sxmo_timer.sh: allow suspension while running

To do this, we implement a new sxmo_sleep program that is a sleep
but that can wake the device from suspension when the timer expires.

Also, stopwatch can perfectly survive a suspension. So we don't have to
wakelock on this.

scripts/appscripts/sxmo_timer.sh

@@ -6,13 +6,34 @@
 # shellcheck source=scripts/core/sxmo_common.sh
 . sxmo_common.sh
 
+_finish_timerrun() {
+	_releasealarm
+	exit
+}
+
+_setupalarm() {
+	sxmo_sleep -c boottime_alarm "$1" &
+	alarmpid=$!
+}
+
+_releasealarm() {
+	if [ -n "$alarmpid" ]; then
+		kill "$alarmpid" 2> /dev/null
+		unset alarmpid
+	fi
+}
+
 timerrun() {
+	trap '_finish_timerrun' INT TERM EXIT
+
 	TIME="$(
 		echo "$@" |
 		sed 's/\([^0-9]\)\([0-9]\)/\1+\2/g; s/h/*60m/g; s/m/*60s/g; s/s//g' |
 		bc
 	)"
 
+	_setupalarm "$TIME"
+
 	DATE1="$(($(date +%s) + TIME))";
 	while [ "$DATE1" -ge "$(date +%s)" ]; do
 		printf "%s\r" "$(date -u --date @$((DATE1 - $(date +%s))) +%H:%M:%S)";
@@ -20,6 +41,8 @@ timerrun() {
 	done
 	echo "Done with $*"
 
+	_releasealarm
+
 	while : ;
 		do notify-send  "Done with $*";
 		sxmo_vibrate 1000 "${SXMO_VIBRATE_STRENGTH:-1}"
@@ -27,10 +50,6 @@ timerrun() {
 	done
 }
 
-cleanwakelock() {
-	sxmo_wakelock.sh unlock sxmo_"$(basename "$0")"
-}
-
 stopwatchrun() {
 	start="$(date +%s)"
 	while : ; do
@@ -63,13 +82,9 @@ EOF
 			exit 0
 			;;
 		"Stopwatch")
-			sxmo_wakelock.sh lock sxmo_"$(basename "$0")" infinite
-			trap 'cleanwakelock' INT TERM EXIT
 			sxmo_terminal.sh "$0" stopwatchrun
 			;;
 		*)
-			sxmo_wakelock.sh lock sxmo_"$(basename "$0")" infinite
-			trap 'cleanwakelock' INT TERM EXIT
 			sxmo_terminal.sh "$0" timerrun "$TIMEINPUT"
 			;;
 	esac