Merge git://repo.or.cz/git-gui
[git] / builtin-log.c
1 /*
2  * Builtin "git log" and related commands (show, whatchanged)
3  *
4  * (C) Copyright 2006 Linus Torvalds
5  *               2006 Junio Hamano
6  */
7 #include "cache.h"
8 #include "commit.h"
9 #include "diff.h"
10 #include "revision.h"
11 #include "log-tree.h"
12 #include "builtin.h"
13 #include "tag.h"
14 #include "reflog-walk.h"
15 #include "patch-ids.h"
16 #include "refs.h"
17
18 static int default_show_root = 1;
19 static const char *fmt_patch_subject_prefix = "PATCH";
20
21 static void add_name_decoration(const char *prefix, const char *name, struct object *obj)
22 {
23         int plen = strlen(prefix);
24         int nlen = strlen(name);
25         struct name_decoration *res = xmalloc(sizeof(struct name_decoration) + plen + nlen);
26         memcpy(res->name, prefix, plen);
27         memcpy(res->name + plen, name, nlen + 1);
28         res->next = add_decoration(&name_decoration, obj, res);
29 }
30
31 static int add_ref_decoration(const char *refname, const unsigned char *sha1, int flags, void *cb_data)
32 {
33         struct object *obj = parse_object(sha1);
34         if (!obj)
35                 return 0;
36         add_name_decoration("", refname, obj);
37         while (obj->type == OBJ_TAG) {
38                 obj = ((struct tag *)obj)->tagged;
39                 if (!obj)
40                         break;
41                 add_name_decoration("tag: ", refname, obj);
42         }
43         return 0;
44 }
45
46 static void cmd_log_init(int argc, const char **argv, const char *prefix,
47                       struct rev_info *rev)
48 {
49         int i;
50         int decorate = 0;
51
52         rev->abbrev = DEFAULT_ABBREV;
53         rev->commit_format = CMIT_FMT_DEFAULT;
54         rev->verbose_header = 1;
55         DIFF_OPT_SET(&rev->diffopt, RECURSIVE);
56         rev->show_root_diff = default_show_root;
57         rev->subject_prefix = fmt_patch_subject_prefix;
58         argc = setup_revisions(argc, argv, rev, "HEAD");
59         if (rev->diffopt.pickaxe || rev->diffopt.filter)
60                 rev->always_show_header = 0;
61         if (DIFF_OPT_TST(&rev->diffopt, FOLLOW_RENAMES)) {
62                 rev->always_show_header = 0;
63                 if (rev->diffopt.nr_paths != 1)
64                         usage("git logs can only follow renames on one pathname at a time");
65         }
66         for (i = 1; i < argc; i++) {
67                 const char *arg = argv[i];
68                 if (!strcmp(arg, "--decorate")) {
69                         if (!decorate)
70                                 for_each_ref(add_ref_decoration, NULL);
71                         decorate = 1;
72                 } else
73                         die("unrecognized argument: %s", arg);
74         }
75 }
76
77 /*
78  * This gives a rough estimate for how many commits we
79  * will print out in the list.
80  */
81 static int estimate_commit_count(struct rev_info *rev, struct commit_list *list)
82 {
83         int n = 0;
84
85         while (list) {
86                 struct commit *commit = list->item;
87                 unsigned int flags = commit->object.flags;
88                 list = list->next;
89                 if (!(flags & (TREESAME | UNINTERESTING)))
90                         n++;
91         }
92         return n;
93 }
94
95 static void show_early_header(struct rev_info *rev, const char *stage, int nr)
96 {
97         if (rev->shown_one) {
98                 rev->shown_one = 0;
99                 if (rev->commit_format != CMIT_FMT_ONELINE)
100                         putchar(rev->diffopt.line_termination);
101         }
102         printf("Final output: %d %s\n", nr, stage);
103 }
104
105 struct itimerval early_output_timer;
106
107 static void log_show_early(struct rev_info *revs, struct commit_list *list)
108 {
109         int i = revs->early_output;
110         int show_header = 1;
111
112         sort_in_topological_order(&list, revs->lifo);
113         while (list && i) {
114                 struct commit *commit = list->item;
115                 switch (simplify_commit(revs, commit)) {
116                 case commit_show:
117                         if (show_header) {
118                                 int n = estimate_commit_count(revs, list);
119                                 show_early_header(revs, "incomplete", n);
120                                 show_header = 0;
121                         }
122                         log_tree_commit(revs, commit);
123                         i--;
124                         break;
125                 case commit_ignore:
126                         break;
127                 case commit_error:
128                         return;
129                 }
130                 list = list->next;
131         }
132
133         /* Did we already get enough commits for the early output? */
134         if (!i)
135                 return;
136
137         /*
138          * ..if no, then repeat it twice a second until we
139          * do.
140          *
141          * NOTE! We don't use "it_interval", because if the
142          * reader isn't listening, we want our output to be
143          * throttled by the writing, and not have the timer
144          * trigger every second even if we're blocked on a
145          * reader!
146          */
147         early_output_timer.it_value.tv_sec = 0;
148         early_output_timer.it_value.tv_usec = 500000;
149         setitimer(ITIMER_REAL, &early_output_timer, NULL);
150 }
151
152 static void early_output(int signal)
153 {
154         show_early_output = log_show_early;
155 }
156
157 static void setup_early_output(struct rev_info *rev)
158 {
159         struct sigaction sa;
160
161         /*
162          * Set up the signal handler, minimally intrusively:
163          * we only set a single volatile integer word (not
164          * using sigatomic_t - trying to avoid unnecessary
165          * system dependencies and headers), and using
166          * SA_RESTART.
167          */
168         memset(&sa, 0, sizeof(sa));
169         sa.sa_handler = early_output;
170         sigemptyset(&sa.sa_mask);
171         sa.sa_flags = SA_RESTART;
172         sigaction(SIGALRM, &sa, NULL);
173
174         /*
175          * If we can get the whole output in less than a
176          * tenth of a second, don't even bother doing the
177          * early-output thing..
178          *
179          * This is a one-time-only trigger.
180          */
181         early_output_timer.it_value.tv_sec = 0;
182         early_output_timer.it_value.tv_usec = 100000;
183         setitimer(ITIMER_REAL, &early_output_timer, NULL);
184 }
185
186 static void finish_early_output(struct rev_info *rev)
187 {
188         int n = estimate_commit_count(rev, rev->commits);
189         signal(SIGALRM, SIG_IGN);
190         show_early_header(rev, "done", n);
191 }
192
193 static int cmd_log_walk(struct rev_info *rev)
194 {
195         struct commit *commit;
196
197         if (rev->early_output)
198                 setup_early_output(rev);
199
200         prepare_revision_walk(rev);
201
202         if (rev->early_output)
203                 finish_early_output(rev);
204
205         while ((commit = get_revision(rev)) != NULL) {
206                 log_tree_commit(rev, commit);
207                 if (!rev->reflog_info) {
208                         /* we allow cycles in reflog ancestry */
209                         free(commit->buffer);
210                         commit->buffer = NULL;
211                 }
212                 free_commit_list(commit->parents);
213                 commit->parents = NULL;
214         }
215         return 0;
216 }
217
218 static int git_log_config(const char *var, const char *value)
219 {
220         if (!strcmp(var, "format.subjectprefix")) {
221                 if (!value)
222                         die("format.subjectprefix without value");
223                 fmt_patch_subject_prefix = xstrdup(value);
224                 return 0;
225         }
226         if (!strcmp(var, "log.showroot")) {
227                 default_show_root = git_config_bool(var, value);
228                 return 0;
229         }
230         return git_diff_ui_config(var, value);
231 }
232
233 int cmd_whatchanged(int argc, const char **argv, const char *prefix)
234 {
235         struct rev_info rev;
236
237         git_config(git_log_config);
238         init_revisions(&rev, prefix);
239         rev.diff = 1;
240         rev.simplify_history = 0;
241         cmd_log_init(argc, argv, prefix, &rev);
242         if (!rev.diffopt.output_format)
243                 rev.diffopt.output_format = DIFF_FORMAT_RAW;
244         return cmd_log_walk(&rev);
245 }
246
247 static void show_tagger(char *buf, int len, struct rev_info *rev)
248 {
249         char *email_end, *p;
250         unsigned long date;
251         int tz;
252
253         email_end = memchr(buf, '>', len);
254         if (!email_end)
255                 return;
256         p = ++email_end;
257         while (isspace(*p))
258                 p++;
259         date = strtoul(p, &p, 10);
260         while (isspace(*p))
261                 p++;
262         tz = (int)strtol(p, NULL, 10);
263         printf("Tagger: %.*s\nDate:   %s\n", (int)(email_end - buf), buf,
264                show_date(date, tz, rev->date_mode));
265 }
266
267 static int show_object(const unsigned char *sha1, int show_tag_object,
268         struct rev_info *rev)
269 {
270         unsigned long size;
271         enum object_type type;
272         char *buf = read_sha1_file(sha1, &type, &size);
273         int offset = 0;
274
275         if (!buf)
276                 return error("Could not read object %s", sha1_to_hex(sha1));
277
278         if (show_tag_object)
279                 while (offset < size && buf[offset] != '\n') {
280                         int new_offset = offset + 1;
281                         while (new_offset < size && buf[new_offset++] != '\n')
282                                 ; /* do nothing */
283                         if (!prefixcmp(buf + offset, "tagger "))
284                                 show_tagger(buf + offset + 7,
285                                             new_offset - offset - 7, rev);
286                         offset = new_offset;
287                 }
288
289         if (offset < size)
290                 fwrite(buf + offset, size - offset, 1, stdout);
291         free(buf);
292         return 0;
293 }
294
295 static int show_tree_object(const unsigned char *sha1,
296                 const char *base, int baselen,
297                 const char *pathname, unsigned mode, int stage)
298 {
299         printf("%s%s\n", pathname, S_ISDIR(mode) ? "/" : "");
300         return 0;
301 }
302
303 int cmd_show(int argc, const char **argv, const char *prefix)
304 {
305         struct rev_info rev;
306         struct object_array_entry *objects;
307         int i, count, ret = 0;
308
309         git_config(git_log_config);
310         init_revisions(&rev, prefix);
311         rev.diff = 1;
312         rev.combine_merges = 1;
313         rev.dense_combined_merges = 1;
314         rev.always_show_header = 1;
315         rev.ignore_merges = 0;
316         rev.no_walk = 1;
317         cmd_log_init(argc, argv, prefix, &rev);
318
319         count = rev.pending.nr;
320         objects = rev.pending.objects;
321         for (i = 0; i < count && !ret; i++) {
322                 struct object *o = objects[i].item;
323                 const char *name = objects[i].name;
324                 switch (o->type) {
325                 case OBJ_BLOB:
326                         ret = show_object(o->sha1, 0, NULL);
327                         break;
328                 case OBJ_TAG: {
329                         struct tag *t = (struct tag *)o;
330
331                         printf("%stag %s%s\n",
332                                         diff_get_color_opt(&rev.diffopt, DIFF_COMMIT),
333                                         t->tag,
334                                         diff_get_color_opt(&rev.diffopt, DIFF_RESET));
335                         ret = show_object(o->sha1, 1, &rev);
336                         objects[i].item = (struct object *)t->tagged;
337                         i--;
338                         break;
339                 }
340                 case OBJ_TREE:
341                         printf("%stree %s%s\n\n",
342                                         diff_get_color_opt(&rev.diffopt, DIFF_COMMIT),
343                                         name,
344                                         diff_get_color_opt(&rev.diffopt, DIFF_RESET));
345                         read_tree_recursive((struct tree *)o, "", 0, 0, NULL,
346                                         show_tree_object);
347                         break;
348                 case OBJ_COMMIT:
349                         rev.pending.nr = rev.pending.alloc = 0;
350                         rev.pending.objects = NULL;
351                         add_object_array(o, name, &rev.pending);
352                         ret = cmd_log_walk(&rev);
353                         break;
354                 default:
355                         ret = error("Unknown type: %d", o->type);
356                 }
357         }
358         free(objects);
359         return ret;
360 }
361
362 /*
363  * This is equivalent to "git log -g --abbrev-commit --pretty=oneline"
364  */
365 int cmd_log_reflog(int argc, const char **argv, const char *prefix)
366 {
367         struct rev_info rev;
368
369         git_config(git_log_config);
370         init_revisions(&rev, prefix);
371         init_reflog_walk(&rev.reflog_info);
372         rev.abbrev_commit = 1;
373         rev.verbose_header = 1;
374         cmd_log_init(argc, argv, prefix, &rev);
375
376         /*
377          * This means that we override whatever commit format the user gave
378          * on the cmd line.  Sad, but cmd_log_init() currently doesn't
379          * allow us to set a different default.
380          */
381         rev.commit_format = CMIT_FMT_ONELINE;
382         rev.always_show_header = 1;
383
384         /*
385          * We get called through "git reflog", so unlike the other log
386          * routines, we need to set up our pager manually..
387          */
388         setup_pager();
389
390         return cmd_log_walk(&rev);
391 }
392
393 int cmd_log(int argc, const char **argv, const char *prefix)
394 {
395         struct rev_info rev;
396
397         git_config(git_log_config);
398         init_revisions(&rev, prefix);
399         rev.always_show_header = 1;
400         cmd_log_init(argc, argv, prefix, &rev);
401         return cmd_log_walk(&rev);
402 }
403
404 /* format-patch */
405 #define FORMAT_PATCH_NAME_MAX 64
406
407 static int istitlechar(char c)
408 {
409         return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') ||
410                 (c >= '0' && c <= '9') || c == '.' || c == '_';
411 }
412
413 static char *extra_headers = NULL;
414 static int extra_headers_size = 0;
415 static const char *fmt_patch_suffix = ".patch";
416 static int numbered = 0;
417 static int auto_number = 0;
418
419 static int git_format_config(const char *var, const char *value)
420 {
421         if (!strcmp(var, "format.headers")) {
422                 int len;
423
424                 if (!value)
425                         die("format.headers without value");
426                 len = strlen(value);
427                 extra_headers_size += len + 1;
428                 extra_headers = xrealloc(extra_headers, extra_headers_size);
429                 extra_headers[extra_headers_size - len - 1] = 0;
430                 strcat(extra_headers, value);
431                 return 0;
432         }
433         if (!strcmp(var, "format.suffix")) {
434                 if (!value)
435                         die("format.suffix without value");
436                 fmt_patch_suffix = xstrdup(value);
437                 return 0;
438         }
439         if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
440                 return 0;
441         }
442         if (!strcmp(var, "format.numbered")) {
443                 if (!strcasecmp(value, "auto")) {
444                         auto_number = 1;
445                         return 0;
446                 }
447
448                 numbered = git_config_bool(var, value);
449                 return 0;
450         }
451
452         return git_log_config(var, value);
453 }
454
455
456 static FILE *realstdout = NULL;
457 static const char *output_directory = NULL;
458
459 static int reopen_stdout(struct commit *commit, int nr, int keep_subject,
460                          int numbered_files)
461 {
462         char filename[PATH_MAX];
463         char *sol;
464         int len = 0;
465         int suffix_len = strlen(fmt_patch_suffix) + 1;
466
467         if (output_directory) {
468                 if (strlen(output_directory) >=
469                     sizeof(filename) - FORMAT_PATCH_NAME_MAX - suffix_len)
470                         return error("name of output directory is too long");
471                 strlcpy(filename, output_directory, sizeof(filename) - suffix_len);
472                 len = strlen(filename);
473                 if (filename[len - 1] != '/')
474                         filename[len++] = '/';
475         }
476
477         if (numbered_files) {
478                 sprintf(filename + len, "%d", nr);
479                 len = strlen(filename);
480
481         } else {
482                 sprintf(filename + len, "%04d", nr);
483                 len = strlen(filename);
484
485                 sol = strstr(commit->buffer, "\n\n");
486                 if (sol) {
487                         int j, space = 1;
488
489                         sol += 2;
490                         /* strip [PATCH] or [PATCH blabla] */
491                         if (!keep_subject && !prefixcmp(sol, "[PATCH")) {
492                                 char *eos = strchr(sol + 6, ']');
493                                 if (eos) {
494                                         while (isspace(*eos))
495                                                 eos++;
496                                         sol = eos;
497                                 }
498                         }
499
500                         for (j = 0;
501                              j < FORMAT_PATCH_NAME_MAX - suffix_len - 5 &&
502                                      len < sizeof(filename) - suffix_len &&
503                                      sol[j] && sol[j] != '\n';
504                              j++) {
505                                 if (istitlechar(sol[j])) {
506                                         if (space) {
507                                                 filename[len++] = '-';
508                                                 space = 0;
509                                         }
510                                         filename[len++] = sol[j];
511                                         if (sol[j] == '.')
512                                                 while (sol[j + 1] == '.')
513                                                         j++;
514                                 } else
515                                         space = 1;
516                         }
517                         while (filename[len - 1] == '.'
518                                || filename[len - 1] == '-')
519                                 len--;
520                         filename[len] = 0;
521                 }
522                 if (len + suffix_len >= sizeof(filename))
523                         return error("Patch pathname too long");
524                 strcpy(filename + len, fmt_patch_suffix);
525         }
526
527         fprintf(realstdout, "%s\n", filename);
528         if (freopen(filename, "w", stdout) == NULL)
529                 return error("Cannot open patch file %s",filename);
530
531         return 0;
532 }
533
534 static void get_patch_ids(struct rev_info *rev, struct patch_ids *ids, const char *prefix)
535 {
536         struct rev_info check_rev;
537         struct commit *commit;
538         struct object *o1, *o2;
539         unsigned flags1, flags2;
540
541         if (rev->pending.nr != 2)
542                 die("Need exactly one range.");
543
544         o1 = rev->pending.objects[0].item;
545         flags1 = o1->flags;
546         o2 = rev->pending.objects[1].item;
547         flags2 = o2->flags;
548
549         if ((flags1 & UNINTERESTING) == (flags2 & UNINTERESTING))
550                 die("Not a range.");
551
552         init_patch_ids(ids);
553
554         /* given a range a..b get all patch ids for b..a */
555         init_revisions(&check_rev, prefix);
556         o1->flags ^= UNINTERESTING;
557         o2->flags ^= UNINTERESTING;
558         add_pending_object(&check_rev, o1, "o1");
559         add_pending_object(&check_rev, o2, "o2");
560         prepare_revision_walk(&check_rev);
561
562         while ((commit = get_revision(&check_rev)) != NULL) {
563                 /* ignore merges */
564                 if (commit->parents && commit->parents->next)
565                         continue;
566
567                 add_commit_patch_id(commit, ids);
568         }
569
570         /* reset for next revision walk */
571         clear_commit_marks((struct commit *)o1,
572                         SEEN | UNINTERESTING | SHOWN | ADDED);
573         clear_commit_marks((struct commit *)o2,
574                         SEEN | UNINTERESTING | SHOWN | ADDED);
575         o1->flags = flags1;
576         o2->flags = flags2;
577 }
578
579 static void gen_message_id(char *dest, unsigned int length, char *base)
580 {
581         const char *committer = git_committer_info(IDENT_WARN_ON_NO_NAME);
582         const char *email_start = strrchr(committer, '<');
583         const char *email_end = strrchr(committer, '>');
584         if(!email_start || !email_end || email_start > email_end - 1)
585                 die("Could not extract email from committer identity.");
586         snprintf(dest, length, "%s.%lu.git.%.*s", base,
587                  (unsigned long) time(NULL),
588                  (int)(email_end - email_start - 1), email_start + 1);
589 }
590
591 static const char *clean_message_id(const char *msg_id)
592 {
593         char ch;
594         const char *a, *z, *m;
595
596         m = msg_id;
597         while ((ch = *m) && (isspace(ch) || (ch == '<')))
598                 m++;
599         a = m;
600         z = NULL;
601         while ((ch = *m)) {
602                 if (!isspace(ch) && (ch != '>'))
603                         z = m;
604                 m++;
605         }
606         if (!z)
607                 die("insane in-reply-to: %s", msg_id);
608         if (++z == m)
609                 return a;
610         return xmemdupz(a, z - a);
611 }
612
613 int cmd_format_patch(int argc, const char **argv, const char *prefix)
614 {
615         struct commit *commit;
616         struct commit **list = NULL;
617         struct rev_info rev;
618         int nr = 0, total, i, j;
619         int use_stdout = 0;
620         int start_number = -1;
621         int keep_subject = 0;
622         int numbered_files = 0;         /* _just_ numbers */
623         int subject_prefix = 0;
624         int ignore_if_in_upstream = 0;
625         int thread = 0;
626         const char *in_reply_to = NULL;
627         struct patch_ids ids;
628         char *add_signoff = NULL;
629         char message_id[1024];
630         char ref_message_id[1024];
631
632         git_config(git_format_config);
633         init_revisions(&rev, prefix);
634         rev.commit_format = CMIT_FMT_EMAIL;
635         rev.verbose_header = 1;
636         rev.diff = 1;
637         rev.combine_merges = 0;
638         rev.ignore_merges = 1;
639         rev.diffopt.msg_sep = "";
640         DIFF_OPT_SET(&rev.diffopt, RECURSIVE);
641
642         rev.subject_prefix = fmt_patch_subject_prefix;
643         rev.extra_headers = extra_headers;
644
645         /*
646          * Parse the arguments before setup_revisions(), or something
647          * like "git format-patch -o a123 HEAD^.." may fail; a123 is
648          * possibly a valid SHA1.
649          */
650         for (i = 1, j = 1; i < argc; i++) {
651                 if (!strcmp(argv[i], "--stdout"))
652                         use_stdout = 1;
653                 else if (!strcmp(argv[i], "-n") ||
654                                 !strcmp(argv[i], "--numbered"))
655                         numbered = 1;
656                 else if (!strcmp(argv[i], "-N") ||
657                                 !strcmp(argv[i], "--no-numbered")) {
658                         numbered = 0;
659                         auto_number = 0;
660                 }
661                 else if (!prefixcmp(argv[i], "--start-number="))
662                         start_number = strtol(argv[i] + 15, NULL, 10);
663                 else if (!strcmp(argv[i], "--numbered-files"))
664                         numbered_files = 1;
665                 else if (!strcmp(argv[i], "--start-number")) {
666                         i++;
667                         if (i == argc)
668                                 die("Need a number for --start-number");
669                         start_number = strtol(argv[i], NULL, 10);
670                 }
671                 else if (!strcmp(argv[i], "-k") ||
672                                 !strcmp(argv[i], "--keep-subject")) {
673                         keep_subject = 1;
674                         rev.total = -1;
675                 }
676                 else if (!strcmp(argv[i], "--output-directory") ||
677                          !strcmp(argv[i], "-o")) {
678                         i++;
679                         if (argc <= i)
680                                 die("Which directory?");
681                         if (output_directory)
682                                 die("Two output directories?");
683                         output_directory = argv[i];
684                 }
685                 else if (!strcmp(argv[i], "--signoff") ||
686                          !strcmp(argv[i], "-s")) {
687                         const char *committer;
688                         const char *endpos;
689                         committer = git_committer_info(IDENT_ERROR_ON_NO_NAME);
690                         endpos = strchr(committer, '>');
691                         if (!endpos)
692                                 die("bogos committer info %s\n", committer);
693                         add_signoff = xmemdupz(committer, endpos - committer + 1);
694                 }
695                 else if (!strcmp(argv[i], "--attach")) {
696                         rev.mime_boundary = git_version_string;
697                         rev.no_inline = 1;
698                 }
699                 else if (!prefixcmp(argv[i], "--attach=")) {
700                         rev.mime_boundary = argv[i] + 9;
701                         rev.no_inline = 1;
702                 }
703                 else if (!strcmp(argv[i], "--inline")) {
704                         rev.mime_boundary = git_version_string;
705                         rev.no_inline = 0;
706                 }
707                 else if (!prefixcmp(argv[i], "--inline=")) {
708                         rev.mime_boundary = argv[i] + 9;
709                         rev.no_inline = 0;
710                 }
711                 else if (!strcmp(argv[i], "--ignore-if-in-upstream"))
712                         ignore_if_in_upstream = 1;
713                 else if (!strcmp(argv[i], "--thread"))
714                         thread = 1;
715                 else if (!prefixcmp(argv[i], "--in-reply-to="))
716                         in_reply_to = argv[i] + 14;
717                 else if (!strcmp(argv[i], "--in-reply-to")) {
718                         i++;
719                         if (i == argc)
720                                 die("Need a Message-Id for --in-reply-to");
721                         in_reply_to = argv[i];
722                 } else if (!prefixcmp(argv[i], "--subject-prefix=")) {
723                         subject_prefix = 1;
724                         rev.subject_prefix = argv[i] + 17;
725                 } else if (!prefixcmp(argv[i], "--suffix="))
726                         fmt_patch_suffix = argv[i] + 9;
727                 else
728                         argv[j++] = argv[i];
729         }
730         argc = j;
731
732         if (start_number < 0)
733                 start_number = 1;
734         if (numbered && keep_subject)
735                 die ("-n and -k are mutually exclusive.");
736         if (keep_subject && subject_prefix)
737                 die ("--subject-prefix and -k are mutually exclusive.");
738         if (numbered_files && use_stdout)
739                 die ("--numbered-files and --stdout are mutually exclusive.");
740
741         argc = setup_revisions(argc, argv, &rev, "HEAD");
742         if (argc > 1)
743                 die ("unrecognized argument: %s", argv[1]);
744
745         if (!rev.diffopt.output_format)
746                 rev.diffopt.output_format = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_SUMMARY | DIFF_FORMAT_PATCH;
747
748         if (!DIFF_OPT_TST(&rev.diffopt, TEXT))
749                 DIFF_OPT_SET(&rev.diffopt, BINARY);
750
751         if (!output_directory && !use_stdout)
752                 output_directory = prefix;
753
754         if (output_directory) {
755                 if (use_stdout)
756                         die("standard output, or directory, which one?");
757                 if (mkdir(output_directory, 0777) < 0 && errno != EEXIST)
758                         die("Could not create directory %s",
759                             output_directory);
760         }
761
762         if (rev.pending.nr == 1) {
763                 if (rev.max_count < 0 && !rev.show_root_diff) {
764                         /*
765                          * This is traditional behaviour of "git format-patch
766                          * origin" that prepares what the origin side still
767                          * does not have.
768                          */
769                         rev.pending.objects[0].item->flags |= UNINTERESTING;
770                         add_head_to_pending(&rev);
771                 }
772                 /*
773                  * Otherwise, it is "format-patch -22 HEAD", and/or
774                  * "format-patch --root HEAD".  The user wants
775                  * get_revision() to do the usual traversal.
776                  */
777         }
778
779         if (ignore_if_in_upstream)
780                 get_patch_ids(&rev, &ids, prefix);
781
782         if (!use_stdout)
783                 realstdout = xfdopen(xdup(1), "w");
784
785         prepare_revision_walk(&rev);
786         while ((commit = get_revision(&rev)) != NULL) {
787                 /* ignore merges */
788                 if (commit->parents && commit->parents->next)
789                         continue;
790
791                 if (ignore_if_in_upstream &&
792                                 has_commit_patch_id(commit, &ids))
793                         continue;
794
795                 nr++;
796                 list = xrealloc(list, nr * sizeof(list[0]));
797                 list[nr - 1] = commit;
798         }
799         total = nr;
800         if (!keep_subject && auto_number && total > 1)
801                 numbered = 1;
802         if (numbered)
803                 rev.total = total + start_number - 1;
804         rev.add_signoff = add_signoff;
805         if (in_reply_to)
806                 rev.ref_message_id = clean_message_id(in_reply_to);
807         while (0 <= --nr) {
808                 int shown;
809                 commit = list[nr];
810                 rev.nr = total - nr + (start_number - 1);
811                 /* Make the second and subsequent mails replies to the first */
812                 if (thread) {
813                         if (nr == (total - 2)) {
814                                 strncpy(ref_message_id, message_id,
815                                         sizeof(ref_message_id));
816                                 ref_message_id[sizeof(ref_message_id)-1]='\0';
817                                 rev.ref_message_id = ref_message_id;
818                         }
819                         gen_message_id(message_id, sizeof(message_id),
820                                        sha1_to_hex(commit->object.sha1));
821                         rev.message_id = message_id;
822                 }
823                 if (!use_stdout)
824                         if (reopen_stdout(commit, rev.nr, keep_subject,
825                                           numbered_files))
826                                 die("Failed to create output files");
827                 shown = log_tree_commit(&rev, commit);
828                 free(commit->buffer);
829                 commit->buffer = NULL;
830
831                 /* We put one extra blank line between formatted
832                  * patches and this flag is used by log-tree code
833                  * to see if it needs to emit a LF before showing
834                  * the log; when using one file per patch, we do
835                  * not want the extra blank line.
836                  */
837                 if (!use_stdout)
838                         rev.shown_one = 0;
839                 if (shown) {
840                         if (rev.mime_boundary)
841                                 printf("\n--%s%s--\n\n\n",
842                                        mime_boundary_leader,
843                                        rev.mime_boundary);
844                         else
845                                 printf("-- \n%s\n\n", git_version_string);
846                 }
847                 if (!use_stdout)
848                         fclose(stdout);
849         }
850         free(list);
851         if (ignore_if_in_upstream)
852                 free_patch_ids(&ids);
853         return 0;
854 }
855
856 static int add_pending_commit(const char *arg, struct rev_info *revs, int flags)
857 {
858         unsigned char sha1[20];
859         if (get_sha1(arg, sha1) == 0) {
860                 struct commit *commit = lookup_commit_reference(sha1);
861                 if (commit) {
862                         commit->object.flags |= flags;
863                         add_pending_object(revs, &commit->object, arg);
864                         return 0;
865                 }
866         }
867         return -1;
868 }
869
870 static const char cherry_usage[] =
871 "git-cherry [-v] <upstream> [<head>] [<limit>]";
872 int cmd_cherry(int argc, const char **argv, const char *prefix)
873 {
874         struct rev_info revs;
875         struct patch_ids ids;
876         struct commit *commit;
877         struct commit_list *list = NULL;
878         const char *upstream;
879         const char *head = "HEAD";
880         const char *limit = NULL;
881         int verbose = 0;
882
883         if (argc > 1 && !strcmp(argv[1], "-v")) {
884                 verbose = 1;
885                 argc--;
886                 argv++;
887         }
888
889         switch (argc) {
890         case 4:
891                 limit = argv[3];
892                 /* FALLTHROUGH */
893         case 3:
894                 head = argv[2];
895                 /* FALLTHROUGH */
896         case 2:
897                 upstream = argv[1];
898                 break;
899         default:
900                 usage(cherry_usage);
901         }
902
903         init_revisions(&revs, prefix);
904         revs.diff = 1;
905         revs.combine_merges = 0;
906         revs.ignore_merges = 1;
907         DIFF_OPT_SET(&revs.diffopt, RECURSIVE);
908
909         if (add_pending_commit(head, &revs, 0))
910                 die("Unknown commit %s", head);
911         if (add_pending_commit(upstream, &revs, UNINTERESTING))
912                 die("Unknown commit %s", upstream);
913
914         /* Don't say anything if head and upstream are the same. */
915         if (revs.pending.nr == 2) {
916                 struct object_array_entry *o = revs.pending.objects;
917                 if (hashcmp(o[0].item->sha1, o[1].item->sha1) == 0)
918                         return 0;
919         }
920
921         get_patch_ids(&revs, &ids, prefix);
922
923         if (limit && add_pending_commit(limit, &revs, UNINTERESTING))
924                 die("Unknown commit %s", limit);
925
926         /* reverse the list of commits */
927         prepare_revision_walk(&revs);
928         while ((commit = get_revision(&revs)) != NULL) {
929                 /* ignore merges */
930                 if (commit->parents && commit->parents->next)
931                         continue;
932
933                 commit_list_insert(commit, &list);
934         }
935
936         while (list) {
937                 char sign = '+';
938
939                 commit = list->item;
940                 if (has_commit_patch_id(commit, &ids))
941                         sign = '-';
942
943                 if (verbose) {
944                         struct strbuf buf;
945                         strbuf_init(&buf, 0);
946                         pretty_print_commit(CMIT_FMT_ONELINE, commit,
947                                             &buf, 0, NULL, NULL, 0, 0);
948                         printf("%c %s %s\n", sign,
949                                sha1_to_hex(commit->object.sha1), buf.buf);
950                         strbuf_release(&buf);
951                 }
952                 else {
953                         printf("%c %s\n", sign,
954                                sha1_to_hex(commit->object.sha1));
955                 }
956
957                 list = list->next;
958         }
959
960         free_patch_ids(&ids);
961         return 0;
962 }