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#include <ctype.h>
#include <err.h>
#include <fcntl.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.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__)
#define rerr(...) do { raw(false); err(__VA_ARGS__); } while (0)
char **lines;
int lines_c;
int lines_s;
int current = -1; /* currently selected item */
int x, y; /* original cursor position in cols, rows */
int ttyfd;
/* 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(ttyfd, &c, 1);
if (c != '\033') return -1;
read(ttyfd, &c, 1);
if (c != '[') return -1;
/* get x */
i = 0;
while (read(ttyfd, &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(ttyfd, &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 > lines_c) 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, *line, *p, *phrase, *tmp;
int i, line_s, r;
struct winsize w;
phrase = NULL;
ttyfd = open("/dev/tty", O_RDWR);
if (ttyfd == -1) rerr(1, "open");
/* read from standard input */
line_s = 100;
line = malloc((line_s + 1) * sizeof(char));
if (line == NULL) err(1, "malloc");
lines_c = 0;
lines_s = 50;
lines = malloc(lines_s * sizeof(char *));
if (lines == NULL) err(1, "malloc");
i = 0;
while (read(STDIN_FILENO, &c, 1) != 0) {
if (c == '\n') {
line[i] = '\0';
lines[lines_c] = malloc((strlen(line) + 1) * sizeof(char));
if (lines[lines_c] == NULL) err(1, "malloc");
strcpy(lines[lines_c], line);
lines_c++;
i = 0;
} else {
if (i > line_s) {
line_s += 50;
tmp = realloc(line, (line_s + 1) * sizeof(char));
if (tmp == NULL) err(1, "realloc");
line = tmp;
}
line[i++] = c;
}
}
raw(true);
/* save original cursor position */
r = cpr(&x, &y);
if (r == -1) {
fprintf(stderr, "could not retrieve cursor position");
goto quit;
}
/* print output */
for (i = 0; i < lines_c; i++)
prn("%s\r\n", lines[i]);
/* get height of terminal */
r = ioctl(ttyfd, TIOCGWINSZ, &w);
if (r == -1) rerr(1, "ioctl");
/* correct cursor position if original cursor was near bottom */
r = y + lines_c - 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(ttyfd, &c, 1) != 0) {
switch (c) {
case 'q':
goto quit;
break;
case '\033':
read(ttyfd, &c, 1);
if (c != '[') break;
read(ttyfd, &c, 1);
if (c == 'A') up();
if (c == 'B') down();
if (c == 'C') right();
if (c == 'D') left();
break;
case 13: /* enter */
phrase = lines[current - 1];
goto quit;
}
}
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);
return 0;
die:
raw(false);
puts("died");
return 0;
}
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