Merge branch 'lt/maint-diff-reduce-lstat'
[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 "color.h"
9 #include "commit.h"
10 #include "diff.h"
11 #include "revision.h"
12 #include "log-tree.h"
13 #include "builtin.h"
14 #include "tag.h"
15 #include "reflog-walk.h"
16 #include "patch-ids.h"
17 #include "run-command.h"
18 #include "shortlog.h"
19 #include "remote.h"
20 #include "string-list.h"
21
22 /* Set a default date-time format for git log ("log.date" config variable) */
23 static const char *default_date_mode = NULL;
24
25 static int default_show_root = 1;
26 static const char *fmt_patch_subject_prefix = "PATCH";
27 static const char *fmt_pretty;
28
29 static void cmd_log_init(int argc, const char **argv, const char *prefix,
30                       struct rev_info *rev)
31 {
32         int i;
33
34         rev->abbrev = DEFAULT_ABBREV;
35         rev->commit_format = CMIT_FMT_DEFAULT;
36         if (fmt_pretty)
37                 get_commit_format(fmt_pretty, rev);
38         rev->verbose_header = 1;
39         DIFF_OPT_SET(&rev->diffopt, RECURSIVE);
40         rev->show_root_diff = default_show_root;
41         rev->subject_prefix = fmt_patch_subject_prefix;
42         DIFF_OPT_SET(&rev->diffopt, ALLOW_TEXTCONV);
43
44         if (default_date_mode)
45                 rev->date_mode = parse_date_format(default_date_mode);
46
47         argc = setup_revisions(argc, argv, rev, "HEAD");
48
49         if (rev->diffopt.pickaxe || rev->diffopt.filter)
50                 rev->always_show_header = 0;
51         if (DIFF_OPT_TST(&rev->diffopt, FOLLOW_RENAMES)) {
52                 rev->always_show_header = 0;
53                 if (rev->diffopt.nr_paths != 1)
54                         usage("git logs can only follow renames on one pathname at a time");
55         }
56         for (i = 1; i < argc; i++) {
57                 const char *arg = argv[i];
58                 if (!strcmp(arg, "--decorate")) {
59                         load_ref_decorations();
60                         rev->show_decorations = 1;
61                 } else if (!strcmp(arg, "--source")) {
62                         rev->show_source = 1;
63                 } else
64                         die("unrecognized argument: %s", arg);
65         }
66 }
67
68 /*
69  * This gives a rough estimate for how many commits we
70  * will print out in the list.
71  */
72 static int estimate_commit_count(struct rev_info *rev, struct commit_list *list)
73 {
74         int n = 0;
75
76         while (list) {
77                 struct commit *commit = list->item;
78                 unsigned int flags = commit->object.flags;
79                 list = list->next;
80                 if (!(flags & (TREESAME | UNINTERESTING)))
81                         n++;
82         }
83         return n;
84 }
85
86 static void show_early_header(struct rev_info *rev, const char *stage, int nr)
87 {
88         if (rev->shown_one) {
89                 rev->shown_one = 0;
90                 if (rev->commit_format != CMIT_FMT_ONELINE)
91                         putchar(rev->diffopt.line_termination);
92         }
93         printf("Final output: %d %s\n", nr, stage);
94 }
95
96 struct itimerval early_output_timer;
97
98 static void log_show_early(struct rev_info *revs, struct commit_list *list)
99 {
100         int i = revs->early_output;
101         int show_header = 1;
102
103         sort_in_topological_order(&list, revs->lifo);
104         while (list && i) {
105                 struct commit *commit = list->item;
106                 switch (simplify_commit(revs, commit)) {
107                 case commit_show:
108                         if (show_header) {
109                                 int n = estimate_commit_count(revs, list);
110                                 show_early_header(revs, "incomplete", n);
111                                 show_header = 0;
112                         }
113                         log_tree_commit(revs, commit);
114                         i--;
115                         break;
116                 case commit_ignore:
117                         break;
118                 case commit_error:
119                         return;
120                 }
121                 list = list->next;
122         }
123
124         /* Did we already get enough commits for the early output? */
125         if (!i)
126                 return;
127
128         /*
129          * ..if no, then repeat it twice a second until we
130          * do.
131          *
132          * NOTE! We don't use "it_interval", because if the
133          * reader isn't listening, we want our output to be
134          * throttled by the writing, and not have the timer
135          * trigger every second even if we're blocked on a
136          * reader!
137          */
138         early_output_timer.it_value.tv_sec = 0;
139         early_output_timer.it_value.tv_usec = 500000;
140         setitimer(ITIMER_REAL, &early_output_timer, NULL);
141 }
142
143 static void early_output(int signal)
144 {
145         show_early_output = log_show_early;
146 }
147
148 static void setup_early_output(struct rev_info *rev)
149 {
150         struct sigaction sa;
151
152         /*
153          * Set up the signal handler, minimally intrusively:
154          * we only set a single volatile integer word (not
155          * using sigatomic_t - trying to avoid unnecessary
156          * system dependencies and headers), and using
157          * SA_RESTART.
158          */
159         memset(&sa, 0, sizeof(sa));
160         sa.sa_handler = early_output;
161         sigemptyset(&sa.sa_mask);
162         sa.sa_flags = SA_RESTART;
163         sigaction(SIGALRM, &sa, NULL);
164
165         /*
166          * If we can get the whole output in less than a
167          * tenth of a second, don't even bother doing the
168          * early-output thing..
169          *
170          * This is a one-time-only trigger.
171          */
172         early_output_timer.it_value.tv_sec = 0;
173         early_output_timer.it_value.tv_usec = 100000;
174         setitimer(ITIMER_REAL, &early_output_timer, NULL);
175 }
176
177 static void finish_early_output(struct rev_info *rev)
178 {
179         int n = estimate_commit_count(rev, rev->commits);
180         signal(SIGALRM, SIG_IGN);
181         show_early_header(rev, "done", n);
182 }
183
184 static int cmd_log_walk(struct rev_info *rev)
185 {
186         struct commit *commit;
187
188         if (rev->early_output)
189                 setup_early_output(rev);
190
191         if (prepare_revision_walk(rev))
192                 die("revision walk setup failed");
193
194         if (rev->early_output)
195                 finish_early_output(rev);
196
197         /*
198          * For --check and --exit-code, the exit code is based on CHECK_FAILED
199          * and HAS_CHANGES being accumulated in rev->diffopt, so be careful to
200          * retain that state information if replacing rev->diffopt in this loop
201          */
202         while ((commit = get_revision(rev)) != NULL) {
203                 log_tree_commit(rev, commit);
204                 if (!rev->reflog_info) {
205                         /* we allow cycles in reflog ancestry */
206                         free(commit->buffer);
207                         commit->buffer = NULL;
208                 }
209                 free_commit_list(commit->parents);
210                 commit->parents = NULL;
211         }
212         if (rev->diffopt.output_format & DIFF_FORMAT_CHECKDIFF &&
213             DIFF_OPT_TST(&rev->diffopt, CHECK_FAILED)) {
214                 return 02;
215         }
216         return diff_result_code(&rev->diffopt, 0);
217 }
218
219 static int git_log_config(const char *var, const char *value, void *cb)
220 {
221         if (!strcmp(var, "format.pretty"))
222                 return git_config_string(&fmt_pretty, var, value);
223         if (!strcmp(var, "format.subjectprefix"))
224                 return git_config_string(&fmt_patch_subject_prefix, var, value);
225         if (!strcmp(var, "log.date"))
226                 return git_config_string(&default_date_mode, var, value);
227         if (!strcmp(var, "log.showroot")) {
228                 default_show_root = git_config_bool(var, value);
229                 return 0;
230         }
231         return git_diff_ui_config(var, value, cb);
232 }
233
234 int cmd_whatchanged(int argc, const char **argv, const char *prefix)
235 {
236         struct rev_info rev;
237
238         git_config(git_log_config, NULL);
239
240         if (diff_use_color_default == -1)
241                 diff_use_color_default = git_use_color_default;
242
243         init_revisions(&rev, prefix);
244         rev.diff = 1;
245         rev.simplify_history = 0;
246         cmd_log_init(argc, argv, prefix, &rev);
247         if (!rev.diffopt.output_format)
248                 rev.diffopt.output_format = DIFF_FORMAT_RAW;
249         return cmd_log_walk(&rev);
250 }
251
252 static void show_tagger(char *buf, int len, struct rev_info *rev)
253 {
254         struct strbuf out = STRBUF_INIT;
255
256         pp_user_info("Tagger", rev->commit_format, &out, buf, rev->date_mode,
257                 git_log_output_encoding ?
258                 git_log_output_encoding: git_commit_encoding);
259         printf("%s\n", out.buf);
260         strbuf_release(&out);
261 }
262
263 static int show_object(const unsigned char *sha1, int show_tag_object,
264         struct rev_info *rev)
265 {
266         unsigned long size;
267         enum object_type type;
268         char *buf = read_sha1_file(sha1, &type, &size);
269         int offset = 0;
270
271         if (!buf)
272                 return error("Could not read object %s", sha1_to_hex(sha1));
273
274         if (show_tag_object)
275                 while (offset < size && buf[offset] != '\n') {
276                         int new_offset = offset + 1;
277                         while (new_offset < size && buf[new_offset++] != '\n')
278                                 ; /* do nothing */
279                         if (!prefixcmp(buf + offset, "tagger "))
280                                 show_tagger(buf + offset + 7,
281                                             new_offset - offset - 7, rev);
282                         offset = new_offset;
283                 }
284
285         if (offset < size)
286                 fwrite(buf + offset, size - offset, 1, stdout);
287         free(buf);
288         return 0;
289 }
290
291 static int show_tree_object(const unsigned char *sha1,
292                 const char *base, int baselen,
293                 const char *pathname, unsigned mode, int stage, void *context)
294 {
295         printf("%s%s\n", pathname, S_ISDIR(mode) ? "/" : "");
296         return 0;
297 }
298
299 int cmd_show(int argc, const char **argv, const char *prefix)
300 {
301         struct rev_info rev;
302         struct object_array_entry *objects;
303         int i, count, ret = 0;
304
305         git_config(git_log_config, NULL);
306
307         if (diff_use_color_default == -1)
308                 diff_use_color_default = git_use_color_default;
309
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                         if (ret)
337                                 break;
338                         o = parse_object(t->tagged->sha1);
339                         if (!o)
340                                 ret = error("Could not read object %s",
341                                             sha1_to_hex(t->tagged->sha1));
342                         objects[i].item = o;
343                         i--;
344                         break;
345                 }
346                 case OBJ_TREE:
347                         printf("%stree %s%s\n\n",
348                                         diff_get_color_opt(&rev.diffopt, DIFF_COMMIT),
349                                         name,
350                                         diff_get_color_opt(&rev.diffopt, DIFF_RESET));
351                         read_tree_recursive((struct tree *)o, "", 0, 0, NULL,
352                                         show_tree_object, NULL);
353                         break;
354                 case OBJ_COMMIT:
355                         rev.pending.nr = rev.pending.alloc = 0;
356                         rev.pending.objects = NULL;
357                         add_object_array(o, name, &rev.pending);
358                         ret = cmd_log_walk(&rev);
359                         break;
360                 default:
361                         ret = error("Unknown type: %d", o->type);
362                 }
363         }
364         free(objects);
365         return ret;
366 }
367
368 /*
369  * This is equivalent to "git log -g --abbrev-commit --pretty=oneline"
370  */
371 int cmd_log_reflog(int argc, const char **argv, const char *prefix)
372 {
373         struct rev_info rev;
374
375         git_config(git_log_config, NULL);
376
377         if (diff_use_color_default == -1)
378                 diff_use_color_default = git_use_color_default;
379
380         init_revisions(&rev, prefix);
381         init_reflog_walk(&rev.reflog_info);
382         rev.abbrev_commit = 1;
383         rev.verbose_header = 1;
384         cmd_log_init(argc, argv, prefix, &rev);
385
386         /*
387          * This means that we override whatever commit format the user gave
388          * on the cmd line.  Sad, but cmd_log_init() currently doesn't
389          * allow us to set a different default.
390          */
391         rev.commit_format = CMIT_FMT_ONELINE;
392         rev.use_terminator = 1;
393         rev.always_show_header = 1;
394
395         /*
396          * We get called through "git reflog", so unlike the other log
397          * routines, we need to set up our pager manually..
398          */
399         setup_pager();
400
401         return cmd_log_walk(&rev);
402 }
403
404 int cmd_log(int argc, const char **argv, const char *prefix)
405 {
406         struct rev_info rev;
407
408         git_config(git_log_config, NULL);
409
410         if (diff_use_color_default == -1)
411                 diff_use_color_default = git_use_color_default;
412
413         init_revisions(&rev, prefix);
414         rev.always_show_header = 1;
415         cmd_log_init(argc, argv, prefix, &rev);
416         return cmd_log_walk(&rev);
417 }
418
419 /* format-patch */
420
421 static const char *fmt_patch_suffix = ".patch";
422 static int numbered = 0;
423 static int auto_number = 1;
424
425 static char *default_attach = NULL;
426
427 static char **extra_hdr;
428 static int extra_hdr_nr;
429 static int extra_hdr_alloc;
430
431 static char **extra_to;
432 static int extra_to_nr;
433 static int extra_to_alloc;
434
435 static char **extra_cc;
436 static int extra_cc_nr;
437 static int extra_cc_alloc;
438
439 static void add_header(const char *value)
440 {
441         int len = strlen(value);
442         while (len && value[len - 1] == '\n')
443                 len--;
444         if (!strncasecmp(value, "to: ", 4)) {
445                 ALLOC_GROW(extra_to, extra_to_nr + 1, extra_to_alloc);
446                 extra_to[extra_to_nr++] = xstrndup(value + 4, len - 4);
447                 return;
448         }
449         if (!strncasecmp(value, "cc: ", 4)) {
450                 ALLOC_GROW(extra_cc, extra_cc_nr + 1, extra_cc_alloc);
451                 extra_cc[extra_cc_nr++] = xstrndup(value + 4, len - 4);
452                 return;
453         }
454         ALLOC_GROW(extra_hdr, extra_hdr_nr + 1, extra_hdr_alloc);
455         extra_hdr[extra_hdr_nr++] = xstrndup(value, len);
456 }
457
458 #define THREAD_SHALLOW 1
459 #define THREAD_DEEP 2
460 static int thread = 0;
461 static int do_signoff = 0;
462
463 static int git_format_config(const char *var, const char *value, void *cb)
464 {
465         if (!strcmp(var, "format.headers")) {
466                 if (!value)
467                         die("format.headers without value");
468                 add_header(value);
469                 return 0;
470         }
471         if (!strcmp(var, "format.suffix"))
472                 return git_config_string(&fmt_patch_suffix, var, value);
473         if (!strcmp(var, "format.cc")) {
474                 if (!value)
475                         return config_error_nonbool(var);
476                 ALLOC_GROW(extra_cc, extra_cc_nr + 1, extra_cc_alloc);
477                 extra_cc[extra_cc_nr++] = xstrdup(value);
478                 return 0;
479         }
480         if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
481                 return 0;
482         }
483         if (!strcmp(var, "format.numbered")) {
484                 if (value && !strcasecmp(value, "auto")) {
485                         auto_number = 1;
486                         return 0;
487                 }
488                 numbered = git_config_bool(var, value);
489                 auto_number = auto_number && numbered;
490                 return 0;
491         }
492         if (!strcmp(var, "format.attach")) {
493                 if (value && *value)
494                         default_attach = xstrdup(value);
495                 else
496                         default_attach = xstrdup(git_version_string);
497                 return 0;
498         }
499         if (!strcmp(var, "format.thread")) {
500                 if (value && !strcasecmp(value, "deep")) {
501                         thread = THREAD_DEEP;
502                         return 0;
503                 }
504                 if (value && !strcasecmp(value, "shallow")) {
505                         thread = THREAD_SHALLOW;
506                         return 0;
507                 }
508                 thread = git_config_bool(var, value) && THREAD_SHALLOW;
509                 return 0;
510         }
511         if (!strcmp(var, "format.signoff")) {
512                 do_signoff = git_config_bool(var, value);
513                 return 0;
514         }
515
516         return git_log_config(var, value, cb);
517 }
518
519 static FILE *realstdout = NULL;
520 static const char *output_directory = NULL;
521 static int outdir_offset;
522
523 static int reopen_stdout(struct commit *commit, struct rev_info *rev)
524 {
525         struct strbuf filename = STRBUF_INIT;
526         int suffix_len = strlen(fmt_patch_suffix) + 1;
527
528         if (output_directory) {
529                 strbuf_addstr(&filename, output_directory);
530                 if (filename.len >=
531                     PATH_MAX - FORMAT_PATCH_NAME_MAX - suffix_len)
532                         return error("name of output directory is too long");
533                 if (filename.buf[filename.len - 1] != '/')
534                         strbuf_addch(&filename, '/');
535         }
536
537         get_patch_filename(commit, rev->nr, fmt_patch_suffix, &filename);
538
539         if (!DIFF_OPT_TST(&rev->diffopt, QUIET))
540                 fprintf(realstdout, "%s\n", filename.buf + outdir_offset);
541
542         if (freopen(filename.buf, "w", stdout) == NULL)
543                 return error("Cannot open patch file %s", filename.buf);
544
545         strbuf_release(&filename);
546         return 0;
547 }
548
549 static void get_patch_ids(struct rev_info *rev, struct patch_ids *ids, const char *prefix)
550 {
551         struct rev_info check_rev;
552         struct commit *commit;
553         struct object *o1, *o2;
554         unsigned flags1, flags2;
555
556         if (rev->pending.nr != 2)
557                 die("Need exactly one range.");
558
559         o1 = rev->pending.objects[0].item;
560         flags1 = o1->flags;
561         o2 = rev->pending.objects[1].item;
562         flags2 = o2->flags;
563
564         if ((flags1 & UNINTERESTING) == (flags2 & UNINTERESTING))
565                 die("Not a range.");
566
567         init_patch_ids(ids);
568
569         /* given a range a..b get all patch ids for b..a */
570         init_revisions(&check_rev, prefix);
571         o1->flags ^= UNINTERESTING;
572         o2->flags ^= UNINTERESTING;
573         add_pending_object(&check_rev, o1, "o1");
574         add_pending_object(&check_rev, o2, "o2");
575         if (prepare_revision_walk(&check_rev))
576                 die("revision walk setup failed");
577
578         while ((commit = get_revision(&check_rev)) != NULL) {
579                 /* ignore merges */
580                 if (commit->parents && commit->parents->next)
581                         continue;
582
583                 add_commit_patch_id(commit, ids);
584         }
585
586         /* reset for next revision walk */
587         clear_commit_marks((struct commit *)o1,
588                         SEEN | UNINTERESTING | SHOWN | ADDED);
589         clear_commit_marks((struct commit *)o2,
590                         SEEN | UNINTERESTING | SHOWN | ADDED);
591         o1->flags = flags1;
592         o2->flags = flags2;
593 }
594
595 static void gen_message_id(struct rev_info *info, char *base)
596 {
597         const char *committer = git_committer_info(IDENT_WARN_ON_NO_NAME);
598         const char *email_start = strrchr(committer, '<');
599         const char *email_end = strrchr(committer, '>');
600         struct strbuf buf = STRBUF_INIT;
601         if (!email_start || !email_end || email_start > email_end - 1)
602                 die("Could not extract email from committer identity.");
603         strbuf_addf(&buf, "%s.%lu.git.%.*s", base,
604                     (unsigned long) time(NULL),
605                     (int)(email_end - email_start - 1), email_start + 1);
606         info->message_id = strbuf_detach(&buf, NULL);
607 }
608
609 static void make_cover_letter(struct rev_info *rev, int use_stdout,
610                               int numbered, int numbered_files,
611                               struct commit *origin,
612                               int nr, struct commit **list, struct commit *head)
613 {
614         const char *committer;
615         const char *subject_start = NULL;
616         const char *body = "*** SUBJECT HERE ***\n\n*** BLURB HERE ***\n";
617         const char *msg;
618         const char *extra_headers = rev->extra_headers;
619         struct shortlog log;
620         struct strbuf sb = STRBUF_INIT;
621         int i;
622         const char *encoding = "utf-8";
623         struct diff_options opts;
624         int need_8bit_cte = 0;
625         struct commit *commit = NULL;
626
627         if (rev->commit_format != CMIT_FMT_EMAIL)
628                 die("Cover letter needs email format");
629
630         committer = git_committer_info(0);
631
632         if (!numbered_files) {
633                 /*
634                  * We fake a commit for the cover letter so we get the filename
635                  * desired.
636                  */
637                 commit = xcalloc(1, sizeof(*commit));
638                 commit->buffer = xmalloc(400);
639                 snprintf(commit->buffer, 400,
640                         "tree 0000000000000000000000000000000000000000\n"
641                         "parent %s\n"
642                         "author %s\n"
643                         "committer %s\n\n"
644                         "cover letter\n",
645                         sha1_to_hex(head->object.sha1), committer, committer);
646         }
647
648         if (!use_stdout && reopen_stdout(commit, rev))
649                 return;
650
651         if (commit) {
652
653                 free(commit->buffer);
654                 free(commit);
655         }
656
657         log_write_email_headers(rev, head, &subject_start, &extra_headers,
658                                 &need_8bit_cte);
659
660         msg = body;
661         pp_user_info(NULL, CMIT_FMT_EMAIL, &sb, committer, DATE_RFC2822,
662                      encoding);
663         pp_title_line(CMIT_FMT_EMAIL, &msg, &sb, subject_start, extra_headers,
664                       encoding, need_8bit_cte);
665         pp_remainder(CMIT_FMT_EMAIL, &msg, &sb, 0);
666         printf("%s\n", sb.buf);
667
668         strbuf_release(&sb);
669
670         shortlog_init(&log);
671         log.wrap_lines = 1;
672         log.wrap = 72;
673         log.in1 = 2;
674         log.in2 = 4;
675         for (i = 0; i < nr; i++)
676                 shortlog_add_commit(&log, list[i]);
677
678         shortlog_output(&log);
679
680         /*
681          * We can only do diffstat with a unique reference point
682          */
683         if (!origin)
684                 return;
685
686         memcpy(&opts, &rev->diffopt, sizeof(opts));
687         opts.output_format = DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT;
688
689         diff_setup_done(&opts);
690
691         diff_tree_sha1(origin->tree->object.sha1,
692                        head->tree->object.sha1,
693                        "", &opts);
694         diffcore_std(&opts);
695         diff_flush(&opts);
696
697         printf("\n");
698 }
699
700 static const char *clean_message_id(const char *msg_id)
701 {
702         char ch;
703         const char *a, *z, *m;
704
705         m = msg_id;
706         while ((ch = *m) && (isspace(ch) || (ch == '<')))
707                 m++;
708         a = m;
709         z = NULL;
710         while ((ch = *m)) {
711                 if (!isspace(ch) && (ch != '>'))
712                         z = m;
713                 m++;
714         }
715         if (!z)
716                 die("insane in-reply-to: %s", msg_id);
717         if (++z == m)
718                 return a;
719         return xmemdupz(a, z - a);
720 }
721
722 static const char *set_outdir(const char *prefix, const char *output_directory)
723 {
724         if (output_directory && is_absolute_path(output_directory))
725                 return output_directory;
726
727         if (!prefix || !*prefix) {
728                 if (output_directory)
729                         return output_directory;
730                 /* The user did not explicitly ask for "./" */
731                 outdir_offset = 2;
732                 return "./";
733         }
734
735         outdir_offset = strlen(prefix);
736         if (!output_directory)
737                 return prefix;
738
739         return xstrdup(prefix_filename(prefix, outdir_offset,
740                                        output_directory));
741 }
742
743 int cmd_format_patch(int argc, const char **argv, const char *prefix)
744 {
745         struct commit *commit;
746         struct commit **list = NULL;
747         struct rev_info rev;
748         int nr = 0, total, i, j;
749         int use_stdout = 0;
750         int start_number = -1;
751         int keep_subject = 0;
752         int numbered_files = 0;         /* _just_ numbers */
753         int subject_prefix = 0;
754         int ignore_if_in_upstream = 0;
755         int cover_letter = 0;
756         int boundary_count = 0;
757         int no_binary_diff = 0;
758         int numbered_cmdline_opt = 0;
759         struct commit *origin = NULL, *head = NULL;
760         const char *in_reply_to = NULL;
761         struct patch_ids ids;
762         char *add_signoff = NULL;
763         struct strbuf buf = STRBUF_INIT;
764
765         git_config(git_format_config, NULL);
766         init_revisions(&rev, prefix);
767         rev.commit_format = CMIT_FMT_EMAIL;
768         rev.verbose_header = 1;
769         rev.diff = 1;
770         rev.combine_merges = 0;
771         rev.ignore_merges = 1;
772         DIFF_OPT_SET(&rev.diffopt, RECURSIVE);
773
774         rev.subject_prefix = fmt_patch_subject_prefix;
775
776         if (default_attach) {
777                 rev.mime_boundary = default_attach;
778                 rev.no_inline = 1;
779         }
780
781         /*
782          * Parse the arguments before setup_revisions(), or something
783          * like "git format-patch -o a123 HEAD^.." may fail; a123 is
784          * possibly a valid SHA1.
785          */
786         for (i = 1, j = 1; i < argc; i++) {
787                 if (!strcmp(argv[i], "--stdout"))
788                         use_stdout = 1;
789                 else if (!strcmp(argv[i], "-n") ||
790                                 !strcmp(argv[i], "--numbered")) {
791                         numbered = 1;
792                         numbered_cmdline_opt = 1;
793                 }
794                 else if (!strcmp(argv[i], "-N") ||
795                                 !strcmp(argv[i], "--no-numbered")) {
796                         numbered = 0;
797                         auto_number = 0;
798                 }
799                 else if (!prefixcmp(argv[i], "--start-number="))
800                         start_number = strtol(argv[i] + 15, NULL, 10);
801                 else if (!strcmp(argv[i], "--numbered-files"))
802                         numbered_files = 1;
803                 else if (!strcmp(argv[i], "--start-number")) {
804                         i++;
805                         if (i == argc)
806                                 die("Need a number for --start-number");
807                         start_number = strtol(argv[i], NULL, 10);
808                 }
809                 else if (!prefixcmp(argv[i], "--cc=")) {
810                         ALLOC_GROW(extra_cc, extra_cc_nr + 1, extra_cc_alloc);
811                         extra_cc[extra_cc_nr++] = xstrdup(argv[i] + 5);
812                 }
813                 else if (!strcmp(argv[i], "-k") ||
814                                 !strcmp(argv[i], "--keep-subject")) {
815                         keep_subject = 1;
816                         rev.total = -1;
817                 }
818                 else if (!strcmp(argv[i], "--output-directory") ||
819                          !strcmp(argv[i], "-o")) {
820                         i++;
821                         if (argc <= i)
822                                 die("Which directory?");
823                         if (output_directory)
824                                 die("Two output directories?");
825                         output_directory = argv[i];
826                 }
827                 else if (!strcmp(argv[i], "--signoff") ||
828                          !strcmp(argv[i], "-s")) {
829                         do_signoff = 1;
830                 }
831                 else if (!strcmp(argv[i], "--attach")) {
832                         rev.mime_boundary = git_version_string;
833                         rev.no_inline = 1;
834                 }
835                 else if (!prefixcmp(argv[i], "--attach=")) {
836                         rev.mime_boundary = argv[i] + 9;
837                         rev.no_inline = 1;
838                 }
839                 else if (!strcmp(argv[i], "--no-attach")) {
840                         rev.mime_boundary = NULL;
841                         rev.no_inline = 0;
842                 }
843                 else if (!strcmp(argv[i], "--inline")) {
844                         rev.mime_boundary = git_version_string;
845                         rev.no_inline = 0;
846                 }
847                 else if (!prefixcmp(argv[i], "--inline=")) {
848                         rev.mime_boundary = argv[i] + 9;
849                         rev.no_inline = 0;
850                 }
851                 else if (!strcmp(argv[i], "--ignore-if-in-upstream"))
852                         ignore_if_in_upstream = 1;
853                 else if (!strcmp(argv[i], "--thread")
854                         || !strcmp(argv[i], "--thread=shallow"))
855                         thread = THREAD_SHALLOW;
856                 else if (!strcmp(argv[i], "--thread=deep"))
857                         thread = THREAD_DEEP;
858                 else if (!strcmp(argv[i], "--no-thread"))
859                         thread = 0;
860                 else if (!prefixcmp(argv[i], "--in-reply-to="))
861                         in_reply_to = argv[i] + 14;
862                 else if (!strcmp(argv[i], "--in-reply-to")) {
863                         i++;
864                         if (i == argc)
865                                 die("Need a Message-Id for --in-reply-to");
866                         in_reply_to = argv[i];
867                 } else if (!prefixcmp(argv[i], "--subject-prefix=")) {
868                         subject_prefix = 1;
869                         rev.subject_prefix = argv[i] + 17;
870                 } else if (!prefixcmp(argv[i], "--suffix="))
871                         fmt_patch_suffix = argv[i] + 9;
872                 else if (!strcmp(argv[i], "--cover-letter"))
873                         cover_letter = 1;
874                 else if (!strcmp(argv[i], "--no-binary"))
875                         no_binary_diff = 1;
876                 else if (!prefixcmp(argv[i], "--add-header="))
877                         add_header(argv[i] + 13);
878                 else
879                         argv[j++] = argv[i];
880         }
881         argc = j;
882
883         if (do_signoff) {
884                 const char *committer;
885                 const char *endpos;
886                 committer = git_committer_info(IDENT_ERROR_ON_NO_NAME);
887                 endpos = strchr(committer, '>');
888                 if (!endpos)
889                         die("bogus committer info %s", committer);
890                 add_signoff = xmemdupz(committer, endpos - committer + 1);
891         }
892
893         for (i = 0; i < extra_hdr_nr; i++) {
894                 strbuf_addstr(&buf, extra_hdr[i]);
895                 strbuf_addch(&buf, '\n');
896         }
897
898         if (extra_to_nr)
899                 strbuf_addstr(&buf, "To: ");
900         for (i = 0; i < extra_to_nr; i++) {
901                 if (i)
902                         strbuf_addstr(&buf, "    ");
903                 strbuf_addstr(&buf, extra_to[i]);
904                 if (i + 1 < extra_to_nr)
905                         strbuf_addch(&buf, ',');
906                 strbuf_addch(&buf, '\n');
907         }
908
909         if (extra_cc_nr)
910                 strbuf_addstr(&buf, "Cc: ");
911         for (i = 0; i < extra_cc_nr; i++) {
912                 if (i)
913                         strbuf_addstr(&buf, "    ");
914                 strbuf_addstr(&buf, extra_cc[i]);
915                 if (i + 1 < extra_cc_nr)
916                         strbuf_addch(&buf, ',');
917                 strbuf_addch(&buf, '\n');
918         }
919
920         rev.extra_headers = strbuf_detach(&buf, 0);
921
922         if (start_number < 0)
923                 start_number = 1;
924
925         /*
926          * If numbered is set solely due to format.numbered in config,
927          * and it would conflict with --keep-subject (-k) from the
928          * command line, reset "numbered".
929          */
930         if (numbered && keep_subject && !numbered_cmdline_opt)
931                 numbered = 0;
932
933         if (numbered && keep_subject)
934                 die ("-n and -k are mutually exclusive.");
935         if (keep_subject && subject_prefix)
936                 die ("--subject-prefix and -k are mutually exclusive.");
937
938         argc = setup_revisions(argc, argv, &rev, "HEAD");
939         if (argc > 1)
940                 die ("unrecognized argument: %s", argv[1]);
941
942         if (!rev.diffopt.output_format
943                 || rev.diffopt.output_format == DIFF_FORMAT_PATCH)
944                 rev.diffopt.output_format = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_SUMMARY | DIFF_FORMAT_PATCH;
945
946         if (!DIFF_OPT_TST(&rev.diffopt, TEXT) && !no_binary_diff)
947                 DIFF_OPT_SET(&rev.diffopt, BINARY);
948
949         if (!use_stdout)
950                 output_directory = set_outdir(prefix, output_directory);
951
952         if (output_directory) {
953                 if (use_stdout)
954                         die("standard output, or directory, which one?");
955                 if (mkdir(output_directory, 0777) < 0 && errno != EEXIST)
956                         die("Could not create directory %s",
957                             output_directory);
958         }
959
960         if (rev.pending.nr == 1) {
961                 if (rev.max_count < 0 && !rev.show_root_diff) {
962                         /*
963                          * This is traditional behaviour of "git format-patch
964                          * origin" that prepares what the origin side still
965                          * does not have.
966                          */
967                         rev.pending.objects[0].item->flags |= UNINTERESTING;
968                         add_head_to_pending(&rev);
969                 }
970                 /*
971                  * Otherwise, it is "format-patch -22 HEAD", and/or
972                  * "format-patch --root HEAD".  The user wants
973                  * get_revision() to do the usual traversal.
974                  */
975         }
976
977         /*
978          * We cannot move this anywhere earlier because we do want to
979          * know if --root was given explicitly from the comand line.
980          */
981         rev.show_root_diff = 1;
982
983         if (cover_letter) {
984                 /* remember the range */
985                 int i;
986                 for (i = 0; i < rev.pending.nr; i++) {
987                         struct object *o = rev.pending.objects[i].item;
988                         if (!(o->flags & UNINTERESTING))
989                                 head = (struct commit *)o;
990                 }
991                 /* We can't generate a cover letter without any patches */
992                 if (!head)
993                         return 0;
994         }
995
996         if (ignore_if_in_upstream)
997                 get_patch_ids(&rev, &ids, prefix);
998
999         if (!use_stdout)
1000                 realstdout = xfdopen(xdup(1), "w");
1001
1002         if (prepare_revision_walk(&rev))
1003                 die("revision walk setup failed");
1004         rev.boundary = 1;
1005         while ((commit = get_revision(&rev)) != NULL) {
1006                 if (commit->object.flags & BOUNDARY) {
1007                         boundary_count++;
1008                         origin = (boundary_count == 1) ? commit : NULL;
1009                         continue;
1010                 }
1011
1012                 /* ignore merges */
1013                 if (commit->parents && commit->parents->next)
1014                         continue;
1015
1016                 if (ignore_if_in_upstream &&
1017                                 has_commit_patch_id(commit, &ids))
1018                         continue;
1019
1020                 nr++;
1021                 list = xrealloc(list, nr * sizeof(list[0]));
1022                 list[nr - 1] = commit;
1023         }
1024         total = nr;
1025         if (!keep_subject && auto_number && total > 1)
1026                 numbered = 1;
1027         if (numbered)
1028                 rev.total = total + start_number - 1;
1029         if (in_reply_to || thread || cover_letter)
1030                 rev.ref_message_ids = xcalloc(1, sizeof(struct string_list));
1031         if (in_reply_to) {
1032                 const char *msgid = clean_message_id(in_reply_to);
1033                 string_list_append(msgid, rev.ref_message_ids);
1034         }
1035         rev.numbered_files = numbered_files;
1036         rev.patch_suffix = fmt_patch_suffix;
1037         if (cover_letter) {
1038                 if (thread)
1039                         gen_message_id(&rev, "cover");
1040                 make_cover_letter(&rev, use_stdout, numbered, numbered_files,
1041                                   origin, nr, list, head);
1042                 total++;
1043                 start_number--;
1044         }
1045         rev.add_signoff = add_signoff;
1046         while (0 <= --nr) {
1047                 int shown;
1048                 commit = list[nr];
1049                 rev.nr = total - nr + (start_number - 1);
1050                 /* Make the second and subsequent mails replies to the first */
1051                 if (thread) {
1052                         /* Have we already had a message ID? */
1053                         if (rev.message_id) {
1054                                 /*
1055                                  * For deep threading: make every mail
1056                                  * a reply to the previous one, no
1057                                  * matter what other options are set.
1058                                  *
1059                                  * For shallow threading:
1060                                  *
1061                                  * Without --cover-letter and
1062                                  * --in-reply-to, make every mail a
1063                                  * reply to the one before.
1064                                  *
1065                                  * With --in-reply-to but no
1066                                  * --cover-letter, make every mail a
1067                                  * reply to the <reply-to>.
1068                                  *
1069                                  * With --cover-letter, make every
1070                                  * mail but the cover letter a reply
1071                                  * to the cover letter.  The cover
1072                                  * letter is a reply to the
1073                                  * --in-reply-to, if specified.
1074                                  */
1075                                 if (thread == THREAD_SHALLOW
1076                                     && rev.ref_message_ids->nr > 0
1077                                     && (!cover_letter || rev.nr > 1))
1078                                         free(rev.message_id);
1079                                 else
1080                                         string_list_append(rev.message_id,
1081                                                            rev.ref_message_ids);
1082                         }
1083                         gen_message_id(&rev, sha1_to_hex(commit->object.sha1));
1084                 }
1085
1086                 if (!use_stdout && reopen_stdout(numbered_files ? NULL : commit,
1087                                                  &rev))
1088                         die("Failed to create output files");
1089                 shown = log_tree_commit(&rev, commit);
1090                 free(commit->buffer);
1091                 commit->buffer = NULL;
1092
1093                 /* We put one extra blank line between formatted
1094                  * patches and this flag is used by log-tree code
1095                  * to see if it needs to emit a LF before showing
1096                  * the log; when using one file per patch, we do
1097                  * not want the extra blank line.
1098                  */
1099                 if (!use_stdout)
1100                         rev.shown_one = 0;
1101                 if (shown) {
1102                         if (rev.mime_boundary)
1103                                 printf("\n--%s%s--\n\n\n",
1104                                        mime_boundary_leader,
1105                                        rev.mime_boundary);
1106                         else
1107                                 printf("-- \n%s\n\n", git_version_string);
1108                 }
1109                 if (!use_stdout)
1110                         fclose(stdout);
1111         }
1112         free(list);
1113         if (ignore_if_in_upstream)
1114                 free_patch_ids(&ids);
1115         return 0;
1116 }
1117
1118 static int add_pending_commit(const char *arg, struct rev_info *revs, int flags)
1119 {
1120         unsigned char sha1[20];
1121         if (get_sha1(arg, sha1) == 0) {
1122                 struct commit *commit = lookup_commit_reference(sha1);
1123                 if (commit) {
1124                         commit->object.flags |= flags;
1125                         add_pending_object(revs, &commit->object, arg);
1126                         return 0;
1127                 }
1128         }
1129         return -1;
1130 }
1131
1132 static const char cherry_usage[] =
1133 "git cherry [-v] [<upstream> [<head> [<limit>]]]";
1134 int cmd_cherry(int argc, const char **argv, const char *prefix)
1135 {
1136         struct rev_info revs;
1137         struct patch_ids ids;
1138         struct commit *commit;
1139         struct commit_list *list = NULL;
1140         struct branch *current_branch;
1141         const char *upstream;
1142         const char *head = "HEAD";
1143         const char *limit = NULL;
1144         int verbose = 0;
1145
1146         if (argc > 1 && !strcmp(argv[1], "-v")) {
1147                 verbose = 1;
1148                 argc--;
1149                 argv++;
1150         }
1151
1152         switch (argc) {
1153         case 4:
1154                 limit = argv[3];
1155                 /* FALLTHROUGH */
1156         case 3:
1157                 head = argv[2];
1158                 /* FALLTHROUGH */
1159         case 2:
1160                 upstream = argv[1];
1161                 break;
1162         default:
1163                 current_branch = branch_get(NULL);
1164                 if (!current_branch || !current_branch->merge
1165                                         || !current_branch->merge[0]
1166                                         || !current_branch->merge[0]->dst) {
1167                         fprintf(stderr, "Could not find a tracked"
1168                                         " remote branch, please"
1169                                         " specify <upstream> manually.\n");
1170                         usage(cherry_usage);
1171                 }
1172
1173                 upstream = current_branch->merge[0]->dst;
1174         }
1175
1176         init_revisions(&revs, prefix);
1177         revs.diff = 1;
1178         revs.combine_merges = 0;
1179         revs.ignore_merges = 1;
1180         DIFF_OPT_SET(&revs.diffopt, RECURSIVE);
1181
1182         if (add_pending_commit(head, &revs, 0))
1183                 die("Unknown commit %s", head);
1184         if (add_pending_commit(upstream, &revs, UNINTERESTING))
1185                 die("Unknown commit %s", upstream);
1186
1187         /* Don't say anything if head and upstream are the same. */
1188         if (revs.pending.nr == 2) {
1189                 struct object_array_entry *o = revs.pending.objects;
1190                 if (hashcmp(o[0].item->sha1, o[1].item->sha1) == 0)
1191                         return 0;
1192         }
1193
1194         get_patch_ids(&revs, &ids, prefix);
1195
1196         if (limit && add_pending_commit(limit, &revs, UNINTERESTING))
1197                 die("Unknown commit %s", limit);
1198
1199         /* reverse the list of commits */
1200         if (prepare_revision_walk(&revs))
1201                 die("revision walk setup failed");
1202         while ((commit = get_revision(&revs)) != NULL) {
1203                 /* ignore merges */
1204                 if (commit->parents && commit->parents->next)
1205                         continue;
1206
1207                 commit_list_insert(commit, &list);
1208         }
1209
1210         while (list) {
1211                 char sign = '+';
1212
1213                 commit = list->item;
1214                 if (has_commit_patch_id(commit, &ids))
1215                         sign = '-';
1216
1217                 if (verbose) {
1218                         struct strbuf buf = STRBUF_INIT;
1219                         pretty_print_commit(CMIT_FMT_ONELINE, commit,
1220                                             &buf, 0, NULL, NULL, 0, 0);
1221                         printf("%c %s %s\n", sign,
1222                                sha1_to_hex(commit->object.sha1), buf.buf);
1223                         strbuf_release(&buf);
1224                 }
1225                 else {
1226                         printf("%c %s\n", sign,
1227                                sha1_to_hex(commit->object.sha1));
1228                 }
1229
1230                 list = list->next;
1231         }
1232
1233         free_patch_ids(&ids);
1234         return 0;
1235 }