start-synergy: Wait for connection to counterpart, then start Synergy.

start-synergy

#!/usr/local/bin/bash
set -eux -o pipefail

## this runs on both the client and server Mac
## configure CLIENT and SERVER appropriately
## brew install terminal-notifier
## use with e.g. ControlPlane (launch this script when Thunderbolt network connection becomes active)

CLIENT=my-client-mac.local
SERVER=the-server-mac.local

notif () {
	[ -z "$1" ] && return 0
	MSG="$1"
	echo "${MSG}" | /usr/local/bin/terminal-notifier -title "${THIS}"
}
toLower () { tr '[:upper:]' '[:lower:]' <<< "$1"; }

if [ $( toLower "${HOSTNAME}" ) == $( toLower "${CLIENT}" ) ]; then TARGET="${SERVER}"; else TARGET="${CLIENT}"; fi

LOOP=0
TRIES=3
THIS="$( basename "$0" )" || THIS="start-synergy"

# wait one minute between tries, up to $TRIES tries
notif "Waiting for connection"
until ping -o "${TARGET}" || [ $LOOP -gt $TRIES ]; do sleep 60; (( LOOP++ )); done
( pkill -i synergy 2>/dev/null || : )
if open -nj /Applications/Synergy.app/ ; then
	notif "Started Synergy"
else 
	notif "Failed to start Synergy"
fi