I got asked how to use the vi mode alongside with some remapped keys in fish yesterday, and since I felt like it is a useful and good thing to know, I decided to write it down here.
The command for activating the vi keybindings is
fish_vi_key_bindings, to make these permanent, it has to be added to the
~/.config/fish/config.fish config file.
I remap my escape key to
<jk>, to reduce the finger movement on the keyboard, since commonly, in the touch typing system, your right hand rests on
<hjkl>. In fish the remapping can be done by creating a
bind -M insert jk "if commandline -P; commandline -f cancel; else; set fish_bind_mode default; commandline -f backward-char force-repaint; end"