#!/usr/bin/env sh

## sfx-synth v0.3
## produce system noises via PC speaker or soundcard fallback
## requires beep and sox for fallback synth noises
## usage: sfx-synth [named-sound]

# emulates shrill piezo PC speaker beeps inside a metal case
wav='sawtooth'
piezo='highpass 800 lowpass 4000 equalizer 2000 0.8q +4'

[ $# -eq 1 ] || {
	egrep '^##' < "$0" | sed -E 's/^## +//g'
	printf 'available sounds:'
	egrep -o '[a-zA-Z |]+)' < "$0" | tr '|)' ' ' \
		| sed -E 's/(\w+) (\w+)/\t\1 \(\2\)/g'
	exit 1
}

case "$1" in
	bell|bel)
		laptop-detect \
			&& play -qn synth 0.09 $wav 900 $piezo fade log 0 0.5 0.495 trim 0 0.05 vol 0.5 \
			|| beep -f 720 -l 90;;
	attention|attn)
		laptop-detect \
			&& play -qn synth 1 $wav 760 $piezo fade log 0 0.5 0.495 trim 0 0.2 repeat 1 vol 0.7 \
			|| beep -f 720 -r 2 -d 20 -l 90;;
	question|prompt)
		laptop-detect \
			&& play -qn synth 0.2 $wav 1047 $piezo fade log 0 0.2 0.1 vol 0.5 : synth 1 $wav 262 fade log 0 0.5 0.495 trim 0 0.2 vol 0.5 \
			|| beep -f 1047 -l 200 -n -f 262 -l 100;;
	keypress|btn)
		laptop-detect \
			&& play -qn synth 0.2 $wav 1862 $piezo fade log 0 0.05 0.04 vol 0.5 \
			|| beep -f 262 -l 20;;
esac &