summary refs log tree commit diff
path: root/ui.c
blob: 212d205e66809233ed379edaa039a601e6bdd934 (plain) (blame)
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
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
/* Copyright (C) 2020  C. McEnroe <june@causal.agency>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 *
 * Additional permission under GNU GPL version 3 section 7:
 *
 * If you modify this Program, or any covered work, by linking or
 * combining it with OpenSSL (or a modified version of that library),
 * containing parts covered by the terms of the OpenSSL License and the
 * original SSLeay license, the licensors of this Program grant you
 * additional permission to convey the resulting work. Corresponding
 * Source for a non-source form of such a combination shall include the
 * source code for the parts of OpenSSL used as well as that of the
 * covered work.
 */

#define _XOPEN_SOURCE_EXTENDED

#include <assert.h>
#include <ctype.h>
#include <curses.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <sys/file.h>
#include <term.h>
#include <termios.h>
#include <time.h>
#include <unistd.h>
#include <wchar.h>
#include <wctype.h>

#ifdef __FreeBSD__
#include <capsicum_helpers.h>
#endif

#include "chat.h"
#include "edit.h"

// Annoying stuff from <term.h>:
#undef lines
#undef tab

enum {
	StatusLines = 1,
	MarkerLines = 1,
	SplitLines = 5,
	InputLines = 1,
	InputCols = 1024,
};

#define BOTTOM (LINES - 1)
#define RIGHT (COLS - 1)
#define MAIN_LINES (LINES - StatusLines - InputLines)

static WINDOW *status;
static WINDOW *main;
static WINDOW *input;

struct Window {
	uint id;
	int scroll;
	bool mark;
	bool mute;
	bool time;
	enum Heat thresh;
	enum Heat heat;
	uint unreadSoft;
	uint unreadHard;
	uint unreadWarm;
	struct Buffer *buffer;
};

static struct {
	struct Window *ptrs[IDCap];
	uint len;
	uint show;
	uint swap;
	uint user;
} windows;

static uint windowPush(struct Window *window) {
	assert(windows.len < IDCap);
	windows.ptrs[windows.len] = window;
	return windows.len++;
}

static uint windowInsert(uint num, struct Window *window) {
	assert(windows.len < IDCap);
	assert(num <= windows.len);
	memmove(
		&windows.ptrs[num + 1],
		&windows.ptrs[num],
		sizeof(*windows.ptrs) * (windows.len - num)
	);
	windows.ptrs[num] = window;
	windows.len++;
	return num;
}

static struct Window *windowRemove(uint num) {
	assert(num < windows.len);
	struct Window *window = windows.ptrs[num];
	windows.len--;
	memmove(
		&windows.ptrs[num],
		&windows.ptrs[num + 1],
		sizeof(*windows.ptrs) * (windows.len - num)
	);
	return window;
}

enum Heat uiThreshold = Cold;

static uint windowFor(uint id) {
	for (uint num = 0; num < windows.len; ++num) {
		if (windows.ptrs[num]->id == id) return num;
	}
	struct Window *window = calloc(1, sizeof(*window));
	if (!window) err(EX_OSERR, "malloc");
	window->id = id;
	window->mark = true;
	window->time = uiTime.enable;
	if (id == Network || id == Debug) {
		window->thresh = Cold;
	} else {
		window->thresh = uiThreshold;
	}
	window->buffer = bufferAlloc();
	completeAdd(None, idNames[id], idColors[id]);
	return windowPush(window);
}

static void windowFree(struct Window *window) {
	completeRemove(None, idNames[window->id]);
	bufferFree(window->buffer);
	free(window);
}

static short colorPairs;

static void colorInit(void) {
	start_color();
	use_default_colors();
	if (!COLORS) return;
	for (short pair = 0; pair < 16; ++pair) {
		init_pair(1 + pair, pair % COLORS, -1);
	}
	colorPairs = 17;
}

static attr_t colorAttr(short fg) {
	if (!COLORS) return (fg > 0 ? A_BOLD : A_NORMAL);
	if (fg != COLOR_BLACK && fg % COLORS == COLOR_BLACK) return A_BOLD;
	if (COLORS > 8) return A_NORMAL;
	return (fg / COLORS & 1 ? A_BOLD : A_NORMAL);
}

static short colorPair(short fg, short bg) {
	if (!COLORS) return 0;
	fg %= COLORS;
	bg %= COLORS;
	if (bg == -1 && fg < 16) return 1 + fg;
	for (short pair = 17; pair < colorPairs; ++pair) {
		short f, b;
		pair_content(pair, &f, &b);
		if (f == fg && b == bg) return pair;
	}
	init_pair(colorPairs, fg, bg);
	return colorPairs++;
}

#define ENUM_KEY \
	X(KeyCtrlLeft, "\33[1;5D", NULL) \
	X(KeyCtrlRight, "\33[1;5C", NULL) \
	X(KeyMeta0, "\0330", "\33)") \
	X(KeyMeta1, "\0331", "\33!") \
	X(KeyMeta2, "\0332", "\33@") \
	X(KeyMeta3, "\0333", "\33#") \
	X(KeyMeta4, "\0334", "\33$") \
	X(KeyMeta5, "\0335", "\33%") \
	X(KeyMeta6, "\0336", "\33^") \
	X(KeyMeta7, "\0337", "\33&") \
	X(KeyMeta8, "\0338", "\33*") \
	X(KeyMeta9, "\0339", "\33(") \
	X(KeyMetaA, "\33a", NULL) \
	X(KeyMetaB, "\33b", NULL) \
	X(KeyMetaD, "\33d", NULL) \
	X(KeyMetaF, "\33f", NULL) \
	X(KeyMetaL, "\33l", NULL) \
	X(KeyMetaM, "\33m", NULL) \
	X(KeyMetaN, "\33n", NULL) \
	X(KeyMetaP, "\33p", NULL) \
	X(KeyMetaQ, "\33q", NULL) \
	X(KeyMetaS, "\33s", NULL) \
	X(KeyMetaT, "\33t", NULL) \
	X(KeyMetaU, "\33u", NULL) \
	X(KeyMetaV, "\33v", NULL) \
	X(KeyMetaEnter, "\33\r", "\33\n") \
	X(KeyMetaGt, "\33>", "\33.") \
	X(KeyMetaLt, "\33<", "\33,") \
	X(KeyMetaEqual, "\33=", NULL) \
	X(KeyMetaMinus, "\33-", "\33_") \
	X(KeyMetaPlus, "\33+", NULL) \
	X(KeyMetaSlash, "\33/", "\33?") \
	X(KeyFocusIn, "\33[I", NULL) \
	X(KeyFocusOut, "\33[O", NULL) \
	X(KeyPasteOn, "\33[200~", NULL) \
	X(KeyPasteOff, "\33[201~", NULL) \
	X(KeyPasteManual, "\32p", "\32\20")

enum {
	KeyMax = KEY_MAX,
#define X(id, seq, alt) id,
	ENUM_KEY
#undef X
};

// XXX: Assuming terminals will be fine with these even if they're unsupported,
// since they're "private" modes.
static const char *FocusMode[2] = { "\33[?1004l", "\33[?1004h" };
static const char *PasteMode[2] = { "\33[?2004l", "\33[?2004h" };

struct Time uiTime = { .format = "%X" };

static void errExit(void) {
	putp(FocusMode[false]);
	putp(PasteMode[false]);
	reset_shell_mode();
}

void uiInitEarly(void) {
	initscr();
	cbreak();
	noecho();
	colorInit();
	atexit(errExit);

#ifndef A_ITALIC
#define A_ITALIC A_BLINK
	// Force ncurses to use individual enter_attr_mode strings:
	set_attributes = NULL;
	enter_blink_mode = enter_italics_mode;
#endif

	if (!to_status_line && !strncmp(termname(), "xterm", 5)) {
		to_status_line = "\33]2;";
		from_status_line = "\7";
	}

#define X(id, seq, alt) define_key(seq, id); if (alt) define_key(alt, id);
	ENUM_KEY
#undef X

	status = newwin(StatusLines, COLS, 0, 0);
	if (!status) err(EX_OSERR, "newwin");

	main = newwin(MAIN_LINES, COLS, StatusLines, 0);
	if (!main) err(EX_OSERR, "newwin");

	int y;
	char fmt[TimeCap];
	char buf[TimeCap];
	styleStrip(fmt, sizeof(fmt), uiTime.format);
	struct tm *time = localtime(&(time_t) { -22100400 });
	size_t len = strftime(buf, sizeof(buf), fmt, time);
	if (!len) errx(EX_CONFIG, "invalid timestamp format: %s", fmt);
	waddstr(main, buf);
	waddch(main, ' ');
	getyx(main, y, uiTime.width);
	(void)y;

	input = newpad(InputLines, InputCols);
	if (!input) err(EX_OSERR, "newpad");
	keypad(input, true);
	nodelay(input, true);

	windowFor(Network);
	uiShow();
}

// Avoid disabling VINTR until main loop.
void uiInitLate(void) {
	struct termios term;
	int error = tcgetattr(STDOUT_FILENO, &term);
	if (error) err(EX_OSERR, "tcgetattr");

	// Gain use of C-q, C-s, C-c, C-z, C-y, C-v, C-o.
	term.c_iflag &= ~IXON;
	term.c_cc[VINTR] = _POSIX_VDISABLE;
	term.c_cc[VSUSP] = _POSIX_VDISABLE;
#ifdef VDSUSP
	term.c_cc[VDSUSP] = _POSIX_VDISABLE;
#endif
	term.c_cc[VLNEXT] = _POSIX_VDISABLE;
	term.c_cc[VDISCARD] = _POSIX_VDISABLE;

	error = tcsetattr(STDOUT_FILENO, TCSANOW, &term);
	if (error) err(EX_OSERR, "tcsetattr");

	def_prog_mode();
}

static bool hidden = true;
static bool waiting;

static char title[256];
static char prevTitle[sizeof(title)];

void uiDraw(void) {
	if (hidden) return;
	wnoutrefresh(status);
	wnoutrefresh(main);
	int y, x;
	getyx(input, y, x);
	pnoutrefresh(
		input,
		0, (x + 1 > RIGHT ? x + 1 - RIGHT : 0),
		LINES - InputLines, 0,
		BOTTOM, RIGHT
	);
	(void)y;
	doupdate();

	if (!to_status_line) return;
	if (!strcmp(title, prevTitle)) return;
	strcpy(prevTitle, title);
	putp(to_status_line);
	putp(title);
	putp(from_status_line);
	fflush(stdout);
}

static const short Colors[ColorCap] = {
	[Default]    = -1,
	[White]      = 8 + COLOR_WHITE,
	[Black]      = 0 + COLOR_BLACK,
	[Blue]       = 0 + COLOR_BLUE,
	[Green]      = 0 + COLOR_GREEN,
	[Red]        = 8 + COLOR_RED,
	[Brown]      = 0 + COLOR_RED,
	[Magenta]    = 0 + COLOR_MAGENTA,
	[Orange]     = 0 + COLOR_YELLOW,
	[Yellow]     = 8 + COLOR_YELLOW,
	[LightGreen] = 8 + COLOR_GREEN,
	[Cyan]       = 0 + COLOR_CYAN,
	[LightCyan]  = 8 + COLOR_CYAN,
	[LightBlue]  = 8 + COLOR_BLUE,
	[Pink]       = 8 + COLOR_MAGENTA,
	[Gray]       = 8 + COLOR_BLACK,
	[LightGray]  = 0 + COLOR_WHITE,
	52, 94, 100, 58, 22, 29, 23, 24, 17, 54, 53, 89,
	88, 130, 142, 64, 28, 35, 30, 25, 18, 91, 90, 125,
	124, 166, 184, 106, 34, 49, 37, 33, 19, 129, 127, 161,
	196, 208, 226, 154, 46, 86, 51, 75, 21, 171, 201, 198,
	203, 215, 227, 191, 83, 122, 87, 111, 63, 177, 207, 205,
	217, 223, 229, 193, 157, 158, 159, 153, 147, 183, 219, 212,
	16, 233, 235, 237, 239, 241, 244, 247, 250, 254, 231,
};

static attr_t styleAttr(struct Style style) {
	attr_t attr = A_NORMAL;
	if (style.attr & Bold) attr |= A_BOLD;
	if (style.attr & Reverse) attr |= A_REVERSE;
	if (style.attr & Italic) attr |= A_ITALIC;
	if (style.attr & Underline) attr |= A_UNDERLINE;
	return attr | colorAttr(Colors[style.fg]);
}

static bool spoilerReveal;

static short stylePair(struct Style style) {
	if (spoilerReveal && style.fg == style.bg) {
		return colorPair(Colors[Default], Colors[style.bg]);
	}
	return colorPair(Colors[style.fg], Colors[style.bg]);
}

static int styleAdd(WINDOW *win, struct Style init, const char *str) {
	struct Style style = init;
	while (*str) {
		size_t len = styleParse(&style, &str);
		wattr_set(win, styleAttr(style), stylePair(style), NULL);
		if (waddnstr(win, str, len) == ERR)
			return -1;
		str += len;
	}
	return 0;
}

static void statusUpdate(void) {
	struct {
		uint unread;
		enum Heat heat;
	} others = { 0, Cold };

	wmove(status, 0, 0);
	for (uint num = 0; num < windows.len; ++num) {
		const struct Window *window = windows.ptrs[num];
		if (num != windows.show && !window->scroll) {
			if (window->heat < Warm) continue;
			if (window->mute && window->heat < Hot) continue;
		}
		if (num != windows.show) {
			others.unread += window->unreadWarm;
			if (window->heat > others.heat) others.heat = window->heat;
		}
		char buf[256], *end = &buf[sizeof(buf)];
		char *ptr = seprintf(
			buf, end, "\3%d%s %u%s%s %s ",
			idColors[window->id], (num == windows.show ? "\26" : ""),
			num, window->thresh[(const char *[]) { "-", "", "+", "++" }],
			&"="[!window->mute], idNames[window->id]
		);
		if (window->mark && window->unreadWarm) {
			ptr = seprintf(
				ptr, end, "\3%d+%d\3%d%s",
				(window->heat > Warm ? White : idColors[window->id]),
				window->unreadWarm, idColors[window->id],
				(window->scroll ? "" : " ")
			);
		}
		if (window->scroll) {
			ptr = seprintf(ptr, end, "~%d ", window->scroll);
		}
		if (styleAdd(status, StyleDefault, buf) < 0) break;
	}
	wclrtoeol(status);

	const struct Window *window = windows.ptrs[windows.show];
	char *end = &title[sizeof(title)];
	char *ptr = seprintf(
		title, end, "%s %s", network.name, idNames[window->id]
	);
	if (window->mark && window->unreadWarm) {
		ptr = seprintf(
			ptr, end, " +%d%s", window->unreadWarm, &"!"[window->heat < Hot]
		);
	}
	if (others.unread) {
		ptr = seprintf(
			ptr, end, " (+%d%s)", others.unread, &"!"[others.heat < Hot]
		);
	}
}

static void mark(struct Window *window) {
	if (window->scroll) return;
	window->mark = true;
	window->unreadSoft = 0;
	window->unreadWarm = 0;
}

static void unmark(struct Window *window) {
	if (!window->scroll) {
		window->mark = false;
		window->heat = Cold;
	}
	statusUpdate();
}

void uiShow(void) {
	if (!hidden) return;
	prevTitle[0] = '\0';
	putp(FocusMode[true]);
	putp(PasteMode[true]);
	fflush(stdout);
	hidden = false;
	unmark(windows.ptrs[windows.show]);
}

void uiHide(void) {
	if (hidden) return;
	mark(windows.ptrs[windows.show]);
	hidden = true;
	putp(FocusMode[false]);
	putp(PasteMode[false]);
	endwin();
}

static size_t windowTop(const struct Window *window) {
	size_t top = BufferCap - MAIN_LINES - window->scroll;
	if (window->scroll) top += MarkerLines;
	return top;
}

static size_t windowBottom(const struct Window *window) {
	size_t bottom = BufferCap - (window->scroll ?: 1);
	if (window->scroll) bottom -= SplitLines + MarkerLines;
	return bottom;
}

static int windowCols(const struct Window *window) {
	return COLS - (window->time ? uiTime.width : 0);
}

static void mainAdd(int y, bool time, const struct Line *line) {
	int ny, nx;
	wmove(main, y, 0);
	if (!line || !line->str[0]) {
		wclrtoeol(main);
		return;
	}
	if (time && line->time) {
		char buf[TimeCap];
		strftime(buf, sizeof(buf), uiTime.format, localtime(&line->time));
		struct Style init = { .fg = Gray, .bg = Default };
		styleAdd(main, init, buf);
		waddch(main, ' ');
	} else if (time) {
		whline(main, ' ', uiTime.width);
		wmove(main, y, uiTime.width);
	}
	styleAdd(main, StyleDefault, line->str);
	getyx(main, ny, nx);
	if (ny != y) return;
	wclrtoeol(main);
	(void)nx;
}

static void mainUpdate(void) {
	struct Window *window = windows.ptrs[windows.show];

	int y = 0;
	int marker = MAIN_LINES - SplitLines - MarkerLines;
	for (size_t i = windowTop(window); i < BufferCap; ++i) {
		mainAdd(y++, window->time, bufferHard(window->buffer, i));
		if (window->scroll && y == marker) break;
	}
	if (!window->scroll) return;

	y = MAIN_LINES - SplitLines;
	for (size_t i = BufferCap - SplitLines; i < BufferCap; ++i) {
		mainAdd(y++, window->time, bufferHard(window->buffer, i));
	}
	wattr_set(main, A_NORMAL, 0, NULL);
	mvwhline(main, marker, 0, ACS_BULLET, COLS);
}

static void windowScroll(struct Window *window, int n) {
	mark(window);
	window->scroll += n;
	if (window->scroll > BufferCap - MAIN_LINES) {
		window->scroll = BufferCap - MAIN_LINES;
	}
	if (window->scroll < 0) window->scroll = 0;
	unmark(window);
	if (window == windows.ptrs[windows.show]) mainUpdate();
}

struct Util uiNotifyUtil;
static void notify(uint id, const char *str) {
	if (self.restricted) return;
	if (!uiNotifyUtil.argc) return;

	char buf[1024];
	styleStrip(buf, sizeof(buf), str);

	struct Util util = uiNotifyUtil;
	utilPush(&util, idNames[id]);
	utilPush(&util, buf);

	pid_t pid = fork();
	if (pid < 0) err(EX_OSERR, "fork");
	if (pid) return;

	setsid();
	close(STDIN_FILENO);
	dup2(utilPipe[1], STDOUT_FILENO);
	dup2(utilPipe[1], STDERR_FILENO);
	execvp(util.argv[0], (char *const *)util.argv);
	warn("%s", util.argv[0]);
	_exit(EX_CONFIG);
}

void uiWrite(uint id, enum Heat heat, const time_t *src, const char *str) {
	struct Window *window = windows.ptrs[windowFor(id)];
	time_t ts = (src ? *src : time(NULL));

	if (heat >= window->thresh) {
		if (!window->unreadSoft++) window->unreadHard = 0;
	}
	if (window->mark && heat > Cold) {
		if (!window->unreadWarm++) {
			int lines = bufferPush(
				window->buffer, windowCols(window),
				window->thresh, Warm, ts, ""
			);
			if (window->scroll) windowScroll(window, lines);
			if (window->unreadSoft > 1) {
				window->unreadSoft++;
				window->unreadHard += lines;
			}
		}
		if (heat > window->heat) window->heat = heat;
		statusUpdate();
	}
	int lines = bufferPush(
		window->buffer, windowCols(window),
		window->thresh, heat, ts, str
	);
	window->unreadHard += lines;
	if (window->scroll) windowScroll(window, lines);
	if (window == windows.ptrs[windows.show]) mainUpdate();

	if (window->mark && heat > Warm) {
		beep();
		notify(id, str);
	}
}

void uiFormat(
	uint id, enum Heat heat, const time_t *time, const char *format, ...
) {
	char buf[1024];
	va_list ap;
	va_start(ap, format);
	int len = vsnprintf(buf, sizeof(buf), format, ap);
	va_end(ap);
	assert((size_t)len < sizeof(buf));
	uiWrite(id, heat, time, buf);
}

static void scrollTo(struct Window *window, int top) {
	window->scroll = 0;
	windowScroll(window, top - MAIN_LINES + MarkerLines);
}

static void windowReflow(struct Window *window) {
	uint num = 0;
	const struct Line *line = bufferHard(window->buffer, windowTop(window));
	if (line) num = line->num;
	window->unreadHard = bufferReflow(
		window->buffer, windowCols(window),
		window->thresh, window->unreadSoft
	);
	if (!window->scroll || !num) return;
	for (size_t i = 0; i < BufferCap; ++i) {
		line = bufferHard(window->buffer, i);
		if (!line || line->num != num) continue;
		scrollTo(window, BufferCap - i);
		break;
	}
}

static void resize(void) {
	wclear(main);
	wresize(main, MAIN_LINES, COLS);
	for (uint num = 0; num < windows.len; ++num) {
		windowReflow(windows.ptrs[num]);
	}
	statusUpdate();
	mainUpdate();
}

static void windowList(const struct Window *window) {
	uiHide();
	waiting = true;

	uint num = 0;
	const struct Line *line = bufferHard(window->buffer, windowBottom(window));
	if (line) num = line->num;
	for (size_t i = 0; i < BufferCap; ++i) {
		line = bufferSoft(window->buffer, i);
		if (!line) continue;
		if (line->num > num) break;
		if (!line->str[0]) {
			printf("\n");
			continue;
		}

		char buf[TimeCap];
		strftime(buf, sizeof(buf), uiTime.format, localtime(&line->time));
		vid_attr(colorAttr(Colors[Gray]), colorPair(Colors[Gray], -1), NULL);
		printf("%s ", buf);

		bool align = false;
		struct Style style = StyleDefault;
		for (const char *str = line->str; *str;) {
			if (*str == '\t') {
				printf("%c", (align ? '\t' : ' '));
				align = true;
				str++;
			}

			size_t len = styleParse(&style, &str);
			size_t tab = strcspn(str, "\t");
			if (tab < len) len = tab;

			vid_attr(styleAttr(style), stylePair(style), NULL);
			printf("%.*s", (int)len, str);
			str += len;
		}
		printf("\n");
	}
}

static void inputAdd(struct Style reset, struct Style *style, const char *str) {
	while (*str) {
		const char *code = str;
		size_t len = styleParse(style, &str);
		wattr_set(input, A_BOLD | A_REVERSE, 0, NULL);
		switch (*code) {
			break; case B: waddch(input, 'B');
			break; case C: waddch(input, 'C');
			break; case O: waddch(input, 'O');
			break; case R: waddch(input, 'R');
			break; case I: waddch(input, 'I');
			break; case U: waddch(input, 'U');
			break; case '\n': waddch(input, 'N');
		}
		if (str - code > 1) waddnstr(input, &code[1], str - &code[1]);
		if (str[0] == '\n') {
			*style = reset;
			str++;
			len--;
		}
		size_t nl = strcspn(str, "\n");
		if (nl < len) len = nl;
		wattr_set(input, styleAttr(*style), stylePair(*style), NULL);
		waddnstr(input, str, len);
		str += len;
	}
}

static char *inputStop(
	struct Style reset, struct Style *style,
	const char *str, char *stop
) {
	char ch = *stop;
	*stop = '\0';
	inputAdd(reset, style, str);
	*stop = ch;
	return stop;
}

static struct Edit edit;

static void inputUpdate(void) {
	char *buf = editString(&edit);
	struct Window *window = windows.ptrs[windows.show];

	const char *prefix = "";
	const char *prompt = self.nick;
	const char *suffix = "";
	const char *skip = buf;
	struct Style stylePrompt = { .fg = self.color, .bg = Default };
	struct Style styleInput = StyleDefault;

	size_t split = commandWillSplit(window->id, buf);
	const char *privmsg = commandIsPrivmsg(window->id, buf);
	const char *notice = commandIsNotice(window->id, buf);
	const char *action = commandIsAction(window->id, buf);
	if (privmsg) {
		prefix = "<"; suffix = "> ";
		skip = privmsg;
	} else if (notice) {
		prefix = "-"; suffix = "- ";
		styleInput.fg = LightGray;
		skip = notice;
	} else if (action) {
		prefix = "* "; suffix = " ";
		stylePrompt.attr |= Italic;
		styleInput.attr |= Italic;
		skip = action;
	} else if (window->id == Debug && buf[0] != '/') {
		prompt = "<< ";
		stylePrompt.fg = Gray;
	} else {
		prompt = "";
	}
	if (skip > &buf[edit.mbs.pos]) {
		prefix = prompt = suffix = "";
		skip = buf;
	}

	int y, x;
	wmove(input, 0, 0);
	if (window->time && window->id != Network) {
		whline(input, ' ', uiTime.width);
		wmove(input, 0, uiTime.width);
	}
	wattr_set(input, styleAttr(stylePrompt), stylePair(stylePrompt), NULL);
	waddstr(input, prefix);
	waddstr(input, prompt);
	waddstr(input, suffix);
	getyx(input, y, x);

	int pos;
	struct Style style = styleInput;
	inputStop(styleInput, &style, skip, &buf[edit.mbs.pos]);
	getyx(input, y, pos);
	wmove(input, y, x);

	style = styleInput;
	const char *ptr = skip;
	if (split) {
		ptr = inputStop(styleInput, &style, ptr, &buf[split]);
		style = styleInput;
		style.bg = Red;
	}
	inputAdd(styleInput, &style, ptr);
	wclrtoeol(input);
	wmove(input, y, pos);
}

void uiWindows(void) {
	for (uint num = 0; num < windows.len; ++num) {
		const struct Window *window = windows.ptrs[num];
		uiFormat(
			Network, Warm, NULL, "\3%02d%u %s",
			idColors[window->id], num, idNames[window->id]
		);
	}
}

static void windowShow(uint num) {
	if (num != windows.show) {
		windows.swap = windows.show;
		mark(windows.ptrs[windows.swap]);
	}
	windows.show = num;
	windows.user = num;
	unmark(windows.ptrs[windows.show]);
	mainUpdate();
	inputUpdate();
}

void uiShowID(uint id) {
	windowShow(windowFor(id));
}

void uiShowNum(uint num) {
	if (num < windows.len) windowShow(num);
}

void uiMoveID(uint id, uint num) {
	struct Window *window = windowRemove(windowFor(id));
	if (num < windows.len) {
		windowShow(windowInsert(num, window));
	} else {
		windowShow(windowPush(window));
	}
}

static void windowClose(uint num) {
	if (windows.ptrs[num]->id == Network) return;
	struct Window *window = windowRemove(num);
	completeClear(window->id);
	windowFree(window);
	if (windows.swap >= num) windows.swap--;
	if (windows.show == num) {
		windowShow(windows.swap);
		windows.swap = windows.show;
	} else if (windows.show > num) {
		windows.show--;
		mainUpdate();
	}
	statusUpdate();
}

void uiCloseID(uint id) {
	windowClose(windowFor(id));
}

void uiCloseNum(uint num) {
	if (num < windows.len) windowClose(num);
}

static void scrollPage(struct Window *window, int n) {
	windowScroll(window, n * (MAIN_LINES - SplitLines - MarkerLines - 1));
}

static void scrollTop(struct Window *window) {
	for (size_t i = 0; i < BufferCap; ++i) {
		if (!bufferHard(window->buffer, i)) continue;
		scrollTo(window, BufferCap - i);
		break;
	}
}

static void scrollHot(struct Window *window, int dir) {
	for (size_t i = windowTop(window) + dir; i < BufferCap; i += dir) {
		const struct Line *line = bufferHard(window->buffer, i);
		const struct Line *prev = bufferHard(window->buffer, i - 1);
		if (!line || line->heat < Hot) continue;
		if (prev && prev->heat > Warm) continue;
		scrollTo(window, BufferCap - i);
		break;
	}
}

static void scrollSearch(struct Window *window, const char *str, int dir) {
	for (size_t i = windowTop(window) + dir; i < BufferCap; i += dir) {
		const struct Line *line = bufferHard(window->buffer, i);
		if (!line || !strcasestr(line->str, str)) continue;
		scrollTo(window, BufferCap - i);
		break;
	}
}

static void toggleTime(struct Window *window) {
	window->time ^= true;
	windowReflow(window);
	statusUpdate();
	mainUpdate();
	inputUpdate();
}

static void incThresh(struct Window *window, int n) {
	if (n > 0 && window->thresh == Hot) return;
	if (n < 0 && window->thresh == Ice) {
		window->thresh = Cold;
	} else {
		window->thresh += n;
	}
	windowReflow(window);
	statusUpdate();
	mainUpdate();
	statusUpdate();
}

static void showAuto(void) {
	uint minHot = UINT_MAX, numHot = 0;
	uint minWarm = UINT_MAX, numWarm = 0;
	for (uint num = 0; num < windows.len; ++num) {
		struct Window *window = windows.ptrs[num];
		if (window->heat >= Hot) {
			if (window->unreadWarm >= minHot) continue;
			minHot = window->unreadWarm;
			numHot = num;
		}
		if (window->heat >= Warm && !window->mute) {
			if (window->unreadWarm >= minWarm) continue;
			minWarm = window->unreadWarm;
			numWarm = num;
		}
	}
	uint user = windows.user;
	if (minHot < UINT_MAX) {
		windowShow(numHot);
		windows.user = user;
	} else if (minWarm < UINT_MAX) {
		windowShow(numWarm);
		windows.user = user;
	} else if (user != windows.show) {
		windowShow(user);
	}
}

static void inputEnter(uint id) {
	command(id, editString(&edit));
	editFn(&edit, EditClear);
}

static void keyCode(int code) {
	struct Window *window = windows.ptrs[windows.show];
	uint id = window->id;
	switch (code) {
		break; case KEY_RESIZE:  resize();
		break; case KeyFocusIn:  unmark(window);
		break; case KeyFocusOut: mark(window);

		break; case KeyMetaEnter: editInsert(&edit, L'\n');
		break; case KeyMetaEqual: window->mute ^= true; statusUpdate();
		break; case KeyMetaMinus: incThresh(window, -1);
		break; case KeyMetaPlus:  incThresh(window, +1);
		break; case KeyMetaSlash: windowShow(windows.swap);

		break; case KeyMetaGt: scrollTo(window, 0);
		break; case KeyMetaLt: scrollTop(window);

		break; case KeyMeta0 ... KeyMeta9: uiShowNum(code - KeyMeta0);
		break; case KeyMetaA: showAuto();
		break; case KeyMetaB: editFn(&edit, EditPrevWord);
		break; case KeyMetaD: editFn(&edit, EditDeleteNextWord);
		break; case KeyMetaF: editFn(&edit, EditNextWord);
		break; case KeyMetaL: windowList(window);
		break; case KeyMetaM: uiWrite(id, Warm, NULL, "");
		break; case KeyMetaN: scrollHot(window, +1);
		break; case KeyMetaP: scrollHot(window, -1);
		break; case KeyMetaQ: editFn(&edit, EditCollapse);
		break; case KeyMetaS: spoilerReveal ^= true; mainUpdate();
		break; case KeyMetaT: toggleTime(window);
		break; case KeyMetaU: scrollTo(window, window->unreadHard);
		break; case KeyMetaV: scrollPage(window, +1);

		break; case KeyCtrlLeft: editFn(&edit, EditPrevWord);
		break; case KeyCtrlRight: editFn(&edit, EditNextWord);

		break; case KEY_BACKSPACE: editFn(&edit, EditDeletePrev);
		break; case KEY_DC: editFn(&edit, EditDeleteNext);
		break; case KEY_DOWN: windowScroll(window, -1);
		break; case KEY_END: editFn(&edit, EditTail);
		break; case KEY_ENTER: inputEnter(id);
		break; case KEY_HOME: editFn(&edit, EditHead);
		break; case KEY_LEFT: editFn(&edit, EditPrev);
		break; case KEY_NPAGE: scrollPage(window, -1);
		break; case KEY_PPAGE: scrollPage(window, +1);
		break; case KEY_RIGHT: editFn(&edit, EditNext);
		break; case KEY_SEND: scrollTo(window, 0);
		break; case KEY_SHOME: scrollTo(window, BufferCap);
		break; case KEY_UP: windowScroll(window, +1);
	}
}

static void keyCtrl(wchar_t ch) {
	struct Window *window = windows.ptrs[windows.show];
	uint id = window->id;
	switch (ch ^ L'@') {
		break; case L'?': editFn(&edit, EditDeletePrev);
		break; case L'A': editFn(&edit, EditHead);
		break; case L'B': editFn(&edit, EditPrev);
		break; case L'C': raise(SIGINT);
		break; case L'D': editFn(&edit, EditDeleteNext);
		break; case L'E': editFn(&edit, EditTail);
		break; case L'F': editFn(&edit, EditNext);
		break; case L'H': editFn(&edit, EditDeletePrev);
		break; case L'J': inputEnter(id);
		break; case L'K': editFn(&edit, EditDeleteTail);
		break; case L'L': clearok(curscr, true);
		break; case L'N': uiShowNum(windows.show + 1);
		break; case L'P': uiShowNum(windows.show - 1);
		break; case L'R': scrollSearch(window, editString(&edit), -1);
		break; case L'S': scrollSearch(window, editString(&edit), +1);
		break; case L'T': editFn(&edit, EditTranspose);
		break; case L'U': editFn(&edit, EditDeleteHead);
		break; case L'V': scrollPage(window, -1);
		break; case L'W': editFn(&edit, EditDeletePrevWord);
		break; case L'Y': editFn(&edit, EditPaste);
	}
}

static void keyStyle(wchar_t ch) {
	if (iswcntrl(ch)) ch = towlower(ch ^ L'@');
	char buf[8] = {0};
	enum Color color = Default;
	switch (ch) {
		break; case L'A': color = Gray;
		break; case L'B': color = Blue;
		break; case L'C': color = Cyan;
		break; case L'G': color = Green;
		break; case L'K': color = Black;
		break; case L'M': color = Magenta;
		break; case L'N': color = Brown;
		break; case L'O': color = Orange;
		break; case L'P': color = Pink;
		break; case L'R': color = Red;
		break; case L'W': color = White;
		break; case L'Y': color = Yellow;
		break; case L'b': buf[0] = B;
		break; case L'c': buf[0] = C;
		break; case L'i': buf[0] = I;
		break; case L'o': buf[0] = O;
		break; case L'r': buf[0] = R;
		break; case L's': {
			snprintf(buf, sizeof(buf), "%c%02d,%02d", C, Black, Black);
		}
		break; case L'u': buf[0] = U;
	}
	if (color != Default) {
		snprintf(buf, sizeof(buf), "%c%02d", C, color);
	}
	for (char *ch = buf; *ch; ++ch) {
		editInsert(&edit, *ch);
	}
}

void uiRead(void) {
	if (hidden) {
		if (waiting) {
			uiShow();
			flushinp();
			waiting = false;
		} else {
			return;
		}
	}

	wint_t ch;
	static bool paste, style, literal;
	for (int ret; ERR != (ret = wget_wch(input, &ch));) {
		bool spr = spoilerReveal;
		if (ret == KEY_CODE_YES && ch == KeyPasteOn) {
			paste = true;
		} else if (ret == KEY_CODE_YES && ch == KeyPasteOff) {
			paste = false;
		} else if (ret == KEY_CODE_YES && ch == KeyPasteManual) {
			paste ^= true;
		} else if (paste || literal) {
			editInsert(&edit, ch);
		} else if (ret == KEY_CODE_YES) {
			keyCode(ch);
		} else if (ch == (L'Z' ^ L'@')) {
			style = true;
			continue;
		} else if (style && ch == (L'V' ^ L'@')) {
			literal = true;
			continue;
		} else if (style) {
			keyStyle(ch);
		} else if (iswcntrl(ch)) {
			keyCtrl(ch);
		} else {
			editInsert(&edit, ch);
		}
		style = false;
		literal = false;
		if (spr) {
			spoilerReveal = false;
			mainUpdate();
		}
	}
	inputUpdate();
}

static const time_t Signatures[] = {
	0x6C72696774616301, // no heat, unread, unreadWarm
	0x6C72696774616302, // no self.pos
	0x6C72696774616303, // no buffer line heat
	0x6C72696774616304, // no mute
	0x6C72696774616305, // no URLs
	0x6C72696774616306, // no thresh
	0x6C72696774616307, // no window time
	0x6C72696774616308,
};

static size_t signatureVersion(time_t signature) {
	for (size_t i = 0; i < ARRAY_LEN(Signatures); ++i) {
		if (signature == Signatures[i]) return i;
	}
	errx(EX_DATAERR, "unknown file signature %jX", (uintmax_t)signature);
}

static int writeTime(FILE *file, time_t time) {
	return (fwrite(&time, sizeof(time), 1, file) ? 0 : -1);
}
static int writeString(FILE *file, const char *str) {
	return (fwrite(str, strlen(str) + 1, 1, file) ? 0 : -1);
}

static FILE *saveFile;

int uiSave(void) {
	int error = 0
		|| ftruncate(fileno(saveFile), 0)
		|| writeTime(saveFile, Signatures[7])
		|| writeTime(saveFile, self.pos);
	if (error) return error;
	for (uint num = 0; num < windows.len; ++num) {
		const struct Window *window = windows.ptrs[num];
		error = 0
			|| writeString(saveFile, idNames[window->id])
			|| writeTime(saveFile, window->mute)
			|| writeTime(saveFile, window->time)
			|| writeTime(saveFile, window->thresh)
			|| writeTime(saveFile, window->heat)
			|| writeTime(saveFile, window->unreadSoft)
			|| writeTime(saveFile, window->unreadWarm);
		if (error) return error;
		for (size_t i = 0; i < BufferCap; ++i) {
			const struct Line *line = bufferSoft(window->buffer, i);
			if (!line) continue;
			error = 0
				|| writeTime(saveFile, line->time)
				|| writeTime(saveFile, line->heat)
				|| writeString(saveFile, line->str);
			if (error) return error;
		}
		error = writeTime(saveFile, 0);
		if (error) return error;
	}
	return 0
		|| writeString(saveFile, "")
		|| urlSave(saveFile)
		|| fclose(saveFile);
}

static time_t readTime(FILE *file) {
	time_t time;
	fread(&time, sizeof(time), 1, file);
	if (ferror(file)) err(EX_IOERR, "fread");
	if (feof(file)) errx(EX_DATAERR, "unexpected eof");
	return time;
}
static ssize_t readString(FILE *file, char **buf, size_t *cap) {
	ssize_t len = getdelim(buf, cap, '\0', file);
	if (len < 0 && !feof(file)) err(EX_IOERR, "getdelim");
	return len;
}

void uiLoad(const char *name) {
	int error;
	saveFile = dataOpen(name, "a+e");
	if (!saveFile) exit(EX_CANTCREAT);
	rewind(saveFile);

#ifdef __FreeBSD__
	cap_rights_t rights;
	cap_rights_init(&rights, CAP_READ, CAP_WRITE, CAP_FLOCK, CAP_FTRUNCATE);
	error = caph_rights_limit(fileno(saveFile), &rights);
	if (error) err(EX_OSERR, "cap_rights_limit");
#endif

	error = flock(fileno(saveFile), LOCK_EX | LOCK_NB);
	if (error && errno == EWOULDBLOCK) {
		errx(EX_CANTCREAT, "%s: save file in use", name);
	}

	time_t signature;
	fread(&signature, sizeof(signature), 1, saveFile);
	if (ferror(saveFile)) err(EX_IOERR, "fread");
	if (feof(saveFile)) {
		return;
	}
	size_t version = signatureVersion(signature);

	if (version > 1) {
		self.pos = readTime(saveFile);
	}

	char *buf = NULL;
	size_t cap = 0;
	while (0 < readString(saveFile, &buf, &cap) && buf[0]) {
		struct Window *window = windows.ptrs[windowFor(idFor(buf))];
		if (version > 3) window->mute = readTime(saveFile);
		if (version > 6) window->time = readTime(saveFile);
		if (version > 5) window->thresh = readTime(saveFile);
		if (version > 0) {
			window->heat = readTime(saveFile);
			window->unreadSoft = readTime(saveFile);
			window->unreadWarm = readTime(saveFile);
		}
		for (;;) {
			time_t time = readTime(saveFile);
			if (!time) break;
			enum Heat heat = (version > 2 ? readTime(saveFile) : Cold);
			readString(saveFile, &buf, &cap);
			bufferPush(window->buffer, COLS, window->thresh, heat, time, buf);
		}
		windowReflow(window);
	}
	urlLoad(saveFile, version);

	free(buf);
}