nicer command not found handler for Arch using pkgfile

fish_command_not_found.fish

function fish_command_not_found --on-event fish_command_not_found
    echo "fish: Unknown command '$argv'" >&2
    if functions  -q __fish_command_not_found_setup
        functions -e __fish_command_not_found_setup
    end
    if which pkgfile ^/dev/null >/dev/null
        if test (count $argv) -ge 1
            if pkgfile --binaries $argv[1] ^/dev/null >/dev/null
                echo -e "\n'$argv[1]' can be found in these packages:"
                for pkg in (pkgfile --binaries "$argv[1]")
                    echo -e "\t$pkg"
                end
            end
        end
    end
end