function fish_mode_prompt
    if test "$fish_key_bindings" = "fish_vi_key_bindings"
        or test "$fish_key_bindings" = "fish_hybrid_key_bindings"
        switch $fish_bind_mode
            case default
                prompt_segment blue black "N"
            case insert
                prompt_segment green black "I"
            case replace_one
                prompt_segment red black "R"
            case visual
                prompt_segment magenta black "V"
        end
    end
end