initial

tmux/powerline/segments/wan_ip.sh

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+# 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
+}