s2cctl

#! /bin/sh
logfile="$HOME/.Space2Ctrl.log"

start() {
	origmap=$(xmodmap -pke | grep -E "^keycode[[:blank:]]*?65")
	#newmap=$(echo ${origmap} | perl -pe "s/65[[:blank:]]*?=[[:blank:]]*?space/65  = Control_L/")
	newmap=$(echo ${origmap} | perl -pe "s/ space/ Control_L/g")

	xmodmap -e "$newmap"
	xmodmap -e "keycode 255 = space VoidSymbol VoidSymbol VoidSymbol VoidSymbol"

	# Lousy way to get the current (active) XServer display
	# https://unix.stackexchange.com/questions/203844/how-to-find-out-the-current-active-xserver-display-number
	display=$(who | awk -v term="`cat /sys/class/tty/tty0/active`" '/\(:/ $0 ~ term { gsub(/\(|\)/, "", $0); print $5 }')
	# Run s2c automatically passing the current display as parameter
	nohup ${0%/*}/s2c $display >> "$logfile" 2>&1 &

	sleep 1 # Don't ask me why but we need to wait more than one second else the ctrl modifier is
		# reinitialized to XK_Control_L XK_Control_R as soon as keycode 65 is pressed!
	`xmodmap -e "add control = Control_L Control_R"`
	echo "Space2Ctrl is now active (logfile: $logfile)"
	exit 0
}

stop() {
	origmap=$(xmodmap -pke | grep -E "^keycode[[:blank:]]*?65")
	newmap=$(echo ${origmap} | perl -pe "s/ Control_L/ space/g")
	xmodmap -e "$newmap"
	xmodmap -e "keycode 255 ="
	xmodmap -e "clear control"
	xmodmap -e "add control = Control_L"
	xmodmap -e "add control = Control_R"
	kill -s TERM `pgrep s2c` 2>&1
}

case $1 in
	start)
		echo "Starting Space2Ctrl..."
		start;;
	stop)
		echo "Stopping Space2Ctrl..."
		stop;;
	*)
		echo "Please pass start or stop";;
esac