Fish Dir path toggle function

keymapping.fish

function fish_user_key_bindings
  bind ' ' __toggle_dir_length # toggle PWD on NORMAL mode
end

toggle_dir.fish

function __toggle_dir_length -d "Toggle Directory length in prompt"
    set -q fish_prompt_pwd_dir_length; or set -l fish_prompt_pwd_dir_length 0
    if [ $fish_prompt_pwd_dir_length -eq 0 ]
        set -U fish_prompt_pwd_dir_length 1
    else
        set -U fish_prompt_pwd_dir_length 0
    end
    commandline -f repaint
end