aboutsummaryrefslogtreecommitdiff
path: root/sdn.cpp
blob: 58c24d552f234d437e9841a9115667bafa59a82e (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
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
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
//
// sdn: simple directory navigator
//
// Copyright (c) 2017 - 2021, Přemysl Eric Janouch <p@janouch.name>
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
// SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
// OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
// CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
//

// May be required for ncursesw and we generally want it all anyway
#define _XOPEN_SOURCE_EXTENDED

#include <string>
#include <vector>
#include <locale>
#include <iostream>
#include <algorithm>
#include <cwchar>
#include <climits>
#include <cstdlib>
#include <cstring>
#include <fstream>
#include <map>
#include <tuple>
#include <memory>

#include <unistd.h>
#include <dirent.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/acl.h>
#include <fcntl.h>
#include <pwd.h>
#include <grp.h>
#include <libgen.h>
#include <time.h>
#include <signal.h>

#include <sys/inotify.h>
#include <sys/xattr.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <acl/libacl.h>
#include <ncurses.h>

// Unicode is complex enough already and we might make assumptions
#ifndef __STDC_ISO_10646__
#error Unicode required for wchar_t
#endif

// Trailing return types make C++ syntax suck considerably less
#define fun static auto

#ifndef A_ITALIC
#define A_ITALIC 0
#endif

using namespace std;

// For some reason handling of encoding in C and C++ is extremely annoying
// and C++17 ironically obsoletes C++11 additions that made it less painful
fun to_wide (const string &multi) -> wstring {
	wstring wide; wchar_t w; mbstate_t mb {};
	size_t n = 0, len = multi.length () + 1;
	while (auto res = mbrtowc (&w, multi.c_str () + n, len - n, &mb)) {
		if (res == size_t (-1) || res == size_t (-2))
			return L"/invalid encoding/";

		n += res;
		wide += w;
	}
	return wide;
}

fun to_mb (const wstring &wide) -> string {
	string mb; char buf[MB_LEN_MAX + 1]; mbstate_t mbs {};
	for (size_t n = 0; n <= wide.length (); n++) {
		auto res = wcrtomb (buf, wide.c_str ()[n], &mbs);
		if (res == size_t (-1))
			throw invalid_argument ("invalid encoding");
		mb.append (buf, res);
	}
	// There's one extra NUL character added by wcrtomb()
	mb.erase (mb.length () - 1);
	return mb;
}

fun prefix_length (const wstring &in, const wstring &of) -> size_t {
	size_t score = 0;
	for (size_t i = 0; i < of.size () && in.size () >= i && in[i] == of[i]; i++)
		score++;
	return score;
}

// TODO: this omits empty elements, check usages
fun split (const string &s, const string &sep, vector<string> &out) {
	size_t mark = 0, p = s.find (sep);
	for (; p != string::npos; p = s.find (sep, (mark = p + sep.length ())))
		if (mark < p)
			out.push_back (s.substr (mark, p - mark));
	if (mark < s.length ())
		out.push_back (s.substr (mark));
}

fun split (const string &s, const string &sep) -> vector<string> {
	vector<string> result; split (s, sep, result); return result;
}

fun untilde (const string &path) -> string {
	if (path.empty ())
		return path;

	string tail = path.substr (1);
	if (path[0] == '\\')
		return tail;
	if (path[0] != '~')
		return path;

	// If there is something between the ~ and the first / (or the EOS)
	if (size_t until_slash = strcspn (tail.c_str (), "/")) {
		if (const auto *pw = getpwnam (tail.substr (0, until_slash).c_str ()))
			return pw->pw_dir + tail.substr (until_slash);
	} else if (const auto *home = getenv ("HOME")) {
		return home + tail;
	} else if (const auto *pw = getpwuid (getuid ())) {
		return pw->pw_dir + tail;
	}
	return path;
}

fun needs_shell_quoting (const string &v) -> bool {
	// IEEE Std 1003.1 sh + the exclamation mark because of csh/bash
	// history expansion, implicitly also the NUL character
	for (auto c : v)
		if (strchr ("|&;<>()$`\\\"' \t\n" "*?[#˜=%" "!", c))
			return true;
	return v.empty ();
}

fun shell_escape (const string &v) -> string {
	if (!needs_shell_quoting (v))
		return v;

	string result;
	for (auto c : v)
		if (c == '\'')
			result += "'\\''";
		else
			result += c;
	return "'" + result + "'";
}

fun parse_line (istream &is, vector<string> &out) -> bool {
	enum {STA, DEF, COM, ESC, WOR, QUO, STATES};
	enum {TAKE = 1 << 3, PUSH = 1 << 4, STOP = 1 << 5, ERROR = 1 << 6};
	enum {TWOR = TAKE | WOR};

	// We never transition back to the start state, so it can stay as a no-op
	static char table[STATES][7] = {
	// state   EOF          SP, TAB     '     #     \     LF           default
	/* STA */ {ERROR,       DEF,        QUO,  COM,  ESC,  STOP,        TWOR},
	/* DEF */ {STOP,        0,          QUO,  COM,  ESC,  STOP,        TWOR},
	/* COM */ {STOP,        0,          0,    0,    0,    STOP,        0},
	/* ESC */ {ERROR,       TWOR,       TWOR, TWOR, TWOR, TWOR,        TWOR},
	/* WOR */ {STOP | PUSH, DEF | PUSH, QUO,  TAKE, ESC,  STOP | PUSH, TAKE},
	/* QUO */ {ERROR,       TAKE,       WOR,  TAKE, TAKE, TAKE,        TAKE},
	};

	out.clear (); string token; int state = STA;
	constexpr auto eof = istream::traits_type::eof ();
	while (1) {
		int ch = is.get (), edge = 0;
		switch (ch) {
		case eof:  edge = table[state][0]; break;
		case '\t':
		case ' ':  edge = table[state][1]; break;
		case '\'': edge = table[state][2]; break;
		case '#':  edge = table[state][3]; break;
		case '\\': edge = table[state][4]; break;
		case '\n': edge = table[state][5]; break;
		default:   edge = table[state][6]; break;
		}
		if (edge & TAKE)
			token += ch;
		if (edge & PUSH) {
			out.push_back (token);
			token.clear ();
		}
		if (edge & STOP)
			return true;
		if (edge & ERROR)
			return false;
		if (edge &= 7)
			state = edge;
	}
}

fun write_line (ostream &os, const vector<string> &in) {
	if (!in.empty ())
		os << shell_escape (in.at (0));
	for (size_t i = 1; i < in.size (); i++)
		os << " " << shell_escape (in.at (i));
	os << endl;
}

fun decode_type (mode_t m) -> wchar_t {
	if (S_ISDIR  (m)) return L'd'; if (S_ISBLK  (m)) return L'b';
	if (S_ISCHR  (m)) return L'c'; if (S_ISLNK  (m)) return L'l';
	if (S_ISFIFO (m)) return L'p'; if (S_ISSOCK (m)) return L's';
	if (S_ISREG  (m)) return L'-';
	return L'?';
}

/// Return the modes of a file in the usual stat/ls format
fun decode_mode (mode_t m) -> wstring {
	return {decode_type (m),
		L"r-"[!(m & S_IRUSR)],
		L"w-"[!(m & S_IWUSR)],
		((m & S_ISUID) ? L"sS" : L"x-")[!(m & S_IXUSR)],
		L"r-"[!(m & S_IRGRP)],
		L"w-"[!(m & S_IWGRP)],
		((m & S_ISGID) ? L"sS" : L"x-")[!(m & S_IXGRP)],
		L"r-"[!(m & S_IROTH)],
		L"w-"[!(m & S_IWOTH)],
		((m & S_ISVTX) ? L"tT" : L"x-")[!(m & S_IXOTH)]};
}

template<class T> fun shift (vector<T> &v) -> T {
	auto front = v.front (); v.erase (begin (v)); return front;
}

fun capitalize (const string &s) -> string {
	string result;
	for (auto c : s)
		result += result.empty () ? toupper (c) : tolower (c);
	return result;
}

/// Underlining for teletypes (also called overstriking),
/// also imitated in more(1) and less(1)
fun underline (const string& s) -> string {
	string result;
	for (auto c : s)
		result.append ({c, 8, '_'});
	return result;
}

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

fun xdg_config_home () -> string {
	const char *user_dir = getenv ("XDG_CONFIG_HOME");
	if (user_dir && user_dir[0] == '/')
		return user_dir;

	const char *home_dir = getenv ("HOME");
	return string (home_dir ? home_dir : "") + "/.config";
}

// In C++17 we will get <optional> but until then there's unique_ptr
fun xdg_config_find (const string &suffix) -> unique_ptr<ifstream> {
	vector<string> dirs {xdg_config_home ()};
	const char *system_dirs = getenv ("XDG_CONFIG_DIRS");
	split ((system_dirs && *system_dirs) ? system_dirs : "/etc/xdg", ":", dirs);
	for (const auto &dir : dirs) {
		if (dir[0] != '/')
			continue;
		auto ifs = make_unique<ifstream>
			(dir + "/" PROJECT_NAME "/" + suffix);
		if (*ifs)
			return ifs;
	}
	return nullptr;
}

fun xdg_config_write (const string &suffix) -> unique_ptr<fstream> {
	auto dir = xdg_config_home ();
	if (dir[0] == '/') {
		auto path = dir + "/" PROJECT_NAME "/" + suffix;
		if (!fork ())
			_exit (-execlp ("mkdir", "mkdir", "-p",
				dirname (strdup (path.c_str ())), NULL));
		auto fs = make_unique<fstream>
			(path, fstream::in | fstream::out | fstream::trunc);
		if (*fs)
			return fs;
	}
	return nullptr;
}

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

using ncstring = basic_string<cchar_t>;

fun cchar (chtype attrs, wchar_t c) -> cchar_t {
	cchar_t ch {}; wchar_t ws[] = {c, 0};
	setcchar (&ch, ws, attrs, PAIR_NUMBER (attrs), nullptr);
	return ch;
}

fun decolor (cchar_t &ch) {
	wchar_t c[CCHARW_MAX]; attr_t attrs; short pair;
	getcchar (&ch, c, &attrs, &pair, nullptr);
	setcchar (&ch, c, attrs &~ A_REVERSE, 0, nullptr);
}

fun invert (cchar_t &ch) {
	wchar_t c[CCHARW_MAX]; attr_t attrs; short pair;
	getcchar (&ch, c, &attrs, &pair, nullptr);
	setcchar (&ch, c, attrs ^ A_REVERSE, 0, nullptr);
}

fun apply_attrs (const wstring &w, attr_t attrs) -> ncstring {
	ncstring res;
	for (auto c : w)
		res += cchar (attrs, c);
	return res;
}

fun sanitize_char (chtype attrs, wchar_t c) -> ncstring {
	if (c < 32 || c == 0x7f)
		return {cchar (attrs | A_REVERSE, L'^'),
				cchar (attrs | A_REVERSE, (c + 64) & 0x7f)};
	if (!iswprint (c))
		return {cchar (attrs | A_REVERSE, L'?')};
	return {cchar (attrs, c)};
}

fun sanitize (const ncstring &nc) -> ncstring {
	ncstring out;
	for (cchar_t c : nc)
		for (size_t i = 0; i < CCHARW_MAX && c.chars[i]; i++)
			out += sanitize_char (c.attr, c.chars[i]);
	return out;
}

fun print (const ncstring &nc, int limit) -> int {
	int total_width = 0;
	for (cchar_t c : sanitize (nc)) {
		int width = wcwidth (c.chars[0]);
		if (total_width + width > limit)
			break;

		add_wch (&c);
		total_width += width;
	}
	return total_width;
}

fun compute_width (const ncstring &nc) -> int {
	int total = 0;
	for (const auto &c : nc)
		total += wcwidth (c.chars[0]);
	return total;
}

// TODO: maybe we need formatting for the padding passed in?
fun align (const ncstring &nc, int target) -> ncstring {
	auto current = compute_width (nc);
	auto missing = abs (target) - current;
	if (missing <= 0)
		return nc;
	return target < 0
		? nc + apply_attrs (wstring (missing, L' '), 0)
		: apply_attrs (wstring (missing, L' '), 0) + nc;
}

fun allocate_pair (short fg, short bg) -> short {
	static short counter = 1; init_pair (counter, fg, bg); return counter++;
}

fun decode_attrs (const vector<string> &attrs) -> chtype {
	chtype result = 0; int fg = -1, bg = -1, colors = 0;
	for (const auto &s : attrs) {
		char *end; auto color = strtol (s.c_str (), &end, 10);
		if (!*end && color >= -1 && color < COLORS) {
			if    (++colors == 1) fg = color;
			else if (colors == 2) bg = color;
		}
		else if (s == "bold")    result |= A_BOLD;
		else if (s == "dim")     result |= A_DIM;
		else if (s == "ul")      result |= A_UNDERLINE;
		else if (s == "blink")   result |= A_BLINK;
		else if (s == "reverse") result |= A_REVERSE;
		else if (s == "italic")  result |= A_ITALIC;
	}
	if (fg != -1 || bg != -1)
		result |= COLOR_PAIR (allocate_pair (fg, bg));
	return result;
}

// --- Application -------------------------------------------------------------

enum { ALT = 1 << 24, SYM = 1 << 25 };  // Outside the range of Unicode
#define KEY(name) (SYM | KEY_ ## name)
#define CTRL(char) ((char) == '?' ? 0x7f : (char) & 0x1f)

#define ACTIONS(XX) XX(NONE) XX(HELP) XX(QUIT) XX(QUIT_NO_CHDIR) \
	XX(CHOOSE) XX(CHOOSE_FULL) XX(VIEW) XX(EDIT) XX(SORT_LEFT) XX(SORT_RIGHT) \
	XX(UP) XX(DOWN) XX(TOP) XX(BOTTOM) XX(HIGH) XX(MIDDLE) XX(LOW) \
	XX(PAGE_PREVIOUS) XX(PAGE_NEXT) XX(SCROLL_UP) XX(SCROLL_DOWN) \
	XX(CHDIR) XX(PARENT) XX(GO_START) XX(GO_HOME) \
	XX(SEARCH) XX(RENAME) XX(RENAME_PREFILL) XX(MKDIR) \
	XX(TOGGLE_FULL) XX(REVERSE_SORT) XX(SHOW_HIDDEN) XX(REDRAW) XX(RELOAD) \
	XX(INPUT_ABORT) XX(INPUT_CONFIRM) XX(INPUT_B_DELETE) XX(INPUT_DELETE) \
	XX(INPUT_B_KILL_LINE) XX(INPUT_KILL_LINE) XX(INPUT_QUOTED_INSERT) \
	XX(INPUT_BACKWARD) XX(INPUT_FORWARD) XX(INPUT_BEGINNING) XX(INPUT_END)

#define XX(name) ACTION_ ## name,
enum action { ACTIONS(XX) ACTION_COUNT };
#undef XX

#define XX(name) #name,
static const char *g_action_names[] = {ACTIONS(XX)};
#undef XX

static map<wint_t, action> g_normal_actions {
	{ALT | '\r', ACTION_CHOOSE_FULL}, {ALT | KEY (ENTER), ACTION_CHOOSE_FULL},
	{'\r', ACTION_CHOOSE}, {KEY (ENTER), ACTION_CHOOSE},
	{KEY (F (1)), ACTION_HELP}, {'h', ACTION_HELP},
	{KEY (F (3)), ACTION_VIEW}, {KEY (F (4)), ACTION_EDIT},
	{'q', ACTION_QUIT}, {ALT | 'q', ACTION_QUIT_NO_CHDIR},
	// M-o ought to be the same shortcut the navigator is launched with
	{ALT | 'o', ACTION_QUIT},
	{'<', ACTION_SORT_LEFT}, {'>', ACTION_SORT_RIGHT},
	{'k', ACTION_UP}, {CTRL ('P'), ACTION_UP}, {KEY (UP), ACTION_UP},
	{'j', ACTION_DOWN}, {CTRL ('N'), ACTION_DOWN}, {KEY (DOWN), ACTION_DOWN},
	{'g', ACTION_TOP}, {ALT | '<', ACTION_TOP}, {KEY (HOME), ACTION_TOP},
	{'G', ACTION_BOTTOM}, {ALT | '>', ACTION_BOTTOM}, {KEY(END), ACTION_BOTTOM},
	{'H', ACTION_HIGH}, {'M', ACTION_MIDDLE}, {'L', ACTION_LOW},
	{KEY (PPAGE), ACTION_PAGE_PREVIOUS}, {KEY (NPAGE), ACTION_PAGE_NEXT},
	{CTRL ('Y'), ACTION_SCROLL_UP}, {CTRL ('E'), ACTION_SCROLL_DOWN},
	{'c', ACTION_CHDIR}, {ALT | KEY (UP), ACTION_PARENT},
	{'&', ACTION_GO_START}, {'~', ACTION_GO_HOME},
	{'/', ACTION_SEARCH},  {'s', ACTION_SEARCH},
	{ALT | 'e', ACTION_RENAME_PREFILL}, {'e', ACTION_RENAME},
	{KEY (F (6)), ACTION_RENAME_PREFILL}, {KEY (F (7)), ACTION_MKDIR},
	{'t', ACTION_TOGGLE_FULL}, {ALT | 't', ACTION_TOGGLE_FULL},
	{'R', ACTION_REVERSE_SORT}, {ALT | '.', ACTION_SHOW_HIDDEN},
	{CTRL ('L'), ACTION_REDRAW}, {'r', ACTION_RELOAD},
};
static map<wint_t, action> g_input_actions {
	{27, ACTION_INPUT_ABORT}, {CTRL ('G'), ACTION_INPUT_ABORT},
	{L'\r', ACTION_INPUT_CONFIRM}, {KEY (ENTER), ACTION_INPUT_CONFIRM},
	// Sometimes terminfo is wrong, we need to accept both of these
	{L'\b', ACTION_INPUT_B_DELETE}, {CTRL ('?'), ACTION_INPUT_B_DELETE},
	{KEY (BACKSPACE), ACTION_INPUT_B_DELETE}, {KEY (DC), ACTION_INPUT_DELETE},
	{CTRL ('D'), ACTION_INPUT_DELETE}, {CTRL ('U'), ACTION_INPUT_B_KILL_LINE},
	{CTRL ('K'), ACTION_INPUT_KILL_LINE},
	{CTRL ('V'), ACTION_INPUT_QUOTED_INSERT},
	{CTRL ('B'), ACTION_INPUT_BACKWARD}, {KEY (LEFT), ACTION_INPUT_BACKWARD},
	{CTRL ('F'), ACTION_INPUT_FORWARD}, {KEY (RIGHT), ACTION_INPUT_FORWARD},
	{CTRL ('A'), ACTION_INPUT_BEGINNING}, {KEY (HOME), ACTION_INPUT_BEGINNING},
	{CTRL ('E'), ACTION_INPUT_END}, {KEY (END), ACTION_INPUT_END},
};
static map<wint_t, action> g_search_actions {
	{CTRL ('P'), ACTION_UP}, {KEY (UP), ACTION_UP},
	{CTRL ('N'), ACTION_DOWN}, {KEY (DOWN), ACTION_DOWN},
};
static const map<string, map<wint_t, action>*> g_binding_contexts {
	{"normal", &g_normal_actions}, {"input", &g_input_actions},
	{"search", &g_search_actions},
};

#define LS(XX) XX(NORMAL, "no") XX(FILE, "fi") XX(RESET, "rs") \
	XX(DIRECTORY, "di") XX(SYMLINK, "ln") XX(MULTIHARDLINK, "mh") \
	XX(FIFO, "pi") XX(SOCKET, "so") XX(DOOR, "do") XX(BLOCK, "bd") \
	XX(CHARACTER, "cd") XX(ORPHAN, "or") XX(MISSING, "mi") XX(SETUID, "su") \
	XX(SETGID, "sg") XX(CAPABILITY, "ca") XX(STICKY_OTHER_WRITABLE, "tw") \
	XX(OTHER_WRITABLE, "ow") XX(STICKY, "st") XX(EXECUTABLE, "ex")

#define XX(id, name) LS_ ## id,
enum { LS(XX) LS_COUNT };
#undef XX

#define XX(id, name) name,
static const char *g_ls_colors[] = {LS(XX)};
#undef XX

struct stringcaseless {
	bool operator () (const string &a, const string &b) const {
		const auto &c = locale::classic();
		return lexicographical_compare (begin (a), end (a), begin (b), end (b),
			[&](char m, char n) { return tolower (m, c) < tolower (n, c); });
	}
};

struct entry {
	string filename, target_path;
	struct stat info = {}, target_info = {};

	enum { MODES, USER, GROUP, SIZE, MTIME, FILENAME, COLUMNS };
	ncstring cols[COLUMNS];
};

struct level {
	int offset, cursor;                 ///< Scroll offset and cursor position
	string path, filename;              ///< Level path and filename at cursor
};

static struct {
	ncstring cmdline;                   ///< Outer command line
	string cwd;                         ///< Current working directory
	string start_dir;                   ///< Starting directory
	vector<entry> entries;              ///< Current directory entries
	vector<level> levels;               ///< Upper directory levels
	int offset, cursor;                 ///< Scroll offset and cursor position
	bool full_view;                     ///< Show extended information
	bool gravity;                       ///< Entries are shoved to the bottom
	bool reverse_sort;                  ///< Reverse sort
	bool show_hidden;                   ///< Show hidden files
	bool ext_helpers;                   ///< Launch helpers externally
	int max_widths[entry::COLUMNS];     ///< Column widths
	int sort_column = entry::FILENAME;  ///< Sorting column
	int sort_flash_ttl;                 ///< Sorting column flash TTL

	wstring message;                    ///< Message for the user
	int message_ttl;                    ///< Time to live for the message

	string chosen;                      ///< Chosen item for the command line
	string ext_helper;                  ///< External helper to run
	bool no_chdir;                      ///< Do not tell the shell to chdir
	bool quitting;                      ///< Whether we should quit already

	int inotify_fd, inotify_wd = -1;    ///< File watch
	bool out_of_date;                   ///< Entries may be out of date

	const wchar_t *editor;              ///< Prompt string for editing
	wstring editor_info;                ///< Right-side prompt while editing
	wstring editor_line;                ///< Current user input
	int editor_cursor = 0;              ///< Cursor position
	bool editor_inserting;              ///< Inserting a literal character
	void (*editor_on_change) ();        ///< Callback on editor change
	void (*editor_on_confirm) ();       ///< Callback on editor confirmation
	map<action, void (*) ()> editor_on; ///< Handlers for custom actions

	enum { AT_CURSOR, AT_BAR, AT_CWD, AT_INPUT, AT_INFO, AT_CMDLINE, AT_COUNT };
	chtype attrs[AT_COUNT] = {A_REVERSE, 0, A_BOLD, 0, A_ITALIC, 0};
	const char *attr_names[AT_COUNT] =
		{"cursor", "bar", "cwd", "input", "info", "cmdline"};

	map<int, chtype> ls_colors;         ///< LS_COLORS decoded
	map<string, chtype> ls_exts;        ///< LS_COLORS file extensions
	bool ls_symlink_as_target;          ///< ln=target in dircolors

	map<string, wint_t, stringcaseless> name_to_key;
	map<wint_t, string> key_to_name;
	map<string, wint_t> custom_keys;
	string action_names[ACTION_COUNT];  ///< Stylized action names

	// Refreshed by reload():

	map<uid_t, string> unames;          ///< User names by UID
	map<gid_t, string> gnames;          ///< Group names by GID
	struct tm now;                      ///< Current local time for display
} g;

// The coloring logic has been more or less exactly copied from GNU ls,
// simplified and rewritten to reflect local implementation specifics
fun ls_is_colored (int type) -> bool {
	auto i = g.ls_colors.find (type);
	return i != g.ls_colors.end () && i->second != 0;
}

fun ls_format (const entry &e, bool for_target) -> chtype {
	int type = LS_ORPHAN;
	auto set = [&](int t) { if (ls_is_colored (t)) type = t; };

	const auto &name = for_target
		? e.target_path : e.filename;
	const auto &info =
		(for_target || (g.ls_symlink_as_target && e.target_info.st_mode))
		? e.target_info : e.info;

	if (for_target && info.st_mode == 0) {
		// This differs from GNU ls: we use ORPHAN when MISSING is not set,
		// but GNU ls colors by dirent::d_type
		set (LS_MISSING);
	} else if (S_ISREG (info.st_mode)) {
		type = LS_FILE;
		if (info.st_nlink > 1)
			set (LS_MULTIHARDLINK);
		if ((info.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH)))
			set (LS_EXECUTABLE);
		if (lgetxattr (name.c_str (), "security.capability", NULL, 0) >= 0)
			set (LS_CAPABILITY);
		if ((info.st_mode & S_ISGID))
			set (LS_SETGID);
		if ((info.st_mode & S_ISUID))
			set (LS_SETUID);
	} else if (S_ISDIR (info.st_mode)) {
		type = LS_DIRECTORY;
		if ((info.st_mode & S_ISVTX))
			set (LS_STICKY);
		if ((info.st_mode & S_IWOTH))
			set (LS_OTHER_WRITABLE);
		if ((info.st_mode & S_ISVTX) && (info.st_mode & S_IWOTH))
			set (LS_STICKY_OTHER_WRITABLE);
	} else if (S_ISLNK (info.st_mode)) {
		type = LS_SYMLINK;
		if (!e.target_info.st_mode
		 && (ls_is_colored (LS_ORPHAN) || g.ls_symlink_as_target))
			type = LS_ORPHAN;
	} else if (S_ISFIFO (info.st_mode)) {
		type = LS_FIFO;
	} else if (S_ISSOCK (info.st_mode)) {
		type = LS_SOCKET;
	} else if (S_ISBLK (info.st_mode)) {
		type = LS_BLOCK;
	} else if (S_ISCHR (info.st_mode)) {
		type = LS_CHARACTER;
	}

	chtype format = 0;
	const auto x = g.ls_colors.find (type);
	if (x != g.ls_colors.end ())
		format = x->second;

	auto dot = name.find_last_of ('.');
	if (dot != string::npos && type == LS_FILE) {
		const auto x = g.ls_exts.find (name.substr (++dot));
		if (x != g.ls_exts.end ())
			format = x->second;
	}
	return format;
}

fun make_entry (const struct dirent *f) -> entry {
	entry e;
	e.filename = f->d_name;
	e.info.st_mode = DTTOIF (f->d_type);
	auto &info = e.info;

	// io_uring is only at most about 50% faster, though it might help with
	// slowly statting devices, at a major complexity cost.
	if (lstat (f->d_name, &info)) {
		e.cols[entry::MODES] = apply_attrs ({ decode_type (info.st_mode),
			L'?', L'?', L'?', L'?', L'?', L'?', L'?', L'?', L'?' }, 0);

		e.cols[entry::USER] = e.cols[entry::GROUP] =
		e.cols[entry::SIZE] = e.cols[entry::MTIME] = apply_attrs (L"?", 0);

		e.cols[entry::FILENAME] =
			apply_attrs (to_wide (e.filename), ls_format (e, false));
		return e;
	}

	if (S_ISLNK (info.st_mode)) {
		char buf[PATH_MAX] = {};
		auto len = readlink (f->d_name, buf, sizeof buf);
		if (len < 0 || size_t (len) >= sizeof buf) {
			e.target_path = "?";
		} else {
			e.target_path = buf;
			// If a symlink links to another symlink, we follow all the way
			(void) stat (buf, &e.target_info);
		}
	}

	auto mode = decode_mode (info.st_mode);
	// We're using a laughably small subset of libacl: this translates to
	// two lgetxattr() calls, the results of which are compared with
	// specific architecture-dependent constants.  Linux-only.
	if (acl_extended_file_nofollow (f->d_name) > 0)
		mode += L"+";
	e.cols[entry::MODES] = apply_attrs (mode, 0);

	auto usr = g.unames.find (info.st_uid);
	e.cols[entry::USER] = (usr != g.unames.end ())
		? apply_attrs (to_wide (usr->second), 0)
		: apply_attrs (to_wstring (info.st_uid), 0);

	auto grp = g.gnames.find (info.st_gid);
	e.cols[entry::GROUP] = (grp != g.gnames.end ())
		? apply_attrs (to_wide (grp->second), 0)
		: apply_attrs (to_wstring (info.st_gid), 0);

	auto size = to_wstring (info.st_size);
	if      (info.st_size >> 40) size = to_wstring (info.st_size >> 40) + L"T";
	else if (info.st_size >> 30) size = to_wstring (info.st_size >> 30) + L"G";
	else if (info.st_size >> 20) size = to_wstring (info.st_size >> 20) + L"M";
	else if (info.st_size >> 10) size = to_wstring (info.st_size >> 10) + L"K";
	e.cols[entry::SIZE] = apply_attrs (size, 0);

	char buf[32] = "";
	auto tm = localtime (&info.st_mtime);
	strftime (buf, sizeof buf,
		(tm->tm_year == g.now.tm_year) ? "%b %e %H:%M" : "%b %e  %Y", tm);
	e.cols[entry::MTIME] = apply_attrs (to_wide (buf), 0);

	auto &fn = e.cols[entry::FILENAME] =
		apply_attrs (to_wide (e.filename), ls_format (e, false));
	if (!e.target_path.empty ()) {
		fn.append (apply_attrs (to_wide (" -> "), 0));
		fn.append (apply_attrs (to_wide (e.target_path), ls_format (e, true)));
	}
	return e;
}

fun inline visible_lines () -> int { return max (0, LINES - 2); }

fun update () {
	int start_column = g.full_view ? 0 : entry::FILENAME;
	static int alignment[entry::COLUMNS] = { -1, -1, -1, 1, 1, -1 };
	erase ();

	int available = visible_lines ();
	int all = g.entries.size ();
	int used = min (available, all - g.offset);
	for (int i = 0; i < used; i++) {
		auto index = g.offset + i;
		bool selected = index == g.cursor;
		attrset (selected ? g.attrs[g.AT_CURSOR] : 0);
		move (g.gravity ? (available - used + i) : i, 0);

		auto used = 0;
		for (int col = start_column; col < entry::COLUMNS; col++) {
			const auto &field = g.entries[index].cols[col];
			auto aligned = align (field, alignment[col] * g.max_widths[col]);
			if (g.sort_flash_ttl && col == g.sort_column)
				for_each (begin (aligned), end (aligned), invert);
			if (selected)
				for_each (begin (aligned), end (aligned), decolor);
			used += print (aligned + apply_attrs (L" ", 0), COLS - used);
		}
		hline (' ', COLS - used);
	}

	auto bar = apply_attrs (to_wide (g.cwd), g.attrs[g.AT_CWD]);
	if (!g.show_hidden)
		bar += apply_attrs (L" (hidden)", 0);
	if (g.out_of_date)
		bar += apply_attrs (L" [+]", 0);

	move (LINES - 2, 0);
	attrset (g.attrs[g.AT_BAR]);
	int unused = COLS - print (bar, COLS);
	hline (' ', unused);

	auto pos = to_wstring (int (double (g.offset) / all * 100)) + L"%";
	if (used == all)
		pos = L"All";
	else if (g.offset == 0)
		pos = L"Top";
	else if (g.offset + used == all)
		pos = L"Bot";

	if (int (pos.size ()) < unused)
		mvaddwstr (LINES - 2, COLS - pos.size (), pos.c_str ());

	attrset (g.attrs[g.AT_INPUT]);
	curs_set (0);
	if (g.editor) {
		move (LINES - 1, 0);
		auto prompt = apply_attrs (wstring (g.editor) + L": ", 0),
			line = apply_attrs (g.editor_line, 0),
			info = apply_attrs (g.editor_info, g.attrs[g.AT_INFO]);

		auto info_width = compute_width (info);
		if (print (prompt + line, COLS - 1) < COLS - info_width) {
			move (LINES - 1, COLS - info_width);
			print (info, info_width);
		}

		auto start = sanitize (prompt + line.substr (0, g.editor_cursor));
		move (LINES - 1, compute_width (start));
		curs_set (1);
	} else if (!g.message.empty ()) {
		move (LINES - 1, 0);
		print (apply_attrs (g.message, 0), COLS);
	} else if (!g.cmdline.empty ()) {
		move (LINES - 1, 0);
		print (g.cmdline, COLS);
	}

	refresh ();
}

fun operator< (const entry &e1, const entry &e2) -> bool {
	auto t1 = make_tuple (e1.filename != "..",
		!S_ISDIR (e1.info.st_mode) && !S_ISDIR (e1.target_info.st_mode));
	auto t2 = make_tuple (e2.filename != "..",
		!S_ISDIR (e2.info.st_mode) && !S_ISDIR (e2.target_info.st_mode));
	if (t1 != t2)
		return t1 < t2;

	const auto &a = g.reverse_sort ? e2 : e1;
	const auto &b = g.reverse_sort ? e1 : e2;
	switch (g.sort_column) {
	case entry::MODES:
		if (a.info.st_mode != b.info.st_mode)
			return a.info.st_mode < b.info.st_mode;
		break;
	case entry::USER:
		if (a.info.st_uid != b.info.st_uid)
			return a.info.st_uid < b.info.st_uid;
		break;
	case entry::GROUP:
		if (a.info.st_gid != b.info.st_gid)
			return a.info.st_gid < b.info.st_gid;
		break;
	case entry::SIZE:
		if (a.info.st_size != b.info.st_size)
			return a.info.st_size < b.info.st_size;
		break;
	case entry::MTIME:
		if (a.info.st_mtime != b.info.st_mtime)
			return a.info.st_mtime < b.info.st_mtime;
		break;
	}
	return a.filename < b.filename;
}

fun at_cursor () -> const entry & {
	static entry invalid;
	return g.cursor >= int (g.entries.size ()) ? invalid : g.entries[g.cursor];
}

fun resort (const string anchor = at_cursor ().filename) {
	sort (begin (g.entries), end (g.entries));
	if (!anchor.empty ()) {
		for (size_t i = 0; i < g.entries.size (); i++)
			if (g.entries[i].filename == anchor)
				g.cursor = i;
	}
}

fun reload (bool keep_anchor) {
	g.unames.clear();
	while (auto *ent = getpwent ())
		g.unames.emplace (ent->pw_uid, ent->pw_name);
	endpwent();

	g.gnames.clear();
	while (auto *ent = getgrent ())
		g.gnames.emplace (ent->gr_gid, ent->gr_name);
	endgrent();

	string anchor;
	if (keep_anchor)
		anchor = at_cursor ().filename;

	auto now = time (NULL); g.now = *localtime (&now);
	auto dir = opendir (".");
	g.entries.clear ();
	while (auto f = readdir (dir)) {
		string name = f->d_name;
		// Two dots are for navigation but this ain't as useful
		if (name == ".")
			continue;
		if (name == ".." ? g.cwd != "/" : (name[0] != '.' || g.show_hidden))
			g.entries.push_back (make_entry (f));
	}
	closedir (dir);

	g.out_of_date = false;
	for (int col = 0; col < entry::COLUMNS; col++) {
		auto &longest = g.max_widths[col] = 0;
		for (const auto &entry : g.entries)
			longest = max (longest, compute_width (entry.cols[col]));
	}

	resort (anchor);

	g.cursor = max (0, min (g.cursor, int (g.entries.size ()) - 1));
	g.offset = max (0, min (g.offset, int (g.entries.size ()) - 1));

	if (g.inotify_wd != -1)
		inotify_rm_watch (g.inotify_fd, g.inotify_wd);

	// We don't show atime, so access and open are merely spam
	g.inotify_wd = inotify_add_watch (g.inotify_fd, ".",
		(IN_ALL_EVENTS | IN_ONLYDIR | IN_EXCL_UNLINK) & ~(IN_ACCESS | IN_OPEN));
}

fun show_message (const string &message, int ttl = 30) {
	g.message = to_wide (message);
	g.message_ttl = ttl;
}

fun run_program (initializer_list<const char*> list, const string &filename) {
	if (g.ext_helpers) {
		// XXX: this doesn't try them all out, though it shouldn't make any
		// noticeable difference
		const char *found = nullptr;
		for (auto program : list)
			if ((found = program))
				break;
		g.ext_helper = found + (" " + shell_escape (filename));
		g.quitting = true;
		return;
	}

	endwin ();
	switch (pid_t child = fork ()) {
		int status;
	case -1:
		break;
	case 0:
		// Put the child in a new foreground process group...
		setpgid (0, 0);
		tcsetpgrp (STDOUT_FILENO, getpgid (0));

		for (auto program : list)
			if (program) execl ("/bin/sh", "/bin/sh", "-c", (string (program)
				+ " " + shell_escape (filename)).c_str (), NULL);
		_exit (EXIT_FAILURE);
	default:
		// ...and make sure of it in the parent as well
		(void) setpgid (child, child);

		// We don't provide job control--don't let us hang after ^Z
		while (waitpid (child, &status, WUNTRACED) > -1 && WIFSTOPPED (status))
			if (WSTOPSIG (status) == SIGTSTP)
				kill (-child, SIGCONT);
		tcsetpgrp (STDOUT_FILENO, getpgid (0));

		if (WIFEXITED (status) && WEXITSTATUS (status)) {
			printf ("Helper returned non-zero exit status %d.  "
				"Press Enter to continue.\n", WEXITSTATUS (status));
			string dummy; getline (cin, dummy);
		}
	}

	refresh ();
	update ();
}

fun view (const string &filename) {
	// XXX: we cannot realistically detect that the pager hasn't made a pause
	// at the end of the file, so we can't ensure all contents have been seen
	run_program ({(const char *) getenv ("PAGER"), "less", "cat"}, filename);
}

fun edit (const string &filename) {
	run_program ({(const char *) getenv ("VISUAL"),
		(const char *) getenv ("EDITOR"), "vi"}, filename);
}

fun run_pager (FILE *contents) {
	// We don't really need to set O_CLOEXEC, so we're not going to
	rewind (contents);
	endwin ();

	switch (pid_t child = fork ()) {
		int status;
	case -1:
		break;
	case 0:
		// Put the child in a new foreground process group...
		setpgid (0, 0);
		tcsetpgrp (STDOUT_FILENO, getpgid (0));
		dup2 (fileno (contents), STDIN_FILENO);

		// Behaviour copies man-db's man(1), similar to POSIX man(1)
		for (auto pager : {(const char *) getenv ("PAGER"), "less", "cat"})
			if (pager) execl ("/bin/sh", "/bin/sh", "-c", pager, NULL);
		_exit (EXIT_FAILURE);
	default:
		// ...and make sure of it in the parent as well
		(void) setpgid (child, child);
		waitpid (child, &status, 0);
		tcsetpgrp (STDOUT_FILENO, getpgid (0));
	}

	refresh ();
	update ();
}

fun encode_key (wint_t key) -> string {
	string encoded;
	if (key & ALT)
		encoded.append ("M-");
	wchar_t bare = key & ~ALT;
	if (g.key_to_name.count (bare))
		encoded.append (capitalize (g.key_to_name.at (bare)));
	else if (bare < 32 || bare == 0x7f)
		encoded.append ("C-").append ({char (tolower ((bare + 64) & 0x7f))});
	else
		encoded.append (to_mb ({bare}));
	return encoded;
}

fun show_help () {
	FILE *contents = tmpfile ();
	if (!contents)
		return;

	for (const auto &kv : g_binding_contexts) {
		fprintf (contents, "%s\n",
			underline (capitalize (kv.first + " key bindings")).c_str ());
		map<action, string> agg;
		for (const auto &kv : *kv.second)
			agg[kv.second] += encode_key (kv.first) + " ";
		for (const auto &kv : agg) {
			auto action = g.action_names[kv.first];
			action.append (max (0, 20 - int (action.length ())), ' ');
			fprintf (contents, "%s %s\n", action.c_str (), kv.second.c_str ());
		}
		fprintf (contents, "\n");
	}
	run_pager (contents);
	fclose (contents);
}

/// Stays on the current match when there are no better ones, unless it's pushed
fun search (const wstring &needle, int push) -> int {
	int best = g.cursor, best_n = 0, matches = 0, step = push != 0 ? push : 1;
	for (int i = 0, count = g.entries.size (); i < count; i++) {
		int o = (g.cursor + (count + i * step) + (count + push)) % count;
		size_t n = prefix_length (to_wide (g.entries[o].filename), needle);
		matches += n == needle.size ();
		if (n > (size_t) best_n) {
			best = o;
			best_n = n;
		}
	}
	g.cursor = best;
	return matches;
}

fun search_interactive (int push) {
	int matches = search (g.editor_line, push);
	if (g.editor_line.empty ())
		g.editor_info.clear ();
	else if (matches == 0)
		g.editor_info = L"(no match)";
	else if (matches == 1)
		g.editor_info = L"(1 match)";
	else
		g.editor_info = L"(" + to_wstring (matches) + L" matches)";
}

fun fix_cursor_and_offset () {
	g.cursor = min (g.cursor, int (g.entries.size ()) - 1);
	g.cursor = max (g.cursor, 0);

	// Decrease the offset when more items can suddenly fit
	int pushable = visible_lines () - (int (g.entries.size ()) - g.offset);
	g.offset -= max (pushable, 0);

	// Make sure the cursor is visible
	g.offset = min (g.offset, int (g.entries.size ()) - 1);
	g.offset = max (g.offset, 0);

	if (g.offset > g.cursor)
		g.offset = g.cursor;
	if (g.cursor - g.offset >= visible_lines ())
		g.offset = g.cursor - visible_lines () + 1;
}

fun is_ancestor_dir (const string &ancestor, const string &of) -> bool {
	if (strncmp (ancestor.c_str (), of.c_str (), ancestor.length ()))
		return false;
	return of[ancestor.length ()] == '/' || (ancestor == "/" && ancestor != of);
}

/// If `path` is equal to the `current` directory, or lies underneath it,
/// return it as a relative path
fun relativize (string current, const string &path) -> string {
	if (current == path)
		return ".";
	if (current.back () != '/')
		current += '/';
	if (!strncmp (current.c_str (), path.c_str (), current.length ()))
		return path.substr (current.length ());
	return path;
}

fun pop_levels (const string& old_cwd) {
	string anchor; auto i = g.levels.rbegin ();
	while (i != g.levels.rend () && !is_ancestor_dir (i->path, g.cwd)) {
		if (i->path == g.cwd) {
			g.offset = i->offset;
			g.cursor = i->cursor;
			anchor = i->filename;
		}
		i++;
		g.levels.pop_back ();
	}

	// Don't pick up bullshit from foreign history entries, especially for /
	if (is_ancestor_dir (g.cwd, old_cwd)) {
		auto subpath = relativize (g.cwd, old_cwd);
		anchor = subpath.substr (0, subpath.find ('/'));
	}

	fix_cursor_and_offset ();
	if (!anchor.empty () && at_cursor ().filename != anchor)
		search (to_wide (anchor), 0);
}

fun explode_path (const string &path, vector<string> &out) {
	size_t mark = 0, p = path.find ("/");
	for (; p != string::npos; p = path.find ("/", (mark = p + 1)))
		out.push_back (path.substr (mark, p - mark));
	if (mark < path.length ())
		out.push_back (path.substr (mark));
}

fun serialize_path (const vector<string> &components) -> string {
	string result;
	for (const auto &i : components)
		result.append (i).append ("/");

	auto n = result.find_last_not_of ('/');
	if (n != result.npos)
		return result.erase (n + 1);
	return result;
}

fun absolutize (const string &abs_base, const string &path) -> string {
	if (path[0] == '/')
		return path;
	if (!abs_base.empty () && abs_base.back () == '/')
		return abs_base + path;
	return abs_base + "/" + path;
}

// Roughly follows the POSIX description of `cd -L` because of symlinks.
// HOME and CDPATH handling is ommitted.
fun change_dir (const string &path) {
	if (g.cwd[0] != '/') {
		show_message ("cannot figure out absolute path");
		beep ();
		return;
	}

	vector<string> in, out;
	explode_path (absolutize (g.cwd, path), in);

	// Paths with exactly two leading slashes may get special treatment
	size_t startempty = 1;
	if (in.size () >= 2 && in[1] == "" && (in.size () < 3 || in[2] != ""))
		startempty = 2;

	struct stat s{};
	for (size_t i = 0; i < in.size (); i++)
		if (in[i] == "..") {
			auto parent = relativize (g.cwd, serialize_path (out));
			if (errno = 0, !stat (parent.c_str (), &s) && !S_ISDIR (s.st_mode))
				errno = ENOTDIR;
			if (errno) {
				show_message (parent + ": " + strerror (errno));
				beep ();
				return;
			}
			if (!out.back().empty ())
				out.pop_back ();
		} else if (in[i] != "." && (!in[i].empty () || i < startempty)) {
			out.push_back (in[i]);
		}

	auto full_path = serialize_path (out);
	if (chdir (relativize (g.cwd, full_path).c_str ())) {
		show_message (strerror (errno));
		beep ();
		return;
	}

	level last {g.offset, g.cursor, g.cwd, at_cursor ().filename};
	g.cwd = full_path;
	bool same_path = last.path == g.cwd;
	reload (same_path);

	if (!same_path) {
		g.offset = g.cursor = 0;
		if (is_ancestor_dir (last.path, g.cwd))
			g.levels.push_back (last);
		else
			pop_levels (last.path);
	}
}

// Roughly follows the POSIX description of the PWD environment variable
fun initial_cwd () -> string {
	char cwd[4096] = ""; const char *pwd = getenv ("PWD");
	if (!getcwd (cwd, sizeof cwd)) {
		show_message (strerror (errno));
		return pwd;
	}
	if (!pwd || pwd[0] != '/' || strlen (pwd) >= PATH_MAX)
		return cwd;

	// Extra slashes shouldn't break anything for us
	vector<string> components;
	explode_path (pwd, components);
	for (const auto &i : components) {
		if (i == "." || i == "..")
			return cwd;
	}

	// Check if it "is an absolute pathname of the current working directory."
	// This particular method won't match on bind mounts, which is desired.
	char *real = realpath (pwd, nullptr);
	bool ok = real && !strcmp (cwd, real);
	free (real);
	return ok ? pwd : cwd;
}

fun choose (const entry &entry) {
	// Dive into directories and accessible symlinks to them
	if (!S_ISDIR (entry.info.st_mode)
	 && !S_ISDIR (entry.target_info.st_mode)) {
		g.chosen = entry.filename;
		g.quitting = true;
	} else {
		change_dir (entry.filename);
	}
}

// Move the cursor in `diff` direction and look for non-combining characters
fun move_towards_spacing (int diff) -> bool {
	g.editor_cursor += diff;
	return g.editor_cursor <= 0
		|| g.editor_cursor >= int (g.editor_line.length ())
		|| wcwidth (g.editor_line.at (g.editor_cursor));
}

fun handle_editor (wint_t c) {
	auto action = ACTION_NONE;
	if (g.editor_inserting) {
		(void) halfdelay (1);
		g.editor_inserting = false;
	} else {
		auto i = g_input_actions.find (c);
		if (i != g_input_actions.end ())
			action = i->second;

		auto m = g_binding_contexts.find (to_mb (g.editor));
		if (m != g_binding_contexts.end ()
		 && (i = m->second->find (c)) != m->second->end ())
			action = i->second;
	}

	auto original = g.editor_line;
	switch (action) {
	case ACTION_INPUT_CONFIRM:
		if (g.editor_on_confirm)
			g.editor_on_confirm ();
		// Fall-through
	case ACTION_INPUT_ABORT:
		g.editor = 0;
		g.editor_info.clear ();
		g.editor_line.clear ();
		g.editor_cursor = 0;
		g.editor_inserting = false;
		g.editor_on_change = nullptr;
		g.editor_on_confirm = nullptr;
		g.editor_on.clear ();
		return;
	case ACTION_INPUT_BEGINNING:
		g.editor_cursor = 0;
		break;
	case ACTION_INPUT_END:
		g.editor_cursor = g.editor_line.length ();
		break;
	case ACTION_INPUT_BACKWARD:
		while (g.editor_cursor > 0
			&& !move_towards_spacing (-1))
			;
		break;
	case ACTION_INPUT_FORWARD:
		while (g.editor_cursor < int (g.editor_line.length ())
			&& !move_towards_spacing (+1))
			;
		break;
	case ACTION_INPUT_B_DELETE:
		while (g.editor_cursor > 0) {
			auto finished = move_towards_spacing (-1);
			g.editor_line.erase (g.editor_cursor, 1);
			if (finished)
				break;
		}
		break;
	case ACTION_INPUT_DELETE:
		while (g.editor_cursor < int (g.editor_line.length ())) {
			g.editor_line.erase (g.editor_cursor, 1);
			if (move_towards_spacing (0))
				break;
		}
		break;
	case ACTION_INPUT_B_KILL_LINE:
		g.editor_line.erase (0, g.editor_cursor);
		g.editor_cursor = 0;
		break;
	case ACTION_INPUT_KILL_LINE:
		g.editor_line.erase (g.editor_cursor);
		break;
	case ACTION_INPUT_QUOTED_INSERT:
		(void) raw ();
		g.editor_inserting = true;
		break;
	default:
		if (auto handler = g.editor_on[action]) {
			handler ();
		} else if (c & (ALT | SYM)) {
			beep ();
		} else {
			g.editor_line.insert (g.editor_cursor, 1, c);
			g.editor_cursor++;
		}
	}
	if (g.editor_on_change && g.editor_line != original)
		g.editor_on_change ();
}

fun handle (wint_t c) -> bool {
	if (c == WEOF)
		return false;

	// If an editor is active, let it handle the key instead and eat it
	if (g.editor) {
		handle_editor (c);
		c = WEOF;
	}

	const auto &current = at_cursor ();
	bool is_directory =
		S_ISDIR (current.info.st_mode) ||
		S_ISDIR (current.target_info.st_mode);

	auto i = g_normal_actions.find (c);
	switch (i == g_normal_actions.end () ? ACTION_NONE : i->second) {
	case ACTION_CHOOSE_FULL:
		// FIXME: in the root directory, this inserts //item
		g.chosen = g.cwd + "/" + current.filename;
		g.no_chdir = true;
		g.quitting = true;
		break;
	case ACTION_CHOOSE:
		choose (current);
		break;
	case ACTION_VIEW:
		// Mimic mc, it does not seem sensible to page directories
		(is_directory ? change_dir : view) (current.filename);
		break;
	case ACTION_EDIT:
		edit (current.filename);
		break;
	case ACTION_HELP:
		show_help ();
		break;
	case ACTION_QUIT_NO_CHDIR:
		g.no_chdir = true;
		// Fall-through
	case ACTION_QUIT:
		g.quitting = true;
		break;

	case ACTION_SORT_LEFT:
		g.sort_column = (g.sort_column + entry::COLUMNS - 1) % entry::COLUMNS;
		g.sort_flash_ttl = 2;
		resort ();
		break;
	case ACTION_SORT_RIGHT:
		g.sort_column = (g.sort_column + entry::COLUMNS + 1) % entry::COLUMNS;
		g.sort_flash_ttl = 2;
		resort ();
		break;

	case ACTION_UP:
		g.cursor--;
		break;
	case ACTION_DOWN:
		g.cursor++;
		break;
	case ACTION_TOP:
		g.cursor = 0;
		break;
	case ACTION_BOTTOM:
		g.cursor = int (g.entries.size ()) - 1;
		break;

	case ACTION_HIGH:
		g.cursor = g.offset;
		break;
	case ACTION_MIDDLE:
		g.cursor = g.offset + (min (int (g.entries.size ()) - g.offset,
			visible_lines ()) - 1) / 2;
		break;
	case ACTION_LOW:
		g.cursor = g.offset + visible_lines () - 1;
		break;

	case ACTION_PAGE_PREVIOUS:
		g.cursor -= LINES;
		break;
	case ACTION_PAGE_NEXT:
		g.cursor += LINES;
		break;
	case ACTION_SCROLL_DOWN:
		g.offset++;
		break;
	case ACTION_SCROLL_UP:
		g.offset--;
		break;

	case ACTION_CHDIR:
		g.editor = L"chdir";
		g.editor_on_confirm = [] {
			change_dir (untilde (to_mb (g.editor_line)));
		};
		break;
	case ACTION_PARENT:
		change_dir ("..");
		break;
	case ACTION_GO_START:
		change_dir (g.start_dir);
		break;
	case ACTION_GO_HOME:
		change_dir (untilde ("~"));
		break;

	case ACTION_SEARCH:
		g.editor = L"search";
		g.editor_on_change       = [] { search_interactive (0); };
		g.editor_on[ACTION_UP]   = [] { search_interactive (-1); };
		g.editor_on[ACTION_DOWN] = [] { search_interactive (+1); };
		g.editor_on_confirm      = [] { choose (at_cursor ()); };
		break;
	case ACTION_RENAME_PREFILL:
		g.editor_line = to_wide (current.filename);
		g.editor_cursor = g.editor_line.length ();
		// Fall-through
	case ACTION_RENAME:
		g.editor = L"rename";
		g.editor_on_confirm = [] {
			auto mb = to_mb (g.editor_line);
			if (rename (at_cursor ().filename.c_str (), mb.c_str ()))
				show_message (strerror (errno));
			reload (true);
		};
		break;
	case ACTION_MKDIR:
		g.editor = L"mkdir";
		g.editor_on_confirm = [] {
			if (mkdir (to_mb (g.editor_line).c_str (), 0777))
				show_message (strerror (errno));
			reload (true);
		};
		break;

	case ACTION_TOGGLE_FULL:
		g.full_view = !g.full_view;
		break;
	case ACTION_REVERSE_SORT:
		g.reverse_sort = !g.reverse_sort;
		resort ();
		break;
	case ACTION_SHOW_HIDDEN:
		g.show_hidden = !g.show_hidden;
		reload (true);
		break;
	case ACTION_REDRAW:
		clear ();
		break;
	case ACTION_RELOAD:
		reload (true);
		break;
	default:
		if (c != KEY (RESIZE) && c != WEOF)
			beep ();
	}
	fix_cursor_and_offset ();
	update ();
	return !g.quitting;
}

fun inotify_check () {
	// Only provide simple indication that contents might have changed
	char buf[4096]; ssize_t len;
	bool changed = false;
	while ((len = read (g.inotify_fd, buf, sizeof buf)) > 0) {
		const inotify_event *e;
		for (char *ptr = buf; ptr < buf + len; ptr += sizeof *e + e->len) {
			e = (const inotify_event *) buf;
			if (e->wd == g.inotify_wd)
				changed = g.out_of_date = true;
		}
	}
	if (changed)
		update ();
}

fun load_cmdline (int argc, char *argv[]) {
	if (argc < 3)
		return;

	wstring line = to_wide (argv[1]); int cursor = atoi (argv[2]);
	if (line.empty () || cursor < 0 || cursor > (int) line.length ())
		return;

	std::replace_if (begin (line), end (line), iswspace, L' ');
	g.cmdline = apply_attrs (line += L' ', g.attrs[g.AT_CMDLINE]);
	// It is tempting to touch the cchar_t directly, though let's rather not
	g.cmdline[cursor] = cchar (g.attrs[g.AT_CMDLINE] ^ A_REVERSE, line[cursor]);
}

fun decode_ansi_sgr (const vector<string> &v) -> chtype {
	vector<int> args;
	for (const auto &arg : v) {
		char *end; unsigned long ul = strtoul (arg.c_str (), &end, 10);
		if (*end != '\0' || ul > 255)
			return 0;
		args.push_back (ul);
	}
	chtype result = 0; int fg = -1, bg = -1;
	for (size_t i = 0; i < args.size (); i++) {
		auto arg = args[i];
		if (arg == 0) {
			result = 0; fg = -1; bg = -1;
		} else if (arg == 1) {
			result |= A_BOLD;
		} else if (arg == 4) {
			result |= A_UNDERLINE;
		} else if (arg == 5) {
			result |= A_BLINK;
		} else if (arg == 7) {
			result |= A_REVERSE;
		} else if (arg >= 30 && arg <= 37) {
			fg = arg - 30;
		} else if (arg >= 40 && arg <= 47) {
			bg = arg - 40;
		// Anything other than indexed colours will be rejected completely
		} else if (arg == 38 && (i += 2) < args.size ()) {
			if (args[i - 1] != 5 || (fg = args[i]) >= COLORS)
				return 0;
		} else if (arg == 48 && (i += 2) < args.size ()) {
			if (args[i - 1] != 5 || (bg = args[i]) >= COLORS)
				return 0;
		}
	}
	if (fg != -1 || bg != -1)
		result |= COLOR_PAIR (allocate_pair (fg, bg));
	return result;
}

fun load_ls_colors (vector<string> colors) {
	map<string, chtype> attrs;
	for (const auto &pair : colors) {
		auto equal = pair.find ('=');
		if (equal == string::npos)
			continue;
		auto key = pair.substr (0, equal), value = pair.substr (equal + 1);
		if (key != g_ls_colors[LS_SYMLINK]
		 || !(g.ls_symlink_as_target = value == "target"))
			attrs[key] = decode_ansi_sgr (split (value, ";"));
	}
	for (int i = 0; i < LS_COUNT; i++) {
		auto m = attrs.find (g_ls_colors[i]);
		if (m != attrs.end ())
			g.ls_colors[i] = m->second;
	}
	for (const auto &pair : attrs) {
		if (pair.first.substr (0, 2) == "*.")
			g.ls_exts[pair.first.substr (2)] = pair.second;
	}
}

fun load_colors () {
	// Bail out on dumb terminals, there's not much one can do about them
	if (!has_colors () || start_color () == ERR || use_default_colors () == ERR)
		return;
	if (const char *colors = getenv ("LS_COLORS"))
		load_ls_colors (split (colors, ":"));

	auto config = xdg_config_find ("look");
	if (!config)
		return;

	vector<string> tokens;
	while (parse_line (*config, tokens)) {
		if (tokens.empty ())
			continue;
		auto name = shift (tokens);
		for (int i = 0; i < g.AT_COUNT; i++)
			if (name == g.attr_names[i])
				g.attrs[i] = decode_attrs (tokens);
	}
}

fun monotonic_ts_ms () -> int64_t {
	timespec ts{1, 0};  // A very specific fail-safe value
	(void) clock_gettime (CLOCK_MONOTONIC, &ts);
	return ts.tv_sec * 1e3 + ts.tv_nsec / 1e6;
}

fun read_key (wint_t &c) -> bool {
	// XXX: on at least some systems, when run over ssh in a bind handler,
	// after closing the terminal emulator we receive no fatal signal but our
	// parent shell gets reparented under init and our stdin gets closed,
	// so we'd keep getting ERR in an infinite loop, as that is what ncurses
	// automatically converts EOF into.  The most reasonable way to detect this
	// situation appears to be via timing.  Checking errno doesn't work and
	// resetting signal dispositions or the signal mask has no effect.
	auto start = monotonic_ts_ms ();
	int res = get_wch (&c);
	if (res == ERR) {
		c = WEOF;
		if (monotonic_ts_ms () - start >= 50)
			return false;
	}

	wint_t metafied{};
	if (c == 27 && (res = get_wch (&metafied)) != ERR)
		c = ALT | metafied;
	if (res == KEY_CODE_YES)
		c |= SYM;
	return true;
}

fun parse_key (const string &key_name) -> wint_t {
	wint_t c{};
	auto p = key_name.c_str ();
	if (!strncmp (p, "M-", 2)) {
		c |= ALT;
		p += 2;
	}
	if (g.name_to_key.count (p)) {
		return c | g.name_to_key.at (p);
	} else if (!strncmp (p, "C-", 2)) {
		p += 2;
		if (*p < '?' || *p > '~') {
			cerr << "bindings: invalid combination: " << key_name << endl;
			return WEOF;
		}
		c |= CTRL (*p);
		p += 1;
	} else {
		wchar_t w; mbstate_t mb {};
		auto len = strlen (p) + 1, res = mbrtowc (&w, p, len, &mb);
		if (res == 0) {
			cerr << "bindings: missing key name: " << key_name << endl;
			return WEOF;
		}
		if (res == size_t (-1) || res == size_t (-2)) {
			cerr << "bindings: invalid encoding: " << key_name << endl;
			return WEOF;
		}
		c |= w;
		p += res;
	}
	if (*p) {
		cerr << "key name has unparsable trailing part: " << key_name << endl;
		return WEOF;
	}
	return c;
}

fun learn_named_key (const string &name, wint_t key) {
	g.name_to_key[g.key_to_name[key] = name] = key;
}

fun load_bindings () {
	learn_named_key ("space", ' ');
	learn_named_key ("escape", 0x1b);

	int kc = 0;
	for (kc = KEY_MIN; kc <= KEY_MAX; kc++) {
		const char *name = keyname (kc);
		if (!name)
			continue;
		if (!strncmp (name, "KEY_", 4))
			name += 4;
		string filtered;
		for (; *name; name++) {
			if (*name != '(' && *name != ')')
				filtered += *name;
		}
		learn_named_key (filtered, SYM | kc);
	}

	// Stringization in the preprocessor is a bit limited, we want lisp-case
	map<string, action> actions;
	int a = 0;
	for (auto p : g_action_names) {
		string name;
		for (; *p; p++)
			name += *p == '_' ? '-' : *p + 'a' - 'A';
		g.action_names[a] = name;
		actions[name] = action (a++);
	}

	auto config = xdg_config_find ("bindings");
	if (!config)
		return;

	vector<string> tokens;
	while (parse_line (*config, tokens)) {
		if (tokens.empty ())
			continue;
		if (tokens.size () < 3) {
			cerr << "bindings: expected: define name key-sequence"
				" | context binding action";
			continue;
		}

		auto context = tokens[0], key_name = tokens[1], action = tokens[2];
		if (context == "define") {
			// We haven't run initscr() yet, so define_key() would fail here
			learn_named_key (key_name, SYM | (g.custom_keys[action] = ++kc));
			continue;
		}

		auto m = g_binding_contexts.find (context);
		if (m == g_binding_contexts.end ()) {
			cerr << "bindings: invalid context: " << context << endl;
			continue;
		}
		wint_t c = parse_key (key_name);
		if (c == WEOF)
			continue;
		auto i = actions.find (action);
		if (i == actions.end ()) {
			cerr << "bindings: invalid action: " << action << endl;
			continue;
		}
		(*m->second)[c] = i->second;
	}
}

fun load_history_level (const vector<string> &v) {
	if (v.size () != 7)
		return;
	// Not checking the hostname and parent PID right now since we can't merge
	g.levels.push_back ({stoi (v.at (4)), stoi (v.at (5)), v.at (3), v.at (6)});
}

fun load_config () {
	auto config = xdg_config_find ("config");
	if (!config)
		return;

	vector<string> tokens;
	while (parse_line (*config, tokens)) {
		if (tokens.empty ())
			continue;

		if      (tokens.front () == "full-view"    && tokens.size () > 1)
			g.full_view    = tokens.at (1) == "1";
		else if (tokens.front () == "gravity"      && tokens.size () > 1)
			g.gravity      = tokens.at (1) == "1";
		else if (tokens.front () == "reverse-sort" && tokens.size () > 1)
			g.reverse_sort = tokens.at (1) == "1";
		else if (tokens.front () == "show-hidden"  && tokens.size () > 1)
			g.show_hidden  = tokens.at (1) == "1";
		else if (tokens.front () == "ext-helpers"  && tokens.size () > 1)
			g.ext_helpers  = tokens.at (1) == "1";
		else if (tokens.front () == "sort-column"  && tokens.size () > 1)
			g.sort_column  = stoi (tokens.at (1));
		else if (tokens.front () == "history")
			load_history_level (tokens);
	}
}

fun save_config () {
	auto config = xdg_config_write ("config");
	if (!config)
		return;

	write_line (*config, {"full-view",    g.full_view    ? "1" : "0"});
	write_line (*config, {"gravity",      g.gravity      ? "1" : "0"});
	write_line (*config, {"reverse-sort", g.reverse_sort ? "1" : "0"});
	write_line (*config, {"show-hidden",  g.show_hidden  ? "1" : "0"});
	write_line (*config, {"ext-helpers",  g.ext_helpers  ? "1" : "0"});

	write_line (*config, {"sort-column",  to_string (g.sort_column)});

	char hostname[256];
	if (gethostname (hostname, sizeof hostname))
		*hostname = 0;

	auto ppid = std::to_string (getppid ());
	for (auto i = g.levels.begin (); i != g.levels.end (); i++)
		write_line (*config, {"history", hostname, ppid, i->path,
			to_string (i->offset), to_string (i->cursor), i->filename});
	write_line (*config, {"history", hostname, ppid, g.cwd,
		to_string (g.offset), to_string (g.cursor),
		at_cursor ().filename});
}

int main (int argc, char *argv[]) {
	if (argc == 2 && string (argv[1]) == "--version") {
		cout << PROJECT_NAME << " " << PROJECT_VERSION << endl;
		return 0;
	}

	// zsh before 5.4 may close stdin before exec without redirection,
	// since then it redirects stdin to /dev/null
	(void) close (STDIN_FILENO);
	if (open ("/dev/tty", O_RDWR)) {
		cerr << "cannot open tty" << endl;
		return 1;
	}

	// Save the original stdout and force ncurses to use the terminal directly
	auto output_fd = dup (STDOUT_FILENO);
	dup2 (STDIN_FILENO, STDOUT_FILENO);

	// So that the neither us nor our children stop on tcsetpgrp()
	signal (SIGTTOU, SIG_IGN);

	if ((g.inotify_fd = inotify_init1 (IN_NONBLOCK)) < 0) {
		cerr << "cannot initialize inotify" << endl;
		return 1;
	}

	locale::global (locale (""));
	load_bindings ();
	load_config ();

	if (!initscr () || cbreak () == ERR || noecho () == ERR || nonl () == ERR) {
		cerr << "cannot initialize screen" << endl;
		return 1;
	}
	for (const auto &definition_kc : g.custom_keys)
		define_key (definition_kc.first.c_str (), definition_kc.second);

	load_colors ();
	load_cmdline (argc, argv);
	g.start_dir = g.cwd = initial_cwd ();
	reload (false);
	pop_levels (g.cwd);
	update ();

	// Invoking keypad() earlier would make ncurses flush its output buffer,
	// which would worsen start-up flickering
	if (halfdelay (1) == ERR || keypad (stdscr, TRUE) == ERR) {
		endwin ();
		cerr << "cannot configure input" << endl;
		return 1;
	}

	wint_t c;
	while (!read_key (c) || handle (c)) {
		inotify_check ();
		if (g.sort_flash_ttl && !--g.sort_flash_ttl)
			update ();
		if (g.message_ttl && !--g.message_ttl) {
			g.message.clear ();
			update ();
		}
	}
	endwin ();
	save_config ();

	// Presumably it is going to end up as an argument, so quote it
	if (!g.chosen.empty ())
		g.chosen = shell_escape (g.chosen);

	// We can't portably create a standard stream from an FD, so modify the FD
	dup2 (output_fd, STDOUT_FILENO);

	// TODO: avoid printing any of this unless the SDN envvar is set
	if (g.cwd != g.start_dir && !g.no_chdir)
		cout << "local cd=" << shell_escape (g.cwd) << endl;
	else
		cout << "local cd=" << endl;

	cout << "local insert=" << shell_escape (g.chosen) << endl;
	cout << "local helper=" << shell_escape (g.ext_helper) << endl;
	return 0;
}