My preferred custom fish shell prompt

fish_prompt.txt

function fish_prompt
	printf '%s' (set_color normal) '[' (set_color --bold brgreen) "$USER@$hostname " (set_color normal; set_color green) (echo $PWD | sed -e "s|^$HOME|~|") (set_color normal) ']$ '                                  
end

Looks like:
[USER@HOSTNAME ~/My/current/directory]$ _
where - USER@HOSTNAME has a bright green, boldface format
      - ~/My/current/directory has a normal green format
      - the rest are normal white