setup

#!/bin/bash

PLIST_DIR=$HOME/Library/LaunchAgents
realpath() {
    [[ $1 = /* ]] && echo "$1" || echo "$PWD/${1#./}"
}
DIR=$(dirname $(realpath "$0"))

case "$1" in 
	install)
cat > $PLIST_DIR/LocationChanger.plist << EOT
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>Label</key>
    <string>locationchanger</string>
    <key>ProgramArguments</key>
    <array>
        <string>$DIR/location-changer</string>
    </array>
    <key>WatchPaths</key>
    <array>
        <string>/Library/Preferences/SystemConfiguration/com.apple.airport.preferences.plist</string>
    </array>
</dict>
</plist>
EOT

cat > $PLIST_DIR/LocationChanged.plist << EOT
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>Label</key>
    <string>locationchanged</string>
    <key>OnDemand</key>
    <true/>
    <key>ProgramArguments</key>
    <array>
        <string>$DIR/location-changed</string>
    </array>
    <key>WatchPaths</key>
    <array>
        <string>/Library/Preferences/SystemConfiguration/preferences.plist</string>
    </array>
</dict>
</plist>
EOT

# Avoid overwriting preferences
[ ! -d ~/.locations ] && cp -R .locations ~/
launchctl unload ~/Library/LaunchAgents/LocationChanger.plist
launchctl unload ~/Library/LaunchAgents/LocationChanged.plist
launchctl load ~/Library/LaunchAgents/LocationChanger.plist
launchctl load ~/Library/LaunchAgents/LocationChanged.plist
	;;
	uninstall)
launchctl unload ~/Library/LaunchAgents/LocationChanger.plist
launchctl unload ~/Library/LaunchAgents/LocationChanged.plist
rm ~/Library/LaunchAgents/LocationChanger.plist
rm ~/Library/LaunchAgents/LocationChanged.plist
	;;
	*)
	echo "Usage: $0 [install | uninstall]"
	;;
esac