Bash Suspend Alarm Clock with Gradual Volume and Fallback

alarm.sh

#!/bin/bash

__script_version="1.1"


#-----------------------------------------------------------------------
#  Default values
#-----------------------------------------------------------------------

human_time="6:20 tomorrow"
media_url="http://178.33.191.197:6060"


#===  FUNCTION  ================================================================
#         NAME:  gradual
#  DESCRIPTION:  Increase the volume gradually to 100.
#===============================================================================
function gradual ()
{
	ponymix set-volume 10 > /dev/null

	current_volume=$(ponymix get-volume)
	while [[ current_volume -lt 100 ]]
	do
		sleep 0.5
		current_volume=$(ponymix increase 1)
	done

}    # ----------  end of function gradual  ----------


#===  FUNCTION  ================================================================
#         NAME:  fallback
#  DESCRIPTION:  Play obnoxious speaker-test tones.
#===============================================================================
function fallback ()
{
	got_input=142

	until [ $got_input -eq 0 ]
	do
		frequency=$(shuf -i 200-600 -n 1)
		speaker-test -f $frequency -t sine -l 1 > /dev/null &

		disown $! # avoid useless kill messages

		duration=$(echo "$(shuf -i 5-25 -n 1) * 0.1" | bc)
		read -t $duration # play beep for .5 to 2.5 seconds
		got_input=$?

		pkill -9 --ns $$ speaker-test
	done

}    # ----------  end of function fallback  ----------


#===  FUNCTION  ================================================================
#         NAME:  usage
#  DESCRIPTION:  Display usage information.
#===============================================================================
function usage ()
{
	echo "Usage :  $0 [options] [--]

	Options:
	-h|help       Display this message
	-v|version    Display script version
	-m|media      The audio url, to be played by mpv
	-t|time       The human readable time and date for the alarm"

}    # ----------  end of function usage  ----------


#-----------------------------------------------------------------------
#  Handle command line arguments
#-----------------------------------------------------------------------

while getopts ":hvm:t:" opt
do
	case $opt in

	h|help     )  usage; exit 0   ;;

	v|version  )  echo "$0 -- version $__script_version"; exit 0   ;;

	m|media    )  media_url=$OPTARG   ;;

	t|time     )  human_time=$OPTARG   ;;

	* )  echo -e "\n  Option does not exist : $OPTARG\n"
		usage; exit 1   ;;

	esac    # --- end of case ---
done
shift $(($OPTIND-1))


#-----------------------------------------------------------------------
#  Suspend the machine, and wake at the given time
#-----------------------------------------------------------------------

unix_time=$(date +%s -d "$human_time")
seconds=$(($unix_time - $(date +%s)))

if [ $? -ne 0 ]
then
	exit 1
fi

hours_minutes="$(($seconds / 3600)) hours and $((($seconds / 60) % 60)) minutes"

read -p "Set alarm for $hours_minutes from now? [y/n] " go

if [ "$go" == n ]
then
	exit 0
fi

sudo rtcwake -m mem -t $unix_time > /dev/null
sleep 30 # give time to restore network connectivity


#-----------------------------------------------------------------------
#  Set the volume and play our media
#-----------------------------------------------------------------------

saved_volume=$(ponymix get-volume)

gradual &
mpv --really-quiet $media_url > /dev/null &


#-----------------------------------------------------------------------
#  If mpv fails, use our fallback
#-----------------------------------------------------------------------

got_input=142

while true; do
	if read -t 1; then
		got_input=$?
		pkill --ns $$ mpv > /dev/null
		break
	elif ! pgrep --ns $$ mpv > /dev/null; then
		break
	fi
done

if [ $got_input -ne 0 ]
then
	gradual &
	fallback
fi


ponymix set-volume $saved_volume > /dev/null

echo "Good Morning! ;)"

Very nice