How to remap keyboard keys based on how long you hold the key
I just wrote this in C:
#include <stdio.h>
#include <curses.h>
#include <time.h> //time(0)
#include <sys/time.h> // gettimeofday()
#include <stdlib.h>
void waitFor (unsigned int secs) {
//credit: http://stackoverflow.com/a/3930477/1074998
unsigned int retTime = time(0) + secs; // Get finishing time.
while (time(0) < retTime); // Loop until it arrives.
}
int
main(void) {
struct timeval t0, t1, t2, t3;
double elapsedTime;
clock_t elapsed_t = 0;
int c = 0x35;
initscr();
cbreak();
noecho();
keypad(stdscr, TRUE);
halfdelay(5); //increae the number if not working //adjust below `if (elapsedTime <= 0.n)` if this changed
printf("\nSTART again\n");
elapsed_t = 0;
gettimeofday(&t0, NULL);
float diff;
int first = 1;
int atleast_one = 0;
while( getch() == c) { //while repeating same char, else(ffff ffff in my system) break
int atleast_one = 1;
if (first == 1) {
gettimeofday(&t1, NULL);
first = 0;
}
//printf("DEBUG 1 %x!\n", c);
gettimeofday(&t2, NULL);
elapsedTime = (t2.tv_sec - t1.tv_sec) + ((t2.tv_usec - t1.tv_usec)/1000000.0);
if (elapsedTime > 1) { //hit max time
printf("Hit Max, quit now. %f\n", elapsedTime);
system("gnome-terminal");
//waitFor(4);
int cdd;
while ((cdd = getch()) != '\n' && cdd != EOF);
endwin();
exit(0);
}
if(halfdelay(1) == ERR) { //increae the number if not working
//printf("DEBUG 2\n");
//waitFor(4);
break;
}
else {
//printf("DEBUG 3\n");
}
}
if (atleast_one == 0) {
//gettimeofday(&t1, NULL);
t1 = t0;
}
gettimeofday(&t3, NULL);
elapsedTime = (t3.tv_sec - t1.tv_sec) + ((t3.tv_usec - t1.tv_usec)/1000000.0);
printf("Normal quit %f\n", elapsedTime);
if (elapsedTime > 0.6) { //this number based on halfdelay above
system("gedit &");
//system("xdotool key shift+left &");
//system("mplayer -vo caca -quiet 'video.mp4' &");
//waitFor(4);
}
else if (elapsedTime <= 0.6) {
system("xdotool key ctrl+shift+t &");
//waitFor(4);
}
int cdd;
while ( (cdd = getch() ) != '\n' && cdd != EOF);
endwin();
return 0;
}
Use showkey -a to get the bind keycode:
xb@dnxb:/tmp$ sudo showkey -a
Press any keys - Ctrl-D will terminate this program
^[[24~ 27 0033 0x1b #pressed F12
91 0133 0x5b
50 0062 0x32
52 0064 0x34
126 0176 0x7e
5 53 0065 0x35 #pressed Numpad 5, 5 is the keycode used in `bind`
^C 3 0003 0x03
^D 4 0004 0x04
xb@dnxb:/tmp$
Put the bind keycode 5 and its command(e.g. run /tmp/.a.out) in ~/.bashrc:
bind '"5":"/tmp/a.out\n"'
Note that relevant keycode need to change in the source code too (the hex value can get from sudo showkey -a above too):
int c = 0x35;
Compile with (output to /tmp/a.out in my example):
cc filename.c -lcurses
Demonstration:
Numpad 5, short press open new tab, medium press open gedit, and long press open gnome-terminal.
This is not direct applicable in any window on gnome desktop manager, but i think it should give you some idea how (hard) to implement it. It work in Virtual Console(Ctrl+Alt+N) too, and work in some terminal emulator (e.g. konsole, gnome-terminal, xterm).
p/s: I'm not a c programmer, so forgive me if this code is not optimized.
[UPDATE]
The previous answer only work in shell and required focus, so i think parse the /dev/input/eventX is the solution to work in entire X session.
I don't want to reinvent the wheel. I play around with evtest utility and modified the bottom part of evtest.c with my own code:
int onHold = 0;
struct timeval t0;
double elapsedTime;
int hitMax = 0;
while (1) {
rd = read(fd, ev, sizeof(struct input_event) * 64);
if (rd < (int) sizeof(struct input_event)) {
perror("\nevtest: error reading");
return 1;
}
system("echo 'running' >/tmp/l_is_running 2>/tmp/l_isrunning_E &");
for (i = 0; i < rd / sizeof(struct input_event); i++) {
//system("date >/tmp/l_date 2>/tmp/l_dateE &");
if (ev[i].type == EV_KEY) {
if ( (ev[i].code == 76) ) {
if (!onHold) {
onHold = 1;
t0 = ev[i].time;
hitMax = 0;
}
if (!hitMax) { //to avoid hitMax still do the time checking instruction, you can remove hitMax checking if you think it's overkill, but still hitMax itself is necessary to avoid every (max) 2 seconds will repeatly system();
elapsedTime = (ev[i].time.tv_sec - t0.tv_sec) + ((ev[i].time.tv_usec - t0.tv_usec)/1000000.0);
printf("elapsedTime: %f\n", elapsedTime);
if (elapsedTime > 2) {
hitMax = 1;
printf("perform max time action\n");
system("su - xiaobai -c 'export DISPLAY=:0; gedit &'");
}
}
if (ev[i].value == 0) {
printf("reseted ...... %d\n", ev[i].value);
onHold = 0;
if (!hitMax) {
if (elapsedTime > 1) { //just ensure lower than max 2 seconds
system("su - xiaobai -c 'export DISPLAY=:0; gnome-terminal &'");
} else if (elapsedTime > 0.5) {
system("su - xiaobai -c \"export DISPLAY=:0; vlc '/home/xiaobai/Downloads/videos/test/Pokémon Red_Blue_Yellow Gym Leader Battle Theme Remix-CbJTkx7QUJU.mp4' &\"");
} else if (elapsedTime > 0.2) {
system("su - xiaobai -c 'export DISPLAY=:0; nautilus &'");
}
} else { //else's max system() already perform
hitMax = 0;
}
}
}
}
}
}
Note that you should change the username (xiaobai is my username) part. And also the if ( (ev[i].code == 76) ) { is my Numpad 5 keycode, you might need to manually print the ev[i].code to double confirm. And of course you should change the video path too :)
Compile and test it directly with (the `` part is in order to get the correct /dev/input/eventN):
$ gcc /home/put_your_path/my_long_press.c -o /home/put_your_path/my_long_press; sudo /home/put_your_path/my_long_press `ls -la /dev/input/by-path/* | grep kbd | echo "/dev/input/""$(awk -F'/' '{print $NF}')" ` &
Note that /by-id/ doesn't work in Fedora 24, so i change it to /by-path/. Kali no such problem.
My desktop manager is gdm3:
$ cat /etc/X11/default-display-manager
/usr/sbin/gdm3
So, i put this line in /etc/gdm3/PostLogin/Default to run this command as root on gdm startup (/etc/X11/Xsession.d/* doesn't work):
/home/put_your_path/my_long_press `ls -la /dev/input/by-id/* | grep kbd | echo "/dev/input/""$(awk -F'/' '{print $NF}')" 2>/tmp/l_gdm` 2>/tmp/l_gdmE &
For unknown reason /etc/gdm/PostLogin/Default doesn't work on Fedora 24' gdm which give me "Permission denied" when check /tmp/l_gdmE log. Manually run no problem though.
Demonstration:
Numpad 5, instant-press (<=0.2 second) will be ignored, short-press (0.2 to 0.5 second) open nautilus, medium-press (0.5 to 1 second) open vlc to play video, long-press (1 to 2 seconds) open gnome-terminal, and timeout-press (2 seconds) open gedit.
I uploaded the full code(only one file) here.
[UPDATE again]
[1] Added multiple keys flow and fixed notify-send failed by define DBUS_SESSION_BUS_ADDRESS.
[2] Added XDG_CURRENT_DESKTOP and GNOME_DESKTOP_SESSION_ID to ensure konsole use gnome theme gui (Change it if you're not using gnome).
I updated my code here.
Note that this code doesn't handle for combination keys flow, e.g. Ctrl+t.
UPDATE:
There's multiple device interfaces which the /dev/input/by-path/XXX-eventN entries sequence is random. So I change the command in /etc/gdm3/PostLogin/Default as below (Chesen is my keyboard name, for your case, you should changed it to grep Razer instead):
/your_path/my_long_press "$(cat /proc/bus/input/devices | grep -i Chesen -A 4 | grep -P '^(?=.*sysrq)(?=.*leds)' | tr ' ' '\n' | ls /dev/input/`grep event`)" 2>/tmp/l_gdmE &
You can try the eventN extract from cat /proc/bus/input/devices | grep -i Razer -A 4:
$ cat /proc/bus/input/devices | grep -i Razer -A 4
N: Name="Razer Razer Naga Chroma"
P: Phys=usb-0000:00:14.0-1.3/input0
S: Sysfs=/devices/pci0000:00/0000:00:14.0/usb3/3-1/3-1.3/3-1.3:1.0/0003:1532:0053.0003/input/input6
U: Uniq=
H: Handlers=mouse2 event5
--
N: Name="Razer Razer Naga Chroma"
P: Phys=usb-0000:00:14.0-1.3/input1
S: Sysfs=/devices/pci0000:00/0000:00:14.0/usb3/3-1/3-1.3/3-1.3:1.1/0003:1532:0053.0004/input/input7
U: Uniq=
H: Handlers=sysrq kbd event6
--
N: Name="Razer Razer Naga Chroma"
P: Phys=usb-0000:00:14.0-1.3/input2
S: Sysfs=/devices/pci0000:00/0000:00:14.0/usb3/3-1/3-1.3/3-1.3:1.2/0003:1532:0053.0005/input/input8
U: Uniq=
H: Handlers=sysrq kbd leds event7
$
In this example above, only sudo cat /dev/input/event7 will print bizarre output when click the 12 digits on Razer mouse, which has the pattern "sysrq kbd leds event7" to use in grep -P '^(?=.*sysrq)(?=.*leds)' above (your pattern might vary). sudo cat /dev/input/event6 will print bizarre output only when click the middle up/down key. While sudo cat /dev/input/event5 will print bizarre output when move your mouse and scrolling the wheel.
[Update: Support Replug keyboard cable to reload the program]
The following should be self-explanation:
$ lsusb #to know my keyboard is idVendor 0a81 and idProduct 0101
...
Bus 001 Device 003: ID 0a81:0101 Chesen Electronics Corp. Keyboard
$ cat /etc/udev/rules.d/52-hole-keyboard.rules #add this line with your idVendor and idProduct above in custom udev rules file
ACTION=="add", SUBSYSTEM=="usb", ATTR{idVendor}=="0a81", ATTR{idProduct}=="0101", MODE="0666", GROUP="plugdev", RUN+="/bin/bash -c 'echo 1 > /tmp/chesen_plugged'"
$ cat /usr/local/bin/inotifyChesenPlugged #A long run listener script to listen for modification of /tmp/chesen_plugged #Ensures `inotifywait` has been installed first.
touch /tmp/chesen_plugged
while inotifywait -q -e modify /tmp/chesen_plugged >/dev/null; do
killall -9 my_long_press
/usr/local/bin/startLongPress &
done
$ cat /usr/local/bin/startLongPress #the executable script run the long press executable #Change with your pattern as explained above.
#!/bin/bash
<YOUR_DIR>/my_long_press "$(cat /proc/bus/input/devices | grep -i Chesen -A 4 | grep -P '^(?=.*sysrq)(?=.*leds)' | tr ' ' '\n' | ls /dev/input/`grep event`)" 2>/tmp/l_gdmE) & disown
$ cat /etc/gdm3/PostLogin/Default #the executable startup script run listener and long press script
/usr/local/bin/inotifyChesenPlugged &
/usr/local/bin/startLongPress &