-
Notifications
You must be signed in to change notification settings - Fork 53
/
mtm.c
1177 lines (1055 loc) · 37.7 KB
/
mtm.c
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
/* Copyright 2017 - 2019 Rob King <[email protected]>
*
* 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 <http://www.gnu.org/licenses/>.
*/
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <locale.h>
#include <pwd.h>
#include <signal.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/select.h>
#include <sys/types.h>
#include <unistd.h>
#include <wchar.h>
#include <wctype.h>
#include "vtparser.h"
/*** CONFIGURATION */
#include "config.h"
#define MIN(x, y) ((x) < (y)? (x) : (y))
#define MAX(x, y) ((x) > (y)? (x) : (y))
#define CTL(x) ((x) & 0x1f)
#define USAGE "usage: mtm [-T NAME] [-t NAME] [-c KEY]\n"
/*** DATA TYPES */
typedef enum{
HORIZONTAL,
VERTICAL,
VIEW
} Node;
typedef struct SCRN SCRN;
struct SCRN{
int sy, sx, vis, tos, off;
short fg, bg, sfg, sbg, sp;
bool insert, oxenl, xenl, saved;
attr_t sattr;
WINDOW *win;
};
typedef struct NODE NODE;
struct NODE{
Node t;
int y, x, h, w, pt, ntabs;
bool *tabs, pnm, decom, am, lnm;
wchar_t repc;
NODE *p, *c1, *c2;
SCRN pri, alt, *s;
wchar_t *g0, *g1, *g2, *g3, *gc, *gs, *sgc, *sgs;
VTPARSER vp;
};
/*** GLOBALS AND PROTOTYPES */
static NODE *root, *focused, *lastfocused = NULL;
static int commandkey = CTL(COMMAND_KEY), nfds = 1; /* stdin */
static fd_set fds;
static char iobuf[BUFSIZ];
static void setupevents(NODE *n);
static void reshape(NODE *n, int y, int x, int h, int w);
static void draw(NODE *n);
static void reshapechildren(NODE *n);
static const char *term = NULL;
static void freenode(NODE *n, bool recursive);
void start_pairs(void);
short mtm_alloc_pair(int fg, int bg);
/*** UTILITY FUNCTIONS */
static void
quit(int rc, const char *m) /* Shut down MTM. */
{
if (m)
fprintf(stderr, "%s\n", m);
if (root)
freenode(root, true);
endwin();
exit(rc);
}
static void
safewrite(int fd, const char *b, size_t n) /* Write, checking for errors. */
{
size_t w = 0;
while (w < n){
ssize_t s = write(fd, b + w, n - w);
if (s < 0 && errno != EINTR)
return;
else if (s < 0)
s = 0;
w += (size_t)s;
}
}
static const char *
getshell(void) /* Get the user's preferred shell. */
{
if (getenv("SHELL"))
return getenv("SHELL");
struct passwd *pwd = getpwuid(getuid());
if (pwd)
return pwd->pw_shell;
return "/bin/sh";
}
/*** TERMINAL EMULATION HANDLERS
* These functions implement the various terminal commands activated by
* escape sequences and printing to the terminal. Large amounts of boilerplate
* code is shared among all these functions, and is factored out into the
* macros below:
* PD(n, d) - Parameter n, with default d.
* P0(n) - Parameter n, default 0.
* P1(n) - Parameter n, default 1.
* CALL(h) - Call handler h with no arguments.
* SENDN(n, s, c) - Write string c bytes of s to n.
* SEND(n, s) - Write string s to node n's host.
* (END)HANDLER - Declare/end a handler function
* COMMONVARS - All of the common variables for a handler.
* x, y - cursor position
* mx, my - max possible values for x and y
* px, py - physical cursor position in scrollback
* n - the current node
* win - the current window
* top, bot - the scrolling region
* tos - top of the screen in the pad
* s - the current SCRN buffer
* The funny names for handlers are from their ANSI/ECMA/DEC mnemonics.
*/
#define PD(x, d) (argc < (x) || !argv? (d) : argv[(x)])
#define P0(x) PD(x, 0)
#define P1(x) (!P0(x)? 1 : P0(x))
#define CALL(x) (x)(v, n, 0, 0, 0, NULL, NULL)
#define SENDN(n, s, c) safewrite(n->pt, s, c)
#define SEND(n, s) SENDN(n, s, strlen(s))
#define COMMONVARS \
NODE *n = (NODE *)p; \
SCRN *s = n->s; \
WINDOW *win = s->win; \
int py, px, y, x, my, mx, top = 0, bot = 0, tos = s->tos; \
(void)v; (void)p; (void)w; (void)iw; (void)argc; (void)argv; \
(void)win; (void)y; (void)x; (void)my; (void)mx; (void)osc; \
(void)tos; \
getyx(win, py, px); y = py - s->tos; x = px; \
getmaxyx(win, my, mx); my -= s->tos; \
wgetscrreg(win, &top, &bot); \
bot++; bot -= s->tos; \
top = top <= tos? 0 : top - tos; \
#define HANDLER(name) \
static void \
name (VTPARSER *v, void *p, wchar_t w, wchar_t iw, \
int argc, int *argv, const wchar_t *osc) \
{ COMMONVARS
#define ENDHANDLER n->repc = 0; } /* control sequences aren't repeated */
HANDLER(bell) /* Terminal bell. */
beep();
ENDHANDLER
HANDLER(numkp) /* Application/Numeric Keypad Mode */
n->pnm = (w == L'=');
ENDHANDLER
HANDLER(vis) /* Cursor visibility */
s->vis = iw == L'6'? 0 : 1;
ENDHANDLER
HANDLER(cup) /* CUP - Cursor Position */
s->xenl = false;
wmove(win, tos + (n->decom? top : 0) + P1(0) - 1, P1(1) - 1);
ENDHANDLER
HANDLER(dch) /* DCH - Delete Character */
for (int i = 0; i < P1(0); i++)
wdelch(win);
ENDHANDLER
HANDLER(ich) /* ICH - Insert Character */
for (int i = 0; i < P1(0); i++)
wins_nwstr(win, L" ", 1);
ENDHANDLER
HANDLER(cuu) /* CUU - Cursor Up */
wmove(win, MAX(py - P1(0), tos + top), x);
ENDHANDLER
HANDLER(cud) /* CUD - Cursor Down */
wmove(win, MIN(py + P1(0), tos + bot - 1), x);
ENDHANDLER
HANDLER(cuf) /* CUF - Cursor Forward */
wmove(win, py, MIN(x + P1(0), mx - 1));
ENDHANDLER
HANDLER(ack) /* ACK - Acknowledge Enquiry */
SEND(n, "\006");
ENDHANDLER
HANDLER(hts) /* HTS - Horizontal Tab Set */
if (x < n->ntabs && x > 0)
n->tabs[x] = true;
ENDHANDLER
HANDLER(ri) /* RI - Reverse Index */
int otop = 0, obot = 0;
wgetscrreg(win, &otop, &obot);
wsetscrreg(win, otop >= tos? otop : tos, obot);
y == top? wscrl(win, -1) : wmove(win, MAX(tos, py - 1), x);
wsetscrreg(win, otop, obot);
ENDHANDLER
HANDLER(decid) /* DECID - Send Terminal Identification */
if (w == L'c')
SEND(n, iw == L'>'? "\033[>1;10;0c" : "\033[?1;2c");
else if (w == L'Z')
SEND(n, "\033[?6c");
ENDHANDLER
HANDLER(hpa) /* HPA - Cursor Horizontal Absolute */
wmove(win, py, MIN(P1(0) - 1, mx - 1));
ENDHANDLER
HANDLER(hpr) /* HPR - Cursor Horizontal Relative */
wmove(win, py, MIN(px + P1(0), mx - 1));
ENDHANDLER
HANDLER(vpa) /* VPA - Cursor Vertical Absolute */
wmove(win, MIN(tos + bot - 1, MAX(tos + top, tos + P1(0) - 1)), x);
ENDHANDLER
HANDLER(vpr) /* VPR - Cursor Vertical Relative */
wmove(win, MIN(tos + bot - 1, MAX(tos + top, py + P1(0))), x);
ENDHANDLER
HANDLER(cbt) /* CBT - Cursor Backwards Tab */
for (int i = x - 1; i < n->ntabs && i >= 0; i--) if (n->tabs[i]){
wmove(win, py, i);
return;
}
wmove(win, py, 0);
ENDHANDLER
HANDLER(ht) /* HT - Horizontal Tab */
for (int i = x + 1; i < n->w && i < n->ntabs; i++) if (n->tabs[i]){
wmove(win, py, i);
return;
}
wmove(win, py, mx - 1);
ENDHANDLER
HANDLER(tab) /* Tab forwards or backwards */
for (int i = 0; i < P1(0); i++) switch (w){
case L'I': CALL(ht); break;
case L'\t': CALL(ht); break;
case L'Z': CALL(cbt); break;
}
ENDHANDLER
HANDLER(decaln) /* DECALN - Screen Alignment Test */
chtype e[] = {COLOR_PAIR(0) | 'E', 0};
for (int r = 0; r < my; r++){
for (int c = 0; c <= mx; c++)
mvwaddchnstr(win, tos + r, c, e, 1);
}
wmove(win, py, px);
ENDHANDLER
HANDLER(su) /* SU - Scroll Up/Down */
wscrl(win, (w == L'T' || w == L'^')? -P1(0) : P1(0));
ENDHANDLER
HANDLER(sc) /* SC - Save Cursor */
s->sx = px; /* save X position */
s->sy = py; /* save Y position */
wattr_get(win, &s->sattr, &s->sp, NULL); /* save attrs and color pair */
s->sfg = s->fg; /* save foreground color */
s->sbg = s->bg; /* save background color */
s->oxenl = s->xenl; /* save xenl state */
s->saved = true; /* save data is valid */
n->sgc = n->gc; n->sgs = n->gs; /* save character sets */
ENDHANDLER
HANDLER(rc) /* RC - Restore Cursor */
if (iw == L'#'){
CALL(decaln);
return;
}
if (!s->saved)
return;
wmove(win, s->sy, s->sx); /* get old position */
wattr_set(win, s->sattr, s->sp, NULL); /* get attrs and color pair */
s->fg = s->sfg; /* get foreground color */
s->bg = s->sbg; /* get background color */
s->xenl = s->oxenl; /* get xenl state */
n->gc = n->sgc; n->gs = n->sgs; /* save character sets */
/* restore colors */
int cp = mtm_alloc_pair(s->fg, s->bg);
wcolor_set(win, cp, NULL);
cchar_t c;
setcchar(&c, L" ", A_NORMAL, cp, NULL);
wbkgrndset(win, &c);
ENDHANDLER
HANDLER(tbc) /* TBC - Tabulation Clear */
switch (P0(0)){
case 0: n->tabs[x < n->ntabs? x : 0] = false; break;
case 3: memset(n->tabs, 0, sizeof(bool) * (n->ntabs)); break;
}
ENDHANDLER
HANDLER(cub) /* CUB - Cursor Backward */
s->xenl = false;
wmove(win, py, MAX(x - P1(0), 0));
ENDHANDLER
HANDLER(el) /* EL - Erase in Line */
cchar_t b;
setcchar(&b, L" ", A_NORMAL, mtm_alloc_pair(s->fg, s->bg), NULL);
switch (P0(0)){
case 0: wclrtoeol(win); break;
case 1: for (int i = 0; i <= x; i++) mvwadd_wchnstr(win, py, i, &b, 1); break;
case 2: wmove(win, py, 0); wclrtoeol(win); break;
}
wmove(win, py, x);
ENDHANDLER
HANDLER(ed) /* ED - Erase in Display */
int o = 1;
switch (P0(0)){
case 0: wclrtobot(win); break;
case 3: werase(win); break;
case 2: wmove(win, tos, 0); wclrtobot(win); break;
case 1:
for (int i = tos; i < py; i++){
wmove(win, i, 0);
wclrtoeol(win);
}
wmove(win, py, x);
el(v, p, w, iw, 1, &o, NULL);
break;
}
wmove(win, py, px);
ENDHANDLER
HANDLER(ech) /* ECH - Erase Character */
cchar_t c;
setcchar(&c, L" ", A_NORMAL, mtm_alloc_pair(s->fg, s->bg), NULL);
for (int i = 0; i < P1(0); i++)
mvwadd_wchnstr(win, py, x + i, &c, 1);
wmove(win, py, px);
ENDHANDLER
HANDLER(dsr) /* DSR - Device Status Report */
char buf[100] = {0};
if (P0(0) == 6)
snprintf(buf, sizeof(buf) - 1, "\033[%d;%dR",
(n->decom? y - top : y) + 1, x + 1);
else
snprintf(buf, sizeof(buf) - 1, "\033[0n");
SEND(n, buf);
ENDHANDLER
HANDLER(idl) /* IL or DL - Insert/Delete Line */
/* we don't use insdelln here because it inserts above and not below,
* and has a few other edge cases... */
int otop = 0, obot = 0, p1 = MIN(P1(0), (my - 1) - y);
wgetscrreg(win, &otop, &obot);
wsetscrreg(win, py, obot);
wscrl(win, w == L'L'? -p1 : p1);
wsetscrreg(win, otop, obot);
wmove(win, py, 0);
ENDHANDLER
HANDLER(csr) /* CSR - Change Scrolling Region */
if (wsetscrreg(win, tos + P1(0) - 1, tos + PD(1, my) - 1) == OK)
CALL(cup);
ENDHANDLER
HANDLER(decreqtparm) /* DECREQTPARM - Request Device Parameters */
SEND(n, P0(0)? "\033[3;1;2;120;1;0x" : "\033[2;1;2;120;128;1;0x");
ENDHANDLER
HANDLER(sgr0) /* Reset SGR to default */
wattrset(win, A_NORMAL);
wcolor_set(win, 0, NULL);
s->fg = s->bg = -1;
wbkgdset(win, COLOR_PAIR(0) | ' ');
ENDHANDLER
HANDLER(cls) /* Clear screen */
CALL(cup);
wclrtobot(win);
CALL(cup);
ENDHANDLER
HANDLER(ris) /* RIS - Reset to Initial State */
n->gs = n->gc = n->g0 = CSET_US; n->g1 = CSET_GRAPH;
n->g2 = CSET_US; n->g3 = CSET_GRAPH;
n->decom = s->insert = s->oxenl = s->xenl = n->lnm = false;
CALL(cls);
CALL(sgr0);
n->am = true;
n->pnm = false;
n->pri.vis = n->alt.vis = 1;
n->s = &n->pri;
wsetscrreg(n->pri.win, 0, MAX(SCROLLBACK, n->h) - 1);
wsetscrreg(n->alt.win, 0, n->h - 1);
for (int i = 0; i < n->ntabs; i++)
n->tabs[i] = (i % 8 == 0);
ENDHANDLER
HANDLER(mode) /* Set or Reset Mode */
bool set = (w == L'h');
for (int i = 0; i < argc; i++) switch (P0(i)){
case 1: n->pnm = set; break;
case 3: CALL(cls); break;
case 4: s->insert = set; break;
case 6: n->decom = set; CALL(cup); break;
case 7: n->am = set; break;
case 20: n->lnm = set; break;
case 25: s->vis = set? 1 : 0; break;
case 34: s->vis = set? 1 : 2; break;
case 1048: CALL((set? sc : rc)); break;
case 1049:
CALL((set? sc : rc)); /* fall-through */
case 47: case 1047: if (set && n->s != &n->alt){
n->s = &n->alt;
CALL(cls);
} else if (!set && n->s != &n->pri)
n->s = &n->pri;
break;
}
ENDHANDLER
HANDLER(sgr) /* SGR - Select Graphic Rendition */
bool doc = false, do8 = COLORS >= 8, do16 = COLORS >= 16, do256 = COLORS >= 256;
if (!argc)
CALL(sgr0);
short bg = s->bg, fg = s->fg;
for (int i = 0; i < argc; i++) switch (P0(i)){
case 0: CALL(sgr0); break;
case 1: wattron(win, A_BOLD); break;
case 2: wattron(win, A_DIM); break;
case 4: wattron(win, A_UNDERLINE); break;
case 5: wattron(win, A_BLINK); break;
case 7: wattron(win, A_REVERSE); break;
case 8: wattron(win, A_INVIS); break;
case 22: wattroff(win, A_DIM); wattroff(win, A_BOLD); break;
case 24: wattroff(win, A_UNDERLINE); break;
case 25: wattroff(win, A_BLINK); break;
case 27: wattroff(win, A_REVERSE); break;
case 30: fg = COLOR_BLACK; doc = do8; break;
case 31: fg = COLOR_RED; doc = do8; break;
case 32: fg = COLOR_GREEN; doc = do8; break;
case 33: fg = COLOR_YELLOW; doc = do8; break;
case 34: fg = COLOR_BLUE; doc = do8; break;
case 35: fg = COLOR_MAGENTA; doc = do8; break;
case 36: fg = COLOR_CYAN; doc = do8; break;
case 37: fg = COLOR_WHITE; doc = do8; break;
case 38: fg = P0(i+1) == 5? P0(i+2) : s->fg; i += 2; doc = do256; break;
case 39: fg = -1; doc = true; break;
case 40: bg = COLOR_BLACK; doc = do8; break;
case 41: bg = COLOR_RED; doc = do8; break;
case 42: bg = COLOR_GREEN; doc = do8; break;
case 43: bg = COLOR_YELLOW; doc = do8; break;
case 44: bg = COLOR_BLUE; doc = do8; break;
case 45: bg = COLOR_MAGENTA; doc = do8; break;
case 46: bg = COLOR_CYAN; doc = do8; break;
case 47: bg = COLOR_WHITE; doc = do8; break;
case 48: bg = P0(i+1) == 5? P0(i+2) : s->bg; i += 2; doc = do256; break;
case 49: bg = -1; doc = true; break;
case 90: fg = COLOR_BLACK; doc = do16; break;
case 91: fg = COLOR_RED; doc = do16; break;
case 92: fg = COLOR_GREEN; doc = do16; break;
case 93: fg = COLOR_YELLOW; doc = do16; break;
case 94: fg = COLOR_BLUE; doc = do16; break;
case 95: fg = COLOR_MAGENTA; doc = do16; break;
case 96: fg = COLOR_CYAN; doc = do16; break;
case 97: fg = COLOR_WHITE; doc = do16; break;
case 100: bg = COLOR_BLACK; doc = do16; break;
case 101: bg = COLOR_RED; doc = do16; break;
case 102: bg = COLOR_GREEN; doc = do16; break;
case 103: bg = COLOR_YELLOW; doc = do16; break;
case 104: bg = COLOR_BLUE; doc = do16; break;
case 105: bg = COLOR_MAGENTA; doc = do16; break;
case 106: bg = COLOR_CYAN; doc = do16; break;
case 107: bg = COLOR_WHITE; doc = do16; break;
#if defined(A_ITALIC) && !defined(NO_ITALICS) && !defined(REVERSE_ITALICS)
case 3: wattron(win, A_ITALIC); break;
case 23: wattroff(win, A_ITALIC); break;
#endif
#if defined(REVERSE_ITALICS)
case 3: wattron(win, A_REVERSE); break;
case 23: wattroff(win, A_REVERSE); break;
#endif
}
if (doc){
int p = mtm_alloc_pair(s->fg = fg, s->bg = bg);
wcolor_set(win, p, NULL);
cchar_t c;
setcchar(&c, L" ", A_NORMAL, p, NULL);
wbkgrndset(win, &c);
}
}
HANDLER(cr) /* CR - Carriage Return */
s->xenl = false;
wmove(win, py, 0);
ENDHANDLER
HANDLER(ind) /* IND - Index */
y == (bot - 1)? scroll(win) : wmove(win, py + 1, x);
ENDHANDLER
HANDLER(nel) /* NEL - Next Line */
CALL(cr); CALL(ind);
ENDHANDLER
HANDLER(pnl) /* NL - Newline */
CALL((n->lnm? nel : ind));
ENDHANDLER
HANDLER(cpl) /* CPL - Cursor Previous Line */
wmove(win, MAX(tos + top, py - P1(0)), 0);
ENDHANDLER
HANDLER(cnl) /* CNL - Cursor Next Line */
wmove(win, MIN(tos + bot - 1, py + P1(0)), 0);
ENDHANDLER
HANDLER(print) /* Print a character to the terminal */
if (wcwidth(w) < 0)
return;
if (s->insert)
CALL(ich);
if (s->xenl){
s->xenl = false;
if (n->am)
CALL(nel);
getyx(win, y, x);
y -= tos;
}
if (w < MAXMAP && n->gc[w])
w = n->gc[w];
n->repc = w;
if (x == mx - wcwidth(w)){
s->xenl = true;
wins_nwstr(win, &w, 1);
} else
waddnwstr(win, &w, 1);
n->gc = n->gs;
} /* no ENDHANDLER because we don't want to reset repc */
HANDLER(rep) /* REP - Repeat Character */
for (int i = 0; i < P1(0) && n->repc; i++)
print(v, p, n->repc, 0, 0, NULL, NULL);
ENDHANDLER
HANDLER(scs) /* Select Character Set */
wchar_t **t = NULL;
switch (iw){
case L'(': t = &n->g0; break;
case L')': t = &n->g1; break;
case L'*': t = &n->g2; break;
case L'+': t = &n->g3; break;
default: return; break;
}
switch (w){
case L'A': *t = CSET_UK; break;
case L'B': *t = CSET_US; break;
case L'0': *t = CSET_GRAPH; break;
case L'1': *t = CSET_US; break;
case L'2': *t = CSET_GRAPH; break;
}
ENDHANDLER
HANDLER(so) /* Switch Out/In Character Set */
if (w == 0x0e)
n->gs = n->gc = n->g1; /* locking shift */
else if (w == 0xf)
n->gs = n->gc = n->g0; /* locking shift */
else if (w == L'n')
n->gs = n->gc = n->g2; /* locking shift */
else if (w == L'o')
n->gs = n->gc = n->g3; /* locking shift */
else if (w == L'N'){
n->gs = n->gc; /* non-locking shift */
n->gc = n->g2;
} else if (w == L'O'){
n->gs = n->gc; /* non-locking shift */
n->gc = n->g3;
}
ENDHANDLER
static void
setupevents(NODE *n)
{
n->vp.p = n;
vtonevent(&n->vp, VTPARSER_CONTROL, 0x05, ack);
vtonevent(&n->vp, VTPARSER_CONTROL, 0x07, bell);
vtonevent(&n->vp, VTPARSER_CONTROL, 0x08, cub);
vtonevent(&n->vp, VTPARSER_CONTROL, 0x09, tab);
vtonevent(&n->vp, VTPARSER_CONTROL, 0x0a, pnl);
vtonevent(&n->vp, VTPARSER_CONTROL, 0x0b, pnl);
vtonevent(&n->vp, VTPARSER_CONTROL, 0x0c, pnl);
vtonevent(&n->vp, VTPARSER_CONTROL, 0x0d, cr);
vtonevent(&n->vp, VTPARSER_CONTROL, 0x0e, so);
vtonevent(&n->vp, VTPARSER_CONTROL, 0x0f, so);
vtonevent(&n->vp, VTPARSER_CSI, L'A', cuu);
vtonevent(&n->vp, VTPARSER_CSI, L'B', cud);
vtonevent(&n->vp, VTPARSER_CSI, L'C', cuf);
vtonevent(&n->vp, VTPARSER_CSI, L'D', cub);
vtonevent(&n->vp, VTPARSER_CSI, L'E', cnl);
vtonevent(&n->vp, VTPARSER_CSI, L'F', cpl);
vtonevent(&n->vp, VTPARSER_CSI, L'G', hpa);
vtonevent(&n->vp, VTPARSER_CSI, L'H', cup);
vtonevent(&n->vp, VTPARSER_CSI, L'I', tab);
vtonevent(&n->vp, VTPARSER_CSI, L'J', ed);
vtonevent(&n->vp, VTPARSER_CSI, L'K', el);
vtonevent(&n->vp, VTPARSER_CSI, L'L', idl);
vtonevent(&n->vp, VTPARSER_CSI, L'M', idl);
vtonevent(&n->vp, VTPARSER_CSI, L'P', dch);
vtonevent(&n->vp, VTPARSER_CSI, L'S', su);
vtonevent(&n->vp, VTPARSER_CSI, L'T', su);
vtonevent(&n->vp, VTPARSER_CSI, L'X', ech);
vtonevent(&n->vp, VTPARSER_CSI, L'Z', tab);
vtonevent(&n->vp, VTPARSER_CSI, L'`', hpa);
vtonevent(&n->vp, VTPARSER_CSI, L'^', su);
vtonevent(&n->vp, VTPARSER_CSI, L'@', ich);
vtonevent(&n->vp, VTPARSER_CSI, L'a', hpr);
vtonevent(&n->vp, VTPARSER_CSI, L'b', rep);
vtonevent(&n->vp, VTPARSER_CSI, L'c', decid);
vtonevent(&n->vp, VTPARSER_CSI, L'd', vpa);
vtonevent(&n->vp, VTPARSER_CSI, L'e', vpr);
vtonevent(&n->vp, VTPARSER_CSI, L'f', cup);
vtonevent(&n->vp, VTPARSER_CSI, L'g', tbc);
vtonevent(&n->vp, VTPARSER_CSI, L'h', mode);
vtonevent(&n->vp, VTPARSER_CSI, L'l', mode);
vtonevent(&n->vp, VTPARSER_CSI, L'm', sgr);
vtonevent(&n->vp, VTPARSER_CSI, L'n', dsr);
vtonevent(&n->vp, VTPARSER_CSI, L'r', csr);
vtonevent(&n->vp, VTPARSER_CSI, L's', sc);
vtonevent(&n->vp, VTPARSER_CSI, L'u', rc);
vtonevent(&n->vp, VTPARSER_CSI, L'x', decreqtparm);
vtonevent(&n->vp, VTPARSER_ESCAPE, L'0', scs);
vtonevent(&n->vp, VTPARSER_ESCAPE, L'1', scs);
vtonevent(&n->vp, VTPARSER_ESCAPE, L'2', scs);
vtonevent(&n->vp, VTPARSER_ESCAPE, L'7', sc);
vtonevent(&n->vp, VTPARSER_ESCAPE, L'8', rc);
vtonevent(&n->vp, VTPARSER_ESCAPE, L'A', scs);
vtonevent(&n->vp, VTPARSER_ESCAPE, L'B', scs);
vtonevent(&n->vp, VTPARSER_ESCAPE, L'D', ind);
vtonevent(&n->vp, VTPARSER_ESCAPE, L'E', nel);
vtonevent(&n->vp, VTPARSER_ESCAPE, L'H', hts);
vtonevent(&n->vp, VTPARSER_ESCAPE, L'M', ri);
vtonevent(&n->vp, VTPARSER_ESCAPE, L'Z', decid);
vtonevent(&n->vp, VTPARSER_ESCAPE, L'c', ris);
vtonevent(&n->vp, VTPARSER_ESCAPE, L'p', vis);
vtonevent(&n->vp, VTPARSER_ESCAPE, L'=', numkp);
vtonevent(&n->vp, VTPARSER_ESCAPE, L'>', numkp);
vtonevent(&n->vp, VTPARSER_PRINT, 0, print);
}
/*** MTM FUNCTIONS
* These functions do the user-visible work of MTM: creating nodes in the
* tree, updating the display, and so on.
*/
static bool *
newtabs(int w, int ow, bool *oldtabs) /* Initialize default tabstops. */
{
bool *tabs = calloc(w, sizeof(bool));
if (!tabs)
return NULL;
for (int i = 0; i < w; i++) /* keep old overlapping tabs */
tabs[i] = i < ow? oldtabs[i] : (i % 8 == 0);
return tabs;
}
static NODE *
newnode(Node t, NODE *p, int y, int x, int h, int w) /* Create a new node. */
{
NODE *n = calloc(1, sizeof(NODE));
bool *tabs = newtabs(w, 0, NULL);
if (!n || h < 2 || w < 2 || !tabs)
return free(n), free(tabs), NULL;
n->t = t;
n->pt = -1;
n->p = p;
n->y = y;
n->x = x;
n->h = h;
n->w = w;
n->tabs = tabs;
n->ntabs = w;
return n;
}
static void
freenode(NODE *n, bool recurse) /* Free a node. */
{
if (n){
if (lastfocused == n)
lastfocused = NULL;
if (n->pri.win)
delwin(n->pri.win);
if (n->alt.win)
delwin(n->alt.win);
if (recurse)
freenode(n->c1, true);
if (recurse)
freenode(n->c2, true);
if (n->pt >= 0){
close(n->pt);
FD_CLR(n->pt, &fds);
}
free(n->tabs);
free(n);
}
}
static void
fixcursor(void) /* Move the terminal cursor to the active view. */
{
if (focused){
int y, x;
curs_set(focused->s->off != focused->s->tos? 0 : focused->s->vis);
getyx(focused->s->win, y, x);
y = MIN(MAX(y, focused->s->tos), focused->s->tos + focused->h - 1);
wmove(focused->s->win, y, x);
}
}
static const char *
getterm(void)
{
const char *envterm = getenv("TERM");
if (term)
return term;
if (envterm && COLORS >= 256 && !strstr(DEFAULT_TERMINAL, "-256color"))
return DEFAULT_256_COLOR_TERMINAL;
return DEFAULT_TERMINAL;
}
static NODE *
newview(NODE *p, int y, int x, int h, int w) /* Open a new view. */
{
struct winsize ws = {.ws_row = h, .ws_col = w};
NODE *n = newnode(VIEW, p, y, x, h, w);
if (!n)
return NULL;
SCRN *pri = &n->pri, *alt = &n->alt;
pri->win = newpad(MAX(h, SCROLLBACK), w);
alt->win = newpad(h, w);
if (!pri->win || !alt->win)
return freenode(n, false), NULL;
pri->tos = pri->off = MAX(0, SCROLLBACK - h);
n->s = pri;
nodelay(pri->win, TRUE); nodelay(alt->win, TRUE);
scrollok(pri->win, TRUE); scrollok(alt->win, TRUE);
keypad(pri->win, TRUE); keypad(alt->win, TRUE);
setupevents(n);
ris(&n->vp, n, L'c', 0, 0, NULL, NULL);
pid_t pid = forkpty(&n->pt, NULL, NULL, &ws);
if (pid < 0){
if (!p)
perror("forkpty");
return freenode(n, false), NULL;
} else if (pid == 0){
char buf[100] = {0};
snprintf(buf, sizeof(buf) - 1, "%lu", (unsigned long)getppid());
setsid();
setenv("MTM", buf, 1);
setenv("TERM", getterm(), 1);
signal(SIGCHLD, SIG_DFL);
execl(getshell(), getshell(), NULL);
return NULL;
}
FD_SET(n->pt, &fds);
fcntl(n->pt, F_SETFL, O_NONBLOCK);
nfds = n->pt > nfds? n->pt : nfds;
return n;
}
static NODE *
newcontainer(Node t, NODE *p, int y, int x, int h, int w,
NODE *c1, NODE *c2) /* Create a new container */
{
NODE *n = newnode(t, p, y, x, h, w);
if (!n)
return NULL;
n->c1 = c1;
n->c2 = c2;
c1->p = c2->p = n;
reshapechildren(n);
return n;
}
static void
focus(NODE *n) /* Focus a node. */
{
if (!n)
return;
else if (n->t == VIEW){
lastfocused = focused;
focused = n;
} else
focus(n->c1? n->c1 : n->c2);
}
#define ABOVE(n) n->y - 2, n->x + n->w / 2
#define BELOW(n) n->y + n->h + 2, n->x + n->w / 2
#define LEFT(n) n->y + n->h / 2, n->x - 2
#define RIGHT(n) n->y + n->h / 2, n->x + n->w + 2
static NODE *
findnode(NODE *n, int y, int x) /* Find the node enclosing y,x. */
{
#define IN(n, y, x) (y >= n->y && y <= n->y + n->h && \
x >= n->x && x <= n->x + n->w)
if (IN(n, y, x)){
if (n->c1 && IN(n->c1, y, x))
return findnode(n->c1, y, x);
if (n->c2 && IN(n->c2, y, x))
return findnode(n->c2, y, x);
return n;
}
return NULL;
}
static void
replacechild(NODE *n, NODE *c1, NODE *c2) /* Replace c1 of n with c2. */
{
c2->p = n;
if (!n){
root = c2;
reshape(c2, 0, 0, LINES, COLS);
} else if (n->c1 == c1)
n->c1 = c2;
else if (n->c2 == c1)
n->c2 = c2;
n = n? n : root;
reshape(n, n->y, n->x, n->h, n->w);
draw(n);
}
static void
removechild(NODE *p, const NODE *c) /* Replace p with other child. */
{
replacechild(p->p, p, c == p->c1? p->c2 : p->c1);
freenode(p, false);
}
static void
deletenode(NODE *n) /* Delete a node. */
{
if (!n || !n->p)
quit(EXIT_SUCCESS, NULL);
if (n == focused)
focus(n->p->c1 == n? n->p->c2 : n->p->c1);
removechild(n->p, n);
freenode(n, true);
}
static void
reshapeview(NODE *n, int d, int ow) /* Reshape a view. */
{
int oy, ox;
bool *tabs = newtabs(n->w, ow, n->tabs);
struct winsize ws = {.ws_row = n->h, .ws_col = n->w};
if (tabs){
free(n->tabs);
n->tabs = tabs;
n->ntabs = n->w;
}
getyx(n->s->win, oy, ox);
wresize(n->pri.win, MAX(n->h, SCROLLBACK), MAX(n->w, 2));
wresize(n->alt.win, MAX(n->h, 2), MAX(n->w, 2));
n->pri.tos = n->pri.off = MAX(0, SCROLLBACK - n->h);
n->alt.tos = n->alt.off = 0;
wsetscrreg(n->pri.win, 0, MAX(SCROLLBACK, n->h) - 1);
wsetscrreg(n->alt.win, 0, n->h - 1);
if (d > 0){ /* make sure the new top line syncs up after reshape */
wmove(n->s->win, oy + d, ox);
wscrl(n->s->win, -d);
}
doupdate();
refresh();
ioctl(n->pt, TIOCSWINSZ, &ws);
}
static void
reshapechildren(NODE *n) /* Reshape all children of a view. */
{
if (n->t == HORIZONTAL){
int i = n->w % 2? 0 : 1;
reshape(n->c1, n->y, n->x, n->h, n->w / 2);
reshape(n->c2, n->y, n->x + n->w / 2 + 1, n->h, n->w / 2 - i);
} else if (n->t == VERTICAL){
int i = n->h % 2? 0 : 1;
reshape(n->c1, n->y, n->x, n->h / 2, n->w);
reshape(n->c2, n->y + n->h / 2 + 1, n->x, n->h / 2 - i, n->w);
}
}
static void
reshape(NODE *n, int y, int x, int h, int w) /* Reshape a node. */
{
if (n->y == y && n->x == x && n->h == h && n->w == w && n->t == VIEW)
return;
int d = n->h - h;
int ow = n->w;
n->y = y;
n->x = x;
n->h = MAX(h, 1);
n->w = MAX(w, 1);
if (n->t == VIEW)
reshapeview(n, d, ow);
else
reshapechildren(n);
draw(n);
}
static void
drawchildren(const NODE *n) /* Draw all children of n. */
{
draw(n->c1);
if (n->t == HORIZONTAL)
mvvline(n->y, n->x + n->w / 2, ACS_VLINE, n->h);
else
mvhline(n->y + n->h / 2, n->x, ACS_HLINE, n->w);
wnoutrefresh(stdscr);
draw(n->c2);
}
static void
draw(NODE *n) /* Draw a node. */
{
if (n->t == VIEW)
pnoutrefresh(n->s->win, n->s->off, 0, n->y, n->x,
n->y + n->h - 1, n->x + n->w - 1);
else
drawchildren(n);
}
static void
split(NODE *n, Node t) /* Split a node. */
{
int nh = t == VERTICAL? (n->h - 1) / 2 : n->h;
int nw = t == HORIZONTAL? (n->w) / 2 : n->w;
NODE *p = n->p;
NODE *v = newview(NULL, 0, 0, MAX(0, nh), MAX(0, nw));
if (!v)
return;
NODE *c = newcontainer(t, n->p, n->y, n->x, n->h, n->w, n, v);
if (!c){
freenode(v, false);
return;
}
replacechild(p, n, c);
focus(v);
draw(p? p : root);
}