How to use symbol keys in keybindings

Needed apps:

wev - an app to register the input and tell the key codes for it. You can install it with yay wev.

Problem:

By default, in your Hyprland config file, if you use symbol keys in keybindings such as:

bind = $mainMod, -, exec, ~/.scripts/smallgaps.sh

may not work. Instead you should find the key code or the symbol name for that symbol. Instead, you have to write it this way:

bind = $mainMod, code:20, exec, ~/.scripts/smallgaps.sh

bind = $mainMod, minus, exec, ~/.scripts/smallgaps.sh

Now this would accept the keybinding and work as intended.

How to find the key code or the name?

Launch the app called wev in your terminal.
It will open a checkered window as well, I don't know what it is used for.
Press the key that you want to find out the code for.
Then with the checkered window in focus, close the app with mod+q.
For example let's try to find out the code for - key. This will produce a long output and in the output somewhere, you will see something like this:

[14:     wl_keyboard] key: serial: 14337; time: 6744496; key: 20; state: 1 (pressed)
                      sym: minus        (45), utf8: '-'
[14:     wl_keyboard] key: serial: 14338; time: 6744573; key: 20; state: 0 (released)
                      sym: minus        (45), utf8: ''

Above, the word next to the output sym is the name of the key that you have pressed. So in this case, it is the minus key.

The number next to the output key is the key code that you can use in your Hyprland config file. So here's the result:

code:20

or for the name:

minus