gxhk is a hotkey daemon for X, something like sxhkd. What makes it special is the fact that it can be configured on-the-fly the same way as bspwm: through a socket in which commands to bind keys, to unbind previously bound keys, or even infos about the bound keys can be sent and displayed by clients.
Hotkeys are case-insensitive, with this syntax: modifier1-modifier2-...-key. For more info on this, check this link of the underlaying library. Note that, for this moment, controling for the lock (Caps Lock) and the mod2 (Num Lock) modifiers isn't allowed.
The app uses by default some config files: /etc/gxhkrc and $XDG_CONFIG_HOME/gxhk/gxhkrc. Using the -C flag, they can be ignored, and with the -c flag, new ones can be specified. Using the -s flag, a different socket besides the default /tmp/gxhk$DISPLAY.sock can be specified.
Here are some examples:
$ gxhk bind mod4-d 'rofi -show drun' # Spawn the rofi app menu when Super+d gets pressed
$ gxhk bind mod4-d 'rofi -show drun' 'Launch app menu' # The same thing, but with a description
$ gxhk bind Print 'maim ~/screenshot-$(date +%s).png && notify-send "Screenshot saved!"' # The command will be run using `sh -c`, so feel free to add variables, command chains, etc.
$ gxhk bind -r Mod4-Shift-Return '$TERMINAL' 'Launch terminal' # The terminal will be spawned when the hotkey Super+Shift+Enter gets released, not when it gets pressed as it happens with the ones above
$ gxhk info # Shows all the bound hotkeys so far
On mod4-d press: Launch app menu
On print press: Spawn 'maim ~/screenshot-$(date +%s).png && notify-send "Screenshot saved!"'
On mod4-shift-return release: Launch terminal
$ gxhk unbind Mod4-d # The Super+d hotkey will be unbound
$ gxhk info # Let's see what happens now
On print press: Spawn 'maim ~/screenshot-$(date +%s).png && notify-send "Screenshot saved!"'
On mod4-shift-return release: Launch terminalYou can check the gxhkrc file for more inspiration, or, once you've installed the app, just copy the default config file like this: install -Dm755 /etc/gxhkrc ~/.config/gxhk/gxhkrc and start editing.
Install the gxhk-git package from the AUR the way you like it. For instance, I like it this way:
yay -S gxhk-git
Run make build to build the app, then sudo make install to install it.