[i3/lockscreen] updated to socat & dbus

thanks to @bebehei

i3/lockscreen.sh

@@ -1,22 +1,24 @@
 #!/usr/bin/bash
 
-[ -f "~/.lockvars" ] && [ -r "~/.lockvars" ] && . ~/.lockvars
+# shellcheck source=.lockvars
+# shellcheck disable=SC1091
+[ -f "$HOME/.lockvars" ] && [ -r "$HOME/.lockvars" ] && . ~/.lockvars
 
 LOCK_TIME=${LOCK_TIME:-3}
 LOCK_NOTIFY_TIME=${LOCK_NOTIFY_TIME:-15}
 
+SOCK_PATH="/run/user/${UID}/i3/locksock-${XDG_SESSION_ID:-unknown}"
+
 if [ -n "${WAYLAND_DISPLAY}" ]; then
 	LOCK_CMD="swaylock"
 else
 	LOCK_CMD="i3lock"
 fi
 
-PROGNAME=$(basename $0)
+OUTPUT_IMAGE="$HOME/.lockscreen.png"
-
-OUTPUT_IMAGE="/tmp/i3lock.png"
 
 error(){
-	echo -e '\e[01;31m'$*'\e[0m' >&2
+	echo -e '\e[01;31m"$*"\e[0m' >&2
 }
 
 usage(){
@@ -29,8 +31,10 @@ usage(){
 	  -d execute the xautolock daemon
 	  -h help
 
-	  Mind, that the options are order-sensitive. -lf != -fl && -l == -lf
+	Mind, that the options are order-sensitive:
-		(-fl is probably the thing you want)
+	  -lf != -fl && -l == -lf
+
+	(-fl is probably the thing you want)
 	FIN
 	exit 1
 }
@@ -39,13 +43,28 @@ checkfull(){
 	[ 1 -eq "$force" ] || ~/.local/bin/checknofullscreen
 }
 
+encrypt_the_chest(){
+	if command -v systemctl &>/dev/null; then
+		systemctl hibernate || shutdown now
+	else
+		shutdown now
+	fi
+}
+
 lock(){
-	scrot -z $OUTPUT_IMAGE
+	socat /dev/null "UNIX-LISTEN:${SOCK_PATH}" &
-	convert $OUTPUT_IMAGE -resize 20% -level 0%,100%,0.9 -blur 0x2 -resize 500% $OUTPUT_IMAGE
+	local socat_pid=$!
+
+	scrot -z "$OUTPUT_IMAGE"
+	convert "$OUTPUT_IMAGE" -resize 20% -level 0%,100%,0.9 -blur 0x2 -resize 500% "$OUTPUT_IMAGE"
+
 	${LOCK_CMD} \
 	  -t \
-	  -i $OUTPUT_IMAGE
+	  -n \
-	rm $OUTPUT_IMAGE
+	  -i "$OUTPUT_IMAGE"
+
+	rm "$OUTPUT_IMAGE"
+	kill ${socat_pid}
 }
 
 notification(){
@@ -59,16 +78,40 @@ notification(){
 	  "Will Lock Screen in 15s"
 }
 
-daemon(){
+daemon_signallistener(){
+	dbus-monitor --system --profile path=/org/freedesktop/login1 2>/dev/null \
+		| while read -r _ _ _ _ _ _ _ signal _; do
+			case "${signal}" in
+				PrepareForSleep) $0 -fl & ;;
+				*) true;;
+			esac
+		done
+}
+
+daemon_xautolock() {
+	# Do not use -secure option, as we have to use -locknow
 	xautolock \
-	  -time $LOCK_TIME \
+	  -time "$LOCK_TIME" \
 	  -locker "$0 -l" \
 	  -nowlocker "$0 -fl" \
-	  -notify $LOCK_NOTIFY_TIME \
+	  -notify "$LOCK_NOTIFY_TIME" \
 	  -notifier "$0 -n" \
 	  -noclose
 }
 
+# Listen for signals from the DBus Service as
+# xautolock does not always catch system sleeps
+daemon(){
+	daemon_signallistener &
+	local pid_signal=$!
+
+	daemon_xautolock &
+	local pid_xautolock=$!
+
+	trap 'kill "${pid_xautolock}" "${pid_signal}" && wait'
+	wait
+}
+
 force=0
 
 while getopts ":hdfln" opt; do
@@ -80,7 +123,8 @@ while getopts ":hdfln" opt; do
 			force=1
 			;;
 		l)
-			checkfull && lock
+			[ -S "${SOCK_PATH}" ] \
+                || (checkfull && (lock )) #|| encrypt_the_chest))
 			;;
 		n)
 			checkfull && notification