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#!/bin/sh
default_sink_name()
{
pactl stat | sed -ne 's/^Default Sink: //p'
}
die()
{
printf 'Error: %s\n' "$1" >&2
exit 1
}
sink=$(default_sink_name) || die "could not determine default sink"
set_volume() # uses $sink
{
pactl set-sink-volume "$sink" "$1"%
}
show_volume_line() # uses $sink
{
local want_next=
pactl list sinks | while read line; do
case "$line" in
"Name: $sink") want_next=1 ;;
'Name: '*) want_next= ;;
'Volume: '*)
[ "$want_next" ] || continue
echo "$line"
break
;;
esac
done
}
show_volume_number() # uses $sink
{
set -- $(show_volume_line)
local total=0 num=0 p
for p; do
case "$p" in
*%)
total=$((total + ${p%%%}))
num=$((num + 1))
;;
esac
done
if [ "$num" -gt 0 ]; then
echo $(( total / num ))
fi
}
case "$1" in
[0-9]*) set_volume "$1" ;;
[-+*/][0-9]*) set_volume $(( $(show_volume_number) $1 )) ;;
'') show_volume_number ;;
*) die 'usage' ;;
esac
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