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/*
* Author: Thomas E. Dickey, 2006
*
* $Id: foldkeys.c,v 1.3 2006/12/09 16:54:07 tom Exp $
*
* Demonstrate a method for altering key definitions at runtime.
*
* This program reads the key definitions, merging those which have xterm-style
* modifiers into their equivalents which have no modifiers. It does this
* merging only for the keys which are defined in the terminal description.
*/
#include <test.priv.h>
#if defined(NCURSES_VERSION) && NCURSES_EXT_FUNCS
#if TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# if HAVE_SYS_TIME_H
# include <sys/time.h>
# else
# include <time.h>
# endif
#endif
#define MY_LOGFILE "demo_foldkeys.log"
#define MY_KEYS (KEY_MAX + 1)
/*
* Log the most recently-written line to our logfile
*/
static void
log_last_line(WINDOW *win)
{
FILE *fp;
int y, x, n;
char temp[256];
if ((fp = fopen(MY_LOGFILE, "a")) != 0) {
int need = sizeof(temp) - 1;
if (need > COLS)
need = COLS;
getyx(win, y, x);
wmove(win, y - 1, 0);
n = winnstr(win, temp, need);
while (n-- > 0) {
if (isspace(UChar(temp[n])))
temp[n] = '\0';
else
break;
}
wmove(win, y, x);
fprintf(fp, "%s\n", temp);
fclose(fp);
}
}
/*
* ncurses has no API for telling what the actual last key-code is. That is
* a secret because the codes past KEY_MAX are computed at run-time and may
* differ depending on the previous calls to newterm(), etc. It is unlikely
* that one could have more than a thousand key definitions...
*/
#define MAX_KEYS 2000
typedef struct {
const char *name;
const char *value;
int code;
int state;
} KeyInfo;
static void
demo_foldkeys(void)
{
KeyInfo info[MAX_KEYS];
int info_len = 0;
int merged = 0;
int code;
int j, k;
/*
* Tell ncurses that we want to use function keys. That will make it add
* any user-defined keys that appear in the terminfo.
*/
keypad(stdscr, TRUE);
/*
* List the predefined keys using the strnames[] array.
*/
for (code = 0; code < STRCOUNT; ++code) {
NCURSES_CONST char *name = strnames[code];
NCURSES_CONST char *value = tigetstr(name);
if (value != 0 && value != (NCURSES_CONST char *) -1) {
info[info_len].name = strnames[code];
info[info_len].code = key_defined(value);
info[info_len].value = value;
info[info_len].state = 0;
if (info[info_len].code > 0)
++info_len;
}
}
/*
* We can get the names for user-defined keys from keyname(). It returns
* a name like KEY_foo for the predefined keys, which tigetstr() does not
* understand.
*/
for (code = KEY_MAX; code < MAX_KEYS; ++code) {
NCURSES_CONST char *name = keyname(code);
if (name != 0) {
info[info_len].name = name;
info[info_len].code = code;
info[info_len].value = tigetstr(name);
info[info_len].state = 0;
++info_len;
}
}
printw("Initially %d key definitions\n", info_len);
/*
* Look for keys that have xterm-style modifiers.
*/
for (j = 0; j < info_len; ++j) {
int first, second;
char final[2];
char *value;
if (info[j].state == 0
&& sscanf(info[j].value,
"\033[%d;%d%c",
&first,
&second,
final) == 3
&& *final != ';'
&& (value = strdup(info[j].value)) != 0) {
sprintf(value, "\033[%d%c", first, *final);
for (k = 0; k < info_len; ++k) {
if (info[k].state == 0
&& !strcmp(info[k].value, value)) {
info[j].state = 1;
break;
}
}
if (info[j].state == 0) {
sprintf(value, "\033O%c", *final);
for (k = 0; k < info_len; ++k) {
if (info[k].state == 0
&& !strcmp(info[k].value, value)) {
info[j].state = 1;
break;
}
}
}
if (info[j].state == 1) {
if ((define_key(info[j].value, info[k].code)) != ERR) {
printw("map %s to %s\n", info[j].value, info[k].value);
keyok(info[j].code, FALSE);
++merged;
} else {
printw("? cannot define_key %d:%s\n", j, info[j].value);
}
} else {
printw("? cannot merge %d:%s\n", j, info[j].value);
}
free(value);
}
}
printw("Merged to %d key definitions\n", info_len - merged);
}
int
main(int argc GCC_UNUSED, char *argv[]GCC_UNUSED)
{
int ch;
#if HAVE_GETTIMEOFDAY
int secs, msecs;
struct timeval current, previous;
#endif
unlink(MY_LOGFILE);
newterm(0, stdout, stdin);
(void) cbreak(); /* take input chars one at a time, no wait for \n */
(void) noecho(); /* don't echo input */
scrollok(stdscr, TRUE);
keypad(stdscr, TRUE);
move(0, 0);
demo_foldkeys();
#if HAVE_GETTIMEOFDAY
gettimeofday(&previous, 0);
#endif
while ((ch = getch()) != ERR) {
bool escaped = (ch >= MY_KEYS);
const char *name = keyname(escaped ? (ch - MY_KEYS) : ch);
#if HAVE_GETTIMEOFDAY
gettimeofday(¤t, 0);
secs = current.tv_sec - previous.tv_sec;
msecs = (current.tv_usec - previous.tv_usec) / 1000;
if (msecs < 0) {
msecs += 1000;
--secs;
}
if (msecs >= 1000) {
secs += msecs / 1000;
msecs %= 1000;
}
printw("%6d.%03d ", secs, msecs);
previous = current;
#endif
printw("Keycode %d, name %s%s\n",
ch,
escaped ? "ESC-" : "",
name != 0 ? name : "<null>");
log_last_line(stdscr);
clrtoeol();
if (ch == 'q')
break;
}
endwin();
ExitProgram(EXIT_SUCCESS);
}
#else
int
main(void)
{
printf("This program requires the ncurses library\n");
ExitProgram(EXIT_FAILURE);
}
#endif
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