summaryrefslogtreecommitdiff
path: root/builtin-log.c
blob: 75d698f0cef491b2c7fdc4920b37cb8e61da5e20 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
/*
 * Builtin "git log" and related commands (show, whatchanged)
 *
 * (C) Copyright 2006 Linus Torvalds
 *		 2006 Junio Hamano
 */
#include "cache.h"
#include "color.h"
#include "commit.h"
#include "diff.h"
#include "revision.h"
#include "log-tree.h"
#include "builtin.h"
#include "tag.h"
#include "reflog-walk.h"
#include "patch-ids.h"
#include "run-command.h"
#include "shortlog.h"

/* Set a default date-time format for git log ("log.date" config variable) */
static const char *default_date_mode = NULL;

static int default_show_root = 1;
static const char *fmt_patch_subject_prefix = "PATCH";
static const char *fmt_pretty;

static void cmd_log_init(int argc, const char **argv, const char *prefix,
		      struct rev_info *rev)
{
	int i;
	int decorate = 0;

	rev->abbrev = DEFAULT_ABBREV;
	rev->commit_format = CMIT_FMT_DEFAULT;
	if (fmt_pretty)
		get_commit_format(fmt_pretty, rev);
	rev->verbose_header = 1;
	DIFF_OPT_SET(&rev->diffopt, RECURSIVE);
	rev->show_root_diff = default_show_root;
	rev->subject_prefix = fmt_patch_subject_prefix;

	if (default_date_mode)
		rev->date_mode = parse_date_format(default_date_mode);

	argc = setup_revisions(argc, argv, rev, "HEAD");

	if (rev->diffopt.pickaxe || rev->diffopt.filter)
		rev->always_show_header = 0;
	if (DIFF_OPT_TST(&rev->diffopt, FOLLOW_RENAMES)) {
		rev->always_show_header = 0;
		if (rev->diffopt.nr_paths != 1)
			usage("git logs can only follow renames on one pathname at a time");
	}
	for (i = 1; i < argc; i++) {
		const char *arg = argv[i];
		if (!strcmp(arg, "--decorate")) {
			load_ref_decorations();
			decorate = 1;
		} else
			die("unrecognized argument: %s", arg);
	}
	DIFF_OPT_SET(&rev->diffopt, ALLOW_TEXTCONV);
}

/*
 * This gives a rough estimate for how many commits we
 * will print out in the list.
 */
static int estimate_commit_count(struct rev_info *rev, struct commit_list *list)
{
	int n = 0;

	while (list) {
		struct commit *commit = list->item;
		unsigned int flags = commit->object.flags;
		list = list->next;
		if (!(flags & (TREESAME | UNINTERESTING)))
			n++;
	}
	return n;
}

static void show_early_header(struct rev_info *rev, const char *stage, int nr)
{
	if (rev->shown_one) {
		rev->shown_one = 0;
		if (rev->commit_format != CMIT_FMT_ONELINE)
			putchar(rev->diffopt.line_termination);
	}
	printf("Final output: %d %s\n", nr, stage);
}

struct itimerval early_output_timer;

static void log_show_early(struct rev_info *revs, struct commit_list *list)
{
	int i = revs->early_output;
	int show_header = 1;

	sort_in_topological_order(&list, revs->lifo);
	while (list && i) {
		struct commit *commit = list->item;
		switch (simplify_commit(revs, commit)) {
		case commit_show:
			if (show_header) {
				int n = estimate_commit_count(revs, list);
				show_early_header(revs, "incomplete", n);
				show_header = 0;
			}
			log_tree_commit(revs, commit);
			i--;
			break;
		case commit_ignore:
			break;
		case commit_error:
			return;
		}
		list = list->next;
	}

	/* Did we already get enough commits for the early output? */
	if (!i)
		return;

	/*
	 * ..if no, then repeat it twice a second until we
	 * do.
	 *
	 * NOTE! We don't use "it_interval", because if the
	 * reader isn't listening, we want our output to be
	 * throttled by the writing, and not have the timer
	 * trigger every second even if we're blocked on a
	 * reader!
	 */
	early_output_timer.it_value.tv_sec = 0;
	early_output_timer.it_value.tv_usec = 500000;
	setitimer(ITIMER_REAL, &early_output_timer, NULL);
}

static void early_output(int signal)
{
	show_early_output = log_show_early;
}

static void setup_early_output(struct rev_info *rev)
{
	struct sigaction sa;

	/*
	 * Set up the signal handler, minimally intrusively:
	 * we only set a single volatile integer word (not
	 * using sigatomic_t - trying to avoid unnecessary
	 * system dependencies and headers), and using
	 * SA_RESTART.
	 */
	memset(&sa, 0, sizeof(sa));
	sa.sa_handler = early_output;
	sigemptyset(&sa.sa_mask);
	sa.sa_flags = SA_RESTART;
	sigaction(SIGALRM, &sa, NULL);

	/*
	 * If we can get the whole output in less than a
	 * tenth of a second, don't even bother doing the
	 * early-output thing..
	 *
	 * This is a one-time-only trigger.
	 */
	early_output_timer.it_value.tv_sec = 0;
	early_output_timer.it_value.tv_usec = 100000;
	setitimer(ITIMER_REAL, &early_output_timer, NULL);
}

static void finish_early_output(struct rev_info *rev)
{
	int n = estimate_commit_count(rev, rev->commits);
	signal(SIGALRM, SIG_IGN);
	show_early_header(rev, "done", n);
}

static int cmd_log_walk(struct rev_info *rev)
{
	struct commit *commit;

	if (rev->early_output)
		setup_early_output(rev);

	if (prepare_revision_walk(rev))
		die("revision walk setup failed");

	if (rev->early_output)
		finish_early_output(rev);

	/*
	 * For --check and --exit-code, the exit code is based on CHECK_FAILED
	 * and HAS_CHANGES being accumulated in rev->diffopt, so be careful to
	 * retain that state information if replacing rev->diffopt in this loop
	 */
	while ((commit = get_revision(rev)) != NULL) {
		log_tree_commit(rev, commit);
		if (!rev->reflog_info) {
			/* we allow cycles in reflog ancestry */
			free(commit->buffer);
			commit->buffer = NULL;
		}
		free_commit_list(commit->parents);
		commit->parents = NULL;
	}
	if (rev->diffopt.output_format & DIFF_FORMAT_CHECKDIFF &&
	    DIFF_OPT_TST(&rev->diffopt, CHECK_FAILED)) {
		return 02;
	}
	return diff_result_code(&rev->diffopt, 0);
}

static int git_log_config(const char *var, const char *value, void *cb)
{
	if (!strcmp(var, "format.pretty"))
		return git_config_string(&fmt_pretty, var, value);
	if (!strcmp(var, "format.subjectprefix"))
		return git_config_string(&fmt_patch_subject_prefix, var, value);
	if (!strcmp(var, "log.date"))
		return git_config_string(&default_date_mode, var, value);
	if (!strcmp(var, "log.showroot")) {
		default_show_root = git_config_bool(var, value);
		return 0;
	}
	return git_diff_ui_config(var, value, cb);
}

int cmd_whatchanged(int argc, const char **argv, const char *prefix)
{
	struct rev_info rev;

	git_config(git_log_config, NULL);

	if (diff_use_color_default == -1)
		diff_use_color_default = git_use_color_default;

	init_revisions(&rev, prefix);
	rev.diff = 1;
	rev.simplify_history = 0;
	cmd_log_init(argc, argv, prefix, &rev);
	if (!rev.diffopt.output_format)
		rev.diffopt.output_format = DIFF_FORMAT_RAW;
	return cmd_log_walk(&rev);
}

static void show_tagger(char *buf, int len, struct rev_info *rev)
{
	char *email_end, *p;
	unsigned long date;
	int tz;

	email_end = memchr(buf, '>', len);
	if (!email_end)
		return;
	p = ++email_end;
	while (isspace(*p))
		p++;
	date = strtoul(p, &p, 10);
	while (isspace(*p))
		p++;
	tz = (int)strtol(p, NULL, 10);
	printf("Tagger: %.*s\nDate:   %s\n", (int)(email_end - buf), buf,
	       show_date(date, tz, rev->date_mode));
}

static int show_object(const unsigned char *sha1, int show_tag_object,
	struct rev_info *rev)
{
	unsigned long size;
	enum object_type type;
	char *buf = read_sha1_file(sha1, &type, &size);
	int offset = 0;

	if (!buf)
		return error("Could not read object %s", sha1_to_hex(sha1));

	if (show_tag_object)
		while (offset < size && buf[offset] != '\n') {
			int new_offset = offset + 1;
			while (new_offset < size && buf[new_offset++] != '\n')
				; /* do nothing */
			if (!prefixcmp(buf + offset, "tagger "))
				show_tagger(buf + offset + 7,
					    new_offset - offset - 7, rev);
			offset = new_offset;
		}

	if (offset < size)
		fwrite(buf + offset, size - offset, 1, stdout);
	free(buf);
	return 0;
}

static int show_tree_object(const unsigned char *sha1,
		const char *base, int baselen,
		const char *pathname, unsigned mode, int stage, void *context)
{
	printf("%s%s\n", pathname, S_ISDIR(mode) ? "/" : "");
	return 0;
}

int cmd_show(int argc, const char **argv, const char *prefix)
{
	struct rev_info rev;
	struct object_array_entry *objects;
	int i, count, ret = 0;

	git_config(git_log_config, NULL);

	if (diff_use_color_default == -1)
		diff_use_color_default = git_use_color_default;

	init_revisions(&rev, prefix);
	rev.diff = 1;
	rev.combine_merges = 1;
	rev.dense_combined_merges = 1;
	rev.always_show_header = 1;
	rev.ignore_merges = 0;
	rev.no_walk = 1;
	cmd_log_init(argc, argv, prefix, &rev);

	count = rev.pending.nr;
	objects = rev.pending.objects;
	for (i = 0; i < count && !ret; i++) {
		struct object *o = objects[i].item;
		const char *name = objects[i].name;
		switch (o->type) {
		case OBJ_BLOB:
			ret = show_object(o->sha1, 0, NULL);
			break;
		case OBJ_TAG: {
			struct tag *t = (struct tag *)o;

			printf("%stag %s%s\n",
					diff_get_color_opt(&rev.diffopt, DIFF_COMMIT),
					t->tag,
					diff_get_color_opt(&rev.diffopt, DIFF_RESET));
			ret = show_object(o->sha1, 1, &rev);
			objects[i].item = parse_object(t->tagged->sha1);
			i--;
			break;
		}
		case OBJ_TREE:
			printf("%stree %s%s\n\n",
					diff_get_color_opt(&rev.diffopt, DIFF_COMMIT),
					name,
					diff_get_color_opt(&rev.diffopt, DIFF_RESET));
			read_tree_recursive((struct tree *)o, "", 0, 0, NULL,
					show_tree_object, NULL);
			break;
		case OBJ_COMMIT:
			rev.pending.nr = rev.pending.alloc = 0;
			rev.pending.objects = NULL;
			add_object_array(o, name, &rev.pending);
			ret = cmd_log_walk(&rev);
			break;
		default:
			ret = error("Unknown type: %d", o->type);
		}
	}
	free(objects);
	return ret;
}

/*
 * This is equivalent to "git log -g --abbrev-commit --pretty=oneline"
 */
int cmd_log_reflog(int argc, const char **argv, const char *prefix)
{
	struct rev_info rev;

	git_config(git_log_config, NULL);

	if (diff_use_color_default == -1)
		diff_use_color_default = git_use_color_default;

	init_revisions(&rev, prefix);
	init_reflog_walk(&rev.reflog_info);
	rev.abbrev_commit = 1;
	rev.verbose_header = 1;
	cmd_log_init(argc, argv, prefix, &rev);

	/*
	 * This means that we override whatever commit format the user gave
	 * on the cmd line.  Sad, but cmd_log_init() currently doesn't
	 * allow us to set a different default.
	 */
	rev.commit_format = CMIT_FMT_ONELINE;
	rev.use_terminator = 1;
	rev.always_show_header = 1;

	/*
	 * We get called through "git reflog", so unlike the other log
	 * routines, we need to set up our pager manually..
	 */
	setup_pager();

	return cmd_log_walk(&rev);
}

int cmd_log(int argc, const char **argv, const char *prefix)
{
	struct rev_info rev;

	git_config(git_log_config, NULL);

	if (diff_use_color_default == -1)
		diff_use_color_default = git_use_color_default;

	init_revisions(&rev, prefix);
	rev.always_show_header = 1;
	cmd_log_init(argc, argv, prefix, &rev);
	return cmd_log_walk(&rev);
}

/* format-patch */
#define FORMAT_PATCH_NAME_MAX 64

static int istitlechar(char c)
{
	return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') ||
		(c >= '0' && c <= '9') || c == '.' || c == '_';
}

static const char *fmt_patch_suffix = ".patch";
static int numbered = 0;
static int auto_number = 1;

static char **extra_hdr;
static int extra_hdr_nr;
static int extra_hdr_alloc;

static char **extra_to;
static int extra_to_nr;
static int extra_to_alloc;

static char **extra_cc;
static int extra_cc_nr;
static int extra_cc_alloc;

static void add_header(const char *value)
{
	int len = strlen(value);
	while (len && value[len - 1] == '\n')
		len--;
	if (!strncasecmp(value, "to: ", 4)) {
		ALLOC_GROW(extra_to, extra_to_nr + 1, extra_to_alloc);
		extra_to[extra_to_nr++] = xstrndup(value + 4, len - 4);
		return;
	}
	if (!strncasecmp(value, "cc: ", 4)) {
		ALLOC_GROW(extra_cc, extra_cc_nr + 1, extra_cc_alloc);
		extra_cc[extra_cc_nr++] = xstrndup(value + 4, len - 4);
		return;
	}
	ALLOC_GROW(extra_hdr, extra_hdr_nr + 1, extra_hdr_alloc);
	extra_hdr[extra_hdr_nr++] = xstrndup(value, len);
}

static int git_format_config(const char *var, const char *value, void *cb)
{
	if (!strcmp(var, "format.headers")) {
		if (!value)
			die("format.headers without value");
		add_header(value);
		return 0;
	}
	if (!strcmp(var, "format.suffix"))
		return git_config_string(&fmt_patch_suffix, var, value);
	if (!strcmp(var, "format.cc")) {
		if (!value)
			return config_error_nonbool(var);
		ALLOC_GROW(extra_cc, extra_cc_nr + 1, extra_cc_alloc);
		extra_cc[extra_cc_nr++] = xstrdup(value);
		return 0;
	}
	if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
		return 0;
	}
	if (!strcmp(var, "format.numbered")) {
		if (value && !strcasecmp(value, "auto")) {
			auto_number = 1;
			return 0;
		}
		numbered = git_config_bool(var, value);
		auto_number = auto_number && numbered;
		return 0;
	}

	return git_log_config(var, value, cb);
}


static const char *get_oneline_for_filename(struct commit *commit,
					    int keep_subject)
{
	static char filename[PATH_MAX];
	char *sol;
	int len = 0;
	int suffix_len = strlen(fmt_patch_suffix) + 1;

	sol = strstr(commit->buffer, "\n\n");
	if (!sol)
		filename[0] = '\0';
	else {
		int j, space = 0;

		sol += 2;
		/* strip [PATCH] or [PATCH blabla] */
		if (!keep_subject && !prefixcmp(sol, "[PATCH")) {
			char *eos = strchr(sol + 6, ']');
			if (eos) {
				while (isspace(*eos))
					eos++;
				sol = eos;
			}
		}

		for (j = 0;
		     j < FORMAT_PATCH_NAME_MAX - suffix_len - 5 &&
			     len < sizeof(filename) - suffix_len &&
			     sol[j] && sol[j] != '\n';
		     j++) {
			if (istitlechar(sol[j])) {
				if (space) {
					filename[len++] = '-';
					space = 0;
				}
				filename[len++] = sol[j];
				if (sol[j] == '.')
					while (sol[j + 1] == '.')
						j++;
			} else
				space = 1;
		}
		while (filename[len - 1] == '.'
		       || filename[len - 1] == '-')
			len--;
		filename[len] = '\0';
	}
	return filename;
}

static FILE *realstdout = NULL;
static const char *output_directory = NULL;

static int reopen_stdout(const char *oneline, int nr, int total)
{
	char filename[PATH_MAX];
	int len = 0;
	int suffix_len = strlen(fmt_patch_suffix) + 1;

	if (output_directory) {
		len = snprintf(filename, sizeof(filename), "%s",
				output_directory);
		if (len >=
		    sizeof(filename) - FORMAT_PATCH_NAME_MAX - suffix_len)
			return error("name of output directory is too long");
		if (filename[len - 1] != '/')
			filename[len++] = '/';
	}

	if (!oneline)
		len += sprintf(filename + len, "%d", nr);
	else {
		len += sprintf(filename + len, "%04d-", nr);
		len += snprintf(filename + len, sizeof(filename) - len - 1
				- suffix_len, "%s", oneline);
		strcpy(filename + len, fmt_patch_suffix);
	}

	fprintf(realstdout, "%s\n", filename);
	if (freopen(filename, "w", stdout) == NULL)
		return error("Cannot open patch file %s",filename);

	return 0;
}

static void get_patch_ids(struct rev_info *rev, struct patch_ids *ids, const char *prefix)
{
	struct rev_info check_rev;
	struct commit *commit;
	struct object *o1, *o2;
	unsigned flags1, flags2;

	if (rev->pending.nr != 2)
		die("Need exactly one range.");

	o1 = rev->pending.objects[0].item;
	flags1 = o1->flags;
	o2 = rev->pending.objects[1].item;
	flags2 = o2->flags;

	if ((flags1 & UNINTERESTING) == (flags2 & UNINTERESTING))
		die("Not a range.");

	init_patch_ids(ids);

	/* given a range a..b get all patch ids for b..a */
	init_revisions(&check_rev, prefix);
	o1->flags ^= UNINTERESTING;
	o2->flags ^= UNINTERESTING;
	add_pending_object(&check_rev, o1, "o1");
	add_pending_object(&check_rev, o2, "o2");
	if (prepare_revision_walk(&check_rev))
		die("revision walk setup failed");

	while ((commit = get_revision(&check_rev)) != NULL) {
		/* ignore merges */
		if (commit->parents && commit->parents->next)
			continue;

		add_commit_patch_id(commit, ids);
	}

	/* reset for next revision walk */
	clear_commit_marks((struct commit *)o1,
			SEEN | UNINTERESTING | SHOWN | ADDED);
	clear_commit_marks((struct commit *)o2,
			SEEN | UNINTERESTING | SHOWN | ADDED);
	o1->flags = flags1;
	o2->flags = flags2;
}

static void gen_message_id(struct rev_info *info, char *base)
{
	const char *committer = git_committer_info(IDENT_WARN_ON_NO_NAME);
	const char *email_start = strrchr(committer, '<');
	const char *email_end = strrchr(committer, '>');
	struct strbuf buf = STRBUF_INIT;
	if (!email_start || !email_end || email_start > email_end - 1)
		die("Could not extract email from committer identity.");
	strbuf_addf(&buf, "%s.%lu.git.%.*s", base,
		    (unsigned long) time(NULL),
		    (int)(email_end - email_start - 1), email_start + 1);
	info->message_id = strbuf_detach(&buf, NULL);
}

static void make_cover_letter(struct rev_info *rev, int use_stdout,
			      int numbered, int numbered_files,
			      struct commit *origin,
			      int nr, struct commit **list, struct commit *head)
{
	const char *committer;
	char *head_sha1;
	const char *subject_start = NULL;
	const char *body = "*** SUBJECT HERE ***\n\n*** BLURB HERE ***\n";
	const char *msg;
	const char *extra_headers = rev->extra_headers;
	struct shortlog log;
	struct strbuf sb = STRBUF_INIT;
	int i;
	const char *encoding = "utf-8";
	struct diff_options opts;
	int need_8bit_cte = 0;

	if (rev->commit_format != CMIT_FMT_EMAIL)
		die("Cover letter needs email format");

	if (!use_stdout && reopen_stdout(numbered_files ?
				NULL : "cover-letter", 0, rev->total))
		return;

	head_sha1 = sha1_to_hex(head->object.sha1);

	log_write_email_headers(rev, head_sha1, &subject_start, &extra_headers,
				&need_8bit_cte);

	committer = git_committer_info(0);

	msg = body;
	pp_user_info(NULL, CMIT_FMT_EMAIL, &sb, committer, DATE_RFC2822,
		     encoding);
	pp_title_line(CMIT_FMT_EMAIL, &msg, &sb, subject_start, extra_headers,
		      encoding, need_8bit_cte);
	pp_remainder(CMIT_FMT_EMAIL, &msg, &sb, 0);
	printf("%s\n", sb.buf);

	strbuf_release(&sb);

	shortlog_init(&log);
	log.wrap_lines = 1;
	log.wrap = 72;
	log.in1 = 2;
	log.in2 = 4;
	for (i = 0; i < nr; i++)
		shortlog_add_commit(&log, list[i]);

	shortlog_output(&log);

	/*
	 * We can only do diffstat with a unique reference point
	 */
	if (!origin)
		return;

	memcpy(&opts, &rev->diffopt, sizeof(opts));
	opts.output_format = DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT;

	diff_setup_done(&opts);

	diff_tree_sha1(origin->tree->object.sha1,
		       head->tree->object.sha1,
		       "", &opts);
	diffcore_std(&opts);
	diff_flush(&opts);

	printf("\n");
}

static const char *clean_message_id(const char *msg_id)
{
	char ch;
	const char *a, *z, *m;

	m = msg_id;
	while ((ch = *m) && (isspace(ch) || (ch == '<')))
		m++;
	a = m;
	z = NULL;
	while ((ch = *m)) {
		if (!isspace(ch) && (ch != '>'))
			z = m;
		m++;
	}
	if (!z)
		die("insane in-reply-to: %s", msg_id);
	if (++z == m)
		return a;
	return xmemdupz(a, z - a);
}

int cmd_format_patch(int argc, const char **argv, const char *prefix)
{
	struct commit *commit;
	struct commit **list = NULL;
	struct rev_info rev;
	int nr = 0, total, i, j;
	int use_stdout = 0;
	int start_number = -1;
	int keep_subject = 0;
	int numbered_files = 0;		/* _just_ numbers */
	int subject_prefix = 0;
	int ignore_if_in_upstream = 0;
	int thread = 0;
	int cover_letter = 0;
	int boundary_count = 0;
	int no_binary_diff = 0;
	struct commit *origin = NULL, *head = NULL;
	const char *in_reply_to = NULL;
	struct patch_ids ids;
	char *add_signoff = NULL;
	struct strbuf buf = STRBUF_INIT;

	git_config(git_format_config, NULL);
	init_revisions(&rev, prefix);
	rev.commit_format = CMIT_FMT_EMAIL;
	rev.verbose_header = 1;
	rev.diff = 1;
	rev.combine_merges = 0;
	rev.ignore_merges = 1;
	DIFF_OPT_SET(&rev.diffopt, RECURSIVE);

	rev.subject_prefix = fmt_patch_subject_prefix;

	/*
	 * Parse the arguments before setup_revisions(), or something
	 * like "git format-patch -o a123 HEAD^.." may fail; a123 is
	 * possibly a valid SHA1.
	 */
	for (i = 1, j = 1; i < argc; i++) {
		if (!strcmp(argv[i], "--stdout"))
			use_stdout = 1;
		else if (!strcmp(argv[i], "-n") ||
				!strcmp(argv[i], "--numbered"))
			numbered = 1;
		else if (!strcmp(argv[i], "-N") ||
				!strcmp(argv[i], "--no-numbered")) {
			numbered = 0;
			auto_number = 0;
		}
		else if (!prefixcmp(argv[i], "--start-number="))
			start_number = strtol(argv[i] + 15, NULL, 10);
		else if (!strcmp(argv[i], "--numbered-files"))
			numbered_files = 1;
		else if (!strcmp(argv[i], "--start-number")) {
			i++;
			if (i == argc)
				die("Need a number for --start-number");
			start_number = strtol(argv[i], NULL, 10);
		}
		else if (!prefixcmp(argv[i], "--cc=")) {
			ALLOC_GROW(extra_cc, extra_cc_nr + 1, extra_cc_alloc);
			extra_cc[extra_cc_nr++] = xstrdup(argv[i] + 5);
		}
		else if (!strcmp(argv[i], "-k") ||
				!strcmp(argv[i], "--keep-subject")) {
			keep_subject = 1;
			rev.total = -1;
		}
		else if (!strcmp(argv[i], "--output-directory") ||
			 !strcmp(argv[i], "-o")) {
			i++;
			if (argc <= i)
				die("Which directory?");
			if (output_directory)
				die("Two output directories?");
			output_directory = argv[i];
		}
		else if (!strcmp(argv[i], "--signoff") ||
			 !strcmp(argv[i], "-s")) {
			const char *committer;
			const char *endpos;
			committer = git_committer_info(IDENT_ERROR_ON_NO_NAME);
			endpos = strchr(committer, '>');
			if (!endpos)
				die("bogus committer info %s\n", committer);
			add_signoff = xmemdupz(committer, endpos - committer + 1);
		}
		else if (!strcmp(argv[i], "--attach")) {
			rev.mime_boundary = git_version_string;
			rev.no_inline = 1;
		}
		else if (!prefixcmp(argv[i], "--attach=")) {
			rev.mime_boundary = argv[i] + 9;
			rev.no_inline = 1;
		}
		else if (!strcmp(argv[i], "--inline")) {
			rev.mime_boundary = git_version_string;
			rev.no_inline = 0;
		}
		else if (!prefixcmp(argv[i], "--inline=")) {
			rev.mime_boundary = argv[i] + 9;
			rev.no_inline = 0;
		}
		else if (!strcmp(argv[i], "--ignore-if-in-upstream"))
			ignore_if_in_upstream = 1;
		else if (!strcmp(argv[i], "--thread"))
			thread = 1;
		else if (!prefixcmp(argv[i], "--in-reply-to="))
			in_reply_to = argv[i] + 14;
		else if (!strcmp(argv[i], "--in-reply-to")) {
			i++;
			if (i == argc)
				die("Need a Message-Id for --in-reply-to");
			in_reply_to = argv[i];
		} else if (!prefixcmp(argv[i], "--subject-prefix=")) {
			subject_prefix = 1;
			rev.subject_prefix = argv[i] + 17;
		} else if (!prefixcmp(argv[i], "--suffix="))
			fmt_patch_suffix = argv[i] + 9;
		else if (!strcmp(argv[i], "--cover-letter"))
			cover_letter = 1;
		else if (!strcmp(argv[i], "--no-binary"))
			no_binary_diff = 1;
		else
			argv[j++] = argv[i];
	}
	argc = j;

	for (i = 0; i < extra_hdr_nr; i++) {
		strbuf_addstr(&buf, extra_hdr[i]);
		strbuf_addch(&buf, '\n');
	}

	if (extra_to_nr)
		strbuf_addstr(&buf, "To: ");
	for (i = 0; i < extra_to_nr; i++) {
		if (i)
			strbuf_addstr(&buf, "    ");
		strbuf_addstr(&buf, extra_to[i]);
		if (i + 1 < extra_to_nr)
			strbuf_addch(&buf, ',');
		strbuf_addch(&buf, '\n');
	}

	if (extra_cc_nr)
		strbuf_addstr(&buf, "Cc: ");
	for (i = 0; i < extra_cc_nr; i++) {
		if (i)
			strbuf_addstr(&buf, "    ");
		strbuf_addstr(&buf, extra_cc[i]);
		if (i + 1 < extra_cc_nr)
			strbuf_addch(&buf, ',');
		strbuf_addch(&buf, '\n');
	}

	rev.extra_headers = strbuf_detach(&buf, 0);

	if (start_number < 0)
		start_number = 1;
	if (numbered && keep_subject)
		die ("-n and -k are mutually exclusive.");
	if (keep_subject && subject_prefix)
		die ("--subject-prefix and -k are mutually exclusive.");
	if (numbered_files && use_stdout)
		die ("--numbered-files and --stdout are mutually exclusive.");

	argc = setup_revisions(argc, argv, &rev, "HEAD");
	if (argc > 1)
		die ("unrecognized argument: %s", argv[1]);

	if (!rev.diffopt.output_format
		|| rev.diffopt.output_format == DIFF_FORMAT_PATCH)
		rev.diffopt.output_format = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_SUMMARY | DIFF_FORMAT_PATCH;

	if (!DIFF_OPT_TST(&rev.diffopt, TEXT) && !no_binary_diff)
		DIFF_OPT_SET(&rev.diffopt, BINARY);

	if (!output_directory && !use_stdout)
		output_directory = prefix;

	if (output_directory) {
		if (use_stdout)
			die("standard output, or directory, which one?");
		if (mkdir(output_directory, 0777) < 0 && errno != EEXIST)
			die("Could not create directory %s",
			    output_directory);
	}

	if (rev.pending.nr == 1) {
		if (rev.max_count < 0 && !rev.show_root_diff) {
			/*
			 * This is traditional behaviour of "git format-patch
			 * origin" that prepares what the origin side still
			 * does not have.
			 */
			rev.pending.objects[0].item->flags |= UNINTERESTING;
			add_head_to_pending(&rev);
		}
		/*
		 * Otherwise, it is "format-patch -22 HEAD", and/or
		 * "format-patch --root HEAD".  The user wants
		 * get_revision() to do the usual traversal.
		 */
	}
	if (cover_letter) {
		/* remember the range */
		int i;
		for (i = 0; i < rev.pending.nr; i++) {
			struct object *o = rev.pending.objects[i].item;
			if (!(o->flags & UNINTERESTING))
				head = (struct commit *)o;
		}
		/* We can't generate a cover letter without any patches */
		if (!head)
			return 0;
	}

	if (ignore_if_in_upstream)
		get_patch_ids(&rev, &ids, prefix);

	if (!use_stdout)
		realstdout = xfdopen(xdup(1), "w");

	if (prepare_revision_walk(&rev))
		die("revision walk setup failed");
	rev.boundary = 1;
	while ((commit = get_revision(&rev)) != NULL) {
		if (commit->object.flags & BOUNDARY) {
			boundary_count++;
			origin = (boundary_count == 1) ? commit : NULL;
			continue;
		}

		/* ignore merges */
		if (commit->parents && commit->parents->next)
			continue;

		if (ignore_if_in_upstream &&
				has_commit_patch_id(commit, &ids))
			continue;

		nr++;
		list = xrealloc(list, nr * sizeof(list[0]));
		list[nr - 1] = commit;
	}
	total = nr;
	if (!keep_subject && auto_number && total > 1)
		numbered = 1;
	if (numbered)
		rev.total = total + start_number - 1;
	if (in_reply_to)
		rev.ref_message_id = clean_message_id(in_reply_to);
	if (cover_letter) {
		if (thread)
			gen_message_id(&rev, "cover");
		make_cover_letter(&rev, use_stdout, numbered, numbered_files,
				  origin, nr, list, head);
		total++;
		start_number--;
	}
	rev.add_signoff = add_signoff;
	while (0 <= --nr) {
		int shown;
		commit = list[nr];
		rev.nr = total - nr + (start_number - 1);
		/* Make the second and subsequent mails replies to the first */
		if (thread) {
			/* Have we already had a message ID? */
			if (rev.message_id) {
				/*
				 * If we've got the ID to be a reply
				 * to, discard the current ID;
				 * otherwise, make everything a reply
				 * to that.
				 */
				if (rev.ref_message_id)
					free(rev.message_id);
				else
					rev.ref_message_id = rev.message_id;
			}
			gen_message_id(&rev, sha1_to_hex(commit->object.sha1));
		}
		if (!use_stdout && reopen_stdout(numbered_files ? NULL :
				get_oneline_for_filename(commit, keep_subject),
				rev.nr, rev.total))
			die("Failed to create output files");
		shown = log_tree_commit(&rev, commit);
		free(commit->buffer);
		commit->buffer = NULL;

		/* We put one extra blank line between formatted
		 * patches and this flag is used by log-tree code
		 * to see if it needs to emit a LF before showing
		 * the log; when using one file per patch, we do
		 * not want the extra blank line.
		 */
		if (!use_stdout)
			rev.shown_one = 0;
		if (shown) {
			if (rev.mime_boundary)
				printf("\n--%s%s--\n\n\n",
				       mime_boundary_leader,
				       rev.mime_boundary);
			else
				printf("-- \n%s\n\n", git_version_string);
		}
		if (!use_stdout)
			fclose(stdout);
	}
	free(list);
	if (ignore_if_in_upstream)
		free_patch_ids(&ids);
	return 0;
}

static int add_pending_commit(const char *arg, struct rev_info *revs, int flags)
{
	unsigned char sha1[20];
	if (get_sha1(arg, sha1) == 0) {
		struct commit *commit = lookup_commit_reference(sha1);
		if (commit) {
			commit->object.flags |= flags;
			add_pending_object(revs, &commit->object, arg);
			return 0;
		}
	}
	return -1;
}

static const char cherry_usage[] =
"git cherry [-v] <upstream> [<head>] [<limit>]";
int cmd_cherry(int argc, const char **argv, const char *prefix)
{
	struct rev_info revs;
	struct patch_ids ids;
	struct commit *commit;
	struct commit_list *list = NULL;
	const char *upstream;
	const char *head = "HEAD";
	const char *limit = NULL;
	int verbose = 0;

	if (argc > 1 && !strcmp(argv[1], "-v")) {
		verbose = 1;
		argc--;
		argv++;
	}

	switch (argc) {
	case 4:
		limit = argv[3];
		/* FALLTHROUGH */
	case 3:
		head = argv[2];
		/* FALLTHROUGH */
	case 2:
		upstream = argv[1];
		break;
	default:
		usage(cherry_usage);
	}

	init_revisions(&revs, prefix);
	revs.diff = 1;
	revs.combine_merges = 0;
	revs.ignore_merges = 1;
	DIFF_OPT_SET(&revs.diffopt, RECURSIVE);

	if (add_pending_commit(head, &revs, 0))
		die("Unknown commit %s", head);
	if (add_pending_commit(upstream, &revs, UNINTERESTING))
		die("Unknown commit %s", upstream);

	/* Don't say anything if head and upstream are the same. */
	if (revs.pending.nr == 2) {
		struct object_array_entry *o = revs.pending.objects;
		if (hashcmp(o[0].item->sha1, o[1].item->sha1) == 0)
			return 0;
	}

	get_patch_ids(&revs, &ids, prefix);

	if (limit && add_pending_commit(limit, &revs, UNINTERESTING))
		die("Unknown commit %s", limit);

	/* reverse the list of commits */
	if (prepare_revision_walk(&revs))
		die("revision walk setup failed");
	while ((commit = get_revision(&revs)) != NULL) {
		/* ignore merges */
		if (commit->parents && commit->parents->next)
			continue;

		commit_list_insert(commit, &list);
	}

	while (list) {
		char sign = '+';

		commit = list->item;
		if (has_commit_patch_id(commit, &ids))
			sign = '-';

		if (verbose) {
			struct strbuf buf = STRBUF_INIT;
			pretty_print_commit(CMIT_FMT_ONELINE, commit,
			                    &buf, 0, NULL, NULL, 0, 0);
			printf("%c %s %s\n", sign,
			       sha1_to_hex(commit->object.sha1), buf.buf);
			strbuf_release(&buf);
		}
		else {
			printf("%c %s\n", sign,
			       sha1_to_hex(commit->object.sha1));
		}

		list = list->next;
	}

	free_patch_ids(&ids);
	return 0;
}