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
|
#include <ctype.h>
#include <err.h>
#include <fcntl.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/ttydefaults.h>
#include <termios.h>
#include <unistd.h>
#define ESC "\033"
#define CSI ESC "["
#define prn(...) dprintf(ttyfd, __VA_ARGS__)
char *lines[3] = {
"line 1",
"line 2",
"line 3"
};
int current = -1; /* currently selected item */
int height = 3; /* height of output in rows */
int ttyfd;
int x, y; /* original cursor position in cols, rows */
/* enable/disable "raw" mode */
void raw(bool enable) {
int r;
static struct termios orig;
struct termios raw;
if (enable) {
r = tcgetattr(ttyfd, &orig);
if (r == -1) err(1, "tcgetattr");
raw = orig;
raw.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
raw.c_oflag &= ~OPOST;
raw.c_cflag |= CS8;
raw.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
r = tcsetattr(ttyfd, TCSAFLUSH, &raw);
if (r == -1) err(1, "tcsetattr");
} else
tcsetattr(ttyfd, TCSAFLUSH, &orig);
}
/* cursor position report */
int cpr(int *x, int *y) {
char c, xbuf[4], ybuf[4];
int i;
prn(CSI "6n");
/* get CSI */
read(1, &c, 1);
if (c != '\033') return -1;
read(1, &c, 1);
if (c != '[') return -1;
/* get x */
i = 0;
while (read(1, &c, 1) && c != ';') {
if (i > 3 || !isdigit(c)) return -1;
ybuf[i++] = c;
}
if (i == 0) return -1;
ybuf[i] = '\0';
/* get y */
i = 0;
while (read(1, &c, 1) && c != 'R') {
if (i > 3 || !isdigit(c)) return -1;
xbuf[i++] = c;
}
if (i == 0) return -1;
xbuf[i] = '\0';
*x = atoi(xbuf);
*y = atoi(ybuf);
return 0;
}
/* select item */
int item(int n) {
if (n < 1 || n > height) return -1;
if (current != -1)
prn("%s", lines[current - 1]);
current = n;
prn("%s%d;%dH", CSI, y + n - 1, 0);
prn(CSI "7m");
prn("%s", lines[n - 1]);
prn(CSI "0m");
prn("%s%d;%dH", CSI, y + n - 1, 0);
return 0;
}
int up() { return item(current-1); }
int down() { return item(current+1); }
int right() {}
int left() {}
int main() {
char c, *p, *phrase;
int i, r;
struct winsize w;
phrase = NULL;
ttyfd = open("/dev/tty", O_RDWR);
if (ttyfd == -1) err(1, "open");
raw(true);
/* save original cursor position */
r = cpr(&x, &y);
if (r == -1) goto quit;
/* print output */
for (i = 0; i < height; i++)
prn("%s\r\n", lines[i]);
/* get height of output */
/*
p = ex - 1;
height = 0;
while (*(++p) != '\0')
if (*p == '\n') height++;
/* get height of terminal */
r = ioctl(ttyfd, TIOCGWINSZ, &w);
if (r == -1) err(1, "ioctl");
/* correct cursor position if original cursor was near bottom */
r = y + height - w.ws_row;
if (r > 0)
y = y - r;
/* restore original cursor position (CUP) */
prn("%s%d;%dH", CSI, y, x);
/* select first item */
item(1);
while (read(0, &c, 1) != 0) {
switch (c) {
case 'q':
goto quit;
break;
case '\033':
read(0, &c, 1);
if (c != '[') break;
read(0, &c, 1);
if (c == 'A') up();
if (c == 'B') down();
if (c == 'C') right();
if (c == 'D') left();
break;
case 13: /* enter */
goto quit;
phrase = lines[current - 1];
break;
}
}
quit:
//prn("%s%d;%dH", CSI, y, x);
//prn(CSI "J"); /* delete from cursor to end of display (ED) */
raw(false);
if (phrase != NULL)
printf("%s\n", phrase);
}
|