# Prints the WAN IP address. The result is cached and updated according to $update_period.

run_segment() {
	local tmp_file="${TMUX_POWERLINE_DIR_TEMPORARY}/wan_ip.txt"
	local wan_ip

	if [ -f "$tmp_file" ]; then
		if shell_is_osx || shell_is_bsd; then
			stat >/dev/null 2>&1 && is_gnu_stat=false || is_gnu_stat=true
			if [ "$is_gnu_stat" == "true" ];then
				last_update=$(stat -c "%Y" ${tmp_file})
			else
				last_update=$(stat -f "%m" ${tmp_file})
			fi
		elif shell_is_linux || [ -z $is_gnu_stat]; then
			last_update=$(stat -c "%Y" ${tmp_file})
		fi

		time_now=$(date +%s)
		update_period=900
		up_to_date=$(echo "(${time_now}-${last_update}) < ${update_period}" | bc)

		if [ "$up_to_date" -eq 1 ]; then
			wan_ip=$(cat ${tmp_file})
		fi
	fi

	if [ -z "$wan_ip" ]; then
		wan_ip=$(curl --max-time 2 -s http://whatismyip.akamai.com/)

		if [ "$?" -eq "0" ]; then
			echo "${wan_ip}" > $tmp_file
		elif [ -f "${tmp_file}" ]; then
			wan_ip=$(cat "$tmp_file")
		fi
	fi

	if [ -n "$wan_ip" ]; then
		echo "ⓦ ${wan_ip}"
	fi

	return 0
}