alarmclock

#!/bin/bash
soundClipPath=${1:?"\$soundClipPath not set, check start-alarmclock."}
sink=${2:?"\$sink not set, check start-alarmclock."}
initalVolume=${3:?"\$initialVolume not set, check start-alarmclock."}
pipe=/tmp/pactl-output$$

volumeStepIncrease=${4:-"+0%"}
volumeStepDuration=${5:-"0s"}
volumeSteps=${6:-"0"}

#Subscribe a custom pipe to pactl
mkfifo "$pipe"
pactl subscribe > "$pipe"&

pactl set-sink-mute "$sink" 0
pactl set-sink-volume "$sink" "$initalVolume"
echo "Volume at $initalVolume"
ffplay "$soundClipPath" -loop 0 -nodisp -loglevel quiet&
ffplayPID=$!

#Wait for ffplay to register (2 events for the creation and the deletion of a
#first ffmpeg stream plus another one, the real one, which closes the grep)
cat "$pipe" | grep -m2 sink-input

#Switch all sources to our sink once it's done
#Can't use the id from the pipe, as ffplay somehow changes stream right at the start
echo "FFplay has registered."
pactl list short sink-inputs | while read sinkInput; do
	sourceId=`echo "$sinkInput" | cut -d $'\t' -f1`
	echo "Moving #$sourceId to sink #$sink"
	pactl move-sink-input "$sourceId" "$sink"
done

#The pipe can now be deleted
if [ -p "$pipe" ];then
	rm "$pipe"
fi

#Increase the volume over time
if [ $volumeSteps != "0" ] && [ $volumeStepIncrease != "+0%" ] && [ $volumeStepDuration != "0s" ]; then
#Fuck me, bash does bracket expansion BEFORE variable expansion?
	for i in $(eval echo {0..$volumeSteps}); do
		sleep $volumeStepDuration
		pactl set-sink-volume "$sink" $volumeStepIncrease
		echo "Volume up by $volumeStepIncrease"
	done && echo "Volume at maximum"&
fi
wait $ffplayPID
#Stop fiddling with the volume if/when ffplay dies
kill $(jobs -p)