vpn-tun-status: add script

Author: bw00lley

polybar-scripts/vpn-tun-status/README.md

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+# Script: vpn-tun-status
+
+A script that shows the IP address for each active tun adapter.
+
+![vpn-tun-status](screenshots/1.png)
+![vpn-tun-status](screenshots/2.png)
+
+
+## Dependencies
+
+* `jq`
+
+
+## Module
+
+```ini
+[module/vpn-tun-status]
+type = custom/script
+exec = ~/polybar-scripts/vpn-tunX-ip.sh
+interval = 10
+```

polybar-scripts/vpn-tun-status/screenshots/1.png

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+#!/bin/sh
+
+# Set format options
+FORMAT_UP=''
+FORMAT_DOWN='%{F#FF0000}'
+
+# Count the number of tun adapters, e.g. tun0, tun1, etc
+TUNTAPS=$(ip -j tuntap list | jq -r '.[].ifname' | grep -c '^tun' )
+
+if [ "$TUNTAPS" != "0" ]; then
+    # This filters the JSON output from ip to show "name ip.ip.ip.ip" for each adapter
+    MESSAGE_UP=$(\
+        ip -4 -j addr show \
+        | jq '[ .[] | select( .ifname | startswith("tun")) | [ .ifname, .addr_info[0].local ]  ]'\
+        | jq '[ .[] | join(" ") ]' \
+        | jq -r 'join(", ")'\
+    )
+    echo "$FORMAT_UP$MESSAGE_UP"
+else
+    MESSAGE_DOWN='VPN down'
+    echo "$FORMAT_DOWN$MESSAGE_DOWN"
+fi