABBREV,
847                         find_unique_abbrev(commit->tree->object.sha1,
848                                 DEFAULT_ABBREV));
850         parents[1] = 0;
851         for (i = 0, p = commit->parents;
852                         p && i < sizeof(parents) - 1;
853                         p = p->next)
854                 i += snprintf(parents + i, sizeof(parents) - i - 1, " %s",
855                         sha1_to_hex(p->item->object.sha1));
856         interp_set_entry(table, IPARENTS, parents + 1);
858         parents[1] = 0;
859         for (i = 0, p = commit->parents;
860                         p && i < sizeof(parents) - 1;
861                         p = p->next)
862                 i += snprintf(parents + i, sizeof(parents) - i - 1, " %s",
863                         find_unique_abbrev(p->item->object.sha1,
864                                 DEFAULT_ABBREV));
865         interp_set_entry(table, IPARENTS_ABBREV, parents + 1);
867         for (i = 0, state = HEADER; msg[i] && state < BODY; i++) {
868                 int eol;
869                 for (eol = i; msg[eol] && msg[eol] != '\n'; eol++)
870                         ; /* do nothing */
872                 if (state == SUBJECT) {
873                         table[ISUBJECT].value = xstrndup(msg + i, eol - i);
874                         i = eol;
875                 }
876                 if (i == eol) {
877                         state++;
878                         /* strip empty lines */
879                         while (msg[eol + 1] == '\n')
880                                 eol++;
881                 } else if (!prefixcmp(msg + i, "author "))
882                         fill_person(table + IAUTHOR_NAME,
883                                         msg + i + 7, eol - i - 7);
884                 else if (!prefixcmp(msg + i, "committer "))
885                         fill_person(table + ICOMMITTER_NAME,
886                                         msg + i + 10, eol - i - 10);
887                 else if (!prefixcmp(msg + i, "encoding "))
888                         table[IENCODING].value =
889                                 xstrndup(msg + i + 9, eol - i - 9);
890                 i = eol;
891         }
892         if (msg[i])
893                 table[IBODY].value = xstrdup(msg + i);
894         for (i = 0; i < ARRAY_SIZE(table); i++)
895                 if (!table[i].value)
896                         interp_set_entry(table, i, "<unknown>");
898         interpolate(buf, space, user_format, table, ARRAY_SIZE(table));
899         interp_clear_table(table, ARRAY_SIZE(table));
901         return strlen(buf);
904 unsigned long pretty_print_commit(enum cmit_fmt fmt,
905                                   const struct commit *commit,
906                                   unsigned long len,
907                                   char *buf, unsigned long space,
908                                   int abbrev, const char *subject,
909                                   const char *after_subject,
910                                   int relative_date)
912         int hdr = 1, body = 0, seen_title = 0;
913         unsigned long offset = 0;
914         int indent = 4;
915         int parents_shown = 0;
916         const char *msg = commit->buffer;
917         int plain_non_ascii = 0;
918         char *reencoded;
919         const char *encoding;
921         if (fmt == CMIT_FMT_USERFORMAT)
922                 return format_commit_message(commit, msg, buf, space);
924         encoding = (git_log_output_encoding
925                     ? git_log_output_encoding
926                     : git_commit_encoding);
927         if (!encoding)
928                 encoding = "utf-8";
929         reencoded = logmsg_reencode(commit, encoding);
930         if (reencoded)
931                 msg = reencoded;
933         if (fmt == CMIT_FMT_ONELINE || fmt == CMIT_FMT_EMAIL)
934                 indent = 0;
936         /* After-subject is used to pass in Content-Type: multipart
937          * MIME header; in that case we do not have to do the
938          * plaintext content type even if the commit message has
939          * non 7-bit ASCII character.  Otherwise, check if we need
940          * to say this is not a 7-bit ASCII.
941          */
942         if (fmt == CMIT_FMT_EMAIL && !after_subject) {
943                 int i, ch, in_body;
945                 for (in_body = i = 0; (ch = msg[i]) && i < len; i++) {
946                         if (!in_body) {
947                                 /* author could be non 7-bit ASCII but
948                                  * the log may be so; skip over the
949                                  * header part first.
950                                  */
951                                 if (ch == '\n' &&
952                                     i + 1 < len && msg[i+1] == '\n')
953                                         in_body = 1;
954                         }
955                         else if (non_ascii(ch)) {
956                                 plain_non_ascii = 1;
957                                 break;
958                         }
959                 }
960         }
962         for (;;) {
963                 const char *line = msg;
964                 int linelen = get_one_line(msg, len);
966                 if (!linelen)
967                         break;
969                 /*
970                  * We want some slop for indentation and a possible
971                  * final "...". Thus the "+ 20".
972                  */
973                 if (offset + linelen + 20 > space) {
974                         memcpy(buf + offset, "    ...\n", 8);
975                         offset += 8;
976                         break;
977                 }
979                 msg += linelen;
980                 len -= linelen;
981                 if (hdr) {
982                         if (linelen == 1) {
983                                 hdr = 0;
984                                 if ((fmt != CMIT_FMT_ONELINE) && !subject)
985                                         buf[offset++] = '\n';
986                                 continue;
987                         }
988                         if (fmt == CMIT_FMT_RAW) {
989                                 memcpy(buf + offset, line, linelen);
990                                 offset += linelen;
991                                 continue;
992                         }
993                         if (!memcmp(line, "parent ", 7)) {
994                                 if (linelen != 48)
995                                         die("bad parent line in commit");
996                                 continue;
997                         }
999                         if (!parents_shown) {
1000                                 offset += add_merge_info(fmt, buf + offset,
1001                                                          commit, abbrev);
1002                                 parents_shown = 1;
1003                                 continue;
1004                         }
1005                         /*
1006                          * MEDIUM == DEFAULT shows only author with dates.
1007                          * FULL shows both authors but not dates.
1008                          * FULLER shows both authors and dates.
1009                          */
1010                         if (!memcmp(line, "author ", 7))
1011                                 offset += add_user_info("Author", fmt,
1012                                                         buf + offset,
1013                                                         line + 7,
1014                                                         relative_date,
1015                                                         encoding);
1016                         if (!memcmp(line, "committer ", 10) &&
1017                             (fmt == CMIT_FMT_FULL || fmt == CMIT_FMT_FULLER))
1018                                 offset += add_user_info("Commit", fmt,
1019                                                         buf + offset,
1020                                                         line + 10,
1021                                                         relative_date,
1022                                                         encoding);
1023                         continue;
1024                 }
1026                 if (!subject)
1027                         body = 1;
1029                 if (is_empty_line(line, &linelen)) {
1030                         if (!seen_title)
1031                                 continue;
1032                         if (!body)
1033                                 continue;
1034                         if (subject)
1035                                 continue;
1036                         if (fmt == CMIT_FMT_SHORT)
1037                                 break;
1038                 }
1040                 seen_title = 1;
1041                 if (subject) {
1042                         int slen = strlen(subject);
1043                         memcpy(buf + offset, subject, slen);
1044                         offset += slen;
1045                         offset += add_rfc2047(buf + offset, line, linelen,
1046                                               encoding);
1047                 }
1048                 else {
1049                         memset(buf + offset, ' ', indent);
1050                         memcpy(buf + offset + indent, line, linelen);
1051                         offset += linelen + indent;
1052                 }
1053                 buf[offset++] = '\n';
1054                 if (fmt == CMIT_FMT_ONELINE)
1055                         break;
1056                 if (subject && plain_non_ascii) {
1057                         int sz;
1058                         char header[512];
1059                         const char *header_fmt =
1060                                 "Content-Type: text/plain; charset=%s\n"
1061                                 "Content-Transfer-Encoding: 8bit\n";
1062                         sz = snprintf(header, sizeof(header), header_fmt,
1063                                       encoding);
1064                         if (sizeof(header) < sz)
1065                                 die("Encoding name %s too long", encoding);
1066                         memcpy(buf + offset, header, sz);
1067                         offset += sz;
1068                 }
1069                 if (after_subject) {
1070                         int slen = strlen(after_subject);
1071                         if (slen > space - offset - 1)
1072                                 slen = space - offset - 1;
1073                         memcpy(buf + offset, after_subject, slen);
1074                         offset += slen;
1075                         after_subject = NULL;
1076                 }
1077                 subject = NULL;
1078         }
1079         while (offset && isspace(buf[offset-1]))
1080                 offset--;
1081         /* Make sure there is an EOLN for the non-oneline case */
1082         if (fmt != CMIT_FMT_ONELINE)
1083                 buf[offset++] = '\n';
1084         /*
1085          * make sure there is another EOLN to separate the headers from whatever
1086          * body the caller appends if we haven't already written a body
1087          */
1088         if (fmt == CMIT_FMT_EMAIL && !body)
1089                 buf[offset++] = '\n';
1090         buf[offset] = '\0';
1092         free(reencoded);
1093         return offset;
1096 struct commit *pop_commit(struct commit_list **stack)
1098         struct commit_list *top = *stack;
1099         struct commit *item = top ? top->item : NULL;
1101         if (top) {
1102                 *stack = top->next;
1103                 free(top);
1104         }
1105         return item;
1108 int count_parents(struct commit * commit)
1110         int count;
1111         struct commit_list * parents = commit->parents;
1112         for (count = 0; parents; parents = parents->next,count++)
1113                 ;
1114         return count;
1117 void topo_sort_default_setter(struct commit *c, void *data)
1119         c->util = data;
1122 void *topo_sort_default_getter(struct commit *c)
1124         return c->util;
1127 /*
1128  * Performs an in-place topological sort on the list supplied.
1129  */
1130 void sort_in_topological_order(struct commit_list ** list, int lifo)
1132         sort_in_topological_order_fn(list, lifo, topo_sort_default_setter,
1133                                      topo_sort_default_getter);
1136 void sort_in_topological_order_fn(struct commit_list ** list, int lifo,
1137                                   topo_sort_set_fn_t setter,
1138                                   topo_sort_get_fn_t getter)
1140         struct commit_list * next = *list;
1141         struct commit_list * work = NULL, **insert;
1142         struct commit_list ** pptr = list;
1143         struct sort_node * nodes;
1144         struct sort_node * next_nodes;
1145         int count = 0;
1147         /* determine the size of the list */
1148         while (next) {
1149                 next = next->next;
1150                 count++;
1151         }
1152         
1153         if (!count)
1154                 return;
1155         /* allocate an array to help sort the list */
1156         nodes = xcalloc(count, sizeof(*nodes));
1157         /* link the list to the array */
1158         next_nodes = nodes;
1159         next=*list;
1160         while (next) {
1161                 next_nodes->list_item = next;
1162                 setter(next->item, next_nodes);
1163                 next_nodes++;
1164                 next = next->next;
1165         }
1166         /* update the indegree */
1167         next=*list;
1168         while (next) {
1169                 struct commit_list * parents = next->item->parents;
1170                 while (parents) {
1171                         struct commit * parent=parents->item;
1172                         struct sort_node * pn = (struct sort_node *) getter(parent);
1174                         if (pn)
1175                                 pn->indegree++;
1176                         parents=parents->next;
1177                 }
1178                 next=next->next;
1179         }
1180         /* 
1181          * find the tips
1182          *
1183          * tips are nodes not reachable from any other node in the list 
1184          * 
1185          * the tips serve as a starting set for the work queue.
1186          */
1187         next=*list;
1188         insert = &work;
1189         while (next) {
1190                 struct sort_node * node = (struct sort_node *) getter(next->item);
1192                 if (node->indegree == 0) {
1193                         insert = &commit_list_insert(next->item, insert)->next;
1194                 }
1195                 next=next->next;
1196         }
1198         /* process the list in topological order */
1199         if (!lifo)
1200                 sort_by_date(&work);
1201         while (work) {
1202                 struct commit * work_item = pop_commit(&work);
1203                 struct sort_node * work_node = (struct sort_node *) getter(work_item);
1204                 struct commit_list * parents = work_item->parents;
1206                 while (parents) {
1207                         struct commit * parent=parents->item;
1208                         struct sort_node * pn = (struct sort_node *) getter(parent);
1210                         if (pn) {
1211                                 /*
1212                                  * parents are only enqueued for emission 
1213                                  * when all their children have been emitted thereby
1214                                  * guaranteeing topological order.
1215                                  */
1216                                 pn->indegree--;
1217                                 if (!pn->indegree) {
1218                                         if (!lifo)
1219                                                 insert_by_date(parent, &work);
1220                                         else
1221                                                 commit_list_insert(parent, &work);
1222                                 }
1223                         }
1224                         parents=parents->next;
1225                 }
1226                 /*
1227                  * work_item is a commit all of whose children
1228                  * have already been emitted. we can emit it now.
1229                  */
1230                 *pptr = work_node->list_item;
1231                 pptr = &(*pptr)->next;
1232                 *pptr = NULL;
1233                 setter(work_item, NULL);
1234         }
1235         free(nodes);
1238 /* merge-base stuff */
1240 /* bits #0..15 in revision.h */
1241 #define PARENT1         (1u<<16)
1242 #define PARENT2         (1u<<17)
1243 #define STALE           (1u<<18)
1244 #define RESULT          (1u<<19)
1246 static const unsigned all_flags = (PARENT1 | PARENT2 | STALE | RESULT);
1248 static struct commit *interesting(struct commit_list *list)
1250         while (list) {
1251                 struct commit *commit = list->item;
1252                 list = list->next;
1253                 if (commit->object.flags & STALE)
1254                         continue;
1255                 return commit;
1256         }
1257         return NULL;
1260 static struct commit_list *merge_bases(struct commit *one, struct commit *two)
1262         struct commit_list *list = NULL;
1263         struct commit_list *result = NULL;
1265         if (one == two)
1266                 /* We do not mark this even with RESULT so we do not
1267                  * have to clean it up.
1268                  */
1269                 return commit_list_insert(one, &result);
1271         parse_commit(one);
1272         parse_commit(two);
1274         one->object.flags |= PARENT1;
1275         two->object.flags |= PARENT2;
1276         insert_by_date(one, &list);
1277         insert_by_date(two, &list);
1279         while (interesting(list)) {
1280                 struct commit *commit;
1281                 struct commit_list *parents;
1282                 struct commit_list *n;
1283                 int flags;
1285                 commit = list->item;
1286                 n = list->next;
1287                 free(list);
1288                 list = n;
1290                 flags = commit->object.flags & (PARENT1 | PARENT2 | STALE);
1291                 if (flags == (PARENT1 | PARENT2)) {
1292                         if (!(commit->object.flags & RESULT)) {
1293                                 commit->object.flags |= RESULT;
1294                                 insert_by_date(commit, &result);
1295                         }
1296                         /* Mark parents of a found merge stale */
1297                         flags |= STALE;
1298                 }
1299                 parents = commit->parents;
1300                 while (parents) {
1301                         struct commit *p = parents->item;
1302                         parents = parents->next;
1303                         if ((p->object.flags & flags) == flags)
1304                                 continue;
1305                         parse_commit(p);
1306                         p->object.flags |= flags;
1307                         insert_by_date(p, &list);
1308                 }
1309         }
1311         /* Clean up the result to remove stale ones */
1312         free_commit_list(list);
1313         list = result; result = NULL;
1314         while (list) {
1315                 struct commit_list *n = list->next;
1316                 if (!(list->item->object.flags & STALE))
1317                         insert_by_date(list->item, &result);
1318                 free(list);
1319                 list = n;
1320         }
1321         return result;
1324 struct commit_list *get_merge_bases(struct commit *one,
1325                                     struct commit *two,
1326                                     int cleanup)
1328         struct commit_list *list;
1329         struct commit **rslt;
1330         struct commit_list *result;
1331         int cnt, i, j;
1333         result = merge_bases(one, two);
1334         if (one == two)
1335                 return result;
1336         if (!result || !result->next) {
1337                 if (cleanup) {
1338                         clear_commit_marks(one, all_flags);
1339                         clear_commit_marks(two, all_flags);
1340                 }
1341                 return result;
1342         }
1344         /* There are more than one */
1345         cnt = 0;
1346         list = result;
1347         while (list) {
1348                 list = list->next;
1349                 cnt++;
1350         }
1351         rslt = xcalloc(cnt, sizeof(*rslt));
1352         for (list = result, i = 0; list; list = list->next)
1353                 rslt[i++] = list->item;
1354         free_commit_list(result);
1356         clear_commit_marks(one, all_flags);
1357         clear_commit_marks(two, all_flags);
1358         for (i = 0; i < cnt - 1; i++) {
1359                 for (j = i+1; j < cnt; j++) {
1360                         if (!rslt[i] || !rslt[j])
1361                                 continue;
1362                         result = merge_bases(rslt[i], rslt[j]);
1363                         clear_commit_marks(rslt[i], all_flags);
1364                         clear_commit_marks(rslt[j], all_flags);
1365                         for (list = result; list; list = list->next) {
1366                                 if (rslt[i] == list->item)
1367                                         rslt[i] = NULL;
1368                                 if (rslt[j] == list->item)
1369                                         rslt[j] = NULL;
1370                         }
1371                 }
1372         }
1374         /* Surviving ones in rslt[] are the independent results */
1375         result = NULL;
1376         for (i = 0; i < cnt; i++) {
1377                 if (rslt[i])
1378                         insert_by_date(rslt[i], &result);
1379         }
1380         free(rslt);
1381         return result;
1384 int in_merge_bases(struct commit *commit, struct commit **reference, int num)
1386         struct commit_list *bases, *b;
1387         int ret = 0;
1389         if (num == 1)
1390                 bases = get_merge_bases(commit, *reference, 1);
1391         else
1392                 die("not yet");
1393         for (b = bases; b; b = b->next) {
1394                 if (!hashcmp(commit->object.sha1, b->item->object.sha1)) {
1395                         ret = 1;
1396                         break;
1397                 }
1398         }
1400         free_commit_list(bases);
1401         return ret;