Sync with maint
[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 "refs.h"
9 #include "color.h"
10 #include "commit.h"
11 #include "diff.h"
12 #include "revision.h"
13 #include "log-tree.h"
14 #include "builtin.h"
15 #include "tag.h"
16 #include "reflog-walk.h"
17 #include "patch-ids.h"
18 #include "run-command.h"
19 #include "shortlog.h"
20 #include "remote.h"
21 #include "string-list.h"
22 #include "parse-options.h"
23 #include "line-log.h"
24 #include "branch.h"
25 #include "streaming.h"
26 #include "version.h"
27 #include "mailmap.h"
28 #include "gpg-interface.h"
29
30 /* Set a default date-time format for git log ("log.date" config variable) */
31 static const char *default_date_mode = NULL;
32
33 static int default_abbrev_commit;
34 static int default_show_root = 1;
35 static int default_follow;
36 static int decoration_style;
37 static int decoration_given;
38 static int use_mailmap_config;
39 static const char *fmt_patch_subject_prefix = "PATCH";
40 static const char *fmt_pretty;
41
42 static const char * const builtin_log_usage[] = {
43         N_("git log [<options>] [<revision-range>] [[--] <path>...]"),
44         N_("git show [<options>] <object>..."),
45         NULL
46 };
47
48 struct line_opt_callback_data {
49         struct rev_info *rev;
50         const char *prefix;
51         struct string_list args;
52 };
53
54 static int parse_decoration_style(const char *var, const char *value)
55 {
56         switch (git_config_maybe_bool(var, value)) {
57         case 1:
58                 return DECORATE_SHORT_REFS;
59         case 0:
60                 return 0;
61         default:
62                 break;
63         }
64         if (!strcmp(value, "full"))
65                 return DECORATE_FULL_REFS;
66         else if (!strcmp(value, "short"))
67                 return DECORATE_SHORT_REFS;
68         else if (!strcmp(value, "auto"))
69                 return (isatty(1) || pager_in_use()) ? DECORATE_SHORT_REFS : 0;
70         return -1;
71 }
72
73 static int decorate_callback(const struct option *opt, const char *arg, int unset)
74 {
75         if (unset)
76                 decoration_style = 0;
77         else if (arg)
78                 decoration_style = parse_decoration_style("command line", arg);
79         else
80                 decoration_style = DECORATE_SHORT_REFS;
81
82         if (decoration_style < 0)
83                 die(_("invalid --decorate option: %s"), arg);
84
85         decoration_given = 1;
86
87         return 0;
88 }
89
90 static int log_line_range_callback(const struct option *option, const char *arg, int unset)
91 {
92         struct line_opt_callback_data *data = option->value;
93
94         if (!arg)
95                 return -1;
96
97         data->rev->line_level_traverse = 1;
98         string_list_append(&data->args, arg);
99
100         return 0;
101 }
102
103 static void cmd_log_init_defaults(struct rev_info *rev)
104 {
105         if (fmt_pretty)
106                 get_commit_format(fmt_pretty, rev);
107         if (default_follow)
108                 DIFF_OPT_SET(&rev->diffopt, DEFAULT_FOLLOW_RENAMES);
109         rev->verbose_header = 1;
110         DIFF_OPT_SET(&rev->diffopt, RECURSIVE);
111         rev->diffopt.stat_width = -1; /* use full terminal width */
112         rev->diffopt.stat_graph_width = -1; /* respect statGraphWidth config */
113         rev->abbrev_commit = default_abbrev_commit;
114         rev->show_root_diff = default_show_root;
115         rev->subject_prefix = fmt_patch_subject_prefix;
116         DIFF_OPT_SET(&rev->diffopt, ALLOW_TEXTCONV);
117
118         if (default_date_mode)
119                 parse_date_format(default_date_mode, &rev->date_mode);
120         rev->diffopt.touched_flags = 0;
121 }
122
123 static void cmd_log_init_finish(int argc, const char **argv, const char *prefix,
124                          struct rev_info *rev, struct setup_revision_opt *opt)
125 {
126         struct userformat_want w;
127         int quiet = 0, source = 0, mailmap = 0;
128         static struct line_opt_callback_data line_cb = {NULL, NULL, STRING_LIST_INIT_DUP};
129
130         const struct option builtin_log_options[] = {
131                 OPT__QUIET(&quiet, N_("suppress diff output")),
132                 OPT_BOOL(0, "source", &source, N_("show source")),
133                 OPT_BOOL(0, "use-mailmap", &mailmap, N_("Use mail map file")),
134                 { OPTION_CALLBACK, 0, "decorate", NULL, NULL, N_("decorate options"),
135                   PARSE_OPT_OPTARG, decorate_callback},
136                 OPT_CALLBACK('L', NULL, &line_cb, "n,m:file",
137                              N_("Process line range n,m in file, counting from 1"),
138                              log_line_range_callback),
139                 OPT_END()
140         };
141
142         line_cb.rev = rev;
143         line_cb.prefix = prefix;
144
145         mailmap = use_mailmap_config;
146         argc = parse_options(argc, argv, prefix,
147                              builtin_log_options, builtin_log_usage,
148                              PARSE_OPT_KEEP_ARGV0 | PARSE_OPT_KEEP_UNKNOWN |
149                              PARSE_OPT_KEEP_DASHDASH);
150
151         if (quiet)
152                 rev->diffopt.output_format |= DIFF_FORMAT_NO_OUTPUT;
153         argc = setup_revisions(argc, argv, rev, opt);
154
155         /* Any arguments at this point are not recognized */
156         if (argc > 1)
157                 die(_("unrecognized argument: %s"), argv[1]);
158
159         memset(&w, 0, sizeof(w));
160         userformat_find_requirements(NULL, &w);
161
162         if (!rev->show_notes_given && (!rev->pretty_given || w.notes))
163                 rev->show_notes = 1;
164         if (rev->show_notes)
165                 init_display_notes(&rev->notes_opt);
166
167         if (rev->diffopt.pickaxe || rev->diffopt.filter ||
168             DIFF_OPT_TST(&rev->diffopt, FOLLOW_RENAMES))
169                 rev->always_show_header = 0;
170
171         if (source)
172                 rev->show_source = 1;
173
174         if (mailmap) {
175                 rev->mailmap = xcalloc(1, sizeof(struct string_list));
176                 read_mailmap(rev->mailmap, NULL);
177         }
178
179         if (rev->pretty_given && rev->commit_format == CMIT_FMT_RAW) {
180                 /*
181                  * "log --pretty=raw" is special; ignore UI oriented
182                  * configuration variables such as decoration.
183                  */
184                 if (!decoration_given)
185                         decoration_style = 0;
186                 if (!rev->abbrev_commit_given)
187                         rev->abbrev_commit = 0;
188         }
189
190         if (decoration_style) {
191                 rev->show_decorations = 1;
192                 load_ref_decorations(decoration_style);
193         }
194
195         if (rev->line_level_traverse)
196                 line_log_init(rev, line_cb.prefix, &line_cb.args);
197
198         setup_pager();
199 }
200
201 static void cmd_log_init(int argc, const char **argv, const char *prefix,
202                          struct rev_info *rev, struct setup_revision_opt *opt)
203 {
204         cmd_log_init_defaults(rev);
205         cmd_log_init_finish(argc, argv, prefix, rev, opt);
206 }
207
208 /*
209  * This gives a rough estimate for how many commits we
210  * will print out in the list.
211  */
212 static int estimate_commit_count(struct rev_info *rev, struct commit_list *list)
213 {
214         int n = 0;
215
216         while (list) {
217                 struct commit *commit = list->item;
218                 unsigned int flags = commit->object.flags;
219                 list = list->next;
220                 if (!(flags & (TREESAME | UNINTERESTING)))
221                         n++;
222         }
223         return n;
224 }
225
226 static void show_early_header(struct rev_info *rev, const char *stage, int nr)
227 {
228         if (rev->shown_one) {
229                 rev->shown_one = 0;
230                 if (rev->commit_format != CMIT_FMT_ONELINE)
231                         putchar(rev->diffopt.line_termination);
232         }
233         printf(_("Final output: %d %s\n"), nr, stage);
234 }
235
236 static struct itimerval early_output_timer;
237
238 static void log_show_early(struct rev_info *revs, struct commit_list *list)
239 {
240         int i = revs->early_output;
241         int show_header = 1;
242
243         sort_in_topological_order(&list, revs->sort_order);
244         while (list && i) {
245                 struct commit *commit = list->item;
246                 switch (simplify_commit(revs, commit)) {
247                 case commit_show:
248                         if (show_header) {
249                                 int n = estimate_commit_count(revs, list);
250                                 show_early_header(revs, "incomplete", n);
251                                 show_header = 0;
252                         }
253                         log_tree_commit(revs, commit);
254                         i--;
255                         break;
256                 case commit_ignore:
257                         break;
258                 case commit_error:
259                         return;
260                 }
261                 list = list->next;
262         }
263
264         /* Did we already get enough commits for the early output? */
265         if (!i)
266                 return;
267
268         /*
269          * ..if no, then repeat it twice a second until we
270          * do.
271          *
272          * NOTE! We don't use "it_interval", because if the
273          * reader isn't listening, we want our output to be
274          * throttled by the writing, and not have the timer
275          * trigger every second even if we're blocked on a
276          * reader!
277          */
278         early_output_timer.it_value.tv_sec = 0;
279         early_output_timer.it_value.tv_usec = 500000;
280         setitimer(ITIMER_REAL, &early_output_timer, NULL);
281 }
282
283 static void early_output(int signal)
284 {
285         show_early_output = log_show_early;
286 }
287
288 static void setup_early_output(struct rev_info *rev)
289 {
290         struct sigaction sa;
291
292         /*
293          * Set up the signal handler, minimally intrusively:
294          * we only set a single volatile integer word (not
295          * using sigatomic_t - trying to avoid unnecessary
296          * system dependencies and headers), and using
297          * SA_RESTART.
298          */
299         memset(&sa, 0, sizeof(sa));
300         sa.sa_handler = early_output;
301         sigemptyset(&sa.sa_mask);
302         sa.sa_flags = SA_RESTART;
303         sigaction(SIGALRM, &sa, NULL);
304
305         /*
306          * If we can get the whole output in less than a
307          * tenth of a second, don't even bother doing the
308          * early-output thing..
309          *
310          * This is a one-time-only trigger.
311          */
312         early_output_timer.it_value.tv_sec = 0;
313         early_output_timer.it_value.tv_usec = 100000;
314         setitimer(ITIMER_REAL, &early_output_timer, NULL);
315 }
316
317 static void finish_early_output(struct rev_info *rev)
318 {
319         int n = estimate_commit_count(rev, rev->commits);
320         signal(SIGALRM, SIG_IGN);
321         show_early_header(rev, "done", n);
322 }
323
324 static int cmd_log_walk(struct rev_info *rev)
325 {
326         struct commit *commit;
327         int saved_nrl = 0;
328         int saved_dcctc = 0;
329
330         if (rev->early_output)
331                 setup_early_output(rev);
332
333         if (prepare_revision_walk(rev))
334                 die(_("revision walk setup failed"));
335
336         if (rev->early_output)
337                 finish_early_output(rev);
338
339         /*
340          * For --check and --exit-code, the exit code is based on CHECK_FAILED
341          * and HAS_CHANGES being accumulated in rev->diffopt, so be careful to
342          * retain that state information if replacing rev->diffopt in this loop
343          */
344         while ((commit = get_revision(rev)) != NULL) {
345                 if (!log_tree_commit(rev, commit) && rev->max_count >= 0)
346                         /*
347                          * We decremented max_count in get_revision,
348                          * but we didn't actually show the commit.
349                          */
350                         rev->max_count++;
351                 if (!rev->reflog_info) {
352                         /* we allow cycles in reflog ancestry */
353                         free_commit_buffer(commit);
354                 }
355                 free_commit_list(commit->parents);
356                 commit->parents = NULL;
357                 if (saved_nrl < rev->diffopt.needed_rename_limit)
358                         saved_nrl = rev->diffopt.needed_rename_limit;
359                 if (rev->diffopt.degraded_cc_to_c)
360                         saved_dcctc = 1;
361         }
362         rev->diffopt.degraded_cc_to_c = saved_dcctc;
363         rev->diffopt.needed_rename_limit = saved_nrl;
364
365         if (rev->diffopt.output_format & DIFF_FORMAT_CHECKDIFF &&
366             DIFF_OPT_TST(&rev->diffopt, CHECK_FAILED)) {
367                 return 02;
368         }
369         return diff_result_code(&rev->diffopt, 0);
370 }
371
372 static int git_log_config(const char *var, const char *value, void *cb)
373 {
374         const char *slot_name;
375
376         if (!strcmp(var, "format.pretty"))
377                 return git_config_string(&fmt_pretty, var, value);
378         if (!strcmp(var, "format.subjectprefix"))
379                 return git_config_string(&fmt_patch_subject_prefix, var, value);
380         if (!strcmp(var, "log.abbrevcommit")) {
381                 default_abbrev_commit = git_config_bool(var, value);
382                 return 0;
383         }
384         if (!strcmp(var, "log.date"))
385                 return git_config_string(&default_date_mode, var, value);
386         if (!strcmp(var, "log.decorate")) {
387                 decoration_style = parse_decoration_style(var, value);
388                 if (decoration_style < 0)
389                         decoration_style = 0; /* maybe warn? */
390                 return 0;
391         }
392         if (!strcmp(var, "log.showroot")) {
393                 default_show_root = git_config_bool(var, value);
394                 return 0;
395         }
396         if (!strcmp(var, "log.follow")) {
397                 default_follow = git_config_bool(var, value);
398                 return 0;
399         }
400         if (skip_prefix(var, "color.decorate.", &slot_name))
401                 return parse_decorate_color_config(var, slot_name, value);
402         if (!strcmp(var, "log.mailmap")) {
403                 use_mailmap_config = git_config_bool(var, value);
404                 return 0;
405         }
406
407         if (grep_config(var, value, cb) < 0)
408                 return -1;
409         if (git_gpg_config(var, value, cb) < 0)
410                 return -1;
411         return git_diff_ui_config(var, value, cb);
412 }
413
414 int cmd_whatchanged(int argc, const char **argv, const char *prefix)
415 {
416         struct rev_info rev;
417         struct setup_revision_opt opt;
418
419         init_grep_defaults();
420         git_config(git_log_config, NULL);
421
422         init_revisions(&rev, prefix);
423         rev.diff = 1;
424         rev.simplify_history = 0;
425         memset(&opt, 0, sizeof(opt));
426         opt.def = "HEAD";
427         opt.revarg_opt = REVARG_COMMITTISH;
428         cmd_log_init(argc, argv, prefix, &rev, &opt);
429         if (!rev.diffopt.output_format)
430                 rev.diffopt.output_format = DIFF_FORMAT_RAW;
431         return cmd_log_walk(&rev);
432 }
433
434 static void show_tagger(char *buf, int len, struct rev_info *rev)
435 {
436         struct strbuf out = STRBUF_INIT;
437         struct pretty_print_context pp = {0};
438
439         pp.fmt = rev->commit_format;
440         pp.date_mode = rev->date_mode;
441         pp_user_info(&pp, "Tagger", &out, buf, get_log_output_encoding());
442         printf("%s", out.buf);
443         strbuf_release(&out);
444 }
445
446 static int show_blob_object(const unsigned char *sha1, struct rev_info *rev, const char *obj_name)
447 {
448         unsigned char sha1c[20];
449         struct object_context obj_context;
450         char *buf;
451         unsigned long size;
452
453         fflush(stdout);
454         if (!DIFF_OPT_TOUCHED(&rev->diffopt, ALLOW_TEXTCONV) ||
455             !DIFF_OPT_TST(&rev->diffopt, ALLOW_TEXTCONV))
456                 return stream_blob_to_fd(1, sha1, NULL, 0);
457
458         if (get_sha1_with_context(obj_name, 0, sha1c, &obj_context))
459                 die(_("Not a valid object name %s"), obj_name);
460         if (!obj_context.path[0] ||
461             !textconv_object(obj_context.path, obj_context.mode, sha1c, 1, &buf, &size))
462                 return stream_blob_to_fd(1, sha1, NULL, 0);
463
464         if (!buf)
465                 die(_("git show %s: bad file"), obj_name);
466
467         write_or_die(1, buf, size);
468         return 0;
469 }
470
471 static int show_tag_object(const unsigned char *sha1, struct rev_info *rev)
472 {
473         unsigned long size;
474         enum object_type type;
475         char *buf = read_sha1_file(sha1, &type, &size);
476         int offset = 0;
477
478         if (!buf)
479                 return error(_("Could not read object %s"), sha1_to_hex(sha1));
480
481         assert(type == OBJ_TAG);
482         while (offset < size && buf[offset] != '\n') {
483                 int new_offset = offset + 1;
484                 while (new_offset < size && buf[new_offset++] != '\n')
485                         ; /* do nothing */
486                 if (starts_with(buf + offset, "tagger "))
487                         show_tagger(buf + offset + 7,
488                                     new_offset - offset - 7, rev);
489                 offset = new_offset;
490         }
491
492         if (offset < size)
493                 fwrite(buf + offset, size - offset, 1, stdout);
494         free(buf);
495         return 0;
496 }
497
498 static int show_tree_object(const unsigned char *sha1,
499                 struct strbuf *base,
500                 const char *pathname, unsigned mode, int stage, void *context)
501 {
502         printf("%s%s\n", pathname, S_ISDIR(mode) ? "/" : "");
503         return 0;
504 }
505
506 static void show_setup_revisions_tweak(struct rev_info *rev,
507                                        struct setup_revision_opt *opt)
508 {
509         if (rev->ignore_merges) {
510                 /* There was no "-m" on the command line */
511                 rev->ignore_merges = 0;
512                 if (!rev->first_parent_only && !rev->combine_merges) {
513                         /* No "--first-parent", "-c", or "--cc" */
514                         rev->combine_merges = 1;
515                         rev->dense_combined_merges = 1;
516                 }
517         }
518         if (!rev->diffopt.output_format)
519                 rev->diffopt.output_format = DIFF_FORMAT_PATCH;
520 }
521
522 int cmd_show(int argc, const char **argv, const char *prefix)
523 {
524         struct rev_info rev;
525         struct object_array_entry *objects;
526         struct setup_revision_opt opt;
527         struct pathspec match_all;
528         int i, count, ret = 0;
529
530         init_grep_defaults();
531         git_config(git_log_config, NULL);
532
533         memset(&match_all, 0, sizeof(match_all));
534         init_revisions(&rev, prefix);
535         rev.diff = 1;
536         rev.always_show_header = 1;
537         rev.no_walk = REVISION_WALK_NO_WALK_SORTED;
538         rev.diffopt.stat_width = -1;    /* Scale to real terminal size */
539
540         memset(&opt, 0, sizeof(opt));
541         opt.def = "HEAD";
542         opt.tweak = show_setup_revisions_tweak;
543         cmd_log_init(argc, argv, prefix, &rev, &opt);
544
545         if (!rev.no_walk)
546                 return cmd_log_walk(&rev);
547
548         count = rev.pending.nr;
549         objects = rev.pending.objects;
550         for (i = 0; i < count && !ret; i++) {
551                 struct object *o = objects[i].item;
552                 const char *name = objects[i].name;
553                 switch (o->type) {
554                 case OBJ_BLOB:
555                         ret = show_blob_object(o->oid.hash, &rev, name);
556                         break;
557                 case OBJ_TAG: {
558                         struct tag *t = (struct tag *)o;
559
560                         if (rev.shown_one)
561                                 putchar('\n');
562                         printf("%stag %s%s\n",
563                                         diff_get_color_opt(&rev.diffopt, DIFF_COMMIT),
564                                         t->tag,
565                                         diff_get_color_opt(&rev.diffopt, DIFF_RESET));
566                         ret = show_tag_object(o->oid.hash, &rev);
567                         rev.shown_one = 1;
568                         if (ret)
569                                 break;
570                         o = parse_object(t->tagged->oid.hash);
571                         if (!o)
572                                 ret = error(_("Could not read object %s"),
573                                             oid_to_hex(&t->tagged->oid));
574                         objects[i].item = o;
575                         i--;
576                         break;
577                 }
578                 case OBJ_TREE:
579                         if (rev.shown_one)
580                                 putchar('\n');
581                         printf("%stree %s%s\n\n",
582                                         diff_get_color_opt(&rev.diffopt, DIFF_COMMIT),
583                                         name,
584                                         diff_get_color_opt(&rev.diffopt, DIFF_RESET));
585                         read_tree_recursive((struct tree *)o, "", 0, 0, &match_all,
586                                         show_tree_object, NULL);
587                         rev.shown_one = 1;
588                         break;
589                 case OBJ_COMMIT:
590                         rev.pending.nr = rev.pending.alloc = 0;
591                         rev.pending.objects = NULL;
592                         add_object_array(o, name, &rev.pending);
593                         ret = cmd_log_walk(&rev);
594                         break;
595                 default:
596                         ret = error(_("Unknown type: %d"), o->type);
597                 }
598         }
599         free(objects);
600         return ret;
601 }
602
603 /*
604  * This is equivalent to "git log -g --abbrev-commit --pretty=oneline"
605  */
606 int cmd_log_reflog(int argc, const char **argv, const char *prefix)
607 {
608         struct rev_info rev;
609         struct setup_revision_opt opt;
610
611         init_grep_defaults();
612         git_config(git_log_config, NULL);
613
614         init_revisions(&rev, prefix);
615         init_reflog_walk(&rev.reflog_info);
616         rev.verbose_header = 1;
617         memset(&opt, 0, sizeof(opt));
618         opt.def = "HEAD";
619         cmd_log_init_defaults(&rev);
620         rev.abbrev_commit = 1;
621         rev.commit_format = CMIT_FMT_ONELINE;
622         rev.use_terminator = 1;
623         rev.always_show_header = 1;
624         cmd_log_init_finish(argc, argv, prefix, &rev, &opt);
625
626         return cmd_log_walk(&rev);
627 }
628
629 static void log_setup_revisions_tweak(struct rev_info *rev,
630                                       struct setup_revision_opt *opt)
631 {
632         if (DIFF_OPT_TST(&rev->diffopt, DEFAULT_FOLLOW_RENAMES) &&
633             rev->prune_data.nr == 1)
634                 DIFF_OPT_SET(&rev->diffopt, FOLLOW_RENAMES);
635
636         /* Turn --cc/-c into -p --cc/-c when -p was not given */
637         if (!rev->diffopt.output_format && rev->combine_merges)
638                 rev->diffopt.output_format = DIFF_FORMAT_PATCH;
639
640         /* Turn -m on when --cc/-c was given */
641         if (rev->combine_merges)
642                 rev->ignore_merges = 0;
643 }
644
645 int cmd_log(int argc, const char **argv, const char *prefix)
646 {
647         struct rev_info rev;
648         struct setup_revision_opt opt;
649
650         init_grep_defaults();
651         git_config(git_log_config, NULL);
652
653         init_revisions(&rev, prefix);
654         rev.always_show_header = 1;
655         memset(&opt, 0, sizeof(opt));
656         opt.def = "HEAD";
657         opt.revarg_opt = REVARG_COMMITTISH;
658         opt.tweak = log_setup_revisions_tweak;
659         cmd_log_init(argc, argv, prefix, &rev, &opt);
660         return cmd_log_walk(&rev);
661 }
662
663 /* format-patch */
664
665 static const char *fmt_patch_suffix = ".patch";
666 static int numbered = 0;
667 static int auto_number = 1;
668
669 static char *default_attach = NULL;
670
671 static struct string_list extra_hdr;
672 static struct string_list extra_to;
673 static struct string_list extra_cc;
674
675 static void add_header(const char *value)
676 {
677         struct string_list_item *item;
678         int len = strlen(value);
679         while (len && value[len - 1] == '\n')
680                 len--;
681
682         if (!strncasecmp(value, "to: ", 4)) {
683                 item = string_list_append(&extra_to, value + 4);
684                 len -= 4;
685         } else if (!strncasecmp(value, "cc: ", 4)) {
686                 item = string_list_append(&extra_cc, value + 4);
687                 len -= 4;
688         } else {
689                 item = string_list_append(&extra_hdr, value);
690         }
691
692         item->string[len] = '\0';
693 }
694
695 #define THREAD_SHALLOW 1
696 #define THREAD_DEEP 2
697 static int thread;
698 static int do_signoff;
699 static const char *signature = git_version_string;
700 static const char *signature_file;
701 static int config_cover_letter;
702 static const char *config_output_directory;
703
704 enum {
705         COVER_UNSET,
706         COVER_OFF,
707         COVER_ON,
708         COVER_AUTO
709 };
710
711 static int git_format_config(const char *var, const char *value, void *cb)
712 {
713         if (!strcmp(var, "format.headers")) {
714                 if (!value)
715                         die(_("format.headers without value"));
716                 add_header(value);
717                 return 0;
718         }
719         if (!strcmp(var, "format.suffix"))
720                 return git_config_string(&fmt_patch_suffix, var, value);
721         if (!strcmp(var, "format.to")) {
722                 if (!value)
723                         return config_error_nonbool(var);
724                 string_list_append(&extra_to, value);
725                 return 0;
726         }
727         if (!strcmp(var, "format.cc")) {
728                 if (!value)
729                         return config_error_nonbool(var);
730                 string_list_append(&extra_cc, value);
731                 return 0;
732         }
733         if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff") ||
734             !strcmp(var, "color.ui") || !strcmp(var, "diff.submodule")) {
735                 return 0;
736         }
737         if (!strcmp(var, "format.numbered")) {
738                 if (value && !strcasecmp(value, "auto")) {
739                         auto_number = 1;
740                         return 0;
741                 }
742                 numbered = git_config_bool(var, value);
743                 auto_number = auto_number && numbered;
744                 return 0;
745         }
746         if (!strcmp(var, "format.attach")) {
747                 if (value && *value)
748                         default_attach = xstrdup(value);
749                 else
750                         default_attach = xstrdup(git_version_string);
751                 return 0;
752         }
753         if (!strcmp(var, "format.thread")) {
754                 if (value && !strcasecmp(value, "deep")) {
755                         thread = THREAD_DEEP;
756                         return 0;
757                 }
758                 if (value && !strcasecmp(value, "shallow")) {
759                         thread = THREAD_SHALLOW;
760                         return 0;
761                 }
762                 thread = git_config_bool(var, value) && THREAD_SHALLOW;
763                 return 0;
764         }
765         if (!strcmp(var, "format.signoff")) {
766                 do_signoff = git_config_bool(var, value);
767                 return 0;
768         }
769         if (!strcmp(var, "format.signature"))
770                 return git_config_string(&signature, var, value);
771         if (!strcmp(var, "format.signaturefile"))
772                 return git_config_pathname(&signature_file, var, value);
773         if (!strcmp(var, "format.coverletter")) {
774                 if (value && !strcasecmp(value, "auto")) {
775                         config_cover_letter = COVER_AUTO;
776                         return 0;
777                 }
778                 config_cover_letter = git_config_bool(var, value) ? COVER_ON : COVER_OFF;
779                 return 0;
780         }
781         if (!strcmp(var, "format.outputdirectory"))
782                 return git_config_string(&config_output_directory, var, value);
783
784         return git_log_config(var, value, cb);
785 }
786
787 static FILE *realstdout = NULL;
788 static const char *output_directory = NULL;
789 static int outdir_offset;
790
791 static int reopen_stdout(struct commit *commit, const char *subject,
792                          struct rev_info *rev, int quiet)
793 {
794         struct strbuf filename = STRBUF_INIT;
795         int suffix_len = strlen(rev->patch_suffix) + 1;
796
797         if (output_directory) {
798                 strbuf_addstr(&filename, output_directory);
799                 if (filename.len >=
800                     PATH_MAX - FORMAT_PATCH_NAME_MAX - suffix_len)
801                         return error(_("name of output directory is too long"));
802                 strbuf_complete(&filename, '/');
803         }
804
805         if (rev->numbered_files)
806                 strbuf_addf(&filename, "%d", rev->nr);
807         else if (commit)
808                 fmt_output_commit(&filename, commit, rev);
809         else
810                 fmt_output_subject(&filename, subject, rev);
811
812         if (!quiet)
813                 fprintf(realstdout, "%s\n", filename.buf + outdir_offset);
814
815         if (freopen(filename.buf, "w", stdout) == NULL)
816                 return error(_("Cannot open patch file %s"), filename.buf);
817
818         strbuf_release(&filename);
819         return 0;
820 }
821
822 static void get_patch_ids(struct rev_info *rev, struct patch_ids *ids)
823 {
824         struct rev_info check_rev;
825         struct commit *commit, *c1, *c2;
826         struct object *o1, *o2;
827         unsigned flags1, flags2;
828
829         if (rev->pending.nr != 2)
830                 die(_("Need exactly one range."));
831
832         o1 = rev->pending.objects[0].item;
833         o2 = rev->pending.objects[1].item;
834         flags1 = o1->flags;
835         flags2 = o2->flags;
836         c1 = lookup_commit_reference(o1->oid.hash);
837         c2 = lookup_commit_reference(o2->oid.hash);
838
839         if ((flags1 & UNINTERESTING) == (flags2 & UNINTERESTING))
840                 die(_("Not a range."));
841
842         init_patch_ids(ids);
843
844         /* given a range a..b get all patch ids for b..a */
845         init_revisions(&check_rev, rev->prefix);
846         check_rev.max_parents = 1;
847         o1->flags ^= UNINTERESTING;
848         o2->flags ^= UNINTERESTING;
849         add_pending_object(&check_rev, o1, "o1");
850         add_pending_object(&check_rev, o2, "o2");
851         if (prepare_revision_walk(&check_rev))
852                 die(_("revision walk setup failed"));
853
854         while ((commit = get_revision(&check_rev)) != NULL) {
855                 add_commit_patch_id(commit, ids);
856         }
857
858         /* reset for next revision walk */
859         clear_commit_marks(c1, SEEN | UNINTERESTING | SHOWN | ADDED);
860         clear_commit_marks(c2, SEEN | UNINTERESTING | SHOWN | ADDED);
861         o1->flags = flags1;
862         o2->flags = flags2;
863 }
864
865 static void gen_message_id(struct rev_info *info, char *base)
866 {
867         struct strbuf buf = STRBUF_INIT;
868         strbuf_addf(&buf, "%s.%lu.git.%s", base,
869                     (unsigned long) time(NULL),
870                     git_committer_info(IDENT_NO_NAME|IDENT_NO_DATE|IDENT_STRICT));
871         info->message_id = strbuf_detach(&buf, NULL);
872 }
873
874 static void print_signature(void)
875 {
876         if (!signature || !*signature)
877                 return;
878
879         printf("-- \n%s", signature);
880         if (signature[strlen(signature)-1] != '\n')
881                 putchar('\n');
882         putchar('\n');
883 }
884
885 static void add_branch_description(struct strbuf *buf, const char *branch_name)
886 {
887         struct strbuf desc = STRBUF_INIT;
888         if (!branch_name || !*branch_name)
889                 return;
890         read_branch_desc(&desc, branch_name);
891         if (desc.len) {
892                 strbuf_addch(buf, '\n');
893                 strbuf_addbuf(buf, &desc);
894                 strbuf_addch(buf, '\n');
895         }
896         strbuf_release(&desc);
897 }
898
899 static char *find_branch_name(struct rev_info *rev)
900 {
901         int i, positive = -1;
902         struct object_id branch_oid;
903         const struct object_id *tip_oid;
904         const char *ref, *v;
905         char *full_ref, *branch = NULL;
906
907         for (i = 0; i < rev->cmdline.nr; i++) {
908                 if (rev->cmdline.rev[i].flags & UNINTERESTING)
909                         continue;
910                 if (positive < 0)
911                         positive = i;
912                 else
913                         return NULL;
914         }
915         if (positive < 0)
916                 return NULL;
917         ref = rev->cmdline.rev[positive].name;
918         tip_oid = &rev->cmdline.rev[positive].item->oid;
919         if (dwim_ref(ref, strlen(ref), branch_oid.hash, &full_ref) &&
920             skip_prefix(full_ref, "refs/heads/", &v) &&
921             !oidcmp(tip_oid, &branch_oid))
922                 branch = xstrdup(v);
923         free(full_ref);
924         return branch;
925 }
926
927 static void make_cover_letter(struct rev_info *rev, int use_stdout,
928                               struct commit *origin,
929                               int nr, struct commit **list,
930                               const char *branch_name,
931                               int quiet)
932 {
933         const char *committer;
934         const char *body = "*** SUBJECT HERE ***\n\n*** BLURB HERE ***\n";
935         const char *msg;
936         struct shortlog log;
937         struct strbuf sb = STRBUF_INIT;
938         int i;
939         const char *encoding = "UTF-8";
940         struct diff_options opts;
941         int need_8bit_cte = 0;
942         struct pretty_print_context pp = {0};
943         struct commit *head = list[0];
944
945         if (rev->commit_format != CMIT_FMT_EMAIL)
946                 die(_("Cover letter needs email format"));
947
948         committer = git_committer_info(0);
949
950         if (!use_stdout &&
951             reopen_stdout(NULL, rev->numbered_files ? NULL : "cover-letter", rev, quiet))
952                 return;
953
954         log_write_email_headers(rev, head, &pp.subject, &pp.after_subject,
955                                 &need_8bit_cte);
956
957         for (i = 0; !need_8bit_cte && i < nr; i++) {
958                 const char *buf = get_commit_buffer(list[i], NULL);
959                 if (has_non_ascii(buf))
960                         need_8bit_cte = 1;
961                 unuse_commit_buffer(list[i], buf);
962         }
963
964         if (!branch_name)
965                 branch_name = find_branch_name(rev);
966
967         msg = body;
968         pp.fmt = CMIT_FMT_EMAIL;
969         pp.date_mode.type = DATE_RFC2822;
970         pp_user_info(&pp, NULL, &sb, committer, encoding);
971         pp_title_line(&pp, &msg, &sb, encoding, need_8bit_cte);
972         pp_remainder(&pp, &msg, &sb, 0);
973         add_branch_description(&sb, branch_name);
974         printf("%s\n", sb.buf);
975
976         strbuf_release(&sb);
977
978         shortlog_init(&log);
979         log.wrap_lines = 1;
980         log.wrap = 72;
981         log.in1 = 2;
982         log.in2 = 4;
983         for (i = 0; i < nr; i++)
984                 shortlog_add_commit(&log, list[i]);
985
986         shortlog_output(&log);
987
988         /*
989          * We can only do diffstat with a unique reference point
990          */
991         if (!origin)
992                 return;
993
994         memcpy(&opts, &rev->diffopt, sizeof(opts));
995         opts.output_format = DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT;
996
997         diff_setup_done(&opts);
998
999         diff_tree_sha1(origin->tree->object.oid.hash,
1000                        head->tree->object.oid.hash,
1001                        "", &opts);
1002         diffcore_std(&opts);
1003         diff_flush(&opts);
1004
1005         printf("\n");
1006         print_signature();
1007 }
1008
1009 static const char *clean_message_id(const char *msg_id)
1010 {
1011         char ch;
1012         const char *a, *z, *m;
1013
1014         m = msg_id;
1015         while ((ch = *m) && (isspace(ch) || (ch == '<')))
1016                 m++;
1017         a = m;
1018         z = NULL;
1019         while ((ch = *m)) {
1020                 if (!isspace(ch) && (ch != '>'))
1021                         z = m;
1022                 m++;
1023         }
1024         if (!z)
1025                 die(_("insane in-reply-to: %s"), msg_id);
1026         if (++z == m)
1027                 return a;
1028         return xmemdupz(a, z - a);
1029 }
1030
1031 static const char *set_outdir(const char *prefix, const char *output_directory)
1032 {
1033         if (output_directory && is_absolute_path(output_directory))
1034                 return output_directory;
1035
1036         if (!prefix || !*prefix) {
1037                 if (output_directory)
1038                         return output_directory;
1039                 /* The user did not explicitly ask for "./" */
1040                 outdir_offset = 2;
1041                 return "./";
1042         }
1043
1044         outdir_offset = strlen(prefix);
1045         if (!output_directory)
1046                 return prefix;
1047
1048         return xstrdup(prefix_filename(prefix, outdir_offset,
1049                                        output_directory));
1050 }
1051
1052 static const char * const builtin_format_patch_usage[] = {
1053         N_("git format-patch [<options>] [<since> | <revision-range>]"),
1054         NULL
1055 };
1056
1057 static int keep_subject = 0;
1058
1059 static int keep_callback(const struct option *opt, const char *arg, int unset)
1060 {
1061         ((struct rev_info *)opt->value)->total = -1;
1062         keep_subject = 1;
1063         return 0;
1064 }
1065
1066 static int subject_prefix = 0;
1067
1068 static int subject_prefix_callback(const struct option *opt, const char *arg,
1069                             int unset)
1070 {
1071         subject_prefix = 1;
1072         ((struct rev_info *)opt->value)->subject_prefix = arg;
1073         return 0;
1074 }
1075
1076 static int numbered_cmdline_opt = 0;
1077
1078 static int numbered_callback(const struct option *opt, const char *arg,
1079                              int unset)
1080 {
1081         *(int *)opt->value = numbered_cmdline_opt = unset ? 0 : 1;
1082         if (unset)
1083                 auto_number =  0;
1084         return 0;
1085 }
1086
1087 static int no_numbered_callback(const struct option *opt, const char *arg,
1088                                 int unset)
1089 {
1090         return numbered_callback(opt, arg, 1);
1091 }
1092
1093 static int output_directory_callback(const struct option *opt, const char *arg,
1094                               int unset)
1095 {
1096         const char **dir = (const char **)opt->value;
1097         if (*dir)
1098                 die(_("Two output directories?"));
1099         *dir = arg;
1100         return 0;
1101 }
1102
1103 static int thread_callback(const struct option *opt, const char *arg, int unset)
1104 {
1105         int *thread = (int *)opt->value;
1106         if (unset)
1107                 *thread = 0;
1108         else if (!arg || !strcmp(arg, "shallow"))
1109                 *thread = THREAD_SHALLOW;
1110         else if (!strcmp(arg, "deep"))
1111                 *thread = THREAD_DEEP;
1112         else
1113                 return 1;
1114         return 0;
1115 }
1116
1117 static int attach_callback(const struct option *opt, const char *arg, int unset)
1118 {
1119         struct rev_info *rev = (struct rev_info *)opt->value;
1120         if (unset)
1121                 rev->mime_boundary = NULL;
1122         else if (arg)
1123                 rev->mime_boundary = arg;
1124         else
1125                 rev->mime_boundary = git_version_string;
1126         rev->no_inline = unset ? 0 : 1;
1127         return 0;
1128 }
1129
1130 static int inline_callback(const struct option *opt, const char *arg, int unset)
1131 {
1132         struct rev_info *rev = (struct rev_info *)opt->value;
1133         if (unset)
1134                 rev->mime_boundary = NULL;
1135         else if (arg)
1136                 rev->mime_boundary = arg;
1137         else
1138                 rev->mime_boundary = git_version_string;
1139         rev->no_inline = 0;
1140         return 0;
1141 }
1142
1143 static int header_callback(const struct option *opt, const char *arg, int unset)
1144 {
1145         if (unset) {
1146                 string_list_clear(&extra_hdr, 0);
1147                 string_list_clear(&extra_to, 0);
1148                 string_list_clear(&extra_cc, 0);
1149         } else {
1150             add_header(arg);
1151         }
1152         return 0;
1153 }
1154
1155 static int to_callback(const struct option *opt, const char *arg, int unset)
1156 {
1157         if (unset)
1158                 string_list_clear(&extra_to, 0);
1159         else
1160                 string_list_append(&extra_to, arg);
1161         return 0;
1162 }
1163
1164 static int cc_callback(const struct option *opt, const char *arg, int unset)
1165 {
1166         if (unset)
1167                 string_list_clear(&extra_cc, 0);
1168         else
1169                 string_list_append(&extra_cc, arg);
1170         return 0;
1171 }
1172
1173 static int from_callback(const struct option *opt, const char *arg, int unset)
1174 {
1175         char **from = opt->value;
1176
1177         free(*from);
1178
1179         if (unset)
1180                 *from = NULL;
1181         else if (arg)
1182                 *from = xstrdup(arg);
1183         else
1184                 *from = xstrdup(git_committer_info(IDENT_NO_DATE));
1185         return 0;
1186 }
1187
1188 int cmd_format_patch(int argc, const char **argv, const char *prefix)
1189 {
1190         struct commit *commit;
1191         struct commit **list = NULL;
1192         struct rev_info rev;
1193         struct setup_revision_opt s_r_opt;
1194         int nr = 0, total, i;
1195         int use_stdout = 0;
1196         int start_number = -1;
1197         int just_numbers = 0;
1198         int ignore_if_in_upstream = 0;
1199         int cover_letter = -1;
1200         int boundary_count = 0;
1201         int no_binary_diff = 0;
1202         int zero_commit = 0;
1203         struct commit *origin = NULL;
1204         const char *in_reply_to = NULL;
1205         struct patch_ids ids;
1206         struct strbuf buf = STRBUF_INIT;
1207         int use_patch_format = 0;
1208         int quiet = 0;
1209         int reroll_count = -1;
1210         char *branch_name = NULL;
1211         char *from = NULL;
1212         const struct option builtin_format_patch_options[] = {
1213                 { OPTION_CALLBACK, 'n', "numbered", &numbered, NULL,
1214                             N_("use [PATCH n/m] even with a single patch"),
1215                             PARSE_OPT_NOARG, numbered_callback },
1216                 { OPTION_CALLBACK, 'N', "no-numbered", &numbered, NULL,
1217                             N_("use [PATCH] even with multiple patches"),
1218                             PARSE_OPT_NOARG, no_numbered_callback },
1219                 OPT_BOOL('s', "signoff", &do_signoff, N_("add Signed-off-by:")),
1220                 OPT_BOOL(0, "stdout", &use_stdout,
1221                             N_("print patches to standard out")),
1222                 OPT_BOOL(0, "cover-letter", &cover_letter,
1223                             N_("generate a cover letter")),
1224                 OPT_BOOL(0, "numbered-files", &just_numbers,
1225                             N_("use simple number sequence for output file names")),
1226                 OPT_STRING(0, "suffix", &fmt_patch_suffix, N_("sfx"),
1227                             N_("use <sfx> instead of '.patch'")),
1228                 OPT_INTEGER(0, "start-number", &start_number,
1229                             N_("start numbering patches at <n> instead of 1")),
1230                 OPT_INTEGER('v', "reroll-count", &reroll_count,
1231                             N_("mark the series as Nth re-roll")),
1232                 { OPTION_CALLBACK, 0, "subject-prefix", &rev, N_("prefix"),
1233                             N_("Use [<prefix>] instead of [PATCH]"),
1234                             PARSE_OPT_NONEG, subject_prefix_callback },
1235                 { OPTION_CALLBACK, 'o', "output-directory", &output_directory,
1236                             N_("dir"), N_("store resulting files in <dir>"),
1237                             PARSE_OPT_NONEG, output_directory_callback },
1238                 { OPTION_CALLBACK, 'k', "keep-subject", &rev, NULL,
1239                             N_("don't strip/add [PATCH]"),
1240                             PARSE_OPT_NOARG | PARSE_OPT_NONEG, keep_callback },
1241                 OPT_BOOL(0, "no-binary", &no_binary_diff,
1242                          N_("don't output binary diffs")),
1243                 OPT_BOOL(0, "zero-commit", &zero_commit,
1244                          N_("output all-zero hash in From header")),
1245                 OPT_BOOL(0, "ignore-if-in-upstream", &ignore_if_in_upstream,
1246                          N_("don't include a patch matching a commit upstream")),
1247                 { OPTION_SET_INT, 'p', "no-stat", &use_patch_format, NULL,
1248                   N_("show patch format instead of default (patch + stat)"),
1249                   PARSE_OPT_NONEG | PARSE_OPT_NOARG, NULL, 1},
1250                 OPT_GROUP(N_("Messaging")),
1251                 { OPTION_CALLBACK, 0, "add-header", NULL, N_("header"),
1252                             N_("add email header"), 0, header_callback },
1253                 { OPTION_CALLBACK, 0, "to", NULL, N_("email"), N_("add To: header"),
1254                             0, to_callback },
1255                 { OPTION_CALLBACK, 0, "cc", NULL, N_("email"), N_("add Cc: header"),
1256                             0, cc_callback },
1257                 { OPTION_CALLBACK, 0, "from", &from, N_("ident"),
1258                             N_("set From address to <ident> (or committer ident if absent)"),
1259                             PARSE_OPT_OPTARG, from_callback },
1260                 OPT_STRING(0, "in-reply-to", &in_reply_to, N_("message-id"),
1261                             N_("make first mail a reply to <message-id>")),
1262                 { OPTION_CALLBACK, 0, "attach", &rev, N_("boundary"),
1263                             N_("attach the patch"), PARSE_OPT_OPTARG,
1264                             attach_callback },
1265                 { OPTION_CALLBACK, 0, "inline", &rev, N_("boundary"),
1266                             N_("inline the patch"),
1267                             PARSE_OPT_OPTARG | PARSE_OPT_NONEG,
1268                             inline_callback },
1269                 { OPTION_CALLBACK, 0, "thread", &thread, N_("style"),
1270                             N_("enable message threading, styles: shallow, deep"),
1271                             PARSE_OPT_OPTARG, thread_callback },
1272                 OPT_STRING(0, "signature", &signature, N_("signature"),
1273                             N_("add a signature")),
1274                 OPT_FILENAME(0, "signature-file", &signature_file,
1275                                 N_("add a signature from a file")),
1276                 OPT__QUIET(&quiet, N_("don't print the patch filenames")),
1277                 OPT_END()
1278         };
1279
1280         extra_hdr.strdup_strings = 1;
1281         extra_to.strdup_strings = 1;
1282         extra_cc.strdup_strings = 1;
1283         init_grep_defaults();
1284         git_config(git_format_config, NULL);
1285         init_revisions(&rev, prefix);
1286         rev.commit_format = CMIT_FMT_EMAIL;
1287         rev.verbose_header = 1;
1288         rev.diff = 1;
1289         rev.max_parents = 1;
1290         DIFF_OPT_SET(&rev.diffopt, RECURSIVE);
1291         rev.subject_prefix = fmt_patch_subject_prefix;
1292         memset(&s_r_opt, 0, sizeof(s_r_opt));
1293         s_r_opt.def = "HEAD";
1294         s_r_opt.revarg_opt = REVARG_COMMITTISH;
1295
1296         if (default_attach) {
1297                 rev.mime_boundary = default_attach;
1298                 rev.no_inline = 1;
1299         }
1300
1301         /*
1302          * Parse the arguments before setup_revisions(), or something
1303          * like "git format-patch -o a123 HEAD^.." may fail; a123 is
1304          * possibly a valid SHA1.
1305          */
1306         argc = parse_options(argc, argv, prefix, builtin_format_patch_options,
1307                              builtin_format_patch_usage,
1308                              PARSE_OPT_KEEP_ARGV0 | PARSE_OPT_KEEP_UNKNOWN |
1309                              PARSE_OPT_KEEP_DASHDASH);
1310
1311         if (0 < reroll_count) {
1312                 struct strbuf sprefix = STRBUF_INIT;
1313                 strbuf_addf(&sprefix, "%s v%d",
1314                             rev.subject_prefix, reroll_count);
1315                 rev.reroll_count = reroll_count;
1316                 rev.subject_prefix = strbuf_detach(&sprefix, NULL);
1317         }
1318
1319         for (i = 0; i < extra_hdr.nr; i++) {
1320                 strbuf_addstr(&buf, extra_hdr.items[i].string);
1321                 strbuf_addch(&buf, '\n');
1322         }
1323
1324         if (extra_to.nr)
1325                 strbuf_addstr(&buf, "To: ");
1326         for (i = 0; i < extra_to.nr; i++) {
1327                 if (i)
1328                         strbuf_addstr(&buf, "    ");
1329                 strbuf_addstr(&buf, extra_to.items[i].string);
1330                 if (i + 1 < extra_to.nr)
1331                         strbuf_addch(&buf, ',');
1332                 strbuf_addch(&buf, '\n');
1333         }
1334
1335         if (extra_cc.nr)
1336                 strbuf_addstr(&buf, "Cc: ");
1337         for (i = 0; i < extra_cc.nr; i++) {
1338                 if (i)
1339                         strbuf_addstr(&buf, "    ");
1340                 strbuf_addstr(&buf, extra_cc.items[i].string);
1341                 if (i + 1 < extra_cc.nr)
1342                         strbuf_addch(&buf, ',');
1343                 strbuf_addch(&buf, '\n');
1344         }
1345
1346         rev.extra_headers = strbuf_detach(&buf, NULL);
1347
1348         if (from) {
1349                 if (split_ident_line(&rev.from_ident, from, strlen(from)))
1350                         die(_("invalid ident line: %s"), from);
1351         }
1352
1353         if (start_number < 0)
1354                 start_number = 1;
1355
1356         /*
1357          * If numbered is set solely due to format.numbered in config,
1358          * and it would conflict with --keep-subject (-k) from the
1359          * command line, reset "numbered".
1360          */
1361         if (numbered && keep_subject && !numbered_cmdline_opt)
1362                 numbered = 0;
1363
1364         if (numbered && keep_subject)
1365                 die (_("-n and -k are mutually exclusive."));
1366         if (keep_subject && subject_prefix)
1367                 die (_("--subject-prefix and -k are mutually exclusive."));
1368         rev.preserve_subject = keep_subject;
1369
1370         argc = setup_revisions(argc, argv, &rev, &s_r_opt);
1371         if (argc > 1)
1372                 die (_("unrecognized argument: %s"), argv[1]);
1373
1374         if (rev.diffopt.output_format & DIFF_FORMAT_NAME)
1375                 die(_("--name-only does not make sense"));
1376         if (rev.diffopt.output_format & DIFF_FORMAT_NAME_STATUS)
1377                 die(_("--name-status does not make sense"));
1378         if (rev.diffopt.output_format & DIFF_FORMAT_CHECKDIFF)
1379                 die(_("--check does not make sense"));
1380
1381         if (!use_patch_format &&
1382                 (!rev.diffopt.output_format ||
1383                  rev.diffopt.output_format == DIFF_FORMAT_PATCH))
1384                 rev.diffopt.output_format = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_SUMMARY;
1385
1386         /* Always generate a patch */
1387         rev.diffopt.output_format |= DIFF_FORMAT_PATCH;
1388
1389         rev.zero_commit = zero_commit;
1390
1391         if (!DIFF_OPT_TST(&rev.diffopt, TEXT) && !no_binary_diff)
1392                 DIFF_OPT_SET(&rev.diffopt, BINARY);
1393
1394         if (rev.show_notes)
1395                 init_display_notes(&rev.notes_opt);
1396
1397         if (!output_directory && !use_stdout)
1398                 output_directory = config_output_directory;
1399
1400         if (!use_stdout)
1401                 output_directory = set_outdir(prefix, output_directory);
1402         else
1403                 setup_pager();
1404
1405         if (output_directory) {
1406                 if (use_stdout)
1407                         die(_("standard output, or directory, which one?"));
1408                 if (mkdir(output_directory, 0777) < 0 && errno != EEXIST)
1409                         die_errno(_("Could not create directory '%s'"),
1410                                   output_directory);
1411         }
1412
1413         if (rev.pending.nr == 1) {
1414                 int check_head = 0;
1415
1416                 if (rev.max_count < 0 && !rev.show_root_diff) {
1417                         /*
1418                          * This is traditional behaviour of "git format-patch
1419                          * origin" that prepares what the origin side still
1420                          * does not have.
1421                          */
1422                         rev.pending.objects[0].item->flags |= UNINTERESTING;
1423                         add_head_to_pending(&rev);
1424                         check_head = 1;
1425                 }
1426                 /*
1427                  * Otherwise, it is "format-patch -22 HEAD", and/or
1428                  * "format-patch --root HEAD".  The user wants
1429                  * get_revision() to do the usual traversal.
1430                  */
1431
1432                 if (!strcmp(rev.pending.objects[0].name, "HEAD"))
1433                         check_head = 1;
1434
1435                 if (check_head) {
1436                         unsigned char sha1[20];
1437                         const char *ref, *v;
1438                         ref = resolve_ref_unsafe("HEAD", RESOLVE_REF_READING,
1439                                                  sha1, NULL);
1440                         if (ref && skip_prefix(ref, "refs/heads/", &v))
1441                                 branch_name = xstrdup(v);
1442                         else
1443                                 branch_name = xstrdup(""); /* no branch */
1444                 }
1445         }
1446
1447         /*
1448          * We cannot move this anywhere earlier because we do want to
1449          * know if --root was given explicitly from the command line.
1450          */
1451         rev.show_root_diff = 1;
1452
1453         if (ignore_if_in_upstream) {
1454                 /* Don't say anything if head and upstream are the same. */
1455                 if (rev.pending.nr == 2) {
1456                         struct object_array_entry *o = rev.pending.objects;
1457                         if (oidcmp(&o[0].item->oid, &o[1].item->oid) == 0)
1458                                 return 0;
1459                 }
1460                 get_patch_ids(&rev, &ids);
1461         }
1462
1463         if (!use_stdout)
1464                 realstdout = xfdopen(xdup(1), "w");
1465
1466         if (prepare_revision_walk(&rev))
1467                 die(_("revision walk setup failed"));
1468         rev.boundary = 1;
1469         while ((commit = get_revision(&rev)) != NULL) {
1470                 if (commit->object.flags & BOUNDARY) {
1471                         boundary_count++;
1472                         origin = (boundary_count == 1) ? commit : NULL;
1473                         continue;
1474                 }
1475
1476                 if (ignore_if_in_upstream && has_commit_patch_id(commit, &ids))
1477                         continue;
1478
1479                 nr++;
1480                 REALLOC_ARRAY(list, nr);
1481                 list[nr - 1] = commit;
1482         }
1483         if (nr == 0)
1484                 /* nothing to do */
1485                 return 0;
1486         total = nr;
1487         if (!keep_subject && auto_number && total > 1)
1488                 numbered = 1;
1489         if (numbered)
1490                 rev.total = total + start_number - 1;
1491         if (cover_letter == -1) {
1492                 if (config_cover_letter == COVER_AUTO)
1493                         cover_letter = (total > 1);
1494                 else
1495                         cover_letter = (config_cover_letter == COVER_ON);
1496         }
1497
1498         if (!signature) {
1499                 ; /* --no-signature inhibits all signatures */
1500         } else if (signature && signature != git_version_string) {
1501                 ; /* non-default signature already set */
1502         } else if (signature_file) {
1503                 struct strbuf buf = STRBUF_INIT;
1504
1505                 if (strbuf_read_file(&buf, signature_file, 128) < 0)
1506                         die_errno(_("unable to read signature file '%s'"), signature_file);
1507                 signature = strbuf_detach(&buf, NULL);
1508         }
1509
1510         if (in_reply_to || thread || cover_letter)
1511                 rev.ref_message_ids = xcalloc(1, sizeof(struct string_list));
1512         if (in_reply_to) {
1513                 const char *msgid = clean_message_id(in_reply_to);
1514                 string_list_append(rev.ref_message_ids, msgid);
1515         }
1516         rev.numbered_files = just_numbers;
1517         rev.patch_suffix = fmt_patch_suffix;
1518         if (cover_letter) {
1519                 if (thread)
1520                         gen_message_id(&rev, "cover");
1521                 make_cover_letter(&rev, use_stdout,
1522                                   origin, nr, list, branch_name, quiet);
1523                 total++;
1524                 start_number--;
1525         }
1526         rev.add_signoff = do_signoff;
1527         while (0 <= --nr) {
1528                 int shown;
1529                 commit = list[nr];
1530                 rev.nr = total - nr + (start_number - 1);
1531                 /* Make the second and subsequent mails replies to the first */
1532                 if (thread) {
1533                         /* Have we already had a message ID? */
1534                         if (rev.message_id) {
1535                                 /*
1536                                  * For deep threading: make every mail
1537                                  * a reply to the previous one, no
1538                                  * matter what other options are set.
1539                                  *
1540                                  * For shallow threading:
1541                                  *
1542                                  * Without --cover-letter and
1543                                  * --in-reply-to, make every mail a
1544                                  * reply to the one before.
1545                                  *
1546                                  * With --in-reply-to but no
1547                                  * --cover-letter, make every mail a
1548                                  * reply to the <reply-to>.
1549                                  *
1550                                  * With --cover-letter, make every
1551                                  * mail but the cover letter a reply
1552                                  * to the cover letter.  The cover
1553                                  * letter is a reply to the
1554                                  * --in-reply-to, if specified.
1555                                  */
1556                                 if (thread == THREAD_SHALLOW
1557                                     && rev.ref_message_ids->nr > 0
1558                                     && (!cover_letter || rev.nr > 1))
1559                                         free(rev.message_id);
1560                                 else
1561                                         string_list_append(rev.ref_message_ids,
1562                                                            rev.message_id);
1563                         }
1564                         gen_message_id(&rev, oid_to_hex(&commit->object.oid));
1565                 }
1566
1567                 if (!use_stdout &&
1568                     reopen_stdout(rev.numbered_files ? NULL : commit, NULL, &rev, quiet))
1569                         die(_("Failed to create output files"));
1570                 shown = log_tree_commit(&rev, commit);
1571                 free_commit_buffer(commit);
1572
1573                 /* We put one extra blank line between formatted
1574                  * patches and this flag is used by log-tree code
1575                  * to see if it needs to emit a LF before showing
1576                  * the log; when using one file per patch, we do
1577                  * not want the extra blank line.
1578                  */
1579                 if (!use_stdout)
1580                         rev.shown_one = 0;
1581                 if (shown) {
1582                         if (rev.mime_boundary)
1583                                 printf("\n--%s%s--\n\n\n",
1584                                        mime_boundary_leader,
1585                                        rev.mime_boundary);
1586                         else
1587                                 print_signature();
1588                 }
1589                 if (!use_stdout)
1590                         fclose(stdout);
1591         }
1592         free(list);
1593         free(branch_name);
1594         string_list_clear(&extra_to, 0);
1595         string_list_clear(&extra_cc, 0);
1596         string_list_clear(&extra_hdr, 0);
1597         if (ignore_if_in_upstream)
1598                 free_patch_ids(&ids);
1599         return 0;
1600 }
1601
1602 static int add_pending_commit(const char *arg, struct rev_info *revs, int flags)
1603 {
1604         unsigned char sha1[20];
1605         if (get_sha1(arg, sha1) == 0) {
1606                 struct commit *commit = lookup_commit_reference(sha1);
1607                 if (commit) {
1608                         commit->object.flags |= flags;
1609                         add_pending_object(revs, &commit->object, arg);
1610                         return 0;
1611                 }
1612         }
1613         return -1;
1614 }
1615
1616 static const char * const cherry_usage[] = {
1617         N_("git cherry [-v] [<upstream> [<head> [<limit>]]]"),
1618         NULL
1619 };
1620
1621 static void print_commit(char sign, struct commit *commit, int verbose,
1622                          int abbrev)
1623 {
1624         if (!verbose) {
1625                 printf("%c %s\n", sign,
1626                        find_unique_abbrev(commit->object.oid.hash, abbrev));
1627         } else {
1628                 struct strbuf buf = STRBUF_INIT;
1629                 pp_commit_easy(CMIT_FMT_ONELINE, commit, &buf);
1630                 printf("%c %s %s\n", sign,
1631                        find_unique_abbrev(commit->object.oid.hash, abbrev),
1632                        buf.buf);
1633                 strbuf_release(&buf);
1634         }
1635 }
1636
1637 int cmd_cherry(int argc, const char **argv, const char *prefix)
1638 {
1639         struct rev_info revs;
1640         struct patch_ids ids;
1641         struct commit *commit;
1642         struct commit_list *list = NULL;
1643         struct branch *current_branch;
1644         const char *upstream;
1645         const char *head = "HEAD";
1646         const char *limit = NULL;
1647         int verbose = 0, abbrev = 0;
1648
1649         struct option options[] = {
1650                 OPT__ABBREV(&abbrev),
1651                 OPT__VERBOSE(&verbose, N_("be verbose")),
1652                 OPT_END()
1653         };
1654
1655         argc = parse_options(argc, argv, prefix, options, cherry_usage, 0);
1656
1657         switch (argc) {
1658         case 3:
1659                 limit = argv[2];
1660                 /* FALLTHROUGH */
1661         case 2:
1662                 head = argv[1];
1663                 /* FALLTHROUGH */
1664         case 1:
1665                 upstream = argv[0];
1666                 break;
1667         default:
1668                 current_branch = branch_get(NULL);
1669                 upstream = branch_get_upstream(current_branch, NULL);
1670                 if (!upstream) {
1671                         fprintf(stderr, _("Could not find a tracked"
1672                                         " remote branch, please"
1673                                         " specify <upstream> manually.\n"));
1674                         usage_with_options(cherry_usage, options);
1675                 }
1676         }
1677
1678         init_revisions(&revs, prefix);
1679         revs.max_parents = 1;
1680
1681         if (add_pending_commit(head, &revs, 0))
1682                 die(_("Unknown commit %s"), head);
1683         if (add_pending_commit(upstream, &revs, UNINTERESTING))
1684                 die(_("Unknown commit %s"), upstream);
1685
1686         /* Don't say anything if head and upstream are the same. */
1687         if (revs.pending.nr == 2) {
1688                 struct object_array_entry *o = revs.pending.objects;
1689                 if (oidcmp(&o[0].item->oid, &o[1].item->oid) == 0)
1690                         return 0;
1691         }
1692
1693         get_patch_ids(&revs, &ids);
1694
1695         if (limit && add_pending_commit(limit, &revs, UNINTERESTING))
1696                 die(_("Unknown commit %s"), limit);
1697
1698         /* reverse the list of commits */
1699         if (prepare_revision_walk(&revs))
1700                 die(_("revision walk setup failed"));
1701         while ((commit = get_revision(&revs)) != NULL) {
1702                 commit_list_insert(commit, &list);
1703         }
1704
1705         while (list) {
1706                 char sign = '+';
1707
1708                 commit = list->item;
1709                 if (has_commit_patch_id(commit, &ids))
1710                         sign = '-';
1711                 print_commit(sign, commit, verbose, abbrev);
1712                 list = list->next;
1713         }
1714
1715         free_patch_ids(&ids);
1716         return 0;
1717 }