This is currently my .xsessionrc file:
xmodmap -e "remove Mod4 = Hyper_L" -e "add Mod3 = Hyper_L" -e "lock = Hyper_L" -e "keysym Caps_Lock = Hyper_L" &
bspwm &
xfdesktop -D &
What I did was unset Hyper_L as a Mod4 modifier (which is taken by the Super key), remove it from the Lock modifier (because it also made uppercase letters), set it to Mod3 and then bind the Caps_Lock key as Hyper_L.
This works, but I'd like to achieve this using setxkbmap. I know that I can just use setxkbmap -option caps:hyper but I should also set the appropriate modifiers and I have no idea on how to do this.
Also, is .xsessionrc the appropriate file to put such commands?
