#!/bin/bash
# Turn Wi-Fi back on if it's off
# Written by Daniel Muenz in 2014

# Get the Wi-Fi interface name (e.g., en0 or en1).
# This should match the name found near AirPort's PowerEnabled key
# in /Library/Preferences/SystemConfiguration/preferences.plist
en=$(/usr/sbin/networksetup -listallhardwareports | awk '$3=="Wi-Fi" {getline; print $2}')
if [[ -z $en ]]; then
  en=en1
  echo "Could not find Wi-Fi interface name; will assume $en" 1>&2
fi

wifi_get() {
  /usr/sbin/networksetup -getairportpower $en | awk '{print $NF}'
}

wifi_set() {
  /usr/sbin/networksetup -setairportpower $en $1
}

notify() {
  /usr/bin/osascript -e "display notification \"$@\" with title \"Wi-Fi Status\""
  echo "$@" 1>&2
}


# Set Wi-Fi to 'on', but only if it's currently off
if [[ $(wifi_get) = Off ]]; then
  wifi_set On
  # Wait a little bit, then check if Wi-Fi is now on
  sleep 1
  if [[ $(wifi_get) = On ]]; then
    notify "Wi-Fi has been forced back on"
  else
    notify "Wi-Fi could not be turned back on"
  fi
fi