fish_prompt is a function with definition
function fish_prompt --description 'Write out the prompt'
	set last_ret $status
	# Just calculate these once, to save a few cycles when displaying the prompt
	if not set -q __fish_prompt_hostname
		set -g __fish_prompt_hostname (hostname|cut -d . -f 1)
	end

	if not set -q __fish_prompt_normal
		set -g __fish_prompt_normal (set_color normal)
	end

	if not set -q __fish_prompt_cwd
		set -g __fish_prompt_cwd (set_color $fish_color_cwd)
	end

	if not set -q __fish_prompt_colors
		set -g __fish_prompt_color_red (set_color -o red)
		set -g __fish_prompt_color_yellow (set_color -o yellow)
		set -g __fish_prompt_color_green (set_color -o green)
	end

	printf '%s[%s%s%s] %s%s@%s %s%s%s%s%s> ' "$__fish_prompt_color_red" "$__fish_prompt_color_yellow" $last_ret "$__fish_prompt_color_red" "$__fish_prompt_color_green" $USER $__fish_prompt_hostname "$__fish_prompt_cwd" (prompt_pwd) "$__fish_prompt_color_yellow" (__fish_git_branch_prompt) "$__fish_prompt_normal"
end